tsl2563.c

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/*
 * drivers/i2c/chips/tsl2563.c
 *
 * Copyright (C) 2008 Nokia Corporation
 *
 * Written by Timo O. Karjalainen <[email protected]>
 * Contact: Amit Kucheria <[email protected]>
 *
 * Converted to IIO driver
 * Amit Kucheria <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/err.h>
#include <linux/slab.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include "tsl2563.h"

/* Use this many bits for fraction part. */
#define ADC_FRAC_BITS       (14)

/* Given number of 1/10000's in ADC_FRAC_BITS precision. */
#define FRAC10K(f)      (((f) * (1L << (ADC_FRAC_BITS))) / (10000))

/* Bits used for fraction in calibration coefficients.*/
#define CALIB_FRAC_BITS     (10)
/* 0.5 in CALIB_FRAC_BITS precision */
#define CALIB_FRAC_HALF     (1 << (CALIB_FRAC_BITS - 1))
/* Make a fraction from a number n that was multiplied with b. */
#define CALIB_FRAC(n, b)    (((n) << CALIB_FRAC_BITS) / (b))
/* Decimal 10^(digits in sysfs presentation) */
#define CALIB_BASE_SYSFS    (1000)

#define TSL2563_CMD     (0x80)
#define TSL2563_CLEARINT    (0x40)

#define TSL2563_REG_CTRL    (0x00)
#define TSL2563_REG_TIMING  (0x01)
#define TSL2563_REG_LOWLOW  (0x02) /* data0 low threshold, 2 bytes */
#define TSL2563_REG_LOWHIGH (0x03)
#define TSL2563_REG_HIGHLOW (0x04) /* data0 high threshold, 2 bytes */
#define TSL2563_REG_HIGHHIGH    (0x05)
#define TSL2563_REG_INT     (0x06)
#define TSL2563_REG_ID      (0x0a)
#define TSL2563_REG_DATA0LOW    (0x0c) /* broadband sensor value, 2 bytes */
#define TSL2563_REG_DATA0HIGH   (0x0d)
#define TSL2563_REG_DATA1LOW    (0x0e) /* infrared sensor value, 2 bytes */
#define TSL2563_REG_DATA1HIGH   (0x0f)

#define TSL2563_CMD_POWER_ON    (0x03)
#define TSL2563_CMD_POWER_OFF   (0x00)
#define TSL2563_CTRL_POWER_MASK (0x03)

#define TSL2563_TIMING_13MS (0x00)
#define TSL2563_TIMING_100MS    (0x01)
#define TSL2563_TIMING_400MS    (0x02)
#define TSL2563_TIMING_MASK (0x03)
#define TSL2563_TIMING_GAIN16   (0x10)
#define TSL2563_TIMING_GAIN1    (0x00)

#define TSL2563_INT_DISBLED (0x00)
#define TSL2563_INT_LEVEL   (0x10)
#define TSL2563_INT_PERSIST(n)  ((n) & 0x0F)

struct tsl2563_gainlevel_coeff {
    u8 gaintime;
    u16 min;
    u16 max;
};

static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
    {
        .gaintime   = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
        .min        = 0,
        .max        = 65534,
    }, {
        .gaintime   = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
        .min        = 2048,
        .max        = 65534,
    }, {
        .gaintime   = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
        .min        = 4095,
        .max        = 37177,
    }, {
        .gaintime   = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
        .min        = 3000,
        .max        = 65535,
    },
};

struct tsl2563_chip {
    struct mutex        lock;
    struct i2c_client   *client;
    struct delayed_work poweroff_work;

    /* Remember state for suspend and resume functions */
    bool suspended;

    struct tsl2563_gainlevel_coeff const *gainlevel;

    u16         low_thres;
    u16         high_thres;
    u8          intr;
    bool            int_enabled;

    /* Calibration coefficients */
    u32         calib0;
    u32         calib1;
    int         cover_comp_gain;

    /* Cache current values, to be returned while suspended */
    u32         data0;
    u32         data1;
};

static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
{
    struct i2c_client *client = chip->client;
    u8 cmd;

    cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
    return i2c_smbus_write_byte_data(client,
                     TSL2563_CMD | TSL2563_REG_CTRL, cmd);
}

