--- /dev/null
+/*
+ * AD774X capacitive sensor driver supporting AD7745/6/7
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/workqueue.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/i2c.h>
+#include <linux/rtc.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+/*
+ * AD774X registers definition
+ */
+
+#define AD774X_STATUS 0
+#define AD774X_STATUS_RDY (1 << 2)
+#define AD774X_STATUS_RDYVT (1 << 1)
+#define AD774X_STATUS_RDYCAP (1 << 0)
+#define AD774X_CAP_DATA_HIGH 1
+#define AD774X_CAP_DATA_MID 2
+#define AD774X_CAP_DATA_LOW 3
+#define AD774X_VT_DATA_HIGH 4
+#define AD774X_VT_DATA_MID 5
+#define AD774X_VT_DATA_LOW 6
+#define AD774X_CAP_SETUP 7
+#define AD774X_VT_SETUP 8
+#define AD774X_EXEC_SETUP 9
+#define AD774X_CFG 10
+#define AD774X_CAPDACA 11
+#define AD774X_CAPDACB 12
+#define AD774X_CAPDAC_EN (1 << 7)
+#define AD774X_CAP_OFFH 13
+#define AD774X_CAP_OFFL 14
+#define AD774X_CAP_GAINH 15
+#define AD774X_CAP_GAINL 16
+#define AD774X_VOLT_GAINH 17
+#define AD774X_VOLT_GAINL 18
+
+#define AD774X_MAX_CONV_MODE 6
+
+/*
+ * struct ad774x_chip_info - chip specifc information
+ */
+
+struct ad774x_chip_info {
+ const char *name;
+ struct i2c_client *client;
+ struct iio_dev *indio_dev;
+ struct work_struct thresh_work;
+ bool inter;
+ s64 last_timestamp;
+ u16 cap_offs; /* Capacitive offset */
+ u16 cap_gain; /* Capacitive gain calibration */
+ u16 volt_gain; /* Voltage gain calibration */
+ u8 cap_setup;
+ u8 vt_setup;
+ u8 exec_setup;
+
+ char *conversion_mode;
+};
+
+struct ad774x_conversion_mode {
+ char *name;
+ u8 reg_cfg;
+};
+
+struct ad774x_conversion_mode ad774x_conv_mode_table[AD774X_MAX_CONV_MODE] = {
+ { "idle", 0 },
+ { "continuous-conversion", 1 },
+ { "single-conversion", 2 },
+ { "power-down", 3 },
+ { "offset-calibration", 5 },
+ { "gain-calibration", 6 },
+};
+
+/*
+ * ad774x register access by I2C
+ */
+
+static int ad774x_i2c_read(struct ad774x_chip_info *chip, u8 reg, u8 *data, int len)
+{
+ struct i2c_client *client = chip->client;
+ int ret;
+
+ ret = i2c_master_send(client, ®, 1);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C write error\n");
+ return ret;
+ }
+
+ ret = i2c_master_recv(client, data, len);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C read error\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static int ad774x_i2c_write(struct ad774x_chip_info *chip, u8 reg, u8 data)
+{
+ struct i2c_client *client = chip->client;
+ int ret;
+
+ u8 tx[2] = {
+ reg,
+ data,
+ };
+
+ ret = i2c_master_send(client, tx, 2);
+ if (ret < 0)
+ dev_err(&client->dev, "I2C write error\n");
+
+ return ret;
+}
+
+/*
+ * sysfs nodes
+ */
+
+#define IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(_show) \
+ IIO_DEVICE_ATTR(available_conversion_modes, S_IRUGO, _show, NULL, 0)
+#define IIO_DEV_ATTR_CONVERSION_MODE(_mode, _show, _store) \
+ IIO_DEVICE_ATTR(conversion_mode, _mode, _show, _store, 0)
+#define IIO_DEV_ATTR_CAP_SETUP(_mode, _show, _store) \
+ IIO_DEVICE_ATTR(cap_setup, _mode, _show, _store, 0)
+#define IIO_DEV_ATTR_VT_SETUP(_mode, _show, _store) \
