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Merge branch 'drm-nouveau-fixes-3.9' of git://anongit.freedesktop.org/git/nouveau...
[linux-2.6/libata-dev.git] / drivers / video / backlight / adp8870_bl.c
blob712c25a0d8fedc9ff26138a2224b488b037828f3
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 goto err;
278 }
279
280 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {
281 dev_err(&client->dev, "LED %d used by Backlight\n",
282 led_dat->id);
283 goto err;
284 }
285
286 led_dat->cdev.name = cur_led->name;
287 led_dat->cdev.default_trigger = cur_led->default_trigger;
288 led_dat->cdev.brightness_set = adp8870_led_set;
289 led_dat->cdev.brightness = LED_OFF;
290 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;
291 led_dat->client = client;
292 led_dat->new_brightness = LED_OFF;
293 INIT_WORK(&led_dat->work, adp8870_led_work);
294
295 ret = led_classdev_register(&client->dev, &led_dat->cdev);
296 if (ret) {
297 dev_err(&client->dev, "failed to register LED %d\n",
298 led_dat->id);
299 goto err;
300 }
301
302 ret = adp8870_led_setup(led_dat);
303 if (ret) {
304 dev_err(&client->dev, "failed to write\n");
305 i++;
306 goto err;
307 }
308 }
309
310 data->led = led;
311
312 return 0;
313
314 err:
315 for (i = i - 1; i >= 0; --i) {
316 led_classdev_unregister(&led[i].cdev);
317 cancel_work_sync(&led[i].work);
318 }
319
320 return ret;
321 }
322
323 static int adp8870_led_remove(struct i2c_client *client)
324 {
325 struct adp8870_backlight_platform_data *pdata =
326 client->dev.platform_data;
327 struct adp8870_bl *data = i2c_get_clientdata(client);
328 int i;
329
330 for (i = 0; i < pdata->num_leds; i++) {
331 led_classdev_unregister(&data->led[i].cdev);
332 cancel_work_sync(&data->led[i].work);
333 }
334
335 return 0;
336 }
337 #else
338 static int adp8870_led_probe(struct i2c_client *client)
339 {
340 return 0;
341 }
342
343 static int adp8870_led_remove(struct i2c_client *client)
344 {
345 return 0;
346 }
347 #endif
348
349 static int adp8870_bl_set(struct backlight_device *bl, int brightness)
350 {
351 struct adp8870_bl *data = bl_get_data(bl);
352 struct i2c_client *client = data->client;
353 int ret = 0;
354
355 if (data->pdata->en_ambl_sens) {
356 if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) {
357 /* Disable Ambient Light auto adjust */
358 ret = adp8870_clr_bits(client, ADP8870_MDCR,
359 CMP_AUTOEN);
360 if (ret)
361 return ret;
362 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
363 if (ret)
364 return ret;
365 } else {
366 /*
367 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
368 * restore daylight l1 sysfs brightness
369 */
370 ret = adp8870_write(client, ADP8870_BLMX1,
371 data->cached_daylight_max);
372 if (ret)
373 return ret;
374
375 ret = adp8870_set_bits(client, ADP8870_MDCR,
376 CMP_AUTOEN);
377 if (ret)
378 return ret;
379 }
380 } else {
381 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
382 if (ret)
383 return ret;
384 }
385
386 if (data->current_brightness && brightness == 0)
387 ret = adp8870_set_bits(client,
388 ADP8870_MDCR, DIM_EN);
389 else if (data->current_brightness == 0 && brightness)
390 ret = adp8870_clr_bits(client,
391 ADP8870_MDCR, DIM_EN);
392
393 if (!ret)
394 data->current_brightness = brightness;
395
396 return ret;
397 }
398
399 static int adp8870_bl_update_status(struct backlight_device *bl)
400 {
401 int brightness = bl->props.brightness;
402 if (bl->props.power != FB_BLANK_UNBLANK)
403 brightness = 0;
404
405 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
406 brightness = 0;
407
408 return adp8870_bl_set(bl, brightness);
409 }
410
411 static int adp8870_bl_get_brightness(struct backlight_device *bl)
412 {
413 struct adp8870_bl *data = bl_get_data(bl);
414
415 return data->current_brightness;
416 }
417
418 static const struct backlight_ops adp8870_bl_ops = {
419 .update_status = adp8870_bl_update_status,
420 .get_brightness = adp8870_bl_get_brightness,
421 };
422
