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  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  */
  22
  23 #include <linux/wait.h>
  24 #include <linux/fb.h>
  25 #include <linux/delay.h>
  26 #include <linux/gpio.h>
  27 #include <linux/spi/spi.h>
  28 #include <linux/irq.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/kernel.h>
  31 #include <linux/lcd.h>
  32 #include <linux/backlight.h>
  33 #include <linux/module.h>
  34
  35 #include "ld9040_gamma.h"
  36
  37 #define SLEEPMSEC               0x1000
  38 #define ENDDEF                  0x2000
  39 #define DEFMASK                 0xFF00
  40 #define COMMAND_ONLY            0xFE
  41 #define DATA_ONLY               0xFF
  42
  43 #define MIN_BRIGHTNESS          0
  44 #define MAX_BRIGHTNESS          24
  45 #define power_is_on(pwr)        ((pwr) <= FB_BLANK_NORMAL)
  46
  47 struct ld9040 {
  48         struct device                   *dev;
  49         struct spi_device               *spi;
  50         unsigned int                    power;
  51         unsigned int                    current_brightness;
  52
  53         struct lcd_device               *ld;
  54         struct backlight_device         *bd;
  55         struct lcd_platform_data        *lcd_pd;
  56 };
  57
  58 static const unsigned short seq_swreset[] = {
  59         0x01, COMMAND_ONLY,
  60         ENDDEF, 0x00
  61 };
  62
  63 static const unsigned short seq_user_setting[] = {
  64         0xF0, 0x5A,
  65
  66         DATA_ONLY, 0x5A,
  67         ENDDEF, 0x00
  68 };
  69
  70 static const unsigned short seq_elvss_on[] = {
  71         0xB1, 0x0D,
  72
  73         DATA_ONLY, 0x00,
  74         DATA_ONLY, 0x16,
  75         ENDDEF, 0x00
  76 };
  77
  78 static const unsigned short seq_gtcon[] = {
  79         0xF7, 0x09,
  80
  81         DATA_ONLY, 0x00,
  82         DATA_ONLY, 0x00,
  83         ENDDEF, 0x00
  84 };
  85
  86 static const unsigned short seq_panel_condition[] = {
  87         0xF8, 0x05,
  88
  89         DATA_ONLY, 0x65,
  90         DATA_ONLY, 0x96,
  91         DATA_ONLY, 0x71,
  92         DATA_ONLY, 0x7D,
  93         DATA_ONLY, 0x19,
  94         DATA_ONLY, 0x3B,
  95         DATA_ONLY, 0x0D,
  96         DATA_ONLY, 0x19,
  97         DATA_ONLY, 0x7E,
  98         DATA_ONLY, 0x0D,
  99         DATA_ONLY, 0xE2,
 100         DATA_ONLY, 0x00,
 101         DATA_ONLY, 0x00,
 102         DATA_ONLY, 0x7E,
 103         DATA_ONLY, 0x7D,
 104         DATA_ONLY, 0x07,
 105         DATA_ONLY, 0x07,
 106         DATA_ONLY, 0x20,
 107         DATA_ONLY, 0x20,
 108         DATA_ONLY, 0x20,
 109         DATA_ONLY, 0x02,
 110         DATA_ONLY, 0x02,
 111         ENDDEF, 0x00
 112 };
 113
 114 static const unsigned short seq_gamma_set1[] = {
 115         0xF9, 0x00,
 116
 117         DATA_ONLY, 0xA7,
 118         DATA_ONLY, 0xB4,
 119         DATA_ONLY, 0xAE,
 120         DATA_ONLY, 0xBF,
 121         DATA_ONLY, 0x00,
 122         DATA_ONLY, 0x91,
 123         DATA_ONLY, 0x00,
 124         DATA_ONLY, 0xB2,
 125         DATA_ONLY, 0xB4,
 126         DATA_ONLY, 0xAA,
 127         DATA_ONLY, 0xBB,
 128         DATA_ONLY, 0x00,
 129         DATA_ONLY, 0xAC,
 130         DATA_ONLY, 0x00,
 131         DATA_ONLY, 0xB3,
 132         DATA_ONLY, 0xB1,
 133         DATA_ONLY, 0xAA,
 134         DATA_ONLY, 0xBC,
 135         DATA_ONLY, 0x00,
 136         DATA_ONLY, 0xB3,
