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 #include <linux/module.h>
  34
  35 #include "s6e63m0_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          10
  45
  46 #define POWER_IS_ON(pwr)        ((pwr) <= FB_BLANK_NORMAL)
  47
  48 struct s6e63m0 {
  49         struct device                   *dev;
  50         struct spi_device               *spi;
  51         unsigned int                    power;
  52         unsigned int                    current_brightness;
  53         unsigned int                    gamma_mode;
  54         unsigned int                    gamma_table_count;
  55         struct lcd_device               *ld;
  56         struct backlight_device         *bd;
  57         struct lcd_platform_data        *lcd_pd;
  58 };
  59
  60 static const unsigned short SEQ_PANEL_CONDITION_SET[] = {
  61         0xF8, 0x01,
  62         DATA_ONLY, 0x27,
  63         DATA_ONLY, 0x27,
  64         DATA_ONLY, 0x07,
  65         DATA_ONLY, 0x07,
  66         DATA_ONLY, 0x54,
  67         DATA_ONLY, 0x9f,
  68         DATA_ONLY, 0x63,
  69         DATA_ONLY, 0x86,
  70         DATA_ONLY, 0x1a,
  71         DATA_ONLY, 0x33,
  72         DATA_ONLY, 0x0d,
  73         DATA_ONLY, 0x00,
  74         DATA_ONLY, 0x00,
  75
  76         ENDDEF, 0x0000
  77 };
  78
  79 static const unsigned short SEQ_DISPLAY_CONDITION_SET[] = {
  80         0xf2, 0x02,
  81         DATA_ONLY, 0x03,
  82         DATA_ONLY, 0x1c,
  83         DATA_ONLY, 0x10,
  84         DATA_ONLY, 0x10,
  85
  86         0xf7, 0x03,
  87         DATA_ONLY, 0x00,
  88         DATA_ONLY, 0x00,
  89
  90         ENDDEF, 0x0000
  91 };
  92
  93 static const unsigned short SEQ_GAMMA_SETTING[] = {
  94         0xfa, 0x00,
  95         DATA_ONLY, 0x18,
  96         DATA_ONLY, 0x08,
  97         DATA_ONLY, 0x24,
  98         DATA_ONLY, 0x64,
  99         DATA_ONLY, 0x56,
 100         DATA_ONLY, 0x33,
 101         DATA_ONLY, 0xb6,
 102         DATA_ONLY, 0xba,
 103         DATA_ONLY, 0xa8,
 104         DATA_ONLY, 0xac,
 105         DATA_ONLY, 0xb1,
 106         DATA_ONLY, 0x9d,
 107         DATA_ONLY, 0xc1,
 108         DATA_ONLY, 0xc1,
 109         DATA_ONLY, 0xb7,
 110         DATA_ONLY, 0x00,
 111         DATA_ONLY, 0x9c,
 112         DATA_ONLY, 0x00,
 113         DATA_ONLY, 0x9f,
 114         DATA_ONLY, 0x00,
 115         DATA_ONLY, 0xd6,
 116
 117         0xfa, 0x01,
 118
 119         ENDDEF, 0x0000
 120 };
 121
 122 static const unsigned short SEQ_ETC_CONDITION_SET[] = {
 123         0xf6, 0x00,
 124         DATA_ONLY, 0x8c,
 125         DATA_ONLY, 0x07,
 126
 127         0xb3, 0xc,
 128
 129         0xb5, 0x2c,
 130         DATA_ONLY, 0x12,
 131         DATA_ONLY, 0x0c,
 132         DATA_ONLY, 0x0a,
 133         DATA_ONLY, 0x10,
 134         DATA_ONLY, 0x0e,
 135         DATA_ONLY, 0x17,
 136         DATA_ONLY, 0x13,
 137         DATA_ONLY, 0x1f,
 138         DATA_ONLY, 0x1a,
 139         DATA_ONLY, 0x2a,
 140         DATA_ONLY, 0x24,
 141         DATA_ONLY, 0x1f,
 142         DATA_ONLY, 0x1b,
 143         DATA_ONLY, 0x1a,
 144         DATA_ONLY, 0x17,
 145
 146         DATA_ONLY, 0x2b,
 147         DATA_ONLY, 0x26,
 148         DATA_ONLY, 0x22,
 149         DATA_ONLY, 0x20,
 150         DATA_ONLY, 0x3a,
 151         DATA_ONLY, 0x34,
 152         DATA_ONLY, 0x30,
 153         DATA_ONLY, 0x2c,
