// SPDX-License-Identifier: GPL-2.0
/*
 * Texas Instruments ADS7950 SPI ADC driver
 *
 * Copyright 2016 David Lechner <david@lechnology.com>
 *
 * Based on iio/ad7923.c:
 * Copyright 2011 Analog Devices Inc
 * Copyright 2012 CS Systemes d'Information
 *
 * And also on hwmon/ads79xx.c
 * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com/
 *      Nishanth Menon
 */

#include <linux/acpi.h>
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>

#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>

/*
 * In case of ACPI, we use the 5000 mV as default for the reference pin.
 * Device tree users encode that via the vref-supply regulator.
 */
#define TI_ADS7950_VA_MV_ACPI_DEFAULT   5000

#define TI_ADS7950_CR_GPIO      BIT(14)
#define TI_ADS7950_CR_MANUAL    BIT(12)
#define TI_ADS7950_CR_WRITE     BIT(11)
#define TI_ADS7950_CR_CHAN(ch)  ((ch) << 7)
#define TI_ADS7950_CR_RANGE_5V  BIT(6)
#define TI_ADS7950_CR_GPIO_DATA BIT(4)

#define TI_ADS7950_MAX_CHAN     16
#define TI_ADS7950_NUM_GPIOS    4

#define TI_ADS7950_TIMESTAMP_SIZE (sizeof(int64_t) / sizeof(__be16))

/* val = value, dec = left shift, bits = number of bits of the mask */
#define TI_ADS7950_EXTRACT(val, dec, bits) \
        (((val) >> (dec)) & ((1 << (bits)) - 1))

#define TI_ADS7950_MAN_CMD(cmd)         (TI_ADS7950_CR_MANUAL | (cmd))
#define TI_ADS7950_GPIO_CMD(cmd)        (TI_ADS7950_CR_GPIO | (cmd))

/* Manual mode configuration */
#define TI_ADS7950_MAN_CMD_SETTINGS(st) \
        (TI_ADS7950_MAN_CMD(TI_ADS7950_CR_WRITE | st->cmd_settings_bitmask))
/* GPIO mode configuration */
#define TI_ADS7950_GPIO_CMD_SETTINGS(st) \
        (TI_ADS7950_GPIO_CMD(st->gpio_cmd_settings_bitmask))

struct ti_ads7950_state {
        struct spi_device       *spi;
        struct spi_transfer     ring_xfer;
        struct spi_transfer     scan_single_xfer[3];
        struct spi_message      ring_msg;
        struct spi_message      scan_single_msg;

        /* Lock to protect the spi xfer buffers */
        struct mutex            slock;
        struct gpio_chip        chip;

        struct regulator        *reg;
        unsigned int            vref_mv;

        /*
         * Bitmask of lower 7 bits used for configuration
         * These bits only can be written when TI_ADS7950_CR_WRITE
         * is set, otherwise it retains its original state.
         * [0-3] GPIO signal
         * [4]   Set following frame to return GPIO signal values
         * [5]   Powers down device
         * [6]   Sets Vref range1(2.5v) or range2(5v)
         *
         * Bits present on Manual/Auto1/Auto2 commands
         */
        unsigned int            cmd_settings_bitmask;

        /*
         * Bitmask of GPIO command
         * [0-3] GPIO direction
         * [4-6] Different GPIO alarm mode configurations
         * [7]   GPIO 2 as device range input
         * [8]   GPIO 3 as device power down input
         * [9]   Reset all registers
         * [10-11] N/A
         */
        unsigned int            gpio_cmd_settings_bitmask;

        /*
         * DMA (thus cache coherency maintenance) may require the
         * transfer buffers to live in their own cache lines.
         */
        u16 rx_buf[TI_ADS7950_MAX_CHAN + 2 + TI_ADS7950_TIMESTAMP_SIZE]
                __aligned(IIO_DMA_MINALIGN);
        u16 tx_buf[TI_ADS7950_MAX_CHAN + 2];
        u16 single_tx;
        u16 single_rx;

};

struct ti_ads7950_chip_info {
        const struct iio_chan_spec *channels;
        unsigned int num_channels;
};

enum ti_ads7950_id {
        TI_ADS7950,
        TI_ADS7951,
        TI_ADS7952,
        TI_ADS7953,
        TI_ADS7954,
        TI_ADS7955,
        TI_ADS7956,
        TI_ADS7957,
        TI_ADS7958,
        TI_ADS7959,
        TI_ADS7960,
        TI_ADS7961,
};

