adp8860_bl.c revision bb7ca747f8d6243b3943c5b133048652020f4a50
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 92enum { 93 adp8860, 94 adp8861, 95 adp8863 96}; 97 98struct 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 107struct 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 121static 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 135static int adp8860_write(struct i2c_client *client, u8 reg, u8 val) 136{ 137 return i2c_smbus_write_byte_data(client, reg, val); 138} 139 140static 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 159static 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) 182static 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 189static 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 199static 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 217static 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 301static 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 317static int __devinit adp8860_led_probe(struct i2c_client *client) 318{ 319 return 0; 320} 321 322static int __devexit adp8860_led_remove(struct i2c_client *client) 323{ 324 return 0; 325} 326#endif 327 328static 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 366static 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 378static 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 385static const struct backlight_ops adp8860_bl_ops = { 386 .update_status = adp8860_bl_update_status, 387 .get_brightness = adp8860_bl_get_brightness, 388}; 389 390static 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 432static 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 448static 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 466static 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 472static 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 478static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show, 479 adp8860_bl_l3_dark_max_store); 480 481static 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 487static 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} 492static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show, 493 adp8860_bl_l2_office_max_store); 494 495static 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 501static 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 int ret = strict_strtoul(buf, 10, &data->cached_daylight_max); 506 if (ret) 507 return ret; 508 509 return adp8860_store(dev, buf, count, ADP8860_BLMX1); 510} 511static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show, 512 adp8860_bl_l1_daylight_max_store); 513 514static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev, 515 struct device_attribute *attr, char *buf) 516{ 517 return adp8860_show(dev, buf, ADP8860_BLDM3); 518} 519 520static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev, 521 struct device_attribute *attr, 522 const char *buf, size_t count) 523{ 524 return adp8860_store(dev, buf, count, ADP8860_BLDM3); 525} 526static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show, 527 adp8860_bl_l3_dark_dim_store); 528 529static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev, 530 struct device_attribute *attr, char *buf) 531{ 532 return adp8860_show(dev, buf, ADP8860_BLDM2); 533} 534 535static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev, 536 struct device_attribute *attr, 537 const char *buf, size_t count) 538{ 539 return adp8860_store(dev, buf, count, ADP8860_BLDM2); 540} 541static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show, 542 adp8860_bl_l2_office_dim_store); 543 544static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev, 545 struct device_attribute *attr, char *buf) 546{ 547 return adp8860_show(dev, buf, ADP8860_BLDM1); 548} 549 550static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev, 