[PATCH v6 1/2] usb: typec: USB Type-C Port Manager (tcpm)
Guenter Roeck
linux at roeck-us.net
Thu Apr 27 01:15:08 UTC 2017
On Wed, Apr 26, 2017 at 03:26:11PM -0700, Guenter Roeck wrote:
> From: Guenter Roeck <groeck at chromium.org>
>
> This driver implements the USB Type-C Power Delivery state machine
> for both source and sink ports. Alternate mode support is not
> fully implemented.
>
> The driver attaches to the USB Type-C class code implemented in
> the following patches.
>
> usb: typec: add driver for Intel Whiskey Cove PMIC USB Type-C PHY
> usb: USB Type-C connector class
>
> This driver only implements the state machine. Lower level drivers are
> responsible for
> - Reporting VBUS status and activating VBUS
> - Setting CC lines and providing CC line status
> - Setting line polarity
> - Activating and deactivating VCONN
> - Setting the current limit
> - Activating and deactivating PD message transfers
> - Sending and receiving PD messages
>
> The driver provides both a functional API as well as callbacks for
> lower level drivers.
>
> Signed-off-by: Guenter Roeck <groeck at chromium.org>
> Signed-off-by: Guenter Roeck <linux at roeck-us.net>
Of course this has missing dependencies and won't compile if CONFIG_DEBUG_FS
is not enabled. Greg, should I send v7 or follow-up patches ?
Thanks,
Guenter
> ---
> v6:
> - Move driver and include files to -staging
> - Remove unused defines from include files
> - Fix compile error seen when building on top of -next (include file change)
> - Fix VDO log message
> - Various endianness fixes
> - Separate PDO logging into separate function
> - Replace "SBZ" in include files with "Reserved; Shall be set to zero"
> - Fix VDO_AMA macro
> - Move pd_mode_data from pd_vdo.h to tcpm.c
> - Add TODO file
>
> v5:
> - Adjust to infrastructure API changes
> - Minor API change to low level driver
> [set_pd_header -> set_roles]
> - Set default state depending on preferred role
> - Improve Try.SRC and Try.SNK implementation
> - Do not report stale identity information to infrastructure
> - Fix crash seen if a SVD message was received while disconnected
> - Improve accessory handling
> - If a role change is requested and the partner does not support PD,
> request a port reset
> - Set state to SRC_READY after PD_N_CAPS_COUNT if the partner does not
> respond to capabilities messages
> - Update PD_T_SEND_SOURCE_CAP to improve compatibility with slow partners
> - Coding style fixes
>
> v4:
> - Source and sink capabilities can now change on the fly
> - Introduced several new macros to identify CC states
> - Determine RP value to set based on maximum current supported
> by a port configured as source
> - Support for DRP toggling implemented in hardware (by Type-C port controller)
> - Added MODULE_ macros
>
> v3:
> - Improve TCPM state machine resiliency if there are spurious CC line changes
> while the state machine is in a transient change (waiting for a timeout)
> - Update current limit after CC voltage level changes on a port which is not
> PD capable.
>
> v2:
> - Only update polarity if setting it was successful
> If setting the CC line polarity in the driver was not successful,
> don't update the internal polarity state.
> - All PD messages are little endian; convert to and from CPU endianness.
> - Avoid comparisons against NULL.
> - Use u8/u16/u32 instead of uint8_t/uint16_t/uint32_t consistently.
> - Callbacks into tcpm need to be lockless to avoid timing problems
> in low level drivers.
> - Simplify callbacks; tcpm can request the current state of cc/vbus
> when it is ready to use it.
>
> drivers/staging/Kconfig | 2 +
> drivers/staging/Makefile | 2 +-
> drivers/staging/typec/Kconfig | 10 +
> drivers/staging/typec/Makefile | 1 +
> drivers/staging/typec/TODO | 12 +
> drivers/staging/typec/pd.h | 281 ++++
> drivers/staging/typec/pd_bdo.h | 31 +
> drivers/staging/typec/pd_vdo.h | 249 +++
> drivers/staging/typec/tcpm.c | 3464 ++++++++++++++++++++++++++++++++++++++++
> drivers/staging/typec/tcpm.h | 150 ++
> 10 files changed, 4201 insertions(+), 1 deletion(-)
> create mode 100644 drivers/staging/typec/Kconfig
> create mode 100644 drivers/staging/typec/Makefile
> create mode 100644 drivers/staging/typec/TODO
> create mode 100644 drivers/staging/typec/pd.h
> create mode 100644 drivers/staging/typec/pd_bdo.h
> create mode 100644 drivers/staging/typec/pd_vdo.h
> create mode 100644 drivers/staging/typec/tcpm.c
> create mode 100644 drivers/staging/typec/tcpm.h
>
> diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
> index 65440f675033..af81544091e3 100644
> --- a/drivers/staging/Kconfig
> +++ b/drivers/staging/Kconfig
> @@ -104,4 +104,6 @@ source "drivers/staging/greybus/Kconfig"
>
> source "drivers/staging/vc04_services/Kconfig"
>
> +source "drivers/staging/typec/Kconfig"
> +
> endif # STAGING
> diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
> index 13ae7f899b21..077285c648e6 100644
> --- a/drivers/staging/Makefile
> +++ b/drivers/staging/Makefile
> @@ -41,4 +41,4 @@ obj-$(CONFIG_MOST) += most/
> obj-$(CONFIG_KS7010) += ks7010/
> obj-$(CONFIG_GREYBUS) += greybus/
> obj-$(CONFIG_BCM2835_VCHIQ) += vc04_services/
> -
> +obj-y += typec/
> diff --git a/drivers/staging/typec/Kconfig b/drivers/staging/typec/Kconfig
> new file mode 100644
> index 000000000000..1aa0ffb856a4
> --- /dev/null
> +++ b/drivers/staging/typec/Kconfig
> @@ -0,0 +1,10 @@
> +menu "USB Power Delivery and Type-C drivers"
> +
> +config TYPEC_TCPM
> + tristate "USB Type-C Port Controller Manager"
> + select TYPEC
> + help
> + The Type-C Port Controller Manager provides a USB PD and USB Type-C
> + state machine for use with Type-C Port Controllers.
> +
> +endmenu
> diff --git a/drivers/staging/typec/Makefile b/drivers/staging/typec/Makefile
> new file mode 100644
> index 000000000000..4d82c2480fc2
> --- /dev/null
> +++ b/drivers/staging/typec/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_TYPEC_TCPM) += tcpm.o
> diff --git a/drivers/staging/typec/TODO b/drivers/staging/typec/TODO
> new file mode 100644
> index 000000000000..a8db476704f0
> --- /dev/null
> +++ b/drivers/staging/typec/TODO
> @@ -0,0 +1,12 @@
> +tcpm:
> +- Add documentation (at the very least for the API to low level drivers)
> +- Split PD code into separate file
> +- Check if it makes sense to use tracepoints instead of debugfs for debug logs
> +- Implement Alternate Mode handling
> +- Address "#if 0" code if not addressed with the above
> +- Validate all comments marked with "XXX"; either address or remove comments
> +- Add support for USB PD 3.0. While not mandatory, at least fast role swap
> + as well as authentication support would be very desirable.
> +
> +Please send patches to Guenter Roeck <linux at roeck-us.net> and copy
> +Heikki Krogerus <heikki.krogerus at linux.intel.com>.
> diff --git a/drivers/staging/typec/pd.h b/drivers/staging/typec/pd.h
> new file mode 100644
> index 000000000000..8d97bdb95f23
> --- /dev/null
> +++ b/drivers/staging/typec/pd.h
> @@ -0,0 +1,281 @@
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __LINUX_USB_PD_H
> +#define __LINUX_USB_PD_H
> +
> +#include <linux/types.h>
> +#include <linux/usb/typec.h>
> +
> +/* USB PD Messages */
> +enum pd_ctrl_msg_type {
> + /* 0 Reserved */
> + PD_CTRL_GOOD_CRC = 1,
> + PD_CTRL_GOTO_MIN = 2,
> + PD_CTRL_ACCEPT = 3,
> + PD_CTRL_REJECT = 4,
> + PD_CTRL_PING = 5,
> + PD_CTRL_PS_RDY = 6,
> + PD_CTRL_GET_SOURCE_CAP = 7,
> + PD_CTRL_GET_SINK_CAP = 8,
> + PD_CTRL_DR_SWAP = 9,
> + PD_CTRL_PR_SWAP = 10,
> + PD_CTRL_VCONN_SWAP = 11,
> + PD_CTRL_WAIT = 12,
> + PD_CTRL_SOFT_RESET = 13,
> + /* 14-15 Reserved */
> +};
> +
> +enum pd_data_msg_type {
> + /* 0 Reserved */
> + PD_DATA_SOURCE_CAP = 1,
> + PD_DATA_REQUEST = 2,
> + PD_DATA_BIST = 3,
> + PD_DATA_SINK_CAP = 4,
> + /* 5-14 Reserved */
> + PD_DATA_VENDOR_DEF = 15,
> +};
> +
> +#define PD_REV10 0x0
> +#define PD_REV20 0x1
> +
> +#define PD_HEADER_CNT_SHIFT 12
> +#define PD_HEADER_CNT_MASK 0x7
> +#define PD_HEADER_ID_SHIFT 9
> +#define PD_HEADER_ID_MASK 0x7
> +#define PD_HEADER_PWR_ROLE BIT(8)
> +#define PD_HEADER_REV_SHIFT 6
> +#define PD_HEADER_REV_MASK 0x3
> +#define PD_HEADER_DATA_ROLE BIT(5)
> +#define PD_HEADER_TYPE_SHIFT 0
> +#define PD_HEADER_TYPE_MASK 0xf
> +
> +#define PD_HEADER(type, pwr, data, id, cnt) \
> + ((((type) & PD_HEADER_TYPE_MASK) << PD_HEADER_TYPE_SHIFT) | \
> + ((pwr) == TYPEC_SOURCE ? PD_HEADER_PWR_ROLE : 0) | \
> + ((data) == TYPEC_HOST ? PD_HEADER_DATA_ROLE : 0) | \
> + (PD_REV20 << PD_HEADER_REV_SHIFT) | \
> + (((id) & PD_HEADER_ID_MASK) << PD_HEADER_ID_SHIFT) | \
> + (((cnt) & PD_HEADER_CNT_MASK) << PD_HEADER_CNT_SHIFT))
> +
> +#define PD_HEADER_LE(type, pwr, data, id, cnt) \
> + cpu_to_le16(PD_HEADER((type), (pwr), (data), (id), (cnt)))
> +
> +static inline unsigned int pd_header_cnt(u16 header)
> +{
> + return (header >> PD_HEADER_CNT_SHIFT) & PD_HEADER_CNT_MASK;
> +}
> +
> +static inline unsigned int pd_header_cnt_le(__le16 header)
> +{
> + return pd_header_cnt(le16_to_cpu(header));
> +}
> +
> +static inline unsigned int pd_header_type(u16 header)
> +{
> + return (header >> PD_HEADER_TYPE_SHIFT) & PD_HEADER_TYPE_MASK;
> +}
> +
> +static inline unsigned int pd_header_type_le(__le16 header)
> +{
> + return pd_header_type(le16_to_cpu(header));
> +}
> +
> +#define PD_MAX_PAYLOAD 7
> +
> +struct pd_message {
> + __le16 header;
> + __le32 payload[PD_MAX_PAYLOAD];
> +} __packed;
> +
> +/* PDO: Power Data Object */
> +#define PDO_MAX_OBJECTS 7
> +
> +enum pd_pdo_type {
> + PDO_TYPE_FIXED = 0,
> + PDO_TYPE_BATT = 1,
> + PDO_TYPE_VAR = 2,
> +};
> +
> +#define PDO_TYPE_SHIFT 30
> +#define PDO_TYPE_MASK 0x3
> +
> +#define PDO_TYPE(t) ((t) << PDO_TYPE_SHIFT)
> +
> +#define PDO_VOLT_MASK 0x3ff
> +#define PDO_CURR_MASK 0x3ff
> +#define PDO_PWR_MASK 0x3ff
> +
> +#define PDO_FIXED_DUAL_ROLE BIT(29) /* Power role swap supported */
> +#define PDO_FIXED_SUSPEND BIT(28) /* USB Suspend supported (Source) */
> +#define PDO_FIXED_HIGHER_CAP BIT(28) /* Requires more than vSafe5V (Sink) */
> +#define PDO_FIXED_EXTPOWER BIT(27) /* Externally powered */
> +#define PDO_FIXED_USB_COMM BIT(26) /* USB communications capable */
> +#define PDO_FIXED_DATA_SWAP BIT(25) /* Data role swap supported */
> +#define PDO_FIXED_VOLT_SHIFT 10 /* 50mV units */
> +#define PDO_FIXED_CURR_SHIFT 0 /* 10mA units */
> +
> +#define PDO_FIXED_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_FIXED_VOLT_SHIFT)
> +#define PDO_FIXED_CURR(ma) ((((ma) / 10) & PDO_CURR_MASK) << PDO_FIXED_CURR_SHIFT)
> +
> +#define PDO_FIXED(mv, ma, flags) \
> + (PDO_TYPE(PDO_TYPE_FIXED) | (flags) | \
> + PDO_FIXED_VOLT(mv) | PDO_FIXED_CURR(ma))
> +
> +#define PDO_BATT_MAX_VOLT_SHIFT 20 /* 50mV units */
> +#define PDO_BATT_MIN_VOLT_SHIFT 10 /* 50mV units */
> +#define PDO_BATT_MAX_PWR_SHIFT 0 /* 250mW units */
> +
> +#define PDO_BATT_MIN_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_BATT_MIN_VOLT_SHIFT)
> +#define PDO_BATT_MAX_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_BATT_MAX_VOLT_SHIFT)
> +#define PDO_BATT_MAX_POWER(mw) ((((mw) / 250) & PDO_PWR_MASK) << PDO_BATT_MAX_PWR_SHIFT)
> +
> +#define PDO_BATT(min_mv, max_mv, max_mw) \
> + (PDO_TYPE(PDO_TYPE_BATT) | PDO_BATT_MIN_VOLT(min_mv) | \
> + PDO_BATT_MAX_VOLT(max_mv) | PDO_BATT_MAX_POWER(max_mw))
> +
> +#define PDO_VAR_MAX_VOLT_SHIFT 20 /* 50mV units */
> +#define PDO_VAR_MIN_VOLT_SHIFT 10 /* 50mV units */
> +#define PDO_VAR_MAX_CURR_SHIFT 0 /* 10mA units */
> +
> +#define PDO_VAR_MIN_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_VAR_MIN_VOLT_SHIFT)
> +#define PDO_VAR_MAX_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_VAR_MAX_VOLT_SHIFT)
> +#define PDO_VAR_MAX_CURR(ma) ((((ma) / 10) & PDO_CURR_MASK) << PDO_VAR_MAX_CURR_SHIFT)
> +
> +#define PDO_VAR(min_mv, max_mv, max_ma) \
> + (PDO_TYPE(PDO_TYPE_VAR) | PDO_VAR_MIN_VOLT(min_mv) | \
> + PDO_VAR_MAX_VOLT(max_mv) | PDO_VAR_MAX_CURR(max_ma))
> +
> +static inline enum pd_pdo_type pdo_type(u32 pdo)
> +{
> + return (pdo >> PDO_TYPE_SHIFT) & PDO_TYPE_MASK;
> +}
> +
> +static inline unsigned int pdo_fixed_voltage(u32 pdo)
> +{
> + return ((pdo >> PDO_FIXED_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;
> +}
> +
> +static inline unsigned int pdo_min_voltage(u32 pdo)
> +{
> + return ((pdo >> PDO_VAR_MIN_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;
> +}
> +
> +static inline unsigned int pdo_max_voltage(u32 pdo)
> +{
> + return ((pdo >> PDO_VAR_MAX_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;
> +}
> +
> +static inline unsigned int pdo_max_current(u32 pdo)
> +{
> + return ((pdo >> PDO_VAR_MAX_CURR_SHIFT) & PDO_CURR_MASK) * 10;
> +}
> +
> +static inline unsigned int pdo_max_power(u32 pdo)
> +{
> + return ((pdo >> PDO_BATT_MAX_PWR_SHIFT) & PDO_PWR_MASK) * 250;
> +}
> +
> +/* RDO: Request Data Object */
> +#define RDO_OBJ_POS_SHIFT 28
> +#define RDO_OBJ_POS_MASK 0x7
> +#define RDO_GIVE_BACK BIT(27) /* Supports reduced operating current */
> +#define RDO_CAP_MISMATCH BIT(26) /* Not satisfied by source caps */
> +#define RDO_USB_COMM BIT(25) /* USB communications capable */
> +#define RDO_NO_SUSPEND BIT(24) /* USB Suspend not supported */
> +
> +#define RDO_PWR_MASK 0x3ff
> +#define RDO_CURR_MASK 0x3ff
> +
> +#define RDO_FIXED_OP_CURR_SHIFT 10
> +#define RDO_FIXED_MAX_CURR_SHIFT 0
> +
> +#define RDO_OBJ(idx) (((idx) & RDO_OBJ_POS_MASK) << RDO_OBJ_POS_SHIFT)
> +
> +#define PDO_FIXED_OP_CURR(ma) ((((ma) / 10) & RDO_CURR_MASK) << RDO_FIXED_OP_CURR_SHIFT)
> +#define PDO_FIXED_MAX_CURR(ma) ((((ma) / 10) & RDO_CURR_MASK) << RDO_FIXED_MAX_CURR_SHIFT)
> +
> +#define RDO_FIXED(idx, op_ma, max_ma, flags) \
> + (RDO_OBJ(idx) | (flags) | \
> + PDO_FIXED_OP_CURR(op_ma) | PDO_FIXED_MAX_CURR(max_ma))
> +
> +#define RDO_BATT_OP_PWR_SHIFT 10 /* 250mW units */
> +#define RDO_BATT_MAX_PWR_SHIFT 0 /* 250mW units */
> +
> +#define RDO_BATT_OP_PWR(mw) ((((mw) / 250) & RDO_PWR_MASK) << RDO_BATT_OP_PWR_SHIFT)
> +#define RDO_BATT_MAX_PWR(mw) ((((mw) / 250) & RDO_PWR_MASK) << RDO_BATT_MAX_PWR_SHIFT)
> +
> +#define RDO_BATT(idx, op_mw, max_mw, flags) \
> + (RDO_OBJ(idx) | (flags) | \
> + RDO_BATT_OP_PWR(op_mw) | RDO_BATT_MAX_PWR(max_mw))
> +
> +static inline unsigned int rdo_index(u32 rdo)
> +{
> + return (rdo >> RDO_OBJ_POS_SHIFT) & RDO_OBJ_POS_MASK;
> +}
> +
> +static inline unsigned int rdo_op_current(u32 rdo)
> +{
> + return ((rdo >> RDO_FIXED_OP_CURR_SHIFT) & RDO_CURR_MASK) * 10;
> +}
> +
> +static inline unsigned int rdo_max_current(u32 rdo)
> +{
> + return ((rdo >> RDO_FIXED_MAX_CURR_SHIFT) &
> + RDO_CURR_MASK) * 10;
> +}
> +
> +static inline unsigned int rdo_op_power(u32 rdo)
> +{
> + return ((rdo >> RDO_BATT_OP_PWR_SHIFT) & RDO_PWR_MASK) * 250;
> +}
> +
> +static inline unsigned int rdo_max_power(u32 rdo)
> +{
> + return ((rdo >> RDO_BATT_MAX_PWR_SHIFT) & RDO_PWR_MASK) * 250;
> +}
> +
> +/* USB PD timers and counters */
> +#define PD_T_NO_RESPONSE 5000 /* 4.5 - 5.5 seconds */
> +#define PD_T_DB_DETECT 10000 /* 10 - 15 seconds */
> +#define PD_T_SEND_SOURCE_CAP 150 /* 100 - 200 ms */
> +#define PD_T_SENDER_RESPONSE 60 /* 24 - 30 ms, relaxed */
> +#define PD_T_SOURCE_ACTIVITY 45
> +#define PD_T_SINK_ACTIVITY 135
> +#define PD_T_SINK_WAIT_CAP 240
> +#define PD_T_PS_TRANSITION 500
> +#define PD_T_SRC_TRANSITION 35
> +#define PD_T_DRP_SNK 40
> +#define PD_T_DRP_SRC 30
> +#define PD_T_PS_SOURCE_OFF 920
> +#define PD_T_PS_SOURCE_ON 480
> +#define PD_T_PS_HARD_RESET 30
> +#define PD_T_SRC_RECOVER 760
> +#define PD_T_SRC_RECOVER_MAX 1000
> +#define PD_T_SRC_TURN_ON 275
> +#define PD_T_SAFE_0V 650
> +#define PD_T_VCONN_SOURCE_ON 100
> +#define PD_T_SINK_REQUEST 100 /* 100 ms minimum */
> +#define PD_T_ERROR_RECOVERY 100 /* minimum 25 is insufficient */
> +
> +#define PD_T_DRP_TRY 100 /* 75 - 150 ms */
> +#define PD_T_DRP_TRYWAIT 600 /* 400 - 800 ms */
> +
> +#define PD_T_CC_DEBOUNCE 200 /* 100 - 200 ms */
> +#define PD_T_PD_DEBOUNCE 20 /* 10 - 20 ms */
> +
> +#define PD_N_CAPS_COUNT (PD_T_NO_RESPONSE / PD_T_SEND_SOURCE_CAP)
> +#define PD_N_HARD_RESET_COUNT 2
> +
> +#endif /* __LINUX_USB_PD_H */
> diff --git a/drivers/staging/typec/pd_bdo.h b/drivers/staging/typec/pd_bdo.h
> new file mode 100644
> index 000000000000..90b94d9fea5d
> --- /dev/null
> +++ b/drivers/staging/typec/pd_bdo.h
> @@ -0,0 +1,31 @@
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __LINUX_USB_PD_BDO_H
> +#define __LINUX_USB_PD_BDO_H
> +
> +/* BDO : BIST Data Object */
> +#define BDO_MODE_RECV (0 << 28)
> +#define BDO_MODE_TRANSMIT (1 << 28)
> +#define BDO_MODE_COUNTERS (2 << 28)
> +#define BDO_MODE_CARRIER0 (3 << 28)
> +#define BDO_MODE_CARRIER1 (4 << 28)
> +#define BDO_MODE_CARRIER2 (5 << 28)
> +#define BDO_MODE_CARRIER3 (6 << 28)
> +#define BDO_MODE_EYE (7 << 28)
> +#define BDO_MODE_TESTDATA (8 << 28)
> +
> +#define BDO_MODE_MASK(mode) ((mode) & 0xf0000000)
> +
> +#endif
> diff --git a/drivers/staging/typec/pd_vdo.h b/drivers/staging/typec/pd_vdo.h
> new file mode 100644
> index 000000000000..dba172e0e0d1
> --- /dev/null
> +++ b/drivers/staging/typec/pd_vdo.h
> @@ -0,0 +1,249 @@
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __LINUX_USB_PD_VDO_H
> +#define __LINUX_USB_PD_VDO_H
> +
> +#include "pd.h"
> +
> +/*
> + * VDO : Vendor Defined Message Object
> + * VDM object is minimum of VDM header + 6 additional data objects.
