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         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
 272         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
 273         .data_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
 274         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
 275         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
 276 };
 277
 278 static int tpo_td043_power_on(struct tpo_td043_device *tpo_td043)
 279 {
 280         int nreset_gpio = tpo_td043->nreset_gpio;
 281         int r;
 282
 283         if (tpo_td043->powered_on)
 284                 return 0;
 285
 286         r = regulator_enable(tpo_td043->vcc_reg);
 287         if (r != 0)
 288                 return r;
 289
 290         /* wait for panel to stabilize */
 291         msleep(160);
 292
 293         if (gpio_is_valid(nreset_gpio))
 294                 gpio_set_value(nreset_gpio, 1);
 295
 296         tpo_td043_write(tpo_td043->spi, 2,
 297                         TPO_R02_MODE(tpo_td043->mode) | TPO_R02_NCLK_RISING);
 298         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_NORMAL);
 299         tpo_td043_write(tpo_td043->spi, 0x20, 0xf0);
 300         tpo_td043_write(tpo_td043->spi, 0x21, 0xf0);
 301         tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
 302                         tpo_td043->vmirror);
 303         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
 304
 305         tpo_td043->powered_on = 1;
 306         return 0;
 307 }
 308
 309 static void tpo_td043_power_off(struct tpo_td043_device *tpo_td043)
 310 {
 311         int nreset_gpio = tpo_td043->nreset_gpio;
 312
 313         if (!tpo_td043->powered_on)
 314                 return;
 315
 316         tpo_td043_write(tpo_td043->spi, 3,
 317                         TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
 318
 319         if (gpio_is_valid(nreset_gpio))
 320                 gpio_set_value(nreset_gpio, 0);
 321
 322         /* wait for at least 2 vsyncs before cutting off power */
 323         msleep(50);
 324
 325         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_STANDBY);
 326
 327         regulator_disable(tpo_td043->vcc_reg);
 328
 329         tpo_td043->powered_on = 0;
 330 }
 331
 332 static int tpo_td043_enable_dss(struct omap_dss_device *dssdev)
 333 {
 334         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 335         int r;
 336
 337         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 338                 return 0;
 339
 340         omapdss_dpi_set_timings(dssdev, &dssdev->panel.timings);
 341         omapdss_dpi_set_data_lines(dssdev, dssdev->phy.dpi.data_lines);
 342
 343         r = omapdss_dpi_display_enable(dssdev);
 344         if (r)
 345                 goto err0;
 346
 347         if (dssdev->platform_enable) {
 348                 r = dssdev->platform_enable(dssdev);
 349                 if (r)
 350                         goto err1;
 351         }
 352
 353         /*
 354          * If we are resuming from system suspend, SPI clocks might not be
 355          * enabled yet, so we'll program the LCD from SPI PM resume callback.
 356          */
 357         if (!tpo_td043->spi_suspended) {
 358                 r = tpo_td043_power_on(tpo_td043);
 359                 if (r)
 360                         goto err1;
 361         }
 362
 363         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 364
 365         return 0;
 366 err1:
 367         omapdss_dpi_display_disable(dssdev);
 368 err0:
 369         return r;
 370 }
 371
 372 static void tpo_td043_disable_dss(struct omap_dss_device *dssdev)
 373 {
 374         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 375
 376         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 377                 return;
 378
 379         if (dssdev->platform_disable)
 380                 dssdev->platform_disable(dssdev);
 381
 382         omapdss_dpi_display_disable(dssdev);
 383
 384         if (!tpo_td043->spi_suspended)
 385                 tpo_td043_power_off(tpo_td043);
 386 }
 387
 388 static int tpo_td043_enable(struct omap_dss_device *dssdev)
 389 {
 390         dev_dbg(&dssdev->dev, "enable\n");
 391
 392         return tpo_td043_enable_dss(dssdev);
 393 }
 394
 395 static void tpo_td043_disable(struct omap_dss_device *dssdev)
 396 {
 397         dev_dbg(&dssdev->dev, "disable\n");
 398
 399         tpo_td043_disable_dss(dssdev);
 400
 401         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 402 }
 403
 404 static int tpo_td043_probe(struct omap_dss_device *dssdev)
 405 {
 406         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 407         int nreset_gpio = dssdev->reset_gpio;
 408         int ret = 0;
 409
 410         dev_dbg(&dssdev->dev, "probe\n");
 411
 412         if (tpo_td043 == NULL) {
 413                 dev_err(&dssdev->dev, "missing tpo_td043_device\n");
 414                 return -ENODEV;
 415         }
 416
 417         dssdev->panel.timings = tpo_td043_timings;
 418         dssdev->ctrl.pixel_size = 24;
 419
 420         tpo_td043->mode = TPO_R02_MODE_800x480;
 421         memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma));
 422
 423         tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc");
 424         if (IS_ERR(tpo_td043->vcc_reg)) {
 425                 dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n");
