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 <video/omapdss.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         105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
  51 };
  52
  53 struct tpo_td043_device {
  54         struct spi_device *spi;
  55         struct regulator *vcc_reg;
  56         int nreset_gpio;
  57         u16 gamma[12];
  58         u32 mode;
  59         u32 hmirror:1;
  60         u32 vmirror:1;
  61         u32 powered_on:1;
  62         u32 spi_suspended:1;
  63         u32 power_on_resume:1;
  64 };
  65
  66 static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
  67 {
  68         struct spi_message      m;
  69         struct spi_transfer     xfer;
  70         u16                     w;
  71         int                     r;
  72
  73         spi_message_init(&m);
  74
  75         memset(&xfer, 0, sizeof(xfer));
  76
  77         w = ((u16)addr << 10) | (1 << 8) | data;
  78         xfer.tx_buf = &w;
  79         xfer.bits_per_word = 16;
  80         xfer.len = 2;
  81         spi_message_add_tail(&xfer, &m);
  82
  83         r = spi_sync(spi, &m);
  84         if (r < 0)
  85                 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
  86         return r;
  87 }
  88
  89 static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
  90 {
  91         u8 i, val;
  92
  93         /* gamma bits [9:8] */
  94         for (val = i = 0; i < 4; i++)
  95                 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
  96         tpo_td043_write(spi, 0x11, val);
  97
  98         for (val = i = 0; i < 4; i++)
  99                 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
 100         tpo_td043_write(spi, 0x12, val);
 101
 102         for (val = i = 0; i < 4; i++)
 103                 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
 104         tpo_td043_write(spi, 0x13, val);
 105
 106         /* gamma bits [7:0] */
 107         for (val = i = 0; i < 12; i++)
 108                 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
 109 }
 110
 111 static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
 112 {
 113         u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V | \
 114                 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
 115         if (h)
 116                 reg4 &= ~TPO_R04_NFLIP_H;
 117         if (v)
 118                 reg4 &= ~TPO_R04_NFLIP_V;
 119
 120         return tpo_td043_write(spi, 4, reg4);
 121 }
 122
 123 static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
 124 {
 125         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 126
 127         tpo_td043->hmirror = enable;
 128         return tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
 129                         tpo_td043->vmirror);
 130 }
 131
 132 static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
 133 {
 134         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 135
 136         return tpo_td043->hmirror;
 137 }
 138
 139 static ssize_t tpo_td043_vmirror_show(struct device *dev,
 140         struct device_attribute *attr, char *buf)
 141 {
 142         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 143
 144         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->vmirror);
 145 }
 146
 147 static ssize_t tpo_td043_vmirror_store(struct device *dev,
 148         struct device_attribute *attr, const char *buf, size_t count)
 149 {
 150         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 151         int val;
 152         int ret;
 153
 154         ret = kstrtoint(buf, 0, &val);
 155         if (ret < 0)
 156                 return ret;
 157
 158         val = !!val;
 159
 160         ret = tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, val);
 161         if (ret < 0)
 162                 return ret;
 163
 164         tpo_td043->vmirror = val;
 165
 166         return count;
 167 }
 168
 169 static ssize_t tpo_td043_mode_show(struct device *dev,
 170         struct device_attribute *attr, char *buf)
 171 {
 172         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 173
 174         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->mode);
 175 }
 176
 177 static ssize_t tpo_td043_mode_store(struct device *dev,
 178         struct device_attribute *attr, const char *buf, size_t count)
 179 {
 180         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 181         long val;
 182         int ret;
 183
 184         ret = kstrtol(buf, 0, &val);
 185         if (ret != 0 || val & ~7)
 186                 return -EINVAL;
 187
 188         tpo_td043->mode = val;
 189
 190         val |= TPO_R02_NCLK_RISING;
