1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Backlight driver for Analog Devices ADP8860 Backlight Devices 4 * 5 * Copyright 2009-2010 Analog Devices Inc. 6 */ 7 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/errno.h> 11 #include <linux/pm.h> 12 #include <linux/platform_device.h> 13 #include <linux/i2c.h> 14 #include <linux/fb.h> 15 #include <linux/backlight.h> 16 #include <linux/leds.h> 17 #include <linux/slab.h> 18 #include <linux/workqueue.h> 19 20 #include <linux/platform_data/adp8860.h> 21 #define ADP8860_EXT_FEATURES 22 #define ADP8860_USE_LEDS 23 24 #define ADP8860_MFDVID 0x00 /* Manufacturer and device ID */ 25 #define ADP8860_MDCR 0x01 /* Device mode and status */ 26 #define ADP8860_MDCR2 0x02 /* Device mode and Status Register 2 */ 27 #define ADP8860_INTR_EN 0x03 /* Interrupts enable */ 28 #define ADP8860_CFGR 0x04 /* Configuration register */ 29 #define ADP8860_BLSEN 0x05 /* Sink enable backlight or independent */ 30 #define ADP8860_BLOFF 0x06 /* Backlight off timeout */ 31 #define ADP8860_BLDIM 0x07 /* Backlight dim timeout */ 32 #define ADP8860_BLFR 0x08 /* Backlight fade in and out rates */ 33 #define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */ 34 #define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */ 35 #define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */ 36 #define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */ 37 #define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */ 38 #define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */ 39 #define ADP8860_ISCFR 0x0F /* Independent sink current fade control register */ 40 #define ADP8860_ISCC 0x10 /* Independent sink current control register */ 41 #define ADP8860_ISCT1 0x11 /* Independent Sink Current Timer Register LED[7:5] */ 42 #define ADP8860_ISCT2 0x12 /* Independent Sink Current Timer Register LED[4:1] */ 43 #define ADP8860_ISCF 0x13 /* Independent sink current fade register */ 44 #define ADP8860_ISC7 0x14 /* Independent Sink Current LED7 */ 45 #define ADP8860_ISC6 0x15 /* Independent Sink Current LED6 */ 46 #define ADP8860_ISC5 0x16 /* Independent Sink Current LED5 */ 47 #define ADP8860_ISC4 0x17 /* Independent Sink Current LED4 */ 48 #define ADP8860_ISC3 0x18 /* Independent Sink Current LED3 */ 49 #define ADP8860_ISC2 0x19 /* Independent Sink Current LED2 */ 50 #define ADP8860_ISC1 0x1A /* Independent Sink Current LED1 */ 51 #define ADP8860_CCFG 0x1B /* Comparator configuration */ 52 #define ADP8860_CCFG2 0x1C /* Second comparator configuration */ 53 #define ADP8860_L2_TRP 0x1D /* L2 comparator reference */ 54 #define ADP8860_L2_HYS 0x1E /* L2 hysteresis */ 55 #define ADP8860_L3_TRP 0x1F /* L3 comparator reference */ 56 #define ADP8860_L3_HYS 0x20 /* L3 hysteresis */ 57 #define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */ 58 #define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */ 59 #define ADP8860_PH2LEVL 0x23 /* Second phototransistor ambient light level-low byte register */ 60 #define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */ 61 62 #define ADP8860_MANUFID 0x0 /* Analog Devices ADP8860 Manufacturer ID */ 63 #define ADP8861_MANUFID 0x4 /* Analog Devices ADP8861 Manufacturer ID */ 64 #define ADP8863_MANUFID 0x2 /* Analog Devices ADP8863 Manufacturer ID */ 65 66 #define ADP8860_DEVID(x) ((x) & 0xF) 67 #define ADP8860_MANID(x) ((x) >> 4) 68 69 /* MDCR Device mode and status */ 70 #define INT_CFG (1 << 6) 71 #define NSTBY (1 << 5) 72 #define