// SPDX-License-Identifier: GPL-2.0-only
/*
 * vcnl4000.c - Support for Vishay VCNL4000/4010/4020/4040/4200 combined ambient
 * light and proximity sensor
 *
 * Copyright 2012 Peter Meerwald <pmeerw@pmeerw.net>
 * Copyright 2019 Pursim SPC
 * Copyright 2020 Mathieu Othacehe <m.othacehe@gmail.com>
 *
 * IIO driver for:
 *   VCNL4000/10/20 (7-bit I2C slave address 0x13)
 *   VCNL4040 (7-bit I2C slave address 0x60)
 *   VCNL4200 (7-bit I2C slave address 0x51)
 *
 * TODO:
 *   allow to adjust IR current
 *   interrupts (VCNL4040, VCNL4200)
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/pm_runtime.h>
#include <linux/interrupt.h>

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

#define VCNL4000_DRV_NAME "vcnl4000"
#define VCNL4000_PROD_ID        0x01
#define VCNL4010_PROD_ID        0x02 /* for VCNL4020, VCNL4010 */
#define VCNL4040_PROD_ID        0x86
#define VCNL4200_PROD_ID        0x58

#define VCNL4000_COMMAND        0x80 /* Command register */
#define VCNL4000_PROD_REV       0x81 /* Product ID and Revision ID */
#define VCNL4010_PROX_RATE      0x82 /* Proximity rate */
#define VCNL4000_LED_CURRENT    0x83 /* IR LED current for proximity mode */
#define VCNL4000_AL_PARAM       0x84 /* Ambient light parameter register */
#define VCNL4010_ALS_PARAM      0x84 /* ALS rate */
#define VCNL4000_AL_RESULT_HI   0x85 /* Ambient light result register, MSB */
#define VCNL4000_AL_RESULT_LO   0x86 /* Ambient light result register, LSB */
#define VCNL4000_PS_RESULT_HI   0x87 /* Proximity result register, MSB */
#define VCNL4000_PS_RESULT_LO   0x88 /* Proximity result register, LSB */
#define VCNL4000_PS_MEAS_FREQ   0x89 /* Proximity test signal frequency */
#define VCNL4010_INT_CTRL       0x89 /* Interrupt control */
#define VCNL4000_PS_MOD_ADJ     0x8a /* Proximity modulator timing adjustment */
#define VCNL4010_LOW_THR_HI     0x8a /* Low threshold, MSB */
#define VCNL4010_LOW_THR_LO     0x8b /* Low threshold, LSB */
#define VCNL4010_HIGH_THR_HI    0x8c /* High threshold, MSB */
#define VCNL4010_HIGH_THR_LO    0x8d /* High threshold, LSB */
#define VCNL4010_ISR            0x8e /* Interrupt status */

#define VCNL4200_AL_CONF        0x00 /* Ambient light configuration */
#define VCNL4200_PS_CONF1       0x03 /* Proximity configuration */
#define VCNL4200_PS_DATA        0x08 /* Proximity data */
#define VCNL4200_AL_DATA        0x09 /* Ambient light data */
#define VCNL4200_DEV_ID         0x0e /* Device ID, slave address and version */

#define VCNL4040_DEV_ID         0x0c /* Device ID and version */

/* Bit masks for COMMAND register */
#define VCNL4000_AL_RDY         BIT(6) /* ALS data ready? */
#define VCNL4000_PS_RDY         BIT(5) /* proximity data ready? */
#define VCNL4000_AL_OD          BIT(4) /* start on-demand ALS measurement */
#define VCNL4000_PS_OD          BIT(3) /* start on-demand proximity measurement */
#define VCNL4000_ALS_EN         BIT(2) /* start ALS measurement */
#define VCNL4000_PROX_EN        BIT(1) /* start proximity measurement */
#define VCNL4000_SELF_TIMED_EN  BIT(0) /* start self-timed measurement */

/* Bit masks for interrupt registers. */
#define VCNL4010_INT_THR_SEL    BIT(0) /* Select threshold interrupt source */
#define VCNL4010_INT_THR_EN     BIT(1) /* Threshold interrupt type */
#define VCNL4010_INT_ALS_EN     BIT(2) /* Enable on ALS data ready */
#define VCNL4010_INT_PROX_EN    BIT(3) /* Enable on proximity data ready */

#define VCNL4010_INT_THR_HIGH   0 /* High threshold exceeded */
#define VCNL4010_INT_THR_LOW    1 /* Low threshold exceeded */
#define VCNL4010_INT_ALS        2 /* ALS data ready */
#define VCNL4010_INT_PROXIMITY  3 /* Proximity data ready */

