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 91 enum { 92 adp8860, 93 adp8861, 94 adp8863 95 }; 96 97 struct 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 }; 105 106 struct 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 }; 119 120 static 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 } 133 134 static int adp8860_write(struct i2c_client *client, u8 reg, u8 val) 135 { 136 return i2c_smbus_write_byte_data(client, reg, val); 137 } 138 139 static 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 } 157 158 static 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) 181 static 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 } 187 188 static 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 } 197 198 static 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 } 215 216 static int adp8860_led_probe(struct i2c_client *client) 217 { 218 struct adp8860_backlight_platform_data *pdata = 219 dev_get_platdata(&client->dev); 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; 224 225 led = devm_kzalloc(&client->dev, sizeof(*led) * pdata->num_leds, 226 GFP_KERNEL); 227 if (led == NULL) 228 return -ENOMEM; 229 230 ret = adp8860_write(client, ADP8860_ISCFR, pdata->led_fade_law); 231 ret = adp8860_write(client, ADP8860_ISCT1, 232 (pdata->led_on_time & 0x3) << 6); 233 ret |= adp8860_write(client, ADP8860_ISCF, 234 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out)); 235 236 if (ret) { 237 dev_err(&client->dev, "failed to write\n"); 238 return ret; 239 } 240 241 for (i = 0; i < pdata->num_leds; ++i) { 242 cur_led = &pdata->leds[i]; 243 led_dat = &led[i]; 244 245 led_dat->id = cur_led->flags & ADP8860_FLAG_LED_MASK; 246 247 if (led_dat->id > 7 || led_dat->id < 1) { 248 dev_err(&client->dev, "Invalid LED ID %d\n", 249 led_dat->id); 250 ret = -EINVAL; 251 goto err; 252 } 253 254 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) { 255 dev_err(&client->dev, "LED %d used by Backlight\n", 256 led_dat->id); 257 ret = -EBUSY; 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 } 294 295 return ret; 296 } 297 298 static int adp8860_led_remove(struct i2c_client *client) 299 { 300 struct adp8860_backlight_platform_data *pdata = 301 dev_get_platdata(&client->dev); 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 } 309 310 return 0; 311 } 312 #else 313 static int adp8860_led_probe(struct i2c_client *client) 314 { 315 return 0; 316 } 317 318 static int adp8860_led_remove(struct i2c_client *client) 319 { 320 return 0; 321 } 322 #endif 323 324 static 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; 329 330 if (data->en_ambl_sens) { 331 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 } 361 362 static 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 } 373 374 static 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 } 380 381 static const struct backlight_ops adp8860_bl_ops = { 382 .update_status = adp8860_bl_update_status, 383 .get_brightness = adp8860_bl_get_brightness, 384 }; 385 386 static 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); 396 397 if (data->en_ambl_sens) { 398 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)); 421 422 ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY | 423 (data->gdwn_dis ? GDWN_DIS : 0)); 424 425 return ret; 426 } 427 428 static 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, ®_val); 436 mutex_unlock(&data->lock); 437 438 if (error < 0) 439 return error; 440 441 return sprintf(buf, "%u\n", reg_val); 442 } 443 444 static 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; 450 451 ret = kstrtoul(buf, 10, &val); 452 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 } 461 462 static 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 } 467 468 static 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 } 473 474 static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show, 475 adp8860_bl_l3_dark_max_store); 476 477 static 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 } 482 483 static 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 } 488 static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show, 489 adp8860_bl_l2_office_max_store); 490 491 static 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 } 496 497 static 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); 501 int ret = kstrtoul(buf, 10, &data->cached_daylight_max); 502 if (ret) 503 return ret; 504 505 return adp8860_store(dev, buf, count, ADP8860_BLMX1); 506 } 507 static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show, 508 adp8860_bl_l1_daylight_max_store); 509 510 static 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 } 515 516 static 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 } 522 static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show, 523 adp8860_bl_l3_dark_dim_store); 524 525 static 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 } 530 531 static 