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 42enum led_ids { 43 LED1, 44 LED2, 45 LED_NUM, 46}; 47 48enum led_colors { 49 RED, 50 GREEN, 51 BLUE, 52}; 53 54enum 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 */ 65struct led_state { 66 unsigned r:2; 67 unsigned g:2; 68 unsigned b:2; 69}; 70 71struct 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 112static 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 128static 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 136static 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 147static 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 152static 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 163static 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 175static 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 220static 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 232static 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 239static 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 253static 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 272static 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 291static 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 306static 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#define BD2802_SET_REGISTER(reg_addr, reg_name) \ 323static ssize_t bd2802_store_reg##reg_addr(struct device *dev, \ 324 struct device_attribute *attr, const char *buf, size_t count) \ 325{ \ 326 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 327 unsigned long val; \ 328 int ret; \ 329 if (!count) \ 330 return -EINVAL; \ 331 ret = kstrtoul(buf, 16, &val); \ 332 if (ret) \ 333 return ret; \ 334 down_write(&led->rwsem); \ 335 bd2802_write_byte(led->client, reg_addr, (u8) val); \ 336 up_write(&led->rwsem); \ 337 return count; \ 338} \ 339static struct device_attribute bd2802_reg##reg_addr##_attr = { \ 340 .attr = {.name = reg_name, .mode = 0644}, \ 341 .store = bd2802_store_reg##reg_addr, \ 342}; 343 344BD2802_SET_REGISTER(0x00, "0x00"); 345BD2802_SET_REGISTER(0x01, "0x01"); 346BD2802_SET_REGISTER(0x02, "0x02"); 347BD2802_SET_REGISTER(0x03, "0x03"); 348BD2802_SET_REGISTER(0x04, "0x04"); 349BD2802_SET_REGISTER(0x05, "0x05"); 350BD2802_SET_REGISTER(0x06, "0x06"); 351BD2802_SET_REGISTER(0x07, "0x07"); 352BD2802_SET_REGISTER(0x08, "0x08"); 353BD2802_SET_REGISTER(0x09, "0x09"); 354BD2802_SET_REGISTER(0x0a, "0x0a"); 355BD2802_SET_REGISTER(0x0b, "0x0b"); 356BD2802_SET_REGISTER(0x0c, "0x0c"); 357BD2802_SET_REGISTER(0x0d, "0x0d"); 358BD2802_SET_REGISTER(0x0e, "0x0e"); 359BD2802_SET_REGISTER(0x0f, "0x0f"); 360BD2802_SET_REGISTER(0x10, "0x10"); 361BD2802_SET_REGISTER(0x11, "0x11"); 362BD2802_SET_REGISTER(0x12, "0x12"); 363BD2802_SET_REGISTER(0x13, "0x13"); 364BD2802_SET_REGISTER(0x14, "0x14"); 365BD2802_SET_REGISTER(0x15, "0x15"); 366 367static struct device_attribute *bd2802_addr_attributes[] = { 368 &bd2802_reg0x00_attr, 369 &bd2802_reg0x01_attr, 370 &bd2802_reg0x02_attr, 371 &bd2802_reg0x03_attr, 372 &bd2802_reg0x04_attr, 373 &bd2802_reg0x05_attr, 374 &bd2802_reg0x06_attr, 375 &bd2802_reg0x07_attr, 376 &bd2802_reg0x08_attr, 377 &bd2802_reg0x09_attr, 378 &bd2802_reg0x0a_attr, 379 &bd2802_reg0x0b_attr, 380 &bd2802_reg0x0c_attr, 381 &bd2802_reg0x0d_attr, 382 &bd2802_reg0x0e_attr, 383 &bd2802_reg0x0f_attr, 384 &bd2802_reg0x10_attr, 385 &bd2802_reg0x11_attr, 386 &bd2802_reg0x12_attr, 387 &bd2802_reg0x13_attr, 388 &bd2802_reg0x14_attr, 389 &bd2802_reg0x15_attr, 390}; 391 392static void bd2802_enable_adv_conf(struct bd2802_led *led) 393{ 394 int i, ret; 395 396 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) { 397 ret = device_create_file(&led->client->dev, 398 bd2802_addr_attributes[i]); 399 if (ret) { 400 dev_err(&led->client->dev, "failed: sysfs file %s\n", 401 bd2802_addr_attributes[i]->attr.name); 402 goto failed_remove_files; 403 } 404 } 405 406 if (bd2802_is_all_off(led)) 