/*
 * Return value is 0 for off, 1 for on, or a negative error
 * code if reading failed.
 */
static int tsl2563_get_power(struct tsl2563_chip *chip)
{
    struct i2c_client *client = chip->client;
    int ret;

    ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
    if (ret < 0)
        return ret;

    return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
}

static int tsl2563_configure(struct tsl2563_chip *chip)
{
    int ret;

    ret = i2c_smbus_write_byte_data(chip->client,
            TSL2563_CMD | TSL2563_REG_TIMING,
            chip->gainlevel->gaintime);
    if (ret)
        goto error_ret;
    ret = i2c_smbus_write_byte_data(chip->client,
            TSL2563_CMD | TSL2563_REG_HIGHLOW,
            chip->high_thres & 0xFF);
    if (ret)
        goto error_ret;
    ret = i2c_smbus_write_byte_data(chip->client,
            TSL2563_CMD | TSL2563_REG_HIGHHIGH,
            (chip->high_thres >> 8) & 0xFF);
    if (ret)
        goto error_ret;
    ret = i2c_smbus_write_byte_data(chip->client,
            TSL2563_CMD | TSL2563_REG_LOWLOW,
            chip->low_thres & 0xFF);
    if (ret)
        goto error_ret;
    ret = i2c_smbus_write_byte_data(chip->client,
            TSL2563_CMD | TSL2563_REG_LOWHIGH,
            (chip->low_thres >> 8) & 0xFF);
/* Interrupt register is automatically written anyway if it is relevant
   so is not here */
error_ret:
    return ret;
}

static void tsl2563_poweroff_work(struct work_struct *work)
{
    struct tsl2563_chip *chip =
        container_of(work, struct tsl2563_chip, poweroff_work.work);
    tsl2563_set_power(chip, 0);
}

static int tsl2563_detect(struct tsl2563_chip *chip)
{
    int ret;

    ret = tsl2563_set_power(chip, 1);
    if (ret)
        return ret;

    ret = tsl2563_get_power(chip);
    if (ret < 0)
        return ret;

    return ret ? 0 : -ENODEV;
}

static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
{
    struct i2c_client *client = chip->client;
    int ret;

    ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
    if (ret < 0)
        return ret;

    *id = ret;

    return 0;
}

/*
 * "Normalized" ADC value is one obtained with 400ms of integration time and
 * 16x gain. This function returns the number of bits of shift needed to
 * convert between normalized values and HW values obtained using given
 * timing and gain settings.
 */
static int adc_shiftbits(u8 timing)
{
    int shift = 0;

    switch (timing & TSL2563_TIMING_MASK) {
    case TSL2563_TIMING_13MS:
        shift += 5;
        break;
    case TSL2563_TIMING_100MS:
        shift += 2;
        break;
    case TSL2563_TIMING_400MS:
        /* no-op */
        break;
    }

    if (!(timing & TSL2563_TIMING_GAIN16))
        shift += 4;

    return shift;
}

/* Convert a HW ADC value to normalized scale. */
static u32 normalize_adc(u16 adc, u8 timing)
{
    return adc << adc_shiftbits(timing);
}

static void tsl2563_wait_adc(struct tsl2563_chip *chip)
{
    unsigned int delay;

    switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
    case TSL2563_TIMING_13MS:
        delay = 14;
        break;
    case TSL2563_TIMING_100MS:
        delay = 101;
        break;
    default:
        delay = 402;
    }
    /*
     * TODO: Make sure that we wait at least required delay but why we
     * have to extend it one tick more?
     */
    schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
}

static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
{
    struct i2c_client *client = chip->client;

    if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {

        (adc > chip->gainlevel->max) ?
            chip->gainlevel++ : chip->gainlevel--;

        i2c_smbus_write_byte_data(client,
                      TSL2563_CMD | TSL2563_REG_TIMING,
                      chip->gainlevel->gaintime);

        tsl2563_wait_adc(chip);
        tsl2563_wait_adc(chip);

        return 1;
    } else
        return 0;
}

static int tsl2563_get_adc(struct tsl2563_chip *chip)
{
    struct i2c_client *client = chip->client;
    u16 adc0, adc1;
    int retry = 1;
    int ret = 0;

