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Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[deliverable/linux.git] / drivers / video / backlight / adp8860_bl.c
CommitLineData
82fd53b7
MH		 1/*
2 * Backlight driver for Analog Devices ADP8860 Backlight Devices
3 *
4 * Copyright 2009-2010 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <linux/module.h>
82fd53b7
MH		 10#include <linux/init.h>
11#include <linux/errno.h>
12#include <linux/pm.h>
13#include <linux/platform_device.h>
14#include <linux/i2c.h>
15#include <linux/fb.h>
16#include <linux/backlight.h>
17#include <linux/leds.h>
3f43f8b2 18#include <linux/slab.h>
82fd53b7
MH		 19#include <linux/workqueue.h>
20
21#include <linux/i2c/adp8860.h>
22#define ADP8860_EXT_FEATURES
23#define ADP8860_USE_LEDS
24
25#define ADP8860_MFDVID 0x00 /* Manufacturer and device ID */
26#define ADP8860_MDCR 0x01 /* Device mode and status */
27#define ADP8860_MDCR2 0x02 /* Device mode and Status Register 2 */
28#define ADP8860_INTR_EN 0x03 /* Interrupts enable */
29#define ADP8860_CFGR 0x04 /* Configuration register */
30#define ADP8860_BLSEN 0x05 /* Sink enable backlight or independent */
31#define ADP8860_BLOFF 0x06 /* Backlight off timeout */
32#define ADP8860_BLDIM 0x07 /* Backlight dim timeout */
33#define ADP8860_BLFR 0x08 /* Backlight fade in and out rates */
34#define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */
35#define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */
36#define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */
37#define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */
38#define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */
39#define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */
40#define ADP8860_ISCFR 0x0F /* Independent sink current fade control register */
41#define ADP8860_ISCC 0x10 /* Independent sink current control register */
42#define ADP8860_ISCT1 0x11 /* Independent Sink Current Timer Register LED[7:5] */
43#define ADP8860_ISCT2 0x12 /* Independent Sink Current Timer Register LED[4:1] */
44#define ADP8860_ISCF 0x13 /* Independent sink current fade register */
45#define ADP8860_ISC7 0x14 /* Independent Sink Current LED7 */
46#define ADP8860_ISC6 0x15 /* Independent Sink Current LED6 */
47#define ADP8860_ISC5 0x16 /* Independent Sink Current LED5 */
48#define ADP8860_ISC4 0x17 /* Independent Sink Current LED4 */
49#define ADP8860_ISC3 0x18 /* Independent Sink Current LED3 */
50#define ADP8860_ISC2 0x19 /* Independent Sink Current LED2 */
51#define ADP8860_ISC1 0x1A /* Independent Sink Current LED1 */
52#define ADP8860_CCFG 0x1B /* Comparator configuration */
53#define ADP8860_CCFG2 0x1C /* Second comparator configuration */
54#define ADP8860_L2_TRP 0x1D /* L2 comparator reference */
55#define ADP8860_L2_HYS 0x1E /* L2 hysteresis */
56#define ADP8860_L3_TRP 0x1F /* L3 comparator reference */
57#define ADP8860_L3_HYS 0x20 /* L3 hysteresis */
58#define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */
59#define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */
60#define ADP8860_PH2LEVL 0x23 /* Second phototransistor ambient light level-low byte register */
61#define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */
62
63#define ADP8860_MANUFID 0x0 /* Analog Devices ADP8860 Manufacturer ID */
c7c06d8a
MH		 64#define ADP8861_MANUFID 0x4 /* Analog Devices ADP8861 Manufacturer ID */
65#define ADP8863_MANUFID 0x2 /* Analog Devices ADP8863 Manufacturer ID */
66
82fd53b7
MH		 67#define ADP8860_DEVID(x) ((x) & 0xF)
68#define ADP8860_MANID(x) ((x) >> 4)
69
70/* MDCR Device mode and status */
71#define INT_CFG (1 << 6)
72#define NSTBY (1 << 5)
73#define DIM_EN (1 << 4)