#define VCNL4010_INT_THR \
        (BIT(VCNL4010_INT_THR_LOW) | BIT(VCNL4010_INT_THR_HIGH))
#define VCNL4010_INT_DRDY \
        (BIT(VCNL4010_INT_PROXIMITY) | BIT(VCNL4010_INT_ALS))

static const int vcnl4010_prox_sampling_frequency[][2] = {
        {1, 950000},
        {3, 906250},
        {7, 812500},
        {16, 625000},
        {31, 250000},
        {62, 500000},
        {125, 0},
        {250, 0},
};

#define VCNL4000_SLEEP_DELAY_MS 2000 /* before we enter pm_runtime_suspend */

enum vcnl4000_device_ids {
        VCNL4000,
        VCNL4010,
        VCNL4040,
        VCNL4200,
};

struct vcnl4200_channel {
        u8 reg;
        ktime_t last_measurement;
        ktime_t sampling_rate;
        struct mutex lock;
};

struct vcnl4000_data {
        struct i2c_client *client;
        enum vcnl4000_device_ids id;
        int rev;
        int al_scale;
        const struct vcnl4000_chip_spec *chip_spec;
        struct mutex vcnl4000_lock;
        struct vcnl4200_channel vcnl4200_al;
        struct vcnl4200_channel vcnl4200_ps;
        uint32_t near_level;
};

struct vcnl4000_chip_spec {
        const char *prod;
        struct iio_chan_spec const *channels;
        const int num_channels;
        const struct iio_info *info;
        bool irq_support;
        int (*init)(struct vcnl4000_data *data);
        int (*measure_light)(struct vcnl4000_data *data, int *val);
        int (*measure_proximity)(struct vcnl4000_data *data, int *val);
        int (*set_power_state)(struct vcnl4000_data *data, bool on);
};

static const struct i2c_device_id vcnl4000_id[] = {
        { "vcnl4000", VCNL4000 },
        { "vcnl4010", VCNL4010 },
        { "vcnl4020", VCNL4010 },
        { "vcnl4040", VCNL4040 },
        { "vcnl4200", VCNL4200 },
        { }
};
MODULE_DEVICE_TABLE(i2c, vcnl4000_id);

static int vcnl4000_set_power_state(struct vcnl4000_data *data, bool on)
{
        /* no suspend op */
        return 0;
}

static int vcnl4000_init(struct vcnl4000_data *data)
{
        int ret, prod_id;

        ret = i2c_smbus_read_byte_data(data->client, VCNL4000_PROD_REV);
        if (ret < 0)
                return ret;

        prod_id = ret >> 4;
        switch (prod_id) {
        case VCNL4000_PROD_ID:
                if (data->id != VCNL4000)
                        dev_warn(&data->client->dev,
                                        "wrong device id, use vcnl4000");
                break;
        case VCNL4010_PROD_ID:
                if (data->id != VCNL4010)
                        dev_warn(&data->client->dev,
                                        "wrong device id, use vcnl4010/4020");
                break;
        default:
                return -ENODEV;
        }

        data->rev = ret & 0xf;
        data->al_scale = 250000;
        mutex_init(&data->vcnl4000_lock);

        return data->chip_spec->set_power_state(data, true);
};

static int vcnl4200_set_power_state(struct vcnl4000_data *data, bool on)
{
        u16 val = on ? 0 /* power on */ : 1 /* shut down */;
        int ret;

        ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF, val);
        if (ret < 0)
                return ret;

        ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1, val);
        if (ret < 0)
                return ret;

        if (on) {
                /* Wait at least one integration cycle before fetching data */
                data->vcnl4200_al.last_measurement = ktime_get();
                data->vcnl4200_ps.last_measurement = ktime_get();
        }

        return 0;
}

static int vcnl4200_init(struct vcnl4000_data *data)
{
        int ret, id;

        ret = i2c_smbus_read_word_data(data->client, VCNL4200_DEV_ID);
        if (ret < 0)
                return ret;

        id = ret & 0xff;

        if (id != VCNL4200_PROD_ID) {
                ret = i2c_smbus_read_word_data(data->client, VCNL4040_DEV_ID);
                if (ret < 0)
                        return ret;

                id = ret & 0xff;

                if (id != VCNL4040_PROD_ID)
                        return -ENODEV;
        }

        dev_dbg(&data->client->dev, "device id 0x%x", id);

        data->rev = (ret >> 8) & 0xf;