DIM_EN (1 << 4) 73 #define GDWN_DIS (1 << 3) 74 #define SIS_EN (1 << 2) 75 #define CMP_AUTOEN (1 << 1) 76 #define BLEN (1 << 0) 77 78 /* ADP8860_CCFG Main ALS comparator level enable */ 79 #define L3_EN (1 << 1) 80 #define L2_EN (1 << 0) 81 82 #define CFGR_BLV_SHIFT 3 83 #define CFGR_BLV_MASK 0x3 84 #define ADP8860_FLAG_LED_MASK 0xFF 85 86 #define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4)) 87 #define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1)) 88 #define ALS_CCFG_VAL(filt) ((0x7 & filt) << 5) 89 90 enum { 91 adp8860, 92 adp8861, 93 adp8863 94 }; 95 96 struct adp8860_led { 97 struct led_classdev cdev; 98 struct work_struct work; 99 struct i2c_client *client; 100 enum led_brightness new_brightness; 101 int id; 102 int flags; 103 }; 104 105 struct adp8860_bl { 106 struct i2c_client *client; 107 struct backlight_device *bl; 108 struct adp8860_led *led; 109 struct adp8860_backlight_platform_data *pdata; 110 struct mutex lock; 111 unsigned long cached_daylight_max; 112 int id; 113 int revid; 114 int current_brightness; 115 unsigned en_ambl_sens:1; 116 unsigned gdwn_dis:1; 117 }; 118 119 static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val) 120 { 121 int ret; 122 123 ret = i2c_smbus_read_byte_data(client, reg); 124 if (ret < 0) { 125 dev_err(&client->dev, "failed reading at 0x%02x\n", reg); 126 return ret; 127 } 128 129 *val = (uint8_t)ret; 130 return 0; 131 } 132 133 static int adp8860_write(struct i2c_client *client, u8 reg, u8 val) 134 { 135 return i2c_smbus_write_byte_data(client, reg, val); 136 } 137 138 static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask) 139 { 140 struct adp8860_bl *data = i2c_get_clientdata(client); 141 uint8_t reg_val; 142 int ret; 143 144 mutex_lock(&data->lock); 145 146 ret = adp8860_read(client, reg, ®_val); 147 148 if (!ret && ((reg_val & bit_mask) != bit_mask)) { 149 reg_val |= bit_mask; 150 ret = adp8860_write(client, reg, reg_val); 151 } 152 153 mutex_unlock(&data->lock); 154 return ret; 155 } 156 157 static int adp8860_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask) 158 { 159 struct adp8860_bl *data = i2c_get_clientdata(client); 160 uint8_t reg_val; 161 int ret; 162 163 mutex_lock(&data->lock); 164 165 ret = adp8860_read(client, reg, ®_val); 166 167 if (!ret && (reg_val & bit_mask)) { 168 reg_val &= ~bit_mask; 169 ret = adp8860_write(client, reg, reg_val); 170 } 171 172 mutex_unlock(&data->lock); 173 return ret; 174 } 175 176 /* 177 * Independent sink / LED 178 */ 179 #if defined(ADP8860_USE_LEDS) 180 static void adp8860_led_work(struct work_struct *work) 181 { 182 struct adp8860_led *led = container_of(work, struct adp8860_led, work); 183 184 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_kcalloc(&client->dev, pdata->num_leds, sizeof(*led), 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; 365 366 if (bl->props.power != FB_BLANK_UNBLANK) 367 brightness = 0; 368 369 if (bl->props.fb_blank != FB_BLANK_UNBLANK) 370 brightness = 0; 371 372 return adp8860_bl_set(bl, brightness); 373 } 374 375 static int adp8860_bl_get_brightness(struct backlight_device *bl) 376 { 377 struct adp8860_bl *data = bl_get_data(bl); 378 379 return data->current_brightness; 380 } 381 382 static const struct backlight_ops adp8860_bl_ops = { 383 .update_status = adp8860_bl_update_status, 384 .get_brightness = adp8860_bl_get_brightness, 385 }; 386 387 static int adp8860_bl_setup(struct backlight_device *bl) 388 { 389 struct