    if (chip->suspended)
        goto out;

    if (!chip->int_enabled) {
        cancel_delayed_work(&chip->poweroff_work);

        if (!tsl2563_get_power(chip)) {
            ret = tsl2563_set_power(chip, 1);
            if (ret)
                goto out;
            ret = tsl2563_configure(chip);
            if (ret)
                goto out;
            tsl2563_wait_adc(chip);
        }
    }

    while (retry) {
        ret = i2c_smbus_read_word_data(client,
                TSL2563_CMD | TSL2563_REG_DATA0LOW);
        if (ret < 0)
            goto out;
        adc0 = ret;

        ret = i2c_smbus_read_word_data(client,
                TSL2563_CMD | TSL2563_REG_DATA1LOW);
        if (ret < 0)
            goto out;
        adc1 = ret;

        retry = tsl2563_adjust_gainlevel(chip, adc0);
    }

    chip->data0 = normalize_adc(adc0, chip->gainlevel->gaintime);
    chip->data1 = normalize_adc(adc1, chip->gainlevel->gaintime);

    if (!chip->int_enabled)
        schedule_delayed_work(&chip->poweroff_work, 5 * HZ);

    ret = 0;
out:
    return ret;
}

static inline int calib_to_sysfs(u32 calib)
{
    return (int) (((calib * CALIB_BASE_SYSFS) +
               CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
}

static inline u32 calib_from_sysfs(int value)
{
    return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
}

/*
 * Conversions between lux and ADC values.
 *
 * The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
 * appropriate constants. Different constants are needed for different
 * kinds of light, determined by the ratio adc1/adc0 (basically the ratio
 * of the intensities in infrared and visible wavelengths). lux_table below
 * lists the upper threshold of the adc1/adc0 ratio and the corresponding
 * constants.
 */

struct tsl2563_lux_coeff {
    unsigned long ch_ratio;
    unsigned long ch0_coeff;
    unsigned long ch1_coeff;
};

static const struct tsl2563_lux_coeff lux_table[] = {
    {
        .ch_ratio   = FRAC10K(1300),
        .ch0_coeff  = FRAC10K(315),
        .ch1_coeff  = FRAC10K(262),
    }, {
        .ch_ratio   = FRAC10K(2600),
        .ch0_coeff  = FRAC10K(337),
        .ch1_coeff  = FRAC10K(430),
    }, {
        .ch_ratio   = FRAC10K(3900),
        .ch0_coeff  = FRAC10K(363),
        .ch1_coeff  = FRAC10K(529),
    }, {
        .ch_ratio   = FRAC10K(5200),
        .ch0_coeff  = FRAC10K(392),
        .ch1_coeff  = FRAC10K(605),
    }, {
        .ch_ratio   = FRAC10K(6500),
        .ch0_coeff  = FRAC10K(229),
        .ch1_coeff  = FRAC10K(291),
    }, {
        .ch_ratio   = FRAC10K(8000),
        .ch0_coeff  = FRAC10K(157),
        .ch1_coeff  = FRAC10K(180),
    }, {
        .ch_ratio   = FRAC10K(13000),
        .ch0_coeff  = FRAC10K(34),
        .ch1_coeff  = FRAC10K(26),
    }, {
        .ch_ratio   = ULONG_MAX,
        .ch0_coeff  = 0,
        .ch1_coeff  = 0,
    },
};

/*
 * Convert normalized, scaled ADC values to lux.
 */
static unsigned int adc_to_lux(u32 adc0, u32 adc1)
{
    const struct tsl2563_lux_coeff *lp = lux_table;
    unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;

    ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;

    while (lp->ch_ratio < ratio)
        lp++;

    lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;

    return (unsigned int) (lux >> ADC_FRAC_BITS);
}

/*--------------------------------------------------------------*/
/*                      Sysfs interface                         */
/*--------------------------------------------------------------*/


