/*
* AD7150 capacitive sensor driver supporting AD7150/1/6
*
* 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"
/*
* AD7150 registers definition
*/
#define AD7150_STATUS 0
#define AD7150_STATUS_OUT1 (1 << 3)
#define AD7150_STATUS_OUT2 (1 << 5)
#define AD7150_CH1_DATA_HIGH 1
#define AD7150_CH1_DATA_LOW 2
#define AD7150_CH2_DATA_HIGH 3
#define AD7150_CH2_DATA_LOW 4
#define AD7150_CH1_AVG_HIGH 5
#define AD7150_CH1_AVG_LOW 6
#define AD7150_CH2_AVG_HIGH 7
#define AD7150_CH2_AVG_LOW 8
#define AD7150_CH1_SENSITIVITY 9
#define AD7150_CH1_THR_HOLD_H 9
#define AD7150_CH1_TIMEOUT 10
#define AD7150_CH1_THR_HOLD_L 10
#define AD7150_CH1_SETUP 11
#define AD7150_CH2_SENSITIVITY 12
#define AD7150_CH2_THR_HOLD_H 12
#define AD7150_CH2_TIMEOUT 13
#define AD7150_CH2_THR_HOLD_L 13
#define AD7150_CH2_SETUP 14
#define AD7150_CFG 15
#define AD7150_CFG_FIX (1 << 7)
#define AD7150_PD_TIMER 16
#define AD7150_CH1_CAPDAC 17
#define AD7150_CH2_CAPDAC 18
#define AD7150_SN3 19
#define AD7150_SN2 20
#define AD7150_SN1 21
#define AD7150_SN0 22
#define AD7150_ID 23
#define AD7150_MAX_CONV_MODE 4
/*
* struct ad7150_chip_info - chip specifc information
*/
struct ad7150_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 ch1_threshold; /* Ch1 Threshold (in fixed threshold mode) */
u8 ch1_sensitivity; /* Ch1 Sensitivity (in adaptive threshold mode) */
u8 ch1_timeout; /* Ch1 Timeout (in adaptive threshold mode) */
u8 ch1_setup;
u16 ch2_threshold; /* Ch2 Threshold (in fixed threshold mode) */
u8 ch2_sensitivity; /* Ch1 Sensitivity (in adaptive threshold mode) */
u8 ch2_timeout; /* Ch1 Timeout (in adaptive threshold mode) */
u8 ch2_setup;
u8 powerdown_timer;
char threshold_mode[10]; /* adaptive/fixed threshold mode */
int old_state;
char *conversion_mode;
};
struct ad7150_conversion_mode {
char *name;
u8 reg_cfg;
};
struct ad7150_conversion_mode ad7150_conv_mode_table[AD7150_MAX_CONV_MODE] = {
{ "idle", 0 },
{ "continuous-conversion", 1 },
{ "single-conversion", 2 },
{ "power-down", 3 },
};
/*
* ad7150 register access by I2C
*/
static int ad7150_i2c_read(struct ad7150_chip_info *chip, u8 reg, u8 *data, int len)
{
struct i2c_client *client = chip->client;
int ret = 0;
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 ad7150_i2c_write(struct ad7150_chip_info *chip, u8 reg, u8 data)
{
struct i2c_client *client = chip->client;
int ret = 0;
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_AVAIL_THRESHOLD_MODES(_show) \
IIO_DEVICE_ATTR(available_threshold_modes, S_IRUGO, _show, NULL, 0)
#define IIO_DEV_ATTR_THRESHOLD_MODE(_mode, _show, _store) \
IIO_DEVICE_ATTR(threshold_mode, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH1_THRESHOLD(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch1_threshold, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH2_THRESHOLD(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch2_threshold, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH1_SENSITIVITY(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch1_sensitivity, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH2_SENSITIVITY(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch2_sensitivity, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH1_TIMEOUT(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch1_timeout, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH2_TIMEOUT(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch2_timeout, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH1_VALUE(_show) \
