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Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / video / backlight / adp8870_bl.c
1 /*
2 * Backlight driver for Analog Devices ADP8870 Backlight Devices
3 *
4 * Copyright 2009-2011 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9 #include <linux/module.h>
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>
18 #include <linux/workqueue.h>
19 #include <linux/slab.h>
20
21 #include <linux/i2c/adp8870.h>
22 #define ADP8870_EXT_FEATURES
23 #define ADP8870_USE_LEDS
24
25
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 */
79
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)
83
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)
92 #define BLEN (1 << 0)
93
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)
99
100 #define CFGR_BLV_SHIFT 3
101 #define CFGR_BLV_MASK 0x7
102 #define ADP8870_FLAG_LED_MASK 0xFF
103
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)
107
108 struct adp8870_bl {
109 struct i2c_client *client;
110 struct backlight_device *bl;
111 struct adp8870_led *led;
112 struct adp8870_backlight_platform_data *pdata;
113 struct mutex lock;
114 unsigned long cached_daylight_max;
115 int id;
116 int revid;
117 int current_brightness;
118 };
119
120 struct adp8870_led {
121 struct led_classdev cdev;
122 struct work_struct work;
123 struct i2c_client *client;
124 enum led_brightness new_brightness;
125 int id;
126 int flags;
127 };
128
129 static int adp8870_read(struct i2c_client *client, int reg, uint8_t *val)
130 {
131 int ret;
132
133 ret = i2c_smbus_read_byte_data(client, reg);
134 if (ret < 0) {
135 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
136 return ret;
137 }
138
139 *val = ret;
140 return 0;
141 }
142
143
144 static int adp8870_write(struct i2c_client *client, u8 reg, u8 val)
145 {
146 int ret = i2c_smbus_write_byte_data(client, reg, val);
147 if (ret)
148 dev_err(&client->dev, "failed to write\n");
149
150 return ret;
151 }
152
153 static int adp8870_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
154 {
155 struct adp8870_bl *data = i2c_get_clientdata(client);
156 uint8_t reg_val;
157 int ret;
158
159 mutex_lock(&data->lock);
160
161 ret = adp8870_read(client, reg, &reg_val);
162
163 if (!ret && ((reg_val & bit_mask) != bit_mask)) {
164 reg_val |= bit_mask;
165 ret = adp8870_write(client, reg, reg_val);
166 }
167
168 mutex_unlock(&data->lock);
169 return ret;
170 }
171
172 static int adp8870_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
173 {
174 struct adp8870_bl *data = i2c_get_clientdata(client);
175 uint8_t reg_val;
176 int ret;
177
178 mutex_lock(&data->lock);
179
180 ret = adp8870_read(client, reg, &reg_val);
181
182 if (!ret && (reg_val & bit_mask)) {
183 reg_val &= ~bit_mask;
184 ret = adp8870_write(client, reg, reg_val);
185 }
186
187 mutex_unlock(&data->lock);
188 return ret;
189 }
190
191 /*
192 * Independent sink / LED
193 */
194 #if defined(ADP8870_USE_LEDS)
195 static void adp8870_led_work(struct work_struct *work)
196 {
197 struct adp8870_led *led = container_of(work, struct adp8870_led, work);
198 adp8870_write(led->client, ADP8870_ISC1 + led->id - 1,
199 led->new_brightness >> 1);
200 }
201
202 static void adp8870_led_set(struct led_classdev *led_cdev,
203 enum led_brightness value)
204 {
205 struct adp8870_led *led;
206
207 led = container_of(led_cdev, struct adp8870_led, cdev);
208 led->new_brightness = value;
209 /*
210 * Use workqueue for IO since I2C operations can sleep.