+ IIO_DEVICE_ATTR(in0_setup, _mode, _show, _store, 0)
+#define IIO_DEV_ATTR_EXEC_SETUP(_mode, _show, _store) \
+ IIO_DEVICE_ATTR(exec_setup, _mode, _show, _store, 0)
+#define IIO_DEV_ATTR_VOLT_GAIN(_mode, _show, _store) \
+ IIO_DEVICE_ATTR(in0_gain, _mode, _show, _store, 0)
+#define IIO_DEV_ATTR_CAP_OFFS(_mode, _show, _store) \
+ IIO_DEVICE_ATTR(cap_offs, _mode, _show, _store, 0)
+#define IIO_DEV_ATTR_CAP_GAIN(_mode, _show, _store) \
+ IIO_DEVICE_ATTR(cap_gain, _mode, _show, _store, 0)
+#define IIO_DEV_ATTR_CAP_DATA(_show) \
+ IIO_DEVICE_ATTR(cap0_raw, S_IRUGO, _show, NULL, 0)
+#define IIO_DEV_ATTR_VT_DATA(_show) \
+ IIO_DEVICE_ATTR(in0_raw, S_IRUGO, _show, NULL, 0)
+
+static ssize_t ad774x_show_conversion_modes(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int i;
+ int len = 0;
+
+ for (i = 0; i < AD774X_MAX_CONV_MODE; i++)
+ len += sprintf(buf + len, "%s ", ad774x_conv_mode_table[i].name);
+
+ len += sprintf(buf + len, "\n");
+
+ return len;
+}
+
+static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad774x_show_conversion_modes);
+
+static ssize_t ad774x_show_conversion_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+
+ return sprintf(buf, "%s\n", chip->conversion_mode);
+}
+
+static ssize_t ad774x_store_conversion_mode(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ u8 cfg;
+ int i;
+
+ ad774x_i2c_read(chip, AD774X_CFG, &cfg, 1);
+
+ for (i = 0; i < AD774X_MAX_CONV_MODE; i++) {
+ if (strncmp(buf, ad774x_conv_mode_table[i].name,
+ strlen(ad774x_conv_mode_table[i].name) - 1) == 0) {
+ chip->conversion_mode = ad774x_conv_mode_table[i].name;
+ cfg |= 0x18 | ad774x_conv_mode_table[i].reg_cfg;
+ ad774x_i2c_write(chip, AD774X_CFG, cfg);
+ return len;
+ }
+ }
+
+ dev_err(dev, "not supported conversion mode\n");
+
+ return -EINVAL;
+}
+
+static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO | S_IWUSR,
+ ad774x_show_conversion_mode,
+ ad774x_store_conversion_mode);
+
+static ssize_t ad774x_show_dac_value(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ u8 data;
+
+ ad774x_i2c_read(chip, this_attr->address, &data, 1);
+
+ return sprintf(buf, "%02x\n", data & 0x7F);
+}
+
+static ssize_t ad774x_store_dac_value(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ unsigned long data;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &data);
+
+ if (!ret) {
+ ad774x_i2c_write(chip, this_attr->address,
+ (data ? AD774X_CAPDAC_EN : 0) | (data & 0x7F));
+ return len;
+ }
+
+ return -EINVAL;
+}
+
+static IIO_DEVICE_ATTR(capdac0_raw, S_IRUGO | S_IWUSR,
+ ad774x_show_dac_value,
+ ad774x_store_dac_value,
+ AD774X_CAPDACA);
+
+static IIO_DEVICE_ATTR(capdac1_raw, S_IRUGO | S_IWUSR,
+ ad774x_show_dac_value,
+ ad774x_store_dac_value,
+ AD774X_CAPDACB);
+
+static ssize_t ad774x_show_cap_setup(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+
+ return sprintf(buf, "0x%02x\n", chip->cap_setup);
+}
+
+static ssize_t ad774x_store_cap_setup(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &data);
+
+ if ((!ret) && (data < 0x100)) {
+ ad774x_i2c_write(chip, AD774X_CAP_SETUP, data);