 154         DATA_ONLY, 0x29,
 155         DATA_ONLY, 0x26,
 156         DATA_ONLY, 0x25,
 157         DATA_ONLY, 0x23,
 158         DATA_ONLY, 0x21,
 159         DATA_ONLY, 0x20,
 160         DATA_ONLY, 0x1e,
 161         DATA_ONLY, 0x1e,
 162
 163         0xb6, 0x00,
 164         DATA_ONLY, 0x00,
 165         DATA_ONLY, 0x11,
 166         DATA_ONLY, 0x22,
 167         DATA_ONLY, 0x33,
 168         DATA_ONLY, 0x44,
 169         DATA_ONLY, 0x44,
 170         DATA_ONLY, 0x44,
 171
 172         DATA_ONLY, 0x55,
 173         DATA_ONLY, 0x55,
 174         DATA_ONLY, 0x66,
 175         DATA_ONLY, 0x66,
 176         DATA_ONLY, 0x66,
 177         DATA_ONLY, 0x66,
 178         DATA_ONLY, 0x66,
 179         DATA_ONLY, 0x66,
 180
 181         0xb7, 0x2c,
 182         DATA_ONLY, 0x12,
 183         DATA_ONLY, 0x0c,
 184         DATA_ONLY, 0x0a,
 185         DATA_ONLY, 0x10,
 186         DATA_ONLY, 0x0e,
 187         DATA_ONLY, 0x17,
 188         DATA_ONLY, 0x13,
 189         DATA_ONLY, 0x1f,
 190         DATA_ONLY, 0x1a,
 191         DATA_ONLY, 0x2a,
 192         DATA_ONLY, 0x24,
 193         DATA_ONLY, 0x1f,
 194         DATA_ONLY, 0x1b,
 195         DATA_ONLY, 0x1a,
 196         DATA_ONLY, 0x17,
 197
 198         DATA_ONLY, 0x2b,
 199         DATA_ONLY, 0x26,
 200         DATA_ONLY, 0x22,
 201         DATA_ONLY, 0x20,
 202         DATA_ONLY, 0x3a,
 203         DATA_ONLY, 0x34,
 204         DATA_ONLY, 0x30,
 205         DATA_ONLY, 0x2c,
 206         DATA_ONLY, 0x29,
 207         DATA_ONLY, 0x26,
 208         DATA_ONLY, 0x25,
 209         DATA_ONLY, 0x23,
 210         DATA_ONLY, 0x21,
 211         DATA_ONLY, 0x20,
 212         DATA_ONLY, 0x1e,
 213         DATA_ONLY, 0x1e,
 214
 215         0xb8, 0x00,
 216         DATA_ONLY, 0x00,
 217         DATA_ONLY, 0x11,
 218         DATA_ONLY, 0x22,
 219         DATA_ONLY, 0x33,
 220         DATA_ONLY, 0x44,
 221         DATA_ONLY, 0x44,
 222         DATA_ONLY, 0x44,
 223
 224         DATA_ONLY, 0x55,
 225         DATA_ONLY, 0x55,
 226         DATA_ONLY, 0x66,
 227         DATA_ONLY, 0x66,
 228         DATA_ONLY, 0x66,
 229         DATA_ONLY, 0x66,
 230         DATA_ONLY, 0x66,
 231         DATA_ONLY, 0x66,
 232
 233         0xb9, 0x2c,
 234         DATA_ONLY, 0x12,
 235         DATA_ONLY, 0x0c,
 236         DATA_ONLY, 0x0a,
 237         DATA_ONLY, 0x10,
 238         DATA_ONLY, 0x0e,
 239         DATA_ONLY, 0x17,
 240         DATA_ONLY, 0x13,
 241         DATA_ONLY, 0x1f,
 242         DATA_ONLY, 0x1a,
 243         DATA_ONLY, 0x2a,
 244         DATA_ONLY, 0x24,
 245         DATA_ONLY, 0x1f,
 246         DATA_ONLY, 0x1b,
 247         DATA_ONLY, 0x1a,
 248         DATA_ONLY, 0x17,
 249
 250         DATA_ONLY, 0x2b,
 251         DATA_ONLY, 0x26,
 252         DATA_ONLY, 0x22,
 253         DATA_ONLY, 0x20,
 254         DATA_ONLY, 0x3a,
 255         DATA_ONLY, 0x34,
 256         DATA_ONLY, 0x30,
 257         DATA_ONLY, 0x2c,
 258         DATA_ONLY, 0x29,
 259         DATA_ONLY, 0x26,
 260         DATA_ONLY, 0x25,
 261         DATA_ONLY, 0x23,
 262         DATA_ONLY, 0x21,
 263         DATA_ONLY, 0x20,
 264         DATA_ONLY, 0x1e,
 265         DATA_ONLY, 0x1e,
 266
 267         0xba, 0x00,
 268         DATA_ONLY, 0x00,
 269         DATA_ONLY, 0x11,
 270         DATA_ONLY, 0x22,
 271         DATA_ONLY, 0x33,
 272         DATA_ONLY, 0x44,
 273         DATA_ONLY, 0x44,
