drivers/video/backlight/ld9040.c

   1 /*
   2  * ld9040 AMOLED LCD panel driver.
   3  *
   4  * Copyright (c) 2011 Samsung Electronics
   5  * Author: Donghwa Lee  <dh09.lee@samsung.com>
   6  * Derived from drivers/video/backlight/s6e63m0.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2 of the License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/backlight.h>
  15 #include <linux/delay.h>
  16 #include <linux/fb.h>
  17 #include <linux/gpio.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/irq.h>
  20 #include <linux/kernel.h>
  21 #include <linux/lcd.h>
  22 #include <linux/module.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/spi/spi.h>
  25 #include <linux/wait.h>
  26
  27 #include "ld9040_gamma.h"
  28
  29 #define SLEEPMSEC               0x1000
  30 #define ENDDEF                  0x2000
  31 #define DEFMASK                 0xFF00
  32 #define COMMAND_ONLY            0xFE
  33 #define DATA_ONLY               0xFF
  34
  35 #define MIN_BRIGHTNESS          0
  36 #define MAX_BRIGHTNESS          24
  37
  38 struct ld9040 {
  39         struct device                   *dev;
  40         struct spi_device               *spi;
  41         unsigned int                    power;
  42         unsigned int                    current_brightness;
  43
  44         struct lcd_device               *ld;
  45         struct backlight_device         *bd;
  46         struct lcd_platform_data        *lcd_pd;
  47
  48         struct mutex                    lock;
  49         bool  enabled;
  50 };
  51
  52 static struct regulator_bulk_data supplies[] = {
  53         { .supply = "vdd3", },
  54         { .supply = "vci", },
  55 };
  56
  57 static void ld9040_regulator_enable(struct ld9040 *lcd)
  58 {
  59         int ret = 0;
  60         struct lcd_platform_data *pd = NULL;
  61
  62         pd = lcd->lcd_pd;
  63         mutex_lock(&lcd->lock);
  64         if (!lcd->enabled) {
  65                 ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);
  66                 if (ret)
  67                         goto out;
  68
  69                 lcd->enabled = true;
  70         }
  71         msleep(pd->power_on_delay);
  72 out:
  73         mutex_unlock(&lcd->lock);
  74 }
  75
  76 static void ld9040_regulator_disable(struct ld9040 *lcd)
  77 {
  78         int ret = 0;
  79
  80         mutex_lock(&lcd->lock);
  81         if (lcd->enabled) {
  82                 ret = regulator_bulk_disable(ARRAY_SIZE(supplies), supplies);
  83                 if (ret)
  84                         goto out;
  85
  86                 lcd->enabled = false;
  87         }
  88 out:
  89         mutex_unlock(&lcd->lock);
  90 }
  91
  92 static const unsigned short seq_swreset[] = {
  93         0x01, COMMAND_ONLY,
  94         ENDDEF, 0x00
  95 };
  96
  97 static const unsigned short seq_user_setting[] = {
  98         0xF0, 0x5A,
  99
 100         DATA_ONLY, 0x5A,
 101         ENDDEF, 0x00
 102 };
 103
 104 static const unsigned short seq_elvss_on[] = {
 105         0xB1, 0x0D,
 106
 107         DATA_ONLY, 0x00,
 108         DATA_ONLY, 0x16,
 109         ENDDEF, 0x00
 110 };
 111
 112 static const unsigned short seq_gtcon[] = {
 113         0xF7, 0x09,
 114
 115         DATA_ONLY, 0x00,
 116         DATA_ONLY, 0x00,
 117         ENDDEF, 0x00
 118 };
 119
 120 static const unsigned short seq_panel_condition[] = {
 121         0xF8, 0x05,
 122
 123         DATA_ONLY, 0x65,
 124         DATA_ONLY, 0x96,
 125         DATA_ONLY, 0x71,
 126         DATA_ONLY, 0x7D,
