blob: 77d1fdba597fb561037d865176f261989b908845 [file] [log] [blame]
Michael Hennerich82fd53b2010-04-30 14:09:51 -07001/*
2 * Backlight driver for Analog Devices ADP8860 Backlight Devices
3 *
4 * Copyright 2009-2010 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <linux/module.h>
Michael Hennerich82fd53b2010-04-30 14:09:51 -070010#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>
Randy Dunlap3f43f8b2010-05-12 13:49:12 -070018#include <linux/slab.h>
Michael Hennerich82fd53b2010-04-30 14:09:51 -070019#include <linux/workqueue.h>
20
21#include <linux/i2c/adp8860.h>
22#define ADP8860_EXT_FEATURES
23#define ADP8860_USE_LEDS
24
25#define ADP8860_MFDVID 0x00 /* Manufacturer and device ID */
26#define ADP8860_MDCR 0x01 /* Device mode and status */
27#define ADP8860_MDCR2 0x02 /* Device mode and Status Register 2 */
28#define ADP8860_INTR_EN 0x03 /* Interrupts enable */
29#define ADP8860_CFGR 0x04 /* Configuration register */
30#define ADP8860_BLSEN 0x05 /* Sink enable backlight or independent */
31#define ADP8860_BLOFF 0x06 /* Backlight off timeout */
32#define ADP8860_BLDIM 0x07 /* Backlight dim timeout */
33#define ADP8860_BLFR 0x08 /* Backlight fade in and out rates */
34#define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */
35#define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */
36#define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */
37#define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */
38#define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */
39#define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */
40#define ADP8860_ISCFR 0x0F /* Independent sink current fade control register */
41#define ADP8860_ISCC 0x10 /* Independent sink current control register */
42#define ADP8860_ISCT1 0x11 /* Independent Sink Current Timer Register LED[7:5] */
43#define ADP8860_ISCT2 0x12 /* Independent Sink Current Timer Register LED[4:1] */
44#define ADP8860_ISCF 0x13 /* Independent sink current fade register */
45#define ADP8860_ISC7 0x14 /* Independent Sink Current LED7 */
46#define ADP8860_ISC6 0x15 /* Independent Sink Current LED6 */
47#define ADP8860_ISC5 0x16 /* Independent Sink Current LED5 */
48#define ADP8860_ISC4 0x17 /* Independent Sink Current LED4 */
49#define ADP8860_ISC3 0x18 /* Independent Sink Current LED3 */
50#define ADP8860_ISC2 0x19 /* Independent Sink Current LED2 */
51#define ADP8860_ISC1 0x1A /* Independent Sink Current LED1 */
52#define ADP8860_CCFG 0x1B /* Comparator configuration */
53#define ADP8860_CCFG2 0x1C /* Second comparator configuration */
54#define ADP8860_L2_TRP 0x1D /* L2 comparator reference */
55#define ADP8860_L2_HYS 0x1E /* L2 hysteresis */
56#define ADP8860_L3_TRP 0x1F /* L3 comparator reference */
57#define ADP8860_L3_HYS 0x20 /* L3 hysteresis */
58#define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */
59#define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */
60#define ADP8860_PH2LEVL 0x23 /* Second phototransistor ambient light level-low byte register */
61#define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */
62
63#define ADP8860_MANUFID 0x0 /* Analog Devices ADP8860 Manufacturer ID */
Michael Hennerichc7c06d82010-05-26 03:00:59 -040064#define ADP8861_MANUFID 0x4 /* Analog Devices ADP8861 Manufacturer ID */
65#define ADP8863_MANUFID 0x2 /* Analog Devices ADP8863 Manufacturer ID */
66
Michael Hennerich82fd53b2010-04-30 14:09:51 -070067#define ADP8860_DEVID(x) ((x) & 0xF)
68#define ADP8860_MANID(x) ((x) >> 4)
69
70/* MDCR Device mode and status */
71#define INT_CFG (1 << 6)
72#define NSTBY (1 << 5)
73#define DIM_EN (1 << 4)
Michael Hennerichc7c06d82010-05-26 03:00:59 -040074#define GDWN_DIS (1 << 3)
Michael Hennerich82fd53b2010-04-30 14:09:51 -070075#define SIS_EN (1 << 2)
76#define CMP_AUTOEN (1 << 1)
77#define BLEN (1 << 0)
78
79/* ADP8860_CCFG Main ALS comparator level enable */
80#define L3_EN (1 << 1)
81#define L2_EN (1 << 0)
82
83#define CFGR_BLV_SHIFT 3
