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scsi: use per-cpu buffer for formatting scsi_print_result()
[linux/fpc-iii.git] / drivers / video / backlight / adp8870_bl.c
blob037e430833435457381f2c282b3839e2a8964dc5
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
148 if (ret)
149 dev_err(&client->dev, "failed to write\n");
150
151 return ret;
152 }
153
154 static int adp8870_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
155 {
156 struct adp8870_bl *data = i2c_get_clientdata(client);
157 uint8_t reg_val;
158 int ret;
159
160 mutex_lock(&data->lock);
161
162 ret = adp8870_read(client, reg, &reg_val);
163
164 if (!ret && ((reg_val & bit_mask) != bit_mask)) {
165 reg_val |= bit_mask;
166 ret = adp8870_write(client, reg, reg_val);
167 }
168
169 mutex_unlock(&data->lock);
170 return ret;
171 }
172
173 static int adp8870_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
174 {
175 struct adp8870_bl *data = i2c_get_clientdata(client);
176 uint8_t reg_val;
177 int ret;
178
179 mutex_lock(&data->lock);
180
181 ret = adp8870_read(client, reg, &reg_val);
182
183 if (!ret && (reg_val & bit_mask)) {
184 reg_val &= ~bit_mask;
185 ret = adp8870_write(client, reg, reg_val);
186 }
187
188 mutex_unlock(&data->lock);
189 return ret;
190 }
191
192 /*
193 * Independent sink / LED
194 */
195 #if defined(ADP8870_USE_LEDS)
196 static void adp8870_led_work(struct work_struct *work)
197 {
198 struct adp8870_led *led = container_of(work, struct adp8870_led, work);
199
200 adp8870_write(led->client, ADP8870_ISC1 + led->id - 1,
201 led->new_brightness >> 1);
202 }
203
204 static void adp8870_led_set(struct led_classdev *led_cdev,
205 enum led_brightness value)
206 {
207 struct adp8870_led *led;
208
209 led = container_of(led_cdev, struct adp8870_led, cdev);
210 led->new_brightness = value;
211 /*
212 * Use workqueue for IO since I2C operations can sleep.
213 */
214 schedule_work(&led->work);
215 }
216
217 static int adp8870_led_setup(struct adp8870_led *led)
218 {
219 struct i2c_client *client = led->client;
220 int ret = 0;
221
222 ret = adp8870_write(client, ADP8870_ISC1 + led->id - 1, 0);
223 if (ret)
224 return ret;
225
226 ret = adp8870_set_bits(client, ADP8870_ISCC, 1 << (led->id - 1));
227 if (ret)
228 return ret;
229
230 if (led->id > 4)
231 ret = adp8870_set_bits(client, ADP8870_ISCT1,
232 (led->flags & 0x3) << ((led->id - 5) * 2));
233 else
234 ret = adp8870_set_bits(client, ADP8870_ISCT2,
235 (led->flags & 0x3) << ((led->id - 1) * 2));
236
237 return ret;
238 }
239
240 static int adp8870_led_probe(struct i2c_client *client)
241 {
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;
247 int ret, i;
248
249 led = devm_kzalloc(&client->dev, pdata->num_leds * sizeof(*led),
250 GFP_KERNEL);
251 if (led == NULL)
252 return -ENOMEM;
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 dev_get_platdata(&client->dev);
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
405 if (bl->props.power != FB_BLANK_UNBLANK)
406 brightness = 0;
407
408 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
409 brightness = 0;
410
411 return adp8870_bl_set(bl, brightness);
412 }
413
414 static int adp8870_bl_get_brightness(struct backlight_device *bl)
415 {
416 struct adp8870_bl *data = bl_get_data(bl);
417
418 return data->current_brightness;
419 }
420
421 static const struct backlight_ops adp8870_bl_ops = {
422 .update_status = adp8870_bl_update_status,
423 .get_brightness = adp8870_bl_get_brightness,
424 };
425
426 static int adp8870_bl_setup(struct backlight_device *bl)
427 {
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;
431 int ret = 0;
432
