2 * Backlight driver for Analog Devices ADP8870 Backlight Devices
4 * Copyright 2009-2011 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/errno.h>
13 #include <linux/platform_device.h>
14 #include <linux/i2c.h>
16 #include <linux/backlight.h>
17 #include <linux/leds.h>
18 #include <linux/workqueue.h>
19 #include <linux/slab.h>
21 #include <linux/i2c/adp8870.h>
22 #define ADP8870_EXT_FEATURES
23 #define ADP8870_USE_LEDS
26 #define ADP8870_MFDVID 0x00 /* Manufacturer and device ID */
27 #define ADP8870_MDCR 0x01 /* Device mode and status */
28 #define ADP8870_INT_STAT 0x02 /* Interrupts status */
29 #define ADP8870_INT_EN 0x03 /* Interrupts enable */
30 #define ADP8870_CFGR 0x04 /* Configuration register */
31 #define ADP8870_BLSEL 0x05 /* Sink enable backlight or independent */
32 #define ADP8870_PWMLED 0x06 /* PWM Enable Selection Register */
33 #define ADP8870_BLOFF 0x07 /* Backlight off timeout */
34 #define ADP8870_BLDIM 0x08 /* Backlight dim timeout */
35 #define ADP8870_BLFR 0x09 /* Backlight fade in and out rates */
36 #define ADP8870_BLMX1 0x0A /* Backlight (Brightness Level 1-daylight) maximum current */
37 #define ADP8870_BLDM1 0x0B /* Backlight (Brightness Level 1-daylight) dim current */
38 #define ADP8870_BLMX2 0x0C /* Backlight (Brightness Level 2-bright) maximum current */
39 #define ADP8870_BLDM2 0x0D /* Backlight (Brightness Level 2-bright) dim current */
40 #define ADP8870_BLMX3 0x0E /* Backlight (Brightness Level 3-office) maximum current */
41 #define ADP8870_BLDM3 0x0F /* Backlight (Brightness Level 3-office) dim current */
42 #define ADP8870_BLMX4 0x10 /* Backlight (Brightness Level 4-indoor) maximum current */
43 #define ADP8870_BLDM4 0x11 /* Backlight (Brightness Level 4-indoor) dim current */
44 #define ADP8870_BLMX5 0x12 /* Backlight (Brightness Level 5-dark) maximum current */
45 #define ADP8870_BLDM5 0x13 /* Backlight (Brightness Level 5-dark) dim current */
46 #define ADP8870_ISCLAW 0x1A /* Independent sink current fade law register */
47 #define ADP8870_ISCC 0x1B /* Independent sink current control register */
48 #define ADP8870_ISCT1 0x1C /* Independent Sink Current Timer Register LED[7:5] */
49 #define ADP8870_ISCT2 0x1D /* Independent Sink Current Timer Register LED[4:1] */
50 #define ADP8870_ISCF 0x1E /* Independent sink current fade register */
51 #define ADP8870_ISC1 0x1F /* Independent Sink Current LED1 */
52 #define ADP8870_ISC2 0x20 /* Independent Sink Current LED2 */
53 #define ADP8870_ISC3 0x21 /* Independent Sink Current LED3 */
54 #define ADP8870_ISC4 0x22 /* Independent Sink Current LED4 */
55 #define ADP8870_ISC5 0x23 /* Independent Sink Current LED5 */
56 #define ADP8870_ISC6 0x24 /* Independent Sink Current LED6 */
57 #define ADP8870_ISC7 0x25 /* Independent Sink Current LED7 (Brightness Level 1-daylight) */
58 #define ADP8870_ISC7_L2 0x26 /* Independent Sink Current LED7 (Brightness Level 2-bright) */
59 #define ADP8870_ISC7_L3 0x27 /* Independent Sink Current LED7 (Brightness Level 3-office) */
60 #define ADP8870_ISC7_L4 0x28 /* Independent Sink Current LED7 (Brightness Level 4-indoor) */
61 #define ADP8870_ISC7_L5 0x29 /* Independent Sink Current LED7 (Brightness Level 5-dark) */
62 #define ADP8870_CMP_CTL 0x2D /* ALS Comparator Control Register */
63 #define ADP8870_ALS1_EN 0x2E /* Main ALS comparator level enable */
64 #define ADP8870_ALS2_EN 0x2F /* Second ALS comparator level enable */
65 #define ADP8870_ALS1_STAT 0x30 /* Main ALS Comparator Status Register */
66 #define ADP8870_ALS2_STAT 0x31 /* Second ALS Comparator Status Register */
67 #define ADP8870_L2TRP 0x32 /* L2 comparator reference */
