1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Backlight driver for Analog Devices ADP8870 Backlight Devices 4 * 5 * Copyright 2009-2011 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/workqueue.h> 18 #include <linux/slab.h> 19 20 #include <linux/platform_data/adp8870.h> 21 #define ADP8870_EXT_FEATURES 22 #define ADP8870_USE_LEDS 23 24 25 #define ADP8870_MFDVID 0x00 /* Manufacturer and device ID */ 26 #define ADP8870_MDCR 0x01 /* Device mode and status */ 27 #define ADP8870_INT_STAT 0x02 /* Interrupts status */ 28 #define ADP8870_INT_EN 0x03 /* Interrupts enable */ 29 #define ADP8870_CFGR 0x04 /* Configuration register */ 30 #define ADP8870_BLSEL 0x05 /* Sink enable backlight or independent */ 31 #define ADP8870_PWMLED 0x06 /* PWM Enable Selection Register */ 32 #define ADP8870_BLOFF 0x07 /* Backlight off timeout */ 33 #define ADP8870_BLDIM 0x08 /* Backlight dim timeout */ 34 #define ADP8870_BLFR 0x09 /* Backlight fade in and out rates */ 35 #define ADP8870_BLMX1 0x0A /* Backlight (Brightness Level 1-daylight) maximum current */ 36 #define ADP8870_BLDM1 0x0B /* Backlight (Brightness Level 1-daylight) dim current */ 37 #define ADP8870_BLMX2 0x0C /* Backlight (Brightness Level 2-bright) maximum current */ 38 #define ADP8870_BLDM2 0x0D /* Backlight (Brightness Level 2-bright) dim current */ 39 #define ADP8870_BLMX3 0x0E /* Backlight (Brightness Level 3-office) maximum current */ 40 #define ADP8870_BLDM3 0x0F /* Backlight (Brightness Level 3-office) dim current */ 41 #define ADP8870_BLMX4 0x10 /* Backlight (Brightness Level 4-indoor) maximum current */ 42 #define ADP8870_BLDM4 0x11 /* Backlight (Brightness Level 4-indoor) dim current */ 43 #define ADP8870_BLMX5 0x12 /* Backlight (Brightness Level 5-dark) maximum current */ 44 #define ADP8870_BLDM5 0x13 /* Backlight (Brightness Level 5-dark) dim current */ 45 #define ADP8870_ISCLAW 0x1A /* Independent sink current fade law register */ 46 #define ADP8870_ISCC 0x1B /* Independent sink current control register */ 47 #define ADP8870_ISCT1 0x1C /* Independent Sink Current Timer Register LED[7:5] */ 48 #define ADP8870_ISCT2 0x1D /* Independent Sink Current Timer Register LED[4:1] */ 49 #define ADP8870_ISCF 0x1E /* Independent sink current fade register */ 50 #define ADP8870_ISC1 0x1F /* Independent Sink Current LED1 */ 51 #define ADP8870_ISC2 0x20 /* Independent Sink Current LED2 */ 52 #define ADP8870_ISC3 0x21 /* Independent Sink Current LED3 */ 53 #define ADP8870_ISC4 0x22 /* Independent Sink Current LED4 */ 54 #define ADP8870_ISC5 0x23 /* Independent Sink Current LED5 */ 55 #define ADP8870_ISC6 0x24 /* Independent Sink Current LED6 */ 56 #define ADP8870_ISC7 0x25 /* Independent Sink Current LED7 (Brightness Level 1-daylight) */ 57 #define ADP8870_ISC7_L2 0x26 /* Independent Sink Current LED7 (Brightness Level 2-bright) */ 58 #define ADP8870_ISC7_L3 0x27 /* Independent Sink Current LED7 (Brightness Level 3-office) */ 59 #define ADP8870_ISC7_L4 0x28 /* Independent Sink Current LED7 (Brightness Level 4-indoor) */ 60 #define ADP8870_ISC7_L5 0x29 /* Independent Sink Current LED7 (Brightness Level 5-dark) */ 61 #define ADP8870_CMP_CTL 0x2D /* ALS Comparator Control Register */ 62 #define ADP8870_ALS1_EN 0x2E /* Main ALS comparator level enable */ 63 #define ADP8870_ALS2_EN 0x2F /* Second ALS comparator level enable */ 64 #define ADP8870_ALS1_STAT 0x30 /* Main ALS Comparator Status Register */ 65 #define ADP8870_ALS2_STAT 0x31 /* Second ALS Comparator Status Register */ 66 #define ADP8870_L2TRP 0x32 /* L2 comparator reference */ 67 #define ADP8870_L2HYS 0x33 /* L2 hysteresis */ 68 #define