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/version.h> 11 #include <linux/init.h> 12 #include <linux/errno.h> 13 #include <linux/pm.h> 14 #include <linux/platform_device.h> 15 #include <linux/i2c.h> 16 #include <linux/fb.h> 17 #include <linux/backlight.h> 18 #include <linux/leds.h> 19 #include <linux/workqueue.h> 20 #include <linux/slab.h> 21 22 #include <linux/i2c/adp8870.h> 23 #define ADP8870_EXT_FEATURES 24 #define ADP8870_USE_LEDS 25 26 27 #define ADP8870_MFDVID 0x00 /* Manufacturer and device ID */ 28 #define ADP8870_MDCR 0x01 /* Device mode and status */ 29 #define ADP8870_INT_STAT 0x02 /* Interrupts status */ 30 #define ADP8870_INT_EN 0x03 /* Interrupts enable */ 31 #define ADP8870_CFGR 0x04 /* Configuration register */ 32 #define ADP8870_BLSEL 0x05 /* Sink enable backlight or independent */ 33 #define ADP8870_PWMLED 0x06 /* PWM Enable Selection Register */ 34 #define ADP8870_BLOFF 0x07 /* Backlight off timeout */ 35 #define ADP8870_BLDIM 0x08 /* Backlight dim timeout */ 36 #define ADP8870_BLFR 0x09 /* Backlight fade in and out rates */ 37 #define ADP8870_BLMX1 0x0A /* Backlight (Brightness Level 1-daylight) maximum current */ 38 #define ADP8870_BLDM1 0x0B /* Backlight (Brightness Level 1-daylight) dim current */ 39 #define ADP8870_BLMX2 0x0C /* Backlight (Brightness Level 2-bright) maximum current */ 40 #define ADP8870_BLDM2 0x0D /* Backlight (Brightness Level 2-bright) dim current */ 41 #define ADP8870_BLMX3 0x0E /* Backlight (Brightness Level 3-office) maximum current */ 42 #define ADP8870_BLDM3 0x0F /* Backlight (Brightness Level 3-office) dim current */ 43 #define ADP8870_BLMX4 0x10 /* Backlight (Brightness Level 4-indoor) maximum current */ 44 #define ADP8870_BLDM4 0x11 /* Backlight (Brightness Level 4-indoor) dim current */ 45 #define ADP8870_BLMX5 0x12 /* Backlight (Brightness Level 5-dark) maximum current */ 46 #define ADP8870_BLDM5 0x13 /* Backlight (Brightness Level 5-dark) dim current */ 47 #define ADP8870_ISCLAW 0x1A /* Independent sink current fade law register */ 48 #define ADP8870_ISCC 0x1B /* Independent sink current control register */ 49 #define ADP8870_ISCT1 0x1C /* Independent Sink Current Timer Register LED[7:5] */ 50 #define ADP8870_ISCT2 0x1D /* Independent Sink Current Timer Register LED[4:1] */ 51 #define ADP8870_ISCF 0x1E /* Independent sink current fade register */ 52 #define ADP8870_ISC1 0x1F /* Independent Sink Current LED1 */ 53 #define ADP8870_ISC2 0x20 /* Independent Sink Current LED2 */ 54 #define ADP8870_ISC3 0x21 /* Independent Sink Current LED3 */ 55 #define ADP8870_ISC4 0x22 /* Independent Sink Current LED4 */ 56 #define ADP8870_ISC5 0x23 /* Independent Sink Current LED5 */ 57 #define ADP8870_ISC6 0x24 /* Independent Sink Current LED6 */ 58 #define ADP8870_ISC7 0x25 /* Independent Sink Current LED7 (Brightness Level 1-daylight) */ 59 #define ADP8870_ISC7_L2 0x26 /* Independent Sink Current LED7 (Brightness Level 2-bright) */ 60 #define ADP8870_ISC7_L3 0x27 /* Independent Sink Current LED7 (Brightness Level 3-office) */ 61 #define ADP8870_ISC7_L4 0x28 /* Independent Sink Current LED7 (Brightness Level 4-indoor) */ 62 #define ADP8870_ISC7_L5 0x29 /* Independent Sink Current LED7 (Brightness Level 5-dark) */ 63 #define ADP8870_CMP_CTL 0x2D /* ALS Comparator Control Register */ 64 #define ADP8870_ALS1_EN 0x2E /* Main ALS comparator level enable */ 65 #define ADP8870_ALS2_EN 0x2F /* Second ALS comparator level enable */ 66 #define ADP8870_ALS1_STAT 0x30 /* Main ALS Comparator Status Register */ 67 #define ADP8870_ALS2_STAT 0x31 /* Second ALS Comparator Status Register */ 68 #define ADP8870_L2TRP 0x32 /* L2 comparator reference */ 69 #define ADP8870_L2HYS 0x33 /* L2 hysteresis */ 70 #define ADP8870_L3TRP 0x34 /* L3 comparator reference */ 71 #define ADP8870_L3HYS 0x35 /* L3 hysteresis */ 72 #define ADP8870_L4TRP 0x36 /* L4 comparator reference */ 73 #define ADP8870_L4HYS 0x37 /* L4 hysteresis */ 74 #define