        data->vcnl4200_al.reg = VCNL4200_AL_DATA;
        data->vcnl4200_ps.reg = VCNL4200_PS_DATA;
        switch (id) {
        case VCNL4200_PROD_ID:
                /* Default wait time is 50ms, add 20% tolerance. */
                data->vcnl4200_al.sampling_rate = ktime_set(0, 60000 * 1000);
                /* Default wait time is 4.8ms, add 20% tolerance. */
                data->vcnl4200_ps.sampling_rate = ktime_set(0, 5760 * 1000);
                data->al_scale = 24000;
                break;
        case VCNL4040_PROD_ID:
                /* Default wait time is 80ms, add 20% tolerance. */
                data->vcnl4200_al.sampling_rate = ktime_set(0, 96000 * 1000);
                /* Default wait time is 5ms, add 20% tolerance. */
                data->vcnl4200_ps.sampling_rate = ktime_set(0, 6000 * 1000);
                data->al_scale = 120000;
                break;
        }
        mutex_init(&data->vcnl4200_al.lock);
        mutex_init(&data->vcnl4200_ps.lock);

        ret = data->chip_spec->set_power_state(data, true);
        if (ret < 0)
                return ret;

        return 0;
};

static int vcnl4000_read_data(struct vcnl4000_data *data, u8 data_reg, int *val)
{
        s32 ret;

        ret = i2c_smbus_read_word_swapped(data->client, data_reg);
        if (ret < 0)
                return ret;

        *val = ret;
        return 0;
}

static int vcnl4000_write_data(struct vcnl4000_data *data, u8 data_reg, int val)
{
        if (val > U16_MAX)
                return -ERANGE;

        return i2c_smbus_write_word_swapped(data->client, data_reg, val);
}


static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
                                u8 rdy_mask, u8 data_reg, int *val)
{
        int tries = 20;
        int ret;

        mutex_lock(&data->vcnl4000_lock);

        ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND,
                                        req_mask);
        if (ret < 0)
                goto fail;

        /* wait for data to become ready */
        while (tries--) {
                ret = i2c_smbus_read_byte_data(data->client, VCNL4000_COMMAND);
                if (ret < 0)
                        goto fail;
                if (ret & rdy_mask)
                        break;
                msleep(20); /* measurement takes up to 100 ms */
        }

        if (tries < 0) {
                dev_err(&data->client->dev,
                        "vcnl4000_measure() failed, data not ready\n");
                ret = -EIO;
                goto fail;
        }

        ret = vcnl4000_read_data(data, data_reg, val);
        if (ret < 0)
                goto fail;

        mutex_unlock(&data->vcnl4000_lock);

        return 0;

fail:
        mutex_unlock(&data->vcnl4000_lock);
        return ret;
}

static int vcnl4200_measure(struct vcnl4000_data *data,
                struct vcnl4200_channel *chan, int *val)
{
        int ret;
        s64 delta;
        ktime_t next_measurement;

        mutex_lock(&chan->lock);

        next_measurement = ktime_add(chan->last_measurement,
                        chan->sampling_rate);
        delta = ktime_us_delta(next_measurement, ktime_get());
        if (delta > 0)
                usleep_range(delta, delta + 500);
        chan->last_measurement = ktime_get();

        mutex_unlock(&chan->lock);

        ret = i2c_smbus_read_word_data(data->client, chan->reg);
        if (ret < 0)
                return ret;

        *val = ret;

        return 0;
}

static int vcnl4000_measure_light(struct vcnl4000_data *data, int *val)
{
        return vcnl4000_measure(data,
                        VCNL4000_AL_OD, VCNL4000_AL_RDY,
                        VCNL4000_AL_RESULT_HI, val);
}

static int vcnl4200_measure_light(struct vcnl4000_data *data, int *val)
{
        return vcnl4200_measure(data, &data->vcnl4200_al, val);
}

static int vcnl4000_measure_proximity(struct vcnl4000_data *data, int *val)
{
        return vcnl4000_measure(data,
                        VCNL4000_PS_OD, VCNL4000_PS_RDY,
                        VCNL4000_PS_RESULT_HI, val);
}

static int vcnl4200_measure_proximity(struct vcnl4000_data *data, int *val)
{
        return vcnl4200_measure(data, &data->vcnl4200_ps, val);
}

static int vcnl4010_read_proxy_samp_freq(struct vcnl4000_data *data, int *val,
                                         int *val2)
{
        int ret;

        ret = i2c_smbus_read_byte_data(data->client, VCNL4010_PROX_RATE);
        if (ret < 0)
                return ret;

        if (ret >= ARRAY_SIZE(vcnl4010_prox_sampling_frequency))
                return -EINVAL;