#define TI_ADS7950_V_CHAN(index, bits)                          \
{                                                               \
        .type = IIO_VOLTAGE,                                    \
        .indexed = 1,                                           \
        .channel = index,                                       \
        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),           \
        .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),   \
        .address = index,                                       \
        .datasheet_name = "CH##index",                          \
        .scan_index = index,                                    \
        .scan_type = {                                          \
                .sign = 'u',                                    \
                .realbits = bits,                               \
                .storagebits = 16,                              \
                .shift = 12 - (bits),                           \
                .endianness = IIO_CPU,                          \
        },                                                      \
}

#define DECLARE_TI_ADS7950_4_CHANNELS(name, bits) \
const struct iio_chan_spec name ## _channels[] = { \
        TI_ADS7950_V_CHAN(0, bits), \
        TI_ADS7950_V_CHAN(1, bits), \
        TI_ADS7950_V_CHAN(2, bits), \
        TI_ADS7950_V_CHAN(3, bits), \
        IIO_CHAN_SOFT_TIMESTAMP(4), \
}

#define DECLARE_TI_ADS7950_8_CHANNELS(name, bits) \
const struct iio_chan_spec name ## _channels[] = { \
        TI_ADS7950_V_CHAN(0, bits), \
        TI_ADS7950_V_CHAN(1, bits), \
        TI_ADS7950_V_CHAN(2, bits), \
        TI_ADS7950_V_CHAN(3, bits), \
        TI_ADS7950_V_CHAN(4, bits), \
        TI_ADS7950_V_CHAN(5, bits), \
        TI_ADS7950_V_CHAN(6, bits), \
        TI_ADS7950_V_CHAN(7, bits), \
        IIO_CHAN_SOFT_TIMESTAMP(8), \
}

#define DECLARE_TI_ADS7950_12_CHANNELS(name, bits) \
const struct iio_chan_spec name ## _channels[] = { \
        TI_ADS7950_V_CHAN(0, bits), \
        TI_ADS7950_V_CHAN(1, bits), \
        TI_ADS7950_V_CHAN(2, bits), \
        TI_ADS7950_V_CHAN(3, bits), \
        TI_ADS7950_V_CHAN(4, bits), \
        TI_ADS7950_V_CHAN(5, bits), \
        TI_ADS7950_V_CHAN(6, bits), \
        TI_ADS7950_V_CHAN(7, bits), \
        TI_ADS7950_V_CHAN(8, bits), \
        TI_ADS7950_V_CHAN(9, bits), \
        TI_ADS7950_V_CHAN(10, bits), \
        TI_ADS7950_V_CHAN(11, bits), \
        IIO_CHAN_SOFT_TIMESTAMP(12), \
}

#define DECLARE_TI_ADS7950_16_CHANNELS(name, bits) \
const struct iio_chan_spec name ## _channels[] = { \
        TI_ADS7950_V_CHAN(0, bits), \
        TI_ADS7950_V_CHAN(1, bits), \
        TI_ADS7950_V_CHAN(2, bits), \
        TI_ADS7950_V_CHAN(3, bits), \
        TI_ADS7950_V_CHAN(4, bits), \
        TI_ADS7950_V_CHAN(5, bits), \
        TI_ADS7950_V_CHAN(6, bits), \
        TI_ADS7950_V_CHAN(7, bits), \
        TI_ADS7950_V_CHAN(8, bits), \
        TI_ADS7950_V_CHAN(9, bits), \
        TI_ADS7950_V_CHAN(10, bits), \
        TI_ADS7950_V_CHAN(11, bits), \
        TI_ADS7950_V_CHAN(12, bits), \
        TI_ADS7950_V_CHAN(13, bits), \
        TI_ADS7950_V_CHAN(14, bits), \
        TI_ADS7950_V_CHAN(15, bits), \
        IIO_CHAN_SOFT_TIMESTAMP(16), \
}

