drivers/video/backlight/lms501kf03.c

   1 /*
   2  * lms501kf03 TFT LCD panel driver.
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  * Author: Jingoo Han  <jg1.han@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/backlight.h>
  14 #include <linux/delay.h>
  15 #include <linux/fb.h>
  16 #include <linux/gpio.h>
  17 #include <linux/lcd.h>
  18 #include <linux/module.h>
  19 #include <linux/spi/spi.h>
  20 #include <linux/wait.h>
  21
  22 #define COMMAND_ONLY            0x00
  23 #define DATA_ONLY               0x01
  24
  25 struct lms501kf03 {
  26         struct device                   *dev;
  27         struct spi_device               *spi;
  28         unsigned int                    power;
  29         struct lcd_device               *ld;
  30         struct lcd_platform_data        *lcd_pd;
  31 };
  32
  33 static const unsigned char seq_password[] = {
  34         0xb9, 0xff, 0x83, 0x69,
  35 };
  36
  37 static const unsigned char seq_power[] = {
  38         0xb1, 0x01, 0x00, 0x34, 0x06, 0x00, 0x14, 0x14, 0x20, 0x28,
  39         0x12, 0x12, 0x17, 0x0a, 0x01, 0xe6, 0xe6, 0xe6, 0xe6, 0xe6,
  40 };
  41
  42 static const unsigned char seq_display[] = {
  43         0xb2, 0x00, 0x2b, 0x03, 0x03, 0x70, 0x00, 0xff, 0x00, 0x00,
  44         0x00, 0x00, 0x03, 0x03, 0x00, 0x01,
  45 };
  46
  47 static const unsigned char seq_rgb_if[] = {
  48         0xb3, 0x09,
  49 };
  50
  51 static const unsigned char seq_display_inv[] = {
  52         0xb4, 0x01, 0x08, 0x77, 0x0e, 0x06,
  53 };
  54
  55 static const unsigned char seq_vcom[] = {
  56         0xb6, 0x4c, 0x2e,
  57 };
  58
  59 static const unsigned char seq_gate[] = {
  60         0xd5, 0x00, 0x05, 0x03, 0x29, 0x01, 0x07, 0x17, 0x68, 0x13,
  61         0x37, 0x20, 0x31, 0x8a, 0x46, 0x9b, 0x57, 0x13, 0x02, 0x75,
  62         0xb9, 0x64, 0xa8, 0x07, 0x0f, 0x04, 0x07,
  63 };
  64
  65 static const unsigned char seq_panel[] = {
  66         0xcc, 0x02,
  67 };
  68
  69 static const unsigned char seq_col_mod[] = {
  70         0x3a, 0x77,
  71 };
  72
  73 static const unsigned char seq_w_gamma[] = {
  74         0xe0, 0x00, 0x04, 0x09, 0x0f, 0x1f, 0x3f, 0x1f, 0x2f, 0x0a,
  75         0x0f, 0x10, 0x16, 0x18, 0x16, 0x17, 0x0d, 0x15, 0x00, 0x04,
  76         0x09, 0x0f, 0x38, 0x3f, 0x20, 0x39, 0x0a, 0x0f, 0x10, 0x16,
  77         0x18, 0x16, 0x17, 0x0d, 0x15,
  78 };
  79
  80 static const unsigned char seq_rgb_gamma[] = {
  81         0xc1, 0x01, 0x03, 0x07, 0x0f, 0x1a, 0x22, 0x2c, 0x33, 0x3c,
  82         0x46, 0x4f, 0x58, 0x60, 0x69, 0x71, 0x79, 0x82, 0x89, 0x92,
  83         0x9a, 0xa1, 0xa9, 0xb1, 0xb9, 0xc1, 0xc9, 0xcf, 0xd6, 0xde,
  84         0xe5, 0xec, 0xf3, 0xf9, 0xff, 0xdd, 0x39, 0x07, 0x1c, 0xcb,
  85         0xab, 0x5f, 0x49, 0x80, 0x03, 0x07, 0x0f, 0x19, 0x20, 0x2a,
  86         0x31, 0x39, 0x42, 0x4b, 0x53, 0x5b, 0x63, 0x6b, 0x73, 0x7b,
  87         0x83, 0x8a, 0x92, 0x9b, 0xa2, 0xaa, 0xb2, 0xba, 0xc2, 0xca,
  88         0xd0, 0xd8, 0xe1, 0xe8, 0xf0, 0xf8, 0xff, 0xf7, 0xd8, 0xbe,
  89         0xa7, 0x39, 0x40, 0x85, 0x8c, 0xc0, 0x04, 0x07, 0x0c, 0x17,
  90         0x1c, 0x23, 0x2b, 0x34, 0x3b, 0x43, 0x4c, 0x54, 0x5b, 0x63,
  91         0x6a, 0x73, 0x7a, 0x82, 0x8a, 0x91, 0x98, 0xa1, 0xa8, 0xb0,
  92         0xb7, 0xc1, 0xc9, 0xcf, 0xd9, 0xe3, 0xea, 0xf4, 0xff, 0x00,
  93         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  94 };
  95
