| /* |
| * 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 "../iio.h" |
| #include "../sysfs.h" |
| #include "../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_get_drvdata(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_get_drvdata(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_get_drvdata(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 0: |
| 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 = IIO_CHAN_INFO_SCALE_SHARED_BIT, \ |
| .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 = IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT | |
| IIO_CHAN_INFO_SCALE_SEPARATE_BIT, |
| .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 __devinit 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_allocate_device(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_free_device(indio_dev); |
| error_ret: |
| return ret; |
| } |
| |
| static int __devexit 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_free_device(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 = __devexit_p(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"); |