1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * leds-bd2802.c - RGB LED Driver 4 * 5 * Copyright (C) 2009 Samsung Electronics 6 * Kim Kyuwon <q1.kim@samsung.com> 7 * 8 * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf 9 */ 10 11#include <linux/module.h> 12#include <linux/i2c.h> 13#include <linux/gpio/consumer.h> 14#include <linux/delay.h> 15#include <linux/leds.h> 16#include <linux/leds-bd2802.h> 17#include <linux/slab.h> 18#include <linux/pm.h> 19 20#define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0)) 21 22#define BD2802_LED_OFFSET 0xa 23#define BD2802_COLOR_OFFSET 0x3 24 25#define BD2802_REG_CLKSETUP 0x00 26#define BD2802_REG_CONTROL 0x01 27#define BD2802_REG_HOURSETUP 0x02 28#define BD2802_REG_CURRENT1SETUP 0x03 29#define BD2802_REG_CURRENT2SETUP 0x04 30#define BD2802_REG_WAVEPATTERN 0x05 31 32#define BD2802_CURRENT_032 0x10 /* 3.2mA */ 33#define BD2802_CURRENT_000 0x00 /* 0.0mA */ 34 35#define BD2802_PATTERN_FULL 0x07 36#define BD2802_PATTERN_HALF 0x03 37 38enum led_ids { 39 LED1, 40 LED2, 41 LED_NUM, 42}; 43 44enum led_colors { 45 RED, 46 GREEN, 47 BLUE, 48}; 49 50enum led_bits { 51 BD2802_OFF, 52 BD2802_BLINK, 53 BD2802_ON, 54}; 55 56/* 57 * State '0' : 'off' 58 * State '1' : 'blink' 59 * State '2' : 'on'. 60 */ 61struct led_state { 62 unsigned r:2; 63 unsigned g:2; 64 unsigned b:2; 65}; 66 67struct bd2802_led { 68 struct bd2802_led_platform_data *pdata; 69 struct i2c_client *client; 70 struct gpio_desc *reset; 71 struct rw_semaphore rwsem; 72 73 struct led_state led[2]; 74 75 /* 76 * Making led_classdev as array is not recommended, because array 77 * members prevent using 'container_of' macro. So repetitive works 78 * are needed. 79 */ 80 struct led_classdev cdev_led1r; 81 struct led_classdev cdev_led1g; 82 struct led_classdev cdev_led1b; 83 struct led_classdev cdev_led2r; 84 struct led_classdev cdev_led2g; 85 struct led_classdev cdev_led2b; 86 87 /* 88 * Advanced Configuration Function(ADF) mode: 89 * In ADF mode, user can set registers of BD2802GU directly, 90 * therefore BD2802GU doesn't enter reset state. 91 */ 92 int adf_on; 93 94 enum led_ids led_id; 95 enum led_colors color; 96 enum led_bits state; 97 98 /* General attributes of RGB LEDs */ 99 int wave_pattern; 100 int rgb_current; 101}; 102 103 104/*--------------------------------------------------------------*/ 105/* BD2802GU helper functions */ 106/*--------------------------------------------------------------*/ 107 108static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id, 109 enum led_colors color) 110{ 111 switch (color) { 112 case RED: 113 return !led->led[id].r; 114 case GREEN: 115 return !led->led[id].g; 116 case BLUE: 117 return !led->led[id].b; 118 default: 119 dev_err(&led->client->dev, "%s: Invalid color\n", __func__); 120 return -EINVAL; 121 } 122} 123 124static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id) 125{ 126 if (led->led[id].r || led->led[id].g || led->led[id].b) 127 return 0; 128 129 return 1; 130} 131 132static inline int bd2802_is_all_off(struct bd2802_led *led) 133{ 134 int i; 135 136 for (i = 0; i < LED_NUM; i++) 137 if (!bd2802_is_led_off(led, i)) 138 return 0; 139 140 return 1; 141} 142 143static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color) 144{ 145 return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET; 146} 147 148static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color, 149 u8 reg_offset) 150{ 151 return reg_offset + bd2802_get_base_offset(id, color); 152} 153 154 155/*--------------------------------------------------------------*/ 156/* BD2802GU core