  96 static const unsigned char seq_up_dn[] = {
  97         0x36, 0x10,
  98 };
  99
 100 static const unsigned char seq_sleep_in[] = {
 101         0x10,
 102 };
 103
 104 static const unsigned char seq_sleep_out[] = {
 105         0x11,
 106 };
 107
 108 static const unsigned char seq_display_on[] = {
 109         0x29,
 110 };
 111
 112 static const unsigned char seq_display_off[] = {
 113         0x10,
 114 };
 115
 116 static int lms501kf03_spi_write_byte(struct lms501kf03 *lcd, int addr, int data)
 117 {
 118         u16 buf[1];
 119         struct spi_message msg;
 120
 121         struct spi_transfer xfer = {
 122                 .len            = 2,
 123                 .tx_buf         = buf,
 124         };
 125
 126         buf[0] = (addr << 8) | data;
 127
 128         spi_message_init(&msg);
 129         spi_message_add_tail(&xfer, &msg);
 130
 131         return spi_sync(lcd->spi, &msg);
 132 }
 133
 134 static int lms501kf03_spi_write(struct lms501kf03 *lcd, unsigned char address,
 135                                 unsigned char command)
 136 {
 137         return lms501kf03_spi_write_byte(lcd, address, command);
 138 }
 139
 140 static int lms501kf03_panel_send_sequence(struct lms501kf03 *lcd,
 141                                         const unsigned char *wbuf,
 142                                         unsigned int len)
 143 {
 144         int ret = 0, i = 0;
 145
 146         while (i < len) {
 147                 if (i == 0)
 148                         ret = lms501kf03_spi_write(lcd, COMMAND_ONLY, wbuf[i]);
 149                 else
 150                         ret = lms501kf03_spi_write(lcd, DATA_ONLY, wbuf[i]);
 151                 if (ret)
 152                         break;
 153                 i += 1;
 154         }
 155
 156         return ret;
 157 }
 158
 159 static int lms501kf03_ldi_init(struct lms501kf03 *lcd)
 160 {
 161         int ret, i;
 162         static const unsigned char *init_seq[] = {
 163                 seq_password,
 164                 seq_power,
 165                 seq_display,
 166                 seq_rgb_if,
 167                 seq_display_inv,
 168                 seq_vcom,
 169                 seq_gate,
 170                 seq_panel,
 171                 seq_col_mod,
 172                 seq_w_gamma,
 173                 seq_rgb_gamma,
 174                 seq_sleep_out,
 175         };
 176
 177         static const unsigned int size_seq[] = {
 178                 ARRAY_SIZE(seq_password),
 179                 ARRAY_SIZE(seq_power),
 180                 ARRAY_SIZE(seq_display),
 181                 ARRAY_SIZE(seq_rgb_if),
 182                 ARRAY_SIZE(seq_display_inv),
 183                 ARRAY_SIZE(seq_vcom),
 184                 ARRAY_SIZE(seq_gate),
 185                 ARRAY_SIZE(seq_panel),
 186                 ARRAY_SIZE(seq_col_mod),
 187                 ARRAY_SIZE(seq_w_gamma),
 188                 ARRAY_SIZE(seq_rgb_gamma),
 189                 ARRAY_SIZE(seq_sleep_out),
 190         };
 191
 192         for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
 193                 ret = lms501kf03_panel_send_sequence(lcd, init_seq[i],
 194                                                 size_seq[i]);
 195                 if (ret)
 196                         break;
 197         }
 198         /*
 199          * According to the datasheet, 120ms delay time is required.
