drivers/video/fbdev/omap2/omapfb/displays/panel-tpo-td043mtea1.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * TPO TD043MTEA1 Panel driver
   4  *
   5  * Author: Gražvydas Ignotas <notasas@gmail.com>
   6  * Converted to new DSS device model: Tomi Valkeinen <tomi.valkeinen@ti.com>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/delay.h>
  11 #include <linux/spi/spi.h>
  12 #include <linux/regulator/consumer.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/err.h>
  15 #include <linux/slab.h>
  16
  17 #include <video/omapfb_dss.h>
  18
  19 #define TPO_R02_MODE(x)         ((x) & 7)
  20 #define TPO_R02_MODE_800x480    7
  21 #define TPO_R02_NCLK_RISING     BIT(3)
  22 #define TPO_R02_HSYNC_HIGH      BIT(4)
  23 #define TPO_R02_VSYNC_HIGH      BIT(5)
  24
  25 #define TPO_R03_NSTANDBY        BIT(0)
  26 #define TPO_R03_EN_CP_CLK       BIT(1)
  27 #define TPO_R03_EN_VGL_PUMP     BIT(2)
  28 #define TPO_R03_EN_PWM          BIT(3)
  29 #define TPO_R03_DRIVING_CAP_100 BIT(4)
  30 #define TPO_R03_EN_PRE_CHARGE   BIT(6)
  31 #define TPO_R03_SOFTWARE_CTL    BIT(7)
  32
  33 #define TPO_R04_NFLIP_H         BIT(0)
  34 #define TPO_R04_NFLIP_V         BIT(1)
  35 #define TPO_R04_CP_CLK_FREQ_1H  BIT(2)
  36 #define TPO_R04_VGL_FREQ_1H     BIT(4)
  37
  38 #define TPO_R03_VAL_NORMAL (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | \
  39                         TPO_R03_EN_VGL_PUMP |  TPO_R03_EN_PWM | \
  40                         TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
  41                         TPO_R03_SOFTWARE_CTL)
  42
  43 #define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
  44                         TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
  45
  46 static const u16 tpo_td043_def_gamma[12] = {
  47         105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
  48 };
  49
  50 struct panel_drv_data {
  51         struct omap_dss_device  dssdev;
  52         struct omap_dss_device *in;
  53
  54         struct omap_video_timings videomode;
  55
  56         int data_lines;
  57
  58         struct spi_device *spi;
  59         struct regulator *vcc_reg;
  60         struct gpio_desc *reset_gpio;
  61         u16 gamma[12];
  62         u32 mode;
  63         u32 hmirror:1;
  64         u32 vmirror:1;
  65         u32 powered_on:1;
  66         u32 spi_suspended:1;
  67         u32 power_on_resume:1;
  68 };
  69
  70 static const struct omap_video_timings tpo_td043_timings = {
  71         .x_res          = 800,
  72         .y_res          = 480,
  73
  74         .pixelclock     = 36000000,
  75
  76         .hsw            = 1,
  77         .hfp            = 68,
  78         .hbp            = 214,
  79
  80         .vsw            = 1,
  81         .vfp            = 39,
  82         .vbp            = 34,
  83
  84         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  85         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  86         .data_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
  87         .de_level       = OMAPDSS_SIG_ACTIVE_HIGH,
  88         .sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
  89 };
  90
  91 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  92
  93 static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
  94 {
  95         struct spi_message      m;
  96         struct spi_transfer     xfer;
  97         u16                     w;
  98         int                     r;
  99
 100         spi_message_init(&m);
 101
 102         memset(&xfer, 0, sizeof(xfer));
 103
 104         w = ((u16)addr << 10) | (1 << 8) | data;
 105         xfer.tx_buf = &w;
 106         xfer.bits_per_word = 16;
 107         xfer.len = 2;
 108         spi_message_add_tail(&xfer, &m);
 109
 110         r = spi_sync(spi, &m);
 111         if (r < 0)
 112                 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
 113         return r;
 114 }
 115
 116 static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
 117 {
 118         u8 i, val;
 119
 120         /* gamma bits [9:8] */
 121         for (val = i = 0; i < 4; i++)
 122                 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
 123         tpo_td043_write(spi, 0x11, val);
 124
