[PATCH 113/510] staging: iio: meter: new driver for ADE7754 devices
Greg Kroah-Hartman
gregkh at suse.de
Mon Jan 10 20:37:17 UTC 2011
From: Barry Song <barry.song at analog.com>
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/meter/Kconfig | 7 +
drivers/staging/iio/meter/Makefile | 1 +
drivers/staging/iio/meter/ade7754.c | 756 +++++++++++++++++++++++++++++++++++
drivers/staging/iio/meter/ade7754.h | 161 ++++++++
4 files changed, 925 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/iio/meter/ade7754.c
create mode 100644 drivers/staging/iio/meter/ade7754.h
diff --git a/drivers/staging/iio/meter/Kconfig b/drivers/staging/iio/meter/Kconfig
index 0c09c39..19f20f4 100644
--- a/drivers/staging/iio/meter/Kconfig
+++ b/drivers/staging/iio/meter/Kconfig
@@ -9,3 +9,10 @@ config ADE7753
help
Say yes here to build support for Analog Devices ADE7753 Single-Phase Multifunction
Metering IC with di/dt Sensor Interface.
+
+config ADE7754
+ tristate "Analog Devices ADE7754 Polyphase Multifunction Energy Metering IC Driver"
+ depends on SPI
+ help
+ Say yes here to build support for Analog Devices ADE7754 Polyphase
+ Multifunction Energy Metering IC Driver.
diff --git a/drivers/staging/iio/meter/Makefile b/drivers/staging/iio/meter/Makefile
index b4eac38..7f65b99 100644
--- a/drivers/staging/iio/meter/Makefile
+++ b/drivers/staging/iio/meter/Makefile
@@ -3,3 +3,4 @@
#
obj-$(CONFIG_ADE7753) += ade7753.o
+obj-$(CONFIG_ADE7754) += ade7754.o
diff --git a/drivers/staging/iio/meter/ade7754.c b/drivers/staging/iio/meter/ade7754.c
new file mode 100644
index 0000000..23dedfa
--- /dev/null
+++ b/drivers/staging/iio/meter/ade7754.c
@@ -0,0 +1,756 @@
+/*
+ * ADE7754 Polyphase Multifunction Energy Metering IC 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 "meter.h"
+#include "ade7754.h"
+
+static int ade7754_spi_write_reg_8(struct device *dev,
+ u8 reg_address,
+ u8 val)
+{
+ int ret;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADE7754_WRITE_REG(reg_address);
+ st->tx[1] = val;
+
+ ret = spi_write(st->us, st->tx, 2);
+ mutex_unlock(&st->buf_lock);
+
+ return ret;
+}
+
+static int ade7754_spi_write_reg_16(struct device *dev,
+ u8 reg_address,
+ u16 value)
+{
+ int ret;
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .bits_per_word = 8,
+ .len = 3,
+ }
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADE7754_WRITE_REG(reg_address);
+ st->tx[1] = (value >> 8) & 0xFF;
+ st->tx[2] = value & 0xFF;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->us, &msg);
+ mutex_unlock(&st->buf_lock);
+
+ return ret;
+}
+
+static int ade7754_spi_read_reg_8(struct device *dev,
+ u8 reg_address,
+ u8 *val)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
+ int ret;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .rx_buf = st->rx,
+ .bits_per_word = 8,
+ .len = 2,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADE7754_READ_REG(reg_address);
+ st->tx[1] = 0;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->us, &msg);
+ if (ret) {
+ dev_err(&st->us->dev, "problem when reading 8 bit register 0x%02X",
+ reg_address);
+ goto error_ret;
+ }
+ *val = st->rx[1];
+
+error_ret:
+ mutex_unlock(&st->buf_lock);
+ return ret;
+}
+
+static int ade7754_spi_read_reg_16(struct device *dev,
+ u8 reg_address,
+ u16 *val)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
+ int ret;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .rx_buf = st->rx,
