diff options
Diffstat (limited to 'drivers/staging/iio/adc/ad7291.c')
| -rw-r--r-- | drivers/staging/iio/adc/ad7291.c | 716 |
1 files changed, 716 insertions, 0 deletions
diff --git a/drivers/staging/iio/adc/ad7291.c b/drivers/staging/iio/adc/ad7291.c new file mode 100644 index 00000000..d088c662 --- /dev/null +++ b/drivers/staging/iio/adc/ad7291.c @@ -0,0 +1,716 @@ +/* + * AD7291 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor + * + * Copyright 2010-2011 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/interrupt.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/events.h> + +/* + * Simplified handling + * + * If no events enabled - single polled channel read + * If event enabled direct reads disable unless channel + * is in the read mask. + * + * The noise-delayed bit as per datasheet suggestion is always enabled. + * + */ + +/* + * AD7291 registers definition + */ +#define AD7291_COMMAND 0x00 +#define AD7291_VOLTAGE 0x01 +#define AD7291_T_SENSE 0x02 +#define AD7291_T_AVERAGE 0x03 +#define AD7291_CH0_DATA_HIGH 0x04 +#define AD7291_CH0_DATA_LOW 0x05 +#define AD7291_CH0_HYST 0x06 +#define AD7291_CH1_DATA_HIGH 0x07 +#define AD7291_CH1_DATA_LOW 0x08 +#define AD7291_CH1_HYST 0x09 +#define AD7291_CH2_DATA_HIGH 0x0A +#define AD7291_CH2_DATA_LOW 0x0B +#define AD7291_CH2_HYST 0x0C +#define AD7291_CH3_DATA_HIGH 0x0D +#define AD7291_CH3_DATA_LOW 0x0E +#define AD7291_CH3_HYST 0x0F +#define AD7291_CH4_DATA_HIGH 0x10 +#define AD7291_CH4_DATA_LOW 0x11 +#define AD7291_CH4_HYST 0x12 +#define AD7291_CH5_DATA_HIGH 0x13 +#define AD7291_CH5_DATA_LOW 0x14 +#define AD7291_CH5_HYST 0x15 +#define AD7291_CH6_DATA_HIGH 0x16 +#define AD7291_CH6_DATA_LOW 0x17 +#define AD7291_CH6_HYST 0x18 +#define AD7291_CH7_DATA_HIGH 0x19 +#define AD7291_CH7_DATA_LOW 0x1A +#define AD7291_CH7_HYST 0x2B +#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 + +#define AD7291_VOLTAGE_LIMIT_COUNT 8 + + +/* + * AD7291 command + */ +#define AD7291_AUTOCYCLE (1 << 0) +#define AD7291_RESET (1 << 1) +#define AD7291_ALERT_CLEAR (1 << 2) +#define AD7291_ALERT_POLARITY (1 << 3) +#define AD7291_EXT_REF (1 << 4) +#define AD7291_NOISE_DELAY (1 << 5) +#define AD7291_T_SENSE_MASK (1 << 7) +#define AD7291_VOLTAGE_MASK 0xFF00 +#define AD7291_VOLTAGE_OFFSET 0x8 + +/* + * AD7291 value masks + */ +#define AD7291_CHANNEL_MASK 0xF000 +#define AD7291_BITS 12 +#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 + +#define AD7291_BITS 12 + +struct ad7291_chip_info { + struct i2c_client *client; + struct regulator *reg; + u16 int_vref_mv; + u16 command; + u16 c_mask; /* Active voltage channels for events */ + struct mutex state_lock; +}; + +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) +{ + return i2c_smbus_write_word_data(chip->client, reg, swab16(data)); +} + +static ssize_t ad7291_store_reset(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ad7291_chip_info *chip = iio_priv(indio_dev); + + return ad7291_i2c_write(chip, AD7291_COMMAND, + chip->command | AD7291_RESET); +} + +static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, ad7291_store_reset, 0); + +static struct attribute *ad7291_attributes[] = { + &iio_dev_attr_reset.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad7291_attribute_group = { + .attrs = ad7291_attributes, +}; + +static irqreturn_t ad7291_event_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct ad7291_chip_info *chip = iio_priv(private); + u16 t_status, v_status; + u16 command; + int i; + s64 timestamp = iio_get_time_ns(); + + if (ad7291_i2c_read(chip, AD7291_T_ALERT_STATUS, &t_status)) + return IRQ_HANDLED; + + if (ad7291_i2c_read(chip, AD7291_VOLTAGE_ALERT_STATUS, &v_status)) + return IRQ_HANDLED; + + if (!