[PATCH 087/510] staging: iio: new adis16201 driver
Greg Kroah-Hartman
gregkh at suse.de
Mon Jan 10 20:36:51 UTC 2011
From: Barry Song <barry.song at analog.com>
IIO driver for dual Axis Accelerometer/inclinometer adis16201 parts.
Signed-off-by: Barry Song <barry.song at analog.com>
Signed-off-by: Michael Hennerich <michael.hennerich at analog.com>
Acked-by: Jonathan Cameron <jic23 at cam.ac.uk>
Signed-off-by: Mike Frysinger <vapier at gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
---
drivers/staging/iio/accel/Kconfig | 9 +
drivers/staging/iio/accel/Makefile | 4 +
drivers/staging/iio/accel/adis16201.h | 150 ++++++
drivers/staging/iio/accel/adis16201_core.c | 659 +++++++++++++++++++++++++
drivers/staging/iio/accel/adis16201_ring.c | 218 ++++++++
drivers/staging/iio/accel/adis16201_trigger.c | 122 +++++
6 files changed, 1162 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/iio/accel/adis16201.h
create mode 100644 drivers/staging/iio/accel/adis16201_core.c
create mode 100644 drivers/staging/iio/accel/adis16201_ring.c
create mode 100644 drivers/staging/iio/accel/adis16201_trigger.c
diff --git a/drivers/staging/iio/accel/Kconfig b/drivers/staging/iio/accel/Kconfig
index 5926c03..0b87557 100644
--- a/drivers/staging/iio/accel/Kconfig
+++ b/drivers/staging/iio/accel/Kconfig
@@ -3,6 +3,15 @@
#
comment "Accelerometers"
+config ADIS16201
+ tristate "Analog Devices ADIS16201 Dual-Axis Digital Inclinometer and Accelerometer"
+ depends on SPI
+ select IIO_TRIGGER if IIO_RING_BUFFER
+ select IIO_SW_RING if IIO_RING_BUFFER
+ help
+ Say yes here to build support for Analog Devices adis16201 dual-axis
+ digital inclinometer and accelerometer.
+
config ADIS16209
tristate "Analog Devices ADIS16209 Dual-Axis Digital Inclinometer and Accelerometer"
depends on SPI
diff --git a/drivers/staging/iio/accel/Makefile b/drivers/staging/iio/accel/Makefile
index ff84703..4a22a01 100644
--- a/drivers/staging/iio/accel/Makefile
+++ b/drivers/staging/iio/accel/Makefile
@@ -2,6 +2,10 @@
# Makefile for industrial I/O accelerometer drivers
#
+adis16201-y := adis16201_core.o
+adis16201-$(CONFIG_IIO_RING_BUFFER) += adis16201_ring.o adis16201_trigger.o
+obj-$(CONFIG_ADIS16201) += adis16201.o
+
adis16209-y := adis16209_core.o
adis16209-$(CONFIG_IIO_RING_BUFFER) += adis16209_ring.o adis16209_trigger.o
obj-$(CONFIG_ADIS16209) += adis16209.o
diff --git a/drivers/staging/iio/accel/adis16201.h b/drivers/staging/iio/accel/adis16201.h
new file mode 100644
index 0000000..c9bf22c
--- /dev/null
+++ b/drivers/staging/iio/accel/adis16201.h
@@ -0,0 +1,150 @@
+#ifndef SPI_ADIS16201_H_
+#define SPI_ADIS16201_H_
+
+#define ADIS16201_STARTUP_DELAY 220 /* ms */
+
+#define ADIS16201_READ_REG(a) a
+#define ADIS16201_WRITE_REG(a) ((a) | 0x80)
+
+#define ADIS16201_FLASH_CNT 0x00 /* Flash memory write count */
+#define ADIS16201_SUPPLY_OUT 0x02 /* Output, power supply */
+#define ADIS16201_XACCL_OUT 0x04 /* Output, x-axis accelerometer */
+#define ADIS16201_YACCL_OUT 0x06 /* Output, y-axis accelerometer */
+#define ADIS16201_AUX_ADC 0x08 /* Output, auxiliary ADC input */
+#define ADIS16201_TEMP_OUT 0x0A /* Output, temperature */
+#define ADIS16201_XINCL_OUT 0x0C /* Output, x-axis inclination */
+#define ADIS16201_YINCL_OUT 0x0E /* Output, y-axis inclination */
+#define ADIS16201_XACCL_OFFS 0x10 /* Calibration, x-axis acceleration offset */
+#define ADIS16201_YACCL_OFFS 0x12 /* Calibration, y-axis acceleration offset */
+#define ADIS16201_XACCL_SCALE 0x14 /* x-axis acceleration scale factor */
+#define ADIS16201_YACCL_SCALE 0x16 /* y-axis acceleration scale factor */
+#define ADIS16201_XINCL_OFFS 0x18 /* Calibration, x-axis inclination offset */
+#define ADIS16201_YINCL_OFFS 0x1A /* Calibration, y-axis inclination offset */
+#define ADIS16201_XINCL_SCALE 0x1C /* x-axis inclination scale factor */
+#define ADIS16201_YINCL_SCALE 0x1E /* y-axis inclination scale factor */
+#define ADIS16201_ALM_MAG1 0x20 /* Alarm 1 amplitude threshold */
+#define ADIS16201_ALM_MAG2 0x22 /* Alarm 2 amplitude threshold */
+#define ADIS16201_ALM_SMPL1 0x24 /* Alarm 1, sample period */
+#define ADIS16201_ALM_SMPL2 0x26 /* Alarm 2, sample period */