functions */ 157/*--------------------------------------------------------------*/ 158 159static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val) 160{ 161 int ret = i2c_smbus_write_byte_data(client, reg, val); 162 if (ret >= 0) 163 return 0; 164 165 dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", 166 __func__, reg, val, ret); 167 168 return ret; 169} 170 171static void bd2802_update_state(struct bd2802_led *led, enum led_ids id, 172 enum led_colors color, enum led_bits led_bit) 173{ 174 int i; 175 u8 value; 176 177 for (i = 0; i < LED_NUM; i++) { 178 if (i == id) { 179 switch (color) { 180 case RED: 181 led->led[i].r = led_bit; 182 break; 183 case GREEN: 184 led->led[i].g = led_bit; 185 break; 186 case BLUE: 187 led->led[i].b = led_bit; 188 break; 189 default: 190 dev_err(&led->client->dev, 191 "%s: Invalid color\n", __func__); 192 return; 193 } 194 } 195 } 196 197 if (led_bit == BD2802_BLINK || led_bit == BD2802_ON) 198 return; 199 200 if (!bd2802_is_led_off(led, id)) 201 return; 202 203 if (bd2802_is_all_off(led) && !led->adf_on) { 204 gpiod_set_value(led->reset, 1); 205 return; 206 } 207 208 /* 209 * In this case, other led is turned on, and current led is turned 210 * off. So set RGB LED Control register to stop the current RGB LED 211 */ 212 value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1); 213 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value); 214} 215 216static void bd2802_configure(struct bd2802_led *led) 217{ 218 struct bd2802_led_platform_data *pdata = led->pdata; 219 u8 reg; 220 221 reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP); 222 bd2802_write_byte(led->client, reg, pdata->rgb_time); 223 224 reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP); 225 bd2802_write_byte(led->client, reg, pdata->rgb_time); 226} 227 228static void bd2802_reset_cancel(struct bd2802_led *led) 229{ 230 gpiod_set_value(led->reset, 0); 231 udelay(100); 232 bd2802_configure(led); 233} 234 235static void bd2802_enable(struct bd2802_led *led, enum led_ids id) 236{ 237 enum led_ids other_led = (id == LED1) ? LED2 : LED1; 238 u8 value, other_led_on; 239 240 other_led_on = !bd2802_is_led_off(led, other_led); 241 if (id == LED1) 242 value = LED_CTL(other_led_on, 1); 243 else 244 value = LED_CTL(1 , other_led_on); 245 246 bd2802_write_byte(led->client, BD2802_REG_CONTROL, value); 247} 248 249static void bd2802_set_on(struct bd2802_led *led, enum led_ids id, 250 enum led_colors color) 251{ 252 u8 reg; 253 254 if (bd2802_is_all_off(led) && !led->adf_on) 255 bd2802_reset_cancel(led); 256 257 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); 258 bd2802_write_byte(led->client, reg, led->rgb_current); 259 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); 260 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 261 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN); 262 bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL); 263 264 bd2802_enable(led, id); 265 bd2802_update_state(led, id, color, BD2802_ON); 266} 267 268static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id, 269 enum led_colors color) 270{ 271 u8 reg; 272 273 if (bd2802_is_all_off(led) && !led->adf_on) 274 bd2802_reset_cancel(led); 275 276 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); 277 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 278 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); 279 bd2802_write_byte(led->client, reg, led->rgb_current); 280 reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN); 281 bd2802_write_byte(led->client, reg, led->wave_pattern); 282 283 