 127         DATA_ONLY, 0x19,
 128         DATA_ONLY, 0x3B,
 129         DATA_ONLY, 0x0D,
 130         DATA_ONLY, 0x19,
 131         DATA_ONLY, 0x7E,
 132         DATA_ONLY, 0x0D,
 133         DATA_ONLY, 0xE2,
 134         DATA_ONLY, 0x00,
 135         DATA_ONLY, 0x00,
 136         DATA_ONLY, 0x7E,
 137         DATA_ONLY, 0x7D,
 138         DATA_ONLY, 0x07,
 139         DATA_ONLY, 0x07,
 140         DATA_ONLY, 0x20,
 141         DATA_ONLY, 0x20,
 142         DATA_ONLY, 0x20,
 143         DATA_ONLY, 0x02,
 144         DATA_ONLY, 0x02,
 145         ENDDEF, 0x00
 146 };
 147
 148 static const unsigned short seq_gamma_set1[] = {
 149         0xF9, 0x00,
 150
 151         DATA_ONLY, 0xA7,
 152         DATA_ONLY, 0xB4,
 153         DATA_ONLY, 0xAE,
 154         DATA_ONLY, 0xBF,
 155         DATA_ONLY, 0x00,
 156         DATA_ONLY, 0x91,
 157         DATA_ONLY, 0x00,
 158         DATA_ONLY, 0xB2,
 159         DATA_ONLY, 0xB4,
 160         DATA_ONLY, 0xAA,
 161         DATA_ONLY, 0xBB,
 162         DATA_ONLY, 0x00,
 163         DATA_ONLY, 0xAC,
 164         DATA_ONLY, 0x00,
 165         DATA_ONLY, 0xB3,
 166         DATA_ONLY, 0xB1,
 167         DATA_ONLY, 0xAA,
 168         DATA_ONLY, 0xBC,
 169         DATA_ONLY, 0x00,
 170         DATA_ONLY, 0xB3,
 171         ENDDEF, 0x00
 172 };
 173
 174 static const unsigned short seq_gamma_ctrl[] = {
 175         0xFB, 0x02,
 176
 177         DATA_ONLY, 0x5A,
 178         ENDDEF, 0x00
 179 };
 180
 181 static const unsigned short seq_gamma_start[] = {
 182         0xF9, COMMAND_ONLY,
 183
 184         ENDDEF, 0x00
 185 };
 186
 187 static const unsigned short seq_apon[] = {
 188         0xF3, 0x00,
 189
 190         DATA_ONLY, 0x00,
 191         DATA_ONLY, 0x00,
 192         DATA_ONLY, 0x0A,
 193         DATA_ONLY, 0x02,
 194         ENDDEF, 0x00
 195 };
 196
 197 static const unsigned short seq_display_ctrl[] = {
 198         0xF2, 0x02,
 199
 200         DATA_ONLY, 0x08,
 201         DATA_ONLY, 0x08,
 202         DATA_ONLY, 0x10,
 203         DATA_ONLY, 0x10,
 204         ENDDEF, 0x00
 205 };
 206
 207 static const unsigned short seq_manual_pwr[] = {
 208         0xB0, 0x04,
 209         ENDDEF, 0x00
 210 };
 211
 212 static const unsigned short seq_pwr_ctrl[] = {
 213         0xF4, 0x0A,
 214
 215         DATA_ONLY, 0x87,
 216         DATA_ONLY, 0x25,
 217         DATA_ONLY, 0x6A,
 218         DATA_ONLY, 0x44,
 219         DATA_ONLY, 0x02,
 220         DATA_ONLY, 0x88,
 221         ENDDEF, 0x00
 222 };
 223
 224 static const unsigned short seq_sleep_out[] = {
 225         0x11, COMMAND_ONLY,
 226         ENDDEF, 0x00
 227 };
 228
 229 static const unsigned short seq_sleep_in[] = {
 230         0x10, COMMAND_ONLY,
 231         ENDDEF, 0x00
 232 };
 233
 234 static const unsigned short seq_display_on[] = {
 235         0x29, COMMAND_ONLY,
 236         ENDDEF, 0x00
 237 };
 238
 239 static const unsigned short seq_display_off[] = {
 240         0x28, COMMAND_ONLY,
 241         ENDDEF, 0x00
 242 };
 243
 244 static const unsigned short seq_vci1_1st_en[] = {
 245         0xF3, 0x10,
 246
 247         DATA_ONLY, 0x00,
 248         DATA_ONLY, 0x00,
 249         DATA_ONLY, 0x00,
 250         DATA_ONLY, 0x02,
 251         ENDDEF, 0x00
 252 };
 253
 254 static const unsigned short seq_vl1_en[] = {
 255         0xF3, 0x11,
 256
 257         DATA_ONLY, 0x00,
 258         DATA_ONLY, 0x00,
 259         DATA_ONLY, 0x00,
 260         DATA_ONLY, 0x02,
 261         ENDDEF, 0x00
 262 };
 263
 264 static const unsigned short seq_vl2_en[] = {