84#define CFGR_BLV_MASK 0x3
85#define ADP8860_FLAG_LED_MASK 0xFF
86
87#define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4))
88#define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))
89#define ALS_CCFG_VAL(filt) ((0x7 & filt) << 5)
90
Michael Hennerichc7c06d82010-05-26 03:00:59 -040091enum {
92 adp8860,
93 adp8861,
94 adp8863
95};
96
Michael Hennerich82fd53b2010-04-30 14:09:51 -070097struct adp8860_led {
98 struct led_classdev cdev;
99 struct work_struct work;
100 struct i2c_client *client;
101 enum led_brightness new_brightness;
102 int id;
103 int flags;
104};
105
106struct adp8860_bl {
107 struct i2c_client *client;
108 struct backlight_device *bl;
109 struct adp8860_led *led;
110 struct adp8860_backlight_platform_data *pdata;
111 struct mutex lock;
112 unsigned long cached_daylight_max;
113 int id;
114 int revid;
115 int current_brightness;
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400116 unsigned en_ambl_sens:1;
117 unsigned gdwn_dis:1;
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700118};
119
120static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val)
121{
122 int ret;
123
124 ret = i2c_smbus_read_byte_data(client, reg);
125 if (ret < 0) {
126 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
127 return ret;
128 }
129
130 *val = (uint8_t)ret;
131 return 0;
132}
133
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700134static int adp8860_write(struct i2c_client *client, u8 reg, u8 val)
135{
136 return i2c_smbus_write_byte_data(client, reg, val);
137}
138
139static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
140{
141 struct adp8860_bl *data = i2c_get_clientdata(client);
142 uint8_t reg_val;
143 int ret;
144
145 mutex_lock(&data->lock);
146
147 ret = adp8860_read(client, reg, &reg_val);
148
Axel Lin36c3e752012-01-20 14:34:05 -0800149 if (!ret && ((reg_val & bit_mask) != bit_mask)) {
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700150 reg_val |= bit_mask;
151 ret = adp8860_write(client, reg, reg_val);
152 }
153
154 mutex_unlock(&data->lock);
155 return ret;
156}
157
158static int adp8860_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
159{
160 struct adp8860_bl *data = i2c_get_clientdata(client);
161 uint8_t reg_val;
162 int ret;
163
164 mutex_lock(&data->lock);
165
166 ret = adp8860_read(client, reg, &reg_val);
167
168 if (!ret && (reg_val & bit_mask)) {
169 reg_val &= ~bit_mask;
170 ret = adp8860_write(client, reg, reg_val);
171 }
172
173 mutex_unlock(&data->lock);
174 return ret;
175}
176
177/*
178 * Independent sink / LED
179 */
180#if defined(ADP8860_USE_LEDS)
181static void adp8860_led_work(struct work_struct *work)
182{
183 struct adp8860_led *led = container_of(work, struct adp8860_led, work);
184 adp8860_write(led->client, ADP8860_ISC1 - led->id + 1,
185 led->new_brightness >> 1);
186}
187
188static void adp8860_led_set(struct led_classdev *led_cdev,
189 enum led_brightness value)
190{
191 struct adp8860_led *led;
192
193 led = container_of(led_cdev, struct adp8860_led, cdev);
194 led->new_brightness = value;
195 schedule_work(&led->work);
196}
197
198static int adp8860_led_setup(struct adp8860_led *led)
199{
200 struct i2c_client *client = led->client;
201 int ret = 0;
202
203 ret = adp8860_write(client, ADP8860_ISC1 - led->id + 1, 0);
204 ret |= adp8860_set_bits(client, ADP8860_ISCC, 1 << (led->id - 1));
205
206 if (led->id > 4)
207 ret |= adp8860_set_bits(client, ADP8860_ISCT1,
208 (led->flags & 0x3) << ((led->id - 5) * 2));
209 else
210 ret |= adp8860_set_bits(client, ADP8860_ISCT2,
211 (led->flags & 0x3) << ((led->id - 1) * 2));
212
213 return ret;
214}
215
216static int __devinit adp8860_led_probe(struct i2c_client *client)
217{
218 struct adp8860_backlight_platform_data *pdata =
219 client->dev.platform_data;
220 struct adp8860_bl *data = i2c_get_clientdata(client);
221 struct adp8860_led *led, *led_dat;
222 struct led_info *cur_led;
223 int ret, i;