> + */
> +
> +/*
> + * VDM header
> + * ----------
> + * <31:16> :: SVID
> + * <15> :: VDM type ( 1b == structured, 0b == unstructured )
> + * <14:13> :: Structured VDM version (can only be 00 == 1.0 currently)
> + * <12:11> :: reserved
> + * <10:8> :: object position (1-7 valid ... used for enter/exit mode only)
> + * <7:6> :: command type (SVDM only?)
> + * <5> :: reserved (SVDM), command type (UVDM)
> + * <4:0> :: command
> + */
> +#define VDO_MAX_SIZE 7
> +#define VDO(vid, type, custom) \
> + (((vid) << 16) | \
> + ((type) << 15) | \
> + ((custom) & 0x7FFF))
> +
> +#define VDO_SVDM_TYPE (1 << 15)
> +#define VDO_SVDM_VERS(x) ((x) << 13)
> +#define VDO_OPOS(x) ((x) << 8)
> +#define VDO_CMDT(x) ((x) << 6)
> +#define VDO_OPOS_MASK VDO_OPOS(0x7)
> +#define VDO_CMDT_MASK VDO_CMDT(0x3)
> +
> +#define CMDT_INIT 0
> +#define CMDT_RSP_ACK 1
> +#define CMDT_RSP_NAK 2
> +#define CMDT_RSP_BUSY 3
> +
> +/* reserved for SVDM ... for Google UVDM */
> +#define VDO_SRC_INITIATOR (0 << 5)
> +#define VDO_SRC_RESPONDER (1 << 5)
> +
> +#define CMD_DISCOVER_IDENT 1
> +#define CMD_DISCOVER_SVID 2
> +#define CMD_DISCOVER_MODES 3
> +#define CMD_ENTER_MODE 4
> +#define CMD_EXIT_MODE 5
> +#define CMD_ATTENTION 6
> +
> +#define VDO_CMD_VENDOR(x) (((10 + (x)) & 0x1f))
> +
> +/* ChromeOS specific commands */
> +#define VDO_CMD_VERSION VDO_CMD_VENDOR(0)
> +#define VDO_CMD_SEND_INFO VDO_CMD_VENDOR(1)
> +#define VDO_CMD_READ_INFO VDO_CMD_VENDOR(2)
> +#define VDO_CMD_REBOOT VDO_CMD_VENDOR(5)
> +#define VDO_CMD_FLASH_ERASE VDO_CMD_VENDOR(6)
> +#define VDO_CMD_FLASH_WRITE VDO_CMD_VENDOR(7)
> +#define VDO_CMD_ERASE_SIG VDO_CMD_VENDOR(8)
> +#define VDO_CMD_PING_ENABLE VDO_CMD_VENDOR(10)
> +#define VDO_CMD_CURRENT VDO_CMD_VENDOR(11)
> +#define VDO_CMD_FLIP VDO_CMD_VENDOR(12)
> +#define VDO_CMD_GET_LOG VDO_CMD_VENDOR(13)
> +#define VDO_CMD_CCD_EN VDO_CMD_VENDOR(14)
> +
> +#define PD_VDO_VID(vdo) ((vdo) >> 16)
> +#define PD_VDO_SVDM(vdo) (((vdo) >> 15) & 1)
> +#define PD_VDO_OPOS(vdo) (((vdo) >> 8) & 0x7)
> +#define PD_VDO_CMD(vdo) ((vdo) & 0x1f)
> +#define PD_VDO_CMDT(vdo) (((vdo) >> 6) & 0x3)
> +
> +/*
> + * SVDM Identity request -> response
> + *
> + * Request is simply properly formatted SVDM header
> + *
> + * Response is 4 data objects:
> + * [0] :: SVDM header
> + * [1] :: Identitiy header
> + * [2] :: Cert Stat VDO
> + * [3] :: (Product | Cable) VDO
> + * [4] :: AMA VDO
> + *
> + */
> +#define VDO_INDEX_HDR 0
> +#define VDO_INDEX_IDH 1
> +#define VDO_INDEX_CSTAT 2
> +#define VDO_INDEX_CABLE 3
> +#define VDO_INDEX_PRODUCT 3
> +#define VDO_INDEX_AMA 4
> +
> +/*
> + * SVDM Identity Header
> + * --------------------
> + * <31> :: data capable as a USB host
> + * <30> :: data capable as a USB device
> + * <29:27> :: product type
> + * <26> :: modal operation supported (1b == yes)
> + * <25:16> :: Reserved, Shall be set to zero
> + * <15:0> :: USB-IF assigned VID for this cable vendor
> + */
> +#define IDH_PTYPE_UNDEF 0
> +#define IDH_PTYPE_HUB 1
> +#define IDH_PTYPE_PERIPH 2
> +#define IDH_PTYPE_PCABLE 3
> +#define IDH_PTYPE_ACABLE 4
> +#define IDH_PTYPE_AMA 5
> +
> +#define VDO_IDH(usbh, usbd, ptype, is_modal, vid) \
> + ((usbh) << 31 | (usbd) << 30 | ((ptype) & 0x7) << 27 \
> + | (is_modal) << 26 | ((vid) & 0xffff))
> +
> +#define PD_IDH_PTYPE(vdo) (((vdo) >> 27) & 0x7)
> +#define PD_IDH_VID(vdo) ((vdo) & 0xffff)
> +#define PD_IDH_MODAL_SUPP(vdo) ((vdo) & (1 << 26))
> +
> +/*
> + * Cert Stat VDO
> + * -------------
> + * <31:0> : USB-IF assigned XID for this cable
> + */
> +#define PD_CSTAT_XID(vdo) (vdo)
> +
> +/*
> + * Product VDO
> + * -----------
> + * <31:16> : USB Product ID
> + * <15:0> : USB bcdDevice
> + */
> +#define VDO_PRODUCT(pid, bcd) (((pid) & 0xffff) << 16 | ((bcd) & 0xffff))
> +#define PD_PRODUCT_PID(vdo) (((vdo) >> 16) & 0xffff)
> +
> +/*
> + * Cable VDO
> + * ---------
> + * <31:28> :: Cable HW version
> + * <27:24> :: Cable FW version
> + * <23:20> :: Reserved, Shall be set to zero
> + * <19:18> :: type-C to Type-A/B/C (00b == A, 01 == B, 10 == C)
> + * <17> :: Type-C to Plug/Receptacle (0b == plug, 1b == receptacle)
> + * <16:13> :: cable latency (0001 == <10ns(~1m length))
> + * <12:11> :: cable termination type (11b == both ends active VCONN req)
> + * <10> :: SSTX1 Directionality support (0b == fixed, 1b == cfgable)
> + * <9> :: SSTX2 Directionality support
> + * <8> :: SSRX1 Directionality support
> + * <7> :: SSRX2 Directionality support
> + * <6:5> :: Vbus current handling capability
> + * <4> :: Vbus through cable (0b == no, 1b == yes)
> + * <3> :: SOP" controller present? (0b == no, 1b == yes)
> + * <2:0> :: USB SS Signaling support
> + */
> +#define CABLE_ATYPE 0
> +#define CABLE_BTYPE 1
> +#define CABLE_CTYPE 2
> +#define CABLE_PLUG 0
> +#define CABLE_RECEPTACLE 1
> +#define CABLE_CURR_1A5 0
> +#define CABLE_CURR_3A 1
> +#define CABLE_CURR_5A 2
> +#define CABLE_USBSS_U2_ONLY 0
> +#define CABLE_USBSS_U31_GEN1 1
> +#define CABLE_USBSS_U31_GEN2 2
> +#define VDO_CABLE(hw, fw, cbl, gdr, lat, term, tx1d, tx2d, rx1d, rx2d, cur,\
> + vps, sopp, usbss) \
> + (((hw) & 0x7) << 28 | ((fw) & 0x7) << 24 | ((cbl) & 0x3) << 18 \
> + | (gdr) << 17 | ((lat) & 0x7) << 13 | ((term) & 0x3) << 11 \
> + | (tx1d) << 10 | (tx2d) << 9 | (rx1d) << 8 | (rx2d) << 7 \
> + | ((cur) & 0x3) << 5 | (vps) << 4 | (sopp) << 3 \
> + | ((usbss) & 0x7))
> +
> +/*
> + * AMA VDO
> + * ---------
> + * <31:28> :: Cable HW version
> + * <27:24> :: Cable FW version
> + * <23:12> :: Reserved, Shall be set to zero
> + * <11> :: SSTX1 Directionality support (0b == fixed, 1b == cfgable)
> + * <10> :: SSTX2 Directionality support
> + * <9> :: SSRX1 Directionality support
> + * <8> :: SSRX2 Directionality support
> + * <7:5> :: Vconn power
> + * <4> :: Vconn power required
> + * <3> :: Vbus power required
> + * <2:0> :: USB SS Signaling support
> + */
> +#define VDO_AMA(hw, fw, tx1d, tx2d, rx1d, rx2d, vcpwr, vcr, vbr, usbss) \
> + (((hw) & 0x7) << 28 | ((fw) & 0x7) << 24 \
> + | (tx1d) << 11 | (tx2d) << 10 | (rx1d) << 9 | (rx2d) << 8 \
> + | ((vcpwr) & 0x7) << 5 | (vcr) << 4 | (vbr) << 3 \
> + | ((usbss) & 0x7))
> +
> +#define PD_VDO_AMA_VCONN_REQ(vdo) (((vdo) >> 4) & 1)
> +#define PD_VDO_AMA_VBUS_REQ(vdo) (((vdo) >> 3) & 1)
> +
> +#define AMA_VCONN_PWR_1W 0
> +#define AMA_VCONN_PWR_1W5 1
> +#define AMA_VCONN_PWR_2W 2
> +#define AMA_VCONN_PWR_3W 3
> +#define AMA_VCONN_PWR_4W 4
> +#define AMA_VCONN_PWR_5W 5
> +#define AMA_VCONN_PWR_6W 6
> +#define AMA_USBSS_U2_ONLY 0
> +#define AMA_USBSS_U31_GEN1 1
> +#define AMA_USBSS_U31_GEN2 2
> +#define AMA_USBSS_BBONLY 3
> +
> +/*
> + * SVDM Discover SVIDs request -> response
> + *
> + * Request is properly formatted VDM Header with discover SVIDs command.
> + * Response is a set of SVIDs of all all supported SVIDs with all zero's to
> + * mark the end of SVIDs. If more than 12 SVIDs are supported command SHOULD be
> + * repeated.
> + */
> +#define VDO_SVID(svid0, svid1) (((svid0) & 0xffff) << 16 | ((svid1) & 0xffff))
> +#define PD_VDO_SVID_SVID0(vdo) ((vdo) >> 16)
> +#define PD_VDO_SVID_SVID1(vdo) ((vdo) & 0xffff)
> +
> +/* USB-IF SIDs */
> +#define USB_SID_PD 0xff00 /* power delivery */
> +#define USB_SID_DISPLAYPORT 0xff01
> +#define USB_SID_MHL 0xff02 /* Mobile High-Definition Link */
> +
> +/* VDM command timeouts (in ms) */
> +
> +#define PD_T_VDM_UNSTRUCTURED 500
> +#define PD_T_VDM_BUSY 100
> +#define PD_T_VDM_WAIT_MODE_E 100
> +#define PD_T_VDM_SNDR_RSP 30
> +#define PD_T_VDM_E_MODE 25
> +#define PD_T_VDM_RCVR_RSP 15
> +
> +#endif /* __LINUX_USB_PD_VDO_H */
> diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
> new file mode 100644
> index 000000000000..f40006eb42d4
> --- /dev/null
> +++ b/drivers/staging/typec/tcpm.c
> @@ -0,0 +1,3464 @@
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * USB Power Delivery protocol stack.
