release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/video/omap2/displays/panel-tpo-td043mtea1.c

   1 /*
   2  * LCD panel driver for TPO TD043MTEA1
   3  *
   4  * Author: Gražvydas Ignotas <notasas@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/delay.h>
  14 #include <linux/spi/spi.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/gpio.h>
  17 #include <linux/err.h>
  18 #include <linux/slab.h>
  19
  20 #include <plat/display.h>
  21
  22 #define TPO_R02_MODE(x)         ((x) & 7)
  23 #define TPO_R02_MODE_800x480    7
  24 #define TPO_R02_NCLK_RISING     BIT(3)
  25 #define TPO_R02_HSYNC_HIGH      BIT(4)
  26 #define TPO_R02_VSYNC_HIGH      BIT(5)
  27
  28 #define TPO_R03_NSTANDBY        BIT(0)
  29 #define TPO_R03_EN_CP_CLK       BIT(1)
  30 #define TPO_R03_EN_VGL_PUMP     BIT(2)
  31 #define TPO_R03_EN_PWM          BIT(3)
  32 #define TPO_R03_DRIVING_CAP_100 BIT(4)
  33 #define TPO_R03_EN_PRE_CHARGE   BIT(6)
  34 #define TPO_R03_SOFTWARE_CTL    BIT(7)
  35
  36 #define TPO_R04_NFLIP_H         BIT(0)
  37 #define TPO_R04_NFLIP_V         BIT(1)
  38 #define TPO_R04_CP_CLK_FREQ_1H  BIT(2)
  39 #define TPO_R04_VGL_FREQ_1H     BIT(4)
  40
  41 #define TPO_R03_VAL_NORMAL (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | \
  42                         TPO_R03_EN_VGL_PUMP |  TPO_R03_EN_PWM | \
  43                         TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
  44                         TPO_R03_SOFTWARE_CTL)
  45
  46 #define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
  47                         TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
  48
  49 static const u16 tpo_td043_def_gamma[12] = {
  50         106, 200, 289, 375, 460, 543, 625, 705, 785, 864, 942, 1020
  51 };
  52
  53 struct tpo_td043_device {
  54         struct spi_device *spi;
  55         struct regulator *vcc_reg;
  56         u16 gamma[12];
  57         u32 mode;
  58         u32 hmirror:1;
  59         u32 vmirror:1;
  60 };
  61
  62 static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
  63 {
  64         struct spi_message      m;
  65         struct spi_transfer     xfer;
  66         u16                     w;
  67         int                     r;
  68
  69         spi_message_init(&m);
  70
  71         memset(&xfer, 0, sizeof(xfer));
  72
  73         w = ((u16)addr << 10) | (1 << 8) | data;
  74         xfer.tx_buf = &w;
  75         xfer.bits_per_word = 16;
  76         xfer.len = 2;
  77         spi_message_add_tail(&xfer, &m);
  78
  79         r = spi_sync(spi, &m);
  80         if (r < 0)
  81                 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
  82         return r;
  83 }
  84
  85 static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
  86 {
  87         u8 i, val;
  88
  89         /* gamma bits [9:8] */
  90         for (val = i = 0; i < 4; i++)
  91                 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
  92         tpo_td043_write(spi, 0x11, val);
  93
  94         for (val = i = 0; i < 4; i++)
  95                 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
  96         tpo_td043_write(spi, 0x12, val);
  97
  98         for (val = i = 0; i < 4; i++)
  99                 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
 100         tpo_td043_write(spi, 0x13, val);
 101
 102         /* gamma bits [7:0] */
 103         for (val = i = 0; i < 12; i++)
 104                 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
 105 }
 106
 107 static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
 108 {
 109         u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V | \
 110                 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
 111         if (h)
 112                 reg4 &= ~TPO_R04_NFLIP_H;
 113         if (v)
 114                 reg4 &= ~TPO_R04_NFLIP_V;
 115
 116         return tpo_td043_write(spi, 4, reg4);
 117 }
 118
 119 static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
 120 {
 121         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 122
 123         tpo_td043->hmirror = enable;
 124         return tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
 125                         tpo_td043->vmirror);
 126 }
 127
 128 static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
 129 {
 130         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 131