        *val = vcnl4010_prox_sampling_frequency[ret][0];
        *val2 = vcnl4010_prox_sampling_frequency[ret][1];

        return 0;
}

static bool vcnl4010_is_in_periodic_mode(struct vcnl4000_data *data)
{
        int ret;

        ret = i2c_smbus_read_byte_data(data->client, VCNL4000_COMMAND);
        if (ret < 0)
                return false;

        return !!(ret & VCNL4000_SELF_TIMED_EN);
}

static int vcnl4000_set_pm_runtime_state(struct vcnl4000_data *data, bool on)
{
        struct device *dev = &data->client->dev;
        int ret;

        if (on) {
                ret = pm_runtime_resume_and_get(dev);
        } else {
                pm_runtime_mark_last_busy(dev);
                ret = pm_runtime_put_autosuspend(dev);
        }

        return ret;
}

static int vcnl4000_read_raw(struct iio_dev *indio_dev,
                                struct iio_chan_spec const *chan,
                                int *val, int *val2, long mask)
{
        int ret;
        struct vcnl4000_data *data = iio_priv(indio_dev);

        switch (mask) {
        case IIO_CHAN_INFO_RAW:
                ret = vcnl4000_set_pm_runtime_state(data, true);
                if  (ret < 0)
                        return ret;

                switch (chan->type) {
                case IIO_LIGHT:
                        ret = data->chip_spec->measure_light(data, val);
                        if (!ret)
                                ret = IIO_VAL_INT;
                        break;
                case IIO_PROXIMITY:
                        ret = data->chip_spec->measure_proximity(data, val);
                        if (!ret)
                                ret = IIO_VAL_INT;
                        break;
                default:
                        ret = -EINVAL;
                }
                vcnl4000_set_pm_runtime_state(data, false);
                return ret;
        case IIO_CHAN_INFO_SCALE:
                if (chan->type != IIO_LIGHT)
                        return -EINVAL;

                *val = 0;
                *val2 = data->al_scale;
                return IIO_VAL_INT_PLUS_MICRO;
        default:
                return -EINVAL;
        }
}

static int vcnl4010_read_raw(struct iio_dev *indio_dev,
                             struct iio_chan_spec const *chan,
                             int *val, int *val2, long mask)
{
        int ret;
        struct vcnl4000_data *data = iio_priv(indio_dev);

        switch (mask) {
        case IIO_CHAN_INFO_RAW:
        case IIO_CHAN_INFO_SCALE:
                ret = iio_device_claim_direct_mode(indio_dev);
                if (ret)
                        return ret;

                /* Protect against event capture. */
                if (vcnl4010_is_in_periodic_mode(data)) {
                        ret = -EBUSY;
                } else {
                        ret = vcnl4000_read_raw(indio_dev, chan, val, val2,
                                                mask);
                }

                iio_device_release_direct_mode(indio_dev);
                return ret;
        case IIO_CHAN_INFO_SAMP_FREQ:
                switch (chan->type) {
                case IIO_PROXIMITY:
                        ret = vcnl4010_read_proxy_samp_freq(data, val, val2);
                        if (ret < 0)
                                return ret;
                        return IIO_VAL_INT_PLUS_MICRO;
                default:
                        return -EINVAL;
                }
        default:
                return -EINVAL;
        }
}

static int vcnl4010_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 = (int *)vcnl4010_prox_sampling_frequency;
                *type = IIO_VAL_INT_PLUS_MICRO;
                *length = 2 * ARRAY_SIZE(vcnl4010_prox_sampling_frequency);
                return IIO_AVAIL_LIST;
        default:
                return -EINVAL;
        }
}

static int vcnl4010_write_proxy_samp_freq(struct vcnl4000_data *data, int val,
                                          int val2)
{
        unsigned int i;
        int index = -1;

        for (i = 0; i < ARRAY_SIZE(vcnl4010_prox_sampling_frequency); i++) {
                if (val == vcnl4010_prox_sampling_frequency[i][0] &&
                    val2 == vcnl4010_prox_sampling_frequency[i][1]) {
                        index = i;
                        break;
                }
        }

        if (index < 0)
                return -EINVAL;

        return i2c_smbus_write_byte_data(data->client, VCNL4010_PROX_RATE,
                                         index);
}

static int vcnl4010_write_raw(struct iio_dev *indio_dev,
                              struct iio_chan_spec const *chan,
                              int val, int val2, long mask)
{
        int ret;
        struct vcnl4000_data *data = iio_priv(indio_dev);

        ret = iio_device_claim_direct_mode(indio_dev);
        if (ret)
                return ret;

