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
  19 #include <plat/display.h>
  20
  21 #define TPO_R02_MODE(x)         ((x) & 7)
  22 #define TPO_R02_MODE_800x480    7
  23 #define TPO_R02_NCLK_RISING     BIT(3)
  24 #define TPO_R02_HSYNC_HIGH      BIT(4)
  25 #define TPO_R02_VSYNC_HIGH      BIT(5)
  26
  27 #define TPO_R03_NSTANDBY        BIT(0)
  28 #define TPO_R03_EN_CP_CLK       BIT(1)
  29 #define TPO_R03_EN_VGL_PUMP     BIT(2)
  30 #define TPO_R03_EN_PWM          BIT(3)
  31 #define TPO_R03_DRIVING_CAP_100 BIT(4)
  32 #define TPO_R03_EN_PRE_CHARGE   BIT(6)
  33 #define TPO_R03_SOFTWARE_CTL    BIT(7)
  34
  35 #define TPO_R04_NFLIP_H         BIT(0)
  36 #define TPO_R04_NFLIP_V         BIT(1)
  37 #define TPO_R04_CP_CLK_FREQ_1H  BIT(2)
  38 #define TPO_R04_VGL_FREQ_1H     BIT(4)
  39
  40 #define TPO_R03_VAL_NORMAL (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | \
  41                         TPO_R03_EN_VGL_PUMP |  TPO_R03_EN_PWM | \
  42                         TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
  43                         TPO_R03_SOFTWARE_CTL)
  44
  45 #define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
  46                         TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
  47
  48 static const u16 tpo_td043_def_gamma[12] = {
  49         106, 200, 289, 375, 460, 543, 625, 705, 785, 864, 942, 1020
  50 };
  51
  52 struct tpo_td043_device {
  53         struct spi_device *spi;
  54         struct regulator *vcc_reg;
  55         u16 gamma[12];
  56         u32 mode;
  57         u32 hmirror:1;
  58         u32 vmirror:1;
  59 };
  60
  61 static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
  62 {
  63         struct spi_message      m;
  64         struct spi_transfer     xfer;
  65         u16                     w;
  66         int                     r;
  67
  68         spi_message_init(&m);
  69
  70         memset(&xfer, 0, sizeof(xfer));
  71
  72         w = ((u16)addr << 10) | (1 << 8) | data;
  73         xfer.tx_buf = &w;
  74         xfer.bits_per_word = 16;
  75         xfer.len = 2;
  76         spi_message_add_tail(&xfer, &m);
  77
  78         r = spi_sync(spi, &m);
  79         if (r < 0)
  80                 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
  81         return r;
  82 }
  83
  84 static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
  85 {
  86         u8 i, val;
  87
  88         /* gamma bits [9:8] */
  89         for (val = i = 0; i < 4; i++)
  90                 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
  91         tpo_td043_write(spi, 0x11, val);
  92
  93         for (val = i = 0; i < 4; i++)
  94                 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
  95         tpo_td043_write(spi, 0x12, val);
  96
  97         for (val = i = 0; i < 4; i++)
  98                 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
  99         tpo_td043_write(spi, 0x13, val);
 100
 101         /* gamma bits [7:0] */
 102         for (val = i = 0; i < 12; i++)
 103                 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
 104 }
 105
 106 static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
 107 {
 108         u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V | \
 109                 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
 110         if (h)
 111                 reg4 &= ~TPO_R04_NFLIP_H;
 112         if (v)
 113                 reg4 &= ~TPO_R04_NFLIP_V;
 114
 115         return tpo_td043_write(spi, 4, reg4);
 116 }
 117
 118 static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
 119 {
 120         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 121
 122         tpo_td043->hmirror = enable;
 123         return tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
 124                         tpo_td043->vmirror);
 125 }
 126
 127 static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
 128 {
 129         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 130
 131         return tpo_td043->hmirror;
 132 }
 133
 134 static ssize_t tpo_td043_vmirror_show(struct device *dev,
 135         struct device_attribute *attr, char *buf)