/* Apply calibration coefficient to ADC count. */
static u32 calib_adc(u32 adc, u32 calib)
{
    unsigned long scaled = adc;

    scaled *= calib;
    scaled >>= CALIB_FRAC_BITS;

    return (u32) scaled;
}

static int tsl2563_write_raw(struct iio_dev *indio_dev,
                   struct iio_chan_spec const *chan,
                   int val,
                   int val2,
                   long mask)
{
    struct tsl2563_chip *chip = iio_priv(indio_dev);

    if (chan->channel == IIO_MOD_LIGHT_BOTH)
        chip->calib0 = calib_from_sysfs(val);
    else
        chip->calib1 = calib_from_sysfs(val);

    return 0;
}

static int tsl2563_read_raw(struct iio_dev *indio_dev,
                struct iio_chan_spec const *chan,
                int *val,
                int *val2,
                long m)
{
    int ret = -EINVAL;
    u32 calib0, calib1;
    struct tsl2563_chip *chip = iio_priv(indio_dev);

    mutex_lock(&chip->lock);
    switch (m) {
    case IIO_CHAN_INFO_RAW:
    case IIO_CHAN_INFO_PROCESSED:
        switch (chan->type) {
        case IIO_LIGHT:
            ret = tsl2563_get_adc(chip);
            if (ret)
                goto error_ret;
            calib0 = calib_adc(chip->data0, chip->calib0) *
                chip->cover_comp_gain;
            calib1 = calib_adc(chip->data1, chip->calib1) *
                chip->cover_comp_gain;
            *val = adc_to_lux(calib0, calib1);
            ret = IIO_VAL_INT;
            break;
        case IIO_INTENSITY:
            ret = tsl2563_get_adc(chip);
            if (ret)
                goto error_ret;
            if (chan->channel == 0)
                *val = chip->data0;
            else
                *val = chip->data1;
            ret = IIO_VAL_INT;
            break;
        default:
            break;
        }
        break;

    case IIO_CHAN_INFO_CALIBSCALE:
        if (chan->channel == 0)
            *val = calib_to_sysfs(chip->calib0);
        else
            *val = calib_to_sysfs(chip->calib1);
        ret = IIO_VAL_INT;
        break;
    default:
        ret = -EINVAL;
        goto error_ret;
    }

error_ret:
    mutex_unlock(&chip->lock);
    return ret;
}

static const struct iio_chan_spec tsl2563_channels[] = {
    {
        .type = IIO_LIGHT,
        .indexed = 1,
        .info_mask = IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT,
        .channel = 0,
    }, {
        .type = IIO_INTENSITY,
        .modified = 1,
        .channel2 = IIO_MOD_LIGHT_BOTH,
        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
        IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
        .event_mask = (IIO_EV_BIT(IIO_EV_TYPE_THRESH,
                      IIO_EV_DIR_RISING) |
                   IIO_EV_BIT(IIO_EV_TYPE_THRESH,
                      IIO_EV_DIR_FALLING)),
    }, {
        .type = IIO_INTENSITY,
        .modified = 1,
        .channel2 = IIO_MOD_LIGHT_IR,
        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
        IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
    }
};

static int tsl2563_read_thresh(struct iio_dev *indio_dev,
                   u64 event_code,
                   int *val)
{
    struct tsl2563_chip *chip = iio_priv(indio_dev);

    switch (IIO_EVENT_CODE_EXTRACT_DIR(event_code)) {
    case IIO_EV_DIR_RISING:
        *val = chip->high_thres;
        break;
    case IIO_EV_DIR_FALLING:
        *val = chip->low_thres;
        break;
    default:
        return -EINVAL;
    }

    return 0;
}

static int tsl2563_write_thresh(struct iio_dev *indio_dev,
                  u64 event_code,
                  int val)
{
    struct tsl2563_chip *chip = iio_priv(indio_dev);
    int ret;
    u8 address;

    if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == IIO_EV_DIR_RISING)
        address = TSL2563_REG_HIGHLOW;
    else
        address = TSL2563_REG_LOWLOW;
    mutex_lock(&chip->lock);
    ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
                    val & 0xFF);
    if (ret)
        goto error_ret;
    ret = i2c_smbus_write_byte_data(chip->client,
                    TSL2563_CMD | (address + 1),
                    (val >> 8) & 0xFF);
    if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == IIO_EV_DIR_RISING)
        chip->high_thres = val;
    else
        chip->low_thres = val;

error_ret:
    mutex_unlock(&chip->lock);

    return ret;
}

static irqreturn_t tsl2563_event_handler(int irq, void *private)
{
    struct iio_dev *dev_info = private;
    struct tsl2563_chip *chip = iio_priv(dev_info);

    iio_push_event(dev_info,
               IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
                        0,
                        IIO_EV_TYPE_THRESH,
                        IIO_EV_DIR_EITHER),
               iio_get_time_ns());

