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/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/slab.h> 20 #include <linux/workqueue.h> 21 22 #include <linux/i2c/adp8860.h> 23 #define ADP8860_EXT_FEATURES 24 #define ADP8860_USE_LEDS 25 26 #define ADP8860_MFDVID 0x00 /* Manufacturer and device ID */ 27 #define ADP8860_MDCR 0x01 /* Device mode and status */ 28 #define ADP8860_MDCR2 0x02 /* Device mode and Status Register 2 */ 29 #define ADP8860_INTR_EN 0x03 /* Interrupts enable */ 30 #define ADP8860_CFGR 0x04 /* Configuration register */ 31 #define ADP8860_BLSEN 0x05 /* Sink enable backlight or independent */ 32 #define ADP8860_BLOFF 0x06 /* Backlight off timeout */ 33 #define ADP8860_BLDIM 0x07 /* Backlight dim timeout */ 34 #define ADP8860_BLFR 0x08 /* Backlight fade in and out rates */ 35 #define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */ 36 #define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */ 37 #define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */ 38 #define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */ 39 #define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */ 40 #define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */ 41 #define ADP8860_ISCFR 0x0F /* Independent sink current fade control register */ 42 #define ADP8860_ISCC 0x10 /* Independent sink current control register */ 43 #define ADP8860_ISCT1 0x11 /* Independent Sink Current Timer Register LED[7:5] */ 44 #define ADP8860_ISCT2 0x12 /* Independent Sink Current Timer Register LED[4:1] */ 45 #define ADP8860_ISCF 0x13 /* Independent sink current fade register */ 46 #define ADP8860_ISC7 0x14 /* Independent Sink Current LED7 */ 47 #define ADP8860_ISC6 0x15 /* Independent Sink Current LED6 */ 48 #define ADP8860_ISC5 0x16 /* Independent Sink Current LED5 */ 49 #define ADP8860_ISC4 0x17 /* Independent Sink Current LED4 */ 50 #define ADP8860_ISC3 0x18 /* Independent Sink Current LED3 */ 51 #define ADP8860_ISC2 0x19 /* Independent Sink Current LED2 */ 52 #define ADP8860_ISC1 0x1A /* Independent Sink Current LED1 */ 53 #define ADP8860_CCFG 0x1B /* Comparator configuration */ 54 #define ADP8860_CCFG2 0x1C /* Second comparator configuration */ 55 #define ADP8860_L2_TRP 0x1D /* L2 comparator reference */ 56 #define ADP8860_L2_HYS 0x1E /* L2 hysteresis */ 57 #define ADP8860_L3_TRP 0x1F /* L3 comparator reference */ 58 #define ADP8860_L3_HYS 0x20 /* L3 hysteresis */ 59 #define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */ 60 #define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */ 61 #define ADP8860_PH2LEVL 0x23 /* Second phototransistor ambient light level-low byte register */ 62 #define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */ 63 64 #define ADP8860_MANUFID 0x0 /* Analog Devices ADP8860 Manufacturer ID */ 65 #define ADP8861_MANUFID 0x4 /* Analog Devices ADP8861 Manufacturer ID */ 66 #define ADP8863_MANUFID 0x2 /* Analog Devices ADP8863 Manufacturer ID */ 67 68 #define ADP8860_DEVID(x) ((x) & 0xF) 69 #define ADP8860_MANID(x) ((x) >> 4) 70 71 /* MDCR Device mode and status */ 72 #define INT_CFG (1 << 6) 73 #define NSTBY (1 << 5) 74 #define DIM_EN (1 << 4) 75 #define GDWN_DIS (1 << 3) 76 #define SIS_EN (1 << 2) 77 #define CMP_AUTOEN (1 << 1) 78 #define BLEN (1 << 0) 79 80 /* ADP8860_CCFG Main ALS comparator level enable */ 81 #define L3_EN (1 << 1) 82 #define L2_EN (1 << 0) 83 84 #define CFGR_BLV_SHIFT 3 85 #define CFGR_BLV_MASK 0x3 86 #define ADP8860_FLAG_LED_MASK 0xFF 87 88 #define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4)) 89 #define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1)) 90 #define ALS_CCFG_VAL(filt) ((0x7 & filt) << 5) 91 92 enum { 93 adp8860, 94 adp8861, 95 adp8863 96 }; 97 98 struct adp8860_led { 99 struct led_classdev cdev; 100 struct work_struct work; 101 struct i2c_client *client; 102 enum led_brightness new_brightness; 103 int id; 104 int flags; 105 }; 106 107 struct adp8860_bl { 108 struct i2c_client *client; 109 struct backlight_device *bl; 110 struct adp8860_led *led; 111 struct adp8860_backlight_platform_data *pdata; 112 struct mutex lock; 113 unsigned long cached_daylight_max; 114 int id; 115 int revid; 116 int current_brightness; 117 unsigned en_ambl_sens:1; 118 unsigned gdwn_dis:1; 119 }; 120 121 static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val) 122 { 123 int ret; 124 125 ret = i2c_smbus_read_byte_data(client, reg); 126 if (ret < 0) { 127 dev_err(&client->dev, "failed reading at 0x%02x\n", reg); 128 return ret; 129 } 130 131 *val = (uint8_t)ret; 132 return 0; 133 } 134 135 static int adp8860_write(struct i2c_client *client, u8 reg, u8 val) 136 { 137 return i2c_smbus_write_byte_data(client, reg, val); 138 } 139 140 static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask) 141 { 142 struct adp8860_bl *data = i2c_get_clientdata(client); 143 uint8_t reg_val; 144 int ret; 145 146 mutex_lock(&data->lock); 147 148 ret = adp8860_read(client, reg, ®_val); 149 150 if (!ret && ((reg_val & bit_mask) == 0)) { 151 reg_val |= bit_mask; 152 ret = adp8860_write(client, reg, reg_val); 153 } 154 155 mutex_unlock(&data->lock); 156 return ret; 157 } 158 159 static int adp8860_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask) 160 { 161 struct adp8860_bl *data = i2c_get_clientdata(client); 162 uint8_t reg_val; 163 int ret; 164 165 mutex_lock(&data->lock); 166 167 ret = adp8860_read(client, reg, ®_val); 168 169 if (!ret && (reg_val & bit_mask)) { 170 reg_val &= ~bit_mask; 171 ret = adp8860_write(client, reg, reg_val); 172 } 173 174 mutex_unlock(&data->lock); 175 return ret; 176 } 177 178 /* 179 * Independent sink / LED 180 */ 181 #if defined(ADP8860_USE_LEDS) 182 static void adp8860_led_work(struct work_struct *work) 183 { 184 struct adp8860_led *led = container_of(work, struct adp8860_led, work); 185 adp8860_write(led->client, ADP8860_ISC1 - led->id + 1, 186 led->new_brightness >> 1); 187 } 188 189 static void adp8860_led_set(struct led_classdev *led_cdev, 190 enum led_brightness value) 191 { 192 struct adp8860_led *led; 193 194 led = container_of(led_cdev, struct adp8860_led, cdev); 195 led->new_brightness = value; 196 schedule_work(&led->work); 197 } 198 199 static int adp8860_led_setup(struct adp8860_led *led) 200 { 201 struct i2c_client *client = led->client; 202 int ret = 0; 203 204 ret = adp8860_write(client, ADP8860_ISC1 - led->id + 1, 0); 205 ret |= adp8860_set_bits(client, ADP8860_ISCC, 1 << (led->id - 1)); 206 207 if (led->id > 4) 208 ret |= adp8860_set_bits(client, ADP8860_ISCT1, 209 (led->flags & 0x3) << ((led->id - 5) * 2)); 210 else 211 ret |= adp8860_set_bits(client, ADP8860_ISCT2, 212 (led->flags & 0x3) << ((led->id - 1) * 2)); 213 214 return ret; 215 } 216 217 static int __devinit adp8860_led_probe(struct i2c_client *client) 218 { 219 struct adp8860_backlight_platform_data *pdata = 220 client->dev.platform_data; 221 struct adp8860_bl *data = i2c_get_clientdata(client); 222 struct adp8860_led *led, *led_dat; 223 struct led_info *cur_led; 224 int ret, i; 225 226 led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL); 227 if (led == NULL) { 228 dev_err(&client->dev, "failed to alloc memory\n"); 229 return -ENOMEM; 230 } 231 232 ret = adp8860_write(client, ADP8860_ISCFR, pdata->led_fade_law); 233 ret = adp8860_write(client, ADP8860_ISCT1, 234 (pdata->led_on_time & 0x3) << 6); 235 ret |= adp8860_write(client, ADP8860_ISCF, 236 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out)); 237 238 if (ret) { 239 dev_err(&client->dev, "failed to write\n"); 240 goto err_free; 241 } 242 243 for (i = 0; i < pdata->num_leds; ++i) { 244 cur_led = &pdata->leds[i]; 245 led_dat = &led[i]; 246 247 led_dat->id = cur_led->flags & ADP8860_FLAG_LED_MASK; 248 249 if (led_dat->id > 7 || led_dat->id < 1) { 250 dev_err(&client->dev, "Invalid LED ID %d\n", 251 led_dat->id); 252 goto err; 253 } 254 255 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) { 256 dev_err(&client->dev, "LED %d used by Backlight\n", 257 led_dat->id); 258 goto err; 259 } 260 261 led_dat->cdev.name = cur_led->name; 262 led_dat->cdev.default_trigger = cur_led->default_trigger; 263 led_dat->cdev.brightness_set = adp8860_led_set; 264 led_dat->cdev.brightness = LED_OFF; 265 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT; 266 led_dat->client = client; 267 led_dat->new_brightness = LED_OFF; 268 INIT_WORK(&led_dat->work, adp8860_led_work); 269 270 ret = led_classdev_register(&client->dev, &led_dat->cdev); 271 if (ret) { 272 dev_err(&client->dev, "failed to register LED %d\n", 273 led_dat->id); 274 goto err; 275 } 276 277 ret = adp8860_led_setup(led_dat); 278 if (ret) { 279 dev_err(&client->dev, "failed to write\n"); 280 i++; 281 goto err; 282 } 283 } 284 285 data->led = led; 286 287 return 0; 288 289 err: 290 for (i = i - 1; i >= 0; --i) { 291 led_classdev_unregister(&led[i].cdev); 292 cancel_work_sync(&led[i].work); 293 } 294 295 err_free: 296 kfree(led); 297 298 return ret; 299 } 300 301 static int __devexit adp8860_led_remove(struct i2c_client *client) 302 { 303 struct adp8860_backlight_platform_data *pdata = 304 client->dev.platform_data; 305 struct adp8860_bl *data = i2c_get_clientdata(client); 306 int i; 307 308 for (i = 0; i < pdata->num_leds; i++) { 309 led_classdev_unregister(&data->led[i].cdev); 310 cancel_work_sync(&data->led[i].work); 311 } 312 313 kfree(data->led); 314 return 0; 315 } 316 #else 317 static int __devinit adp8860_led_probe(struct i2c_client *client) 318 { 319 return 0; 320 } 321 322 static int __devexit adp8860_led_remove(struct i2c_client *client) 323 { 324 return 0; 325 } 326 #endif 327 328 static int adp8860_bl_set(struct backlight_device *bl, int brightness) 329 { 330 struct adp8860_bl *data = bl_get_data(bl); 331 struct i2c_client *client = data->client; 332 int ret = 0; 333 334 if (data->en_ambl_sens) { 335 if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) { 336 /* Disable Ambient Light auto adjust */ 337 ret |= adp8860_clr_bits(client, ADP8860_MDCR, 338 CMP_AUTOEN); 339 ret |= adp8860_write(client, ADP8860_BLMX1, brightness); 340 } else { 341 /* 342 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust 343 * restore daylight l1 sysfs brightness 344 */ 345 ret |= adp8860_write(client, ADP8860_BLMX1, 346 data->cached_daylight_max); 347 ret |= adp8860_set_bits(client, ADP8860_MDCR, 348 CMP_AUTOEN); 349 } 350 } else 351 ret |= adp8860_write(client, ADP8860_BLMX1, brightness); 352 353 if (data->current_brightness && brightness == 0) 354 ret |= adp8860_set_bits(client, 355 ADP8860_MDCR, DIM_EN); 356 else if (data->current_brightness == 0 && brightness) 357 ret |= adp8860_clr_bits(client, 358 ADP8860_MDCR, DIM_EN); 359 360 if (!ret) 361 data->current_brightness = brightness; 362 363 return ret; 364 } 365 366 static int adp8860_bl_update_status(struct backlight_device *bl) 367 { 368 int brightness = bl->props.brightness; 369 if (bl->props.power != FB_BLANK_UNBLANK) 370 brightness = 0; 371 372 if (bl->props.fb_blank != FB_BLANK_UNBLANK) 373 brightness = 0; 374 375 return adp8860_bl_set(bl, brightness); 376 } 377 378 static int adp8860_bl_get_brightness(struct backlight_device *bl) 379 { 380 struct adp8860_bl *data = bl_get_data(bl); 381 382 return data->current_brightness; 383 } 384 385 static const struct backlight_ops adp8860_bl_ops = { 386 .update_status = adp8860_bl_update_status, 387 .get_brightness = adp8860_bl_get_brightness, 388 }; 389 390 static int adp8860_bl_setup(struct backlight_device *bl) 391 { 392 struct adp8860_bl *data = bl_get_data(bl); 393 struct i2c_client *client = data->client; 394 struct adp8860_backlight_platform_data *pdata = data->pdata; 395 int ret = 0; 396 397 ret |= adp8860_write(client, ADP8860_BLSEN, ~pdata->bl_led_assign); 398 ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max); 399 ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim); 400 401 if (data->en_ambl_sens) { 402 data->cached_daylight_max = pdata->l1_daylight_max; 403 ret |= adp8860_write(client, ADP8860_BLMX2, 404 pdata->l2_office_max); 405 ret |= adp8860_write(client, ADP8860_BLDM2, 406 pdata->l2_office_dim); 407 ret |= adp8860_write(client, ADP8860_BLMX3, 408 pdata->l3_dark_max); 409 ret |= adp8860_write(client, ADP8860_BLDM3, 410 pdata->l3_dark_dim); 411 412 ret |= adp8860_write(client, ADP8860_L2_TRP, pdata->l2_trip); 413 ret |= adp8860_write(client, ADP8860_L2_HYS, pdata->l2_hyst); 414 ret |= adp8860_write(client, ADP8860_L3_TRP, pdata->l3_trip); 415 ret |= adp8860_write(client, ADP8860_L3_HYS, pdata->l3_hyst); 416 ret |= adp8860_write(client, ADP8860_CCFG, L2_EN | L3_EN | 417 ALS_CCFG_VAL(pdata->abml_filt)); 418 } 419 420 ret |= adp8860_write(client, ADP8860_CFGR, 421 BL_CFGR_VAL(pdata->bl_fade_law, 0)); 422 423 ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in, 424 pdata->bl_fade_out)); 425 426 ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY | 427 (data->gdwn_dis ? GDWN_DIS : 0)); 428 429 return ret; 430 } 431 432 static ssize_t adp8860_show(struct device *dev, char *buf, int reg) 433 { 434 struct adp8860_bl *data = dev_get_drvdata(dev); 435 int error; 436 uint8_t reg_val; 437 438 mutex_lock(&data->lock); 439 error = adp8860_read(data->client, reg, ®_val); 440 mutex_unlock(&data->lock); 441 442 if (error < 0) 443 return error; 444 445 return sprintf(buf, "%u\n", reg_val); 446 } 447 448 static ssize_t adp8860_store(struct device *dev, const char *buf, 449 size_t count, int reg) 450 { 451 struct adp8860_bl *data = dev_get_drvdata(dev); 452 unsigned long val; 453 int ret; 454 455 ret = strict_strtoul(buf, 10, &val); 456 if (ret) 457 return ret; 458 459 mutex_lock(&data->lock); 460 adp8860_write(data->client, reg, val); 461 mutex_unlock(&data->lock); 462 463 return count; 464 } 465 466 static ssize_t adp8860_bl_l3_dark_max_show(struct device *dev, 467 struct