224
Jingoo Han58875ea2012-05-29 15:07:21 -0700225 led = devm_kzalloc(&client->dev, sizeof(*led) * pdata->num_leds,
226 GFP_KERNEL);
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700227 if (led == NULL) {
228 dev_err(&client->dev, "failed to alloc memory\n");
229 return -ENOMEM;
230 }
231
232 ret = adp8860_write(client, ADP8860_ISCFR, pdata->led_fade_law);
233 ret = adp8860_write(client, ADP8860_ISCT1,
234 (pdata->led_on_time & 0x3) << 6);
235 ret |= adp8860_write(client, ADP8860_ISCF,
236 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
237
238 if (ret) {
239 dev_err(&client->dev, "failed to write\n");
Jingoo Han58875ea2012-05-29 15:07:21 -0700240 return ret;
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700241 }
242
243 for (i = 0; i < pdata->num_leds; ++i) {
244 cur_led = &pdata->leds[i];
245 led_dat = &led[i];
246
247 led_dat->id = cur_led->flags & ADP8860_FLAG_LED_MASK;
248
249 if (led_dat->id > 7 || led_dat->id < 1) {
250 dev_err(&client->dev, "Invalid LED ID %d\n",
251 led_dat->id);
252 goto err;
253 }
254
255 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {
256 dev_err(&client->dev, "LED %d used by Backlight\n",
257 led_dat->id);
258 goto err;
259 }
260
261 led_dat->cdev.name = cur_led->name;
262 led_dat->cdev.default_trigger = cur_led->default_trigger;
263 led_dat->cdev.brightness_set = adp8860_led_set;
264 led_dat->cdev.brightness = LED_OFF;
265 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;
266 led_dat->client = client;
267 led_dat->new_brightness = LED_OFF;
268 INIT_WORK(&led_dat->work, adp8860_led_work);
269
270 ret = led_classdev_register(&client->dev, &led_dat->cdev);
271 if (ret) {
272 dev_err(&client->dev, "failed to register LED %d\n",
273 led_dat->id);
274 goto err;
275 }
276
277 ret = adp8860_led_setup(led_dat);
278 if (ret) {
279 dev_err(&client->dev, "failed to write\n");
280 i++;
281 goto err;
282 }
283 }
284
285 data->led = led;
286
287 return 0;
288
289 err:
290 for (i = i - 1; i >= 0; --i) {
291 led_classdev_unregister(&led[i].cdev);
292 cancel_work_sync(&led[i].work);
293 }
294
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700295 return ret;
296}
297
298static int __devexit adp8860_led_remove(struct i2c_client *client)
299{
300 struct adp8860_backlight_platform_data *pdata =
301 client->dev.platform_data;
302 struct adp8860_bl *data = i2c_get_clientdata(client);
303 int i;
304
305 for (i = 0; i < pdata->num_leds; i++) {
306 led_classdev_unregister(&data->led[i].cdev);
307 cancel_work_sync(&data->led[i].work);
308 }
309
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700310 return 0;
311}
312#else
313static int __devinit adp8860_led_probe(struct i2c_client *client)
314{
315 return 0;
316}
317
318static int __devexit adp8860_led_remove(struct i2c_client *client)
319{
320 return 0;
321}
322#endif
323
324static int adp8860_bl_set(struct backlight_device *bl, int brightness)
325{
326 struct adp8860_bl *data = bl_get_data(bl);
327 struct i2c_client *client = data->client;
328 int ret = 0;
329
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400330 if (data->en_ambl_sens) {
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700331 if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) {
332 /* Disable Ambient Light auto adjust */
333 ret |= adp8860_clr_bits(client, ADP8860_MDCR,
334 CMP_AUTOEN);
335 ret |= adp8860_write(client, ADP8860_BLMX1, brightness);
336 } else {
337 /*
338 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
339 * restore daylight l1 sysfs brightness
340 */
341 ret |= adp8860_write(client, ADP8860_BLMX1,
342 data->cached_daylight_max);
343 ret |= adp8860_set_bits(client, ADP8860_MDCR,
344 CMP_AUTOEN);
345 }
346 } else
347 ret |= adp8860_write(client, ADP8860_BLMX1, brightness);
348
349 if (data->current_brightness && brightness == 0)
350 ret |= adp8860_set_bits(client,
351 ADP8860_MDCR, DIM_EN);
352 else if (data->current_brightness == 0 && brightness)