551 struct device_attribute *attr, 552 const char *buf, size_t count) 553{ 554 return adp8860_store(dev, buf, count, ADP8860_BLDM1); 555} 556static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show, 557 adp8860_bl_l1_daylight_dim_store); 558 559#ifdef ADP8860_EXT_FEATURES 560static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev, 561 struct device_attribute *attr, char *buf) 562{ 563 struct adp8860_bl *data = dev_get_drvdata(dev); 564 int error; 565 uint8_t reg_val; 566 uint16_t ret_val; 567 568 mutex_lock(&data->lock); 569 error = adp8860_read(data->client, ADP8860_PH1LEVL, ®_val); 570 ret_val = reg_val; 571 error |= adp8860_read(data->client, ADP8860_PH1LEVH, ®_val); 572 mutex_unlock(&data->lock); 573 574 if (error < 0) 575 return error; 576 577 /* Return 13-bit conversion value for the first light sensor */ 578 ret_val += (reg_val & 0x1F) << 8; 579 580 return sprintf(buf, "%u\n", ret_val); 581} 582static DEVICE_ATTR(ambient_light_level, 0444, 583 adp8860_bl_ambient_light_level_show, NULL); 584 585static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev, 586 struct device_attribute *attr, char *buf) 587{ 588 struct adp8860_bl *data = dev_get_drvdata(dev); 589 int error; 590 uint8_t reg_val; 591 592 mutex_lock(&data->lock); 593 error = adp8860_read(data->client, ADP8860_CFGR, ®_val); 594 mutex_unlock(&data->lock); 595 596 if (error < 0) 597 return error; 598 599 return sprintf(buf, "%u\n", 600 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1); 601} 602 603static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev, 604 struct device_attribute *attr, 605 const char *buf, size_t count) 606{ 607 struct adp8860_bl *data = dev_get_drvdata(dev); 608 unsigned long val; 609 uint8_t reg_val; 610 int ret; 611 612 ret = strict_strtoul(buf, 10, &val); 613 if (ret) 614 return ret; 615 616 if (val == 0) { 617 /* Enable automatic ambient light sensing */ 618 adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 619 } else if ((val > 0) && (val <= 3)) { 620 /* Disable automatic ambient light sensing */ 621 adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN); 622 623 /* Set user supplied ambient light zone */ 624 mutex_lock(&data->lock); 625 adp8860_read(data->client, ADP8860_CFGR, ®_val); 626 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT); 627 reg_val |= (val - 1) << CFGR_BLV_SHIFT; 628 adp8860_write(data->client, ADP8860_CFGR, reg_val); 629 mutex_unlock(&data->lock); 630 } 631 632 return count; 633} 634static DEVICE_ATTR(ambient_light_zone, 0664, 635 adp8860_bl_ambient_light_zone_show, 636 adp8860_bl_ambient_light_zone_store); 637#endif 638 639static struct attribute *adp8860_bl_attributes[] = { 640 &dev_attr_l3_dark_max.attr, 641 &dev_attr_l3_dark_dim.attr, 642 &dev_attr_l2_office_max.attr, 643 &dev_attr_l2_office_dim.attr, 644 &dev_attr_l1_daylight_max.attr, 645 &dev_attr_l1_daylight_dim.attr, 646#ifdef ADP8860_EXT_FEATURES 647 &dev_attr_ambient_light_level.attr, 648 &dev_attr_ambient_light_zone.attr, 649#endif 650 NULL 651}; 652 653static const struct attribute_group adp8860_bl_attr_group = { 654 .attrs = adp8860_bl_attributes, 655}; 656 657static int __devinit adp8860_probe(struct i2c_client *client, 658 const struct i2c_device_id *id) 659{ 660 struct backlight_device *bl; 661 struct adp8860_bl *data; 662 struct adp8860_backlight_platform_data *pdata = 663 client->dev.platform_data; 664 struct backlight_properties props; 665 uint8_t reg_val; 666 int ret; 667 668 if (!i2c_check_functionality(client->adapter, 669 I2C_FUNC_SMBUS_BYTE_DATA)) { 670 dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); 671 return -EIO; 672 } 673 674 if (!pdata) { 675 dev_err(&client->dev, "no platform data?