> + */
> +
> +#include <linux/completion.h>
> +#include <linux/debugfs.h>
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/proc_fs.h>
> +#include <linux/sched/clock.h>
> +#include <linux/seq_file.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/usb/typec.h>
> +#include <linux/workqueue.h>
> +
> +#include "pd.h"
> +#include "pd_vdo.h"
> +#include "pd_bdo.h"
> +#include "tcpm.h"
> +
> +#define FOREACH_STATE(S) \
> + S(INVALID_STATE), \
> + S(DRP_TOGGLING), \
> + S(SRC_UNATTACHED), \
> + S(SRC_ATTACH_WAIT), \
> + S(SRC_ATTACHED), \
> + S(SRC_STARTUP), \
> + S(SRC_SEND_CAPABILITIES), \
> + S(SRC_NEGOTIATE_CAPABILITIES), \
> + S(SRC_TRANSITION_SUPPLY), \
> + S(SRC_READY), \
> + S(SRC_WAIT_NEW_CAPABILITIES), \
> + \
> + S(SNK_UNATTACHED), \
> + S(SNK_ATTACH_WAIT), \
> + S(SNK_DEBOUNCED), \
> + S(SNK_ATTACHED), \
> + S(SNK_STARTUP), \
> + S(SNK_DISCOVERY), \
> + S(SNK_DISCOVERY_DEBOUNCE), \
> + S(SNK_DISCOVERY_DEBOUNCE_DONE), \
> + S(SNK_WAIT_CAPABILITIES), \
> + S(SNK_NEGOTIATE_CAPABILITIES), \
> + S(SNK_TRANSITION_SINK), \
> + S(SNK_TRANSITION_SINK_VBUS), \
> + S(SNK_READY), \
> + \
> + S(ACC_UNATTACHED), \
> + S(DEBUG_ACC_ATTACHED), \
> + S(AUDIO_ACC_ATTACHED), \
> + S(AUDIO_ACC_DEBOUNCE), \
> + \
> + S(HARD_RESET_SEND), \
> + S(HARD_RESET_START), \
> + S(SRC_HARD_RESET_VBUS_OFF), \
> + S(SRC_HARD_RESET_VBUS_ON), \
> + S(SNK_HARD_RESET_SINK_OFF), \
> + S(SNK_HARD_RESET_WAIT_VBUS), \
> + S(SNK_HARD_RESET_SINK_ON), \
> + \
> + S(SOFT_RESET), \
> + S(SOFT_RESET_SEND), \
> + \
> + S(DR_SWAP_ACCEPT), \
> + S(DR_SWAP_SEND), \
> + S(DR_SWAP_SEND_TIMEOUT), \
> + S(DR_SWAP_CANCEL), \
> + S(DR_SWAP_CHANGE_DR), \
> + \
> + S(PR_SWAP_ACCEPT), \
> + S(PR_SWAP_SEND), \
> + S(PR_SWAP_SEND_TIMEOUT), \
> + S(PR_SWAP_CANCEL), \
> + S(PR_SWAP_START), \
> + S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \
> + S(PR_SWAP_SRC_SNK_SOURCE_OFF), \
> + S(PR_SWAP_SRC_SNK_SINK_ON), \
> + S(PR_SWAP_SNK_SRC_SINK_OFF), \
> + S(PR_SWAP_SNK_SRC_SOURCE_ON), \
> + \
> + S(VCONN_SWAP_ACCEPT), \
> + S(VCONN_SWAP_SEND), \
> + S(VCONN_SWAP_SEND_TIMEOUT), \
> + S(VCONN_SWAP_CANCEL), \
> + S(VCONN_SWAP_START), \
> + S(VCONN_SWAP_WAIT_FOR_VCONN), \
> + S(VCONN_SWAP_TURN_ON_VCONN), \
> + S(VCONN_SWAP_TURN_OFF_VCONN), \
> + \
> + S(SNK_TRY), \
> + S(SNK_TRY_WAIT), \
> + S(SRC_TRYWAIT), \
> + S(SRC_TRYWAIT_UNATTACHED), \
> + \
> + S(SRC_TRY), \
> + S(SRC_TRY_DEBOUNCE), \
> + S(SNK_TRYWAIT), \
> + S(SNK_TRYWAIT_DEBOUNCE), \
> + S(SNK_TRYWAIT_VBUS), \
> + S(BIST_RX), \
> + \
> + S(ERROR_RECOVERY), \
> + S(ERROR_RECOVERY_WAIT_OFF)
> +
> +#define GENERATE_ENUM(e) e
> +#define GENERATE_STRING(s) #s
> +
> +enum tcpm_state {
> + FOREACH_STATE(GENERATE_ENUM)
> +};
> +
> +static const char * const tcpm_states[] = {
> + FOREACH_STATE(GENERATE_STRING)
> +};
> +
> +enum vdm_states {
> + VDM_STATE_ERR_BUSY = -3,
> + VDM_STATE_ERR_SEND = -2,
> + VDM_STATE_ERR_TMOUT = -1,
> + VDM_STATE_DONE = 0,
> + /* Anything >0 represents an active state */
> + VDM_STATE_READY = 1,
> + VDM_STATE_BUSY = 2,
> + VDM_STATE_WAIT_RSP_BUSY = 3,
> +};
> +
> +enum pd_msg_request {
> + PD_MSG_NONE = 0,
> + PD_MSG_CTRL_REJECT,
> + PD_MSG_CTRL_WAIT,
> + PD_MSG_DATA_SINK_CAP,
> + PD_MSG_DATA_SOURCE_CAP,
> +};
> +
> +/* Events from low level driver */
> +
> +#define TCPM_CC_EVENT BIT(0)
> +#define TCPM_VBUS_EVENT BIT(1)
> +#define TCPM_RESET_EVENT BIT(2)
> +
> +#define LOG_BUFFER_ENTRIES 1024
> +#define LOG_BUFFER_ENTRY_SIZE 128
> +
> +/* Alternate mode support */
> +
> +#define SVID_DISCOVERY_MAX 16
> +
> +struct pd_mode_data {
> + int svid_index; /* current SVID index */
> + int nsvids;
> + u16 svids[SVID_DISCOVERY_MAX];
> + int altmodes; /* number of alternate modes */
> + struct typec_altmode_desc altmode_desc[SVID_DISCOVERY_MAX];
> +};
> +
> +struct tcpm_port {
> + struct device *dev;
> +
> + struct mutex lock; /* tcpm state machine lock */
> + struct workqueue_struct *wq;
> +
> + struct typec_capability typec_caps;
> + struct typec_port *typec_port;
> +
> + struct tcpc_dev *tcpc;
> +
> + enum typec_role vconn_role;
> + enum typec_role pwr_role;
> + enum typec_data_role data_role;
> + enum typec_pwr_opmode pwr_opmode;
> +
> + struct usb_pd_identity partner_ident;
> + struct typec_partner_desc partner_desc;
> + struct typec_partner *partner;
> +
> + enum typec_cc_status cc_req;
> +
> + enum typec_cc_status cc1;
> + enum typec_cc_status cc2;
> + enum typec_cc_polarity polarity;
> +
> + bool attached;
> + bool connected;
> + bool vbus_present;
> + bool vbus_never_low;
> + bool vbus_source;
> + bool vbus_charge;
> +
> + bool send_discover;
> + bool op_vsafe5v;
> +
> + int try_role;
> + int try_snk_count;
> + int try_src_count;
> +
> + enum pd_msg_request queued_message;
> +
> + enum tcpm_state enter_state;
> + enum tcpm_state prev_state;
> + enum tcpm_state state;
> + enum tcpm_state delayed_state;
> + unsigned long delayed_runtime;
> + unsigned long delay_ms;
> +
> + spinlock_t pd_event_lock;
> + u32 pd_events;
> +
> + struct work_struct event_work;
> + struct delayed_work state_machine;
> + struct delayed_work vdm_state_machine;
> + bool state_machine_running;
> +
> + struct completion tx_complete;
> + enum tcpm_transmit_status tx_status;
> +
> + struct mutex swap_lock; /* swap command lock */
> + bool swap_pending;
> + struct completion swap_complete;
> + int swap_status;
> +
> + unsigned int message_id;
> + unsigned int caps_count;
> + unsigned int hard_reset_count;
> + bool pd_capable;
> + bool explicit_contract;
> +
> + /* Partner capabilities/requests */
> + u32 sink_request;
> + u32 source_caps[PDO_MAX_OBJECTS];
> + unsigned int nr_source_caps;
> + u32 sink_caps[PDO_MAX_OBJECTS];
> + unsigned int nr_sink_caps;
> +
> + /* Local capabilities */
> + u32 src_pdo[PDO_MAX_OBJECTS];
> + unsigned int nr_src_pdo;
> + u32 snk_pdo[PDO_MAX_OBJECTS];
> + unsigned int nr_snk_pdo;
> +
> + unsigned int max_snk_mv;
> + unsigned int max_snk_ma;
> + unsigned int max_snk_mw;
> + unsigned int operating_snk_mw;
> +
> + /* Requested current / voltage */
> + u32 current_limit;
> + u32 supply_voltage;
> +
> + u32 bist_request;
> +
> + /* PD state for Vendor Defined Messages */
> + enum vdm_states vdm_state;
> + u32 vdm_retries;
> + /* next Vendor Defined Message to send */
> + u32 vdo_data[VDO_MAX_SIZE];
> + u8 vdo_count;
> + /* VDO to retry if UFP responder replied busy */
> + u32 vdo_retry;
> +
> + /* Alternate mode data */
> +
> + struct pd_mode_data mode_data;
> + struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX];
> + struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX];
> +
> +#ifdef CONFIG_DEBUG_FS
> + struct dentry *dentry;
> + struct mutex logbuffer_lock; /* log buffer access lock */
> + int logbuffer_head;
> + int logbuffer_tail;
> + u8 *logbuffer[LOG_BUFFER_ENTRIES];
> +#endif
> +};
> +
> +struct pd_rx_event {
> + struct work_struct work;
> + struct tcpm_port *port;
> + struct pd_message msg;
> +};
> +
> +#define tcpm_cc_is_sink(cc) \
> + ((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
> + (cc) == TYPEC_CC_RP_3_0)
> +
> +#define tcpm_port_is_sink(port) \
> + ((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
> + (tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
> +
> +#define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
> +#define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
> +#define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
> +
> +#define tcpm_port_is_source(port) \
> + ((tcpm_cc_is_source((port)->cc1) && \
> + !tcpm_cc_is_source((port)->cc2)) || \
> + (tcpm_cc_is_source((port)->cc2) && \
> + !tcpm_cc_is_source((port)->cc1)))
> +
> +#define tcpm_port_is_debug(port) \
> + (tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
> +
> +#define tcpm_port_is_audio(port) \
> + (tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
> +
> +#define tcpm_port_is_audio_detached(port) \
> + ((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
> + (tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
> +
> +#define tcpm_try_snk(port) \
> + ((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK)
> +
> +#define tcpm_try_src(port) \
> + ((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE)
> +
> +static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
> +{
> + if (port->try_role == TYPEC_SINK)
> + return SNK_UNATTACHED;
> + else if (port->try_role == TYPEC_SOURCE)
> + return SRC_UNATTACHED;
> + else if (port->tcpc->config->default_role == TYPEC_SINK)
> + return SNK_UNATTACHED;
> + return SRC_UNATTACHED;
> +}
> +
> +static inline
> +struct tcpm_port *typec_cap_to_tcpm(const struct typec_capability *cap)
> +{
> + return container_of(cap, struct tcpm_port, typec_caps);
> +}
> +
> +static bool tcpm_port_is_disconnected(struct tcpm_port *port)
> +{
> + return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
> + port->cc2 == TYPEC_CC_OPEN) ||
> + (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
> + port->cc1 == TYPEC_CC_OPEN) ||
> + (port->polarity == TYPEC_POLARITY_CC2 &&
> + port->cc2 == TYPEC_CC_OPEN)));
> +}
> +
> +/*
> + * Logging
> + */
> +
> +#ifdef CONFIG_DEBUG_FS
> +
> +static bool tcpm_log_full(struct tcpm_port *port)
> +{
> + return port->logbuffer_tail ==
> + (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
> +}
> +
> +static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
> +{
> + char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
> + u64 ts_nsec = local_clock();
> + unsigned long rem_nsec;
> +
> + if (!port->logbuffer[port->logbuffer_head]) {
> + port->logbuffer[port->logbuffer_head] =
> + kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
> + if (!port->logbuffer[port->logbuffer_head])
> + return;
> + }
> +
> + vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
> +
> + mutex_lock(&port->logbuffer_lock);
> +
> + if (tcpm_log_full(port)) {
> + port->logbuffer_head = max(port->logbuffer_head - 1, 0);
> + strcpy(tmpbuffer, "overflow");
> + }
> +
> + if (port->logbuffer_head < 0 ||
> + port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
> + dev_warn(port->dev,
> + "Bad log buffer index %d\n", port->logbuffer_head);
> + goto abort;
> + }
> +
> + if (!port->logbuffer[port->logbuffer_head]) {
> + dev_warn(port->dev,
> + "Log buffer index %d is NULL\n", port->logbuffer_head);
> + goto abort;
> + }
> +
> + rem_nsec = do_div(ts_nsec, 1000000000);
> + scnprintf(port->logbuffer[port->logbuffer_head],
> + LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
> + (unsigned long)ts_nsec, rem_nsec / 1000,
> + tmpbuffer);
> + port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
> +
> +abort:
> + mutex_unlock(&port->logbuffer_lock);
> +}
> +
> +static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
> +{
> + va_list args;
> +
> + /* Do not log while disconnected and unattached */
> + if (tcpm_port_is_disconnected(port) &&
> + (port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
> + port->state == DRP_TOGGLING))
> + return;
> +
> + va_start(args, fmt);
> + _tcpm_log(port, fmt, args);
> + va_end(args);
> +}
> +
> +static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
> +{
> + va_list args;
> +
> + va_start(args, fmt);
> + _tcpm_log(port, fmt, args);
> + va_end(args);
> +}
> +
> +static void tcpm_log_source_caps(struct tcpm_port *port)
> +{
> + int i;
> +
> + for (i = 0; i < port->nr_source_caps; i++) {
> + u32 pdo = port->source_caps[i];
> + enum pd_pdo_type type = pdo_type(pdo);
> + char msg[64];
> +
> + switch (type) {
> + case PDO_TYPE_FIXED:
> + scnprintf(msg, sizeof(msg),
> + "%u mV, %u mA [%s%s%s%s%s%s]",
> + pdo_fixed_voltage(pdo),
> + pdo_max_current(pdo),
> + (pdo & PDO_FIXED_DUAL_ROLE) ?
> + "R" : "",
> + (pdo & PDO_FIXED_SUSPEND) ?
> + "S" : "",
> + (pdo & PDO_FIXED_HIGHER_CAP) ?
> + "H" : "",
> + (pdo & PDO_FIXED_USB_COMM) ?
> + "U" : "",
> + (pdo & PDO_FIXED_DATA_SWAP) ?
> + "D" : "",
> + (pdo & PDO_FIXED_EXTPOWER) ?
> + "E" : "");
> + break;
> + case PDO_TYPE_VAR:
> + scnprintf(msg, sizeof(msg),
> + "%u-%u mV, %u mA",
> + pdo_min_voltage(pdo),
> + pdo_max_voltage(pdo),
> + pdo_max_current(pdo));
> + break;
> + case PDO_TYPE_BATT:
> + scnprintf(msg, sizeof(msg),
> + "%u-%u mV, %u mW",
> + pdo_min_voltage(pdo),
> + pdo_max_voltage(pdo),
> + pdo_max_power(pdo));
> + break;
> + default:
> + strcpy(msg, "undefined");
> + break;
> + }
> + tcpm_log(port, " PDO %d: type %d, %s",
> + i, type, msg);
> + }
> +}
> +
> +static int tcpm_seq_show(struct seq_file *s, void *v)
> +{
> + struct tcpm_port *port = (struct tcpm_port *)s->private;
> + int tail;
> +
> + mutex_lock(&port->logbuffer_lock);
> + tail = port->logbuffer_tail;
> + while (tail != port->logbuffer_head) {
> + seq_printf(s, "%s\n", port->logbuffer[tail]);
> + tail = (tail + 1) % LOG_BUFFER_ENTRIES;
> + }
> + if (!seq_has_overflowed(s))
> + port->logbuffer_tail = tail;
> + mutex_unlock(&port->logbuffer_lock);
> +
> + return 0;
> +}
> +
> +static int tcpm_debug_open(struct inode *inode, struct file *file)
> +{
> + return single_open(file, tcpm_seq_show, inode->i_private);
> +}
> +
> +static const struct file_operations tcpm_debug_operations = {
> + .open = tcpm_debug_open,
> + .llseek = seq_lseek,
> + .read = seq_read,
> + .release = single_release,
> +};
> +
> +static struct dentry *rootdir;
> +
> +static int tcpm_debugfs_init(struct tcpm_port *port)
> +{
> + mutex_init(&port->logbuffer_lock);
> + /* /sys/kernel/debug/tcpm/usbcX */
> + if (!rootdir) {
> + rootdir = debugfs_create_dir("tcpm", NULL);
> + if (!rootdir)
> + return -ENOMEM;
> + }
> +
> + port->dentry = debugfs_create_file(dev_name(port->dev),
> + S_IFREG | 0444, rootdir,
> + port, &tcpm_debug_operations);
> +
> + return 0;
> +}
> +
> +static void tcpm_debugfs_exit(struct tcpm_port *port)
> +{
> + debugfs_remove(port->dentry);
> +}
> +
> +#else
> +
> +static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
> +static void tcpm_log_source_caps(struct tcpm_port *port) { }
> +static int tcpm_debugfs_init(const struct tcpm_port *port) { return 0; }
> +static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
> +
> +#endif
> +
> +static int tcpm_pd_transmit(struct tcpm_port *port,
> + enum tcpm_transmit_type type,
> + const struct pd_message *msg)
> +{
> + unsigned long timeout;
> + int ret;
> +
> + if (msg)
> + tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
> + else
> + tcpm_log(port, "PD TX, type: %#x", type);
> +
> + reinit_completion(&port->tx_complete);
> + ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
> + if (ret < 0)
> + return ret;
> +
> + mutex_unlock(&port->lock);
> + timeout = wait_for_completion_timeout(&port->tx_complete,
> + msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
> + mutex_lock(&port->lock);
> + if (!timeout)
> + return -ETIMEDOUT;
> +
> + switch (port->tx_status) {
> + case TCPC_TX_SUCCESS:
> + port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
> + return 0;
> + case TCPC_TX_DISCARDED:
> + return -EAGAIN;
> + case TCPC_TX_FAILED:
> + default:
> + return -EIO;
> + }
> +}
> +
> +void tcpm_pd_transmit_complete(struct tcpm_port *port,
> + enum tcpm_transmit_status status)
> +{
> + tcpm_log(port, "PD TX complete, status: %u", status);
> + port->tx_status = status;
> + complete(&port->tx_complete);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
> +
> +static int tcpm_mux_set(struct tcpm_port *port, enum tcpc_mux_mode mode,
> + enum tcpc_usb_switch config)
> +{
> + int ret = 0;
> +
> + tcpm_log(port, "Requesting mux mode %d, config %d, polarity %d",
> + mode, config, port->polarity);
> +
> + if (port->tcpc->mux)
> + ret = port->tcpc->mux->set(port->tcpc->mux, mode, config,
> + port->polarity);
> +
> + return ret;
> +}
> +
> +static int tcpm_set_polarity(struct tcpm_port *port,
> + enum typec_cc_polarity polarity)
> +{
> + int ret;
> +
> + tcpm_log(port, "polarity %d", polarity);
> +
> + ret = port->tcpc->set_polarity(port->tcpc, polarity);
> + if (ret < 0)
> + return ret;
> +
> + port->polarity = polarity;
> +
> + return 0;
> +}
> +
> +static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
> +{
> + int ret;
> +
> + tcpm_log(port, "vconn:=%d", enable);
> +
> + ret = port->tcpc->set_vconn(port->tcpc, enable);
> + if (!ret) {
> + port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
> + typec_set_vconn_role(port->typec_port, port->vconn_role);
> + }
> +
> + return ret;
> +}
> +
> +static u32 tcpm_get_current_limit(struct tcpm_port *port)
> +{
> + enum typec_cc_status cc;
> + u32 limit;
> +
> + cc = port->polarity ? port->cc2 : port->cc1;
> + switch (cc) {
> + case TYPEC_CC_RP_1_5:
> + limit = 1500;
> + break;
> + case TYPEC_CC_RP_3_0:
> + limit = 3000;
> + break;
> + case TYPEC_CC_RP_DEF:
> + default:
> + limit = 0;
> + break;
> + }
> +
> + return limit;
> +}
> +
> +static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
> +{
> + int ret = -EOPNOTSUPP;
> +
> + tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
> +
> + if (port->tcpc->set_current_limit)
> + ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
> +
> + return ret;
> +}
> +
> +/*
> + * Determine RP value to set based on maximum current supported
> + * by a port if configured as source.