    /* clear the interrupt and push the event */
    i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
    return IRQ_HANDLED;
}

static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
                      u64 event_code,
                      int state)
{
    struct tsl2563_chip *chip = iio_priv(indio_dev);
    int ret = 0;

    mutex_lock(&chip->lock);
    if (state && !(chip->intr & 0x30)) {
        chip->intr &= ~0x30;
        chip->intr |= 0x10;
        /* ensure the chip is actually on */
        cancel_delayed_work(&chip->poweroff_work);
        if (!tsl2563_get_power(chip)) {
            ret = tsl2563_set_power(chip, 1);
            if (ret)
                goto out;
            ret = tsl2563_configure(chip);
            if (ret)
                goto out;
        }
        ret = i2c_smbus_write_byte_data(chip->client,
                        TSL2563_CMD | TSL2563_REG_INT,
                        chip->intr);
        chip->int_enabled = true;
    }

    if (!state && (chip->intr & 0x30)) {
        chip->intr |= ~0x30;
        ret = i2c_smbus_write_byte_data(chip->client,
                        TSL2563_CMD | TSL2563_REG_INT,
                        chip->intr);
        chip->int_enabled = false;
        /* now the interrupt is not enabled, we can go to sleep */
        schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
    }
out:
    mutex_unlock(&chip->lock);

    return ret;
}

static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
                     u64 event_code)
{
    struct tsl2563_chip *chip = iio_priv(indio_dev);
    int ret;

    mutex_lock(&chip->lock);
    ret = i2c_smbus_read_byte_data(chip->client,
                       TSL2563_CMD | TSL2563_REG_INT);
    mutex_unlock(&chip->lock);
    if (ret < 0)
        goto error_ret;
    ret = !!(ret & 0x30);
error_ret:

    return ret;
}

/*--------------------------------------------------------------*/
/*                      Probe, Attach, Remove                   */
/*--------------------------------------------------------------*/
static struct i2c_driver tsl2563_i2c_driver;

static const struct iio_info tsl2563_info_no_irq = {
    .driver_module = THIS_MODULE,
    .read_raw = &tsl2563_read_raw,
    .write_raw = &tsl2563_write_raw,
};

static const struct iio_info tsl2563_info = {
    .driver_module = THIS_MODULE,
    .read_raw = &tsl2563_read_raw,
    .write_raw = &tsl2563_write_raw,
    .read_event_value = &tsl2563_read_thresh,
    .write_event_value = &tsl2563_write_thresh,
    .read_event_config = &tsl2563_read_interrupt_config,
    .write_event_config = &tsl2563_write_interrupt_config,
};

static int __devinit tsl2563_probe(struct i2c_client *client,
                const struct i2c_device_id *device_id)
{
    struct iio_dev *indio_dev;
    struct tsl2563_chip *chip;
    struct tsl2563_platform_data *pdata = client->dev.platform_data;
    int err = 0;
    u8 id = 0;

    indio_dev = iio_device_alloc(sizeof(*chip));
    if (!indio_dev)
        return -ENOMEM;

    chip = iio_priv(indio_dev);

    i2c_set_clientdata(client, chip);
    chip->client = client;

    err = tsl2563_detect(chip);
    if (err) {
        dev_err(&client->dev, "detect error %d\n", -err);
        goto fail1;
    }

    err = tsl2563_read_id(chip, &id);
    if (err) {
        dev_err(&client->dev, "read id error %d\n", -err);
        goto fail1;
    }

    mutex_init(&chip->lock);