+ .bits_per_word = 8,
+ .len = 3,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADE7754_READ_REG(reg_address);
+ st->tx[1] = 0;
+ st->tx[2] = 0;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->us, &msg);
+ if (ret) {
+ dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
+ reg_address);
+ goto error_ret;
+ }
+ *val = (st->rx[1] << 8) | st->rx[2];
+
+error_ret:
+ mutex_unlock(&st->buf_lock);
+ return ret;
+}
+
+static int ade7754_spi_read_reg_24(struct device *dev,
+ u8 reg_address,
+ u32 *val)
+{
+ struct spi_message msg;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
+ int ret;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = st->tx,
+ .rx_buf = st->rx,
+ .bits_per_word = 8,
+ .len = 4,
+ },
+ };
+
+ mutex_lock(&st->buf_lock);
+ st->tx[0] = ADE7754_READ_REG(reg_address);
+ st->tx[1] = 0;
+ st->tx[2] = 0;
+ st->tx[3] = 0;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(xfers, &msg);
+ ret = spi_sync(st->us, &msg);
+ if (ret) {
+ dev_err(&st->us->dev, "problem when reading 24 bit register 0x%02X",
+ reg_address);
+ goto error_ret;
+ }
+ *val = (st->rx[1] << 16) | (st->rx[2] << 8) | st->rx[3];
+
+error_ret:
+ mutex_unlock(&st->buf_lock);
+ return ret;
+}
+
+static ssize_t ade7754_read_8bit(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 val = 0;
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+
+ ret = ade7754_spi_read_reg_8(dev, this_attr->address, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%u\n", val);
+}
+
+static ssize_t ade7754_read_16bit(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 = ade7754_spi_read_reg_16(dev, this_attr->address, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%u\n", val);
+}
+
+static ssize_t ade7754_read_24bit(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u32 val = 0;
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+
+ ret = ade7754_spi_read_reg_24(dev, this_attr->address, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%u\n", val & 0xFFFFFF);
+}
+
+static ssize_t ade7754_write_8bit(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 = ade7754_spi_write_reg_8(dev, this_attr->address, val);
+
+error_ret:
+ return ret ? ret : len;
+}
+
+static ssize_t ade7754_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 = ade7754_spi_write_reg_16(dev, this_attr->address, val);
+
+error_ret:
+ return ret ? ret : len;
+}
+
+static int ade7754_reset(struct device *dev)
+{
+ int ret;
+ u8 val;
+ ade7754_spi_read_reg_8(dev,
+ ADE7754_OPMODE,
+ &val);
+ val |= 1 << 6; /* Software Chip Reset */
+ ret = ade7754_spi_write_reg_8(dev,
+ ADE7754_OPMODE,
+ val);
+
+ return ret;
+}
+
+
+static ssize_t ade7754_write_reset(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ if (len < 1)
+ return -1;
+ switch (buf[0]) {
+ case '1':
+ case 'y':
+ case 'Y':
+ return ade7754_reset(dev);
+ }
+ return -1;
+}
+
+static IIO_DEV_ATTR_AENERGY(ade7754_read_24bit, ADE7754_AENERGY);
+static IIO_DEV_ATTR_LAENERGY(ade7754_read_24bit, ADE7754_LAENERGY);
+static IIO_DEV_ATTR_VAENERGY(ade7754_read_24bit, ADE7754_VAENERGY);
+static IIO_DEV_ATTR_LVAENERGY(ade7754_read_24bit, ADE7754_LVAENERGY);
+static IIO_DEV_ATTR_VPEAK(S_IWUSR | S_IRUGO,
+ ade7754_read_8bit,
+ ade7754_write_8bit,
+ ADE7754_VPEAK);
+static IIO_DEV_ATTR_IPEAK(S_IWUSR | S_IRUGO,
+ ade7754_read_8bit,
+ ade7754_write_8bit,
+ ADE7754_VPEAK);