 274         DATA_ONLY, 0x44,
 275
 276         DATA_ONLY, 0x55,
 277         DATA_ONLY, 0x55,
 278         DATA_ONLY, 0x66,
 279         DATA_ONLY, 0x66,
 280         DATA_ONLY, 0x66,
 281         DATA_ONLY, 0x66,
 282         DATA_ONLY, 0x66,
 283         DATA_ONLY, 0x66,
 284
 285         0xc1, 0x4d,
 286         DATA_ONLY, 0x96,
 287         DATA_ONLY, 0x1d,
 288         DATA_ONLY, 0x00,
 289         DATA_ONLY, 0x00,
 290         DATA_ONLY, 0x01,
 291         DATA_ONLY, 0xdf,
 292         DATA_ONLY, 0x00,
 293         DATA_ONLY, 0x00,
 294         DATA_ONLY, 0x03,
 295         DATA_ONLY, 0x1f,
 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, 0x00,
 304         DATA_ONLY, 0x03,
 305         DATA_ONLY, 0x06,
 306         DATA_ONLY, 0x09,
 307         DATA_ONLY, 0x0d,
 308         DATA_ONLY, 0x0f,
 309         DATA_ONLY, 0x12,
 310         DATA_ONLY, 0x15,
 311         DATA_ONLY, 0x18,
 312
 313         0xb2, 0x10,
 314         DATA_ONLY, 0x10,
 315         DATA_ONLY, 0x0b,
 316         DATA_ONLY, 0x05,
 317
 318         ENDDEF, 0x0000
 319 };
 320
 321 static const unsigned short SEQ_ACL_ON[] = {
 322         /* ACL on */
 323         0xc0, 0x01,
 324
 325         ENDDEF, 0x0000
 326 };
 327
 328 static const unsigned short SEQ_ACL_OFF[] = {
 329         /* ACL off */
 330         0xc0, 0x00,
 331
 332         ENDDEF, 0x0000
 333 };
 334
 335 static const unsigned short SEQ_ELVSS_ON[] = {
 336         /* ELVSS on */
 337         0xb1, 0x0b,
 338
 339         ENDDEF, 0x0000
 340 };
 341
 342 static const unsigned short SEQ_ELVSS_OFF[] = {
 343         /* ELVSS off */
 344         0xb1, 0x0a,
 345
 346         ENDDEF, 0x0000
 347 };
 348
 349 static const unsigned short SEQ_STAND_BY_OFF[] = {
 350         0x11, COMMAND_ONLY,
 351
 352         ENDDEF, 0x0000
 353 };
 354
 355 static const unsigned short SEQ_STAND_BY_ON[] = {
 356         0x10, COMMAND_ONLY,
 357
 358         ENDDEF, 0x0000
 359 };
 360
 361 static const unsigned short SEQ_DISPLAY_ON[] = {
 362         0x29, COMMAND_ONLY,
 363
 364         ENDDEF, 0x0000
 365 };
 366
 367
 368 static int s6e63m0_spi_write_byte(struct s6e63m0 *lcd, int addr, int data)
 369 {
 370         u16 buf[1];
 371         struct spi_message msg;
 372
 373         struct spi_transfer xfer = {
 374                 .len            = 2,
 375                 .tx_buf         = buf,
 376         };
 377
 378         buf[0] = (addr << 8) | data;
 379
 380         spi_message_init(&msg);
 381         spi_message_add_tail(&xfer, &msg);
 382
 383         return spi_sync(lcd->spi, &msg);
 384 }
 385
 386 static int s6e63m0_spi_write(struct s6e63m0 *lcd, unsigned char address,
 387         unsigned char command)
 388 {
 389         int ret = 0;
 390
 391         if (address != DATA_ONLY)
 392                 ret = s6e63m0_spi_write_byte(lcd, 0x0, address);
 393         if (command != COMMAND_ONLY)
 394                 ret = s6e63m0_spi_write_byte(lcd, 0x1, command);
 395
 396         return ret;
 397 }
 398
 399 static int s6e63m0_panel_send_sequence(struct s6e63m0 *lcd,
 400         const unsigned short *wbuf)
 401 {
 402         int ret = 0, i = 0;
 403
 404         while ((wbuf[i] & DEFMASK) != ENDDEF) {
 405                 if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
 406                         ret = s6e63m0_spi_write(lcd, wbuf[i], wbuf[i+1]);