device_attribute *attr, char *buf) 468 { 469 return adp8860_show(dev, buf, ADP8860_BLMX3); 470 } 471 472 static ssize_t adp8860_bl_l3_dark_max_store(struct device *dev, 473 struct device_attribute *attr, const char *buf, size_t count) 474 { 475 return adp8860_store(dev, buf, count, ADP8860_BLMX3); 476 } 477 478 static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show, 479 adp8860_bl_l3_dark_max_store); 480 481 static ssize_t adp8860_bl_l2_office_max_show(struct device *dev, 482 struct device_attribute *attr, char *buf) 483 { 484 return adp8860_show(dev, buf, ADP8860_BLMX2); 485 } 486 487 static ssize_t adp8860_bl_l2_office_max_store(struct device *dev, 488 struct device_attribute *attr, const char *buf, size_t count) 489 { 490 return adp8860_store(dev, buf, count, ADP8860_BLMX2); 491 } 492 static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show, 493 adp8860_bl_l2_office_max_store); 494 495 static ssize_t adp8860_bl_l1_daylight_max_show(struct device *dev, 496 struct device_attribute *attr, char *buf) 497 { 498 return adp8860_show(dev, buf, ADP8860_BLMX1); 499 } 500 501 static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev, 502 struct device_attribute *attr, const char *buf, size_t count) 503 { 504 struct adp8860_bl *data = dev_get_drvdata(dev); 505 506 strict_strtoul(buf, 10, &data->cached_daylight_max); 507 return adp8860_store(dev, buf, count, ADP8860_BLMX1); 508 } 509 static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show, 510 adp8860_bl_l1_daylight_max_store); 511 512 static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev, 513 struct device_attribute *attr, char *buf) 514 { 515 return adp8860_show(dev, buf, ADP8860_BLDM3); 516 } 517 518 static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev, 519 struct device_attribute *attr, 520 const char *buf, size_t count) 521 { 522 return adp8860_store(dev, buf, count, ADP8860_BLDM3); 523 } 524 static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show, 525 adp8860_bl_l3_dark_dim_store); 526 527 static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev, 528 struct device_attribute *attr, char *buf) 529 { 530 return adp8860_show(dev, buf, ADP8860_BLDM2); 531 } 532 533 static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev, 534 struct device_attribute *attr, 535 const char *buf, size_t count) 536 { 537 return adp8860_store(dev, buf, count, ADP8860_BLDM2); 538 } 539 static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show, 540 adp8860_bl_l2_office_dim_store); 541 542 static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev, 543 struct device_attribute *attr, char *buf) 544 { 545 return adp8860_show(dev, buf, ADP8860_BLDM1); 546 } 547 548 static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev, 549 struct device_attribute *attr, 550 const char *buf, size_t count) 551 { 552 return adp8860_store(dev, buf, count, ADP8860_BLDM1); 553 } 554 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show, 555 adp8860_bl_l1_daylight_dim_store); 556 557 #ifdef ADP8860_EXT_FEATURES 558 static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev, 559 struct device_attribute *attr, char *buf) 560 { 561 struct adp8860_bl *data = dev_get_drvdata(dev); 562 int error; 563 uint8_t reg_val; 564 uint16_t ret_val; 565 566 mutex_lock(&data->lock); 567 error = adp8860_read(data->client, ADP8860_PH1LEVL, ®_val); 568 ret_val = reg_val; 569 error |= adp8860_read(data->client, ADP8860_PH1LEVH, ®_val); 