68 #define ADP8870_L2HYS 0x33 /* L2 hysteresis */
69 #define ADP8870_L3TRP 0x34 /* L3 comparator reference */
70 #define ADP8870_L3HYS 0x35 /* L3 hysteresis */
71 #define ADP8870_L4TRP 0x36 /* L4 comparator reference */
72 #define ADP8870_L4HYS 0x37 /* L4 hysteresis */
73 #define ADP8870_L5TRP 0x38 /* L5 comparator reference */
74 #define ADP8870_L5HYS 0x39 /* L5 hysteresis */
75 #define ADP8870_PH1LEVL 0x40 /* First phototransistor ambient light level-low byte register */
76 #define ADP8870_PH1LEVH 0x41 /* First phototransistor ambient light level-high byte register */
77 #define ADP8870_PH2LEVL 0x42 /* Second phototransistor ambient light level-low byte register */
78 #define ADP8870_PH2LEVH 0x43 /* Second phototransistor ambient light level-high byte register */
80 #define ADP8870_MANUFID 0x3 /* Analog Devices AD8870 Manufacturer and device ID */
81 #define ADP8870_DEVID(x) ((x) & 0xF)
82 #define ADP8870_MANID(x) ((x) >> 4)
84 /* MDCR Device mode and status */
85 #define D7ALSEN (1 << 7)
86 #define INT_CFG (1 << 6)
87 #define NSTBY (1 << 5)
88 #define DIM_EN (1 << 4)
89 #define GDWN_DIS (1 << 3)
90 #define SIS_EN (1 << 2)
91 #define CMP_AUTOEN (1 << 1)
94 /* ADP8870_ALS1_EN Main ALS comparator level enable */
95 #define L5_EN (1 << 3)
96 #define L4_EN (1 << 2)
97 #define L3_EN (1 << 1)
98 #define L2_EN (1 << 0)
100 #define CFGR_BLV_SHIFT 3
101 #define CFGR_BLV_MASK 0x7
102 #define ADP8870_FLAG_LED_MASK 0xFF
104 #define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4))
105 #define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))
106 #define ALS_CMPR_CFG_VAL(filt) ((0x7 & (filt)) << 1)
109 struct i2c_client *client;
110 struct backlight_device *bl;
111 struct adp8870_led *led;
112 struct adp8870_backlight_platform_data *pdata;
114 unsigned long cached_daylight_max;
117 int current_brightness;
121 struct led_classdev cdev;
122 struct work_struct work;
123 struct i2c_client *client;
124 enum led_brightness new_brightness;
129 static int adp8870_read(struct i2c_client *client, int reg, uint8_t *val)
133 ret = i2c_smbus_read_byte_data(client, reg);
135 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
144 static int adp8870_write(struct i2c_client *client, u8 reg, u8 val)
146 int ret = i2c_smbus_write_byte_data(client, reg, val);
149 dev_err(&client->dev, "failed to write\n");
154 static int adp8870_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
156 struct adp8870_bl *data = i2c_get_clientdata(client);
160 mutex_lock(&data->lock);
162 ret = adp8870_read(client, reg, ®_val);
164 if (!ret && ((reg_val & bit_mask) != bit_mask)) {
166 ret = adp8870_write(client, reg, reg_val);
169 mutex_unlock(&data->lock);
173 static int adp8870_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
175 struct adp8870_bl *data = i2c_get_clientdata(client);
179 mutex_lock(&data->lock);
181 ret = adp8870_read(client, reg, ®_val);
183 if (!ret && (reg_val & bit_mask)) {
184 reg_val &= ~bit_mask;
185 ret = adp8870_write(client, reg, reg_val);
188 mutex_unlock(&data->lock);
193 * Independent sink / LED
195 #if defined(ADP8870_USE_LEDS)
196 static void adp8870_led_work(struct work_struct *work)
198 struct adp8870_led *led = container_of(work, struct adp8870_led, work);
200 adp8870_write(led->client, ADP8870_ISC1 + led->id - 1,
201 led->new_brightness >> 1);
204 static void adp8870_led_set(struct led_classdev *led_cdev,
205 enum led_brightness value)
207 struct adp8870_led *led;
209 led = container_of(led_cdev, struct adp8870_led, cdev);
210 led->new_brightness = value;
212 * Use workqueue for IO since I2C operations can sleep.