        /* Protect against event capture. */
        if (vcnl4010_is_in_periodic_mode(data)) {
                ret = -EBUSY;
                goto end;
        }

        switch (mask) {
        case IIO_CHAN_INFO_SAMP_FREQ:
                switch (chan->type) {
                case IIO_PROXIMITY:
                        ret = vcnl4010_write_proxy_samp_freq(data, val, val2);
                        goto end;
                default:
                        ret = -EINVAL;
                        goto end;
                }
        default:
                ret = -EINVAL;
                goto end;
        }

end:
        iio_device_release_direct_mode(indio_dev);
        return ret;
}

static int vcnl4010_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)
{
        int ret;
        struct vcnl4000_data *data = iio_priv(indio_dev);

        switch (info) {
        case IIO_EV_INFO_VALUE:
                switch (dir) {
                case IIO_EV_DIR_RISING:
                        ret = vcnl4000_read_data(data, VCNL4010_HIGH_THR_HI,
                                                 val);
                        if (ret < 0)
                                return ret;
                        return IIO_VAL_INT;
                case IIO_EV_DIR_FALLING:
                        ret = vcnl4000_read_data(data, VCNL4010_LOW_THR_HI,
                                                 val);
                        if (ret < 0)
                                return ret;
                        return IIO_VAL_INT;
                default:
                        return -EINVAL;
                }
        default:
                return -EINVAL;
        }
}

static int vcnl4010_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)
{
        int ret;
        struct vcnl4000_data *data = iio_priv(indio_dev);

        switch (info) {
        case IIO_EV_INFO_VALUE:
                switch (dir) {
                case IIO_EV_DIR_RISING:
                        ret = vcnl4000_write_data(data, VCNL4010_HIGH_THR_HI,
                                                  val);
                        if (ret < 0)
                                return ret;
                        return IIO_VAL_INT;
                case IIO_EV_DIR_FALLING:
                        ret = vcnl4000_write_data(data, VCNL4010_LOW_THR_HI,
                                                  val);
                        if (ret < 0)
                                return ret;
                        return IIO_VAL_INT;
                default:
                        return -EINVAL;
                }
        default:
                return -EINVAL;
        }
}

static bool vcnl4010_is_thr_enabled(struct vcnl4000_data *data)
{
        int ret;

        ret = i2c_smbus_read_byte_data(data->client, VCNL4010_INT_CTRL);
        if (ret < 0)
                return false;

        return !!(ret & VCNL4010_INT_THR_EN);
}

static int vcnl4010_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 vcnl4000_data *data = iio_priv(indio_dev);

        switch (chan->type) {
        case IIO_PROXIMITY:
                return vcnl4010_is_thr_enabled(data);
        default:
                return -EINVAL;
        }
}

static int vcnl4010_config_threshold(struct iio_dev *indio_dev, bool state)
{
        struct vcnl4000_data *data = iio_priv(indio_dev);
        int ret;
        int icr;
        int command;

        if (state) {
                ret = iio_device_claim_direct_mode(indio_dev);
                if (ret)
                        return ret;

                /* Enable periodic measurement of proximity data. */
                command = VCNL4000_SELF_TIMED_EN | VCNL4000_PROX_EN;

                /*
                 * Enable interrupts on threshold, for proximity data by
                 * default.
                 */
                icr = VCNL4010_INT_THR_EN;
        } else {
                if (!vcnl4010_is_thr_enabled(data))
                        return 0;

                command = 0;
                icr = 0;
        }

        ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND,
                                        command);
        if (ret < 0)
                goto end;

        ret = i2c_smbus_write_byte_data(data->client, VCNL4010_INT_CTRL, icr);

end:
        if (state)
                iio_device_release_direct_mode(indio_dev);

        return ret;
}

static int vcnl4010_write_event_config(struct iio_dev *indio_dev,
                                       const struct iio_chan_spec *chan,
                                       enum iio_event_type type,
                                       enum iio_event_direction dir,
                                       int state)
{
        switch (chan->type) {
        case IIO_PROXIMITY:
                return vcnl4010_config_threshold(indio_dev, state);
        default:
                return -EINVAL;
        }
}

static ssize_t vcnl4000_read_near_level(struct iio_dev *indio_dev,
                                        uintptr_t priv,
                                        const struct iio_chan_spec *chan,
                                        char *buf)
{
        struct vcnl4000_data *data = iio_priv(indio_dev);