353 ret |= adp8860_clr_bits(client,
354 ADP8860_MDCR, DIM_EN);
355
356 if (!ret)
357 data->current_brightness = brightness;
358
359 return ret;
360}
361
362static int adp8860_bl_update_status(struct backlight_device *bl)
363{
364 int brightness = bl->props.brightness;
365 if (bl->props.power != FB_BLANK_UNBLANK)
366 brightness = 0;
367
368 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
369 brightness = 0;
370
371 return adp8860_bl_set(bl, brightness);
372}
373
374static int adp8860_bl_get_brightness(struct backlight_device *bl)
375{
376 struct adp8860_bl *data = bl_get_data(bl);
377
378 return data->current_brightness;
379}
380
381static const struct backlight_ops adp8860_bl_ops = {
382 .update_status = adp8860_bl_update_status,
383 .get_brightness = adp8860_bl_get_brightness,
384};
385
386static int adp8860_bl_setup(struct backlight_device *bl)
387{
388 struct adp8860_bl *data = bl_get_data(bl);
389 struct i2c_client *client = data->client;
390 struct adp8860_backlight_platform_data *pdata = data->pdata;
391 int ret = 0;
392
393 ret |= adp8860_write(client, ADP8860_BLSEN, ~pdata->bl_led_assign);
394 ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max);
395 ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim);
396
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400397 if (data->en_ambl_sens) {
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700398 data->cached_daylight_max = pdata->l1_daylight_max;
399 ret |= adp8860_write(client, ADP8860_BLMX2,
400 pdata->l2_office_max);
401 ret |= adp8860_write(client, ADP8860_BLDM2,
402 pdata->l2_office_dim);
403 ret |= adp8860_write(client, ADP8860_BLMX3,
404 pdata->l3_dark_max);
405 ret |= adp8860_write(client, ADP8860_BLDM3,
406 pdata->l3_dark_dim);
407
408 ret |= adp8860_write(client, ADP8860_L2_TRP, pdata->l2_trip);
409 ret |= adp8860_write(client, ADP8860_L2_HYS, pdata->l2_hyst);
410 ret |= adp8860_write(client, ADP8860_L3_TRP, pdata->l3_trip);
411 ret |= adp8860_write(client, ADP8860_L3_HYS, pdata->l3_hyst);
412 ret |= adp8860_write(client, ADP8860_CCFG, L2_EN | L3_EN |
413 ALS_CCFG_VAL(pdata->abml_filt));
414 }
415
416 ret |= adp8860_write(client, ADP8860_CFGR,
417 BL_CFGR_VAL(pdata->bl_fade_law, 0));
418
419 ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in,
420 pdata->bl_fade_out));
421
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400422 ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY |
423 (data->gdwn_dis ? GDWN_DIS : 0));
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700424
425 return ret;
426}
427
428static ssize_t adp8860_show(struct device *dev, char *buf, int reg)
429{
430 struct adp8860_bl *data = dev_get_drvdata(dev);
431 int error;
432 uint8_t reg_val;
433
434 mutex_lock(&data->lock);
435 error = adp8860_read(data->client, reg, &reg_val);
436 mutex_unlock(&data->lock);
437
438 if (error < 0)
439 return error;
440
441 return sprintf(buf, "%u\n", reg_val);
442}
443
444static ssize_t adp8860_store(struct device *dev, const char *buf,
445 size_t count, int reg)
446{
447 struct adp8860_bl *data = dev_get_drvdata(dev);
448 unsigned long val;
449 int ret;
450
Jingoo Han8dd9d7f2012-05-29 15:07:15 -0700451 ret = kstrtoul(buf, 10, &val);
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700452 if (ret)
453 return ret;
454
455 mutex_lock(&data->lock);
456 adp8860_write(data->client, reg, val);
457 mutex_unlock(&data->lock);
458
459 return count;
460}
461
462static ssize_t adp8860_bl_l3_dark_max_show(struct device *dev,
463 struct device_attribute *attr, char *buf)
464{
465 return adp8860_show(dev, buf, ADP8860_BLMX3);
466}
467
468static ssize_t adp8860_bl_l3_dark_max_store(struct device *dev,
469 struct device_attribute *attr, const char *buf, size_t count)
470{
471 return adp8860_store(dev, buf, count, ADP8860_BLMX3);
472}
473
474static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show,
475 adp8860_bl_l3_dark_max_store);
476
