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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / video / backlight / adp8870_bl.c
blob4c0032010cfe20e7ace0d6fcaf307ff082a5cc10
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Backlight driver for Analog Devices ADP8870 Backlight Devices
4 *
5 * Copyright 2009-2011 Analog Devices Inc.
6 */
7
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/errno.h>
11 #include <linux/pm.h>
12 #include <linux/platform_device.h>
13 #include <linux/i2c.h>
14 #include <linux/fb.h>
15 #include <linux/backlight.h>
16 #include <linux/leds.h>
17 #include <linux/workqueue.h>
18 #include <linux/slab.h>
19
20 #include <linux/platform_data/adp8870.h>
21 #define ADP8870_EXT_FEATURES
22 #define ADP8870_USE_LEDS
23
24
25 #define ADP8870_MFDVID 0x00 /* Manufacturer and device ID */
26 #define ADP8870_MDCR 0x01 /* Device mode and status */
27 #define ADP8870_INT_STAT 0x02 /* Interrupts status */
28 #define ADP8870_INT_EN 0x03 /* Interrupts enable */
29 #define ADP8870_CFGR 0x04 /* Configuration register */
30 #define ADP8870_BLSEL 0x05 /* Sink enable backlight or independent */
31 #define ADP8870_PWMLED 0x06 /* PWM Enable Selection Register */
32 #define ADP8870_BLOFF 0x07 /* Backlight off timeout */
33 #define ADP8870_BLDIM 0x08 /* Backlight dim timeout */
34 #define ADP8870_BLFR 0x09 /* Backlight fade in and out rates */
35 #define ADP8870_BLMX1 0x0A /* Backlight (Brightness Level 1-daylight) maximum current */
36 #define ADP8870_BLDM1 0x0B /* Backlight (Brightness Level 1-daylight) dim current */
37 #define ADP8870_BLMX2 0x0C /* Backlight (Brightness Level 2-bright) maximum current */
38 #define ADP8870_BLDM2 0x0D /* Backlight (Brightness Level 2-bright) dim current */
39 #define ADP8870_BLMX3 0x0E /* Backlight (Brightness Level 3-office) maximum current */
40 #define ADP8870_BLDM3 0x0F /* Backlight (Brightness Level 3-office) dim current */
41 #define ADP8870_BLMX4 0x10 /* Backlight (Brightness Level 4-indoor) maximum current */
42 #define ADP8870_BLDM4 0x11 /* Backlight (Brightness Level 4-indoor) dim current */
43 #define ADP8870_BLMX5 0x12 /* Backlight (Brightness Level 5-dark) maximum current */
44 #define ADP8870_BLDM5 0x13 /* Backlight (Brightness Level 5-dark) dim current */
45 #define ADP8870_ISCLAW 0x1A /* Independent sink current fade law register */
46 #define ADP8870_ISCC 0x1B /* Independent sink current control register */
47 #define ADP8870_ISCT1 0x1C /* Independent Sink Current Timer Register LED[7:5] */
48 #define ADP8870_ISCT2 0x1D /* Independent Sink Current Timer Register LED[4:1] */
49 #define ADP8870_ISCF 0x1E /* Independent sink current fade register */
50 #define ADP8870_ISC1 0x1F /* Independent Sink Current LED1 */
51 #define ADP8870_ISC2 0x20 /* Independent Sink Current LED2 */
52 #define ADP8870_ISC3 0x21 /* Independent Sink Current LED3 */
53 #define ADP8870_ISC4 0x22 /* Independent Sink Current LED4 */
54 #define ADP8870_ISC5 0x23 /* Independent Sink Current LED5 */
55 #define ADP8870_ISC6 0x24 /* Independent Sink Current LED6 */
56 #define ADP8870_ISC7 0x25 /* Independent Sink Current LED7 (Brightness Level 1-daylight) */
57 #define ADP8870_ISC7_L2 0x26 /* Independent Sink Current LED7 (Brightness Level 2-bright) */
58 #define ADP8870_ISC7_L3 0x27 /* Independent Sink Current LED7 (Brightness Level 3-office) */
59 #define ADP8870_ISC7_L4 0x28 /* Independent Sink Current LED7 (Brightness Level 4-indoor) */
60 #define ADP8870_ISC7_L5 0x29 /* Independent Sink Current LED7 (Brightness Level 5-dark) */
