adp8860_bl.c

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/*
 * Backlight driver for Analog Devices ADP8860 Backlight Devices
 *
 * Copyright 2009-2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

#include <linux/i2c/adp8860.h>
#define ADP8860_EXT_FEATURES
#define ADP8860_USE_LEDS

#define ADP8860_MFDVID 0x00 /* Manufacturer and device ID */
#define ADP8860_MDCR 0x01 /* Device mode and status */
#define ADP8860_MDCR2 0x02 /* Device mode and Status Register 2 */
#define ADP8860_INTR_EN 0x03 /* Interrupts enable */
#define ADP8860_CFGR 0x04 /* Configuration register */
#define ADP8860_BLSEN 0x05 /* Sink enable backlight or independent */
#define ADP8860_BLOFF 0x06 /* Backlight off timeout */
#define ADP8860_BLDIM 0x07 /* Backlight dim timeout */
#define ADP8860_BLFR 0x08 /* Backlight fade in and out rates */
#define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */
#define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */
#define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */
#define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */
#define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */
#define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */
#define ADP8860_ISCFR 0x0F /* Independent sink current fade control register */
#define ADP8860_ISCC 0x10 /* Independent sink current control register */
#define ADP8860_ISCT1 0x11 /* Independent Sink Current Timer Register LED[7:5] */
#define ADP8860_ISCT2 0x12 /* Independent Sink Current Timer Register LED[4:1] */
#define ADP8860_ISCF 0x13 /* Independent sink current fade register */
#define ADP8860_ISC7 0x14 /* Independent Sink Current LED7 */
#define ADP8860_ISC6 0x15 /* Independent Sink Current LED6 */
#define ADP8860_ISC5 0x16 /* Independent Sink Current LED5 */
#define ADP8860_ISC4 0x17 /* Independent Sink Current LED4 */
#define ADP8860_ISC3 0x18 /* Independent Sink Current LED3 */
#define ADP8860_ISC2 0x19 /* Independent Sink Current LED2 */
#define ADP8860_ISC1 0x1A /* Independent Sink Current LED1 */
#define ADP8860_CCFG 0x1B /* Comparator configuration */
#define ADP8860_CCFG2 0x1C /* Second comparator configuration */
#define ADP8860_L2_TRP 0x1D /* L2 comparator reference */
#define ADP8860_L2_HYS 0x1E /* L2 hysteresis */
#define ADP8860_L3_TRP 0x1F /* L3 comparator reference */
#define ADP8860_L3_HYS 0x20 /* L3 hysteresis */
#define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */
#define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */
#define ADP8860_PH2LEVL 0x23 /* Second phototransistor ambient light level-low byte register */
#define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */

#define ADP8860_MANUFID     0x0  /* Analog Devices ADP8860 Manufacturer ID */
#define ADP8861_MANUFID     0x4  /* Analog Devices ADP8861 Manufacturer ID */
#define ADP8863_MANUFID     0x2  /* Analog Devices ADP8863 Manufacturer ID */

#define ADP8860_DEVID(x)    ((x) & 0xF)
#define ADP8860_MANID(x)    ((x) >> 4)

/* MDCR Device mode and status */
#define INT_CFG         (1 << 6)
#define NSTBY           (1 << 5)
#define DIM_EN          (1 << 4)
#define GDWN_DIS        (1 << 3)
#define SIS_EN          (1 << 2)
#define CMP_AUTOEN      (1 << 1)
#define BLEN            (1 << 0)

/* ADP8860_CCFG Main ALS comparator level enable */
#define L3_EN           (1 << 1)
#define L2_EN           (1 << 0)

#define CFGR_BLV_SHIFT      3
#define CFGR_BLV_MASK       0x3
#define ADP8860_FLAG_LED_MASK   0xFF

