1 /* 2 * leds-bd2802.c - RGB LED Driver 3 * 4 * Copyright (C) 2009 Samsung Electronics 5 * Kim Kyuwon <q1.kim@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf 12 * 13 */ 14 15 #include <linux/module.h> 16 #include <linux/i2c.h> 17 #include <linux/gpio.h> 18 #include <linux/delay.h> 19 #include <linux/leds.h> 20 #include <linux/leds-bd2802.h> 21 #include <linux/slab.h> 22 23 24 #define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0)) 25 26 #define BD2802_LED_OFFSET 0xa 27 #define BD2802_COLOR_OFFSET 0x3 28 29 #define BD2802_REG_CLKSETUP 0x00 30 #define BD2802_REG_CONTROL 0x01 31 #define BD2802_REG_HOURSETUP 0x02 32 #define BD2802_REG_CURRENT1SETUP 0x03 33 #define BD2802_REG_CURRENT2SETUP 0x04 34 #define BD2802_REG_WAVEPATTERN 0x05 35 36 #define BD2802_CURRENT_032 0x10 /* 3.2mA */ 37 #define BD2802_CURRENT_000 0x00 /* 0.0mA */ 38 39 #define BD2802_PATTERN_FULL 0x07 40 #define BD2802_PATTERN_HALF 0x03 41 42 enum led_ids { 43 LED1, 44 LED2, 45 LED_NUM, 46 }; 47 48 enum led_colors { 49 RED, 50 GREEN, 51 BLUE, 52 }; 53 54 enum led_bits { 55 BD2802_OFF, 56 BD2802_BLINK, 57 BD2802_ON, 58 }; 59 60 /* 61 * State '0' : 'off' 62 * State '1' : 'blink' 63 * State '2' : 'on'. 64 */ 65 struct led_state { 66 unsigned r:2; 67 unsigned g:2; 68 unsigned b:2; 69 }; 70 71 struct bd2802_led { 72 struct bd2802_led_platform_data *pdata; 73 struct i2c_client *client; 74 struct rw_semaphore rwsem; 75 struct work_struct work; 76 77 struct led_state led[2]; 78 79 /* 80 * Making led_classdev as array is not recommended, because array 81 * members prevent using 'container_of' macro. So repetitive works 82 * are needed. 83 */ 84 struct led_classdev cdev_led1r; 85 struct led_classdev cdev_led1g; 86 struct led_classdev cdev_led1b; 87 struct led_classdev cdev_led2r; 88 struct led_classdev cdev_led2g; 89 struct led_classdev cdev_led2b; 90 91 /* 92 * Advanced Configuration Function(ADF) mode: 93 * In ADF mode, user can set registers of BD2802GU directly, 94 * therefore BD2802GU doesn't enter reset state. 95 */ 96 int adf_on; 97 98 enum led_ids led_id; 99 enum led_colors color; 100 enum led_bits state; 101 102 /* General attributes of RGB LEDs */ 103 int wave_pattern; 104 int rgb_current; 105 }; 106 107 108 /*--------------------------------------------------------------*/ 109 /* BD2802GU helper functions */ 110 /*--------------------------------------------------------------*/ 111 112 static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id, 113 enum led_colors color) 114 { 115 switch (color) { 116 case RED: 117 return !led->led[id].r; 118 case GREEN: 119 return !led->led[id].g; 120 case BLUE: 121 return !led->led[id].b; 122 default: 123 dev_err(&led->client->dev, "%s: Invalid color\n", __func__); 124 return -EINVAL; 125 } 126 } 127 128 static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id) 129 { 130 if (led->led[id].r || led->led[id].g || led->led[id].b) 131 return 0; 132 133 return 1; 134 } 135 136 static inline int bd2802_is_all_off(struct bd2802_led *led) 137 { 138 int i; 139 140 for (i = 0; i < LED_NUM; i++) 141 if (!bd2802_is_led_off(led, i)) 142 return 0; 143 144 return 1; 145 } 146 147 static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color) 148 { 149 