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 #include <video/omap-panel-data.h>
  22
  23 #define TPO_R02_MODE(x)         ((x) & 7)
  24 #define TPO_R02_MODE_800x480    7
  25 #define TPO_R02_NCLK_RISING     BIT(3)
  26 #define TPO_R02_HSYNC_HIGH      BIT(4)
  27 #define TPO_R02_VSYNC_HIGH      BIT(5)
  28
  29 #define TPO_R03_NSTANDBY        BIT(0)
  30 #define TPO_R03_EN_CP_CLK       BIT(1)
  31 #define TPO_R03_EN_VGL_PUMP     BIT(2)
  32 #define TPO_R03_EN_PWM          BIT(3)
  33 #define TPO_R03_DRIVING_CAP_100 BIT(4)
  34 #define TPO_R03_EN_PRE_CHARGE   BIT(6)
  35 #define TPO_R03_SOFTWARE_CTL    BIT(7)
  36
  37 #define TPO_R04_NFLIP_H         BIT(0)
  38 #define TPO_R04_NFLIP_V         BIT(1)
  39 #define TPO_R04_CP_CLK_FREQ_1H  BIT(2)
  40 #define TPO_R04_VGL_FREQ_1H     BIT(4)
  41
  42 #define TPO_R03_VAL_NORMAL (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | \
  43                         TPO_R03_EN_VGL_PUMP |  TPO_R03_EN_PWM | \
  44                         TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
  45                         TPO_R03_SOFTWARE_CTL)
  46
  47 #define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
  48                         TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
  49
  50 static const u16 tpo_td043_def_gamma[12] = {
  51         105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
  52 };
  53
  54 struct tpo_td043_device {
  55         struct spi_device *spi;
  56         struct regulator *vcc_reg;
  57         int nreset_gpio;
  58         u16 gamma[12];
  59         u32 mode;
  60         u32 hmirror:1;
  61         u32 vmirror:1;
  62         u32 powered_on:1;
  63         u32 spi_suspended:1;
  64         u32 power_on_resume:1;
  65 };
  66
  67 /* used to pass spi_device from SPI to DSS portion of the driver */
  68 static struct tpo_td043_device *g_tpo_td043;
  69
  70 static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
  71 {
  72         struct spi_message      m;
  73         struct spi_transfer     xfer;
  74         u16                     w;
  75         int                     r;
  76
  77         spi_message_init(&m);
  78
  79         memset(&xfer, 0, sizeof(xfer));
  80
  81         w = ((u16)addr << 10) | (1 << 8) | data;
  82         xfer.tx_buf = &w;
  83         xfer.bits_per_word = 16;
  84         xfer.len = 2;
  85         spi_message_add_tail(&xfer, &m);
  86
  87         r = spi_sync(spi, &m);
  88         if (r < 0)
  89                 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
  90         return r;
  91 }
  92
  93 static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
  94 {
  95         u8 i, val;
  96
  97         /* gamma bits [9:8] */
  98         for (val = i = 0; i < 4; i++)
  99                 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
 100         tpo_td043_write(spi, 0x11, val);
 101
 102         for (val = i = 0; i < 4; i++)
 103                 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
 104         tpo_td043_write(spi, 0x12, val);
 105
 106         for (val = i = 0; i < 4; i++)
 107                 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
 108         tpo_td043_write(spi, 0x13, val);
 109
 110         /* gamma bits [7:0] */
 111         for (val = i = 0; i < 12; i++)
 112                 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
 113 }
 114
 115 static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
 116 {
 117         u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V | \
 118                 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
 119         if (h)
 120                 reg4 &= ~TPO_R04_NFLIP_H;
 121         if (v)
 122                 reg4 &= ~TPO_R04_NFLIP_V;
 123
 124         return tpo_td043_write(spi, 4, reg4);
 125 }
 126
 127 static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
 128 {
 129         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 130
 131         tpo_td043->hmirror = enable;
 132         return tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
 133                         tpo_td043->vmirror);
 134 }
 135
 136 static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
 137 {
 138         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 139
 140         return tpo_td043->hmirror;
 141 }
 142
 143 static ssize_t tpo_td043_vmirror_show(struct device *dev,
 144         struct device_attribute *attr, char *buf)
 145 {
 146         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 147
 148         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->vmirror);
 149 }
 150
 151 static ssize_t tpo_td043_vmirror_store(struct device *dev,
 152         struct device_attribute *attr, const char *buf, size_t count)
 153 {
 154         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 155         int val;
 156         int ret;
 157
 158         ret = kstrtoint(buf, 0, &val);
 159         if (ret < 0)
 160                 return ret;
 161
 162         val = !!val;
 163
 164         ret = tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, val);
 165         if (ret < 0)
 166                 return ret;
 167
 168         tpo_td043->vmirror = val;
 169
 170         return count;
 171 }
 172
 173 static ssize_t tpo_td043_mode_show(struct device *dev,
 174         struct device_attribute *attr, char *buf)
 175 {
 176         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 177
 178         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->mode);
 179 }
 180
 181 static ssize_t tpo_td043_mode_store(struct device *dev,
 182         struct device_attribute *attr, const char *buf, size_t count)
 183 {
 184         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 185         long val;
 186         int ret;
 187
 188         ret = kstrtol(buf, 0, &val);
 189         if (ret != 0 || val & ~7)