static DECLARE_TI_ADS7950_4_CHANNELS(ti_ads7950, 12);
static DECLARE_TI_ADS7950_8_CHANNELS(ti_ads7951, 12);
static DECLARE_TI_ADS7950_12_CHANNELS(ti_ads7952, 12);
static DECLARE_TI_ADS7950_16_CHANNELS(ti_ads7953, 12);
static DECLARE_TI_ADS7950_4_CHANNELS(ti_ads7954, 10);
static DECLARE_TI_ADS7950_8_CHANNELS(ti_ads7955, 10);
static DECLARE_TI_ADS7950_12_CHANNELS(ti_ads7956, 10);
static DECLARE_TI_ADS7950_16_CHANNELS(ti_ads7957, 10);
static DECLARE_TI_ADS7950_4_CHANNELS(ti_ads7958, 8);
static DECLARE_TI_ADS7950_8_CHANNELS(ti_ads7959, 8);
static DECLARE_TI_ADS7950_12_CHANNELS(ti_ads7960, 8);
static DECLARE_TI_ADS7950_16_CHANNELS(ti_ads7961, 8);

static const struct ti_ads7950_chip_info ti_ads7950_chip_info[] = {
        [TI_ADS7950] = {
                .channels       = ti_ads7950_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7950_channels),
        },
        [TI_ADS7951] = {
                .channels       = ti_ads7951_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7951_channels),
        },
        [TI_ADS7952] = {
                .channels       = ti_ads7952_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7952_channels),
        },
        [TI_ADS7953] = {
                .channels       = ti_ads7953_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7953_channels),
        },
        [TI_ADS7954] = {
                .channels       = ti_ads7954_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7954_channels),
        },
        [TI_ADS7955] = {
                .channels       = ti_ads7955_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7955_channels),
        },
        [TI_ADS7956] = {
                .channels       = ti_ads7956_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7956_channels),
        },
        [TI_ADS7957] = {
                .channels       = ti_ads7957_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7957_channels),
        },
        [TI_ADS7958] = {
                .channels       = ti_ads7958_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7958_channels),
        },
        [TI_ADS7959] = {
                .channels       = ti_ads7959_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7959_channels),
        },
        [TI_ADS7960] = {
                .channels       = ti_ads7960_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7960_channels),
        },
        [TI_ADS7961] = {
                .channels       = ti_ads7961_channels,
                .num_channels   = ARRAY_SIZE(ti_ads7961_channels),
        },
};

/*
 * ti_ads7950_update_scan_mode() setup the spi transfer buffer for the new
 * scan mask
 */
static int ti_ads7950_update_scan_mode(struct iio_dev *indio_dev,
                                       const unsigned long *active_scan_mask)
{
        struct ti_ads7950_state *st = iio_priv(indio_dev);
        int i, cmd, len;

        len = 0;
        for_each_set_bit(i, active_scan_mask, indio_dev->num_channels) {
                cmd = TI_ADS7950_MAN_CMD(TI_ADS7950_CR_CHAN(i));
                st->tx_buf[len++] = cmd;
        }

        /* Data for the 1st channel is not returned until the 3rd transfer */
        st->tx_buf[len++] = 0;
        st->tx_buf[len++] = 0;

        st->ring_xfer.len = len * 2;

        return 0;
}

static irqreturn_t ti_ads7950_trigger_handler(int irq, void *p)
{
        struct iio_poll_func *pf = p;
        struct iio_dev *indio_dev = pf->indio_dev;
        struct ti_ads7950_state *st = iio_priv(indio_dev);
        int ret;

        mutex_lock(&st->slock);
        ret = spi_sync(st->spi, &st->ring_msg);
        if (ret < 0)
                goto out;

        iio_push_to_buffers_with_timestamp(indio_dev, &st->rx_buf[2],
                                           iio_get_time_ns(indio_dev));

out:
        mutex_unlock(&st->slock);
        iio_trigger_notify_done(indio_dev->trig);

        return IRQ_HANDLED;
}

static int ti_ads7950_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
{
        struct ti_ads7950_state *st = iio_priv(indio_dev);
        int ret, cmd;

        mutex_lock(&st->slock);
        cmd = TI_ADS7950_MAN_CMD(TI_ADS7950_CR_CHAN(ch));
        st->single_tx = cmd;

        ret = spi_sync(st->spi, &st->scan_single_msg);
        if (ret)
                goto out;

        ret = st->single_rx;

out:
        mutex_unlock(&st->slock);

        return ret;
}

static int ti_ads7950_get_range(struct ti_ads7950_state *st)
{
        int vref;

        if (st->vref_mv) {
                vref = st->vref_mv;
        } else {
                vref = regulator_get_voltage(st->reg);
                if (vref < 0)
                        return vref;

                vref /= 1000;
        }

        if (st->cmd_settings_bitmask & TI_ADS7950_CR_RANGE_5V)
                vref *= 2;

        return vref;
}

static int ti_ads7950_read_raw(struct iio_dev *indio_dev,
                               struct iio_chan_spec const *chan,
                               int *val, int *val2, long m)
{
        struct ti_ads7950_state *st = iio_priv(indio_dev);
        int ret;

        switch (m) {
        case IIO_CHAN_INFO_RAW:
                ret = ti_ads7950_scan_direct(indio_dev, chan->address);
                if (ret < 0)
                        return ret;

                if (chan->address != TI_ADS7950_EXTRACT(ret, 12, 4))
                        return -EIO;

