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/platform_data/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); 184 185 adp8860_write(led->client, ADP8860_ISC1 - led->id + 1, 186 led->new_brightness >> 1); 187 } 188 189 static 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 } 198 199 static 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 } 216 217 static 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_kcalloc(&client->dev, pdata->num_leds, sizeof(*led), 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 } 298 299 static 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 314 static int adp8860_led_probe(struct i2c_client *client) 315 { 316 return 0; 317 } 318 319 static int adp8860_led_remove(struct i2c_client *client) 320 { 321 return 0; 322 } 323 #endif 324 325 static 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 } 362 363 static 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 } 375 376 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); 504 505 if (ret) 506 return ret; 507 508 return adp8860_store(dev, buf, count, ADP8860_BLMX1); 509 } 510 static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show, 511 adp8860_bl_l1_daylight_max_store); 512 513 static 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 } 518 519 static 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 } 525 static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show, 526 adp8860_bl_l3_dark_dim_store); 527 528 static 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 } 533 534 static 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 } 540 static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show, 541 adp8860_bl_l2_office_dim_store); 542 543 static 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 } 548 549 static 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 } 555 static 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 559 static 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 if (!error) { 570 ret_val = reg_val; 571 error = adp8860_read(data->client, ADP8860_PH1LEVH, ®_val); 572 } 573 mutex_unlock(&data->lock); 574 575 if (error) 576 return error; 577 578 /* Return 13-bit conversion value for the first light sensor */ 579 ret_val += (reg_val & 0x1F) << 8; 580 581 return sprintf(buf, "%u\n", ret_val); 582 } 583 static DEVICE_ATTR(ambient_light_level, 0444, 584 adp8860_bl_ambient_light_level_show, NULL); 585 586 static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev, 587 struct device_attribute *attr, char *buf) 588 { 589 struct adp8860_bl *data = dev_get_drvdata(dev); 590 int error; 591 uint8_t reg_val; 592 593 mutex_lock(&data->lock); 594 error = adp8860_read(data->client, ADP8860_CFGR, ®_val); 595 mutex_unlock(&data->lock); 596 597 if (error < 0) 598 return error; 599 600 return sprintf(buf, "%u\n", 601 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1); 602 } 603 604 static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev, 605 struct device_attribute *attr, 606 const char *buf, size_t count) 607 { 608 struct adp8860_bl *data = dev_get_drvdata(dev); 609 unsigned long val; 610 uint8_t reg_val; 611 int ret; 612 613 ret = kstrtoul(buf, 10, &val); 614 if (ret) 615 return ret; 616 617 if (val == 0) { 618 /* Enable automatic ambient light sensing */ 619 adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 620 } else if ((val > 0) && (val <= 3)) { 621 /* Disable automatic ambient light sensing */ 622 adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 623 624 /* Set user supplied ambient light zone */ 625 mutex_lock(&data->lock); 626 ret = adp8860_read(data->client, ADP8860_CFGR, ®_val); 627 if (!ret) { 628 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 629 reg_val |= (val - 1) << CFGR_BLV_SHIFT; 630 adp8860_write(data->client, ADP8860_CFGR, reg_val); 631 } 632 mutex_unlock(&data->lock); 633 } 634 635 return count; 636 } 637 static DEVICE_ATTR(ambient_light_zone, 0664, 638 adp8860_bl_ambient_light_zone_show, 639 adp8860_bl_ambient_light_zone_store); 640 #endif 641 642 static struct attribute *adp8860_bl_attributes[] = { 643 &dev_attr_l3_dark_max.attr, 644 &dev_attr_l3_dark_dim.attr, 645 &dev_attr_l2_office_max.attr, 646 &dev_attr_l2_office_dim.attr, 647 &dev_attr_l1_daylight_max.attr, 648 &dev_attr_l1_daylight_dim.attr, 649 #ifdef ADP8860_EXT_FEATURES 