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