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 } 537 static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show, 538 adp8860_bl_l2_office_dim_store); 539 540 static 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 } 545 546 static 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 } 552 static 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 556 static 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, ®_val); 566 ret_val = reg_val; 567 error |= adp8860_read(data->client, ADP8860_PH1LEVH, ®_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 } 578 static DEVICE_ATTR(ambient_light_level, 0444, 579 adp8860_bl_ambient_light_level_show, NULL); 580 581 static 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, ®_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 } 598 599 static 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; 607 608 ret = kstrtoul(buf, 10, &val); 609 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); 615 } else if ((val > 0) && (val <= 3)) { 616 /* 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, ®_val); 622 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 623 reg_val |= (val - 1) << CFGR_BLV_SHIFT; 624 adp8860_write(data->client, ADP8860_CFGR, reg_val); 625 mutex_unlock(&data->lock); 626 } 627 628 return count; 629 } 630 static DEVICE_ATTR(ambient_light_zone, 0664, 631 adp8860_bl_ambient_light_zone_show, 632 adp8860_bl_ambient_light_zone_store); 633 #endif 634 635 static 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 }; 648 649 static const struct attribute_group adp8860_bl_attr_group = { 650 .attrs = adp8860_bl_attributes, 651 }; 652 653 static int 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 dev_get_platdata(&client->dev); 660 struct backlight_properties props; 661 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 } 674 675 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 676 if (data == NULL) 677 return -ENOMEM; 678 679 ret = adp8860_read(client, ADP8860_MFDVID, ®_val); 680 if (ret < 0) 681 return ret; 682 683 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"); 694 return -ENODEV; 695 } 696 697 /* 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); 705 706 memset(&props, 0, sizeof(props)); 707 props.type = BACKLIGHT_RAW; 708 props.max_brightness = ADP8860_MAX_BRIGHTNESS; 709 710 mutex_init(&data->lock); 711 712 bl = devm_backlight_device_register(&client->dev, 713 dev_driver_string(&client->dev), 714 &client->dev, data, &adp8860_bl_ops, &props); 715 if (IS_ERR(bl)) { 716 dev_err(&client->dev, "failed to register backlight\n"); 717 return PTR_ERR(bl); 718 } 719 720 bl->props.brightness = ADP8860_MAX_BRIGHTNESS; 721 722 data->bl = bl; 723 724 if (data->en_ambl_sens) 725 ret = sysfs_create_group(&bl->dev.kobj, 726 &adp8860_bl_attr_group); 727 728 if (ret) { 729 dev_err(&client->dev, "failed to register sysfs\n"); 730 return ret; 731 } 732 733 ret = adp8860_bl_setup(bl); 734 if (ret) { 735 ret = -EIO; 736 goto out; 737 } 738 739 backlight_update_status(bl); 740 741 dev_info(&client->dev, "%s Rev.%d Backlight\n", 742 client->name, data->revid); 743 744 if (pdata->num_leds) 745 adp8860_led_probe(client); 746 747 return 0; 748 749 out: 750 if (data->en_ambl_sens) 751 sysfs_remove_group(&data->bl->dev.kobj, 752 &adp8860_bl_attr_group); 753 754 return ret; 755 } 756 757 static int adp8860_remove(struct i2c_client *client) 758 { 759 struct adp8860_bl *data = i2c_get_clientdata(client); 760 761 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 762 763 if (data->led) 764 adp8860_led_remove(client); 765 766 if (data->en_ambl_sens) 767 sysfs_remove_group(&data->bl->dev.kobj, 768 &adp8860_bl_attr_group); 769 770 return 0; 771 } 772 773 #ifdef CONFIG_PM_SLEEP 774 static int adp8860_i2c_suspend(struct device *dev) 775 { 776 struct i2c_client *client = to_i2c_client(dev); 777 778 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 779 780 return 0; 781 } 782 783 static int adp8860_i2c_resume(struct device *dev) 784 { 785 struct i2c_client *client = to_i2c_client(dev); 786 787 adp8860_set_bits(client, ADP8860_MDCR, NSTBY | BLEN); 788 789 return 0; 790 } 791 #endif 792 793 static SIMPLE_DEV_PM_OPS(adp8860_i2c_pm_ops, adp8860_i2c_suspend, 794 adp8860_i2c_resume); 795 796 static const struct i2c_device_id adp8860_id[] = { 797 { "adp8860", adp8860 }, 798 { "adp8861", adp8861 }, 799 { "adp8863", adp8863 }, 800 { } 801 }; 802 MODULE_DEVICE_TABLE(i2c, adp8860_id); 803 804 static struct i2c_driver adp8860_driver = { 805 .driver = { 806 .name = KBUILD_MODNAME, 807 .pm = &adp8860_i2c_pm_ops, 808 }, 809 .probe = adp8860_probe, 810 .remove = adp8860_remove, 811 .id_table = adp8860_id, 812 }; 813 814 module_i2c_driver(adp8860_driver); 815 816 MODULE_LICENSE("GPL v2"); 817 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 818 MODULE_DESCRIPTION("ADP8860 Backlight driver"); 819 MODULE_ALIAS("i2c:adp8860-backlight"); 820