407 bd2802_reset_cancel(led); 408 409 led->adf_on = 1; 410 411 return; 412 413failed_remove_files: 414 for (i--; i >= 0; i--) 415 device_remove_file(&led->client->dev, 416 bd2802_addr_attributes[i]); 417} 418 419static void bd2802_disable_adv_conf(struct bd2802_led *led) 420{ 421 int i; 422 423 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) 424 device_remove_file(&led->client->dev, 425 bd2802_addr_attributes[i]); 426 427 if (bd2802_is_all_off(led)) 428 gpio_set_value(led->pdata->reset_gpio, 0); 429 430 led->adf_on = 0; 431} 432 433static ssize_t bd2802_show_adv_conf(struct device *dev, 434 struct device_attribute *attr, char *buf) 435{ 436 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev)); 437 ssize_t ret; 438 439 down_read(&led->rwsem); 440 if (led->adf_on) 441 ret = sprintf(buf, "on\n"); 442 else 443 ret = sprintf(buf, "off\n"); 444 up_read(&led->rwsem); 445 446 return ret; 447} 448 449static ssize_t bd2802_store_adv_conf(struct device *dev, 450 struct device_attribute *attr, const char *buf, size_t count) 451{ 452 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev)); 453 454 if (!count) 455 return -EINVAL; 456 457 down_write(&led->rwsem); 458 if (!led->adf_on && !strncmp(buf, "on", 2)) 459 bd2802_enable_adv_conf(led); 460 else if (led->adf_on && !strncmp(buf, "off", 3)) 461 bd2802_disable_adv_conf(led); 462 up_write(&led->rwsem); 463 464 return count; 465} 466 467static struct device_attribute bd2802_adv_conf_attr = { 468 .attr = { 469 .name = "advanced_configuration", 470 .mode = 0644, 471 }, 472 .show = bd2802_show_adv_conf, 473 .store = bd2802_store_adv_conf, 474}; 475 476#define BD2802_CONTROL_ATTR(attr_name, name_str) \ 477static ssize_t bd2802_show_##attr_name(struct device *dev, \ 478 struct device_attribute *attr, char *buf) \ 479{ \ 480 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 481 ssize_t ret; \ 482 down_read(&led->rwsem); \ 483 ret = sprintf(buf, "0x%02x\n", led->attr_name); \ 484 up_read(&led->rwsem); \ 485 return ret; \ 486} \ 487static ssize_t bd2802_store_##attr_name(struct device *dev, \ 488 struct device_attribute *attr, const char *buf, size_t count) \ 489{ \ 490 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 491 unsigned long val; \ 492 int ret; \ 493 if (!count) \ 494 return -EINVAL; \ 495 ret = kstrtoul(buf, 16, &val); \ 496 if (ret) \ 497 return ret; \ 498 down_write(&led->rwsem); \ 499 led->attr_name = val; \ 500 up_write(&led->rwsem); \ 501 return count; \ 502} \ 503static struct device_attribute bd2802_##attr_name##_attr = { \ 504 .attr = { \ 505 .name = name_str, \ 506 .mode = 0644, \ 507 }, \ 508 .show = bd2802_show_##attr_name, \ 509 .store = bd2802_store_##attr_name, \ 510}; 511 512BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern"); 513BD2802_CONTROL_ATTR(rgb_current, "rgb_current"); 514 515static struct device_attribute *bd2802_attributes[] = { 516 &bd2802_adv_conf_attr, 517 &bd2802_wave_pattern_attr, 518 &bd2802_rgb_current_attr, 519}; 520 521static void bd2802_led_work(struct work_struct *work) 522{ 523 struct bd2802_led *led = container_of(work, struct bd2802_led, work); 524 525 if (led->state) 526 bd2802_turn_on(led, led->led_id, led->color, led->state); 527 else 528 bd2802_turn_off(led, led->led_id, led->color); 529} 530 531#define BD2802_CONTROL_RGBS(name, id, clr) \ 532static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\ 533 enum led_brightness value) \ 534{ \ 535 struct bd2802_led *led = \ 536 container_of(led_cdev, struct bd2802_led, cdev_##name); \ 537 led->led_id = id; \ 538 led->color = clr; \ 539 if (value == LED_OFF) \ 540 led->state = BD2802_OFF; \ 541 else \ 542 led->state = BD2802_ON; \ 543 schedule_work(&led->work); \ 544} \ 545static int bd2802_set_##name##_blink(struct led_classdev *led_cdev, \ 546 unsigned long *delay_on, unsigned long *delay_off) \ 547{ \ 548 struct bd2802_led *led = \ 549 container_of(led_cdev, struct