\n"); 676 return -EINVAL; 677 } 678 679 data = kzalloc(sizeof(*data), GFP_KERNEL); 680 if (data == NULL) 681 return -ENOMEM; 682 683 ret = adp8860_read(client, ADP8860_MFDVID, ®_val); 684 if (ret < 0) 685 goto out2; 686 687 switch (ADP8860_MANID(reg_val)) { 688 case ADP8863_MANUFID: 689 data->gdwn_dis = !!pdata->gdwn_dis; 690 case ADP8860_MANUFID: 691 data->en_ambl_sens = !!pdata->en_ambl_sens; 692 break; 693 case ADP8861_MANUFID: 694 data->gdwn_dis = !!pdata->gdwn_dis; 695 break; 696 default: 697 dev_err(&client->dev, "failed to probe\n"); 698 ret = -ENODEV; 699 goto out2; 700 } 701 702 /* It's confirmed that the DEVID field is actually a REVID */ 703 704 data->revid = ADP8860_DEVID(reg_val); 705 data->client = client; 706 data->pdata = pdata; 707 data->id = id->driver_data; 708 data->current_brightness = 0; 709 i2c_set_clientdata(client, data); 710 711 memset(&props, 0, sizeof(props)); 712 props.type = BACKLIGHT_RAW; 713 props.max_brightness = ADP8860_MAX_BRIGHTNESS; 714 715 mutex_init(&data->lock); 716 717 bl = backlight_device_register(dev_driver_string(&client->dev), 718 &client->dev, data, &adp8860_bl_ops, &props); 719 if (IS_ERR(bl)) { 720 dev_err(&client->dev, "failed to register backlight\n"); 721 ret = PTR_ERR(bl); 722 goto out2; 723 } 724 725 bl->props.max_brightness = 726 bl->props.brightness = ADP8860_MAX_BRIGHTNESS; 727 728 data->bl = bl; 729 730 if (data->en_ambl_sens) 731 ret = sysfs_create_group(&bl->dev.kobj, 732 &adp8860_bl_attr_group); 733 734 if (ret) { 735 dev_err(&client->dev, "failed to register sysfs\n"); 736 goto out1; 737 } 738 739 ret = adp8860_bl_setup(bl); 740 if (ret) { 741 ret = -EIO; 742 goto out; 743 } 744 745 backlight_update_status(bl); 746 747 dev_info(&client->dev, "%s Rev.%d Backlight\n", 748 client->name, data->revid); 749 750 if (pdata->num_leds) 751 adp8860_led_probe(client); 752 753 return 0; 754 755out: 756 if (data->en_ambl_sens) 757 sysfs_remove_group(&data->bl->dev.kobj, 758 &adp8860_bl_attr_group); 759out1: 760 backlight_device_unregister(bl); 761out2: 762 kfree(data); 763 764 return ret; 765} 766 767static int __devexit adp8860_remove(struct i2c_client *client) 768{ 769 struct adp8860_bl *data = i2c_get_clientdata(client); 770 771 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 772 773 if (data->led) 774 adp8860_led_remove(client); 775 776 if (data->en_ambl_sens) 777 sysfs_remove_group(&data->bl->dev.kobj, 778 &adp8860_bl_attr_group); 779 780 backlight_device_unregister(data->bl); 781 kfree(data); 782 783 return 0; 784} 785 786#ifdef CONFIG_PM 787static int adp8860_i2c_suspend(struct i2c_client *client, pm_message_t message) 788{ 789 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY); 790 791 return 0; 792} 793 794static int adp8860_i2c_resume(struct i2c_client *client) 795{ 796 adp8860_set_bits(client, ADP8860_MDCR, NSTBY); 797 798 return 0; 799} 800#else 801#define adp8860_i2c_suspend NULL 802#define adp8860_i2c_resume NULL 803#endif 804 805static const struct i2c_device_id adp8860_id[] = { 806 { "adp8860", adp8860 }, 807 { "adp8861", adp8861 }, 808 { "adp8863", adp8863 }, 809 { } 810}; 811MODULE_DEVICE_TABLE(i2c, adp8860_id); 812 813static struct i2c_driver adp8860_driver = { 814 .driver = { 815 .name = KBUILD_MODNAME, 816 }, 817 .probe = adp8860_probe, 818 .remove = __devexit_p(adp8860_remove), 819 .suspend = adp8860_i2c_suspend, 820 .resume = adp8860_i2c_resume, 821 .id_table = adp8860_id, 822}; 823 824static int __init adp8860_init(void) 825{ 826 return i2c_add_driver(&adp8860_driver); 827} 828module_init(adp8860_init); 829 830static void __exit adp8860_exit(void) 831{ 832 i2c_del_driver(&adp8860_driver); 833} 834module_exit(adp8860_exit); 835 836MODULE_LICENSE("GPL v2"); 837MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); 838MODULE_DESCRIPTION("ADP8860 Backlight driver"); 839MODULE_ALIAS("i2c:adp8860-backlight"); 840