drivers/video/omap2/displays-new/panel-tpo-td043mtea1.c

   1 /*
   2  * TPO TD043MTEA1 Panel driver
   3  *
   4  * Author: Gražvydas Ignotas <notasas@gmail.com>
   5  * Converted to new DSS device model: Tomi Valkeinen <tomi.valkeinen@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/delay.h>
  15 #include <linux/spi/spi.h>
  16 #include <linux/regulator/consumer.h>
  17 #include <linux/gpio.h>
  18 #include <linux/err.h>
  19 #include <linux/slab.h>
  20
  21 #include <video/omapdss.h>
  22 #include <video/omap-panel-data.h>
  23
  24 #define TPO_R02_MODE(x)         ((x) & 7)
  25 #define TPO_R02_MODE_800x480    7
  26 #define TPO_R02_NCLK_RISING     BIT(3)
  27 #define TPO_R02_HSYNC_HIGH      BIT(4)
  28 #define TPO_R02_VSYNC_HIGH      BIT(5)
  29
  30 #define TPO_R03_NSTANDBY        BIT(0)
  31 #define TPO_R03_EN_CP_CLK       BIT(1)
  32 #define TPO_R03_EN_VGL_PUMP     BIT(2)
  33 #define TPO_R03_EN_PWM          BIT(3)
  34 #define TPO_R03_DRIVING_CAP_100 BIT(4)
  35 #define TPO_R03_EN_PRE_CHARGE   BIT(6)
  36 #define TPO_R03_SOFTWARE_CTL    BIT(7)
  37
  38 #define TPO_R04_NFLIP_H         BIT(0)
  39 #define TPO_R04_NFLIP_V         BIT(1)
  40 #define TPO_R04_CP_CLK_FREQ_1H  BIT(2)
  41 #define TPO_R04_VGL_FREQ_1H     BIT(4)
  42
  43 #define TPO_R03_VAL_NORMAL (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | \
  44                         TPO_R03_EN_VGL_PUMP |  TPO_R03_EN_PWM | \
  45                         TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
  46                         TPO_R03_SOFTWARE_CTL)
  47
  48 #define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
  49                         TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
  50
  51 static const u16 tpo_td043_def_gamma[12] = {
  52         105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
  53 };
  54
  55 struct panel_drv_data {
  56         struct omap_dss_device  dssdev;
  57         struct omap_dss_device *in;
  58
  59         struct omap_video_timings videomode;
  60
  61         int data_lines;
  62
  63         struct spi_device *spi;
  64         struct regulator *vcc_reg;
  65         int nreset_gpio;
  66         u16 gamma[12];
  67         u32 mode;
  68         u32 hmirror:1;
  69         u32 vmirror:1;
  70         u32 powered_on:1;
  71         u32 spi_suspended:1;
  72         u32 power_on_resume:1;
  73 };
  74
  75 static const struct omap_video_timings tpo_td043_timings = {
  76         .x_res          = 800,
  77         .y_res          = 480,
  78
  79         .pixelclock     = 36000000,
  80
  81         .hsw            = 1,
  82         .hfp            = 68,
  83         .hbp            = 214,
  84
  85         .vsw            = 1,
  86         .vfp            = 39,
  87         .vbp            = 34,
  88
  89         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  90         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  91         .data_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
  92         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
  93         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
  94 };
  95
  96 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  97
  98 static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
  99 {
 100         struct spi_message      m;
 101         struct spi_transfer     xfer;
 102         u16                     w;
 103         int                     r;
 104
 105         spi_message_init(&m);
 106
 107         memset(&xfer, 0, sizeof(xfer));
 108
 109         w = ((u16)addr << 10) | (1 << 8) | data;
 110         xfer.tx_buf = &w;
 111         xfer.bits_per_word = 16;
 112         xfer.len = 2;
 113         spi_message_add_tail(&xfer, &m);
 114
 115         r = spi_sync(spi, &m);
 116         if (r < 0)
 117                 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
 118         return r;
 119 }
 120
 121 static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
 122 {
 123         u8 i, val;
 124
 125         /* gamma bits [9:8] */
 126         for (val = i = 0; i < 4; i++)
 127                 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
 128         tpo_td043_write(spi, 0x11, val);
 129
 130         for (val = i = 0; i < 4; i++)