 265         0xF3, 0x13,
 266
 267         DATA_ONLY, 0x00,
 268         DATA_ONLY, 0x00,
 269         DATA_ONLY, 0x00,
 270         DATA_ONLY, 0x02,
 271         ENDDEF, 0x00
 272 };
 273
 274 static const unsigned short seq_vci1_2nd_en[] = {
 275         0xF3, 0x33,
 276
 277         DATA_ONLY, 0x00,
 278         DATA_ONLY, 0x00,
 279         DATA_ONLY, 0x00,
 280         DATA_ONLY, 0x02,
 281         ENDDEF, 0x00
 282 };
 283
 284 static const unsigned short seq_vl3_en[] = {
 285         0xF3, 0x37,
 286
 287         DATA_ONLY, 0x00,
 288         DATA_ONLY, 0x00,
 289         DATA_ONLY, 0x00,
 290         DATA_ONLY, 0x02,
 291         ENDDEF, 0x00
 292 };
 293
 294 static const unsigned short seq_vreg1_amp_en[] = {
 295         0xF3, 0x37,
 296
 297         DATA_ONLY, 0x01,
 298         DATA_ONLY, 0x00,
 299         DATA_ONLY, 0x00,
 300         DATA_ONLY, 0x02,
 301         ENDDEF, 0x00
 302 };
 303
 304 static const unsigned short seq_vgh_amp_en[] = {
 305         0xF3, 0x37,
 306
 307         DATA_ONLY, 0x11,
 308         DATA_ONLY, 0x00,
 309         DATA_ONLY, 0x00,
 310         DATA_ONLY, 0x02,
 311         ENDDEF, 0x00
 312 };
 313
 314 static const unsigned short seq_vgl_amp_en[] = {
 315         0xF3, 0x37,
 316
 317         DATA_ONLY, 0x31,
 318         DATA_ONLY, 0x00,
 319         DATA_ONLY, 0x00,
 320         DATA_ONLY, 0x02,
 321         ENDDEF, 0x00
 322 };
 323
 324 static const unsigned short seq_vmos_amp_en[] = {
 325         0xF3, 0x37,
 326
 327         DATA_ONLY, 0xB1,
 328         DATA_ONLY, 0x00,
 329         DATA_ONLY, 0x00,
 330         DATA_ONLY, 0x03,
 331         ENDDEF, 0x00
 332 };
 333
 334 static const unsigned short seq_vint_amp_en[] = {
 335         0xF3, 0x37,
 336
 337         DATA_ONLY, 0xF1,
 338         /* DATA_ONLY, 0x71,     VMOS/VBL/VBH not used */
 339         DATA_ONLY, 0x00,
 340         DATA_ONLY, 0x00,
 341         DATA_ONLY, 0x03,
 342         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 343         ENDDEF, 0x00
 344 };
 345
 346 static const unsigned short seq_vbh_amp_en[] = {
 347         0xF3, 0x37,
 348
 349         DATA_ONLY, 0xF9,
 350         DATA_ONLY, 0x00,
 351         DATA_ONLY, 0x00,
 352         DATA_ONLY, 0x03,
 353         ENDDEF, 0x00
 354 };
 355
 356 static const unsigned short seq_vbl_amp_en[] = {
 357         0xF3, 0x37,
 358
 359         DATA_ONLY, 0xFD,
 360         DATA_ONLY, 0x00,
 361         DATA_ONLY, 0x00,
 362         DATA_ONLY, 0x03,
 363         ENDDEF, 0x00
 364 };
 365
 366 static const unsigned short seq_gam_amp_en[] = {
 367         0xF3, 0x37,
 368
 369         DATA_ONLY, 0xFF,
 370         /* DATA_ONLY, 0x73,     VMOS/VBL/VBH not used */
 371         DATA_ONLY, 0x00,
 372         DATA_ONLY, 0x00,
 373         DATA_ONLY, 0x03,
 374         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 375         ENDDEF, 0x00
 376 };
 377
 378 static const unsigned short seq_sd_amp_en[] = {
 379         0xF3, 0x37,
 380
 381         DATA_ONLY, 0xFF,
 382         /* DATA_ONLY, 0x73,     VMOS/VBL/VBH not used */
 383         DATA_ONLY, 0x80,
 384         DATA_ONLY, 0x00,
 385         DATA_ONLY, 0x03,
 386         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 387         ENDDEF, 0x00
 388 };
 389
 390 static const unsigned short seq_gls_en[] = {
 391         0xF3, 0x37,
 392
 393         DATA_ONLY, 0xFF,
 394         /* DATA_ONLY, 0x73,     VMOS/VBL/VBH not used */
 395         DATA_ONLY, 0x81,
 396         DATA_ONLY, 0x00,
 397         DATA_ONLY, 0x03,
