diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/staging/iio/adc/ad7150.c | 877 |
1 files changed, 877 insertions, 0 deletions
diff --git a/drivers/staging/iio/adc/ad7150.c b/drivers/staging/iio/adc/ad7150.c new file mode 100644 index 000000000000..8555766109d8 --- /dev/null +++ b/drivers/staging/iio/adc/ad7150.c @@ -0,0 +1,877 @@ +/* + * 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); |