drivers/video/backlight/tdo24m.c

   1 /*
   2  * tdo24m - SPI-based drivers for Toppoly TDO24M series LCD panels
   3  *
   4  * Copyright (C) 2008 Marvell International Ltd.
   5  *      Eric Miao <eric.miao@marvell.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  publishhed by the Free Software Foundation.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/device.h>
  16 #include <linux/spi/spi.h>
  17 #include <linux/spi/tdo24m.h>
  18 #include <linux/fb.h>
  19 #include <linux/lcd.h>
  20 #include <linux/slab.h>
  21
  22 #define POWER_IS_ON(pwr)        ((pwr) <= FB_BLANK_NORMAL)
  23
  24 #define TDO24M_SPI_BUFF_SIZE    (4)
  25 #define MODE_QVGA       0
  26 #define MODE_VGA        1
  27
  28 struct tdo24m {
  29         struct spi_device       *spi_dev;
  30         struct lcd_device       *lcd_dev;
  31
  32         struct spi_message      msg;
  33         struct spi_transfer     xfer;
  34         uint8_t                 *buf;
  35
  36         int (*adj_mode)(struct tdo24m *lcd, int mode);
  37         int color_invert;
  38
  39         int                     power;
  40         int                     mode;
  41 };
  42
  43 /* use bit 30, 31 as the indicator of command parameter number */
  44 #define CMD0(x)         ((0 << 30) | (x))
  45 #define CMD1(x, x1)     ((1 << 30) | ((x) << 9) | 0x100 | (x1))
  46 #define CMD2(x, x1, x2) ((2 << 30) | ((x) << 18) | 0x20000 |\
  47                         ((x1) << 9) | 0x100 | (x2))
  48 #define CMD_NULL        (-1)
  49
  50 static const uint32_t lcd_panel_reset[] = {
  51         CMD0(0x1), /* reset */
  52         CMD0(0x0), /* nop */
  53         CMD0(0x0), /* nop */
  54         CMD0(0x0), /* nop */
  55         CMD_NULL,
  56 };
  57
  58 static const uint32_t lcd_panel_on[] = {
  59         CMD0(0x29),             /* Display ON */
  60         CMD2(0xB8, 0xFF, 0xF9), /* Output Control */
  61         CMD0(0x11),             /* Sleep out */
  62         CMD1(0xB0, 0x16),       /* Wake */
  63         CMD_NULL,
  64 };
  65
  66 static const uint32_t lcd_panel_off[] = {
  67         CMD0(0x28),             /* Display OFF */
  68         CMD2(0xB8, 0x80, 0x02), /* Output Control */
  69         CMD0(0x10),             /* Sleep in */
  70         CMD1(0xB0, 0x00),       /* Deep stand by in */
  71         CMD_NULL,
  72 };
  73
  74 static const uint32_t lcd_vga_pass_through_tdo24m[] = {
  75         CMD1(0xB0, 0x16),
  76         CMD1(0xBC, 0x80),
  77         CMD1(0xE1, 0x00),
  78         CMD1(0x36, 0x50),
  79         CMD1(0x3B, 0x00),
  80         CMD_NULL,
  81 };
  82
  83 static const uint32_t lcd_qvga_pass_through_tdo24m[] = {
  84         CMD1(0xB0, 0x16),
  85         CMD1(0xBC, 0x81),
  86         CMD1(0xE1, 0x00),
  87         CMD1(0x36, 0x50),
  88         CMD1(0x3B, 0x22),
  89         CMD_NULL,
  90 };
  91
  92 static const uint32_t lcd_vga_transfer_tdo24m[] = {
  93         CMD1(0xcf, 0x02),       /* Blanking period control (1) */
  94         CMD2(0xd0, 0x08, 0x04), /* Blanking period control (2) */
  95         CMD1(0xd1, 0x01),       /* CKV timing control on/off */
  96         CMD2(0xd2, 0x14, 0x00), /* CKV 1,2 timing control */
  97         CMD2(0xd3, 0x1a, 0x0f), /* OEV timing control */
  98         CMD2(0xd4, 0x1f, 0xaf), /* ASW timing control (1) */
  99         CMD1(0xd5, 0x14),       /* ASW timing control (2) */
 100         CMD0(0x21),             /* Invert for normally black display */
 101         CMD0(0x29),             /* Display on */
 102         CMD_NULL,
 103 };
 104
 105 static const uint32_t lcd_qvga_transfer[] = {
 106         CMD1(0xd6, 0x02),       /* Blanking period control (1) */
 107         CMD2(0xd7, 0x08, 0x04), /* Blanking period control (2) */
 108         CMD1(0xd8, 0x01),       /* CKV timing control on/off */
 109         CMD2(0xd9, 0x00, 0x08), /* CKV 1,2 timing control */
 110         CMD2(0xde, 0x05, 0x0a), /* OEV timing control */
 111         CMD2(0xdf, 0x0a, 0x19), /* ASW timing control (1) */
 112         CMD1(0xe0, 0x0a),       /* ASW timing control (2) */