423 static int adp8870_bl_setup(struct backlight_device *bl)
424 {
425 struct adp8870_bl *data = bl_get_data(bl);
426 struct i2c_client *client = data->client;
427 struct adp8870_backlight_platform_data *pdata = data->pdata;
428 int ret = 0;
429
430 ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign);
431 if (ret)
432 return ret;
433
434 ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign);
435 if (ret)
436 return ret;
437
438 ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max);
439 if (ret)
440 return ret;
441
442 ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim);
443 if (ret)
444 return ret;
445
446 if (pdata->en_ambl_sens) {
447 data->cached_daylight_max = pdata->l1_daylight_max;
448 ret = adp8870_write(client, ADP8870_BLMX2,
449 pdata->l2_bright_max);
450 if (ret)
451 return ret;
452 ret = adp8870_write(client, ADP8870_BLDM2,
453 pdata->l2_bright_dim);
454 if (ret)
455 return ret;
456
457 ret = adp8870_write(client, ADP8870_BLMX3,
458 pdata->l3_office_max);
459 if (ret)
460 return ret;
461 ret = adp8870_write(client, ADP8870_BLDM3,
462 pdata->l3_office_dim);
463 if (ret)
464 return ret;
465
466 ret = adp8870_write(client, ADP8870_BLMX4,
467 pdata->l4_indoor_max);
468 if (ret)
469 return ret;
470
471 ret = adp8870_write(client, ADP8870_BLDM4,
472 pdata->l4_indor_dim);
473 if (ret)
474 return ret;
475
476 ret = adp8870_write(client, ADP8870_BLMX5,
477 pdata->l5_dark_max);
478 if (ret)
479 return ret;
480
481 ret = adp8870_write(client, ADP8870_BLDM5,
482 pdata->l5_dark_dim);
483 if (ret)
484 return ret;
485
486 ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip);
487 if (ret)
488 return ret;
489
490 ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst);
491 if (ret)
492 return ret;
493
494 ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip);
495 if (ret)
496 return ret;
497
498 ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst);
499 if (ret)
500 return ret;
501
502 ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip);
503 if (ret)
504 return ret;
505
506 ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst);
507 if (ret)
508 return ret;
509
510 ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip);
511 if (ret)
512 return ret;
513
514 ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst);
515 if (ret)
516 return ret;
517
518 ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN |
519 L3_EN | L2_EN);
520 if (ret)
521 return ret;
522
523 ret = adp8870_write(client, ADP8870_CMP_CTL,
524 ALS_CMPR_CFG_VAL(pdata->abml_filt));
525 if (ret)
526 return ret;
527 }
528
529 ret = adp8870_write(client, ADP8870_CFGR,
530 BL_CFGR_VAL(pdata->bl_fade_law, 0));
531 if (ret)
532 return ret;
533
534 ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in,
535 pdata->bl_fade_out));
536 if (ret)
537 return ret;
538 /*
539 * ADP8870 Rev0 requires GDWN_DIS bit set
540 */
541
542 ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY |
543 (data->revid == 0 ? GDWN_DIS : 0));
544
545 return ret;
546 }
547
548 static ssize_t adp8870_show(struct device *dev, char *buf, int reg)
549 {
550 struct adp8870_bl *data = dev_get_drvdata(dev);
551 int error;
552 uint8_t reg_val;
553
554 mutex_lock(&data->lock);
555 error = adp8870_read(data->client, reg, &reg_val);
556 mutex_unlock(&data->lock);
557
558 if (error < 0)
559 return error;
560
561 return sprintf(buf, "%u\n", reg_val);
562 }
563
564 static ssize_t adp8870_store(struct device *dev, const char *buf,
565 size_t count, int reg)
566 {
567 struct adp8870_bl *data = dev_get_drvdata(dev);
568 unsigned long val;
569 int ret;
570
571 ret = kstrtoul(buf, 10, &val);
572 if (ret)
573 return ret;
574
575 mutex_lock(&data->lock);
576 adp8870_write(data->client, reg, val);
577 mutex_unlock(&data->lock);
578
579 return count;
580 }
581
582 static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev,
583 struct device_attribute *attr, char *buf)
584 {
585 return adp8870_show(dev, buf, ADP8870_BLMX5);