+static IIO_DEV_ATTR_APHCAL(S_IWUSR | S_IRUGO,
+ ade7754_read_8bit,
+ ade7754_write_8bit,
+ ADE7754_APHCAL);
+static IIO_DEV_ATTR_BPHCAL(S_IWUSR | S_IRUGO,
+ ade7754_read_8bit,
+ ade7754_write_8bit,
+ ADE7754_BPHCAL);
+static IIO_DEV_ATTR_CPHCAL(S_IWUSR | S_IRUGO,
+ ade7754_read_8bit,
+ ade7754_write_8bit,
+ ADE7754_CPHCAL);
+static IIO_DEV_ATTR_AAPOS(S_IWUSR | S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_AAPOS);
+static IIO_DEV_ATTR_BAPOS(S_IWUSR | S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_BAPOS);
+static IIO_DEV_ATTR_CAPOS(S_IWUSR | S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_CAPOS);
+static IIO_DEV_ATTR_WDIV(S_IWUSR | S_IRUGO,
+ ade7754_read_8bit,
+ ade7754_write_8bit,
+ ADE7754_WDIV);
+static IIO_DEV_ATTR_VADIV(S_IWUSR | S_IRUGO,
+ ade7754_read_8bit,
+ ade7754_write_8bit,
+ ADE7754_VADIV);
+static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_CFNUM);
+static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_CFDEN);
+static IIO_DEV_ATTR_ACTIVE_POWER_A_GAIN(S_IWUSR | S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_AAPGAIN);
+static IIO_DEV_ATTR_ACTIVE_POWER_B_GAIN(S_IWUSR | S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_BAPGAIN);
+static IIO_DEV_ATTR_ACTIVE_POWER_C_GAIN(S_IWUSR | S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_CAPGAIN);
+static IIO_DEV_ATTR_AIRMS(S_IRUGO,
+ ade7754_read_24bit,
+ NULL,
+ ADE7754_AIRMS);
+static IIO_DEV_ATTR_BIRMS(S_IRUGO,
+ ade7754_read_24bit,
+ NULL,
+ ADE7754_BIRMS);
+static IIO_DEV_ATTR_CIRMS(S_IRUGO,
+ ade7754_read_24bit,
+ NULL,
+ ADE7754_CIRMS);
+static IIO_DEV_ATTR_AVRMS(S_IRUGO,
+ ade7754_read_24bit,
+ NULL,
+ ADE7754_AVRMS);
+static IIO_DEV_ATTR_BVRMS(S_IRUGO,
+ ade7754_read_24bit,
+ NULL,
+ ADE7754_BVRMS);
+static IIO_DEV_ATTR_CVRMS(S_IRUGO,
+ ade7754_read_24bit,
+ NULL,
+ ADE7754_CVRMS);
+static IIO_DEV_ATTR_AIRMSOS(S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_AIRMSOS);
+static IIO_DEV_ATTR_BIRMSOS(S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_BIRMSOS);
+static IIO_DEV_ATTR_CIRMSOS(S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_CIRMSOS);
+static IIO_DEV_ATTR_AVRMSOS(S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_AVRMSOS);
+static IIO_DEV_ATTR_BVRMSOS(S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_BVRMSOS);
+static IIO_DEV_ATTR_CVRMSOS(S_IRUGO,
+ ade7754_read_16bit,
+ ade7754_write_16bit,
+ ADE7754_CVRMSOS);
+
+static int ade7754_set_irq(struct device *dev, bool enable)
+{
+ int ret;
+ u16 irqen;
+ ret = ade7754_spi_read_reg_16(dev, ADE7754_IRQEN, &irqen);
+ if (ret)
+ goto error_ret;
+
+ if (enable)
+ irqen |= 1 << 14; /* Enables an interrupt when a data is
+ present in the waveform register */
+ else
+ irqen &= ~(1 << 14);
+
+ ret = ade7754_spi_write_reg_16(dev, ADE7754_IRQEN, irqen);
+ if (ret)
+ goto error_ret;
+
+error_ret:
+ return ret;
+}
+
+/* Power down the device */
+static int ade7754_stop_device(struct device *dev)
+{
+ int ret;
+ u8 val;
+ ade7754_spi_read_reg_8(dev,
+ ADE7754_OPMODE,
+ &val);
+ val |= 7 << 3; /* ADE7754 powered down */
+ ret = ade7754_spi_write_reg_8(dev,
+ ADE7754_OPMODE,
+ val);
+
+ return ret;
+}
+
+static int ade7754_initial_setup(struct ade7754_state *st)
+{
+ int ret;
+ struct device *dev = &st->indio_dev->dev;
+
+ /* use low spi speed for init */
+ st->us->mode = SPI_MODE_3;
+ spi_setup(st->us);
+
+ /* Disable IRQ */