 190                 return -EINVAL;
 191
 192         tpo_td043->mode = val;
 193
 194         val |= TPO_R02_NCLK_RISING;
 195         tpo_td043_write(tpo_td043->spi, 2, val);
 196
 197         return count;
 198 }
 199
 200 static ssize_t tpo_td043_gamma_show(struct device *dev,
 201         struct device_attribute *attr, char *buf)
 202 {
 203         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 204         ssize_t len = 0;
 205         int ret;
 206         int i;
 207
 208         for (i = 0; i < ARRAY_SIZE(tpo_td043->gamma); i++) {
 209                 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
 210                                 tpo_td043->gamma[i]);
 211                 if (ret < 0)
 212                         return ret;
 213                 len += ret;
 214         }
 215         buf[len - 1] = '\n';
 216
 217         return len;
 218 }
 219
 220 static ssize_t tpo_td043_gamma_store(struct device *dev,
 221         struct device_attribute *attr, const char *buf, size_t count)
 222 {
 223         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 224         unsigned int g[12];
 225         int ret;
 226         int i;
 227
 228         ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
 229                         &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
 230                         &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
 231
 232         if (ret != 12)
 233                 return -EINVAL;
 234
 235         for (i = 0; i < 12; i++)
 236                 tpo_td043->gamma[i] = g[i];
 237
 238         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
 239
 240         return count;
 241 }
 242
 243 static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
 244                 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
 245 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 246                 tpo_td043_mode_show, tpo_td043_mode_store);
 247 static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
 248                 tpo_td043_gamma_show, tpo_td043_gamma_store);
 249
 250 static struct attribute *tpo_td043_attrs[] = {
 251         &dev_attr_vmirror.attr,
 252         &dev_attr_mode.attr,
 253         &dev_attr_gamma.attr,
 254         NULL,
 255 };
 256
 257 static struct attribute_group tpo_td043_attr_group = {
 258         .attrs = tpo_td043_attrs,
 259 };
 260
 261 static const struct omap_video_timings tpo_td043_timings = {
 262         .x_res          = 800,
 263         .y_res          = 480,
 264
 265         .pixel_clock    = 36000,
 266
 267         .hsw            = 1,
 268         .hfp            = 68,
 269         .hbp            = 214,
 270
 271         .vsw            = 1,
 272         .vfp            = 39,
 273         .vbp            = 34,
 274
 275         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
 276         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
 277         .data_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
 278         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
 279         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
 280 };
 281
 282 static inline struct panel_tpo_td043_data
 283 *get_panel_data(const struct omap_dss_device *dssdev)
 284 {
 285         return (struct panel_tpo_td043_data *) dssdev->data;
 286 }
 287
 288 static int tpo_td043_power_on(struct tpo_td043_device *tpo_td043)
 289 {
 290         int r;
 291
 292         if (tpo_td043->powered_on)
 293                 return 0;
 294
 295         r = regulator_enable(tpo_td043->vcc_reg);
 296         if (r != 0)
 297                 return r;
 298
 299         /* wait for panel to stabilize */
 300         msleep(160);
 301
 302         if (gpio_is_valid(tpo_td043->nreset_gpio))
 303                 gpio_set_value(tpo_td043->nreset_gpio, 1);
 304
 305         tpo_td043_write(tpo_td043->spi, 2,
 306                         TPO_R02_MODE(tpo_td043->mode) | TPO_R02_NCLK_RISING);
 307         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_NORMAL);
 308         tpo_td043_write(tpo_td043->spi, 0x20, 0xf0);
 309         tpo_td043_write(tpo_td043->spi, 0x21, 0xf0);
 310         tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
 311                         tpo_td043->vmirror);
 312         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
 313
 314         tpo_td043->powered_on = 1;
 315         return 0;
 316 }
 317
 318 static void tpo_td043_power_off(struct tpo_td043_device *tpo_td043)
 319 {
 320         if (!tpo_td043->powered_on)
 321                 return;
 322
 323         tpo_td043_write(tpo_td043->spi, 3,
 324                         TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
 325
 326         if (gpio_is_valid(tpo_td043->nreset_gpio))
 327                 gpio_set_value(tpo_td043->nreset_gpio, 0);
 328
 329         /* wait for at least 2 vsyncs before cutting off power */
 330         msleep(50);
 331
 332         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_STANDBY);
 333
 334         regulator_disable(tpo_td043->vcc_reg);
 335
 336         tpo_td043->powered_on = 0;
 337 }
 338
 339 static int tpo_td043_enable_dss(struct omap_dss_device *dssdev)
 340 {
 341         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 342         int r;
 343
 344         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 345                 return 0;
 346
 347         omapdss_dpi_set_timings(dssdev, &dssdev->panel.timings);
 348         omapdss_dpi_set_data_lines(dssdev, dssdev->phy.dpi.data_lines);
 349
 350         r = omapdss_dpi_display_enable(dssdev);
 351         if (r)
 352                 goto err0;
 353
 354         /*
 355          * If we are resuming from system suspend, SPI clocks might not be
 356          * enabled yet, so we'll program the LCD from SPI PM resume callback.
