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 #include <linux/pm.h> 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 76 struct led_state led[2]; 77 78 /* 79 * Making led_classdev as array is not recommended, because array 80 * members prevent using 'container_of' macro. So repetitive works 81 * are needed. 82 */ 83 struct led_classdev cdev_led1r; 84 struct led_classdev cdev_led1g; 85 struct led_classdev cdev_led1b; 86 struct led_classdev cdev_led2r; 87 struct led_classdev cdev_led2g; 88 struct led_classdev cdev_led2b; 89 90 /* 91 * Advanced Configuration Function(ADF) mode: 92 * In ADF mode, user can set registers of BD2802GU directly, 93 * therefore BD2802GU doesn't enter reset state. 94 */ 95 int adf_on; 96 97 enum led_ids led_id; 98 enum led_colors color; 99 enum led_bits state; 100 101 /* General attributes of RGB LEDs */ 102 int wave_pattern; 103 int rgb_current; 104 }; 105 106 107 /*--------------------------------------------------------------*/ 108 /* BD2802GU helper functions */ 109 /*--------------------------------------------------------------*/ 110 111 static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id, 112 enum led_colors color) 113 { 114 switch (color) { 115 case RED: 116 return !led->led[id].r; 117 case GREEN: 118 return !led->led[id].g; 119 case BLUE: 120 return !led->led[id].b; 121 default: 122 dev_err(&led->client->dev, "%s: Invalid color\n", __func__); 123 return -EINVAL; 124 } 125 } 126 127 static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id) 128 { 129 if (led->led[id].r || led->led[id].g || led->led[id].b) 130 return 0; 131 132 return 1; 133 } 134 135 static inline int bd2802_is_all_off(struct bd2802_led *led) 136 { 137 int i; 138 139 for (i = 0; i < LED_NUM; i++) 140 if (!bd2802_is_led_off(led, i)) 141 return 0; 142 143 return 1; 144 } 145 146 static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color) 147 { 148 return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET; 149 } 150 151 static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color, 152 u8 reg_offset) 153 { 154 return reg_offset + bd2802_get_base_offset(id, color); 155 } 156 157 158 /*--------------------------------------------------------------*/ 159 /* BD2802GU core functions */ 160 /*--------------------------------------------------------------*/ 161 162 static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val) 163 { 164 int ret = i2c_smbus_write_byte_data(client, reg, val); 165 if (ret >= 0) 166 return 0; 167 168 dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", 169 __func__, reg, val, ret); 170 171 return ret; 172 } 173 174 static void bd2802_update_state(struct bd2802_led *led, enum led_ids id, 175 enum led_colors color, enum led_bits led_bit) 176 { 177 int i; 178 u8 value; 179 180 for (i = 0; i < LED_NUM; i++) { 181 if (i == id) { 182 switch (color) { 183 case RED: 184 led->led[i].r = led_bit; 185 break; 186 case GREEN: 187 led->led[i].g = led_bit; 188 break; 189 case BLUE: 190 led->led[i].b = led_bit; 191 break; 192 default: 193 dev_err(&led->client->dev, 194 "%s: Invalid color\n", __func__); 195 return; 196 } 197 } 198 } 199 200 if (led_bit == BD2802_BLINK || led_bit == BD2802_ON) 201 return; 202 203 if (!bd2802_is_led_off(led, id)) 204 return; 205 206 if (bd2802_is_all_off(led) && !led->adf_on) { 207 gpio_set_value(led->pdata->reset_gpio, 0); 208 return; 209 } 210 211 /* 212 * In this case, other led is turned on, and current led is turned 213 * off. So set RGB LED Control register to