 113         CMD0(0x21),             /* Invert for normally black display */
 114         CMD0(0x29),             /* Display on */
 115         CMD_NULL,
 116 };
 117
 118 static const uint32_t lcd_vga_pass_through_tdo35s[] = {
 119         CMD1(0xB0, 0x16),
 120         CMD1(0xBC, 0x80),
 121         CMD1(0xE1, 0x00),
 122         CMD1(0x3B, 0x00),
 123         CMD_NULL,
 124 };
 125
 126 static const uint32_t lcd_qvga_pass_through_tdo35s[] = {
 127         CMD1(0xB0, 0x16),
 128         CMD1(0xBC, 0x81),
 129         CMD1(0xE1, 0x00),
 130         CMD1(0x3B, 0x22),
 131         CMD_NULL,
 132 };
 133
 134 static const uint32_t lcd_vga_transfer_tdo35s[] = {
 135         CMD1(0xcf, 0x02),       /* Blanking period control (1) */
 136         CMD2(0xd0, 0x08, 0x04), /* Blanking period control (2) */
 137         CMD1(0xd1, 0x01),       /* CKV timing control on/off */
 138         CMD2(0xd2, 0x00, 0x1e), /* CKV 1,2 timing control */
 139         CMD2(0xd3, 0x14, 0x28), /* OEV timing control */
 140         CMD2(0xd4, 0x28, 0x64), /* ASW timing control (1) */
 141         CMD1(0xd5, 0x28),       /* ASW timing control (2) */
 142         CMD0(0x21),             /* Invert for normally black display */
 143         CMD0(0x29),             /* Display on */
 144         CMD_NULL,
 145 };
 146
 147 static const uint32_t lcd_panel_config[] = {
 148         CMD2(0xb8, 0xff, 0xf9), /* Output control */
 149         CMD0(0x11),             /* sleep out */
 150         CMD1(0xba, 0x01),       /* Display mode (1) */
 151         CMD1(0xbb, 0x00),       /* Display mode (2) */
 152         CMD1(0x3a, 0x60),       /* Display mode 18-bit RGB */
 153         CMD1(0xbf, 0x10),       /* Drive system change control */
 154         CMD1(0xb1, 0x56),       /* Booster operation setup */
 155         CMD1(0xb2, 0x33),       /* Booster mode setup */
 156         CMD1(0xb3, 0x11),       /* Booster frequency setup */
 157         CMD1(0xb4, 0x02),       /* Op amp/system clock */
 158         CMD1(0xb5, 0x35),       /* VCS voltage */
 159         CMD1(0xb6, 0x40),       /* VCOM voltage */
 160         CMD1(0xb7, 0x03),       /* External display signal */
 161         CMD1(0xbd, 0x00),       /* ASW slew rate */
 162         CMD1(0xbe, 0x00),       /* Dummy data for QuadData operation */
 163         CMD1(0xc0, 0x11),       /* Sleep out FR count (A) */
 164         CMD1(0xc1, 0x11),       /* Sleep out FR count (B) */
 165         CMD1(0xc2, 0x11),       /* Sleep out FR count (C) */
 166         CMD2(0xc3, 0x20, 0x40), /* Sleep out FR count (D) */
 167         CMD2(0xc4, 0x60, 0xc0), /* Sleep out FR count (E) */
 168         CMD2(0xc5, 0x10, 0x20), /* Sleep out FR count (F) */
 169         CMD1(0xc6, 0xc0),       /* Sleep out FR count (G) */
 170         CMD2(0xc7, 0x33, 0x43), /* Gamma 1 fine tuning (1) */
 171         CMD1(0xc8, 0x44),       /* Gamma 1 fine tuning (2) */
 172         CMD1(0xc9, 0x33),       /* Gamma 1 inclination adjustment */
 173         CMD1(0xca, 0x00),       /* Gamma 1 blue offset adjustment */
 174         CMD2(0xec, 0x01, 0xf0), /* Horizontal clock cycles */
 175         CMD_NULL,
 176 };
 177
 178 static int tdo24m_writes(struct tdo24m *lcd, const uint32_t *array)
 179 {
 180         struct spi_transfer *x = &lcd->xfer;
 181         const uint32_t *p = array;
 182         uint32_t data;
 183         int nparams, err = 0;
 184
 185         for (; *p != CMD_NULL; p++) {
 186                 if (!lcd->color_invert && *p == CMD0(0x21))
 187                         continue;
 188
 189                 nparams = (*p >> 30) & 0x3;
 190
 191                 data = *p << (7 - nparams);
 192                 switch (nparams) {
 193                 case 0:
 194                         lcd->buf[0] = (data >> 8) & 0xff;
 195                         lcd->buf[1] = data & 0xff;
 196                         break;
 197                 case 1:
 198                         lcd->buf[0] = (data >> 16) & 0xff;
 199                         lcd->buf[1] = (data >> 8) & 0xff;
 200                         lcd->buf[2] = data & 0xff;
