--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ADS7138 - Texas Instruments Analog-to-Digital Converter
+ */
+
+#include <linux/bitfield.h>
+#include <linux/cleanup.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/unaligned.h>
+
+#include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/types.h>
+
+/*
+ * Always assume 16 bits resolution as HW registers are aligned like that and
+ * with enabled oversampling/averaging it actually corresponds to 16 bits.
+ */
+#define ADS7138_RES_BITS 16
+
+/* ADS7138 operation codes */
+#define ADS7138_OPCODE_SINGLE_WRITE 0x08
+#define ADS7138_OPCODE_SET_BIT 0x18
+#define ADS7138_OPCODE_CLEAR_BIT 0x20
+#define ADS7138_OPCODE_BLOCK_WRITE 0x28
+#define ADS7138_OPCODE_BLOCK_READ 0x30
+
+/* ADS7138 registers */
+#define ADS7138_REG_GENERAL_CFG 0x01
+#define ADS7138_REG_OSR_CFG 0x03
+#define ADS7138_REG_OPMODE_CFG 0x04
+#define ADS7138_REG_SEQUENCE_CFG 0x10
+#define ADS7138_REG_AUTO_SEQ_CH_SEL 0x12
+#define ADS7138_REG_ALERT_CH_SEL 0x14
+#define ADS7138_REG_EVENT_FLAG 0x18
+#define ADS7138_REG_EVENT_HIGH_FLAG 0x1A
+#define ADS7138_REG_EVENT_LOW_FLAG 0x1C
+#define ADS7138_REG_HIGH_TH_HYS_CH(x) ((x) * 4 + 0x20)
+#define ADS7138_REG_LOW_TH_CNT_CH(x) ((x) * 4 + 0x22)
+#define ADS7138_REG_MAX_LSB_CH(x) ((x) * 2 + 0x60)
+#define ADS7138_REG_MIN_LSB_CH(x) ((x) * 2 + 0x80)
+#define ADS7138_REG_RECENT_LSB_CH(x) ((x) * 2 + 0xA0)
+
+#define ADS7138_GENERAL_CFG_RST BIT(0)
+#define ADS7138_GENERAL_CFG_DWC_EN BIT(4)
+#define ADS7138_GENERAL_CFG_STATS_EN BIT(5)
+#define ADS7138_OSR_CFG_MASK GENMASK(2, 0)
+#define ADS7138_OPMODE_CFG_CONV_MODE BIT(5)
+#define ADS7138_OPMODE_CFG_FREQ_MASK GENMASK(4, 0)
+#define ADS7138_SEQUENCE_CFG_SEQ_MODE BIT(0)
+#define ADS7138_SEQUENCE_CFG_SEQ_START BIT(4)
+#define ADS7138_THRESHOLD_LSB_MASK GENMASK(7, 4)
+
+enum ads7138_modes {
+ ADS7138_MODE_MANUAL,
+ ADS7138_MODE_AUTO,
+};
+
+struct ads7138_chip_data {
+ const char *name;
+ const int channel_num;
+};
+
+struct ads7138_data {
+ /* Protects RMW access to the I2C interface */
+ struct mutex lock;
+ struct i2c_client *client;
+ struct regulator *vref_regu;
+ const struct ads7138_chip_data *chip_data;
+};
+
+/*
+ * 2D array of available sampling frequencies and the corresponding register
+ * values. Structured like this to be easily usable in read_avail function.