ADP8870_L3TRP 0x34 /* L3 comparator reference */ 69 #define ADP8870_L3HYS 0x35 /* L3 hysteresis */ 70 #define ADP8870_L4TRP 0x36 /* L4 comparator reference */ 71 #define ADP8870_L4HYS 0x37 /* L4 hysteresis */ 72 #define ADP8870_L5TRP 0x38 /* L5 comparator reference */ 73 #define ADP8870_L5HYS 0x39 /* L5 hysteresis */ 74 #define ADP8870_PH1LEVL 0x40 /* First phototransistor ambient light level-low byte register */ 75 #define ADP8870_PH1LEVH 0x41 /* First phototransistor ambient light level-high byte register */ 76 #define ADP8870_PH2LEVL 0x42 /* Second phototransistor ambient light level-low byte register */ 77 #define ADP8870_PH2LEVH 0x43 /* Second phototransistor ambient light level-high byte register */ 78 79 #define ADP8870_MANUFID 0x3 /* Analog Devices AD8870 Manufacturer and device ID */ 80 #define ADP8870_DEVID(x) ((x) & 0xF) 81 #define ADP8870_MANID(x) ((x) >> 4) 82 83 /* MDCR Device mode and status */ 84 #define D7ALSEN (1 << 7) 85 #define INT_CFG (1 << 6) 86 #define NSTBY (1 << 5) 87 #define DIM_EN (1 << 4) 88 #define GDWN_DIS (1 << 3) 89 #define SIS_EN (1 << 2) 90 #define CMP_AUTOEN (1 << 1) 91 #define BLEN (1 << 0) 92 93 /* ADP8870_ALS1_EN Main ALS comparator level enable */ 94 #define L5_EN (1 << 3) 95 #define L4_EN (1 << 2) 96 #define L3_EN (1 << 1) 97 #define L2_EN (1 << 0) 98 99 #define CFGR_BLV_SHIFT 3 100 #define CFGR_BLV_MASK 0x7 101 #define ADP8870_FLAG_LED_MASK 0xFF 102 103 #define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4)) 104 #define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1)) 105 #define ALS_CMPR_CFG_VAL(filt) ((0x7 & (filt)) << 1) 106 107 struct adp8870_bl { 108 struct i2c_client *client; 109 struct backlight_device *bl; 110 struct adp8870_led *led; 111 struct adp8870_backlight_platform_data *pdata; 112 struct mutex lock; 113 unsigned long cached_daylight_max; 114 int id; 115 int revid; 116 int current_brightness; 117 }; 118 119 struct adp8870_led { 120 struct led_classdev cdev; 121 struct work_struct work; 122 struct i2c_client *client; 123 enum led_brightness new_brightness; 124 int id; 125 int flags; 126 }; 127 128 static int adp8870_read(struct i2c_client *client, int reg, uint8_t *val) 129 { 130 int ret; 131 132 ret = i2c_smbus_read_byte_data(client, reg); 133 if (ret < 0) { 134 dev_err(&client->dev, "failed reading at 0x%02x\n", reg); 135 return ret; 136 } 137 138 *val = ret; 139 return 0; 140 } 141 142 143 static int adp8870_write(struct i2c_client *client, u8 reg, u8 val) 144 { 145 int ret = i2c_smbus_write_byte_data(client, reg, val); 146 147 if (ret) 148 dev_err(&client->dev, "failed to write\n"); 149 150 return ret; 151 } 152 153 static int adp8870_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask) 154 { 155 struct adp8870_bl *data = i2c_get_clientdata(client); 156 uint8_t reg_val; 157 int ret; 158 159 mutex_lock(&data->lock); 160 161 ret = adp8870_read(client, reg, ®_val); 162 163 if (!ret && ((reg_val & bit_mask) != bit_mask)) { 164 reg_val |= bit_mask; 165 ret = adp8870_write(client, reg, reg_val); 166 } 167 168 mutex_unlock(&data->lock); 169 return ret; 170 } 171 172 static int adp8870_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask) 173 { 174 struct adp8870_bl *data = i2c_get_clientdata(client); 175 uint8_t reg_val; 176 int ret; 177 178 mutex_lock(&data->lock); 179 180 ret = adp8870_read(client, reg, ®_val); 181 182 if (!ret && (reg_val & bit_mask)) { 183 reg_val &= ~bit_mask; 184 ret = adp8870_write(client, reg, reg_val); 185 } 186 187 mutex_unlock(&data->lock); 188 return ret; 189 } 190 191 /* 192 * Independent sink / LED 193 */ 194 #if defined(ADP8870_USE_LEDS) 