release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/video/backlight/s6e63m0.c

   1 /*
   2  * S6E63M0 AMOLED LCD panel driver.
   3  *
   4  * Author: InKi Dae  <inki.dae@samsung.com>
   5  *
   6  * Derived from drivers/video/omap/lcd-apollon.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
  34 #include "s6e63m0_gamma.h"
  35
  36 #define SLEEPMSEC               0x1000
  37 #define ENDDEF                  0x2000
  38 #define DEFMASK                 0xFF00
  39 #define COMMAND_ONLY            0xFE
  40 #define DATA_ONLY               0xFF
  41
  42 #define MIN_BRIGHTNESS          0
  43 #define MAX_BRIGHTNESS          10
  44
  45 #define POWER_IS_ON(pwr)        ((pwr) <= FB_BLANK_NORMAL)
  46
  47 struct s6e63m0 {
  48         struct device                   *dev;
  49         struct spi_device               *spi;
  50         unsigned int                    power;
  51         unsigned int                    current_brightness;
  52         unsigned int                    gamma_mode;
  53         unsigned int                    gamma_table_count;
  54         struct lcd_device               *ld;
  55         struct backlight_device         *bd;
  56         struct lcd_platform_data        *lcd_pd;
  57 };
  58
  59 static const unsigned short SEQ_PANEL_CONDITION_SET[] = {
  60         0xF8, 0x01,
  61         DATA_ONLY, 0x27,
  62         DATA_ONLY, 0x27,
  63         DATA_ONLY, 0x07,
  64         DATA_ONLY, 0x07,
  65         DATA_ONLY, 0x54,
  66         DATA_ONLY, 0x9f,
  67         DATA_ONLY, 0x63,
  68         DATA_ONLY, 0x86,
  69         DATA_ONLY, 0x1a,
  70         DATA_ONLY, 0x33,
  71         DATA_ONLY, 0x0d,
  72         DATA_ONLY, 0x00,
  73         DATA_ONLY, 0x00,
  74
  75         ENDDEF, 0x0000
  76 };
  77
  78 static const unsigned short SEQ_DISPLAY_CONDITION_SET[] = {
  79         0xf2, 0x02,
  80         DATA_ONLY, 0x03,
  81         DATA_ONLY, 0x1c,
  82         DATA_ONLY, 0x10,
  83         DATA_ONLY, 0x10,
  84
  85         0xf7, 0x03,
  86         DATA_ONLY, 0x00,
  87         DATA_ONLY, 0x00,
  88
  89         ENDDEF, 0x0000
  90 };
  91
  92 static const unsigned short SEQ_GAMMA_SETTING[] = {
  93         0xfa, 0x00,
  94         DATA_ONLY, 0x18,
  95         DATA_ONLY, 0x08,
  96         DATA_ONLY, 0x24,
  97         DATA_ONLY, 0x64,
  98         DATA_ONLY, 0x56,
  99         DATA_ONLY, 0x33,
 100         DATA_ONLY, 0xb6,
 101         DATA_ONLY, 0xba,
 102         DATA_ONLY, 0xa8,
 103         DATA_ONLY, 0xac,
 104         DATA_ONLY, 0xb1,
 105         DATA_ONLY, 0x9d,
 106         DATA_ONLY, 0xc1,
 107         DATA_ONLY, 0xc1,
 108         DATA_ONLY, 0xb7,
 109         DATA_ONLY, 0x00,
 110         DATA_ONLY, 0x9c,
 111         DATA_ONLY, 0x00,
 112         DATA_ONLY, 0x9f,
 113         DATA_ONLY, 0x00,
 114         DATA_ONLY, 0xd6,
 115
 116         0xfa, 0x01,
 117
 118         ENDDEF, 0x0000
 119 };
 120
 121 static const unsigned short SEQ_ETC_CONDITION_SET[] = {
 122         0xf6, 0x00,
 123         DATA_ONLY, 0x8c,
 124         DATA_ONLY, 0x07,
 125
 126         0xb3, 0xc,
 127
 128         0xb5, 0x2c,
 129         DATA_ONLY, 0x12,
 130         DATA_ONLY, 0x0c,
 131         DATA_ONLY, 0x0a,
 132         DATA_ONLY, 0x10,
 133         DATA_ONLY, 0x0e,
 134         DATA_ONLY, 0x17,
 135         DATA_ONLY, 0x13,
 136         DATA_ONLY, 0x1f,
 137         DATA_ONLY, 0x1a,