adp8860_bl *data = bl_get_data(bl); 390 struct i2c_client *client = data->client; 391 struct adp8860_backlight_platform_data *pdata = data->pdata; 392 int ret = 0; 393 394 ret |= adp8860_write(client, ADP8860_BLSEN, ~pdata->bl_led_assign); 395 ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max); 396 ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim); 397 398 if (data->en_ambl_sens) { 399 data->cached_daylight_max = pdata->l1_daylight_max; 400 ret |= adp8860_write(client, ADP8860_BLMX2, 401 pdata->l2_office_max); 402 ret |= adp8860_write(client, ADP8860_BLDM2, 403 pdata->l2_office_dim); 404 ret |= adp8860_write(client, ADP8860_BLMX3, 405 pdata->l3_dark_max); 406 ret |= adp8860_write(client, ADP8860_BLDM3, 407 pdata->l3_dark_dim); 408 409 ret |= adp8860_write(client, ADP8860_L2_TRP, pdata->l2_trip); 410 ret |= adp8860_write(client, ADP8860_L2_HYS, pdata->l2_hyst); 411 ret |= adp8860_write(client, ADP8860_L3_TRP, pdata->l3_trip); 412 ret |= adp8860_write(client, ADP8860_L3_HYS, pdata->l3_hyst); 413 ret |= adp8860_write(client, ADP8860_CCFG, L2_EN | L3_EN | 414 ALS_CCFG_VAL(pdata->abml_filt)); 415 } 416 417 ret |= adp8860_write(client, ADP8860_CFGR, 418 BL_CFGR_VAL(pdata->bl_fade_law, 0)); 419 420 ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in, 421 pdata->bl_fade_out)); 422 423 ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY | 424 (data->gdwn_dis ? GDWN_DIS : 0)); 425 426 return ret; 427 } 428 429 static ssize_t adp8860_show(struct device *dev, char *buf, int reg) 430 { 431 struct adp8860_bl *data = dev_get_drvdata(dev); 432 int error; 433 uint8_t reg_val; 434 435 mutex_lock(&data->lock); 436 error = adp8860_read(data->client, reg, ®_val); 437 mutex_unlock(&data->lock); 438 439 if (error < 0) 440 return error; 441 442 return sprintf(buf, "%u\n", reg_val); 443 } 444 445 static ssize_t adp8860_store(struct device *dev, const char *buf, 446 size_t count, int reg) 447 { 448 struct adp8860_bl *data = dev_get_drvdata(dev); 449 unsigned long val; 450 int ret; 451 452 ret = kstrtoul(buf, 10, &val); 453 if (ret) 454 return ret; 455 456 mutex_lock(&data->lock); 457 adp8860_write(data->client, reg, val); 458 mutex_unlock(&data->lock); 459 460 return count; 461 } 462 463 static ssize_t adp8860_bl_l3_dark_max_show(struct device *dev, 464 struct device_attribute *attr, char *buf) 465 { 466 return adp8860_show(dev, buf, ADP8860_BLMX3); 467 } 468 469 static ssize_t adp8860_bl_l3_dark_max_store(struct device *dev, 470 struct device_attribute *attr, const char *buf, size_t count) 471 { 472 return adp8860_store(dev, buf, count, ADP8860_BLMX3); 473 } 474 475 static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show, 476 adp8860_bl_l3_dark_max_store); 477 478 static ssize_t adp8860_bl_l2_office_max_show(struct device *dev, 479 struct device_attribute *attr, char *buf) 480 { 481 return adp8860_show(dev, buf, ADP8860_BLMX2); 482 } 483 484 static ssize_t adp8860_bl_l2_office_max_store(struct device *dev, 485 struct device_attribute *attr, const char *buf, size_t count) 486 { 487 return adp8860_store(dev, buf, count, ADP8860_BLMX2); 488 } 489 static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show, 490 adp8860_bl_l2_office_max_store); 491 492 static ssize_t adp8860_bl_l1_daylight_max_show(struct device *dev, 493 struct device_attribute *attr, char *buf) 494 { 495 return adp8860_show(dev, buf, ADP8860_BLMX1); 496 } 497 498 static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev, 