 131                 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
 132         tpo_td043_write(spi, 0x12, val);
 133
 134         for (val = i = 0; i < 4; i++)
 135                 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
 136         tpo_td043_write(spi, 0x13, val);
 137
 138         /* gamma bits [7:0] */
 139         for (val = i = 0; i < 12; i++)
 140                 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
 141 }
 142
 143 static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
 144 {
 145         u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V |
 146                 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
 147         if (h)
 148                 reg4 &= ~TPO_R04_NFLIP_H;
 149         if (v)
 150                 reg4 &= ~TPO_R04_NFLIP_V;
 151
 152         return tpo_td043_write(spi, 4, reg4);
 153 }
 154
 155 static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
 156 {
 157         struct panel_drv_data *ddata = dev_get_drvdata(dssdev->dev);
 158
 159         ddata->hmirror = enable;
 160         return tpo_td043_write_mirror(ddata->spi, ddata->hmirror,
 161                         ddata->vmirror);
 162 }
 163
 164 static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
 165 {
 166         struct panel_drv_data *ddata = dev_get_drvdata(dssdev->dev);
 167
 168         return ddata->hmirror;
 169 }
 170
 171 static ssize_t tpo_td043_vmirror_show(struct device *dev,
 172         struct device_attribute *attr, char *buf)
 173 {
 174         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 175
 176         return snprintf(buf, PAGE_SIZE, "%d\n", ddata->vmirror);
 177 }
 178
 179 static ssize_t tpo_td043_vmirror_store(struct device *dev,
 180         struct device_attribute *attr, const char *buf, size_t count)
 181 {
 182         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 183         int val;
 184         int ret;
 185
 186         ret = kstrtoint(buf, 0, &val);
 187         if (ret < 0)
 188                 return ret;
 189
 190         val = !!val;
 191
 192         ret = tpo_td043_write_mirror(ddata->spi, ddata->hmirror, val);
 193         if (ret < 0)
 194                 return ret;
 195
 196         ddata->vmirror = val;
 197
 198         return count;
 199 }
 200
 201 static ssize_t tpo_td043_mode_show(struct device *dev,
 202         struct device_attribute *attr, char *buf)
 203 {
 204         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 205
 206         return snprintf(buf, PAGE_SIZE, "%d\n", ddata->mode);
 207 }
 208
 209 static ssize_t tpo_td043_mode_store(struct device *dev,
 210         struct device_attribute *attr, const char *buf, size_t count)
 211 {
 212         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 213         long val;
 214         int ret;
 215
 216         ret = kstrtol(buf, 0, &val);
 217         if (ret != 0 || val & ~7)
 218                 return -EINVAL;
 219
 220         ddata->mode = val;
 221
 222         val |= TPO_R02_NCLK_RISING;
 223         tpo_td043_write(ddata->spi, 2, val);
 224
 225         return count;
 226 }
 227
 228 static ssize_t tpo_td043_gamma_show(struct device *dev,
 229         struct device_attribute *attr, char *buf)
 230 {
 231         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 232         ssize_t len = 0;
 233         int ret;
 234         int i;
 235
 236         for (i = 0; i < ARRAY_SIZE(ddata->gamma); i++) {
 237                 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
 238                                 ddata->gamma[i]);
 239                 if (ret < 0)
 240                         return ret;
 241                 len += ret;
 242         }
 243         buf[len - 1] = '\n';
 244
 245         return len;
 246 }
 247
 248 static ssize_t tpo_td043_gamma_store(struct device *dev,
 249         struct device_attribute *attr, const char *buf, size_t count)
 250 {
 251         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 252         unsigned int g[12];
 253         int ret;
 254         int i;
 255
 256         ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
 257                         &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
 258                         &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
