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 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 adp8870_write(led->client, ADP8870_ISC1 + led->id - 1, 199 led->new_brightness >> 1); 200 } 201 202 static void adp8870_led_set(struct led_classdev *led_cdev, 203 enum led_brightness value) 204 { 205 struct adp8870_led *led; 206 207 led = container_of(led_cdev, struct adp8870_led, cdev); 208 led->new_brightness = value; 209 /* 210 * Use workqueue for IO since I2C operations can sleep. 211 */ 212 schedule_work(&led->work); 213 } 214 215 static int adp8870_led_setup(struct adp8870_led *led) 216 { 217 struct i2c_client *client = led->client; 218 int ret = 0; 219 220 ret = adp8870_write(client, ADP8870_ISC1 + led->id - 1, 0); 221 if (ret) 222 return ret; 223 224 ret = adp8870_set_bits(client, ADP8870_ISCC, 1 << (led->id - 1)); 225 if (ret) 226 return ret; 227 228 if (led->id > 4) 229 ret = adp8870_set_bits(client, ADP8870_ISCT1, 230 (led->flags & 0x3) << ((led->id - 5) * 2)); 231 else 232 ret = adp8870_set_bits(client, ADP8870_ISCT2, 233 (led->flags & 0x3) << ((led->id - 1) * 2)); 234 235 return ret; 236 } 237 238 static int adp8870_led_probe(struct i2c_client *client) 239 { 240 struct adp8870_backlight_platform_data *pdata = 241 dev_get_platdata(&client->dev); 242 struct adp8870_bl *data = i2c_get_clientdata(client); 243 struct adp8870_led *led, *led_dat; 244 struct led_info *cur_led; 245 int ret, i; 246 247 led = devm_kzalloc(&client->dev, pdata->num_leds * sizeof(*led), 248 GFP_KERNEL); 249 if (led == NULL) { 250 dev_err(&client->dev, "failed to alloc memory\n"); 251 return -ENOMEM; 252 } 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 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 if (ret) 655 return ret; 656 657 return adp8870_store(dev, buf, count, ADP8870_BLMX1); 658 } 659 static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show, 660 adp8870_bl_l1_daylight_max_store); 661 662 static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev, 663 struct device_attribute *attr, char *buf) 664 { 665 return adp8870_show(dev, buf, ADP8870_BLDM5); 666 } 667 668 static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev, 669 struct device_attribute *attr, 670 const char *buf, size_t count) 671 { 672 return adp8870_store(dev, buf, count, ADP8870_BLDM5); 673 } 674 static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show, 675 adp8870_bl_l5_dark_dim_store); 676 677 static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev, 678 struct device_attribute *attr, char *buf) 679 { 680 return adp8870_show(dev, buf, ADP8870_BLDM4); 681 } 682 683 static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev, 684 struct device_attribute *attr, 685 const char *buf, size_t count) 686 { 687 return adp8870_store(dev, buf, count, ADP8870_BLDM4); 688 } 689 static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show, 690 adp8870_bl_l4_indoor_dim_store); 691 692 693 static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev, 694 struct device_attribute *attr, char *buf) 695 { 696 return adp8870_show(dev, buf, ADP8870_BLDM3); 697 } 698 699 static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev, 700 struct device_attribute *attr, 701 const char *buf, size_t count) 702 { 703 return adp8870_store(dev, buf, count, ADP8870_BLDM3); 704 } 705 static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show, 706 adp8870_bl_l3_office_dim_store); 707 708 static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev, 709 struct device_attribute *attr, char *buf) 710 { 711 return adp8870_show(dev, buf, ADP8870_BLDM2); 712 } 713 714 static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev, 715 struct device_attribute *attr, 716 const char *buf, size_t count) 717 { 718 return adp8870_store(dev, buf, count, ADP8870_BLDM2); 719 } 720 static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show, 721 adp8870_bl_l2_bright_dim_store); 722 723 static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev, 724 struct device_attribute *attr, char *buf) 725 { 726 return adp8870_show(dev, buf, ADP8870_BLDM1); 727 } 728 729 static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev, 730 struct device_attribute *attr, 731 const char *buf, size_t count) 732 { 733 return adp8870_store(dev, buf, count, ADP8870_BLDM1); 734 } 735 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show, 736 adp8870_bl_l1_daylight_dim_store); 737 738 #ifdef ADP8870_EXT_FEATURES 739 static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev, 740 struct device_attribute *attr, char *buf) 741 { 742 struct adp8870_bl *data = dev_get_drvdata(dev); 743 int error; 744 uint8_t reg_val; 745 uint16_t ret_val; 746 747 mutex_lock(&data->lock); 748 error = adp8870_read(data->client, ADP8870_PH1LEVL, ®_val); 749 if (error < 0) { 750 mutex_unlock(&data->lock); 751 return error; 752 } 753 ret_val = reg_val; 754 error = adp8870_read(data->client, ADP8870_PH1LEVH, ®_val); 755 mutex_unlock(&data->lock); 756 757 if (error < 0) 758 return error; 759 760 /* Return 13-bit conversion value for the first light sensor */ 761 ret_val += (reg_val & 0x1F) << 8; 762 763 return sprintf(buf, "%u\n", ret_val); 764 } 765 static DEVICE_ATTR(ambient_light_level, 0444, 766 adp8870_bl_ambient_light_level_show, NULL); 767 768 static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev, 769 struct device_attribute *attr, char *buf) 770 { 771 struct adp8870_bl *data = dev_get_drvdata(dev); 772 int error; 773 uint8_t reg_val; 774 775 mutex_lock(&data->lock); 776 error = adp8870_read(data->client, ADP8870_CFGR, ®_val); 777 mutex_unlock(&data->lock); 778 779 if (error < 0) 780 return error; 781 782 return sprintf(buf, "%u\n", 783 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1); 784 } 785 786 static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev, 787 struct device_attribute *attr, 788 const char *buf, size_t count) 789 { 790 struct adp8870_bl *data = dev_get_drvdata(dev); 791 unsigned long val; 792 uint8_t reg_val; 793 int ret; 794 795 ret = kstrtoul(buf, 10, &val); 796 if (ret) 797 return ret; 798 799 if (val == 0) { 800 /* Enable automatic ambient light sensing */ 801 adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN); 802 } else if ((val > 0) && (val < 6)) { 803 /* Disable automatic ambient light sensing */ 804 adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN); 805 806 /* Set user supplied ambient light zone */ 807 mutex_lock(&data->lock); 808 adp8870_read(data->client, ADP8870_CFGR, ®_val); 809 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 810 reg_val |= (val - 1) << CFGR_BLV_SHIFT; 811 adp8870_write(data->client, ADP8870_CFGR, reg_val); 812 mutex_unlock(&data->lock); 813 } 814 815 return count; 816 } 817 static DEVICE_ATTR(ambient_light_zone, 0664, 818 adp8870_bl_ambient_light_zone_show, 819 adp8870_bl_ambient_light_zone_store); 820 #endif 821 822 static struct attribute *adp8870_bl_attributes[] = { 823 &dev_attr_l5_dark_max.attr, 824 &dev_attr_l5_dark_dim.attr, 825 &dev_attr_l4_indoor_max.attr, 826 &dev_attr_l4_indoor_dim.attr, 827 &dev_attr_l3_office_max.attr, 828 &dev_attr_l3_office_dim.attr, 829 &dev_attr_l2_bright_max.attr, 830 &dev_attr_l2_bright_dim.attr, 831 &dev_attr_l1_daylight_max.attr, 832 &dev_attr_l1_daylight_dim.attr, 833 #ifdef ADP8870_EXT_FEATURES 834 &dev_attr_ambient_light_level.attr, 835 &dev_attr_ambient_light_zone.attr, 836 #endif 837 NULL 838 }; 839 840 static const struct attribute_group adp8870_bl_attr_group = { 841 .attrs = adp8870_bl_attributes, 842 }; 843 844 static int adp8870_probe(struct i2c_client *client, 845 const struct i2c_device_id *id) 846 { 847 struct backlight_properties props; 848 struct backlight_device *bl; 849 struct adp8870_bl *data; 850 struct adp8870_backlight_platform_data *pdata = 851 dev_get_platdata(&client->dev); 852 uint8_t reg_val; 853 int ret; 854 855 if (!i2c_check_functionality(client->adapter, 856 I2C_FUNC_SMBUS_BYTE_DATA)) { 857 dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); 858 return -EIO; 859 } 860 861 if (!pdata) { 862 dev_err(&client->dev, "no platform data?\n"); 863 return -EINVAL; 864 } 865 866 ret = adp8870_read(client, ADP8870_MFDVID, ®_val); 867 if (ret < 0) 868 return -EIO; 869 870 if (ADP8870_MANID(reg_val) != ADP8870_MANUFID) { 871 dev_err(&client->dev, "failed to probe\n"); 872 return -ENODEV; 873 } 874 875 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 876 if (data == NULL) 877 return -ENOMEM; 878 879 data->revid = ADP8870_DEVID(reg_val); 880 data->client = client; 881 data->pdata = pdata; 882 data->id = id->driver_data; 883 data->current_brightness = 0; 884 i2c_set_clientdata(client, data); 885 886 mutex_init(&data->lock); 887 888 memset(&props, 0, sizeof(props)); 889 props.type = BACKLIGHT_RAW; 890 props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS; 891 bl = devm_backlight_device_register(&client->dev, 892 dev_driver_string(&client->dev), 893 &client->dev, data, &adp8870_bl_ops, &props); 894 if (IS_ERR(bl)) { 895 dev_err(&client->dev, "failed to register backlight\n"); 896 return PTR_ERR(bl); 897 } 898 899 data->bl = bl; 900 901 if (pdata->en_ambl_sens) { 902 ret = sysfs_create_group(&bl->dev.kobj, 903 &adp8870_bl_attr_group); 904 if (ret) { 905 dev_err(&client->dev, "failed to register sysfs\n"); 906 return ret; 907 } 908 } 909 910 ret = adp8870_bl_setup(bl); 911 if (ret) { 912 ret = -EIO; 913 goto out; 914 } 915 916 backlight_update_status(bl); 917 918 dev_info(&client->dev, "Rev.%d Backlight\n", data->revid); 919 920 if (pdata->num_leds) 921 adp8870_led_probe(client); 922 923 return 0; 924 925 out: 926 if (data->pdata->en_ambl_sens) 927 sysfs_remove_group(&data->bl->dev.kobj, 928 &adp8870_bl_attr_group); 929 930 return ret; 931 } 932 933 static int adp8870_remove(struct i2c_client *client) 934 { 935 struct adp8870_bl *data = i2c_get_clientdata(client); 936 937 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY); 938 939 if (data->led) 940 adp8870_led_remove(client); 941 942 if (data->pdata->en_ambl_sens) 943 sysfs_remove_group(&data->bl->dev.kobj, 944 &adp8870_bl_attr_group); 945 946 return 0; 947 } 948 949 #ifdef CONFIG_PM_SLEEP 950 static int adp8870_i2c_suspend(struct device *dev) 951 { 952 struct i2c_client *client = to_i2c_client(dev); 953 954 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY); 955 956 return 0; 957 } 958 959 static int adp8870_i2c_resume(struct device *dev) 960 { 961 struct i2c_client *client = to_i2c_client(dev); 962 963 adp8870_set_bits(client, ADP8870_MDCR, NSTBY | BLEN); 964 965 return 0; 966 } 967 #endif 968 969 static SIMPLE_DEV_PM_OPS(adp8870_i2c_pm_ops, adp8870_i2c_suspend, 970 adp8870_i2c_resume); 971 972 static const struct i2c_device_id adp8870_id[] = { 973 { "adp8870", 0 }, 974 { } 975 }; 976 MODULE_DEVICE_TABLE(i2c, adp8870_id); 977 978 static struct i2c_driver adp8870_driver = { 979 .driver = { 980 .name = KBUILD_MODNAME, 981 .pm = &adp8870_i2c_pm_ops, 982 }, 983 .probe = adp8870_probe, 984 .remove = adp8870_remove, 985 .id_table = adp8870_id, 986 }; 987 988 module_i2c_driver(adp8870_driver); 989 990 MODULE_LICENSE("GPL v2"); 991 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 992 MODULE_DESCRIPTION("ADP8870 Backlight driver"); 993 MODULE_ALIAS("i2c:adp8870-backlight"); 994