 138         DATA_ONLY, 0x2a,
 139         DATA_ONLY, 0x24,
 140         DATA_ONLY, 0x1f,
 141         DATA_ONLY, 0x1b,
 142         DATA_ONLY, 0x1a,
 143         DATA_ONLY, 0x17,
 144
 145         DATA_ONLY, 0x2b,
 146         DATA_ONLY, 0x26,
 147         DATA_ONLY, 0x22,
 148         DATA_ONLY, 0x20,
 149         DATA_ONLY, 0x3a,
 150         DATA_ONLY, 0x34,
 151         DATA_ONLY, 0x30,
 152         DATA_ONLY, 0x2c,
 153         DATA_ONLY, 0x29,
 154         DATA_ONLY, 0x26,
 155         DATA_ONLY, 0x25,
 156         DATA_ONLY, 0x23,
 157         DATA_ONLY, 0x21,
 158         DATA_ONLY, 0x20,
 159         DATA_ONLY, 0x1e,
 160         DATA_ONLY, 0x1e,
 161
 162         0xb6, 0x00,
 163         DATA_ONLY, 0x00,
 164         DATA_ONLY, 0x11,
 165         DATA_ONLY, 0x22,
 166         DATA_ONLY, 0x33,
 167         DATA_ONLY, 0x44,
 168         DATA_ONLY, 0x44,
 169         DATA_ONLY, 0x44,
 170
 171         DATA_ONLY, 0x55,
 172         DATA_ONLY, 0x55,
 173         DATA_ONLY, 0x66,
 174         DATA_ONLY, 0x66,
 175         DATA_ONLY, 0x66,
 176         DATA_ONLY, 0x66,
 177         DATA_ONLY, 0x66,
 178         DATA_ONLY, 0x66,
 179
 180         0xb7, 0x2c,
 181         DATA_ONLY, 0x12,
 182         DATA_ONLY, 0x0c,
 183         DATA_ONLY, 0x0a,
 184         DATA_ONLY, 0x10,
 185         DATA_ONLY, 0x0e,
 186         DATA_ONLY, 0x17,
 187         DATA_ONLY, 0x13,
 188         DATA_ONLY, 0x1f,
 189         DATA_ONLY, 0x1a,
 190         DATA_ONLY, 0x2a,
 191         DATA_ONLY, 0x24,
 192         DATA_ONLY, 0x1f,
 193         DATA_ONLY, 0x1b,
 194         DATA_ONLY, 0x1a,
 195         DATA_ONLY, 0x17,
 196
 197         DATA_ONLY, 0x2b,
 198         DATA_ONLY, 0x26,
 199         DATA_ONLY, 0x22,
 200         DATA_ONLY, 0x20,
 201         DATA_ONLY, 0x3a,
 202         DATA_ONLY, 0x34,
 203         DATA_ONLY, 0x30,
 204         DATA_ONLY, 0x2c,
 205         DATA_ONLY, 0x29,
 206         DATA_ONLY, 0x26,
 207         DATA_ONLY, 0x25,
 208         DATA_ONLY, 0x23,
 209         DATA_ONLY, 0x21,
 210         DATA_ONLY, 0x20,
 211         DATA_ONLY, 0x1e,
 212         DATA_ONLY, 0x1e,
 213
 214         0xb8, 0x00,
 215         DATA_ONLY, 0x00,
 216         DATA_ONLY, 0x11,
 217         DATA_ONLY, 0x22,
 218         DATA_ONLY, 0x33,
 219         DATA_ONLY, 0x44,
 220         DATA_ONLY, 0x44,
 221         DATA_ONLY, 0x44,
 222
 223         DATA_ONLY, 0x55,
 224         DATA_ONLY, 0x55,
 225         DATA_ONLY, 0x66,
 226         DATA_ONLY, 0x66,
 227         DATA_ONLY, 0x66,
 228         DATA_ONLY, 0x66,
 229         DATA_ONLY, 0x66,
 230         DATA_ONLY, 0x66,
 231
 232         0xb9, 0x2c,
 233         DATA_ONLY, 0x12,
 234         DATA_ONLY, 0x0c,
 235         DATA_ONLY, 0x0a,
 236         DATA_ONLY, 0x10,
 237         DATA_ONLY, 0x0e,
 238         DATA_ONLY, 0x17,
 239         DATA_ONLY, 0x13,
 240         DATA_ONLY, 0x1f,
 241         DATA_ONLY, 0x1a,
 242         DATA_ONLY, 0x2a,
 243         DATA_ONLY, 0x24,
 244         DATA_ONLY, 0x1f,
 245         DATA_ONLY, 0x1b,
 246         DATA_ONLY, 0x1a,
 247         DATA_ONLY, 0x17,
 248
 249         DATA_ONLY, 0x2b,
 250         DATA_ONLY, 0x26,
 251         DATA_ONLY, 0x22,
 252         DATA_ONLY, 0x20,
 253         DATA_ONLY, 0x3a,
 254         DATA_ONLY, 0x34,
 255         DATA_ONLY, 0x30,
 256         DATA_ONLY, 0x2c,
 257         DATA_ONLY, 0x29,