#define FADE_VAL(in, out)   ((0xF & (in)) | ((0xF & (out)) << 4))
#define BL_CFGR_VAL(law, blv)   ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))
#define ALS_CCFG_VAL(filt)  ((0x7 & filt) << 5)

enum {
    adp8860,
    adp8861,
    adp8863
};

struct adp8860_led {
    struct led_classdev cdev;
    struct work_struct  work;
    struct i2c_client   *client;
    enum led_brightness new_brightness;
    int         id;
    int         flags;
};

struct adp8860_bl {
    struct i2c_client *client;
    struct backlight_device *bl;
    struct adp8860_led *led;
    struct adp8860_backlight_platform_data *pdata;
    struct mutex lock;
    unsigned long cached_daylight_max;
    int id;
    int revid;
    int current_brightness;
    unsigned en_ambl_sens:1;
    unsigned gdwn_dis:1;
};

static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val)
{
    int ret;

    ret = i2c_smbus_read_byte_data(client, reg);
    if (ret < 0) {
        dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
        return ret;
    }

    *val = (uint8_t)ret;
    return 0;
}

static int adp8860_write(struct i2c_client *client, u8 reg, u8 val)
{
    return i2c_smbus_write_byte_data(client, reg, val);
}

static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
{
    struct adp8860_bl *data = i2c_get_clientdata(client);
    uint8_t reg_val;
    int ret;

    mutex_lock(&data->lock);

    ret = adp8860_read(client, reg, &reg_val);

    if (!ret && ((reg_val & bit_mask) != bit_mask)) {
        reg_val |= bit_mask;
        ret = adp8860_write(client, reg, reg_val);
    }

    mutex_unlock(&data->lock);
    return ret;
}

static int adp8860_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
{
    struct adp8860_bl *data = i2c_get_clientdata(client);
    uint8_t reg_val;
    int ret;

    mutex_lock(&data->lock);

    ret = adp8860_read(client, reg, &reg_val);

    if (!ret && (reg_val & bit_mask)) {
        reg_val &= ~bit_mask;
        ret = adp8860_write(client, reg, reg_val);
    }

    mutex_unlock(&data->lock);
    return ret;
}

/*
 * Independent sink / LED
 */
#if defined(ADP8860_USE_LEDS)
static void adp8860_led_work(struct work_struct *work)
{
    struct adp8860_led *led = container_of(work, struct adp8860_led, work);
    adp8860_write(led->client, ADP8860_ISC1 - led->id + 1,
             led->new_brightness >> 1);
}

static void adp8860_led_set(struct led_classdev *led_cdev,
               enum led_brightness value)
{
    struct adp8860_led *led;

    led = container_of(led_cdev, struct adp8860_led, cdev);
    led->new_brightness = value;
    schedule_work(&led->work);
}

static int adp8860_led_setup(struct adp8860_led *led)
{
    struct i2c_client *client = led->client;
    int ret = 0;

    ret = adp8860_write(client, ADP8860_ISC1 - led->id + 1, 0);
    ret |= adp8860_set_bits(client, ADP8860_ISCC, 1 << (led->id - 1));

    if (led->id > 4)
        ret |= adp8860_set_bits(client, ADP8860_ISCT1,
                (led->flags & 0x3) << ((led->id - 5) * 2));
    else
        ret |= adp8860_set_bits(client, ADP8860_ISCT2,
                (led->flags & 0x3) << ((led->id - 1) * 2));

    return ret;
}

static int __devinit adp8860_led_probe(struct i2c_client *client)
{
    struct adp8860_backlight_platform_data *pdata =
        client->dev.platform_data;
    struct adp8860_bl *data = i2c_get_clientdata(client);
    struct adp8860_led *led, *led_dat;
    struct led_info *cur_led;
    int ret, i;

    led = devm_kzalloc(&client->dev, sizeof(*led) * pdata->num_leds,
                GFP_KERNEL);
    if (led == NULL) {
        dev_err(&client->dev, "failed to alloc memory\n");
        return -ENOMEM;
    }

    ret = adp8860_write(client, ADP8860_ISCFR, pdata->led_fade_law);
    ret = adp8860_write(client, ADP8860_ISCT1,
            (pdata->led_on_time & 0x3) << 6);
    ret |= adp8860_write(client, ADP8860_ISCF,
            FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));

    if (ret) {
        dev_err(&client->dev, "failed to write\n");
        return ret;
    }

    for (i = 0; i < pdata->num_leds; ++i) {
        cur_led = &pdata->leds[i];
        led_dat = &led[i];

        led_dat->id = cur_led->flags & ADP8860_FLAG_LED_MASK;