 191         tpo_td043_write(tpo_td043->spi, 2, val);
 192
 193         return count;
 194 }
 195
 196 static ssize_t tpo_td043_gamma_show(struct device *dev,
 197         struct device_attribute *attr, char *buf)
 198 {
 199         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 200         ssize_t len = 0;
 201         int ret;
 202         int i;
 203
 204         for (i = 0; i < ARRAY_SIZE(tpo_td043->gamma); i++) {
 205                 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
 206                                 tpo_td043->gamma[i]);
 207                 if (ret < 0)
 208                         return ret;
 209                 len += ret;
 210         }
 211         buf[len - 1] = '\n';
 212
 213         return len;
 214 }
 215
 216 static ssize_t tpo_td043_gamma_store(struct device *dev,
 217         struct device_attribute *attr, const char *buf, size_t count)
 218 {
 219         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 220         unsigned int g[12];
 221         int ret;
 222         int i;
 223
 224         ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
 225                         &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
 226                         &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
 227
 228         if (ret != 12)
 229                 return -EINVAL;
 230
 231         for (i = 0; i < 12; i++)
 232                 tpo_td043->gamma[i] = g[i];
 233
 234         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
 235
 236         return count;
 237 }
 238
 239 static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
 240                 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
 241 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 242                 tpo_td043_mode_show, tpo_td043_mode_store);
 243 static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
 244                 tpo_td043_gamma_show, tpo_td043_gamma_store);
 245
 246 static struct attribute *tpo_td043_attrs[] = {
 247         &dev_attr_vmirror.attr,
 248         &dev_attr_mode.attr,
 249         &dev_attr_gamma.attr,
 250         NULL,
 251 };
 252
 253 static struct attribute_group tpo_td043_attr_group = {
 254         .attrs = tpo_td043_attrs,
 255 };
 256
 257 static const struct omap_video_timings tpo_td043_timings = {
 258         .x_res          = 800,
 259         .y_res          = 480,
 260
 261         .pixel_clock    = 36000,
 262
 263         .hsw            = 1,
 264         .hfp            = 68,
 265         .hbp            = 214,
 266
 267         .vsw            = 1,
 268         .vfp            = 39,
 269         .vbp            = 34,
 270 };
 271
 272 static int tpo_td043_power_on(struct tpo_td043_device *tpo_td043)
 273 {
 274         int nreset_gpio = tpo_td043->nreset_gpio;
 275         int r;
 276
 277         if (tpo_td043->powered_on)
 278                 return 0;
 279
 280         r = regulator_enable(tpo_td043->vcc_reg);
 281         if (r != 0)
 282                 return r;
 283
 284         /* wait for panel to stabilize */
 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         tpo_td043->powered_on = 1;
 300         return 0;
 301 }
 302
 303 static void tpo_td043_power_off(struct tpo_td043_device *tpo_td043)
 304 {
 305         int nreset_gpio = tpo_td043->nreset_gpio;
 306
 307         if (!tpo_td043->powered_on)
 308                 return;
 309
 310         tpo_td043_write(tpo_td043->spi, 3,
 311                         TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
 312
 313         if (gpio_is_valid(nreset_gpio))
 314                 gpio_set_value(nreset_gpio, 0);
 315
 316         /* wait for at least 2 vsyncs before cutting off power */
 317         msleep(50);
 318
 319         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_STANDBY);
 320
 321         regulator_disable(tpo_td043->vcc_reg);
 322
 323         tpo_td043->powered_on = 0;
 324 }
 325
 326 static int tpo_td043_enable_dss(struct omap_dss_device *dssdev)
 327 {
 328         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 329         int r;
 330
 331         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 332                 return 0;
 333
 334         r = omapdss_dpi_display_enable(dssdev);
 335         if (r)
 336                 goto err0;
 337
 338         if (dssdev->platform_enable) {
 339                 r = dssdev->platform_enable(dssdev);
 340                 if (r)
 341                         goto err1;
 342         }
 343
 344         /*
 345          * If we are resuming from system suspend, SPI clocks might not be
 346          * enabled yet, so we'll program the LCD from SPI PM resume callback.