 398         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 399         ENDDEF, 0x00
 400 };
 401
 402 static const unsigned short seq_els_en[] = {
 403         0xF3, 0x37,
 404
 405         DATA_ONLY, 0xFF,
 406         /* DATA_ONLY, 0x73,     VMOS/VBL/VBH not used */
 407         DATA_ONLY, 0x83,
 408         DATA_ONLY, 0x00,
 409         DATA_ONLY, 0x03,
 410         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 411         ENDDEF, 0x00
 412 };
 413
 414 static const unsigned short seq_el_on[] = {
 415         0xF3, 0x37,
 416
 417         DATA_ONLY, 0xFF,
 418         /* DATA_ONLY, 0x73,     VMOS/VBL/VBH not used */
 419         DATA_ONLY, 0x87,
 420         DATA_ONLY, 0x00,
 421         DATA_ONLY, 0x03,
 422         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 423         ENDDEF, 0x00
 424 };
 425
 426 static int ld9040_spi_write_byte(struct ld9040 *lcd, int addr, int data)
 427 {
 428         u16 buf[1];
 429         struct spi_message msg;
 430
 431         struct spi_transfer xfer = {
 432                 .len            = 2,
 433                 .tx_buf         = buf,
 434         };
 435
 436         buf[0] = (addr << 8) | data;
 437
 438         spi_message_init(&msg);
 439         spi_message_add_tail(&xfer, &msg);
 440
 441         return spi_sync(lcd->spi, &msg);
 442 }
 443
 444 static int ld9040_spi_write(struct ld9040 *lcd, unsigned char address,
 445         unsigned char command)
 446 {
 447         int ret = 0;
 448
 449         if (address != DATA_ONLY)
 450                 ret = ld9040_spi_write_byte(lcd, 0x0, address);
 451         if (command != COMMAND_ONLY)
 452                 ret = ld9040_spi_write_byte(lcd, 0x1, command);
 453
 454         return ret;
 455 }
 456
 457 static int ld9040_panel_send_sequence(struct ld9040 *lcd,
 458         const unsigned short *wbuf)
 459 {
 460         int ret = 0, i = 0;
 461
 462         while ((wbuf[i] & DEFMASK) != ENDDEF) {
 463                 if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
 464                         ret = ld9040_spi_write(lcd, wbuf[i], wbuf[i+1]);
 465                         if (ret)
 466                                 break;
 467                 } else {
 468                         msleep(wbuf[i+1]);
 469                 }
 470                 i += 2;
 471         }
 472
 473         return ret;
 474 }
 475
 476 static int _ld9040_gamma_ctl(struct ld9040 *lcd, const unsigned int *gamma)
 477 {
 478         unsigned int i = 0;
 479         int ret = 0;
 480
 481         /* start gamma table updating. */
 482         ret = ld9040_panel_send_sequence(lcd, seq_gamma_start);
 483         if (ret) {
 484                 dev_err(lcd->dev, "failed to disable gamma table updating.\n");
 485                 goto gamma_err;
 486         }
 487
 488         for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
 489                 ret = ld9040_spi_write(lcd, DATA_ONLY, gamma[i]);
 490                 if (ret) {
 491                         dev_err(lcd->dev, "failed to set gamma table.\n");
 492                         goto gamma_err;
 493                 }
 494         }
 495
 496         /* update gamma table. */
 497         ret = ld9040_panel_send_sequence(lcd, seq_gamma_ctrl);
 498         if (ret)
 499                 dev_err(lcd->dev, "failed to update gamma table.\n");
 500
 501 gamma_err:
 502         return ret;
 503 }
 504
 505 static int ld9040_gamma_ctl(struct ld9040 *lcd, int gamma)
 506 {
 507         return _ld9040_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
