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    Subject[PATCH] backlight: new driver for the ADP8870 backlight devices
    Date
    From: Michael Hennerich <michael.hennerich@analog.com>

    Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
    Signed-off-by: Mike Frysinger <vapier@gentoo.org>
    ---
    Andrew: could you pick this up ? we sent this out a few months ago with
    no response/feedback.

    drivers/video/backlight/Kconfig | 12 +
    drivers/video/backlight/Makefile | 1 +
    drivers/video/backlight/adp8870_bl.c | 917 ++++++++++++++++++++++++++++++++++
    include/linux/i2c/adp8870.h | 153 ++++++
    4 files changed, 1083 insertions(+), 0 deletions(-)
    create mode 100644 drivers/video/backlight/adp8870_bl.c
    create mode 100644 include/linux/i2c/adp8870.h

    diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
    index e54a337..5818cd6 100644
    --- a/drivers/video/backlight/Kconfig
    +++ b/drivers/video/backlight/Kconfig
    @@ -294,6 +294,18 @@ config BACKLIGHT_ADP8860
    To compile this driver as a module, choose M here: the module will
    be called adp8860_bl.

    +config BACKLIGHT_ADP8870
    + tristate "Backlight Driver for ADP8870 using WLED"
    + depends on BACKLIGHT_CLASS_DEVICE && I2C
    + select NEW_LEDS
    + select LEDS_CLASS
    + help
    + If you have a LCD backlight connected to the ADP8870,
    + say Y here to enable this driver.
    +
    + To compile this driver as a module, choose M here: the module will
    + be called adp8870_bl.
    +
    config BACKLIGHT_88PM860X
    tristate "Backlight Driver for 88PM8606 using WLED"
    depends on MFD_88PM860X
    diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
    index 44c0f81..25aa643 100644
    --- a/drivers/video/backlight/Makefile
    +++ b/drivers/video/backlight/Makefile
    @@ -33,6 +33,7 @@ obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o
    obj-$(CONFIG_BACKLIGHT_ADX) += adx_bl.o
    obj-$(CONFIG_BACKLIGHT_ADP5520) += adp5520_bl.o
    obj-$(CONFIG_BACKLIGHT_ADP8860) += adp8860_bl.o
    +obj-$(CONFIG_BACKLIGHT_ADP8870) += adp8870_bl.o
    obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
    obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o

    diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
    new file mode 100644
    index 0000000..9a01c6c
    --- /dev/null
    +++ b/drivers/video/backlight/adp8870_bl.c
    @@ -0,0 +1,917 @@
    +/*
    + * Backlight driver for Analog Devices ADP8870 Backlight Devices
    + *
    + * Copyright 2009-2010 Analog Devices Inc.
    + *
    + * Licensed under the GPL-2 or later.
    + */
    +
    +#include <linux/module.h>
    +#include <linux/version.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/workqueue.h>
    +#include <linux/slab.h>
    +
    +#include <linux/i2c/adp8870.h>
    +#define ADP8870_EXT_FEATURES
    +#define ADP8870_USE_LEDS
    +
    +
    +#define ADP8870_MFDVID 0x00 /* Manufacturer and device ID */
    +#define ADP8870_MDCR 0x01 /* Device mode and status */
    +#define ADP8870_INT_STAT 0x02 /* Interrupts status */
    +#define ADP8870_INT_EN 0x03 /* Interrupts enable */
    +#define ADP8870_CFGR 0x04 /* Configuration register */
    +#define ADP8870_BLSEL 0x05 /* Sink enable backlight or independent */
    +#define ADP8870_PWMLED 0x06 /* PWM Enable Selection Register */
    +#define ADP8870_BLOFF 0x07 /* Backlight off timeout */
    +#define ADP8870_BLDIM 0x08 /* Backlight dim timeout */
    +#define ADP8870_BLFR 0x09 /* Backlight fade in and out rates */
    +#define ADP8870_BLMX1 0x0A /* Backlight (Brightness Level 1-daylight) maximum current */
    +#define ADP8870_BLDM1 0x0B /* Backlight (Brightness Level 1-daylight) dim current */
    +#define ADP8870_BLMX2 0x0C /* Backlight (Brightness Level 2-bright) maximum current */
    +#define ADP8870_BLDM2 0x0D /* Backlight (Brightness Level 2-bright) dim current */
    +#define ADP8870_BLMX3 0x0E /* Backlight (Brightness Level 3-office) maximum current */
    +#define ADP8870_BLDM3 0x0F /* Backlight (Brightness Level 3-office) dim current */
    +#define ADP8870_BLMX4 0x10 /* Backlight (Brightness Level 4-indoor) maximum current */
    +#define ADP8870_BLDM4 0x11 /* Backlight (Brightness Level 4-indoor) dim current */