433 ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign);
434 if (ret)
435 return ret;
436
437 ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign);
438 if (ret)
439 return ret;
440
441 ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max);
442 if (ret)
443 return ret;
444
445 ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim);
446 if (ret)
447 return ret;
448
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);
453 if (ret)
454 return ret;
455 ret = adp8870_write(client, ADP8870_BLDM2,
456 pdata->l2_bright_dim);
457 if (ret)
458 return ret;
459
460 ret = adp8870_write(client, ADP8870_BLMX3,
461 pdata->l3_office_max);
462 if (ret)
463 return ret;
464 ret = adp8870_write(client, ADP8870_BLDM3,
465 pdata->l3_office_dim);
466 if (ret)
467 return ret;
468
469 ret = adp8870_write(client, ADP8870_BLMX4,
470 pdata->l4_indoor_max);
471 if (ret)
472 return ret;
473
474 ret = adp8870_write(client, ADP8870_BLDM4,
475 pdata->l4_indor_dim);
476 if (ret)
477 return ret;
478
479 ret = adp8870_write(client, ADP8870_BLMX5,
480 pdata->l5_dark_max);
481 if (ret)
482 return ret;
483
484 ret = adp8870_write(client, ADP8870_BLDM5,
485 pdata->l5_dark_dim);
486 if (ret)
487 return ret;
488
489 ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip);
490 if (ret)
491 return ret;
492
493 ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst);
494 if (ret)
495 return ret;
496
497 ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip);
498 if (ret)
499 return ret;
500
501 ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst);
502 if (ret)
503 return ret;
504
505 ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip);
506 if (ret)
507 return ret;
508
509 ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst);
510 if (ret)
511 return ret;
512
513 ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip);
514 if (ret)
515 return ret;
516
517 ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst);
518 if (ret)
519 return ret;
520
521 ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN |
522 L3_EN | L2_EN);
523 if (ret)
524 return ret;
525
526 ret = adp8870_write(client, ADP8870_CMP_CTL,
527 ALS_CMPR_CFG_VAL(pdata->abml_filt));
528 if (ret)
529 return ret;
530 }
531
532 ret = adp8870_write(client, ADP8870_CFGR,
533 BL_CFGR_VAL(pdata->bl_fade_law, 0));
534 if (ret)
535 return ret;
536
537 ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in,
538 pdata->bl_fade_out));
539 if (ret)
540 return ret;
541 /*
542 * ADP8870 Rev0 requires GDWN_DIS bit set
543 */
544
545 ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY |
546 (data->revid == 0 ? GDWN_DIS : 0));
547
548 return ret;
549 }
550
551 static ssize_t adp8870_show(struct device *dev, char *buf, int reg)
552 {
553 struct adp8870_bl *data = dev_get_drvdata(dev);
554 int error;
555 uint8_t reg_val;
556
557 mutex_lock(&data->lock);
558 error = adp8870_read(data->client, reg, &reg_val);
559 mutex_unlock(&data->lock);
560
561 if (error < 0)
562 return error;
563
564 return sprintf(buf, "%u\n", reg_val);
565 }
566
567 static ssize_t adp8870_store(struct device *dev, const char *buf,
568 size_t count, int reg)
569 {
570 struct adp8870_bl *data = dev_get_drvdata(dev);
571 unsigned long val;
572 int ret;
573
574 ret = kstrtoul(buf, 10, &val);
575 if (ret)
576 return ret;
577
578 mutex_lock(&data->lock);
579 adp8870_write(data->client, reg, val);
580 mutex_unlock(&data->lock);
581
582 return count;
583 }
584
585 static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
587 {
588 return adp8870_show(dev, buf, ADP8870_BLMX5);
589 }
590
591 static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev,
