--- /dev/null
+/*
+ * 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, ®_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, ®_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 adp8860_led_probe(struct i2c_client *client)
+{
+ struct adp8860_backlight_platform_data *pdata =
+ dev_get_platdata(&client->dev);
+ 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)
+ 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);
+ ret = -EINVAL;
+ 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);
+ ret = -EBUSY;
+ 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 adp8860_led_remove(struct i2c_client *client)
+{
+ struct adp8860_backlight_platform_data *pdata =
+ dev_get_platdata(&client->dev);
+ 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 adp8860_led_probe(struct i2c_client *client)
+{
+ return 0;
+}
+
+static int 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, ®_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, ®_val);
+ ret_val = reg_val;
+ error |= adp8860_read(data->client, ADP8860_PH1LEVH, ®_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, ®_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, ®_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 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 =
+ dev_get_platdata(&client->dev);
+ 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, ®_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 = devm_backlight_device_register(&client->dev,
+ 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");
+ return ret;
+ }
+
+ 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);
+
+ return ret;
+}
+
+static int 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);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int adp8860_i2c_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);
+
+ return 0;
+}
+
+static int adp8860_i2c_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ adp8860_set_bits(client, ADP8860_MDCR, NSTBY | BLEN);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(adp8860_i2c_pm_ops, adp8860_i2c_suspend,
+ adp8860_i2c_resume);
+
+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,
+ .pm = &adp8860_i2c_pm_ops,
+ },
+ .probe = adp8860_probe,
+ .remove = adp8860_remove,
+ .id_table = adp8860_id,
+};
+
+module_i2c_driver(adp8860_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("ADP8860 Backlight driver");
+MODULE_ALIAS("i2c:adp8860-backlight");
Code Review / kvmfornfv.git / blobdiff