 136 {
 137         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 138
 139         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->vmirror);
 140 }
 141
 142 static ssize_t tpo_td043_vmirror_store(struct device *dev,
 143         struct device_attribute *attr, const char *buf, size_t count)
 144 {
 145         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 146         long val;
 147         int ret;
 148
 149         ret = strict_strtol(buf, 0, &val);
 150         if (ret < 0)
 151                 return ret;
 152
 153         ret = tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, val);
 154         if (ret < 0)
 155                 return ret;
 156
 157         tpo_td043->vmirror = val;
 158
 159         return count;
 160 }
 161
 162 static ssize_t tpo_td043_mode_show(struct device *dev,
 163         struct device_attribute *attr, char *buf)
 164 {
 165         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 166
 167         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->mode);
 168 }
 169
 170 static ssize_t tpo_td043_mode_store(struct device *dev,
 171         struct device_attribute *attr, const char *buf, size_t count)
 172 {
 173         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 174         long val;
 175         int ret;
 176
 177         ret = strict_strtol(buf, 0, &val);
 178         if (ret != 0 || val & ~7)
 179                 return -EINVAL;
 180
 181         tpo_td043->mode = val;
 182
 183         val |= TPO_R02_NCLK_RISING;
 184         tpo_td043_write(tpo_td043->spi, 2, val);
 185
 186         return count;
 187 }
 188
 189 static ssize_t tpo_td043_gamma_show(struct device *dev,
 190         struct device_attribute *attr, char *buf)
 191 {
 192         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 193         ssize_t len = 0;
 194         int ret;
 195         int i;
 196
 197         for (i = 0; i < ARRAY_SIZE(tpo_td043->gamma); i++) {
 198                 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
 199                                 tpo_td043->gamma[i]);
 200                 if (ret < 0)
 201                         return ret;
 202                 len += ret;
 203         }
 204         buf[len - 1] = '\n';
 205
 206         return len;
 207 }
 208
 209 static ssize_t tpo_td043_gamma_store(struct device *dev,
 210         struct device_attribute *attr, const char *buf, size_t count)
 211 {
 212         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
 213         unsigned int g[12];
 214         int ret;
 215         int i;
 216
 217         ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
 218                         &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
 219                         &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
 220
 221         if (ret != 12)
 222                 return -EINVAL;
 223
 224         for (i = 0; i < 12; i++)
 225                 tpo_td043->gamma[i] = g[i];
 226
 227         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
 228
 229         return count;
 230 }
 231
 232 static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
 233                 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
 234 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 235                 tpo_td043_mode_show, tpo_td043_mode_store);
 236 static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
 237                 tpo_td043_gamma_show, tpo_td043_gamma_store);
 238
 239 static struct attribute *tpo_td043_attrs[] = {
 240         &dev_attr_vmirror.attr,
 241         &dev_attr_mode.attr,
 242         &dev_attr_gamma.attr,
 243         NULL,
 244 };
 245
 246 static struct attribute_group tpo_td043_attr_group = {
 247         .attrs = tpo_td043_attrs,
 248 };
 249
 250 static const struct omap_video_timings tpo_td043_timings = {
 251         .x_res          = 800,
 252         .y_res          = 480,
 253
 254         .pixel_clock    = 36000,
 255
 256         .hsw            = 1,
 257         .hfp            = 68,
 258         .hbp            = 214,
 259
 260         .vsw            = 1,
 261         .vfp            = 39,
