diff options
Diffstat (limited to 'drivers/staging/iio/adc/ad7291.c')
| -rw-r--r-- | drivers/staging/iio/adc/ad7291.c | 1039 |
1 files changed, 1039 insertions, 0 deletions
diff --git a/drivers/staging/iio/adc/ad7291.c b/drivers/staging/iio/adc/ad7291.c new file mode 100644 index 000000000000..34041a72aa52 --- /dev/null +++ b/drivers/staging/iio/adc/ad7291.c @@ -0,0 +1,1039 @@ +/* + * AD7291 digital temperature sensor driver supporting AD7291 + * + * 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" + +/* + * AD7291 registers definition + */ +#define AD7291_COMMAND 0 +#define AD7291_VOLTAGE 1 +#define AD7291_T_SENSE 2 +#define AD7291_T_AVERAGE 3 +#define AD7291_VOLTAGE_LIMIT_BASE 4 +#define AD7291_VOLTAGE_LIMIT_COUNT 8 +#define AD7291_T_SENSE_HIGH 0x1c +#define AD7291_T_SENSE_LOW 0x1d +#define AD7291_T_SENSE_HYST 0x1e +#define AD7291_VOLTAGE_ALERT_STATUS 0x1f +#define AD7291_T_ALERT_STATUS 0x20 + +/* + * AD7291 command + */ +#define AD7291_AUTOCYCLE 0x1 +#define AD7291_RESET 0x2 +#define AD7291_ALART_CLEAR 0x4 +#define AD7291_ALART_POLARITY 0x8 +#define AD7291_EXT_REF 0x10 +#define AD7291_NOISE_DELAY 0x20 +#define AD7291_T_SENSE_MASK 0x40 +#define AD7291_VOLTAGE_MASK 0xff00 +#define AD7291_VOLTAGE_OFFSET 0x8 + +/* + * AD7291 value masks + */ +#define AD7291_CHANNEL_MASK 0xf000 +#define AD7291_VALUE_MASK 0xfff +#define AD7291_T_VALUE_SIGN 0x400 +#define AD7291_T_VALUE_FLOAT_OFFSET 2 +#define AD7291_T_VALUE_FLOAT_MASK 0x2 + +/* + * struct ad7291_chip_info - chip specifc information + */ + +struct ad7291_chip_info { + const char *name; + struct i2c_client *client; + struct iio_dev *indio_dev; + struct work_struct thresh_work; + s64 last_timestamp; + u16 command; + u8 channels; /* Active voltage channels */ +}; + +/* + * struct ad7291_chip_info - chip specifc information + */ + +struct ad7291_limit_regs { + u16 data_high; + u16 data_low; + u16 hysteresis; +}; + +/* + * ad7291 register access by I2C + */ +static int ad7291_i2c_read(struct ad7291_chip_info *chip, u8 reg, u16 *data) +{ + struct i2c_client *client = chip->client; + int ret = 0; + + ret = i2c_smbus_read_word_data(client, reg); + if (ret < 0) { + dev_err(&client->dev, "I2C read error\n"); + return ret; + } + + *data = swab16((u16)ret); + + return 0; +} + +static int ad7291_i2c_write(struct ad7291_chip_info *chip, u8 reg, u16 data) +{ + struct i2c_client *client = chip->client; + int ret = 0; + + ret = i2c_smbus_write_word_data(client, reg, swab16(data)); + if (ret < 0) + dev_err(&client->dev, "I2C write error\n"); + + return ret; +} + +/* Returns negative errno, or else the number of words read. */ +static int ad7291_i2c_read_data(struct ad7291_chip_info *chip, u8 reg, u16 *data) +{ + struct i2c_client *client = chip->client; + u8 commands[4]; + int ret = 0; + int i, count; + + if (reg == AD7291_T_SENSE || reg == AD7291_T_AVERAGE) + count = 2; + else if (reg == AD7291_VOLTAGE) { + if (!chip->channels) { + dev_err(&client->dev, "No voltage channel is selected.