 258         DATA_ONLY, 0x26,
 259         DATA_ONLY, 0x25,
 260         DATA_ONLY, 0x23,
 261         DATA_ONLY, 0x21,
 262         DATA_ONLY, 0x20,
 263         DATA_ONLY, 0x1e,
 264         DATA_ONLY, 0x1e,
 265
 266         0xba, 0x00,
 267         DATA_ONLY, 0x00,
 268         DATA_ONLY, 0x11,
 269         DATA_ONLY, 0x22,
 270         DATA_ONLY, 0x33,
 271         DATA_ONLY, 0x44,
 272         DATA_ONLY, 0x44,
 273         DATA_ONLY, 0x44,
 274
 275         DATA_ONLY, 0x55,
 276         DATA_ONLY, 0x55,
 277         DATA_ONLY, 0x66,
 278         DATA_ONLY, 0x66,
 279         DATA_ONLY, 0x66,
 280         DATA_ONLY, 0x66,
 281         DATA_ONLY, 0x66,
 282         DATA_ONLY, 0x66,
 283
 284         0xc1, 0x4d,
 285         DATA_ONLY, 0x96,
 286         DATA_ONLY, 0x1d,
 287         DATA_ONLY, 0x00,
 288         DATA_ONLY, 0x00,
 289         DATA_ONLY, 0x01,
 290         DATA_ONLY, 0xdf,
 291         DATA_ONLY, 0x00,
 292         DATA_ONLY, 0x00,
 293         DATA_ONLY, 0x03,
 294         DATA_ONLY, 0x1f,
 295         DATA_ONLY, 0x00,
 296         DATA_ONLY, 0x00,
 297         DATA_ONLY, 0x00,
 298         DATA_ONLY, 0x00,
 299         DATA_ONLY, 0x00,
 300         DATA_ONLY, 0x00,
 301         DATA_ONLY, 0x00,
 302         DATA_ONLY, 0x00,
 303         DATA_ONLY, 0x03,
 304         DATA_ONLY, 0x06,
 305         DATA_ONLY, 0x09,
 306         DATA_ONLY, 0x0d,
 307         DATA_ONLY, 0x0f,
 308         DATA_ONLY, 0x12,
 309         DATA_ONLY, 0x15,
 310         DATA_ONLY, 0x18,
 311
 312         0xb2, 0x10,
 313         DATA_ONLY, 0x10,
 314         DATA_ONLY, 0x0b,
 315         DATA_ONLY, 0x05,
 316
 317         ENDDEF, 0x0000
 318 };
 319
 320 static const unsigned short SEQ_ACL_ON[] = {
 321         /* ACL on */
 322         0xc0, 0x01,
 323
 324         ENDDEF, 0x0000
 325 };
 326
 327 static const unsigned short SEQ_ACL_OFF[] = {
 328         /* ACL off */
 329         0xc0, 0x00,
 330
 331         ENDDEF, 0x0000
 332 };
 333
 334 static const unsigned short SEQ_ELVSS_ON[] = {
 335         /* ELVSS on */
 336         0xb1, 0x0b,
 337
 338         ENDDEF, 0x0000
 339 };
 340
 341 static const unsigned short SEQ_ELVSS_OFF[] = {
 342         /* ELVSS off */
 343         0xb1, 0x0a,
 344
 345         ENDDEF, 0x0000
 346 };
 347
 348 static const unsigned short SEQ_STAND_BY_OFF[] = {
 349         0x11, COMMAND_ONLY,
 350
 351         ENDDEF, 0x0000
 352 };
 353
 354 static const unsigned short SEQ_STAND_BY_ON[] = {
 355         0x10, COMMAND_ONLY,
 356
 357         ENDDEF, 0x0000
 358 };
 359
 360 static const unsigned short SEQ_DISPLAY_ON[] = {
 361         0x29, COMMAND_ONLY,
 362
 363         ENDDEF, 0x0000
 364 };
 365
 366
 367 static int s6e63m0_spi_write_byte(struct s6e63m0 *lcd, int addr, int data)
 368 {
 369         u16 buf[1];
 370         struct spi_message msg;
 371
 372         struct spi_transfer xfer = {
 373                 .len            = 2,
 374                 .tx_buf         = buf,
 375         };
 376
 377         buf[0] = (addr << 8) | data;
 378
 379         spi_message_init(&msg);
 380         spi_message_add_tail(&xfer, &msg);
 381
 382         return spi_sync(lcd->spi, &msg);
 383 }
 384
 385 static int s6e63m0_spi_write(struct s6e63m0 *lcd, unsigned char address,
 386         unsigned char command)
 387 {
 388         int ret = 0;
 389
 390         if (address != DATA_ONLY)