 137         ENDDEF, 0x00
 138 };
 139
 140 static const unsigned short seq_gamma_ctrl[] = {
 141         0xFB, 0x02,
 142
 143         DATA_ONLY, 0x5A,
 144         ENDDEF, 0x00
 145 };
 146
 147 static const unsigned short seq_gamma_start[] = {
 148         0xF9, COMMAND_ONLY,
 149
 150         ENDDEF, 0x00
 151 };
 152
 153 static const unsigned short seq_apon[] = {
 154         0xF3, 0x00,
 155
 156         DATA_ONLY, 0x00,
 157         DATA_ONLY, 0x00,
 158         DATA_ONLY, 0x0A,
 159         DATA_ONLY, 0x02,
 160         ENDDEF, 0x00
 161 };
 162
 163 static const unsigned short seq_display_ctrl[] = {
 164         0xF2, 0x02,
 165
 166         DATA_ONLY, 0x08,
 167         DATA_ONLY, 0x08,
 168         DATA_ONLY, 0x10,
 169         DATA_ONLY, 0x10,
 170         ENDDEF, 0x00
 171 };
 172
 173 static const unsigned short seq_manual_pwr[] = {
 174         0xB0, 0x04,
 175         ENDDEF, 0x00
 176 };
 177
 178 static const unsigned short seq_pwr_ctrl[] = {
 179         0xF4, 0x0A,
 180
 181         DATA_ONLY, 0x87,
 182         DATA_ONLY, 0x25,
 183         DATA_ONLY, 0x6A,
 184         DATA_ONLY, 0x44,
 185         DATA_ONLY, 0x02,
 186         DATA_ONLY, 0x88,
 187         ENDDEF, 0x00
 188 };
 189
 190 static const unsigned short seq_sleep_out[] = {
 191         0x11, COMMAND_ONLY,
 192         ENDDEF, 0x00
 193 };
 194
 195 static const unsigned short seq_sleep_in[] = {
 196         0x10, COMMAND_ONLY,
 197         ENDDEF, 0x00
 198 };
 199
 200 static const unsigned short seq_display_on[] = {
 201         0x29, COMMAND_ONLY,
 202         ENDDEF, 0x00
 203 };
 204
 205 static const unsigned short seq_display_off[] = {
 206         0x28, COMMAND_ONLY,
 207         ENDDEF, 0x00
 208 };
 209
 210 static const unsigned short seq_vci1_1st_en[] = {
 211         0xF3, 0x10,
 212
 213         DATA_ONLY, 0x00,
 214         DATA_ONLY, 0x00,
 215         DATA_ONLY, 0x00,
 216         DATA_ONLY, 0x02,
 217         ENDDEF, 0x00
 218 };
 219
 220 static const unsigned short seq_vl1_en[] = {
 221         0xF3, 0x11,
 222
 223         DATA_ONLY, 0x00,
 224         DATA_ONLY, 0x00,
 225         DATA_ONLY, 0x00,
 226         DATA_ONLY, 0x02,
 227         ENDDEF, 0x00
 228 };
 229
 230 static const unsigned short seq_vl2_en[] = {
 231         0xF3, 0x13,
 232
 233         DATA_ONLY, 0x00,
 234         DATA_ONLY, 0x00,
 235         DATA_ONLY, 0x00,
 236         DATA_ONLY, 0x02,
 237         ENDDEF, 0x00
 238 };
 239
 240 static const unsigned short seq_vci1_2nd_en[] = {
 241         0xF3, 0x33,
 242
 243         DATA_ONLY, 0x00,
 244         DATA_ONLY, 0x00,
 245         DATA_ONLY, 0x00,
 246         DATA_ONLY, 0x02,
 247         ENDDEF, 0x00
 248 };
 249
 250 static const unsigned short seq_vl3_en[] = {
 251         0xF3, 0x37,
 252
 253         DATA_ONLY, 0x00,
 254         DATA_ONLY, 0x00,
 255         DATA_ONLY, 0x00,
 256         DATA_ONLY, 0x02,
 257         ENDDEF, 0x00
 258 };
 259
 260 static const unsigned short seq_vreg1_amp_en[] = {
 261         0xF3, 0x37,
 262
 263         DATA_ONLY, 0x01,
 264         DATA_ONLY, 0x00,
 265         DATA_ONLY, 0x00,
 266         DATA_ONLY, 0x02,
 267         ENDDEF, 0x00
 268 };
 269
 270 static const unsigned short seq_vgh_amp_en[] = {
 271         0xF3, 0x37,
 272
 273         DATA_ONLY, 0x11,
 274         DATA_ONLY, 0x00,
 275         DATA_ONLY, 0x00,
 276         DATA_ONLY, 0x02,
