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backlight: new driver for the ADP8870 backlight devices
[mirror_ubuntu-focal-kernel.git] / drivers / video / backlight / adp8870_bl.c
CommitLineData
a59ec1e7
MH		 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/version.h>
11#include <linux/init.h>
12#include <linux/errno.h>
13#include <linux/pm.h>
14#include <linux/platform_device.h>
15#include <linux/i2c.h>
16#include <linux/fb.h>
17#include <linux/backlight.h>
18#include <linux/leds.h>
19#include <linux/workqueue.h>
20#include <linux/slab.h>
21
22#include <linux/i2c/adp8870.h>
23#define ADP8870_EXT_FEATURES
24#define ADP8870_USE_LEDS
25
26
27#define ADP8870_MFDVID 0x00 /* Manufacturer and device ID */
28#define ADP8870_MDCR 0x01 /* Device mode and status */
29#define ADP8870_INT_STAT 0x02 /* Interrupts status */
30#define ADP8870_INT_EN 0x03 /* Interrupts enable */
31#define ADP8870_CFGR 0x04 /* Configuration register */
32#define ADP8870_BLSEL 0x05 /* Sink enable backlight or independent */
33#define ADP8870_PWMLED 0x06 /* PWM Enable Selection Register */
34#define ADP8870_BLOFF 0x07 /* Backlight off timeout */
35#define ADP8870_BLDIM 0x08 /* Backlight dim timeout */
36#define ADP8870_BLFR 0x09 /* Backlight fade in and out rates */
37#define ADP8870_BLMX1 0x0A /* Backlight (Brightness Level 1-daylight) maximum current */
38#define ADP8870_BLDM1 0x0B /* Backlight (Brightness Level 1-daylight) dim current */
39#define ADP8870_BLMX2 0x0C /* Backlight (Brightness Level 2-bright) maximum current */
40#define ADP8870_BLDM2 0x0D /* Backlight (Brightness Level 2-bright) dim current */
41#define ADP8870_BLMX3 0x0E /* Backlight (Brightness Level 3-office) maximum current */
42#define ADP8870_BLDM3 0x0F /* Backlight (Brightness Level 3-office) dim current */
43#define ADP8870_BLMX4 0x10 /* Backlight (Brightness Level 4-indoor) maximum current */
44#define ADP8870_BLDM4 0x11 /* Backlight (Brightness Level 4-indoor) dim current */
45#define ADP8870_BLMX5 0x12 /* Backlight (Brightness Level 5-dark) maximum current */
46#define ADP8870_BLDM5 0x13 /* Backlight (Brightness Level 5-dark) dim current */
47#define ADP8870_ISCLAW 0x1A /* Independent sink current fade law register */
48#define ADP8870_ISCC 0x1B /* Independent sink current control register */
49#define ADP8870_ISCT1 0x1C /* Independent Sink Current Timer Register LED[7:5] */
50#define ADP8870_ISCT2 0x1D /* Independent Sink Current Timer Register LED[4:1] */
51#define ADP8870_ISCF 0x1E /* Independent sink current fade register */
52#define ADP8870_ISC1 0x1F /* Independent Sink Current LED1 */
53#define ADP8870_ISC2 0x20 /* Independent Sink Current LED2 */
54#define ADP8870_ISC3 0x21 /* Independent Sink Current LED3 */
55#define ADP8870_ISC4 0x22 /* Independent Sink Current LED4 */
56#define ADP8870_ISC5 0x23 /* Independent Sink Current LED5 */
57#define ADP8870_ISC6 0x24 /* Independent Sink Current LED6 */
58#define ADP8870_ISC7 0x25 /* Independent Sink Current LED7 (Brightness Level 1-daylight) */
59#define ADP8870_ISC7_L2 0x26 /* Independent Sink Current LED7 (Brightness Level 2-bright) */
60#define ADP8870_ISC7_L3 0x27 /* Independent Sink Current LED7 (Brightness Level 3-office) */
61#define ADP8870_ISC7_L4 0x28 /* Independent Sink Current LED7 (Brightness Level 4-indoor) */
62#define ADP8870_ISC7_L5 0x29 /* Independent Sink Current LED7 (Brightness Level 5-dark) */
63#define ADP8870_CMP_CTL 0x2D /* ALS Comparator Control Register */
64#define ADP8870_ALS1_EN 0x2E /* Main ALS comparator level enable */
65#define ADP8870_ALS2_EN 0x2F /* Second ALS comparator level enable */
66#define ADP8870_ALS1_STAT 0x30 /* Main ALS Comparator Status Register */
67#define ADP8870_ALS2_STAT 0x31 /* Second ALS Comparator Status Register */
68#define ADP8870_L2TRP 0x32 /* L2 comparator reference */
69#define ADP8870_L2HYS 0x33 /* L2 hysteresis */
70#define ADP8870_L3TRP 0x34 /* L3 comparator reference */
71#define ADP8870_L3HYS 0x35 /* L3 hysteresis */
72#define ADP8870_L4TRP 0x36 /* L4 comparator reference */
73#define ADP8870_L4HYS 0x37 /* L4 hysteresis */
74#define ADP8870_L5TRP 0x38 /* L5 comparator reference */
75#define ADP8870_L5HYS 0x39 /* L5 hysteresis */