 391                 ret = s6e63m0_spi_write_byte(lcd, 0x0, address);
 392         if (command != COMMAND_ONLY)
 393                 ret = s6e63m0_spi_write_byte(lcd, 0x1, command);
 394
 395         return ret;
 396 }
 397
 398 static int s6e63m0_panel_send_sequence(struct s6e63m0 *lcd,
 399         const unsigned short *wbuf)
 400 {
 401         int ret = 0, i = 0;
 402
 403         while ((wbuf[i] & DEFMASK) != ENDDEF) {
 404                 if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
 405                         ret = s6e63m0_spi_write(lcd, wbuf[i], wbuf[i+1]);
 406                         if (ret)
 407                                 break;
 408                 } else
 409                         udelay(wbuf[i+1]*1000);
 410                 i += 2;
 411         }
 412
 413         return ret;
 414 }
 415
 416 static int _s6e63m0_gamma_ctl(struct s6e63m0 *lcd, const unsigned int *gamma)
 417 {
 418         unsigned int i = 0;
 419         int ret = 0;
 420
 421         /* disable gamma table updating. */
 422         ret = s6e63m0_spi_write(lcd, 0xfa, 0x00);
 423         if (ret) {
 424                 dev_err(lcd->dev, "failed to disable gamma table updating.\n");
 425                 goto gamma_err;
 426         }
 427
 428         for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
 429                 ret = s6e63m0_spi_write(lcd, DATA_ONLY, gamma[i]);
 430                 if (ret) {
 431                         dev_err(lcd->dev, "failed to set gamma table.\n");
 432                         goto gamma_err;
 433                 }
 434         }
 435
 436         /* update gamma table. */
 437         ret = s6e63m0_spi_write(lcd, 0xfa, 0x01);
 438         if (ret)
 439                 dev_err(lcd->dev, "failed to update gamma table.\n");
 440
 441 gamma_err:
 442         return ret;
 443 }
 444
 445 static int s6e63m0_gamma_ctl(struct s6e63m0 *lcd, int gamma)
 446 {
 447         int ret = 0;
 448
 449         ret = _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
 450
 451         return ret;
 452 }
 453
 454
 455 static int s6e63m0_ldi_init(struct s6e63m0 *lcd)
 456 {
 457         int ret, i;
 458         const unsigned short *init_seq[] = {
 459                 SEQ_PANEL_CONDITION_SET,
 460                 SEQ_DISPLAY_CONDITION_SET,
 461                 SEQ_GAMMA_SETTING,
 462                 SEQ_ETC_CONDITION_SET,
 463                 SEQ_ACL_ON,
 464                 SEQ_ELVSS_ON,
 465         };
 466
 467         for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
 468                 ret = s6e63m0_panel_send_sequence(lcd, init_seq[i]);
 469                 if (ret)
 470                         break;
 471         }
 472
 473         return ret;
 474 }
 475
 476 static int s6e63m0_ldi_enable(struct s6e63m0 *lcd)
 477 {
 478         int ret = 0, i;
 479         const unsigned short *enable_seq[] = {
 480                 SEQ_STAND_BY_OFF,
 481                 SEQ_DISPLAY_ON,
 482         };
 483
 484         for (i = 0; i < ARRAY_SIZE(enable_seq); i++) {
 485                 ret = s6e63m0_panel_send_sequence(lcd, enable_seq[i]);
 486                 if (ret)
 487                         break;
 488         }
 489
 490         return ret;
 491 }
 492
 493 static int s6e63m0_ldi_disable(struct s6e63m0 *lcd)
 494 {
 495         int ret;
 496
 497         ret = s6e63m0_panel_send_sequence(lcd, SEQ_STAND_BY_ON);