477static ssize_t adp8860_bl_l2_office_max_show(struct device *dev,
478 struct device_attribute *attr, char *buf)
479{
480 return adp8860_show(dev, buf, ADP8860_BLMX2);
481}
482
483static ssize_t adp8860_bl_l2_office_max_store(struct device *dev,
484 struct device_attribute *attr, const char *buf, size_t count)
485{
486 return adp8860_store(dev, buf, count, ADP8860_BLMX2);
487}
488static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show,
489 adp8860_bl_l2_office_max_store);
490
491static ssize_t adp8860_bl_l1_daylight_max_show(struct device *dev,
492 struct device_attribute *attr, char *buf)
493{
494 return adp8860_show(dev, buf, ADP8860_BLMX1);
495}
496
497static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev,
498 struct device_attribute *attr, const char *buf, size_t count)
499{
500 struct adp8860_bl *data = dev_get_drvdata(dev);
Jingoo Han8dd9d7f2012-05-29 15:07:15 -0700501 int ret = kstrtoul(buf, 10, &data->cached_daylight_max);
Michael Hennerich4f1aa842010-11-11 14:05:29 -0800502 if (ret)
503 return ret;
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700504
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700505 return adp8860_store(dev, buf, count, ADP8860_BLMX1);
506}
507static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show,
508 adp8860_bl_l1_daylight_max_store);
509
510static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev,
511 struct device_attribute *attr, char *buf)
512{
513 return adp8860_show(dev, buf, ADP8860_BLDM3);
514}
515
516static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev,
517 struct device_attribute *attr,
518 const char *buf, size_t count)
519{
520 return adp8860_store(dev, buf, count, ADP8860_BLDM3);
521}
522static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show,
523 adp8860_bl_l3_dark_dim_store);
524
525static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev,
526 struct device_attribute *attr, char *buf)
527{
528 return adp8860_show(dev, buf, ADP8860_BLDM2);
529}
530
531static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev,
532 struct device_attribute *attr,
533 const char *buf, size_t count)
534{
535 return adp8860_store(dev, buf, count, ADP8860_BLDM2);
536}
537static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show,
538 adp8860_bl_l2_office_dim_store);
539
540static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev,
541 struct device_attribute *attr, char *buf)
542{
543 return adp8860_show(dev, buf, ADP8860_BLDM1);
544}
545
546static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev,
547 struct device_attribute *attr,
548 const char *buf, size_t count)
549{
550 return adp8860_store(dev, buf, count, ADP8860_BLDM1);
551}
552static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show,
553 adp8860_bl_l1_daylight_dim_store);
554
555#ifdef ADP8860_EXT_FEATURES
556static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev,
557 struct device_attribute *attr, char *buf)
558{
559 struct adp8860_bl *data = dev_get_drvdata(dev);
560 int error;
561 uint8_t reg_val;
562 uint16_t ret_val;
563
564 mutex_lock(&data->lock);
565 error = adp8860_read(data->client, ADP8860_PH1LEVL, &reg_val);
566 ret_val = reg_val;
567 error |= adp8860_read(data->client, ADP8860_PH1LEVH, &reg_val);
568 mutex_unlock(&data->lock);
569
570 if (error < 0)
571 return error;
572
573 /* Return 13-bit conversion value for the first light sensor */
574 ret_val += (reg_val & 0x1F) << 8;
575
576 return sprintf(buf, "%u\n", ret_val);
577}
578static DEVICE_ATTR(ambient_light_level, 0444,
579 adp8860_bl_ambient_light_level_show, NULL);
580
581static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev,
582 struct device_attribute *attr, char *buf)
583{
584 struct adp8860_bl *data = dev_get_drvdata(dev);
585 int error;
586 uint8_t reg_val;
587
588 mutex_lock(&data->lock);
589 error = adp8860_read(data->client, ADP8860_CFGR, &reg_val);
590 mutex_unlock(&data->lock);
591
592 if (error < 0)