650 &dev_attr_ambient_light_level.attr, 651 &dev_attr_ambient_light_zone.attr, 652 #endif 653 NULL 654 }; 655 656 static const struct attribute_group adp8860_bl_attr_group = { 657 .attrs = adp8860_bl_attributes, 658 }; 659 660 static int adp8860_probe(struct i2c_client *client, 661 const struct i2c_device_id *id) 662 { 663 struct backlight_device *bl; 664 struct adp8860_bl *data; 665 struct adp8860_backlight_platform_data *pdata = 666 dev_get_platdata(&client->dev); 667 struct backlight_properties props; 668 uint8_t reg_val; 669 int ret; 670 671 if (!i2c_check_functionality(client->adapter, 672 I2C_FUNC_SMBUS_BYTE_DATA)) { 673 dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); 674 return -EIO; 675 } 676 677 if (!pdata) { 678 dev_err(&client->dev, "no platform data?\n"); 679 return -EINVAL; 680 } 681 682 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 683 if (data == NULL) 684 return -ENOMEM; 685 686 ret = adp8860_read(client, ADP8860_MFDVID, ®_val); 687 if (ret < 0) 688 return ret; 689 690 switch (ADP8860_MANID(reg_val)) { 691 case ADP8863_MANUFID: 692 data->gdwn_dis = !!pdata->gdwn_dis; 693 /* fall through */ 694 case ADP8860_MANUFID: 695 data->en_ambl_sens = !!pdata->en_ambl_sens; 696 break; 697 case ADP8861_MANUFID: 698 data->gdwn_dis = !!pdata->gdwn_dis; 699 break; 700 default: 701 dev_err(&client->dev, "failed to probe\n"); 702 return -ENODEV; 703 } 704 705 /* It's confirmed that the DEVID field is actually a REVID */ 706 707 data->revid = ADP8860_DEVID(reg_val); 708 data->client = client; 709 data->pdata = pdata; 710 data->id = id->driver_data; 711 data->current_brightness = 0; 712 i2c_set_clientdata(client, data); 713 714 memset(&props, 0, sizeof(props)); 715 props.type = BACKLIGHT_RAW; 716 props.max_brightness = ADP8860_MAX_BRIGHTNESS; 717 718 mutex_init(&data->lock); 719 720 bl = devm_backlight_device_register(&client->dev, 721 dev_driver_string(&client->dev), 722 &client->dev, data, &adp8860_bl_ops, &props); 723 if (IS_ERR(bl)) { 724 dev_err(&client->dev, "failed to register backlight\n"); 725 return PTR_ERR(bl); 726 } 727 728 bl->props.brightness = ADP8860_MAX_BRIGHTNESS; 729 730 data->bl = bl; 731 732 if (data->en_ambl_sens) 733 ret = sysfs_create_group(&bl->dev.kobj, 734 &adp8860_bl_attr_group); 735 736 if (ret) { 737 dev_err(&client->dev, "failed to register sysfs\n"); 738 return ret; 739 } 740 741 ret = adp8860_bl_setup(bl); 742 if (ret) { 743 ret = -EIO; 744 goto out; 745 } 746 747 backlight_update_status(bl); 748 749 dev_info(&client->dev, "%s Rev.%d Backlight\n", 750 client->name, data->revid); 751 752 if (pdata->num_leds) 753 adp8860_led_probe(client); 754 755 return 0; 756 757 out: 758 if (data->en_ambl_sens) 759 sysfs_remove_group(&data->bl->dev.kobj, 760 &adp8860_bl_attr_group); 761 762 return ret; 763 } 764 765 static int adp8860_remove(struct i2c_client *client) 766 { 767 struct adp8860_bl *data = i2c_get_clientdata(client); 768 769 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 770 771 if (data->led) 772 adp8860_led_remove(client); 773 774 if (data->en_ambl_sens) 775 sysfs_remove_group(&data->bl->dev.kobj, 776 &adp8860_bl_attr_group); 777 778 return 0; 779 } 780 781 #ifdef CONFIG_PM_SLEEP 782 static int adp8860_i2c_suspend(struct device *dev) 783 { 784 struct i2c_client *client = to_i2c_client(dev); 785 786 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 787 788 return 0; 789 } 790 791 static int adp8860_i2c_resume(struct device *dev) 792 { 793 struct i2c_client *client = to_i2c_client(dev); 794 795 adp8860_set_bits(client, ADP8860_MDCR, NSTBY | BLEN); 796 797 return 0; 798 } 799 #endif 800 801 static SIMPLE_DEV_PM_OPS(adp8860_i2c_pm_ops, adp8860_i2c_suspend, 802 adp8860_i2c_resume); 803 804 static const struct i2c_device_id adp8860_id[] = { 805 { "adp8860", adp8860 }, 806 { "adp8861", adp8861 }, 807 { "adp8863", adp8863 }, 808 { } 809 }; 810 MODULE_DEVICE_TABLE(i2c, adp8860_id); 811 812 static struct i2c_driver adp8860_driver = { 813 .driver = { 814 .name = KBUILD_MODNAME, 815 .pm = &adp8860_i2c_pm_ops, 816 }, 817 .probe = adp8860_probe, 818 .remove = adp8860_remove, 819 .id_table = adp8860_id, 820 }; 821 822 module_i2c_driver(adp8860_driver); 823 824 MODULE_LICENSE("GPL v2"); 825 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 826 MODULE_DESCRIPTION("ADP8860 Backlight driver"); 827