ADP8870_L5TRP 0x38 /* L5 comparator reference */ 75 #define ADP8870_L5HYS 0x39 /* L5 hysteresis */ 76 #define ADP8870_PH1LEVL 0x40 /* First phototransistor ambient light level-low byte register */ 77 #define ADP8870_PH1LEVH 0x41 /* First phototransistor ambient light level-high byte register */ 78 #define ADP8870_PH2LEVL 0x42 /* Second phototransistor ambient light level-low byte register */ 79 #define ADP8870_PH2LEVH 0x43 /* Second phototransistor ambient light level-high byte register */ 80 81 #define ADP8870_MANUFID 0x3 /* Analog Devices AD8870 Manufacturer and device ID */ 82 #define ADP8870_DEVID(x) ((x) & 0xF) 83 #define ADP8870_MANID(x) ((x) >> 4) 84 85 /* MDCR Device mode and status */ 86 #define D7ALSEN (1 << 7) 87 #define INT_CFG (1 << 6) 88 #define NSTBY (1 << 5) 89 #define DIM_EN (1 << 4) 90 #define GDWN_DIS (1 << 3) 91 #define SIS_EN (1 << 2) 92 #define CMP_AUTOEN (1 << 1) 93 #define BLEN (1 << 0) 94 95 /* ADP8870_ALS1_EN Main ALS comparator level enable */ 96 #define L5_EN (1 << 3) 97 #define L4_EN (1 << 2) 98 #define L3_EN (1 << 1) 99 #define L2_EN (1 << 0) 100 101 #define CFGR_BLV_SHIFT 3 102 #define CFGR_BLV_MASK 0x7 103 #define ADP8870_FLAG_LED_MASK 0xFF 104 105 #define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4)) 106 #define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1)) 107 #define ALS_CMPR_CFG_VAL(filt) ((0x7 & (filt)) << 1) 108 109 struct adp8870_bl { 110 struct i2c_client *client; 111 struct backlight_device *bl; 112 struct adp8870_led *led; 113 struct adp8870_backlight_platform_data *pdata; 114 struct mutex lock; 115 unsigned long cached_daylight_max; 116 int id; 117 int revid; 118 int current_brightness; 119 }; 120 121 struct adp8870_led { 122 struct led_classdev cdev; 123 struct work_struct work; 124 struct i2c_client *client; 125 enum led_brightness new_brightness; 126 int id; 127 int flags; 128 }; 129 130 static int adp8870_read(struct i2c_client *client, int reg, uint8_t *val) 131 { 132 int ret; 133 134 ret = i2c_smbus_read_byte_data(client, reg); 135 if (ret < 0) { 136 dev_err(&client->dev, "failed reading at 0x%02x\n", reg); 137 return ret; 138 } 139 140 *val = ret; 141 return 0; 142 } 143 144 145 static int adp8870_write(struct i2c_client *client, u8 reg, u8 val) 146 { 147 int ret = i2c_smbus_write_byte_data(client, reg, val); 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) == 0)) { 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 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 __devinit adp8870_led_probe(struct i2c_client *client) 240 { 241 struct adp8870_backlight_platform_data *pdata = 242 client->dev.platform_data; 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; 247 248 249 led = kcalloc(pdata->num_leds, sizeof(*led), GFP_KERNEL); 250 if (led == NULL) { 251 dev_err(&client->dev, "failed to alloc memory\n"); 252 return -ENOMEM; 253 } 254 255 ret = adp8870_write(client, ADP8870_ISCLAW, pdata->led_fade_law); 256 if (ret) 257 goto err_free; 258 259 ret = adp8870_write(client, ADP8870_ISCT1, 260 (pdata->led_on_time & 0x3) << 6); 261 if (ret) 262 goto err_free; 263 264 ret = adp8870_write(client, ADP8870_ISCF, 265 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out)); 266 if (ret) 267 goto err_free; 268 269 for (i = 0; i < pdata->num_leds; ++i) { 270 cur_led = &pdata->leds[i]; 271 led_dat = &led[i]; 272 273 led_dat->id = cur_led->flags & ADP8870_FLAG_LED_MASK; 274 275 if (led_dat->id > 7 || led_dat->id < 1) { 276 dev_err(&client->dev, "Invalid LED ID %d\n", 277 led_dat->id); 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 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 err_free: 322 kfree(led); 323 324 return ret; 325 } 326 327 static int __devexit adp8870_led_remove(struct i2c_client *client) 328 { 329 struct adp8870_backlight_platform_data *pdata = 330 client->dev.platform_data; 331 struct adp8870_bl *data = i2c_get_clientdata(client); 332 int i; 333 334 