 357          */
 358         if (!tpo_td043->spi_suspended) {
 359                 r = tpo_td043_power_on(tpo_td043);
 360                 if (r)
 361                         goto err1;
 362         }
 363
 364         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 365
 366         return 0;
 367 err1:
 368         omapdss_dpi_display_disable(dssdev);
 369 err0:
 370         return r;
 371 }
 372
 373 static void tpo_td043_disable_dss(struct omap_dss_device *dssdev)
 374 {
 375         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 376
 377         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 378                 return;
 379
 380         omapdss_dpi_display_disable(dssdev);
 381
 382         if (!tpo_td043->spi_suspended)
 383                 tpo_td043_power_off(tpo_td043);
 384 }
 385
 386 static int tpo_td043_enable(struct omap_dss_device *dssdev)
 387 {
 388         dev_dbg(&dssdev->dev, "enable\n");
 389
 390         return tpo_td043_enable_dss(dssdev);
 391 }
 392
 393 static void tpo_td043_disable(struct omap_dss_device *dssdev)
 394 {
 395         dev_dbg(&dssdev->dev, "disable\n");
 396
 397         tpo_td043_disable_dss(dssdev);
 398
 399         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 400 }
 401
 402 static int tpo_td043_probe(struct omap_dss_device *dssdev)
 403 {
 404         struct tpo_td043_device *tpo_td043 = g_tpo_td043;
 405         struct panel_tpo_td043_data *pdata = get_panel_data(dssdev);
 406         int ret = 0;
 407
 408         dev_dbg(&dssdev->dev, "probe\n");
 409
 410         if (tpo_td043 == NULL) {
 411                 dev_err(&dssdev->dev, "missing tpo_td043_device\n");
 412                 return -ENODEV;
 413         }
 414
 415         if (!pdata)
 416                 return -EINVAL;
 417
 418         tpo_td043->nreset_gpio = pdata->nreset_gpio;
 419
 420         dssdev->panel.timings = tpo_td043_timings;
 421         dssdev->ctrl.pixel_size = 24;
 422
 423         tpo_td043->mode = TPO_R02_MODE_800x480;
 424         memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma));
 425
 426         tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc");
 427         if (IS_ERR(tpo_td043->vcc_reg)) {
 428                 dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n");
 429                 ret = PTR_ERR(tpo_td043->vcc_reg);
 430                 goto fail_regulator;
 431         }
 432
 433         if (gpio_is_valid(tpo_td043->nreset_gpio)) {
 434                 ret = devm_gpio_request_one(&dssdev->dev,
 435                                 tpo_td043->nreset_gpio, GPIOF_OUT_INIT_LOW,
 436                                 "lcd reset");
 437                 if (ret < 0) {
 438                         dev_err(&dssdev->dev, "couldn't request reset GPIO\n");
 439                         goto fail_gpio_req;
 440                 }
 441         }
 442
 443         ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 444         if (ret)
 445                 dev_warn(&dssdev->dev, "failed to create sysfs files\n");
 446
 447         dev_set_drvdata(&dssdev->dev, tpo_td043);
 448
 449         return 0;
 450
 451 fail_gpio_req:
 452         regulator_put(tpo_td043->vcc_reg);
 453 fail_regulator:
 454         kfree(tpo_td043);
 455         return ret;
 456 }
 457
 458 static void tpo_td043_remove(struct omap_dss_device *dssdev)
 459 {
 460         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 461
 462         dev_dbg(&dssdev->dev, "remove\n");
 463
 464         sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 465         regulator_put(tpo_td043->vcc_reg);
 466 }
 467
 468 static void tpo_td043_set_timings(struct omap_dss_device *dssdev,
 469                 struct omap_video_timings *timings)
 470 {
 471         omapdss_dpi_set_timings(dssdev, timings);
 472
 473         dssdev->panel.timings = *timings;
 474 }
 475