> + * Returns CC value to report to link partner.
> + */
> +static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
> +{
> + const u32 *src_pdo = port->src_pdo;
> + int nr_pdo = port->nr_src_pdo;
> + int i;
> +
> + /*
> + * Search for first entry with matching voltage.
> + * It should report the maximum supported current.
> + */
> + for (i = 0; i < nr_pdo; i++) {
> + const u32 pdo = src_pdo[i];
> +
> + if (pdo_type(pdo) == PDO_TYPE_FIXED &&
> + pdo_fixed_voltage(pdo) == 5000) {
> + unsigned int curr = pdo_max_current(pdo);
> +
> + if (curr >= 3000)
> + return TYPEC_CC_RP_3_0;
> + else if (curr >= 1500)
> + return TYPEC_CC_RP_1_5;
> + return TYPEC_CC_RP_DEF;
> + }
> + }
> +
> + return TYPEC_CC_RP_DEF;
> +}
> +
> +static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
> +{
> + return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
> + port->data_role);
> +}
> +
> +static int tcpm_set_roles(struct tcpm_port *port, bool attached,
> + enum typec_role role, enum typec_data_role data)
> +{
> + int ret;
> +
> + if (data == TYPEC_HOST)
> + ret = tcpm_mux_set(port, TYPEC_MUX_USB,
> + TCPC_USB_SWITCH_CONNECT);
> + else
> + ret = tcpm_mux_set(port, TYPEC_MUX_NONE,
> + TCPC_USB_SWITCH_DISCONNECT);
> + if (ret < 0)
> + return ret;
> +
> + ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
> + if (ret < 0)
> + return ret;
> +
> + port->pwr_role = role;
> + port->data_role = data;
> + typec_set_data_role(port->typec_port, data);
> + typec_set_pwr_role(port->typec_port, role);
> +
> + return 0;
> +}
> +
> +static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
> +{
> + int ret;
> +
> + ret = port->tcpc->set_roles(port->tcpc, true, role,
> + port->data_role);
> + if (ret < 0)
> + return ret;
> +
> + port->pwr_role = role;
> + typec_set_pwr_role(port->typec_port, role);
> +
> + return 0;
> +}
> +
> +static int tcpm_pd_send_source_caps(struct tcpm_port *port)
> +{
> + struct pd_message msg;
> + int i;
> +
> + memset(&msg, 0, sizeof(msg));
> + if (!port->nr_src_pdo) {
> + /* No source capabilities defined, sink only */
> + msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
> + port->pwr_role,
> + port->data_role,
> + port->message_id, 0);
> + } else {
> + msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
> + port->pwr_role,
> + port->data_role,
> + port->message_id,
> + port->nr_src_pdo);
> + }
> + for (i = 0; i < port->nr_src_pdo; i++)
> + msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
> +
> + return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> +}
> +
> +static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
> +{
> + struct pd_message msg;
> + int i;
> +
> + memset(&msg, 0, sizeof(msg));
> + if (!port->nr_snk_pdo) {
> + /* No sink capabilities defined, source only */
> + msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
> + port->pwr_role,
> + port->data_role,
> + port->message_id, 0);
> + } else {
> + msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
> + port->pwr_role,
> + port->data_role,
> + port->message_id,
> + port->nr_snk_pdo);
> + }
> + for (i = 0; i < port->nr_snk_pdo; i++)
> + msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
> +
> + return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> +}
> +
> +static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
> + unsigned int delay_ms)
> +{
> + if (delay_ms) {
> + tcpm_log(port, "pending state change %s -> %s @ %u ms",
> + tcpm_states[port->state], tcpm_states[state],
> + delay_ms);
> + port->delayed_state = state;
> + mod_delayed_work(port->wq, &port->state_machine,
> + msecs_to_jiffies(delay_ms));
> + port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
> + port->delay_ms = delay_ms;
> + } else {
> + tcpm_log(port, "state change %s -> %s",
> + tcpm_states[port->state], tcpm_states[state]);
> + port->delayed_state = INVALID_STATE;
> + port->prev_state = port->state;
> + port->state = state;
> + /*
> + * Don't re-queue the state machine work item if we're currently
> + * in the state machine and we're immediately changing states.
> + * tcpm_state_machine_work() will continue running the state
> + * machine.
> + */
> + if (!port->state_machine_running)
> + mod_delayed_work(port->wq, &port->state_machine, 0);
> + }
> +}
> +
> +static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
> + unsigned int delay_ms)
> +{
> + if (port->enter_state == port->state)
> + tcpm_set_state(port, state, delay_ms);
> + else
> + tcpm_log(port,
> + "skipped %sstate change %s -> %s [%u ms], context state %s",
> + delay_ms ? "delayed " : "",
> + tcpm_states[port->state], tcpm_states[state],
> + delay_ms, tcpm_states[port->enter_state]);
> +}
> +
> +static void tcpm_queue_message(struct tcpm_port *port,
> + enum pd_msg_request message)
> +{
> + port->queued_message = message;
> + mod_delayed_work(port->wq, &port->state_machine, 0);
> +}
> +
> +/*
> + * VDM/VDO handling functions
> + */
> +static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
> + const u32 *data, int cnt)
> +{
> + port->vdo_count = cnt + 1;
> + port->vdo_data[0] = header;
> + memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
> + /* Set ready, vdm state machine will actually send */
> + port->vdm_retries = 0;
> + port->vdm_state = VDM_STATE_READY;
> +}
> +
> +static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
> + int cnt)
> +{
> + u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
> + u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
> +
> + memset(&port->mode_data, 0, sizeof(port->mode_data));
> +
> +#if 0 /* Not really a match */
> + switch (PD_IDH_PTYPE(vdo)) {
> + case IDH_PTYPE_UNDEF:
> + port->partner.type = TYPEC_PARTNER_NONE; /* no longer exists */
> + break;
> + case IDH_PTYPE_HUB:
> + break;
> + case IDH_PTYPE_PERIPH:
> + break;
> + case IDH_PTYPE_PCABLE:
> + break;
> + case IDH_PTYPE_ACABLE:
> + break;
> + case IDH_PTYPE_AMA:
> + port->partner.type = TYPEC_PARTNER_ALTMODE;
> + break;
> + default:
> + break;
> + }
> +#endif
> +
> + port->partner_ident.id_header = vdo;
> + port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
> + port->partner_ident.product = product;
> +
> + typec_partner_set_identity(port->partner);
> +
> + tcpm_log(port, "Identity: %04x:%04x.%04x",
> + PD_IDH_VID(vdo),
> + PD_PRODUCT_PID(product), product & 0xffff);
> +}
> +
> +static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
> + int cnt)
> +{
> + struct pd_mode_data *pmdata = &port->mode_data;
> + int i;
> +
> + for (i = 1; i < cnt; i++) {
> + u32 p = le32_to_cpu(payload[i]);
> + u16 svid;
> +
> + svid = (p >> 16) & 0xffff;
> + if (!svid)
> + return false;
> +
> + if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
> + goto abort;
> +
> + pmdata->svids[pmdata->nsvids++] = svid;
> + tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
> +
> + svid = p & 0xffff;
> + if (!svid)
> + return false;
> +
> + if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
> + goto abort;
> +
> + pmdata->svids[pmdata->nsvids++] = svid;
> + tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
> + }
> + return true;
> +abort:
> + tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
> + return false;
> +}
> +
> +static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
> + int cnt)
> +{
> + struct pd_mode_data *pmdata = &port->mode_data;
> + struct typec_altmode_desc *paltmode;
> + struct typec_mode_desc *pmode;
> + int i;
> +
> + if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
> + /* Already logged in svdm_consume_svids() */
> + return;
> + }
> +
> + paltmode = &pmdata->altmode_desc[pmdata->altmodes];
> + memset(paltmode, 0, sizeof(*paltmode));
> +
> + paltmode->svid = pmdata->svids[pmdata->svid_index];
> +
> + tcpm_log(port, " Alternate mode %d: SVID 0x%04x",
> + pmdata->altmodes, paltmode->svid);
> +
> + for (i = 1; i < cnt && paltmode->n_modes < ALTMODE_MAX_MODES; i++) {
> + pmode = &paltmode->modes[paltmode->n_modes];
> + memset(pmode, 0, sizeof(*pmode));
> + pmode->vdo = le32_to_cpu(payload[i]);
> + pmode->index = i - 1;
> + paltmode->n_modes++;
> + tcpm_log(port, " VDO %d: 0x%08x",
> + pmode->index, pmode->vdo);
> + }
> + port->partner_altmode[pmdata->altmodes] =
> + typec_partner_register_altmode(port->partner, paltmode);
> + if (port->partner_altmode[pmdata->altmodes] == NULL) {
> + tcpm_log(port,
> + "Failed to register alternate modes for SVID 0x%04x",
> + paltmode->svid);
> + return;
> + }
> + pmdata->altmodes++;
> +}
> +
> +#define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
> +
> +static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
> + u32 *response)
> +{
> + u32 p0 = le32_to_cpu(payload[0]);
> + int cmd_type = PD_VDO_CMDT(p0);
> + int cmd = PD_VDO_CMD(p0);
> + struct pd_mode_data *modep;
> + int rlen = 0;
> + u16 svid;
> +
> + tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
> + p0, cmd_type, cmd, cnt);
> +
> + modep = &port->mode_data;
> +
> + switch (cmd_type) {
> + case CMDT_INIT:
> + switch (cmd) {
> + case CMD_DISCOVER_IDENT:
> + break;
> + case CMD_DISCOVER_SVID:
> + break;
> + case CMD_DISCOVER_MODES:
> + break;
> + case CMD_ENTER_MODE:
> + break;
> + case CMD_EXIT_MODE:
> + break;
> + case CMD_ATTENTION:
> + break;
> + default:
> + break;
> + }
> + if (rlen >= 1) {
> + response[0] = p0 | VDO_CMDT(CMDT_RSP_ACK);
> + } else if (rlen == 0) {
> + response[0] = p0 | VDO_CMDT(CMDT_RSP_NAK);
> + rlen = 1;
> + } else {
> + response[0] = p0 | VDO_CMDT(CMDT_RSP_BUSY);
> + rlen = 1;
> + }
> + break;
> + case CMDT_RSP_ACK:
> + /* silently drop message if we are not connected */
> + if (!port->partner)
> + break;
> +
> + switch (cmd) {
> + case CMD_DISCOVER_IDENT:
> + /* 6.4.4.3.1 */
> + svdm_consume_identity(port, payload, cnt);
> + response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
> + rlen = 1;
> + break;
> + case CMD_DISCOVER_SVID:
> + /* 6.4.4.3.2 */
> + if (svdm_consume_svids(port, payload, cnt)) {
> + response[0] = VDO(USB_SID_PD, 1,
> + CMD_DISCOVER_SVID);
> + rlen = 1;
> + } else if (modep->nsvids && supports_modal(port)) {
> + response[0] = VDO(modep->svids[0], 1,
> + CMD_DISCOVER_MODES);
> + rlen = 1;
> + }
> + break;
> + case CMD_DISCOVER_MODES:
> + /* 6.4.4.3.3 */
> + svdm_consume_modes(port, payload, cnt);
> + modep->svid_index++;
> + if (modep->svid_index < modep->nsvids) {
> + svid = modep->svids[modep->svid_index];
> + response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
> + rlen = 1;
> + } else {
> +#if 0
> + response[0] = pd_dfp_enter_mode(port, 0, 0);
> + if (response[0])
> + rlen = 1;
> +#endif
> + }
> + break;
> + case CMD_ENTER_MODE:
> + break;
> + default:
> + break;
> + }
> + break;
> + default:
> + break;
> + }
> +
> + return rlen;
> +}
> +
> +static void tcpm_handle_vdm_request(struct tcpm_port *port,
> + const __le32 *payload, int cnt)
> +{
> + int rlen = 0;
> + u32 response[8] = { };
> + u32 p0 = le32_to_cpu(payload[0]);
> +
> + if (port->vdm_state == VDM_STATE_BUSY) {
> + /* If UFP responded busy retry after timeout */
> + if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
> + port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
> + port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
> + CMDT_INIT;
> + mod_delayed_work(port->wq, &port->vdm_state_machine,
> + msecs_to_jiffies(PD_T_VDM_BUSY));
> + return;
> + }
> + port->vdm_state = VDM_STATE_DONE;
> + }
> +
> + if (PD_VDO_SVDM(p0))
> + rlen = tcpm_pd_svdm(port, payload, cnt, response);
> +#if 0
> + else
> + rlen = tcpm_pd_custom_vdm(port, cnt, payload, response);
> +#endif
> +
> + if (rlen > 0) {
> + tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
> + mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
> + }
> +}
> +
> +static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
> + const u32 *data, int count)
> +{
> + u32 header;
> +
> + if (WARN_ON(count > VDO_MAX_SIZE - 1))
> + count = VDO_MAX_SIZE - 1;
> +
> + /* set VDM header with VID & CMD */
> + header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
> + 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
> + tcpm_queue_vdm(port, header, data, count);
> +
> + mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
> +}
> +
> +static unsigned int vdm_ready_timeout(u32 vdm_hdr)
> +{
> + unsigned int timeout;
> + int cmd = PD_VDO_CMD(vdm_hdr);
> +
> + /* its not a structured VDM command */
> + if (!PD_VDO_SVDM(vdm_hdr))
> + return PD_T_VDM_UNSTRUCTURED;
> +
> + switch (PD_VDO_CMDT(vdm_hdr)) {
> + case CMDT_INIT:
> + if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
> + timeout = PD_T_VDM_WAIT_MODE_E;
> + else
> + timeout = PD_T_VDM_SNDR_RSP;
> + break;
> + default:
> + if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
> + timeout = PD_T_VDM_E_MODE;
> + else
> + timeout = PD_T_VDM_RCVR_RSP;
> + break;
> + }
> + return timeout;
> +}
> +
> +static void vdm_run_state_machine(struct tcpm_port *port)
> +{
> + struct pd_message msg;
> + int i, res;
> +
> + switch (port->vdm_state) {
> + case VDM_STATE_READY:
> + /* Only transmit VDM if attached */
> + if (!port->attached) {
> + port->vdm_state = VDM_STATE_ERR_BUSY;
> + break;
> + }
> +
> + /*
> + * if there's traffic or we're not in PDO ready state don't send
> + * a VDM.
> + */
> + if (port->state != SRC_READY && port->state != SNK_READY)
> + break;
> +
> + /* Prepare and send VDM */
> + memset(&msg, 0, sizeof(msg));
> + msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
> + port->pwr_role,
> + port->data_role,
> + port->message_id, port->vdo_count);
> + for (i = 0; i < port->vdo_count; i++)
> + msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
> + res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> + if (res < 0) {
> + port->vdm_state = VDM_STATE_ERR_SEND;
> + } else {
> + unsigned long timeout;
> +
> + port->vdm_retries = 0;
> + port->vdm_state = VDM_STATE_BUSY;
> + timeout = vdm_ready_timeout(port->vdo_data[0]);
> + mod_delayed_work(port->wq, &port->vdm_state_machine,
> + timeout);
> + }
> + break;
> + case VDM_STATE_WAIT_RSP_BUSY:
> + port->vdo_data[0] = port->vdo_retry;
> + port->vdo_count = 1;
> + port->vdm_state = VDM_STATE_READY;
> + break;
> + case VDM_STATE_BUSY:
> + port->vdm_state = VDM_STATE_ERR_TMOUT;
> + break;
> + case VDM_STATE_ERR_SEND:
> + /*
> + * A partner which does not support USB PD will not reply,
> + * so this is not a fatal error. At the same time, some
> + * devices may not return GoodCRC under some circumstances,
> + * so we need to retry.
> + */
> + if (port->vdm_retries < 3) {
> + tcpm_log(port, "VDM Tx error, retry");
> + port->vdm_retries++;
> + port->vdm_state = VDM_STATE_READY;
> + }
> + break;
> + default:
> + break;
> + }
> +}
> +
> +static void vdm_state_machine_work(struct work_struct *work)
> +{
> + struct tcpm_port *port = container_of(work, struct tcpm_port,
> + vdm_state_machine.work);
> + enum vdm_states prev_state;
> +
> + mutex_lock(&port->lock);
> +
> + /*
> + * Continue running as long as the port is not busy and there was
> + * a state change.
> + */
> + do {
> + prev_state = port->vdm_state;
> + vdm_run_state_machine(port);
> + } while (port->vdm_state != prev_state &&
> + port->vdm_state != VDM_STATE_BUSY);
> +
> + mutex_unlock(&port->lock);
> +}
> +
> +/*
> + * PD (data, control) command handling functions
> + */
> +static void tcpm_pd_data_request(struct tcpm_port *port,
> + const struct pd_message *msg)
> +{
> + enum pd_data_msg_type type = pd_header_type_le(msg->header);
> + unsigned int cnt = pd_header_cnt_le(msg->header);
> + unsigned int i;
> +
> + switch (type) {
> + case PD_DATA_SOURCE_CAP:
> + if (port->pwr_role != TYPEC_SINK)
> + break;
> +
> + for (i = 0; i < cnt; i++)
> + port->source_caps[i] = le32_to_cpu(msg->payload[i]);
> +
> + port->nr_source_caps = cnt;
> +
> + tcpm_log_source_caps(port);
> +
> + /*
> + * This message may be received even if VBUS is not
> + * present. This is quite unexpected; see USB PD
> + * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
> + * However, at the same time, we must be ready to
> + * receive this message and respond to it 15ms after
> + * receiving PS_RDY during power swap operations, no matter
> + * if VBUS is available or not (USB PD specification,
> + * section 6.5.9.2).
> + * So we need to accept the message either way,
> + * but be prepared to keep waiting for VBUS after it was
> + * handled.