 125         for (val = i = 0; i < 4; i++)
 126                 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
 127         tpo_td043_write(spi, 0x12, val);
 128
 129         for (val = i = 0; i < 4; i++)
 130                 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
 131         tpo_td043_write(spi, 0x13, val);
 132
 133         /* gamma bits [7:0] */
 134         for (val = i = 0; i < 12; i++)
 135                 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
 136 }
 137
 138 static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
 139 {
 140         u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V |
 141                 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
 142         if (h)
 143                 reg4 &= ~TPO_R04_NFLIP_H;
 144         if (v)
 145                 reg4 &= ~TPO_R04_NFLIP_V;
 146
 147         return tpo_td043_write(spi, 4, reg4);
 148 }
 149
 150 static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
 151 {
 152         struct panel_drv_data *ddata = dev_get_drvdata(dssdev->dev);
 153
 154         ddata->hmirror = enable;
 155         return tpo_td043_write_mirror(ddata->spi, ddata->hmirror,
 156                         ddata->vmirror);
 157 }
 158
 159 static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
 160 {
 161         struct panel_drv_data *ddata = dev_get_drvdata(dssdev->dev);
 162
 163         return ddata->hmirror;
 164 }
 165
 166 static ssize_t tpo_td043_vmirror_show(struct device *dev,
 167         struct device_attribute *attr, char *buf)
 168 {
 169         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 170
 171         return sysfs_emit(buf, "%d\n", ddata->vmirror);
 172 }
 173
 174 static ssize_t tpo_td043_vmirror_store(struct device *dev,
 175         struct device_attribute *attr, const char *buf, size_t count)
 176 {
 177         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 178         int val;
 179         int ret;
 180
 181         ret = kstrtoint(buf, 0, &val);
 182         if (ret < 0)
 183                 return ret;
 184
 185         val = !!val;
 186
 187         ret = tpo_td043_write_mirror(ddata->spi, ddata->hmirror, val);
 188         if (ret < 0)
 189                 return ret;
 190
 191         ddata->vmirror = val;
 192
 193         return count;
 194 }
 195
 196 static ssize_t tpo_td043_mode_show(struct device *dev,
 197         struct device_attribute *attr, char *buf)
 198 {
 199         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 200
 201         return sysfs_emit(buf, "%d\n", ddata->mode);
 202 }
 203
 204 static ssize_t tpo_td043_mode_store(struct device *dev,
 205         struct device_attribute *attr, const char *buf, size_t count)
 206 {
 207         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 208         long val;
 209         int ret;
 210
 211         ret = kstrtol(buf, 0, &val);
 212         if (ret != 0 || val & ~7)
 213                 return -EINVAL;
 214
 215         ddata->mode = val;
 216
 217         val |= TPO_R02_NCLK_RISING;
 218         tpo_td043_write(ddata->spi, 2, val);
 219
 220         return count;
 221 }
 222
 223 static ssize_t tpo_td043_gamma_show(struct device *dev,
 224         struct device_attribute *attr, char *buf)
 225 {
 226         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 227         ssize_t len = 0;
 228         int ret;
 229         int i;
 230
 231         for (i = 0; i < ARRAY_SIZE(ddata->gamma); i++) {
 232                 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
 233                                 ddata->gamma[i]);
 234                 if (ret < 0)
 235                         return ret;
 236                 len += ret;
 237         }
 238         buf[len - 1] = '\n';
 239
 240         return len;
 241 }
 242
 243 static ssize_t tpo_td043_gamma_store(struct device *dev,
 244         struct device_attribute *attr, const char *buf, size_t count)
 245 {
 246         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 247         unsigned int g[12];
 248         int ret;
 249         int i;
 250
 251         ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
 252                         &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