61 #define ADP8870_CMP_CTL 0x2D /* ALS Comparator Control Register */
62 #define ADP8870_ALS1_EN 0x2E /* Main ALS comparator level enable */
63 #define ADP8870_ALS2_EN 0x2F /* Second ALS comparator level enable */
64 #define ADP8870_ALS1_STAT 0x30 /* Main ALS Comparator Status Register */
65 #define ADP8870_ALS2_STAT 0x31 /* Second ALS Comparator Status Register */
66 #define ADP8870_L2TRP 0x32 /* L2 comparator reference */
67 #define ADP8870_L2HYS 0x33 /* L2 hysteresis */
68 #define ADP8870_L3TRP 0x34 /* L3 comparator reference */
69 #define ADP8870_L3HYS 0x35 /* L3 hysteresis */
70 #define ADP8870_L4TRP 0x36 /* L4 comparator reference */
71 #define ADP8870_L4HYS 0x37 /* L4 hysteresis */
72 #define ADP8870_L5TRP 0x38 /* L5 comparator reference */
73 #define ADP8870_L5HYS 0x39 /* L5 hysteresis */
74 #define ADP8870_PH1LEVL 0x40 /* First phototransistor ambient light level-low byte register */
75 #define ADP8870_PH1LEVH 0x41 /* First phototransistor ambient light level-high byte register */
76 #define ADP8870_PH2LEVL 0x42 /* Second phototransistor ambient light level-low byte register */
77 #define ADP8870_PH2LEVH 0x43 /* Second phototransistor ambient light level-high byte register */
78
79 #define ADP8870_MANUFID 0x3 /* Analog Devices AD8870 Manufacturer and device ID */
80 #define ADP8870_DEVID(x) ((x) & 0xF)
81 #define ADP8870_MANID(x) ((x) >> 4)
82
83 /* MDCR Device mode and status */
84 #define D7ALSEN (1 << 7)
85 #define INT_CFG (1 << 6)
86 #define NSTBY (1 << 5)
87 #define DIM_EN (1 << 4)
88 #define GDWN_DIS (1 << 3)
89 #define SIS_EN (1 << 2)
90 #define CMP_AUTOEN (1 << 1)
91 #define BLEN (1 << 0)
92
93 /* ADP8870_ALS1_EN Main ALS comparator level enable */
94 #define L5_EN (1 << 3)
95 #define L4_EN (1 << 2)
96 #define L3_EN (1 << 1)
97 #define L2_EN (1 << 0)
98
99 #define CFGR_BLV_SHIFT 3
100 #define CFGR_BLV_MASK 0x7
101 #define ADP8870_FLAG_LED_MASK 0xFF
102
103 #define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4))
104 #define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))
105 #define ALS_CMPR_CFG_VAL(filt) ((0x7 & (filt)) << 1)
106
107 struct adp8870_bl {
108 struct i2c_client *client;
109 struct backlight_device *bl;
110 struct adp8870_led *led;
111 struct adp8870_backlight_platform_data *pdata;
112 struct mutex lock;
113 unsigned long cached_daylight_max;
114 int id;
115 int revid;
116 int current_brightness;
117 };
118
119 struct adp8870_led {
120 struct led_classdev cdev;
121 struct work_struct work;
122 struct i2c_client *client;
123 enum led_brightness new_brightness;
124 int id;
125 int flags;
126 };
127
128 static int adp8870_read(struct i2c_client *client, int reg, uint8_t *val)
129 {
130 int ret;
131
132 ret = i2c_smbus_read_byte_data(client, reg);
133 if (ret < 0) {
134 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
135 return ret;
136 }
137
138 *val = ret;
139 return 0;
140 }
141
142
143 static int adp8870_write(struct i2c_client *client, u8 reg, u8 val)
144 {
145 int ret = i2c_smbus_write_byte_data(client, reg, val);
146
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
199 adp8870_write(led->client, ADP8870_ISC1 + led->id - 1,
200 led->new_brightness >> 1);
201 }
202
203 static void adp8870_led_set(struct led_classdev *led_cdev,
204 enum led_brightness value)
205 {
206 struct adp8870_led *led;
207
208 led = container_of(led_cdev, struct adp8870_led, cdev);
209 led->new_brightness = value;
210 /*
211 * Use workqueue for IO since I2C operations can sleep.