214 schedule_work(&led->work);
217 static int adp8870_led_setup(struct adp8870_led *led)
219 struct i2c_client *client = led->client;
222 ret = adp8870_write(client, ADP8870_ISC1 + led->id - 1, 0);
226 ret = adp8870_set_bits(client, ADP8870_ISCC, 1 << (led->id - 1));
231 ret = adp8870_set_bits(client, ADP8870_ISCT1,
232 (led->flags & 0x3) << ((led->id - 5) * 2));
234 ret = adp8870_set_bits(client, ADP8870_ISCT2,
235 (led->flags & 0x3) << ((led->id - 1) * 2));
240 static int adp8870_led_probe(struct i2c_client *client)
242 struct adp8870_backlight_platform_data *pdata =
243 dev_get_platdata(&client->dev);
244 struct adp8870_bl *data = i2c_get_clientdata(client);
245 struct adp8870_led *led, *led_dat;
246 struct led_info *cur_led;
249 led = devm_kzalloc(&client->dev, pdata->num_leds * sizeof(*led),
254 ret = adp8870_write(client, ADP8870_ISCLAW, pdata->led_fade_law);
258 ret = adp8870_write(client, ADP8870_ISCT1,
259 (pdata->led_on_time & 0x3) << 6);
263 ret = adp8870_write(client, ADP8870_ISCF,
264 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
268 for (i = 0; i < pdata->num_leds; ++i) {
269 cur_led = &pdata->leds[i];
272 led_dat->id = cur_led->flags & ADP8870_FLAG_LED_MASK;
274 if (led_dat->id > 7 || led_dat->id < 1) {
275 dev_err(&client->dev, "Invalid LED ID %d\n",
281 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {
282 dev_err(&client->dev, "LED %d used by Backlight\n",
288 led_dat->cdev.name = cur_led->name;
289 led_dat->cdev.default_trigger = cur_led->default_trigger;
290 led_dat->cdev.brightness_set = adp8870_led_set;
291 led_dat->cdev.brightness = LED_OFF;
292 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;
293 led_dat->client = client;
294 led_dat->new_brightness = LED_OFF;
295 INIT_WORK(&led_dat->work, adp8870_led_work);
297 ret = led_classdev_register(&client->dev, &led_dat->cdev);
299 dev_err(&client->dev, "failed to register LED %d\n",
304 ret = adp8870_led_setup(led_dat);
306 dev_err(&client->dev, "failed to write\n");
317 for (i = i - 1; i >= 0; --i) {
318 led_classdev_unregister(&led[i].cdev);
319 cancel_work_sync(&led[i].work);
325 static int adp8870_led_remove(struct i2c_client *client)
327 struct adp8870_backlight_platform_data *pdata =
328 dev_get_platdata(&client->dev);
329 struct adp8870_bl *data = i2c_get_clientdata(client);
332 for (i = 0; i < pdata->num_leds; i++) {
333 led_classdev_unregister(&data->led[i].cdev);
334 cancel_work_sync(&data->led[i].work);
340 static int adp8870_led_probe(struct i2c_client *client)
345 static int adp8870_led_remove(struct i2c_client *client)
351 static int adp8870_bl_set(struct backlight_device *bl, int brightness)
353 struct adp8870_bl *data = bl_get_data(bl);
354 struct i2c_client *client = data->client;
357 if (data->pdata->en_ambl_sens) {
358 if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) {
359 /* Disable Ambient Light auto adjust */
360 ret = adp8870_clr_bits(client, ADP8870_MDCR,
364 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
369 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
370 * restore daylight l1 sysfs brightness
372 ret = adp8870_write(client, ADP8870_BLMX1,
373 data->cached_daylight_max);
377 ret = adp8870_set_bits(client, ADP8870_MDCR,
383 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
388 if (data->current_brightness && brightness == 0)
389 ret = adp8870_set_bits(client,
390 ADP8870_MDCR, DIM_EN);
391 else if (data->current_brightness == 0 && brightness)
392 ret = adp8870_clr_bits(client,
393 ADP8870_MDCR, DIM_EN);
396 data->current_brightness = brightness;
401 static int adp8870_bl_update_status(struct backlight_device *bl)
403 int brightness = bl->props.brightness;
405 if (bl->props.power != FB_BLANK_UNBLANK)
408 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
411 return adp8870_bl_set(bl, brightness);
414 static int adp8870_bl_get_brightness(struct backlight_device *bl)
416 struct adp8870_bl *data = bl_get_data(bl);
418 return data->current_brightness;
421 static const struct backlight_ops adp8870_bl_ops = {
422 .update_status = adp8870_bl_update_status,
423 .get_brightness = adp8870_bl_get_brightness,
426 static int adp8870_bl_setup(struct backlight_device *bl)
428 struct adp8870_bl *data = bl_get_data(bl);