 259
 260         if (ret != 12)
 261                 return -EINVAL;
 262
 263         for (i = 0; i < 12; i++)
 264                 ddata->gamma[i] = g[i];
 265
 266         tpo_td043_write_gamma(ddata->spi, ddata->gamma);
 267
 268         return count;
 269 }
 270
 271 static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
 272                 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
 273 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 274                 tpo_td043_mode_show, tpo_td043_mode_store);
 275 static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
 276                 tpo_td043_gamma_show, tpo_td043_gamma_store);
 277
 278 static struct attribute *tpo_td043_attrs[] = {
 279         &dev_attr_vmirror.attr,
 280         &dev_attr_mode.attr,
 281         &dev_attr_gamma.attr,
 282         NULL,
 283 };
 284
 285 static struct attribute_group tpo_td043_attr_group = {
 286         .attrs = tpo_td043_attrs,
 287 };
 288
 289 static int tpo_td043_power_on(struct panel_drv_data *ddata)
 290 {
 291         int r;
 292
 293         if (ddata->powered_on)
 294                 return 0;
 295
 296         r = regulator_enable(ddata->vcc_reg);
 297         if (r != 0)
 298                 return r;
 299
 300         /* wait for panel to stabilize */
 301         msleep(160);
 302
 303         if (gpio_is_valid(ddata->nreset_gpio))
 304                 gpio_set_value(ddata->nreset_gpio, 1);
 305
 306         tpo_td043_write(ddata->spi, 2,
 307                         TPO_R02_MODE(ddata->mode) | TPO_R02_NCLK_RISING);
 308         tpo_td043_write(ddata->spi, 3, TPO_R03_VAL_NORMAL);
 309         tpo_td043_write(ddata->spi, 0x20, 0xf0);
 310         tpo_td043_write(ddata->spi, 0x21, 0xf0);
 311         tpo_td043_write_mirror(ddata->spi, ddata->hmirror,
 312                         ddata->vmirror);
 313         tpo_td043_write_gamma(ddata->spi, ddata->gamma);
 314
 315         ddata->powered_on = 1;
 316         return 0;
 317 }
 318
 319 static void tpo_td043_power_off(struct panel_drv_data *ddata)
 320 {
 321         if (!ddata->powered_on)
 322                 return;
 323
 324         tpo_td043_write(ddata->spi, 3,
 325                         TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
 326
 327         if (gpio_is_valid(ddata->nreset_gpio))
 328                 gpio_set_value(ddata->nreset_gpio, 0);
 329
 330         /* wait for at least 2 vsyncs before cutting off power */
 331         msleep(50);
 332
 333         tpo_td043_write(ddata->spi, 3, TPO_R03_VAL_STANDBY);
 334
 335         regulator_disable(ddata->vcc_reg);
 336
 337         ddata->powered_on = 0;
 338 }
 339
 340 static int tpo_td043_connect(struct omap_dss_device *dssdev)
 341 {
 342         struct panel_drv_data *ddata = to_panel_data(dssdev);
 343         struct omap_dss_device *in = ddata->in;
 344         int r;
 345
 346         if (omapdss_device_is_connected(dssdev))
 347                 return 0;
 348
 349         r = in->ops.dpi->connect(in, dssdev);
 350         if (r)
 351                 return r;
 352
 353         return 0;
 354 }
 355
 356 static void tpo_td043_disconnect(struct omap_dss_device *dssdev)
 357 {
 358         struct panel_drv_data *ddata = to_panel_data(dssdev);
 359         struct omap_dss_device *in = ddata->in;
 360
 361         if (!omapdss_device_is_connected(dssdev))
 362                 return;
 363
 364         in->ops.dpi->disconnect(in, dssdev);
 365 }
 366
 367 static int tpo_td043_enable(struct omap_dss_device *dssdev)
 368 {
 369         struct panel_drv_data *ddata = to_panel_data(dssdev);
 370         struct omap_dss_device *in = ddata->in;
 371         int r;
 372
 373         if (!omapdss_device_is_connected(dssdev))
 374                 return -ENODEV;
 375
 376         if (omapdss_device_is_enabled(dssdev))
 377                 return 0;
 378
 379         in->ops.dpi->set_data_lines(in, ddata->data_lines);
 380         in->ops.dpi->set_timings(in, &ddata->videomode);
 381
 382         r = in->ops.dpi->enable(in);
 383         if (r)
 384                 return r;
 385
 386         /*
 387          * If we are resuming from system suspend, SPI clocks might not be
 388          * enabled yet, so we'll program the LCD from SPI PM resume callback.