499 struct device_attribute *attr, const char *buf, size_t count) 500 { 501 struct adp8860_bl *data = dev_get_drvdata(dev); 502 int ret = kstrtoul(buf, 10, &data->cached_daylight_max); 503 504 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 if (!error) { 569 ret_val = reg_val; 570 error = adp8860_read(data->client, ADP8860_PH1LEVH, ®_val); 571 } 572 mutex_unlock(&data->lock); 573 574 if (error) 575 return error; 576 577 /* Return 13-bit conversion value for the first light sensor */ 578 ret_val += (reg_val & 0x1F) << 8; 579 580 return sprintf(buf, "%u\n", ret_val); 581 } 582 static DEVICE_ATTR(ambient_light_level, 0444, 583 adp8860_bl_ambient_light_level_show, NULL); 584 585 static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev, 586 struct device_attribute *attr, char *buf) 587 { 588 struct adp8860_bl *data = dev_get_drvdata(dev); 589 int error; 590 uint8_t reg_val; 591 592 mutex_lock(&data->lock); 593 error = adp8860_read(data->client, ADP8860_CFGR, ®_val); 594 mutex_unlock(&data->lock); 595 596 if (error < 0) 597 return error; 598 599 return sprintf(buf, "%u\n", 600 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1); 601 } 602 603 static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev, 604 struct device_attribute *attr, 605 const char *buf, size_t count) 606 { 607 struct adp8860_bl *data = dev_get_drvdata(dev); 608 unsigned long val; 609 uint8_t reg_val; 610 int ret; 611 612 ret = kstrtoul(buf, 10, &val); 613 if (ret) 614 return ret; 615 616 if (val == 0) { 617 /* Enable automatic ambient light sensing */ 618 adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 619 } else if ((val > 0) && (val <= 3)) { 620 /* Disable automatic ambient light sensing */ 621 adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 622 623 /* Set user supplied ambient light zone */ 624 mutex_lock(&data->lock); 625 ret = adp8860_read(data->client, ADP8860_CFGR, ®_val); 626 if (!ret) { 627 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 628 reg_val |= (val - 1) << CFGR_BLV_SHIFT; 629 adp8860_write(data->client, ADP8860_CFGR, reg_val); 630 } 631 mutex_unlock(&data->lock); 632 } 633 634 return count; 635 } 636 static DEVICE_ATTR(ambient_light_zone, 0664, 637 adp8860_bl_ambient_light_zone_show, 638 adp8860_bl_ambient_light_zone_store); 639 #endif 640 641 static struct attribute *adp8860_bl_attributes[] = { 642 &dev_attr_l3_dark_max.attr, 643 &dev_attr_l3_dark_dim.attr, 644 &dev_attr_l2_office_max.attr, 645 &dev_attr_l2_office_dim.attr, 646 &dev_attr_l1_daylight_max.attr, 647 &dev_attr_l1_daylight_dim.attr, 648 #ifdef ADP8860_EXT_FEATURES 649 &dev_attr_ambient_light_level.attr, 650 &dev_attr_ambient_light_zone.attr, 651 #endif 652 NULL 653 }; 654 655 static const struct attribute_group adp8860_bl_attr_group = { 656 .attrs = adp8860_bl_attributes, 657 }; 658 659 static int adp8860_probe(struct i2c_client *client, 660 const struct i2c_device_id *id) 661 { 662 struct backlight_device *bl; 663 struct adp8860_bl *data; 664 struct adp8860_backlight_platform_data *pdata = 665 dev_get_platdata(&client->dev); 666 struct backlight_properties props; 667 uint8_t reg_val; 668 int ret; 669 670 if (!i2c_check_functionality(client->adapter, 671 I2C_FUNC_SMBUS_BYTE_DATA)) { 672 dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); 673 return -EIO; 674 } 675 676 if (!pdata) { 677 dev_err(&client->dev, "no platform data?