 132         return tpo_td043->hmirror;
 133 }
 134
 135 static ssize_t tpo_td043_vmirror_show(struct device *dev,
 136         struct device_attribute *attr, char *buf)
 137 {
 138         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 139
 140         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->vmirror);
 141 }
 142
 143 static ssize_t tpo_td043_vmirror_store(struct device *dev,
 144         struct device_attribute *attr, const char *buf, size_t count)
 145 {
 146         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 147         long val;
 148         int ret;
 149
 150         ret = strict_strtol(buf, 0, &val);
 151         if (ret < 0)
 152                 return ret;
 153
 154         ret = tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, val);
 155         if (ret < 0)
 156                 return ret;
 157
 158         tpo_td043->vmirror = val;
 159
 160         return count;
 161 }
 162
 163 static ssize_t tpo_td043_mode_show(struct device *dev,
 164         struct device_attribute *attr, char *buf)
 165 {
 166         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 167
 168         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->mode);
 169 }
 170
 171 static ssize_t tpo_td043_mode_store(struct device *dev,
 172         struct device_attribute *attr, const char *buf, size_t count)
 173 {
 174         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 175         long val;
 176         int ret;
 177
 178         ret = strict_strtol(buf, 0, &val);
 179         if (ret != 0 || val & ~7)
 180                 return -EINVAL;
 181
 182         tpo_td043->mode = val;
 183
 184         val |= TPO_R02_NCLK_RISING;
 185         tpo_td043_write(tpo_td043->spi, 2, val);
 186
 187         return count;
 188 }
 189
 190 static ssize_t tpo_td043_gamma_show(struct device *dev,
 191         struct device_attribute *attr, char *buf)
 192 {
 193         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 194         ssize_t len = 0;
 195         int ret;
 196         int i;
 197
 198         for (i = 0; i < ARRAY_SIZE(tpo_td043->gamma); i++) {
 199                 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
 200                                 tpo_td043->gamma[i]);
 201                 if (ret < 0)
 202                         return ret;
 203                 len += ret;
 204         }
 205         buf[len - 1] = '\n';
 206
 207         return len;
 208 }
 209
 210 static ssize_t tpo_td043_gamma_store(struct device *dev,
 211         struct device_attribute *attr, const char *buf, size_t count)
 212 {
 213         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 214         unsigned int g[12];
 215         int ret;
 216         int i;
 217
 218         ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
 219                         &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
 220                         &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
 221
 222         if (ret != 12)
 223                 return -EINVAL;
 224
 225         for (i = 0; i < 12; i++)
 226                 tpo_td043->gamma[i] = g[i];
 227
 228         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
 229
 230         return count;
 231 }
 232
 233 static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
 234                 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
 235 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 236                 tpo_td043_mode_show, tpo_td043_mode_store);
 237 static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
 238                 tpo_td043_gamma_show, tpo_td043_gamma_store);
 239
 240 static struct attribute *tpo_td043_attrs[] = {
 241         &dev_attr_vmirror.attr,
 242         &dev_attr_mode.attr,
 243         &dev_attr_gamma.attr,
 244         NULL,
 245 };
 246
 247 static struct attribute_group tpo_td043_attr_group = {
 248         .attrs = tpo_td043_attrs,
 249 };
 250
 251 static const struct omap_video_timings tpo_td043_timings = {
 252         .x_res          = 800,
 253         .y_res          = 480,
 254
 255         .pixel_clock    = 36000,
 256
 257         .hsw            = 1,
 258         .hfp            = 68,
 259         .hbp            = 214,
 260
 261         .vsw            = 1,
 262         .vfp            = 39,
 263         .vbp            = 34,
 264 };
 265