\n"); + return -EINVAL; + } + count = 2 + chip->channels * 2; + } else { + dev_err(&client->dev, "I2C wrong data register\n"); + return -EINVAL; + } + + commands[0] = 0; + commands[1] = (chip->command >> 8) & 0xff; + commands[2] = chip->command & 0xff; + commands[3] = reg; + + ret = i2c_master_send(client, commands, 4); + if (ret < 0) { + dev_err(&client->dev, "I2C master send error\n"); + return ret; + } + + ret = i2c_master_recv(client, (u8 *)data, count); + if (ret < 0) { + dev_err(&client->dev, "I2C master receive error\n"); + return ret; + } + ret >>= 2; + + for (i = 0; i < ret; i++) + data[i] = swab16(data[i]); + + return ret; +} + +static ssize_t ad7291_show_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + + if (chip->command & AD7291_AUTOCYCLE) + return sprintf(buf, "autocycle\n"); + else + return sprintf(buf, "command\n"); +} + +static ssize_t ad7291_store_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + u16 command; + int ret; + + command = chip->command & (~AD7291_AUTOCYCLE); + if (strcmp(buf, "autocycle")) + command |= AD7291_AUTOCYCLE; + + ret = ad7291_i2c_write(chip, AD7291_COMMAND, command); + if (ret) + return -EIO; + + chip->command = command; + + return ret; +} + +static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, + ad7291_show_mode, + ad7291_store_mode, + 0); + +static ssize_t ad7291_show_available_modes(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "command\nautocycle\n"); +} + +static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7291_show_available_modes, NULL, 0); + +static ssize_t ad7291_store_reset(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + u16 command; + int ret; + + command = chip->command | AD7291_RESET; + + ret = ad7291_i2c_write(chip, AD7291_COMMAND, command); + if (ret) + return -EIO; + + return ret; +} + +static IIO_DEVICE_ATTR(reset, S_IWUSR, + NULL, + ad7291_store_reset, + 0); + +static ssize_t ad7291_show_ext_ref(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + + return sprintf(buf, "%d\n", !!(chip->command & AD7291_EXT_REF)); +} + +static ssize_t ad7291_store_ext_ref(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + u16 command; + int ret; + + command = chip->command & (~AD7291_EXT_REF); + if (strcmp(buf, "1")) + command |= AD7291_EXT_REF; + + ret = ad7291_i2c_write(chip, AD7291_COMMAND, command); + if (ret) + return -EIO; + + chip->command = command; + + return ret; +} + +static IIO_DEVICE_ATTR(ext_ref, S_IRUGO | S_IWUSR, + ad7291_show_ext_ref, + ad7291_store_ext_ref, + 0); + +static ssize_t ad7291_show_noise_delay(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + + return sprintf(buf, "%d\n", !!(chip->command & AD7291_NOISE_DELAY)); +} + +static ssize_t ad7291_store_noise_delay(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + u16 command; + int ret; + + command = chip->command & (~AD7291_NOISE_DELAY); + if (strcmp(buf, "1")) + command |= AD7291_NOISE_DELAY; + + ret = ad7291_i2c_write(chip, AD7291_COMMAND, command); + if (ret) + return -EIO; + + chip->command = command; + + return ret; +} + +static IIO_DEVICE_ATTR(noise_delay, S_IRUGO | S_IWUSR, + ad7291_show_noise_delay, + ad7291_store_noise_delay, + 0); + +static ssize_t ad7291_show_t_sense(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + u16 data; + char sign = ' '; + int ret; + + ret = ad7291_i2c_read_data(chip, AD7291_T_SENSE, &data); + if (ret) + return -EIO; + + if (data & AD7291_T_VALUE_SIGN) { + /* convert supplement to positive value */ + data = (AD7291_T_VALUE_SIGN << 1) - data; + sign = '-'; + } + + return sprintf(buf, "%c%d.