for (i = 0; i < pdata->num_leds; i++) { 335 led_classdev_unregister(&data->led[i].cdev); 336 cancel_work_sync(&data->led[i].work); 337 } 338 339 kfree(data->led); 340 return 0; 341 } 342 #else 343 static int __devinit adp8870_led_probe(struct i2c_client *client) 344 { 345 return 0; 346 } 347 348 static int __devexit adp8870_led_remove(struct i2c_client *client) 349 { 350 return 0; 351 } 352 #endif 353 354 static int adp8870_bl_set(struct backlight_device *bl, int brightness) 355 { 356 struct adp8870_bl *data = bl_get_data(bl); 357 struct i2c_client *client = data->client; 358 int ret = 0; 359 360 if (data->pdata->en_ambl_sens) { 361 if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) { 362 /* Disable Ambient Light auto adjust */ 363 ret = adp8870_clr_bits(client, ADP8870_MDCR, 364 CMP_AUTOEN); 365 if (ret) 366 return ret; 367 ret = adp8870_write(client, ADP8870_BLMX1, brightness); 368 if (ret) 369 return ret; 370 } else { 371 /* 372 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust 373 * restore daylight l1 sysfs brightness 374 */ 375 ret = adp8870_write(client, ADP8870_BLMX1, 376 data->cached_daylight_max); 377 if (ret) 378 return ret; 379 380 ret = adp8870_set_bits(client, ADP8870_MDCR, 381 CMP_AUTOEN); 382 if (ret) 383 return ret; 384 } 385 } else { 386 ret = adp8870_write(client, ADP8870_BLMX1, brightness); 387 if (ret) 388 return ret; 389 } 390 391 if (data->current_brightness && brightness == 0) 392 ret = adp8870_set_bits(client, 393 ADP8870_MDCR, DIM_EN); 394 else if (data->current_brightness == 0 && brightness) 395 ret = adp8870_clr_bits(client, 396 ADP8870_MDCR, DIM_EN); 397 398 if (!ret) 399 data->current_brightness = brightness; 400 401 return ret; 402 } 403 404 static int adp8870_bl_update_status(struct backlight_device *bl) 405 { 406 int brightness = bl->props.brightness; 407 if (bl->props.power != FB_BLANK_UNBLANK) 408 brightness = 0; 409 410 if (bl->props.fb_blank != FB_BLANK_UNBLANK) 411 brightness = 0; 412 413 return adp8870_bl_set(bl, brightness); 414 } 415 416 static int adp8870_bl_get_brightness(struct backlight_device *bl) 417 { 418 struct adp8870_bl *data = bl_get_data(bl); 419 420 return data->current_brightness; 421 } 422 423 static const struct backlight_ops adp8870_bl_ops = { 424 .update_status = adp8870_bl_update_status, 425 .get_brightness = adp8870_bl_get_brightness, 426 }; 427 428 static int adp8870_bl_setup(struct backlight_device *bl) 429 { 430 struct adp8870_bl *data = bl_get_data(bl); 431 struct i2c_client *client = data->client; 432 struct adp8870_backlight_platform_data *pdata = data->pdata; 433 int ret = 0; 434 435 ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign); 436 if (ret) 437 return ret; 438 439 ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign); 440 if (ret) 441 return ret; 442 443 ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max); 444 if (ret) 445 return ret; 446 447 ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim); 448 if (ret) 449 return ret; 450 451 if (pdata->en_ambl_sens) { 452 data->cached_daylight_max = pdata->l1_daylight_max; 453 ret = adp8870_write(client, ADP8870_BLMX2, 454 pdata->l2_bright_max); 455 if (ret) 456 return ret; 457 ret = adp8870_write(client, ADP8870_BLDM2, 458 pdata->l2_bright_dim); 459 if (ret) 460 return ret; 461 462 ret = adp8870_write(client, ADP8870_BLMX3, 463 pdata->l3_office_max); 464 if (ret) 465 return ret; 466 ret = adp8870_write(client, ADP8870_BLDM3, 467 pdata->l3_office_dim); 468 if (ret) 469 return ret; 470 471 ret = adp8870_write(client, ADP8870_BLMX4, 472 pdata->l4_indoor_max); 473 if (ret) 474 return ret; 475 476 ret = adp8870_write(client, ADP8870_BLDM4, 477 pdata->l4_indor_dim); 478 if (ret) 479 return ret; 480 481 ret = adp8870_write(client, ADP8870_BLMX5, 482 pdata->l5_dark_max); 483 if (ret) 484 return ret; 485 486 ret = adp8870_write(client, ADP8870_BLDM5, 487 pdata->l5_dark_dim); 488 if (ret) 489 return ret; 490 491 ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip); 492 if (ret) 493 return ret; 494 495 ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst); 496 if (ret) 497 return ret; 498 499 ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip); 500 if (ret) 501 return ret; 502 503 ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst); 504 if (ret) 505 return ret; 506 507 ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip); 508 if (ret) 509 return ret; 510 511 ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst); 512 if (ret) 513 return ret; 514 515 ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip); 516 if (ret) 517 return ret; 518 519 ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst); 520 if (ret) 521 return ret; 522 523 ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN | 524 L3_EN | L2_EN); 525 if (ret) 526 return ret; 527 528 ret = adp8870_write(client, ADP8870_CMP_CTL, 529 ALS_CMPR_CFG_VAL(pdata->abml_filt)); 530 if (ret) 531 return ret; 532 } 533 534 ret = adp8870_write(client, ADP8870_CFGR, 535 BL_CFGR_VAL(pdata->bl_fade_law, 0)); 536 if (ret) 537 return ret; 538 539 ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in, 540 pdata->bl_fade_out)); 541 if (ret) 542 return ret; 543 /* 544 * ADP8870 Rev0 requires GDWN_DIS bit set 545 */ 546 547 ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY | 548 (data->revid == 0 ? GDWN_DIS : 0)); 549 550 return ret; 551 } 552 553 static ssize_t adp8870_show(struct device *dev, char *buf, int reg) 554 { 555 struct adp8870_bl *data = dev_get_drvdata(dev); 556 int error; 557 uint8_t reg_val; 558 559 mutex_lock(&data->lock); 560 error = adp8870_read(data->client, reg, ®_val); 561 mutex_unlock(&data->lock); 562 563 if (error < 0) 564 return error; 565 566 return sprintf(buf, "%u\n", reg_val); 567 } 568 569 static ssize_t adp8870_store(struct device *dev, const char *buf, 570 size_t count, int reg) 571 { 572 struct adp8870_bl *data = dev_get_drvdata(dev); 573 unsigned long val; 574 int ret; 575 576 ret = strict_strtoul(buf, 10, &val); 577 if (ret) 578 return ret; 579 580 mutex_lock(&data->lock); 581 adp8870_write(data->client, reg, val); 582 mutex_unlock(&data->lock); 583 584 return count; 585 } 586 587 static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev, 588 struct device_attribute *attr, char *buf) 589 { 590 return adp8870_show(dev, buf, ADP8870_BLMX5); 591 } 592 593 static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev, 594 struct device_attribute *attr, const char *buf, size_t count) 595 { 596 return adp8870_store(dev, buf, count, ADP8870_BLMX5); 597 } 598 static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show, 599 adp8870_bl_l5_dark_max_store); 600 601 602 static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev, 603 struct device_attribute *attr, char *buf) 604 { 605 return adp8870_show(dev, buf, ADP8870_BLMX4); 606 } 607 608 static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev, 609 struct device_attribute *attr, const char *buf, size_t count) 610 { 611 return adp8870_store(dev, buf, count, ADP8870_BLMX4); 612 } 613 static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show, 614 adp8870_bl_l4_indoor_max_store); 615 616 617 static ssize_t adp8870_bl_l3_office_max_show(struct device *dev, 618 struct device_attribute *attr, char *buf) 619 { 620 return adp8870_show(dev, buf, ADP8870_BLMX3); 621 } 622 623 static ssize_t adp8870_bl_l3_office_max_store(struct device *dev, 624 struct device_attribute *attr, const char *buf, size_t count) 625 { 626 return adp8870_store(dev, buf, count, ADP8870_BLMX3); 627 } 628 629 static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show, 630 adp8870_bl_l3_office_max_store); 631 632 static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev, 633 struct device_attribute *attr, char *buf) 634 { 635 return adp8870_show(dev, buf, ADP8870_BLMX2); 636 } 637 638 static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev, 