76#define ADP8870_PH1LEVL 0x40 /* First phototransistor ambient light level-low byte register */
77#define ADP8870_PH1LEVH 0x41 /* First phototransistor ambient light level-high byte register */
78#define ADP8870_PH2LEVL 0x42 /* Second phototransistor ambient light level-low byte register */
79#define ADP8870_PH2LEVH 0x43 /* Second phototransistor ambient light level-high byte register */
80
81#define ADP8870_MANUFID 0x3 /* Analog Devices AD8870 Manufacturer and device ID */
82#define ADP8870_DEVID(x) ((x) & 0xF)
83#define ADP8870_MANID(x) ((x) >> 4)
84
85/* MDCR Device mode and status */
86#define D7ALSEN (1 << 7)
87#define INT_CFG (1 << 6)
88#define NSTBY (1 << 5)
89#define DIM_EN (1 << 4)
90#define GDWN_DIS (1 << 3)
91#define SIS_EN (1 << 2)
92#define CMP_AUTOEN (1 << 1)
93#define BLEN (1 << 0)
94
95/* ADP8870_ALS1_EN Main ALS comparator level enable */
96#define L5_EN (1 << 3)
97#define L4_EN (1 << 2)
98#define L3_EN (1 << 1)
99#define L2_EN (1 << 0)
100
101#define CFGR_BLV_SHIFT 3
102#define CFGR_BLV_MASK 0x7
103#define ADP8870_FLAG_LED_MASK 0xFF
104
105#define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4))
106#define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))
107#define ALS_CMPR_CFG_VAL(filt) ((0x7 & (filt)) << 1)
108
109struct adp8870_bl {
110 struct i2c_client *client;
111 struct backlight_device *bl;
112 struct adp8870_led *led;
113 struct adp8870_backlight_platform_data *pdata;
114 struct mutex lock;
115 unsigned long cached_daylight_max;
116 int id;
117 int revid;
118 int current_brightness;
119};
120
121struct adp8870_led {
122 struct led_classdev cdev;
123 struct work_struct work;
124 struct i2c_client *client;
125 enum led_brightness new_brightness;
126 int id;
127 int flags;
128};
129
130static int adp8870_read(struct i2c_client *client, int reg, uint8_t *val)
131{
132 int ret;
133
134 ret = i2c_smbus_read_byte_data(client, reg);
135 if (ret < 0) {
136 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
137 return ret;
138 }
139
140 *val = ret;
141 return 0;
142}
143
144
145static int adp8870_write(struct i2c_client *client, u8 reg, u8 val)
146{
147 int ret = i2c_smbus_write_byte_data(client, reg, val);
148 if (ret)
149 dev_err(&client->dev, "failed to write\n");
150
151 return ret;
152}
153
154static 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) == 0)) {
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
173static 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)
196static void adp8870_led_work(struct work_struct *work)
197{
198 struct adp8870_led *led = container_of(work, struct adp8870_led, work);
199 adp8870_write(led->client, ADP8870_ISC1 + led->id - 1,
200 led->new_brightness >> 1);
201}
202
203static 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
216static 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
239static int __devinit adp8870_led_probe(struct i2c_client *client)
240{
241 struct adp8870_backlight_platform_data *pdata =
242 client->dev.platform_data;
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
249 led = kcalloc(pdata->num_leds, sizeof(*led), GFP_KERNEL);
250 if (led == NULL) {
251 dev_err(&client->dev, "failed to alloc memory\n");
252 return -ENOMEM;
253 }
254
255 ret = adp8870_write(client, ADP8870_ISCLAW, pdata->led_fade_law);
256 if (ret)
257 goto err_free;
258
259 ret = adp8870_write(client, ADP8870_ISCT1,
260 (pdata->led_on_time & 0x3) << 6);
261 if (ret)
262 goto err_free;
263
264 ret = adp8870_write(client, ADP8870_ISCF,
265 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
266 if (ret)
267 goto err_free;
268
269 for (i = 0; i < pdata->num_leds; ++i) {
270 cur_led = &pdata->leds[i];
271 led_dat = &led[i];
272
273 led_dat->id = cur_led->flags & ADP8870_FLAG_LED_MASK;
274
275 if (led_dat->id > 7 || led_dat->id < 1) {
276 dev_err(&client->dev, "Invalid LED ID %d\n",
277 led_dat->id);
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 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 err_free:
322 kfree(led);
323
324 return ret;
325}
326
327static int __devexit adp8870_led_remove(struct i2c_client *client)
328{
329 struct adp8870_backlight_platform_data *pdata =