586 }
587
588 static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev,
589 struct device_attribute *attr, const char *buf, size_t count)
590 {
591 return adp8870_store(dev, buf, count, ADP8870_BLMX5);
592 }
593 static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show,
594 adp8870_bl_l5_dark_max_store);
595
596
597 static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev,
598 struct device_attribute *attr, char *buf)
599 {
600 return adp8870_show(dev, buf, ADP8870_BLMX4);
601 }
602
603 static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev,
604 struct device_attribute *attr, const char *buf, size_t count)
605 {
606 return adp8870_store(dev, buf, count, ADP8870_BLMX4);
607 }
608 static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show,
609 adp8870_bl_l4_indoor_max_store);
610
611
612 static ssize_t adp8870_bl_l3_office_max_show(struct device *dev,
613 struct device_attribute *attr, char *buf)
614 {
615 return adp8870_show(dev, buf, ADP8870_BLMX3);
616 }
617
618 static ssize_t adp8870_bl_l3_office_max_store(struct device *dev,
619 struct device_attribute *attr, const char *buf, size_t count)
620 {
621 return adp8870_store(dev, buf, count, ADP8870_BLMX3);
622 }
623
624 static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show,
625 adp8870_bl_l3_office_max_store);
626
627 static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev,
628 struct device_attribute *attr, char *buf)
629 {
630 return adp8870_show(dev, buf, ADP8870_BLMX2);
631 }
632
633 static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev,
634 struct device_attribute *attr, const char *buf, size_t count)
635 {
636 return adp8870_store(dev, buf, count, ADP8870_BLMX2);
637 }
638 static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show,
639 adp8870_bl_l2_bright_max_store);
640
641 static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev,
642 struct device_attribute *attr, char *buf)
643 {
644 return adp8870_show(dev, buf, ADP8870_BLMX1);
645 }
646
647 static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev,
648 struct device_attribute *attr, const char *buf, size_t count)
649 {
650 struct adp8870_bl *data = dev_get_drvdata(dev);
651 int ret = kstrtoul(buf, 10, &data->cached_daylight_max);
652 if (ret)
653 return ret;
654
655 return adp8870_store(dev, buf, count, ADP8870_BLMX1);
656 }
657 static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show,
658 adp8870_bl_l1_daylight_max_store);
659
660 static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev,
661 struct device_attribute *attr, char *buf)
662 {
663 return adp8870_show(dev, buf, ADP8870_BLDM5);
664 }
665
666 static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev,
667 struct device_attribute *attr,
668 const char *buf, size_t count)
669 {
670 return adp8870_store(dev, buf, count, ADP8870_BLDM5);
671 }
672 static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show,
673 adp8870_bl_l5_dark_dim_store);
674
675 static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev,
676 struct device_attribute *attr, char *buf)
677 {
678 return adp8870_show(dev, buf, ADP8870_BLDM4);
679 }
680
681 static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev,
682 struct device_attribute *attr,
683 const char *buf, size_t count)
684 {
685 return adp8870_store(dev, buf, count, ADP8870_BLDM4);
686 }
687 static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show,
688 adp8870_bl_l4_indoor_dim_store);
689
690
691 static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev,
692 struct device_attribute *attr, char *buf)
693 {
694 return adp8870_show(dev, buf, ADP8870_BLDM3);
695 }
696
697 static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev,
698 struct device_attribute *attr,
699 const char *buf, size_t count)
700 {
701 return adp8870_store(dev, buf, count, ADP8870_BLDM3);
702 }
703 static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show,