211 */
212 schedule_work(&led->work);
213 }
214
215 static int adp8870_led_setup(struct adp8870_led *led)
216 {
217 struct i2c_client *client = led->client;
218 int ret = 0;
219
220 ret = adp8870_write(client, ADP8870_ISC1 + led->id - 1, 0);
221 if (ret)
222 return ret;
223
224 ret = adp8870_set_bits(client, ADP8870_ISCC, 1 << (led->id - 1));
225 if (ret)
226 return ret;
227
228 if (led->id > 4)
229 ret = adp8870_set_bits(client, ADP8870_ISCT1,
230 (led->flags & 0x3) << ((led->id - 5) * 2));
231 else
232 ret = adp8870_set_bits(client, ADP8870_ISCT2,
233 (led->flags & 0x3) << ((led->id - 1) * 2));
234
235 return ret;
236 }
237
238 static int adp8870_led_probe(struct i2c_client *client)
239 {
240 struct adp8870_backlight_platform_data *pdata =
241 client->dev.platform_data;
242 struct adp8870_bl *data = i2c_get_clientdata(client);
243 struct adp8870_led *led, *led_dat;
244 struct led_info *cur_led;
245 int ret, i;
246
247 led = devm_kzalloc(&client->dev, pdata->num_leds * sizeof(*led),
248 GFP_KERNEL);
249 if (led == NULL) {
250 dev_err(&client->dev, "failed to alloc memory\n");
251 return -ENOMEM;
252 }
253
254 ret = adp8870_write(client, ADP8870_ISCLAW, pdata->led_fade_law);
255 if (ret)
256 return ret;
257
258 ret = adp8870_write(client, ADP8870_ISCT1,
259 (pdata->led_on_time & 0x3) << 6);
260 if (ret)
261 return ret;
262
263 ret = adp8870_write(client, ADP8870_ISCF,
264 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
265 if (ret)
266 return ret;
267
268 for (i = 0; i < pdata->num_leds; ++i) {
269 cur_led = &pdata->leds[i];
270 led_dat = &led[i];
271
272 led_dat->id = cur_led->flags & ADP8870_FLAG_LED_MASK;
273
274 if (led_dat->id > 7 || led_dat->id < 1) {
275 dev_err(&client->dev, "Invalid LED ID %d\n",
276 led_dat->id);
277 ret = -EINVAL;
278 goto err;
279 }
280
281 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {
282 dev_err(&client->dev, "LED %d used by Backlight\n",
283 led_dat->id);
284 ret = -EBUSY;
285 goto err;
286 }
287
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);
296
297 ret = led_classdev_register(&client->dev, &led_dat->cdev);
298 if (ret) {
299 dev_err(&client->dev, "failed to register LED %d\n",
300 led_dat->id);
301 goto err;
302 }
303
304 ret = adp8870_led_setup(led_dat);
305 if (ret) {
306 dev_err(&client->dev, "failed to write\n");
307 i++;
308 goto err;
309 }
310 }
311
312 data->led = led;
313
314 return 0;
315
316 err:
317 for (i = i - 1; i >= 0; --i) {
318 led_classdev_unregister(&led[i].cdev);
319 cancel_work_sync(&led[i].work);
320 }
321
322 return ret;
323 }
324
325 static int adp8870_led_remove(struct i2c_client *client)
326 {
327 struct adp8870_backlight_platform_data *pdata =
328 client->dev.platform_data;
329 struct adp8870_bl *data = i2c_get_clientdata(client);
330 int i;
331
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);
335 }
336
337 return 0;
338 }
339 #else
340 static int adp8870_led_probe(struct i2c_client *client)
341 {
342 return 0;
343 }
344
345 static int adp8870_led_remove(struct i2c_client *client)
346 {
347 return 0;
348 }
349 #endif
350
351 static int adp8870_bl_set(struct backlight_device *bl, int brightness)
352 {
353 struct adp8870_bl *data = bl_get_data(bl);
354 struct i2c_client *client = data->client;
355 int ret = 0;
356
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,
361 CMP_AUTOEN);
362 if (ret)
363 return ret;
364 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
365 if (ret)
366 return ret;
367 } else {
368 /*
369 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
370 * restore daylight l1 sysfs brightness
371 */
372 ret = adp8870_write(client, ADP8870_BLMX1,
373 data->cached_daylight_max);
374 if (ret)
375 return ret;
376
377 ret = adp8870_set_bits(client, ADP8870_MDCR,
378 CMP_AUTOEN);
379 if (ret)
380 return ret;
381 }
382 } else {
383 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
384 if (ret)
385 return ret;
386 }
387
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);
394
395 if (!ret)
396 data->current_brightness = brightness;
397
398 return ret;
399 }
400
401 static int adp8870_bl_update_status(struct backlight_device *bl)
