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