 508 }
 509
 510 static int ld9040_ldi_init(struct ld9040 *lcd)
 511 {
 512         int ret, i;
 513         static const unsigned short *init_seq[] = {
 514                 seq_user_setting,
 515                 seq_panel_condition,
 516                 seq_display_ctrl,
 517                 seq_manual_pwr,
 518                 seq_elvss_on,
 519                 seq_gtcon,
 520                 seq_gamma_set1,
 521                 seq_gamma_ctrl,
 522                 seq_sleep_out,
 523         };
 524
 525         for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
 526                 ret = ld9040_panel_send_sequence(lcd, init_seq[i]);
 527                 /* workaround: minimum delay time for transferring CMD */
 528                 usleep_range(300, 310);
 529                 if (ret)
 530                         break;
 531         }
 532
 533         return ret;
 534 }
 535
 536 static int ld9040_ldi_enable(struct ld9040 *lcd)
 537 {
 538         return ld9040_panel_send_sequence(lcd, seq_display_on);
 539 }
 540
 541 static int ld9040_ldi_disable(struct ld9040 *lcd)
 542 {
 543         int ret;
 544
 545         ret = ld9040_panel_send_sequence(lcd, seq_display_off);
 546         ret = ld9040_panel_send_sequence(lcd, seq_sleep_in);
 547
 548         return ret;
 549 }
 550
 551 static int ld9040_power_is_on(int power)
 552 {
 553         return power <= FB_BLANK_NORMAL;
 554 }
 555
 556 static int ld9040_power_on(struct ld9040 *lcd)
 557 {
 558         int ret = 0;
 559         struct lcd_platform_data *pd;
 560
 561         pd = lcd->lcd_pd;
 562
 563         /* lcd power on */
 564         ld9040_regulator_enable(lcd);
 565
 566         if (!pd->reset) {
 567                 dev_err(lcd->dev, "reset is NULL.\n");
 568                 return -EINVAL;
 569         }
 570
 571         pd->reset(lcd->ld);
 572         msleep(pd->reset_delay);
 573
 574         ret = ld9040_ldi_init(lcd);
 575         if (ret) {
 576                 dev_err(lcd->dev, "failed to initialize ldi.\n");
 577                 return ret;
 578         }
 579
 580         ret = ld9040_ldi_enable(lcd);
 581         if (ret) {
 582                 dev_err(lcd->dev, "failed to enable ldi.\n");
 583                 return ret;
 584         }
 585
 586         return 0;
 587 }
 588
 589 static int ld9040_power_off(struct ld9040 *lcd)
 590 {
 591         int ret;
 592         struct lcd_platform_data *pd;
 593
 594         pd = lcd->lcd_pd;
 595
 596         ret = ld9040_ldi_disable(lcd);
 597         if (ret) {
 598                 dev_err(lcd->dev, "lcd setting failed.\n");
 599                 return -EIO;
 600         }
 601
 602         msleep(pd->power_off_delay);
 603
 604         /* lcd power off */
 605         ld9040_regulator_disable(lcd);
 606
 607         return 0;
 608 }
 609
 610 static int ld9040_power(struct ld9040 *lcd, int power)
 611 {
 612         int ret = 0;
 613
 614         if (ld9040_power_is_on(power) && !ld9040_power_is_on(lcd->power))
 615                 ret = ld9040_power_on(lcd);
 616         else if (!ld9040_power_is_on(power) && ld9040_power_is_on(lcd->power))
 617                 ret = ld9040_power_off(lcd);
 618
 619         if (!ret)
 620                 lcd->power = power;
 621
 622         return ret;
 623 }
 624
 625 static int ld9040_set_power(struct lcd_device *ld, int power)
 626 {
 627         struct ld9040 *lcd = lcd_get_data(ld);
 628
 629         if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
 630                 power != FB_BLANK_NORMAL) {
