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