570 mutex_unlock(&data->lock); 571 572 if (error < 0) 573 return error; 574 575 /* Return 13-bit conversion value for the first light sensor */ 576 ret_val += (reg_val & 0x1F) << 8; 577 578 return sprintf(buf, "%u\n", ret_val); 579 } 580 static DEVICE_ATTR(ambient_light_level, 0444, 581 adp8860_bl_ambient_light_level_show, NULL); 582 583 static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev, 584 struct device_attribute *attr, char *buf) 585 { 586 struct adp8860_bl *data = dev_get_drvdata(dev); 587 int error; 588 uint8_t reg_val; 589 590 mutex_lock(&data->lock); 591 error = adp8860_read(data->client, ADP8860_CFGR, ®_val); 592 mutex_unlock(&data->lock); 593 594 if (error < 0) 595 return error; 596 597 return sprintf(buf, "%u\n", 598 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1); 599 } 600 601 static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev, 602 struct device_attribute *attr, 603 const char *buf, size_t count) 604 { 605 struct adp8860_bl *data = dev_get_drvdata(dev); 606 unsigned long val; 607 uint8_t reg_val; 608 int ret; 609 610 ret = strict_strtoul(buf, 10, &val); 611 if (ret) 612 return ret; 613 614 if (val == 0) { 615 /* Enable automatic ambient light sensing */ 616 adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 617 } else if ((val > 0) && (val < 6)) { 618 /* Disable automatic ambient light sensing */ 619 adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 620 621 /* Set user supplied ambient light zone */ 622 mutex_lock(&data->lock); 623 adp8860_read(data->client, ADP8860_CFGR, ®_val); 624 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 625 reg_val |= val << CFGR_BLV_SHIFT; 626 adp8860_write(data->client, ADP8860_CFGR, reg_val); 627 mutex_unlock(&data->lock); 628 } 629 630 return count; 631 } 632 static DEVICE_ATTR(ambient_light_zone, 0664, 633 adp8860_bl_ambient_light_zone_show, 634 adp8860_bl_ambient_light_zone_store); 635 #endif 636 637 static struct attribute *adp8860_bl_attributes[] = { 638 &dev_attr_l3_dark_max.attr, 639 &dev_attr_l3_dark_dim.attr, 640 &dev_attr_l2_office_max.attr, 641 &dev_attr_l2_office_dim.attr, 642 &dev_attr_l1_daylight_max.attr, 643 &dev_attr_l1_daylight_dim.attr, 644 #ifdef ADP8860_EXT_FEATURES 645 &dev_attr_ambient_light_level.attr, 646 &dev_attr_ambient_light_zone.attr, 647 #endif 648 NULL 649 }; 650 651 static const struct attribute_group adp8860_bl_attr_group = { 652 .attrs = adp8860_bl_attributes, 653 }; 654 655 static int __devinit adp8860_probe(struct i2c_client *client, 656 const struct i2c_device_id *id) 657 { 658 struct backlight_device *bl; 659 struct adp8860_bl *data; 660 struct adp8860_backlight_platform_data *pdata = 661 client->dev.platform_data; 662 struct backlight_properties props; 663 uint8_t reg_val; 664 int ret; 665 666 if (!i2c_check_functionality(client->adapter, 667 I2C_FUNC_SMBUS_BYTE_DATA)) { 668 dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); 669 return -EIO; 670 } 671 672 if (!pdata) { 673 dev_err(&client->dev, "no platform data?