 498
 499         return ret;
 500 }
 501
 502 static int s6e63m0_power_on(struct s6e63m0 *lcd)
 503 {
 504         int ret = 0;
 505         struct lcd_platform_data *pd = NULL;
 506         struct backlight_device *bd = NULL;
 507
 508         pd = lcd->lcd_pd;
 509         if (!pd) {
 510                 dev_err(lcd->dev, "platform data is NULL.\n");
 511                 return -EFAULT;
 512         }
 513
 514         bd = lcd->bd;
 515         if (!bd) {
 516                 dev_err(lcd->dev, "backlight device is NULL.\n");
 517                 return -EFAULT;
 518         }
 519
 520         if (!pd->power_on) {
 521                 dev_err(lcd->dev, "power_on is NULL.\n");
 522                 return -EFAULT;
 523         } else {
 524                 pd->power_on(lcd->ld, 1);
 525                 mdelay(pd->power_on_delay);
 526         }
 527
 528         if (!pd->reset) {
 529                 dev_err(lcd->dev, "reset is NULL.\n");
 530                 return -EFAULT;
 531         } else {
 532                 pd->reset(lcd->ld);
 533                 mdelay(pd->reset_delay);
 534         }
 535
 536         ret = s6e63m0_ldi_init(lcd);
 537         if (ret) {
 538                 dev_err(lcd->dev, "failed to initialize ldi.\n");
 539                 return ret;
 540         }
 541
 542         ret = s6e63m0_ldi_enable(lcd);
 543         if (ret) {
 544                 dev_err(lcd->dev, "failed to enable ldi.\n");
 545                 return ret;
 546         }
 547
 548         /* set brightness to current value after power on or resume. */
 549         ret = s6e63m0_gamma_ctl(lcd, bd->props.brightness);
 550         if (ret) {
 551                 dev_err(lcd->dev, "lcd gamma setting failed.\n");
 552                 return ret;
 553         }
 554
 555         return 0;
 556 }
 557
 558 static int s6e63m0_power_off(struct s6e63m0 *lcd)
 559 {
 560         int ret = 0;
 561         struct lcd_platform_data *pd = NULL;
 562
 563         pd = lcd->lcd_pd;
 564         if (!pd) {
 565                 dev_err(lcd->dev, "platform data is NULL.\n");
 566                 return -EFAULT;
 567         }
 568
 569         ret = s6e63m0_ldi_disable(lcd);
 570         if (ret) {
 571                 dev_err(lcd->dev, "lcd setting failed.\n");
 572                 return -EIO;
 573         }
 574
 575         mdelay(pd->power_off_delay);
 576
 577         if (!pd->power_on) {
 578                 dev_err(lcd->dev, "power_on is NULL.\n");
 579                 return -EFAULT;
 580         } else
 581                 pd->power_on(lcd->ld, 0);
 582
 583         return 0;
 584 }
 585
 586 static int s6e63m0_power(struct s6e63m0 *lcd, int power)
 587 {
 588         int ret = 0;
 589
 590         if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
 591                 ret = s6e63m0_power_on(lcd);
 592         else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
 593                 ret = s6e63m0_power_off(lcd);
 594
 595         if (!ret)
 596                 lcd->power = power;
 597
 598         return ret;
 599 }
 600
 601 static int s6e63m0_set_power(struct lcd_device *ld, int power)
 602 {
 603         struct s6e63m0 *lcd = lcd_get_data(ld);
 604
 605         if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
 606                 power != FB_BLANK_NORMAL) {
 607                 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