bd2802_enable(led, id); 284 bd2802_update_state(led, id, color, BD2802_BLINK); 285} 286 287static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id, 288 enum led_colors color, enum led_bits led_bit) 289{ 290 if (led_bit == BD2802_OFF) { 291 dev_err(&led->client->dev, 292 "Only 'blink' and 'on' are allowed\n"); 293 return; 294 } 295 296 if (led_bit == BD2802_BLINK) 297 bd2802_set_blink(led, id, color); 298 else 299 bd2802_set_on(led, id, color); 300} 301 302static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id, 303 enum led_colors color) 304{ 305 u8 reg; 306 307 if (bd2802_is_rgb_off(led, id, color)) 308 return; 309 310 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); 311 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 312 reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); 313 bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); 314 315 bd2802_update_state(led, id, color, BD2802_OFF); 316} 317 318#define BD2802_SET_REGISTER(reg_addr, reg_name) \ 319static ssize_t bd2802_store_reg##reg_addr(struct device *dev, \ 320 struct device_attribute *attr, const char *buf, size_t count) \ 321{ \ 322 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 323 unsigned long val; \ 324 int ret; \ 325 if (!count) \ 326 return -EINVAL; \ 327 ret = kstrtoul(buf, 16, &val); \ 328 if (ret) \ 329 return ret; \ 330 down_write(&led->rwsem); \ 331 bd2802_write_byte(led->client, reg_addr, (u8) val); \ 332 up_write(&led->rwsem); \ 333 return count; \ 334} \ 335static struct device_attribute bd2802_reg##reg_addr##_attr = { \ 336 .attr = {.name = reg_name, .mode = 0644}, \ 337 .store = bd2802_store_reg##reg_addr, \ 338}; 339 340BD2802_SET_REGISTER(0x00, "0x00"); 341BD2802_SET_REGISTER(0x01, "0x01"); 342BD2802_SET_REGISTER(0x02, "0x02"); 343BD2802_SET_REGISTER(0x03, "0x03"); 344BD2802_SET_REGISTER(0x04, "0x04"); 345BD2802_SET_REGISTER(0x05, "0x05"); 346BD2802_SET_REGISTER(0x06, "0x06"); 347BD2802_SET_REGISTER(0x07, "0x07"); 348BD2802_SET_REGISTER(0x08, "0x08"); 349BD2802_SET_REGISTER(0x09, "0x09"); 350BD2802_SET_REGISTER(0x0a, "0x0a"); 351BD2802_SET_REGISTER(0x0b, "0x0b"); 352BD2802_SET_REGISTER(0x0c, "0x0c"); 353BD2802_SET_REGISTER(0x0d, "0x0d"); 354BD2802_SET_REGISTER(0x0e, "0x0e"); 355BD2802_SET_REGISTER(0x0f, "0x0f"); 356BD2802_SET_REGISTER(0x10, "0x10"); 357BD2802_SET_REGISTER(0x11, "0x11"); 358BD2802_SET_REGISTER(0x12, "0x12"); 359BD2802_SET_REGISTER(0x13, "0x13"); 360BD2802_SET_REGISTER(0x14, "0x14"); 361BD2802_SET_REGISTER(0x15, "0x15"); 362 363static struct device_attribute *bd2802_addr_attributes[] = { 364 &bd2802_reg0x00_attr, 365 &bd2802_reg0x01_attr, 366 &bd2802_reg0x02_attr, 367 &bd2802_reg0x03_attr, 368 &bd2802_reg0x04_attr, 369 &bd2802_reg0x05_attr, 370 &bd2802_reg0x06_attr, 371 &bd2802_reg0x07_attr, 372 &bd2802_reg0x08_attr, 373 &bd2802_reg0x09_attr, 374 &bd2802_reg0x0a_attr, 375 &bd2802_reg0x0b_attr, 376 &bd2802_reg0x0c_attr, 377 &bd2802_reg0x0d_attr, 378 &bd2802_reg0x0e_attr, 379 &bd2802_reg0x0f_attr, 380 &bd2802_reg0x10_attr, 381 &bd2802_reg0x11_attr, 382 &bd2802_reg0x12_attr, 383 &bd2802_reg0x13_attr, 384 &bd2802_reg0x14_attr, 385 &bd2802_reg0x15_attr, 386}; 387 388static void bd2802_enable_adv_conf(struct bd2802_led *led) 389{ 390 int i, ret; 391 392 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) { 393 ret = device_create_file(&led->client->dev, 394 bd2802_addr_attributes[i]); 395 if (ret) { 396 dev_err(&led->client->dev, "failed: sysfs file %s\n", 397 bd2802_addr_attributes[i]->attr.name); 398 goto failed_remove_files; 399 } 400 } 401 402 if (bd2802_is_all_off(led)) 403 bd2802_reset_cancel(led); 