%.2d\n", sign, + (data >> AD7291_T_VALUE_FLOAT_OFFSET), + (data & AD7291_T_VALUE_FLOAT_MASK) * 25); +} + +static IIO_DEVICE_ATTR(t_sense, S_IRUGO, ad7291_show_t_sense, NULL, 0); + +static ssize_t ad7291_show_t_average(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + u16 data; + char sign = ' '; + int ret; + + ret = ad7291_i2c_read_data(chip, AD7291_T_AVERAGE, &data); + if (ret) + return -EIO; + + if (data & AD7291_T_VALUE_SIGN) { + /* convert supplement to positive value */ + data = (AD7291_T_VALUE_SIGN << 1) - data; + sign = '-'; + } + + return sprintf(buf, "%c%d.%.2d\n", sign, + (data >> AD7291_T_VALUE_FLOAT_OFFSET), + (data & AD7291_T_VALUE_FLOAT_MASK) * 25); +} + +static IIO_DEVICE_ATTR(t_average, S_IRUGO, ad7291_show_t_average, NULL, 0); + +static ssize_t ad7291_show_voltage(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + u16 data[AD7291_VOLTAGE_LIMIT_COUNT]; + int i, size, ret; + + ret = ad7291_i2c_read_data(chip, AD7291_VOLTAGE, data); + if (ret) + return -EIO; + + for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT; i++) { + if (chip->command & (AD7291_T_SENSE_MASK << i)) { + ret = sprintf(buf, "channel[%d]=%d\n", i, + data[i] & AD7291_VALUE_MASK); + if (ret < 0) + break; + buf += ret; + size += ret; + } + } + + return size; +} + +static IIO_DEVICE_ATTR(voltage, S_IRUGO, ad7291_show_voltage, NULL, 0); + +static ssize_t ad7291_show_channel_mask(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + + return sprintf(buf, "0x%x\n", (chip->command & AD7291_VOLTAGE_MASK) >> + AD7291_VOLTAGE_OFFSET); +} + +static ssize_t ad7291_store_channel_mask(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + u16 command; + unsigned long data; + int i, ret; + + ret = strict_strtoul(buf, 16, &data); + if (ret || data > 0xff) + return -EINVAL; + + command = chip->command & (~AD7291_VOLTAGE_MASK); + command |= data << AD7291_VOLTAGE_OFFSET; + + ret = ad7291_i2c_write(chip, AD7291_COMMAND, command); + if (ret) + return -EIO; + + chip->command = command; + + for (i = 0, chip->channels = 0; i < AD7291_VOLTAGE_LIMIT_COUNT; i++) { + if (chip->command & (AD7291_T_SENSE_MASK << i)) + chip->channels++; + } + + return ret; +} + +static IIO_DEVICE_ATTR(channel_mask, S_IRUGO | S_IWUSR, + ad7291_show_channel_mask, + ad7291_store_channel_mask, + 0); + +static ssize_t ad7291_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + return sprintf(buf, "%s\n", chip->name); +} + +static IIO_DEVICE_ATTR(name, S_IRUGO, ad7291_show_name, NULL, 0); + +static struct attribute *ad7291_attributes[] = { + &iio_dev_attr_available_modes.dev_attr.attr, + &iio_dev_attr_mode.dev_attr.attr, + &iio_dev_attr_reset.dev_attr.attr, + &iio_dev_attr_ext_ref.dev_attr.attr, + &iio_dev_attr_noise_delay.dev_attr.attr, + &iio_dev_attr_t_sense.dev_attr.attr, + &iio_dev_attr_t_average.dev_attr.attr, + &iio_dev_attr_voltage.dev_attr.attr, + &iio_dev_attr_channel_mask.dev_attr.attr, + &iio_dev_attr_name.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad7291_attribute_group = { + .attrs = ad7291_attributes, +}; + +/* + * temperature bound events + */ + +#define IIO_EVENT_CODE_AD7291_T_SENSE_HIGH IIO_BUFFER_EVENT_CODE(0) +#define IIO_EVENT_CODE_AD7291_T_SENSE_LOW IIO_BUFFER_EVENT_CODE(1) +#define IIO_EVENT_CODE_AD7291_T_AVG_HIGH IIO_BUFFER_EVENT_CODE(2) +#define IIO_EVENT_CODE_AD7291_T_AVG_LOW IIO_BUFFER_EVENT_CODE(3) +#define IIO_EVENT_CODE_AD7291_VOLTAGE_BASE IIO_BUFFER_EVENT_CODE(4) + +static void ad7291_interrupt_bh(struct work_struct *work_s) +{ + struct ad7291_chip_info *chip = + container_of(work_s, struct ad7291_chip_info, thresh_work); + u16 t_status, v_status; + u16 command; + int i; + + if (ad7291_i2c_read(chip, AD7291_T_ALERT_STATUS, &t_status)) + return; + + if (ad7291_i2c_read(chip, AD7291_VOLTAGE_ALERT_STATUS, &v_status)) + return; + + if (!