330 client->dev.platform_data;
331 struct adp8870_bl *data = i2c_get_clientdata(client);
332 int i;
333
334 for (i = 0; i < pdata->num_leds; i++) {
335 led_classdev_unregister(&data->led[i].cdev);
336 cancel_work_sync(&data->led[i].work);
337 }
338
339 kfree(data->led);
340 return 0;
341}
342#else
343static int __devinit adp8870_led_probe(struct i2c_client *client)
344{
345 return 0;
346}
347
348static int __devexit adp8870_led_remove(struct i2c_client *client)
349{
350 return 0;
351}
352#endif
353
354static int adp8870_bl_set(struct backlight_device *bl, int brightness)
355{
356 struct adp8870_bl *data = bl_get_data(bl);
357 struct i2c_client *client = data->client;
358 int ret = 0;
359
360 if (data->pdata->en_ambl_sens) {
361 if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) {
362 /* Disable Ambient Light auto adjust */
363 ret = adp8870_clr_bits(client, ADP8870_MDCR,
364 CMP_AUTOEN);
365 if (ret)
366 return ret;
367 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
368 if (ret)
369 return ret;
370 } else {
371 /*
372 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
373 * restore daylight l1 sysfs brightness
374 */
375 ret = adp8870_write(client, ADP8870_BLMX1,
376 data->cached_daylight_max);
377 if (ret)
378 return ret;
379
380 ret = adp8870_set_bits(client, ADP8870_MDCR,
381 CMP_AUTOEN);
382 if (ret)
383 return ret;
384 }
385 } else {
386 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
387 if (ret)
388 return ret;
389 }
390
391 if (data->current_brightness && brightness == 0)
392 ret = adp8870_set_bits(client,
393 ADP8870_MDCR, DIM_EN);
394 else if (data->current_brightness == 0 && brightness)
395 ret = adp8870_clr_bits(client,
396 ADP8870_MDCR, DIM_EN);
397
398 if (!ret)
399 data->current_brightness = brightness;
400
401 return ret;
402}
403
404static int adp8870_bl_update_status(struct backlight_device *bl)
405{
406 int brightness = bl->props.brightness;
407 if (bl->props.power != FB_BLANK_UNBLANK)
408 brightness = 0;
409
410 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
411 brightness = 0;
412
413 return adp8870_bl_set(bl, brightness);
414}
415
416static int adp8870_bl_get_brightness(struct backlight_device *bl)
417{
418 struct adp8870_bl *data = bl_get_data(bl);
419
420 return data->current_brightness;
421}
422
423static const struct backlight_ops adp8870_bl_ops = {
424 .update_status = adp8870_bl_update_status,
425 .get_brightness = adp8870_bl_get_brightness,
426};
427
428static int adp8870_bl_setup(struct backlight_device *bl)
429{
430 struct adp8870_bl *data = bl_get_data(bl);
431 struct i2c_client *client = data->client;
432 struct adp8870_backlight_platform_data *pdata = data->pdata;
433 int ret = 0;
434
435 ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign);
436 if (ret)
437 return ret;
438
439 ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign);
440 if (ret)
441 return ret;
442
443 ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max);
444 if (ret)
445 return ret;
446
447 ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim);
448 if (ret)
449 return ret;
450
451 if (pdata->en_ambl_sens) {
452 data->cached_daylight_max = pdata->l1_daylight_max;
453 ret = adp8870_write(client, ADP8870_BLMX2,
454 pdata->l2_bright_max);
455 if (ret)
456 return ret;
457 ret = adp8870_write(client, ADP8870_BLDM2,
458 pdata->l2_bright_dim);
459 if (ret)
460 return ret;
461
462 ret = adp8870_write(client, ADP8870_BLMX3,
463 pdata->l3_office_max);
464 if (ret)
465 return ret;
466 ret = adp8870_write(client, ADP8870_BLDM3,
467 pdata->l3_office_dim);
468 if (ret)
469 return ret;
470
471 ret = adp8870_write(client, ADP8870_BLMX4,
472 pdata->l4_indoor_max);
473 if (ret)
474 return ret;
475
476 ret = adp8870_write(client, ADP8870_BLDM4,
477 pdata->l4_indor_dim);
478 if (ret)
479 return ret;
480
481 ret = adp8870_write(client, ADP8870_BLMX5,
482 pdata->l5_dark_max);
483 if (ret)
484 return ret;
485
486 ret = adp8870_write(client, ADP8870_BLDM5,
487 pdata->l5_dark_dim);
488 if (ret)
489 return ret;
490
491 ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip);
492 if (ret)
493 return ret;
494
495 ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst);
496 if (ret)