404 405 led->adf_on = 1; 406 407 return; 408 409failed_remove_files: 410 for (i--; i >= 0; i--) 411 device_remove_file(&led->client->dev, 412 bd2802_addr_attributes[i]); 413} 414 415static void bd2802_disable_adv_conf(struct bd2802_led *led) 416{ 417 int i; 418 419 for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) 420 device_remove_file(&led->client->dev, 421 bd2802_addr_attributes[i]); 422 423 if (bd2802_is_all_off(led)) 424 gpiod_set_value(led->reset, 1); 425 426 led->adf_on = 0; 427} 428 429static ssize_t bd2802_show_adv_conf(struct device *dev, 430 struct device_attribute *attr, char *buf) 431{ 432 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev)); 433 ssize_t ret; 434 435 down_read(&led->rwsem); 436 if (led->adf_on) 437 ret = sprintf(buf, "on\n"); 438 else 439 ret = sprintf(buf, "off\n"); 440 up_read(&led->rwsem); 441 442 return ret; 443} 444 445static ssize_t bd2802_store_adv_conf(struct device *dev, 446 struct device_attribute *attr, const char *buf, size_t count) 447{ 448 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev)); 449 450 if (!count) 451 return -EINVAL; 452 453 down_write(&led->rwsem); 454 if (!led->adf_on && !strncmp(buf, "on", 2)) 455 bd2802_enable_adv_conf(led); 456 else if (led->adf_on && !strncmp(buf, "off", 3)) 457 bd2802_disable_adv_conf(led); 458 up_write(&led->rwsem); 459 460 return count; 461} 462 463static struct device_attribute bd2802_adv_conf_attr = { 464 .attr = { 465 .name = "advanced_configuration", 466 .mode = 0644, 467 }, 468 .show = bd2802_show_adv_conf, 469 .store = bd2802_store_adv_conf, 470}; 471 472#define BD2802_CONTROL_ATTR(attr_name, name_str) \ 473static ssize_t bd2802_show_##attr_name(struct device *dev, \ 474 struct device_attribute *attr, char *buf) \ 475{ \ 476 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 477 ssize_t ret; \ 478 down_read(&led->rwsem); \ 479 ret = sprintf(buf, "0x%02x\n", led->attr_name); \ 480 up_read(&led->rwsem); \ 481 return ret; \ 482} \ 483static ssize_t bd2802_store_##attr_name(struct device *dev, \ 484 struct device_attribute *attr, const char *buf, size_t count) \ 485{ \ 486 struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ 487 unsigned long val; \ 488 int ret; \ 489 if (!count) \ 490 return -EINVAL; \ 491 ret = kstrtoul(buf, 16, &val); \ 492 if (ret) \ 493 return ret; \ 494 down_write(&led->rwsem); \ 495 led->attr_name = val; \ 496 up_write(&led->rwsem); \ 497 return count; \ 498} \ 499static struct device_attribute bd2802_##attr_name##_attr = { \ 500 .attr = { \ 501 .name = name_str, \ 502 .mode = 0644, \ 503 }, \ 504 .show = bd2802_show_##attr_name, \ 505 .store = bd2802_store_##attr_name, \ 506}; 507 508BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern"); 509BD2802_CONTROL_ATTR(rgb_current, "rgb_current"); 510 511static struct device_attribute *bd2802_attributes[] = { 512 &bd2802_adv_conf_attr, 513 &bd2802_wave_pattern_attr, 514 &bd2802_rgb_current_attr, 515}; 516 517#define BD2802_CONTROL_RGBS(name, id, clr) \ 518static int bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\ 519 enum led_brightness value) \ 520{ \ 521 struct bd2802_led *led = \ 522 container_of(led_cdev, struct bd2802_led, cdev_##name); \ 523 led->led_id = id; \ 524 led->color = clr; \ 525 if (value == LED_OFF) { \ 526 led->state = BD2802_OFF; \ 527 bd2802_turn_off(led, led->led_id, led->color); \ 528 } else { \ 529 led->state = BD2802_ON; \ 530 bd2802_turn_on(led, led->led_id, led->color, BD2802_ON);\ 531 } \ 532 return 0; \ 533} \ 534static int bd2802_set_##name##_blink(struct led_classdev *led_cdev, \ 535 unsigned long *delay_on, unsigned long *delay_off) \ 536{ \ 537 struct bd2802_led *led = \ 538 container_of(led_cdev, struct bd2802_led, cdev_##name); \ 539 if (*delay_on == 0 || *delay_off == 0) \ 540 return -EINVAL; \ 541 led->led_id = id; \ 542 led->color = clr; \ 543 led->state = BD2802_BLINK; \ 544 bd2802_turn_on(led, led->led_id, led->color, BD2802_BLINK); \ 545 return 0; \ 546} 547 548BD2802_CONTROL_RGBS(led1r, LED1, RED); 549BD2802_CONTROL_RGBS(led1g, LED1, GREEN); 550BD2802_CONTROL_RGBS(led1b, LED1, BLUE); 551BD2802_CONTROL_RGBS(led2r, LED2, RED); 552BD2802_CONTROL_RGBS(led2g, LED2, GREEN); 553BD2802_CONTROL_RGBS(led2b, LED2, BLUE); 554 555static int bd2802_register_led_classdev(struct bd2802_led *led) 556{ 557 int ret; 558 559 led->cdev_led1r.name = "led1_R"; 560 led->cdev_led1r.brightness = LED_OFF; 561 led->cdev_led1r.brightness_set_blocking = bd2802_set_led1r_brightness; 562 led->cdev_led1r.blink_set = bd2802_set_led1r_blink; 563 564 ret = led_classdev_register(&led->client->dev, &led->cdev_led1r); 565 if (ret < 0) { 566 dev_err(&led->client->dev, "couldn't register LED %s\n", 567 led->cdev_led1r.name); 568 goto failed_unregister_led1_R; 569 } 570 571 led->cdev_led1g.name = "led1_G"; 572 led->cdev_led1g.brightness = LED_OFF; 573 led->cdev_led1g.brightness_set_blocking = bd2802_set_led1g_brightness; 574 led->cdev_led1g.blink_set = bd2802_set_led1g_blink; 575 576 ret = led_classdev_register(&led->client->dev, &led->cdev_led1g); 577 if (ret < 0) { 578 dev_err(&led->client->dev, "couldn't register LED %s\n", 579 led->cdev_led1g.name); 580 goto failed_unregister_led1_G; 581 } 582 583 led->cdev_led1b.name = "led1_B"; 584 led->cdev_led1b.brightness = LED_OFF; 585 led->cdev_led1b.brightness_set_blocking = bd2802_set_led1b_brightness; 586 led->cdev_led1b.blink_set = bd2802_set_led1b_blink; 587 588 ret = led_classdev_register(&led->client->dev, &led->cdev_led1b); 589 if (ret < 0) { 590 dev_err(&led->client->dev, "couldn't register LED %s\n", 591 led->cdev_led1b.name); 592 goto failed_unregister_led1_B; 593 } 594 595 led->cdev_led2r.name = "led2_R"; 596 led->cdev_led2r.brightness = LED_OFF; 597 led->cdev_led2r.brightness_set_blocking = bd2802_set_led2r_brightness; 598 led->cdev_led2r.blink_set = bd2802_set_led2r_blink; 599 600 ret = led_classdev_register(&led->client->dev, &led->cdev_led2r); 601 if (ret < 0) { 602 dev_err(&led->client->dev, "couldn't register LED %s\n", 603 led->cdev_led2r.name); 604 goto failed_unregister_led2_R; 605 } 606 607 led->cdev_led2g.name = "led2_G"; 608 led->cdev_led2g.brightness = LED_OFF; 609 led->cdev_led2g.brightness_set_blocking = bd2802_set_led2g_brightness; 610 led->cdev_led2g.blink_set = bd2802_set_led2g_blink; 611 612 ret = led_classdev_register(&led->client->dev, &led->cdev_led2g); 613 if (ret < 0) { 614 dev_err(&led->client->dev, "couldn't register LED %s\n", 615 led->cdev_led2g.name); 616 goto failed_unregister_led2_G; 617 } 618 619 led->cdev_led2b.name = "led2_B"; 620 led->cdev_led2b.brightness = LED_OFF; 621 led->cdev_led2b.brightness_set_blocking = bd2802_set_led2b_brightness; 622 led->cdev_led2b.blink_set = bd2802_set_led2b_blink; 623 led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME; 624 625 ret = led_classdev_register(&led->client->dev, &led->cdev_led2b); 626 if (ret < 0) { 627 dev_err(&led->client->dev, "couldn't register LED %s\n", 628 led->cdev_led2b.name); 629 goto failed_unregister_led2_B; 630 } 631 632 return 0; 633 634failed_unregister_led2_B: 635 led_classdev_unregister(&led->cdev_led2g); 636failed_unregister_led2_G: 637 led_classdev_unregister(&led->cdev_led2r); 