 631                 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
 632                 return -EINVAL;
 633         }
 634
 635         return ld9040_power(lcd, power);
 636 }
 637
 638 static int ld9040_get_power(struct lcd_device *ld)
 639 {
 640         struct ld9040 *lcd = lcd_get_data(ld);
 641
 642         return lcd->power;
 643 }
 644
 645 static int ld9040_set_brightness(struct backlight_device *bd)
 646 {
 647         int ret = 0, brightness = bd->props.brightness;
 648         struct ld9040 *lcd = bl_get_data(bd);
 649
 650         if (brightness < MIN_BRIGHTNESS ||
 651                 brightness > bd->props.max_brightness) {
 652                 dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
 653                         MIN_BRIGHTNESS, MAX_BRIGHTNESS);
 654                 return -EINVAL;
 655         }
 656
 657         ret = ld9040_gamma_ctl(lcd, bd->props.brightness);
 658         if (ret) {
 659                 dev_err(&bd->dev, "lcd brightness setting failed.\n");
 660                 return -EIO;
 661         }
 662
 663         return ret;
 664 }
 665
 666 static struct lcd_ops ld9040_lcd_ops = {
 667         .set_power = ld9040_set_power,
 668         .get_power = ld9040_get_power,
 669 };
 670
 671 static const struct backlight_ops ld9040_backlight_ops  = {
 672         .update_status = ld9040_set_brightness,
 673 };
 674
 675 static int ld9040_probe(struct spi_device *spi)
 676 {
 677         int ret = 0;
 678         struct ld9040 *lcd = NULL;
 679         struct lcd_device *ld = NULL;
 680         struct backlight_device *bd = NULL;
 681         struct backlight_properties props;
 682
 683         lcd = devm_kzalloc(&spi->dev, sizeof(struct ld9040), GFP_KERNEL);
 684         if (!lcd)
 685                 return -ENOMEM;
 686
 687         /* ld9040 lcd panel uses 3-wire 9bits SPI Mode. */
 688         spi->bits_per_word = 9;
 689
 690         ret = spi_setup(spi);
 691         if (ret < 0) {
 692                 dev_err(&spi->dev, "spi setup failed.\n");
 693                 return ret;
 694         }
 695
 696         lcd->spi = spi;
 697         lcd->dev = &spi->dev;
 698
 699         lcd->lcd_pd = dev_get_platdata(&spi->dev);
 700         if (!lcd->lcd_pd) {
 701                 dev_err(&spi->dev, "platform data is NULL.\n");
 702                 return -EINVAL;
 703         }
 704
 705         mutex_init(&lcd->lock);
 706
 707         ret = devm_regulator_bulk_get(lcd->dev, ARRAY_SIZE(supplies), supplies);
 708         if (ret) {
 709                 dev_err(lcd->dev, "Failed to get regulators: %d\n", ret);
 710                 return ret;
 711         }
 712
 713         ld = devm_lcd_device_register(&spi->dev, "ld9040", &spi->dev, lcd,
 714                                         &ld9040_lcd_ops);
 715         if (IS_ERR(ld))
 716                 return PTR_ERR(ld);
 717
 718         lcd->ld = ld;
 719
 720         memset(&props, 0, sizeof(struct backlight_properties));
 721         props.type = BACKLIGHT_RAW;
 722         props.max_brightness = MAX_BRIGHTNESS;
 723
 724         bd = devm_backlight_device_register(&spi->dev, "ld9040-bl", &spi->dev,
 725                                         lcd, &ld9040_backlight_ops, &props);
 726         if (IS_ERR(bd))
 727                 return PTR_ERR(bd);
 728
 729         bd->props.brightness = MAX_BRIGHTNESS;
 730         lcd->bd = bd;
 731
 732         /*
 733          * if lcd panel was on from bootloader like u-boot then
 734          * do not lcd on.