 266 static int tpo_td043_power_on(struct omap_dss_device *dssdev)
 267 {
 268         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 269         int nreset_gpio = dssdev->reset_gpio;
 270         int r;
 271
 272         r = omapdss_dpi_display_enable(dssdev);
 273         if (r)
 274                 goto err0;
 275
 276         if (dssdev->platform_enable) {
 277                 r = dssdev->platform_enable(dssdev);
 278                 if (r)
 279                         goto err1;
 280         }
 281
 282         regulator_enable(tpo_td043->vcc_reg);
 283
 284         /* wait for power up */
 285         msleep(160);
 286
 287         if (gpio_is_valid(nreset_gpio))
 288                 gpio_set_value(nreset_gpio, 1);
 289
 290         tpo_td043_write(tpo_td043->spi, 2,
 291                         TPO_R02_MODE(tpo_td043->mode) | TPO_R02_NCLK_RISING);
 292         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_NORMAL);
 293         tpo_td043_write(tpo_td043->spi, 0x20, 0xf0);
 294         tpo_td043_write(tpo_td043->spi, 0x21, 0xf0);
 295         tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
 296                         tpo_td043->vmirror);
 297         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
 298
 299         return 0;
 300 err1:
 301         omapdss_dpi_display_disable(dssdev);
 302 err0:
 303         return r;
 304 }
 305
 306 static void tpo_td043_power_off(struct omap_dss_device *dssdev)
 307 {
 308         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 309         int nreset_gpio = dssdev->reset_gpio;
 310
 311         tpo_td043_write(tpo_td043->spi, 3,
 312                         TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
 313
 314         if (gpio_is_valid(nreset_gpio))
 315                 gpio_set_value(nreset_gpio, 0);
 316
 317         /* wait for at least 2 vsyncs before cutting off power */
 318         msleep(50);
 319
 320         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_STANDBY);
 321
 322         regulator_disable(tpo_td043->vcc_reg);
 323
 324         if (dssdev->platform_disable)
 325                 dssdev->platform_disable(dssdev);
 326
 327         omapdss_dpi_display_disable(dssdev);
 328 }
 329
 330 static int tpo_td043_enable(struct omap_dss_device *dssdev)
 331 {
 332         int ret;
 333
 334         dev_dbg(&dssdev->dev, "enable\n");
 335
 336         ret = tpo_td043_power_on(dssdev);
 337         if (ret)
 338                 return ret;
 339
 340         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 341
 342         return 0;
 343 }
 344
 345 static void tpo_td043_disable(struct omap_dss_device *dssdev)
 346 {
 347         dev_dbg(&dssdev->dev, "disable\n");
 348
 349         tpo_td043_power_off(dssdev);
 350
 351         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 352 }
 353
 354 static int tpo_td043_suspend(struct omap_dss_device *dssdev)
 355 {
 356         tpo_td043_power_off(dssdev);
 357         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
 358         return 0;
 359 }
 360
 361 static int tpo_td043_resume(struct omap_dss_device *dssdev)
 362 {
 363         int r = 0;
 364
 365         r = tpo_td043_power_on(dssdev);
 366         if (r)
 367                 return r;
 368
 369         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 370
 371         return 0;
 372 }
 373
 374 static int tpo_td043_probe(struct omap_dss_device *dssdev)
 375 {
 376         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 377         int nreset_gpio = dssdev->reset_gpio;
 378         int ret = 0;
 379
 380         dev_dbg(&dssdev->dev, "probe\n");
 381
 382         if (tpo_td043 == NULL) {
 383                 dev_err(&dssdev->dev, "missing tpo_td043_device\n");
 384                 return -ENODEV;
 385         }
 386
 387         dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IHS |
 388                                 OMAP_DSS_LCD_IVS | OMAP_DSS_LCD_IPC;
 389         dssdev->panel.timings = tpo_td043_timings;
 390         dssdev->ctrl.pixel_size = 24;
 391
 392         tpo_td043->mode = TPO_R02_MODE_800x480;
 393         memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma));
 394
 395         tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc");
 396         if (IS_ERR(tpo_td043->vcc_reg)) {
 397                 dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n");