return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET; 150 } 151 152 static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color, 153 u8 reg_offset) 154 { 155 return reg_offset + bd2802_get_base_offset(id, color); 156 } 157 158 159 /*--------------------------------------------------------------*/ 160 /* BD2802GU core functions */ 161 /*--------------------------------------------------------------*/ 162 163 static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val) 164 { 165 int ret = i2c_smbus_write_byte_data(client, reg, val); 166 if (ret >= 0) 167 return 0; 168 169 dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", 170 __func__, reg, val, ret); 171 172 return ret; 173 } 174 175 static void bd2802_update_state(struct bd2802_led *led, enum led_ids id, 176 enum led_colors color, enum led_bits led_bit) 177 { 178 int i; 179 u8 value; 180 181 for (i = 0; i < LED_NUM; i++) { 182 if (i == id) { 183 switch (color) { 184 case RED: 185 led->led[i].r = led_bit; 186 break; 187 case GREEN: 188 led->led[i].g = led_bit; 189 break; 190 case BLUE: 191 led->led[i].b = led_bit; 192 break; 193 default: 194 dev_err(&led->client->dev, 195 "%s: Invalid color\n", __func__); 196 return; 197 } 198 } 199 } 200 201 if (led_bit == BD2802_BLINK || led_bit == BD2802_ON) 202 return; 203 204 if (!bd2802_is_led_off(led, id)) 205 return; 206 207 if (bd2802_is_all_off(led) && !led->adf_on) { 208 gpio_set_value(led->pdata->reset_gpio, 0); 209 return; 210 } 211 212 /* 213 * In this case, other led is turned on, and current led is turned 214 * off. So set RGB LED Control register to stop the current RGB LED 215 */ 216 value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1); 217 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value); 218 } 219 220 static void bd2802_configure(struct bd2802_led *led) 221 { 222 struct bd2802_led_platform_data *pdata = led->pdata; 223 u8 reg; 224 225 reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP); 226 bd2802_write_byte(led->client, reg, pdata->rgb_time); 227 228 reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP); 229 bd2802_write_byte(led->client, reg, pdata->rgb_time); 230 } 231 232 static void bd2802_reset_cancel(struct bd2802_led *led) 233 { 234 gpio_set_value(led->pdata->reset_gpio, 1); 235 udelay(100); 236 bd2802_configure(led); 237 } 238 239 static void bd2802_enable(struct bd2802_led *led, enum led_ids id) 240 { 241 enum led_ids other_led = (id == LED1) ? LED2 : LED1; 242 u8 value, other_led_on; 243 244 other_led_on = !bd2802_is_led_off(led, other_led); 245 if (id == LED1) 246 value = LED_CTL(other_led_on, 1); 247 else 248 value = LED_CTL(1 , other_led_on); 249 250 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value); 251 } 252 253 static void bd2802_set_on(struct bd2802_led *led, enum led_ids id, 254 enum led_colors color) 255 { 256 u8 reg; 257 258 if (bd2802_is_all_off(led) && !led->adf_on) 259 bd2802_reset_cancel(led); 260 261 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); 262 bd2802_write_byte(led->client, reg, led->rgb_current); 263 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); 264 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 265 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN); 266 bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL); 267 268 bd2802_enable(led, id); 269 bd2802_update_state(led, id, color, BD2802_ON); 270 } 271 272 static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id, 273 enum led_colors color) 274 { 275 u8 reg; 276 277 if (bd2802_is_all_off(led) && !led->adf_on) 278 bd2802_reset_cancel(led); 279 280 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); 281 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 282 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); 283 bd2802_write_byte(led->client, reg, led->rgb_current); 284 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN); 285 bd2802_write_byte(led->client, reg, led->wave_pattern); 286 287 bd2802_enable(led, id); 288 bd2802_update_state(led, id, color, BD2802_BLINK); 289 } 290 291 static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id, 292 enum led_colors color, enum led_bits led_bit) 293 { 294 if (led_bit == BD2802_OFF) { 295 dev_err(&led->client->dev, 296 "Only 'blink' and 'on' are allowed\n"); 297 return; 298 } 299 300 if (led_bit == BD2802_BLINK) 301 bd2802_set_blink(led, id, color); 302 else 303 bd2802_set_on(led, id, color); 304 } 305 306 static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id, 307 enum led_colors color) 308 { 309 u8 reg; 310 311 if (bd2802_is_rgb_off(led, id, color)) 312 return; 313 314 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); 315 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 316 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); 317 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 318 319 bd2802_update_state(led, id, color, BD2802_OFF); 320 } 321 322 static void bd2802_restore_state(struct bd2802_led *led) 323 { 324 int i; 325 326 for (i = 0; i < LED_NUM; i++) { 327 if (led->led[i].r) 328 bd2802_turn_on(led, i, RED, led->led[i].r); 329 if (led->led[i].g) 330 bd2802_turn_on(led, i, GREEN, led->led[i].g); 331 if (led->led[i].b) 332 bd2802_turn_on(led, i, BLUE, led->led[i].b); 333 } 334 } 335 336 #define BD2802_SET_REGISTER(reg_addr, reg_name) \ 337 static ssize_t bd2802_store_reg##reg_addr(struct device *dev, \ 338 struct device_attribute *attr, const char *buf, size_t count) \ 339 { \ 340 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 341 unsigned long val; \ 342 int ret; \ 343 if (!count) \ 344 return -EINVAL; \ 345 ret = strict_strtoul(buf, 16, &val); \ 346 if (ret) \ 347 return ret; \ 348 down_write(&led->rwsem); \ 349 bd2802_write_byte(led->client, reg_addr, (u8) val); \ 350 up_write(&led->rwsem); \ 351 return count; \ 352 } \ 353 static struct device_attribute bd2802_reg##reg_addr##_attr = { \ 354 .attr = {.name = reg_name, .mode = 0644, .owner = THIS_MODULE}, \ 355 .store = bd2802_store_reg##reg_addr, \ 356 }; 357 358 BD2802_SET_REGISTER(0x00, "0x00"); 359 BD2802_SET_REGISTER(0x01, "0x01"); 360 BD2802_SET_REGISTER(0x02, "0x02"); 361 BD2802_SET_REGISTER(0x03, "0x03"); 362 BD2802_SET_REGISTER(0x04, "0x04"); 363 BD2802_SET_REGISTER(0x05, "0x05"); 364 BD2802_SET_REGISTER(0x06, "0x06"); 365 BD2802_SET_REGISTER(0x07, "0x07"); 366 BD2802_SET_REGISTER(0x08, "0x08"); 367 BD2802_SET_REGISTER(0x09, "0x09"); 368 BD2802_SET_REGISTER(0x0a, "0x0a"); 369 BD2802_SET_REGISTER(0x0b, "0x0b"); 370 BD2802_SET_REGISTER(0x0c, "0x0c"); 