c7c06d8a 74#define GDWN_DIS (1 << 3)
82fd53b7
MH		 75#define SIS_EN (1 << 2)
76#define CMP_AUTOEN (1 << 1)
77#define BLEN (1 << 0)
78
79/* ADP8860_CCFG Main ALS comparator level enable */
80#define L3_EN (1 << 1)
81#define L2_EN (1 << 0)
82
83#define CFGR_BLV_SHIFT 3
84#define CFGR_BLV_MASK 0x3
85#define ADP8860_FLAG_LED_MASK 0xFF
86
87#define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4))
88#define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))
89#define ALS_CCFG_VAL(filt) ((0x7 & filt) << 5)
90
c7c06d8a
MH		 91enum {
92 adp8860,
93 adp8861,
94 adp8863
95};
96
82fd53b7
MH		 97struct adp8860_led {
98 struct led_classdev cdev;
99 struct work_struct work;
100 struct i2c_client *client;
101 enum led_brightness new_brightness;
102 int id;
103 int flags;
104};
105
106struct adp8860_bl {
107 struct i2c_client *client;
108 struct backlight_device *bl;
109 struct adp8860_led *led;
110 struct adp8860_backlight_platform_data *pdata;
111 struct mutex lock;
112 unsigned long cached_daylight_max;
113 int id;
114 int revid;
115 int current_brightness;
c7c06d8a
MH		 116 unsigned en_ambl_sens:1;
117 unsigned gdwn_dis:1;
82fd53b7
MH		 118};
119
120static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val)
121{
122 int ret;
123
124 ret = i2c_smbus_read_byte_data(client, reg);
125 if (ret < 0) {
126 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
127 return ret;
128 }
129
130 *val = (uint8_t)ret;
131 return 0;
132}
133
82fd53b7
MH		 134static int adp8860_write(struct i2c_client *client, u8 reg, u8 val)
135{
136 return i2c_smbus_write_byte_data(client, reg, val);
137}
138
139static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
140{
141 struct adp8860_bl *data = i2c_get_clientdata(client);
142 uint8_t reg_val;
143 int ret;
144
145 mutex_lock(&data->lock);
146
147 ret = adp8860_read(client, reg, &reg_val);
148
36c3e759 149 if (!ret && ((reg_val & bit_mask) != bit_mask)) {
82fd53b7
MH		 150 reg_val |= bit_mask;
151 ret = adp8860_write(client, reg, reg_val);
152 }
153
154 mutex_unlock(&data->lock);
155 return ret;
156}
157
158static int adp8860_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
159{
160 struct adp8860_bl *data = i2c_get_clientdata(client);
161 uint8_t reg_val;
162 int ret;
163
164 mutex_lock(&data->lock);
165
166 ret = adp8860_read(client, reg, &reg_val);
167
168 if (!ret && (reg_val & bit_mask)) {
169 reg_val &= ~bit_mask;
170 ret = adp8860_write(client, reg, reg_val);
171 }
172
173 mutex_unlock(&data->lock);
174 return ret;
175}
176
177/*
178 * Independent sink / LED
179 */
180#if defined(ADP8860_USE_LEDS)
181static void adp8860_led_work(struct work_struct *work)
182{
183 struct adp8860_led *led = container_of(work, struct adp8860_led, work);
5e548f0f 184
82fd53b7
MH		 185 adp8860_write(led->client, ADP8860_ISC1 - led->id + 1,
186 led->new_brightness >> 1);
187}
188
189static void adp8860_led_set(struct led_classdev *led_cdev,
190 enum led_brightness value)
191{
192 struct adp8860_led *led;
193
194 led = container_of(led_cdev, struct adp8860_led, cdev);
195 led->new_brightness = value;
196 schedule_work(&led->work);
197}
198
199static int adp8860_led_setup(struct adp8860_led *led)
200{
201 struct i2c_client *client = led->client;
202 int ret = 0;
203
204 ret = adp8860_write(client, ADP8860_ISC1 - led->id + 1, 0);
205 ret |= adp8860_set_bits(client, ADP8860_ISCC, 1 << (led->id - 1));
206
207 if (led->id > 4)
208 ret |= adp8860_set_bits(client, ADP8860_ISCT1,
209 (led->flags & 0x3) << ((led->id - 5) * 2));
210 else
211 ret |= adp8860_set_bits(client, ADP8860_ISCT2,
212 (led->flags & 0x3) << ((led->id - 1) * 2));
213
214 return ret;
215}
216