704 adp8870_bl_l3_office_dim_store);
705
706 static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev,
707 struct device_attribute *attr, char *buf)
708 {
709 return adp8870_show(dev, buf, ADP8870_BLDM2);
710 }
711
712 static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev,
713 struct device_attribute *attr,
714 const char *buf, size_t count)
715 {
716 return adp8870_store(dev, buf, count, ADP8870_BLDM2);
717 }
718 static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show,
719 adp8870_bl_l2_bright_dim_store);
720
721 static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev,
722 struct device_attribute *attr, char *buf)
723 {
724 return adp8870_show(dev, buf, ADP8870_BLDM1);
725 }
726
727 static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev,
728 struct device_attribute *attr,
729 const char *buf, size_t count)
730 {
731 return adp8870_store(dev, buf, count, ADP8870_BLDM1);
732 }
733 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show,
734 adp8870_bl_l1_daylight_dim_store);
735
736 #ifdef ADP8870_EXT_FEATURES
737 static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev,
738 struct device_attribute *attr, char *buf)
739 {
740 struct adp8870_bl *data = dev_get_drvdata(dev);
741 int error;
742 uint8_t reg_val;
743 uint16_t ret_val;
744
745 mutex_lock(&data->lock);
746 error = adp8870_read(data->client, ADP8870_PH1LEVL, &reg_val);
747 if (error < 0) {
748 mutex_unlock(&data->lock);
749 return error;
750 }
751 ret_val = reg_val;
752 error = adp8870_read(data->client, ADP8870_PH1LEVH, &reg_val);
753 mutex_unlock(&data->lock);
754
755 if (error < 0)
756 return error;
757
758 /* Return 13-bit conversion value for the first light sensor */
759 ret_val += (reg_val & 0x1F) << 8;
760
761 return sprintf(buf, "%u\n", ret_val);
762 }
763 static DEVICE_ATTR(ambient_light_level, 0444,
764 adp8870_bl_ambient_light_level_show, NULL);
765
766 static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev,
767 struct device_attribute *attr, char *buf)
768 {
769 struct adp8870_bl *data = dev_get_drvdata(dev);
770 int error;
771 uint8_t reg_val;
772
773 mutex_lock(&data->lock);
774 error = adp8870_read(data->client, ADP8870_CFGR, &reg_val);
775 mutex_unlock(&data->lock);
776
777 if (error < 0)
778 return error;
779
780 return sprintf(buf, "%u\n",
781 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
782 }
783
784 static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
785 struct device_attribute *attr,
786 const char *buf, size_t count)
787 {
788 struct adp8870_bl *data = dev_get_drvdata(dev);
789 unsigned long val;
790 uint8_t reg_val;
791 int ret;
792
793 ret = kstrtoul(buf, 10, &val);
794 if (ret)
795 return ret;
796
797 if (val == 0) {
798 /* Enable automatic ambient light sensing */
799 adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
800 } else if ((val > 0) && (val < 6)) {
801 /* Disable automatic ambient light sensing */
802 adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
803
804 /* Set user supplied ambient light zone */
805 mutex_lock(&data->lock);
806 adp8870_read(data->client, ADP8870_CFGR, &reg_val);
807 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
808 reg_val |= (val - 1) << CFGR_BLV_SHIFT;
809 adp8870_write(data->client, ADP8870_CFGR, reg_val);
810 mutex_unlock(&data->lock);
811 }
812
813 return count;
814 }
815 static DEVICE_ATTR(ambient_light_zone, 0664,
816 adp8870_bl_ambient_light_zone_show,
817 adp8870_bl_ambient_light_zone_store);
818 #endif
819
820 static struct attribute *adp8870_bl_attributes[] = {
821 &dev_attr_l5_dark_max.attr,
822 &dev_attr_l5_dark_dim.attr,
823 &dev_attr_l4_indoor_max.attr,
824 &dev_attr_l4_indoor_dim.attr,
825 &dev_attr_l3_office_max.attr,
826 &dev_attr_l3_office_dim.attr,
827 &dev_attr_l2_bright_max.attr,
828 &dev_attr_l2_bright_dim.attr,
829 &dev_attr_l1_daylight_max.attr,
830 &dev_attr_l1_daylight_dim.attr,
831 #ifdef ADP8870_EXT_FEATURES
832 &dev_attr_ambient_light_level.attr,