(t_status || v_status)) + return; + + command = chip->command | AD7291_ALART_CLEAR; + ad7291_i2c_write(chip, AD7291_COMMAND, command); + + command = chip->command & ~AD7291_ALART_CLEAR; + ad7291_i2c_write(chip, AD7291_COMMAND, command); + + enable_irq(chip->client->irq); + + for (i = 0; i < 4; i++) { + if (t_status & (1 << i)) + iio_push_event(chip->indio_dev, 0, + IIO_EVENT_CODE_AD7291_T_SENSE_HIGH + i, + chip->last_timestamp); + } + + for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT*2; i++) { + if (v_status & (1 << i)) + iio_push_event(chip->indio_dev, 0, + IIO_EVENT_CODE_AD7291_VOLTAGE_BASE + i, + chip->last_timestamp); + } +} + +static int ad7291_interrupt(struct iio_dev *dev_info, + int index, + s64 timestamp, + int no_test) +{ + struct ad7291_chip_info *chip = dev_info->dev_data; + + chip->last_timestamp = timestamp; + schedule_work(&chip->thresh_work); + + return 0; +} + +IIO_EVENT_SH(ad7291, &ad7291_interrupt); + +static inline ssize_t ad7291_show_t_bound(struct device *dev, + struct device_attribute *attr, + u8 bound_reg, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + u16 data; + char sign = ' '; + int ret; + + ret = ad7291_i2c_read(chip, bound_reg, &data); + if (ret) + return -EIO; + + data &= AD7291_VALUE_MASK; + if (data & AD7291_T_VALUE_SIGN) { + /* convert supplement to positive value */ + data = (AD7291_T_VALUE_SIGN << 1) - data; + sign = '-'; + } + + return sprintf(buf, "%c%d.%.2d\n", sign, + data >> AD7291_T_VALUE_FLOAT_OFFSET, + (data & AD7291_T_VALUE_FLOAT_MASK) * 25); +} + +static inline ssize_t ad7291_set_t_bound(struct device *dev, + struct device_attribute *attr, + u8 bound_reg, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + long tmp1, tmp2; + u16 data; + char *pos; + int ret; + + pos = strchr(buf, '.'); + + ret = strict_strtol(buf, 10, &tmp1); + + if (ret || tmp1 > 127 || tmp1 < -128) + return -EINVAL; + + if (pos) { + len = strlen(pos); + if (len > AD7291_T_VALUE_FLOAT_OFFSET) + len = AD7291_T_VALUE_FLOAT_OFFSET; + pos[len] = 0; + ret = strict_strtol(pos, 10, &tmp2); + + if (!ret) + tmp2 = (tmp2 / 25) * 25; + } + + if (tmp1 < 0) + data = (u16)(-tmp1); + else + data = (u16)tmp1; + data = (data << AD7291_T_VALUE_FLOAT_OFFSET) | + (tmp2 & AD7291_T_VALUE_FLOAT_MASK); + if (tmp1 < 0) + /* convert positive value to supplyment */ + data = (AD7291_T_VALUE_SIGN << 1) - data; + + ret = ad7291_i2c_write(chip, bound_reg, data); + if (ret) + return -EIO; + + return ret; +} + +static ssize_t ad7291_show_t_sense_high(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return ad7291_show_t_bound(dev, attr, + AD7291_T_SENSE_HIGH, buf); +} + +static inline ssize_t ad7291_set_t_sense_high(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + return ad7291_set_t_bound(dev, attr, + AD7291_T_SENSE_HIGH, buf, len); +} + +static ssize_t ad7291_show_t_sense_low(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return ad7291_show_t_bound(dev, attr, + AD7291_T_SENSE_LOW, buf); +} + +static inline ssize_t ad7291_set_t_sense_low(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + return ad7291_set_t_bound(dev, attr, + AD7291_T_SENSE_LOW, buf, len); +} + +static