 201                         break;
 202                 case 2:
 203                         lcd->buf[0] = (data >> 24) & 0xff;
 204                         lcd->buf[1] = (data >> 16) & 0xff;
 205                         lcd->buf[2] = (data >> 8) & 0xff;
 206                         lcd->buf[3] = data & 0xff;
 207                         break;
 208                 default:
 209                         continue;
 210                 }
 211                 x->len = nparams + 2;
 212                 err = spi_sync(lcd->spi_dev, &lcd->msg);
 213                 if (err)
 214                         break;
 215         }
 216
 217         return err;
 218 }
 219
 220 static int tdo24m_adj_mode(struct tdo24m *lcd, int mode)
 221 {
 222         switch (mode) {
 223         case MODE_VGA:
 224                 tdo24m_writes(lcd, lcd_vga_pass_through_tdo24m);
 225                 tdo24m_writes(lcd, lcd_panel_config);
 226                 tdo24m_writes(lcd, lcd_vga_transfer_tdo24m);
 227                 break;
 228         case MODE_QVGA:
 229                 tdo24m_writes(lcd, lcd_qvga_pass_through_tdo24m);
 230                 tdo24m_writes(lcd, lcd_panel_config);
 231                 tdo24m_writes(lcd, lcd_qvga_transfer);
 232                 break;
 233         default:
 234                 return -EINVAL;
 235         }
 236
 237         lcd->mode = mode;
 238         return 0;
 239 }
 240
 241 static int tdo35s_adj_mode(struct tdo24m *lcd, int mode)
 242 {
 243         switch (mode) {
 244         case MODE_VGA:
 245                 tdo24m_writes(lcd, lcd_vga_pass_through_tdo35s);
 246                 tdo24m_writes(lcd, lcd_panel_config);
 247                 tdo24m_writes(lcd, lcd_vga_transfer_tdo35s);
 248                 break;
 249         case MODE_QVGA:
 250                 tdo24m_writes(lcd, lcd_qvga_pass_through_tdo35s);
 251                 tdo24m_writes(lcd, lcd_panel_config);
 252                 tdo24m_writes(lcd, lcd_qvga_transfer);
 253                 break;
 254         default:
 255                 return -EINVAL;
 256         }
 257
 258         lcd->mode = mode;
 259         return 0;
 260 }
 261
 262 static int tdo24m_power_on(struct tdo24m *lcd)
 263 {
 264         int err;
 265
 266         err = tdo24m_writes(lcd, lcd_panel_on);
 267         if (err)
 268                 goto out;
 269
 270         err = tdo24m_writes(lcd, lcd_panel_reset);
 271         if (err)
 272                 goto out;
 273
 274         err = lcd->adj_mode(lcd, lcd->mode);
 275 out:
 276         return err;
 277 }
 278
 279 static int tdo24m_power_off(struct tdo24m *lcd)
 280 {
 281         return tdo24m_writes(lcd, lcd_panel_off);
 282 }
 283
 284 static int tdo24m_power(struct tdo24m *lcd, int power)
 285 {
 286         int ret = 0;
 287
 288         if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
 289                 ret = tdo24m_power_on(lcd);
 290         else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
 291                 ret = tdo24m_power_off(lcd);
 292
 293         if (!ret)
 294                 lcd->power = power;
 295
 296         return ret;
 297 }
 298
 299
 300 static int tdo24m_set_power(struct lcd_device *ld, int power)
 301 {
 302         struct tdo24m *lcd = lcd_get_data(ld);
 303         return tdo24m_power(lcd, power);
 304 }
 305
 306 static int tdo24m_get_power(struct lcd_device *ld)
 307 {
 308         struct tdo24m *lcd = lcd_get_data(ld);
 309         return lcd->power;
 310 }
 311
 312 static int tdo24m_set_mode(struct lcd_device *ld, struct fb_videomode *m)
 313 {
 314         struct tdo24m *lcd = lcd_get_data(ld);
 315         int mode = MODE_QVGA;
 316
 317         if (m->xres == 640 || m->xres == 480)
 318                 mode = MODE_VGA;
 319
 320         if (lcd->mode == mode)
 321                 return 0;
 322
 323         return lcd->adj_mode(lcd, mode);
 324 }
 325
 326 static struct lcd_ops tdo24m_ops = {
 327         .get_power      = tdo24m_get_power,
 328         .set_power      = tdo24m_set_power,