 407                         if (ret)
 408                                 break;
 409                 } else
 410                         udelay(wbuf[i+1]*1000);
 411                 i += 2;
 412         }
 413
 414         return ret;
 415 }
 416
 417 static int _s6e63m0_gamma_ctl(struct s6e63m0 *lcd, const unsigned int *gamma)
 418 {
 419         unsigned int i = 0;
 420         int ret = 0;
 421
 422         /* disable gamma table updating. */
 423         ret = s6e63m0_spi_write(lcd, 0xfa, 0x00);
 424         if (ret) {
 425                 dev_err(lcd->dev, "failed to disable gamma table updating.\n");
 426                 goto gamma_err;
 427         }
 428
 429         for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
 430                 ret = s6e63m0_spi_write(lcd, DATA_ONLY, gamma[i]);
 431                 if (ret) {
 432                         dev_err(lcd->dev, "failed to set gamma table.\n");
 433                         goto gamma_err;
 434                 }
 435         }
 436
 437         /* update gamma table. */
 438         ret = s6e63m0_spi_write(lcd, 0xfa, 0x01);
 439         if (ret)
 440                 dev_err(lcd->dev, "failed to update gamma table.\n");
 441
 442 gamma_err:
 443         return ret;
 444 }
 445
 446 static int s6e63m0_gamma_ctl(struct s6e63m0 *lcd, int gamma)
 447 {
 448         int ret = 0;
 449
 450         ret = _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
 451
 452         return ret;
 453 }
 454
 455
 456 static int s6e63m0_ldi_init(struct s6e63m0 *lcd)
 457 {
 458         int ret, i;
 459         const unsigned short *init_seq[] = {
 460                 SEQ_PANEL_CONDITION_SET,
 461                 SEQ_DISPLAY_CONDITION_SET,
 462                 SEQ_GAMMA_SETTING,
 463                 SEQ_ETC_CONDITION_SET,
 464                 SEQ_ACL_ON,
 465                 SEQ_ELVSS_ON,
 466         };
 467
 468         for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
 469                 ret = s6e63m0_panel_send_sequence(lcd, init_seq[i]);
 470                 if (ret)
 471                         break;
 472         }
 473
 474         return ret;
 475 }
 476
 477 static int s6e63m0_ldi_enable(struct s6e63m0 *lcd)
 478 {
 479         int ret = 0, i;
 480         const unsigned short *enable_seq[] = {
 481                 SEQ_STAND_BY_OFF,
 482                 SEQ_DISPLAY_ON,
 483         };
 484
 485         for (i = 0; i < ARRAY_SIZE(enable_seq); i++) {
 486                 ret = s6e63m0_panel_send_sequence(lcd, enable_seq[i]);
 487                 if (ret)
 488                         break;
 489         }
 490
 491         return ret;
 492 }
 493
 494 static int s6e63m0_ldi_disable(struct s6e63m0 *lcd)
 495 {
 496         int ret;
 497
 498         ret = s6e63m0_panel_send_sequence(lcd, SEQ_STAND_BY_ON);
 499
 500         return ret;
 501 }
 502
 503 static int s6e63m0_power_on(struct s6e63m0 *lcd)
 504 {
 505         int ret = 0;
 506         struct lcd_platform_data *pd = NULL;
 507         struct backlight_device *bd = NULL;
 508
 509         pd = lcd->lcd_pd;
 510         if (!pd) {
 511                 dev_err(lcd->dev, "platform data is NULL.\n");
 512                 return -EFAULT;
 513         }
 514
 515         bd = lcd->bd;
 516         if (!bd) {
 517                 dev_err(lcd->dev, "backlight device is NULL.\n");