 277         ENDDEF, 0x00
 278 };
 279
 280 static const unsigned short seq_vgl_amp_en[] = {
 281         0xF3, 0x37,
 282
 283         DATA_ONLY, 0x31,
 284         DATA_ONLY, 0x00,
 285         DATA_ONLY, 0x00,
 286         DATA_ONLY, 0x02,
 287         ENDDEF, 0x00
 288 };
 289
 290 static const unsigned short seq_vmos_amp_en[] = {
 291         0xF3, 0x37,
 292
 293         DATA_ONLY, 0xB1,
 294         DATA_ONLY, 0x00,
 295         DATA_ONLY, 0x00,
 296         DATA_ONLY, 0x03,
 297         ENDDEF, 0x00
 298 };
 299
 300 static const unsigned short seq_vint_amp_en[] = {
 301         0xF3, 0x37,
 302
 303         DATA_ONLY, 0xF1,
 304         /* DATA_ONLY, 0x71,     VMOS/VBL/VBH not used */
 305         DATA_ONLY, 0x00,
 306         DATA_ONLY, 0x00,
 307         DATA_ONLY, 0x03,
 308         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 309         ENDDEF, 0x00
 310 };
 311
 312 static const unsigned short seq_vbh_amp_en[] = {
 313         0xF3, 0x37,
 314
 315         DATA_ONLY, 0xF9,
 316         DATA_ONLY, 0x00,
 317         DATA_ONLY, 0x00,
 318         DATA_ONLY, 0x03,
 319         ENDDEF, 0x00
 320 };
 321
 322 static const unsigned short seq_vbl_amp_en[] = {
 323         0xF3, 0x37,
 324
 325         DATA_ONLY, 0xFD,
 326         DATA_ONLY, 0x00,
 327         DATA_ONLY, 0x00,
 328         DATA_ONLY, 0x03,
 329         ENDDEF, 0x00
 330 };
 331
 332 static const unsigned short seq_gam_amp_en[] = {
 333         0xF3, 0x37,
 334
 335         DATA_ONLY, 0xFF,
 336         /* DATA_ONLY, 0x73,     VMOS/VBL/VBH not used */
 337         DATA_ONLY, 0x00,
 338         DATA_ONLY, 0x00,
 339         DATA_ONLY, 0x03,
 340         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 341         ENDDEF, 0x00
 342 };
 343
 344 static const unsigned short seq_sd_amp_en[] = {
 345         0xF3, 0x37,
 346
 347         DATA_ONLY, 0xFF,
 348         /* DATA_ONLY, 0x73,     VMOS/VBL/VBH not used */
 349         DATA_ONLY, 0x80,
 350         DATA_ONLY, 0x00,
 351         DATA_ONLY, 0x03,
 352         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 353         ENDDEF, 0x00
 354 };
 355
 356 static const unsigned short seq_gls_en[] = {
 357         0xF3, 0x37,
 358
 359         DATA_ONLY, 0xFF,
 360         /* DATA_ONLY, 0x73,     VMOS/VBL/VBH not used */
 361         DATA_ONLY, 0x81,
 362         DATA_ONLY, 0x00,
 363         DATA_ONLY, 0x03,
 364         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 365         ENDDEF, 0x00
 366 };
 367
 368 static const unsigned short seq_els_en[] = {
 369         0xF3, 0x37,
 370
 371         DATA_ONLY, 0xFF,
 372         /* DATA_ONLY, 0x73,     VMOS/VBL/VBH not used */
 373         DATA_ONLY, 0x83,
 374         DATA_ONLY, 0x00,
 375         DATA_ONLY, 0x03,
 376         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 377         ENDDEF, 0x00
 378 };
 379
 380 static const unsigned short seq_el_on[] = {
 381         0xF3, 0x37,
 382
 383         DATA_ONLY, 0xFF,
 384         /* DATA_ONLY, 0x73,     VMOS/VBL/VBH not used */
 385         DATA_ONLY, 0x87,
 386         DATA_ONLY, 0x00,
 387         DATA_ONLY, 0x03,
 388         /* DATA_ONLY, 0x02,     VMOS/VBL/VBH not used */
 389         ENDDEF, 0x00
 390 };
 391
 392 static int ld9040_spi_write_byte(struct ld9040 *lcd, int addr, int data)
 393 {
 394         u16 buf[1];
 395         struct spi_message msg;
 396
