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         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         int val;
 148         int ret;
 149
 150         ret = kstrtoint(buf, 0, &val);
 151         if (ret < 0)
 152                 return ret;
 153
 154         val = !!val;
 155
 156         ret = tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, val);
 157         if (ret < 0)
 158                 return ret;
 159
 160         tpo_td043->vmirror = val;
 161
 162         return count;
 163 }
 164
 165 static ssize_t tpo_td043_mode_show(struct device *dev,
 166         struct device_attribute *attr, char *buf)
 167 {
 168         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 169
 170         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->mode);
 171 }
 172
 173 static ssize_t tpo_td043_mode_store(struct device *dev,
 174         struct device_attribute *attr, const char *buf, size_t count)
 175 {
 176         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 177         long val;
 178         int ret;
 179
 180         ret = kstrtol(buf, 0, &val);
 181         if (ret != 0 || val & ~7)
 182                 return -EINVAL;
 183
 184         tpo_td043->mode = val;
 185
 186         val |= TPO_R02_NCLK_RISING;
 187         tpo_td043_write(tpo_td043->spi, 2, val);
 188
 189         return count;
 190 }
 191
 192 static ssize_t tpo_td043_gamma_show(struct device *dev,
 193         struct device_attribute *attr, char *buf)
 194 {
 195         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 196         ssize_t len = 0;
 197         int ret;
 198         int i;
 199
 200         for (i = 0; i < ARRAY_SIZE(tpo_td043->gamma); i++) {
 201                 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
 202                                 tpo_td043->gamma[i]);
 203                 if (ret < 0)
 204                         return ret;
 205                 len += ret;
 206         }
 207         buf[len - 1] = '\n';
 208
 209         return len;
 210 }
 211
 212 static ssize_t tpo_td043_gamma_store(struct device *dev,
 213         struct device_attribute *attr, const char *buf, size_t count)
 214 {
 215         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 216         unsigned int g[12];
 217         int ret;
 218         int i;
 219
 220         ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
 221                         &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
 222                         &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
 223
 224         if (ret != 12)
 225                 return -EINVAL;
 226
 227         for (i = 0; i < 12; i++)
 228                 tpo_td043->gamma[i] = g[i];
 229
 230         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
 231
 232         return count;
 233 }
 234
 235 static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
 236                 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
 237 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 238                 tpo_td043_mode_show, tpo_td043_mode_store);
 239 static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
 240                 tpo_td043_gamma_show, tpo_td043_gamma_store);
 241
 242 static struct attribute *tpo_td043_attrs[] = {
 243         &dev_attr_vmirror.attr,
 244         &dev_attr_mode.attr,
 245         &dev_attr_gamma.attr,
 246         NULL,
 247 };
 248
 249 static struct attribute_group tpo_td043_attr_group = {
 250         .attrs = tpo_td043_attrs,
 251 };
 252
 253 static const struct omap_video_timings tpo_td043_timings = {
 254         .x_res          = 800,
 255         .y_res          = 480,
 256
 257         .pixel_clock    = 36000,
 258
 259         .hsw            = 1,
 260         .hfp            = 68,
 261         .hbp            = 214,
 262
 263         .vsw            = 1,
 264         .vfp            = 39,
 265         .vbp            = 34,
 266 };
 267
 268 static int tpo_td043_power_on(struct omap_dss_device *dssdev)
 269 {
 270         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 271         int nreset_gpio = dssdev->reset_gpio;
 272         int r;
 273
 274         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 275                 return 0;
 276
 277         r = omapdss_dpi_display_enable(dssdev);
 278         if (r)
 279                 goto err0;
 280
 281         if (dssdev->platform_enable) {
 282                 r = dssdev->platform_enable(dssdev);
 283                 if (r)
 284                         goto err1;
 285         }
 286
 287         regulator_enable(tpo_td043->vcc_reg);
 288
 289         /* wait for power up */
 290         msleep(160);
 291
 292         if (gpio_is_valid(nreset_gpio))
 293                 gpio_set_value(nreset_gpio, 1);
 294
 295         tpo_td043_write(tpo_td043->spi, 2,
 296                         TPO_R02_MODE(tpo_td043->mode) | TPO_R02_NCLK_RISING);
 297         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_NORMAL);
 298         tpo_td043_write(tpo_td043->spi, 0x20, 0xf0);
 299         tpo_td043_write(tpo_td043->spi, 0x21, 0xf0);
 300         tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
 301                         tpo_td043->vmirror);
 302         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
 303
 304         return 0;
 305 err1:
 306         omapdss_dpi_display_disable(dssdev);
 307 err0:
 308         return r;
 309 }
 310
 311 static void tpo_td043_power_off(struct omap_dss_device *dssdev)
 312 {
 313         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 314         int nreset_gpio = dssdev->reset_gpio;
 315
 316         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 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         if (dssdev->platform_disable)
 333                 dssdev->platform_disable(dssdev);
 334
 335         omapdss_dpi_display_disable(dssdev);
 336 }
 337
 338 static int tpo_td043_enable(struct omap_dss_device *dssdev)
 339 {
 340         int ret;
 341
 342         dev_dbg(&dssdev->dev, "enable\n");
 343
 344         ret = tpo_td043_power_on(dssdev);
 345         if (ret)
 346                 return ret;
 347
