LXR linux/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
  28struct 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
  50static 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
  58static 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
  66static 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
  74static 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
  83static 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
  92static 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
 105static 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
 118static 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
 126static 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
 134static 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
 147static 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
 178static 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
 220static 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
 241static 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
 262static 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);
 275out:
 276        return err;
 277}
 278
 279static int tdo24m_power_off(struct tdo24m *lcd)
 280{
 281        return tdo24m_writes(lcd, lcd_panel_off);
 282}
 283
 284static 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
 300static int tdo24m_set_power(struct lcd_device *ld, int power)
 301{
 302        struct tdo24m *lcd = lcd_get_data(ld);
 303
 304        return tdo24m_power(lcd, power);
 305}
 306
 307static int tdo24m_get_power(struct lcd_device *ld)
 308{
 309        struct tdo24m *lcd = lcd_get_data(ld);
 310
 311        return lcd->power;
 312}
 313
 314static int tdo24m_set_mode(struct lcd_device *ld, struct fb_videomode *m)
 315{
 316        struct tdo24m *lcd = lcd_get_data(ld);
 317        int mode = MODE_QVGA;
 318
 319        if (m->xres == 640 || m->xres == 480)
 320                mode = MODE_VGA;
 321
 322        if (lcd->mode == mode)
 323                return 0;
 324
 325        return lcd->adj_mode(lcd, mode);
 326}
 327
 328static struct lcd_ops tdo24m_ops = {
 329        .get_power      = tdo24m_get_power,
 330        .set_power      = tdo24m_set_power,
 331        .set_mode       = tdo24m_set_mode,
 332};
 333
 334static int tdo24m_probe(struct spi_device *spi)
 335{
 336        struct tdo24m *lcd;
 337        struct spi_message *m;
 338        struct spi_transfer *x;
 339        struct tdo24m_platform_data *pdata;
 340        enum tdo24m_model model;
 341        int err;
 342
 343        pdata = dev_get_platdata(&spi->dev);
 344        if (pdata)
 345                model = pdata->model;
 346        else
 347                model = TDO24M;
 348
 349        spi->bits_per_word = 8;
 350        spi->mode = SPI_MODE_3;
 351        err = spi_setup(spi);
 352        if (err)
 353                return err;
 354
 355        lcd = devm_kzalloc(&spi->dev, sizeof(struct tdo24m), GFP_KERNEL);
 356        if (!lcd)
 357                return -ENOMEM;
 358
 359        lcd->spi_dev = spi;
 360        lcd->power = FB_BLANK_POWERDOWN;
 361        lcd->mode = MODE_VGA;   /* default to VGA */
 362
 363        lcd->buf = devm_kzalloc(&spi->dev, TDO24M_SPI_BUFF_SIZE, GFP_KERNEL);
 364        if (lcd->buf == NULL)
 365                return -ENOMEM;
 366
 367        m = &lcd->msg;
 368        x = &lcd->xfer;
 369
 370        spi_message_init(m);
 371
 372        x->cs_change = 1;
 373        x->tx_buf = &lcd->buf[0];
 374        spi_message_add_tail(x, m);
 375
 376        switch (model) {
 377        case TDO24M:
 378                lcd->color_invert = 1;
 379                lcd->adj_mode = tdo24m_adj_mode;
 380                break;
 381        case TDO35S:
 382                lcd->adj_mode = tdo35s_adj_mode;
 383                lcd->color_invert = 0;
 384                break;
 385        default:
 386                dev_err(&spi->dev, "Unsupported model");
 387                return -EINVAL;
 388        }
 389
 390        lcd->lcd_dev = devm_lcd_device_register(&spi->dev, "tdo24m", &spi->dev,
 391                                                lcd, &tdo24m_ops);
 392        if (IS_ERR(lcd->lcd_dev))
 393                return PTR_ERR(lcd->lcd_dev);
 394
 395        spi_set_drvdata(spi, lcd);
 396        err = tdo24m_power(lcd, FB_BLANK_UNBLANK);
 397        if (err)
 398                return err;
 399
 400        return 0;
 401}
 402
 403static int tdo24m_remove(struct spi_device *spi)
 404{
 405        struct tdo24m *lcd = spi_get_drvdata(spi);
 406
 407        tdo24m_power(lcd, FB_BLANK_POWERDOWN);
 408        return 0;
 409}
 410
 411#ifdef CONFIG_PM_SLEEP
 412static int tdo24m_suspend(struct device *dev)
 413{
 414        struct tdo24m *lcd = dev_get_drvdata(dev);
 415
 416        return tdo24m_power(lcd, FB_BLANK_POWERDOWN);
 417}
 418
 419static int tdo24m_resume(struct device *dev)
 420{
 421        struct tdo24m *lcd = dev_get_drvdata(dev);
 422
 423        return tdo24m_power(lcd, FB_BLANK_UNBLANK);
 424}
 425#endif
 426
 427static SIMPLE_DEV_PM_OPS(tdo24m_pm_ops, tdo24m_suspend, tdo24m_resume);
 428
 429/* Power down all displays on reboot, poweroff or halt */
 430static void tdo24m_shutdown(struct spi_device *spi)
 431{
 432        struct tdo24m *lcd = spi_get_drvdata(spi);
 433
 434        tdo24m_power(lcd, FB_BLANK_POWERDOWN);
 435}
 436
 437static struct spi_driver tdo24m_driver = {
 438        .driver = {
 439                .name           = "tdo24m",
 440                .pm             = &tdo24m_pm_ops,
 441        },
 442        .probe          = tdo24m_probe,
 443        .remove         = tdo24m_remove,
 444        .shutdown       = tdo24m_shutdown,
 445};
 446
 447module_spi_driver(tdo24m_driver);
 448
 449MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
 450MODULE_DESCRIPTION("Driver for Toppoly TDO24M LCD Panel");
 451MODULE_LICENSE("GPL");
 452MODULE_ALIAS("spi:tdo24m");
 453