adp8860_bl.c revision 5e548f0f55a9f8165a3f36226ac5d3f42a05cf47
1/* 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> 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/slab.h> 19#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 */ 64#define ADP8861_MANUFID 0x4 /* Analog Devices ADP8861 Manufacturer ID */ 65#define ADP8863_MANUFID 0x2 /* Analog Devices ADP8863 Manufacturer ID */ 66 67#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) 74#define GDWN_DIS (1 << 3) 75#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 91enum { 92 adp8860, 93 adp8861, 94 adp8863 95}; 96 97struct 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; 116 unsigned en_ambl_sens:1; 117 unsigned gdwn_dis:1; 118}; 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 134static 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, ®_val); 148 149 if (!ret && ((reg_val & bit_mask) != bit_mask)) { 150 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, ®_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); 184 185 adp8860_write(led->client, ADP8860_ISC1 - led->id + 1, 186 led->new_brightness >> 1); 187} 188 189static void adp8860_led_set(struct led_classdev *led_cdev, 190 enum led_brightness value) 191{ 192 struct adp8860_led *led; 193 194 led = container_of(led_cdev, struct adp8860_led, cdev); 195 led->new_brightness = value; 196 schedule_work(&led->work); 197} 198 199static int adp8860_led_setup(struct adp8860_led *led) 200{ 201 struct i2c_client *client = led->client; 202 int ret = 0; 203 204 ret = adp8860_write(client, ADP8860_ISC1 - led->id + 1, 0); 205 ret |= adp8860_set_bits(client, ADP8860_ISCC, 1 << (led->id - 1)); 206 207 if (led->id > 4) 208 ret |= adp8860_set_bits(client, ADP8860_ISCT1, 209 (led->flags & 0x3) << ((led->id - 5) * 2)); 210 else 211 ret |= adp8860_set_bits(client, ADP8860_ISCT2, 212 (led->flags & 0x3) << ((led->id - 1) * 2)); 213 214 return ret; 215} 216 217static int adp8860_led_probe(struct i2c_client *client) 218{ 219 struct adp8860_backlight_platform_data *pdata = 220 dev_get_platdata(&client->dev); 221 struct adp8860_bl *data = i2c_get_clientdata(client); 222 struct adp8860_led *led, *led_dat; 223 struct led_info *cur_led; 224 int ret, i; 225 226 led = devm_kzalloc(&client->dev, sizeof(*led) * pdata->num_leds, 227 GFP_KERNEL); 228 if (led == NULL) 229 return -ENOMEM; 230 231 ret = adp8860_write(client, ADP8860_ISCFR, pdata->led_fade_law); 232 ret = adp8860_write(client, ADP8860_ISCT1, 233 (pdata->led_on_time & 0x3) << 6); 234 ret |= adp8860_write(client, ADP8860_ISCF, 235 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out)); 236 237 if (ret) { 238 dev_err(&client->dev, "failed to write\n"); 239 return ret; 240 } 241 242 for (i = 0; i < pdata->num_leds; ++i) { 243 cur_led = &pdata->leds[i]; 244 led_dat = &led[i]; 245 246 led_dat->id = cur_led->flags & ADP8860_FLAG_LED_MASK; 247 248 if (led_dat->id > 7 || led_dat->id < 1) { 249 dev_err(&client->dev, "Invalid LED ID %d\n", 250 led_dat->id); 251 ret = -EINVAL; 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 ret = -EBUSY; 259 goto err; 260 } 261 262 led_dat->cdev.name = cur_led->name; 263 led_dat->cdev.default_trigger = cur_led->default_trigger; 264 led_dat->cdev.brightness_set = adp8860_led_set; 265 led_dat->cdev.brightness = LED_OFF; 266 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT; 267 led_dat->client = client; 268 led_dat->new_brightness = LED_OFF; 269 INIT_WORK(&led_dat->work, adp8860_led_work); 270 271 ret = led_classdev_register(&client->dev, &led_dat->cdev); 272 if (ret) { 273 dev_err(&client->dev, "failed to register LED %d\n", 274 led_dat->id); 275 goto err; 276 } 277 278 ret = adp8860_led_setup(led_dat); 279 if (ret) { 280 dev_err(&client->dev, "failed to write\n"); 