 397         struct spi_transfer xfer = {
 398                 .len            = 2,
 399                 .tx_buf         = buf,
 400         };
 401
 402         buf[0] = (addr << 8) | data;
 403
 404         spi_message_init(&msg);
 405         spi_message_add_tail(&xfer, &msg);
 406
 407         return spi_sync(lcd->spi, &msg);
 408 }
 409
 410 static int ld9040_spi_write(struct ld9040 *lcd, unsigned char address,
 411         unsigned char command)
 412 {
 413         int ret = 0;
 414
 415         if (address != DATA_ONLY)
 416                 ret = ld9040_spi_write_byte(lcd, 0x0, address);
 417         if (command != COMMAND_ONLY)
 418                 ret = ld9040_spi_write_byte(lcd, 0x1, command);
 419
 420         return ret;
 421 }
 422
 423 static int ld9040_panel_send_sequence(struct ld9040 *lcd,
 424         const unsigned short *wbuf)
 425 {
 426         int ret = 0, i = 0;
 427
 428         while ((wbuf[i] & DEFMASK) != ENDDEF) {
 429                 if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
 430                         ret = ld9040_spi_write(lcd, wbuf[i], wbuf[i+1]);
 431                         if (ret)
 432                                 break;
 433                 } else
 434                         udelay(wbuf[i+1]*1000);
 435                 i += 2;
 436         }
 437
 438         return ret;
 439 }
 440
 441 static int _ld9040_gamma_ctl(struct ld9040 *lcd, const unsigned int *gamma)
 442 {
 443         unsigned int i = 0;
 444         int ret = 0;
 445
 446         /* start gamma table updating. */
 447         ret = ld9040_panel_send_sequence(lcd, seq_gamma_start);
 448         if (ret) {
 449                 dev_err(lcd->dev, "failed to disable gamma table updating.\n");
 450                 goto gamma_err;
 451         }
 452
 453         for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
 454                 ret = ld9040_spi_write(lcd, DATA_ONLY, gamma[i]);
 455                 if (ret) {
 456                         dev_err(lcd->dev, "failed to set gamma table.\n");
 457                         goto gamma_err;
 458                 }
 459         }
 460
 461         /* update gamma table. */
 462         ret = ld9040_panel_send_sequence(lcd, seq_gamma_ctrl);
 463         if (ret)
 464                 dev_err(lcd->dev, "failed to update gamma table.\n");
 465
 466 gamma_err:
 467         return ret;
 468 }
 469
 470 static int ld9040_gamma_ctl(struct ld9040 *lcd, int gamma)
 471 {
 472         int ret = 0;
 473
 474         ret = _ld9040_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
 475
 476         return ret;
 477 }
 478
 479
 480 static int ld9040_ldi_init(struct ld9040 *lcd)
 481 {
 482         int ret, i;
 483         static const unsigned short *init_seq[] = {
 484                 seq_user_setting,
 485                 seq_panel_condition,
 486                 seq_display_ctrl,
 487                 seq_manual_pwr,
 488                 seq_elvss_on,
 489                 seq_gtcon,
 490                 seq_gamma_set1,
 491                 seq_gamma_ctrl,
 492                 seq_sleep_out,
 493         };
 494
 495         for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
 496                 ret = ld9040_panel_send_sequence(lcd, init_seq[i]);
 497                 /* workaround: minimum delay time for transferring CMD */
 498                 udelay(300);