+#define ADIS16201_ALM_CTRL 0x28 /* Alarm control */
+#define ADIS16201_AUX_DAC 0x30 /* Auxiliary DAC data */
+#define ADIS16201_GPIO_CTRL 0x32 /* General-purpose digital input/output control */
+#define ADIS16201_MSC_CTRL 0x34 /* Miscellaneous control */
+#define ADIS16201_SMPL_PRD 0x36 /* Internal sample period (rate) control */
+#define ADIS16201_AVG_CNT 0x38 /* Operation, filter configuration */
+#define ADIS16201_SLP_CNT 0x3A /* Operation, sleep mode control */
+#define ADIS16201_DIAG_STAT 0x3C /* Diagnostics, system status register */
+#define ADIS16201_GLOB_CMD 0x3E /* Operation, system command register */
+
+#define ADIS16201_OUTPUTS 7
+
+/* MSC_CTRL */
+#define ADIS16201_MSC_CTRL_SELF_TEST_EN (1 << 8) /* Self-test enable */
+#define ADIS16201_MSC_CTRL_DATA_RDY_EN (1 << 2) /* Data-ready enable: 1 = enabled, 0 = disabled */
+#define ADIS16201_MSC_CTRL_ACTIVE_HIGH (1 << 1) /* Data-ready polarity: 1 = active high, 0 = active low */
+#define ADIS16201_MSC_CTRL_DATA_RDY_DIO1 (1 << 0) /* Data-ready line selection: 1 = DIO1, 0 = DIO0 */
+
+/* DIAG_STAT */
+#define ADIS16201_DIAG_STAT_ALARM2 (1<<9) /* Alarm 2 status: 1 = alarm active, 0 = alarm inactive */
+#define ADIS16201_DIAG_STAT_ALARM1 (1<<8) /* Alarm 1 status: 1 = alarm active, 0 = alarm inactive */
+#define ADIS16201_DIAG_STAT_SPI_FAIL (1<<3) /* SPI communications failure */
+#define ADIS16201_DIAG_STAT_FLASH_UPT (1<<2) /* Flash update failure */
+#define ADIS16201_DIAG_STAT_POWER_HIGH (1<<1) /* Power supply above 3.625 V */
+#define ADIS16201_DIAG_STAT_POWER_LOW (1<<0) /* Power supply below 3.15 V */
+
+/* GLOB_CMD */
+#define ADIS16201_GLOB_CMD_SW_RESET (1<<7)
+#define ADIS16201_GLOB_CMD_FACTORY_CAL (1<<1)
+
+#define ADIS16201_MAX_TX 14
+#define ADIS16201_MAX_RX 14
+
+#define ADIS16201_ERROR_ACTIVE (1<<14)
+
+/**
+ * struct adis16201_state - device instance specific data
+ * @us: actual spi_device
+ * @work_trigger_to_ring: bh for triggered event handling
+ * @inter: used to check if new interrupt has been triggered
+ * @last_timestamp: passing timestamp from th to bh of interrupt handler
+ * @indio_dev: industrial I/O device structure
+ * @trig: data ready trigger registered with iio
+ * @tx: transmit buffer
+ * @rx: recieve buffer
+ * @buf_lock: mutex to protect tx and rx
+ **/
+struct adis16201_state {
+ struct spi_device *us;
+ struct work_struct work_trigger_to_ring;
+ s64 last_timestamp;
+ struct iio_dev *indio_dev;
+ struct iio_trigger *trig;
+ u8 *tx;
+ u8 *rx;
+ struct mutex buf_lock;
+};
+
+int adis16201_set_irq(struct device *dev, bool enable);
+
+#ifdef CONFIG_IIO_RING_BUFFER
+enum adis16201_scan {
+ ADIS16201_SCAN_SUPPLY,
+ ADIS16201_SCAN_ACC_X,
+ ADIS16201_SCAN_ACC_Y,
+ ADIS16201_SCAN_AUX_ADC,
+ ADIS16201_SCAN_TEMP,
+ ADIS16201_SCAN_INCLI_X,
+ ADIS16201_SCAN_INCLI_Y,
+};
+
+void adis16201_remove_trigger(struct iio_dev *indio_dev);
+int adis16201_probe_trigger(struct iio_dev *indio_dev);
+
+ssize_t adis16201_read_data_from_ring(struct device *dev,
+ struct device_attribute *attr,
+ char *buf);
+
+int adis16201_configure_ring(struct iio_dev *indio_dev);
+void adis16201_unconfigure_ring(struct iio_dev *indio_dev);
+
+int adis16201_initialize_ring(struct iio_ring_buffer *ring);
+void adis16201_uninitialize_ring(struct iio_ring_buffer *ring);
+#else /* CONFIG_IIO_RING_BUFFER */
+
+static inline void adis16201_remove_trigger(struct iio_dev *indio_dev)
+{
+}
+
+static inline int adis16201_probe_trigger(struct iio_dev *indio_dev)
+{
+ return 0;
+}
+
+static inline ssize_t
+adis16201_read_data_from_ring(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return 0;
+}
+
+static int adis16201_configure_ring(struct iio_dev *indio_dev)
+{
+ return 0;
+}
+
+static inline void adis16201_unconfigure_ring(struct iio_dev *indio_dev)
+{
+}
+
+static inline int adis16201_initialize_ring(struct iio_ring_buffer *ring)
+{
+ return 0;
+}
+
+static inline void adis16201_uninitialize_ring(struct iio_ring_buffer *ring)
+{
+}
+
+#endif /* CONFIG_IIO_RING_BUFFER */
+#endif /* SPI_ADIS16201_H_ */
diff --git a/drivers/staging/iio/accel/adis16201_core.c b/drivers/staging/iio/accel/adis16201_core.c