    +#define ADP8870_BLMX5 0x12 /* Backlight (Brightness Level 5-dark) maximum current */
    +#define ADP8870_BLDM5 0x13 /* Backlight (Brightness Level 5-dark) dim current */
    +#define ADP8870_ISCLAW 0x1A /* Independent sink current fade law register */
    +#define ADP8870_ISCC 0x1B /* Independent sink current control register */
    +#define ADP8870_ISCT1 0x1C /* Independent Sink Current Timer Register LED[7:5] */
    +#define ADP8870_ISCT2 0x1D /* Independent Sink Current Timer Register LED[4:1] */
    +#define ADP8870_ISCF 0x1E /* Independent sink current fade register */
    +#define ADP8870_ISC1 0x1F /* Independent Sink Current LED1 */
    +#define ADP8870_ISC2 0x20 /* Independent Sink Current LED2 */
    +#define ADP8870_ISC3 0x21 /* Independent Sink Current LED3 */
    +#define ADP8870_ISC4 0x22 /* Independent Sink Current LED4 */
    +#define ADP8870_ISC5 0x23 /* Independent Sink Current LED5 */
    +#define ADP8870_ISC6 0x24 /* Independent Sink Current LED6 */
    +#define ADP8870_ISC7 0x25 /* Independent Sink Current LED7 (Brightness Level 1-daylight) */
    +#define ADP8870_ISC7_L2 0x26 /* Independent Sink Current LED7 (Brightness Level 2-bright) */
    +#define ADP8870_ISC7_L3 0x27 /* Independent Sink Current LED7 (Brightness Level 3-office) */
    +#define ADP8870_ISC7_L4 0x28 /* Independent Sink Current LED7 (Brightness Level 4-indoor) */
    +#define ADP8870_ISC7_L5 0x29 /* Independent Sink Current LED7 (Brightness Level 5-dark) */
    +#define ADP8870_CMP_CTL 0x2D /* ALS Comparator Control Register */
    +#define ADP8870_ALS1_EN 0x2E /* Main ALS comparator level enable */
    +#define ADP8870_ALS2_EN 0x2F /* Second ALS comparator level enable */
    +#define ADP8870_ALS1_STAT 0x30 /* Main ALS Comparator Status Register */
    +#define ADP8870_ALS2_STAT 0x31 /* Second ALS Comparator Status Register */
    +#define ADP8870_L2TRP 0x32 /* L2 comparator reference */
    +#define ADP8870_L2HYS 0x33 /* L2 hysteresis */
    +#define ADP8870_L3TRP 0x34 /* L3 comparator reference */
    +#define ADP8870_L3HYS 0x35 /* L3 hysteresis */
    +#define ADP8870_L4TRP 0x36 /* L4 comparator reference */
    +#define ADP8870_L4HYS 0x37 /* L4 hysteresis */
    +#define ADP8870_L5TRP 0x38 /* L5 comparator reference */
    +#define ADP8870_L5HYS 0x39 /* L5 hysteresis */
    +#define ADP8870_PH1LEVL 0x40 /* First phototransistor ambient light level-low byte register */
    +#define ADP8870_PH1LEVH 0x41 /* First phototransistor ambient light level-high byte register */
    +#define ADP8870_PH2LEVL 0x42 /* Second phototransistor ambient light level-low byte register */
    +#define ADP8870_PH2LEVH 0x43 /* Second phototransistor ambient light level-high byte register */
    +
    +#define ADP8870_MANUFID 0x3 /* Analog Devices AD8870 Manufacturer and device ID */
    +#define ADP8870_DEVID(x) ((x) & 0xF)
    +#define ADP8870_MANID(x) ((x) >> 4)
    +
    +/* MDCR Device mode and status */
    +#define D7ALSEN (1 << 7)
    +#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)
    +
    +/* ADP8870_ALS1_EN Main ALS comparator level enable */
    +#define L5_EN (1 << 3)
    +#define L4_EN (1 << 2)
    +#define L3_EN (1 << 1)
    +#define L2_EN (1 << 0)
    +
    +#define CFGR_BLV_SHIFT 3
    +#define CFGR_BLV_MASK 0x7
    +#define ADP8870_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_CMPR_CFG_VAL(filt) ((0x7 & filt) << 1)
    +
    +struct adp8870_bl {
    + struct i2c_client *client;
    + struct backlight_device *bl;
    + struct adp8870_led *led;
    + struct adp8870_backlight_platform_data *pdata;
    + struct mutex lock;
    + unsigned long cached_daylight_max;
    + int id;
    + int revid;
    + int current_brightness;
    +};
    +
    +struct adp8870_led {
    + struct led_classdev cdev;
    + struct work_struct work;
    + struct i2c_client *client;
    + enum led_brightness new_brightness;
    + int id;
    + int flags;
    +};
    +
    +static int adp8870_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 adp8870_write(struct i2c_client *client, u8 reg, u8 val)
    +{
    + return i2c_smbus_write_byte_data(client, reg, val);
    +}
    +
    +static int adp8870_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
    +{