 499                 if (ret)
 500                         break;
 501         }
 502
 503         return ret;
 504 }
 505
 506 static int ld9040_ldi_enable(struct ld9040 *lcd)
 507 {
 508         int ret = 0;
 509
 510         ret = ld9040_panel_send_sequence(lcd, seq_display_on);
 511
 512         return ret;
 513 }
 514
 515 static int ld9040_ldi_disable(struct ld9040 *lcd)
 516 {
 517         int ret;
 518
 519         ret = ld9040_panel_send_sequence(lcd, seq_display_off);
 520         ret = ld9040_panel_send_sequence(lcd, seq_sleep_in);
 521
 522         return ret;
 523 }
 524
 525 static int ld9040_power_on(struct ld9040 *lcd)
 526 {
 527         int ret = 0;
 528         struct lcd_platform_data *pd = NULL;
 529         pd = lcd->lcd_pd;
 530         if (!pd) {
 531                 dev_err(lcd->dev, "platform data is NULL.\n");
 532                 return -EFAULT;
 533         }
 534
 535         if (!pd->power_on) {
 536                 dev_err(lcd->dev, "power_on is NULL.\n");
 537                 return -EFAULT;
 538         } else {
 539                 pd->power_on(lcd->ld, 1);
 540                 mdelay(pd->power_on_delay);
 541         }
 542
 543         if (!pd->reset) {
 544                 dev_err(lcd->dev, "reset is NULL.\n");
 545                 return -EFAULT;
 546         } else {
 547                 pd->reset(lcd->ld);
 548                 mdelay(pd->reset_delay);
 549         }
 550
 551         ret = ld9040_ldi_init(lcd);
 552         if (ret) {
 553                 dev_err(lcd->dev, "failed to initialize ldi.\n");
 554                 return ret;
 555         }
 556
 557         ret = ld9040_ldi_enable(lcd);
 558         if (ret) {
 559                 dev_err(lcd->dev, "failed to enable ldi.\n");
 560                 return ret;
 561         }
 562
 563         return 0;
 564 }
 565
 566 static int ld9040_power_off(struct ld9040 *lcd)
 567 {
 568         int ret = 0;
 569         struct lcd_platform_data *pd = NULL;
 570
 571         pd = lcd->lcd_pd;
 572         if (!pd) {
 573                 dev_err(lcd->dev, "platform data is NULL.\n");
 574                 return -EFAULT;
 575         }
 576
 577         ret = ld9040_ldi_disable(lcd);
 578         if (ret) {
 579                 dev_err(lcd->dev, "lcd setting failed.\n");
 580                 return -EIO;
 581         }
 582
 583         mdelay(pd->power_off_delay);
 584
 585         if (!pd->power_on) {
 586                 dev_err(lcd->dev, "power_on is NULL.\n");
 587                 return -EFAULT;
 588         } else
 589                 pd->power_on(lcd->ld, 0);
 590
 591         return 0;
 592 }
 593
 594 static int ld9040_power(struct ld9040 *lcd, int power)
 595 {
 596         int ret = 0;
 597
 598         if (power_is_on(power) && !power_is_on(lcd->power))
 599                 ret = ld9040_power_on(lcd);
 600         else if (!power_is_on(power) && power_is_on(lcd->power))
 601                 ret = ld9040_power_off(lcd);
 602
 603         if (!ret)
 604                 lcd->power = power;
 605
 606         return ret;
 607 }
 608
 609 static int ld9040_set_power(struct lcd_device *ld, int power)
 610 {
 611         struct ld9040 *lcd = lcd_get_data(ld);
 612
 613         if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
 614                 power != FB_BLANK_NORMAL) {
 615                 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