212 */
213 schedule_work(&led->work);
214 }
215
216 static int adp8870_led_setup(struct adp8870_led *led)
217 {
218 struct i2c_client *client = led->client;
219 int ret = 0;
220
221 ret = adp8870_write(client, ADP8870_ISC1 + led->id - 1, 0);
222 if (ret)
223 return ret;
224
225 ret = adp8870_set_bits(client, ADP8870_ISCC, 1 << (led->id - 1));
226 if (ret)
227 return ret;
228
229 if (led->id > 4)
230 ret = adp8870_set_bits(client, ADP8870_ISCT1,
231 (led->flags & 0x3) << ((led->id - 5) * 2));
232 else
233 ret = adp8870_set_bits(client, ADP8870_ISCT2,
234 (led->flags & 0x3) << ((led->id - 1) * 2));
235
236 return ret;
237 }
238
239 static int adp8870_led_probe(struct i2c_client *client)
240 {
241 struct adp8870_backlight_platform_data *pdata =
242 dev_get_platdata(&client->dev);
243 struct adp8870_bl *data = i2c_get_clientdata(client);
244 struct adp8870_led *led, *led_dat;
245 struct led_info *cur_led;
246 int ret, i;
247
248 led = devm_kcalloc(&client->dev, pdata->num_leds, sizeof(*led),
249 GFP_KERNEL);
250 if (led == NULL)
251 return -ENOMEM;
252
253 ret = adp8870_write(client, ADP8870_ISCLAW, pdata->led_fade_law);
254 if (ret)
255 return ret;
256
257 ret = adp8870_write(client, ADP8870_ISCT1,
258 (pdata->led_on_time & 0x3) << 6);
259 if (ret)
260 return ret;
261
262 ret = adp8870_write(client, ADP8870_ISCF,
263 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
264 if (ret)
265 return ret;
266
267 for (i = 0; i < pdata->num_leds; ++i) {
268 cur_led = &pdata->leds[i];
269 led_dat = &led[i];
270
271 led_dat->id = cur_led->flags & ADP8870_FLAG_LED_MASK;
272
273 if (led_dat->id > 7 || led_dat->id < 1) {
274 dev_err(&client->dev, "Invalid LED ID %d\n",
275 led_dat->id);
276 ret = -EINVAL;
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 ret = -EBUSY;
284 goto err;
285 }
286
287 led_dat->cdev.name = cur_led->name;
288 led_dat->cdev.default_trigger = cur_led->default_trigger;
289 led_dat->cdev.brightness_set = adp8870_led_set;
290 led_dat->cdev.brightness = LED_OFF;
291 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;
292 led_dat->client = client;
293 led_dat->new_brightness = LED_OFF;
294 INIT_WORK(&led_dat->work, adp8870_led_work);
295
296 ret = led_classdev_register(&client->dev, &led_dat->cdev);
297 if (ret) {
298 dev_err(&client->dev, "failed to register LED %d\n",
299 led_dat->id);
300 goto err;
301 }
302
303 ret = adp8870_led_setup(led_dat);
304 if (ret) {
305 dev_err(&client->dev, "failed to write\n");
306 i++;
307 goto err;
308 }
309 }
310
311 data->led = led;
312
313 return 0;
314
315 err:
316 for (i = i - 1; i >= 0; --i) {
317 led_classdev_unregister(&led[i].cdev);
318 cancel_work_sync(&led[i].work);
319 }
320
321 return ret;
322 }
323
324 static int adp8870_led_remove(struct i2c_client *client)
325 {
326 struct adp8870_backlight_platform_data *pdata =
327 dev_get_platdata(&client->dev);
328 struct adp8870_bl *data = i2c_get_clientdata(client);
329 int i;
330
331 for (i = 0; i < pdata->num_leds; i++) {
332 led_classdev_unregister(&data->led[i].cdev);
333 cancel_work_sync(&data->led[i].work);
334 }
335
336 return 0;
337 }
338 #else
339 static int adp8870_led_probe(struct i2c_client *client)
340 {
341 return 0;
342 }
343
344 static int adp8870_led_remove(struct i2c_client *client)
345 {
346 return 0;
347 }
348 #endif
349