 398                 ret = PTR_ERR(tpo_td043->vcc_reg);
 399                 goto fail_regulator;
 400         }
 401
 402         if (gpio_is_valid(nreset_gpio)) {
 403                 ret = gpio_request(nreset_gpio, "lcd reset");
 404                 if (ret < 0) {
 405                         dev_err(&dssdev->dev, "couldn't request reset GPIO\n");
 406                         goto fail_gpio_req;
 407                 }
 408
 409                 ret = gpio_direction_output(nreset_gpio, 0);
 410                 if (ret < 0) {
 411                         dev_err(&dssdev->dev, "couldn't set GPIO direction\n");
 412                         goto fail_gpio_direction;
 413                 }
 414         }
 415
 416         ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 417         if (ret)
 418                 dev_warn(&dssdev->dev, "failed to create sysfs files\n");
 419
 420         return 0;
 421
 422 fail_gpio_direction:
 423         gpio_free(nreset_gpio);
 424 fail_gpio_req:
 425         regulator_put(tpo_td043->vcc_reg);
 426 fail_regulator:
 427         kfree(tpo_td043);
 428         return ret;
 429 }
 430
 431 static void tpo_td043_remove(struct omap_dss_device *dssdev)
 432 {
 433         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 434         int nreset_gpio = dssdev->reset_gpio;
 435
 436         dev_dbg(&dssdev->dev, "remove\n");
 437
 438         sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 439         regulator_put(tpo_td043->vcc_reg);
 440         if (gpio_is_valid(nreset_gpio))
 441                 gpio_free(nreset_gpio);
 442 }
 443
 444 static struct omap_dss_driver tpo_td043_driver = {
 445         .probe          = tpo_td043_probe,
 446         .remove         = tpo_td043_remove,
 447
 448         .enable         = tpo_td043_enable,
 449         .disable        = tpo_td043_disable,
 450         .suspend        = tpo_td043_suspend,
 451         .resume         = tpo_td043_resume,
 452         .set_mirror     = tpo_td043_set_hmirror,
 453         .get_mirror     = tpo_td043_get_hmirror,
 454
 455         .driver         = {
 456                 .name   = "tpo_td043mtea1_panel",
 457                 .owner  = THIS_MODULE,
 458         },
 459 };
 460
 461 static int tpo_td043_spi_probe(struct spi_device *spi)
 462 {
 463         struct omap_dss_device *dssdev = spi->dev.platform_data;
 464         struct tpo_td043_device *tpo_td043;
 465         int ret;
 466
 467         if (dssdev == NULL) {
 468                 dev_err(&spi->dev, "missing dssdev\n");
 469                 return -ENODEV;
 470         }
 471
 472         spi->bits_per_word = 16;
 473         spi->mode = SPI_MODE_0;
 474
 475         ret = spi_setup(spi);
 476         if (ret < 0) {
 477                 dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
 478                 return ret;
 479         }
 480
 481         tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL);
 482         if (tpo_td043 == NULL)
 483                 return -ENOMEM;
 484
 485         tpo_td043->spi = spi;
 486         dev_set_drvdata(&spi->dev, tpo_td043);
 487         dev_set_drvdata(&dssdev->dev, tpo_td043);
 488
 489         omap_dss_register_driver(&tpo_td043_driver);
 490
 491         return 0;
 492 }
 493
 494 static int __devexit tpo_td043_spi_remove(struct spi_device *spi)
 495 {
 496         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev);
 497
 498         omap_dss_unregister_driver(&tpo_td043_driver);
 499         kfree(tpo_td043);
 500
 501         return 0;
 502 }
 503
 504 static struct spi_driver tpo_td043_spi_driver = {
 505         .driver = {
 506                 .name   = "tpo_td043mtea1_panel_spi",
 507                 .bus    = &spi_bus_type,
 508                 .owner  = THIS_MODULE,
 509         },
 510         .probe  = tpo_td043_spi_probe,
 511         .remove = __devexit_p(tpo_td043_spi_remove),
 512 };
 513
 514 static int __init tpo_td043_init(void)
 515 {
 516         return spi_register_driver(&tpo_td043_spi_driver);
 517 }
 518
 519 static void __exit tpo_td043_exit(void)
 520 {
 521         spi_unregister_driver(&tpo_td043_spi_driver);
 522 }
 523
 524 module_init(tpo_td043_init);
 525 module_exit(tpo_td043_exit);
 526
 527 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
 528 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
 529 MODULE_LICENSE("GPL");