195 static void adp8870_led_work(struct work_struct *work) 196 { 197 struct adp8870_led *led = container_of(work, struct adp8870_led, work); 198 199 adp8870_write(led->client, ADP8870_ISC1 + led->id - 1, 200 led->new_brightness >> 1); 201 } 202 203 static void adp8870_led_set(struct led_classdev *led_cdev, 204 enum led_brightness value) 205 { 206 struct adp8870_led *led; 207 208 led = container_of(led_cdev, struct adp8870_led, cdev); 209 led->new_brightness = value; 210 /* 211 * Use workqueue for IO since I2C operations can sleep. 212 */ 213 schedule_work(&led->work); 214 } 215 216 static int adp8870_led_setup(struct adp8870_led *led) 217 { 218 struct i2c_client *client = led->client; 219 int ret = 0; 220 221 ret = adp8870_write(client, ADP8870_ISC1 + led->id - 1, 0); 222 if (ret) 223 return ret; 224 225 ret = adp8870_set_bits(client, ADP8870_ISCC, 1 << (led->id - 1)); 226 if (ret) 227 return ret; 228 229 if (led->id > 4) 230 ret = adp8870_set_bits(client, ADP8870_ISCT1, 231 (led->flags & 0x3) << ((led->id - 5) * 2)); 232 else 233 ret = adp8870_set_bits(client, ADP8870_ISCT2, 234 (led->flags & 0x3) << ((led->id - 1) * 2)); 235 236 return ret; 237 } 238 239 static int adp8870_led_probe(struct i2c_client *client) 240 { 241 struct adp8870_backlight_platform_data *pdata = 242 dev_get_platdata(&client->dev); 243 struct adp8870_bl *data = i2c_get_clientdata(client); 244 struct adp8870_led *led, *led_dat; 245 struct led_info *cur_led; 246 int ret, i; 247 248 led = devm_kcalloc(&client->dev, pdata->num_leds, sizeof(*led), 249 GFP_KERNEL); 250 if (led == NULL) 251 return -ENOMEM; 252 253 ret = adp8870_write(client, ADP8870_ISCLAW, pdata->led_fade_law); 254 if (ret) 255 return ret; 256 257 ret = adp8870_write(client, ADP8870_ISCT1, 258 (pdata->led_on_time & 0x3) << 6); 259 if (ret) 260 return ret; 261 262 ret = adp8870_write(client, ADP8870_ISCF, 263 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out)); 264 if (ret) 265 return ret; 266 267 for (i = 0; i < pdata->num_leds; ++i) { 268 cur_led = &pdata->leds[i]; 269 led_dat = &led[i]; 270 271 led_dat->id = cur_led->flags & ADP8870_FLAG_LED_MASK; 272 273 if (led_dat->id > 7 || led_dat->id < 1) { 274 dev_err(&client->dev, "Invalid LED ID %d\n", 275 led_dat->id); 276 ret = -EINVAL; 277 goto err; 278 } 279 280 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) { 281 dev_err(&client->dev, "LED %d used by Backlight\n", 282 led_dat->id); 283 ret = -EBUSY; 284 goto err; 285 } 286 287 led_dat->cdev.name = cur_led->name; 288 led_dat->cdev.default_trigger = cur_led->default_trigger; 289 led_dat->cdev.brightness_set = adp8870_led_set; 290 led_dat->cdev.brightness = LED_OFF; 291 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT; 292 led_dat->client = client; 293 led_dat->new_brightness = LED_OFF; 294 INIT_WORK(&led_dat->work, adp8870_led_work); 295 296 ret = led_classdev_register(&client->dev, &led_dat->cdev); 297 if (ret) { 298 dev_err(&client->dev, "failed to register LED %d\n", 299 led_dat->id); 300 goto err; 301 } 302 303 ret = adp8870_led_setup(led_dat); 304 if (ret) { 305 dev_err(&client->dev, "failed to write\n"); 306 i++; 307 goto err; 308 } 309 } 310 311 data->led = led; 312 313 return 0; 314 315 err: 316 for (i = i - 1; i >= 0; --i) { 317 led_classdev_unregister(&led[i].cdev); 318 cancel_work_sync(&led[i].work); 319 } 320 321 return ret; 322 } 323 324 static int adp8870_led_remove(struct i2c_client *client) 325 { 326 struct adp8870_backlight_platform_data *pdata = 327 dev_get_platdata(&client->dev); 328 struct adp8870_bl *data = i2c_get_clientdata(client); 329 int i; 330 