 616                 return -EINVAL;
 617         }
 618
 619         return ld9040_power(lcd, power);
 620 }
 621
 622 static int ld9040_get_power(struct lcd_device *ld)
 623 {
 624         struct ld9040 *lcd = lcd_get_data(ld);
 625
 626         return lcd->power;
 627 }
 628
 629 static int ld9040_get_brightness(struct backlight_device *bd)
 630 {
 631         return bd->props.brightness;
 632 }
 633
 634 static int ld9040_set_brightness(struct backlight_device *bd)
 635 {
 636         int ret = 0, brightness = bd->props.brightness;
 637         struct ld9040 *lcd = bl_get_data(bd);
 638
 639         if (brightness < MIN_BRIGHTNESS ||
 640                 brightness > bd->props.max_brightness) {
 641                 dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
 642                         MIN_BRIGHTNESS, MAX_BRIGHTNESS);
 643                 return -EINVAL;
 644         }
 645
 646         ret = ld9040_gamma_ctl(lcd, bd->props.brightness);
 647         if (ret) {
 648                 dev_err(&bd->dev, "lcd brightness setting failed.\n");
 649                 return -EIO;
 650         }
 651
 652         return ret;
 653 }
 654
 655 static struct lcd_ops ld9040_lcd_ops = {
 656         .set_power = ld9040_set_power,
 657         .get_power = ld9040_get_power,
 658 };
 659
 660 static const struct backlight_ops ld9040_backlight_ops  = {
 661         .get_brightness = ld9040_get_brightness,
 662         .update_status = ld9040_set_brightness,
 663 };
 664
 665
 666 static int ld9040_probe(struct spi_device *spi)
 667 {
 668         int ret = 0;
 669         struct ld9040 *lcd = NULL;
 670         struct lcd_device *ld = NULL;
 671         struct backlight_device *bd = NULL;
 672         struct backlight_properties props;
 673
 674         lcd = kzalloc(sizeof(struct ld9040), GFP_KERNEL);
 675         if (!lcd)
 676                 return -ENOMEM;
 677
 678         /* ld9040 lcd panel uses 3-wire 9bits SPI Mode. */
 679         spi->bits_per_word = 9;
 680
 681         ret = spi_setup(spi);
 682         if (ret < 0) {
 683                 dev_err(&spi->dev, "spi setup failed.\n");
 684                 goto out_free_lcd;
 685         }
 686
 687         lcd->spi = spi;
 688         lcd->dev = &spi->dev;
 689
 690         lcd->lcd_pd = spi->dev.platform_data;
 691         if (!lcd->lcd_pd) {
 692                 dev_err(&spi->dev, "platform data is NULL.\n");
 693                 goto out_free_lcd;
 694         }
 695
 696         ld = lcd_device_register("ld9040", &spi->dev, lcd, &ld9040_lcd_ops);
 697         if (IS_ERR(ld)) {
 698                 ret = PTR_ERR(ld);
 699                 goto out_free_lcd;
 700         }
 701
 702         lcd->ld = ld;
 703
 704         memset(&props, 0, sizeof(struct backlight_properties));
 705         props.type = BACKLIGHT_RAW;
 706         props.max_brightness = MAX_BRIGHTNESS;
 707
 708         bd = backlight_device_register("ld9040-bl", &spi->dev,
 709                 lcd, &ld9040_backlight_ops, &props);
 710         if (IS_ERR(bd)) {
 711                 ret = PTR_ERR(bd);
 712                 goto out_unregister_lcd;
 713         }
 714
 715         bd->props.brightness = MAX_BRIGHTNESS;
 716         lcd->bd = bd;
 717
 718         /*
 719          * if lcd panel was on from bootloader like u-boot then
 720          * do not lcd on.