\n"); 678 return -EINVAL; 679 } 680 681 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 682 if (data == NULL) 683 return -ENOMEM; 684 685 ret = adp8860_read(client, ADP8860_MFDVID, ®_val); 686 if (ret < 0) 687 return ret; 688 689 switch (ADP8860_MANID(reg_val)) { 690 case ADP8863_MANUFID: 691 data->gdwn_dis = !!pdata->gdwn_dis; 692 /* fall through */ 693 case ADP8860_MANUFID: 694 data->en_ambl_sens = !!pdata->en_ambl_sens; 695 break; 696 case ADP8861_MANUFID: 697 data->gdwn_dis = !!pdata->gdwn_dis; 698 break; 699 default: 700 dev_err(&client->dev, "failed to probe\n"); 701 return -ENODEV; 702 } 703 704 /* It's confirmed that the DEVID field is actually a REVID */ 705 706 data->revid = ADP8860_DEVID(reg_val); 707 data->client = client; 708 data->pdata = pdata; 709 data->id = id->driver_data; 710 data->current_brightness = 0; 711 i2c_set_clientdata(client, data); 712 713 memset(&props, 0, sizeof(props)); 714 props.type = BACKLIGHT_RAW; 715 props.max_brightness = ADP8860_MAX_BRIGHTNESS; 716 717 mutex_init(&data->lock); 718 719 bl = devm_backlight_device_register(&client->dev, 720 dev_driver_string(&client->dev), 721 &client->dev, data, &adp8860_bl_ops, &props); 722 if (IS_ERR(bl)) { 723 dev_err(&client->dev, "failed to register backlight\n"); 724 return PTR_ERR(bl); 725 } 726 727 bl->props.brightness = ADP8860_MAX_BRIGHTNESS; 728 729 data->bl = bl; 730 731 if (data->en_ambl_sens) 732 ret = sysfs_create_group(&bl->dev.kobj, 733 &adp8860_bl_attr_group); 734 735 if (ret) { 736 dev_err(&client->dev, "failed to register sysfs\n"); 737 return ret; 738 } 739 740 ret = adp8860_bl_setup(bl); 741 if (ret) { 742 ret = -EIO; 743 goto out; 744 } 745 746 backlight_update_status(bl); 747 748 dev_info(&client->dev, "%s Rev.%d Backlight\n", 749 client->name, data->revid); 750 751 if (pdata->num_leds) 752 adp8860_led_probe(client); 753 754 return 0; 755 756 out: 757 if (data->en_ambl_sens) 758 sysfs_remove_group(&data->bl->dev.kobj, 759 &adp8860_bl_attr_group); 760 761 return ret; 762 } 763 764 static int adp8860_remove(struct i2c_client *client) 765 { 766 struct adp8860_bl *data = i2c_get_clientdata(client); 767 768 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 769 770 if (data->led) 771 adp8860_led_remove(client); 772 773 if (data->en_ambl_sens) 774 sysfs_remove_group(&data->bl->dev.kobj, 775 &adp8860_bl_attr_group); 776 777 return 0; 778 } 779 780 #ifdef CONFIG_PM_SLEEP 781 static int adp8860_i2c_suspend(struct device *dev) 782 { 783 struct i2c_client *client = to_i2c_client(dev); 784 785 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 786 787 return 0; 788 } 789 790 static int adp8860_i2c_resume(struct device *dev) 791 { 792 struct i2c_client *client = to_i2c_client(dev); 793 794 adp8860_set_bits(client, ADP8860_MDCR, NSTBY | BLEN); 795 796 return 0; 797 } 798 #endif 799 800 static SIMPLE_DEV_PM_OPS(adp8860_i2c_pm_ops, adp8860_i2c_suspend, 801 adp8860_i2c_resume); 802 803 static const struct i2c_device_id adp8860_id[] = { 804 { "adp8860", adp8860 }, 805 { "adp8861", adp8861 }, 806 { "adp8863", adp8863 }, 807 { } 808 }; 809 MODULE_DEVICE_TABLE(i2c, adp8860_id); 810 811 static struct i2c_driver adp8860_driver = { 812 .driver = { 813 .name = KBUILD_MODNAME, 814 .pm = &adp8860_i2c_pm_ops, 815 }, 816 .probe = adp8860_probe, 817 .remove = adp8860_remove, 818 .id_table = adp8860_id, 819 }; 820 821 module_i2c_driver(adp8860_driver); 822 823 MODULE_LICENSE("GPL v2"); 824 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 825 MODULE_DESCRIPTION("ADP8860 Backlight driver"); 826