                *val = TI_ADS7950_EXTRACT(ret, chan->scan_type.shift,
                                          chan->scan_type.realbits);

                return IIO_VAL_INT;
        case IIO_CHAN_INFO_SCALE:
                ret = ti_ads7950_get_range(st);
                if (ret < 0)
                        return ret;

                *val = ret;
                *val2 = (1 << chan->scan_type.realbits) - 1;

                return IIO_VAL_FRACTIONAL;
        }

        return -EINVAL;
}

static const struct iio_info ti_ads7950_info = {
        .read_raw               = &ti_ads7950_read_raw,
        .update_scan_mode       = ti_ads7950_update_scan_mode,
};

static int ti_ads7950_set(struct gpio_chip *chip, unsigned int offset,
                          int value)
{
        struct ti_ads7950_state *st = gpiochip_get_data(chip);
        int ret;

        mutex_lock(&st->slock);

        if (value)
                st->cmd_settings_bitmask |= BIT(offset);
        else
                st->cmd_settings_bitmask &= ~BIT(offset);

        st->single_tx = TI_ADS7950_MAN_CMD_SETTINGS(st);
        ret = spi_sync(st->spi, &st->scan_single_msg);

        mutex_unlock(&st->slock);

        return ret;
}

static int ti_ads7950_get(struct gpio_chip *chip, unsigned int offset)
{
        struct ti_ads7950_state *st = gpiochip_get_data(chip);
        bool state;
        int ret;

        mutex_lock(&st->slock);

        /* If set as output, return the output */
        if (st->gpio_cmd_settings_bitmask & BIT(offset)) {
                state = st->cmd_settings_bitmask & BIT(offset);
                ret = 0;
                goto out;
        }

        /* GPIO data bit sets SDO bits 12-15 to GPIO input */
        st->cmd_settings_bitmask |= TI_ADS7950_CR_GPIO_DATA;
        st->single_tx = TI_ADS7950_MAN_CMD_SETTINGS(st);
        ret = spi_sync(st->spi, &st->scan_single_msg);
        if (ret)
                goto out;

        state = (st->single_rx >> 12) & BIT(offset);

        /* Revert back to original settings */
        st->cmd_settings_bitmask &= ~TI_ADS7950_CR_GPIO_DATA;
        st->single_tx = TI_ADS7950_MAN_CMD_SETTINGS(st);
        ret = spi_sync(st->spi, &st->scan_single_msg);
        if (ret)
                goto out;

out:
        mutex_unlock(&st->slock);

        return ret ?: state;
}

static int ti_ads7950_get_direction(struct gpio_chip *chip,
                                    unsigned int offset)
{
        struct ti_ads7950_state *st = gpiochip_get_data(chip);

        /* Bitmask is inverted from GPIO framework 0=input/1=output */
        return !(st->gpio_cmd_settings_bitmask & BIT(offset));
}

static int _ti_ads7950_set_direction(struct gpio_chip *chip, int offset,
                                     int input)
{
        struct ti_ads7950_state *st = gpiochip_get_data(chip);
        int ret = 0;

        mutex_lock(&st->slock);

        /* Only change direction if needed */
        if (input && (st->gpio_cmd_settings_bitmask & BIT(offset)))
                st->gpio_cmd_settings_bitmask &= ~BIT(offset);
        else if (!input && !(st->gpio_cmd_settings_bitmask & BIT(offset)))
                st->gpio_cmd_settings_bitmask |= BIT(offset);
        else
                goto out;

        st->single_tx = TI_ADS7950_GPIO_CMD_SETTINGS(st);
        ret = spi_sync(st->spi, &st->scan_single_msg);

out:
        mutex_unlock(&st->slock);

        return ret;
}

static int ti_ads7950_direction_input(struct gpio_chip *chip,
                                      unsigned int offset)
{
        return _ti_ads7950_set_direction(chip, offset, 1);
}

static int ti_ads7950_direction_output(struct gpio_chip *chip,
                                       unsigned int offset, int value)
{
        int ret;

        ret = ti_ads7950_set(chip, offset, value);
        if (ret)
                return ret;

        return _ti_ads7950_set_direction(chip, offset, 0);
}

static int ti_ads7950_init_hw(struct ti_ads7950_state *st)
{
        int ret = 0;

        mutex_lock(&st->slock);