(t_status || v_status)) + return IRQ_HANDLED; + + command = chip->command | AD7291_ALERT_CLEAR; + ad7291_i2c_write(chip, AD7291_COMMAND, command); + + command = chip->command & ~AD7291_ALERT_CLEAR; + ad7291_i2c_write(chip, AD7291_COMMAND, command); + + /* For now treat t_sense and t_sense_average the same */ + if ((t_status & (1 << 0)) || (t_status & (1 << 2))) + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_TEMP, + 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING), + timestamp); + if ((t_status & (1 << 1)) || (t_status & (1 << 3))) + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_TEMP, + 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + timestamp); + + for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT*2; i += 2) { + if (v_status & (1 << i)) + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, + i/2, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING), + timestamp); + if (v_status & (1 << (i + 1))) + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, + i/2, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + timestamp); + } + + return IRQ_HANDLED; +} + +static inline ssize_t ad7291_show_hyst(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ad7291_chip_info *chip = iio_priv(indio_dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + u16 data; + int ret; + + ret = ad7291_i2c_read(chip, this_attr->address, &data); + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", data & AD7291_VALUE_MASK); +} + +static inline ssize_t ad7291_set_hyst(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ad7291_chip_info *chip = iio_priv(indio_dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + u16 data; + int ret; + + ret = kstrtou16(buf, 10, &data); + + if (ret < 0) + return ret; + if (data > AD7291_VALUE_MASK) + return -EINVAL; + + ret = ad7291_i2c_write(chip, this_attr->address, data); + if (ret < 0) + return ret; + + return len; +} + +static IIO_DEVICE_ATTR(in_temp0_thresh_both_hyst_raw, + S_IRUGO | S_IWUSR, + ad7291_show_hyst, ad7291_set_hyst, + AD7291_T_SENSE_HYST); +static IIO_DEVICE_ATTR(in_voltage0_thresh_both_hyst_raw, + S_IRUGO | S_IWUSR, + ad7291_show_hyst, ad7291_set_hyst, AD7291_CH0_HYST); +static IIO_DEVICE_ATTR(in_voltage1_thresh_both_hyst_raw, + S_IRUGO | S_IWUSR, + ad7291_show_hyst, ad7291_set_hyst, AD7291_CH1_HYST); +static IIO_DEVICE_ATTR(in_voltage2_thresh_both_hyst_raw, + S_IRUGO | S_IWUSR, + ad7291_show_hyst, ad7291_set_hyst, AD7291_CH2_HYST); +static IIO_DEVICE_ATTR(in_voltage3_thresh_both_hyst_raw, + S_IRUGO | S_IWUSR, + ad7291_show_hyst, ad7291_set_hyst, AD7291_CH3_HYST); +static IIO_DEVICE_ATTR(in_voltage4_thresh_both_hyst_raw, + S_IRUGO | S_IWUSR, + ad7291_show_hyst, ad7291_set_hyst, AD7291_CH4_HYST); +static IIO_DEVICE_ATTR(in_voltage5_thresh_both_hyst_raw, + S_IRUGO | S_IWUSR, + ad7291_show_hyst, ad7291_set_hyst, AD7291_CH5_HYST); +static IIO_DEVICE_ATTR(in_voltage6_thresh_both_hyst_raw, + S_IRUGO | S_IWUSR, + ad7291_show_hyst, ad7291_set_hyst, AD7291_CH6_HYST); +static IIO_DEVICE_ATTR(in_voltage7_thresh_both_hyst_raw, + S_IRUGO | S_IWUSR, + ad7291_show_hyst, ad7291_set_hyst, AD7291_CH7_HYST); + +static struct attribute *ad7291_event_attributes[] = { + &iio_dev_attr_in_temp0_thresh_both_hyst_raw.dev_attr.attr, + &iio_dev_attr_in_voltage0_thresh_both_hyst_raw.dev_attr.attr, + &iio_dev_attr_in_voltage1_thresh_both_hyst_raw.dev_attr.attr, + &iio_dev_attr_in_voltage2_thresh_both_hyst_raw.dev_attr.attr, + &iio_dev_attr_in_voltage3_thresh_both_hyst_raw.dev_attr.attr, + &iio_dev_attr_in_voltage4_thresh_both_hyst_raw.dev_attr.attr, + &iio_dev_attr_in_voltage5_thresh_both_hyst_raw.dev_attr.attr, + &iio_dev_attr_in_voltage6_thresh_both_hyst_raw.dev_attr.attr, + &iio_dev_attr_in_voltage7_thresh_both_hyst_raw.dev_attr.attr, + NULL, +}; + +/* high / low */ +static u8 ad7291_limit_regs[9][2] = { + { AD7291_CH0_DATA_HIGH, AD7291_CH0_DATA_LOW }, + { AD7291_CH1_DATA_HIGH, AD7291_CH1_DATA_LOW }, + { AD7291_CH2_DATA_HIGH, AD7291_CH2_DATA_LOW }, + { AD7291_CH3_DATA_HIGH, AD7291_CH3_DATA_LOW }, /* FIXME: ? */ + { AD7291_CH4_DATA_HIGH, AD7291_CH4_DATA_LOW }, + { AD7291_CH5_DATA_HIGH, AD7291_CH5_DATA_LOW }, + { AD7291_CH6_DATA_HIGH, AD7291_CH6_DATA_LOW }, + { AD7291_CH7_DATA_HIGH, AD7291_CH7_DATA_LOW }, + /* temp */ + { AD7291_T_SENSE_HIGH, AD7291_T_SENSE_LOW }, +}; + +static int ad7291_read_event_value(struct iio_dev *indio_dev, + u64 event_code, + int *val) +{ + struct ad7291_chip_info *chip = iio_priv(indio_dev); + + int ret; + u8 reg; + u16 uval; + s16 signval; + + switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) { + case IIO_VOLTAGE: + reg = ad7291_limit_regs[IIO_EVENT_CODE_EXTRACT_CHAN(event_code)] + [!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) == + IIO_EV_DIR_RISING)]; + + ret = ad7291_i2c_read(chip, reg, &uval); + if (ret < 0) + return ret; + *val = uval & AD7291_VALUE_MASK; + return 0; + + case IIO_TEMP: + reg = ad7291_limit_regs[8] + [!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) == + IIO_EV_DIR_RISING)]; + + ret = ad7291_i2c_read(chip, reg, &signval); + if (ret < 0) + return ret; + signval = (s16)((signval & AD7291_VALUE_MASK) << 4) >> 4; + *val = signval; + return 0; + default: + return -EINVAL; + }; +} + +static int ad7291_write_event_value(struct iio_dev *indio_dev, + u64 event_code, + int val) +{ + struct ad7291_chip_info *chip = iio_priv(indio_dev); + u8 reg; + s16 signval; + + switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) { + case IIO_VOLTAGE: + if (val > AD7291_VALUE_MASK || val < 0) + return -EINVAL; + reg = ad7291_limit_regs[IIO_EVENT_CODE_EXTRACT_CHAN(event_code)] + [!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) == + IIO_EV_DIR_RISING)]; + return ad7291_i2c_write(chip, reg, val); + case IIO_TEMP: + if (val > 2047 || val < -2048) + return -EINVAL; + reg = ad7291_limit_regs[8] + [!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) == + IIO_EV_DIR_RISING)]; + signval = val; + return ad7291_i2c_write(chip, reg, *(u16 *)&signval); + default: + return -EINVAL; + }; +} + +static int ad7291_read_event_config(struct iio_dev *indio_dev, + u64 event_code) +{ + struct ad7291_chip_info *chip = iio_priv(indio_dev); + /* To be enabled the channel must simply be on. If any are enabled + we are in continuous sampling mode */ + + switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) { + case IIO_VOLTAGE: + if (chip->c_mask & + (1 << (15 - IIO_EVENT_CODE_EXTRACT_CHAN(event_code)))) + return 1; + else + return 0; + case IIO_TEMP: + /* always on */ + return 1; + default: + return -EINVAL; + } + +} + +static int ad7291_write_event_config(struct iio_dev *indio_dev, + u64 event_code, + int state) +{ + int ret = 0; + struct ad7291_chip_info *chip = iio_priv(indio_dev); + u16 regval; + + mutex_lock(&chip->state_lock); + regval = chip->command; + /* + * To be enabled the channel must simply be on. If any are enabled + * use continuous sampling mode. + * Possible to disable temp as well but that makes single read tricky. + */ + + switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) { + case IIO_VOLTAGE: + if ((!state) && (chip->c_mask & (1 << (15 - + IIO_EVENT_CODE_EXTRACT_CHAN(event_code))))) + chip->c_mask &= ~(1 << (15 - IIO_EVENT_CODE_EXTRACT_CHAN + (event_code))); + else if (state && (!