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) == 0)) { 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 __devinit adp8870_led_probe(struct i2c_client *client) 239 { 240 struct adp8870_backlight_platform_data *pdata = 241 client->dev.platform_data; 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; 246 247 248 led = kcalloc(pdata->num_leds, sizeof(*led), 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 goto err_free; 257 258 ret = adp8870_write(client, ADP8870_ISCT1, 259 (pdata->led_on_time & 0x3) << 6); 260 if (ret) 261 goto err_free; 262 263 ret = adp8870_write(client, ADP8870_ISCF, 264 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out)); 265 if (ret) 266 goto err_free; 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 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 goto err; 284 } 285 286 led_dat->cdev.name = cur_led->name; 287 led_dat->cdev.default_trigger = cur_led->default_trigger; 288 led_dat->cdev.brightness_set = adp8870_led_set; 289 led_dat->cdev.brightness = LED_OFF; 290 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT; 291 led_dat->client = client; 292 led_dat->new_brightness = LED_OFF; 293 INIT_WORK(&led_dat->work, adp8870_led_work); 294 295 ret = led_classdev_register(&client->dev, &led_dat->cdev); 296 if (ret) { 297 dev_err(&client->dev, "failed to register LED %d\n", 298 led_dat->id); 299 goto err; 300 } 301 302 ret = adp8870_led_setup(led_dat); 303 if (ret) { 304 dev_err(&client->dev, "failed to write\n"); 305 i++; 306 goto err; 307 } 308 } 309 310 data->led = led; 311 312 return 0; 313 314 err: 315 for (i = i - 1; i >= 0; --i) { 316 led_classdev_unregister(&led[i].cdev); 317 cancel_work_sync(&led[i].work); 318 } 319 320 err_free: 321 kfree(led); 322 323 return ret; 324 } 325 326 static int __devexit adp8870_led_remove(struct i2c_client *client) 327 { 328 struct adp8870_backlight_platform_data *pdata = 329 client->dev.platform_data; 330 struct adp8870_bl *data = i2c_get_clientdata(client); 331 int i; 332 333 for (i = 0; i < pdata->num_leds; i++) { 334 led_classdev_unregister(&data->led[i].cdev); 335 cancel_work_sync(&data->led[i].work); 336 } 337 338 kfree(data->led); 339 return 0; 340 } 341 #else 342 static int __devinit adp8870_led_probe(struct i2c_client *client) 343 { 344 return 0; 345 } 346 347 static int __devexit adp8870_led_remove(struct i2c_client *client) 348 { 349 return 0; 350 } 351 #endif 352 353 static int adp8870_bl_set(struct backlight_device *bl, int brightness) 354 { 355 struct adp8870_bl *data = bl_get_data(bl); 356 struct i2c_client *client = data->client; 357 int ret = 0; 358 359 if (data->pdata->en_ambl_sens) { 360 if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) { 361 /* Disable Ambient Light auto adjust */ 362 ret = adp8870_clr_bits(client, ADP8870_MDCR, 363 CMP_AUTOEN); 364 if (ret) 365 return ret; 366 ret = adp8870_write(client, ADP8870_BLMX1, brightness); 367 if (ret) 368 return ret; 369 } else { 370 /* 371 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust 372 * restore daylight l1 sysfs brightness 373 */ 374 ret = adp8870_write(client, ADP8870_BLMX1, 375 data->cached_daylight_max); 376 if (ret) 377 return ret; 378 379 ret = adp8870_set_bits(client, ADP8870_MDCR, 380 CMP_AUTOEN); 381 if (ret) 382 return ret; 383 } 384 } else { 385 ret = adp8870_write(client, ADP8870_BLMX1, brightness); 386 if (ret) 387 return ret; 388 } 389 390 if (data->current_brightness && brightness == 0) 391 ret = adp8870_set_bits(client, 392 ADP8870_MDCR, DIM_EN); 393 else if (data->current_brightness == 0 && brightness) 394 ret = adp8870_clr_bits(client, 395 ADP8870_MDCR, DIM_EN); 396 397 if (!ret) 398 data->current_brightness = brightness; 399 400 return ret; 401 } 402 403 static int adp8870_bl_update_status(struct backlight_device *bl) 404 { 405 int brightness = bl->props.brightness; 406 if (bl->props.power != FB_BLANK_UNBLANK) 407 brightness = 0; 408 409 if (bl->props.fb_blank != FB_BLANK_UNBLANK) 410 brightness = 0; 411 412 return adp8870_bl_set(bl, brightness); 413 } 414 415 static int adp8870_bl_get_brightness(struct backlight_device *bl) 416 { 417 struct adp8870_bl *data = bl_get_data(bl); 418 419 return data->current_brightness; 420 } 421 422 static const struct backlight_ops adp8870_bl_ops = { 423 .update_status = adp8870_bl_update_status, 424 .get_brightness = adp8870_bl_get_brightness, 425 }; 426 427 static int adp8870_bl_setup(struct backlight_device *bl) 428 { 429 struct adp8870_bl *data = bl_get_data(bl); 430 struct i2c_client *client = data->client; 431 struct adp8870_backlight_platform_data *pdata = data->pdata; 432 int ret = 0; 433 434 ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign); 435 if (ret) 436 return ret; 437 438 ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign); 439 if (ret) 440 return ret; 441 442 ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max); 443 if (ret) 444 return ret; 445 446 ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim); 447 if (ret) 448 return ret; 449 450 if (pdata->en_ambl_sens) { 451 data->cached_daylight_max = pdata->l1_daylight_max; 452 ret = adp8870_write(client, ADP8870_BLMX2, 453 pdata->l2_bright_max); 454 if (ret) 455 return ret; 456 ret = adp8870_write(client, ADP8870_BLDM2, 457 pdata->l2_bright_dim); 458 if (ret) 459 return ret; 460 461 ret = adp8870_write(client, ADP8870_BLMX3, 462 pdata->l3_office_max); 463 if (ret) 464 return ret; 465 ret = adp8870_write(client, ADP8870_BLDM3, 466 pdata->l3_office_dim); 467 if (ret) 468 return ret; 469 470 ret = adp8870_write(client, ADP8870_BLMX4, 471 pdata->l4_indoor_max); 472 if (ret) 473 return ret; 474 475 ret = adp8870_write(client, ADP8870_BLDM4, 476 pdata->l4_indor_dim); 477 if (ret) 478 return ret; 479 480 ret = adp8870_write(client, ADP8870_BLMX5, 481 pdata->l5_dark_max); 482 if (ret) 483 return ret; 484 485 ret = adp8870_write(client, ADP8870_BLDM5, 486 pdata->l5_dark_dim); 487 if (ret) 488 return ret; 489 490 ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip); 491 if (ret) 492 return ret; 493 494 ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst); 495 if (ret) 496 return ret; 497 498 ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip); 499 if (ret) 500 return ret; 501 502 ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst); 503 if (ret) 504 return ret; 505 506 ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip); 507 if (ret) 508 return ret; 509 510 ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst); 511 if (ret) 512 return ret; 513 514 ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip); 515 if (ret) 516 return ret; 517 518 ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst); 519 if (ret) 520 return ret; 521 522 ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN | 523 L3_EN | L2_EN); 524 if (ret) 525 return ret; 526 527 ret = adp8870_write(client, ADP8870_CMP_CTL, 528 ALS_CMPR_CFG_VAL(pdata->abml_filt)); 529 if (ret) 530 return ret; 531 } 532 533 ret = adp8870_write(client, ADP8870_CFGR, 534 BL_CFGR_VAL(pdata->bl_fade_law, 0)); 535 if (ret) 536 return ret; 537 538 ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in, 539 pdata->bl_fade_out)); 540 if (ret) 541 return ret; 542 /* 543 * ADP8870 Rev0 requires GDWN_DIS bit set 544 */ 545 546 ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY | 547 (data->revid == 0 ? GDWN_DIS : 0)); 548 549 return ret; 550 } 551 552 static ssize_t adp8870_show(struct device *dev, char *buf, int reg) 553 { 554 struct adp8870_bl *data = dev_get_drvdata(dev); 555 int error; 556 uint8_t reg_val; 557 558 mutex_lock(&data->lock); 559 error = adp8870_read(data->client, reg, ®_val); 560 mutex_unlock(&data->lock); 561 562 if (error < 0) 563 return error; 564 565 return sprintf(buf, "%u\n", reg_val); 566 } 567 568 static ssize_t adp8870_store(struct device *dev, const char *buf, 569 size_t count, int reg) 570 { 571 struct adp8870_bl *data = dev_get_drvdata(dev); 572 unsigned long val; 573 int ret; 574 575 ret = strict_strtoul(buf, 10, &val); 576 if (ret) 577 return ret; 578 579 mutex_lock(&data->lock); 580 adp8870_write(data->client, reg, val); 581 mutex_unlock(&data->lock); 582 583 return count; 584 } 585 586 static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev, 587 struct device_attribute *attr, char *buf) 588 { 589 return adp8870_show(dev, buf, ADP8870_BLMX5); 590 } 591 592 static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev, 593 struct device_attribute *attr, const char *buf, size_t count) 594 { 595 return adp8870_store(dev, buf, count, ADP8870_BLMX5); 596 } 597 static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show, 598 adp8870_bl_l5_dark_max_store); 599 600 601 static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev, 602 struct device_attribute *attr, char *buf) 603 { 604 return adp8870_show(dev, buf, ADP8870_BLMX4); 605 } 606 607 