 347          */
 348         if (!tpo_td043->spi_suspended) {
 349                 r = tpo_td043_power_on(tpo_td043);
 350                 if (r)
 351                         goto err1;
 352         }
 353
 354         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 355
 356         return 0;
 357 err1:
 358         omapdss_dpi_display_disable(dssdev);
 359 err0:
 360         return r;
 361 }
 362
 363 static void tpo_td043_disable_dss(struct omap_dss_device *dssdev)
 364 {
 365         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 366
 367         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 368                 return;
 369
 370         if (dssdev->platform_disable)
 371                 dssdev->platform_disable(dssdev);
 372
 373         omapdss_dpi_display_disable(dssdev);
 374
 375         if (!tpo_td043->spi_suspended)
 376                 tpo_td043_power_off(tpo_td043);
 377 }
 378
 379 static int tpo_td043_enable(struct omap_dss_device *dssdev)
 380 {
 381         dev_dbg(&dssdev->dev, "enable\n");
 382
 383         return tpo_td043_enable_dss(dssdev);
 384 }
 385
 386 static void tpo_td043_disable(struct omap_dss_device *dssdev)
 387 {
 388         dev_dbg(&dssdev->dev, "disable\n");
 389
 390         tpo_td043_disable_dss(dssdev);
 391
 392         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 393 }
 394
 395 static int tpo_td043_suspend(struct omap_dss_device *dssdev)
 396 {
 397         dev_dbg(&dssdev->dev, "suspend\n");
 398
 399         tpo_td043_disable_dss(dssdev);
 400
 401         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
 402
 403         return 0;
 404 }
 405
 406 static int tpo_td043_resume(struct omap_dss_device *dssdev)
 407 {
 408         dev_dbg(&dssdev->dev, "resume\n");
 409
 410         return tpo_td043_enable_dss(dssdev);
 411 }
 412
 413 static int tpo_td043_probe(struct omap_dss_device *dssdev)
 414 {
 415         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 416         int nreset_gpio = dssdev->reset_gpio;
 417         int ret = 0;
 418
 419         dev_dbg(&dssdev->dev, "probe\n");
 420
 421         if (tpo_td043 == NULL) {
 422                 dev_err(&dssdev->dev, "missing tpo_td043_device\n");
 423                 return -ENODEV;
 424         }
 425
 426         dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IHS |
 427                                 OMAP_DSS_LCD_IVS | OMAP_DSS_LCD_IPC;
 428         dssdev->panel.timings = tpo_td043_timings;
 429         dssdev->ctrl.pixel_size = 24;
 430
 431         tpo_td043->mode = TPO_R02_MODE_800x480;
 432         memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma));
 433
 434         tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc");
 435         if (IS_ERR(tpo_td043->vcc_reg)) {
 436                 dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n");
 437                 ret = PTR_ERR(tpo_td043->vcc_reg);
 438                 goto fail_regulator;
 439         }
 440
 441         if (gpio_is_valid(nreset_gpio)) {
 442                 ret = gpio_request_one(nreset_gpio, GPIOF_OUT_INIT_LOW,
 443                                         "lcd reset");
 444                 if (ret < 0) {
 445                         dev_err(&dssdev->dev, "couldn't request reset GPIO\n");
 446                         goto fail_gpio_req;
 447                 }
 448         }
 449
 450         ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 451         if (ret)
 452                 dev_warn(&dssdev->dev, "failed to create sysfs files\n");
 453
 454         return 0;
 455
 456 fail_gpio_req:
 457         regulator_put(tpo_td043->vcc_reg);
 458 fail_regulator:
 459         kfree(tpo_td043);
 460         return ret;
 461 }
 462
 463 static void tpo_td043_remove(struct omap_dss_device *dssdev)
 464 {
 465         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 466         int nreset_gpio = dssdev->reset_gpio;
 467
 468         dev_dbg(&dssdev->dev, "remove\n");
 469
 470         sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 471         regulator_put(tpo_td043->vcc_reg);
 472         if (gpio_is_valid(nreset_gpio))
 473                 gpio_free(nreset_gpio);