 389          */
 390         if (!ddata->spi_suspended) {
 391                 r = tpo_td043_power_on(ddata);
 392                 if (r) {
 393                         in->ops.dpi->disable(in);
 394                         return r;
 395                 }
 396         }
 397
 398         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 399
 400         return 0;
 401 }
 402
 403 static void tpo_td043_disable(struct omap_dss_device *dssdev)
 404 {
 405         struct panel_drv_data *ddata = to_panel_data(dssdev);
 406         struct omap_dss_device *in = ddata->in;
 407
 408         if (!omapdss_device_is_enabled(dssdev))
 409                 return;
 410
 411         in->ops.dpi->disable(in);
 412
 413         if (!ddata->spi_suspended)
 414                 tpo_td043_power_off(ddata);
 415
 416         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 417 }
 418
 419 static void tpo_td043_set_timings(struct omap_dss_device *dssdev,
 420                 struct omap_video_timings *timings)
 421 {
 422         struct panel_drv_data *ddata = to_panel_data(dssdev);
 423         struct omap_dss_device *in = ddata->in;
 424
 425         ddata->videomode = *timings;
 426         dssdev->panel.timings = *timings;
 427
 428         in->ops.dpi->set_timings(in, timings);
 429 }
 430
 431 static void tpo_td043_get_timings(struct omap_dss_device *dssdev,
 432                 struct omap_video_timings *timings)
 433 {
 434         struct panel_drv_data *ddata = to_panel_data(dssdev);
 435
 436         *timings = ddata->videomode;
 437 }
 438
 439 static int tpo_td043_check_timings(struct omap_dss_device *dssdev,
 440                 struct omap_video_timings *timings)
 441 {
 442         struct panel_drv_data *ddata = to_panel_data(dssdev);
 443         struct omap_dss_device *in = ddata->in;
 444
 445         return in->ops.dpi->check_timings(in, timings);
 446 }
 447
 448 static struct omap_dss_driver tpo_td043_ops = {
 449         .connect        = tpo_td043_connect,
 450         .disconnect     = tpo_td043_disconnect,
 451
 452         .enable         = tpo_td043_enable,
 453         .disable        = tpo_td043_disable,
 454
 455         .set_timings    = tpo_td043_set_timings,
 456         .get_timings    = tpo_td043_get_timings,
 457         .check_timings  = tpo_td043_check_timings,
 458
 459         .set_mirror     = tpo_td043_set_hmirror,
 460         .get_mirror     = tpo_td043_get_hmirror,
 461
 462         .get_resolution = omapdss_default_get_resolution,
 463 };
 464
 465
 466 static int tpo_td043_probe_pdata(struct spi_device *spi)
 467 {
 468         const struct panel_tpo_td043mtea1_platform_data *pdata;
 469         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 470         struct omap_dss_device *dssdev, *in;
 471
 472         pdata = dev_get_platdata(&spi->dev);
 473
 474         ddata->nreset_gpio = pdata->nreset_gpio;
 475
 476         in = omap_dss_find_output(pdata->source);
 477         if (in == NULL) {
 478                 dev_err(&spi->dev, "failed to find video source '%s'\n",
 479                                 pdata->source);
 480                 return -EPROBE_DEFER;
 481         }
 482         ddata->in = in;
 483
 484         ddata->data_lines = pdata->data_lines;
 485
 486         dssdev = &ddata->dssdev;
 487         dssdev->name = pdata->name;
 488
 489         return 0;
 490 }
 491
 492 static int tpo_td043_probe(struct spi_device *spi)
 493 {
 494         struct panel_drv_data *ddata;
 495         struct omap_dss_device *dssdev;
 496         int r;
 497
 498         dev_dbg(&spi->dev, "%s\n", __func__);
 499
 500         spi->bits_per_word = 16;
 501         spi->mode = SPI_MODE_0;
 502
 503         r = spi_setup(spi);
 504         if (r < 0) {
 505                 dev_err(&spi->dev, "spi_setup failed: %d\n", r);
 506                 return r;
 507         }
 508
 509         ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
 510         if (ddata == NULL)
 511                 return -ENOMEM;
 512
 513         dev_set_drvdata(&spi->dev, ddata);
 514
 515         ddata->spi = spi;
 516
 517         if (dev_get_platdata(&spi->dev)) {
 518                 r = tpo_td043_probe_pdata(spi);
 519                 if (r)