IIO_DEVICE_ATTR(ch1_value, S_IRUGO, _show, NULL, 0)
#define IIO_DEV_ATTR_CH2_VALUE(_show) \
IIO_DEVICE_ATTR(ch2_value, S_IRUGO, _show, NULL, 0)
#define IIO_DEV_ATTR_CH1_SETUP(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch1_setup, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH2_SETUP(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch2_setup, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_POWERDOWN_TIMER(_mode, _show, _store) \
IIO_DEVICE_ATTR(powerdown_timer, _mode, _show, _store, 0)
static ssize_t ad7150_show_conversion_modes(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int i;
int len = 0;
for (i = 0; i < AD7150_MAX_CONV_MODE; i++)
len += sprintf(buf + len, "%s\n", ad7150_conv_mode_table[i].name);
return len;
}
static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad7150_show_conversion_modes);
static ssize_t ad7150_show_conversion_mode(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%s\n", chip->conversion_mode);
}
static ssize_t ad7150_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 ad7150_chip_info *chip = dev_info->dev_data;
u8 cfg;
int i;
ad7150_i2c_read(chip, AD7150_CFG, &cfg, 1);
for (i = 0; i < AD7150_MAX_CONV_MODE; i++) {
if (strncmp(buf, ad7150_conv_mode_table[i].name,
strlen(ad7150_conv_mode_table[i].name) - 1) == 0) {
chip->conversion_mode = ad7150_conv_mode_table[i].name;
cfg |= 0x18 | ad7150_conv_mode_table[i].reg_cfg;
ad7150_i2c_write(chip, AD7150_CFG, cfg);
return len;
}
}
dev_err(dev, "not supported conversion mode\n");
return -EINVAL;
}
static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO | S_IWUSR,
ad7150_show_conversion_mode,
ad7150_store_conversion_mode);
static ssize_t ad7150_show_threshold_modes(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "adaptive\nfixed\n");
}
static IIO_DEV_ATTR_AVAIL_THRESHOLD_MODES(ad7150_show_threshold_modes);
static ssize_t ad7150_show_ch1_value(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
u8 data[2];
ad7150_i2c_read(chip, AD7150_CH1_DATA_HIGH, data, 2);
return sprintf(buf, "%d\n", ((int) data[0] << 8) | data[1]);
}
static IIO_DEV_ATTR_CH1_VALUE(ad7150_show_ch1_value);
static ssize_t ad7150_show_ch2_value(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
u8 data[2];
ad7150_i2c_read(chip, AD7150_CH2_DATA_HIGH, data, 2);
return sprintf(buf, "%d\n", ((int) data[0] << 8) | data[1]);
}
static IIO_DEV_ATTR_CH2_VALUE(ad7150_show_ch2_value);
static ssize_t ad7150_show_threshold_mode(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%s\n", chip->threshold_mode);
}
static ssize_t ad7150_store_threshold_mode(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
u8 cfg;
ad7150_i2c_read(chip, AD7150_CFG, &cfg, 1);
if (strncmp(buf, "fixed", 5) == 0) {
strcpy(chip->threshold_mode, "fixed");
cfg |= AD7150_CFG_FIX;
ad7150_i2c_write(chip, AD7150_CFG, cfg);
return len;
} else if (strncmp(buf, "adaptive", 8) == 0) {
strcpy(chip->threshold_mode, "adaptive");
cfg &= ~AD7150_CFG_FIX;
ad7150_i2c_write(chip, AD7150_CFG, cfg);
return len;
}
dev_err(dev, "not supported threshold mode\n");
return -EINVAL;
}
static IIO_DEV_ATTR_THRESHOLD_MODE(S_IRUGO | S_IWUSR,
ad7150_show_threshold_mode,