1b9e450d 217static int adp8860_led_probe(struct i2c_client *client)
82fd53b7
MH		 218{
219 struct adp8860_backlight_platform_data *pdata =
c512794c 220 dev_get_platdata(&client->dev);
82fd53b7
MH		 221 struct adp8860_bl *data = i2c_get_clientdata(client);
222 struct adp8860_led *led, *led_dat;
223 struct led_info *cur_led;
224 int ret, i;
225
58875ea9
JH		 226 led = devm_kzalloc(&client->dev, sizeof(*led) * pdata->num_leds,
227 GFP_KERNEL);
ba464d0c 228 if (led == NULL)
82fd53b7 229 return -ENOMEM;
82fd53b7
MH		 230
231 ret = adp8860_write(client, ADP8860_ISCFR, pdata->led_fade_law);
232 ret = adp8860_write(client, ADP8860_ISCT1,
233 (pdata->led_on_time & 0x3) << 6);
234 ret |= adp8860_write(client, ADP8860_ISCF,
235 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
236
237 if (ret) {
238 dev_err(&client->dev, "failed to write\n");
58875ea9 239 return ret;
82fd53b7
MH		 240 }
241
242 for (i = 0; i < pdata->num_leds; ++i) {
243 cur_led = &pdata->leds[i];
244 led_dat = &led[i];
245
246 led_dat->id = cur_led->flags & ADP8860_FLAG_LED_MASK;
247
248 if (led_dat->id > 7 || led_dat->id < 1) {
249 dev_err(&client->dev, "Invalid LED ID %d\n",
250 led_dat->id);
84eba9ed 251 ret = -EINVAL;
82fd53b7
MH		 252 goto err;
253 }
254
255 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {
256 dev_err(&client->dev, "LED %d used by Backlight\n",
257 led_dat->id);
84eba9ed 258 ret = -EBUSY;
82fd53b7
MH		 259 goto err;
260 }
261
262 led_dat->cdev.name = cur_led->name;
263 led_dat->cdev.default_trigger = cur_led->default_trigger;
264 led_dat->cdev.brightness_set = adp8860_led_set;
265 led_dat->cdev.brightness = LED_OFF;
266 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;
267 led_dat->client = client;
268 led_dat->new_brightness = LED_OFF;
269 INIT_WORK(&led_dat->work, adp8860_led_work);
270
271 ret = led_classdev_register(&client->dev, &led_dat->cdev);
272 if (ret) {
273 dev_err(&client->dev, "failed to register LED %d\n",
274 led_dat->id);
275 goto err;
276 }
277
278 ret = adp8860_led_setup(led_dat);
279 if (ret) {
280 dev_err(&client->dev, "failed to write\n");
281 i++;
282 goto err;
283 }
284 }
285
286 data->led = led;
287
288 return 0;
289
290 err:
291 for (i = i - 1; i >= 0; --i) {
292 led_classdev_unregister(&led[i].cdev);
293 cancel_work_sync(&led[i].work);
294 }
295
82fd53b7
MH		 296 return ret;
297}
298
7e4b9d0b 299static int adp8860_led_remove(struct i2c_client *client)
82fd53b7
MH		 300{
301 struct adp8860_backlight_platform_data *pdata =
c512794c 302 dev_get_platdata(&client->dev);
82fd53b7
MH		 303 struct adp8860_bl *data = i2c_get_clientdata(client);
304 int i;
305
306 for (i = 0; i < pdata->num_leds; i++) {
307 led_classdev_unregister(&data->led[i].cdev);
308 cancel_work_sync(&data->led[i].work);
309 }
310
82fd53b7
MH		 311 return 0;
312}
313#else
1b9e450d 314static int adp8860_led_probe(struct i2c_client *client)
82fd53b7
MH		 315{
316 return 0;
317}
318
7e4b9d0b 319static int adp8860_led_remove(struct i2c_client *client)
82fd53b7
MH		 320{
321 return 0;
322}
323#endif
324
325static int adp8860_bl_set(struct backlight_device *bl, int brightness)
326{
327 struct adp8860_bl *data = bl_get_data(bl);
328 struct i2c_client *client = data->client;
329 int ret = 0;
330
c7c06d8a 331 if (data->en_ambl_sens) {
82fd53b7
MH		 332 if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) {
333 /* Disable Ambient Light auto adjust */
334 ret |= adp8860_clr_bits(client, ADP8860_MDCR,
335 CMP_AUTOEN);
336 ret |= adp8860_write(client, ADP8860_BLMX1, brightness);
337 } else {
338 /*
339 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
340 * restore daylight l1 sysfs brightness
341 */