> + */
> + tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
> + break;
> + case PD_DATA_REQUEST:
> + if (port->pwr_role != TYPEC_SOURCE ||
> + cnt != 1) {
> + tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> + break;
> + }
> + port->sink_request = le32_to_cpu(msg->payload[0]);
> + tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
> + break;
> + case PD_DATA_SINK_CAP:
> + /* We don't do anything with this at the moment... */
> + for (i = 0; i < cnt; i++)
> + port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
> + port->nr_sink_caps = cnt;
> + break;
> + case PD_DATA_VENDOR_DEF:
> + tcpm_handle_vdm_request(port, msg->payload, cnt);
> + break;
> + case PD_DATA_BIST:
> + if (port->state == SRC_READY || port->state == SNK_READY) {
> + port->bist_request = le32_to_cpu(msg->payload[0]);
> + tcpm_set_state(port, BIST_RX, 0);
> + }
> + break;
> + default:
> + tcpm_log(port, "Unhandled data message type %#x", type);
> + break;
> + }
> +}
> +
> +static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> + const struct pd_message *msg)
> +{
> + enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
> + enum tcpm_state next_state;
> +
> + switch (type) {
> + case PD_CTRL_GOOD_CRC:
> + case PD_CTRL_PING:
> + break;
> + case PD_CTRL_GET_SOURCE_CAP:
> + switch (port->state) {
> + case SRC_READY:
> + case SNK_READY:
> + tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
> + break;
> + default:
> + tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> + break;
> + }
> + break;
> + case PD_CTRL_GET_SINK_CAP:
> + switch (port->state) {
> + case SRC_READY:
> + case SNK_READY:
> + tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
> + break;
> + default:
> + tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> + break;
> + }
> + break;
> + case PD_CTRL_GOTO_MIN:
> + break;
> + case PD_CTRL_PS_RDY:
> + switch (port->state) {
> + case SNK_TRANSITION_SINK:
> + if (port->vbus_present) {
> + tcpm_set_current_limit(port,
> + port->current_limit,
> + port->supply_voltage);
> + tcpm_set_state(port, SNK_READY, 0);
> + } else {
> + /*
> + * Seen after power swap. Keep waiting for VBUS
> + * in a transitional state.
> + */
> + tcpm_set_state(port,
> + SNK_TRANSITION_SINK_VBUS, 0);
> + }
> + break;
> + case PR_SWAP_SRC_SNK_SOURCE_OFF:
> + tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
> + break;
> + case PR_SWAP_SNK_SRC_SINK_OFF:
> + tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
> + break;
> + case VCONN_SWAP_WAIT_FOR_VCONN:
> + tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
> + break;
> + default:
> + break;
> + }
> + break;
> + case PD_CTRL_REJECT:
> + case PD_CTRL_WAIT:
> + switch (port->state) {
> + case SNK_NEGOTIATE_CAPABILITIES:
> + /* USB PD specification, Figure 8-43 */
> + if (port->explicit_contract)
> + next_state = SNK_READY;
> + else
> + next_state = SNK_WAIT_CAPABILITIES;
> + tcpm_set_state(port, next_state, 0);
> + break;
> + case DR_SWAP_SEND:
> + port->swap_status = (type == PD_CTRL_WAIT ?
> + -EAGAIN : -EOPNOTSUPP);
> + tcpm_set_state(port, DR_SWAP_CANCEL, 0);
> + break;
> + case PR_SWAP_SEND:
> + port->swap_status = (type == PD_CTRL_WAIT ?
> + -EAGAIN : -EOPNOTSUPP);
> + tcpm_set_state(port, PR_SWAP_CANCEL, 0);
> + break;
> + case VCONN_SWAP_SEND:
> + port->swap_status = (type == PD_CTRL_WAIT ?
> + -EAGAIN : -EOPNOTSUPP);
> + tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
> + break;
> + default:
> + break;
> + }
> + break;
> + case PD_CTRL_ACCEPT:
> + switch (port->state) {
> + case SNK_NEGOTIATE_CAPABILITIES:
> + tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
> + break;
> + case SOFT_RESET_SEND:
> + port->message_id = 0;
> + if (port->pwr_role == TYPEC_SOURCE)
> + next_state = SRC_SEND_CAPABILITIES;
> + else
> + next_state = SNK_WAIT_CAPABILITIES;
> + tcpm_set_state(port, next_state, 0);
> + break;
> + case DR_SWAP_SEND:
> + tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
> + break;
> + case PR_SWAP_SEND:
> + tcpm_set_state(port, PR_SWAP_START, 0);
> + break;
> + case VCONN_SWAP_SEND:
> + tcpm_set_state(port, VCONN_SWAP_START, 0);
> + break;
> + default:
> + break;
> + }
> + break;
> + case PD_CTRL_SOFT_RESET:
> + tcpm_set_state(port, SOFT_RESET, 0);
> + break;
> + case PD_CTRL_DR_SWAP:
> + if (port->typec_caps.type != TYPEC_PORT_DRP) {
> + tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> + break;
> + }
> + /*
> + * XXX
> + * 6.3.9: If an alternate mode is active, a request to swap
> + * alternate modes shall trigger a port reset.
> + */
> + switch (port->state) {
> + case SRC_READY:
> + case SNK_READY:
> + tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
> + break;
> + default:
> + tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
> + break;
> + }
> + break;
> + case PD_CTRL_PR_SWAP:
> + if (port->typec_caps.type != TYPEC_PORT_DRP) {
> + tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
> + break;
> + }
> + switch (port->state) {
> + case SRC_READY:
> + case SNK_READY:
> + tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
> + break;
> + default:
> + tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
> + break;
> + }
> + break;
> + case PD_CTRL_VCONN_SWAP:
> + switch (port->state) {
> + case SRC_READY:
> + case SNK_READY:
> + tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
> + break;
> + default:
> + tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
> + break;
> + }
> + break;
> + default:
> + tcpm_log(port, "Unhandled ctrl message type %#x", type);
> + break;
> + }
> +}
> +
> +static void tcpm_pd_rx_handler(struct work_struct *work)
> +{
> + struct pd_rx_event *event = container_of(work,
> + struct pd_rx_event, work);
> + const struct pd_message *msg = &event->msg;
> + unsigned int cnt = pd_header_cnt_le(msg->header);
> + struct tcpm_port *port = event->port;
> +
> + mutex_lock(&port->lock);
> +
> + tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
> + port->attached);
> +
> + if (port->attached) {
> + /*
> + * If both ends believe to be DFP/host, we have a data role
> + * mismatch.
> + */
> + if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
> + (port->data_role == TYPEC_HOST)) {
> + tcpm_log(port,
> + "Data role mismatch, initiating error recovery");
> + tcpm_set_state(port, ERROR_RECOVERY, 0);
> + } else {
> + if (cnt)
> + tcpm_pd_data_request(port, msg);
> + else
> + tcpm_pd_ctrl_request(port, msg);
> + }
> + }
> +
> + mutex_unlock(&port->lock);
> + kfree(event);
> +}
> +
> +void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
> +{
> + struct pd_rx_event *event;
> +
> + event = kzalloc(sizeof(*event), GFP_ATOMIC);
> + if (!event)
> + return;
> +
> + INIT_WORK(&event->work, tcpm_pd_rx_handler);
> + event->port = port;
> + memcpy(&event->msg, msg, sizeof(*msg));
> + queue_work(port->wq, &event->work);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_pd_receive);
> +
> +static int tcpm_pd_send_control(struct tcpm_port *port,
> + enum pd_ctrl_msg_type type)
> +{
> + struct pd_message msg;
> +
> + memset(&msg, 0, sizeof(msg));
> + msg.header = PD_HEADER_LE(type, port->pwr_role,
> + port->data_role,
> + port->message_id, 0);
> +
> + return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> +}
> +
> +/*
> + * Send queued message without affecting state.
> + * Return true if state machine should go back to sleep,
> + * false otherwise.
> + */
> +static bool tcpm_send_queued_message(struct tcpm_port *port)
> +{
> + enum pd_msg_request queued_message;
> +
> + do {
> + queued_message = port->queued_message;
> + port->queued_message = PD_MSG_NONE;
> +
> + switch (queued_message) {
> + case PD_MSG_CTRL_WAIT:
> + tcpm_pd_send_control(port, PD_CTRL_WAIT);
> + break;
> + case PD_MSG_CTRL_REJECT:
> + tcpm_pd_send_control(port, PD_CTRL_REJECT);
> + break;
> + case PD_MSG_DATA_SINK_CAP:
> + tcpm_pd_send_sink_caps(port);
> + break;
> + case PD_MSG_DATA_SOURCE_CAP:
> + tcpm_pd_send_source_caps(port);
> + break;
> + default:
> + break;
> + }
> + } while (port->queued_message != PD_MSG_NONE);
> +
> + if (port->delayed_state != INVALID_STATE) {
> + if (time_is_after_jiffies(port->delayed_runtime)) {
> + mod_delayed_work(port->wq, &port->state_machine,
> + port->delayed_runtime - jiffies);
> + return true;
> + }
> + port->delayed_state = INVALID_STATE;
> + }
> + return false;
> +}
> +
> +static int tcpm_pd_check_request(struct tcpm_port *port)
> +{
> + u32 pdo, rdo = port->sink_request;
> + unsigned int max, op, pdo_max, index;
> + enum pd_pdo_type type;
> +
> + index = rdo_index(rdo);
> + if (!index || index > port->nr_src_pdo)
> + return -EINVAL;
> +
> + pdo = port->src_pdo[index - 1];
> + type = pdo_type(pdo);
> + switch (type) {
> + case PDO_TYPE_FIXED:
> + case PDO_TYPE_VAR:
> + max = rdo_max_current(rdo);
> + op = rdo_op_current(rdo);
> + pdo_max = pdo_max_current(pdo);
> +
> + if (op > pdo_max)
> + return -EINVAL;
> + if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
> + return -EINVAL;
> +
> + if (type == PDO_TYPE_FIXED)
> + tcpm_log(port,
> + "Requested %u mV, %u mA for %u / %u mA",
> + pdo_fixed_voltage(pdo), pdo_max, op, max);
> + else
> + tcpm_log(port,
> + "Requested %u -> %u mV, %u mA for %u / %u mA",
> + pdo_min_voltage(pdo), pdo_max_voltage(pdo),
> + pdo_max, op, max);
> + break;
> + case PDO_TYPE_BATT:
> + max = rdo_max_power(rdo);
> + op = rdo_op_power(rdo);
> + pdo_max = pdo_max_power(pdo);
> +
> + if (op > pdo_max)
> + return -EINVAL;
> + if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
> + return -EINVAL;
> + tcpm_log(port,
> + "Requested %u -> %u mV, %u mW for %u / %u mW",
> + pdo_min_voltage(pdo), pdo_max_voltage(pdo),
> + pdo_max, op, max);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + port->op_vsafe5v = index == 1;
> +
> + return 0;
> +}
> +
> +static int tcpm_pd_select_pdo(struct tcpm_port *port)
> +{
> + unsigned int i, max_mw = 0, max_mv = 0;
> + int ret = -EINVAL;
> +
> + /*
> + * Select the source PDO providing the most power while staying within
> + * the board's voltage limits. Prefer PDO providing exp
> + */
> + for (i = 0; i < port->nr_source_caps; i++) {
> + u32 pdo = port->source_caps[i];
> + enum pd_pdo_type type = pdo_type(pdo);
> + unsigned int mv, ma, mw;
> +
> + if (type == PDO_TYPE_FIXED)
> + mv = pdo_fixed_voltage(pdo);
> + else
> + mv = pdo_min_voltage(pdo);
> +
> + if (type == PDO_TYPE_BATT) {
> + mw = pdo_max_power(pdo);
> + } else {
> + ma = min(pdo_max_current(pdo),
> + port->max_snk_ma);
> + mw = ma * mv / 1000;
> + }
> +
> + /* Perfer higher voltages if available */
> + if ((mw > max_mw || (mw == max_mw && mv > max_mv)) &&
> + mv <= port->max_snk_mv) {
> + ret = i;
> + max_mw = mw;
> + max_mv = mv;
> + }
> + }
> +
> + return ret;
> +}
> +
> +static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
> +{
> + unsigned int mv, ma, mw, flags;
> + unsigned int max_ma, max_mw;
> + enum pd_pdo_type type;
> + int index;
> + u32 pdo;
> +
> + index = tcpm_pd_select_pdo(port);
> + if (index < 0)
> + return -EINVAL;
> + pdo = port->source_caps[index];
> + type = pdo_type(pdo);
> +
> + if (type == PDO_TYPE_FIXED)
> + mv = pdo_fixed_voltage(pdo);
> + else
> + mv = pdo_min_voltage(pdo);
> +
> + /* Select maximum available current within the board's power limit */
> + if (type == PDO_TYPE_BATT) {
> + mw = pdo_max_power(pdo);
> + ma = 1000 * min(mw, port->max_snk_mw) / mv;
> + } else {
> + ma = min(pdo_max_current(pdo),
> + 1000 * port->max_snk_mw / mv);
> + }
> + ma = min(ma, port->max_snk_ma);
> +
> + /* XXX: Any other flags need to be set? */
> + flags = 0;
> +
> + /* Set mismatch bit if offered power is less than operating power */
> + mw = ma * mv / 1000;
> + max_ma = ma;
> + max_mw = mw;
> + if (mw < port->operating_snk_mw) {
> + flags |= RDO_CAP_MISMATCH;
> + max_mw = port->operating_snk_mw;
> + max_ma = max_mw * 1000 / mv;
> + }
> +
> + tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
> + port->cc_req, port->cc1, port->cc2, port->vbus_source,
> + port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
> + port->polarity);
> +
> + if (type == PDO_TYPE_BATT) {
> + *rdo = RDO_BATT(index + 1, mw, max_mw, flags);
> +
> + tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
> + index, mv, mw,
> + flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
> + } else {
> + *rdo = RDO_FIXED(index + 1, ma, max_ma, flags);
> +
> + tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
> + index, mv, ma,
> + flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
> + }
> +
> + port->current_limit = ma;
> + port->supply_voltage = mv;
> +
> + return 0;
> +}
> +
> +static int tcpm_pd_send_request(struct tcpm_port *port)
> +{
> + struct pd_message msg;
> + int ret;
> + u32 rdo;
> +
> + ret = tcpm_pd_build_request(port, &rdo);
> + if (ret < 0)
> + return ret;
> +
> + memset(&msg, 0, sizeof(msg));
> + msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
> + port->pwr_role,
> + port->data_role,
> + port->message_id, 1);
> + msg.payload[0] = cpu_to_le32(rdo);
> +
> + return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
> +}
> +
> +static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
> +{
> + int ret;
> +
> + if (enable && port->vbus_charge)
> + return -EINVAL;
> +
> + tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
> +
> + ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
> + if (ret < 0)
> + return ret;
> +
> + port->vbus_source = enable;
> + return 0;
> +}
> +
> +static int tcpm_set_charge(struct tcpm_port *port, bool charge)
> +{
> + int ret;
> +
> + if (charge && port->vbus_source)
> + return -EINVAL;
> +
> + if (charge != port->vbus_charge) {
> + tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
> + ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
> + charge);
> + if (ret < 0)
> + return ret;
> + }
> + port->vbus_charge = charge;
> + return 0;
> +}
> +
> +static bool tcpm_start_drp_toggling(struct tcpm_port *port)
> +{
> + int ret;
> +
> + if (port->tcpc->start_drp_toggling &&
> + port->typec_caps.type == TYPEC_PORT_DRP) {
> + tcpm_log_force(port, "Start DRP toggling");
> + ret = port->tcpc->start_drp_toggling(port->tcpc,
> + tcpm_rp_cc(port));
> + if (!ret)
> + return true;
> + }
> +
> + return false;
> +}
> +
> +static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
> +{
> + tcpm_log(port, "cc:=%d", cc);
> + port->cc_req = cc;
> + port->tcpc->set_cc(port->tcpc, cc);
> +}
> +
> +static int tcpm_init_vbus(struct tcpm_port *port)
> +{
> + int ret;
> +
> + ret = port->tcpc->set_vbus(port->tcpc, false, false);
> + port->vbus_source = false;
> + port->vbus_charge = false;
> + return ret;
> +}
> +
> +static int tcpm_init_vconn(struct tcpm_port *port)
> +{
> + int ret;
> +
> + ret = port->tcpc->set_vconn(port->tcpc, false);
> + port->vconn_role = TYPEC_SINK;
> + return ret;
> +}
> +
> +static void tcpm_typec_connect(struct tcpm_port *port)
> +{
> + if (!port->connected) {
> + /* Make sure we don't report stale identity information */
> + memset(&port->partner_ident, 0, sizeof(port->partner_ident));
> + port->partner_desc.usb_pd = port->pd_capable;
> + if (tcpm_port_is_debug(port))
> + port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
> + else if (tcpm_port_is_audio(port))
> + port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
> + else
> + port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
> + port->partner = typec_register_partner(port->typec_port,
> + &port->partner_desc);
> + port->connected = true;
> + }
> +}
> +
> +static int tcpm_src_attach(struct tcpm_port *port)
> +{
> + enum typec_cc_polarity polarity =
> + port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
> + : TYPEC_POLARITY_CC1;
> + int ret;
> +
> + if (port->attached)
> + return 0;
> +
> + ret = tcpm_set_polarity(port, polarity);
> + if (ret < 0)
> + return ret;
> +
> + ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
> + if (ret < 0)
> + return ret;
> +
> + ret = port->tcpc->set_pd_rx(port->tcpc, true);
> + if (ret < 0)
> + goto out_disable_mux;
> +
> + /*
> + * USB Type-C specification, version 1.2,
> + * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
> + * Enable VCONN only if the non-RD port is set to RA.