ad7150_store_threshold_mode);
static ssize_t ad7150_show_ch1_threshold(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%d\n", chip->ch1_threshold);
}
static ssize_t ad7150_store_ch1_threshold(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x10000)) {
ad7150_i2c_write(chip, AD7150_CH1_THR_HOLD_H, data >> 8);
ad7150_i2c_write(chip, AD7150_CH1_THR_HOLD_L, data);
chip->ch1_threshold = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH1_THRESHOLD(S_IRUGO | S_IWUSR,
ad7150_show_ch1_threshold,
ad7150_store_ch1_threshold);
static ssize_t ad7150_show_ch2_threshold(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%d\n", chip->ch2_threshold);
}
static ssize_t ad7150_store_ch2_threshold(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x10000)) {
ad7150_i2c_write(chip, AD7150_CH2_THR_HOLD_H, data >> 8);
ad7150_i2c_write(chip, AD7150_CH2_THR_HOLD_L, data);
chip->ch2_threshold = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH2_THRESHOLD(S_IRUGO | S_IWUSR,
ad7150_show_ch2_threshold,
ad7150_store_ch2_threshold);
static ssize_t ad7150_show_ch1_sensitivity(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%d\n", chip->ch1_sensitivity);
}
static ssize_t ad7150_store_ch1_sensitivity(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x100)) {
ad7150_i2c_write(chip, AD7150_CH1_SENSITIVITY, data);
chip->ch1_sensitivity = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH1_SENSITIVITY(S_IRUGO | S_IWUSR,
ad7150_show_ch1_sensitivity,
ad7150_store_ch1_sensitivity);
static ssize_t ad7150_show_ch2_sensitivity(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%d\n", chip->ch2_sensitivity);
}
static ssize_t ad7150_store_ch2_sensitivity(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x100)) {
ad7150_i2c_write(chip, AD7150_CH2_SENSITIVITY, data);
chip->ch2_sensitivity = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH2_SENSITIVITY(S_IRUGO | S_IWUSR,
ad7150_show_ch2_sensitivity,
ad7150_store_ch2_sensitivity);
static ssize_t ad7150_show_ch1_timeout(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%d\n", chip->ch1_timeout);
}
static ssize_t ad7150_store_ch1_timeout(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x100)) {
ad7150_i2c_write(chip, AD7150_CH1_TIMEOUT, data);
chip->ch1_timeout = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH1_TIMEOUT(S_IRUGO | S_IWUSR,
ad7150_show_ch1_timeout,
ad7150_store_ch1_timeout);
static ssize_t ad7150_show_ch2_timeout(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%d\n", chip->ch2_timeout);
}
static ssize_t ad7150_store_ch2_timeout(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x100)) {
ad7150_i2c_write(chip, AD7150_CH2_TIMEOUT, data);
chip->ch2_timeout = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH2_TIMEOUT(S_IRUGO | S_IWUSR,
ad7150_show_ch2_timeout,
ad7150_store_ch2_timeout);
static ssize_t ad7150_show_ch1_setup(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "0x%02x\n", chip->ch1_setup);
}
static ssize_t ad7150_store_ch1_setup(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x100)) {
ad7150_i2c_write(chip, AD7150_CH1_SETUP, data);
chip->ch1_setup = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH1_SETUP(S_IRUGO | S_IWUSR,
ad7150_show_ch1_setup,
ad7150_store_ch1_setup);
static ssize_t ad7150_show_ch2_setup(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "0x%02x\n", chip->ch2_setup);