+ ret = ade7754_set_irq(dev, false);
+ if (ret) {
+ dev_err(dev, "disable irq failed");
+ goto err_ret;
+ }
+
+ ade7754_reset(dev);
+ msleep(ADE7754_STARTUP_DELAY);
+
+err_ret:
+ return ret;
+}
+
+static ssize_t ade7754_read_frequency(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret, len = 0;
+ u8 t;
+ int sps;
+ ret = ade7754_spi_read_reg_8(dev,
+ ADE7754_WAVMODE,
+ &t);
+ if (ret)
+ return ret;
+
+ t = (t >> 3) & 0x3;
+ sps = 26000 / (1 + t);
+
+ len = sprintf(buf, "%d SPS\n", sps);
+ return len;
+}
+
+static ssize_t ade7754_write_frequency(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ade7754_state *st = iio_dev_get_devdata(indio_dev);
+ unsigned long val;
+ int ret;
+ u8 reg, t;
+
+ ret = strict_strtol(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ mutex_lock(&indio_dev->mlock);
+
+ t = (26000 / val);
+ if (t > 0)
+ t--;
+
+ if (t > 1)
+ st->us->max_speed_hz = ADE7754_SPI_SLOW;
+ else
+ st->us->max_speed_hz = ADE7754_SPI_FAST;
+
+ ret = ade7754_spi_read_reg_8(dev,
+ ADE7754_WAVMODE,
+ ®);
+ if (ret)
+ goto out;
+
+ reg &= ~(3 << 3);
+ reg |= t << 3;
+
+ ret = ade7754_spi_write_reg_8(dev,
+ ADE7754_WAVMODE,
+ reg);
+
+out:
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret ? ret : len;
+}
+static IIO_DEV_ATTR_TEMP_RAW(ade7754_read_8bit);
+static IIO_CONST_ATTR(temp_offset, "129 C");
+static IIO_CONST_ATTR(temp_scale, "4 C");
+
+static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
+ ade7754_read_frequency,
+ ade7754_write_frequency);
+
+static IIO_DEV_ATTR_RESET(ade7754_write_reset);
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("26000 13000 65000 33000");
+
+static IIO_CONST_ATTR(name, "ade7754");
+
+static struct attribute *ade7754_event_attributes[] = {
+ NULL
+};
+
+static struct attribute_group ade7754_event_attribute_group = {
+ .attrs = ade7754_event_attributes,
+};
+
+static struct attribute *ade7754_attributes[] = {
+ &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_sampling_frequency.dev_attr.attr,
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ &iio_dev_attr_reset.dev_attr.attr,
+ &iio_const_attr_name.dev_attr.attr,
+ &iio_dev_attr_aenergy.dev_attr.attr,
+ &iio_dev_attr_laenergy.dev_attr.attr,
+ &iio_dev_attr_vaenergy.dev_attr.attr,
+ &iio_dev_attr_lvaenergy.dev_attr.attr,
+ &iio_dev_attr_vpeak.dev_attr.attr,
+ &iio_dev_attr_ipeak.dev_attr.attr,
+ &iio_dev_attr_aphcal.dev_attr.attr,
+ &iio_dev_attr_bphcal.dev_attr.attr,
+ &iio_dev_attr_cphcal.dev_attr.attr,
+ &iio_dev_attr_aapos.dev_attr.attr,
+ &iio_dev_attr_bapos.dev_attr.attr,
+ &iio_dev_attr_capos.dev_attr.attr,
+ &iio_dev_attr_wdiv.dev_attr.attr,
+ &iio_dev_attr_vadiv.dev_attr.attr,
+ &iio_dev_attr_cfnum.dev_attr.attr,
+ &iio_dev_attr_cfden.dev_attr.attr,
+ &iio_dev_attr_active_power_a_gain.dev_attr.attr,
+ &iio_dev_attr_active_power_b_gain.dev_attr.attr,
+ &iio_dev_attr_active_power_c_gain.dev_attr.attr,
+ &iio_dev_attr_airms.dev_attr.attr,
+ &iio_dev_attr_birms.dev_attr.attr,
+ &iio_dev_attr_cirms.dev_attr.attr,
+ &iio_dev_attr_avrms.dev_attr.attr,
+ &iio_dev_attr_bvrms.dev_attr.attr,
+ &iio_dev_attr_cvrms.dev_attr.attr,
+ &iio_dev_attr_airmsos.dev_attr.attr,
+ &iio_dev_attr_birmsos.dev_attr.attr,
+ &iio_dev_attr_cirmsos.dev_attr.attr,
+ &iio_dev_attr_avrmsos.dev_attr.attr,
+ &iio_dev_attr_bvrmsos.dev_attr.attr,
+ &iio_dev_attr_cvrmsos.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ade7754_attribute_group = {
