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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 | // SPDX-License-Identifier: GPL-2.0-only /* * leds-bd2802.c - RGB LED Driver * * Copyright (C) 2009 Samsung Electronics * Kim Kyuwon <q1.kim@samsung.com> * * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf */ #include <linux/module.h> #include <linux/i2c.h> #include <linux/gpio/consumer.h> #include <linux/delay.h> #include <linux/leds.h> #include <linux/leds-bd2802.h> #include <linux/slab.h> #include <linux/pm.h> #define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0)) #define BD2802_LED_OFFSET 0xa #define BD2802_COLOR_OFFSET 0x3 #define BD2802_REG_CLKSETUP 0x00 #define BD2802_REG_CONTROL 0x01 #define BD2802_REG_HOURSETUP 0x02 #define BD2802_REG_CURRENT1SETUP 0x03 #define BD2802_REG_CURRENT2SETUP 0x04 #define BD2802_REG_WAVEPATTERN 0x05 #define BD2802_CURRENT_032 0x10 /* 3.2mA */ #define BD2802_CURRENT_000 0x00 /* 0.0mA */ #define BD2802_PATTERN_FULL 0x07 #define BD2802_PATTERN_HALF 0x03 enum led_ids { LED1, LED2, LED_NUM, }; enum led_colors { RED, GREEN, BLUE, }; enum led_bits { BD2802_OFF, BD2802_BLINK, BD2802_ON, }; /* * State '0' : 'off' * State '1' : 'blink' * State '2' : 'on'. */ struct led_state { unsigned r:2; unsigned g:2; unsigned b:2; }; struct bd2802_led { struct bd2802_led_platform_data *pdata; struct i2c_client *client; struct gpio_desc *reset; struct rw_semaphore rwsem; struct led_state led[2]; /* * Making led_classdev as array is not recommended, because array * members prevent using 'container_of' macro. So repetitive works * are needed. */ struct led_classdev cdev_led1r; struct led_classdev cdev_led1g; struct led_classdev cdev_led1b; struct led_classdev cdev_led2r; struct led_classdev cdev_led2g; struct led_classdev cdev_led2b; /* * Advanced Configuration Function(ADF) mode: * In ADF mode, user can set registers of BD2802GU directly, * therefore BD2802GU doesn't enter reset state. */ int adf_on; enum led_ids led_id; enum led_colors color; enum led_bits state; /* General attributes of RGB LEDs */ int wave_pattern; int rgb_current; }; /*--------------------------------------------------------------*/ /* BD2802GU helper functions */ /*--------------------------------------------------------------*/ static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id, enum led_colors color) { switch (color) { case RED: return !led->led[id].r; case GREEN: return !led->led[id].g; case BLUE: return !led->led[id].b; default: dev_err(&led->client->dev, "%s: Invalid color\n", __func__); return -EINVAL; } } static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id) { if (led->led[id].r || led->led[id].g || led->led[id].b) return 0; return 1; } static inline int bd2802_is_all_off(struct bd2802_led *led) { int i; for (i = 0; i < LED_NUM; i++) if (!bd2802_is_led_off(led, i)) return 0; return 1; } static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color) { return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET; } static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color, u8 reg_offset) { return reg_offset + bd2802_get_base_offset(id, color); } /*--------------------------------------------------------------*/ /* BD2802GU core functions */ /*--------------------------------------------------------------*/ static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val) { int ret = i2c_smbus_write_byte_data(client, reg, val); if (ret >= 0) return 0; dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", __func__, reg, val, ret); return ret; } static void bd2802_update_state(struct bd2802_led *led, enum led_ids id, enum led_colors color, enum led_bits led_bit) { int i; u8 value; for (i = 0; i < LED_NUM; i++) { if (i == id) { switch (color) { case RED: led->led[i].r = led_bit; break; case GREEN: led->led[i].g = led_bit; break; case