 426                 ret = PTR_ERR(tpo_td043->vcc_reg);
 427                 goto fail_regulator;
 428         }
 429
 430         if (gpio_is_valid(nreset_gpio)) {
 431                 ret = gpio_request_one(nreset_gpio, GPIOF_OUT_INIT_LOW,
 432                                         "lcd reset");
 433                 if (ret < 0) {
 434                         dev_err(&dssdev->dev, "couldn't request reset GPIO\n");
 435                         goto fail_gpio_req;
 436                 }
 437         }
 438
 439         ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 440         if (ret)
 441                 dev_warn(&dssdev->dev, "failed to create sysfs files\n");
 442
 443         return 0;
 444
 445 fail_gpio_req:
 446         regulator_put(tpo_td043->vcc_reg);
 447 fail_regulator:
 448         kfree(tpo_td043);
 449         return ret;
 450 }
 451
 452 static void tpo_td043_remove(struct omap_dss_device *dssdev)
 453 {
 454         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 455         int nreset_gpio = dssdev->reset_gpio;
 456
 457         dev_dbg(&dssdev->dev, "remove\n");
 458
 459         sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 460         regulator_put(tpo_td043->vcc_reg);
 461         if (gpio_is_valid(nreset_gpio))
 462                 gpio_free(nreset_gpio);
 463 }
 464
 465 static void tpo_td043_set_timings(struct omap_dss_device *dssdev,
 466                 struct omap_video_timings *timings)
 467 {
 468         omapdss_dpi_set_timings(dssdev, timings);
 469
 470         dssdev->panel.timings = *timings;
 471 }
 472
 473 static int tpo_td043_check_timings(struct omap_dss_device *dssdev,
 474                 struct omap_video_timings *timings)
 475 {
 476         return dpi_check_timings(dssdev, timings);
 477 }
 478
 479 static struct omap_dss_driver tpo_td043_driver = {
 480         .probe          = tpo_td043_probe,
 481         .remove         = tpo_td043_remove,
 482
 483         .enable         = tpo_td043_enable,
 484         .disable        = tpo_td043_disable,
 485         .set_mirror     = tpo_td043_set_hmirror,
 486         .get_mirror     = tpo_td043_get_hmirror,
 487
 488         .set_timings    = tpo_td043_set_timings,
 489         .check_timings  = tpo_td043_check_timings,
 490
 491         .driver         = {
 492                 .name   = "tpo_td043mtea1_panel",
 493                 .owner  = THIS_MODULE,
 494         },
 495 };
 496
 497 static int tpo_td043_spi_probe(struct spi_device *spi)
 498 {
 499         struct omap_dss_device *dssdev = spi->dev.platform_data;
 500         struct tpo_td043_device *tpo_td043;
 501         int ret;
 502
 503         if (dssdev == NULL) {
 504                 dev_err(&spi->dev, "missing dssdev\n");
 505                 return -ENODEV;
 506         }
 507
 508         spi->bits_per_word = 16;
 509         spi->mode = SPI_MODE_0;
 510
 511         ret = spi_setup(spi);
 512         if (ret < 0) {
 513                 dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
 514                 return ret;
 515         }
 516
 517         tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL);
 518         if (tpo_td043 == NULL)
 519                 return -ENOMEM;
 520
 521         tpo_td043->spi = spi;
 522         tpo_td043->nreset_gpio = dssdev->reset_gpio;
 523         dev_set_drvdata(&spi->dev, tpo_td043);
 524         dev_set_drvdata(&dssdev->dev, tpo_td043);
 525
 526         omap_dss_register_driver(&tpo_td043_driver);
 527
 528         return 0;
 529 }
 530
 531 static int __devexit tpo_td043_spi_remove(struct spi_device *spi)
 532 {
 533         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev);
 534
 535         omap_dss_unregister_driver(&tpo_td043_driver);
 536         kfree(tpo_td043);
 537
 538         return 0;
 539 }
 540
 541 #ifdef CONFIG_PM_SLEEP
 542 static int tpo_td043_spi_suspend(struct device *dev)
 543 {
 544         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 545
 546         dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", tpo_td043);
 547
 548         tpo_td043->power_on_resume = tpo_td043->powered_on;
 549         tpo_td043_power_off(tpo_td043);
 550         tpo_td043->spi_suspended = 1;
 551
 552         return 0;
 553 }
 554
 555 static int tpo_td043_spi_resume(struct device *dev)
 556 {
 557         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 558         int ret;
 559
 560         dev_dbg(dev, "tpo_td043_spi_resume\n");
 561
 562         if (tpo_td043->power_on_resume) {
 563                 ret = tpo_td043_power_on(tpo_td043);
 564                 if (ret)
 565                         return ret;
 566         }
 567         tpo_td043->spi_suspended = 0;
 568
 569         return 0;
 570 }
 571 #endif
 572
 573 static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm,
 574         tpo_td043_spi_suspend, tpo_td043_spi_resume);
 575
 576 static struct spi_driver tpo_td043_spi_driver = {
 577         .driver = {
 578                 .name   = "tpo_td043mtea1_panel_spi",
 579                 .owner  = THIS_MODULE,
 580                 .pm     = &tpo_td043_spi_pm,
 581         },
 582         .probe  = tpo_td043_spi_probe,
 583         .remove = __devexit_p(tpo_td043_spi_remove),
 584 };
 585
 586 module_spi_driver(tpo_td043_spi_driver);
 587
 588 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
 589 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
 590 MODULE_LICENSE("GPL");