638failed_unregister_led2_R: 639 led_classdev_unregister(&led->cdev_led1b); 640failed_unregister_led1_B: 641 led_classdev_unregister(&led->cdev_led1g); 642failed_unregister_led1_G: 643 led_classdev_unregister(&led->cdev_led1r); 644failed_unregister_led1_R: 645 646 return ret; 647} 648 649static void bd2802_unregister_led_classdev(struct bd2802_led *led) 650{ 651 led_classdev_unregister(&led->cdev_led2b); 652 led_classdev_unregister(&led->cdev_led2g); 653 led_classdev_unregister(&led->cdev_led2r); 654 led_classdev_unregister(&led->cdev_led1b); 655 led_classdev_unregister(&led->cdev_led1g); 656 led_classdev_unregister(&led->cdev_led1r); 657} 658 659static int bd2802_probe(struct i2c_client *client) 660{ 661 struct bd2802_led *led; 662 int ret, i; 663 664 led = devm_kzalloc(&client->dev, sizeof(struct bd2802_led), GFP_KERNEL); 665 if (!led) 666 return -ENOMEM; 667 668 led->client = client; 669 i2c_set_clientdata(client, led); 670 671 /* 672 * Configure RESET GPIO (L: RESET, H: RESET cancel) 673 * 674 * We request the reset GPIO as OUT_LOW which means de-asserted, 675 * board files specifying this GPIO line in a machine descriptor 676 * table should take care to specify GPIO_ACTIVE_LOW for this line. 677 */ 678 led->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); 679 if (IS_ERR(led->reset)) 680 return PTR_ERR(led->reset); 681 682 /* Tacss = min 0.1ms */ 683 udelay(100); 684 685 /* Detect BD2802GU */ 686 ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00); 687 if (ret < 0) { 688 dev_err(&client->dev, "failed to detect device\n"); 689 return ret; 690 } else 691 dev_info(&client->dev, "return 0x%02x\n", ret); 692 693 /* To save the power, reset BD2802 after detecting */ 694 gpiod_set_value(led->reset, 1); 695 696 /* Default attributes */ 697 led->wave_pattern = BD2802_PATTERN_HALF; 698 led->rgb_current = BD2802_CURRENT_032; 699 700 init_rwsem(&led->rwsem); 701 702 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) { 703 ret = device_create_file(&led->client->dev, 704 bd2802_attributes[i]); 705 if (ret) { 706 dev_err(&led->client->dev, "failed: sysfs file %s\n", 707 bd2802_attributes[i]->attr.name); 708 goto failed_unregister_dev_file; 709 } 710 } 711 712 ret = bd2802_register_led_classdev(led); 713 if (ret < 0) 714 goto failed_unregister_dev_file; 715 716 return 0; 717 718failed_unregister_dev_file: 719 for (i--; i >= 0; i--) 720 device_remove_file(&led->client->dev, bd2802_attributes[i]); 721 return ret; 722} 723 724static void bd2802_remove(struct i2c_client *client) 725{ 726 struct bd2802_led *led = i2c_get_clientdata(client); 727 int i; 728 729 gpiod_set_value(led->reset, 1); 730 bd2802_unregister_led_classdev(led); 731 if (led->adf_on) 732 bd2802_disable_adv_conf(led); 733 for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) 734 device_remove_file(&led->client->dev, bd2802_attributes[i]); 735} 736 737#ifdef CONFIG_PM_SLEEP 738static 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 752static 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 gpiod_set_value(led->reset, 1); 758 759 return 0; 760} 761 762static 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 776static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume); 777 778static const struct i2c_device_id bd2802_id[] = { 779 { "BD2802", 0 }, 780 { } 781}; 782MODULE_DEVICE_TABLE(i2c, bd2802_id); 783 784static 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 794module_i2c_driver(bd2802_i2c_driver); 795 796MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>"); 797MODULE_DESCRIPTION("BD2802 LED driver"); 798MODULE_LICENSE("GPL v2"); 799