        if (led_dat->id > 7 || led_dat->id < 1) {
            dev_err(&client->dev, "Invalid LED ID %d\n",
                led_dat->id);
            goto err;
        }

        if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {
            dev_err(&client->dev, "LED %d used by Backlight\n",
                led_dat->id);
            goto err;
        }

        led_dat->cdev.name = cur_led->name;
        led_dat->cdev.default_trigger = cur_led->default_trigger;
        led_dat->cdev.brightness_set = adp8860_led_set;
        led_dat->cdev.brightness = LED_OFF;
        led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;
        led_dat->client = client;
        led_dat->new_brightness = LED_OFF;
        INIT_WORK(&led_dat->work, adp8860_led_work);

        ret = led_classdev_register(&client->dev, &led_dat->cdev);
        if (ret) {
            dev_err(&client->dev, "failed to register LED %d\n",
                led_dat->id);
            goto err;
        }

        ret = adp8860_led_setup(led_dat);
        if (ret) {
            dev_err(&client->dev, "failed to write\n");
            i++;
            goto err;
        }
    }

    data->led = led;

    return 0;

 err:
    for (i = i - 1; i >= 0; --i) {
        led_classdev_unregister(&led[i].cdev);
        cancel_work_sync(&led[i].work);
    }

    return ret;
}

static int __devexit adp8860_led_remove(struct i2c_client *client)
{
    struct adp8860_backlight_platform_data *pdata =
        client->dev.platform_data;
    struct adp8860_bl *data = i2c_get_clientdata(client);
    int i;

    for (i = 0; i < pdata->num_leds; i++) {
        led_classdev_unregister(&data->led[i].cdev);
        cancel_work_sync(&data->led[i].work);
    }

    return 0;
}
#else
static int __devinit adp8860_led_probe(struct i2c_client *client)
{
    return 0;
}

static int __devexit adp8860_led_remove(struct i2c_client *client)
{
    return 0;
}
#endif

static int adp8860_bl_set(struct backlight_device *bl, int brightness)
{
    struct adp8860_bl *data = bl_get_data(bl);
    struct i2c_client *client = data->client;
    int ret = 0;

    if (data->en_ambl_sens) {
        if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) {
            /* Disable Ambient Light auto adjust */
            ret |= adp8860_clr_bits(client, ADP8860_MDCR,
                    CMP_AUTOEN);
            ret |= adp8860_write(client, ADP8860_BLMX1, brightness);
        } else {
            /*
             * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
             * restore daylight l1 sysfs brightness
             */
            ret |= adp8860_write(client, ADP8860_BLMX1,
                     data->cached_daylight_max);
            ret |= adp8860_set_bits(client, ADP8860_MDCR,
                     CMP_AUTOEN);
        }
    } else
        ret |= adp8860_write(client, ADP8860_BLMX1, brightness);

    if (data->current_brightness && brightness == 0)
        ret |= adp8860_set_bits(client,
                ADP8860_MDCR, DIM_EN);
    else if (data->current_brightness == 0 && brightness)
        ret |= adp8860_clr_bits(client,
                ADP8860_MDCR, DIM_EN);

    if (!ret)
        data->current_brightness = brightness;

    return ret;
}

static int adp8860_bl_update_status(struct backlight_device *bl)
{
    int brightness = bl->props.brightness;
    if (bl->props.power != FB_BLANK_UNBLANK)
        brightness = 0;

    if (bl->props.fb_blank != FB_BLANK_UNBLANK)
        brightness = 0;

    return adp8860_bl_set(bl, brightness);
}

static int adp8860_bl_get_brightness(struct backlight_device *bl)
{
    struct adp8860_bl *data = bl_get_data(bl);

    return data->current_brightness;
}

static const struct backlight_ops adp8860_bl_ops = {
    .update_status  = adp8860_bl_update_status,
    .get_brightness = adp8860_bl_get_brightness,
};

static int adp8860_bl_setup(struct backlight_device *bl)
{
    struct adp8860_bl *data = bl_get_data(bl);
    struct i2c_client *client = data->client;
    struct adp8860_backlight_platform_data *pdata = data->pdata;
    int ret = 0;