new file mode 100644
index 0000000..79b785a
--- /dev/null
+++ b/drivers/staging/iio/accel/adis16201_core.c
@@ -0,0 +1,659 @@
+/*
+ * ADIS16201 Programmable Digital Vibration Sensor driver
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+#include "accel.h"
+#include "inclinometer.h"
+#include "../gyro/gyro.h"
+#include "../adc/adc.h"
+
+#include "adis16201.h"
+
+#define DRIVER_NAME "adis16201"
+
+static int adis16201_check_status(struct device *dev);
+
+/**
+ * adis16201_spi_write_reg_8() - write single byte to a register
+ * @dev: device associated with child of actual device (iio_dev or iio_trig)
+ * @reg_address: the address of the register to be written
+ * @val: the value to write
+ **/
+static int adis16201_spi_write_reg_8(struct device *dev,
+ u8 reg_address,
+ u8 val)
+{
+ int ret;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADIS16201_WRITE_REG(reg_address);
+ st->tx[1] = val;
+
+ ret = spi_write(st->us, st->tx, 2);
+ mutex_unlock(&st->buf_lock);
+
+ return ret;
+}
+
+/**
+ * adis16201_spi_write_reg_16() - write 2 bytes to a pair of registers
+ * @dev: device associated with child of actual device (iio_dev or iio_trig)
+ * @reg_address: the address of the lower of the two registers. Second register
+ * is assumed to have address one greater.
+ * @val: value to be written
+ **/
+static int adis16201_spi_write_reg_16(struct device *dev,
+ u8 lower_reg_address,
+ u16 value)
+{
+ int ret;
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ }, {
+ .tx_buf = st->tx + 2,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADIS16201_WRITE_REG(lower_reg_address);
+ st->tx[1] = value & 0xFF;
+ st->tx[2] = ADIS16201_WRITE_REG(lower_reg_address + 1);
+ st->tx[3] = (value >> 8) & 0xFF;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfers[0], &msg);
+ spi_message_add_tail(&xfers[1], &msg);
+ ret = spi_sync(st->us, &msg);
+ mutex_unlock(&st->buf_lock);
+
+ return ret;
+}
+
+/**
+ * adis16201_spi_read_reg_16() - read 2 bytes from a 16-bit register
+ * @dev: device associated with child of actual device (iio_dev or iio_trig)
+ * @reg_address: the address of the lower of the two registers. Second register
+ * is assumed to have address one greater.
+ * @val: somewhere to pass back the value read
+ **/
+static int adis16201_spi_read_reg_16(struct device *dev,
+ u8 lower_reg_address,
+ u16 *val)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
+ int ret;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ .delay_usecs = 20,
+ }, {
+ .rx_buf = st->rx,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ .delay_usecs = 20,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADIS16201_READ_REG(lower_reg_address);
+ st->tx[1] = 0;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfers[0], &msg);
+ spi_message_add_tail(&xfers[1], &msg);
+ ret = spi_sync(st->us, &msg);
+ if (ret) {
+ dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
+ lower_reg_address);
+ goto error_ret;
+ }
+ *val = (st->rx[0] << 8) | st->rx[1];
+
+error_ret:
+ mutex_unlock(&st->buf_lock);
+ return ret;
+}
+
+static ssize_t adis16201_read_12bit_unsigned(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u16 val = 0;
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+
+ ret = adis16201_spi_read_reg_16(dev, this_attr->address, &val);
+ if (ret)
+ return ret;
+
+ if (val & ADIS16201_ERROR_ACTIVE) {
+ ret = adis16201_check_status(dev);
+ if (ret)
+ return ret;
+ }
+
+ return sprintf(buf, "%u\n", val & 0x0FFF);
+}
+
+static ssize_t adis16201_read_temp(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ ssize_t ret;
+ u16 val;
+
+ /* Take the iio_dev status lock */
+ mutex_lock(&indio_dev->mlock);
+
+ ret = adis16201_spi_read_reg_16(dev, ADIS16201_TEMP_OUT, (u16 *)&val);
+ if (ret)
+ goto error_ret;
+
+ if (val & ADIS16201_ERROR_ACTIVE) {
+ ret = adis16201_check_status(dev);
+ if (ret)
+ goto error_ret;
+ }
+
+ val &= 0xFFF;
+ ret = sprintf(buf, "%d\n", val);
+
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+}
+
+static ssize_t adis16201_read_9bit_signed(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ s16 val = 0;
+ ssize_t ret;
+
+ mutex_lock(&indio_dev->mlock);
+