    + struct adp8870_bl *data = i2c_get_clientdata(client);
    + uint8_t reg_val;
    + int ret;
    +
    + mutex_lock(&data->lock);
    +
    + ret = adp8870_read(client, reg, &reg_val);
    +
    + if (!ret && ((reg_val & bit_mask) == 0)) {
    + reg_val |= bit_mask;
    + ret = adp8870_write(client, reg, reg_val);
    + }
    +
    + mutex_unlock(&data->lock);
    + return ret;
    +}
    +
    +static int adp8870_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
    +{
    + struct adp8870_bl *data = i2c_get_clientdata(client);
    + uint8_t reg_val;
    + int ret;
    +
    + mutex_lock(&data->lock);
    +
    + ret = adp8870_read(client, reg, &reg_val);
    +
    + if (!ret && (reg_val & bit_mask)) {
    + reg_val &= ~bit_mask;
    + ret = adp8870_write(client, reg, reg_val);
    + }
    +
    + mutex_unlock(&data->lock);
    + return ret;
    +}
    +
    +/*
    + * Independent sink / LED
    + */
    +#if defined(ADP8870_USE_LEDS)
    +static void adp8870_led_work(struct work_struct *work)
    +{
    + struct adp8870_led *led = container_of(work, struct adp8870_led, work);
    + adp8870_write(led->client, ADP8870_ISC1 + led->id - 1,
    + led->new_brightness >> 1);
    +}
    +
    +static void adp8870_led_set(struct led_classdev *led_cdev,
    + enum led_brightness value)
    +{
    + struct adp8870_led *led;
    +
    + led = container_of(led_cdev, struct adp8870_led, cdev);
    + led->new_brightness = value;
    + schedule_work(&led->work);
    +}
    +
    +static int adp8870_led_setup(struct adp8870_led *led)
    +{
    + struct i2c_client *client = led->client;
    + int ret = 0;
    +
    + ret = adp8870_write(client, ADP8870_ISC1 + led->id - 1, 0);
    + ret |= adp8870_set_bits(client, ADP8870_ISCC, 1 << (led->id - 1));
    +
    + if (led->id > 4)
    + ret |= adp8870_set_bits(client, ADP8870_ISCT1,
    + (led->flags & 0x3) << ((led->id - 5) * 2));
    + else
    + ret |= adp8870_set_bits(client, ADP8870_ISCT2,
    + (led->flags & 0x3) << ((led->id - 1) * 2));
    +
    + return ret;
    +}
    +
    +static int __devinit adp8870_led_probe(struct i2c_client *client)
    +{
    + struct adp8870_backlight_platform_data *pdata =
    + client->dev.platform_data;
    + struct adp8870_bl *data = i2c_get_clientdata(client);
    + struct adp8870_led *led, *led_dat;
    + struct led_info *cur_led;
    + int ret, i;
    +
    + led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL);
    + if (led == NULL) {
    + dev_err(&client->dev, "failed to alloc memory\n");
    + return -ENOMEM;
    + }
    +
    + ret = adp8870_write(client, ADP8870_ISCLAW, pdata->led_fade_law);
    + ret = adp8870_write(client, ADP8870_ISCT1,
    + (pdata->led_on_time & 0x3) << 6);
    + ret |= adp8870_write(client, ADP8870_ISCF,
    + FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
    +
    + if (ret) {
    + dev_err(&client->dev, "failed to write\n");
    + goto err_free;
    + }
    +
    + for (i = 0; i < pdata->num_leds; ++i) {
    + cur_led = &pdata->leds[i];
    + led_dat = &led[i];
    +
    + led_dat->id = cur_led->flags & ADP8870_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 = adp8870_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, adp8870_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 = adp8870_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);
    + }
    +
    + err_free:
    + kfree(led);
    +
    + return ret;
    +}
    +
    +static int __devexit adp8870_led_remove(struct i2c_client *client)
    +{
    + struct adp8870_backlight_platform_data *pdata =
    + client->dev.platform_data;
    + struct adp8870_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);
    + }
    +
    + kfree(data->led);
    + return 0;
    +}
    +#else
    +static int __devinit adp8870_led_probe(struct i2c_client *client)
    +{
    + return 0;
    +}
    +
    +static int __devexit adp8870_led_remove(struct i2c_client *client)
    +{
    + return 0;
    +}
    +#endif
    +
    +static int adp8870_bl_set(struct backlight_device *bl, int brightness)
    +{
    + struct adp8870_bl *data = bl_get_data(bl);
    + struct i2c_client *client = data->client;
    + int ret = 0;
    +
    + if (data->pdata->en_ambl_sens) {
    + if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) {