593 return error;
594
595 return sprintf(buf, "%u\n",
596 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
597}
598
599static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev,
600 struct device_attribute *attr,
601 const char *buf, size_t count)
602{
603 struct adp8860_bl *data = dev_get_drvdata(dev);
604 unsigned long val;
605 uint8_t reg_val;
606 int ret;
607
Jingoo Han8dd9d7f2012-05-29 15:07:15 -0700608 ret = kstrtoul(buf, 10, &val);
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700609 if (ret)
610 return ret;
611
612 if (val == 0) {
613 /* Enable automatic ambient light sensing */
614 adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
Michael Hennerichc7ce2502010-11-11 14:05:29 -0800615 } else if ((val > 0) && (val <= 3)) {
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700616 /* Disable automatic ambient light sensing */
617 adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
618
619 /* Set user supplied ambient light zone */
620 mutex_lock(&data->lock);
621 adp8860_read(data->client, ADP8860_CFGR, &reg_val);
622 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
Michael Hennerichc7ce2502010-11-11 14:05:29 -0800623 reg_val |= (val - 1) << CFGR_BLV_SHIFT;
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700624 adp8860_write(data->client, ADP8860_CFGR, reg_val);
625 mutex_unlock(&data->lock);
626 }
627
628 return count;
629}
630static DEVICE_ATTR(ambient_light_zone, 0664,
631 adp8860_bl_ambient_light_zone_show,
632 adp8860_bl_ambient_light_zone_store);
633#endif
634
635static struct attribute *adp8860_bl_attributes[] = {
636 &dev_attr_l3_dark_max.attr,
637 &dev_attr_l3_dark_dim.attr,
638 &dev_attr_l2_office_max.attr,
639 &dev_attr_l2_office_dim.attr,
640 &dev_attr_l1_daylight_max.attr,
641 &dev_attr_l1_daylight_dim.attr,
642#ifdef ADP8860_EXT_FEATURES
643 &dev_attr_ambient_light_level.attr,
644 &dev_attr_ambient_light_zone.attr,
645#endif
646 NULL
647};
648
649static const struct attribute_group adp8860_bl_attr_group = {
650 .attrs = adp8860_bl_attributes,
651};
652
653static int __devinit adp8860_probe(struct i2c_client *client,
654 const struct i2c_device_id *id)
655{
656 struct backlight_device *bl;
657 struct adp8860_bl *data;
658 struct adp8860_backlight_platform_data *pdata =
659 client->dev.platform_data;
Randy Dunlap3f43f8b2010-05-12 13:49:12 -0700660 struct backlight_properties props;
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700661 uint8_t reg_val;
662 int ret;
663
664 if (!i2c_check_functionality(client->adapter,
665 I2C_FUNC_SMBUS_BYTE_DATA)) {
666 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
667 return -EIO;
668 }
669
670 if (!pdata) {
671 dev_err(&client->dev, "no platform data?\n");
672 return -EINVAL;
673 }
674
Jingoo Han58875ea2012-05-29 15:07:21 -0700675 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700676 if (data == NULL)
677 return -ENOMEM;
678
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400679 ret = adp8860_read(client, ADP8860_MFDVID, &reg_val);
680 if (ret < 0)
Jingoo Han58875ea2012-05-29 15:07:21 -0700681 return ret;
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400682
683 switch (ADP8860_MANID(reg_val)) {
684 case ADP8863_MANUFID:
685 data->gdwn_dis = !!pdata->gdwn_dis;
686 case ADP8860_MANUFID:
687 data->en_ambl_sens = !!pdata->en_ambl_sens;
688 break;
689 case ADP8861_MANUFID:
690 data->gdwn_dis = !!pdata->gdwn_dis;
691 break;
692 default:
693 dev_err(&client->dev, "failed to probe\n");
Jingoo Han58875ea2012-05-29 15:07:21 -0700694 return -ENODEV;
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400695 }
696
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700697 /* It's confirmed that the DEVID field is actually a REVID */
698
699 data->revid = ADP8860_DEVID(reg_val);
700 data->client = client;
701 data->pdata = pdata;
702 data->id = id->driver_data;
703 data->current_brightness = 0;
704 i2c_set_clientdata(client, data);
705