        /* Settings for Manual/Auto1/Auto2 commands */
        /* Default to 5v ref */
        st->cmd_settings_bitmask = TI_ADS7950_CR_RANGE_5V;
        st->single_tx = TI_ADS7950_MAN_CMD_SETTINGS(st);
        ret = spi_sync(st->spi, &st->scan_single_msg);
        if (ret)
                goto out;

        /* Settings for GPIO command */
        st->gpio_cmd_settings_bitmask = 0x0;
        st->single_tx = TI_ADS7950_GPIO_CMD_SETTINGS(st);
        ret = spi_sync(st->spi, &st->scan_single_msg);

out:
        mutex_unlock(&st->slock);

        return ret;
}

static int ti_ads7950_probe(struct spi_device *spi)
{
        struct ti_ads7950_state *st;
        struct iio_dev *indio_dev;
        const struct ti_ads7950_chip_info *info;
        int ret;

        spi->bits_per_word = 16;
        spi->mode |= SPI_CS_WORD;
        ret = spi_setup(spi);
        if (ret < 0) {
                dev_err(&spi->dev, "Error in spi setup\n");
                return ret;
        }

        indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
        if (!indio_dev)
                return -ENOMEM;

        st = iio_priv(indio_dev);

        spi_set_drvdata(spi, indio_dev);

        st->spi = spi;

        info = &ti_ads7950_chip_info[spi_get_device_id(spi)->driver_data];

        indio_dev->name = spi_get_device_id(spi)->name;
        indio_dev->modes = INDIO_DIRECT_MODE;
        indio_dev->channels = info->channels;
        indio_dev->num_channels = info->num_channels;
        indio_dev->info = &ti_ads7950_info;

        /* build spi ring message */
        spi_message_init(&st->ring_msg);

        st->ring_xfer.tx_buf = &st->tx_buf[0];
        st->ring_xfer.rx_buf = &st->rx_buf[0];
        /* len will be set later */

        spi_message_add_tail(&st->ring_xfer, &st->ring_msg);

        /*
         * Setup default message. The sample is read at the end of the first
         * transfer, then it takes one full cycle to convert the sample and one
         * more cycle to send the value. The conversion process is driven by
         * the SPI clock, which is why we have 3 transfers. The middle one is
         * just dummy data sent while the chip is converting the sample that
         * was read at the end of the first transfer.
         */

        st->scan_single_xfer[0].tx_buf = &st->single_tx;
        st->scan_single_xfer[0].len = 2;
        st->scan_single_xfer[0].cs_change = 1;
        st->scan_single_xfer[1].tx_buf = &st->single_tx;
        st->scan_single_xfer[1].len = 2;
        st->scan_single_xfer[1].cs_change = 1;
        st->scan_single_xfer[2].rx_buf = &st->single_rx;
        st->scan_single_xfer[2].len = 2;

        spi_message_init_with_transfers(&st->scan_single_msg,
                                        st->scan_single_xfer, 3);

        /* Use hard coded value for reference voltage in ACPI case */
        if (ACPI_COMPANION(&spi->dev))
                st->vref_mv = TI_ADS7950_VA_MV_ACPI_DEFAULT;

        mutex_init(&st->slock);

        st->reg = devm_regulator_get(&spi->dev, "vref");
        if (IS_ERR(st->reg)) {
                ret = dev_err_probe(&spi->dev, PTR_ERR(st->reg),
                                     "Failed to get regulator \"vref\"\n");
                goto error_destroy_mutex;
        }

        ret = regulator_enable(st->reg);
        if (ret) {
                dev_err(&spi->dev, "Failed to enable regulator \"vref\"\n");
                goto error_destroy_mutex;
        }

        ret = iio_triggered_buffer_setup(indio_dev, NULL,
                                         &ti_ads7950_trigger_handler, NULL);
        if (ret) {
                dev_err(&spi->dev, "Failed to setup triggered buffer\n");
                goto error_disable_reg;
        }

        ret = ti_ads7950_init_hw(st);
        if (ret) {
                dev_err(&spi->dev, "Failed to init adc chip\n");
                goto error_cleanup_ring;
        }

        ret = iio_device_register(indio_dev);
        if (ret) {
                dev_err(&spi->dev, "Failed to register iio device\n");
                goto error_cleanup_ring;
        }