> + */
> + if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
> + (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
> + ret = tcpm_set_vconn(port, true);
> + if (ret < 0)
> + goto out_disable_pd;
> + }
> +
> + ret = tcpm_set_vbus(port, true);
> + if (ret < 0)
> + goto out_disable_vconn;
> +
> + port->pd_capable = false;
> +
> + port->partner = NULL;
> +
> + port->attached = true;
> + port->send_discover = true;
> +
> + return 0;
> +
> +out_disable_vconn:
> + tcpm_set_vconn(port, false);
> +out_disable_pd:
> + port->tcpc->set_pd_rx(port->tcpc, false);
> +out_disable_mux:
> + tcpm_mux_set(port, TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT);
> + return ret;
> +}
> +
> +static void tcpm_typec_disconnect(struct tcpm_port *port)
> +{
> + if (port->connected) {
> + typec_unregister_partner(port->partner);
> + port->partner = NULL;
> + port->connected = false;
> + }
> +}
> +
> +static void tcpm_unregister_altmodes(struct tcpm_port *port)
> +{
> + struct pd_mode_data *modep = &port->mode_data;
> + int i;
> +
> + for (i = 0; i < modep->altmodes; i++) {
> + typec_unregister_altmode(port->partner_altmode[i]);
> + port->partner_altmode[i] = NULL;
> + }
> +
> + memset(modep, 0, sizeof(*modep));
> +}
> +
> +static void tcpm_reset_port(struct tcpm_port *port)
> +{
> + tcpm_unregister_altmodes(port);
> + tcpm_typec_disconnect(port);
> + port->attached = false;
> + port->pd_capable = false;
> +
> + port->tcpc->set_pd_rx(port->tcpc, false);
> + tcpm_init_vbus(port); /* also disables charging */
> + tcpm_init_vconn(port);
> + tcpm_set_current_limit(port, 0, 0);
> + tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
> + tcpm_set_attached_state(port, false);
> + port->try_src_count = 0;
> + port->try_snk_count = 0;
> +}
> +
> +static void tcpm_detach(struct tcpm_port *port)
> +{
> + if (!port->attached)
> + return;
> +
> + if (tcpm_port_is_disconnected(port))
> + port->hard_reset_count = 0;
> +
> + tcpm_reset_port(port);
> +}
> +
> +static void tcpm_src_detach(struct tcpm_port *port)
> +{
> + tcpm_detach(port);
> +}
> +
> +static int tcpm_snk_attach(struct tcpm_port *port)
> +{
> + int ret;
> +
> + if (port->attached)
> + return 0;
> +
> + ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
> + TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
> + if (ret < 0)
> + return ret;
> +
> + ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
> + if (ret < 0)
> + return ret;
> +
> + port->pd_capable = false;
> +
> + port->partner = NULL;
> +
> + port->attached = true;
> + port->send_discover = true;
> +
> + return 0;
> +}
> +
> +static void tcpm_snk_detach(struct tcpm_port *port)
> +{
> + tcpm_detach(port);
> +
> + /* XXX: (Dis)connect SuperSpeed mux? */
> +}
> +
> +static int tcpm_acc_attach(struct tcpm_port *port)
> +{
> + int ret;
> +
> + if (port->attached)
> + return 0;
> +
> + ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
> + if (ret < 0)
> + return ret;
> +
> + port->partner = NULL;
> +
> + tcpm_typec_connect(port);
> +
> + port->attached = true;
> +
> + return 0;
> +}
> +
> +static void tcpm_acc_detach(struct tcpm_port *port)
> +{
> + tcpm_detach(port);
> +}
> +
> +static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
> +{
> + if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
> + return HARD_RESET_SEND;
> + if (port->pd_capable)
> + return ERROR_RECOVERY;
> + if (port->pwr_role == TYPEC_SOURCE)
> + return SRC_UNATTACHED;
> + if (port->state == SNK_WAIT_CAPABILITIES)
> + return SNK_READY;
> + return SNK_UNATTACHED;
> +}
> +
> +static inline enum tcpm_state ready_state(struct tcpm_port *port)
> +{
> + if (port->pwr_role == TYPEC_SOURCE)
> + return SRC_READY;
> + else
> + return SNK_READY;
> +}
> +
> +static inline enum tcpm_state unattached_state(struct tcpm_port *port)
> +{
> + if (port->pwr_role == TYPEC_SOURCE)
> + return SRC_UNATTACHED;
> + else
> + return SNK_UNATTACHED;
> +}
> +
> +static void tcpm_check_send_discover(struct tcpm_port *port)
> +{
> + if (port->data_role == TYPEC_HOST && port->send_discover &&
> + port->pd_capable) {
> + tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
> + port->send_discover = false;
> + }
> +}
> +
> +static void tcpm_swap_complete(struct tcpm_port *port, int result)
> +{
> + if (port->swap_pending) {
> + port->swap_status = result;
> + port->swap_pending = false;
> + complete(&port->swap_complete);
> + }
> +}
> +
> +static void run_state_machine(struct tcpm_port *port)
> +{
> + int ret;
> +
> + port->enter_state = port->state;
> + switch (port->state) {
> + case DRP_TOGGLING:
> + break;
> + /* SRC states */
> + case SRC_UNATTACHED:
> + tcpm_swap_complete(port, -ENOTCONN);
> + tcpm_src_detach(port);
> + if (tcpm_start_drp_toggling(port)) {
> + tcpm_set_state(port, DRP_TOGGLING, 0);
> + break;
> + }
> + tcpm_set_cc(port, tcpm_rp_cc(port));
> + if (port->typec_caps.type == TYPEC_PORT_DRP)
> + tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
> + break;
> + case SRC_ATTACH_WAIT:
> + if (tcpm_port_is_debug(port))
> + tcpm_set_state(port, DEBUG_ACC_ATTACHED,
> + PD_T_CC_DEBOUNCE);
> + else if (tcpm_port_is_audio(port))
> + tcpm_set_state(port, AUDIO_ACC_ATTACHED,
> + PD_T_CC_DEBOUNCE);
> + else if (tcpm_port_is_source(port))
> + tcpm_set_state(port,
> + tcpm_try_snk(port) ? SNK_TRY
> + : SRC_ATTACHED,
> + PD_T_CC_DEBOUNCE);
> + break;
> +
> + case SNK_TRY:
> + port->try_snk_count++;
> + /*
> + * Requirements:
> + * - Do not drive vconn or vbus
> + * - Terminate CC pins (both) to Rd
> + * Action:
> + * - Wait for tDRPTry (PD_T_DRP_TRY).
> + * Until then, ignore any state changes.
> + */
> + tcpm_set_cc(port, TYPEC_CC_RD);
> + tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
> + break;
> + case SNK_TRY_WAIT:
> + if (port->vbus_present && tcpm_port_is_sink(port)) {
> + tcpm_set_state(port, SNK_ATTACHED, 0);
> + break;
> + }
> + if (!tcpm_port_is_sink(port)) {
> + tcpm_set_state(port, SRC_TRYWAIT,
> + PD_T_PD_DEBOUNCE);
> + break;
> + }
> + /* No vbus, cc state is sink or open */
> + tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED, PD_T_DRP_TRYWAIT);
> + break;
> + case SRC_TRYWAIT:
> + tcpm_set_cc(port, tcpm_rp_cc(port));
> + if (!port->vbus_present && tcpm_port_is_source(port))
> + tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
> + else
> + tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
> + PD_T_DRP_TRY);
> + break;
> + case SRC_TRYWAIT_UNATTACHED:
> + tcpm_set_state(port, SNK_UNATTACHED, 0);
> + break;
> +
> + case SRC_ATTACHED:
> + ret = tcpm_src_attach(port);
> + tcpm_set_state(port, SRC_UNATTACHED,
> + ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
> + break;
> + case SRC_STARTUP:
> + typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_USB);
> + port->pwr_opmode = TYPEC_PWR_MODE_USB;
> + port->caps_count = 0;
> + port->message_id = 0;
> + port->explicit_contract = false;
> + tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
> + break;
> + case SRC_SEND_CAPABILITIES:
> + port->caps_count++;
> + if (port->caps_count > PD_N_CAPS_COUNT) {
> + tcpm_set_state(port, SRC_READY, 0);
> + break;
> + }
> + ret = tcpm_pd_send_source_caps(port);
> + if (ret < 0) {
> + tcpm_set_state(port, SRC_SEND_CAPABILITIES,
> + PD_T_SEND_SOURCE_CAP);
> + } else {
> + /*
> + * Per standard, we should clear the reset counter here.
> + * However, that can result in state machine hang-ups.
> + * Reset it only in READY state to improve stability.
> + */
> + /* port->hard_reset_count = 0; */
> + port->caps_count = 0;
> + port->pd_capable = true;
> + tcpm_set_state_cond(port, hard_reset_state(port),
> + PD_T_SEND_SOURCE_CAP);
> + }
> + break;
> + case SRC_NEGOTIATE_CAPABILITIES:
> + ret = tcpm_pd_check_request(port);
> + if (ret < 0) {
> + tcpm_pd_send_control(port, PD_CTRL_REJECT);
> + if (!port->explicit_contract) {
> + tcpm_set_state(port,
> + SRC_WAIT_NEW_CAPABILITIES, 0);
> + } else {
> + tcpm_set_state(port, SRC_READY, 0);
> + }
> + } else {
> + tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> + tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
> + PD_T_SRC_TRANSITION);
> + }
> + break;
> + case SRC_TRANSITION_SUPPLY:
> + /* XXX: regulator_set_voltage(vbus, ...) */
> + tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
> + port->explicit_contract = true;
> + typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
> + port->pwr_opmode = TYPEC_PWR_MODE_PD;
> + tcpm_set_state_cond(port, SRC_READY, 0);
> + break;
> + case SRC_READY:
> +#if 1
> + port->hard_reset_count = 0;
> +#endif
> + port->try_src_count = 0;
> +
> + tcpm_typec_connect(port);
> +
> + tcpm_check_send_discover(port);
> + /*
> + * 6.3.5
> + * Sending ping messages is not necessary if
> + * - the source operates at vSafe5V
> + * or
> + * - The system is not operating in PD mode
> + * or
> + * - Both partners are connected using a Type-C connector
> + * XXX How do we know that ?
> + */
> + if (port->pwr_opmode == TYPEC_PWR_MODE_PD &&
> + !port->op_vsafe5v) {
> + tcpm_pd_send_control(port, PD_CTRL_PING);
> + tcpm_set_state_cond(port, SRC_READY,
> + PD_T_SOURCE_ACTIVITY);
> + }
> + break;
> + case SRC_WAIT_NEW_CAPABILITIES:
> + /* Nothing to do... */
> + break;
> +
> + /* SNK states */
> + case SNK_UNATTACHED:
> + tcpm_swap_complete(port, -ENOTCONN);
> + tcpm_snk_detach(port);
> + if (tcpm_start_drp_toggling(port)) {
> + tcpm_set_state(port, DRP_TOGGLING, 0);
> + break;
> + }
> + tcpm_set_cc(port, TYPEC_CC_RD);
> + if (port->typec_caps.type == TYPEC_PORT_DRP)
> + tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
> + break;
> + case SNK_ATTACH_WAIT:
> + if ((port->cc1 == TYPEC_CC_OPEN &&
> + port->cc2 != TYPEC_CC_OPEN) ||
> + (port->cc1 != TYPEC_CC_OPEN &&
> + port->cc2 == TYPEC_CC_OPEN))
> + tcpm_set_state(port, SNK_DEBOUNCED,
> + PD_T_CC_DEBOUNCE);
> + else if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(port, SNK_UNATTACHED,
> + PD_T_PD_DEBOUNCE);
> + break;
> + case SNK_DEBOUNCED:
> + if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(port, SNK_UNATTACHED,
> + PD_T_PD_DEBOUNCE);
> + else if (port->vbus_present)
> + tcpm_set_state(port,
> + tcpm_try_src(port) ? SRC_TRY
> + : SNK_ATTACHED,
> + 0);
> + else
> + /* Wait for VBUS, but not forever */
> + tcpm_set_state(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
> + break;
> +
> + case SRC_TRY:
> + port->try_src_count++;
> + tcpm_set_cc(port, tcpm_rp_cc(port));
> + tcpm_set_state(port, SNK_TRYWAIT, PD_T_DRP_TRY);
> + break;
> + case SRC_TRY_DEBOUNCE:
> + tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
> + break;
> + case SNK_TRYWAIT:
> + tcpm_set_cc(port, TYPEC_CC_RD);
> + tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, PD_T_CC_DEBOUNCE);
> + break;
> + case SNK_TRYWAIT_DEBOUNCE:
> + if (port->vbus_present) {
> + tcpm_set_state(port, SNK_ATTACHED, 0);
> + break;
> + }
> + if (tcpm_port_is_disconnected(port)) {
> + tcpm_set_state(port, SNK_UNATTACHED,
> + PD_T_PD_DEBOUNCE);
> + break;
> + }
> + if (tcpm_port_is_source(port))
> + tcpm_set_state(port, SRC_ATTACHED, 0);
> + /* XXX Are we supposed to stay in this state ? */
> + break;
> + case SNK_TRYWAIT_VBUS:
> + tcpm_set_state(port, SNK_ATTACHED, PD_T_CC_DEBOUNCE);
> + break;
> +
> + case SNK_ATTACHED:
> + ret = tcpm_snk_attach(port);
> + if (ret < 0)
> + tcpm_set_state(port, SNK_UNATTACHED, 0);
> + else
> + tcpm_set_state(port, SNK_STARTUP, 0);
> + break;
> + case SNK_STARTUP:
> + /* XXX: callback into infrastructure */
> + typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_USB);
> + port->pwr_opmode = TYPEC_PWR_MODE_USB;
> + port->message_id = 0;
> + port->explicit_contract = false;
> + tcpm_set_state(port, SNK_DISCOVERY, 0);
> + break;
> + case SNK_DISCOVERY:
> + if (port->vbus_present) {
> + tcpm_set_current_limit(port,
> + tcpm_get_current_limit(port),
> + 5000);
> + tcpm_set_charge(port, true);
> + tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
> + break;
> + }
> + /*
> + * For DRP, timeouts differ. Also, handling is supposed to be
> + * different and much more complex (dead battery detection;
> + * see USB power delivery specification, section 8.3.3.6.1.5.1).
> + */
> + tcpm_set_state(port, hard_reset_state(port),
> + port->typec_caps.type == TYPEC_PORT_DRP ?
> + PD_T_DB_DETECT : PD_T_NO_RESPONSE);
> + break;
> + case SNK_DISCOVERY_DEBOUNCE:
> + tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
> + PD_T_CC_DEBOUNCE);
> + break;
> + case SNK_DISCOVERY_DEBOUNCE_DONE:
> + if (!tcpm_port_is_disconnected(port) &&
> + tcpm_port_is_sink(port) &&
> + time_is_after_jiffies(port->delayed_runtime)) {
> + tcpm_set_state(port, SNK_DISCOVERY,
> + port->delayed_runtime - jiffies);
> + break;
> + }
> + tcpm_set_state(port, unattached_state(port), 0);
> + break;
> + case SNK_WAIT_CAPABILITIES:
> + ret = port->tcpc->set_pd_rx(port->tcpc, true);
> + if (ret < 0) {
> + tcpm_set_state(port, SNK_READY, 0);
> + break;
> + }
> + /*
> + * If VBUS has never been low, and we time out waiting
> + * for source cap, try a soft reset first, in case we
> + * were already in a stable contract before this boot.
> + * Do this only once.
> + */
> + if (port->vbus_never_low) {
> + port->vbus_never_low = false;
> + tcpm_set_state(port, SOFT_RESET_SEND,
> + PD_T_SINK_WAIT_CAP);
> + } else {
> + tcpm_set_state(port, hard_reset_state(port),
> + PD_T_SINK_WAIT_CAP);
> + }
> + break;
> + case SNK_NEGOTIATE_CAPABILITIES:
> + port->pd_capable = true;
> + port->hard_reset_count = 0;
> + ret = tcpm_pd_send_request(port);
> + if (ret < 0) {
> + /* Let the Source send capabilities again. */
> + tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
> + } else {
> + tcpm_set_state_cond(port, hard_reset_state(port),
> + PD_T_SENDER_RESPONSE);
> + }
> + break;
> + case SNK_TRANSITION_SINK:
> + case SNK_TRANSITION_SINK_VBUS:
> + tcpm_set_state(port, hard_reset_state(port),
> + PD_T_PS_TRANSITION);
> + break;
> + case SNK_READY:
> + port->try_snk_count = 0;
> + port->explicit_contract = true;
> + typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
> + port->pwr_opmode = TYPEC_PWR_MODE_PD;
> +
> + tcpm_typec_connect(port);
> +
> + tcpm_check_send_discover(port);
> + break;
> +
> + /* Accessory states */
> + case ACC_UNATTACHED:
> + tcpm_acc_detach(port);
> + tcpm_set_state(port, SRC_UNATTACHED, 0);
> + break;
> + case DEBUG_ACC_ATTACHED:
> + case AUDIO_ACC_ATTACHED:
> + ret = tcpm_acc_attach(port);
> + if (ret < 0)
> + tcpm_set_state(port, ACC_UNATTACHED, 0);
> + break;
> + case AUDIO_ACC_DEBOUNCE:
> + tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
> + break;
> +
> + /* Hard_Reset states */
> + case HARD_RESET_SEND:
> + tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
> + tcpm_set_state(port, HARD_RESET_START, 0);
> + break;
> + case HARD_RESET_START:
> + port->hard_reset_count++;
> + port->tcpc->set_pd_rx(port->tcpc, false);
> + tcpm_unregister_altmodes(port);
> + port->send_discover = true;
> + if (port->pwr_role == TYPEC_SOURCE)
> + tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
> + PD_T_PS_HARD_RESET);
> + else
> + tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
> + break;
> + case SRC_HARD_RESET_VBUS_OFF:
> + tcpm_set_vconn(port, true);
> + tcpm_set_vbus(port, false);
> + tcpm_set_roles(port, false, TYPEC_SOURCE, TYPEC_HOST);
> + tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
> + break;
> + case SRC_HARD_RESET_VBUS_ON:
> + tcpm_set_vbus(port, true);
> + port->tcpc->set_pd_rx(port->tcpc, true);
> + tcpm_set_attached_state(port, true);
> + tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
> + break;
> + case SNK_HARD_RESET_SINK_OFF:
> + tcpm_set_vconn(port, false);
> + tcpm_set_charge(port, false);
> + tcpm_set_roles(port, false, TYPEC_SINK, TYPEC_DEVICE);
> + /*
> + * VBUS may or may not toggle, depending on the adapter.
> + * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
> + * directly after timeout.
> + */
> + tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
> + break;
> + case SNK_HARD_RESET_WAIT_VBUS:
> + /* Assume we're disconnected if VBUS doesn't come back. */
> + tcpm_set_state(port, SNK_UNATTACHED,
> + PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
> + break;
> + case SNK_HARD_RESET_SINK_ON:
> + /* Note: There is no guarantee that VBUS is on in this state */
> + /*
> + * XXX:
> + * The specification suggests that dual mode ports in sink
> + * mode should transition to state PE_SRC_Transition_to_default.
> + * See USB power delivery specification chapter 8.3.3.6.1.3.
> + * This would mean to to
> + * - turn off VCONN, reset power supply
> + * - request hardware reset
> + * - turn on VCONN
> + * - Transition to state PE_Src_Startup
> + * SNK only ports shall transition to state Snk_Startup
> + * (see chapter 8.3.3.3.8).
> + * Similar, dual-mode ports in source mode should transition
> + * to PE_SNK_Transition_to_default.