 329         .set_mode       = tdo24m_set_mode,
 330 };
 331
 332 static int tdo24m_probe(struct spi_device *spi)
 333 {
 334         struct tdo24m *lcd;
 335         struct spi_message *m;
 336         struct spi_transfer *x;
 337         struct tdo24m_platform_data *pdata;
 338         enum tdo24m_model model;
 339         int err;
 340
 341         pdata = spi->dev.platform_data;
 342         if (pdata)
 343                 model = pdata->model;
 344         else
 345                 model = TDO24M;
 346
 347         spi->bits_per_word = 8;
 348         spi->mode = SPI_MODE_3;
 349         err = spi_setup(spi);
 350         if (err)
 351                 return err;
 352
 353         lcd = devm_kzalloc(&spi->dev, sizeof(struct tdo24m), GFP_KERNEL);
 354         if (!lcd)
 355                 return -ENOMEM;
 356
 357         lcd->spi_dev = spi;
 358         lcd->power = FB_BLANK_POWERDOWN;
 359         lcd->mode = MODE_VGA;   /* default to VGA */
 360
 361         lcd->buf = devm_kzalloc(&spi->dev, TDO24M_SPI_BUFF_SIZE, GFP_KERNEL);
 362         if (lcd->buf == NULL)
 363                 return -ENOMEM;
 364
 365         m = &lcd->msg;
 366         x = &lcd->xfer;
 367
 368         spi_message_init(m);
 369
 370         x->cs_change = 1;
 371         x->tx_buf = &lcd->buf[0];
 372         spi_message_add_tail(x, m);
 373
 374         switch (model) {
 375         case TDO24M:
 376                 lcd->color_invert = 1;
 377                 lcd->adj_mode = tdo24m_adj_mode;
 378                 break;
 379         case TDO35S:
 380                 lcd->adj_mode = tdo35s_adj_mode;
 381                 lcd->color_invert = 0;
 382                 break;
 383         default:
 384                 dev_err(&spi->dev, "Unsupported model");
 385                 return -EINVAL;
 386         }
 387
 388         lcd->lcd_dev = lcd_device_register("tdo24m", &spi->dev,
 389                                         lcd, &tdo24m_ops);
 390         if (IS_ERR(lcd->lcd_dev))
 391                 return PTR_ERR(lcd->lcd_dev);
 392
 393         dev_set_drvdata(&spi->dev, lcd);
 394         err = tdo24m_power(lcd, FB_BLANK_UNBLANK);
 395         if (err)
 396                 goto out_unregister;
 397
 398         return 0;
 399
 400 out_unregister:
 401         lcd_device_unregister(lcd->lcd_dev);
 402         return err;
 403 }
 404
 405 static int tdo24m_remove(struct spi_device *spi)
 406 {
 407         struct tdo24m *lcd = dev_get_drvdata(&spi->dev);
 408
 409         tdo24m_power(lcd, FB_BLANK_POWERDOWN);
 410         lcd_device_unregister(lcd->lcd_dev);
 411
 412         return 0;
 413 }
 414
 415 #ifdef CONFIG_PM
 416 static int tdo24m_suspend(struct spi_device *spi, pm_message_t state)
 417 {
 418         struct tdo24m *lcd = dev_get_drvdata(&spi->dev);
 419
 420         return tdo24m_power(lcd, FB_BLANK_POWERDOWN);
 421 }
 422
 423 static int tdo24m_resume(struct spi_device *spi)
 424 {
 425         struct tdo24m *lcd = dev_get_drvdata(&spi->dev);
 426
 427         return tdo24m_power(lcd, FB_BLANK_UNBLANK);
 428 }
 429 #else
 430 #define tdo24m_suspend  NULL
 431 #define tdo24m_resume   NULL
 432 #endif
 433
 434 /* Power down all displays on reboot, poweroff or halt */
 435 static void tdo24m_shutdown(struct spi_device *spi)
 436 {
 437         struct tdo24m *lcd = dev_get_drvdata(&spi->dev);
 438
 439         tdo24m_power(lcd, FB_BLANK_POWERDOWN);
 440 }
 441
 442 static struct spi_driver tdo24m_driver = {
 443         .driver = {
 444                 .name           = "tdo24m",
 445                 .owner          = THIS_MODULE,
 446         },
 447         .probe          = tdo24m_probe,
 448         .remove         = tdo24m_remove,
 449         .shutdown       = tdo24m_shutdown,
 450         .suspend        = tdo24m_suspend,
 451         .resume         = tdo24m_resume,
 452 };
 453
 454 module_spi_driver(tdo24m_driver);
 455
 456 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
 457 MODULE_DESCRIPTION("Driver for Toppoly TDO24M LCD Panel");
 458 MODULE_LICENSE("GPL");
 459 MODULE_ALIAS("spi:tdo24m");