497 return ret;
498
499 ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip);
500 if (ret)
501 return ret;
502
503 ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst);
504 if (ret)
505 return ret;
506
507 ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip);
508 if (ret)
509 return ret;
510
511 ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst);
512 if (ret)
513 return ret;
514
515 ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip);
516 if (ret)
517 return ret;
518
519 ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst);
520 if (ret)
521 return ret;
522
523 ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN |
524 L3_EN | L2_EN);
525 if (ret)
526 return ret;
527
528 ret = adp8870_write(client, ADP8870_CMP_CTL,
529 ALS_CMPR_CFG_VAL(pdata->abml_filt));
530 if (ret)
531 return ret;
532 }
533
534 ret = adp8870_write(client, ADP8870_CFGR,
535 BL_CFGR_VAL(pdata->bl_fade_law, 0));
536 if (ret)
537 return ret;
538
539 ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in,
540 pdata->bl_fade_out));
541 if (ret)
542 return ret;
543 /*
544 * ADP8870 Rev0 requires GDWN_DIS bit set
545 */
546
547 ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY |
548 (data->revid == 0 ? GDWN_DIS : 0));
549
550 return ret;
551}
552
553static ssize_t adp8870_show(struct device *dev, char *buf, int reg)
554{
555 struct adp8870_bl *data = dev_get_drvdata(dev);
556 int error;
557 uint8_t reg_val;
558
559 mutex_lock(&data->lock);
560 error = adp8870_read(data->client, reg, &reg_val);
561 mutex_unlock(&data->lock);
562
563 if (error < 0)
564 return error;
565
566 return sprintf(buf, "%u\n", reg_val);
567}
568
569static ssize_t adp8870_store(struct device *dev, const char *buf,
570 size_t count, int reg)
571{
572 struct adp8870_bl *data = dev_get_drvdata(dev);
573 unsigned long val;
574 int ret;
575
576 ret = strict_strtoul(buf, 10, &val);
577 if (ret)
578 return ret;
579
580 mutex_lock(&data->lock);
581 adp8870_write(data->client, reg, val);
582 mutex_unlock(&data->lock);
583
584 return count;
585}
586
587static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev,
588 struct device_attribute *attr, char *buf)
589{
590 return adp8870_show(dev, buf, ADP8870_BLMX5);
591}
592
593static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev,
594 struct device_attribute *attr, const char *buf, size_t count)
595{
596 return adp8870_store(dev, buf, count, ADP8870_BLMX5);
597}
598static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show,
599 adp8870_bl_l5_dark_max_store);
600
601
602static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev,
603 struct device_attribute *attr, char *buf)
604{
605 return adp8870_show(dev, buf, ADP8870_BLMX4);
606}
607
608static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev,
609 struct device_attribute *attr, const char *buf, size_t count)
610{
611 return adp8870_store(dev, buf, count, ADP8870_BLMX4);
612}
613static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show,
614 adp8870_bl_l4_indoor_max_store);
615
616
617static ssize_t adp8870_bl_l3_office_max_show(struct device *dev,
618 struct device_attribute *attr, char *buf)
619{
620 return adp8870_show(dev, buf, ADP8870_BLMX3);
621}
622
623static ssize_t adp8870_bl_l3_office_max_store(struct device *dev,
624 struct device_attribute *attr, const char *buf, size_t count)
625{
626 return adp8870_store(dev, buf, count, ADP8870_BLMX3);
627}
628
629static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show,
630 adp8870_bl_l3_office_max_store);
631
632static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev,
633 struct device_attribute *attr, char *buf)
634{
635 return adp8870_show(dev, buf, ADP8870_BLMX2);
636}
637
638static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev,
639 struct device_attribute *attr, const char *buf, size_t count)
640{
641 return adp8870_store(dev, buf, count, ADP8870_BLMX2);
642}
643static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show,
644 adp8870_bl_l2_bright_max_store);
645
646static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev,
647 struct device_attribute *attr, char *buf)
648{
649 return adp8870_show(dev, buf, ADP8870_BLMX1);