        return sprintf(buf, "%u\n", data->near_level);
}

static const struct iio_chan_spec_ext_info vcnl4000_ext_info[] = {
        {
                .name = "nearlevel",
                .shared = IIO_SEPARATE,
                .read = vcnl4000_read_near_level,
        },
        { /* sentinel */ }
};

static const struct iio_event_spec vcnl4000_event_spec[] = {
        {
                .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_ENABLE),
        }
};

static const struct iio_chan_spec vcnl4000_channels[] = {
        {
                .type = IIO_LIGHT,
                .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
                        BIT(IIO_CHAN_INFO_SCALE),
        }, {
                .type = IIO_PROXIMITY,
                .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
                .ext_info = vcnl4000_ext_info,
        }
};

static const struct iio_chan_spec vcnl4010_channels[] = {
        {
                .type = IIO_LIGHT,
                .scan_index = -1,
                .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
                        BIT(IIO_CHAN_INFO_SCALE),
        }, {
                .type = IIO_PROXIMITY,
                .scan_index = 0,
                .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
                        BIT(IIO_CHAN_INFO_SAMP_FREQ),
                .info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
                .event_spec = vcnl4000_event_spec,
                .num_event_specs = ARRAY_SIZE(vcnl4000_event_spec),
                .ext_info = vcnl4000_ext_info,
                .scan_type = {
                        .sign = 'u',
                        .realbits = 16,
                        .storagebits = 16,
                        .endianness = IIO_CPU,
                },
        },
        IIO_CHAN_SOFT_TIMESTAMP(1),
};

static const struct iio_info vcnl4000_info = {
        .read_raw = vcnl4000_read_raw,
};

static const struct iio_info vcnl4010_info = {
        .read_raw = vcnl4010_read_raw,
        .read_avail = vcnl4010_read_avail,
        .write_raw = vcnl4010_write_raw,
        .read_event_value = vcnl4010_read_event,
        .write_event_value = vcnl4010_write_event,
        .read_event_config = vcnl4010_read_event_config,
        .write_event_config = vcnl4010_write_event_config,
};

static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
        [VCNL4000] = {
                .prod = "VCNL4000",
                .init = vcnl4000_init,
                .measure_light = vcnl4000_measure_light,
                .measure_proximity = vcnl4000_measure_proximity,
                .set_power_state = vcnl4000_set_power_state,
                .channels = vcnl4000_channels,
                .num_channels = ARRAY_SIZE(vcnl4000_channels),
                .info = &vcnl4000_info,
                .irq_support = false,
        },
        [VCNL4010] = {
                .prod = "VCNL4010/4020",
                .init = vcnl4000_init,
                .measure_light = vcnl4000_measure_light,
                .measure_proximity = vcnl4000_measure_proximity,
                .set_power_state = vcnl4000_set_power_state,
                .channels = vcnl4010_channels,
                .num_channels = ARRAY_SIZE(vcnl4010_channels),
                .info = &vcnl4010_info,
                .irq_support = true,
        },
        [VCNL4040] = {
                .prod = "VCNL4040",
                .init = vcnl4200_init,
                .measure_light = vcnl4200_measure_light,
                .measure_proximity = vcnl4200_measure_proximity,
                .set_power_state = vcnl4200_set_power_state,
                .channels = vcnl4000_channels,
                .num_channels = ARRAY_SIZE(vcnl4000_channels),
                .info = &vcnl4000_info,
                .irq_support = false,
        },
        [VCNL4200] = {
                .prod = "VCNL4200",
                .init = vcnl4200_init,
                .measure_light = vcnl4200_measure_light,
                .measure_proximity = vcnl4200_measure_proximity,
                .set_power_state = vcnl4200_set_power_state,
                .channels = vcnl4000_channels,
                .num_channels = ARRAY_SIZE(vcnl4000_channels),
                .info = &vcnl4000_info,
                .irq_support = false,
        },
};

static irqreturn_t vcnl4010_irq_thread(int irq, void *p)
{
        struct iio_dev *indio_dev = p;
        struct vcnl4000_data *data = iio_priv(indio_dev);
        unsigned long isr;
        int ret;

        ret = i2c_smbus_read_byte_data(data->client, VCNL4010_ISR);
        if (ret < 0)
                goto end;

        isr = ret;

        if (isr & VCNL4010_INT_THR) {
                if (test_bit(VCNL4010_INT_THR_LOW, &isr)) {
                        iio_push_event(indio_dev,
                                       IIO_UNMOD_EVENT_CODE(
                                               IIO_PROXIMITY,
                                               1,
                                               IIO_EV_TYPE_THRESH,
                                               IIO_EV_DIR_FALLING),
                                       iio_get_time_ns(indio_dev));
                }