281 i++; 282 goto err; 283 } 284 } 285 286 data->led = led; 287 288 return 0; 289 290 err: 291 for (i = i - 1; i >= 0; --i) { 292 led_classdev_unregister(&led[i].cdev); 293 cancel_work_sync(&led[i].work); 294 } 295 296 return ret; 297} 298 299static int adp8860_led_remove(struct i2c_client *client) 300{ 301 struct adp8860_backlight_platform_data *pdata = 302 dev_get_platdata(&client->dev); 303 struct adp8860_bl *data = i2c_get_clientdata(client); 304 int i; 305 306 for (i = 0; i < pdata->num_leds; i++) { 307 led_classdev_unregister(&data->led[i].cdev); 308 cancel_work_sync(&data->led[i].work); 309 } 310 311 return 0; 312} 313#else 314static int adp8860_led_probe(struct i2c_client *client) 315{ 316 return 0; 317} 318 319static int adp8860_led_remove(struct i2c_client *client) 320{ 321 return 0; 322} 323#endif 324 325static int adp8860_bl_set(struct backlight_device *bl, int brightness) 326{ 327 struct adp8860_bl *data = bl_get_data(bl); 328 struct i2c_client *client = data->client; 329 int ret = 0; 330 331 if (data->en_ambl_sens) { 332 if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) { 333 /* Disable Ambient Light auto adjust */ 334 ret |= adp8860_clr_bits(client, ADP8860_MDCR, 335 CMP_AUTOEN); 336 ret |= adp8860_write(client, ADP8860_BLMX1, brightness); 337 } else { 338 /* 339 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust 340 * restore daylight l1 sysfs brightness 341 */ 342 ret |= adp8860_write(client, ADP8860_BLMX1, 343 data->cached_daylight_max); 344 ret |= adp8860_set_bits(client, ADP8860_MDCR, 345 CMP_AUTOEN); 346 } 347 } else 348 ret |= adp8860_write(client, ADP8860_BLMX1, brightness); 349 350 if (data->current_brightness && brightness == 0) 351 ret |= adp8860_set_bits(client, 352 ADP8860_MDCR, DIM_EN); 353 else if (data->current_brightness == 0 && brightness) 354 ret |= adp8860_clr_bits(client, 355 ADP8860_MDCR, DIM_EN); 356 357 if (!ret) 358 data->current_brightness = brightness; 359 360 return ret; 361} 362 363static int adp8860_bl_update_status(struct backlight_device *bl) 364{ 365 int brightness = bl->props.brightness; 366 367 if (bl->props.power != FB_BLANK_UNBLANK) 368 brightness = 0; 369 370 if (bl->props.fb_blank != FB_BLANK_UNBLANK) 371 brightness = 0; 372 373 return adp8860_bl_set(bl, brightness); 374} 375 376static int adp8860_bl_get_brightness(struct backlight_device *bl) 377{ 378 struct adp8860_bl *data = bl_get_data(bl); 379 380 return data->current_brightness; 381} 382 383static const struct backlight_ops adp8860_bl_ops = { 384 .update_status = adp8860_bl_update_status, 385 .get_brightness = adp8860_bl_get_brightness, 386}; 387 388static int adp8860_bl_setup(struct backlight_device *bl) 389{ 390 struct adp8860_bl *data = bl_get_data(bl); 391 struct i2c_client *client = data->client; 392 struct adp8860_backlight_platform_data *pdata = data->pdata; 393 int ret = 0; 394 395 ret |= adp8860_write(client, ADP8860_BLSEN, ~pdata->bl_led_assign); 396 ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max); 397 ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim); 398 399 if (data->en_ambl_sens) { 400 data->cached_daylight_max = pdata->l1_daylight_max; 401 ret |= adp8860_write(client, ADP8860_BLMX2, 402 pdata->l2_office_max); 403 ret |= adp8860_write(client, ADP8860_BLDM2, 404 pdata->l2_office_dim); 405 ret |= adp8860_write(client, ADP8860_BLMX3, 406 pdata->l3_dark_max); 407 ret |= adp8860_write(client, ADP8860_BLDM3, 408 pdata->l3_dark_dim); 409 410 ret |= adp8860_write(client, ADP8860_L2_TRP, pdata->l2_trip); 411 ret |= adp8860_write(client, ADP8860_L2_HYS, pdata->l2_hyst); 412 ret |= adp8860_write(client, ADP8860_L3_TRP, pdata->l3_trip); 413 ret |= adp8860_write(client, ADP8860_L3_HYS, pdata->l3_hyst); 414 ret |= adp8860_write(client, ADP8860_CCFG, L2_EN | L3_EN | 415 ALS_CCFG_VAL(pdata->abml_filt)); 416 } 417 418 ret |= adp8860_write(client, ADP8860_CFGR, 419 BL_CFGR_VAL(pdata->bl_fade_law, 0)); 420 421 ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in, 422 pdata->bl_fade_out)); 423 424 ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY | 425 (data->gdwn_dis ? GDWN_DIS : 0)); 426 427 return ret; 428} 429 430static ssize_t adp8860_show(struct device *dev, char *buf, int reg) 431{ 432 struct adp8860_bl *data = dev_get_drvdata(dev); 433 int error; 434 uint8_t reg_val; 435 436 mutex_lock(&data->lock); 437 error = adp8860_read(data->client, reg, ®_val); 438 mutex_unlock(&data->lock); 439 440 if (error < 0) 441 return error; 442 443 return sprintf(buf, "%u\n", reg_val); 444} 445 446static ssize_t adp8860_store(struct device *dev, const char *buf, 447 size_t count, int reg) 448{ 449 struct adp8860_bl *data = dev_get_drvdata(dev); 450 unsigned long val; 451 int ret; 452 453 ret = kstrtoul(buf, 10, &val); 454 if (ret) 455 return ret; 456 457 mutex_lock(&data->lock); 458 adp8860_write(data->client, reg, val); 459 mutex_unlock(&data->lock); 460 461 return count; 462} 463 464static ssize_t adp8860_bl_l3_dark_max_show(struct device *dev, 465 struct device_attribute *attr, char *buf) 466{ 467 return adp8860_show(dev, buf, ADP8860_BLMX3); 468} 469 470static ssize_t adp8860_bl_l3_dark_max_store(struct device *dev, 471 struct device_attribute *attr, const char *buf, size_t count) 472{ 473 return adp8860_store(dev, buf, count, ADP8860_BLMX3); 474} 475 476static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show, 477 adp8860_bl_l3_dark_max_store); 478 479static ssize_t adp8860_bl_l2_office_max_show(struct device *dev, 480 struct device_attribute *attr, char *buf) 481{ 482 return adp8860_show(dev, buf, ADP8860_BLMX2); 483} 484 485static ssize_t adp8860_bl_l2_office_max_store(struct device *dev, 486 struct device_attribute *attr, const char *buf, size_t count) 487{ 488 return adp8860_store(dev, buf, count, ADP8860_BLMX2); 489} 490static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show, 491 adp8860_bl_l2_office_max_store); 492 493static ssize_t adp8860_bl_l1_daylight_max_show(struct device *dev, 494 struct device_attribute *attr, char *buf) 495{ 496 return adp8860_show(dev, buf, ADP8860_BLMX1); 497} 498 499static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev, 500 struct device_attribute *attr, const char *buf, size_t count) 501{ 502 struct adp8860_bl *data = dev_get_drvdata(dev); 503 int ret = kstrtoul(buf, 10, &data->cached_daylight_max); 504 505 if (ret) 506 return ret; 507 508 return adp8860_store(dev, buf, count, ADP8860_BLMX1); 509} 510static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show, 511 adp8860_bl_l1_daylight_max_store); 512 513static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev, 514 struct device_attribute *attr, char *buf) 515{ 516 return adp8860_show(dev, buf, ADP8860_BLDM3); 517} 518 519static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev, 520 struct device_attribute *attr, 521 const char *buf, size_t count) 522{ 523 return adp8860_store(dev, buf, count, ADP8860_BLDM3); 524} 525static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show, 526 adp8860_bl_l3_dark_dim_store); 527 528static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev, 529 struct device_attribute *attr, char *buf) 530{ 531 return adp8860_show(dev, buf, ADP8860_BLDM2); 532} 533 534static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev, 535 struct device_attribute *attr, 536 const char *buf, size_t count) 537{ 538 return adp8860_store(dev, buf, count, ADP8860_BLDM2); 539} 540static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show, 541 