stop the current RGB LED 214 */ 215 value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1); 216 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value); 217 } 218 219 static void bd2802_configure(struct bd2802_led *led) 220 { 221 struct bd2802_led_platform_data *pdata = led->pdata; 222 u8 reg; 223 224 reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP); 225 bd2802_write_byte(led->client, reg, pdata->rgb_time); 226 227 reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP); 228 bd2802_write_byte(led->client, reg, pdata->rgb_time); 229 } 230 231 static void bd2802_reset_cancel(struct bd2802_led *led) 232 { 233 gpio_set_value(led->pdata->reset_gpio, 1); 234 udelay(100); 235 bd2802_configure(led); 236 } 237 238 static void bd2802_enable(struct bd2802_led *led, enum led_ids id) 239 { 240 enum led_ids other_led = (id == LED1) ? LED2 : LED1; 241 u8 value, other_led_on; 242 243 other_led_on = !bd2802_is_led_off(led, other_led); 244 if (id == LED1) 245 value = LED_CTL(other_led_on, 1); 246 else 247 value = LED_CTL(1 , other_led_on); 248 249 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value); 250 } 251 252 static void bd2802_set_on(struct bd2802_led *led, enum led_ids id, 253 enum led_colors color) 254 { 255 u8 reg; 256 257 if (bd2802_is_all_off(led) && !led->adf_on) 258 bd2802_reset_cancel(led); 259 260 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); 261 bd2802_write_byte(led->client, reg, led->rgb_current); 262 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); 263 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 264 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN); 265 bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL); 266 267 bd2802_enable(led, id); 268 bd2802_update_state(led, id, color, BD2802_ON); 269 } 270 271 static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id, 272 enum led_colors color) 273 { 274 u8 reg; 275 276 if (bd2802_is_all_off(led) && !led->adf_on) 277 bd2802_reset_cancel(led); 278 279 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); 280 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 281 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); 282 bd2802_write_byte(led->client, reg, led->rgb_current); 283 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN); 284 bd2802_write_byte(led->client, reg, led->wave_pattern); 285 286 bd2802_enable(led, id); 287 bd2802_update_state(led, id, color, BD2802_BLINK); 288 } 289 290 static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id, 291 enum led_colors color, enum led_bits led_bit) 292 { 293 if (led_bit == BD2802_OFF) { 294 dev_err(&led->client->dev, 295 "Only 'blink' and 'on' are allowed\n"); 296 return; 297 } 298 299 if (led_bit == BD2802_BLINK) 300 bd2802_set_blink(led, id, color); 301 else 302 bd2802_set_on(led, id, color); 303 } 304 305 static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id, 306 enum led_colors color) 307 { 308 u8 reg; 309 310 if (bd2802_is_rgb_off(led, id, color)) 311 return; 312 313 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); 314 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 315 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); 316 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 317 318 bd2802_update_state(led, id, color, BD2802_OFF); 319 } 320 321 #define BD2802_SET_REGISTER(reg_addr, reg_name) \ 322 static ssize_t bd2802_store_reg##reg_addr(struct device *dev, \ 323 struct device_attribute *attr, const char *buf, size_t count) \ 324 { \ 325 