 348         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 349
 350         return 0;
 351 }
 352
 353 static void tpo_td043_disable(struct omap_dss_device *dssdev)
 354 {
 355         dev_dbg(&dssdev->dev, "disable\n");
 356
 357         tpo_td043_power_off(dssdev);
 358
 359         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 360 }
 361
 362 static int tpo_td043_suspend(struct omap_dss_device *dssdev)
 363 {
 364         tpo_td043_power_off(dssdev);
 365         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
 366         return 0;
 367 }
 368
 369 static int tpo_td043_resume(struct omap_dss_device *dssdev)
 370 {
 371         int r = 0;
 372
 373         r = tpo_td043_power_on(dssdev);
 374         if (r)
 375                 return r;
 376
 377         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 378
 379         return 0;
 380 }
 381
 382 static int tpo_td043_probe(struct omap_dss_device *dssdev)
 383 {
 384         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 385         int nreset_gpio = dssdev->reset_gpio;
 386         int ret = 0;
 387
 388         dev_dbg(&dssdev->dev, "probe\n");
 389
 390         if (tpo_td043 == NULL) {
 391                 dev_err(&dssdev->dev, "missing tpo_td043_device\n");
 392                 return -ENODEV;
 393         }
 394
 395         dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IHS |
 396                                 OMAP_DSS_LCD_IVS | OMAP_DSS_LCD_IPC;
 397         dssdev->panel.timings = tpo_td043_timings;
 398         dssdev->ctrl.pixel_size = 24;
 399
 400         tpo_td043->mode = TPO_R02_MODE_800x480;
 401         memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma));
 402
 403         tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc");
 404         if (IS_ERR(tpo_td043->vcc_reg)) {
 405                 dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n");
 406                 ret = PTR_ERR(tpo_td043->vcc_reg);
 407                 goto fail_regulator;
 408         }
 409
 410         if (gpio_is_valid(nreset_gpio)) {
 411                 ret = gpio_request(nreset_gpio, "lcd reset");
 412                 if (ret < 0) {
 413                         dev_err(&dssdev->dev, "couldn't request reset GPIO\n");
 414                         goto fail_gpio_req;
 415                 }
 416
 417                 ret = gpio_direction_output(nreset_gpio, 0);
 418                 if (ret < 0) {
 419                         dev_err(&dssdev->dev, "couldn't set GPIO direction\n");
 420                         goto fail_gpio_direction;
 421                 }
 422         }
 423
 424         ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 425         if (ret)
 426                 dev_warn(&dssdev->dev, "failed to create sysfs files\n");
 427
 428         return 0;
 429
 430 fail_gpio_direction:
 431         gpio_free(nreset_gpio);
 432 fail_gpio_req:
 433         regulator_put(tpo_td043->vcc_reg);
 434 fail_regulator:
 435         kfree(tpo_td043);
 436         return ret;
 437 }
 438
 439 static void tpo_td043_remove(struct omap_dss_device *dssdev)
 440 {
 441         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 442         int nreset_gpio = dssdev->reset_gpio;
 443
 444         dev_dbg(&dssdev->dev, "remove\n");
 445
 446         sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 447         regulator_put(tpo_td043->vcc_reg);
 448         if (gpio_is_valid(nreset_gpio))
 449                 gpio_free(nreset_gpio);
 450 }
 451
 452 static struct omap_dss_driver tpo_td043_driver = {
 453         .probe          = tpo_td043_probe,
 454         .remove         = tpo_td043_remove,
 455
 456         .enable         = tpo_td043_enable,
 457         .disable        = tpo_td043_disable,
 458         .suspend        = tpo_td043_suspend,
 459         .resume         = tpo_td043_resume,
 460         .set_mirror     = tpo_td043_set_hmirror,
 461         .get_mirror     = tpo_td043_get_hmirror,
 462
 463         .driver         = {
 464                 .name   = "tpo_td043mtea1_panel",
 465                 .owner  = THIS_MODULE,
 466         },
 467 };
 468
 469 static int tpo_td043_spi_probe(struct spi_device *spi)
 470 {
 471         struct omap_dss_device *dssdev = spi->dev.platform_data;
 472         struct tpo_td043_device *tpo_td043;
 473         int ret;
 474
 475         if (dssdev == NULL) {
 476                 dev_err(&spi->dev, "missing dssdev\n");
 477                 return -ENODEV;
 478         }
 479
 480         spi->bits_per_word = 16;
 481         spi->mode = SPI_MODE_0;
 482
 483         ret = spi_setup(spi);
 484         if (ret < 0) {
 485                 dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
 486                 return ret;
 487         }
 488
 489         tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL);
 490         if (tpo_td043 == NULL)
 491                 return -ENOMEM;
 492
 493         tpo_td043->spi = spi;
 494         dev_set_drvdata(&spi->dev, tpo_td043);
 495         dev_set_drvdata(&dssdev->dev, tpo_td043);
 496
 497         omap_dss_register_driver(&tpo_td043_driver);
 498
 499         return 0;
 500 }
 501
 502 static int __devexit tpo_td043_spi_remove(struct spi_device *spi)
 503 {
 504         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev);
 505
 506         omap_dss_unregister_driver(&tpo_td043_driver);
 507         kfree(tpo_td043);
 508
 509         return 0;
 510 }
 511
 512 static struct spi_driver tpo_td043_spi_driver = {
 513         .driver = {
 514                 .name   = "tpo_td043mtea1_panel_spi",
 515                 .owner  = THIS_MODULE,
 516         },
 517         .probe  = tpo_td043_spi_probe,
 518         .remove = __devexit_p(tpo_td043_spi_remove),
 519 };
 520
 521 static int __init tpo_td043_init(void)
 522 {
 523         return spi_register_driver(&tpo_td043_spi_driver);
 524 }
 525
 526 static void __exit tpo_td043_exit(void)
 527 {
 528         spi_unregister_driver(&tpo_td043_spi_driver);
 529 }
 530
 531 module_init(tpo_td043_init);
 532 module_exit(tpo_td043_exit);
 533
 534 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
 535 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
 536 MODULE_LICENSE("GPL");