371 BD2802_SET_REGISTER(0x0d, "0x0d"); 372 BD2802_SET_REGISTER(0x0e, "0x0e"); 373 BD2802_SET_REGISTER(0x0f, "0x0f"); 374 BD2802_SET_REGISTER(0x10, "0x10"); 375 BD2802_SET_REGISTER(0x11, "0x11"); 376 BD2802_SET_REGISTER(0x12, "0x12"); 377 BD2802_SET_REGISTER(0x13, "0x13"); 378 BD2802_SET_REGISTER(0x14, "0x14"); 379 BD2802_SET_REGISTER(0x15, "0x15"); 380 381 static struct device_attribute *bd2802_addr_attributes[] = { 382 &bd2802_reg0x00_attr, 383 &bd2802_reg0x01_attr, 384 &bd2802_reg0x02_attr, 385 &bd2802_reg0x03_attr, 386 &bd2802_reg0x04_attr, 387 &bd2802_reg0x05_attr, 388 &bd2802_reg0x06_attr, 389 &bd2802_reg0x07_attr, 390 &bd2802_reg0x08_attr, 391 &bd2802_reg0x09_attr, 392 &bd2802_reg0x0a_attr, 393 &bd2802_reg0x0b_attr, 394 &bd2802_reg0x0c_attr, 395 &bd2802_reg0x0d_attr, 396 &bd2802_reg0x0e_attr, 397 &bd2802_reg0x0f_attr, 398 &bd2802_reg0x10_attr, 399 &bd2802_reg0x11_attr, 400 &bd2802_reg0x12_attr, 401 &bd2802_reg0x13_attr, 402 &bd2802_reg0x14_attr, 403 &bd2802_reg0x15_attr, 404 }; 405 406 static void bd2802_enable_adv_conf(struct bd2802_led *led) 407 { 408 int i, ret; 409 410 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) { 411 ret = device_create_file(&led->client->dev, 412 bd2802_addr_attributes[i]); 413 if (ret) { 414 dev_err(&led->client->dev, "failed: sysfs file %s\n", 415 bd2802_addr_attributes[i]->attr.name); 416 goto failed_remove_files; 417 } 418 } 419 420 if (bd2802_is_all_off(led)) 421 bd2802_reset_cancel(led); 422 423 led->adf_on = 1; 424 425 return; 426 427 failed_remove_files: 428 for (i--; i >= 0; i--) 429 device_remove_file(&led->client->dev, 430 bd2802_addr_attributes[i]); 431 } 432 433 static void bd2802_disable_adv_conf(struct bd2802_led *led) 434 { 435 int i; 436 437 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) 438 device_remove_file(&led->client->dev, 439 bd2802_addr_attributes[i]); 440 441 if (bd2802_is_all_off(led)) 442 gpio_set_value(led->pdata->reset_gpio, 0); 443 444 led->adf_on = 0; 445 } 446 447 static ssize_t bd2802_show_adv_conf(struct device *dev, 448 struct device_attribute *attr, char *buf) 449 { 450 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev)); 451 ssize_t ret; 452 453 down_read(&led->rwsem); 454 if (led->adf_on) 455 ret = sprintf(buf, "on\n"); 456 else 457 ret = sprintf(buf, "off\n"); 458 up_read(&led->rwsem); 459 460 return ret; 461 } 462 463 static ssize_t bd2802_store_adv_conf(struct device *dev, 464 struct device_attribute *attr, const char *buf, size_t count) 465 { 466 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev)); 467 468 if (!count) 469 return -EINVAL; 470 471 down_write(&led->rwsem); 472 if (!led->adf_on && !strncmp(buf, "on", 2)) 473 bd2802_enable_adv_conf(led); 474 else if (led->adf_on && !strncmp(buf, "off", 3)) 475 bd2802_disable_adv_conf(led); 476 up_write(&led->rwsem); 477 478 return count; 479 } 480 481 static struct device_attribute bd2802_adv_conf_attr = { 482 .attr = { 483 .name = "advanced_configuration", 484 .mode = 0644, 485 .owner = THIS_MODULE 486 }, 487 .show = bd2802_show_adv_conf, 488 .store = bd2802_store_adv_conf, 489 }; 490 491 #define BD2802_CONTROL_ATTR(attr_name, name_str) \ 492 static ssize_t bd2802_show_##attr_name(struct device *dev, \ 493 struct