    + /* Disable Ambient Light auto adjust */
    + ret |= adp8870_clr_bits(client, ADP8870_MDCR,
    + CMP_AUTOEN);
    + ret |= adp8870_write(client, ADP8870_BLMX1, brightness);
    + } else {
    + /*
    + * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
    + * restore daylight l1 sysfs brightness
    + */
    + ret |= adp8870_write(client, ADP8870_BLMX1,
    + data->cached_daylight_max);
    + ret |= adp8870_set_bits(client, ADP8870_MDCR,
    + CMP_AUTOEN);
    + }
    + } else
    + ret |= adp8870_write(client, ADP8870_BLMX1, brightness);
    +
    + if (data->current_brightness && brightness == 0)
    + ret |= adp8870_set_bits(client,
    + ADP8870_MDCR, DIM_EN);
    + else if (data->current_brightness == 0 && brightness)
    + ret |= adp8870_clr_bits(client,
    + ADP8870_MDCR, DIM_EN);
    +
    + if (!ret)
    + data->current_brightness = brightness;
    +
    + return ret;
    +}
    +
    +static int adp8870_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 adp8870_bl_set(bl, brightness);
    +}
    +
    +static int adp8870_bl_get_brightness(struct backlight_device *bl)
    +{
    + struct adp8870_bl *data = bl_get_data(bl);
    +
    + return data->current_brightness;
    +}
    +
    +static const struct backlight_ops adp8870_bl_ops = {
    + .update_status = adp8870_bl_update_status,
    + .get_brightness = adp8870_bl_get_brightness,
    +};
    +
    +static int adp8870_bl_setup(struct backlight_device *bl)
    +{
    + struct adp8870_bl *data = bl_get_data(bl);
    + struct i2c_client *client = data->client;
    + struct adp8870_backlight_platform_data *pdata = data->pdata;
    + int ret = 0;
    +
    + ret |= adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign);
    + ret |= adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign);
    + ret |= adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max);
    + ret |= adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim);
    +
    + if (pdata->en_ambl_sens) {
    + data->cached_daylight_max = pdata->l1_daylight_max;
    + ret |= adp8870_write(client, ADP8870_BLMX2,
    + pdata->l2_bright_max);
    + ret |= adp8870_write(client, ADP8870_BLDM2,
    + pdata->l2_bright_dim);
    + ret |= adp8870_write(client, ADP8870_BLMX3,
    + pdata->l3_office_max);
    + ret |= adp8870_write(client, ADP8870_BLDM3,
    + pdata->l3_office_dim);
    + ret |= adp8870_write(client, ADP8870_BLMX4,
    + pdata->l4_indoor_max);
    + ret |= adp8870_write(client, ADP8870_BLDM4,
    + pdata->l4_indor_dim);
    + ret |= adp8870_write(client, ADP8870_BLMX5,
    + pdata->l5_dark_max);
    + ret |= adp8870_write(client, ADP8870_BLDM5,
    + pdata->l5_dark_dim);
    +
    + ret |= adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip);
    + ret |= adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst);
    + ret |= adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip);
    + ret |= adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst);
    + ret |= adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip);
    + ret |= adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst);
    + ret |= adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip);
    + ret |= adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst);
    + ret |= adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN |
    + L3_EN | L2_EN);
    +
    + ret |= adp8870_write(client, ADP8870_CMP_CTL,
    + ALS_CMPR_CFG_VAL(pdata->abml_filt));
    +
    + }
    +
    + ret |= adp8870_write(client, ADP8870_CFGR,
    + BL_CFGR_VAL(pdata->bl_fade_law, 0));
    +
    + ret |= adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in,
    + pdata->bl_fade_out));
    +
    + /*
    + * ADP8870 Rev0 requires GDWN_DIS bit set
    + */
    +
    + ret |= adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY |
    + (data->revid == 0 ? GDWN_DIS : 0));
    +
    + return ret;
    +}
    +
    +static ssize_t adp8870_show(struct device *dev, char *buf, int reg)
    +{
    + struct adp8870_bl *data = dev_get_drvdata(dev);
    + int error;
    + uint8_t reg_val;
    +
    + mutex_lock(&data->lock);
    + error = adp8870_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 adp8870_store(struct device *dev, const char *buf,