 474 }
 475
 476 static void tpo_td043_set_timings(struct omap_dss_device *dssdev,
 477                 struct omap_video_timings *timings)
 478 {
 479         dpi_set_timings(dssdev, timings);
 480 }
 481
 482 static int tpo_td043_check_timings(struct omap_dss_device *dssdev,
 483                 struct omap_video_timings *timings)
 484 {
 485         return dpi_check_timings(dssdev, timings);
 486 }
 487
 488 static struct omap_dss_driver tpo_td043_driver = {
 489         .probe          = tpo_td043_probe,
 490         .remove         = tpo_td043_remove,
 491
 492         .enable         = tpo_td043_enable,
 493         .disable        = tpo_td043_disable,
 494         .suspend        = tpo_td043_suspend,
 495         .resume         = tpo_td043_resume,
 496         .set_mirror     = tpo_td043_set_hmirror,
 497         .get_mirror     = tpo_td043_get_hmirror,
 498
 499         .set_timings    = tpo_td043_set_timings,
 500         .check_timings  = tpo_td043_check_timings,
 501
 502         .driver         = {
 503                 .name   = "tpo_td043mtea1_panel",
 504                 .owner  = THIS_MODULE,
 505         },
 506 };
 507
 508 static int tpo_td043_spi_probe(struct spi_device *spi)
 509 {
 510         struct omap_dss_device *dssdev = spi->dev.platform_data;
 511         struct tpo_td043_device *tpo_td043;
 512         int ret;
 513
 514         if (dssdev == NULL) {
 515                 dev_err(&spi->dev, "missing dssdev\n");
 516                 return -ENODEV;
 517         }
 518
 519         spi->bits_per_word = 16;
 520         spi->mode = SPI_MODE_0;
 521
 522         ret = spi_setup(spi);
 523         if (ret < 0) {
 524                 dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
 525                 return ret;
 526         }
 527
 528         tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL);
 529         if (tpo_td043 == NULL)
 530                 return -ENOMEM;
 531
 532         tpo_td043->spi = spi;
 533         tpo_td043->nreset_gpio = dssdev->reset_gpio;
 534         dev_set_drvdata(&spi->dev, tpo_td043);
 535         dev_set_drvdata(&dssdev->dev, tpo_td043);
 536
 537         omap_dss_register_driver(&tpo_td043_driver);
 538
 539         return 0;
 540 }
 541
 542 static int __devexit tpo_td043_spi_remove(struct spi_device *spi)
 543 {
 544         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev);
 545
 546         omap_dss_unregister_driver(&tpo_td043_driver);
 547         kfree(tpo_td043);
 548
 549         return 0;
 550 }
 551
 552 #ifdef CONFIG_PM_SLEEP
 553 static int tpo_td043_spi_suspend(struct device *dev)
 554 {
 555         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 556
 557         dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", tpo_td043);
 558
 559         tpo_td043->power_on_resume = tpo_td043->powered_on;
 560         tpo_td043_power_off(tpo_td043);
 561         tpo_td043->spi_suspended = 1;
 562
 563         return 0;
 564 }
 565
 566 static int tpo_td043_spi_resume(struct device *dev)
 567 {
 568         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 569         int ret;
 570
 571         dev_dbg(dev, "tpo_td043_spi_resume\n");
 572
 573         if (tpo_td043->power_on_resume) {
 574                 ret = tpo_td043_power_on(tpo_td043);
 575                 if (ret)
 576                         return ret;
 577         }
 578         tpo_td043->spi_suspended = 0;
 579
 580         return 0;
 581 }
 582 #endif
 583
 584 static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm,
 585         tpo_td043_spi_suspend, tpo_td043_spi_resume);
 586
 587 static struct spi_driver tpo_td043_spi_driver = {
 588         .driver = {
 589                 .name   = "tpo_td043mtea1_panel_spi",
 590                 .owner  = THIS_MODULE,
 591                 .pm     = &tpo_td043_spi_pm,
 592         },
 593         .probe  = tpo_td043_spi_probe,
 594         .remove = __devexit_p(tpo_td043_spi_remove),
 595 };
 596
 597 module_spi_driver(tpo_td043_spi_driver);
 598
 599 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
 600 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
 601 MODULE_LICENSE("GPL");