device_attribute *attr, char *buf) \ 494 { \ 495 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 496 ssize_t ret; \ 497 down_read(&led->rwsem); \ 498 ret = sprintf(buf, "0x%02x\n", led->attr_name); \ 499 up_read(&led->rwsem); \ 500 return ret; \ 501 } \ 502 static ssize_t bd2802_store_##attr_name(struct device *dev, \ 503 struct device_attribute *attr, const char *buf, size_t count) \ 504 { \ 505 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 506 unsigned long val; \ 507 int ret; \ 508 if (!count) \ 509 return -EINVAL; \ 510 ret = strict_strtoul(buf, 16, &val); \ 511 if (ret) \ 512 return ret; \ 513 down_write(&led->rwsem); \ 514 led->attr_name = val; \ 515 up_write(&led->rwsem); \ 516 return count; \ 517 } \ 518 static struct device_attribute bd2802_##attr_name##_attr = { \ 519 .attr = { \ 520 .name = name_str, \ 521 .mode = 0644, \ 522 .owner = THIS_MODULE \ 523 }, \ 524 .show = bd2802_show_##attr_name, \ 525 .store = bd2802_store_##attr_name, \ 526 }; 527 528 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern"); 529 BD2802_CONTROL_ATTR(rgb_current, "rgb_current"); 530 531 static struct device_attribute *bd2802_attributes[] = { 532 &bd2802_adv_conf_attr, 533 &bd2802_wave_pattern_attr, 534 &bd2802_rgb_current_attr, 535 }; 536 537 static void bd2802_led_work(struct work_struct *work) 538 { 539 struct bd2802_led *led = container_of(work, struct bd2802_led, work); 540 541 if (led->state) 542 bd2802_turn_on(led, led->led_id, led->color, led->state); 543 else 544 bd2802_turn_off(led, led->led_id, led->color); 545 } 546 547 #define BD2802_CONTROL_RGBS(name, id, clr) \ 548 static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\ 549 enum led_brightness value) \ 550 { \ 551 struct bd2802_led *led = \ 552 container_of(led_cdev, struct bd2802_led, cdev_##name); \ 553 led->led_id = id; \ 554 led->color = clr; \ 555 if (value == LED_OFF) \ 556 led->state = BD2802_OFF; \ 557 else \ 558 led->state = BD2802_ON; \ 559 schedule_work(&led->work); \ 560 } \ 561 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev, \ 562 unsigned long *delay_on, unsigned long *delay_off) \ 563 { \ 564 struct bd2802_led *led = \ 565 container_of(led_cdev, struct bd2802_led, cdev_##name); \ 566 if (*delay_on == 0 || *delay_off == 0) \ 567 return -EINVAL; \ 568 led->led_id = id; \ 569 led->color = clr; \ 570 led->state = BD2802_BLINK; \ 571 schedule_work(&led->work); \ 572 return 0; \ 573 } 574 575 BD2802_CONTROL_RGBS(led1r, LED1, RED); 576 BD2802_CONTROL_RGBS(led1g, LED1, GREEN); 577 BD2802_CONTROL_RGBS(led1b, LED1, BLUE); 578 BD2802_CONTROL_RGBS(led2r, LED2, RED); 579 BD2802_CONTROL_RGBS(led2g, LED2, GREEN); 580 BD2802_CONTROL_RGBS(led2b, LED2, BLUE); 581 582 static int bd2802_register_led_classdev(struct bd2802_led *led) 583 { 584 int ret; 585 586 INIT_WORK(&led->work, bd2802_led_work); 587 588 led->cdev_led1r.name = "led1_R"; 589 led->cdev_led1r.brightness = LED_OFF; 590 led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness; 591 led->cdev_led1r.blink_set = bd2802_set_led1r_blink; 592 593 ret = led_classdev_register(&led->client->dev, &led->cdev_led1r); 594 if (ret < 0) { 595 dev_err(&led->client->dev, "couldn't register LED %s\n", 596 led->cdev_led1r.name); 597 goto failed_unregister_led1_R; 