1 /* 2 * Backlight driver for Analog Devices ADP8860 Backlight Devices 3 * 4 * Copyright 2009-2010 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/slab.h> 19 #include <linux/workqueue.h> 20 21 #include <linux/i2c/adp8860.h> 22 #define ADP8860_EXT_FEATURES 23 #define ADP8860_USE_LEDS 24 25 #define ADP8860_MFDVID 0x00 /* Manufacturer and device ID */ 26 #define ADP8860_MDCR 0x01 /* Device mode and status */ 27 #define ADP8860_MDCR2 0x02 /* Device mode and Status Register 2 */ 28 #define ADP8860_INTR_EN 0x03 /* Interrupts enable */ 29 #define ADP8860_CFGR 0x04 /* Configuration register */ 30 #define ADP8860_BLSEN 0x05 /* Sink enable backlight or independent */ 31 #define ADP8860_BLOFF 0x06 /* Backlight off timeout */ 32 #define ADP8860_BLDIM 0x07 /* Backlight dim timeout */ 33 #define ADP8860_BLFR 0x08 /* Backlight fade in and out rates */ 34 #define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */ 35 #define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */ 36 #define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */ 37 #define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */ 38 #define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */ 39 #define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */ 40 #define ADP8860_ISCFR 0x0F /* Independent sink current fade control register */ 41 #define ADP8860_ISCC 0x10 /* Independent sink current control register */ 42 #define ADP8860_ISCT1 0x11 /* Independent Sink Current Timer Register LED[7:5] */ 43 #define ADP8860_ISCT2 0x12 /* Independent Sink Current Timer Register LED[4:1] */ 44 #define ADP8860_ISCF 0x13 /* Independent sink current fade register */ 45 #define ADP8860_ISC7 0x14 /* Independent Sink Current LED7 */ 46 #define ADP8860_ISC6 0x15 /* Independent Sink Current LED6 */ 47 #define ADP8860_ISC5 0x16 /* Independent Sink Current LED5 */ 48 #define ADP8860_ISC4 0x17 /* Independent Sink Current LED4 */ 49 #define ADP8860_ISC3 0x18 /* Independent Sink Current LED3 */ 50 #define ADP8860_ISC2 0x19 /* Independent Sink Current LED2 */ 51 #define ADP8860_ISC1 0x1A /* Independent Sink Current LED1 */ 52 #define ADP8860_CCFG 0x1B /* Comparator configuration */ 53 #define ADP8860_CCFG2 0x1C /* Second comparator configuration */ 54 #define ADP8860_L2_TRP 0x1D /* L2 comparator reference */ 55 #define ADP8860_L2_HYS 0x1E /* L2 hysteresis */ 56 #define ADP8860_L3_TRP 0x1F /* L3 comparator reference */ 57 #define ADP8860_L3_HYS 0x20 /* L3 hysteresis */ 58 #define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */ 59 #define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */ 60 #define ADP8860_PH2LEVL 0x23 /* Second phototransistor ambient light level-low byte register */ 61 #define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */ 62 63 #define ADP8860_MANUFID 0x0 /* Analog Devices ADP8860 Manufacturer ID */ 64 #define ADP8861_MANUFID 0x4 /* Analog Devices ADP8861 Manufacturer ID */ 65 #define ADP8863_MANUFID 0x2 /* Analog Devices ADP8863 Manufacturer ID */ 66 67 #define ADP8860_DEVID(x) ((x) & 0xF) 68 #define ADP8860_MANID(x) ((x) >> 4) 69 70 /* MDCR Device mode and status */ 71 #define INT_CFG (1 << 6) 72 #define NSTBY (1 << 5) 73 #define DIM_EN (1 << 4) 74 #define GDWN_DIS (1 << 3) 75 #define SIS_EN (1 << 2) 76 #define CMP_AUTOEN (1 << 1) 77 #define BLEN (1 << 0) 78 79 /* ADP8860_CCFG Main ALS comparator level enable */ 80 #define L3_EN (1 << 1) 81 #define L2_EN (1 << 0) 82 