342 ret |= adp8860_write(client, ADP8860_BLMX1,
343 data->cached_daylight_max);
344 ret |= adp8860_set_bits(client, ADP8860_MDCR,
345 CMP_AUTOEN);
346 }
347 } else
348 ret |= adp8860_write(client, ADP8860_BLMX1, brightness);
349
350 if (data->current_brightness && brightness == 0)
351 ret |= adp8860_set_bits(client,
352 ADP8860_MDCR, DIM_EN);
353 else if (data->current_brightness == 0 && brightness)
354 ret |= adp8860_clr_bits(client,
355 ADP8860_MDCR, DIM_EN);
356
357 if (!ret)
358 data->current_brightness = brightness;
359
360 return ret;
361}
362
363static int adp8860_bl_update_status(struct backlight_device *bl)
364{
365 int brightness = bl->props.brightness;
5e548f0f 366
82fd53b7
MH		 367 if (bl->props.power != FB_BLANK_UNBLANK)
368 brightness = 0;
369
370 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
371 brightness = 0;
372
373 return adp8860_bl_set(bl, brightness);
374}
375
376static int adp8860_bl_get_brightness(struct backlight_device *bl)
377{
378 struct adp8860_bl *data = bl_get_data(bl);
379
380 return data->current_brightness;
381}
382
383static const struct backlight_ops adp8860_bl_ops = {
384 .update_status = adp8860_bl_update_status,
385 .get_brightness = adp8860_bl_get_brightness,
386};
387
388static int adp8860_bl_setup(struct backlight_device *bl)
389{
390 struct adp8860_bl *data = bl_get_data(bl);
391 struct i2c_client *client = data->client;
392 struct adp8860_backlight_platform_data *pdata = data->pdata;
393 int ret = 0;
394
395 ret |= adp8860_write(client, ADP8860_BLSEN, ~pdata->bl_led_assign);
396 ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max);
397 ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim);
398
c7c06d8a 399 if (data->en_ambl_sens) {
82fd53b7
MH		 400 data->cached_daylight_max = pdata->l1_daylight_max;
401 ret |= adp8860_write(client, ADP8860_BLMX2,
402 pdata->l2_office_max);
403 ret |= adp8860_write(client, ADP8860_BLDM2,
404 pdata->l2_office_dim);
405 ret |= adp8860_write(client, ADP8860_BLMX3,
406 pdata->l3_dark_max);
407 ret |= adp8860_write(client, ADP8860_BLDM3,
408 pdata->l3_dark_dim);
409
410 ret |= adp8860_write(client, ADP8860_L2_TRP, pdata->l2_trip);
411 ret |= adp8860_write(client, ADP8860_L2_HYS, pdata->l2_hyst);
412 ret |= adp8860_write(client, ADP8860_L3_TRP, pdata->l3_trip);
413 ret |= adp8860_write(client, ADP8860_L3_HYS, pdata->l3_hyst);
414 ret |= adp8860_write(client, ADP8860_CCFG, L2_EN | L3_EN |
415 ALS_CCFG_VAL(pdata->abml_filt));
416 }
417
418 ret |= adp8860_write(client, ADP8860_CFGR,
419 BL_CFGR_VAL(pdata->bl_fade_law, 0));
420
421 ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in,
422 pdata->bl_fade_out));
423
c7c06d8a
MH		 424 ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY |
425 (data->gdwn_dis ? GDWN_DIS : 0));
82fd53b7
MH		 426
427 return ret;
428}
429
430static ssize_t adp8860_show(struct device *dev, char *buf, int reg)
431{
432 struct adp8860_bl *data = dev_get_drvdata(dev);
433 int error;
434 uint8_t reg_val;
435
436 mutex_lock(&data->lock);
437 error = adp8860_read(data->client, reg, &reg_val);
438 mutex_unlock(&data->lock);
439
440 if (error < 0)
441 return error;
442
443 return sprintf(buf, "%u\n", reg_val);
444}
445
446static ssize_t adp8860_store(struct device *dev, const char *buf,
447 size_t count, int reg)
448{
449 struct adp8860_bl *data = dev_get_drvdata(dev);
450 unsigned long val;
451 int ret;
452
8dd9d7f2 453 ret = kstrtoul(buf, 10, &val);
82fd53b7
MH		 454 if (ret)
455 return ret;
456
457 mutex_lock(&data->lock);
458 adp8860_write(data->client, reg, val);
459 mutex_unlock(&data->lock);
460
461 return count;
462}
463
464static ssize_t adp8860_bl_l3_dark_max_show(struct device *dev,