429 struct i2c_client *client = data->client;
430 struct adp8870_backlight_platform_data *pdata = data->pdata;
433 ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign);
437 ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign);
441 ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max);
445 ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim);
449 if (pdata->en_ambl_sens) {
450 data->cached_daylight_max = pdata->l1_daylight_max;
451 ret = adp8870_write(client, ADP8870_BLMX2,
452 pdata->l2_bright_max);
455 ret = adp8870_write(client, ADP8870_BLDM2,
456 pdata->l2_bright_dim);
460 ret = adp8870_write(client, ADP8870_BLMX3,
461 pdata->l3_office_max);
464 ret = adp8870_write(client, ADP8870_BLDM3,
465 pdata->l3_office_dim);
469 ret = adp8870_write(client, ADP8870_BLMX4,
470 pdata->l4_indoor_max);
474 ret = adp8870_write(client, ADP8870_BLDM4,
475 pdata->l4_indor_dim);
479 ret = adp8870_write(client, ADP8870_BLMX5,
484 ret = adp8870_write(client, ADP8870_BLDM5,
489 ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip);
493 ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst);
497 ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip);
501 ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst);
505 ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip);
509 ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst);
513 ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip);
517 ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst);
521 ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN |
526 ret = adp8870_write(client, ADP8870_CMP_CTL,
527 ALS_CMPR_CFG_VAL(pdata->abml_filt));
532 ret = adp8870_write(client, ADP8870_CFGR,
533 BL_CFGR_VAL(pdata->bl_fade_law, 0));
537 ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in,
538 pdata->bl_fade_out));
542 * ADP8870 Rev0 requires GDWN_DIS bit set
545 ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY |
546 (data->revid == 0 ? GDWN_DIS : 0));
551 static ssize_t adp8870_show(struct device *dev, char *buf, int reg)
553 struct adp8870_bl *data = dev_get_drvdata(dev);
557 mutex_lock(&data->lock);
558 error = adp8870_read(data->client, reg, ®_val);
559 mutex_unlock(&data->lock);
564 return sprintf(buf, "%u\n", reg_val);
567 static ssize_t adp8870_store(struct device *dev, const char *buf,
568 size_t count, int reg)
570 struct adp8870_bl *data = dev_get_drvdata(dev);
574 ret = kstrtoul(buf, 10, &val);
578 mutex_lock(&data->lock);
579 adp8870_write(data->client, reg, val);
580 mutex_unlock(&data->lock);
585 static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
588 return adp8870_show(dev, buf, ADP8870_BLMX5);
591 static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev,
592 struct device_attribute *attr, const char *buf, size_t count)
594 return adp8870_store(dev, buf, count, ADP8870_BLMX5);
596 static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show,
597 adp8870_bl_l5_dark_max_store);
600 static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev,
601 struct device_attribute *attr, char *buf)
603 return adp8870_show(dev, buf, ADP8870_BLMX4);
606 static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev,
607 struct device_attribute *attr, const char *buf, size_t count)
609 return adp8870_store(dev, buf, count, ADP8870_BLMX4);
611 static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show,
612 adp8870_bl_l4_indoor_max_store);
615 static ssize_t adp8870_bl_l3_office_max_show(struct device *dev,
616 struct device_attribute *attr, char *buf)
618 return adp8870_show(dev, buf, ADP8870_BLMX3);
621 static ssize_t adp8870_bl_l3_office_max_store(struct device *dev,
622 struct device_attribute *attr, const char *buf, size_t count)
624 return adp8870_store(dev, buf, count, ADP8870_BLMX3);
627 static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show,
628 adp8870_bl_l3_office_max_store);
630 static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev,
631 struct device_attribute *attr, char *buf)
633 return adp8870_show(dev, buf, ADP8870_BLMX2);
636 static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev,
637 struct device_attribute *attr, const char *buf, size_t count)
639 return adp8870_store(dev, buf, count, ADP8870_BLMX2);