BLUE: led->led[i].b = led_bit; break; default: dev_err(&led->client->dev, "%s: Invalid color\n", __func__); return; } } } if (led_bit == BD2802_BLINK || led_bit == BD2802_ON) return; if (!bd2802_is_led_off(led, id)) return; if (bd2802_is_all_off(led) && !led->adf_on) { gpiod_set_value(led->reset, 1); return; } /* * In this case, other led is turned on, and current led is turned * off. So set RGB LED Control register to stop the current RGB LED */ value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1); bd2802_write_byte(led->client, BD2802_REG_CONTROL, value); } static void bd2802_configure(struct bd2802_led *led) { struct bd2802_led_platform_data *pdata = led->pdata; u8 reg; reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP); bd2802_write_byte(led->client, reg, pdata->rgb_time); reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP); bd2802_write_byte(led->client, reg, pdata->rgb_time); } static void bd2802_reset_cancel(struct bd2802_led *led) { gpiod_set_value(led->reset, 0); udelay(100); bd2802_configure(led); } static void bd2802_enable(struct bd2802_led *led, enum led_ids id) { enum led_ids other_led = (id == LED1) ? LED2 : LED1; u8 value, other_led_on; other_led_on = !bd2802_is_led_off(led, other_led); if (id == LED1) value = LED_CTL(other_led_on, 1); else value = LED_CTL(1 , other_led_on); bd2802_write_byte(led->client, BD2802_REG_CONTROL, value); } static void bd2802_set_on(struct bd2802_led *led, enum led_ids id, enum led_colors color) { u8 reg; if (bd2802_is_all_off(led) && !led->adf_on) bd2802_reset_cancel(led); reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); bd2802_write_byte(led->client, reg, led->rgb_current); reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN); bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL); bd2802_enable(led, id); bd2802_update_state(led, id, color, BD2802_ON); } static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id, enum led_colors color) { u8 reg; if (bd2802_is_all_off(led) && !led->adf_on) bd2802_reset_cancel(led); reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); bd2802_write_byte(led->client, reg, led->rgb_current); reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN); bd2802_write_byte(led->client, reg, led->wave_pattern); bd2802_enable(led, id); bd2802_update_state(led, id, color, BD2802_BLINK); } static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id, enum led_colors color, enum led_bits led_bit) { if (led_bit == BD2802_OFF) { dev_err(&led->client->dev, "Only 'blink' and 'on' are allowed\n"); return; } if (led_bit == BD2802_BLINK) bd2802_set_blink(led, id, color); else bd2802_set_on(led, id, color); } static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id, enum led_colors color) { u8 reg; if (bd2802_is_rgb_off(led, id, color)) return; reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP); bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP); bd2802_write_byte(led->client, reg, BD2802_CURRENT_000); bd2802_update_state(led, id, color, BD2802_OFF); } #define BD2802_SET_REGISTER(reg_addr, reg_name) \ static ssize_t bd2802_store_reg##reg_addr(struct device *dev, \ struct device_attribute *attr, const char *buf, size_t count) \ { \ struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ unsigned long val; \ int ret; \ if (!count) \ return -EINVAL; \ ret = kstrtoul(buf, 16, &val); \ if (ret) \ return ret; \ down_write(&led->rwsem); \ bd2802_write_byte(led->client, reg_addr, (u8) val); \ up_write(&led->rwsem); \ return count; \ } \ static struct device_attribute bd2802_reg##reg_addr##_attr = { \ .attr = {.name = reg_name, .mode = 0644}, \ .store = bd2802_store_reg##reg_addr, \ }; BD2802_SET_REGISTER(0x00, "0x00"); BD2802_SET_REGISTER(0x01, "0x01"); BD2802_SET_REGISTER(0x02, "0x02"); BD2802_SET_REGISTER(0x03, "0x03"); BD2802_SET_REGISTER(0x04, "0x04"); BD2802_SET_REGISTER(0x05, "0x05"); BD2802_SET_REGISTER(0x06, "0x06"); BD2802_SET_REGISTER(0x07, "0x07"); BD2802_SET_REGISTER(0x08, "0x08"); BD2802_SET_REGISTER(0x09, "0x09"); BD2802_SET_REGISTER(0x0a, "0x0a"); BD2802_SET_REGISTER(0x0b, "0x0b"); BD2802_SET_REGISTER(0x0c, "0x0c"); BD2802_SET_REGISTER(0x0d, "0x0d"); BD2802_SET_REGISTER(0x0e, "0x0e"); BD2802_SET_REGISTER(0x0f, "0x0f"); BD2802_SET_REGISTER(0x10, "0x10"); BD2802_SET_REGISTER(0x11, "0x11"); BD2802_SET_REGISTER(0x12, "0x12"); BD2802_SET_REGISTER(0x13, "0x13"); BD2802_SET_REGISTER(0x14, "0x14"); BD2802_SET_REGISTER(0x15, "0x15"); static struct device_attribute *bd2802_addr_attributes[] = { &bd2802_reg0x00_attr, &bd2802_reg0x01_attr, &bd2802_reg0x02_attr, &bd2802_reg0x03_attr, &bd2802_reg0x04_attr, &bd2802_reg0x05_attr, &bd2802_reg0x06_attr, &bd2802_reg0x07_attr, &bd2802_reg0x08_attr, &bd2802_reg0x09_attr, &bd2802_reg0x0a_attr, &bd2802_reg0x0b_attr, &bd2802_reg0x0c_attr, &bd2802_reg0x0d_attr, &bd2802_reg0x0e_attr, &bd2802_reg0x0f_attr, &bd2802_reg0x10_attr, &bd2802_reg0x11_attr, &bd2802_reg0x12_attr, &bd2802_reg0x13_attr, &bd2802_reg0x14_attr, &bd2802_reg0x15_attr, }; static void bd2802_enable_adv_conf(struct bd2802_led *led) { int i, ret; for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) { ret = device_create_file(&led->client->dev, bd2802_addr_attributes[i]); if (ret) { dev_err(&led->client->dev, "failed: sysfs file %s\n", bd2802_addr_attributes[i]->attr.name); goto failed_remove_files; } } if (bd2802_is_all_off(led)) bd2802_reset_cancel(led); led->adf_on = 1; return; failed_remove_files: for (i--; i >= 0; i--) device_remove_file(&led->client->dev, bd2802_addr_attributes[i]); } static void bd2802_disable_adv_conf(struct bd2802_led *led) { int i; for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) device_remove_file(&led->client->dev, bd2802_addr_attributes[i]); if (bd2802_is_all_off(led)) gpiod_set_value(led->reset, 1); led->adf_on = 0; } static ssize_t bd2802_show_adv_conf(struct device *dev, struct device_attribute *attr, char *buf) { struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev)); ssize_t ret; down_read(&led->rwsem); if (led->adf_on) ret = sprintf(buf, "on\n"); else ret = sprintf(buf, "off\n"); up_read(&led->rwsem); return ret; } static ssize_t bd2802_store_adv_conf(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev)); if (!count) return -EINVAL; down_write(&led->rwsem); if (!led->adf_on && !strncmp(buf, "on", 2)) bd2802_enable_adv_conf(led); else if (led->adf_on && !strncmp(buf, "off", 3)) bd2802_disable_adv_conf(led); up_write(&led->rwsem); return count; } static struct device_attribute bd2802_adv_conf_attr = { .attr = { .name = "advanced_configuration", .mode = 0644, }, .show = bd2802_show_adv_conf, .store = bd2802_store_adv_conf, }; #define BD2802_CONTROL_ATTR(attr_name, name_str) \ static ssize_t bd2802_show_##attr_name(struct device *dev, \ struct device_attribute *attr, char *buf) \ { \ struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ ssize_t ret; \ down_read(&led->rwsem); \ ret = sprintf(buf, "0x%02x\n", led->attr_name); \ up_read(&led->rwsem); \ return ret; \ } \ static ssize_t bd2802_store_##attr_name(struct device *dev, \ struct device_attribute *attr, const char *buf, size_t count) \ { \ struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\ unsigned long val; \ int ret; \ if (!count) \ return -EINVAL; \ ret = kstrtoul(buf, 16, &val); \ if (ret) \ return ret; \ down_write(&led->rwsem); \ led->attr_name = val; \ up_write(&led->rwsem); \ return count; \ } \ static struct device_attribute bd2802_##attr_name##_attr = { \ .attr = { \ .name = name_str, \ .mode = 0644, \ }, \ .show = bd2802_show_##attr_name, \ .store = bd2802_store_##attr_name, \ }; BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern"); BD2802_CONTROL_ATTR(rgb_current, "rgb_current"); static