465 struct device_attribute *attr, char *buf)
466{
467 return adp8860_show(dev, buf, ADP8860_BLMX3);
468}
469
470static ssize_t adp8860_bl_l3_dark_max_store(struct device *dev,
471 struct device_attribute *attr, const char *buf, size_t count)
472{
473 return adp8860_store(dev, buf, count, ADP8860_BLMX3);
474}
475
476static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show,
477 adp8860_bl_l3_dark_max_store);
478
479static ssize_t adp8860_bl_l2_office_max_show(struct device *dev,
480 struct device_attribute *attr, char *buf)
481{
482 return adp8860_show(dev, buf, ADP8860_BLMX2);
483}
484
485static ssize_t adp8860_bl_l2_office_max_store(struct device *dev,
486 struct device_attribute *attr, const char *buf, size_t count)
487{
488 return adp8860_store(dev, buf, count, ADP8860_BLMX2);
489}
490static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show,
491 adp8860_bl_l2_office_max_store);
492
493static ssize_t adp8860_bl_l1_daylight_max_show(struct device *dev,
494 struct device_attribute *attr, char *buf)
495{
496 return adp8860_show(dev, buf, ADP8860_BLMX1);
497}
498
499static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev,
500 struct device_attribute *attr, const char *buf, size_t count)
501{
502 struct adp8860_bl *data = dev_get_drvdata(dev);
8dd9d7f2 503 int ret = kstrtoul(buf, 10, &data->cached_daylight_max);
5e548f0f 504
4f1aa846
MH		 505 if (ret)
506 return ret;
82fd53b7 507
82fd53b7
MH		 508 return adp8860_store(dev, buf, count, ADP8860_BLMX1);
509}
510static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show,
511 adp8860_bl_l1_daylight_max_store);
512
513static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev,
514 struct device_attribute *attr, char *buf)
515{
516 return adp8860_show(dev, buf, ADP8860_BLDM3);
517}
518
519static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev,
520 struct device_attribute *attr,
521 const char *buf, size_t count)
522{
523 return adp8860_store(dev, buf, count, ADP8860_BLDM3);
524}
525static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show,
526 adp8860_bl_l3_dark_dim_store);
527
528static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev,
529 struct device_attribute *attr, char *buf)
530{
531 return adp8860_show(dev, buf, ADP8860_BLDM2);
532}
533
534static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev,
535 struct device_attribute *attr,
536 const char *buf, size_t count)
537{
538 return adp8860_store(dev, buf, count, ADP8860_BLDM2);
539}
540static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show,
541 adp8860_bl_l2_office_dim_store);
542
543static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev,
544 struct device_attribute *attr, char *buf)
545{
546 return adp8860_show(dev, buf, ADP8860_BLDM1);
547}
548
549static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev,
550 struct device_attribute *attr,
551 const char *buf, size_t count)
552{
553 return adp8860_store(dev, buf, count, ADP8860_BLDM1);
554}
555static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show,
556 adp8860_bl_l1_daylight_dim_store);
557
558#ifdef ADP8860_EXT_FEATURES
559static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev,
560 struct device_attribute *attr, char *buf)
561{
562 struct adp8860_bl *data = dev_get_drvdata(dev);
563 int error;
564 uint8_t reg_val;
565 uint16_t ret_val;
566
567 mutex_lock(&data->lock);
568 error = adp8860_read(data->client, ADP8860_PH1LEVL, &reg_val);
02f22c00
AB		 569 if (!error) {
570 ret_val = reg_val;
571 error = adp8860_read(data->client, ADP8860_PH1LEVH, &reg_val);
572 }
82fd53b7
MH		 573 mutex_unlock(&data->lock);
574
02f22c00 575 if (error)
82fd53b7