598 } 599 600 led->cdev_led1g.name = "led1_G"; 601 led->cdev_led1g.brightness = LED_OFF; 602 led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness; 603 led->cdev_led1g.blink_set = bd2802_set_led1g_blink; 604 605 ret = led_classdev_register(&led->client->dev, &led->cdev_led1g); 606 if (ret < 0) { 607 dev_err(&led->client->dev, "couldn't register LED %s\n", 608 led->cdev_led1g.name); 609 goto failed_unregister_led1_G; 610 } 611 612 led->cdev_led1b.name = "led1_B"; 613 led->cdev_led1b.brightness = LED_OFF; 614 led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness; 615 led->cdev_led1b.blink_set = bd2802_set_led1b_blink; 616 617 ret = led_classdev_register(&led->client->dev, &led->cdev_led1b); 618 if (ret < 0) { 619 dev_err(&led->client->dev, "couldn't register LED %s\n", 620 led->cdev_led1b.name); 621 goto failed_unregister_led1_B; 622 } 623 624 led->cdev_led2r.name = "led2_R"; 625 led->cdev_led2r.brightness = LED_OFF; 626 led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness; 627 led->cdev_led2r.blink_set = bd2802_set_led2r_blink; 628 629 ret = led_classdev_register(&led->client->dev, &led->cdev_led2r); 630 if (ret < 0) { 631 dev_err(&led->client->dev, "couldn't register LED %s\n", 632 led->cdev_led2r.name); 633 goto failed_unregister_led2_R; 634 } 635 636 led->cdev_led2g.name = "led2_G"; 637 led->cdev_led2g.brightness = LED_OFF; 638 led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness; 639 led->cdev_led2g.blink_set = bd2802_set_led2g_blink; 640 641 ret = led_classdev_register(&led->client->dev, &led->cdev_led2g); 642 if (ret < 0) { 643 dev_err(&led->client->dev, "couldn't register LED %s\n", 644 led->cdev_led2g.name); 645 goto failed_unregister_led2_G; 646 } 647 648 led->cdev_led2b.name = "led2_B"; 649 led->cdev_led2b.brightness = LED_OFF; 650 led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness; 651 led->cdev_led2b.blink_set = bd2802_set_led2b_blink; 652 led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME; 653 654 ret = led_classdev_register(&led->client->dev, &led->cdev_led2b); 655 if (ret < 0) { 656 dev_err(&led->client->dev, "couldn't register LED %s\n", 657 led->cdev_led2b.name); 658 goto failed_unregister_led2_B; 659 } 660 661 return 0; 662 663 failed_unregister_led2_B: 664 led_classdev_unregister(&led->cdev_led2g); 665 failed_unregister_led2_G: 666 led_classdev_unregister(&led->cdev_led2r); 667 failed_unregister_led2_R: 668 led_classdev_unregister(&led->cdev_led1b); 669 failed_unregister_led1_B: 670 led_classdev_unregister(&led->cdev_led1g); 671 failed_unregister_led1_G: 672 led_classdev_unregister(&led->cdev_led1r); 673 failed_unregister_led1_R: 674 675 return ret; 676 } 677 678 static void bd2802_unregister_led_classdev(struct bd2802_led *led) 679 { 680 cancel_work_sync(&led->work); 681 led_classdev_unregister(&led->cdev_led1r); 682 } 683 684 static int __devinit bd2802_probe(struct i2c_client *client, 685 const struct i2c_device_id *id) 686 { 687 struct bd2802_led *led; 688 struct bd2802_led_platform_data *pdata; 689 int ret, i; 690 691 led = kzalloc(sizeof(struct bd2802_led), GFP_KERNEL); 692 if (!led) { 693 dev_err(&client->dev, "failed to allocate driver data\n"); 694 return -ENOMEM; 695 } 696 697 led->client = client; 