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[media] omap3isp: Fix crash caused by subdevs now having a pointer to devnodes
[linux/fpc-iii.git] / drivers / video / backlight / adp8870_bl.c
blob6c68a6899e8769c0f131c91860e3467240bcb87c
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) == 0)) {
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 __devinit 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
248 led = kcalloc(pdata->num_leds, sizeof(*led), 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 goto err_free;
257
258 ret = adp8870_write(client, ADP8870_ISCT1,
259 (pdata->led_on_time & 0x3) << 6);
260 if (ret)
261 goto err_free;
262
263 ret = adp8870_write(client, ADP8870_ISCF,
264 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
265 if (ret)
266 goto err_free;
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 err_free:
321 kfree(led);
322
323 return ret;
324 }
325
326 static int __devexit adp8870_led_remove(struct i2c_client *client)
327 {
328 struct adp8870_backlight_platform_data *pdata =
329 client->dev.platform_data;
330 struct adp8870_bl *data = i2c_get_clientdata(client);
331 int i;
332
333 for (i = 0; i < pdata->num_leds; i++) {
334 led_classdev_unregister(&data->led[i].cdev);
335 cancel_work_sync(&data->led[i].work);
336 }
337
338 kfree(data->led);
339 return 0;
340 }
341 #else
342 static int __devinit adp8870_led_probe(struct i2c_client *client)
343 {
344 return 0;
345 }
346
347 static int __devexit adp8870_led_remove(struct i2c_client *client)
348 {
349 return 0;
350 }
351 #endif
352
353 static int adp8870_bl_set(struct backlight_device *bl, int brightness)
354 {
355 struct adp8870_bl *data = bl_get_data(bl);
356 struct i2c_client *client = data->client;
357 int ret = 0;
358
359 if (data->pdata->en_ambl_sens) {
360 if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) {
361 /* Disable Ambient Light auto adjust */
362 ret = adp8870_clr_bits(client, ADP8870_MDCR,
363 CMP_AUTOEN);
364 if (ret)
365 return ret;
366 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
367 if (ret)
368 return ret;
369 } else {
370 /*
371 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
372 * restore daylight l1 sysfs brightness
373 */
374 ret = adp8870_write(client, ADP8870_BLMX1,
375 data->cached_daylight_max);
376 if (ret)
377 return ret;
378
379 ret = adp8870_set_bits(client, ADP8870_MDCR,
380 CMP_AUTOEN);
381 if (ret)
382 return ret;
383 }
384 } else {
385 ret = adp8870_write(client, ADP8870_BLMX1, brightness);
386 if (ret)
387 return ret;
388 }
389
390 if (data->current_brightness && brightness == 0)
391 ret = adp8870_set_bits(client,
392 ADP8870_MDCR, DIM_EN);
393 else if (data->current_brightness == 0 && brightness)
394 ret = adp8870_clr_bits(client,
395 ADP8870_MDCR, DIM_EN);
396
397 if (!ret)
398 data->current_brightness = brightness;
399
400 return ret;
401 }
402
403 static int adp8870_bl_update_status(struct backlight_device *bl)
404 {
405 int brightness = bl->props.brightness;
406 if (bl->props.power != FB_BLANK_UNBLANK)
407 brightness = 0;
408
409 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
410 brightness = 0;
411
412 return adp8870_bl_set(bl, brightness);
413 }
414
415 static int adp8870_bl_get_brightness(struct backlight_device *bl)
416 {
417 struct adp8870_bl *data = bl_get_data(bl);
418
419 return data->current_brightness;
420 }
421
422 static const struct backlight_ops adp8870_bl_ops = {
423 .update_status = adp8870_bl_update_status,
424 .get_brightness = adp8870_bl_get_brightness,
425 };
426
427 static int adp8870_bl_setup(struct backlight_device *bl)
428 {
429 struct adp8870_bl *data = bl_get_data(bl);
430 struct i2c_client *client = data->client;
431 struct adp8870_backlight_platform_data *pdata = data->pdata;
432 int ret = 0;
433
434 ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign);
435 if (ret)
436 return ret;
437
438 ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign);
439 if (ret)
440 return ret;
441
442 ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max);
443 if (ret)
444 return ret;