350 static int adp8870_bl_set(struct backlight_device *bl, int brightness)
351 {
352 struct adp8870_bl *data = bl_get_data(bl);
353 struct i2c_client *client = data->client;
354 int ret = 0;
355
356 if (data->pdata->en_ambl_sens) {
357 if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) {
358 /* Disable Ambient Light auto adjust */
359 ret = adp8870_clr_bits(client, ADP8870_MDCR,
360 CMP_AUTOEN);
361 if (ret)
362 return ret;
363 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
364 if (ret)
365 return ret;
366 } else {
367 /*
368 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
369 * restore daylight l1 sysfs brightness
370 */
371 ret = adp8870_write(client, ADP8870_BLMX1,
372 data->cached_daylight_max);
373 if (ret)
374 return ret;
375
376 ret = adp8870_set_bits(client, ADP8870_MDCR,
377 CMP_AUTOEN);
378 if (ret)
379 return ret;
380 }
381 } else {
382 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
383 if (ret)
384 return ret;
385 }
386
387 if (data->current_brightness && brightness == 0)
388 ret = adp8870_set_bits(client,
389 ADP8870_MDCR, DIM_EN);
390 else if (data->current_brightness == 0 && brightness)
391 ret = adp8870_clr_bits(client,
392 ADP8870_MDCR, DIM_EN);
393
394 if (!ret)
395 data->current_brightness = brightness;
396
397 return ret;
398 }
399
400 static int adp8870_bl_update_status(struct backlight_device *bl)
401 {
402 int brightness = bl->props.brightness;
403
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
655 if (ret)
656 return ret;
657
658 return adp8870_store(dev, buf, count, ADP8870_BLMX1);
659 }
660 static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show,
661 adp8870_bl_l1_daylight_max_store);
662
663 static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev,
664 struct device_attribute *attr, char *buf)
665 {
666 return adp8870_show(dev, buf, ADP8870_BLDM5);
667 }
668
669 static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev,
670 struct device_attribute *attr,
671 const char *buf, size_t count)
672 {
673 return adp8870_store(dev, buf, count, ADP8870_BLDM5);
674 }
675 static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show,
676 adp8870_bl_l5_dark_dim_store);
677
678 static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev,
679 struct device_attribute *attr, char *buf)
680 {
681 return adp8870_show(dev, buf, ADP8870_BLDM4);
682 }
683
684 static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev,
685 struct device_attribute *attr,
686 const char *buf, size_t count)
687 {
688 return adp8870_store(dev, buf, count, ADP8870_BLDM4);
689 }
690 static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show,
691 adp8870_bl_l4_indoor_dim_store);
692
693
694 static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev,
695 struct device_attribute *attr, char *buf)
696 {
697 return adp8870_show(dev, buf, ADP8870_BLDM3);
698 }
699
700 static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev,
701 struct device_attribute *attr,
702 const char *buf, size_t count)
703 {
704 return adp8870_store(dev, buf, count, ADP8870_BLDM3);
705 }
706 static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show,
707 adp8870_bl_l3_office_dim_store);
708
709 static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev,
710 struct device_attribute *attr, char *buf)
711 {