+ ret = adis16201_spi_read_reg_16(dev, this_attr->address, (u16 *)&val);
+ if (!ret) {
+ if (val & ADIS16201_ERROR_ACTIVE) {
+ ret = adis16201_check_status(dev);
+ if (ret)
+ goto error_ret;
+ }
+ val = ((s16)(val << 7) >> 7);
+ ret = sprintf(buf, "%d\n", val);
+ }
+
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret;
+}
+
+static ssize_t adis16201_read_12bit_signed(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ s16 val = 0;
+ ssize_t ret;
+
+ mutex_lock(&indio_dev->mlock);
+
+ ret = adis16201_spi_read_reg_16(dev, this_attr->address, (u16 *)&val);
+ if (!ret) {
+ if (val & ADIS16201_ERROR_ACTIVE) {
+ ret = adis16201_check_status(dev);
+ if (ret)
+ goto error_ret;
+ }
+
+ val = ((s16)(val << 4) >> 4);
+ ret = sprintf(buf, "%d\n", val);
+ }
+
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret;
+}
+
+static ssize_t adis16201_read_14bit_signed(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ s16 val = 0;
+ ssize_t ret;
+
+ mutex_lock(&indio_dev->mlock);
+
+ ret = adis16201_spi_read_reg_16(dev, this_attr->address, (u16 *)&val);
+ if (!ret) {
+ if (val & ADIS16201_ERROR_ACTIVE) {
+ ret = adis16201_check_status(dev);
+ if (ret)
+ goto error_ret;
+ }
+
+ val = ((s16)(val << 2) >> 2);
+ ret = sprintf(buf, "%d\n", val);
+ }
+
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret;
+}
+
+static ssize_t adis16201_write_16bit(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int ret;
+ long val;
+
+ ret = strict_strtol(buf, 10, &val);
+ if (ret)
+ goto error_ret;
+ ret = adis16201_spi_write_reg_16(dev, this_attr->address, val);
+
+error_ret:
+ return ret ? ret : len;
+}
+
+static int adis16201_reset(struct device *dev)
+{
+ int ret;
+ ret = adis16201_spi_write_reg_8(dev,
+ ADIS16201_GLOB_CMD,
+ ADIS16201_GLOB_CMD_SW_RESET);
+ if (ret)
+ dev_err(dev, "problem resetting device");
+
+ return ret;
+}
+
+static ssize_t adis16201_write_reset(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ if (len < 1)
+ return -EINVAL;
+ switch (buf[0]) {
+ case '1':
+ case 'y':
+ case 'Y':
+ return adis16201_reset(dev);
+ }
+ return -EINVAL;
+}
+
+int adis16201_set_irq(struct device *dev, bool enable)
+{
+ int ret = 0;
+ u16 msc;
+
+ ret = adis16201_spi_read_reg_16(dev, ADIS16201_MSC_CTRL, &msc);
+ if (ret)
+ goto error_ret;
+
+ msc |= ADIS16201_MSC_CTRL_ACTIVE_HIGH;
+ msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_DIO1;
+ if (enable)
+ msc |= ADIS16201_MSC_CTRL_DATA_RDY_EN;
+ else
+ msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_EN;
+
+ ret = adis16201_spi_write_reg_16(dev, ADIS16201_MSC_CTRL, msc);
+
+error_ret:
+ return ret;
+}
+
+static int adis16201_check_status(struct device *dev)
+{
+ u16 status;
+ int ret;
+
+ ret = adis16201_spi_read_reg_16(dev, ADIS16201_DIAG_STAT, &status);
+ if (ret < 0) {
+ dev_err(dev, "Reading status failed\n");
+ goto error_ret;
+ }
+ ret = status & 0xF;
+ if (ret)
+ ret = -EFAULT;
+
+ if (status & ADIS16201_DIAG_STAT_SPI_FAIL)
+ dev_err(dev, "SPI failure\n");
+ if (status & ADIS16201_DIAG_STAT_FLASH_UPT)
+ dev_err(dev, "Flash update failed\n");
+ if (status & ADIS16201_DIAG_STAT_POWER_HIGH)
+ dev_err(dev, "Power supply above 3.625V\n");
+ if (status & ADIS16201_DIAG_STAT_POWER_LOW)
+ dev_err(dev, "Power supply below 3.15V\n");
+
+error_ret:
+ return ret;
+}
+
+static int adis16201_self_test(struct device *dev)
+{
+ int ret;
+ ret = adis16201_spi_write_reg_16(dev,
+ ADIS16201_MSC_CTRL,
+ ADIS16201_MSC_CTRL_SELF_TEST_EN);
+ if (ret) {
+ dev_err(dev, "problem starting self test");
+ goto err_ret;
+ }
+
+ ret = adis16201_check_status(dev);
+
+err_ret:
+ return ret;
+}
+
+static int adis16201_initial_setup(struct adis16201_state *st)
+{
+ int ret;
+ struct device *dev = &st->indio_dev->dev;
+
+ /* Disable IRQ */
+ ret = adis16201_set_irq(dev, false);
+ if (ret) {
+ dev_err(dev, "disable irq failed");
+ goto err_ret;
+ }
+
+ /* Do self test */
+ ret = adis16201_self_test(dev);
+ if (ret) {
+ dev_err(dev, "self test failure");
+ goto err_ret;
+ }
+
+ /* Read status register to check the result */
+ ret = adis16201_check_status(dev);
+ if (ret) {
+ adis16201_reset(dev);
+ dev_err(dev, "device not playing ball -> reset");