MH		 576 return error;
577
578 /* Return 13-bit conversion value for the first light sensor */
579 ret_val += (reg_val & 0x1F) << 8;
580
581 return sprintf(buf, "%u\n", ret_val);
582}
583static DEVICE_ATTR(ambient_light_level, 0444,
584 adp8860_bl_ambient_light_level_show, NULL);
585
586static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev,
587 struct device_attribute *attr, char *buf)
588{
589 struct adp8860_bl *data = dev_get_drvdata(dev);
590 int error;
591 uint8_t reg_val;
592
593 mutex_lock(&data->lock);
594 error = adp8860_read(data->client, ADP8860_CFGR, &reg_val);
595 mutex_unlock(&data->lock);
596
597 if (error < 0)
598 return error;
599
600 return sprintf(buf, "%u\n",
601 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
602}
603
604static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev,
605 struct device_attribute *attr,
606 const char *buf, size_t count)
607{
608 struct adp8860_bl *data = dev_get_drvdata(dev);
609 unsigned long val;
610 uint8_t reg_val;
611 int ret;
612
8dd9d7f2 613 ret = kstrtoul(buf, 10, &val);
82fd53b7
MH		 614 if (ret)
615 return ret;
616
617 if (val == 0) {
618 /* Enable automatic ambient light sensing */
619 adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
c7ce2500 620 } else if ((val > 0) && (val <= 3)) {
82fd53b7
MH		 621 /* Disable automatic ambient light sensing */
622 adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
623
624 /* Set user supplied ambient light zone */
625 mutex_lock(&data->lock);
86c68e2f
AB		 626 ret = adp8860_read(data->client, ADP8860_CFGR, &reg_val);
627 if (!ret) {
628 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
629 reg_val |= (val - 1) << CFGR_BLV_SHIFT;
630 adp8860_write(data->client, ADP8860_CFGR, reg_val);
631 }
82fd53b7
MH		 632 mutex_unlock(&data->lock);
633 }
634
635 return count;
636}
637static DEVICE_ATTR(ambient_light_zone, 0664,
638 adp8860_bl_ambient_light_zone_show,
639 adp8860_bl_ambient_light_zone_store);
640#endif
641
642static struct attribute *adp8860_bl_attributes[] = {
643 &dev_attr_l3_dark_max.attr,
644 &dev_attr_l3_dark_dim.attr,
645 &dev_attr_l2_office_max.attr,
646 &dev_attr_l2_office_dim.attr,
647 &dev_attr_l1_daylight_max.attr,
648 &dev_attr_l1_daylight_dim.attr,
649#ifdef ADP8860_EXT_FEATURES
650 &dev_attr_ambient_light_level.attr,
651 &dev_attr_ambient_light_zone.attr,
652#endif
653 NULL
654};
655
656static const struct attribute_group adp8860_bl_attr_group = {
657 .attrs = adp8860_bl_attributes,
658};
659
1b9e450d 660static int adp8860_probe(struct i2c_client *client,
82fd53b7
MH		 661 const struct i2c_device_id *id)
662{
663 struct backlight_device *bl;
664 struct adp8860_bl *data;
665 struct adp8860_backlight_platform_data *pdata =
c512794c 666 dev_get_platdata(&client->dev);
3f43f8b2 667 struct backlight_properties props;
82fd53b7
MH		 668 uint8_t reg_val;
669 int ret;
670
671 if (!i2c_check_functionality(client->adapter,
672 I2C_FUNC_SMBUS_BYTE_DATA)) {
673 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
674 return -EIO;
675 }
676
677 if (!pdata) {
678 dev_err(&client->dev, "no platform data?\n");
679 return -EINVAL;
680 }
681
58875ea9 682 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
c7c06d8a
MH		 683 if (data == NULL)
684 return -ENOMEM;
685
82fd53b7
MH		 686 ret = adp8860_read(client, ADP8860_MFDVID, &reg_val);
687 if (ret < 0)
58875ea9 688 return ret;
82fd53b7 689
c7c06d8a
MH		 690 switch (ADP8860_MANID(reg_val)) {
691 case ADP8863_MANUFID:
692 data->gdwn_dis = !!pdata->gdwn_dis;
693 case ADP8860_MANUFID:
694 data->en_ambl_sens = !!pdata->en_ambl_sens;
695 break;
696 case ADP8861_MANUFID:
697 data->gdwn_dis = !!pdata->gdwn_dis;
698 break;