402 {
403 int brightness = bl->props.brightness;
404 if (bl->props.power != FB_BLANK_UNBLANK)
405 brightness = 0;
406
407 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
408 brightness = 0;
409
410 return adp8870_bl_set(bl, brightness);
411 }
412
413 static int adp8870_bl_get_brightness(struct backlight_device *bl)
414 {
415 struct adp8870_bl *data = bl_get_data(bl);
416
417 return data->current_brightness;
418 }
419
420 static const struct backlight_ops adp8870_bl_ops = {
421 .update_status = adp8870_bl_update_status,
422 .get_brightness = adp8870_bl_get_brightness,
423 };
424
425 static int adp8870_bl_setup(struct backlight_device *bl)
426 {
427 struct adp8870_bl *data = bl_get_data(bl);
428 struct i2c_client *client = data->client;
429 struct adp8870_backlight_platform_data *pdata = data->pdata;
430 int ret = 0;
431
432 ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign);
433 if (ret)
434 return ret;
435
436 ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign);
437 if (ret)
438 return ret;
439
440 ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max);
441 if (ret)
442 return ret;
443
444 ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim);
445 if (ret)
446 return ret;
447
448 if (pdata->en_ambl_sens) {
449 data->cached_daylight_max = pdata->l1_daylight_max;
450 ret = adp8870_write(client, ADP8870_BLMX2,
451 pdata->l2_bright_max);
452 if (ret)
453 return ret;
454 ret = adp8870_write(client, ADP8870_BLDM2,
455 pdata->l2_bright_dim);
456 if (ret)
457 return ret;
458
459 ret = adp8870_write(client, ADP8870_BLMX3,
460 pdata->l3_office_max);
461 if (ret)
462 return ret;
463 ret = adp8870_write(client, ADP8870_BLDM3,
464 pdata->l3_office_dim);
465 if (ret)
466 return ret;
467
468 ret = adp8870_write(client, ADP8870_BLMX4,
469 pdata->l4_indoor_max);
470 if (ret)
471 return ret;
472
473 ret = adp8870_write(client, ADP8870_BLDM4,
474 pdata->l4_indor_dim);
475 if (ret)
476 return ret;
477
478 ret = adp8870_write(client, ADP8870_BLMX5,
479 pdata->l5_dark_max);
480 if (ret)
481 return ret;
482
483 ret = adp8870_write(client, ADP8870_BLDM5,
484 pdata->l5_dark_dim);
485 if (ret)
486 return ret;
487
488 ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip);
489 if (ret)
490 return ret;
491
492 ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst);
493 if (ret)
494 return ret;
495
496 ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip);
497 if (ret)
498 return ret;
499
500 ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst);
501 if (ret)
502 return ret;
503
504 ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip);
505 if (ret)
506 return ret;
507
508 ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst);
509 if (ret)
510 return ret;
511
512 ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip);
513 if (ret)
514 return ret;
515
516 ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst);
517 if (ret)
518 return ret;
519
520 ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN |
521 L3_EN | L2_EN);
522 if (ret)
523 return ret;
524
525 ret = adp8870_write(client, ADP8870_CMP_CTL,
526 ALS_CMPR_CFG_VAL(pdata->abml_filt));
527 if (ret)
528 return ret;
529 }
530
531 ret = adp8870_write(client, ADP8870_CFGR,
532 BL_CFGR_VAL(pdata->bl_fade_law, 0));
533 if (ret)
534 return ret;
535
536 ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in,
537 pdata->bl_fade_out));
538 if (ret)
539 return ret;
540 /*
541 * ADP8870 Rev0 requires GDWN_DIS bit set
542 */
543
544 ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY |
545 (data->revid == 0 ? GDWN_DIS : 0));
546
547 return ret;
548 }
549
550 static ssize_t adp8870_show(struct device *dev, char *buf, int reg)
551 {
552 struct adp8870_bl *data = dev_get_drvdata(dev);
553 int error;
554 uint8_t reg_val;
555
556 mutex_lock(&data->lock);
557 error = adp8870_read(data->client, reg, &reg_val);
558 mutex_unlock(&data->lock);
559
560 if (error < 0)
561 return error;
562
563 return sprintf(buf, "%u\n", reg_val);
564 }
565
566 static ssize_t adp8870_store(struct device *dev, const char *buf,
567 size_t count, int reg)
568 {
569 struct adp8870_bl *data = dev_get_drvdata(dev);