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 326 unsigned long val; \ 327 int ret; \ 328 if (!count) \ 329 return -EINVAL; \ 330 ret = kstrtoul(buf, 16, &val); \ 331 if (ret) \ 332 return ret; \ 333 down_write(&led->rwsem); \ 334 bd2802_write_byte(led->client, reg_addr, (u8) val); \ 335 up_write(&led->rwsem); \ 336 return count; \ 337 } \ 338 static struct device_attribute bd2802_reg##reg_addr##_attr = { \ 339 .attr = {.name = reg_name, .mode = 0644}, \ 340 .store = bd2802_store_reg##reg_addr, \ 341 }; 342 343 BD2802_SET_REGISTER(0x00, "0x00"); 344 BD2802_SET_REGISTER(0x01, "0x01"); 345 BD2802_SET_REGISTER(0x02, "0x02"); 346 BD2802_SET_REGISTER(0x03, "0x03"); 347 BD2802_SET_REGISTER(0x04, "0x04"); 348 BD2802_SET_REGISTER(0x05, "0x05"); 349 BD2802_SET_REGISTER(0x06, "0x06"); 350 BD2802_SET_REGISTER(0x07, "0x07"); 351 BD2802_SET_REGISTER(0x08, "0x08"); 352 BD2802_SET_REGISTER(0x09, "0x09"); 353 BD2802_SET_REGISTER(0x0a, "0x0a"); 354 BD2802_SET_REGISTER(0x0b, "0x0b"); 355 BD2802_SET_REGISTER(0x0c, "0x0c"); 356 BD2802_SET_REGISTER(0x0d, "0x0d"); 357 BD2802_SET_REGISTER(0x0e, "0x0e"); 358 BD2802_SET_REGISTER(0x0f, "0x0f"); 359 BD2802_SET_REGISTER(0x10, "0x10"); 360 BD2802_SET_REGISTER(0x11, "0x11"); 361 BD2802_SET_REGISTER(0x12, "0x12"); 362 BD2802_SET_REGISTER(0x13, "0x13"); 363 BD2802_SET_REGISTER(0x14, "0x14"); 364 BD2802_SET_REGISTER(0x15, "0x15"); 365 366 static struct device_attribute *bd2802_addr_attributes[] = { 367 &bd2802_reg0x00_attr, 368 &bd2802_reg0x01_attr, 369 &bd2802_reg0x02_attr, 370 &bd2802_reg0x03_attr, 371 &bd2802_reg0x04_attr, 372 &bd2802_reg0x05_attr, 373 &bd2802_reg0x06_attr, 374 &bd2802_reg0x07_attr, 375 &bd2802_reg0x08_attr, 376 &bd2802_reg0x09_attr, 377 &bd2802_reg0x0a_attr, 378 &bd2802_reg0x0b_attr, 379 &bd2802_reg0x0c_attr, 380 &bd2802_reg0x0d_attr, 381 &bd2802_reg0x0e_attr, 382 &bd2802_reg0x0f_attr, 383 &bd2802_reg0x10_attr, 384 &bd2802_reg0x11_attr, 385 &bd2802_reg0x12_attr, 386 &bd2802_reg0x13_attr, 387 &bd2802_reg0x14_attr, 388 &bd2802_reg0x15_attr, 389 }; 390 391 static void bd2802_enable_adv_conf(struct bd2802_led *led) 392 { 393 int i, ret; 394 395 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) { 396 ret = device_create_file(&led->client->dev, 397 bd2802_addr_attributes[i]); 398 if (ret) { 399 dev_err(&led->client->dev, "failed: sysfs file %s\n", 400 bd2802_addr_attributes[i]->attr.name); 401 goto failed_remove_files; 402 } 403 } 404 405 if (bd2802_is_all_off(led)) 406 bd2802_reset_cancel(led); 407 408 led->adf_on = 1; 409 410 return; 411 412 failed_remove_files: 413 for (i--; i >= 0; i--) 414 device_remove_file(&led->client->dev, 415 bd2802_addr_attributes[i]); 416 } 417 418 static void bd2802_disable_adv_conf(struct bd2802_led *led) 419 { 420 int i; 421 422 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) 423 device_remove_file(&led->client->dev, 424 bd2802_addr_attributes[i]); 425 426 if (bd2802_is_all_off(led)) 427 gpio_set_value(led->pdata->reset_gpio, 0); 428 429 led->adf_on = 0; 430 } 431 432 static ssize_t bd2802_show_adv_conf(struct device *dev, 433 struct device_attribute *attr, char *buf) 434 { 435 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev)); 436 ssize_t ret; 437 438 down_read(&led->rwsem); 439 if (led->adf_on) 440 ret = sprintf(buf, "on\n"); 441 else 442 ret = sprintf(buf, "off\n"); 443 up_read(&led->rwsem); 444 445 return ret; 446 } 447 448 static ssize_t bd2802_store_adv_conf(struct device *dev, 449 struct device_attribute *attr, const char *buf, size_t count) 450 { 