+ msleep(ADIS16201_STARTUP_DELAY);
+ ret = adis16201_check_status(dev);
+ if (ret) {
+ dev_err(dev, "giving up");
+ goto err_ret;
+ }
+ }
+
+ printk(KERN_INFO DRIVER_NAME ": at CS%d (irq %d)\n",
+ st->us->chip_select, st->us->irq);
+
+err_ret:
+ return ret;
+}
+
+static IIO_DEV_ATTR_IN_NAMED_RAW(0, supply, adis16201_read_12bit_unsigned,
+ ADIS16201_SUPPLY_OUT);
+static IIO_CONST_ATTR(in0_supply_scale, "0.00122");
+static IIO_DEV_ATTR_IN_RAW(1, adis16201_read_12bit_unsigned,
+ ADIS16201_AUX_ADC);
+static IIO_CONST_ATTR(in1_scale, "0.00061");
+
+static IIO_DEV_ATTR_ACCEL_X(adis16201_read_14bit_signed,
+ ADIS16201_XACCL_OUT);
+static IIO_DEV_ATTR_ACCEL_Y(adis16201_read_14bit_signed,
+ ADIS16201_YACCL_OUT);
+static IIO_DEV_ATTR_ACCEL_X_OFFSET(S_IWUSR | S_IRUGO,
+ adis16201_read_12bit_signed,
+ adis16201_write_16bit,
+ ADIS16201_XACCL_OFFS);
+static IIO_DEV_ATTR_ACCEL_Y_OFFSET(S_IWUSR | S_IRUGO,
+ adis16201_read_12bit_signed,
+ adis16201_write_16bit,
+ ADIS16201_YACCL_OFFS);
+static IIO_CONST_ATTR(accel_scale, "0.4625");
+
+static IIO_DEV_ATTR_INCLI_X(adis16201_read_14bit_signed,
+ ADIS16201_XINCL_OUT);
+static IIO_DEV_ATTR_INCLI_Y(adis16201_read_14bit_signed,
+ ADIS16201_YINCL_OUT);
+static IIO_DEV_ATTR_INCLI_X_OFFSET(S_IWUSR | S_IRUGO,
+ adis16201_read_9bit_signed,
+ adis16201_write_16bit,
+ ADIS16201_XACCL_OFFS);
+static IIO_DEV_ATTR_INCLI_Y_OFFSET(S_IWUSR | S_IRUGO,
+ adis16201_read_9bit_signed,
+ adis16201_write_16bit,
+ ADIS16201_YACCL_OFFS);
+static IIO_CONST_ATTR(incli_scale, "0.1");
+
+static IIO_DEV_ATTR_TEMP_RAW(adis16201_read_temp);
+static IIO_CONST_ATTR(temp_offset, "25");
+static IIO_CONST_ATTR(temp_scale, "-0.47");
+
+static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, adis16201_write_reset, 0);
+
+static IIO_CONST_ATTR(name, "adis16201");
+
+static struct attribute *adis16201_event_attributes[] = {
+ NULL
+};
+
+static struct attribute_group adis16201_event_attribute_group = {
+ .attrs = adis16201_event_attributes,
+};
+
+static struct attribute *adis16201_attributes[] = {
+ &iio_dev_attr_in0_supply_raw.dev_attr.attr,
+ &iio_const_attr_in0_supply_scale.dev_attr.attr,
+ &iio_dev_attr_temp_raw.dev_attr.attr,
+ &iio_const_attr_temp_offset.dev_attr.attr,
+ &iio_const_attr_temp_scale.dev_attr.attr,
+ &iio_dev_attr_reset.dev_attr.attr,
+ &iio_const_attr_name.dev_attr.attr,
+ &iio_dev_attr_in1_raw.dev_attr.attr,
+ &iio_const_attr_in1_scale.dev_attr.attr,
+ &iio_dev_attr_accel_x_raw.dev_attr.attr,
+ &iio_dev_attr_accel_y_raw.dev_attr.attr,
+ &iio_dev_attr_accel_x_offset.dev_attr.attr,
+ &iio_dev_attr_accel_y_offset.dev_attr.attr,
+ &iio_const_attr_accel_scale.dev_attr.attr,
+ &iio_dev_attr_incli_x_raw.dev_attr.attr,
+ &iio_dev_attr_incli_y_raw.dev_attr.attr,
+ &iio_dev_attr_incli_x_offset.dev_attr.attr,
+ &iio_dev_attr_incli_y_offset.dev_attr.attr,
+ &iio_const_attr_incli_scale.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group adis16201_attribute_group = {
+ .attrs = adis16201_attributes,
+};
+
+static int __devinit adis16201_probe(struct spi_device *spi)
+{
+ int ret, regdone = 0;
+ struct adis16201_state *st = kzalloc(sizeof *st, GFP_KERNEL);
+ if (!st) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ /* this is only used for removal purposes */
+ spi_set_drvdata(spi, st);
+
+ /* Allocate the comms buffers */
+ st->rx = kzalloc(sizeof(*st->rx)*ADIS16201_MAX_RX, GFP_KERNEL);
+ if (st->rx == NULL) {
+ ret = -ENOMEM;
+ goto error_free_st;
+ }
+ st->tx = kzalloc(sizeof(*st->tx)*ADIS16201_MAX_TX, GFP_KERNEL);
+ if (st->tx == NULL) {
+ ret = -ENOMEM;
+ goto error_free_rx;
+ }
+ st->us = spi;
+ mutex_init(&st->buf_lock);
+ /* setup the industrialio driver allocated elements */
+ st->indio_dev = iio_allocate_device();
+ if (st->indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_free_tx;
+ }
+
+ st->indio_dev->dev.parent = &spi->dev;
+ st->indio_dev->num_interrupt_lines = 1;
+ st->indio_dev->event_attrs = &adis16201_event_attribute_group;
+ st->indio_dev->attrs = &adis16201_attribute_group;
+ st->indio_dev->dev_data = (void *)(st);
+ st->indio_dev->driver_module = THIS_MODULE;