 476 static int tpo_td043_check_timings(struct omap_dss_device *dssdev,
 477                 struct omap_video_timings *timings)
 478 {
 479         return dpi_check_timings(dssdev, timings);
 480 }
 481
 482 static struct omap_dss_driver tpo_td043_driver = {
 483         .probe          = tpo_td043_probe,
 484         .remove         = tpo_td043_remove,
 485
 486         .enable         = tpo_td043_enable,
 487         .disable        = tpo_td043_disable,
 488         .set_mirror     = tpo_td043_set_hmirror,
 489         .get_mirror     = tpo_td043_get_hmirror,
 490
 491         .set_timings    = tpo_td043_set_timings,
 492         .check_timings  = tpo_td043_check_timings,
 493
 494         .driver         = {
 495                 .name   = "tpo_td043mtea1_panel",
 496                 .owner  = THIS_MODULE,
 497         },
 498 };
 499
 500 static int tpo_td043_spi_probe(struct spi_device *spi)
 501 {
 502         struct omap_dss_device *dssdev = spi->dev.platform_data;
 503         struct tpo_td043_device *tpo_td043;
 504         int ret;
 505
 506         if (dssdev == NULL) {
 507                 dev_err(&spi->dev, "missing dssdev\n");
 508                 return -ENODEV;
 509         }
 510
 511         if (g_tpo_td043 != NULL)
 512                 return -EBUSY;
 513
 514         spi->bits_per_word = 16;
 515         spi->mode = SPI_MODE_0;
 516
 517         ret = spi_setup(spi);
 518         if (ret < 0) {
 519                 dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
 520                 return ret;
 521         }
 522
 523         tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL);
 524         if (tpo_td043 == NULL)
 525                 return -ENOMEM;
 526
 527         tpo_td043->spi = spi;
 528         dev_set_drvdata(&spi->dev, tpo_td043);
 529         g_tpo_td043 = tpo_td043;
 530
 531         omap_dss_register_driver(&tpo_td043_driver);
 532
 533         return 0;
 534 }
 535
 536 static int tpo_td043_spi_remove(struct spi_device *spi)
 537 {
 538         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev);
 539
 540         omap_dss_unregister_driver(&tpo_td043_driver);
 541         kfree(tpo_td043);
 542         g_tpo_td043 = NULL;
 543
 544         return 0;
 545 }
 546
 547 #ifdef CONFIG_PM_SLEEP
 548 static int tpo_td043_spi_suspend(struct device *dev)
 549 {
 550         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 551
 552         dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", tpo_td043);
 553
 554         tpo_td043->power_on_resume = tpo_td043->powered_on;
 555         tpo_td043_power_off(tpo_td043);
 556         tpo_td043->spi_suspended = 1;
 557
 558         return 0;
 559 }
 560
 561 static int tpo_td043_spi_resume(struct device *dev)
 562 {
 563         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 564         int ret;
 565
 566         dev_dbg(dev, "tpo_td043_spi_resume\n");
 567
 568         if (tpo_td043->power_on_resume) {
 569                 ret = tpo_td043_power_on(tpo_td043);
 570                 if (ret)
 571                         return ret;
 572         }
 573         tpo_td043->spi_suspended = 0;
 574
 575         return 0;
 576 }
 577 #endif
 578
 579 static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm,
 580         tpo_td043_spi_suspend, tpo_td043_spi_resume);
 581
 582 static struct spi_driver tpo_td043_spi_driver = {
 583         .driver = {
 584                 .name   = "tpo_td043mtea1_panel_spi",
 585                 .owner  = THIS_MODULE,
 586                 .pm     = &tpo_td043_spi_pm,
 587         },
 588         .probe  = tpo_td043_spi_probe,
 589         .remove = tpo_td043_spi_remove,
 590 };
 591
 592 module_spi_driver(tpo_td043_spi_driver);
 593
 594 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
 595 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
 596 MODULE_LICENSE("GPL");