331 for (i = 0; i < pdata->num_leds; i++) { 332 led_classdev_unregister(&data->led[i].cdev); 333 cancel_work_sync(&data->led[i].work); 334 } 335 336 return 0; 337 } 338 #else 339 static int adp8870_led_probe(struct i2c_client *client) 340 { 341 return 0; 342 } 343 344 static int adp8870_led_remove(struct i2c_client *client) 345 { 346 return 0; 347 } 348 #endif 349 350 static int adp8870_bl_set(struct backlight_device *bl, int brightness) 351 { 352 struct adp8870_bl *data = bl_get_data(bl); 353 struct i2c_client *client = data->client; 354 int ret = 0; 355 356 if (data->pdata->en_ambl_sens) { 357 if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) { 358 /* Disable Ambient Light auto adjust */ 359 ret = adp8870_clr_bits(client, ADP8870_MDCR, 360 CMP_AUTOEN); 361 if (ret) 362 return ret; 363 ret = adp8870_write(client, ADP8870_BLMX1, brightness); 364 if (ret) 365 return ret; 366 } else { 367 /* 368 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust 369 * restore daylight l1 sysfs brightness 370 */ 371 ret = adp8870_write(client, ADP8870_BLMX1, 372 data->cached_daylight_max); 373 if (ret) 374 return ret; 375 376 ret = adp8870_set_bits(client, ADP8870_MDCR, 377 CMP_AUTOEN); 378 if (ret) 379 return ret; 380 } 381 } else { 382 ret = adp8870_write(client, ADP8870_BLMX1, brightness); 383 if (ret) 384 return ret; 385 } 386 387 if (data->current_brightness && brightness == 0) 388 ret = adp8870_set_bits(client, 389 ADP8870_MDCR, DIM_EN); 390 else if (data->current_brightness == 0 && brightness) 391 ret = adp8870_clr_bits(client, 392 ADP8870_MDCR, DIM_EN); 393 394 if (!ret) 395 data->current_brightness = brightness; 396 397 return ret; 398 } 399 400 static int adp8870_bl_update_status(struct backlight_device *bl) 401 { 402 int brightness = bl->props.brightness; 403 404 if (bl->props.power != FB_BLANK_UNBLANK) 405 brightness = 0; 406 407 if (bl->props.fb_blank != FB_BLANK_UNBLANK) 408 brightness = 0; 409 410 return adp8870_bl_set(bl, brightness); 411 } 412 413 static int adp8870_bl_get_brightness(struct backlight_device *bl) 414 { 415 struct adp8870_bl *data = bl_get_data(bl); 416 417 return data->current_brightness; 418 } 419 420 static const struct backlight_ops adp8870_bl_ops = { 421 .update_status = adp8870_bl_update_status, 422 .get_brightness = adp8870_bl_get_brightness, 423 }; 424 425 static int adp8870_bl_setup(struct backlight_device *bl) 426 { 427 struct adp8870_bl *data = bl_get_data(bl); 428 struct i2c_client *client = data->client; 429 struct adp8870_backlight_platform_data *pdata = data->pdata; 430 int ret = 0; 431 432 ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign); 433 if (ret) 434 return ret; 435 436 ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign); 437 if (ret) 438 return ret; 439 440 ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max); 441 if (ret) 442 return ret; 443 444 ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim); 445 if (ret) 446 return ret; 447 448 if (pdata->en_ambl_sens) { 449 data->cached_daylight_max = pdata->l1_daylight_max; 450 ret = adp8870_write(client, ADP8870_BLMX2, 451 pdata->l2_bright_max); 452 if (ret) 453 return ret; 454 ret = adp8870_write(client, ADP8870_BLDM2, 455 pdata->l2_bright_dim); 456 if (ret) 457 return ret; 458 459 ret = adp8870_write(client, ADP8870_BLMX3, 460 pdata->l3_office_max); 461 if (ret) 462 return ret; 463 ret = adp8870_write(client, ADP8870_BLDM3, 464 pdata->l3_office_dim); 465 if (ret) 466 return ret; 467 468 ret = adp8870_write(client, ADP8870_BLMX4, 469 pdata->l4_indoor_max); 470 if (ret) 471 return ret; 472 473 ret = adp8870_write(client, ADP8870_BLDM4, 