ssize_t ad7291_show_t_sense_hyst(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return ad7291_show_t_bound(dev, attr, + AD7291_T_SENSE_HYST, buf); +} + +static inline ssize_t ad7291_set_t_sense_hyst(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + return ad7291_set_t_bound(dev, attr, + AD7291_T_SENSE_HYST, buf, len); +} + +static inline ssize_t ad7291_show_v_bound(struct device *dev, + struct device_attribute *attr, + u8 bound_reg, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + u16 data; + int ret; + + if (bound_reg < AD7291_VOLTAGE_LIMIT_BASE || + bound_reg >= AD7291_VOLTAGE_LIMIT_BASE + + AD7291_VOLTAGE_LIMIT_COUNT) + return -EINVAL; + + ret = ad7291_i2c_read(chip, bound_reg, &data); + if (ret) + return -EIO; + + data &= AD7291_VALUE_MASK; + + return sprintf(buf, "%d\n", data); +} + +static inline ssize_t ad7291_set_v_bound(struct device *dev, + struct device_attribute *attr, + u8 bound_reg, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7291_chip_info *chip = dev_info->dev_data; + unsigned long value; + u16 data; + int ret; + + if (bound_reg < AD7291_VOLTAGE_LIMIT_BASE || + bound_reg >= AD7291_VOLTAGE_LIMIT_BASE + + AD7291_VOLTAGE_LIMIT_COUNT) + return -EINVAL; + + ret = strict_strtoul(buf, 10, &value); + + if (ret || value >= 4096) + return -EINVAL; + + data = (u16)value; + ret = ad7291_i2c_write(chip, bound_reg, data); + if (ret) + return -EIO; + + return ret; +} + +static int ad7291_get_voltage_limit_regs(const char *channel) +{ + int index; + + if (strlen(channel) < 3 && channel[0] != 'v') + return -EINVAL; + + index = channel[1] - '0'; + if (index >= AD7291_VOLTAGE_LIMIT_COUNT) + return -EINVAL; + + return index; +} + +static ssize_t ad7291_show_voltage_high(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int regs; + + regs = ad7291_get_voltage_limit_regs(attr->attr.name); + + if (regs < 0) + return regs; + + return ad7291_show_t_bound(dev, attr, regs, buf); +} + +static inline ssize_t ad7291_set_voltage_high(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + int regs; + + regs = ad7291_get_voltage_limit_regs(attr->attr.name); + + if (regs < 0) + return regs; + + return ad7291_set_t_bound(dev, attr, regs, buf, len); +} + +static ssize_t ad7291_show_voltage_low(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int regs; + + regs = ad7291_get_voltage_limit_regs(attr->attr.name); + + if (regs < 0) + return regs; + + return ad7291_show_t_bound(dev, attr, regs+1, buf); +} + +static inline ssize_t ad7291_set_voltage_low(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + int regs; + + regs = ad7291_get_voltage_limit_regs(attr->attr.name); + + if (regs < 0) + return regs; + + return ad7291_set_t_bound(dev, attr, regs+1, buf, len); +} + +static ssize_t ad7291_show_voltage_hyst(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int regs; + + regs = ad7291_get_voltage_limit_regs(attr->attr.name); + + if (regs < 0) + return regs; + + return ad7291_show_t_bound(dev, attr, regs+2, buf); +} + +static inline ssize_t ad7291_set_voltage_hyst(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + int regs; + + regs = ad7291_get_voltage_limit_regs(attr->attr.name); + + if (regs < 0) + return regs; + + return ad7291_set_t_bound(dev, attr, regs+2, buf, len); +} + +IIO_EVENT_ATTR_SH(t_sense_high, iio_event_ad7291, + ad7291_show_t_sense_high, ad7291_set_t_sense_high, 