712 return adp8870_show(dev, buf, ADP8870_BLDM2);
713 }
714
715 static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev,
716 struct device_attribute *attr,
717 const char *buf, size_t count)
718 {
719 return adp8870_store(dev, buf, count, ADP8870_BLDM2);
720 }
721 static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show,
722 adp8870_bl_l2_bright_dim_store);
723
724 static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev,
725 struct device_attribute *attr, char *buf)
726 {
727 return adp8870_show(dev, buf, ADP8870_BLDM1);
728 }
729
730 static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev,
731 struct device_attribute *attr,
732 const char *buf, size_t count)
733 {
734 return adp8870_store(dev, buf, count, ADP8870_BLDM1);
735 }
736 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show,
737 adp8870_bl_l1_daylight_dim_store);
738
739 #ifdef ADP8870_EXT_FEATURES
740 static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev,
741 struct device_attribute *attr, char *buf)
742 {
743 struct adp8870_bl *data = dev_get_drvdata(dev);
744 int error;
745 uint8_t reg_val;
746 uint16_t ret_val;
747
748 mutex_lock(&data->lock);
749 error = adp8870_read(data->client, ADP8870_PH1LEVL, &reg_val);
750 if (error < 0) {
751 mutex_unlock(&data->lock);
752 return error;
753 }
754 ret_val = reg_val;
755 error = adp8870_read(data->client, ADP8870_PH1LEVH, &reg_val);
756 mutex_unlock(&data->lock);
757
758 if (error < 0)
759 return error;
760
761 /* Return 13-bit conversion value for the first light sensor */
762 ret_val += (reg_val & 0x1F) << 8;
763
764 return sprintf(buf, "%u\n", ret_val);
765 }
766 static DEVICE_ATTR(ambient_light_level, 0444,
767 adp8870_bl_ambient_light_level_show, NULL);
768
769 static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev,
770 struct device_attribute *attr, char *buf)
771 {
772 struct adp8870_bl *data = dev_get_drvdata(dev);
773 int error;
774 uint8_t reg_val;
775
776 mutex_lock(&data->lock);
777 error = adp8870_read(data->client, ADP8870_CFGR, &reg_val);
778 mutex_unlock(&data->lock);
779
780 if (error < 0)
781 return error;
782
783 return sprintf(buf, "%u\n",
784 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
785 }
786
787 static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
788 struct device_attribute *attr,
789 const char *buf, size_t count)
790 {
791 struct adp8870_bl *data = dev_get_drvdata(dev);
792 unsigned long val;
793 uint8_t reg_val;
794 int ret;
795
796 ret = kstrtoul(buf, 10, &val);
797 if (ret)
798 return ret;
799
800 if (val == 0) {
801 /* Enable automatic ambient light sensing */
802 adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
803 } else if ((val > 0) && (val < 6)) {
804 /* Disable automatic ambient light sensing */
805 adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
806
807 /* Set user supplied ambient light zone */
808 mutex_lock(&data->lock);
809 ret = adp8870_read(data->client, ADP8870_CFGR, &reg_val);
810 if (!ret) {
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 }
815 mutex_unlock(&data->lock);
816 }
817
818 return count;
819 }
820 static DEVICE_ATTR(ambient_light_zone, 0664,
821 adp8870_bl_ambient_light_zone_show,
822 adp8870_bl_ambient_light_zone_store);
823 #endif
824
825 static struct attribute *adp8870_bl_attributes[] = {