> + */
> + tcpm_set_attached_state(port, true);
> + tcpm_set_state(port, SNK_STARTUP, 0);
> + break;
> +
> + /* Soft_Reset states */
> + case SOFT_RESET:
> + port->message_id = 0;
> + tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> + if (port->pwr_role == TYPEC_SOURCE)
> + tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
> + else
> + tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
> + break;
> + case SOFT_RESET_SEND:
> + port->message_id = 0;
> + if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
> + tcpm_set_state_cond(port, hard_reset_state(port), 0);
> + else
> + tcpm_set_state_cond(port, hard_reset_state(port),
> + PD_T_SENDER_RESPONSE);
> + break;
> +
> + /* DR_Swap states */
> + case DR_SWAP_SEND:
> + tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
> + tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
> + PD_T_SENDER_RESPONSE);
> + break;
> + case DR_SWAP_ACCEPT:
> + tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> + tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
> + break;
> + case DR_SWAP_SEND_TIMEOUT:
> + tcpm_swap_complete(port, -ETIMEDOUT);
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> + case DR_SWAP_CHANGE_DR:
> + if (port->data_role == TYPEC_HOST) {
> + tcpm_unregister_altmodes(port);
> + tcpm_set_roles(port, true, port->pwr_role,
> + TYPEC_DEVICE);
> + } else {
> + tcpm_set_roles(port, true, port->pwr_role,
> + TYPEC_HOST);
> + port->send_discover = true;
> + }
> + tcpm_swap_complete(port, 0);
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> +
> + /* PR_Swap states */
> + case PR_SWAP_ACCEPT:
> + tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> + tcpm_set_state(port, PR_SWAP_START, 0);
> + break;
> + case PR_SWAP_SEND:
> + tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
> + tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
> + PD_T_SENDER_RESPONSE);
> + break;
> + case PR_SWAP_SEND_TIMEOUT:
> + tcpm_swap_complete(port, -ETIMEDOUT);
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> + case PR_SWAP_START:
> + if (port->pwr_role == TYPEC_SOURCE)
> + tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
> + PD_T_SRC_TRANSITION);
> + else
> + tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
> + break;
> + case PR_SWAP_SRC_SNK_TRANSITION_OFF:
> + tcpm_set_vbus(port, false);
> + port->explicit_contract = false;
> + tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
> + PD_T_PS_SOURCE_OFF);
> + break;
> + case PR_SWAP_SRC_SNK_SOURCE_OFF:
> + tcpm_set_cc(port, TYPEC_CC_RD);
> + if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
> + tcpm_set_state(port, ERROR_RECOVERY, 0);
> + break;
> + }
> + tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
> + break;
> + case PR_SWAP_SRC_SNK_SINK_ON:
> + tcpm_set_pwr_role(port, TYPEC_SINK);
> + tcpm_swap_complete(port, 0);
> + tcpm_set_state(port, SNK_STARTUP, 0);
> + break;
> + case PR_SWAP_SNK_SRC_SINK_OFF:
> + tcpm_set_charge(port, false);
> + tcpm_set_state(port, hard_reset_state(port),
> + PD_T_PS_SOURCE_OFF);
> + break;
> + case PR_SWAP_SNK_SRC_SOURCE_ON:
> + tcpm_set_cc(port, tcpm_rp_cc(port));
> + tcpm_set_vbus(port, true);
> + tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
> + tcpm_set_pwr_role(port, TYPEC_SOURCE);
> + tcpm_swap_complete(port, 0);
> + tcpm_set_state(port, SRC_STARTUP, 0);
> + break;
> +
> + case VCONN_SWAP_ACCEPT:
> + tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
> + tcpm_set_state(port, VCONN_SWAP_START, 0);
> + break;
> + case VCONN_SWAP_SEND:
> + tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
> + tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
> + PD_T_SENDER_RESPONSE);
> + break;
> + case VCONN_SWAP_SEND_TIMEOUT:
> + tcpm_swap_complete(port, -ETIMEDOUT);
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> + case VCONN_SWAP_START:
> + if (port->vconn_role == TYPEC_SOURCE)
> + tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
> + else
> + tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
> + break;
> + case VCONN_SWAP_WAIT_FOR_VCONN:
> + tcpm_set_state(port, hard_reset_state(port),
> + PD_T_VCONN_SOURCE_ON);
> + break;
> + case VCONN_SWAP_TURN_ON_VCONN:
> + tcpm_set_vconn(port, true);
> + tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
> + tcpm_swap_complete(port, 0);
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> + case VCONN_SWAP_TURN_OFF_VCONN:
> + tcpm_set_vconn(port, false);
> + tcpm_swap_complete(port, 0);
> + tcpm_set_state(port, ready_state(port), 0);
> + break;
> +
> + case DR_SWAP_CANCEL:
> + case PR_SWAP_CANCEL:
> + case VCONN_SWAP_CANCEL:
> + tcpm_swap_complete(port, port->swap_status);
> + if (port->pwr_role == TYPEC_SOURCE)
> + tcpm_set_state(port, SRC_READY, 0);
> + else
> + tcpm_set_state(port, SNK_READY, 0);
> + break;
> +
> + case BIST_RX:
> + switch (BDO_MODE_MASK(port->bist_request)) {
> + case BDO_MODE_CARRIER2:
> + tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
> + break;
> + default:
> + break;
> + }
> + /* Always switch to unattached state */
> + tcpm_set_state(port, unattached_state(port), 0);
> + break;
> + case ERROR_RECOVERY:
> + tcpm_swap_complete(port, -EPROTO);
> + tcpm_reset_port(port);
> +
> + tcpm_set_cc(port, TYPEC_CC_OPEN);
> + tcpm_set_state(port, ERROR_RECOVERY_WAIT_OFF,
> + PD_T_ERROR_RECOVERY);
> + break;
> + case ERROR_RECOVERY_WAIT_OFF:
> + tcpm_set_state(port,
> + tcpm_default_state(port),
> + port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
> + break;
> + default:
> + WARN(1, "Unexpected port state %d\n", port->state);
> + break;
> + }
> +}
> +
> +static void tcpm_state_machine_work(struct work_struct *work)
> +{
> + struct tcpm_port *port = container_of(work, struct tcpm_port,
> + state_machine.work);
> + enum tcpm_state prev_state;
> +
> + mutex_lock(&port->lock);
> + port->state_machine_running = true;
> +
> + if (port->queued_message && tcpm_send_queued_message(port))
> + goto done;
> +
> + /* If we were queued due to a delayed state change, update it now */
> + if (port->delayed_state) {
> + tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
> + tcpm_states[port->state],
> + tcpm_states[port->delayed_state], port->delay_ms);
> + port->prev_state = port->state;
> + port->state = port->delayed_state;
> + port->delayed_state = INVALID_STATE;
> + }
> +
> + /*
> + * Continue running as long as we have (non-delayed) state changes
> + * to make.
> + */
> + do {
> + prev_state = port->state;
> + run_state_machine(port);
> + if (port->queued_message)
> + tcpm_send_queued_message(port);
> + } while (port->state != prev_state && !port->delayed_state);
> +
> +done:
> + port->state_machine_running = false;
> + mutex_unlock(&port->lock);
> +}
> +
> +static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
> + enum typec_cc_status cc2)
> +{
> + enum typec_cc_status old_cc1, old_cc2;
> + enum tcpm_state new_state;
> +
> + old_cc1 = port->cc1;
> + old_cc2 = port->cc2;
> + port->cc1 = cc1;
> + port->cc2 = cc2;
> +
> + tcpm_log_force(port,
> + "CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
> + old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
> + port->polarity,
> + tcpm_port_is_disconnected(port) ? "disconnected"
> + : "connected");
> +
> + switch (port->state) {
> + case DRP_TOGGLING:
> + if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
> + tcpm_port_is_source(port))
> + tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
> + else if (tcpm_port_is_sink(port))
> + tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
> + break;
> + case SRC_UNATTACHED:
> + case ACC_UNATTACHED:
> + if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
> + tcpm_port_is_source(port))
> + tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
> + break;
> + case SRC_ATTACH_WAIT:
> + if (tcpm_port_is_disconnected(port) ||
> + tcpm_port_is_audio_detached(port))
> + tcpm_set_state(port, SRC_UNATTACHED, 0);
> + else if (cc1 != old_cc1 || cc2 != old_cc2)
> + tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
> + break;
> + case SRC_ATTACHED:
> + if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(port, SRC_UNATTACHED, 0);
> + break;
> +
> + case SNK_UNATTACHED:
> + if (tcpm_port_is_sink(port))
> + tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
> + break;
> + case SNK_ATTACH_WAIT:
> + if ((port->cc1 == TYPEC_CC_OPEN &&
> + port->cc2 != TYPEC_CC_OPEN) ||
> + (port->cc1 != TYPEC_CC_OPEN &&
> + port->cc2 == TYPEC_CC_OPEN))
> + new_state = SNK_DEBOUNCED;
> + else if (tcpm_port_is_disconnected(port))
> + new_state = SNK_UNATTACHED;
> + else
> + break;
> + if (new_state != port->delayed_state)
> + tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
> + break;
> + case SNK_DEBOUNCED:
> + if (tcpm_port_is_disconnected(port))
> + new_state = SNK_UNATTACHED;
> + else if (port->vbus_present)
> + new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
> + else
> + new_state = SNK_UNATTACHED;
> + if (new_state != port->delayed_state)
> + tcpm_set_state(port, SNK_DEBOUNCED, 0);
> + break;
> + case SNK_READY:
> + if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(port, unattached_state(port), 0);
> + else if (!port->pd_capable &&
> + (cc1 != old_cc1 || cc2 != old_cc2))
> + tcpm_set_current_limit(port,
> + tcpm_get_current_limit(port),
> + 5000);
> + break;
> +
> + case AUDIO_ACC_ATTACHED:
> + if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
> + tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
> + break;
> + case AUDIO_ACC_DEBOUNCE:
> + if (tcpm_port_is_audio(port))
> + tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
> + break;
> +
> + case DEBUG_ACC_ATTACHED:
> + if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
> + tcpm_set_state(port, ACC_UNATTACHED, 0);
> + break;
> +
> + case SNK_TRY:
> + /* Do nothing, waiting for timeout */
> + break;
> +
> + case SNK_DISCOVERY:
> + /* CC line is unstable, wait for debounce */
> + if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
> + break;
> + case SNK_DISCOVERY_DEBOUNCE:
> + break;
> +
> + case SRC_TRYWAIT:
> + /* Hand over to state machine if needed */
> + if (!port->vbus_present && tcpm_port_is_source(port))
> + new_state = SRC_ATTACHED;
> + else
> + new_state = SRC_TRYWAIT_UNATTACHED;
> +
> + if (new_state != port->delayed_state)
> + tcpm_set_state(port, SRC_TRYWAIT, 0);
> + break;
> + case SNK_TRY_WAIT:
> + if (port->vbus_present && tcpm_port_is_sink(port)) {
> + tcpm_set_state(port, SNK_ATTACHED, 0);
> + break;
> + }
> + if (!tcpm_port_is_sink(port))
> + new_state = SRC_TRYWAIT;
> + else
> + new_state = SRC_TRYWAIT_UNATTACHED;
> +
> + if (new_state != port->delayed_state)
> + tcpm_set_state(port, SNK_TRY_WAIT, 0);
> + break;
> +
> + case SRC_TRY:
> + tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
> + break;
> + case SRC_TRY_DEBOUNCE:
> + tcpm_set_state(port, SRC_TRY, 0);
> + break;
> + case SNK_TRYWAIT_DEBOUNCE:
> + if (port->vbus_present) {
> + tcpm_set_state(port, SNK_ATTACHED, 0);
> + break;
> + }
> + if (tcpm_port_is_source(port)) {
> + tcpm_set_state(port, SRC_ATTACHED, 0);
> + break;
> + }
> + if (tcpm_port_is_disconnected(port) &&
> + port->delayed_state != SNK_UNATTACHED)
> + tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
> + break;
> +
> + case PR_SWAP_SNK_SRC_SINK_OFF:
> + case PR_SWAP_SRC_SNK_TRANSITION_OFF:
> + case PR_SWAP_SRC_SNK_SOURCE_OFF:
> + /*
> + * CC state change is expected here; we just turned off power.
> + * Ignore it.
> + */
> + break;
> +
> + default:
> + if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(port, unattached_state(port), 0);
> + break;
> + }
> +}
> +
> +static void _tcpm_pd_vbus_on(struct tcpm_port *port)
> +{
> + enum tcpm_state new_state;
> +
> + tcpm_log_force(port, "VBUS on");
> + port->vbus_present = true;
> + switch (port->state) {
> + case SNK_TRANSITION_SINK_VBUS:
> + tcpm_set_state(port, SNK_READY, 0);
> + break;
> + case SNK_DISCOVERY:
> + tcpm_set_state(port, SNK_DISCOVERY, 0);
> + break;
> +
> + case SNK_DEBOUNCED:
> + tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
> + : SNK_ATTACHED,
> + 0);
> + break;
> + case SNK_HARD_RESET_WAIT_VBUS:
> + tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
> + break;
> + case SRC_ATTACHED:
> + tcpm_set_state(port, SRC_STARTUP, 0);
> + break;
> + case SRC_HARD_RESET_VBUS_ON:
> + tcpm_set_state(port, SRC_STARTUP, 0);
> + break;
> +
> + case SNK_TRY:
> + /* Do nothing, waiting for timeout */
> + break;
> + case SRC_TRYWAIT:
> + /* Hand over to state machine if needed */
> + if (port->delayed_state != SRC_TRYWAIT_UNATTACHED)
> + tcpm_set_state(port, SRC_TRYWAIT, 0);
> + break;
> + case SNK_TRY_WAIT:
> + if (tcpm_port_is_sink(port)) {
> + tcpm_set_state(port, SNK_ATTACHED, 0);
> + break;
> + }
> + if (!tcpm_port_is_sink(port))
> + new_state = SRC_TRYWAIT;
> + else
> + new_state = SRC_TRYWAIT_UNATTACHED;
> +
> + if (new_state != port->delayed_state)
> + tcpm_set_state(port, SNK_TRY_WAIT, 0);
> + break;
> + case SNK_TRYWAIT:
> + tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
> + break;
> +
> + default:
> + break;
> + }
> +}
> +
> +static void _tcpm_pd_vbus_off(struct tcpm_port *port)
> +{
> + enum tcpm_state new_state;
> +
> + tcpm_log_force(port, "VBUS off");
> + port->vbus_present = false;
> + port->vbus_never_low = false;
> + switch (port->state) {
> + case SNK_HARD_RESET_SINK_OFF:
> + tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
> + break;
> + case SRC_HARD_RESET_VBUS_OFF:
> + tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
> + break;
> + case HARD_RESET_SEND:
> + break;
> +
> + case SNK_TRY:
> + /* Do nothing, waiting for timeout */
> + break;
> + case SRC_TRYWAIT:
> + /* Hand over to state machine if needed */
> + if (tcpm_port_is_source(port))
> + new_state = SRC_ATTACHED;
> + else
> + new_state = SRC_TRYWAIT_UNATTACHED;
> + if (new_state != port->delayed_state)
> + tcpm_set_state(port, SRC_TRYWAIT, 0);
> + break;
> + case SNK_TRY_WAIT:
> + if (!tcpm_port_is_sink(port))
> + new_state = SRC_TRYWAIT;
> + else
> + new_state = SRC_TRYWAIT_UNATTACHED;
> +
> + if (new_state != port->delayed_state)
> + tcpm_set_state(port, SNK_TRY_WAIT, 0);
> + break;
> + case SNK_TRYWAIT_VBUS:
> + tcpm_set_state(port, SNK_TRYWAIT, 0);
> + break;
> +
> + case SNK_ATTACH_WAIT:
> + tcpm_set_state(port, SNK_UNATTACHED, 0);
> + break;
> +
> + case SNK_NEGOTIATE_CAPABILITIES:
> + break;
> +
> + case PR_SWAP_SRC_SNK_TRANSITION_OFF:
> + tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
> + break;
> +
> + case PR_SWAP_SNK_SRC_SINK_OFF:
> + /* Do nothing, expected */
> + break;
> +
> + case ERROR_RECOVERY_WAIT_OFF:
> + tcpm_set_state(port,
> + port->pwr_role == TYPEC_SOURCE ?
> + SRC_UNATTACHED : SNK_UNATTACHED,
> + 0);
> + break;
> +
> + default:
> + if (port->pwr_role == TYPEC_SINK &&
> + port->attached)
> + tcpm_set_state(port, SNK_UNATTACHED, 0);
> + break;
> + }
> +}
> +
> +static void _tcpm_pd_hard_reset(struct tcpm_port *port)
> +{
> + tcpm_log_force(port, "Received hard reset");
> + /*
> + * If we keep receiving hard reset requests, executing the hard reset
> + * must have failed. Revert to error recovery if that happens.
> + */
> + tcpm_set_state(port,
> + port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
> + HARD_RESET_START : ERROR_RECOVERY,
> + 0);
> +}
> +
> +static void tcpm_pd_event_handler(struct work_struct *work)
> +{
> + struct tcpm_port *port = container_of(work, struct tcpm_port,
> + event_work);
> + u32 events;
> +
> + mutex_lock(&port->lock);
> +
> + spin_lock(&port->pd_event_lock);
> + while (port->pd_events) {
> + events = port->pd_events;
> + port->pd_events = 0;
> + spin_unlock(&port->pd_event_lock);
> + if (events & TCPM_RESET_EVENT)
> + _tcpm_pd_hard_reset(port);
> + if (events & TCPM_VBUS_EVENT) {
> + bool vbus;
> +
> + vbus = port->tcpc->get_vbus(port->tcpc);
> + if (vbus)
> + _tcpm_pd_vbus_on(port);
> + else
> + _tcpm_pd_vbus_off(port);
> + }
> + if (events & TCPM_CC_EVENT) {
> + enum typec_cc_status cc1, cc2;
> +
> + if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
> + _tcpm_cc_change(port, cc1, cc2);
> + }
> + spin_lock(&port->pd_event_lock);
> + }
> + spin_unlock(&port->pd_event_lock);
> + mutex_unlock(&port->lock);
> +}
> +
> +void tcpm_cc_change(struct tcpm_port *port)
> +{
> + spin_lock(&port->pd_event_lock);
> + port->pd_events |= TCPM_CC_EVENT;
> + spin_unlock(&port->pd_event_lock);
> + queue_work(port->wq, &port->event_work);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_cc_change);
> +
> +void tcpm_vbus_change(struct tcpm_port *port)
> +{
> + spin_lock(&port->pd_event_lock);
> + port->pd_events |= TCPM_VBUS_EVENT;
> + spin_unlock(&port->pd_event_lock);
> + queue_work(port->wq, &port->event_work);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_vbus_change);
> +
> +void tcpm_pd_hard_reset(struct tcpm_port *port)
> +{
> + spin_lock(&port->pd_event_lock);
> + port->pd_events = TCPM_RESET_EVENT;
> + spin_unlock(&port->pd_event_lock);
> + queue_work(port->wq, &port->event_work);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
> +
> +static int tcpm_dr_set(const struct typec_capability *cap,
> + enum typec_data_role data)
> +{
> + struct tcpm_port *port = typec_cap_to_tcpm(cap);
> + int ret;
> +
> + mutex_lock(&port->swap_lock);
> + mutex_lock(&port->lock);
> +
> + if (port->typec_caps.type != TYPEC_PORT_DRP || !port->pd_capable) {
> + ret = -EINVAL;
> + goto port_unlock;
> + }
> + if (port->state != SRC_READY && port->state != SNK_READY) {
> + ret = -EAGAIN;
> + goto port_unlock;
> + }
> +
> + if (port->data_role == data) {
> + ret = 0;
> + goto port_unlock;
> + }
> +
> + /*
> + * XXX
> + * 6.3.9: If an alternate mode is active, a request to swap
> + * alternate modes shall trigger a port reset.