+ */
+static const int ads7138_samp_freqs_bits[2][26] = {
+ {
+ 163, 244, 326, 488, 651, 977, 1302, 1953,
+ 2604, 3906, 5208, 7813, 10417, 15625, 20833, 31250,
+ 41667, 62500, 83333, 125000, 166667, 250000, 333333, 500000,
+ 666667, 1000000
+ }, {
+ 0x1f, 0x1e, 0x1d, 0x1c, 0x1b, 0x1a, 0x19, 0x18,
+ 0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
+ /* Here is a hole, due to duplicate frequencies */
+ 0x09, 0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02,
+ 0x01, 0x00
+ }
+};
+
+static const int ads7138_oversampling_ratios[] = {
+ 1, 2, 4, 8, 16, 32, 64, 128
+};
+
+static int ads7138_i2c_write_block(const struct i2c_client *client, u8 reg,
+ u8 *values, u8 length)
+{
+ int ret;
+ int len = length + 2; /* "+ 2" for OPCODE and reg */
+
+ u8 *buf __free(kfree) = kmalloc(len, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ buf[0] = ADS7138_OPCODE_BLOCK_WRITE;
+ buf[1] = reg;
+ memcpy(&buf[2], values, length);
+
+ ret = i2c_master_send(client, buf, len);
+ if (ret < 0)
+ return ret;
+ if (ret != len)
+ return -EIO;
+
+ return 0;
+}
+
+static int ads7138_i2c_write_with_opcode(const struct i2c_client *client,
+ u8 reg, u8 regval, u8 opcode)
+{
+ u8 buf[3] = { opcode, reg, regval };
+ int ret;
+
+ ret = i2c_master_send(client, buf, ARRAY_SIZE(buf));
+ if (ret < 0)
+ return ret;
+ if (ret != ARRAY_SIZE(buf))
+ return -EIO;
+
+ return 0;
+}
+
+static int ads7138_i2c_write(const struct i2c_client *client, u8 reg, u8 value)
+{
+ return ads7138_i2c_write_with_opcode(client, reg, value,
+ ADS7138_OPCODE_SINGLE_WRITE);
+}
+
+static int ads7138_i2c_set_bit(const struct i2c_client *client, u8 reg, u8 bits)
+{
+ return ads7138_i2c_write_with_opcode(client, reg, bits,
+ ADS7138_OPCODE_SET_BIT);
+}
+
+static int ads7138_i2c_clear_bit(const struct i2c_client *client, u8 reg, u8 bits)
+{
+ return ads7138_i2c_write_with_opcode(client, reg, bits,
+ ADS7138_OPCODE_CLEAR_BIT);
+}
+
+static int ads7138_i2c_read_block(const struct i2c_client *client, u8 reg,
+ u8 *out_values, u8 length)
+{
+ u8 buf[2] = { ADS7138_OPCODE_BLOCK_READ, reg };
+ int ret;
+ struct i2c_msg msgs[] = {
+ {
+ .addr = client->addr,
+ .len = ARRAY_SIZE(buf),
+ .buf = buf,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = length,
+ .buf = out_values,
+ },
+ };
+
+ ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ if (ret < 0)
+ return ret;
+ if (ret != ARRAY_SIZE(msgs))
+ return -EIO;
+
+ return 0;
+}
+
+static int ads7138_i2c_read(const struct i2c_client *client, u8 reg)
+{
+ u8 value;
+ int ret;
+
+ ret = ads7138_i2c_read_block(client, reg, &value, sizeof(value));
+ if (ret)
+ return ret;
+ return value;
+}
+
+static int ads7138_freq_to_bits(int freq)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ads7138_samp_freqs_bits[0]); i++)
+ if (freq == ads7138_samp_freqs_bits[0][i])
+ return ads7138_samp_freqs_bits[1][i];
+
+ return -EINVAL;
+}
+
+static int ads7138_bits_to_freq(int bits)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ads7138_samp_freqs_bits[1]); i++)
+ if (bits == ads7138_samp_freqs_bits[1][i])
+ return ads7138_samp_freqs_bits[0][i];
+
+ return -EINVAL;
+}
+
+static int ads7138_osr_to_bits(int osr)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ads7138_oversampling_ratios); i++)
+ if (osr == ads7138_oversampling_ratios[i])
+ return i;
+
+ return -EINVAL;
+}
+
+static int ads7138_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct ads7138_data *data = iio_priv(indio_dev);