 608                 return -EINVAL;
 609         }
 610
 611         return s6e63m0_power(lcd, power);
 612 }
 613
 614 static int s6e63m0_get_power(struct lcd_device *ld)
 615 {
 616         struct s6e63m0 *lcd = lcd_get_data(ld);
 617
 618         return lcd->power;
 619 }
 620
 621 static int s6e63m0_get_brightness(struct backlight_device *bd)
 622 {
 623         return bd->props.brightness;
 624 }
 625
 626 static int s6e63m0_set_brightness(struct backlight_device *bd)
 627 {
 628         int ret = 0, brightness = bd->props.brightness;
 629         struct s6e63m0 *lcd = bl_get_data(bd);
 630
 631         if (brightness < MIN_BRIGHTNESS ||
 632                 brightness > bd->props.max_brightness) {
 633                 dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
 634                         MIN_BRIGHTNESS, MAX_BRIGHTNESS);
 635                 return -EINVAL;
 636         }
 637
 638         ret = s6e63m0_gamma_ctl(lcd, bd->props.brightness);
 639         if (ret) {
 640                 dev_err(&bd->dev, "lcd brightness setting failed.\n");
 641                 return -EIO;
 642         }
 643
 644         return ret;
 645 }
 646
 647 static struct lcd_ops s6e63m0_lcd_ops = {
 648         .set_power = s6e63m0_set_power,
 649         .get_power = s6e63m0_get_power,
 650 };
 651
 652 static const struct backlight_ops s6e63m0_backlight_ops  = {
 653         .get_brightness = s6e63m0_get_brightness,
 654         .update_status = s6e63m0_set_brightness,
 655 };
 656
 657 static ssize_t s6e63m0_sysfs_show_gamma_mode(struct device *dev,
 658                                       struct device_attribute *attr, char *buf)
 659 {
 660         struct s6e63m0 *lcd = dev_get_drvdata(dev);
 661         char temp[10];
 662
 663         switch (lcd->gamma_mode) {
 664         case 0:
 665                 sprintf(temp, "2.2 mode\n");
 666                 strcat(buf, temp);
 667                 break;
 668         case 1:
 669                 sprintf(temp, "1.9 mode\n");
 670                 strcat(buf, temp);
 671                 break;
 672         case 2:
 673                 sprintf(temp, "1.7 mode\n");
 674                 strcat(buf, temp);
 675                 break;
 676         default:
 677                 dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7)n");
 678                 break;
 679         }
 680
 681         return strlen(buf);
 682 }
 683
 684 static ssize_t s6e63m0_sysfs_store_gamma_mode(struct device *dev,
 685                                        struct device_attribute *attr,
 686                                        const char *buf, size_t len)
 687 {
 688         struct s6e63m0 *lcd = dev_get_drvdata(dev);
 689         struct backlight_device *bd = NULL;
 690         int brightness, rc;
 691
 692         rc = strict_strtoul(buf, 0, (unsigned long *)&lcd->gamma_mode);
 693         if (rc < 0)
 694                 return rc;
 695
 696         bd = lcd->bd;
 697
 698         brightness = bd->props.brightness;
 699
 700         switch (lcd->gamma_mode) {
 701         case 0:
 702                 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[brightness]);
 703                 break;
 704         case 1:
 705                 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_19_table[brightness]);
 706                 break;
 707         case 2:
 708                 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_17_table[brightness]);
 709                 break;
 710         default:
 711                 dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7\n");
 712                 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[brightness]);
 713                 break;
 714         }
 715         return len;
 716 }
 717
 718 static DEVICE_ATTR(gamma_mode, 0644,
 719                 s6e63m0_sysfs_show_gamma_mode, s6e63m0_sysfs_store_gamma_mode);
 720
 721 static ssize_t s6e63m0_sysfs_show_gamma_table(struct device *dev,
 722                                       struct device_attribute *attr, char *buf)
 723 {
 724         struct s6e63m0 *lcd = dev_get_drvdata(dev);
 725         char temp[3];
 726
 727         sprintf(temp, "%d\n", lcd->gamma_table_count);
 728         strcpy(buf, temp);
 729
 730         return strlen(buf);
 731 }
 732 static DEVICE_ATTR(gamma_table, 0644,
 733                 s6e63m0_sysfs_show_gamma_table, NULL);
 734
 735 static int __init s6e63m0_probe(struct spi_device *spi)
 736 {
 737         int ret = 0;
 738         struct s6e63m0 *lcd = NULL;
 739         struct lcd_device *ld = NULL;
 740         struct backlight_device *bd = NULL;
 741
 742         lcd = kzalloc(sizeof(struct s6e63m0), GFP_KERNEL);
 743         if (!lcd)
 744                 return -ENOMEM;
 745
 746         /* s6e63m0 lcd panel uses 3-wire 9bits SPI Mode. */
 747         spi->bits_per_word = 9;
 748
 749         ret = spi_setup(spi);
 750         if (ret < 0) {
 751                 dev_err(&spi->dev, "spi setup failed.\n");
 752                 goto out_free_lcd;
 753         }
 754
 755         lcd->spi = spi;
 756         lcd->dev = &spi->dev;
 757
 758         lcd->lcd_pd = (struct lcd_platform_data *)spi->dev.platform_data;
 759         if (!lcd->lcd_pd) {
 760                 dev_err(&spi->dev, "platform data is NULL.\n");
 761                 goto out_free_lcd;
 762         }
 763
 764         ld = lcd_device_register("s6e63m0", &spi->dev, lcd, &s6e63m0_lcd_ops);
 765         if (IS_ERR(ld)) {
 766                 ret = PTR_ERR(ld);
 767                 goto out_free_lcd;
 768         }
 769
 770         lcd->ld = ld;
 771
 772         bd = backlight_device_register("s6e63m0bl-bl", &spi->dev, lcd,
 773                 &s6e63m0_backlight_ops, NULL);
 774         if (IS_ERR(bd)) {
 775                 ret =  PTR_ERR(bd);
 776                 goto out_lcd_unregister;
 777         }
 778
 779         bd->props.max_brightness = MAX_BRIGHTNESS;
 780         bd->props.brightness = MAX_BRIGHTNESS;
 781         lcd->bd = bd;
 782
 783         /*
 784          * it gets gamma table count available so it gets user
 785          * know that.
 786          */
 787         lcd->gamma_table_count =
 788             sizeof(gamma_table) / (MAX_GAMMA_LEVEL * sizeof(int));
 789
 790         ret = device_create_file(&(spi->dev), &dev_attr_gamma_mode);
 791         if (ret < 0)
 792                 dev_err(&(spi->dev), "failed to add sysfs entries\n");
 793
 794         ret = device_create_file(&(spi->dev), &dev_attr_gamma_table);
 795         if (ret < 0)
 796                 dev_err(&(spi->dev), "failed to add sysfs entries\n");
 797
 798         /*
 799          * if lcd panel was on from bootloader like u-boot then
 800          * do not lcd on.