592 struct device_attribute *attr, const char *buf, size_t count)
593 {
594 return adp8870_store(dev, buf, count, ADP8870_BLMX5);
595 }
596 static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show,
597 adp8870_bl_l5_dark_max_store);
598
599
600 static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev,
601 struct device_attribute *attr, char *buf)
602 {
603 return adp8870_show(dev, buf, ADP8870_BLMX4);
604 }
605
606 static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev,
607 struct device_attribute *attr, const char *buf, size_t count)
608 {
609 return adp8870_store(dev, buf, count, ADP8870_BLMX4);
610 }
611 static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show,
612 adp8870_bl_l4_indoor_max_store);
613
614
615 static ssize_t adp8870_bl_l3_office_max_show(struct device *dev,
616 struct device_attribute *attr, char *buf)
617 {
618 return adp8870_show(dev, buf, ADP8870_BLMX3);
619 }
620
621 static ssize_t adp8870_bl_l3_office_max_store(struct device *dev,
622 struct device_attribute *attr, const char *buf, size_t count)
623 {
624 return adp8870_store(dev, buf, count, ADP8870_BLMX3);
625 }
626
627 static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show,
628 adp8870_bl_l3_office_max_store);
629
630 static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev,
631 struct device_attribute *attr, char *buf)
632 {
633 return adp8870_show(dev, buf, ADP8870_BLMX2);
634 }
635
636 static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev,
637 struct device_attribute *attr, const char *buf, size_t count)
638 {
639 return adp8870_store(dev, buf, count, ADP8870_BLMX2);
640 }
641 static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show,
642 adp8870_bl_l2_bright_max_store);
643
644 static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev,
645 struct device_attribute *attr, char *buf)
646 {
647 return adp8870_show(dev, buf, ADP8870_BLMX1);
648 }
649
650 static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev,
651 struct device_attribute *attr, const char *buf, size_t count)
652 {
653 struct adp8870_bl *data = dev_get_drvdata(dev);
654 int ret = kstrtoul(buf, 10, &data->cached_daylight_max);
655
656 if (ret)
657 return ret;
658
659 return adp8870_store(dev, buf, count, ADP8870_BLMX1);
660 }
661 static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show,
662 adp8870_bl_l1_daylight_max_store);
663
664 static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev,
665 struct device_attribute *attr, char *buf)
666 {
667 return adp8870_show(dev, buf, ADP8870_BLDM5);
668 }
669
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)
673 {
674 return adp8870_store(dev, buf, count, ADP8870_BLDM5);
675 }
676 static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show,
677 adp8870_bl_l5_dark_dim_store);
678
679 static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev,
680 struct device_attribute *attr, char *buf)
681 {
682 return adp8870_show(dev, buf, ADP8870_BLDM4);
683 }
684
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)
688 {
689 return adp8870_store(dev, buf, count, ADP8870_BLDM4);
690 }
691 static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show,
692 adp8870_bl_l4_indoor_dim_store);
693
694
695 static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev,
696 struct device_attribute *attr, char *buf)
697 {
698 return adp8870_show(dev, buf, ADP8870_BLDM3);
699 }
700
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)
704 {
705 return adp8870_store(dev, buf, count, ADP8870_BLDM3);
706 }
707 static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show,
708 adp8870_bl_l3_office_dim_store);
709
710 static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev,