570 unsigned long val;
571 int ret;
572
573 ret = kstrtoul(buf, 10, &val);
574 if (ret)
575 return ret;
576
577 mutex_lock(&data->lock);
578 adp8870_write(data->client, reg, val);
579 mutex_unlock(&data->lock);
580
581 return count;
582 }
583
584 static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev,
585 struct device_attribute *attr, char *buf)
586 {
587 return adp8870_show(dev, buf, ADP8870_BLMX5);
588 }
589
590 static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev,
591 struct device_attribute *attr, const char *buf, size_t count)
592 {
593 return adp8870_store(dev, buf, count, ADP8870_BLMX5);
594 }
595 static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show,
596 adp8870_bl_l5_dark_max_store);
597
598
599 static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev,
600 struct device_attribute *attr, char *buf)
601 {
602 return adp8870_show(dev, buf, ADP8870_BLMX4);
603 }
604
605 static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev,
606 struct device_attribute *attr, const char *buf, size_t count)
607 {
608 return adp8870_store(dev, buf, count, ADP8870_BLMX4);
609 }
610 static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show,
611 adp8870_bl_l4_indoor_max_store);
612
613
614 static ssize_t adp8870_bl_l3_office_max_show(struct device *dev,
615 struct device_attribute *attr, char *buf)
616 {
617 return adp8870_show(dev, buf, ADP8870_BLMX3);
618 }
619
620 static ssize_t adp8870_bl_l3_office_max_store(struct device *dev,
621 struct device_attribute *attr, const char *buf, size_t count)
622 {
623 return adp8870_store(dev, buf, count, ADP8870_BLMX3);
624 }
625
626 static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show,
627 adp8870_bl_l3_office_max_store);
628
629 static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev,
630 struct device_attribute *attr, char *buf)
631 {
632 return adp8870_show(dev, buf, ADP8870_BLMX2);
633 }
634
635 static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev,
636 struct device_attribute *attr, const char *buf, size_t count)
637 {
638 return adp8870_store(dev, buf, count, ADP8870_BLMX2);
639 }
640 static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show,
641 adp8870_bl_l2_bright_max_store);
642
643 static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev,
644 struct device_attribute *attr, char *buf)
645 {
646 return adp8870_show(dev, buf, ADP8870_BLMX1);
647 }
648
649 static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev,
650 struct device_attribute *attr, const char *buf, size_t count)
651 {
652 struct adp8870_bl *data = dev_get_drvdata(dev);
653 int ret = kstrtoul(buf, 10, &data->cached_daylight_max);
654 if (ret)
655 return ret;
656
657 return adp8870_store(dev, buf, count, ADP8870_BLMX1);
658 }
659 static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show,
660 adp8870_bl_l1_daylight_max_store);
661
662 static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev,
663 struct device_attribute *attr, char *buf)
664 {
665 return adp8870_show(dev, buf, ADP8870_BLDM5);
666 }
667
668 static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev,
669 struct device_attribute *attr,
670 const char *buf, size_t count)
671 {
672 return adp8870_store(dev, buf, count, ADP8870_BLDM5);
673 }
674 static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show,
675 adp8870_bl_l5_dark_dim_store);
676
677 static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev,
678 struct device_attribute *attr, char *buf)
679 {
680 return adp8870_show(dev, buf, ADP8870_BLDM4);
681 }
682
683 static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev,
684 struct device_attribute *attr,
685 const char *buf, size_t count)
686 {
687 return adp8870_store(dev, buf, count, ADP8870_BLDM4);
688 }
689 static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show,
690 adp8870_bl_l4_indoor_dim_store);
691
692
693 static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev,
694 struct device_attribute *attr, char *buf)
695 {
696 return adp8870_show(dev, buf, ADP8870_BLDM3);
697 }
698
699 static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev,