639 struct device_attribute *attr, const char *buf, size_t count) 640 { 641 return adp8870_store(dev, buf, count, ADP8870_BLMX2); 642 } 643 static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show, 644 adp8870_bl_l2_bright_max_store); 645 646 static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev, 647 struct device_attribute *attr, char *buf) 648 { 649 return adp8870_show(dev, buf, ADP8870_BLMX1); 650 } 651 652 static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev, 653 struct device_attribute *attr, const char *buf, size_t count) 654 { 655 struct adp8870_bl *data = dev_get_drvdata(dev); 656 int ret = strict_strtoul(buf, 10, &data->cached_daylight_max); 657 if (ret) 658 return ret; 659 660 return adp8870_store(dev, buf, count, ADP8870_BLMX1); 661 } 662 static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show, 663 adp8870_bl_l1_daylight_max_store); 664 665 static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev, 666 struct device_attribute *attr, char *buf) 667 { 668 return adp8870_show(dev, buf, ADP8870_BLDM5); 669 } 670 671 static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev, 672 struct device_attribute *attr, 673 const char *buf, size_t count) 674 { 675 return adp8870_store(dev, buf, count, ADP8870_BLDM5); 676 } 677 static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show, 678 adp8870_bl_l5_dark_dim_store); 679 680 static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev, 681 struct device_attribute *attr, char *buf) 682 { 683 return adp8870_show(dev, buf, ADP8870_BLDM4); 684 } 685 686 static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev, 687 struct device_attribute *attr, 688 const char *buf, size_t count) 689 { 690 return adp8870_store(dev, buf, count, ADP8870_BLDM4); 691 } 692 static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show, 693 adp8870_bl_l4_indoor_dim_store); 694 695 696 static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev, 697 struct device_attribute *attr, char *buf) 698 { 699 return adp8870_show(dev, buf, ADP8870_BLDM3); 700 } 701 702 static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev, 703 struct device_attribute *attr, 704 const char *buf, size_t count) 705 { 706 return adp8870_store(dev, buf, count, ADP8870_BLDM3); 707 } 708 static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show, 709 adp8870_bl_l3_office_dim_store); 710 711 static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev, 712 struct device_attribute *attr, char *buf) 713 { 714 return adp8870_show(dev, buf, ADP8870_BLDM2); 715 } 716 717 static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev, 718 struct device_attribute *attr, 719 const char *buf, size_t count) 720 { 721 return adp8870_store(dev, buf, count, ADP8870_BLDM2); 722 } 723 static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show, 724 adp8870_bl_l2_bright_dim_store); 725 726 static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev, 727 struct device_attribute *attr, char *buf) 728 { 729 return adp8870_show(dev, buf, ADP8870_BLDM1); 730 } 731 732 static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev, 733 struct device_attribute *attr, 734 const char *buf, size_t count) 735 { 736 return adp8870_store(dev, buf, count, ADP8870_BLDM1); 737 } 738 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show, 739 adp8870_bl_l1_daylight_dim_store); 740 741 #ifdef ADP8870_EXT_FEATURES 742 static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev, 743 struct device_attribute *attr, char *buf) 744 { 745 struct adp8870_bl *data = dev_get_drvdata(dev); 746 int error; 747 uint8_t reg_val; 748 uint16_t ret_val; 749 750 mutex_lock(&data->lock); 751 error = adp8870_read(data->client, ADP8870_PH1LEVL, ®_val); 752 if (error < 0) { 753 mutex_unlock(&data->lock); 754 return error; 755 } 756 ret_val = reg_val; 757 error = adp8870_read(data->client, ADP8870_PH1LEVH, ®_val); 758 