    /* Default values used until userspace says otherwise */
    chip->low_thres = 0x0;
    chip->high_thres = 0xffff;
    chip->gainlevel = tsl2563_gainlevel_table;
    chip->intr = TSL2563_INT_PERSIST(4);
    chip->calib0 = calib_from_sysfs(CALIB_BASE_SYSFS);
    chip->calib1 = calib_from_sysfs(CALIB_BASE_SYSFS);

    if (pdata)
        chip->cover_comp_gain = pdata->cover_comp_gain;
    else
        chip->cover_comp_gain = 1;

    dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
    indio_dev->name = client->name;
    indio_dev->channels = tsl2563_channels;
    indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
    indio_dev->dev.parent = &client->dev;
    indio_dev->modes = INDIO_DIRECT_MODE;

    if (client->irq)
        indio_dev->info = &tsl2563_info;
    else
        indio_dev->info = &tsl2563_info_no_irq;

    if (client->irq) {
        err = request_threaded_irq(client->irq,
                       NULL,
                       &tsl2563_event_handler,
                       IRQF_TRIGGER_RISING | IRQF_ONESHOT,
                       "tsl2563_event",
                       indio_dev);
        if (err) {
            dev_err(&client->dev, "irq request error %d\n", -err);
            goto fail1;
        }
    }

    err = tsl2563_configure(chip);
    if (err) {
        dev_err(&client->dev, "configure error %d\n", -err);
        goto fail2;
    }

    INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);

    /* The interrupt cannot yet be enabled so this is fine without lock */
    schedule_delayed_work(&chip->poweroff_work, 5 * HZ);

    err = iio_device_register(indio_dev);
    if (err) {
        dev_err(&client->dev, "iio registration error %d\n", -err);
        goto fail3;
    }

    return 0;

fail3:
    cancel_delayed_work(&chip->poweroff_work);
    flush_scheduled_work();
fail2:
    if (client->irq)
        free_irq(client->irq, indio_dev);
fail1:
    iio_device_free(indio_dev);
    return err;
}

static int __devexit tsl2563_remove(struct i2c_client *client)
{
    struct tsl2563_chip *chip = i2c_get_clientdata(client);
    struct iio_dev *indio_dev = iio_priv_to_dev(chip);

    iio_device_unregister(indio_dev);
    if (!chip->int_enabled)
        cancel_delayed_work(&chip->poweroff_work);
    /* Ensure that interrupts are disabled - then flush any bottom halves */
    chip->intr |= ~0x30;
    i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
                  chip->intr);
    flush_scheduled_work();
    tsl2563_set_power(chip, 0);
    if (client->irq)
        free_irq(client->irq, indio_dev);

    iio_device_free(indio_dev);

    return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tsl2563_suspend(struct device *dev)
{
    struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
    int ret;

    mutex_lock(&chip->lock);

    ret = tsl2563_set_power(chip, 0);
    if (ret)
        goto out;

    chip->suspended = true;

out:
    mutex_unlock(&chip->lock);
    return ret;
}

static int tsl2563_resume(struct device *dev)
{
    struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
    int ret;

    mutex_lock(&chip->lock);

    ret = tsl2563_set_power(chip, 1);
    if (ret)
        goto out;

    ret = tsl2563_configure(chip);
    if (ret)
        goto out;

    chip->suspended = false;

out:
    mutex_unlock(&chip->lock);
    return ret;
}

static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume);
#define TSL2563_PM_OPS (&tsl2563_pm_ops)
#else
#define TSL2563_PM_OPS NULL
#endif

static const struct i2c_device_id tsl2563_id[] = {
    { "tsl2560", 0 },
    { "tsl2561", 1 },
    { "tsl2562", 2 },
    { "tsl2563", 3 },
    {}
};
MODULE_DEVICE_TABLE(i2c, tsl2563_id);

static struct i2c_driver tsl2563_i2c_driver = {
    .driver = {
        .name    = "tsl2563",
        .pm = TSL2563_PM_OPS,
    },
    .probe      = tsl2563_probe,
    .remove     = __devexit_p(tsl2563_remove),
    .id_table   = tsl2563_id,
};
module_i2c_driver(tsl2563_i2c_driver);

MODULE_AUTHOR("Nokia Corporation");
MODULE_DESCRIPTION("tsl2563 light sensor driver");
MODULE_LICENSE("GPL");