+ chip->cap_setup = data;
+ return len;
+ }
+
+ return -EINVAL;
+}
+
+static IIO_DEV_ATTR_CAP_SETUP(S_IRUGO | S_IWUSR,
+ ad774x_show_cap_setup,
+ ad774x_store_cap_setup);
+
+static ssize_t ad774x_show_vt_setup(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+
+ return sprintf(buf, "0x%02x\n", chip->vt_setup);
+}
+
+static ssize_t ad774x_store_vt_setup(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &data);
+
+ if ((!ret) && (data < 0x100)) {
+ ad774x_i2c_write(chip, AD774X_VT_SETUP, data);
+ chip->vt_setup = data;
+ return len;
+ }
+
+ return -EINVAL;
+}
+
+static IIO_DEV_ATTR_VT_SETUP(S_IRUGO | S_IWUSR,
+ ad774x_show_vt_setup,
+ ad774x_store_vt_setup);
+
+static ssize_t ad774x_show_exec_setup(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+
+ return sprintf(buf, "0x%02x\n", chip->exec_setup);
+}
+
+static ssize_t ad774x_store_exec_setup(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &data);
+
+ if ((!ret) && (data < 0x100)) {
+ ad774x_i2c_write(chip, AD774X_EXEC_SETUP, data);
+ chip->exec_setup = data;
+ return len;
+ }
+
+ return -EINVAL;
+}
+
+static IIO_DEV_ATTR_EXEC_SETUP(S_IRUGO | S_IWUSR,
+ ad774x_show_exec_setup,
+ ad774x_store_exec_setup);
+
+static ssize_t ad774x_show_volt_gain(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+
+ return sprintf(buf, "%d\n", chip->volt_gain);
+}
+
+static ssize_t ad774x_store_volt_gain(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &data);
+
+ if ((!ret) && (data < 0x10000)) {
+ ad774x_i2c_write(chip, AD774X_VOLT_GAINH, data >> 8);
+ ad774x_i2c_write(chip, AD774X_VOLT_GAINL, data);
+ chip->volt_gain = data;
+ return len;
+ }
+
+ return -EINVAL;
+}
+
+static IIO_DEV_ATTR_VOLT_GAIN(S_IRUGO | S_IWUSR,
+ ad774x_show_volt_gain,
+ ad774x_store_volt_gain);
+
+static ssize_t ad774x_show_cap_data(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ char tmp[3];
+
+ ad774x_i2c_read(chip, AD774X_CAP_DATA_HIGH, tmp, 3);
+ data = ((int)tmp[0] << 16) | ((int)tmp[1] << 8) | (int)tmp[2];
+
+ return sprintf(buf, "%ld\n", data);
+}
+
+static IIO_DEV_ATTR_CAP_DATA(ad774x_show_cap_data);
+
+static ssize_t ad774x_show_vt_data(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ char tmp[3];
+
+ ad774x_i2c_read(chip, AD774X_VT_DATA_HIGH, tmp, 3);
+ data = ((int)tmp[0] << 16) | ((int)tmp[1] << 8) | (int)tmp[2];
+
+ return sprintf(buf, "%ld\n", data);
+}
+
+static IIO_DEV_ATTR_VT_DATA(ad774x_show_vt_data);
+
+static ssize_t ad774x_show_cap_offs(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+
+ return sprintf(buf, "%d\n", chip->cap_offs);
+}
+
+static ssize_t ad774x_store_cap_offs(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &data);
+
+ if ((!ret) && (data < 0x10000)) {
+ ad774x_i2c_write(chip, AD774X_CAP_OFFH, data >> 8);
+ ad774x_i2c_write(chip, AD774X_CAP_OFFL, data);
+ chip->cap_offs = data;
+ return len;
+ }
+
+ return -EINVAL;
+}
+
+static IIO_DEV_ATTR_CAP_OFFS(S_IRUGO | S_IWUSR,
+ ad774x_show_cap_offs,
+ ad774x_store_cap_offs);
+
+static ssize_t ad774x_show_cap_gain(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+