650}
651
652static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev,
653 struct device_attribute *attr, const char *buf, size_t count)
654{
655 struct adp8870_bl *data = dev_get_drvdata(dev);
656 int ret = strict_strtoul(buf, 10, &data->cached_daylight_max);
657 if (ret)
658 return ret;
659
660 return adp8870_store(dev, buf, count, ADP8870_BLMX1);
661}
662static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show,
663 adp8870_bl_l1_daylight_max_store);
664
665static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev,
666 struct device_attribute *attr, char *buf)
667{
668 return adp8870_show(dev, buf, ADP8870_BLDM5);
669}
670
671static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev,
672 struct device_attribute *attr,
673 const char *buf, size_t count)
674{
675 return adp8870_store(dev, buf, count, ADP8870_BLDM5);
676}
677static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show,
678 adp8870_bl_l5_dark_dim_store);
679
680static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev,
681 struct device_attribute *attr, char *buf)
682{
683 return adp8870_show(dev, buf, ADP8870_BLDM4);
684}
685
686static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev,
687 struct device_attribute *attr,
688 const char *buf, size_t count)
689{
690 return adp8870_store(dev, buf, count, ADP8870_BLDM4);
691}
692static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show,
693 adp8870_bl_l4_indoor_dim_store);
694
695
696static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev,
697 struct device_attribute *attr, char *buf)
698{
699 return adp8870_show(dev, buf, ADP8870_BLDM3);
700}
701
702static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev,
703 struct device_attribute *attr,
704 const char *buf, size_t count)
705{
706 return adp8870_store(dev, buf, count, ADP8870_BLDM3);
707}
708static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show,
709 adp8870_bl_l3_office_dim_store);
710
711static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev,
712 struct device_attribute *attr, char *buf)
713{
714 return adp8870_show(dev, buf, ADP8870_BLDM2);
715}
716
717static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev,
718 struct device_attribute *attr,
719 const char *buf, size_t count)
720{
721 return adp8870_store(dev, buf, count, ADP8870_BLDM2);
722}
723static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show,
724 adp8870_bl_l2_bright_dim_store);
725
726static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev,
727 struct device_attribute *attr, char *buf)
728{
729 return adp8870_show(dev, buf, ADP8870_BLDM1);
730}
731
732static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev,
733 struct device_attribute *attr,
734 const char *buf, size_t count)
735{
736 return adp8870_store(dev, buf, count, ADP8870_BLDM1);
737}
738static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show,
739 adp8870_bl_l1_daylight_dim_store);
740
741#ifdef ADP8870_EXT_FEATURES
742static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev,
743 struct device_attribute *attr, char *buf)
744{
745 struct adp8870_bl *data = dev_get_drvdata(dev);
746 int error;
747 uint8_t reg_val;
748 uint16_t ret_val;
749
750 mutex_lock(&data->lock);
751 error = adp8870_read(data->client, ADP8870_PH1LEVL, &reg_val);
752 if (error < 0) {
753 mutex_unlock(&data->lock);
754 return error;
755 }
756 ret_val = reg_val;
757 error = adp8870_read(data->client, ADP8870_PH1LEVH, &reg_val);
758 mutex_unlock(&data->lock);
759
760 if (error < 0)
761 return error;
762
763 /* Return 13-bit conversion value for the first light sensor */
764 ret_val += (reg_val & 0x1F) << 8;
765
766 return sprintf(buf, "%u\n", ret_val);
767}
768static DEVICE_ATTR(ambient_light_level, 0444,
769 adp8870_bl_ambient_light_level_show, NULL);
770
771static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev,
772 struct device_attribute *attr, char *buf)
773{
774 struct adp8870_bl *data = dev_get_drvdata(dev);
775 int error;
776 uint8_t reg_val;
777
778 mutex_lock(&data->lock);
779 error = adp8870_read(data->client, ADP8870_CFGR, &reg_val);
780 mutex_unlock(&data->lock);
781
782 if (error < 0)
783 return error;
784