        /* Add GPIO chip */
        st->chip.label = dev_name(&st->spi->dev);
        st->chip.parent = &st->spi->dev;
        st->chip.owner = THIS_MODULE;
        st->chip.can_sleep = true;
        st->chip.base = -1;
        st->chip.ngpio = TI_ADS7950_NUM_GPIOS;
        st->chip.get_direction = ti_ads7950_get_direction;
        st->chip.direction_input = ti_ads7950_direction_input;
        st->chip.direction_output = ti_ads7950_direction_output;
        st->chip.get = ti_ads7950_get;
        st->chip.set = ti_ads7950_set;

        ret = gpiochip_add_data(&st->chip, st);
        if (ret) {
                dev_err(&spi->dev, "Failed to init GPIOs\n");
                goto error_iio_device;
        }

        return 0;

error_iio_device:
        iio_device_unregister(indio_dev);
error_cleanup_ring:
        iio_triggered_buffer_cleanup(indio_dev);
error_disable_reg:
        regulator_disable(st->reg);
error_destroy_mutex:
        mutex_destroy(&st->slock);

        return ret;
}

static void ti_ads7950_remove(struct spi_device *spi)
{
        struct iio_dev *indio_dev = spi_get_drvdata(spi);
        struct ti_ads7950_state *st = iio_priv(indio_dev);

        gpiochip_remove(&st->chip);
        iio_device_unregister(indio_dev);
        iio_triggered_buffer_cleanup(indio_dev);
        regulator_disable(st->reg);
        mutex_destroy(&st->slock);
}

static const struct spi_device_id ti_ads7950_id[] = {
        { "ads7950", TI_ADS7950 },
        { "ads7951", TI_ADS7951 },
        { "ads7952", TI_ADS7952 },
        { "ads7953", TI_ADS7953 },
        { "ads7954", TI_ADS7954 },
        { "ads7955", TI_ADS7955 },
        { "ads7956", TI_ADS7956 },
        { "ads7957", TI_ADS7957 },
        { "ads7958", TI_ADS7958 },
        { "ads7959", TI_ADS7959 },
        { "ads7960", TI_ADS7960 },
        { "ads7961", TI_ADS7961 },
        { }
};
MODULE_DEVICE_TABLE(spi, ti_ads7950_id);

static const struct of_device_id ads7950_of_table[] = {
        { .compatible = "ti,ads7950", .data = &ti_ads7950_chip_info[TI_ADS7950] },
        { .compatible = "ti,ads7951", .data = &ti_ads7950_chip_info[TI_ADS7951] },
        { .compatible = "ti,ads7952", .data = &ti_ads7950_chip_info[TI_ADS7952] },
        { .compatible = "ti,ads7953", .data = &ti_ads7950_chip_info[TI_ADS7953] },
        { .compatible = "ti,ads7954", .data = &ti_ads7950_chip_info[TI_ADS7954] },
        { .compatible = "ti,ads7955", .data = &ti_ads7950_chip_info[TI_ADS7955] },
        { .compatible = "ti,ads7956", .data = &ti_ads7950_chip_info[TI_ADS7956] },
        { .compatible = "ti,ads7957", .data = &ti_ads7950_chip_info[TI_ADS7957] },
        { .compatible = "ti,ads7958", .data = &ti_ads7950_chip_info[TI_ADS7958] },
        { .compatible = "ti,ads7959", .data = &ti_ads7950_chip_info[TI_ADS7959] },
        { .compatible = "ti,ads7960", .data = &ti_ads7950_chip_info[TI_ADS7960] },
        { .compatible = "ti,ads7961", .data = &ti_ads7950_chip_info[TI_ADS7961] },
        { }
};
MODULE_DEVICE_TABLE(of, ads7950_of_table);

static struct spi_driver ti_ads7950_driver = {
        .driver = {
                .name   = "ads7950",
                .of_match_table = ads7950_of_table,
        },
        .probe          = ti_ads7950_probe,
        .remove         = ti_ads7950_remove,
        .id_table       = ti_ads7950_id,
};
module_spi_driver(ti_ads7950_driver);

MODULE_AUTHOR("David Lechner <david@lechnology.com>");
MODULE_DESCRIPTION("TI TI_ADS7950 ADC");
MODULE_LICENSE("GPL v2");