0); +IIO_EVENT_ATTR_SH(t_sense_low, iio_event_ad7291, + ad7291_show_t_sense_low, ad7291_set_t_sense_low, 0); +IIO_EVENT_ATTR_SH(t_sense_hyst, iio_event_ad7291, + ad7291_show_t_sense_hyst, ad7291_set_t_sense_hyst, 0); + +IIO_EVENT_ATTR_SH(v0_high, iio_event_ad7291, + ad7291_show_voltage_high, ad7291_set_voltage_high, 0); +IIO_EVENT_ATTR_SH(v0_low, iio_event_ad7291, + ad7291_show_voltage_low, ad7291_set_voltage_low, 0); +IIO_EVENT_ATTR_SH(v0_hyst, iio_event_ad7291, + ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); +IIO_EVENT_ATTR_SH(v1_high, iio_event_ad7291, + ad7291_show_voltage_high, ad7291_set_voltage_high, 0); +IIO_EVENT_ATTR_SH(v1_low, iio_event_ad7291, + ad7291_show_voltage_low, ad7291_set_voltage_low, 0); +IIO_EVENT_ATTR_SH(v1_hyst, iio_event_ad7291, + ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); +IIO_EVENT_ATTR_SH(v2_high, iio_event_ad7291, + ad7291_show_voltage_high, ad7291_set_voltage_high, 0); +IIO_EVENT_ATTR_SH(v2_low, iio_event_ad7291, + ad7291_show_voltage_low, ad7291_set_voltage_low, 0); +IIO_EVENT_ATTR_SH(v2_hyst, iio_event_ad7291, + ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); +IIO_EVENT_ATTR_SH(v3_high, iio_event_ad7291, + ad7291_show_voltage_high, ad7291_set_voltage_high, 0); +IIO_EVENT_ATTR_SH(v3_low, iio_event_ad7291, + ad7291_show_voltage_low, ad7291_set_voltage_low, 0); +IIO_EVENT_ATTR_SH(v3_hyst, iio_event_ad7291, + ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); +IIO_EVENT_ATTR_SH(v4_high, iio_event_ad7291, + ad7291_show_voltage_high, ad7291_set_voltage_high, 0); +IIO_EVENT_ATTR_SH(v4_low, iio_event_ad7291, + ad7291_show_voltage_low, ad7291_set_voltage_low, 0); +IIO_EVENT_ATTR_SH(v4_hyst, iio_event_ad7291, + ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); +IIO_EVENT_ATTR_SH(v5_high, iio_event_ad7291, + ad7291_show_voltage_high, ad7291_set_voltage_high, 0); +IIO_EVENT_ATTR_SH(v5_low, iio_event_ad7291, + ad7291_show_voltage_low, ad7291_set_voltage_low, 0); +IIO_EVENT_ATTR_SH(v5_hyst, iio_event_ad7291, + ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); +IIO_EVENT_ATTR_SH(v6_high, iio_event_ad7291, + ad7291_show_voltage_high, ad7291_set_voltage_high, 0); +IIO_EVENT_ATTR_SH(v6_low, iio_event_ad7291, + ad7291_show_voltage_low, ad7291_set_voltage_low, 0); +IIO_EVENT_ATTR_SH(v6_hyst, iio_event_ad7291, + ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); +IIO_EVENT_ATTR_SH(v7_high, iio_event_ad7291, + ad7291_show_voltage_high, ad7291_set_voltage_high, 0); +IIO_EVENT_ATTR_SH(v7_low, iio_event_ad7291, + ad7291_show_voltage_low, ad7291_set_voltage_low, 0); +IIO_EVENT_ATTR_SH(v7_hyst, iio_event_ad7291, + ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); + +static struct attribute *ad7291_event_attributes[] = { + &iio_event_attr_t_sense_high.dev_attr.attr, + &iio_event_attr_t_sense_low.dev_attr.attr, + &iio_event_attr_t_sense_hyst.dev_attr.attr, + &iio_event_attr_v0_high.dev_attr.attr, + &iio_event_attr_v0_low.dev_attr.attr, + &iio_event_attr_v0_hyst.dev_attr.attr, + &iio_event_attr_v1_high.dev_attr.attr, + &iio_event_attr_v1_low.dev_attr.attr, + &iio_event_attr_v1_hyst.dev_attr.attr, + &iio_event_attr_v2_high.dev_attr.attr, + &iio_event_attr_v2_low.dev_attr.attr, + &iio_event_attr_v2_hyst.dev_attr.attr, + &iio_event_attr_v3_high.dev_attr.attr, + &iio_event_attr_v3_low.dev_attr.attr, + &iio_event