+ st->indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = adis16201_configure_ring(st->indio_dev);
+ if (ret)
+ goto error_free_dev;
+
+ ret = iio_device_register(st->indio_dev);
+ if (ret)
+ goto error_unreg_ring_funcs;
+ regdone = 1;
+
+ ret = adis16201_initialize_ring(st->indio_dev->ring);
+ if (ret) {
+ printk(KERN_ERR "failed to initialize the ring\n");
+ goto error_unreg_ring_funcs;
+ }
+
+ if (spi->irq) {
+ ret = iio_register_interrupt_line(spi->irq,
+ st->indio_dev,
+ 0,
+ IRQF_TRIGGER_RISING,
+ "adis16201");
+ if (ret)
+ goto error_uninitialize_ring;
+
+ ret = adis16201_probe_trigger(st->indio_dev);
+ if (ret)
+ goto error_unregister_line;
+ }
+
+ /* Get the device into a sane initial state */
+ ret = adis16201_initial_setup(st);
+ if (ret)
+ goto error_remove_trigger;
+ return 0;
+
+error_remove_trigger:
+ adis16201_remove_trigger(st->indio_dev);
+error_unregister_line:
+ if (spi->irq)
+ iio_unregister_interrupt_line(st->indio_dev, 0);
+error_uninitialize_ring:
+ adis16201_uninitialize_ring(st->indio_dev->ring);
+error_unreg_ring_funcs:
+ adis16201_unconfigure_ring(st->indio_dev);
+error_free_dev:
+ if (regdone)
+ iio_device_unregister(st->indio_dev);
+ else
+ iio_free_device(st->indio_dev);
+error_free_tx:
+ kfree(st->tx);
+error_free_rx:
+ kfree(st->rx);
+error_free_st:
+ kfree(st);
+error_ret:
+ return ret;
+}
+
+static int adis16201_remove(struct spi_device *spi)
+{
+ struct adis16201_state *st = spi_get_drvdata(spi);
+ struct iio_dev *indio_dev = st->indio_dev;
+
+ flush_scheduled_work();
+
+ adis16201_remove_trigger(indio_dev);
+ if (spi->irq)
+ iio_unregister_interrupt_line(indio_dev, 0);
+
+ adis16201_uninitialize_ring(indio_dev->ring);
+ iio_device_unregister(indio_dev);
+ adis16201_unconfigure_ring(indio_dev);
+ kfree(st->tx);
+ kfree(st->rx);
+ kfree(st);
+
+ return 0;
+}
+
+static struct spi_driver adis16201_driver = {
+ .driver = {
+ .name = "adis16201",
+ .owner = THIS_MODULE,
+ },
+ .probe = adis16201_probe,
+ .remove = __devexit_p(adis16201_remove),
+};
+
+static __init int adis16201_init(void)
+{
+ return spi_register_driver(&adis16201_driver);
+}
+module_init(adis16201_init);
+
+static __exit void adis16201_exit(void)
+{
+ spi_unregister_driver(&adis16201_driver);
+}
+module_exit(adis16201_exit);
+
+MODULE_AUTHOR("Barry Song <21cnbao at gmail.com>");
+MODULE_DESCRIPTION("Analog Devices ADIS16201 Programmable Digital Vibration Sensor driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/staging/iio/accel/adis16201_ring.c b/drivers/staging/iio/accel/adis16201_ring.c
new file mode 100644
index 0000000..e6870a2
--- /dev/null
+++ b/drivers/staging/iio/accel/adis16201_ring.c
@@ -0,0 +1,218 @@
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/workqueue.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+#include "../ring_sw.h"
+#include "accel.h"
+#include "../trigger.h"
+#include "adis16201.h"
+
+static IIO_SCAN_EL_C(in_supply, ADIS16201_SCAN_SUPPLY, ADIS16201_SUPPLY_OUT, NULL);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(in_supply, u, 12, 16);
+static IIO_SCAN_EL_C(accel_x, ADIS16201_SCAN_ACC_X, ADIS16201_XACCL_OUT, NULL);
+static IIO_SCAN_EL_C(accel_y, ADIS16201_SCAN_ACC_Y, ADIS16201_YACCL_OUT, NULL);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(accel, s, 14, 16);
+static IIO_SCAN_EL_C(in0, ADIS16201_SCAN_AUX_ADC, ADIS16201_AUX_ADC, NULL);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(in0, u, 12, 16);
+static IIO_SCAN_EL_C(temp, ADIS16201_SCAN_TEMP, ADIS16201_TEMP_OUT, NULL);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(temp, u, 12, 16);
+static IIO_SCAN_EL_C(incli_x, ADIS16201_SCAN_INCLI_X,
+ ADIS16201_XINCL_OUT, NULL);
+static IIO_SCAN_EL_C(incli_y, ADIS16201_SCAN_INCLI_Y,
+ ADIS16201_YINCL_OUT, NULL);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(incli, s, 14, 16);
+static IIO_SCAN_EL_TIMESTAMP(7);
+static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64);
+
+static struct attribute *adis16201_scan_el_attrs[] = {
+ &iio_scan_el_in_supply.dev_attr.attr,
+ &iio_const_attr_in_supply_index.dev_attr.attr,
+ &iio_const_attr_in_supply_type.dev_attr.attr,
+ &iio_scan_el_accel_x.dev_attr.attr,
+ &iio_const_attr_accel_x_index.dev_attr.attr,