451 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev)); 452 453 if (!count) 454 return -EINVAL; 455 456 down_write(&led->rwsem); 457 if (!led->adf_on && !strncmp(buf, "on", 2)) 458 bd2802_enable_adv_conf(led); 459 else if (led->adf_on && !strncmp(buf, "off", 3)) 460 bd2802_disable_adv_conf(led); 461 up_write(&led->rwsem); 462 463 return count; 464 } 465 466 static struct device_attribute bd2802_adv_conf_attr = { 467 .attr = { 468 .name = "advanced_configuration", 469 .mode = 0644, 470 }, 471 .show = bd2802_show_adv_conf, 472 .store = bd2802_store_adv_conf, 473 }; 474 475 #define BD2802_CONTROL_ATTR(attr_name, name_str) \ 476 static ssize_t bd2802_show_##attr_name(struct device *dev, \ 477 struct device_attribute *attr, char *buf) \ 478 { \ 479 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 480 ssize_t ret; \ 481 down_read(&led->rwsem); \ 482 ret = sprintf(buf, "0x%02x\n", led->attr_name); \ 483 up_read(&led->rwsem); \ 484 return ret; \ 485 } \ 486 static ssize_t bd2802_store_##attr_name(struct device *dev, \ 487 struct device_attribute *attr, const char *buf, size_t count) \ 488 { \ 489 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 490 unsigned long val; \ 491 int ret; \ 492 if (!count) \ 493 return -EINVAL; \ 494 ret = kstrtoul(buf, 16, &val); \ 495 if (ret) \ 496 return ret; \ 497 down_write(&led->rwsem); \ 498 led->attr_name = val; \ 499 up_write(&led->rwsem); \ 500 return count; \ 501 } \ 502 static struct device_attribute bd2802_##attr_name##_attr = { \ 503 .attr = { \ 504 .name = name_str, \ 505 .mode = 0644, \ 506 }, \ 507 .show = bd2802_show_##attr_name, \ 508 .store = bd2802_store_##attr_name, \ 509 }; 510 511 BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern"); 512 BD2802_CONTROL_ATTR(rgb_current, "rgb_current"); 513 514 static struct device_attribute *bd2802_attributes[] = { 515 &bd2802_adv_conf_attr, 516 &bd2802_wave_pattern_attr, 517 &bd2802_rgb_current_attr, 518 }; 519 520 #define BD2802_CONTROL_RGBS(name, id, clr) \ 521 static int bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\ 522 enum led_brightness value) \ 523 { \ 524 struct bd2802_led *led = \ 525 container_of(led_cdev, struct bd2802_led, cdev_##name); \ 526 led->led_id = id; \ 527 led->color = clr; \ 528 if (value == LED_OFF) { \ 529 led->state = BD2802_OFF; \ 530 bd2802_turn_off(led, led->led_id, led->color); \ 531 } else { \ 532 led->state = BD2802_ON; \ 533 bd2802_turn_on(led, led->led_id, led->color, BD2802_ON);\ 534 } \ 535 return 0; \ 536 } \ 537 static int bd2802_set_##name##_blink(struct led_classdev *led_cdev, \ 538 unsigned long *delay_on, unsigned long *delay_off) \ 539 { \ 540 struct bd2802_led *led = \ 541 container_of(led_cdev, struct bd2802_led, cdev_##name); \ 542 if (*delay_on == 0 || *delay_off == 0) \ 543 return -EINVAL; \ 544 led->led_id = id; \ 545 led->color = clr; \ 546 led->state = BD2802_BLINK; \ 547 bd2802_turn_on(led, led->led_id, led->color, BD2802_BLINK); \ 548 return 0; \ 549 } 550 551 BD2802_CONTROL_RGBS(led1r, LED1, RED); 552 BD2802_CONTROL_RGBS(led1g, LED1, GREEN); 553 BD2802_CONTROL_RGBS(led1b, LED1, BLUE); 554 BD2802_CONTROL_RGBS(led2r, LED2, RED); 555 BD2802_CONTROL_RGBS(led2g, LED2, GREEN); 556 BD2802_CONTROL_RGBS(led2b, LED2, BLUE); 557 558 static int bd2802_register_led_classdev(struct bd2802_led *led) 559 { 560 int ret; 561 562 led->cdev_led1r.name = "led1_R"; 563 led->cdev_led1r.brightness = LED_OFF; 564 led->cdev_led1r.brightness_set_blocking = bd2802_set_led1r_brightness; 565 led->cdev_led1r.blink_set = bd2802_set_led1r_blink; 566 567 ret = led_classdev_register(&led->client->dev, &led->cdev_led1r); 568 if (ret < 0) { 569 dev_err(&led->client->dev, "couldn't register LED %s\n", 570 led->cdev_led1r.name); 571 goto failed_unregister_led1_R; 572 } 573 574 led->cdev_led1g.name = "led1_G"; 575 led->cdev_led1g.brightness = LED_OFF; 576 led->cdev_led1g.brightness_set_blocking = bd2802_set_led1g_brightness; 577 led->cdev_led1g.blink_set = bd2802_set_led1g_blink; 578 579 ret = led_classdev_register(&led->client->dev, &led->cdev_led1g); 580 if (ret < 0) { 581 dev_err(&led->client->dev, "couldn't register LED %s\n", 582 led->cdev_led1g.name); 583 goto failed_unregister_led1_G; 584 } 585 586 led->cdev_led1b.name = "led1_B"; 587 led->cdev_led1b.brightness = LED_OFF; 588 led->cdev_led1b.brightness_set_blocking = bd2802_set_led1b_brightness; 589 led->cdev_led1b.blink_set = bd2802_set_led1b_blink; 590 591 ret = led_classdev_register(&led->client->dev, &led->cdev_led1b); 592 if (ret < 0) { 593 dev_err(&led->client->dev, "couldn't register LED %s\n", 594 led->cdev_led1b.name); 595 goto failed_unregister_led1_B; 596 } 597 598 led->cdev_led2r.name = "led2_R"; 599 led->cdev_led2r.brightness = LED_OFF; 600 led->cdev_led2r.brightness_set_blocking = bd2802_set_led2r_brightness; 601 led->cdev_led2r.blink_set = bd2802_set_led2r_blink; 602 603 ret = led_classdev_register(&led->client->dev, &led->cdev_led2r); 604 if (ret < 0) { 605 dev_err(&led->client->dev, "couldn't register LED %s\n", 606 led->cdev_led2r.name); 607 goto failed_unregister_led2_R; 608 } 609 610 led->cdev_led2g.name = "led2_G"; 611 led->cdev_led2g.brightness = LED_OFF; 612 led->cdev_led2g.brightness_set_blocking = bd2802_set_led2g_brightness; 613 led->cdev_led2g.blink_set = bd2802_set_led2g_blink; 614 615 ret = led_classdev_register(&led->client->dev, &led->cdev_led2g); 616 if (ret < 0) { 617 dev_err(&led->client->dev, "couldn't register LED %s\n", 618 led->cdev_led2g.name); 619 goto failed_unregister_led2_G; 620 } 621 622 led->cdev_led2b.name = "led2_B"; 623 led->cdev_led2b.brightness = LED_OFF; 624 led->cdev_led2b.brightness_set_blocking = bd2802_set_led2b_brightness; 625 led->cdev_led2b.blink_set = bd2802_set_led2b_blink; 626 led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME; 627 628 ret = led_classdev_register(&led->client->dev, &led->cdev_led2b); 629 if (ret < 0) { 630 dev_err(&led->client->dev, "couldn't register LED %s\n", 631 led->cdev_led2b.name); 632 goto failed_unregister_led2_B; 633 } 634 635 return 0; 636 637 failed_unregister_led2_B: 638 led_classdev_unregister(&led->cdev_led2g); 639 failed_unregister_led2_G: 640 led_classdev_unregister(&led->cdev_led2r); 641 failed_unregister_led2_R: 642 led_classdev_unregister(&led->cdev_led1b); 643 failed_unregister_led1_B: 644 led_classdev_unregister(&led->cdev_led1g); 645 failed_unregister_led1_G: 646 led_classdev_unregister(&led->cdev_led1r); 647 failed_unregister_led1_R: 648 649 return ret; 650 } 651 652 static void bd2802_unregister_led_classdev(struct bd2802_led *led) 653 { 654 led_classdev_unregister(&led->cdev_led2b); 655 led_classdev_unregister(&led->cdev_led2g); 656 led_classdev_unregister(&led->cdev_led2r); 657 led_classdev_unregister(&led->cdev_led1b); 658 led_classdev_unregister(&led->cdev_led1g); 659 led_classdev_unregister(&led->cdev_led1r); 660 } 661 662 static int bd2802_probe(struct i2c_client *client, 663 const struct i2c_device_id *id) 664 { 665 struct bd2802_led *led; 666 struct bd2802_led_platform_data *pdata; 