474 pdata->l4_indor_dim); 475 if (ret) 476 return ret; 477 478 ret = adp8870_write(client, ADP8870_BLMX5, 479 pdata->l5_dark_max); 480 if (ret) 481 return ret; 482 483 ret = adp8870_write(client, ADP8870_BLDM5, 484 pdata->l5_dark_dim); 485 if (ret) 486 return ret; 487 488 ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip); 489 if (ret) 490 return ret; 491 492 ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst); 493 if (ret) 494 return ret; 495 496 ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip); 497 if (ret) 498 return ret; 499 500 ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst); 501 if (ret) 502 return ret; 503 504 ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip); 505 if (ret) 506 return ret; 507 508 ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst); 509 if (ret) 510 return ret; 511 512 ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip); 513 if (ret) 514 return ret; 515 516 ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst); 517 if (ret) 518 return ret; 519 520 ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN | 521 L3_EN | L2_EN); 522 if (ret) 523 return ret; 524 525 ret = adp8870_write(client, ADP8870_CMP_CTL, 526 ALS_CMPR_CFG_VAL(pdata->abml_filt)); 527 if (ret) 528 return ret; 529 } 530 531 ret = adp8870_write(client, ADP8870_CFGR, 532 BL_CFGR_VAL(pdata->bl_fade_law, 0)); 533 if (ret) 534 return ret; 535 536 ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in, 537 pdata->bl_fade_out)); 538 if (ret) 539 return ret; 540 /* 541 * ADP8870 Rev0 requires GDWN_DIS bit set 542 */ 543 544 ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY | 545 (data->revid == 0 ? GDWN_DIS : 0)); 546 547 return ret; 548 } 549 550 static ssize_t adp8870_show(struct device *dev, char *buf, int reg) 551 { 552 struct adp8870_bl *data = dev_get_drvdata(dev); 553 int error; 554 uint8_t reg_val; 555 556 mutex_lock(&data->lock); 557 error = adp8870_read(data->client, reg, ®_val); 558 mutex_unlock(&data->lock); 559 560 if (error < 0) 561 return error; 562 563 return sprintf(buf, "%u\n", reg_val); 564 } 565 566 static ssize_t adp8870_store(struct device *dev, const char *buf, 567 size_t count, int reg) 568 { 569 struct adp8870_bl *data = dev_get_drvdata(dev); 570 unsigned long val; 571 int ret; 572 573 ret = kstrtoul(buf, 10, &val); 574 if (ret) 575 return ret; 576 577 mutex_lock(&data->lock); 578 adp8870_write(data->client, reg, val); 579 mutex_unlock(&data->lock); 580 581 return count; 582 } 583 584 static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev, 585 struct device_attribute *attr, char *buf) 586 { 587 return adp8870_show(dev, buf, ADP8870_BLMX5); 588 } 589 590 static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev, 591 struct device_attribute *attr, const char *buf, size_t count) 592 { 593 return adp8870_store(dev, buf, count, ADP8870_BLMX5); 594 } 595 static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show, 596 adp8870_bl_l5_dark_max_store); 597 598 599 static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev, 600 struct device_attribute *attr, char *buf) 601 { 602 return adp8870_show(dev, buf, ADP8870_BLMX4); 603 } 604 605 static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev, 606 struct device_attribute *attr, const char *buf, size_t count) 607 { 608 return adp8870_store(dev, buf, count, ADP8870_BLMX4); 609 } 610 static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show, 611 adp8870_bl_l4_indoor_max_store); 612 613 614 static ssize_t adp8870_bl_l3_office_max_show(struct device *dev, 615 struct device_attribute *attr, char *buf) 616 { 617 return adp8870_show(dev, buf, ADP8870_BLMX3); 618 } 619 620 static ssize_t adp8870_bl_l3_office_max_store(struct device *dev, 621 struct device_attribute *attr, const char *buf, size_t count) 622 { 623 return adp8870_store(dev, buf, count, ADP8870_BLMX3); 624 } 625 626 static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show, 627 adp8870_bl_l3_office_max_store); 628 629 static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev, 630 struct device_attribute *attr, char *buf) 631 { 632 return adp8870_show(dev, buf, ADP8870_BLMX2); 633 } 634 635 static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev, 636 struct device_attribute *attr, const char *buf, size_t count) 637 { 638 return adp8870_store(dev, buf, count, ADP8870_BLMX2); 639 } 640 static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show, 641 adp8870_bl_l2_bright_max_store); 642 643 static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev, 644 struct device_attribute *attr, char *buf) 645 { 646 return adp8870_show(dev, buf, ADP8870_BLMX1); 647 } 648 649 static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev, 650 struct device_attribute *attr, const char *buf, size_t count) 651 { 652 struct adp8870_bl *data = dev_get_drvdata(dev); 653 int ret = kstrtoul(buf, 10, &data->cached_daylight_max); 654 655 if (ret) 656 return ret; 657 658 return adp8870_store(dev, buf, count, ADP8870_BLMX1); 659 } 660 static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show, 661 adp8870_bl_l1_daylight_max_store); 662 663 static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev, 664 struct device_attribute *attr, char *buf) 665 { 666 return adp8870_show(dev, buf, ADP8870_BLDM5); 667 } 668 669 static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev, 670 struct device_attribute *attr, 671 const char *buf, size_t count) 672 { 673 return adp8870_store(dev, buf, count, ADP8870_BLDM5); 674 } 675 static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show, 676 adp8870_bl_l5_dark_dim_store); 677 678 static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev, 679 struct device_attribute *attr, char *buf) 680 { 681 return adp8870_show(dev, buf, ADP8870_BLDM4); 682 } 683 684 static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev, 685 struct device_attribute *attr, 686 const char *buf, size_t count) 687 { 688 return adp8870_store(dev, buf, count, ADP8870_BLDM4); 689 } 690 static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show, 691 adp8870_bl_l4_indoor_dim_store); 692 693 694 static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev, 695 struct device_attribute *attr, char *buf) 696 { 697 return adp8870_show(dev, buf, ADP8870_BLDM3); 698 } 699 700 static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev, 701 struct device_attribute *attr, 702 const char *buf, size_t count) 703 { 704 return adp8870_store(dev, buf, count, ADP8870_BLDM3); 705 } 706 static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show, 707 adp8870_bl_l3_office_dim_store); 708 709 static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev, 710 struct device_attribute *attr, char *buf) 711 { 712 return adp8870_show(dev, buf, ADP8870_BLDM2); 713 } 714 715 static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev, 716 struct device_attribute *attr, 717 const char *buf, size_t count) 718 { 719 return adp8870_store(dev, buf, count, ADP8870_BLDM2); 720 } 721 static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show, 722 adp8870_bl_l2_bright_dim_store); 723 724 static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev, 725 struct device_attribute *attr, char *buf) 726 { 727 return adp8870_show(dev, buf, ADP8870_BLDM1); 728 } 729 730 static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev, 731 struct device_attribute *attr, 732 const char *buf, size_t count) 733 { 734 return adp8870_store(dev, buf, count, ADP8870_BLDM1); 735 } 736 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show, 737 adp8870_bl_l1_daylight_dim_store); 738 739 #ifdef ADP8870_EXT_FEATURES 740 static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev, 741 struct device_attribute *attr, char *buf) 742 { 743 struct adp8870_bl *data = dev_get_drvdata(dev); 744 int error; 745 uint8_t reg_val; 746 uint16_t ret_val; 747 748 mutex_lock(&data->lock); 749 error = adp8870_read(data->client, ADP8870_PH1LEVL, ®_val); 750 if (error < 0) { 751 mutex_unlock(&data->lock); 752 return error; 753 } 754 ret_val = reg_val; 755 error = adp8870_read(data->client, ADP8870_PH1LEVH, ®_val); 756 mutex_unlock(&data->lock); 757 758 if (error < 0) 759 return error; 760 761 /* Return 13-bit conversion value for the first light sensor */ 762 ret_val += (reg_val & 0x1F) << 8; 763 764 return sprintf(buf, "%u\n", ret_val); 765 } 766 static DEVICE_ATTR(ambient_light_level, 0444, 767 adp8870_bl_ambient_light_level_show, NULL); 768 769 static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev, 770 struct device_attribute *attr, char *buf) 771 { 772 struct adp8870_bl *data = dev_get_drvdata(dev); 773 int error; 774 uint8_t reg_val; 775 776 mutex_lock(&data->lock); 777 error = adp8870_read(data->client, ADP8870_CFGR, ®_val); 778 mutex_unlock(&data->lock); 779 780 if (error < 0) 781 return error; 782 783 return sprintf(buf, "%u\n", 784 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1); 785 } 786 787 static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev, 788 struct device_attribute *attr, 789 const char *buf, size_t count) 790 { 791 struct adp8870_bl *data = dev_get_drvdata(dev); 792 unsigned long val; 793 uint8_t reg_val; 794 int ret; 795 796 ret = kstrtoul(buf, 10, &val); 797 if (ret) 798 return ret; 799 800 if (val == 0) { 801 /* Enable automatic ambient light sensing */ 802 adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN); 803 } else if ((val > 0) && (val < 6)) { 804 /* Disable automatic ambient light sensing */ 805 adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN); 806 807 /* Set user supplied ambient light zone */ 808 mutex_lock(&data->lock); 809 ret = adp8870_read(data->client, ADP8870_CFGR, ®_val); 810 if (!ret) { 811 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 812 reg_val |= (val - 1) << CFGR_BLV_SHIFT; 813 adp8870_write(data->client, ADP8870_CFGR, reg_val); 814 } 815 mutex_unlock(&data->lock); 816 } 817 818 return count; 819 } 820 static DEVICE_ATTR(ambient_light_zone, 0664, 821 adp8870_bl_ambient_light_zone_show, 822 adp8870_bl_ambient_light_zone_store); 823 #endif 824 825 static struct attribute *adp8870_bl_attributes[] = { 826 &dev_attr_l5_dark_max.attr, 827 &dev_attr_l5_dark_dim.attr, 828 &dev_attr_l4_indoor_max.attr, 829 &dev_attr_l4_indoor_dim.attr, 830 &dev_attr_l3_office_max.attr, 831 &dev_attr_l3_office_dim.attr, 832 &dev_attr_l2_bright_max.attr, 833 &dev_attr_l2_bright_dim.attr, 834 &dev_attr_l1_daylight_max.attr, 835 &dev_attr_l1_daylight_dim.attr, 836 #ifdef ADP8870_EXT_FEATURES 837 &dev_attr_ambient_light_level.attr, 838 &dev_attr_ambient_light_zone.attr, 839 #endif 840 NULL 841 }; 842 843 static const struct attribute_group adp8870_bl_attr_group = { 844 .attrs = adp8870_bl_attributes, 845 }; 846 847 static int adp8870_probe(struct i2c_client *client, 848 const struct i2c_device_id *id) 849 { 850 struct backlight_properties props; 851 struct backlight_device *bl; 852 struct adp8870_bl *data; 853 struct adp8870_backlight_platform_data *pdata = 854 dev_get_platdata(&client->dev); 855 uint8_t reg_val; 856 int ret; 857 858 if (!i2c_check_functionality(client->adapter, 859 I2C_FUNC_SMBUS_BYTE_DATA)) { 860 dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); 861 return -EIO; 862 } 863 864 if (!pdata) { 865 dev_err(&client->dev, "no platform data?