 801          */
 802         if (!lcd->lcd_pd->lcd_enabled) {
 803                 /*
 804                  * if lcd panel was off from bootloader then
 805                  * current lcd status is powerdown and then
 806                  * it enables lcd panel.
 807                  */
 808                 lcd->power = FB_BLANK_POWERDOWN;
 809
 810                 s6e63m0_power(lcd, FB_BLANK_UNBLANK);
 811         } else
 812                 lcd->power = FB_BLANK_UNBLANK;
 813
 814         dev_set_drvdata(&spi->dev, lcd);
 815
 816         dev_info(&spi->dev, "s6e63m0 panel driver has been probed.\n");
 817
 818         return 0;
 819
 820 out_lcd_unregister:
 821         lcd_device_unregister(ld);
 822 out_free_lcd:
 823         kfree(lcd);
 824         return ret;
 825 }
 826
 827 static int __devexit s6e63m0_remove(struct spi_device *spi)
 828 {
 829         struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
 830
 831         s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
 832         lcd_device_unregister(lcd->ld);
 833         kfree(lcd);
 834
 835         return 0;
 836 }
 837
 838 #if defined(CONFIG_PM)
 839 unsigned int before_power;
 840
 841 static int s6e63m0_suspend(struct spi_device *spi, pm_message_t mesg)
 842 {
 843         int ret = 0;
 844         struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
 845
 846         dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
 847
 848         before_power = lcd->power;
 849
 850         /*
 851          * when lcd panel is suspend, lcd panel becomes off
 852          * regardless of status.
 853          */
 854         ret = s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
 855
 856         return ret;
 857 }
 858
 859 static int s6e63m0_resume(struct spi_device *spi)
 860 {
 861         int ret = 0;
 862         struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
 863
 864         /*
 865          * after suspended, if lcd panel status is FB_BLANK_UNBLANK
 866          * (at that time, before_power is FB_BLANK_UNBLANK) then
 867          * it changes that status to FB_BLANK_POWERDOWN to get lcd on.
 868          */
 869         if (before_power == FB_BLANK_UNBLANK)
 870                 lcd->power = FB_BLANK_POWERDOWN;
 871
 872         dev_dbg(&spi->dev, "before_power = %d\n", before_power);
 873
 874         ret = s6e63m0_power(lcd, before_power);
 875
 876         return ret;
 877 }
 878 #else
 879 #define s6e63m0_suspend         NULL
 880 #define s6e63m0_resume          NULL
 881 #endif
 882
 883 /* Power down all displays on reboot, poweroff or halt. */
 884 static void s6e63m0_shutdown(struct spi_device *spi)
 885 {
 886         struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
 887
 888         s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
 889 }
 890
 891 static struct spi_driver s6e63m0_driver = {
 892         .driver = {
 893                 .name   = "s6e63m0",
 894                 .bus    = &spi_bus_type,
 895                 .owner  = THIS_MODULE,
 896         },
 897         .probe          = s6e63m0_probe,
 898         .remove         = __devexit_p(s6e63m0_remove),
 899         .shutdown       = s6e63m0_shutdown,
 900         .suspend        = s6e63m0_suspend,
 901         .resume         = s6e63m0_resume,
 902 };
 903
 904 static int __init s6e63m0_init(void)
 905 {
 906         return spi_register_driver(&s6e63m0_driver);
 907 }
 908
 909 static void __exit s6e63m0_exit(void)
 910 {
 911         spi_unregister_driver(&s6e63m0_driver);
 912 }
 913
 914 module_init(s6e63m0_init);
 915 module_exit(s6e63m0_exit);
 916
 917 MODULE_AUTHOR("InKi Dae <inki.dae@samsung.com>");
 918 MODULE_DESCRIPTION("S6E63M0 LCD Driver");
 919 MODULE_LICENSE("GPL");