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 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"); 240 return ret; 241 } 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 ret = -EINVAL; 253 goto err; 254 } 255 256 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) { 257 dev_err(&client->dev, "LED %d used by Backlight\n", 258 led_dat->id); 259 ret = -EBUSY; 260 goto err; 261 } 262 263 led_dat->cdev.name = cur_led->name; 264 led_dat->cdev.default_trigger = cur_led->default_trigger; 265 led_dat->cdev.brightness_set = adp8860_led_set; 266 led_dat->cdev.brightness = LED_OFF; 267 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT; 268 led_dat->client = client; 269 led_dat->new_brightness = LED_OFF; 270 INIT_WORK(&led_dat->work, adp8860_led_work); 271 272 ret = led_classdev_register(&client->dev, &led_dat->cdev); 273 if (ret) { 274 dev_err(&client->dev, "failed to register LED %d\n", 275 led_dat->id); 276 goto err; 277 } 278 279 ret = adp8860_led_setup(led_dat); 280 if (ret) { 281 dev_err(&client->dev, "failed to write\n"); 282 i++; 283 goto err; 284 } 285 } 286 287 data->led = led; 288 289 return 0; 290 291 err: 292 for (i = i - 1; i >= 0; --i) { 293 led_classdev_unregister(&led[i].cdev); 294 cancel_work_sync(&led[i].work); 295 } 296 297 return ret; 298 } 299 300 static int adp8860_led_remove(struct i2c_client *client) 301 { 302 struct adp8860_backlight_platform_data *pdata = 303 dev_get_platdata(&client->dev); 304 struct adp8860_bl *data = i2c_get_clientdata(client); 305 int i; 306 307 for (i = 0; i < pdata->num_leds; i++) { 308 led_classdev_unregister(&data->led[i].cdev); 309 cancel_work_sync(&data->led[i].work); 310 } 311 312 return 0; 313 } 314 #else 315 static int adp8860_led_probe(struct i2c_client *client) 316 { 317 return 0; 318 } 319 320 static int adp8860_led_remove(struct i2c_client *client) 321 { 322 return 0; 323 } 324 #endif 325 326 static int adp8860_bl_set(struct backlight_device *bl, int brightness) 327 { 328 struct adp8860_bl *data = bl_get_data(bl); 329 struct i2c_client *client = data->client; 330 int ret = 0; 331 332 if (data->en_ambl_sens) { 333 if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) { 334 /* Disable Ambient Light auto adjust */ 335 ret |= adp8860_clr_bits(client, ADP8860_MDCR, 336 CMP_AUTOEN); 337 ret |= adp8860_write(client, ADP8860_BLMX1, brightness); 338 } else { 339 /* 340 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust 341 * restore daylight l1 sysfs brightness 342 */ 343 ret |= adp8860_write(client, ADP8860_BLMX1, 344 data->cached_daylight_max); 345 ret |= adp8860_set_bits(client, ADP8860_MDCR, 346 CMP_AUTOEN); 347 } 348 } else 349 ret |= adp8860_write(client, ADP8860_BLMX1, brightness); 350 351 if (data->current_brightness && brightness == 0) 352 ret |= adp8860_set_bits(client, 353 ADP8860_MDCR, DIM_EN); 354 else if (data->current_brightness == 0 && brightness) 355 ret |= adp8860_clr_bits(client, 356 ADP8860_MDCR, DIM_EN); 357 358 if (!ret) 359 data->current_brightness = brightness; 360 361 return ret; 362 } 363 364 static int adp8860_bl_update_status(struct backlight_device *bl) 365 { 366 int brightness = bl->props.brightness; 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 } 375 376 static 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 } 382 383 static const struct backlight_ops adp8860_bl_ops = { 384 .update_status = adp8860_bl_update_status, 385 .get_brightness = adp8860_bl_get_brightness, 386 }; 387 388 static 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 } 429 430 static 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 } 445 446 static 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 } 463 464 static 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 } 469 470 static 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 } 475 476 static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show, 477 adp8860_bl_l3_dark_max_store); 478 479 static 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 } 484 485 static 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 } 490 static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show, 491 adp8860_bl_l2_office_max_store); 492 493 static 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 } 498 499 static 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 if (ret) 505 return ret; 506 