83 #define CFGR_BLV_SHIFT 3 84 #define CFGR_BLV_MASK 0x3 85 #define ADP8860_FLAG_LED_MASK 0xFF 86 87 #define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4)) 88 #define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1)) 89 #define ALS_CCFG_VAL(filt) ((0x7 & filt) << 5) 90 91 enum { 92 adp8860, 93 adp8861, 94 adp8863 95 }; 96 97 struct adp8860_led { 98 struct led_classdev cdev; 99 struct work_struct work; 100 struct i2c_client *client; 101 enum led_brightness new_brightness; 102 int id; 103 int flags; 104 }; 105 106 struct adp8860_bl { 107 struct i2c_client *client; 108 struct backlight_device *bl; 109 struct adp8860_led *led; 110 struct adp8860_backlight_platform_data *pdata; 111 struct mutex lock; 112 unsigned long cached_daylight_max; 113 int id; 114 int revid; 115 int current_brightness; 116 unsigned en_ambl_sens:1; 117 unsigned gdwn_dis:1; 118 }; 119 120 static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val) 121 { 122 int ret; 123 124 ret = i2c_smbus_read_byte_data(client, reg); 125 if (ret < 0) { 126 dev_err(&client->dev, "failed reading at 0x%02x\n", reg); 127 return ret; 128 } 129 130 *val = (uint8_t)ret; 131 return 0; 132 } 133 134 static int adp8860_write(struct i2c_client *client, u8 reg, u8 val) 135 { 136 return i2c_smbus_write_byte_data(client, reg, val); 137 } 138 139 static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask) 140 { 141 struct adp8860_bl *data = i2c_get_clientdata(client); 142 uint8_t reg_val; 143 int ret; 144 145 mutex_lock(&data->lock); 146 147 ret = adp8860_read(client, reg, ®_val); 148 149 if (!ret && ((reg_val & bit_mask) != bit_mask)) { 150 reg_val |= bit_mask; 151 ret = adp8860_write(client, reg, reg_val); 152 } 153 154 mutex_unlock(&data->lock); 155 return ret; 156 } 157 158 static int adp8860_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask) 159 { 160 struct adp8860_bl *data = i2c_get_clientdata(client); 161 uint8_t reg_val; 162 int ret; 163 164 mutex_lock(&data->lock); 165 166 ret = adp8860_read(client, reg, ®_val); 167 168 if (!ret && (reg_val & bit_mask)) { 169 reg_val &= ~bit_mask; 170 ret = adp8860_write(client, reg, reg_val); 171 } 172 173 mutex_unlock(&data->lock); 174 return ret; 175 } 176 177 /* 178 * Independent sink / LED 179 */ 180 #if defined(ADP8860_USE_LEDS) 181 static void adp8860_led_work(struct work_struct *work) 182 { 183 struct adp8860_led *led = container_of(work, struct adp8860_led, work); 184 adp8860_write(led->client, ADP8860_ISC1 - led->id + 1, 185 led->new_brightness >> 1); 186 } 187 188 static void adp8860_led_set(struct led_classdev *led_cdev, 189 enum led_brightness value) 190 { 191 struct adp8860_led *led; 192 193 led = container_of(led_cdev, struct adp8860_led, cdev); 194 led->new_brightness = value; 195 schedule_work(&led->work); 196 } 197 198 static int adp8860_led_setup(struct adp8860_led *led) 199 { 200 struct i2c_client *client = led->client; 201 int ret = 0; 202 203 ret = adp8860_write(client, ADP8860_ISC1 - led->id + 1, 0); 204 ret |= adp8860_set_bits(client, ADP8860_ISCC, 1 << (led->id - 1)); 205 206 if (led->id > 4) 207 ret |= adp8860_set_bits(client, ADP8860_ISCT1, 208 (led->flags & 0x3) << ((led->id - 5) * 2)); 209 else 210 ret |= adp8860_set_bits(client, ADP8860_ISCT2, 211 (led->flags & 0x3) << ((led->id - 1) * 2)); 212 213 return ret; 214 } 215 216 static int __devinit adp8860_led_probe(struct i2c_client *client) 217 { 218 struct