(chip->c_mask & (1 << (15 - + IIO_EVENT_CODE_EXTRACT_CHAN(event_code)))))) + chip->c_mask |= (1 << (15 - IIO_EVENT_CODE_EXTRACT_CHAN + (event_code))); + else + break; + + regval &= ~AD7291_AUTOCYCLE; + regval |= chip->c_mask; + if (chip->c_mask) /* Enable autocycle? */ + regval |= AD7291_AUTOCYCLE; + + ret = ad7291_i2c_write(chip, AD7291_COMMAND, regval); + if (ret < 0) + goto error_ret; + + chip->command = regval; + break; + default: + ret = -EINVAL; + } + +error_ret: + mutex_unlock(&chip->state_lock); + return ret; +} + +static int ad7291_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long mask) +{ + int ret; + struct ad7291_chip_info *chip = iio_priv(indio_dev); + unsigned int scale_uv; + u16 regval; + s16 signval; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_VOLTAGE: + mutex_lock(&chip->state_lock); + /* If in autocycle mode drop through */ + if (chip->command & AD7291_AUTOCYCLE) { + mutex_unlock(&chip->state_lock); + return -EBUSY; + } + /* Enable this channel alone */ + regval = chip->command & (~AD7291_VOLTAGE_MASK); + regval |= 1 << (15 - chan->channel); + ret = ad7291_i2c_write(chip, AD7291_COMMAND, regval); + if (ret < 0) { + mutex_unlock(&chip->state_lock); + return ret; + } + /* Read voltage */ + ret = i2c_smbus_read_word_data(chip->client, + AD7291_VOLTAGE); + if (ret < 0) { + mutex_unlock(&chip->state_lock); + return ret; + } + *val = swab16((u16)ret) & AD7291_VALUE_MASK; + mutex_unlock(&chip->state_lock); + return IIO_VAL_INT; + case IIO_TEMP: + /* Assumes tsense bit of command register always set */ + ret = i2c_smbus_read_word_data(chip->client, + AD7291_T_SENSE); + if (ret < 0) + return ret; + signval = (s16)((swab16((u16)ret) & + AD7291_VALUE_MASK) << 4) >> 4; + *val = signval; + return IIO_VAL_INT; + default: + return -EINVAL; + } + case IIO_CHAN_INFO_AVERAGE_RAW: + ret = i2c_smbus_read_word_data(chip->client, + AD7291_T_AVERAGE); + if (ret < 0) + return ret; + signval = (s16)((swab16((u16)ret) & + AD7291_VALUE_MASK) << 4) >> 4; + *val = signval; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_VOLTAGE: + scale_uv = (chip->int_vref_mv * 1000) >> AD7291_BITS; + *val = scale_uv / 1000; + *val2 = (scale_uv % 1000) * 1000; + return IIO_VAL_INT_PLUS_MICRO; + case IIO_TEMP: + /* + * One LSB of the ADC corresponds to 0.25 deg C. + * The temperature reading is in 12-bit twos + * complement format + */ + *val = 250; + return IIO_VAL_INT; + default: + return -EINVAL; + } + default: + return -EINVAL; + } +} + +#define AD7291_VOLTAGE_CHAN(_chan) \ +{ \ + .type = IIO_VOLTAGE, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .indexed = 1, \ + .channel = _chan, \ + .event_mask = IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING)|\ + IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) \ +} + +static const struct iio_chan_spec ad7291_channels[] = { + AD7291_VOLTAGE_CHAN(0), + AD7291_VOLTAGE_CHAN(1), + AD7291_VOLTAGE_CHAN(2), + AD7291_VOLTAGE_CHAN(3), + AD7291_VOLTAGE_CHAN(4), + AD7291_VOLTAGE_CHAN(5), + AD7291_VOLTAGE_CHAN(6), + AD7291_VOLTAGE_CHAN(7), + { + .type = IIO_TEMP, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_AVERAGE_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .indexed = 1, + .channel = 0, + .event_mask = + IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING)| + IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) + } +}; + +static struct attribute_group ad7291_event_attribute_group = { + .attrs = ad7291_event_attributes, +}; + +static const struct iio_info ad7291_info = { + .attrs = &ad7291_attribute_group, + .read_raw = &ad7291_read_raw, + .read_event_config = &ad7291_read_event_config, + .write_event_config = &ad7291_write_event_config, + .read_event_value = &ad7291_read_event_value, + .write_event_value = &ad7291_write_event_value, + .event_attrs = &ad7291_event_attribute_group, +}; + +static int ad7291_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct ad7291_chip_info *chip; + struct iio_dev *indio_dev; + int ret = 0, voltage_uv = 0; + + indio_dev = iio_device_alloc(sizeof(*chip)); + if (indio_dev == NULL) { + ret = -ENOMEM; + goto error_ret; + } + chip = iio_priv(indio_dev); + + chip->reg = regulator_get(&client->dev, "vcc"); + if (!IS_ERR(chip->reg)) { + ret = regulator_enable(chip->reg); + if (ret) + goto error_put_reg; + voltage_uv = regulator_get_voltage(chip->reg); + } + + mutex_init(&chip->state_lock); + /* this is only used for device removal purposes */ + i2c_set_clientdata(client, indio_dev); + + chip->client = client; + + chip->command = AD7291_NOISE_DELAY | + AD7291_T_SENSE_MASK | /* Tsense always enabled */ + AD7291_ALERT_POLARITY; /* set irq polarity low level */ + + if (voltage_uv) { + chip->int_vref_mv = voltage_uv / 1000; + chip->command |= AD7291_EXT_REF; + } else { + chip->int_vref_mv = 2500; /* Build-in ref */ + } + + indio_dev->name = id->name; + indio_dev->channels = ad7291_channels; + indio_dev->num_channels = ARRAY_SIZE(ad7291_channels); + + indio_dev->dev.parent = &client->dev; + indio_dev->info = &ad7291_info; + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = ad7291_i2c_write(chip, AD7291_COMMAND, AD7291_RESET); + if (ret) { + ret = -EIO; + goto error_disable_reg; + } + + ret = ad7291_i2c_write(chip, AD7291_COMMAND, chip->command); + if (ret) { + ret = -EIO; + goto error_disable_reg; + } + + if (client->irq > 0) { + ret = request_threaded_irq(client->irq, + NULL, + &ad7291_event_handler, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + id->name, + indio_dev); + if (ret) + goto error_disable_reg; + } + + ret = iio_device_register(indio_dev); + if (ret) + goto error_unreg_irq; + + dev_info(&client->dev, "%s ADC registered.\n", + id->name); + + return 0; + +error_unreg_irq: + if (client->irq) + free_irq(client->irq, indio_dev); +error_disable_reg: + if (!IS_ERR(chip->reg)) + regulator_disable(chip->reg); +error_put_reg: + if (!IS_ERR(chip->reg)) + regulator_put(chip->reg); + + iio_device_free(indio_dev); +error_ret: + return ret; +} + +static int ad7291_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct ad7291_chip_info *chip = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + + if (client->irq) + free_irq(client->irq, indio_dev); + + if (!IS_ERR(chip->reg)) { + regulator_disable(chip->reg); + regulator_put(chip->reg); + } + + iio_device_free(indio_dev); + + 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 = KBUILD_MODNAME, + }, + .probe = ad7291_probe, + .remove = ad7291_remove, + .id_table = ad7291_id, +}; +module_i2c_driver(ad7291_driver); + +MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>"); +MODULE_DESCRIPTION("Analog Devices AD7291 ADC driver"); +MODULE_LICENSE("GPL v2"); |