mutex_unlock(&data->lock); 759 760 if (error < 0) 761 return error; 762 763 /* Return 13-bit conversion value for the first light sensor */ 764 ret_val += (reg_val & 0x1F) << 8; 765 766 return sprintf(buf, "%u\n", ret_val); 767 } 768 static DEVICE_ATTR(ambient_light_level, 0444, 769 adp8870_bl_ambient_light_level_show, NULL); 770 771 static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev, 772 struct device_attribute *attr, char *buf) 773 { 774 struct adp8870_bl *data = dev_get_drvdata(dev); 775 int error; 776 uint8_t reg_val; 777 778 mutex_lock(&data->lock); 779 error = adp8870_read(data->client, ADP8870_CFGR, ®_val); 780 mutex_unlock(&data->lock); 781 782 if (error < 0) 783 return error; 784 785 return sprintf(buf, "%u\n", 786 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1); 787 } 788 789 static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev, 790 struct device_attribute *attr, 791 const char *buf, size_t count) 792 { 793 struct adp8870_bl *data = dev_get_drvdata(dev); 794 unsigned long val; 795 uint8_t reg_val; 796 int ret; 797 798 ret = strict_strtoul(buf, 10, &val); 799 if (ret) 800 return ret; 801 802 if (val == 0) { 803 /* Enable automatic ambient light sensing */ 804 adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN); 805 } else if ((val > 0) && (val < 6)) { 806 /* Disable automatic ambient light sensing */ 807 adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN); 808 809 /* Set user supplied ambient light zone */ 810 mutex_lock(&data->lock); 811 adp8870_read(data->client, ADP8870_CFGR, ®_val); 812 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 813 reg_val |= (val - 1) << CFGR_BLV_SHIFT; 814 adp8870_write(data->client, ADP8870_CFGR, reg_val); 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 __devinit 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 client->dev.platform_data; 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 = kzalloc(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.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 i2c_set_clientdata(client, NULL); 935 kfree(data); 936 937 return ret; 938 } 939 940 static int __devexit adp8870_remove(struct i2c_client *client) 941 { 942 struct adp8870_bl *data = i2c_get_clientdata(client); 943 944 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY); 945 946 if (data->led) 947 adp8870_led_remove(client); 948 949 if (data->pdata->en_ambl_sens) 950 sysfs_remove_group(&data->bl->dev.kobj, 951 &adp8870_bl_attr_group); 952 953 backlight_device_unregister(data->bl); 954 i2c_set_clientdata(client, NULL); 955 kfree(data); 956 957 return 0; 958 } 959 960 #ifdef CONFIG_PM 961 static int adp8870_i2c_suspend(struct i2c_client *client, pm_message_t message) 962 { 963 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY); 964 965 return 0; 966 } 967 968 static int adp8870_i2c_resume(struct i2c_client *client) 969 { 970 adp8870_set_bits(client, ADP8870_MDCR, NSTBY); 971 972 return 0; 973 } 974 #else 975 #define adp8870_i2c_suspend NULL 976 #define adp8870_i2c_resume NULL 977 #endif 978 979 static const struct i2c_device_id adp8870_id[] = { 980 { "adp8870", 0 }, 981 { } 982 }; 983 MODULE_DEVICE_TABLE(i2c, adp8870_id); 984 985 static struct i2c_driver adp8870_driver = { 986 .driver = { 987 .name = KBUILD_MODNAME, 988 }, 989 .probe = adp8870_probe, 990 .remove = __devexit_p(adp8870_remove), 991 .suspend = adp8870_i2c_suspend, 992 .resume = adp8870_i2c_resume, 993 .id_table = adp8870_id, 994 }; 995 996 static int __init adp8870_init(void) 997 { 998 return i2c_add_driver(&adp8870_driver); 999 } 1000 module_init(adp8870_init); 1001 1002 static void __exit adp8870_exit(void) 1003 { 1004 i2c_del_driver(&adp8870_driver); 1005 } 1006 module_exit(adp8870_exit); 1007 1008 MODULE_LICENSE("GPL v2"); 1009 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 1010 MODULE_DESCRIPTION("ADP8870 Backlight driver"); 1011 MODULE_ALIAS("platform:adp8870-backlight"); 1012