 200          * After sleep out sequence, command is blocked for 120ms.
 201          * Thus, LDI should wait for 120ms.
 202          */
 203         msleep(120);
 204
 205         return ret;
 206 }
 207
 208 static int lms501kf03_ldi_enable(struct lms501kf03 *lcd)
 209 {
 210         return lms501kf03_panel_send_sequence(lcd, seq_display_on,
 211                                         ARRAY_SIZE(seq_display_on));
 212 }
 213
 214 static int lms501kf03_ldi_disable(struct lms501kf03 *lcd)
 215 {
 216         return lms501kf03_panel_send_sequence(lcd, seq_display_off,
 217                                         ARRAY_SIZE(seq_display_off));
 218 }
 219
 220 static int lms501kf03_power_is_on(int power)
 221 {
 222         return (power) <= FB_BLANK_NORMAL;
 223 }
 224
 225 static int lms501kf03_power_on(struct lms501kf03 *lcd)
 226 {
 227         int ret = 0;
 228         struct lcd_platform_data *pd;
 229
 230         pd = lcd->lcd_pd;
 231
 232         if (!pd->power_on) {
 233                 dev_err(lcd->dev, "power_on is NULL.\n");
 234                 return -EINVAL;
 235         }
 236
 237         pd->power_on(lcd->ld, 1);
 238         msleep(pd->power_on_delay);
 239
 240         if (!pd->reset) {
 241                 dev_err(lcd->dev, "reset is NULL.\n");
 242                 return -EINVAL;
 243         }
 244
 245         pd->reset(lcd->ld);
 246         msleep(pd->reset_delay);
 247
 248         ret = lms501kf03_ldi_init(lcd);
 249         if (ret) {
 250                 dev_err(lcd->dev, "failed to initialize ldi.\n");
 251                 return ret;
 252         }
 253
 254         ret = lms501kf03_ldi_enable(lcd);
 255         if (ret) {
 256                 dev_err(lcd->dev, "failed to enable ldi.\n");
 257                 return ret;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static int lms501kf03_power_off(struct lms501kf03 *lcd)
 264 {
 265         int ret = 0;
 266         struct lcd_platform_data *pd;
 267
 268         pd = lcd->lcd_pd;
 269
 270         ret = lms501kf03_ldi_disable(lcd);
 271         if (ret) {
 272                 dev_err(lcd->dev, "lcd setting failed.\n");
 273                 return -EIO;
 274         }
 275
 276         msleep(pd->power_off_delay);
 277
 278         pd->power_on(lcd->ld, 0);
 279
 280         return 0;
 281 }
 282
 283 static int lms501kf03_power(struct lms501kf03 *lcd, int power)
 284 {
 285         int ret = 0;
 286
 287         if (lms501kf03_power_is_on(power) &&
 288                 !lms501kf03_power_is_on(lcd->power))
 289                 ret = lms501kf03_power_on(lcd);
 290         else if (!lms501kf03_power_is_on(power) &&
 291                 lms501kf03_power_is_on(lcd->power))
 292                 ret = lms501kf03_power_off(lcd);
 293
 294         if (!ret)
 295                 lcd->power = power;
 296
 297         return ret;
 298 }
 299
 300 static int lms501kf03_get_power(struct lcd_device *ld)
 301 {
 302         struct lms501kf03 *lcd = lcd_get_data(ld);
 303
 304         return lcd->power;
 305 }
 306
 307 static int lms501kf03_set_power(struct lcd_device *ld, int power)
 308 {
 309         struct lms501kf03 *lcd = lcd_get_data(ld);
 310
 311         if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
 312                 power != FB_BLANK_NORMAL) {
 313                 dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
 314                 return -EINVAL;
 315         }
 316
 317         return lms501kf03_power(lcd, power);
 318 }
 319
 320 static struct lcd_ops lms501kf03_lcd_ops = {
 321         .get_power = lms501kf03_get_power,
 322         .set_power = lms501kf03_set_power,