 518                 return -EFAULT;
 519         }
 520
 521         if (!pd->power_on) {
 522                 dev_err(lcd->dev, "power_on is NULL.\n");
 523                 return -EFAULT;
 524         } else {
 525                 pd->power_on(lcd->ld, 1);
 526                 mdelay(pd->power_on_delay);
 527         }
 528
 529         if (!pd->reset) {
 530                 dev_err(lcd->dev, "reset is NULL.\n");
 531                 return -EFAULT;
 532         } else {
 533                 pd->reset(lcd->ld);
 534                 mdelay(pd->reset_delay);
 535         }
 536
 537         ret = s6e63m0_ldi_init(lcd);
 538         if (ret) {
 539                 dev_err(lcd->dev, "failed to initialize ldi.\n");
 540                 return ret;
 541         }
 542
 543         ret = s6e63m0_ldi_enable(lcd);
 544         if (ret) {
 545                 dev_err(lcd->dev, "failed to enable ldi.\n");
 546                 return ret;
 547         }
 548
 549         /* set brightness to current value after power on or resume. */
 550         ret = s6e63m0_gamma_ctl(lcd, bd->props.brightness);
 551         if (ret) {
 552                 dev_err(lcd->dev, "lcd gamma setting failed.\n");
 553                 return ret;
 554         }
 555
 556         return 0;
 557 }
 558
 559 static int s6e63m0_power_off(struct s6e63m0 *lcd)
 560 {
 561         int ret = 0;
 562         struct lcd_platform_data *pd = NULL;
 563
 564         pd = lcd->lcd_pd;
 565         if (!pd) {
 566                 dev_err(lcd->dev, "platform data is NULL.\n");
 567                 return -EFAULT;
 568         }
 569
 570         ret = s6e63m0_ldi_disable(lcd);
 571         if (ret) {
 572                 dev_err(lcd->dev, "lcd setting failed.\n");
 573                 return -EIO;
 574         }
 575
 576         mdelay(pd->power_off_delay);
 577
 578         if (!pd->power_on) {
 579                 dev_err(lcd->dev, "power_on is NULL.\n");
 580                 return -EFAULT;
 581         } else
 582                 pd->power_on(lcd->ld, 0);
 583
 584         return 0;
 585 }
 586
 587 static int s6e63m0_power(struct s6e63m0 *lcd, int power)
 588 {
 589         int ret = 0;
 590
 591         if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
 592                 ret = s6e63m0_power_on(lcd);
 593         else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
 594                 ret = s6e63m0_power_off(lcd);
 595
 596         if (!ret)
 597                 lcd->power = power;
 598
 599         return ret;
 600 }
 601
 602 static int s6e63m0_set_power(struct lcd_device *ld, int power)
 603 {
 604         struct s6e63m0 *lcd = lcd_get_data(ld);
 605
 606         if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
 607                 power != FB_BLANK_NORMAL) {
 608                 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
 609                 return -EINVAL;
 610         }
 611
 612         return s6e63m0_power(lcd, power);
 613 }
 614
 615 static int s6e63m0_get_power(struct lcd_device *ld)
 616 {
 617         struct s6e63m0 *lcd = lcd_get_data(ld);
 618
 619         return lcd->power;
 620 }
 621
 622 static int s6e63m0_get_brightness(struct backlight_device *bd)
 623 {
 624         return bd->props.brightness;
 625 }
 626
 627 static int s6e63m0_set_brightness(struct backlight_device *bd)