785 return sprintf(buf, "%u\n",
786 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
787}
788
789static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
790 struct device_attribute *attr,
791 const char *buf, size_t count)
792{
793 struct adp8870_bl *data = dev_get_drvdata(dev);
794 unsigned long val;
795 uint8_t reg_val;
796 int ret;
797
798 ret = strict_strtoul(buf, 10, &val);
799 if (ret)
800 return ret;
801
802 if (val == 0) {
803 /* Enable automatic ambient light sensing */
804 adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
805 } else if ((val > 0) && (val < 6)) {
806 /* Disable automatic ambient light sensing */
807 adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
808
809 /* Set user supplied ambient light zone */
810 mutex_lock(&data->lock);
811 adp8870_read(data->client, ADP8870_CFGR, &reg_val);
812 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
813 reg_val |= (val - 1) << CFGR_BLV_SHIFT;
814 adp8870_write(data->client, ADP8870_CFGR, reg_val);
815 mutex_unlock(&data->lock);
816 }
817
818 return count;
819}
820static DEVICE_ATTR(ambient_light_zone, 0664,
821 adp8870_bl_ambient_light_zone_show,
822 adp8870_bl_ambient_light_zone_store);
823#endif
824
825static 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
843static const struct attribute_group adp8870_bl_attr_group = {
844 .attrs = adp8870_bl_attributes,
845};
846
847static int __devinit 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 client->dev.platform_data;
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 = kzalloc(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.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS;
893 bl = backlight_device_register(dev_driver_string(&client->dev),
894 &client->dev, data, &adp8870_bl_ops, &props);
895 if (IS_ERR(bl)) {
896 dev_err(&client->dev, "failed to register backlight\n");
897 ret = PTR_ERR(bl);
898 goto out2;
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
907 if (ret) {
908 dev_err(&client->dev, "failed to register sysfs\n");
909 goto out1;
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
927out:
928 if (data->pdata->en_ambl_sens)
929 sysfs_remove_group(&data->bl->dev.kobj,
930 &adp8870_bl_attr_group);
931out1:
932 backlight_device_unregister(bl);
933out2:
934 i2c_set_clientdata(client, NULL);
935 kfree(data);
936
937 return ret;
938}
939
940static int __devexit adp8870_remove(struct i2c_client *client)
941{
942 struct adp8870_bl *data = i2c_get_clientdata(client);
943
944 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
945
946 if (data->led)
947 adp8870_led_remove(client);
948
949 if (data->pdata->en_ambl_sens)
950 sysfs_remove_group(&data->bl->dev.kobj,
951 &adp8870_bl_attr_group);
952
953 backlight_device_unregister(data->bl);
954 i2c_set_clientdata(client, NULL);
955 kfree(data);
956
957 return 0;
958}
959
960#ifdef CONFIG_PM
961static int adp8870_i2c_suspend(struct i2c_client *client, pm_message_t message)
962{
963 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
964
965 return 0;
966}
967
968static int adp8870_i2c_resume(struct i2c_client *client)
969{
970 adp8870_set_bits(client, ADP8870_MDCR, NSTBY);
971
972 return 0;
973}
974#else
975#define adp8870_i2c_suspend NULL
976#define adp8870_i2c_resume NULL
977#endif
978
979static const struct i2c_device_id adp8870_id[] = {
980 { "adp8870", 0 },
981 { }
982};
983MODULE_DEVICE_TABLE(i2c, adp8870_id);
984
985static struct i2c_driver adp8870_driver = {
986 .driver = {
987 .name = KBUILD_MODNAME,
988 },
989 .probe = adp8870_probe,
990 .remove = __devexit_p(adp8870_remove),
991 .suspend = adp8870_i2c_suspend,
992 .resume = adp8870_i2c_resume,
993 .id_table = adp8870_id,
994};
995
996static int __init adp8870_init(void)
997{
998 return i2c_add_driver(&adp8870_driver);
999}
1000module_init(adp8870_init);
1001
1002static void __exit adp8870_exit(void)
1003{
1004 i2c_del_driver(&adp8870_driver);
1005}
1006module_exit(adp8870_exit);
1007
1008MODULE_LICENSE("GPL v2");
1009MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
1010MODULE_DESCRIPTION("ADP8870 Backlight driver");
1011MODULE_ALIAS("platform:adp8870-backlight");
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