+ int ret, vref, bits;
+ u8 values[2];
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = ads7138_i2c_read_block(data->client,
+ ADS7138_REG_RECENT_LSB_CH(chan->channel),
+ values, ARRAY_SIZE(values));
+ if (ret)
+ return ret;
+
+ *val = get_unaligned_le16(values);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_PEAK:
+ ret = ads7138_i2c_read_block(data->client,
+ ADS7138_REG_MAX_LSB_CH(chan->channel),
+ values, ARRAY_SIZE(values));
+ if (ret)
+ return ret;
+
+ *val = get_unaligned_le16(values);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_TROUGH:
+ ret = ads7138_i2c_read_block(data->client,
+ ADS7138_REG_MIN_LSB_CH(chan->channel),
+ values, ARRAY_SIZE(values));
+ if (ret)
+ return ret;
+
+ *val = get_unaligned_le16(values);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = ads7138_i2c_read(data->client, ADS7138_REG_OPMODE_CFG);
+ if (ret < 0)
+ return ret;
+
+ bits = FIELD_GET(ADS7138_OPMODE_CFG_FREQ_MASK, ret);
+ *val = ads7138_bits_to_freq(bits);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ vref = regulator_get_voltage(data->vref_regu);
+ if (vref < 0)
+ return vref;
+ *val = vref / 1000;
+ *val2 = ADS7138_RES_BITS;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ ret = ads7138_i2c_read(data->client, ADS7138_REG_OSR_CFG);
+ if (ret < 0)
+ return ret;
+
+ bits = FIELD_GET(ADS7138_OSR_CFG_MASK, ret);
+ *val = ads7138_oversampling_ratios[bits];
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ads7138_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val,
+ int val2, long mask)
+{
+ struct ads7138_data *data = iio_priv(indio_dev);
+ int bits, ret;
+ u8 value;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ: {
+ bits = ads7138_freq_to_bits(val);
+ if (bits < 0)
+ return bits;
+
+ guard(mutex)(&data->lock);
+ ret = ads7138_i2c_read(data->client, ADS7138_REG_OPMODE_CFG);
+ if (ret < 0)
+ return ret;
+
+ value = ret & ~ADS7138_OPMODE_CFG_FREQ_MASK;
+ value |= FIELD_PREP(ADS7138_OPMODE_CFG_FREQ_MASK, bits);
+ return ads7138_i2c_write(data->client, ADS7138_REG_OPMODE_CFG,
+ value);
+ }
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ bits = ads7138_osr_to_bits(val);
+ if (bits < 0)
+ return bits;
+
+ return ads7138_i2c_write(data->client, ADS7138_REG_OSR_CFG,
+ bits);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ads7138_read_event(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info, int *val, int *val2)
+{
+ struct ads7138_data *data = iio_priv(indio_dev);
+ u8 reg, values[2];
+ int ret;
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ reg = (dir == IIO_EV_DIR_RISING) ?
+ ADS7138_REG_HIGH_TH_HYS_CH(chan->channel) :
+ ADS7138_REG_LOW_TH_CNT_CH(chan->channel);
+ ret = ads7138_i2c_read_block(data->client, reg, values,
+ ARRAY_SIZE(values));
+ if (ret)
+ return ret;
+
+ *val = ((values[1] << 4) | (values[0] >> 4));
+ return IIO_VAL_INT;
+ case IIO_EV_INFO_HYSTERESIS:
+ ret = ads7138_i2c_read(data->client,
+ ADS7138_REG_HIGH_TH_HYS_CH(chan->channel));
+ if (ret < 0)
+ return ret;
+
+ *val = ret & ~ADS7138_THRESHOLD_LSB_MASK;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ads7138_write_event(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info, int val, int val2)
+{
+ struct ads7138_data *data = iio_priv(indio_dev);
+ u8 reg, values[2];
+ int ret;
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE: {
+ if (val >= BIT(12) || val < 0)
+ return -EINVAL;
+
+ reg = (dir == IIO_EV_DIR_RISING) ?