833 &dev_attr_ambient_light_zone.attr,
834 #endif
835 NULL
836 };
837
838 static const struct attribute_group adp8870_bl_attr_group = {
839 .attrs = adp8870_bl_attributes,
840 };
841
842 static int adp8870_probe(struct i2c_client *client,
843 const struct i2c_device_id *id)
844 {
845 struct backlight_properties props;
846 struct backlight_device *bl;
847 struct adp8870_bl *data;
848 struct adp8870_backlight_platform_data *pdata =
849 client->dev.platform_data;
850 uint8_t reg_val;
851 int ret;
852
853 if (!i2c_check_functionality(client->adapter,
854 I2C_FUNC_SMBUS_BYTE_DATA)) {
855 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
856 return -EIO;
857 }
858
859 if (!pdata) {
860 dev_err(&client->dev, "no platform data?\n");
861 return -EINVAL;
862 }
863
864 ret = adp8870_read(client, ADP8870_MFDVID, &reg_val);
865 if (ret < 0)
866 return -EIO;
867
868 if (ADP8870_MANID(reg_val) != ADP8870_MANUFID) {
869 dev_err(&client->dev, "failed to probe\n");
870 return -ENODEV;
871 }
872
873 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
874 if (data == NULL)
875 return -ENOMEM;
876
877 data->revid = ADP8870_DEVID(reg_val);
878 data->client = client;
879 data->pdata = pdata;
880 data->id = id->driver_data;
881 data->current_brightness = 0;
882 i2c_set_clientdata(client, data);
883
884 mutex_init(&data->lock);
885
886 memset(&props, 0, sizeof(props));
887 props.type = BACKLIGHT_RAW;
888 props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS;
889 bl = backlight_device_register(dev_driver_string(&client->dev),
890 &client->dev, data, &adp8870_bl_ops, &props);
891 if (IS_ERR(bl)) {
892 dev_err(&client->dev, "failed to register backlight\n");
893 return PTR_ERR(bl);
894 }
895
896 data->bl = bl;
897
898 if (pdata->en_ambl_sens)
899 ret = sysfs_create_group(&bl->dev.kobj,
900 &adp8870_bl_attr_group);
901
902 if (ret) {
903 dev_err(&client->dev, "failed to register sysfs\n");
904 goto out1;
905 }
906
907 ret = adp8870_bl_setup(bl);
908 if (ret) {
909 ret = -EIO;
910 goto out;
911 }
912
913 backlight_update_status(bl);
914
915 dev_info(&client->dev, "Rev.%d Backlight\n", data->revid);
916
917 if (pdata->num_leds)
918 adp8870_led_probe(client);
919
920 return 0;
921
922 out:
923 if (data->pdata->en_ambl_sens)
924 sysfs_remove_group(&data->bl->dev.kobj,
925 &adp8870_bl_attr_group);
926 out1:
927 backlight_device_unregister(bl);
928
929 return ret;
930 }
931
932 static int adp8870_remove(struct i2c_client *client)
933 {
934 struct adp8870_bl *data = i2c_get_clientdata(client);
935
936 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
937
938 if (data->led)
939 adp8870_led_remove(client);
940
941 if (data->pdata->en_ambl_sens)
942 sysfs_remove_group(&data->bl->dev.kobj,
943 &adp8870_bl_attr_group);
944
945 backlight_device_unregister(data->bl);
946
947 return 0;
948 }
949
950 #ifdef CONFIG_PM
951 static int adp8870_i2c_suspend(struct i2c_client *client, pm_message_t message)
952 {
953 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
954
955 return 0;
956 }
957
958 static int adp8870_i2c_resume(struct i2c_client *client)
959 {
960 adp8870_set_bits(client, ADP8870_MDCR, NSTBY | BLEN);
961
962 return 0;
963 }
964 #else
965 #define adp8870_i2c_suspend NULL
966 #define adp8870_i2c_resume NULL
967 #endif
968
969 static const struct i2c_device_id adp8870_id[] = {
970 { "adp8870", 0 },
971 { }
972 };
973 MODULE_DEVICE_TABLE(i2c, adp8870_id);
974
975 static struct i2c_driver adp8870_driver = {
976 .driver = {
977 .name = KBUILD_MODNAME,
978 },
979 .probe = adp8870_probe,
980 .remove = adp8870_remove,
981 .suspend = adp8870_i2c_suspend,
982 .resume = adp8870_i2c_resume,
983 .id_table = adp8870_id,
984 };
985
986 module_i2c_driver(adp8870_driver);
987
988 MODULE_LICENSE("GPL v2");
989 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
990 MODULE_DESCRIPTION("ADP8870 Backlight driver");
991 MODULE_ALIAS("i2c:adp8870-backlight");
Linux 2.6 libata-dev (mirror)