adp8860_bl_l2_office_dim_store); 542 543static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev, 544 struct device_attribute *attr, char *buf) 545{ 546 return adp8860_show(dev, buf, ADP8860_BLDM1); 547} 548 549static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev, 550 struct device_attribute *attr, 551 const char *buf, size_t count) 552{ 553 return adp8860_store(dev, buf, count, ADP8860_BLDM1); 554} 555static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show, 556 adp8860_bl_l1_daylight_dim_store); 557 558#ifdef ADP8860_EXT_FEATURES 559static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev, 560 struct device_attribute *attr, char *buf) 561{ 562 struct adp8860_bl *data = dev_get_drvdata(dev); 563 int error; 564 uint8_t reg_val; 565 uint16_t ret_val; 566 567 mutex_lock(&data->lock); 568 error = adp8860_read(data->client, ADP8860_PH1LEVL, ®_val); 569 ret_val = reg_val; 570 error |= adp8860_read(data->client, ADP8860_PH1LEVH, ®_val); 571 mutex_unlock(&data->lock); 572 573 if (error < 0) 574 return error; 575 576 /* Return 13-bit conversion value for the first light sensor */ 577 ret_val += (reg_val & 0x1F) << 8; 578 579 return sprintf(buf, "%u\n", ret_val); 580} 581static DEVICE_ATTR(ambient_light_level, 0444, 582 adp8860_bl_ambient_light_level_show, NULL); 583 584static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev, 585 struct device_attribute *attr, char *buf) 586{ 587 struct adp8860_bl *data = dev_get_drvdata(dev); 588 int error; 589 uint8_t reg_val; 590 591 mutex_lock(&data->lock); 592 error = adp8860_read(data->client, ADP8860_CFGR, ®_val); 593 mutex_unlock(&data->lock); 594 595 if (error < 0) 596 return error; 597 598 return sprintf(buf, "%u\n", 599 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1); 600} 601 602static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev, 603 struct device_attribute *attr, 604 const char *buf, size_t count) 605{ 606 struct adp8860_bl *data = dev_get_drvdata(dev); 607 unsigned long val; 608 uint8_t reg_val; 609 int ret; 610 611 ret = kstrtoul(buf, 10, &val); 612 if (ret) 613 return ret; 614 615 if (val == 0) { 616 /* Enable automatic ambient light sensing */ 617 adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 618 } else if ((val > 0) && (val <= 3)) { 619 /* Disable automatic ambient light sensing */ 620 adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 621 622 /* Set user supplied ambient light zone */ 623 mutex_lock(&data->lock); 624 adp8860_read(data->client, ADP8860_CFGR, ®_val); 625 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 626 reg_val |= (val - 1) << CFGR_BLV_SHIFT; 627 adp8860_write(data->client, ADP8860_CFGR, reg_val); 628 mutex_unlock(&data->lock); 629 } 630 631 return count; 632} 633static DEVICE_ATTR(ambient_light_zone, 0664, 634 adp8860_bl_ambient_light_zone_show, 635 adp8860_bl_ambient_light_zone_store); 636#endif 637 638static struct attribute *adp8860_bl_attributes[] = { 639 &dev_attr_l3_dark_max.attr, 640 &dev_attr_l3_dark_dim.attr, 641 &dev_attr_l2_office_max.attr, 642 &dev_attr_l2_office_dim.attr, 643 &dev_attr_l1_daylight_max.attr, 644 &dev_attr_l1_daylight_dim.attr, 645#ifdef ADP8860_EXT_FEATURES 646 &dev_attr_ambient_light_level.attr, 647 &dev_attr_ambient_light_zone.attr, 648#endif 649 NULL 650}; 651 652static const struct attribute_group adp8860_bl_attr_group = { 653 .attrs = adp8860_bl_attributes, 654}; 655 656static int adp8860_probe(struct i2c_client *client, 657 const struct i2c_device_id *id) 658{ 659 struct backlight_device *bl; 660 struct adp8860_bl *data; 661 struct adp8860_backlight_platform_data *pdata = 662 dev_get_platdata(&client->dev); 663 struct backlight_properties props; 664 uint8_t reg_val; 665 int ret; 666 667 if (!i2c_check_functionality(client->adapter, 668 I2C_FUNC_SMBUS_BYTE_DATA)) { 669 dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); 670 return -EIO; 671 } 672 673 if (!pdata) { 674 dev_err(&client->dev, "no platform data?