826 &dev_attr_l5_dark_max.attr,
827 &dev_attr_l5_dark_dim.attr,
828 &dev_attr_l4_indoor_max.attr,
829 &dev_attr_l4_indoor_dim.attr,
830 &dev_attr_l3_office_max.attr,
831 &dev_attr_l3_office_dim.attr,
832 &dev_attr_l2_bright_max.attr,
833 &dev_attr_l2_bright_dim.attr,
834 &dev_attr_l1_daylight_max.attr,
835 &dev_attr_l1_daylight_dim.attr,
836 #ifdef ADP8870_EXT_FEATURES
837 &dev_attr_ambient_light_level.attr,
838 &dev_attr_ambient_light_zone.attr,
839 #endif
840 NULL
841 };
842
843 static const struct attribute_group adp8870_bl_attr_group = {
844 .attrs = adp8870_bl_attributes,
845 };
846
847 static int adp8870_probe(struct i2c_client *client,
848 const struct i2c_device_id *id)
849 {
850 struct backlight_properties props;
851 struct backlight_device *bl;
852 struct adp8870_bl *data;
853 struct adp8870_backlight_platform_data *pdata =
854 dev_get_platdata(&client->dev);
855 uint8_t reg_val;
856 int ret;
857
858 if (!i2c_check_functionality(client->adapter,
859 I2C_FUNC_SMBUS_BYTE_DATA)) {
860 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
861 return -EIO;
862 }
863
864 if (!pdata) {
865 dev_err(&client->dev, "no platform data?\n");
866 return -EINVAL;
867 }
868
869 ret = adp8870_read(client, ADP8870_MFDVID, &reg_val);
870 if (ret < 0)
871 return -EIO;
872
873 if (ADP8870_MANID(reg_val) != ADP8870_MANUFID) {
874 dev_err(&client->dev, "failed to probe\n");
875 return -ENODEV;
876 }
877
878 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
879 if (data == NULL)
880 return -ENOMEM;
881
882 data->revid = ADP8870_DEVID(reg_val);
883 data->client = client;
884 data->pdata = pdata;
885 data->id = id->driver_data;
886 data->current_brightness = 0;
887 i2c_set_clientdata(client, data);
888
889 mutex_init(&data->lock);
890
891 memset(&props, 0, sizeof(props));
892 props.type = BACKLIGHT_RAW;
893 props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS;
894 bl = devm_backlight_device_register(&client->dev,
895 dev_driver_string(&client->dev),
896 &client->dev, data, &adp8870_bl_ops, &props);
897 if (IS_ERR(bl)) {
898 dev_err(&client->dev, "failed to register backlight\n");
899 return PTR_ERR(bl);
900 }
901
902 data->bl = bl;
903
904 if (pdata->en_ambl_sens) {
905 ret = sysfs_create_group(&bl->dev.kobj,
906 &adp8870_bl_attr_group);
907 if (ret) {
908 dev_err(&client->dev, "failed to register sysfs\n");
909 return ret;
910 }
911 }
912
913 ret = adp8870_bl_setup(bl);
914 if (ret) {
915 ret = -EIO;
916 goto out;
917 }
918
919 backlight_update_status(bl);
920
921 dev_info(&client->dev, "Rev.%d Backlight\n", data->revid);
922
923 if (pdata->num_leds)
924 adp8870_led_probe(client);
925
926 return 0;
927
928 out:
929 if (data->pdata->en_ambl_sens)
930 sysfs_remove_group(&data->bl->dev.kobj,
931 &adp8870_bl_attr_group);
932
933 return ret;
934 }
935
936 static int adp8870_remove(struct i2c_client *client)
937 {
938 struct adp8870_bl *data = i2c_get_clientdata(client);
939
940 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
941
942 if (data->led)
943 adp8870_led_remove(client);
944
945 if (data->pdata->en_ambl_sens)
946 sysfs_remove_group(&data->bl->dev.kobj,
947 &adp8870_bl_attr_group);
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 <michael.hennerich@analog.com>");
995 MODULE_DESCRIPTION("ADP8870 Backlight driver");
Linux with added FPC-III support