+ ADS7138_REG_HIGH_TH_HYS_CH(chan->channel) :
+ ADS7138_REG_LOW_TH_CNT_CH(chan->channel);
+
+ guard(mutex)(&data->lock);
+ ret = ads7138_i2c_read(data->client, reg);
+ if (ret < 0)
+ return ret;
+
+ values[0] = ret & ~ADS7138_THRESHOLD_LSB_MASK;
+ values[0] |= FIELD_PREP(ADS7138_THRESHOLD_LSB_MASK, val);
+ values[1] = (val >> 4);
+ return ads7138_i2c_write_block(data->client, reg, values,
+ ARRAY_SIZE(values));
+ }
+ case IIO_EV_INFO_HYSTERESIS: {
+ if (val >= BIT(4) || val < 0)
+ return -EINVAL;
+
+ reg = ADS7138_REG_HIGH_TH_HYS_CH(chan->channel);
+
+ guard(mutex)(&data->lock);
+ ret = ads7138_i2c_read(data->client, reg);
+ if (ret < 0)
+ return ret;
+
+ values[0] = val & ~ADS7138_THRESHOLD_LSB_MASK;
+ values[0] |= FIELD_PREP(ADS7138_THRESHOLD_LSB_MASK, ret >> 4);
+ return ads7138_i2c_write(data->client, reg, values[0]);
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ads7138_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct ads7138_data *data = iio_priv(indio_dev);
+ int ret;
+
+ if (dir != IIO_EV_DIR_EITHER)
+ return -EINVAL;
+
+ ret = ads7138_i2c_read(data->client, ADS7138_REG_ALERT_CH_SEL);
+ if (ret < 0)
+ return ret;
+
+ return (ret & BIT(chan->channel)) ? 1 : 0;
+}
+
+static int ads7138_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir, bool state)
+{
+ struct ads7138_data *data = iio_priv(indio_dev);
+
+ if (dir != IIO_EV_DIR_EITHER)
+ return -EINVAL;
+
+ if (state)
+ return ads7138_i2c_set_bit(data->client,
+ ADS7138_REG_ALERT_CH_SEL,
+ BIT(chan->channel));
+ else
+ return ads7138_i2c_clear_bit(data->client,
+ ADS7138_REG_ALERT_CH_SEL,
+ BIT(chan->channel));
+}
+
+static int ads7138_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length,
+ long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *vals = ads7138_samp_freqs_bits[0];
+ *length = ARRAY_SIZE(ads7138_samp_freqs_bits[0]);
+ *type = IIO_VAL_INT;
+
+ return IIO_AVAIL_LIST;
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ *vals = ads7138_oversampling_ratios;
+ *length = ARRAY_SIZE(ads7138_oversampling_ratios);
+ *type = IIO_VAL_INT;
+
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info ti_ads7138_info = {
+ .read_raw = &ads7138_read_raw,
+ .read_avail = &ads7138_read_avail,
+ .write_raw = &ads7138_write_raw,
+ .read_event_value = &ads7138_read_event,
+ .write_event_value = &ads7138_write_event,
+ .read_event_config = &ads7138_read_event_config,
+ .write_event_config = &ads7138_write_event_config,
+};
+
+static const struct iio_event_spec ads7138_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE)
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS) |
+ BIT(IIO_EV_INFO_ENABLE),
+ },
+};
+
+#define ADS7138_V_CHAN(_chan) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = _chan, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_PEAK) | \
+ BIT(IIO_CHAN_INFO_TROUGH), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
+ BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+ .info_mask_shared_by_type_available = \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+ .datasheet_name = "AIN"#_chan, \
+ .event_spec = ads7138_events, \
+ .num_event_specs = ARRAY_SIZE(ads7138_events), \