+ &iio_scan_el_accel_y.dev_attr.attr,
+ &iio_const_attr_accel_y_index.dev_attr.attr,
+ &iio_const_attr_accel_type.dev_attr.attr,
+ &iio_scan_el_in0.dev_attr.attr,
+ &iio_const_attr_in0_index.dev_attr.attr,
+ &iio_const_attr_in0_type.dev_attr.attr,
+ &iio_scan_el_temp.dev_attr.attr,
+ &iio_const_attr_temp_index.dev_attr.attr,
+ &iio_const_attr_temp_type.dev_attr.attr,
+ &iio_scan_el_incli_x.dev_attr.attr,
+ &iio_const_attr_incli_x_index.dev_attr.attr,
+ &iio_scan_el_incli_y.dev_attr.attr,
+ &iio_const_attr_incli_y_index.dev_attr.attr,
+ &iio_const_attr_incli_type.dev_attr.attr,
+ &iio_scan_el_timestamp.dev_attr.attr,
+ &iio_const_attr_timestamp_index.dev_attr.attr,
+ &iio_const_attr_timestamp_type.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group adis16201_scan_el_group = {
+ .attrs = adis16201_scan_el_attrs,
+ .name = "scan_elements",
+};
+
+/**
+ * adis16201_poll_func_th() top half interrupt handler called by trigger
+ * @private_data: iio_dev
+ **/
+static void adis16201_poll_func_th(struct iio_dev *indio_dev, s64 time)
+{
+ struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
+ st->last_timestamp = time;
+ schedule_work(&st->work_trigger_to_ring);
+}
+
+/**
+ * adis16201_read_ring_data() read data registers which will be placed into ring
+ * @dev: device associated with child of actual device (iio_dev or iio_trig)
+ * @rx: somewhere to pass back the value read
+ **/
+static int adis16201_read_ring_data(struct device *dev, u8 *rx)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct adis16201_state *st = iio_dev_get_devdata(indio_dev);
+ struct spi_transfer xfers[ADIS16201_OUTPUTS + 1];
+ int ret;
+ int i;
+
+ mutex_lock(&st->buf_lock);
+
+ spi_message_init(&msg);
+
+ memset(xfers, 0, sizeof(xfers));
+ for (i = 0; i <= ADIS16201_OUTPUTS; i++) {
+ xfers[i].bits_per_word = 8;
+ xfers[i].cs_change = 1;
+ xfers[i].len = 2;
+ xfers[i].delay_usecs = 20;
+ xfers[i].tx_buf = st->tx + 2 * i;
+ st->tx[2 * i] = ADIS16201_READ_REG(ADIS16201_SUPPLY_OUT + 2 * i);
+ st->tx[2 * i + 1] = 0;
+ if (i >= 1)
+ xfers[i].rx_buf = rx + 2 * (i - 1);
+ spi_message_add_tail(&xfers[i], &msg);
+ }
+
+ ret = spi_sync(st->us, &msg);
+ if (ret)
+ dev_err(&st->us->dev, "problem when burst reading");
+
+ mutex_unlock(&st->buf_lock);
+
+ return ret;
+}
+
+/* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
+ * specific to be rolled into the core.
+ */
+static void adis16201_trigger_bh_to_ring(struct work_struct *work_s)
+{
+ struct adis16201_state *st
+ = container_of(work_s, struct adis16201_state,
+ work_trigger_to_ring);
+ struct iio_ring_buffer *ring = st->indio_dev->ring;
+
+ int i = 0;
+ s16 *data;
+ size_t datasize = ring->access.get_bytes_per_datum(ring);
+
+ data = kmalloc(datasize, GFP_KERNEL);
+ if (data == NULL) {
+ dev_err(&st->us->dev, "memory alloc failed in ring bh");
+ return;
+ }
+
+ if (ring->scan_count)
+ if (adis16201_read_ring_data(&st->indio_dev->dev, st->rx) >= 0)
+ for (; i < ring->scan_count; i++)
+ data[i] = be16_to_cpup(
+ (__be16 *)&(st->rx[i*2]));
+
+ /* Guaranteed to be aligned with 8 byte boundary */
+ if (ring->scan_timestamp)
+ *((s64 *)(data + ((i + 3)/4)*4)) = st->last_timestamp;
+
+ ring->access.store_to(ring,
+ (u8 *)data,
+ st->last_timestamp);
+
+ iio_trigger_notify_done(st->indio_dev->trig);
+ kfree(data);
+
+ return;
+}
+
+void adis16201_unconfigure_ring(struct iio_dev *indio_dev)
+{
+ kfree(indio_dev->pollfunc);
+ iio_sw_rb_free(indio_dev->ring);
+}
+
+int adis16201_configure_ring(struct iio_dev *indio_dev)
+{
+ int ret = 0;
+ struct adis16201_state *st = indio_dev->dev_data;
+ struct iio_ring_buffer *ring;
+ INIT_WORK(&st->work_trigger_to_ring, adis16201_trigger_bh_to_ring);
+
+ ring = iio_sw_rb_allocate(indio_dev);
+ if (!ring) {
+ ret = -ENOMEM;
+ return ret;
+ }
+ indio_dev->ring = ring;
+ /* Effectively select the ring buffer implementation */
+ iio_ring_sw_register_funcs(&ring->access);
+ ring->bpe = 2;
+ ring->scan_el_attrs = &adis16201_scan_el_group;
+ ring->scan_timestamp = true;
+ ring->preenable = &iio_sw_ring_preenable;
+ ring->postenable = &iio_triggered_ring_postenable;
+ ring->predisable = &iio_triggered_ring_predisable;