 628 {
 629         int ret = 0, brightness = bd->props.brightness;
 630         struct s6e63m0 *lcd = bl_get_data(bd);
 631
 632         if (brightness < MIN_BRIGHTNESS ||
 633                 brightness > bd->props.max_brightness) {
 634                 dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
 635                         MIN_BRIGHTNESS, MAX_BRIGHTNESS);
 636                 return -EINVAL;
 637         }
 638
 639         ret = s6e63m0_gamma_ctl(lcd, bd->props.brightness);
 640         if (ret) {
 641                 dev_err(&bd->dev, "lcd brightness setting failed.\n");
 642                 return -EIO;
 643         }
 644
 645         return ret;
 646 }
 647
 648 static struct lcd_ops s6e63m0_lcd_ops = {
 649         .set_power = s6e63m0_set_power,
 650         .get_power = s6e63m0_get_power,
 651 };
 652
 653 static const struct backlight_ops s6e63m0_backlight_ops  = {
 654         .get_brightness = s6e63m0_get_brightness,
 655         .update_status = s6e63m0_set_brightness,
 656 };
 657
 658 static ssize_t s6e63m0_sysfs_show_gamma_mode(struct device *dev,
 659                                       struct device_attribute *attr, char *buf)
 660 {
 661         struct s6e63m0 *lcd = dev_get_drvdata(dev);
 662         char temp[10];
 663
 664         switch (lcd->gamma_mode) {
 665         case 0:
 666                 sprintf(temp, "2.2 mode\n");
 667                 strcat(buf, temp);
 668                 break;
 669         case 1:
 670                 sprintf(temp, "1.9 mode\n");
 671                 strcat(buf, temp);
 672                 break;
 673         case 2:
 674                 sprintf(temp, "1.7 mode\n");
 675                 strcat(buf, temp);
 676                 break;
 677         default:
 678                 dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7)n");
 679                 break;
 680         }
 681
 682         return strlen(buf);
 683 }
 684
 685 static ssize_t s6e63m0_sysfs_store_gamma_mode(struct device *dev,
 686                                        struct device_attribute *attr,
 687                                        const char *buf, size_t len)
 688 {
 689         struct s6e63m0 *lcd = dev_get_drvdata(dev);
 690         struct backlight_device *bd = NULL;
 691         int brightness, rc;
 692
 693         rc = strict_strtoul(buf, 0, (unsigned long *)&lcd->gamma_mode);
 694         if (rc < 0)
 695                 return rc;
 696
 697         bd = lcd->bd;
 698
 699         brightness = bd->props.brightness;
 700
 701         switch (lcd->gamma_mode) {
 702         case 0:
 703                 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[brightness]);
 704                 break;
 705         case 1:
 706                 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_19_table[brightness]);
 707                 break;
 708         case 2:
 709                 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_17_table[brightness]);
 710                 break;
 711         default:
 712                 dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7\n");
 713                 _s6e63m0_gamma_ctl(lcd, gamma_table.gamma_22_table[brightness]);
 714                 break;
 715         }
 716         return len;
 717 }
 718
 719 static DEVICE_ATTR(gamma_mode, 0644,