_attr_v3_hyst.dev_attr.attr, + &iio_event_attr_v4_high.dev_attr.attr, + &iio_event_attr_v4_low.dev_attr.attr, + &iio_event_attr_v4_hyst.dev_attr.attr, + &iio_event_attr_v5_high.dev_attr.attr, + &iio_event_attr_v5_low.dev_attr.attr, + &iio_event_attr_v5_hyst.dev_attr.attr, + &iio_event_attr_v6_high.dev_attr.attr, + &iio_event_attr_v6_low.dev_attr.attr, + &iio_event_attr_v6_hyst.dev_attr.attr, + &iio_event_attr_v7_high.dev_attr.attr, + &iio_event_attr_v7_low.dev_attr.attr, + &iio_event_attr_v7_hyst.dev_attr.attr, + NULL, +}; + +static struct attribute_group ad7291_event_attribute_group = { + .attrs = ad7291_event_attributes, +}; + +/* + * device probe and remove + */ + +static int __devinit ad7291_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct ad7291_chip_info *chip; + int ret = 0; + + chip = kzalloc(sizeof(struct ad7291_chip_info), GFP_KERNEL); + + if (chip == NULL) + return -ENOMEM; + + /* this is only used for device removal purposes */ + i2c_set_clientdata(client, chip); + + chip->client = client; + chip->name = id->name; + chip->command = AD7291_NOISE_DELAY | AD7291_T_SENSE_MASK; + + chip->indio_dev = iio_allocate_device(); + if (chip->indio_dev == NULL) { + ret = -ENOMEM; + goto error_free_chip; + } + + chip->indio_dev->dev.parent = &client->dev; + chip->indio_dev->attrs = &ad7291_attribute_group; + chip->indio_dev->event_attrs = &ad7291_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; + + if (client->irq > 0) { + ret = iio_register_interrupt_line(client->irq, + chip->indio_dev, + 0, + IRQF_TRIGGER_LOW, + chip->name); + if (ret) + goto error_unreg_dev; + + /* + * The event handler list element refer to iio_event_ad7291. + * All event attributes bind to the same event handler. + * So, only register event handler once. + */ + iio_add_event_to_list(&iio_event_ad7291, + &chip->indio_dev->interrupts[0]->ev_list); + + INIT_WORK(&chip->thresh_work, ad7291_interrupt_bh); + + /* set irq polarity low level */ + chip->command |= AD7291_ALART_POLARITY; + } + + ret = ad7291_i2c_write(chip, AD7291_COMMAND, chip->command); + if (ret) { + ret = -EIO; + goto error_unreg_irq; + } + + dev_info(&client->dev, "%s temperature sensor registered.\n", + id->name); + + return 0; + +error_unreg_irq: + iio_unregister_interrupt_line(chip->indio_dev, 0); +error_unreg_dev: + iio_device_unregister(chip->indio_dev); +error_free_dev: + iio_free_device(chip->indio_dev); +error_free_chip: + kfree(chip); + + return ret; +} + +static int __devexit ad7291_remove(struct i2c_client *client) +{ + struct ad7291_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); + iio_free_device(chip->indio_dev); + kfree(chip); + + return 0; +} + +static const struct i2c_device_id ad7291_id[] = { + { "ad7291", 0 }, + {} +}; + +MODULE_DEVICE_TABLE(i2c, ad7291_id); + +static struct i2c_driver ad7291_driver = { + .driver = { + .name = "ad7291", + }, + .probe = ad7291_probe, + .remove = __devexit_p(ad7291_remove), + .id_table = ad7291_id, +}; + +static __init int ad7291_init(void) +{ + return i2c_add_driver(&ad7291_driver); +} + +static __exit void ad7291_exit(void) +{ + i2c_del_driver(&ad7291_driver); +} + +MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>"); +MODULE_DESCRIPTION("Analog Devices AD7291 digital" + " temperature sensor driver"); +MODULE_LICENSE("GPL v2"); + +module_init(ad7291_init); +module_exit(ad7291_exit); |