\n"); 866 return -EINVAL; 867 } 868 869 ret = adp8870_read(client, ADP8870_MFDVID, ®_val); 870 if (ret < 0) 871 return -EIO; 872 873 if (ADP8870_MANID(reg_val) != ADP8870_MANUFID) { 874 dev_err(&client->dev, "failed to probe\n"); 875 return -ENODEV; 876 } 877 878 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 879 if (data == NULL) 880 return -ENOMEM; 881 882 data->revid = ADP8870_DEVID(reg_val); 883 data->client = client; 884 data->pdata = pdata; 885 data->id = id->driver_data; 886 data->current_brightness = 0; 887 i2c_set_clientdata(client, data); 888 889 mutex_init(&data->lock); 890 891 memset(&props, 0, sizeof(props)); 892 props.type = BACKLIGHT_RAW; 893 props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS; 894 bl = devm_backlight_device_register(&client->dev, 895 dev_driver_string(&client->dev), 896 &client->dev, data, &adp8870_bl_ops, &props); 897 if (IS_ERR(bl)) { 898 dev_err(&client->dev, "failed to register backlight\n"); 899 return PTR_ERR(bl); 900 } 901 902 data->bl = bl; 903 904 if (pdata->en_ambl_sens) { 905 ret = sysfs_create_group(&bl->dev.kobj, 906 &adp8870_bl_attr_group); 907 if (ret) { 908 dev_err(&client->dev, "failed to register sysfs\n"); 909 return ret; 910 } 911 } 912 913 ret = adp8870_bl_setup(bl); 914 if (ret) { 915 ret = -EIO; 916 goto out; 917 } 918 919 backlight_update_status(bl); 920 921 dev_info(&client->dev, "Rev.%d Backlight\n", data->revid); 922 923 if (pdata->num_leds) 924 adp8870_led_probe(client); 925 926 return 0; 927 928 out: 929 if (data->pdata->en_ambl_sens) 930 sysfs_remove_group(&data->bl->dev.kobj, 931 &adp8870_bl_attr_group); 932 933 return ret; 934 } 935 936 static int adp8870_remove(struct i2c_client *client) 937 { 938 struct adp8870_bl *data = i2c_get_clientdata(client); 939 940 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY); 941 942 if (data->led) 943 adp8870_led_remove(client); 944 945 if (data->pdata->en_ambl_sens) 946 sysfs_remove_group(&data->bl->dev.kobj, 947 &adp8870_bl_attr_group); 948 949 return 0; 950 } 951 952 #ifdef CONFIG_PM_SLEEP 953 static int adp8870_i2c_suspend(struct device *dev) 954 { 955 struct i2c_client *client = to_i2c_client(dev); 956 957 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY); 958 959 return 0; 960 } 961 962 static int adp8870_i2c_resume(struct device *dev) 963 { 964 struct i2c_client *client = to_i2c_client(dev); 965 966 adp8870_set_bits(client, ADP8870_MDCR, NSTBY | BLEN); 967 968 return 0; 969 } 970 #endif 971 972 static SIMPLE_DEV_PM_OPS(adp8870_i2c_pm_ops, adp8870_i2c_suspend, 973 adp8870_i2c_resume); 974 975 static const struct i2c_device_id adp8870_id[] = { 976 { "adp8870", 0 }, 977 { } 978 }; 979 MODULE_DEVICE_TABLE(i2c, adp8870_id); 980 981 static struct i2c_driver adp8870_driver = { 982 .driver = { 983 .name = KBUILD_MODNAME, 984 .pm = &adp8870_i2c_pm_ops, 985 }, 986 .probe = adp8870_probe, 987 .remove = adp8870_remove, 988 .id_table = adp8870_id, 989 }; 990 991 module_i2c_driver(adp8870_driver); 992 993 MODULE_LICENSE("GPL v2"); 994 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 995 MODULE_DESCRIPTION("ADP8870 Backlight driver"); 996