 720                 s6e63m0_sysfs_show_gamma_mode, s6e63m0_sysfs_store_gamma_mode);
 721
 722 static ssize_t s6e63m0_sysfs_show_gamma_table(struct device *dev,
 723                                       struct device_attribute *attr, char *buf)
 724 {
 725         struct s6e63m0 *lcd = dev_get_drvdata(dev);
 726         char temp[3];
 727
 728         sprintf(temp, "%d\n", lcd->gamma_table_count);
 729         strcpy(buf, temp);
 730
 731         return strlen(buf);
 732 }
 733 static DEVICE_ATTR(gamma_table, 0444,
 734                 s6e63m0_sysfs_show_gamma_table, NULL);
 735
 736 static int __devinit s6e63m0_probe(struct spi_device *spi)
 737 {
 738         int ret = 0;
 739         struct s6e63m0 *lcd = NULL;
 740         struct lcd_device *ld = NULL;
 741         struct backlight_device *bd = NULL;
 742         struct backlight_properties props;
 743
 744         lcd = kzalloc(sizeof(struct s6e63m0), GFP_KERNEL);
 745         if (!lcd)
 746                 return -ENOMEM;
 747
 748         /* s6e63m0 lcd panel uses 3-wire 9bits SPI Mode. */
 749         spi->bits_per_word = 9;
 750
 751         ret = spi_setup(spi);
 752         if (ret < 0) {
 753                 dev_err(&spi->dev, "spi setup failed.\n");
 754                 goto out_free_lcd;
 755         }
 756
 757         lcd->spi = spi;
 758         lcd->dev = &spi->dev;
 759
 760         lcd->lcd_pd = (struct lcd_platform_data *)spi->dev.platform_data;
 761         if (!lcd->lcd_pd) {
 762                 dev_err(&spi->dev, "platform data is NULL.\n");
 763                 goto out_free_lcd;
 764         }
 765
 766         ld = lcd_device_register("s6e63m0", &spi->dev, lcd, &s6e63m0_lcd_ops);
 767         if (IS_ERR(ld)) {
 768                 ret = PTR_ERR(ld);
 769                 goto out_free_lcd;
 770         }
 771
 772         lcd->ld = ld;
 773
 774         memset(&props, 0, sizeof(struct backlight_properties));
 775         props.type = BACKLIGHT_RAW;
 776         props.max_brightness = MAX_BRIGHTNESS;
 777
 778         bd = backlight_device_register("s6e63m0bl-bl", &spi->dev, lcd,
 779                 &s6e63m0_backlight_ops, &props);
 780         if (IS_ERR(bd)) {
 781                 ret =  PTR_ERR(bd);
 782                 goto out_lcd_unregister;
 783         }
 784
 785         bd->props.brightness = MAX_BRIGHTNESS;
 786         lcd->bd = bd;
 787
 788         /*
 789          * it gets gamma table count available so it gets user
 790          * know that.
 791          */
 792         lcd->gamma_table_count =
 793             sizeof(gamma_table) / (MAX_GAMMA_LEVEL * sizeof(int));
 794
 795         ret = device_create_file(&(spi->dev), &dev_attr_gamma_mode);
 796         if (ret < 0)
 797                 dev_err(&(spi->dev), "failed to add sysfs entries\n");
 798
 799         ret = device_create_file(&(spi->dev), &dev_attr_gamma_table);
 800         if (ret < 0)
 801                 dev_err(&(spi->dev), "failed to add sysfs entries\n");
 802
 803         /*
 804          * if lcd panel was on from bootloader like u-boot then
 805          * do not lcd on.
 806          */
 807         if (!lcd->lcd_pd->lcd_enabled) {
 808                 /*
 809                  * if lcd panel was off from bootloader then
 810                  * current lcd status is powerdown and then
 811                  * it enables lcd panel.