+ .attrs = ade7754_attributes,
+};
+
+
+
+static int __devinit ade7754_probe(struct spi_device *spi)
+{
+ int ret, regdone = 0;
+ struct ade7754_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)*ADE7754_MAX_RX, GFP_KERNEL);
+ if (st->rx == NULL) {
+ ret = -ENOMEM;
+ goto error_free_st;
+ }
+ st->tx = kzalloc(sizeof(*st->tx)*ADE7754_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 = &ade7754_event_attribute_group;
+ st->indio_dev->attrs = &ade7754_attribute_group;
+ st->indio_dev->dev_data = (void *)(st);
+ st->indio_dev->driver_module = THIS_MODULE;
+ st->indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = ade7754_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 = ade7754_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_FALLING,
+ "ade7754");
+ if (ret)
+ goto error_uninitialize_ring;
+
+ ret = ade7754_probe_trigger(st->indio_dev);
+ if (ret)
+ goto error_unregister_line;
+ }
+
+ /* Get the device into a sane initial state */
+ ret = ade7754_initial_setup(st);
+ if (ret)
+ goto error_remove_trigger;
+ return 0;
+
+error_remove_trigger:
+ if (st->indio_dev->modes & INDIO_RING_TRIGGERED)
+ ade7754_remove_trigger(st->indio_dev);
+error_unregister_line:
+ if (st->indio_dev->modes & INDIO_RING_TRIGGERED)
+ iio_unregister_interrupt_line(st->indio_dev, 0);
+error_uninitialize_ring:
+ ade7754_uninitialize_ring(st->indio_dev->ring);
+error_unreg_ring_funcs:
+ ade7754_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;
+}
+
+/* fixme, confirm ordering in this function */
+static int ade7754_remove(struct spi_device *spi)
+{
+ int ret;
+ struct ade7754_state *st = spi_get_drvdata(spi);
+ struct iio_dev *indio_dev = st->indio_dev;
+
+ ret = ade7754_stop_device(&(indio_dev->dev));
+ if (ret)
+ goto err_ret;
+
+ flush_scheduled_work();
+
+ ade7754_remove_trigger(indio_dev);
+ if (spi->irq)
+ iio_unregister_interrupt_line(indio_dev, 0);
+
+ ade7754_uninitialize_ring(indio_dev->ring);
+ ade7754_unconfigure_ring(indio_dev);
+ iio_device_unregister(indio_dev);
+ kfree(st->tx);
+ kfree(st->rx);
+ kfree(st);
+
+ return 0;
+
+err_ret:
+ return ret;
+}
+
+static struct spi_driver ade7754_driver = {
+ .driver = {
+ .name = "ade7754",
+ .owner = THIS_MODULE,
+ },
+ .probe = ade7754_probe,
+ .remove = __devexit_p(ade7754_remove),
+};
+
+static __init int ade7754_init(void)
+{
+ return spi_register_driver(&ade7754_driver);
+}
+module_init(ade7754_init);
+
+static __exit void ade7754_exit(void)
+{
+ spi_unregister_driver(&ade7754_driver);
+}
+module_exit(ade7754_exit);
+
+MODULE_AUTHOR("Barry Song <21cnbao at gmail.com>");
+MODULE_DESCRIPTION("Analog Devices ADE7754 Polyphase Multifunction Energy Metering IC Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/staging/iio/meter/ade7754.h b/drivers/staging/iio/meter/ade7754.h
new file mode 100644
index 0000000..f6a3e4b
--- /dev/null
+++ b/drivers/staging/iio/meter/ade7754.h
@@ -0,0 +1,161 @@
+#ifndef _ADE7754_H
+#define _ADE7754_H
+
+#define ADE7754_AENERGY 0x01
+#define ADE7754_RAENERGY 0x02
+#define ADE7754_LAENERGY 0x03
+#define ADE7754_VAENERGY 0x04
+#define ADE7754_RVAENERGY 0x05
+#define ADE7754_LVAENERGY 0x06
+#define ADE7754_PERIOD 0x07
+#define ADE7754_TEMP 0x08
+#define ADE7754_WFORM 0x09
+#define ADE7754_OPMODE 0x0A
+#define ADE7754_MMODE 0x0B
+#define ADE7754_WAVMODE 0x0C
+#define ADE7754_WATMODE 0x0D