    ret |= adp8860_write(client, ADP8860_BLSEN, ~pdata->bl_led_assign);
    ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max);
    ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim);

    if (data->en_ambl_sens) {
        data->cached_daylight_max = pdata->l1_daylight_max;
        ret |= adp8860_write(client, ADP8860_BLMX2,
                        pdata->l2_office_max);
        ret |= adp8860_write(client, ADP8860_BLDM2,
                        pdata->l2_office_dim);
        ret |= adp8860_write(client, ADP8860_BLMX3,
                        pdata->l3_dark_max);
        ret |= adp8860_write(client, ADP8860_BLDM3,
                        pdata->l3_dark_dim);

        ret |= adp8860_write(client, ADP8860_L2_TRP, pdata->l2_trip);
        ret |= adp8860_write(client, ADP8860_L2_HYS, pdata->l2_hyst);
        ret |= adp8860_write(client, ADP8860_L3_TRP, pdata->l3_trip);
        ret |= adp8860_write(client, ADP8860_L3_HYS, pdata->l3_hyst);
        ret |= adp8860_write(client, ADP8860_CCFG, L2_EN | L3_EN |
                        ALS_CCFG_VAL(pdata->abml_filt));
    }

    ret |= adp8860_write(client, ADP8860_CFGR,
            BL_CFGR_VAL(pdata->bl_fade_law, 0));

    ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in,
            pdata->bl_fade_out));

    ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY |
            (data->gdwn_dis ? GDWN_DIS : 0));

    return ret;
}

static ssize_t adp8860_show(struct device *dev, char *buf, int reg)
{
    struct adp8860_bl *data = dev_get_drvdata(dev);
    int error;
    uint8_t reg_val;

    mutex_lock(&data->lock);
    error = adp8860_read(data->client, reg, &reg_val);
    mutex_unlock(&data->lock);

    if (error < 0)
        return error;

    return sprintf(buf, "%u\n", reg_val);
}

static ssize_t adp8860_store(struct device *dev, const char *buf,
             size_t count, int reg)
{
    struct adp8860_bl *data = dev_get_drvdata(dev);
    unsigned long val;
    int ret;

    ret = kstrtoul(buf, 10, &val);
    if (ret)
        return ret;

    mutex_lock(&data->lock);
    adp8860_write(data->client, reg, val);
    mutex_unlock(&data->lock);

    return count;
}

static ssize_t adp8860_bl_l3_dark_max_show(struct device *dev,
                     struct device_attribute *attr, char *buf)
{
    return adp8860_show(dev, buf, ADP8860_BLMX3);
}

static ssize_t adp8860_bl_l3_dark_max_store(struct device *dev,
        struct device_attribute *attr, const char *buf, size_t count)
{
    return adp8860_store(dev, buf, count, ADP8860_BLMX3);
}

static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show,
            adp8860_bl_l3_dark_max_store);

static ssize_t adp8860_bl_l2_office_max_show(struct device *dev,
        struct device_attribute *attr, char *buf)
{
    return adp8860_show(dev, buf, ADP8860_BLMX2);
}

static ssize_t adp8860_bl_l2_office_max_store(struct device *dev,
        struct device_attribute *attr, const char *buf, size_t count)
{
    return adp8860_store(dev, buf, count, ADP8860_BLMX2);
}
static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show,
            adp8860_bl_l2_office_max_store);

static ssize_t adp8860_bl_l1_daylight_max_show(struct device *dev,
            struct device_attribute *attr, char *buf)
{
    return adp8860_show(dev, buf, ADP8860_BLMX1);
}

static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev,
        struct device_attribute *attr, const char *buf, size_t count)
{
    struct adp8860_bl *data = dev_get_drvdata(dev);
    int ret = kstrtoul(buf, 10, &data->cached_daylight_max);
    if (ret)
        return ret;

    return adp8860_store(dev, buf, count, ADP8860_BLMX1);
}
static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show,
            adp8860_bl_l1_daylight_max_store);

static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev,
            struct device_attribute *attr, char *buf)
{
    return adp8860_show(dev, buf, ADP8860_BLDM3);
}

static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev,
                     struct device_attribute *attr,
                     const char *buf, size_t count)
{
    return adp8860_store(dev, buf, count, ADP8860_BLDM3);
}
static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show,
            adp8860_bl_l3_dark_dim_store);