static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev, 608 struct device_attribute *attr, const char *buf, size_t count) 609 { 610 return adp8870_store(dev, buf, count, ADP8870_BLMX4); 611 } 612 static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show, 613 adp8870_bl_l4_indoor_max_store); 614 615 616 static ssize_t adp8870_bl_l3_office_max_show(struct device *dev, 617 struct device_attribute *attr, char *buf) 618 { 619 return adp8870_show(dev, buf, ADP8870_BLMX3); 620 } 621 622 static ssize_t adp8870_bl_l3_office_max_store(struct device *dev, 623 struct device_attribute *attr, const char *buf, size_t count) 624 { 625 return adp8870_store(dev, buf, count, ADP8870_BLMX3); 626 } 627 628 static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show, 629 adp8870_bl_l3_office_max_store); 630 631 static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev, 632 struct device_attribute *attr, char *buf) 633 { 634 return adp8870_show(dev, buf, ADP8870_BLMX2); 635 } 636 637 static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev, 638 struct device_attribute *attr, const char *buf, size_t count) 639 { 640 return adp8870_store(dev, buf, count, ADP8870_BLMX2); 641 } 642 static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show, 643 adp8870_bl_l2_bright_max_store); 644 645 static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev, 646 struct device_attribute *attr, char *buf) 647 { 648 return adp8870_show(dev, buf, ADP8870_BLMX1); 649 } 650 651 static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev, 652 struct device_attribute *attr, const char *buf, size_t count) 653 { 654 struct adp8870_bl *data = dev_get_drvdata(dev); 655 int ret = strict_strtoul(buf, 10, &data->cached_daylight_max); 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 = strict_strtoul(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 __devinit 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 client->dev.platform_data; 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 = kzalloc(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 = backlight_device_register(dev_driver_string(&client->dev), 894 &client->dev, data, &adp8870_bl_ops, &props); 895 if (IS_ERR(bl)) { 896 dev_err(&client->dev, "failed to register backlight\n"); 897 ret = PTR_ERR(bl); 898 goto out2; 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); 906 907 if (ret) { 908 dev_err(&client->dev, "failed to register sysfs\n"); 909 goto out1; 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 out1: 932 backlight_device_unregister(bl); 933 out2: 934 kfree(data); 935 936 return ret; 937 } 938 939 static int __devexit adp8870_remove(struct i2c_client *client) 940 { 941 struct adp8870_bl *data = i2c_get_clientdata(client); 942 943 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY); 944 945 if (data->led) 946 adp8870_led_remove(client); 947 948 if (data->pdata->en_ambl_sens) 949 sysfs_remove_group(&data->bl->dev.kobj, 950 &adp8870_bl_attr_group); 951 952 backlight_device_unregister(data->bl); 953 kfree(data); 954 955 return 0; 956 } 957 958 #ifdef CONFIG_PM 959 static int adp8870_i2c_suspend(struct i2c_client *client, pm_message_t message) 960 { 961 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY); 962 963 return 0; 964 } 965 966 static int adp8870_i2c_resume(struct i2c_client *client) 967 { 968 adp8870_set_bits(client, ADP8870_MDCR, NSTBY); 969 970 return 0; 971 } 972 #else 973 #define adp8870_i2c_suspend NULL 974 #define adp8870_i2c_resume NULL 975 #endif 976 977 static const struct i2c_device_id adp8870_id[] = { 978 { "adp8870", 0 }, 979 { } 980 }; 981 MODULE_DEVICE_TABLE(i2c, adp8870_id); 982 983 static struct i2c_driver adp8870_driver = { 984 .driver = { 985 .name = KBUILD_MODNAME, 986 }, 987 .probe = adp8870_probe, 988 .remove = __devexit_p(adp8870_remove), 989 .suspend = adp8870_i2c_suspend, 990 .resume = adp8870_i2c_resume, 991 .id_table = adp8870_id, 992 }; 993 994 static int __init adp8870_init(void) 995 { 996 return i2c_add_driver(&adp8870_driver); 997 } 998 module_init(adp8870_init); 999 1000 static void __exit adp8870_exit(void) 1001 { 1002 i2c_del_driver(&adp8870_driver); 1003 } 1004 module_exit(adp8870_exit); 1005 1006 MODULE_LICENSE("GPL v2"); 1007 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 1008 MODULE_DESCRIPTION("ADP8870 Backlight driver"); 1009 MODULE_ALIAS("i2c:adp8870-backlight"); 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