641 static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show,
642 adp8870_bl_l2_bright_max_store);
644 static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev,
645 struct device_attribute *attr, char *buf)
647 return adp8870_show(dev, buf, ADP8870_BLMX1);
650 static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev,
651 struct device_attribute *attr, const char *buf, size_t count)
653 struct adp8870_bl *data = dev_get_drvdata(dev);
654 int ret = kstrtoul(buf, 10, &data->cached_daylight_max);
659 return adp8870_store(dev, buf, count, ADP8870_BLMX1);
661 static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show,
662 adp8870_bl_l1_daylight_max_store);
664 static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev,
665 struct device_attribute *attr, char *buf)
667 return adp8870_show(dev, buf, ADP8870_BLDM5);
670 static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev,
671 struct device_attribute *attr,
672 const char *buf, size_t count)
674 return adp8870_store(dev, buf, count, ADP8870_BLDM5);
676 static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show,
677 adp8870_bl_l5_dark_dim_store);
679 static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev,
680 struct device_attribute *attr, char *buf)
682 return adp8870_show(dev, buf, ADP8870_BLDM4);
685 static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev,
686 struct device_attribute *attr,
687 const char *buf, size_t count)
689 return adp8870_store(dev, buf, count, ADP8870_BLDM4);
691 static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show,
692 adp8870_bl_l4_indoor_dim_store);
695 static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev,
696 struct device_attribute *attr, char *buf)
698 return adp8870_show(dev, buf, ADP8870_BLDM3);
701 static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev,
702 struct device_attribute *attr,
703 const char *buf, size_t count)
705 return adp8870_store(dev, buf, count, ADP8870_BLDM3);
707 static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show,
708 adp8870_bl_l3_office_dim_store);
710 static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev,
711 struct device_attribute *attr, char *buf)
713 return adp8870_show(dev, buf, ADP8870_BLDM2);
716 static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev,
717 struct device_attribute *attr,
718 const char *buf, size_t count)
720 return adp8870_store(dev, buf, count, ADP8870_BLDM2);
722 static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show,
723 adp8870_bl_l2_bright_dim_store);
725 static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev,
726 struct device_attribute *attr, char *buf)
728 return adp8870_show(dev, buf, ADP8870_BLDM1);
731 static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev,
732 struct device_attribute *attr,
733 const char *buf, size_t count)
735 return adp8870_store(dev, buf, count, ADP8870_BLDM1);
737 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show,
738 adp8870_bl_l1_daylight_dim_store);
740 #ifdef ADP8870_EXT_FEATURES
741 static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev,
742 struct device_attribute *attr, char *buf)
744 struct adp8870_bl *data = dev_get_drvdata(dev);
749 mutex_lock(&data->lock);
750 error = adp8870_read(data->client, ADP8870_PH1LEVL, ®_val);
752 mutex_unlock(&data->lock);
756 error = adp8870_read(data->client, ADP8870_PH1LEVH, ®_val);
757 mutex_unlock(&data->lock);
762 /* Return 13-bit conversion value for the first light sensor */
763 ret_val += (reg_val & 0x1F) << 8;
765 return sprintf(buf, "%u\n", ret_val);
767 static DEVICE_ATTR(ambient_light_level, 0444,
768 adp8870_bl_ambient_light_level_show, NULL);
770 static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev,
771 struct device_attribute *attr, char *buf)
773 struct adp8870_bl *data = dev_get_drvdata(dev);
777 mutex_lock(&data->lock);
778 error = adp8870_read(data->client, ADP8870_CFGR, ®_val);
779 mutex_unlock(&data->lock);
784 return sprintf(buf, "%u\n",
785 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
788 static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
789 struct device_attribute *attr,
790 const char *buf, size_t count)
792 struct adp8870_bl *data = dev_get_drvdata(dev);