\n"); 675 return -EINVAL; 676 } 677 678 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 679 if (data == NULL) 680 return -ENOMEM; 681 682 ret = adp8860_read(client, ADP8860_MFDVID, ®_val); 683 if (ret < 0) 684 return ret; 685 686 switch (ADP8860_MANID(reg_val)) { 687 case ADP8863_MANUFID: 688 data->gdwn_dis = !!pdata->gdwn_dis; 689 case ADP8860_MANUFID: 690 data->en_ambl_sens = !!pdata->en_ambl_sens; 691 break; 692 case ADP8861_MANUFID: 693 data->gdwn_dis = !!pdata->gdwn_dis; 694 break; 695 default: 696 dev_err(&client->dev, "failed to probe\n"); 697 return -ENODEV; 698 } 699 700 /* It's confirmed that the DEVID field is actually a REVID */ 701 702 data->revid = ADP8860_DEVID(reg_val); 703 data->client = client; 704 data->pdata = pdata; 705 data->id = id->driver_data; 706 data->current_brightness = 0; 707 i2c_set_clientdata(client, data); 708 709 memset(&props, 0, sizeof(props)); 710 props.type = BACKLIGHT_RAW; 711 props.max_brightness = ADP8860_MAX_BRIGHTNESS; 712 713 mutex_init(&data->lock); 714 715 bl = devm_backlight_device_register(&client->dev, 716 dev_driver_string(&client->dev), 717 &client->dev, data, &adp8860_bl_ops, &props); 718 if (IS_ERR(bl)) { 719 dev_err(&client->dev, "failed to register backlight\n"); 720 return PTR_ERR(bl); 721 } 722 723 bl->props.brightness = ADP8860_MAX_BRIGHTNESS; 724 725 data->bl = bl; 726 727 if (data->en_ambl_sens) 728 ret = sysfs_create_group(&bl->dev.kobj, 729 &adp8860_bl_attr_group); 730 731 if (ret) { 732 dev_err(&client->dev, "failed to register sysfs\n"); 733 return ret; 734 } 735 736 ret = adp8860_bl_setup(bl); 737 if (ret) { 738 ret = -EIO; 739 goto out; 740 } 741 742 backlight_update_status(bl); 743 744 dev_info(&client->dev, "%s Rev.%d Backlight\n", 745 client->name, data->revid); 746 747 if (pdata->num_leds) 748 adp8860_led_probe(client); 749 750 return 0; 751 752out: 753 if (data->en_ambl_sens) 754 sysfs_remove_group(&data->bl->dev.kobj, 755 &adp8860_bl_attr_group); 756 757 return ret; 758} 759 760static int adp8860_remove(struct i2c_client *client) 761{ 762 struct adp8860_bl *data = i2c_get_clientdata(client); 763 764 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 765 766 if (data->led) 767 adp8860_led_remove(client); 768 769 if (data->en_ambl_sens) 770 sysfs_remove_group(&data->bl->dev.kobj, 771 &adp8860_bl_attr_group); 772 773 return 0; 774} 775 776#ifdef CONFIG_PM_SLEEP 777static int adp8860_i2c_suspend(struct device *dev) 778{ 779 struct i2c_client *client = to_i2c_client(dev); 780 781 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 782 783 return 0; 784} 785 786static int adp8860_i2c_resume(struct device *dev) 787{ 788 struct i2c_client *client = to_i2c_client(dev); 789 790 adp8860_set_bits(client, ADP8860_MDCR, NSTBY | BLEN); 791 792 return 0; 793} 794#endif 795 796static SIMPLE_DEV_PM_OPS(adp8860_i2c_pm_ops, adp8860_i2c_suspend, 797 adp8860_i2c_resume); 798 799static const struct i2c_device_id adp8860_id[] = { 800 { "adp8860", adp8860 }, 801 { "adp8861", adp8861 }, 802 { "adp8863", adp8863 }, 803 { } 804}; 805MODULE_DEVICE_TABLE(i2c, adp8860_id); 806 807static struct i2c_driver adp8860_driver = { 808 .driver = { 809 .name = KBUILD_MODNAME, 810 .pm = &adp8860_i2c_pm_ops, 811 }, 812 .probe = adp8860_probe, 813 .remove = adp8860_remove, 814 .id_table = adp8860_id, 815}; 816 817module_i2c_driver(adp8860_driver); 818 819MODULE_LICENSE("GPL v2"); 820MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 821MODULE_DESCRIPTION("ADP8860 Backlight driver"); 822MODULE_ALIAS("i2c:adp8860-backlight"); 823