adp8860_backlight_platform_data *pdata = 219 client->dev.platform_data; 220 struct adp8860_bl *data = i2c_get_clientdata(client); 221 struct adp8860_led *led, *led_dat; 222 struct led_info *cur_led; 223 int ret, i; 224 225 led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL); 226 if (led == NULL) { 227 dev_err(&client->dev, "failed to alloc memory\n"); 228 return -ENOMEM; 229 } 230 231 ret = adp8860_write(client, ADP8860_ISCFR, pdata->led_fade_law); 232 ret = adp8860_write(client, ADP8860_ISCT1, 233 (pdata->led_on_time & 0x3) << 6); 234 ret |= adp8860_write(client, ADP8860_ISCF, 235 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out)); 236 237 if (ret) { 238 dev_err(&client->dev, "failed to write\n"); 239 goto err_free; 240 } 241 242 for (i = 0; i < pdata->num_leds; ++i) { 243 cur_led = &pdata->leds[i]; 244 led_dat = &led[i]; 245 246 led_dat->id = cur_led->flags & ADP8860_FLAG_LED_MASK; 247 248 if (led_dat->id > 7 || led_dat->id < 1) { 249 dev_err(&client->dev, "Invalid LED ID %d\n", 250 led_dat->id); 251 goto err; 252 } 253 254 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) { 255 dev_err(&client->dev, "LED %d used by Backlight\n", 256 led_dat->id); 257 goto err; 258 } 259 260 led_dat->cdev.name = cur_led->name; 261 led_dat->cdev.default_trigger = cur_led->default_trigger; 262 led_dat->cdev.brightness_set = adp8860_led_set; 263 led_dat->cdev.brightness = LED_OFF; 264 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT; 265 led_dat->client = client; 266 led_dat->new_brightness = LED_OFF; 267 INIT_WORK(&led_dat->work, adp8860_led_work); 268 269 ret = led_classdev_register(&client->dev, &led_dat->cdev); 270 if (ret) { 271 dev_err(&client->dev, "failed to register LED %d\n", 272 led_dat->id); 273 goto err; 274 } 275 276 ret = adp8860_led_setup(led_dat); 277 if (ret) { 278 dev_err(&client->dev, "failed to write\n"); 279 i++; 280 goto err; 281 } 282 } 283 284 data->led = led; 285 286 return 0; 287 288 err: 289 for (i = i - 1; i >= 0; --i) { 290 led_classdev_unregister(&led[i].cdev); 291 cancel_work_sync(&led[i].work); 292 } 293 294 err_free: 295 kfree(led); 296 297 return ret; 298 } 299 300 static int __devexit adp8860_led_remove(struct i2c_client *client) 301 { 302 struct adp8860_backlight_platform_data *pdata = 303 client->dev.platform_data; 304 struct adp8860_bl *data = i2c_get_clientdata(client); 305 int i; 306 307 for (i = 0; i < pdata->num_leds; i++) { 308 led_classdev_unregister(&data->led[i].cdev); 309 cancel_work_sync(&data->led[i].work); 310 } 311 312 kfree(data->led); 313 return 0; 314 } 315 #else 316 static int __devinit adp8860_led_probe(struct i2c_client *client) 317 { 318 return 0; 319 } 320 321 static int __devexit adp8860_led_remove(struct i2c_client *client) 322 { 323 return 0; 324 } 325 #endif 326 327 static int adp8860_bl_set(struct backlight_device *bl, int brightness) 328 { 329 struct adp8860_bl *data = bl_get_data(bl); 330 struct i2c_client *client = data->client; 331 int ret = 0; 332 333 if (data->en_ambl_sens) { 334 if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) { 335 /* Disable Ambient Light auto adjust */ 336 ret |= adp8860_clr_bits(client, ADP8860_MDCR, 337 CMP_AUTOEN); 338 ret |= adp8860_write(client, ADP8860_BLMX1, brightness); 339 } else { 340 /* 341 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust 342 * restore daylight l1 sysfs brightness 343 */ 344 ret |= adp8860_write(client, ADP8860_BLMX1, 345 