Randy Dunlap3f43f8b2010-05-12 13:49:12 -0700706 memset(&props, 0, sizeof(props));
Matthew Garrettbb7ca742011-03-22 16:30:21 -0700707 props.type = BACKLIGHT_RAW;
Randy Dunlap3f43f8b2010-05-12 13:49:12 -0700708 props.max_brightness = ADP8860_MAX_BRIGHTNESS;
709
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700710 mutex_init(&data->lock);
711
712 bl = backlight_device_register(dev_driver_string(&client->dev),
Randy Dunlap3f43f8b2010-05-12 13:49:12 -0700713 &client->dev, data, &adp8860_bl_ops, &props);
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700714 if (IS_ERR(bl)) {
715 dev_err(&client->dev, "failed to register backlight\n");
Jingoo Han58875ea2012-05-29 15:07:21 -0700716 return PTR_ERR(bl);
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700717 }
718
Axel Lin6b19bad2011-07-25 17:11:59 -0700719 bl->props.brightness = ADP8860_MAX_BRIGHTNESS;
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700720
721 data->bl = bl;
722
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400723 if (data->en_ambl_sens)
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700724 ret = sysfs_create_group(&bl->dev.kobj,
725 &adp8860_bl_attr_group);
726
727 if (ret) {
728 dev_err(&client->dev, "failed to register sysfs\n");
729 goto out1;
730 }
731
732 ret = adp8860_bl_setup(bl);
733 if (ret) {
734 ret = -EIO;
735 goto out;
736 }
737
738 backlight_update_status(bl);
739
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400740 dev_info(&client->dev, "%s Rev.%d Backlight\n",
741 client->name, data->revid);
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700742
743 if (pdata->num_leds)
744 adp8860_led_probe(client);
745
746 return 0;
747
748out:
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400749 if (data->en_ambl_sens)
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700750 sysfs_remove_group(&data->bl->dev.kobj,
751 &adp8860_bl_attr_group);
752out1:
753 backlight_device_unregister(bl);
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700754
755 return ret;
756}
757
758static int __devexit adp8860_remove(struct i2c_client *client)
759{
760 struct adp8860_bl *data = i2c_get_clientdata(client);
761
762 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);
763
764 if (data->led)
765 adp8860_led_remove(client);
766
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400767 if (data->en_ambl_sens)
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700768 sysfs_remove_group(&data->bl->dev.kobj,
769 &adp8860_bl_attr_group);
770
771 backlight_device_unregister(data->bl);
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700772
773 return 0;
774}
775
776#ifdef CONFIG_PM
777static int adp8860_i2c_suspend(struct i2c_client *client, pm_message_t message)
778{
779 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);
780
781 return 0;
782}
783
784static int adp8860_i2c_resume(struct i2c_client *client)
785{
786 adp8860_set_bits(client, ADP8860_MDCR, NSTBY);
787
788 return 0;
789}
790#else
791#define adp8860_i2c_suspend NULL
792#define adp8860_i2c_resume NULL
793#endif
794
795static const struct i2c_device_id adp8860_id[] = {
Michael Hennerichc7c06d82010-05-26 03:00:59 -0400796 { "adp8860", adp8860 },
797 { "adp8861", adp8861 },
798 { "adp8863", adp8863 },
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700799 { }
800};
801MODULE_DEVICE_TABLE(i2c, adp8860_id);
802
803static struct i2c_driver adp8860_driver = {
804 .driver = {
805 .name = KBUILD_MODNAME,
806 },
807 .probe = adp8860_probe,
808 .remove = __devexit_p(adp8860_remove),
809 .suspend = adp8860_i2c_suspend,
810 .resume = adp8860_i2c_resume,
811 .id_table = adp8860_id,
812};
813
Axel Lin81ce6862012-03-23 15:01:59 -0700814module_i2c_driver(adp8860_driver);
Michael Hennerich82fd53b2010-04-30 14:09:51 -0700815
816MODULE_LICENSE("GPL v2");
817MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
818MODULE_DESCRIPTION("ADP8860 Backlight driver");
819MODULE_ALIAS("i2c:adp8860-backlight");