static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev,
            struct device_attribute *attr, char *buf)
{
    return adp8860_show(dev, buf, ADP8860_BLDM2);
}

static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev,
                     struct device_attribute *attr,
                     const char *buf, size_t count)
{
    return adp8860_store(dev, buf, count, ADP8860_BLDM2);
}
static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show,
            adp8860_bl_l2_office_dim_store);

static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev,
                     struct device_attribute *attr, char *buf)
{
    return adp8860_show(dev, buf, ADP8860_BLDM1);
}

static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev,
                     struct device_attribute *attr,
                     const char *buf, size_t count)
{
    return adp8860_store(dev, buf, count, ADP8860_BLDM1);
}
static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show,
            adp8860_bl_l1_daylight_dim_store);

#ifdef ADP8860_EXT_FEATURES
static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev,
                     struct device_attribute *attr, char *buf)
{
    struct adp8860_bl *data = dev_get_drvdata(dev);
    int error;
    uint8_t reg_val;
    uint16_t ret_val;

    mutex_lock(&data->lock);
    error = adp8860_read(data->client, ADP8860_PH1LEVL, &reg_val);
    ret_val = reg_val;
    error |= adp8860_read(data->client, ADP8860_PH1LEVH, &reg_val);
    mutex_unlock(&data->lock);

    if (error < 0)
        return error;

    /* Return 13-bit conversion value for the first light sensor */
    ret_val += (reg_val & 0x1F) << 8;

    return sprintf(buf, "%u\n", ret_val);
}
static DEVICE_ATTR(ambient_light_level, 0444,
        adp8860_bl_ambient_light_level_show, NULL);

static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev,
                     struct device_attribute *attr, char *buf)
{
    struct adp8860_bl *data = dev_get_drvdata(dev);
    int error;
    uint8_t reg_val;

    mutex_lock(&data->lock);
    error = adp8860_read(data->client, ADP8860_CFGR, &reg_val);
    mutex_unlock(&data->lock);

    if (error < 0)
        return error;

    return sprintf(buf, "%u\n",
        ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
}

static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev,
                     struct device_attribute *attr,
                     const char *buf, size_t count)
{
    struct adp8860_bl *data = dev_get_drvdata(dev);
    unsigned long val;
    uint8_t reg_val;
    int ret;

    ret = kstrtoul(buf, 10, &val);
    if (ret)
        return ret;

    if (val == 0) {
        /* Enable automatic ambient light sensing */
        adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
    } else if ((val > 0) && (val <= 3)) {
        /* Disable automatic ambient light sensing */
        adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);

        /* Set user supplied ambient light zone */
        mutex_lock(&data->lock);
        adp8860_read(data->client, ADP8860_CFGR, &reg_val);
        reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
        reg_val |= (val - 1) << CFGR_BLV_SHIFT;
        adp8860_write(data->client, ADP8860_CFGR, reg_val);
        mutex_unlock(&data->lock);
    }

    return count;
}
static DEVICE_ATTR(ambient_light_zone, 0664,
        adp8860_bl_ambient_light_zone_show,
        adp8860_bl_ambient_light_zone_store);
#endif

static struct attribute *adp8860_bl_attributes[] = {
    &dev_attr_l3_dark_max.attr,
    &dev_attr_l3_dark_dim.attr,
    &dev_attr_l2_office_max.attr,
    &dev_attr_l2_office_dim.attr,
    &dev_attr_l1_daylight_max.attr,
    &dev_attr_l1_daylight_dim.attr,
#ifdef ADP8860_EXT_FEATURES
    &dev_attr_ambient_light_level.attr,
    &dev_attr_ambient_light_zone.attr,
#endif
    NULL
};

static const struct attribute_group adp8860_bl_attr_group = {
    .attrs = adp8860_bl_attributes,
};

static int __devinit adp8860_probe(struct i2c_client *client,
                    const struct i2c_device_id *id)
{
    struct backlight_device *bl;
    struct adp8860_bl *data;
    struct adp8860_backlight_platform_data *pdata =
        client->dev.platform_data;
    struct backlight_properties props;
    uint8_t reg_val;
    int ret;