797 ret = kstrtoul(buf, 10, &val);
802 /* Enable automatic ambient light sensing */
803 adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
804 } else if ((val > 0) && (val < 6)) {
805 /* Disable automatic ambient light sensing */
806 adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
808 /* Set user supplied ambient light zone */
809 mutex_lock(&data->lock);
810 ret = adp8870_read(data->client, ADP8870_CFGR, ®_val);
812 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
813 reg_val |= (val - 1) << CFGR_BLV_SHIFT;
814 adp8870_write(data->client, ADP8870_CFGR, reg_val);
816 mutex_unlock(&data->lock);
821 static DEVICE_ATTR(ambient_light_zone, 0664,
822 adp8870_bl_ambient_light_zone_show,
823 adp8870_bl_ambient_light_zone_store);
826 static struct attribute *adp8870_bl_attributes[] = {
827 &dev_attr_l5_dark_max.attr,
828 &dev_attr_l5_dark_dim.attr,
829 &dev_attr_l4_indoor_max.attr,
830 &dev_attr_l4_indoor_dim.attr,
831 &dev_attr_l3_office_max.attr,
832 &dev_attr_l3_office_dim.attr,
833 &dev_attr_l2_bright_max.attr,
834 &dev_attr_l2_bright_dim.attr,
835 &dev_attr_l1_daylight_max.attr,
836 &dev_attr_l1_daylight_dim.attr,
837 #ifdef ADP8870_EXT_FEATURES
838 &dev_attr_ambient_light_level.attr,
839 &dev_attr_ambient_light_zone.attr,
844 static const struct attribute_group adp8870_bl_attr_group = {
845 .attrs = adp8870_bl_attributes,
848 static int adp8870_probe(struct i2c_client *client,
849 const struct i2c_device_id *id)
851 struct backlight_properties props;
852 struct backlight_device *bl;
853 struct adp8870_bl *data;
854 struct adp8870_backlight_platform_data *pdata =
855 dev_get_platdata(&client->dev);
859 if (!i2c_check_functionality(client->adapter,
860 I2C_FUNC_SMBUS_BYTE_DATA)) {
861 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
866 dev_err(&client->dev, "no platform data?\n");
870 ret = adp8870_read(client, ADP8870_MFDVID, ®_val);
874 if (ADP8870_MANID(reg_val) != ADP8870_MANUFID) {
875 dev_err(&client->dev, "failed to probe\n");
879 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
883 data->revid = ADP8870_DEVID(reg_val);
884 data->client = client;
886 data->id = id->driver_data;
887 data->current_brightness = 0;
888 i2c_set_clientdata(client, data);
890 mutex_init(&data->lock);
892 memset(&props, 0, sizeof(props));
893 props.type = BACKLIGHT_RAW;
894 props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS;
895 bl = devm_backlight_device_register(&client->dev,
896 dev_driver_string(&client->dev),
897 &client->dev, data, &adp8870_bl_ops, &props);
899 dev_err(&client->dev, "failed to register backlight\n");
905 if (pdata->en_ambl_sens) {
906 ret = sysfs_create_group(&bl->dev.kobj,
907 &adp8870_bl_attr_group);
909 dev_err(&client->dev, "failed to register sysfs\n");
914 ret = adp8870_bl_setup(bl);
920 backlight_update_status(bl);
922 dev_info(&client->dev, "Rev.%d Backlight\n", data->revid);
925 adp8870_led_probe(client);
930 if (data->pdata->en_ambl_sens)
931 sysfs_remove_group(&data->bl->dev.kobj,
932 &adp8870_bl_attr_group);
937 static int adp8870_remove(struct i2c_client *client)
939 struct adp8870_bl *data = i2c_get_clientdata(client);
941 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
944 adp8870_led_remove(client);
946 if (data->pdata->en_ambl_sens)
947 sysfs_remove_group(&data->bl->dev.kobj,
948 &adp8870_bl_attr_group);
953 #ifdef CONFIG_PM_SLEEP
954 static int adp8870_i2c_suspend(struct device *dev)
956 struct i2c_client *client = to_i2c_client(dev);
958 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
963 static int adp8870_i2c_resume(struct device *dev)
965 struct i2c_client *client = to_i2c_client(dev);
967 adp8870_set_bits(client, ADP8870_MDCR, NSTBY | BLEN);
973 static SIMPLE_DEV_PM_OPS(adp8870_i2c_pm_ops, adp8870_i2c_suspend,
976 static const struct i2c_device_id adp8870_id[] = {
980 MODULE_DEVICE_TABLE(i2c, adp8870_id);
982 static struct i2c_driver adp8870_driver = {
984 .name = KBUILD_MODNAME,
985 .pm = &adp8870_i2c_pm_ops,
987 .probe = adp8870_probe,
988 .remove = adp8870_remove,
989 .id_table = adp8870_id,
992 module_i2c_driver(adp8870_driver);
994 MODULE_LICENSE("GPL v2");
995 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
996 MODULE_DESCRIPTION("ADP8870 Backlight driver");