667 int ret, i; 668 669 led = devm_kzalloc(&client->dev, sizeof(struct bd2802_led), GFP_KERNEL); 670 if (!led) 671 return -ENOMEM; 672 673 led->client = client; 674 pdata = led->pdata = dev_get_platdata(&client->dev); 675 i2c_set_clientdata(client, led); 676 677 /* Configure RESET GPIO (L: RESET, H: RESET cancel) */ 678 gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH, "RGB_RESETB"); 679 680 /* Tacss = min 0.1ms */ 681 udelay(100); 682 683 /* Detect BD2802GU */ 684 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00); 685 if (ret < 0) { 686 dev_err(&client->dev, "failed to detect device\n"); 687 return ret; 688 } else 689 dev_info(&client->dev, "return 0x%02x\n", ret); 690 691 /* To save the power, reset BD2802 after detecting */ 692 gpio_set_value(led->pdata->reset_gpio, 0); 693 694 /* Default attributes */ 695 led->wave_pattern = BD2802_PATTERN_HALF; 696 led->rgb_current = BD2802_CURRENT_032; 697 698 init_rwsem(&led->rwsem); 699 700 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) { 701 ret = device_create_file(&led->client->dev, 702 bd2802_attributes[i]); 703 if (ret) { 704 dev_err(&led->client->dev, "failed: sysfs file %s\n", 705 bd2802_attributes[i]->attr.name); 706 goto failed_unregister_dev_file; 707 } 708 } 709 710 ret = bd2802_register_led_classdev(led); 711 if (ret < 0) 712 goto failed_unregister_dev_file; 713 714 return 0; 715 716 failed_unregister_dev_file: 717 for (i--; i >= 0; i--) 718 device_remove_file(&led->client->dev, bd2802_attributes[i]); 719 return ret; 720 } 721 722 static int bd2802_remove(struct i2c_client *client) 723 { 724 struct bd2802_led *led = i2c_get_clientdata(client); 725 int i; 726 727 gpio_set_value(led->pdata->reset_gpio, 0); 728 bd2802_unregister_led_classdev(led); 729 if (led->adf_on) 730 bd2802_disable_adv_conf(led); 731 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) 732 device_remove_file(&led->client->dev, bd2802_attributes[i]); 733 734 return 0; 735 } 736 737 #ifdef CONFIG_PM_SLEEP 738 static void bd2802_restore_state(struct bd2802_led *led) 739 { 740 int i; 741 742 for (i = 0; i < LED_NUM; i++) { 743 if (led->led[i].r) 744 bd2802_turn_on(led, i, RED, led->led[i].r); 745 if (led->led[i].g) 746 bd2802_turn_on(led, i, GREEN, led->led[i].g); 747 if (led->led[i].b) 748 bd2802_turn_on(led, i, BLUE, led->led[i].b); 749 } 750 } 751 752 static int bd2802_suspend(struct device *dev) 753 { 754 struct i2c_client *client = to_i2c_client(dev); 755 struct bd2802_led *led = i2c_get_clientdata(client); 756 757 gpio_set_value(led->pdata->reset_gpio, 0); 758 759 return 0; 760 } 761 762 static int bd2802_resume(struct device *dev) 763 { 764 struct i2c_client *client = to_i2c_client(dev); 765 struct bd2802_led *led = i2c_get_clientdata(client); 766 767 if (!bd2802_is_all_off(led) || led->adf_on) { 768 bd2802_reset_cancel(led); 769 bd2802_restore_state(led); 770 } 771 772 return 0; 773 } 774 #endif 775 776 static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume); 777 778 static const struct i2c_device_id bd2802_id[] = { 779 { "BD2802", 0 }, 780 { } 781 }; 782 MODULE_DEVICE_TABLE(i2c, bd2802_id); 783 784 static struct i2c_driver bd2802_i2c_driver = { 785 .driver = { 786 .name = "BD2802", 787 .pm = &bd2802_pm, 788 }, 789 .probe = bd2802_probe, 790 .remove = bd2802_remove, 791 .id_table = bd2802_id, 792 }; 793 794 module_i2c_driver(bd2802_i2c_driver); 795 796 MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>"); 797 MODULE_DESCRIPTION("BD2802 LED driver"); 798 MODULE_LICENSE("GPL v2"); 799