700 struct device_attribute *attr,
701 const char *buf, size_t count)
702 {
703 return adp8870_store(dev, buf, count, ADP8870_BLDM3);
704 }
705 static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show,
706 adp8870_bl_l3_office_dim_store);
707
708 static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev,
709 struct device_attribute *attr, char *buf)
710 {
711 return adp8870_show(dev, buf, ADP8870_BLDM2);
712 }
713
714 static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev,
715 struct device_attribute *attr,
716 const char *buf, size_t count)
717 {
718 return adp8870_store(dev, buf, count, ADP8870_BLDM2);
719 }
720 static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show,
721 adp8870_bl_l2_bright_dim_store);
722
723 static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev,
724 struct device_attribute *attr, char *buf)
725 {
726 return adp8870_show(dev, buf, ADP8870_BLDM1);
727 }
728
729 static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev,
730 struct device_attribute *attr,
731 const char *buf, size_t count)
732 {
733 return adp8870_store(dev, buf, count, ADP8870_BLDM1);
734 }
735 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show,
736 adp8870_bl_l1_daylight_dim_store);
737
738 #ifdef ADP8870_EXT_FEATURES
739 static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev,
740 struct device_attribute *attr, char *buf)
741 {
742 struct adp8870_bl *data = dev_get_drvdata(dev);
743 int error;
744 uint8_t reg_val;
745 uint16_t ret_val;
746
747 mutex_lock(&data->lock);
748 error = adp8870_read(data->client, ADP8870_PH1LEVL, &reg_val);
749 if (error < 0) {
750 mutex_unlock(&data->lock);
751 return error;
752 }
753 ret_val = reg_val;
754 error = adp8870_read(data->client, ADP8870_PH1LEVH, &reg_val);
755 mutex_unlock(&data->lock);
756
757 if (error < 0)
758 return error;
759
760 /* Return 13-bit conversion value for the first light sensor */
761 ret_val += (reg_val & 0x1F) << 8;
762
763 return sprintf(buf, "%u\n", ret_val);
764 }
765 static DEVICE_ATTR(ambient_light_level, 0444,
766 adp8870_bl_ambient_light_level_show, NULL);
767
768 static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev,
769 struct device_attribute *attr, char *buf)
770 {
771 struct adp8870_bl *data = dev_get_drvdata(dev);
772 int error;
773 uint8_t reg_val;
774
775 mutex_lock(&data->lock);
776 error = adp8870_read(data->client, ADP8870_CFGR, &reg_val);
777 mutex_unlock(&data->lock);
778
779 if (error < 0)
780 return error;
781
782 return sprintf(buf, "%u\n",
783 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
784 }
785
786 static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
787 struct device_attribute *attr,
788 const char *buf, size_t count)
789 {
790 struct adp8870_bl *data = dev_get_drvdata(dev);
791 unsigned long val;
792 uint8_t reg_val;
793 int ret;
794
795 ret = kstrtoul(buf, 10, &val);
796 if (ret)
797 return ret;
798
799 if (val == 0) {
800 /* Enable automatic ambient light sensing */
801 adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
802 } else if ((val > 0) && (val < 6)) {
803 /* Disable automatic ambient light sensing */
804 adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
805
806 /* Set user supplied ambient light zone */
807 mutex_lock(&data->lock);
808 adp8870_read(data->client, ADP8870_CFGR, &reg_val);
809 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
810 reg_val |= (val - 1) << CFGR_BLV_SHIFT;
811 adp8870_write(data->client, ADP8870_CFGR, reg_val);
812 mutex_unlock(&data->lock);
813 }
814
815 return count;
816 }
817 static DEVICE_ATTR(ambient_light_zone, 0664,
818 adp8870_bl_ambient_light_zone_show,
819 adp8870_bl_ambient_light_zone_store);
820 #endif
821
822 static struct attribute *adp8870_bl_attributes[] = {
823 &dev_attr_l5_dark_max.attr,
824 &dev_attr_l5_dark_dim.attr,
825 &dev_attr_l4_indoor_max.attr,
826 &dev_attr_l4_indoor_dim.attr,
827 &dev_attr_l3_office_max.attr,
828 &dev_attr_l3_office_dim.attr,
829 &dev_attr_l2_bright_max.attr,
830 &dev_attr_l2_bright_dim.attr,
831 &dev_attr_l1_daylight_max.attr,
832 &dev_attr_l1_daylight_dim.attr,