struct device_attribute *bd2802_attributes[] = { &bd2802_adv_conf_attr, &bd2802_wave_pattern_attr, &bd2802_rgb_current_attr, }; #define BD2802_CONTROL_RGBS(name, id, clr) \ static int bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\ enum led_brightness value) \ { \ struct bd2802_led *led = \ container_of(led_cdev, struct bd2802_led, cdev_##name); \ led->led_id = id; \ led->color = clr; \ if (value == LED_OFF) { \ led->state = BD2802_OFF; \ bd2802_turn_off(led, led->led_id, led->color); \ } else { \ led->state = BD2802_ON; \ bd2802_turn_on(led, led->led_id, led->color, BD2802_ON);\ } \ return 0; \ } \ static int bd2802_set_##name##_blink(struct led_classdev *led_cdev, \ unsigned long *delay_on, unsigned long *delay_off) \ { \ struct bd2802_led *led = \ container_of(led_cdev, struct bd2802_led, cdev_##name); \ if (*delay_on == 0 || *delay_off == 0) \ return -EINVAL; \ led->led_id = id; \ led->color = clr; \ led->state = BD2802_BLINK; \ bd2802_turn_on(led, led->led_id, led->color, BD2802_BLINK); \ return 0; \ } BD2802_CONTROL_RGBS(led1r, LED1, RED); BD2802_CONTROL_RGBS(led1g, LED1, GREEN); BD2802_CONTROL_RGBS(led1b, LED1, BLUE); BD2802_CONTROL_RGBS(led2r, LED2, RED); BD2802_CONTROL_RGBS(led2g, LED2, GREEN); BD2802_CONTROL_RGBS(led2b, LED2, BLUE); static int bd2802_register_led_classdev(struct bd2802_led *led) { int ret; led->cdev_led1r.name = "led1_R"; led->cdev_led1r.brightness = LED_OFF; led->cdev_led1r.brightness_set_blocking = bd2802_set_led1r_brightness; led->cdev_led1r.blink_set = bd2802_set_led1r_blink; ret = led_classdev_register(&led->client->dev, &led->cdev_led1r); if (ret < 0) { dev_err(&led->client->dev, "couldn't register LED %s\n", led->cdev_led1r.name); goto failed_unregister_led1_R; } led->cdev_led1g.name = "led1_G"; led->cdev_led1g.brightness = LED_OFF; led->cdev_led1g.brightness_set_blocking = bd2802_set_led1g_brightness; led->cdev_led1g.blink_set = bd2802_set_led1g_blink; ret = led_classdev_register(&led->client->dev, &led->cdev_led1g); if (ret < 0) { dev_err(&led->client->dev, "couldn't register LED %s\n", led->cdev_led1g.name); goto failed_unregister_led1_G; } led->cdev_led1b.name = "led1_B"; led->cdev_led1b.brightness = LED_OFF; led->cdev_led1b.brightness_set_blocking = bd2802_set_led1b_brightness; led->cdev_led1b.blink_set = bd2802_set_led1b_blink; ret = led_classdev_register(&led->client->dev, &led->cdev_led1b); if (ret < 0) { dev_err(&led->client->dev, "couldn't register LED %s\n", led->cdev_led1b.name); goto failed_unregister_led1_B; } led->cdev_led2r.name = "led2_R"; led->cdev_led2r.brightness = LED_OFF; led->cdev_led2r.brightness_set_blocking = bd2802_set_led2r_brightness; led->cdev_led2r.blink_set = bd2802_set_led2r_blink; ret = led_classdev_register(&led->client->dev, &led->cdev_led2r); if (ret < 0) { dev_err(&led->client->dev, "couldn't register LED %s\n", led->cdev_led2r.name); goto failed_unregister_led2_R; } led->cdev_led2g.name = "led2_G"; led->cdev_led2g.brightness = LED_OFF; led->cdev_led2g.brightness_set_blocking = bd2802_set_led2g_brightness; led->cdev_led2g.blink_set = bd2802_set_led2g_blink; ret = led_classdev_register(&led->client->dev, &led->cdev_led2g); if (ret < 0) { dev_err(&led->client->dev, "couldn't register LED %s\n", led->cdev_led2g.name); goto failed_unregister_led2_G; } led->cdev_led2b.name = "led2_B"; led->cdev_led2b.brightness = LED_OFF; led->cdev_led2b.brightness_set_blocking = bd2802_set_led2b_brightness; led->cdev_led2b.blink_set = bd2802_set_led2b_blink; led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME; ret = led_classdev_register(&led->client->dev, &led->cdev_led2b); if (ret < 0) { dev_err(&led->client->dev, "couldn't register LED %s\n", led->cdev_led2b.name); goto failed_unregister_led2_B; } return 0; failed_unregister_led2_B: led_classdev_unregister(&led->cdev_led2g); failed_unregister_led2_G: led_classdev_unregister(&led->cdev_led2r); failed_unregister_led2_R: led_classdev_unregister(&led->cdev_led1b); failed_unregister_led1_B: led_classdev_unregister(&led->cdev_led1g); failed_unregister_led1_G: led_classdev_unregister(&led->cdev_led1r); failed_unregister_led1_R: return ret; } static void bd2802_unregister_led_classdev(struct bd2802_led *led) { led_classdev_unregister(&led->cdev_led2b); led_classdev_unregister(&led->cdev_led2g); led_classdev_unregister(&led->cdev_led2r); led_classdev_unregister(&led->cdev_led1b); led_classdev_unregister(&led->cdev_led1g); led_classdev_unregister(&led->cdev_led1r); } static int bd2802_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct bd2802_led *led; int ret, i; led = devm_kzalloc(&client->dev, sizeof(struct bd2802_led), GFP_KERNEL); if (!led) return -ENOMEM; led->client = client; i2c_set_clientdata(client, led); /* * Configure RESET GPIO (L: RESET, H: RESET cancel) * * We request the reset GPIO as OUT_LOW which means de-asserted, * board files specifying this GPIO line in a machine descriptor * table should take care to specify GPIO_ACTIVE_LOW for this line. */ led->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); if (IS_ERR(led->reset)) return PTR_ERR(led->reset); /* Tacss = min 0.1ms */ udelay(100); /* Detect BD2802GU */ ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00); if (ret < 0) { dev_err(&client->dev, "failed to detect device\n"); return ret; } else dev_info(&client->dev, "return 0x%02x\n", ret); /* To save the power, reset BD2802 after detecting */ gpiod_set_value(led->reset, 1); /* Default attributes */ led->wave_pattern = BD2802_PATTERN_HALF; led->rgb_current = BD2802_CURRENT_032; init_rwsem(&led->rwsem); for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) { ret = device_create_file(&led->client->dev, bd2802_attributes[i]); if (ret) { dev_err(&led->client->dev, "failed: sysfs file %s\n", bd2802_attributes[i]->attr.name); goto failed_unregister_dev_file; } } ret = bd2802_register_led_classdev(led); if (ret < 0) goto failed_unregister_dev_file; return 0; failed_unregister_dev_file: for (i--; i >= 0; i--) device_remove_file(&led->client->dev, bd2802_attributes[i]); return ret; } static void bd2802_remove(struct i2c_client *client) { struct bd2802_led *led = i2c_get_clientdata(client); int i; gpiod_set_value(led->reset, 1); bd2802_unregister_led_classdev(led); if (led->adf_on) bd2802_disable_adv_conf(led); for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) device_remove_file(&led->client->dev, bd2802_attributes[i]); } #ifdef CONFIG_PM_SLEEP static void bd2802_restore_state(struct bd2802_led *led) { int i; for (i = 0; i < LED_NUM; i++) { if (led->led[i].r) bd2802_turn_on(led, i, RED, led->led[i].r); if (led->led[i].g) bd2802_turn_on(led, i, GREEN, led->led[i].g); if (led->led[i].b) bd2802_turn_on(led, i, BLUE, led->led[i].b); } } static int bd2802_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct bd2802_led *led = i2c_get_clientdata(client); gpiod_set_value(led->reset, 1); return 0; } static int bd2802_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct bd2802_led *led = i2c_get_clientdata(client); if (!bd2802_is_all_off(led) || led->adf_on) { bd2802_reset_cancel(led); bd2802_restore_state(led); } return 0; } #endif static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume); static const struct i2c_device_id bd2802_id[] = { { "BD2802", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, bd2802_id); static struct i2c_driver bd2802_i2c_driver = { .driver = { .name = "BD2802", .pm = &bd2802_pm, }, .probe = bd2802_probe, .remove = bd2802_remove, .id_table = bd2802_id, }; module_i2c_driver(bd2802_i2c_driver); MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>"); MODULE_DESCRIPTION("BD2802 LED driver"); MODULE_LICENSE("GPL v2"); |