> + * Reject data role swap request in this case.
> + */
> +
> + port->swap_status = 0;
> + port->swap_pending = true;
> + reinit_completion(&port->swap_complete);
> + tcpm_set_state(port, DR_SWAP_SEND, 0);
> + mutex_unlock(&port->lock);
> +
> + wait_for_completion(&port->swap_complete);
> +
> + ret = port->swap_status;
> + goto swap_unlock;
> +
> +port_unlock:
> + mutex_unlock(&port->lock);
> +swap_unlock:
> + mutex_unlock(&port->swap_lock);
> + return ret;
> +}
> +
> +static int tcpm_pr_set(const struct typec_capability *cap,
> + enum typec_role role)
> +{
> + struct tcpm_port *port = typec_cap_to_tcpm(cap);
> + int ret;
> +
> + mutex_lock(&port->swap_lock);
> + mutex_lock(&port->lock);
> +
> + if (port->typec_caps.type != TYPEC_PORT_DRP) {
> + ret = -EINVAL;
> + goto port_unlock;
> + }
> + if (port->state != SRC_READY && port->state != SNK_READY) {
> + ret = -EAGAIN;
> + goto port_unlock;
> + }
> +
> + if (role == port->pwr_role) {
> + ret = 0;
> + goto port_unlock;
> + }
> +
> + if (!port->pd_capable) {
> + /*
> + * If the partner is not PD capable, reset the port to
> + * trigger a role change. This can only work if a preferred
> + * role is configured, and if it matches the requested role.
> + */
> + if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
> + port->try_role == port->pwr_role) {
> + ret = -EINVAL;
> + goto port_unlock;
> + }
> + tcpm_set_state(port, HARD_RESET_SEND, 0);
> + ret = 0;
> + goto port_unlock;
> + }
> +
> + port->swap_status = 0;
> + port->swap_pending = true;
> + reinit_completion(&port->swap_complete);
> + tcpm_set_state(port, PR_SWAP_SEND, 0);
> + mutex_unlock(&port->lock);
> +
> + wait_for_completion(&port->swap_complete);
> +
> + ret = port->swap_status;
> + goto swap_unlock;
> +
> +port_unlock:
> + mutex_unlock(&port->lock);
> +swap_unlock:
> + mutex_unlock(&port->swap_lock);
> + return ret;
> +}
> +
> +static int tcpm_vconn_set(const struct typec_capability *cap,
> + enum typec_role role)
> +{
> + struct tcpm_port *port = typec_cap_to_tcpm(cap);
> + int ret;
> +
> + mutex_lock(&port->swap_lock);
> + mutex_lock(&port->lock);
> +
> + if (port->state != SRC_READY && port->state != SNK_READY) {
> + ret = -EAGAIN;
> + goto port_unlock;
> + }
> +
> + if (role == port->vconn_role) {
> + ret = 0;
> + goto port_unlock;
> + }
> +
> + port->swap_status = 0;
> + port->swap_pending = true;
> + reinit_completion(&port->swap_complete);
> + tcpm_set_state(port, VCONN_SWAP_SEND, 0);
> + mutex_unlock(&port->lock);
> +
> + wait_for_completion(&port->swap_complete);
> +
> + ret = port->swap_status;
> + goto swap_unlock;
> +
> +port_unlock:
> + mutex_unlock(&port->lock);
> +swap_unlock:
> + mutex_unlock(&port->swap_lock);
> + return ret;
> +}
> +
> +static int tcpm_try_role(const struct typec_capability *cap, int role)
> +{
> + struct tcpm_port *port = typec_cap_to_tcpm(cap);
> + struct tcpc_dev *tcpc = port->tcpc;
> + int ret = 0;
> +
> + mutex_lock(&port->lock);
> + if (tcpc->try_role)
> + ret = tcpc->try_role(tcpc, role);
> + if (!ret && !tcpc->config->try_role_hw)
> + port->try_role = role;
> + port->try_src_count = 0;
> + port->try_snk_count = 0;
> + mutex_unlock(&port->lock);
> +
> + return ret;
> +}
> +
> +static void tcpm_init(struct tcpm_port *port)
> +{
> + enum typec_cc_status cc1, cc2;
> +
> + port->tcpc->init(port->tcpc);
> +
> + tcpm_reset_port(port);
> +
> + /*
> + * XXX
> + * Should possibly wait for VBUS to settle if it was enabled locally
> + * since tcpm_reset_port() will disable VBUS.
> + */
> + port->vbus_present = port->tcpc->get_vbus(port->tcpc);
> + if (port->vbus_present)
> + port->vbus_never_low = true;
> +
> + tcpm_set_state(port, tcpm_default_state(port), 0);
> +
> + if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
> + _tcpm_cc_change(port, cc1, cc2);
> +
> + /*
> + * Some adapters need a clean slate at startup, and won't recover
> + * otherwise. So do not try to be fancy and force a clean disconnect.
> + */
> + tcpm_set_state(port, ERROR_RECOVERY, 0);
> +}
> +
> +void tcpm_tcpc_reset(struct tcpm_port *port)
> +{
> + mutex_lock(&port->lock);
> + /* XXX: Maintain PD connection if possible? */
> + tcpm_init(port);
> + mutex_unlock(&port->lock);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
> +
> +static int tcpm_copy_pdos(u32 *dest_pdo, const u32 *src_pdo,
> + unsigned int nr_pdo)
> +{
> + unsigned int i;
> +
> + if (nr_pdo > PDO_MAX_OBJECTS)
> + nr_pdo = PDO_MAX_OBJECTS;
> +
> + for (i = 0; i < nr_pdo; i++)
> + dest_pdo[i] = src_pdo[i];
> +
> + return nr_pdo;
> +}
> +
> +void tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
> + unsigned int nr_pdo)
> +{
> + mutex_lock(&port->lock);
> + port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, pdo, nr_pdo);
> + switch (port->state) {
> + case SRC_UNATTACHED:
> + case SRC_ATTACH_WAIT:
> + case SRC_TRYWAIT:
> + tcpm_set_cc(port, tcpm_rp_cc(port));
> + break;
> + case SRC_SEND_CAPABILITIES:
> + case SRC_NEGOTIATE_CAPABILITIES:
> + case SRC_READY:
> + case SRC_WAIT_NEW_CAPABILITIES:
> + tcpm_set_cc(port, tcpm_rp_cc(port));
> + tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
> + break;
> + default:
> + break;
> + }
> + mutex_unlock(&port->lock);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_update_source_capabilities);
> +
> +void tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
> + unsigned int nr_pdo,
> + unsigned int max_snk_mv,
> + unsigned int max_snk_ma,
> + unsigned int max_snk_mw,
> + unsigned int operating_snk_mw)
> +{
> + mutex_lock(&port->lock);
> + port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, pdo, nr_pdo);
> + port->max_snk_mv = max_snk_mv;
> + port->max_snk_ma = max_snk_ma;
> + port->max_snk_mw = max_snk_mw;
> + port->operating_snk_mw = operating_snk_mw;
> +
> + switch (port->state) {
> + case SNK_NEGOTIATE_CAPABILITIES:
> + case SNK_READY:
> + case SNK_TRANSITION_SINK:
> + case SNK_TRANSITION_SINK_VBUS:
> + tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
> + break;
> + default:
> + break;
> + }
> + mutex_unlock(&port->lock);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_update_sink_capabilities);
> +
> +struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
> +{
> + struct tcpm_port *port;
> + int i, err;
> +
> + if (!dev || !tcpc || !tcpc->config ||
> + !tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
> + !tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
> + !tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
> + return ERR_PTR(-EINVAL);
> +
> + port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
> + if (!port)
> + return ERR_PTR(-ENOMEM);
> +
> + port->dev = dev;
> + port->tcpc = tcpc;
> +
> + mutex_init(&port->lock);
> + mutex_init(&port->swap_lock);
> +
> + port->wq = create_singlethread_workqueue(dev_name(dev));
> + if (!port->wq)
> + return ERR_PTR(-ENOMEM);
> + INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
> + INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
> + INIT_WORK(&port->event_work, tcpm_pd_event_handler);
> +
> + spin_lock_init(&port->pd_event_lock);
> +
> + init_completion(&port->tx_complete);
> + init_completion(&port->swap_complete);
> +
> + port->nr_src_pdo = tcpm_copy_pdos(port->src_pdo, tcpc->config->src_pdo,
> + tcpc->config->nr_src_pdo);
> + port->nr_snk_pdo = tcpm_copy_pdos(port->snk_pdo, tcpc->config->snk_pdo,
> + tcpc->config->nr_snk_pdo);
> +
> + port->max_snk_mv = tcpc->config->max_snk_mv;
> + port->max_snk_ma = tcpc->config->max_snk_ma;
> + port->max_snk_mw = tcpc->config->max_snk_mw;
> + port->operating_snk_mw = tcpc->config->operating_snk_mw;
> + if (!tcpc->config->try_role_hw)
> + port->try_role = tcpc->config->default_role;
> + else
> + port->try_role = TYPEC_NO_PREFERRED_ROLE;
> +
> + port->typec_caps.prefer_role = tcpc->config->default_role;
> + port->typec_caps.type = tcpc->config->type;
> + port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
> + port->typec_caps.pd_revision = 0x0200; /* USB-PD spec release 2.0 */
> + port->typec_caps.dr_set = tcpm_dr_set;
> + port->typec_caps.pr_set = tcpm_pr_set;
> + port->typec_caps.vconn_set = tcpm_vconn_set;
> + port->typec_caps.try_role = tcpm_try_role;
> +
> + port->partner_desc.identity = &port->partner_ident;
> +
> + /*
> + * TODO:
> + * - alt_modes, set_alt_mode
> + * - {debug,audio}_accessory
> + */
> +
> + port->typec_port = typec_register_port(port->dev, &port->typec_caps);
> + if (IS_ERR(port->typec_port)) {
> + err = PTR_ERR(port->typec_port);
> + goto out_destroy_wq;
> + }
> +
> + if (tcpc->config->alt_modes) {
> + struct typec_altmode_desc *paltmode = tcpc->config->alt_modes;
> +
> + i = 0;
> + while (paltmode->svid && i < ARRAY_SIZE(port->port_altmode)) {
> + port->port_altmode[i] =
> + typec_port_register_altmode(port->typec_port,
> + paltmode);
> + if (!port->port_altmode[i]) {
> + tcpm_log(port,
> + "%s: failed to register port alternate mode 0x%x",
> + dev_name(dev), paltmode->svid);
> + break;
> + }
> + i++;
> + paltmode++;
> + }
> + }
> +
> + tcpm_debugfs_init(port);
> + mutex_lock(&port->lock);
> + tcpm_init(port);
> + mutex_unlock(&port->lock);
> +
> + tcpm_log(port, "%s: registered", dev_name(dev));
> + return port;
> +
> +out_destroy_wq:
> + destroy_workqueue(port->wq);
> + return ERR_PTR(err);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_register_port);
> +
> +void tcpm_unregister_port(struct tcpm_port *port)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
> + typec_unregister_altmode(port->port_altmode[i]);
> + typec_unregister_port(port->typec_port);
> + tcpm_debugfs_exit(port);
> + destroy_workqueue(port->wq);
> +}
> +EXPORT_SYMBOL_GPL(tcpm_unregister_port);
> +
> +MODULE_AUTHOR("Guenter Roeck <groeck at chromium.org>");
> +MODULE_DESCRIPTION("USB Type-C Port Manager");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
> new file mode 100644
> index 000000000000..969b365e6549
> --- /dev/null
> +++ b/drivers/staging/typec/tcpm.h
> @@ -0,0 +1,150 @@
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef __LINUX_USB_TCPM_H
> +#define __LINUX_USB_TCPM_H
> +
> +#include <linux/bitops.h>
> +#include <linux/usb/typec.h>
> +#include "pd.h"
> +
> +enum typec_cc_status {
> + TYPEC_CC_OPEN,
> + TYPEC_CC_RA,
> + TYPEC_CC_RD,
> + TYPEC_CC_RP_DEF,
> + TYPEC_CC_RP_1_5,
> + TYPEC_CC_RP_3_0,
> +};
> +
> +enum typec_cc_polarity {
> + TYPEC_POLARITY_CC1,
> + TYPEC_POLARITY_CC2,
> +};
> +
> +/* Time to wait for TCPC to complete transmit */
> +#define PD_T_TCPC_TX_TIMEOUT 100
> +
> +enum tcpm_transmit_status {
> + TCPC_TX_SUCCESS = 0,
> + TCPC_TX_DISCARDED = 1,
> + TCPC_TX_FAILED = 2,
> +};
> +
> +enum tcpm_transmit_type {
> + TCPC_TX_SOP = 0,
> + TCPC_TX_SOP_PRIME = 1,
> + TCPC_TX_SOP_PRIME_PRIME = 2,
> + TCPC_TX_SOP_DEBUG_PRIME = 3,
> + TCPC_TX_SOP_DEBUG_PRIME_PRIME = 4,
> + TCPC_TX_HARD_RESET = 5,
> + TCPC_TX_CABLE_RESET = 6,
> + TCPC_TX_BIST_MODE_2 = 7
> +};
> +
> +struct tcpc_config {
> + const u32 *src_pdo;
> + unsigned int nr_src_pdo;
> +
> + const u32 *snk_pdo;
> + unsigned int nr_snk_pdo;
> +
> + unsigned int max_snk_mv;
> + unsigned int max_snk_ma;
> + unsigned int max_snk_mw;
> + unsigned int operating_snk_mw;
> +
> + enum typec_port_type type;
> + enum typec_role default_role;
> + bool try_role_hw; /* try.{src,snk} implemented in hardware */
> +
> + struct typec_altmode_desc *alt_modes;
> +};
> +
> +enum tcpc_usb_switch {
> + TCPC_USB_SWITCH_CONNECT,
> + TCPC_USB_SWITCH_DISCONNECT,
> + TCPC_USB_SWITCH_RESTORE, /* TODO FIXME */
> +};
> +
> +/* Mux state attributes */
> +#define TCPC_MUX_USB_ENABLED BIT(0) /* USB enabled */
> +#define TCPC_MUX_DP_ENABLED BIT(1) /* DP enabled */
> +#define TCPC_MUX_POLARITY_INVERTED BIT(2) /* Polarity inverted */
> +
> +/* Mux modes, decoded to attributes */
> +enum tcpc_mux_mode {
> + TYPEC_MUX_NONE = 0, /* Open switch */
> + TYPEC_MUX_USB = TCPC_MUX_USB_ENABLED, /* USB only */
> + TYPEC_MUX_DP = TCPC_MUX_DP_ENABLED, /* DP only */
> + TYPEC_MUX_DOCK = TCPC_MUX_USB_ENABLED | /* Both USB and DP */
> + TCPC_MUX_DP_ENABLED,
> +};
> +
> +struct tcpc_mux_dev {
> + int (*set)(struct tcpc_mux_dev *dev, enum tcpc_mux_mode mux_mode,
> + enum tcpc_usb_switch usb_config,
> + enum typec_cc_polarity polarity);
> + bool dfp_only;
> + void *priv_data;
> +};
> +
> +struct tcpc_dev {
> + const struct tcpc_config *config;
> +
> + int (*init)(struct tcpc_dev *dev);
> + int (*get_vbus)(struct tcpc_dev *dev);
> + int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
> + int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
> + enum typec_cc_status *cc2);
> + int (*set_polarity)(struct tcpc_dev *dev,
> + enum typec_cc_polarity polarity);
> + int (*set_vconn)(struct tcpc_dev *dev, bool on);
> + int (*set_vbus)(struct tcpc_dev *dev, bool on, bool charge);
> + int (*set_current_limit)(struct tcpc_dev *dev, u32 max_ma, u32 mv);
> + int (*set_pd_rx)(struct tcpc_dev *dev, bool on);
> + int (*set_roles)(struct tcpc_dev *dev, bool attached,
> + enum typec_role role, enum typec_data_role data);
> + int (*start_drp_toggling)(struct tcpc_dev *dev,
> + enum typec_cc_status cc);
> + int (*try_role)(struct tcpc_dev *dev, int role);
> + int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type type,
> + const struct pd_message *msg);
> + struct tcpc_mux_dev *mux;
> +};
> +
> +struct tcpm_port;
> +
> +struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc);
> +void tcpm_unregister_port(struct tcpm_port *port);
> +
> +void tcpm_update_source_capabilities(struct tcpm_port *port, const u32 *pdo,
> + unsigned int nr_pdo);
> +void tcpm_update_sink_capabilities(struct tcpm_port *port, const u32 *pdo,
> + unsigned int nr_pdo,
> + unsigned int max_snk_mv,
> + unsigned int max_snk_ma,
> + unsigned int max_snk_mw,
> + unsigned int operating_snk_mw);
> +
> +void tcpm_vbus_change(struct tcpm_port *port);
> +void tcpm_cc_change(struct tcpm_port *port);
> +void tcpm_pd_receive(struct tcpm_port *port,
> + const struct pd_message *msg);
> +void tcpm_pd_transmit_complete(struct tcpm_port *port,
> + enum tcpm_transmit_status status);
> +void tcpm_pd_hard_reset(struct tcpm_port *port);
> +void tcpm_tcpc_reset(struct tcpm_port *port);
> +
> +#endif /* __LINUX_USB_TCPM_H */
> --
> 2.7.4
>
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