\n"); 674 return -EINVAL; 675 } 676 677 data = kzalloc(sizeof(*data), GFP_KERNEL); 678 if (data == NULL) 679 return -ENOMEM; 680 681 ret = adp8860_read(client, ADP8860_MFDVID, ®_val); 682 if (ret < 0) 683 goto out2; 684 685 switch (ADP8860_MANID(reg_val)) { 686 case ADP8863_MANUFID: 687 data->gdwn_dis = !!pdata->gdwn_dis; 688 case ADP8860_MANUFID: 689 data->en_ambl_sens = !!pdata->en_ambl_sens; 690 break; 691 case ADP8861_MANUFID: 692 data->gdwn_dis = !!pdata->gdwn_dis; 693 break; 694 default: 695 dev_err(&client->dev, "failed to probe\n"); 696 ret = -ENODEV; 697 goto out2; 698 } 699 700 /* It's confirmed that the DEVID field is actually a REVID */ 701 702 data->revid = ADP8860_DEVID(reg_val); 703 data->client = client; 704 data->pdata = pdata; 705 data->id = id->driver_data; 706 data->current_brightness = 0; 707 i2c_set_clientdata(client, data); 708 709 memset(&props, 0, sizeof(props)); 710 props.max_brightness = ADP8860_MAX_BRIGHTNESS; 711 712 mutex_init(&data->lock); 713 714 bl = backlight_device_register(dev_driver_string(&client->dev), 715 &client->dev, data, &adp8860_bl_ops, &props); 716 if (IS_ERR(bl)) { 717 dev_err(&client->dev, "failed to register backlight\n"); 718 ret = PTR_ERR(bl); 719 goto out2; 720 } 721 722 bl->props.max_brightness = 723 bl->props.brightness = ADP8860_MAX_BRIGHTNESS; 724 725 data->bl = bl; 726 727 if (data->en_ambl_sens) 728 ret = sysfs_create_group(&bl->dev.kobj, 729 &adp8860_bl_attr_group); 730 731 if (ret) { 732 dev_err(&client->dev, "failed to register sysfs\n"); 733 goto out1; 734 } 735 736 ret = adp8860_bl_setup(bl); 737 if (ret) { 738 ret = -EIO; 739 goto out; 740 } 741 742 backlight_update_status(bl); 743 744 dev_info(&client->dev, "%s Rev.%d Backlight\n", 745 client->name, data->revid); 746 747 if (pdata->num_leds) 748 adp8860_led_probe(client); 749 750 return 0; 751 752 out: 753 if (data->en_ambl_sens) 754 sysfs_remove_group(&data->bl->dev.kobj, 755 &adp8860_bl_attr_group); 756 out1: 757 backlight_device_unregister(bl); 758 out2: 759 kfree(data); 760 761 return ret; 762 } 763 764 static int __devexit adp8860_remove(struct i2c_client *client) 765 { 766 struct adp8860_bl *data = i2c_get_clientdata(client); 767 768 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 769 770 if (data->led) 771 adp8860_led_remove(client); 772 773 if (data->en_ambl_sens) 774 sysfs_remove_group(&data->bl->dev.kobj, 775 &adp8860_bl_attr_group); 776 777 backlight_device_unregister(data->bl); 778 kfree(data); 779 780 return 0; 781 } 782 783 #ifdef CONFIG_PM 784 static int adp8860_i2c_suspend(struct i2c_client *client, pm_message_t message) 785 { 786 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 787 788 return 0; 789 } 790 791 static int adp8860_i2c_resume(struct i2c_client *client) 792 { 793 adp8860_set_bits(client, ADP8860_MDCR, NSTBY); 794 795 return 0; 796 } 797 #else 798 #define adp8860_i2c_suspend NULL 799 #define adp8860_i2c_resume NULL 800 #endif 801 802 static const struct i2c_device_id adp8860_id[] = { 803 { "adp8860", adp8860 }, 804 { "adp8861", adp8861 }, 805 { "adp8863", adp8863 }, 806 { } 807 }; 808 MODULE_DEVICE_TABLE(i2c, adp8860_id); 809 810 static struct i2c_driver adp8860_driver = { 811 .driver = { 812 .name = KBUILD_MODNAME, 813 }, 814 .probe = adp8860_probe, 815 .remove = __devexit_p(adp8860_remove), 816 .suspend = adp8860_i2c_suspend, 817 .resume = adp8860_i2c_resume, 818 .id_table = adp8860_id, 819 }; 820 821 static int __init adp8860_init(void) 822 { 823 return i2c_add_driver(&adp8860_driver); 824 } 825 module_init(adp8860_init); 826 827 static void __exit adp8860_exit(void) 828 { 829 i2c_del_driver(&adp8860_driver); 830 } 831 module_exit(adp8860_exit); 832 833 MODULE_LICENSE("GPL v2"); 834 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 835 MODULE_DESCRIPTION("ADP8860 Backlight driver"); 836 MODULE_ALIAS("i2c:adp8860-backlight"); 837