711 struct device_attribute *attr, char *buf)
712 {
713 return adp8870_show(dev, buf, ADP8870_BLDM2);
714 }
715
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)
719 {
720 return adp8870_store(dev, buf, count, ADP8870_BLDM2);
721 }
722 static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show,
723 adp8870_bl_l2_bright_dim_store);
724
725 static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev,
726 struct device_attribute *attr, char *buf)
727 {
728 return adp8870_show(dev, buf, ADP8870_BLDM1);
729 }
730
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)
734 {
735 return adp8870_store(dev, buf, count, ADP8870_BLDM1);
736 }
737 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show,
738 adp8870_bl_l1_daylight_dim_store);
739
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)
743 {
744 struct adp8870_bl *data = dev_get_drvdata(dev);
745 int error;
746 uint8_t reg_val;
747 uint16_t ret_val;
748
749 mutex_lock(&data->lock);
750 error = adp8870_read(data->client, ADP8870_PH1LEVL, &reg_val);
751 if (error < 0) {
752 mutex_unlock(&data->lock);
753 return error;
754 }
755 ret_val = reg_val;
756 error = adp8870_read(data->client, ADP8870_PH1LEVH, &reg_val);
757 mutex_unlock(&data->lock);
758
759 if (error < 0)
760 return error;
761
762 /* Return 13-bit conversion value for the first light sensor */
763 ret_val += (reg_val & 0x1F) << 8;
764
765 return sprintf(buf, "%u\n", ret_val);
766 }
767 static DEVICE_ATTR(ambient_light_level, 0444,
768 adp8870_bl_ambient_light_level_show, NULL);
769
770 static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev,
771 struct device_attribute *attr, char *buf)
772 {
773 struct adp8870_bl *data = dev_get_drvdata(dev);
774 int error;
775 uint8_t reg_val;
776
777 mutex_lock(&data->lock);
778 error = adp8870_read(data->client, ADP8870_CFGR, &reg_val);
779 mutex_unlock(&data->lock);
780
781 if (error < 0)
782 return error;
783
784 return sprintf(buf, "%u\n",
785 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
786 }
787
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)
791 {
792 struct adp8870_bl *data = dev_get_drvdata(dev);
793 unsigned long val;
794 uint8_t reg_val;
795 int ret;
796
797 ret = kstrtoul(buf, 10, &val);
798 if (ret)
799 return ret;
800
801 if (val == 0) {
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);
807
808 /* Set user supplied ambient light zone */
809 mutex_lock(&data->lock);
810 adp8870_read(data->client, ADP8870_CFGR, &reg_val);
811 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
812 reg_val |= (val - 1) << CFGR_BLV_SHIFT;
813 adp8870_write(data->client, ADP8870_CFGR, reg_val);
814 mutex_unlock(&data->lock);
815 }
816
817 return count;
818 }
819 static DEVICE_ATTR(ambient_light_zone, 0664,
820 adp8870_bl_ambient_light_zone_show,
821 adp8870_bl_ambient_light_zone_store);
822 #endif
823
824 static struct attribute *adp8870_bl_attributes[] = {
825 &dev_attr_l5_dark_max.attr,
826 &dev_attr_l5_dark_dim.attr,
827 &dev_attr_l4_indoor_max.attr,
828 &dev_attr_l4_indoor_dim.attr,
829 &dev_attr_l3_office_max.attr,
830 &dev_attr_l3_office_dim.attr,
831 &dev_attr_l2_bright_max.attr,
832 &dev_attr_l2_bright_dim.attr,
833 &dev_attr_l1_daylight_max.attr,
834 &dev_attr_l1_daylight_dim.attr,
835 #ifdef ADP8870_EXT_FEATURES
836 &dev_attr_ambient_light_level.attr,
837 &dev_attr_ambient_light_zone.attr,
838 #endif
839 NULL
840 };
841
842 static const struct attribute_group adp8870_bl_attr_group = {
843 .attrs = adp8870_bl_attributes,
844 };
845
846 static int adp8870_probe(struct i2c_client *client,
847 const struct i2c_device_id *id)
848 {