+ ring->owner = THIS_MODULE;
+
+ /* Set default scan mode */
+ iio_scan_mask_set(ring, iio_scan_el_in_supply.number);
+ iio_scan_mask_set(ring, iio_scan_el_accel_x.number);
+ iio_scan_mask_set(ring, iio_scan_el_accel_y.number);
+ iio_scan_mask_set(ring, iio_scan_el_temp.number);
+ iio_scan_mask_set(ring, iio_scan_el_in0.number);
+ iio_scan_mask_set(ring, iio_scan_el_incli_x.number);
+ iio_scan_mask_set(ring, iio_scan_el_incli_y.number);
+
+ ret = iio_alloc_pollfunc(indio_dev, NULL, &adis16201_poll_func_th);
+ if (ret)
+ goto error_iio_sw_rb_free;
+
+ indio_dev->modes |= INDIO_RING_TRIGGERED;
+ return 0;
+
+error_iio_sw_rb_free:
+ iio_sw_rb_free(indio_dev->ring);
+ return ret;
+}
+
+int adis16201_initialize_ring(struct iio_ring_buffer *ring)
+{
+ return iio_ring_buffer_register(ring, 0);
+}
+
+void adis16201_uninitialize_ring(struct iio_ring_buffer *ring)
+{
+ iio_ring_buffer_unregister(ring);
+}
diff --git a/drivers/staging/iio/accel/adis16201_trigger.c b/drivers/staging/iio/accel/adis16201_trigger.c
new file mode 100644
index 0000000..8a9cea19
--- /dev/null
+++ b/drivers/staging/iio/accel/adis16201_trigger.c
@@ -0,0 +1,122 @@
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/spi/spi.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+#include "../trigger.h"
+#include "adis16201.h"
+
+/**
+ * adis16201_data_rdy_trig_poll() the event handler for the data rdy trig
+ **/
+static int adis16201_data_rdy_trig_poll(struct iio_dev *dev_info,
+ int index,
+ s64 timestamp,
+ int no_test)
+{
+ struct adis16201_state *st = iio_dev_get_devdata(dev_info);
+ struct iio_trigger *trig = st->trig;
+
+ iio_trigger_poll(trig, timestamp);
+
+ return IRQ_HANDLED;
+}
+
+IIO_EVENT_SH(data_rdy_trig, &adis16201_data_rdy_trig_poll);
+
+static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
+
+static struct attribute *adis16201_trigger_attrs[] = {
+ &dev_attr_name.attr,
+ NULL,
+};
+
+static const struct attribute_group adis16201_trigger_attr_group = {
+ .attrs = adis16201_trigger_attrs,
+};
+
+/**
+ * adis16201_data_rdy_trigger_set_state() set datardy interrupt state
+ **/
+static int adis16201_data_rdy_trigger_set_state(struct iio_trigger *trig,
+ bool state)
+{
+ struct adis16201_state *st = trig->private_data;
+ struct iio_dev *indio_dev = st->indio_dev;
+ int ret = 0;
+
+ dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state);
+ ret = adis16201_set_irq(&st->indio_dev->dev, state);
+ if (state == false) {
+ iio_remove_event_from_list(&iio_event_data_rdy_trig,
+ &indio_dev->interrupts[0]
+ ->ev_list);
+ flush_scheduled_work();
+ } else {
+ iio_add_event_to_list(&iio_event_data_rdy_trig,
+ &indio_dev->interrupts[0]->ev_list);
+ }
+ return ret;
+}
+
+/**
+ * adis16201_trig_try_reen() try renabling irq for data rdy trigger
+ * @trig: the datardy trigger
+ **/
+static int adis16201_trig_try_reen(struct iio_trigger *trig)
+{
+ struct adis16201_state *st = trig->private_data;
+ enable_irq(st->us->irq);
+ return 0;
+}
+
+int adis16201_probe_trigger(struct iio_dev *indio_dev)
+{
+ int ret;
+ struct adis16201_state *st = indio_dev->dev_data;
+
+ st->trig = iio_allocate_trigger();
+ st->trig->name = kasprintf(GFP_KERNEL,
+ "adis16201-dev%d",
+ indio_dev->id);
+ if (!st->trig->name) {
+ ret = -ENOMEM;
+ goto error_free_trig;
+ }
+ st->trig->dev.parent = &st->us->dev;
+ st->trig->owner = THIS_MODULE;
+ st->trig->private_data = st;
+ st->trig->set_trigger_state = &adis16201_data_rdy_trigger_set_state;
+ st->trig->try_reenable = &adis16201_trig_try_reen;
+ st->trig->control_attrs = &adis16201_trigger_attr_group;
+ ret = iio_trigger_register(st->trig);
+
+ /* select default trigger */
+ indio_dev->trig = st->trig;
+ if (ret)
+ goto error_free_trig_name;
+
+ return 0;
+
+error_free_trig_name:
+ kfree(st->trig->name);
+error_free_trig:
+ iio_free_trigger(st->trig);
+
+ return ret;
+}
+
+void adis16201_remove_trigger(struct iio_dev *indio_dev)
+{
+ struct adis16201_state *state = indio_dev->dev_data;
+
+ iio_trigger_unregister(state->trig);
+ kfree(state->trig->name);
+ iio_free_trigger(state->trig);
+}
--
1.7.3.2
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