                if (test_bit(VCNL4010_INT_THR_HIGH, &isr)) {
                        iio_push_event(indio_dev,
                                       IIO_UNMOD_EVENT_CODE(
                                               IIO_PROXIMITY,
                                               1,
                                               IIO_EV_TYPE_THRESH,
                                               IIO_EV_DIR_RISING),
                                       iio_get_time_ns(indio_dev));
                }

                i2c_smbus_write_byte_data(data->client, VCNL4010_ISR,
                                          isr & VCNL4010_INT_THR);
        }

        if (isr & VCNL4010_INT_DRDY && iio_buffer_enabled(indio_dev))
                iio_trigger_poll_chained(indio_dev->trig);

end:
        return IRQ_HANDLED;
}

static irqreturn_t vcnl4010_trigger_handler(int irq, void *p)
{
        struct iio_poll_func *pf = p;
        struct iio_dev *indio_dev = pf->indio_dev;
        struct vcnl4000_data *data = iio_priv(indio_dev);
        const unsigned long *active_scan_mask = indio_dev->active_scan_mask;
        u16 buffer[8] __aligned(8) = {0}; /* 1x16-bit + naturally aligned ts */
        bool data_read = false;
        unsigned long isr;
        int val = 0;
        int ret;

        ret = i2c_smbus_read_byte_data(data->client, VCNL4010_ISR);
        if (ret < 0)
                goto end;

        isr = ret;

        if (test_bit(0, active_scan_mask)) {
                if (test_bit(VCNL4010_INT_PROXIMITY, &isr)) {
                        ret = vcnl4000_read_data(data,
                                                 VCNL4000_PS_RESULT_HI,
                                                 &val);
                        if (ret < 0)
                                goto end;

                        buffer[0] = val;
                        data_read = true;
                }
        }

        ret = i2c_smbus_write_byte_data(data->client, VCNL4010_ISR,
                                        isr & VCNL4010_INT_DRDY);
        if (ret < 0)
                goto end;

        if (!data_read)
                goto end;

        iio_push_to_buffers_with_timestamp(indio_dev, buffer,
                                           iio_get_time_ns(indio_dev));

end:
        iio_trigger_notify_done(indio_dev->trig);
        return IRQ_HANDLED;
}

static int vcnl4010_buffer_postenable(struct iio_dev *indio_dev)
{
        struct vcnl4000_data *data = iio_priv(indio_dev);
        int ret;
        int cmd;

        /* Do not enable the buffer if we are already capturing events. */
        if (vcnl4010_is_in_periodic_mode(data))
                return -EBUSY;

        ret = i2c_smbus_write_byte_data(data->client, VCNL4010_INT_CTRL,
                                        VCNL4010_INT_PROX_EN);
        if (ret < 0)
                return ret;

        cmd = VCNL4000_SELF_TIMED_EN | VCNL4000_PROX_EN;
        return i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND, cmd);
}

static int vcnl4010_buffer_predisable(struct iio_dev *indio_dev)
{
        struct vcnl4000_data *data = iio_priv(indio_dev);
        int ret;

        ret = i2c_smbus_write_byte_data(data->client, VCNL4010_INT_CTRL, 0);
        if (ret < 0)
                return ret;

        return i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND, 0);
}

static const struct iio_buffer_setup_ops vcnl4010_buffer_ops = {
        .postenable = &vcnl4010_buffer_postenable,
        .predisable = &vcnl4010_buffer_predisable,
};

static const struct iio_trigger_ops vcnl4010_trigger_ops = {
        .validate_device = iio_trigger_validate_own_device,
};

static int vcnl4010_probe_trigger(struct iio_dev *indio_dev)
{
        struct vcnl4000_data *data = iio_priv(indio_dev);
        struct i2c_client *client = data->client;
        struct iio_trigger *trigger;

        trigger = devm_iio_trigger_alloc(&client->dev, "%s-dev%d",
                                         indio_dev->name,
                                         iio_device_id(indio_dev));

        if (!trigger)
                return -ENOMEM;

        trigger->ops = &vcnl4010_trigger_ops;
        iio_trigger_set_drvdata(trigger, indio_dev);

        return devm_iio_trigger_register(&client->dev, trigger);
}

static int vcnl4000_probe(struct i2c_client *client,
                          const struct i2c_device_id *id)
{
        struct vcnl4000_data *data;
        struct iio_dev *indio_dev;
        int ret;