+}
+
+static const struct iio_chan_spec ads7138_channels[] = {
+ ADS7138_V_CHAN(0),
+ ADS7138_V_CHAN(1),
+ ADS7138_V_CHAN(2),
+ ADS7138_V_CHAN(3),
+ ADS7138_V_CHAN(4),
+ ADS7138_V_CHAN(5),
+ ADS7138_V_CHAN(6),
+ ADS7138_V_CHAN(7),
+};
+
+static irqreturn_t ads7138_event_handler(int irq, void *priv)
+{
+ struct iio_dev *indio_dev = priv;
+ struct ads7138_data *data = iio_priv(indio_dev);
+ struct device *dev = &data->client->dev;
+ u8 i, events_high, events_low;
+ u64 code;
+ int ret;
+
+ /* Check if interrupt was trigger by us */
+ ret = ads7138_i2c_read(data->client, ADS7138_REG_EVENT_FLAG);
+ if (ret <= 0)
+ return IRQ_NONE;
+
+ ret = ads7138_i2c_read(data->client, ADS7138_REG_EVENT_HIGH_FLAG);
+ if (ret < 0) {
+ dev_warn(dev, "Failed to read event high flags: %d\n", ret);
+ return IRQ_HANDLED;
+ }
+ events_high = ret;
+
+ ret = ads7138_i2c_read(data->client, ADS7138_REG_EVENT_LOW_FLAG);
+ if (ret < 0) {
+ dev_warn(dev, "Failed to read event low flags: %d\n", ret);
+ return IRQ_HANDLED;
+ }
+ events_low = ret;
+
+ for (i = 0; i < data->chip_data->channel_num; i++) {
+ if (events_high & BIT(i)) {
+ code = IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, i,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_RISING);
+ iio_push_event(indio_dev, code,
+ iio_get_time_ns(indio_dev));
+ }
+ if (events_low & BIT(i)) {
+ code = IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, i,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_FALLING);
+ iio_push_event(indio_dev, code,
+ iio_get_time_ns(indio_dev));
+ }
+ }
+
+ /* Try to clear all interrupt flags */
+ ret = ads7138_i2c_write(data->client, ADS7138_REG_EVENT_HIGH_FLAG, 0xFF);
+ if (ret)
+ dev_warn(dev, "Failed to clear event high flags: %d\n", ret);
+
+ ret = ads7138_i2c_write(data->client, ADS7138_REG_EVENT_LOW_FLAG, 0xFF);
+ if (ret)
+ dev_warn(dev, "Failed to clear event low flags: %d\n", ret);
+
+ return IRQ_HANDLED;
+}
+
+static int ads7138_set_conv_mode(struct ads7138_data *data,
+ enum ads7138_modes mode)
+{
+ if (mode == ADS7138_MODE_AUTO)
+ return ads7138_i2c_set_bit(data->client, ADS7138_REG_OPMODE_CFG,
+ ADS7138_OPMODE_CFG_CONV_MODE);
+ return ads7138_i2c_clear_bit(data->client, ADS7138_REG_OPMODE_CFG,
+ ADS7138_OPMODE_CFG_CONV_MODE);
+}
+
+static int ads7138_init_hw(struct ads7138_data *data)
+{
+ struct device *dev = &data->client->dev;
+ int ret;
+
+ data->vref_regu = devm_regulator_get(dev, "avdd");
+ if (IS_ERR(data->vref_regu))
+ return dev_err_probe(dev, PTR_ERR(data->vref_regu),
+ "Failed to get avdd regulator\n");
+
+ ret = regulator_get_voltage(data->vref_regu);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "Failed to get avdd voltage\n");
+
+ /* Reset the chip to get a defined starting configuration */
+ ret = ads7138_i2c_set_bit(data->client, ADS7138_REG_GENERAL_CFG,
+ ADS7138_GENERAL_CFG_RST);
+ if (ret)
+ return ret;
+
+ ret = ads7138_set_conv_mode(data, ADS7138_MODE_AUTO);
+ if (ret)
+ return ret;
+
+ /* Enable statistics and digital window comparator */
+ ret = ads7138_i2c_set_bit(data->client, ADS7138_REG_GENERAL_CFG,
+ ADS7138_GENERAL_CFG_STATS_EN |