    + size_t count, int reg)
    +{
    + struct adp8870_bl *data = dev_get_drvdata(dev);
    + unsigned long val;
    + int ret;
    +
    + ret = strict_strtoul(buf, 10, &val);
    + if (ret)
    + return ret;
    +
    + mutex_lock(&data->lock);
    + adp8870_write(data->client, reg, val);
    + mutex_unlock(&data->lock);
    +
    + return count;
    +}
    +
    +static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return adp8870_show(dev, buf, ADP8870_BLMX5);
    +}
    +
    +static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev,
    + struct device_attribute *attr, const char *buf, size_t count)
    +{
    + return adp8870_store(dev, buf, count, ADP8870_BLMX5);
    +}
    +static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show,
    + adp8870_bl_l5_dark_max_store);
    +
    +
    +static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return adp8870_show(dev, buf, ADP8870_BLMX4);
    +}
    +
    +static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev,
    + struct device_attribute *attr, const char *buf, size_t count)
    +{
    + return adp8870_store(dev, buf, count, ADP8870_BLMX4);
    +}
    +static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show,
    + adp8870_bl_l4_indoor_max_store);
    +
    +
    +static ssize_t adp8870_bl_l3_office_max_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return adp8870_show(dev, buf, ADP8870_BLMX3);
    +}
    +
    +static ssize_t adp8870_bl_l3_office_max_store(struct device *dev,
    + struct device_attribute *attr, const char *buf, size_t count)
    +{
    + return adp8870_store(dev, buf, count, ADP8870_BLMX3);
    +}
    +
    +static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show,
    + adp8870_bl_l3_office_max_store);
    +
    +static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return adp8870_show(dev, buf, ADP8870_BLMX2);
    +}
    +
    +static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev,
    + struct device_attribute *attr, const char *buf, size_t count)
    +{
    + return adp8870_store(dev, buf, count, ADP8870_BLMX2);
    +}
    +static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show,
    + adp8870_bl_l2_bright_max_store);
    +
    +static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return adp8870_show(dev, buf, ADP8870_BLMX1);
    +}
    +
    +static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev,
    + struct device_attribute *attr, const char *buf, size_t count)
    +{
    + struct adp8870_bl *data = dev_get_drvdata(dev);
    + int ret = strict_strtoul(buf, 10, &data->cached_daylight_max);
    + if (ret)
    + return ret;
    +
    + return adp8870_store(dev, buf, count, ADP8870_BLMX1);
    +}
    +static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show,
    + adp8870_bl_l1_daylight_max_store);
    +
    +static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return adp8870_show(dev, buf, ADP8870_BLDM5);
    +}
    +
    +static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + return adp8870_store(dev, buf, count, ADP8870_BLDM5);
    +}
    +static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show,
    + adp8870_bl_l5_dark_dim_store);
    +
    +static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return adp8870_show(dev, buf, ADP8870_BLDM4);
    +}
    +
    +static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + return adp8870_store(dev, buf, count, ADP8870_BLDM4);
    +}
    +static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show,
    + adp8870_bl_l4_indoor_dim_store);
    +
    +
    +static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return adp8870_show(dev, buf, ADP8870_BLDM3);
    +}
    +
    +static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + return adp8870_store(dev, buf, count, ADP8870_BLDM3);
    +}
    +static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show,
    + adp8870_bl_l3_office_dim_store);
    +
    +static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return adp8870_show(dev, buf, ADP8870_BLDM2);
    +}
    +
    +static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + return adp8870_store(dev, buf, count, ADP8870_BLDM2);
    +}
    +static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show,