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

        data = iio_priv(indio_dev);
        i2c_set_clientdata(client, indio_dev);
        data->client = client;
        data->id = id->driver_data;
        data->chip_spec = &vcnl4000_chip_spec_cfg[data->id];

        ret = data->chip_spec->init(data);
        if (ret < 0)
                return ret;

        dev_dbg(&client->dev, "%s Ambient light/proximity sensor, Rev: %02x\n",
                data->chip_spec->prod, data->rev);

        if (device_property_read_u32(&client->dev, "proximity-near-level",
                                     &data->near_level))
                data->near_level = 0;

        indio_dev->info = data->chip_spec->info;
        indio_dev->channels = data->chip_spec->channels;
        indio_dev->num_channels = data->chip_spec->num_channels;
        indio_dev->name = VCNL4000_DRV_NAME;
        indio_dev->modes = INDIO_DIRECT_MODE;

        if (client->irq && data->chip_spec->irq_support) {
                ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
                                                      NULL,
                                                      vcnl4010_trigger_handler,
                                                      &vcnl4010_buffer_ops);
                if (ret < 0) {
                        dev_err(&client->dev,
                                "unable to setup iio triggered buffer\n");
                        return ret;
                }

                ret = devm_request_threaded_irq(&client->dev, client->irq,
                                                NULL, vcnl4010_irq_thread,
                                                IRQF_TRIGGER_FALLING |
                                                IRQF_ONESHOT,
                                                "vcnl4010_irq",
                                                indio_dev);
                if (ret < 0) {
                        dev_err(&client->dev, "irq request failed\n");
                        return ret;
                }

                ret = vcnl4010_probe_trigger(indio_dev);
                if (ret < 0)
                        return ret;
        }

        ret = pm_runtime_set_active(&client->dev);
        if (ret < 0)
                goto fail_poweroff;

        ret = iio_device_register(indio_dev);
        if (ret < 0)
                goto fail_poweroff;

        pm_runtime_enable(&client->dev);
        pm_runtime_set_autosuspend_delay(&client->dev, VCNL4000_SLEEP_DELAY_MS);
        pm_runtime_use_autosuspend(&client->dev);

        return 0;
fail_poweroff:
        data->chip_spec->set_power_state(data, false);
        return ret;
}

static const struct of_device_id vcnl_4000_of_match[] = {
        {
                .compatible = "vishay,vcnl4000",
                .data = (void *)VCNL4000,
        },
        {
                .compatible = "vishay,vcnl4010",
                .data = (void *)VCNL4010,
        },
        {
                .compatible = "vishay,vcnl4020",
                .data = (void *)VCNL4010,
        },
        {
                .compatible = "vishay,vcnl4040",
                .data = (void *)VCNL4040,
        },
        {
                .compatible = "vishay,vcnl4200",
                .data = (void *)VCNL4200,
        },
        {},
};
MODULE_DEVICE_TABLE(of, vcnl_4000_of_match);

static int vcnl4000_remove(struct i2c_client *client)
{
        struct iio_dev *indio_dev = i2c_get_clientdata(client);
        struct vcnl4000_data *data = iio_priv(indio_dev);

        pm_runtime_dont_use_autosuspend(&client->dev);
        pm_runtime_disable(&client->dev);
        iio_device_unregister(indio_dev);
        pm_runtime_set_suspended(&client->dev);

        return data->chip_spec->set_power_state(data, false);
}

static int __maybe_unused vcnl4000_runtime_suspend(struct device *dev)
{
        struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
        struct vcnl4000_data *data = iio_priv(indio_dev);

        return data->chip_spec->set_power_state(data, false);
}

static int __maybe_unused vcnl4000_runtime_resume(struct device *dev)
{
        struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
        struct vcnl4000_data *data = iio_priv(indio_dev);

        return data->chip_spec->set_power_state(data, true);
}

static const struct dev_pm_ops vcnl4000_pm_ops = {
        SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
                                pm_runtime_force_resume)
        SET_RUNTIME_PM_OPS(vcnl4000_runtime_suspend,
                           vcnl4000_runtime_resume, NULL)
};

static struct i2c_driver vcnl4000_driver = {
        .driver = {
                .name   = VCNL4000_DRV_NAME,
                .pm     = &vcnl4000_pm_ops,
                .of_match_table = vcnl_4000_of_match,
        },
        .probe  = vcnl4000_probe,
        .id_table = vcnl4000_id,
        .remove = vcnl4000_remove,
};

module_i2c_driver(vcnl4000_driver);

MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_AUTHOR("Mathieu Othacehe <m.othacehe@gmail.com>");
MODULE_DESCRIPTION("Vishay VCNL4000 proximity/ambient light sensor driver");
MODULE_LICENSE("GPL");