445
446 ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim);
447 if (ret)
448 return ret;
449
450 if (pdata->en_ambl_sens) {
451 data->cached_daylight_max = pdata->l1_daylight_max;
452 ret = adp8870_write(client, ADP8870_BLMX2,
453 pdata->l2_bright_max);
454 if (ret)
455 return ret;
456 ret = adp8870_write(client, ADP8870_BLDM2,
457 pdata->l2_bright_dim);
458 if (ret)
459 return ret;
460
461 ret = adp8870_write(client, ADP8870_BLMX3,
462 pdata->l3_office_max);
463 if (ret)
464 return ret;
465 ret = adp8870_write(client, ADP8870_BLDM3,
466 pdata->l3_office_dim);
467 if (ret)
468 return ret;
469
470 ret = adp8870_write(client, ADP8870_BLMX4,
471 pdata->l4_indoor_max);
472 if (ret)
473 return ret;
474
475 ret = adp8870_write(client, ADP8870_BLDM4,
476 pdata->l4_indor_dim);
477 if (ret)
478 return ret;
479
480 ret = adp8870_write(client, ADP8870_BLMX5,
481 pdata->l5_dark_max);
482 if (ret)
483 return ret;
484
485 ret = adp8870_write(client, ADP8870_BLDM5,
486 pdata->l5_dark_dim);
487 if (ret)
488 return ret;
489
490 ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip);
491 if (ret)
492 return ret;
493
494 ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst);
495 if (ret)
496 return ret;
497
498 ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip);
499 if (ret)
500 return ret;
501
502 ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst);
503 if (ret)
504 return ret;
505
506 ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip);
507 if (ret)
508 return ret;
509
510 ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst);
511 if (ret)
512 return ret;
513
514 ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip);
515 if (ret)
516 return ret;
517
518 ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst);
519 if (ret)
520 return ret;
521
522 ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN |
523 L3_EN | L2_EN);
524 if (ret)
525 return ret;
526
527 ret = adp8870_write(client, ADP8870_CMP_CTL,
528 ALS_CMPR_CFG_VAL(pdata->abml_filt));
529 if (ret)
530 return ret;
531 }
532
533 ret = adp8870_write(client, ADP8870_CFGR,
534 BL_CFGR_VAL(pdata->bl_fade_law, 0));
535 if (ret)
536 return ret;
537
538 ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in,
539 pdata->bl_fade_out));
540 if (ret)
541 return ret;
542 /*
543 * ADP8870 Rev0 requires GDWN_DIS bit set
544 */
545
546 ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY |
547 (data->revid == 0 ? GDWN_DIS : 0));
548
549 return ret;
550 }
551
552 static ssize_t adp8870_show(struct device *dev, char *buf, int reg)
553 {
554 struct adp8870_bl *data = dev_get_drvdata(dev);
555 int error;
556 uint8_t reg_val;
557
558 mutex_lock(&data->lock);
559 error = adp8870_read(data->client, reg, &reg_val);
560 mutex_unlock(&data->lock);
561
562 if (error < 0)
563 return error;
564
565 return sprintf(buf, "%u\n", reg_val);
566 }
567
568 static ssize_t adp8870_store(struct device *dev, const char *buf,
569 size_t count, int reg)
570 {
571 struct adp8870_bl *data = dev_get_drvdata(dev);
572 unsigned long val;
573 int ret;
574
575 ret = strict_strtoul(buf, 10, &val);
576 if (ret)
577 return ret;
578
579 mutex_lock(&data->lock);
580 adp8870_write(data->client, reg, val);
581 mutex_unlock(&data->lock);
582
583 return count;
584 }
585
586 static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev,
587 struct device_attribute *attr, char *buf)
588 {
589 return adp8870_show(dev, buf, ADP8870_BLMX5);
590 }
591
592 static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev,
593 struct device_attribute *attr, const char *buf, size_t count)
594 {
595 return adp8870_store(dev, buf, count, ADP8870_BLMX5);
596 }
597 static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show,
598 adp8870_bl_l5_dark_max_store);
599
600
601 static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev,
602 struct device_attribute *attr, char *buf)
603 {
604 return adp8870_show(dev, buf, ADP8870_BLMX4);
605 }
606
607 static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev,
608 struct device_attribute *attr, const char *buf, size_t count)