+ return sprintf(buf, "%d\n", chip->cap_gain);
+}
+
+static ssize_t ad774x_store_cap_gain(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &data);
+
+ if ((!ret) && (data < 0x10000)) {
+ ad774x_i2c_write(chip, AD774X_CAP_GAINH, data >> 8);
+ ad774x_i2c_write(chip, AD774X_CAP_GAINL, data);
+ chip->cap_gain = data;
+ return len;
+ }
+
+ return -EINVAL;
+}
+
+static IIO_DEV_ATTR_CAP_GAIN(S_IRUGO | S_IWUSR,
+ ad774x_show_cap_gain,
+ ad774x_store_cap_gain);
+
+static ssize_t ad774x_show_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+ return sprintf(buf, "%s\n", chip->name);
+}
+
+static IIO_DEVICE_ATTR(name, S_IRUGO, ad774x_show_name, NULL, 0);
+
+static struct attribute *ad774x_attributes[] = {
+ &iio_dev_attr_available_conversion_modes.dev_attr.attr,
+ &iio_dev_attr_conversion_mode.dev_attr.attr,
+ &iio_dev_attr_cap_setup.dev_attr.attr,
+ &iio_dev_attr_in0_setup.dev_attr.attr,
+ &iio_dev_attr_exec_setup.dev_attr.attr,
+ &iio_dev_attr_cap_offs.dev_attr.attr,
+ &iio_dev_attr_cap_gain.dev_attr.attr,
+ &iio_dev_attr_in0_gain.dev_attr.attr,
+ &iio_dev_attr_in0_raw.dev_attr.attr,
+ &iio_dev_attr_cap0_raw.dev_attr.attr,
+ &iio_dev_attr_capdac0_raw.dev_attr.attr,
+ &iio_dev_attr_capdac1_raw.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad774x_attribute_group = {
+ .attrs = ad774x_attributes,
+};
+
+/*
+ * data ready events
+ */
+
+#define IIO_EVENT_CODE_CAP_RDY IIO_BUFFER_EVENT_CODE(0)
+#define IIO_EVENT_CODE_VT_RDY IIO_BUFFER_EVENT_CODE(1)
+
+#define IIO_EVENT_ATTR_CAP_RDY_SH(_evlist, _show, _store, _mask) \
+ IIO_EVENT_ATTR_SH(cap_rdy, _evlist, _show, _store, _mask)
+
+#define IIO_EVENT_ATTR_VT_RDY_SH(_evlist, _show, _store, _mask) \
+ IIO_EVENT_ATTR_SH(vt_rdy, _evlist, _show, _store, _mask)
+
+static void ad774x_interrupt_handler_bh(struct work_struct *work_s)
+{
+ struct ad774x_chip_info *chip =
+ container_of(work_s, struct ad774x_chip_info, thresh_work);
+ u8 int_status;
+
+ enable_irq(chip->client->irq);
+
+ ad774x_i2c_read(chip, AD774X_STATUS, &int_status, 1);
+
+ if (int_status & AD774X_STATUS_RDYCAP)
+ iio_push_event(chip->indio_dev, 0,
+ IIO_EVENT_CODE_CAP_RDY,
+ chip->last_timestamp);
+
+ if (int_status & AD774X_STATUS_RDYVT)
+ iio_push_event(chip->indio_dev, 0,
+ IIO_EVENT_CODE_VT_RDY,
+ chip->last_timestamp);
+}
+
+static int ad774x_interrupt_handler_th(struct iio_dev *dev_info,
+ int index,
+ s64 timestamp,
+ int no_test)
+{
+ struct ad774x_chip_info *chip = dev_info->dev_data;
+
+ chip->last_timestamp = timestamp;
+ schedule_work(&chip->thresh_work);
+
+ return 0;
+}
+
+IIO_EVENT_SH(data_rdy, &ad774x_interrupt_handler_th);
+
+static ssize_t ad774x_query_out_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ /*
+ * AD774X provides one /RDY pin, which can be used as interrupt
+ * but the pin is not configurable
+ */
+ return sprintf(buf, "1\n");
+}
+
+static ssize_t ad774x_set_out_mode(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return len;
+}
+
+IIO_EVENT_ATTR_CAP_RDY_SH(iio_event_data_rdy, ad774x_query_out_mode, ad774x_set_out_mode, 0);
+IIO_EVENT_ATTR_VT_RDY_SH(iio_event_data_rdy, ad774x_query_out_mode, ad774x_set_out_mode, 0);