 520                         return r;
 521         } else {
 522                 return -ENODEV;
 523         }
 524
 525         ddata->mode = TPO_R02_MODE_800x480;
 526         memcpy(ddata->gamma, tpo_td043_def_gamma, sizeof(ddata->gamma));
 527
 528         ddata->vcc_reg = devm_regulator_get(&spi->dev, "vcc");
 529         if (IS_ERR(ddata->vcc_reg)) {
 530                 dev_err(&spi->dev, "failed to get LCD VCC regulator\n");
 531                 r = PTR_ERR(ddata->vcc_reg);
 532                 goto err_regulator;
 533         }
 534
 535         if (gpio_is_valid(ddata->nreset_gpio)) {
 536                 r = devm_gpio_request_one(&spi->dev,
 537                                 ddata->nreset_gpio, GPIOF_OUT_INIT_LOW,
 538                                 "lcd reset");
 539                 if (r < 0) {
 540                         dev_err(&spi->dev, "couldn't request reset GPIO\n");
 541                         goto err_gpio_req;
 542                 }
 543         }
 544
 545         r = sysfs_create_group(&spi->dev.kobj, &tpo_td043_attr_group);
 546         if (r) {
 547                 dev_err(&spi->dev, "failed to create sysfs files\n");
 548                 goto err_sysfs;
 549         }
 550
 551         ddata->videomode = tpo_td043_timings;
 552
 553         dssdev = &ddata->dssdev;
 554         dssdev->dev = &spi->dev;
 555         dssdev->driver = &tpo_td043_ops;
 556         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 557         dssdev->owner = THIS_MODULE;
 558         dssdev->panel.timings = ddata->videomode;
 559
 560         r = omapdss_register_display(dssdev);
 561         if (r) {
 562                 dev_err(&spi->dev, "Failed to register panel\n");
 563                 goto err_reg;
 564         }
 565
 566         return 0;
 567
 568 err_reg:
 569         sysfs_remove_group(&spi->dev.kobj, &tpo_td043_attr_group);
 570 err_sysfs:
 571 err_gpio_req:
 572 err_regulator:
 573         omap_dss_put_device(ddata->in);
 574         return r;
 575 }
 576
 577 static int tpo_td043_remove(struct spi_device *spi)
 578 {
 579         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 580         struct omap_dss_device *dssdev = &ddata->dssdev;
 581         struct omap_dss_device *in = ddata->in;
 582
 583         dev_dbg(&ddata->spi->dev, "%s\n", __func__);
 584
 585         omapdss_unregister_display(dssdev);
 586
 587         tpo_td043_disable(dssdev);
 588         tpo_td043_disconnect(dssdev);
 589
 590         omap_dss_put_device(in);
 591
 592         sysfs_remove_group(&spi->dev.kobj, &tpo_td043_attr_group);
 593
 594         return 0;
 595 }
 596
 597 #ifdef CONFIG_PM_SLEEP
 598 static int tpo_td043_spi_suspend(struct device *dev)
 599 {
 600         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 601
 602         dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", ddata);
 603
 604         ddata->power_on_resume = ddata->powered_on;
 605         tpo_td043_power_off(ddata);
 606         ddata->spi_suspended = 1;
 607
 608         return 0;
 609 }
 610
 611 static int tpo_td043_spi_resume(struct device *dev)
 612 {
 613         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 614         int ret;
 615
 616         dev_dbg(dev, "tpo_td043_spi_resume\n");
 617
 618         if (ddata->power_on_resume) {
 619                 ret = tpo_td043_power_on(ddata);
 620                 if (ret)
 621                         return ret;
 622         }
 623         ddata->spi_suspended = 0;
 624
 625         return 0;
 626 }
 627 #endif
 628
 629 static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm,
 630         tpo_td043_spi_suspend, tpo_td043_spi_resume);
 631
 632 static struct spi_driver tpo_td043_spi_driver = {
 633         .driver = {
 634                 .name   = "panel-tpo-td043mtea1",
 635                 .owner  = THIS_MODULE,
 636                 .pm     = &tpo_td043_spi_pm,
 637         },
 638         .probe  = tpo_td043_probe,
 639         .remove = tpo_td043_remove,
 640 };
 641
 642 module_spi_driver(tpo_td043_spi_driver);
 643
 644 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
 645 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
 646 MODULE_LICENSE("GPL");