data->cached_daylight_max); 346 ret |= adp8860_set_bits(client, ADP8860_MDCR, 347 CMP_AUTOEN); 348 } 349 } else 350 ret |= adp8860_write(client, ADP8860_BLMX1, brightness); 351 352 if (data->current_brightness && brightness == 0) 353 ret |= adp8860_set_bits(client, 354 ADP8860_MDCR, DIM_EN); 355 else if (data->current_brightness == 0 && brightness) 356 ret |= adp8860_clr_bits(client, 357 ADP8860_MDCR, DIM_EN); 358 359 if (!ret) 360 data->current_brightness = brightness; 361 362 return ret; 363 } 364 365 static int adp8860_bl_update_status(struct backlight_device *bl) 366 { 367 int brightness = bl->props.brightness; 368 if (bl->props.power != FB_BLANK_UNBLANK) 369 brightness = 0; 370 371 if (bl->props.fb_blank != FB_BLANK_UNBLANK) 372 brightness = 0; 373 374 return adp8860_bl_set(bl, brightness); 375 } 376 377 static int adp8860_bl_get_brightness(struct backlight_device *bl) 378 { 379 struct adp8860_bl *data = bl_get_data(bl); 380 381 return data->current_brightness; 382 } 383 384 static const struct backlight_ops adp8860_bl_ops = { 385 .update_status = adp8860_bl_update_status, 386 .get_brightness = adp8860_bl_get_brightness, 387 }; 388 389 static int adp8860_bl_setup(struct backlight_device *bl) 390 { 391 struct adp8860_bl *data = bl_get_data(bl); 392 struct i2c_client *client = data->client; 393 struct adp8860_backlight_platform_data *pdata = data->pdata; 394 int ret = 0; 395 396 ret |= adp8860_write(client, ADP8860_BLSEN, ~pdata->bl_led_assign); 397 ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max); 398 ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim); 399 400 if (data->en_ambl_sens) { 401 data->cached_daylight_max = pdata->l1_daylight_max; 402 ret |= adp8860_write(client, ADP8860_BLMX2, 403 pdata->l2_office_max); 404 ret |= adp8860_write(client, ADP8860_BLDM2, 405 pdata->l2_office_dim); 406 ret |= adp8860_write(client, ADP8860_BLMX3, 407 pdata->l3_dark_max); 408 ret |= adp8860_write(client, ADP8860_BLDM3, 409 pdata->l3_dark_dim); 410 411 ret |= adp8860_write(client, ADP8860_L2_TRP, pdata->l2_trip); 412 ret |= adp8860_write(client, ADP8860_L2_HYS, pdata->l2_hyst); 413 ret |= adp8860_write(client, ADP8860_L3_TRP, pdata->l3_trip); 414 ret |= adp8860_write(client, ADP8860_L3_HYS, pdata->l3_hyst); 415 ret |= adp8860_write(client, ADP8860_CCFG, L2_EN | L3_EN | 416 ALS_CCFG_VAL(pdata->abml_filt)); 417 } 418 419 ret |= adp8860_write(client, ADP8860_CFGR, 420 BL_CFGR_VAL(pdata->bl_fade_law, 0)); 421 422 ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in, 423 pdata->bl_fade_out)); 424 425 ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY | 426 (data->gdwn_dis ? GDWN_DIS : 0)); 427 428 return ret; 429 } 430 431 static ssize_t adp8860_show(struct device *dev, char *buf, int reg) 432 { 433 struct adp8860_bl *data = dev_get_drvdata(dev); 434 int error; 435 uint8_t reg_val; 436 437 mutex_lock(&data->lock); 438 error = adp8860_read(data->client, reg, ®_val); 439 mutex_unlock(&data->lock); 440 441 if (error < 0) 442 return error; 443 444 return sprintf(buf, "%u\n", reg_val); 445 } 446 447 static ssize_t adp8860_store(struct device *dev, const char *buf, 448 size_t count, int reg) 449 { 450 struct adp8860_bl *data = dev_get_drvdata(dev); 451 unsigned long val; 452 int ret; 453 454 ret = strict_strtoul(buf, 10, &val); 455 if (ret) 456 return ret; 457 458 mutex_lock(&data->lock); 459 adp8860_write(data->client, reg, val); 460 mutex_unlock(&data->lock); 