 262         .vbp            = 34,
 263 };
 264
 265 static int tpo_td043_power_on(struct omap_dss_device *dssdev)
 266 {
 267         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 268         int nreset_gpio = dssdev->reset_gpio;
 269         int r;
 270
 271         r = omapdss_dpi_display_enable(dssdev);
 272         if (r)
 273                 goto err0;
 274
 275         if (dssdev->platform_enable) {
 276                 r = dssdev->platform_enable(dssdev);
 277                 if (r)
 278                         goto err1;
 279         }
 280
 281         regulator_enable(tpo_td043->vcc_reg);
 282
 283         /* wait for power up */
 284         msleep(160);
 285
 286         if (gpio_is_valid(nreset_gpio))
 287                 gpio_set_value(nreset_gpio, 1);
 288
 289         tpo_td043_write(tpo_td043->spi, 2,
 290                         TPO_R02_MODE(tpo_td043->mode) | TPO_R02_NCLK_RISING);
 291         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_NORMAL);
 292         tpo_td043_write(tpo_td043->spi, 0x20, 0xf0);
 293         tpo_td043_write(tpo_td043->spi, 0x21, 0xf0);
 294         tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
 295                         tpo_td043->vmirror);
 296         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
 297
 298         return 0;
 299 err1:
 300         omapdss_dpi_display_disable(dssdev);
 301 err0:
 302         return r;
 303 }
 304
 305 static void tpo_td043_power_off(struct omap_dss_device *dssdev)
 306 {
 307         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 308         int nreset_gpio = dssdev->reset_gpio;
 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         if (dssdev->platform_disable)
 324                 dssdev->platform_disable(dssdev);
 325
 326         omapdss_dpi_display_disable(dssdev);
 327 }
 328
 329 static int tpo_td043_enable(struct omap_dss_device *dssdev)
 330 {
 331         int ret;
 332
 333         dev_dbg(&dssdev->dev, "enable\n");
 334
 335         ret = tpo_td043_power_on(dssdev);
 336         if (ret)
 337                 return ret;
 338
 339         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 340
 341         return 0;
 342 }
 343
 344 static void tpo_td043_disable(struct omap_dss_device *dssdev)
 345 {
 346         dev_dbg(&dssdev->dev, "disable\n");
 347
 348         tpo_td043_power_off(dssdev);
 349
 350         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 351 }
 352
 353 static int tpo_td043_suspend(struct omap_dss_device *dssdev)
 354 {
 355         tpo_td043_power_off(dssdev);
 356         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
 357         return 0;
 358 }
 359
 360 static int tpo_td043_resume(struct omap_dss_device *dssdev)
 361 {
 362         int r = 0;
 363
 364         r = tpo_td043_power_on(dssdev);
 365         if (r)
 366                 return r;
 367
 368         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 369
 370         return 0;
 371 }
 372
 373 static int tpo_td043_probe(struct omap_dss_device *dssdev)
 374 {
 375         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 376         int nreset_gpio = dssdev->reset_gpio;
 377         int ret = 0;
 378
 379         dev_dbg(&dssdev->dev, "probe\n");
 380
 381         if (tpo_td043 == NULL) {
 382                 dev_err(&dssdev->dev, "missing tpo_td043_device\n");
 383                 return -ENODEV;
 384         }
 385
 386         dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IHS |
 387                                 OMAP_DSS_LCD_IVS | OMAP_DSS_LCD_IPC;
 388         dssdev->panel.timings = tpo_td043_timings;
 389         dssdev->ctrl.pixel_size = 24;
 390
 391         tpo_td043->mode = TPO_R02_MODE_800x480;
 392         memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma));
 393
 394         tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc");
 395         if (IS_ERR(tpo_td043->vcc_reg)) {
 396                 dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n");
 397                 ret = PTR_ERR(tpo_td043->vcc_reg);
 398                 goto fail_regulator;
 399         }
 400
 401         if (gpio_is_valid(nreset_gpio)) {