833 #ifdef ADP8870_EXT_FEATURES
834 &dev_attr_ambient_light_level.attr,
835 &dev_attr_ambient_light_zone.attr,
836 #endif
837 NULL
838 };
839
840 static const struct attribute_group adp8870_bl_attr_group = {
841 .attrs = adp8870_bl_attributes,
842 };
843
844 static int adp8870_probe(struct i2c_client *client,
845 const struct i2c_device_id *id)
846 {
847 struct backlight_properties props;
848 struct backlight_device *bl;
849 struct adp8870_bl *data;
850 struct adp8870_backlight_platform_data *pdata =
851 client->dev.platform_data;
852 uint8_t reg_val;
853 int ret;
854
855 if (!i2c_check_functionality(client->adapter,
856 I2C_FUNC_SMBUS_BYTE_DATA)) {
857 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
858 return -EIO;
859 }
860
861 if (!pdata) {
862 dev_err(&client->dev, "no platform data?\n");
863 return -EINVAL;
864 }
865
866 ret = adp8870_read(client, ADP8870_MFDVID, &reg_val);
867 if (ret < 0)
868 return -EIO;
869
870 if (ADP8870_MANID(reg_val) != ADP8870_MANUFID) {
871 dev_err(&client->dev, "failed to probe\n");
872 return -ENODEV;
873 }
874
875 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
876 if (data == NULL)
877 return -ENOMEM;
878
879 data->revid = ADP8870_DEVID(reg_val);
880 data->client = client;
881 data->pdata = pdata;
882 data->id = id->driver_data;
883 data->current_brightness = 0;
884 i2c_set_clientdata(client, data);
885
886 mutex_init(&data->lock);
887
888 memset(&props, 0, sizeof(props));
889 props.type = BACKLIGHT_RAW;
890 props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS;
891 bl = backlight_device_register(dev_driver_string(&client->dev),
892 &client->dev, data, &adp8870_bl_ops, &props);
893 if (IS_ERR(bl)) {
894 dev_err(&client->dev, "failed to register backlight\n");
895 return PTR_ERR(bl);
896 }
897
898 data->bl = bl;
899
900 if (pdata->en_ambl_sens) {
901 ret = sysfs_create_group(&bl->dev.kobj,
902 &adp8870_bl_attr_group);
903 if (ret) {
904 dev_err(&client->dev, "failed to register sysfs\n");
905 goto out1;
906 }
907 }
908
909 ret = adp8870_bl_setup(bl);
910 if (ret) {
911 ret = -EIO;
912 goto out;
913 }
914
915 backlight_update_status(bl);
916
917 dev_info(&client->dev, "Rev.%d Backlight\n", data->revid);
918
919 if (pdata->num_leds)
920 adp8870_led_probe(client);
921
922 return 0;
923
924 out:
925 if (data->pdata->en_ambl_sens)
926 sysfs_remove_group(&data->bl->dev.kobj,
927 &adp8870_bl_attr_group);
928 out1:
929 backlight_device_unregister(bl);
930
931 return ret;
932 }
933
934 static int adp8870_remove(struct i2c_client *client)
935 {
936 struct adp8870_bl *data = i2c_get_clientdata(client);
937
938 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
939
940 if (data->led)
941 adp8870_led_remove(client);
942
943 if (data->pdata->en_ambl_sens)
944 sysfs_remove_group(&data->bl->dev.kobj,
945 &adp8870_bl_attr_group);
946
947 backlight_device_unregister(data->bl);
948
949 return 0;
950 }
951
952 #ifdef CONFIG_PM_SLEEP
953 static int adp8870_i2c_suspend(struct device *dev)
954 {
955 struct i2c_client *client = to_i2c_client(dev);
956
957 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
958
959 return 0;
960 }
961
962 static int adp8870_i2c_resume(struct device *dev)
963 {
964 struct i2c_client *client = to_i2c_client(dev);
965
966 adp8870_set_bits(client, ADP8870_MDCR, NSTBY | BLEN);
967
968 return 0;
969 }
970 #endif
971
972 static SIMPLE_DEV_PM_OPS(adp8870_i2c_pm_ops, adp8870_i2c_suspend,
973 adp8870_i2c_resume);
974
975 static const struct i2c_device_id adp8870_id[] = {
976 { "adp8870", 0 },
977 { }
978 };
979 MODULE_DEVICE_TABLE(i2c, adp8870_id);
980
981 static struct i2c_driver adp8870_driver = {
982 .driver = {
983 .name = KBUILD_MODNAME,
984 .pm = &adp8870_i2c_pm_ops,
985 },
986 .probe = adp8870_probe,
987 .remove = adp8870_remove,
988 .id_table = adp8870_id,
989 };
990
991 module_i2c_driver(adp8870_driver);
992
993 MODULE_LICENSE("GPL v2");
994 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
995 MODULE_DESCRIPTION("ADP8870 Backlight driver");
996 MODULE_ALIAS("i2c:adp8870-backlight");
Linux kernel - Deliverables
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