 323 };
 324
 325 static int lms501kf03_probe(struct spi_device *spi)
 326 {
 327         struct lms501kf03 *lcd = NULL;
 328         struct lcd_device *ld = NULL;
 329         int ret = 0;
 330
 331         lcd = devm_kzalloc(&spi->dev, sizeof(struct lms501kf03), GFP_KERNEL);
 332         if (!lcd)
 333                 return -ENOMEM;
 334
 335         /* lms501kf03 lcd panel uses 3-wire 9-bit SPI Mode. */
 336         spi->bits_per_word = 9;
 337
 338         ret = spi_setup(spi);
 339         if (ret < 0) {
 340                 dev_err(&spi->dev, "spi setup failed.\n");
 341                 return ret;
 342         }
 343
 344         lcd->spi = spi;
 345         lcd->dev = &spi->dev;
 346
 347         lcd->lcd_pd = dev_get_platdata(&spi->dev);
 348         if (!lcd->lcd_pd) {
 349                 dev_err(&spi->dev, "platform data is NULL\n");
 350                 return -EINVAL;
 351         }
 352
 353         ld = devm_lcd_device_register(&spi->dev, "lms501kf03", &spi->dev, lcd,
 354                                         &lms501kf03_lcd_ops);
 355         if (IS_ERR(ld))
 356                 return PTR_ERR(ld);
 357
 358         lcd->ld = ld;
 359
 360         if (!lcd->lcd_pd->lcd_enabled) {
 361                 /*
 362                  * if lcd panel was off from bootloader then
 363                  * current lcd status is powerdown and then
 364                  * it enables lcd panel.
 365                  */
 366                 lcd->power = FB_BLANK_POWERDOWN;
 367
 368                 lms501kf03_power(lcd, FB_BLANK_UNBLANK);
 369         } else {
 370                 lcd->power = FB_BLANK_UNBLANK;
 371         }
 372
 373         spi_set_drvdata(spi, lcd);
 374
 375         dev_info(&spi->dev, "lms501kf03 panel driver has been probed.\n");
 376
 377         return 0;
 378 }
 379
 380 static int lms501kf03_remove(struct spi_device *spi)
 381 {
 382         struct lms501kf03 *lcd = spi_get_drvdata(spi);
 383
 384         lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
 385         return 0;
 386 }
 387
 388 #ifdef CONFIG_PM_SLEEP
 389 static int lms501kf03_suspend(struct device *dev)
 390 {
 391         struct lms501kf03 *lcd = dev_get_drvdata(dev);
 392
 393         dev_dbg(dev, "lcd->power = %d\n", lcd->power);
 394
 395         /*
 396          * when lcd panel is suspend, lcd panel becomes off
 397          * regardless of status.
 398          */
 399         return lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
 400 }
 401
 402 static int lms501kf03_resume(struct device *dev)
 403 {
 404         struct lms501kf03 *lcd = dev_get_drvdata(dev);
 405
 406         lcd->power = FB_BLANK_POWERDOWN;
 407
 408         return lms501kf03_power(lcd, FB_BLANK_UNBLANK);
 409 }
 410 #endif
 411
 412 static SIMPLE_DEV_PM_OPS(lms501kf03_pm_ops, lms501kf03_suspend,
 413                         lms501kf03_resume);
 414
 415 static void lms501kf03_shutdown(struct spi_device *spi)
 416 {
 417         struct lms501kf03 *lcd = spi_get_drvdata(spi);
 418
 419         lms501kf03_power(lcd, FB_BLANK_POWERDOWN);
 420 }
 421
 422 static struct spi_driver lms501kf03_driver = {
 423         .driver = {
 424                 .name   = "lms501kf03",
 425                 .pm     = &lms501kf03_pm_ops,
 426         },
 427         .probe          = lms501kf03_probe,
 428         .remove         = lms501kf03_remove,
 429         .shutdown       = lms501kf03_shutdown,
 430 };
 431
 432 module_spi_driver(lms501kf03_driver);
 433
 434 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 435 MODULE_DESCRIPTION("lms501kf03 LCD Driver");
 436 MODULE_LICENSE("GPL");