+#define ADE7754_VAMODE 0x0E
+#define ADE7754_IRQEN 0x0F
+#define ADE7754_STATUS 0x10
+#define ADE7754_RSTATUS 0x11
+#define ADE7754_ZXTOUT 0x12
+#define ADE7754_LINCYC 0x13
+#define ADE7754_SAGCYC 0x14
+#define ADE7754_SAGLVL 0x15
+#define ADE7754_VPEAK 0x16
+#define ADE7754_IPEAK 0x17
+#define ADE7754_GAIN 0x18
+#define ADE7754_AWG 0x19
+#define ADE7754_BWG 0x1A
+#define ADE7754_CWG 0x1B
+#define ADE7754_AVAG 0x1C
+#define ADE7754_BVAG 0x1D
+#define ADE7754_CVAG 0x1E
+#define ADE7754_APHCAL 0x1F
+#define ADE7754_BPHCAL 0x20
+#define ADE7754_CPHCAL 0x21
+#define ADE7754_AAPOS 0x22
+#define ADE7754_BAPOS 0x23
+#define ADE7754_CAPOS 0x24
+#define ADE7754_CFNUM 0x25
+#define ADE7754_CFDEN 0x26
+#define ADE7754_WDIV 0x27
+#define ADE7754_VADIV 0x28
+#define ADE7754_AIRMS 0x29
+#define ADE7754_BIRMS 0x2A
+#define ADE7754_CIRMS 0x2B
+#define ADE7754_AVRMS 0x2C
+#define ADE7754_BVRMS 0x2D
+#define ADE7754_CVRMS 0x2E
+#define ADE7754_AIRMSOS 0x2F
+#define ADE7754_BIRMSOS 0x30
+#define ADE7754_CIRMSOS 0x31
+#define ADE7754_AVRMSOS 0x32
+#define ADE7754_BVRMSOS 0x33
+#define ADE7754_CVRMSOS 0x34
+#define ADE7754_AAPGAIN 0x35
+#define ADE7754_BAPGAIN 0x36
+#define ADE7754_CAPGAIN 0x37
+#define ADE7754_AVGAIN 0x38
+#define ADE7754_BVGAIN 0x39
+#define ADE7754_CVGAIN 0x3A
+#define ADE7754_CHKSUM 0x3E
+#define ADE7754_VERSION 0x3F
+
+#define ADE7754_READ_REG(a) a
+#define ADE7754_WRITE_REG(a) ((a) | 0x80)
+
+#define ADE7754_MAX_TX 4
+#define ADE7754_MAX_RX 4
+#define ADE7754_STARTUP_DELAY 1
+
+#define ADE7754_SPI_SLOW (u32)(300 * 1000)
+#define ADE7754_SPI_BURST (u32)(1000 * 1000)
+#define ADE7754_SPI_FAST (u32)(2000 * 1000)
+
+#define DRIVER_NAME "ade7754"
+
+/**
+ * struct ade7754_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 ade7754_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;
+};
+#if defined(CONFIG_IIO_RING_BUFFER) && defined(THIS_HAS_RING_BUFFER_SUPPORT)
+/* At the moment triggers are only used for ring buffer
+ * filling. This may change!
+ */
+
+enum ade7754_scan {
+ ADE7754_SCAN_PHA_V,
+ ADE7754_SCAN_PHB_V,
+ ADE7754_SCAN_PHC_V,
+ ADE7754_SCAN_PHA_I,
+ ADE7754_SCAN_PHB_I,
+ ADE7754_SCAN_PHC_I,
+};
+
+void ade7754_remove_trigger(struct iio_dev *indio_dev);
+int ade7754_probe_trigger(struct iio_dev *indio_dev);
+
+ssize_t ade7754_read_data_from_ring(struct device *dev,
+ struct device_attribute *attr,
+ char *buf);
+
+
+int ade7754_configure_ring(struct iio_dev *indio_dev);
+void ade7754_unconfigure_ring(struct iio_dev *indio_dev);
+
+int ade7754_initialize_ring(struct iio_ring_buffer *ring);
+void ade7754_uninitialize_ring(struct iio_ring_buffer *ring);
+#else /* CONFIG_IIO_RING_BUFFER */
+
+static inline void ade7754_remove_trigger(struct iio_dev *indio_dev)
+{
+}
+static inline int ade7754_probe_trigger(struct iio_dev *indio_dev)
+{
+ return 0;
+}
+
+static inline ssize_t
+ade7754_read_data_from_ring(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return 0;
+}
+
+static int ade7754_configure_ring(struct iio_dev *indio_dev)
+{
+ return 0;
+}
+static inline void ade7754_unconfigure_ring(struct iio_dev *indio_dev)
+{
+}
+static inline int ade7754_initialize_ring(struct iio_ring_buffer *ring)
+{
+ return 0;
+}
+static inline void ade7754_uninitialize_ring(struct iio_ring_buffer *ring)
+{
+}
+#endif /* CONFIG_IIO_RING_BUFFER */
+
+#endif
--
1.7.3.2
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