 812                  */
 813                 lcd->power = FB_BLANK_POWERDOWN;
 814
 815                 s6e63m0_power(lcd, FB_BLANK_UNBLANK);
 816         } else
 817                 lcd->power = FB_BLANK_UNBLANK;
 818
 819         dev_set_drvdata(&spi->dev, lcd);
 820
 821         dev_info(&spi->dev, "s6e63m0 panel driver has been probed.\n");
 822
 823         return 0;
 824
 825 out_lcd_unregister:
 826         lcd_device_unregister(ld);
 827 out_free_lcd:
 828         kfree(lcd);
 829         return ret;
 830 }
 831
 832 static int __devexit s6e63m0_remove(struct spi_device *spi)
 833 {
 834         struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
 835
 836         s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
 837         device_remove_file(&spi->dev, &dev_attr_gamma_table);
 838         device_remove_file(&spi->dev, &dev_attr_gamma_mode);
 839         backlight_device_unregister(lcd->bd);
 840         lcd_device_unregister(lcd->ld);
 841         kfree(lcd);
 842
 843         return 0;
 844 }
 845
 846 #if defined(CONFIG_PM)
 847 static unsigned int before_power;
 848
 849 static int s6e63m0_suspend(struct spi_device *spi, pm_message_t mesg)
 850 {
 851         int ret = 0;
 852         struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
 853
 854         dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);
 855
 856         before_power = lcd->power;
 857
 858         /*
 859          * when lcd panel is suspend, lcd panel becomes off
 860          * regardless of status.
 861          */
 862         ret = s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
 863
 864         return ret;
 865 }
 866
 867 static int s6e63m0_resume(struct spi_device *spi)
 868 {
 869         int ret = 0;
 870         struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
 871
 872         /*
 873          * after suspended, if lcd panel status is FB_BLANK_UNBLANK
 874          * (at that time, before_power is FB_BLANK_UNBLANK) then
 875          * it changes that status to FB_BLANK_POWERDOWN to get lcd on.
 876          */
 877         if (before_power == FB_BLANK_UNBLANK)
 878                 lcd->power = FB_BLANK_POWERDOWN;
 879
 880         dev_dbg(&spi->dev, "before_power = %d\n", before_power);
 881
 882         ret = s6e63m0_power(lcd, before_power);
 883
 884         return ret;
 885 }
 886 #else
 887 #define s6e63m0_suspend         NULL
 888 #define s6e63m0_resume          NULL
 889 #endif
 890
 891 /* Power down all displays on reboot, poweroff or halt. */
 892 static void s6e63m0_shutdown(struct spi_device *spi)
 893 {
 894         struct s6e63m0 *lcd = dev_get_drvdata(&spi->dev);
 895
 896         s6e63m0_power(lcd, FB_BLANK_POWERDOWN);
 897 }
 898
 899 static struct spi_driver s6e63m0_driver = {
 900         .driver = {
 901                 .name   = "s6e63m0",
 902                 .bus    = &spi_bus_type,
 903                 .owner  = THIS_MODULE,
 904         },
 905         .probe          = s6e63m0_probe,
 906         .remove         = __devexit_p(s6e63m0_remove),
 907         .shutdown       = s6e63m0_shutdown,
 908         .suspend        = s6e63m0_suspend,
 909         .resume         = s6e63m0_resume,
 910 };
 911
 912 static int __init s6e63m0_init(void)
 913 {
 914         return spi_register_driver(&s6e63m0_driver);
 915 }
 916
 917 static void __exit s6e63m0_exit(void)
 918 {
 919         spi_unregister_driver(&s6e63m0_driver);
 920 }
 921
 922 module_init(s6e63m0_init);
 923 module_exit(s6e63m0_exit);
 924
 925 MODULE_AUTHOR("InKi Dae <inki.dae@samsung.com>");
 926 MODULE_DESCRIPTION("S6E63M0 LCD Driver");
 927 MODULE_LICENSE("GPL");
 928