699 default:
82fd53b7 700 dev_err(&client->dev, "failed to probe\n");
58875ea9 701 return -ENODEV;
82fd53b7
MH		 702 }
703
82fd53b7
MH		 704 /* It's confirmed that the DEVID field is actually a REVID */
705
706 data->revid = ADP8860_DEVID(reg_val);
707 data->client = client;
708 data->pdata = pdata;
709 data->id = id->driver_data;
710 data->current_brightness = 0;
711 i2c_set_clientdata(client, data);
712
3f43f8b2 713 memset(&props, 0, sizeof(props));
bb7ca747 714 props.type = BACKLIGHT_RAW;
3f43f8b2
RD		 715 props.max_brightness = ADP8860_MAX_BRIGHTNESS;
716
82fd53b7
MH		 717 mutex_init(&data->lock);
718
91fa4ee8
JH		 719 bl = devm_backlight_device_register(&client->dev,
720 dev_driver_string(&client->dev),
721 &client->dev, data, &adp8860_bl_ops, &props);
82fd53b7
MH		 722 if (IS_ERR(bl)) {
723 dev_err(&client->dev, "failed to register backlight\n");
58875ea9 724 return PTR_ERR(bl);
82fd53b7
MH		 725 }
726
6b19bad8 727 bl->props.brightness = ADP8860_MAX_BRIGHTNESS;
82fd53b7
MH		 728
729 data->bl = bl;
730
c7c06d8a 731 if (data->en_ambl_sens)
82fd53b7
MH		 732 ret = sysfs_create_group(&bl->dev.kobj,
733 &adp8860_bl_attr_group);
734
735 if (ret) {
736 dev_err(&client->dev, "failed to register sysfs\n");
91fa4ee8 737 return ret;
82fd53b7
MH		 738 }
739
740 ret = adp8860_bl_setup(bl);
741 if (ret) {
742 ret = -EIO;
743 goto out;
744 }
745
746 backlight_update_status(bl);
747
c7c06d8a
MH		 748 dev_info(&client->dev, "%s Rev.%d Backlight\n",
749 client->name, data->revid);
82fd53b7
MH		 750
751 if (pdata->num_leds)
752 adp8860_led_probe(client);
753
754 return 0;
755
756out:
c7c06d8a 757 if (data->en_ambl_sens)
82fd53b7
MH		 758 sysfs_remove_group(&data->bl->dev.kobj,
759 &adp8860_bl_attr_group);
82fd53b7
MH		 760
761 return ret;
762}
763
7e4b9d0b 764static int adp8860_remove(struct i2c_client *client)
82fd53b7
MH		 765{
766 struct adp8860_bl *data = i2c_get_clientdata(client);
767
768 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);
769
770 if (data->led)
771 adp8860_led_remove(client);
772
c7c06d8a 773 if (data->en_ambl_sens)
82fd53b7
MH		 774 sysfs_remove_group(&data->bl->dev.kobj,
775 &adp8860_bl_attr_group);
776
82fd53b7
MH		 777 return 0;
778}
779
cf108b5c
JH		 780#ifdef CONFIG_PM_SLEEP
781static int adp8860_i2c_suspend(struct device *dev)
82fd53b7 782{
cf108b5c
JH		 783 struct i2c_client *client = to_i2c_client(dev);
784
82fd53b7
MH		 785 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);
786
787 return 0;
788}
789
cf108b5c 790static int adp8860_i2c_resume(struct device *dev)
82fd53b7 791{
cf108b5c
JH		 792 struct i2c_client *client = to_i2c_client(dev);
793
5eb02c01 794 adp8860_set_bits(client, ADP8860_MDCR, NSTBY | BLEN);
82fd53b7
MH		 795
796 return 0;
797}
82fd53b7
MH		 798#endif
799
cf108b5c
JH		 800static SIMPLE_DEV_PM_OPS(adp8860_i2c_pm_ops, adp8860_i2c_suspend,
801 adp8860_i2c_resume);
802
82fd53b7 803static const struct i2c_device_id adp8860_id[] = {
c7c06d8a
MH		 804 { "adp8860", adp8860 },
805 { "adp8861", adp8861 },
806 { "adp8863", adp8863 },
82fd53b7
MH		 807 { }
808};
809MODULE_DEVICE_TABLE(i2c, adp8860_id);
810
811static struct i2c_driver adp8860_driver = {
812 .driver = {
cf108b5c
JH		 813 .name = KBUILD_MODNAME,
814 .pm = &adp8860_i2c_pm_ops,
82fd53b7
MH		 815 },
816 .probe = adp8860_probe,
d1723fa2 817 .remove = adp8860_remove,
82fd53b7
MH		 818 .id_table = adp8860_id,
819};
820
81ce6864 821module_i2c_driver(adp8860_driver);
82fd53b7
MH		 822
823MODULE_LICENSE("GPL v2");
824MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
825MODULE_DESCRIPTION("ADP8860 Backlight driver");
Linux kernel - Deliverables
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