    + adp8870_bl_l2_bright_dim_store);
    +
    +static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + return adp8870_show(dev, buf, ADP8870_BLDM1);
    +}
    +
    +static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + return adp8870_store(dev, buf, count, ADP8870_BLDM1);
    +}
    +static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show,
    + adp8870_bl_l1_daylight_dim_store);
    +
    +#ifdef ADP8870_EXT_FEATURES
    +static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct adp8870_bl *data = dev_get_drvdata(dev);
    + int error;
    + uint8_t reg_val;
    + uint16_t ret_val;
    +
    + mutex_lock(&data->lock);
    + error = adp8870_read(data->client, ADP8870_PH1LEVL, &reg_val);
    + ret_val = reg_val;
    + error |= adp8870_read(data->client, ADP8870_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,
    + adp8870_bl_ambient_light_level_show, NULL);
    +
    +static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct adp8870_bl *data = dev_get_drvdata(dev);
    + int error;
    + uint8_t reg_val;
    +
    + mutex_lock(&data->lock);
    + error = adp8870_read(data->client, ADP8870_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 adp8870_bl_ambient_light_zone_store(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + struct adp8870_bl *data = dev_get_drvdata(dev);
    + unsigned long val;
    + uint8_t reg_val;
    + int ret;
    +
    + ret = strict_strtoul(buf, 10, &val);
    + if (ret)
    + return ret;
    +
    + if (val == 0) {
    + /* Enable automatic ambient light sensing */
    + adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
    + } else if ((val > 0) && (val < 6)) {
    + /* Disable automatic ambient light sensing */
    + adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
    +
    + /* Set user supplied ambient light zone */
    + mutex_lock(&data->lock);
    + adp8870_read(data->client, ADP8870_CFGR, &reg_val);
    + reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
    + reg_val |= (val - 1) << CFGR_BLV_SHIFT;
    + adp8870_write(data->client, ADP8870_CFGR, reg_val);
    + mutex_unlock(&data->lock);
    + }
    +
    + return count;
    +}
    +static DEVICE_ATTR(ambient_light_zone, 0664,
    + adp8870_bl_ambient_light_zone_show,
    + adp8870_bl_ambient_light_zone_store);
    +#endif
    +
    +static struct attribute *adp8870_bl_attributes[] = {
    + &dev_attr_l5_dark_max.attr,
    + &dev_attr_l5_dark_dim.attr,
    + &dev_attr_l4_indoor_max.attr,
    + &dev_attr_l4_indoor_dim.attr,
    + &dev_attr_l3_office_max.attr,
    + &dev_attr_l3_office_dim.attr,
    + &dev_attr_l2_bright_max.attr,
    + &dev_attr_l2_bright_dim.attr,
    + &dev_attr_l1_daylight_max.attr,
    + &dev_attr_l1_daylight_dim.attr,
    +#ifdef ADP8870_EXT_FEATURES
    + &dev_attr_ambient_light_level.attr,
    + &dev_attr_ambient_light_zone.attr,
    +#endif
    + NULL
    +};
    +
    +static const struct attribute_group adp8870_bl_attr_group = {
    + .attrs = adp8870_bl_attributes,
    +};
    +
    +static int __devinit adp8870_probe(struct i2c_client *client,
    + const struct i2c_device_id *id)
    +{
    + struct backlight_properties props;
    + struct backlight_device *bl;
    + struct adp8870_bl *data;
    + struct adp8870_backlight_platform_data *pdata =
    + client->dev.platform_data;
    + 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;
    + }
    +
    + ret = adp8870_read(client, ADP8870_MFDVID, &reg_val);
    + if (ret < 0)
    + return -EIO;
    +
    + if (ADP8870_MANID(reg_val) != ADP8870_MANUFID) {
    + dev_err(&client->dev, "failed to probe\n");
    + return -ENODEV;
    + }
    +
    + data = kzalloc(sizeof(*data), GFP_KERNEL);
    + if (data == NULL)
    + return -ENOMEM;
    +
    + data->revid = ADP8870_DEVID(reg_val);
    + data->client = client;
    + data->pdata = pdata;
    + data->id = id->driver_data;
    + data->current_brightness = 0;
    + i2c_set_clientdata(client, data);
    +
    + mutex_init(&data->lock);
    +
    + memset(&props, 0, sizeof(props));
    + props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS;
    + bl = backlight_device_register(dev_driver_string(&client->dev),
    + &client->dev, data, &adp8870_bl_ops, &props);
    + if (IS_ERR(bl)) {