 721          */
 722         if (!lcd->lcd_pd->lcd_enabled) {
 723                 /*
 724                  * if lcd panel was off from bootloader then
 725                  * current lcd status is powerdown and then
 726                  * it enables lcd panel.
 727                  */
 728                 lcd->power = FB_BLANK_POWERDOWN;
 729
 730                 ld9040_power(lcd, FB_BLANK_UNBLANK);
 731         } else
 732                 lcd->power = FB_BLANK_UNBLANK;
 733
 734         dev_set_drvdata(&spi->dev, lcd);
 735
 736         dev_info(&spi->dev, "ld9040 panel driver has been probed.\n");
 737         return 0;
 738
 739 out_unregister_lcd:
 740         lcd_device_unregister(lcd->ld);
 741 out_free_lcd:
 742         kfree(lcd);
 743         return ret;
 744 }
 745
 746 static int __devexit ld9040_remove(struct spi_device *spi)
 747 {
 748         struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
 749
 750         ld9040_power(lcd, FB_BLANK_POWERDOWN);
 751         backlight_device_unregister(lcd->bd);
 752         lcd_device_unregister(lcd->ld);
 753         kfree(lcd);
 754
 755         return 0;
 756 }
 757
 758 #if defined(CONFIG_PM)
 759 static int ld9040_suspend(struct spi_device *spi, pm_message_t mesg)
 760 {
 761         int ret = 0;
 762         struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
 763
 764         dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
 765
 766         /*
 767          * when lcd panel is suspend, lcd panel becomes off
 768          * regardless of status.
 769          */
 770         ret = ld9040_power(lcd, FB_BLANK_POWERDOWN);
 771
 772         return ret;
 773 }
 774
 775 static int ld9040_resume(struct spi_device *spi)
 776 {
 777         int ret = 0;
 778         struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
 779
 780         lcd->power = FB_BLANK_POWERDOWN;
 781
 782         ret = ld9040_power(lcd, FB_BLANK_UNBLANK);
 783
 784         return ret;
 785 }
 786 #else
 787 #define ld9040_suspend          NULL
 788 #define ld9040_resume           NULL
 789 #endif
 790
 791 /* Power down all displays on reboot, poweroff or halt. */
 792 static void ld9040_shutdown(struct spi_device *spi)
 793 {
 794         struct ld9040 *lcd = dev_get_drvdata(&spi->dev);
 795
 796         ld9040_power(lcd, FB_BLANK_POWERDOWN);
 797 }
 798
 799 static struct spi_driver ld9040_driver = {
 800         .driver = {
 801                 .name   = "ld9040",
 802                 .bus    = &spi_bus_type,
 803                 .owner  = THIS_MODULE,
 804         },
 805         .probe          = ld9040_probe,
 806         .remove         = __devexit_p(ld9040_remove),
 807         .shutdown       = ld9040_shutdown,
 808         .suspend        = ld9040_suspend,
 809         .resume         = ld9040_resume,
 810 };
 811
 812 static int __init ld9040_init(void)
 813 {
 814         return spi_register_driver(&ld9040_driver);
 815 }
 816
 817 static void __exit ld9040_exit(void)
 818 {
 819         spi_unregister_driver(&ld9040_driver);
 820 }
 821
 822 module_init(ld9040_init);
 823 module_exit(ld9040_exit);
 824
 825 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
 826 MODULE_DESCRIPTION("ld9040 LCD Driver");
 827 MODULE_LICENSE("GPL");