+
+static struct attribute *ad774x_event_attributes[] = {
+ &iio_event_attr_cap_rdy.dev_attr.attr,
+ &iio_event_attr_vt_rdy.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad774x_event_attribute_group = {
+ .attrs = ad774x_event_attributes,
+};
+
+/*
+ * device probe and remove
+ */
+
+static int __devinit ad774x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret = 0, regdone = 0;
+ struct ad774x_chip_info *chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+ if (chip == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ /* this is only used for device removal purposes */
+ i2c_set_clientdata(client, chip);
+
+ chip->client = client;
+ chip->name = id->name;
+
+ chip->indio_dev = iio_allocate_device();
+ if (chip->indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_free_chip;
+ }
+
+ /* Establish that the iio_dev is a child of the i2c device */
+ chip->indio_dev->dev.parent = &client->dev;
+ chip->indio_dev->attrs = &ad774x_attribute_group;
+ chip->indio_dev->event_attrs = &ad774x_event_attribute_group;
+ chip->indio_dev->dev_data = (void *)(chip);
+ chip->indio_dev->driver_module = THIS_MODULE;
+ chip->indio_dev->num_interrupt_lines = 1;
+ chip->indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = iio_device_register(chip->indio_dev);
+ if (ret)
+ goto error_free_dev;
+ regdone = 1;
+
+ if (client->irq) {
+ ret = iio_register_interrupt_line(client->irq,
+ chip->indio_dev,
+ 0,
+ IRQF_TRIGGER_FALLING,
+ "ad774x");
+ if (ret)
+ goto error_free_dev;
+
+ iio_add_event_to_list(iio_event_attr_cap_rdy.listel,
+ &chip->indio_dev->interrupts[0]->ev_list);
+
+ INIT_WORK(&chip->thresh_work, ad774x_interrupt_handler_bh);
+ }
+
+ dev_err(&client->dev, "%s capacitive sensor registered, irq: %d\n", id->name, client->irq);
+
+ return 0;
+
+error_free_dev:
+ if (regdone)
+ iio_device_unregister(chip->indio_dev);
+ else
+ iio_free_device(chip->indio_dev);
+error_free_chip:
+ kfree(chip);
+error_ret:
+ return ret;
+}
+
+static int __devexit ad774x_remove(struct i2c_client *client)
+{
+ struct ad774x_chip_info *chip = i2c_get_clientdata(client);
+ struct iio_dev *indio_dev = chip->indio_dev;
+
+ if (client->irq)
+ iio_unregister_interrupt_line(indio_dev, 0);
+ iio_device_unregister(indio_dev);
+ kfree(chip);
+
+ return 0;
+}
+
+static const struct i2c_device_id ad774x_id[] = {
+ { "ad7745", 0 },
+ { "ad7746", 0 },
+ { "ad7747", 0 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ad774x_id);
+
+static struct i2c_driver ad774x_driver = {
+ .driver = {
+ .name = "ad774x",
+ },
+ .probe = ad774x_probe,
+ .remove = __devexit_p(ad774x_remove),
+ .id_table = ad774x_id,
+};
+
+static __init int ad774x_init(void)
+{
+ return i2c_add_driver(&ad774x_driver);
+}
+
+static __exit void ad774x_exit(void)
+{
+ i2c_del_driver(&ad774x_driver);
+}
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices ad7745/6/7 capacitive sensor driver");
+MODULE_LICENSE("GPL v2");
+
+module_init(ad774x_init);
+module_exit(ad774x_exit);
git.openpandora.org / pandora-kernel.git / commitdiff