698 pdata = led->pdata = client->dev.platform_data; 699 i2c_set_clientdata(client, led); 700 701 /* Configure RESET GPIO (L: RESET, H: RESET cancel) */ 702 gpio_request(pdata->reset_gpio, "RGB_RESETB"); 703 gpio_direction_output(pdata->reset_gpio, 1); 704 705 /* Tacss = min 0.1ms */ 706 udelay(100); 707 708 /* Detect BD2802GU */ 709 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00); 710 if (ret < 0) { 711 dev_err(&client->dev, "failed to detect device\n"); 712 goto failed_free; 713 } else 714 dev_info(&client->dev, "return 0x%02x\n", ret); 715 716 /* To save the power, reset BD2802 after detecting */ 717 gpio_set_value(led->pdata->reset_gpio, 0); 718 719 /* Default attributes */ 720 led->wave_pattern = BD2802_PATTERN_HALF; 721 led->rgb_current = BD2802_CURRENT_032; 722 723 init_rwsem(&led->rwsem); 724 725 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) { 726 ret = device_create_file(&led->client->dev, 727 bd2802_attributes[i]); 728 if (ret) { 729 dev_err(&led->client->dev, "failed: sysfs file %s\n", 730 bd2802_attributes[i]->attr.name); 731 goto failed_unregister_dev_file; 732 } 733 } 734 735 ret = bd2802_register_led_classdev(led); 736 if (ret < 0) 737 goto failed_unregister_dev_file; 738 739 return 0; 740 741 failed_unregister_dev_file: 742 for (i--; i >= 0; i--) 743 device_remove_file(&led->client->dev, bd2802_attributes[i]); 744 failed_free: 745 i2c_set_clientdata(client, NULL); 746 kfree(led); 747 748 return ret; 749 } 750 751 static int __exit bd2802_remove(struct i2c_client *client) 752 { 753 struct bd2802_led *led = i2c_get_clientdata(client); 754 int i; 755 756 gpio_set_value(led->pdata->reset_gpio, 0); 757 bd2802_unregister_led_classdev(led); 758 if (led->adf_on) 759 bd2802_disable_adv_conf(led); 760 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) 761 device_remove_file(&led->client->dev, bd2802_attributes[i]); 762 i2c_set_clientdata(client, NULL); 763 kfree(led); 764 765 return 0; 766 } 767 768 static int bd2802_suspend(struct i2c_client *client, pm_message_t mesg) 769 { 770 struct bd2802_led *led = i2c_get_clientdata(client); 771 772 gpio_set_value(led->pdata->reset_gpio, 0); 773 774 return 0; 775 } 776 777 static int bd2802_resume(struct i2c_client *client) 778 { 779 struct bd2802_led *led = i2c_get_clientdata(client); 780 781 if (!bd2802_is_all_off(led) || led->adf_on) { 782 bd2802_reset_cancel(led); 783 bd2802_restore_state(led); 784 } 785 786 return 0; 787 } 788 789 static const struct i2c_device_id bd2802_id[] = { 790 { "BD2802", 0 }, 791 { } 792 }; 793 MODULE_DEVICE_TABLE(i2c, bd2802_id); 794 795 static struct i2c_driver bd2802_i2c_driver = { 796 .driver = { 797 .name = "BD2802", 798 }, 799 .probe = bd2802_probe, 800 .remove = __exit_p(bd2802_remove), 801 .suspend = bd2802_suspend, 802 .resume = bd2802_resume, 803 .id_table = bd2802_id, 804 }; 805 806 static int __init bd2802_init(void) 807 { 808 return i2c_add_driver(&bd2802_i2c_driver); 809 } 810 module_init(bd2802_init); 811 812 static void __exit bd2802_exit(void) 813 { 814 i2c_del_driver(&bd2802_i2c_driver); 815 } 816 module_exit(bd2802_exit); 817 818 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>"); 819 MODULE_DESCRIPTION("BD2802 LED driver"); 820 MODULE_LICENSE("GPL v2"); 821