 735          */
 736         if (!lcd->lcd_pd->lcd_enabled) {
 737                 /*
 738                  * if lcd panel was off from bootloader then
 739                  * current lcd status is powerdown and then
 740                  * it enables lcd panel.
 741                  */
 742                 lcd->power = FB_BLANK_POWERDOWN;
 743
 744                 ld9040_power(lcd, FB_BLANK_UNBLANK);
 745         } else {
 746                 lcd->power = FB_BLANK_UNBLANK;
 747         }
 748
 749         spi_set_drvdata(spi, lcd);
 750
 751         dev_info(&spi->dev, "ld9040 panel driver has been probed.\n");
 752         return 0;
 753 }
 754
 755 static int ld9040_remove(struct spi_device *spi)
 756 {
 757         struct ld9040 *lcd = spi_get_drvdata(spi);
 758
 759         ld9040_power(lcd, FB_BLANK_POWERDOWN);
 760         return 0;
 761 }
 762
 763 #ifdef CONFIG_PM_SLEEP
 764 static int ld9040_suspend(struct device *dev)
 765 {
 766         struct ld9040 *lcd = dev_get_drvdata(dev);
 767
 768         dev_dbg(dev, "lcd->power = %d\n", lcd->power);
 769
 770         /*
 771          * when lcd panel is suspend, lcd panel becomes off
 772          * regardless of status.
 773          */
 774         return ld9040_power(lcd, FB_BLANK_POWERDOWN);
 775 }
 776
 777 static int ld9040_resume(struct device *dev)
 778 {
 779         struct ld9040 *lcd = dev_get_drvdata(dev);
 780
 781         lcd->power = FB_BLANK_POWERDOWN;
 782
 783         return ld9040_power(lcd, FB_BLANK_UNBLANK);
 784 }
 785 #endif
 786
 787 static SIMPLE_DEV_PM_OPS(ld9040_pm_ops, ld9040_suspend, ld9040_resume);
 788
 789 /* Power down all displays on reboot, poweroff or halt. */
 790 static void ld9040_shutdown(struct spi_device *spi)
 791 {
 792         struct ld9040 *lcd = spi_get_drvdata(spi);
 793
 794         ld9040_power(lcd, FB_BLANK_POWERDOWN);
 795 }
 796
 797 static struct spi_driver ld9040_driver = {
 798         .driver = {
 799                 .name   = "ld9040",
 800                 .pm     = &ld9040_pm_ops,
 801         },
 802         .probe          = ld9040_probe,
 803         .remove         = ld9040_remove,
 804         .shutdown       = ld9040_shutdown,
 805 };
 806
 807 module_spi_driver(ld9040_driver);
 808
 809 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
 810 MODULE_DESCRIPTION("ld9040 LCD Driver");
 811 MODULE_LICENSE("GPL");