461 462 return count; 463 } 464 465 static ssize_t adp8860_bl_l3_dark_max_show(struct device *dev, 466 struct device_attribute *attr, char *buf) 467 { 468 return adp8860_show(dev, buf, ADP8860_BLMX3); 469 } 470 471 static ssize_t adp8860_bl_l3_dark_max_store(struct device *dev, 472 struct device_attribute *attr, const char *buf, size_t count) 473 { 474 return adp8860_store(dev, buf, count, ADP8860_BLMX3); 475 } 476 477 static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show, 478 adp8860_bl_l3_dark_max_store); 479 480 static ssize_t adp8860_bl_l2_office_max_show(struct device *dev, 481 struct device_attribute *attr, char *buf) 482 { 483 return adp8860_show(dev, buf, ADP8860_BLMX2); 484 } 485 486 static ssize_t adp8860_bl_l2_office_max_store(struct device *dev, 487 struct device_attribute *attr, const char *buf, size_t count) 488 { 489 return adp8860_store(dev, buf, count, ADP8860_BLMX2); 490 } 491 static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show, 492 adp8860_bl_l2_office_max_store); 493 494 static ssize_t adp8860_bl_l1_daylight_max_show(struct device *dev, 495 struct device_attribute *attr, char *buf) 496 { 497 return adp8860_show(dev, buf, ADP8860_BLMX1); 498 } 499 500 static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev, 501 struct device_attribute *attr, const char *buf, size_t count) 502 { 503 struct adp8860_bl *data = dev_get_drvdata(dev); 504 int ret = strict_strtoul(buf, 10, &data->cached_daylight_max); 505 if (ret) 506 return ret; 507 508 return adp8860_store(dev, buf, count, ADP8860_BLMX1); 509 } 510 static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show, 511 adp8860_bl_l1_daylight_max_store); 512 513 static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev, 514 struct device_attribute *attr, char *buf) 515 { 516 return adp8860_show(dev, buf, ADP8860_BLDM3); 517 } 518 519 static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev, 520 struct device_attribute *attr, 521 const char *buf, size_t count) 522 { 523 return adp8860_store(dev, buf, count, ADP8860_BLDM3); 524 } 525 static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show, 526 adp8860_bl_l3_dark_dim_store); 527 528 static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev, 529 struct device_attribute *attr, char *buf) 530 { 531 return adp8860_show(dev, buf, ADP8860_BLDM2); 532 } 533 534 static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev, 535 struct device_attribute *attr, 536 const char *buf, size_t count) 537 { 538 return adp8860_store(dev, buf, count, ADP8860_BLDM2); 539 } 540 static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show, 541 adp8860_bl_l2_office_dim_store); 542 543 static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev, 544 struct device_attribute *attr, char *buf) 545 { 546 return adp8860_show(dev, buf, ADP8860_BLDM1); 547 } 548 549 static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev, 550 struct device_attribute *attr, 551 const char *buf, size_t count) 552 { 553 return adp8860_store(dev, buf, count, ADP8860_BLDM1); 554 } 555 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show, 556 adp8860_bl_l1_daylight_dim_store); 557 558 #ifdef ADP8860_EXT_FEATURES 559 static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev, 560 struct device_attribute *attr, char *buf) 561 { 562 struct adp8860_bl *data = dev_get_drvdata(dev); 563 int error; 564 uint8_t reg_val; 565 uint16_t ret_val; 