507 return adp8860_store(dev, buf, count, ADP8860_BLMX1); 508 } 509 static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show, 510 adp8860_bl_l1_daylight_max_store); 511 512 static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev, 513 struct device_attribute *attr, char *buf) 514 { 515 return adp8860_show(dev, buf, ADP8860_BLDM3); 516 } 517 518 static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev, 519 struct device_attribute *attr, 520 const char *buf, size_t count) 521 { 522 return adp8860_store(dev, buf, count, ADP8860_BLDM3); 523 } 524 static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show, 525 adp8860_bl_l3_dark_dim_store); 526 527 static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev, 528 struct device_attribute *attr, char *buf) 529 { 530 return adp8860_show(dev, buf, ADP8860_BLDM2); 531 } 532 533 static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev, 534 struct device_attribute *attr, 535 const char *buf, size_t count) 536 { 537 return adp8860_store(dev, buf, count, ADP8860_BLDM2); 538 } 539 static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show, 540 adp8860_bl_l2_office_dim_store); 541 542 static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev, 543 struct device_attribute *attr, char *buf) 544 { 545 return adp8860_show(dev, buf, ADP8860_BLDM1); 546 } 547 548 static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev, 549 struct device_attribute *attr, 550 const char *buf, size_t count) 551 { 552 return adp8860_store(dev, buf, count, ADP8860_BLDM1); 553 } 554 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show, 555 adp8860_bl_l1_daylight_dim_store); 556 557 #ifdef ADP8860_EXT_FEATURES 558 static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev, 559 struct device_attribute *attr, char *buf) 560 { 561 struct adp8860_bl *data = dev_get_drvdata(dev); 562 int error; 563 uint8_t reg_val; 564 uint16_t ret_val; 565 566 mutex_lock(&data->lock); 567 error = adp8860_read(data->client, ADP8860_PH1LEVL, ®_val); 568 ret_val = reg_val; 569 error |= adp8860_read(data->client, ADP8860_PH1LEVH, ®_val); 570 mutex_unlock(&data->lock); 571 572 if (error < 0) 573 return error; 574 575 /* Return 13-bit conversion value for the first light sensor */ 576 ret_val += (reg_val & 0x1F) << 8; 577 578 return sprintf(buf, "%u\n", ret_val); 579 } 580 static DEVICE_ATTR(ambient_light_level, 0444, 581 adp8860_bl_ambient_light_level_show, NULL); 582 583 static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev, 584 struct device_attribute *attr, char *buf) 585 { 586 struct adp8860_bl *data = dev_get_drvdata(dev); 587 int error; 588 uint8_t reg_val; 589 590 mutex_lock(&data->lock); 591 error = adp8860_read(data->client, ADP8860_CFGR, ®_val); 592 mutex_unlock(&data->lock); 593 594 if (error < 0) 595 return error; 596 597 return sprintf(buf, "%u\n", 598 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1); 599 } 600 601 static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev, 602 struct device_attribute *attr, 603 const char *buf, size_t count) 604 { 605 struct adp8860_bl *data = dev_get_drvdata(dev); 606 unsigned long val; 607 uint8_t reg_val; 608 int ret; 609 610 ret = kstrtoul(buf, 10, &val); 611 if (ret) 612 return ret; 613 614 if (val == 0) { 615 /* Enable automatic ambient light sensing */ 616 adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 617 } else if ((val > 0) && (val <= 3)) { 618 /* Disable automatic ambient light sensing */ 619 adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 620 621 /* Set user supplied ambient light zone */ 622 mutex_lock(&data->lock); 623 adp8860_read(data->client, ADP8860_CFGR, ®_val); 624 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 625 reg_val |= (val - 1) << CFGR_BLV_SHIFT; 626 adp8860_write(data->client, ADP8860_CFGR, reg_val); 627 mutex_unlock(&data->lock); 628 } 629 630 return count; 631 } 632 static DEVICE_ATTR(ambient_light_zone, 0664, 633 adp8860_bl_ambient_light_zone_show, 634 adp8860_bl_ambient_light_zone_store); 635 #endif 636 637 static struct attribute *adp8860_bl_attributes[] = { 638 &dev_attr_l3_dark_max.attr, 639 &dev_attr_l3_dark_dim.attr, 640 &dev_attr_l2_office_max.attr, 641 &dev_attr_l2_office_dim.attr, 642 &dev_attr_l1_daylight_max.attr, 643 &dev_attr_l1_daylight_dim.attr, 644 #ifdef ADP8860_EXT_FEATURES 645 &dev_attr_ambient_light_level.attr, 646 &dev_attr_ambient_light_zone.attr, 647 #endif 648 NULL 649 }; 650 651 static const struct attribute_group adp8860_bl_attr_group = { 652 .attrs = adp8860_bl_attributes, 653 }; 654 655 static int adp8860_probe(struct i2c_client *client, 656 const struct i2c_device_id *id) 657 { 658 struct backlight_device *bl; 659 struct adp8860_bl *data; 660 struct adp8860_backlight_platform_data *pdata = 661 dev_get_platdata(&client->dev); 662 struct backlight_properties props; 663 uint8_t reg_val; 664 int ret; 665 666 if (!i2c_check_functionality(client->adapter, 667 I2C_FUNC_SMBUS_BYTE_DATA)) { 668 dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); 669 return -EIO; 670 } 671 672 if (!pdata) { 673 dev_err(&client->dev, "no platform data?\n"); 674 return -EINVAL; 675 } 676 677 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 678 if (data == NULL) 679 return -ENOMEM; 680 681 ret = adp8860_read(client, ADP8860_MFDVID, ®_val); 682 if (ret < 0) 683 return ret; 684 685 switch (ADP8860_MANID(reg_val)) { 686 case ADP8863_MANUFID: 687 data->gdwn_dis = !!pdata->gdwn_dis; 688 case ADP8860_MANUFID: 689 data->en_ambl_sens = !!pdata->en_ambl_sens; 690 break; 691 case ADP8861_MANUFID: 692 data->gdwn_dis = !!pdata->gdwn_dis; 693 break; 694 default: 695 dev_err(&client->dev, "failed to probe\n"); 696 return -ENODEV; 697 } 698 699 /* It's confirmed that the DEVID field is actually a REVID */ 700 701 data->revid = ADP8860_DEVID(reg_val); 702 data->client = client; 703 data->pdata = pdata; 704 data->id = id->driver_data; 705 data->current_brightness = 0; 706 i2c_set_clientdata(client, data); 707 708 memset(&props, 0, sizeof(props)); 709 props.type = BACKLIGHT_RAW; 710 props.max_brightness = ADP8860_MAX_BRIGHTNESS; 711 712 mutex_init(&data->lock); 713 714 bl = devm_backlight_device_register(&client->dev, 715 dev_driver_string(&client->dev), 716 &client->dev, data, &adp8860_bl_ops, &props); 717 if (IS_ERR(bl)) { 718 dev_err(&client->dev, "failed to register backlight\n"); 719 return PTR_ERR(bl); 720 } 721 722 bl->props.brightness = ADP8860_MAX_BRIGHTNESS; 723 724 data->bl = bl; 725 726 if (data->en_ambl_sens) 727 ret = sysfs_create_group(&bl->dev.kobj, 728 &adp8860_bl_attr_group); 729 730 if (ret) { 731 dev_err(&client->dev, "failed to register sysfs\n"); 732 return ret; 733 } 734 735 ret = adp8860_bl_setup(bl); 736 if (ret) { 737 ret = -EIO; 738 goto out; 739 } 740 741 backlight_update_status(bl); 742 743 dev_info(&client->dev, "%s Rev.%d Backlight\n", 744 client->name, data->revid); 745 746 if (pdata->num_leds) 747 adp8860_led_probe(client); 748 749 return 0; 750 751 out: 752 if (data->en_ambl_sens) 753 sysfs_remove_group(&data->bl->dev.kobj, 754 &adp8860_bl_attr_group); 755 756 return ret; 757 } 758 759 static int adp8860_remove(struct i2c_client *client) 760 { 761 struct adp8860_bl *data = i2c_get_clientdata(client); 762 763 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 764 765 if (data->led) 766 adp8860_led_remove(client); 767 768 if (data->en_ambl_sens) 769 sysfs_remove_group(&data->bl->dev.kobj, 770 &adp8860_bl_attr_group); 771 772 return 0; 773 } 774 775 #ifdef CONFIG_PM_SLEEP 776 static int adp8860_i2c_suspend(struct device *dev) 777 { 778 struct i2c_client *client = to_i2c_client(dev); 779 780 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 781 782 return 0; 783 } 784 785 static int adp8860_i2c_resume(struct device *dev) 786 { 787 struct i2c_client *client = to_i2c_client(dev); 788 789 adp8860_set_bits(client, ADP8860_MDCR, NSTBY | BLEN); 790 791 return 0; 792 } 793 #endif 794 795 static SIMPLE_DEV_PM_OPS(adp8860_i2c_pm_ops, adp8860_i2c_suspend, 796 adp8860_i2c_resume); 797 798 static const struct i2c_device_id adp8860_id[] = { 799 { "adp8860", adp8860 }, 800 { "adp8861", adp8861 }, 801 { "adp8863", adp8863 }, 802 { } 803 }; 804 MODULE_DEVICE_TABLE(i2c, adp8860_id); 805 806 static struct i2c_driver adp8860_driver = { 807 .driver = { 808 .name = KBUILD_MODNAME, 809 .pm = &adp8860_i2c_pm_ops, 810 }, 811 .probe = adp8860_probe, 812 .remove = adp8860_remove, 813 .id_table = adp8860_id, 814 }; 815 816 module_i2c_driver(adp8860_driver); 817 818 MODULE_LICENSE("GPL v2"); 819 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 820 MODULE_DESCRIPTION("ADP8860 Backlight driver"); 821 MODULE_ALIAS("i2c:adp8860-backlight"); 822