849 struct backlight_properties props;
850 struct backlight_device *bl;
851 struct adp8870_bl *data;
852 struct adp8870_backlight_platform_data *pdata =
853 dev_get_platdata(&client->dev);
854 uint8_t reg_val;
855 int ret;
856
857 if (!i2c_check_functionality(client->adapter,
858 I2C_FUNC_SMBUS_BYTE_DATA)) {
859 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
860 return -EIO;
861 }
862
863 if (!pdata) {
864 dev_err(&client->dev, "no platform data?\n");
865 return -EINVAL;
866 }
867
868 ret = adp8870_read(client, ADP8870_MFDVID, &reg_val);
869 if (ret < 0)
870 return -EIO;
871
872 if (ADP8870_MANID(reg_val) != ADP8870_MANUFID) {
873 dev_err(&client->dev, "failed to probe\n");
874 return -ENODEV;
875 }
876
877 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
878 if (data == NULL)
879 return -ENOMEM;
880
881 data->revid = ADP8870_DEVID(reg_val);
882 data->client = client;
883 data->pdata = pdata;
884 data->id = id->driver_data;
885 data->current_brightness = 0;
886 i2c_set_clientdata(client, data);
887
888 mutex_init(&data->lock);
889
890 memset(&props, 0, sizeof(props));
891 props.type = BACKLIGHT_RAW;
892 props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS;
893 bl = devm_backlight_device_register(&client->dev,
894 dev_driver_string(&client->dev),
895 &client->dev, data, &adp8870_bl_ops, &props);
896 if (IS_ERR(bl)) {
897 dev_err(&client->dev, "failed to register backlight\n");
898 return PTR_ERR(bl);
899 }
900
901 data->bl = bl;
902
903 if (pdata->en_ambl_sens) {
904 ret = sysfs_create_group(&bl->dev.kobj,
905 &adp8870_bl_attr_group);
906 if (ret) {
907 dev_err(&client->dev, "failed to register sysfs\n");
908 return ret;
909 }
910 }
911
912 ret = adp8870_bl_setup(bl);
913 if (ret) {
914 ret = -EIO;
915 goto out;
916 }
917
918 backlight_update_status(bl);
919
920 dev_info(&client->dev, "Rev.%d Backlight\n", data->revid);
921
922 if (pdata->num_leds)
923 adp8870_led_probe(client);
924
925 return 0;
926
927 out:
928 if (data->pdata->en_ambl_sens)
929 sysfs_remove_group(&data->bl->dev.kobj,
930 &adp8870_bl_attr_group);
931
932 return ret;
933 }
934
935 static int adp8870_remove(struct i2c_client *client)
936 {
937 struct adp8870_bl *data = i2c_get_clientdata(client);
938
939 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
940
941 if (data->led)
942 adp8870_led_remove(client);
943
944 if (data->pdata->en_ambl_sens)
945 sysfs_remove_group(&data->bl->dev.kobj,
946 &adp8870_bl_attr_group);
947
948 return 0;
949 }
950
951 #ifdef CONFIG_PM_SLEEP
952 static int adp8870_i2c_suspend(struct device *dev)
953 {
954 struct i2c_client *client = to_i2c_client(dev);
955
956 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
957
958 return 0;
959 }
960
961 static int adp8870_i2c_resume(struct device *dev)
962 {
963 struct i2c_client *client = to_i2c_client(dev);
964
965 adp8870_set_bits(client, ADP8870_MDCR, NSTBY | BLEN);
966
967 return 0;
968 }
969 #endif
970
971 static SIMPLE_DEV_PM_OPS(adp8870_i2c_pm_ops, adp8870_i2c_suspend,
972 adp8870_i2c_resume);
973
974 static const struct i2c_device_id adp8870_id[] = {
975 { "adp8870", 0 },
976 { }
977 };
978 MODULE_DEVICE_TABLE(i2c, adp8870_id);
979
980 static struct i2c_driver adp8870_driver = {
981 .driver = {
982 .name = KBUILD_MODNAME,
983 .pm = &adp8870_i2c_pm_ops,
984 },
985 .probe = adp8870_probe,
986 .remove = adp8870_remove,
987 .id_table = adp8870_id,
988 };
989
990 module_i2c_driver(adp8870_driver);
991
992 MODULE_LICENSE("GPL v2");
993 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
994 MODULE_DESCRIPTION("ADP8870 Backlight driver");
995 MODULE_ALIAS("i2c:adp8870-backlight");
Linux with added FPC-III support