    + dev_err(&client->dev, "failed to register backlight\n");
    + ret = PTR_ERR(bl);
    + goto out2;
    + }
    +
    + data->bl = bl;
    +
    + if (pdata->en_ambl_sens)
    + ret = sysfs_create_group(&bl->dev.kobj,
    + &adp8870_bl_attr_group);
    +
    + if (ret) {
    + dev_err(&client->dev, "failed to register sysfs\n");
    + goto out1;
    + }
    +
    + ret = adp8870_bl_setup(bl);
    + if (ret) {
    + ret = -EIO;
    + goto out;
    + }
    +
    + backlight_update_status(bl);
    +
    + dev_info(&client->dev, "Rev.%d Backlight\n", data->revid);
    +
    + if (pdata->num_leds)
    + adp8870_led_probe(client);
    +
    + return 0;
    +
    +out:
    + if (data->pdata->en_ambl_sens)
    + sysfs_remove_group(&data->bl->dev.kobj,
    + &adp8870_bl_attr_group);
    +out1:
    + backlight_device_unregister(bl);
    +out2:
    + i2c_set_clientdata(client, NULL);
    + kfree(data);
    +
    + return ret;
    +}
    +
    +static int __devexit adp8870_remove(struct i2c_client *client)
    +{
    + struct adp8870_bl *data = i2c_get_clientdata(client);
    +
    + adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
    +
    + if (data->led)
    + adp8870_led_remove(client);
    +
    + if (data->pdata->en_ambl_sens)
    + sysfs_remove_group(&data->bl->dev.kobj,
    + &adp8870_bl_attr_group);
    +
    + backlight_device_unregister(data->bl);
    + i2c_set_clientdata(client, NULL);
    + kfree(data);
    +
    + return 0;
    +}
    +
    +#ifdef CONFIG_PM
    +static int adp8870_i2c_suspend(struct i2c_client *client, pm_message_t message)
    +{
    + adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
    +
    + return 0;
    +}
    +
    +static int adp8870_i2c_resume(struct i2c_client *client)
    +{
    + adp8870_set_bits(client, ADP8870_MDCR, NSTBY);
    +
    + return 0;
    +}
    +#else
    +#define adp8870_i2c_suspend NULL
    +#define adp8870_i2c_resume NULL
    +#endif
    +
    +static const struct i2c_device_id adp8870_id[] = {
    + { "adp8870", 0 },
    + { }
    +};
    +MODULE_DEVICE_TABLE(i2c, adp8870_id);
    +
    +static struct i2c_driver adp8870_driver = {
    + .driver = {
    + .name = KBUILD_MODNAME,
    + },
    + .probe = adp8870_probe,
    + .remove = __devexit_p(adp8870_remove),
    + .suspend = adp8870_i2c_suspend,
    + .resume = adp8870_i2c_resume,
    + .id_table = adp8870_id,
    +};
    +
    +static int __init adp8870_init(void)
    +{
    + return i2c_add_driver(&adp8870_driver);
    +}
    +module_init(adp8870_init);
    +
    +static void __exit adp8870_exit(void)
    +{
    + i2c_del_driver(&adp8870_driver);
    +}
    +module_exit(adp8870_exit);
    +
    +MODULE_LICENSE("GPL v2");
    +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
    +MODULE_DESCRIPTION("ADP8870 Backlight driver");
    +MODULE_ALIAS("platform:adp8870-backlight");
    diff --git a/include/linux/i2c/adp8870.h b/include/linux/i2c/adp8870.h
    new file mode 100644
    index 0000000..624dcec
    --- /dev/null
    +++ b/include/linux/i2c/adp8870.h
    @@ -0,0 +1,153 @@
    +/*
    + * Definitions and platform data for Analog Devices
    + * Backlight drivers ADP8870
    + *
    + * Copyright 2009-2010 Analog Devices Inc.
    + *
    + * Licensed under the GPL-2 or later.
    + */
    +
    +#ifndef __LINUX_I2C_ADP8870_H
    +#define __LINUX_I2C_ADP8870_H
    +
    +#define ID_ADP8870 8870
    +
    +#define ADP8870_MAX_BRIGHTNESS 0x7F
    +#define FLAG_OFFT_SHIFT 8
    +
    +/*
    + * LEDs subdevice platform data
    + */
    +
    +#define ADP8870_LED_DIS_BLINK (0 << FLAG_OFFT_SHIFT)
    +#define ADP8870_LED_OFFT_600ms (1 << FLAG_OFFT_SHIFT)
    +#define ADP8870_LED_OFFT_1200ms (2 << FLAG_OFFT_SHIFT)
    +#define ADP8870_LED_OFFT_1800ms (3 << FLAG_OFFT_SHIFT)
    +
    +#define ADP8870_LED_ONT_200ms 0
    +#define ADP8870_LED_ONT_600ms 1
    +#define ADP8870_LED_ONT_800ms 2
    +#define ADP8870_LED_ONT_1200ms 3
    +
    +#define ADP8870_LED_D7 (7)
    +#define ADP8870_LED_D6 (6)
    +#define ADP8870_LED_D5 (5)
    +#define ADP8870_LED_D4 (4)
    +#define ADP8870_LED_D3 (3)
    +#define ADP8870_LED_D2 (2)
    +#define ADP8870_LED_D1 (1)
    +
    +/*
    + * Backlight subdevice platform data
    + */
    +