566 567 mutex_lock(&data->lock); 568 error = adp8860_read(data->client, ADP8860_PH1LEVL, ®_val); 569 ret_val = reg_val; 570 error |= adp8860_read(data->client, ADP8860_PH1LEVH, ®_val); 571 mutex_unlock(&data->lock); 572 573 if (error < 0) 574 return error; 575 576 /* Return 13-bit conversion value for the first light sensor */ 577 ret_val += (reg_val & 0x1F) << 8; 578 579 return sprintf(buf, "%u\n", ret_val); 580 } 581 static DEVICE_ATTR(ambient_light_level, 0444, 582 adp8860_bl_ambient_light_level_show, NULL); 583 584 static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev, 585 struct device_attribute *attr, char *buf) 586 { 587 struct adp8860_bl *data = dev_get_drvdata(dev); 588 int error; 589 uint8_t reg_val; 590 591 mutex_lock(&data->lock); 592 error = adp8860_read(data->client, ADP8860_CFGR, ®_val); 593 mutex_unlock(&data->lock); 594 595 if (error < 0) 596 return error; 597 598 return sprintf(buf, "%u\n", 599 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1); 600 } 601 602 static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev, 603 struct device_attribute *attr, 604 const char *buf, size_t count) 605 { 606 struct adp8860_bl *data = dev_get_drvdata(dev); 607 unsigned long val; 608 uint8_t reg_val; 609 int ret; 610 611 ret = strict_strtoul(buf, 10, &val); 612 if (ret) 613 return ret; 614 615 if (val == 0) { 616 /* Enable automatic ambient light sensing */ 617 adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 618 } else if ((val > 0) && (val <= 3)) { 619 /* Disable automatic ambient light sensing */ 620 adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 621 622 /* Set user supplied ambient light zone */ 623 mutex_lock(&data->lock); 624 adp8860_read(data->client, ADP8860_CFGR, ®_val); 625 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 626 reg_val |= (val - 1) << CFGR_BLV_SHIFT; 627 adp8860_write(data->client, ADP8860_CFGR, reg_val); 628 mutex_unlock(&data->lock); 629 } 630 631 return count; 632 } 633 static DEVICE_ATTR(ambient_light_zone, 0664, 634 adp8860_bl_ambient_light_zone_show, 635 adp8860_bl_ambient_light_zone_store); 636 #endif 637 638 static struct attribute *adp8860_bl_attributes[] = { 639 &dev_attr_l3_dark_max.attr, 640 &dev_attr_l3_dark_dim.attr, 641 &dev_attr_l2_office_max.attr, 642 &dev_attr_l2_office_dim.attr, 643 &dev_attr_l1_daylight_max.attr, 644 &dev_attr_l1_daylight_dim.attr, 645 #ifdef ADP8860_EXT_FEATURES 646 &dev_attr_ambient_light_level.attr, 647 &dev_attr_ambient_light_zone.attr, 648 #endif 649 NULL 650 }; 651 652 static const struct attribute_group adp8860_bl_attr_group = { 653 .attrs = adp8860_bl_attributes, 654 }; 655 656 static int __devinit adp8860_probe(struct i2c_client *client, 657 const struct i2c_device_id *id) 658 { 659 struct backlight_device *bl; 660 struct adp8860_bl *data; 661 struct adp8860_backlight_platform_data *pdata = 662 client->dev.platform_data; 663 struct backlight_properties props; 664 uint8_t reg_val; 665 int ret; 666 667 if (!i2c_check_functionality(client->adapter, 668 I2C_FUNC_SMBUS_BYTE_DATA)) { 669 dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); 670 return -EIO; 671 } 672 673 if (!pdata) { 674 dev_err(&client->dev, "no platform data?