bd2802_led, cdev_##name); \ 550 if (*delay_on == 0 || *delay_off == 0) \ 551 return -EINVAL; \ 552 led->led_id = id; \ 553 led->color = clr; \ 554 led->state = BD2802_BLINK; \ 555 schedule_work(&led->work); \ 556 return 0; \ 557} 558 559BD2802_CONTROL_RGBS(led1r, LED1, RED); 560BD2802_CONTROL_RGBS(led1g, LED1, GREEN); 561BD2802_CONTROL_RGBS(led1b, LED1, BLUE); 562BD2802_CONTROL_RGBS(led2r, LED2, RED); 563BD2802_CONTROL_RGBS(led2g, LED2, GREEN); 564BD2802_CONTROL_RGBS(led2b, LED2, BLUE); 565 566static int bd2802_register_led_classdev(struct bd2802_led *led) 567{ 568 int ret; 569 570 INIT_WORK(&led->work, bd2802_led_work); 571 572 led->cdev_led1r.name = "led1_R"; 573 led->cdev_led1r.brightness = LED_OFF; 574 led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness; 575 led->cdev_led1r.blink_set = bd2802_set_led1r_blink; 576 577 ret = led_classdev_register(&led->client->dev, &led->cdev_led1r); 578 if (ret < 0) { 579 dev_err(&led->client->dev, "couldn't register LED %s\n", 580 led->cdev_led1r.name); 581 goto failed_unregister_led1_R; 582 } 583 584 led->cdev_led1g.name = "led1_G"; 585 led->cdev_led1g.brightness = LED_OFF; 586 led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness; 587 led->cdev_led1g.blink_set = bd2802_set_led1g_blink; 588 589 ret = led_classdev_register(&led->client->dev, &led->cdev_led1g); 590 if (ret < 0) { 591 dev_err(&led->client->dev, "couldn't register LED %s\n", 592 led->cdev_led1g.name); 593 goto failed_unregister_led1_G; 594 } 595 596 led->cdev_led1b.name = "led1_B"; 597 led->cdev_led1b.brightness = LED_OFF; 598 led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness; 599 led->cdev_led1b.blink_set = bd2802_set_led1b_blink; 600 601 ret = led_classdev_register(&led->client->dev, &led->cdev_led1b); 602 if (ret < 0) { 603 dev_err(&led->client->dev, "couldn't register LED %s\n", 604 led->cdev_led1b.name); 605 goto failed_unregister_led1_B; 606 } 607 608 led->cdev_led2r.name = "led2_R"; 609 led->cdev_led2r.brightness = LED_OFF; 610 led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness; 611 led->cdev_led2r.blink_set = bd2802_set_led2r_blink; 612 613 ret = led_classdev_register(&led->client->dev, &led->cdev_led2r); 614 if (ret < 0) { 615 dev_err(&led->client->dev, "couldn't register LED %s\n", 616 led->cdev_led2r.name); 617 goto failed_unregister_led2_R; 618 } 619 620 led->cdev_led2g.name = "led2_G"; 621 led->cdev_led2g.brightness = LED_OFF; 622 led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness; 623 led->cdev_led2g.blink_set = bd2802_set_led2g_blink; 624 625 ret = led_classdev_register(&led->client->dev, &led->cdev_led2g); 626 if (ret < 0) { 627 dev_err(&led->client->dev, "couldn't register LED %s\n", 628 led->cdev_led2g.name); 629 goto failed_unregister_led2_G; 630 } 631 632 led->cdev_led2b.name = "led2_B"; 633 led->cdev_led2b.brightness = LED_OFF; 634 led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness; 635 led->cdev_led2b.blink_set = bd2802_set_led2b_blink; 636 led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME; 637 638 ret = led_classdev_register(&led->client->dev, &led->cdev_led2b); 639 if (ret < 0) { 640 dev_err(&led->client->dev, "couldn't register LED %s\n", 641 led->cdev_led2b.name); 642 goto failed_unregister_led2_B; 643 } 644 645 return 0; 646 647failed_unregister_led2_B: 648 led_classdev_unregister(&led->cdev_led2g); 649failed_unregister_led2_G: 650 led_classdev_unregister(&led->cdev_led2r); 651failed_unregister_led2_R: 652 led_classdev_unregister(&led->cdev_led1b); 653failed_unregister_led1_B: 654 led_classdev_unregister(&led->cdev_led1g); 655failed_unregister_led1_G: 656 led_classdev_unregister(&led->cdev_led1r); 657failed_unregister_led1_R: 658 659 return ret; 660} 661 662static void bd2802_unregister_led_classdev(struct bd2802_led *led) 663{ 664 cancel_work_sync(&led->work); 665 led_classdev_unregister(&led->cdev_led2b); 666 