    +#define ADP8870_BL_D7 (1 << 6)
    +#define ADP8870_BL_D6 (1 << 5)
    +#define ADP8870_BL_D5 (1 << 4)
    +#define ADP8870_BL_D4 (1 << 3)
    +#define ADP8870_BL_D3 (1 << 2)
    +#define ADP8870_BL_D2 (1 << 1)
    +#define ADP8870_BL_D1 (1 << 0)
    +
    +#define ADP8870_FADE_T_DIS 0 /* Fade Timer Disabled */
    +#define ADP8870_FADE_T_300ms 1 /* 0.3 Sec */
    +#define ADP8870_FADE_T_600ms 2
    +#define ADP8870_FADE_T_900ms 3
    +#define ADP8870_FADE_T_1200ms 4
    +#define ADP8870_FADE_T_1500ms 5
    +#define ADP8870_FADE_T_1800ms 6
    +#define ADP8870_FADE_T_2100ms 7
    +#define ADP8870_FADE_T_2400ms 8
    +#define ADP8870_FADE_T_2700ms 9
    +#define ADP8870_FADE_T_3000ms 10
    +#define ADP8870_FADE_T_3500ms 11
    +#define ADP8870_FADE_T_4000ms 12
    +#define ADP8870_FADE_T_4500ms 13
    +#define ADP8870_FADE_T_5000ms 14
    +#define ADP8870_FADE_T_5500ms 15 /* 5.5 Sec */
    +
    +#define ADP8870_FADE_LAW_LINEAR 0
    +#define ADP8870_FADE_LAW_SQUARE 1
    +#define ADP8870_FADE_LAW_CUBIC1 2
    +#define ADP8870_FADE_LAW_CUBIC2 3
    +
    +#define ADP8870_BL_AMBL_FILT_80ms 0 /* Light sensor filter time */
    +#define ADP8870_BL_AMBL_FILT_160ms 1
    +#define ADP8870_BL_AMBL_FILT_320ms 2
    +#define ADP8870_BL_AMBL_FILT_640ms 3
    +#define ADP8870_BL_AMBL_FILT_1280ms 4
    +#define ADP8870_BL_AMBL_FILT_2560ms 5
    +#define ADP8870_BL_AMBL_FILT_5120ms 6
    +#define ADP8870_BL_AMBL_FILT_10240ms 7 /* 10.24 sec */
    +
    +/*
    + * Blacklight current 0..30mA
    + */
    +#define ADP8870_BL_CUR_mA(I) ((I * 127) / 30)
    +
    +/*
    + * L2 comparator current 0..1106uA
    + */
    +#define ADP8870_L2_COMP_CURR_uA(I) ((I * 255) / 1106)
    +
    +/*
    + * L3 comparator current 0..551uA
    + */
    +#define ADP8870_L3_COMP_CURR_uA(I) ((I * 255) / 551)
    +
    +/*
    + * L4 comparator current 0..275uA
    + */
    +#define ADP8870_L4_COMP_CURR_uA(I) ((I * 255) / 275)
    +
    +/*
    + * L5 comparator current 0..138uA
    + */
    +#define ADP8870_L5_COMP_CURR_uA(I) ((I * 255) / 138)
    +
    +struct adp8870_backlight_platform_data {
    + u8 bl_led_assign; /* 1 = Backlight 0 = Individual LED */
    + u8 pwm_assign; /* 1 = Enables PWM mode */
    +
    + u8 bl_fade_in; /* Backlight Fade-In Timer */
    + u8 bl_fade_out; /* Backlight Fade-Out Timer */
    + u8 bl_fade_law; /* fade-on/fade-off transfer characteristic */
    +
    + u8 en_ambl_sens; /* 1 = enable ambient light sensor */
    + u8 abml_filt; /* Light sensor filter time */
    +
    + u8 l1_daylight_max; /* use BL_CUR_mA(I) 0 <= I <= 30 mA */
    + u8 l1_daylight_dim; /* typ = 0, use BL_CUR_mA(I) 0 <= I <= 30 mA */
    + u8 l2_bright_max; /* use BL_CUR_mA(I) 0 <= I <= 30 mA */
    + u8 l2_bright_dim; /* typ = 0, use BL_CUR_mA(I) 0 <= I <= 30 mA */
    + u8 l3_office_max; /* use BL_CUR_mA(I) 0 <= I <= 30 mA */
    + u8 l3_office_dim; /* typ = 0, use BL_CUR_mA(I) 0 <= I <= 30 mA */
    + u8 l4_indoor_max; /* use BL_CUR_mA(I) 0 <= I <= 30 mA */
    + u8 l4_indor_dim; /* typ = 0, use BL_CUR_mA(I) 0 <= I <= 30 mA */
    + u8 l5_dark_max; /* use BL_CUR_mA(I) 0 <= I <= 30 mA */
    + u8 l5_dark_dim; /* typ = 0, use BL_CUR_mA(I) 0 <= I <= 30 mA */
    +
    + u8 l2_trip; /* use L2_COMP_CURR_uA(I) 0 <= I <= 1106 uA */
    + u8 l2_hyst; /* use L2_COMP_CURR_uA(I) 0 <= I <= 1106 uA */
    + u8 l3_trip; /* use L3_COMP_CURR_uA(I) 0 <= I <= 551 uA */
    + u8 l3_hyst; /* use L3_COMP_CURR_uA(I) 0 <= I <= 551 uA */
    + u8 l4_trip; /* use L4_COMP_CURR_uA(I) 0 <= I <= 275 uA */
    + u8 l4_hyst; /* use L4_COMP_CURR_uA(I) 0 <= I <= 275 uA */
    + u8 l5_trip; /* use L5_COMP_CURR_uA(I) 0 <= I <= 138 uA */
    + u8 l5_hyst; /* use L6_COMP_CURR_uA(I) 0 <= I <= 138 uA */
    +
    + /**
    + * Independent Current Sinks / LEDS
    + * Sinks not assigned to the Backlight can be exposed to
    + * user space using the LEDS CLASS interface
    + */
    +
    + int num_leds;
    + struct led_info *leds;
    + u8 led_fade_in; /* LED Fade-In Timer */
    + u8 led_fade_out; /* LED Fade-Out Timer */
    + u8 led_fade_law; /* fade-on/fade-off transfer characteristic */
    + u8 led_on_time;
    +};
    +
    +#endif /* __LINUX_I2C_ADP8870_H */
    --
    1.7.4.rc1


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