 402                 ret = gpio_request(nreset_gpio, "lcd reset");
 403                 if (ret < 0) {
 404                         dev_err(&dssdev->dev, "couldn't request reset GPIO\n");
 405                         goto fail_gpio_req;
 406                 }
 407
 408                 ret = gpio_direction_output(nreset_gpio, 0);
 409                 if (ret < 0) {
 410                         dev_err(&dssdev->dev, "couldn't set GPIO direction\n");
 411                         goto fail_gpio_direction;
 412                 }
 413         }
 414
 415         ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 416         if (ret)
 417                 dev_warn(&dssdev->dev, "failed to create sysfs files\n");
 418
 419         return 0;
 420
 421 fail_gpio_direction:
 422         gpio_free(nreset_gpio);
 423 fail_gpio_req:
 424         regulator_put(tpo_td043->vcc_reg);
 425 fail_regulator:
 426         kfree(tpo_td043);
 427         return ret;
 428 }
 429
 430 static void tpo_td043_remove(struct omap_dss_device *dssdev)
 431 {
 432         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
 433         int nreset_gpio = dssdev->reset_gpio;
 434
 435         dev_dbg(&dssdev->dev, "remove\n");
 436
 437         sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
 438         regulator_put(tpo_td043->vcc_reg);
 439         if (gpio_is_valid(nreset_gpio))
 440                 gpio_free(nreset_gpio);
 441 }
 442
 443 static struct omap_dss_driver tpo_td043_driver = {
 444         .probe          = tpo_td043_probe,
 445         .remove         = tpo_td043_remove,
 446
 447         .enable         = tpo_td043_enable,
 448         .disable        = tpo_td043_disable,
 449         .suspend        = tpo_td043_suspend,
 450         .resume         = tpo_td043_resume,
 451         .set_mirror     = tpo_td043_set_hmirror,
 452         .get_mirror     = tpo_td043_get_hmirror,
 453
 454         .driver         = {
 455                 .name   = "tpo_td043mtea1_panel",
 456                 .owner  = THIS_MODULE,
 457         },
 458 };
 459
 460 static int tpo_td043_spi_probe(struct spi_device *spi)
 461 {
 462         struct omap_dss_device *dssdev = spi->dev.platform_data;
 463         struct tpo_td043_device *tpo_td043;
 464         int ret;
 465
 466         if (dssdev == NULL) {
 467                 dev_err(&spi->dev, "missing dssdev\n");
 468                 return -ENODEV;
 469         }
 470
 471         spi->bits_per_word = 16;
 472         spi->mode = SPI_MODE_0;
 473
 474         ret = spi_setup(spi);
 475         if (ret < 0) {
 476                 dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
 477                 return ret;
 478         }
 479
 480         tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL);
 481         if (tpo_td043 == NULL)
 482                 return -ENOMEM;
 483
 484         tpo_td043->spi = spi;
 485         dev_set_drvdata(&spi->dev, tpo_td043);
 486         dev_set_drvdata(&dssdev->dev, tpo_td043);
 487
 488         omap_dss_register_driver(&tpo_td043_driver);
 489
 490         return 0;
 491 }
 492
 493 static int __devexit tpo_td043_spi_remove(struct spi_device *spi)
 494 {
 495         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev);
 496
 497         omap_dss_unregister_driver(&tpo_td043_driver);
 498         kfree(tpo_td043);
 499
 500         return 0;
 501 }
 502
 503 static struct spi_driver tpo_td043_spi_driver = {
 504         .driver = {
 505                 .name   = "tpo_td043mtea1_panel_spi",
 506                 .bus    = &spi_bus_type,
 507                 .owner  = THIS_MODULE,
 508         },
 509         .probe  = tpo_td043_spi_probe,
 510         .remove = __devexit_p(tpo_td043_spi_remove),
 511 };
 512
 513 static int __init tpo_td043_init(void)
 514 {
 515         return spi_register_driver(&tpo_td043_spi_driver);
 516 }
 517
 518 static void __exit tpo_td043_exit(void)
 519 {
 520         spi_unregister_driver(&tpo_td043_spi_driver);
 521 }
 522
 523 module_init(tpo_td043_init);
 524 module_exit(tpo_td043_exit);
 525
 526 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
 527 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
 528 MODULE_LICENSE("GPL");