}
static ssize_t ad7150_store_ch2_setup(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x100)) {
ad7150_i2c_write(chip, AD7150_CH2_SETUP, data);
chip->ch2_setup = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH2_SETUP(S_IRUGO | S_IWUSR,
ad7150_show_ch2_setup,
ad7150_store_ch2_setup);
static ssize_t ad7150_show_name(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%s\n", chip->name);
}
static IIO_DEVICE_ATTR(name, S_IRUGO, ad7150_show_name, NULL, 0);
static ssize_t ad7150_show_powerdown_timer(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "0x%02x\n", chip->powerdown_timer);
}
static ssize_t ad7150_store_powerdown_timer(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7150_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x40)) {
chip->powerdown_timer = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_POWERDOWN_TIMER(S_IRUGO | S_IWUSR,
ad7150_show_powerdown_timer,
ad7150_store_powerdown_timer);
static struct attribute *ad7150_attributes[] = {
&iio_dev_attr_available_threshold_modes.dev_attr.attr,
&iio_dev_attr_threshold_mode.dev_attr.attr,
&iio_dev_attr_ch1_threshold.dev_attr.attr,
&iio_dev_attr_ch2_threshold.dev_attr.attr,
&iio_dev_attr_ch1_timeout.dev_attr.attr,
&iio_dev_attr_ch2_timeout.dev_attr.attr,
&iio_dev_attr_ch1_setup.dev_attr.attr,
&iio_dev_attr_ch2_setup.dev_attr.attr,
&iio_dev_attr_ch1_sensitivity.dev_attr.attr,
&iio_dev_attr_ch2_sensitivity.dev_attr.attr,
&iio_dev_attr_powerdown_timer.dev_attr.attr,
&iio_dev_attr_ch1_value.dev_attr.attr,
&iio_dev_attr_ch2_value.dev_attr.attr,
&iio_dev_attr_name.dev_attr.attr,
NULL,
};
static const struct attribute_group ad7150_attribute_group = {
.attrs = ad7150_attributes,
};
/*
* threshold events
*/
#define IIO_EVENT_CODE_CH1_HIGH IIO_BUFFER_EVENT_CODE(0)
#define IIO_EVENT_CODE_CH1_LOW IIO_BUFFER_EVENT_CODE(1)
#define IIO_EVENT_CODE_CH2_HIGH IIO_BUFFER_EVENT_CODE(2)
#define IIO_EVENT_CODE_CH2_LOW IIO_BUFFER_EVENT_CODE(3)
#define IIO_EVENT_ATTR_CH1_HIGH_SH(_evlist, _show, _store, _mask) \
IIO_EVENT_ATTR_SH(ch1_high, _evlist, _show, _store, _mask)
#define IIO_EVENT_ATTR_CH2_HIGH_SH(_evlist, _show, _store, _mask) \
IIO_EVENT_ATTR_SH(ch2_high, _evlist, _show, _store, _mask)
#define IIO_EVENT_ATTR_CH1_LOW_SH(_evlist, _show, _store, _mask) \
IIO_EVENT_ATTR_SH(ch1_low, _evlist, _show, _store, _mask)
#define IIO_EVENT_ATTR_CH2_LOW_SH(_evlist, _show, _store, _mask) \
IIO_EVENT_ATTR_SH(ch2_low, _evlist, _show, _store, _mask)
static void ad7150_interrupt_handler_bh(struct work_struct *work_s)
{
struct ad7150_chip_info *chip =
container_of(work_s, struct ad7150_chip_info, thresh_work);
u8 int_status;
enable_irq(chip->client->irq);
ad7150_i2c_read(chip, AD7150_STATUS, &int_status, 1);
if ((int_status & AD7150_STATUS_OUT1) && !(chip->old_state & AD7150_STATUS_OUT1))
iio_push_event(chip->indio_dev, 0,
IIO_EVENT_CODE_CH1_HIGH,
chip->last_timestamp);
else if ((!(int_status & AD7150_STATUS_OUT1)) && (chip->old_state & AD7150_STATUS_OUT1))
iio_push_event(chip->indio_dev, 0,
IIO_EVENT_CODE_CH1_LOW,
chip->last_timestamp);
if ((int_status & AD7150_STATUS_OUT2) && !(chip->old_state & AD7150_STATUS_OUT2))
iio_push_event(chip->indio_dev, 0,
IIO_EVENT_CODE_CH2_HIGH,
chip->last_timestamp);
else if ((!(int_status & AD7150_STATUS_OUT2)) && (chip->old_state & AD7150_STATUS_OUT2))