    if (!i2c_check_functionality(client->adapter,
                    I2C_FUNC_SMBUS_BYTE_DATA)) {
        dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
        return -EIO;
    }

    if (!pdata) {
        dev_err(&client->dev, "no platform data?\n");
        return -EINVAL;
    }

    data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
    if (data == NULL)
        return -ENOMEM;

    ret = adp8860_read(client, ADP8860_MFDVID, &reg_val);
    if (ret < 0)
        return ret;

    switch (ADP8860_MANID(reg_val)) {
    case ADP8863_MANUFID:
        data->gdwn_dis = !!pdata->gdwn_dis;
    case ADP8860_MANUFID:
        data->en_ambl_sens = !!pdata->en_ambl_sens;
        break;
    case ADP8861_MANUFID:
        data->gdwn_dis = !!pdata->gdwn_dis;
        break;
    default:
        dev_err(&client->dev, "failed to probe\n");
        return -ENODEV;
    }

    /* It's confirmed that the DEVID field is actually a REVID */

    data->revid = ADP8860_DEVID(reg_val);
    data->client = client;
    data->pdata = pdata;
    data->id = id->driver_data;
    data->current_brightness = 0;
    i2c_set_clientdata(client, data);

    memset(&props, 0, sizeof(props));
    props.type = BACKLIGHT_RAW;
    props.max_brightness = ADP8860_MAX_BRIGHTNESS;

    mutex_init(&data->lock);

    bl = backlight_device_register(dev_driver_string(&client->dev),
            &client->dev, data, &adp8860_bl_ops, &props);
    if (IS_ERR(bl)) {
        dev_err(&client->dev, "failed to register backlight\n");
        return PTR_ERR(bl);
    }

    bl->props.brightness = ADP8860_MAX_BRIGHTNESS;

    data->bl = bl;

    if (data->en_ambl_sens)
        ret = sysfs_create_group(&bl->dev.kobj,
            &adp8860_bl_attr_group);

    if (ret) {
        dev_err(&client->dev, "failed to register sysfs\n");
        goto out1;
    }

    ret = adp8860_bl_setup(bl);
    if (ret) {
        ret = -EIO;
        goto out;
    }

    backlight_update_status(bl);

    dev_info(&client->dev, "%s Rev.%d Backlight\n",
        client->name, data->revid);

    if (pdata->num_leds)
        adp8860_led_probe(client);

    return 0;

out:
    if (data->en_ambl_sens)
        sysfs_remove_group(&data->bl->dev.kobj,
            &adp8860_bl_attr_group);
out1:
    backlight_device_unregister(bl);

    return ret;
}

static int __devexit adp8860_remove(struct i2c_client *client)
{
    struct adp8860_bl *data = i2c_get_clientdata(client);

    adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);

    if (data->led)
        adp8860_led_remove(client);

    if (data->en_ambl_sens)
        sysfs_remove_group(&data->bl->dev.kobj,
            &adp8860_bl_attr_group);

    backlight_device_unregister(data->bl);

    return 0;
}

#ifdef CONFIG_PM
static int adp8860_i2c_suspend(struct i2c_client *client, pm_message_t message)
{
    adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);

    return 0;
}

static int adp8860_i2c_resume(struct i2c_client *client)
{
    adp8860_set_bits(client, ADP8860_MDCR, NSTBY);

    return 0;
}
#else
#define adp8860_i2c_suspend NULL
#define adp8860_i2c_resume NULL
#endif

static const struct i2c_device_id adp8860_id[] = {
    { "adp8860", adp8860 },
    { "adp8861", adp8861 },
    { "adp8863", adp8863 },
    { }
};
MODULE_DEVICE_TABLE(i2c, adp8860_id);

static struct i2c_driver adp8860_driver = {
    .driver = {
        .name = KBUILD_MODNAME,
    },
    .probe    = adp8860_probe,
    .remove   = __devexit_p(adp8860_remove),
    .suspend = adp8860_i2c_suspend,
    .resume  = adp8860_i2c_resume,
    .id_table = adp8860_id,
};

module_i2c_driver(adp8860_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("ADP8860 Backlight driver");
MODULE_ALIAS("i2c:adp8860-backlight");