+ ADS7138_GENERAL_CFG_DWC_EN);
+ if (ret)
+ return ret;
+
+ /* Enable all channels for auto sequencing */
+ ret = ads7138_i2c_set_bit(data->client, ADS7138_REG_AUTO_SEQ_CH_SEL, 0xFF);
+ if (ret)
+ return ret;
+
+ /* Set auto sequence mode and start sequencing */
+ return ads7138_i2c_set_bit(data->client, ADS7138_REG_SEQUENCE_CFG,
+ ADS7138_SEQUENCE_CFG_SEQ_START |
+ ADS7138_SEQUENCE_CFG_SEQ_MODE);
+}
+
+static int ads7138_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct iio_dev *indio_dev;
+ struct ads7138_data *data;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ data->client = client;
+ data->chip_data = i2c_get_match_data(client);
+ if (!data->chip_data)
+ return -ENODEV;
+
+ ret = devm_mutex_init(dev, &data->lock);
+ if (ret)
+ return ret;
+
+ indio_dev->name = data->chip_data->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = ads7138_channels;
+ indio_dev->num_channels = ARRAY_SIZE(ads7138_channels);
+ indio_dev->info = &ti_ads7138_info;
+
+ i2c_set_clientdata(client, indio_dev);
+
+ if (client->irq > 0) {
+ ret = devm_request_threaded_irq(dev, client->irq,
+ NULL, ads7138_event_handler,
+ IRQF_TRIGGER_LOW |
+ IRQF_ONESHOT | IRQF_SHARED,
+ client->name, indio_dev);
+ if (ret)
+ return ret;
+ }
+
+ ret = ads7138_init_hw(data);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to initialize device\n");
+
+ ret = devm_iio_device_register(dev, indio_dev);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to register iio device\n");
+
+ return 0;
+}
+
+static int ads7138_runtime_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ads7138_data *data = iio_priv(indio_dev);
+
+ return ads7138_set_conv_mode(data, ADS7138_MODE_MANUAL);
+}
+
+static int ads7138_runtime_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ads7138_data *data = iio_priv(indio_dev);
+
+ return ads7138_set_conv_mode(data, ADS7138_MODE_AUTO);
+}
+
+static DEFINE_RUNTIME_DEV_PM_OPS(ads7138_pm_ops,
+ ads7138_runtime_suspend,
+ ads7138_runtime_resume,
+ NULL);
+
+static const struct ads7138_chip_data ads7128_data = {
+ .name = "ads7128",
+ .channel_num = 8,
+};
+
+static const struct ads7138_chip_data ads7138_data = {
+ .name = "ads7138",
+ .channel_num = 8,
+};
+
+static const struct of_device_id ads7138_of_match[] = {
+ { .compatible = "ti,ads7128", .data = &ads7128_data },
+ { .compatible = "ti,ads7138", .data = &ads7138_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ads7138_of_match);
+
+static const struct i2c_device_id ads7138_device_ids[] = {
+ { "ads7128", (kernel_ulong_t)&ads7128_data },
+ { "ads7138", (kernel_ulong_t)&ads7138_data },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ads7138_device_ids);
+
+static struct i2c_driver ads7138_driver = {
+ .driver = {
+ .name = "ads7138",
+ .of_match_table = ads7138_of_match,
+ .pm = pm_ptr(&ads7138_pm_ops),
+ },
+ .id_table = ads7138_device_ids,
+ .probe = ads7138_probe,
+};
+module_i2c_driver(ads7138_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Tobias Sperling <tobias.sperling@softing.com>");
+MODULE_DESCRIPTION("Driver for TI ADS7138 ADCs");
projects / thirdparty / kernel / linux.git / commitdiff