\n"); 675 return -EINVAL; 676 } 677 678 data = kzalloc(sizeof(*data), GFP_KERNEL); 679 if (data == NULL) 680 return -ENOMEM; 681 682 ret = adp8860_read(client, ADP8860_MFDVID, ®_val); 683 if (ret < 0) 684 goto out2; 685 686 switch (ADP8860_MANID(reg_val)) { 687 case ADP8863_MANUFID: 688 data->gdwn_dis = !!pdata->gdwn_dis; 689 case ADP8860_MANUFID: 690 data->en_ambl_sens = !!pdata->en_ambl_sens; 691 break; 692 case ADP8861_MANUFID: 693 data->gdwn_dis = !!pdata->gdwn_dis; 694 break; 695 default: 696 dev_err(&client->dev, "failed to probe\n"); 697 ret = -ENODEV; 698 goto out2; 699 } 700 701 /* It's confirmed that the DEVID field is actually a REVID */ 702 703 data->revid = ADP8860_DEVID(reg_val); 704 data->client = client; 705 data->pdata = pdata; 706 data->id = id->driver_data; 707 data->current_brightness = 0; 708 i2c_set_clientdata(client, data); 709 710 memset(&props, 0, sizeof(props)); 711 props.type = BACKLIGHT_RAW; 712 props.max_brightness = ADP8860_MAX_BRIGHTNESS; 713 714 mutex_init(&data->lock); 715 716 bl = backlight_device_register(dev_driver_string(&client->dev), 717 &client->dev, data, &adp8860_bl_ops, &props); 718 if (IS_ERR(bl)) { 719 dev_err(&client->dev, "failed to register backlight\n"); 720 ret = PTR_ERR(bl); 721 goto out2; 722 } 723 724 bl->props.brightness = ADP8860_MAX_BRIGHTNESS; 725 726 data->bl = bl; 727 728 if (data->en_ambl_sens) 729 ret = sysfs_create_group(&bl->dev.kobj, 730 &adp8860_bl_attr_group); 731 732 if (ret) { 733 dev_err(&client->dev, "failed to register sysfs\n"); 734 goto out1; 735 } 736 737 ret = adp8860_bl_setup(bl); 738 if (ret) { 739 ret = -EIO; 740 goto out; 741 } 742 743 backlight_update_status(bl); 744 745 dev_info(&client->dev, "%s Rev.%d Backlight\n", 746 client->name, data->revid); 747 748 if (pdata->num_leds) 749 adp8860_led_probe(client); 750 751 return 0; 752 753 out: 754 if (data->en_ambl_sens) 755 sysfs_remove_group(&data->bl->dev.kobj, 756 &adp8860_bl_attr_group); 757 out1: 758 backlight_device_unregister(bl); 759 out2: 760 kfree(data); 761 762 return ret; 763 } 764 765 static int __devexit adp8860_remove(struct i2c_client *client) 766 { 767 struct adp8860_bl *data = i2c_get_clientdata(client); 768 769 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 770 771 if (data->led) 772 adp8860_led_remove(client); 773 774 if (data->en_ambl_sens) 775 sysfs_remove_group(&data->bl->dev.kobj, 776 &adp8860_bl_attr_group); 777 778 backlight_device_unregister(data->bl); 779 kfree(data); 780 781 return 0; 782 } 783 784 #ifdef CONFIG_PM 785 static int adp8860_i2c_suspend(struct i2c_client *client, pm_message_t message) 786 { 787 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 788 789 return 0; 790 } 791 792 static int adp8860_i2c_resume(struct i2c_client *client) 793 { 794 adp8860_set_bits(client, ADP8860_MDCR, NSTBY); 795 796 return 0; 797 } 798 #else 799 #define adp8860_i2c_suspend NULL 800 #define adp8860_i2c_resume NULL 801 #endif 802 803 static const struct i2c_device_id adp8860_id[] = { 804 { "adp8860", adp8860 }, 805 { "adp8861", adp8861 }, 806 { "adp8863", adp8863 }, 807 { } 808 }; 809 MODULE_DEVICE_TABLE(i2c, adp8860_id); 810 811 static struct i2c_driver adp8860_driver = { 812 .driver = { 813 .name = KBUILD_MODNAME, 814 }, 815 .probe = adp8860_probe, 816 .remove = __devexit_p(adp8860_remove), 817 .suspend = adp8860_i2c_suspend, 818 .resume = adp8860_i2c_resume, 819 .id_table = adp8860_id, 820 }; 821 822 module_i2c_driver(adp8860_driver); 823 824 MODULE_LICENSE("GPL v2"); 825 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 826 MODULE_DESCRIPTION("ADP8860 Backlight driver"); 827 MODULE_ALIAS("i2c:adp8860-backlight"); 828