led_classdev_unregister(&led->cdev_led2g); 667 led_classdev_unregister(&led->cdev_led2r); 668 led_classdev_unregister(&led->cdev_led1b); 669 led_classdev_unregister(&led->cdev_led1g); 670 led_classdev_unregister(&led->cdev_led1r); 671} 672 673static int bd2802_probe(struct i2c_client *client, 674 const struct i2c_device_id *id) 675{ 676 struct bd2802_led *led; 677 struct bd2802_led_platform_data *pdata; 678 int ret, i; 679 680 led = devm_kzalloc(&client->dev, sizeof(struct bd2802_led), GFP_KERNEL); 681 if (!led) 682 return -ENOMEM; 683 684 led->client = client; 685 pdata = led->pdata = dev_get_platdata(&client->dev); 686 i2c_set_clientdata(client, led); 687 688 /* Configure RESET GPIO (L: RESET, H: RESET cancel) */ 689 gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH, "RGB_RESETB"); 690 691 /* Tacss = min 0.1ms */ 692 udelay(100); 693 694 /* Detect BD2802GU */ 695 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00); 696 if (ret < 0) { 697 dev_err(&client->dev, "failed to detect device\n"); 698 return ret; 699 } else 700 dev_info(&client->dev, "return 0x%02x\n", ret); 701 702 /* To save the power, reset BD2802 after detecting */ 703 gpio_set_value(led->pdata->reset_gpio, 0); 704 705 /* Default attributes */ 706 led->wave_pattern = BD2802_PATTERN_HALF; 707 led->rgb_current = BD2802_CURRENT_032; 708 709 init_rwsem(&led->rwsem); 710 711 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) { 712 ret = device_create_file(&led->client->dev, 713 bd2802_attributes[i]); 714 if (ret) { 715 dev_err(&led->client->dev, "failed: sysfs file %s\n", 716 bd2802_attributes[i]->attr.name); 717 goto failed_unregister_dev_file; 718 } 719 } 720 721 ret = bd2802_register_led_classdev(led); 722 if (ret < 0) 723 goto failed_unregister_dev_file; 724 725 return 0; 726 727failed_unregister_dev_file: 728 for (i--; i >= 0; i--) 729 device_remove_file(&led->client->dev, bd2802_attributes[i]); 730 return ret; 731} 732 733static int bd2802_remove(struct i2c_client *client) 734{ 735 struct bd2802_led *led = i2c_get_clientdata(client); 736 int i; 737 738 gpio_set_value(led->pdata->reset_gpio, 0); 739 bd2802_unregister_led_classdev(led); 740 if (led->adf_on) 741 bd2802_disable_adv_conf(led); 742 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) 743 device_remove_file(&led->client->dev, bd2802_attributes[i]); 744 745 return 0; 746} 747 748#ifdef CONFIG_PM_SLEEP 749static void bd2802_restore_state(struct bd2802_led *led) 750{ 751 int i; 752 753 for (i = 0; i < LED_NUM; i++) { 754 if (led->led[i].r) 755 bd2802_turn_on(led, i, RED, led->led[i].r); 756 if (led->led[i].g) 757 bd2802_turn_on(led, i, GREEN, led->led[i].g); 758 if (led->led[i].b) 759 bd2802_turn_on(led, i, BLUE, led->led[i].b); 760 } 761} 762 763static int bd2802_suspend(struct device *dev) 764{ 765 struct i2c_client *client = to_i2c_client(dev); 766 struct bd2802_led *led = i2c_get_clientdata(client); 767 768 gpio_set_value(led->pdata->reset_gpio, 0); 769 770 return 0; 771} 772 773static int bd2802_resume(struct device *dev) 774{ 775 struct i2c_client *client = to_i2c_client(dev); 776 struct bd2802_led *led = i2c_get_clientdata(client); 777 778 if (!bd2802_is_all_off(led) || led->adf_on) { 779 bd2802_reset_cancel(led); 780 bd2802_restore_state(led); 781 } 782 783 return 0; 784} 785#endif 786 787static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume); 788 789static const struct i2c_device_id bd2802_id[] = { 790 { "BD2802", 0 }, 791 { } 792}; 793MODULE_DEVICE_TABLE(i2c, bd2802_id); 794 795static struct i2c_driver bd2802_i2c_driver = { 796 .driver = { 797 .name = "BD2802", 798 .pm = &bd2802_pm, 799 }, 800 .probe = bd2802_probe, 801 .remove = bd2802_remove, 802 .id_table = bd2802_id, 803}; 804 805module_i2c_driver(bd2802_i2c_driver); 806 807MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>"); 808MODULE_DESCRIPTION("BD2802 LED driver"); 809MODULE_LICENSE("GPL v2"); 810