iio_push_event(chip->indio_dev, 0,
IIO_EVENT_CODE_CH2_LOW,
chip->last_timestamp);
}
static int ad7150_interrupt_handler_th(struct iio_dev *dev_info,
int index,
s64 timestamp,
int no_test)
{
struct ad7150_chip_info *chip = dev_info->dev_data;
chip->last_timestamp = timestamp;
schedule_work(&chip->thresh_work);
return 0;
}
IIO_EVENT_SH(threshold, &ad7150_interrupt_handler_th);
static ssize_t ad7150_query_out_mode(struct device *dev,
struct device_attribute *attr,
char *buf)
{
/*
* AD7150 provides two logic output channels, which can be used as interrupt
* but the pins are not configurable
*/
return sprintf(buf, "1\n");
}
static ssize_t ad7150_set_out_mode(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
return len;
}
IIO_EVENT_ATTR_CH1_HIGH_SH(iio_event_threshold, ad7150_query_out_mode, ad7150_set_out_mode, 0);
IIO_EVENT_ATTR_CH2_HIGH_SH(iio_event_threshold, ad7150_query_out_mode, ad7150_set_out_mode, 0);
IIO_EVENT_ATTR_CH1_LOW_SH(iio_event_threshold, ad7150_query_out_mode, ad7150_set_out_mode, 0);
IIO_EVENT_ATTR_CH2_LOW_SH(iio_event_threshold, ad7150_query_out_mode, ad7150_set_out_mode, 0);
static struct attribute *ad7150_event_attributes[] = {
&iio_event_attr_ch1_high.dev_attr.attr,
&iio_event_attr_ch2_high.dev_attr.attr,
&iio_event_attr_ch1_low.dev_attr.attr,
&iio_event_attr_ch2_low.dev_attr.attr,
NULL,
};
static struct attribute_group ad7150_event_attribute_group = {
.attrs = ad7150_event_attributes,
};
/*
* device probe and remove
*/
static int __devinit ad7150_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret = 0, regdone = 0;
struct ad7150_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;
}
/* Echipabilish that the iio_dev is a child of the i2c device */
chip->indio_dev->dev.parent = &client->dev;
chip->indio_dev->attrs = &ad7150_attribute_group;
chip->indio_dev->event_attrs = &ad7150_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 && gpio_is_valid(irq_to_gpio(client->irq)) > 0) {
ret = iio_register_interrupt_line(client->irq,
chip->indio_dev,
0,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"ad7150");
if (ret)
goto error_free_dev;
iio_add_event_to_list(iio_event_attr_ch2_low.listel,
&chip->indio_dev->interrupts[0]->ev_list);
INIT_WORK(&chip->thresh_work, ad7150_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 ad7150_remove(struct i2c_client *client)
{
struct ad7150_chip_info *chip = i2c_get_clientdata(client);
struct iio_dev *indio_dev = chip->indio_dev;
if (client->irq && gpio_is_valid(irq_to_gpio(client->irq)) > 0)
iio_unregister_interrupt_line(indio_dev, 0);
iio_device_unregister(indio_dev);
kfree(chip);
return 0;
}
static const struct i2c_device_id ad7150_id[] = {
{ "ad7150", 0 },
{ "ad7151", 0 },
{ "ad7156", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, ad7150_id);
static struct i2c_driver ad7150_driver = {
.driver = {
.name = "ad7150",
},
.probe = ad7150_probe,
.remove = __devexit_p(ad7150_remove),
.id_table = ad7150_id,
};
static __init int ad7150_init(void)
{
return i2c_add_driver(&ad7150_driver);
}
static __exit void ad7150_exit(void)
{
i2c_del_driver(&ad7150_driver);
}
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices ad7150/1/6 capacitive sensor driver");
MODULE_LICENSE("GPL v2");
module_init(ad7150_init);
module_exit(ad7150_exit);