609 {
610 return adp8870_store(dev, buf, count, ADP8870_BLMX4);
611 }
612 static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show,
613 adp8870_bl_l4_indoor_max_store);
614
615
616 static ssize_t adp8870_bl_l3_office_max_show(struct device *dev,
617 struct device_attribute *attr, char *buf)
618 {
619 return adp8870_show(dev, buf, ADP8870_BLMX3);
620 }
621
622 static ssize_t adp8870_bl_l3_office_max_store(struct device *dev,
623 struct device_attribute *attr, const char *buf, size_t count)
624 {
625 return adp8870_store(dev, buf, count, ADP8870_BLMX3);
626 }
627
628 static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show,
629 adp8870_bl_l3_office_max_store);
630
631 static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev,
632 struct device_attribute *attr, char *buf)
633 {
634 return adp8870_show(dev, buf, ADP8870_BLMX2);
635 }
636
637 static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev,
638 struct device_attribute *attr, const char *buf, size_t count)
639 {
640 return adp8870_store(dev, buf, count, ADP8870_BLMX2);
641 }
642 static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show,
643 adp8870_bl_l2_bright_max_store);
644
645 static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev,
646 struct device_attribute *attr, char *buf)
647 {
648 return adp8870_show(dev, buf, ADP8870_BLMX1);
649 }
650
651 static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev,
652 struct device_attribute *attr, const char *buf, size_t count)
653 {
654 struct adp8870_bl *data = dev_get_drvdata(dev);
655 int ret = strict_strtoul(buf, 10, &data->cached_daylight_max);
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 = strict_strtoul(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 __devinit 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 client->dev.platform_data;
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 = kzalloc(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 = 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
927 out:
928 if (data->pdata->en_ambl_sens)
929 sysfs_remove_group(&data->bl->dev.kobj,
930 &adp8870_bl_attr_group);
931 out1:
932 backlight_device_unregister(bl);
933 out2:
934 kfree(data);
935
936 return ret;
937 }
938
939 static int __devexit adp8870_remove(struct i2c_client *client)
940 {
941 struct adp8870_bl *data = i2c_get_clientdata(client);
942
943 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
944
945 if (data->led)
946 adp8870_led_remove(client);
947
948 if (data->pdata->en_ambl_sens)
949 sysfs_remove_group(&data->bl->dev.kobj,
950 &adp8870_bl_attr_group);
951
952 backlight_device_unregister(data->bl);
953 kfree(data);
954
955 return 0;
956 }
957
958 #ifdef CONFIG_PM
959 static int adp8870_i2c_suspend(struct i2c_client *client, pm_message_t message)
960 {
961 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
962
963 return 0;
964 }
965
966 static int adp8870_i2c_resume(struct i2c_client *client)
967 {
968 adp8870_set_bits(client, ADP8870_MDCR, NSTBY);
969
970 return 0;
971 }
972 #else
973 #define adp8870_i2c_suspend NULL
974 #define adp8870_i2c_resume NULL
975 #endif
976
977 static const struct i2c_device_id adp8870_id[] = {
978 { "adp8870", 0 },
979 { }
980 };
981 MODULE_DEVICE_TABLE(i2c, adp8870_id);
982
983 static struct i2c_driver adp8870_driver = {
984 .driver = {
985 .name = KBUILD_MODNAME,
986 },
987 .probe = adp8870_probe,
988 .remove = __devexit_p(adp8870_remove),
989 .suspend = adp8870_i2c_suspend,
990 .resume = adp8870_i2c_resume,
991 .id_table = adp8870_id,
992 };
993
994 static int __init adp8870_init(void)
995 {
996 return i2c_add_driver(&adp8870_driver);
997 }
998 module_init(adp8870_init);
999
1000 static void __exit adp8870_exit(void)
1001 {
1002 i2c_del_driver(&adp8870_driver);
1003 }
1004 module_exit(adp8870_exit);
1005
1006 MODULE_LICENSE("GPL v2");
1007 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
1008 MODULE_DESCRIPTION("ADP8870 Backlight driver");
1009 MODULE_ALIAS("i2c:adp8870-backlight");
Linux with added FPC-III support