 253                         &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
 254
 255         if (ret != 12)
 256                 return -EINVAL;
 257
 258         for (i = 0; i < 12; i++)
 259                 ddata->gamma[i] = g[i];
 260
 261         tpo_td043_write_gamma(ddata->spi, ddata->gamma);
 262
 263         return count;
 264 }
 265
 266 static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
 267                 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
 268 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 269                 tpo_td043_mode_show, tpo_td043_mode_store);
 270 static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
 271                 tpo_td043_gamma_show, tpo_td043_gamma_store);
 272
 273 static struct attribute *tpo_td043_attrs[] = {
 274         &dev_attr_vmirror.attr,
 275         &dev_attr_mode.attr,
 276         &dev_attr_gamma.attr,
 277         NULL,
 278 };
 279
 280 static const struct attribute_group tpo_td043_attr_group = {
 281         .attrs = tpo_td043_attrs,
 282 };
 283
 284 static int tpo_td043_power_on(struct panel_drv_data *ddata)
 285 {
 286         int r;
 287
 288         if (ddata->powered_on)
 289                 return 0;
 290
 291         r = regulator_enable(ddata->vcc_reg);
 292         if (r != 0)
 293                 return r;
 294
 295         /* wait for panel to stabilize */
 296         msleep(160);
 297
 298         gpiod_set_value_cansleep(ddata->reset_gpio, 0);
 299
 300         tpo_td043_write(ddata->spi, 2,
 301                         TPO_R02_MODE(ddata->mode) | TPO_R02_NCLK_RISING);
 302         tpo_td043_write(ddata->spi, 3, TPO_R03_VAL_NORMAL);
 303         tpo_td043_write(ddata->spi, 0x20, 0xf0);
 304         tpo_td043_write(ddata->spi, 0x21, 0xf0);
 305         tpo_td043_write_mirror(ddata->spi, ddata->hmirror,
 306                         ddata->vmirror);
 307         tpo_td043_write_gamma(ddata->spi, ddata->gamma);
 308
 309         ddata->powered_on = 1;
 310         return 0;
 311 }
 312
 313 static void tpo_td043_power_off(struct panel_drv_data *ddata)
 314 {
 315         if (!ddata->powered_on)
 316                 return;
 317
 318         tpo_td043_write(ddata->spi, 3,
 319                         TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
 320
 321         gpiod_set_value_cansleep(ddata->reset_gpio, 1);
 322
 323         /* wait for at least 2 vsyncs before cutting off power */
 324         msleep(50);
 325
 326         tpo_td043_write(ddata->spi, 3, TPO_R03_VAL_STANDBY);
 327
 328         regulator_disable(ddata->vcc_reg);
 329
 330         ddata->powered_on = 0;
 331 }
 332
 333 static int tpo_td043_connect(struct omap_dss_device *dssdev)
 334 {
 335         struct panel_drv_data *ddata = to_panel_data(dssdev);
 336         struct omap_dss_device *in = ddata->in;
 337
 338         if (omapdss_device_is_connected(dssdev))
 339                 return 0;
 340
 341         return in->ops.dpi->connect(in, dssdev);
 342 }
 343
 344 static void tpo_td043_disconnect(struct omap_dss_device *dssdev)
 345 {
 346         struct panel_drv_data *ddata = to_panel_data(dssdev);
 347         struct omap_dss_device *in = ddata->in;
 348
 349         if (!omapdss_device_is_connected(dssdev))
 350                 return;
 351
 352         in->ops.dpi->disconnect(in, dssdev);
 353 }
 354
 355 static int tpo_td043_enable(struct omap_dss_device *dssdev)
 356 {
 357         struct panel_drv_data *ddata = to_panel_data(dssdev);
 358         struct omap_dss_device *in = ddata->in;
 359         int r;
 360
 361         if (!omapdss_device_is_connected(dssdev))
 362                 return -ENODEV;
 363
 364         if (omapdss_device_is_enabled(dssdev))
 365                 return 0;
 366
 367         if (ddata->data_lines)
 368                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
 369         in->ops.dpi->set_timings(in, &ddata->videomode);
 370
 371         r = in->ops.dpi->enable(in);
 372         if (r)
 373                 return r;
 374
 375         /*
 376          * If we are resuming from system suspend, SPI clocks might not be
 377          * enabled yet, so we'll program the LCD from SPI PM resume callback.
 378          */
 379         if (!ddata->spi_suspended) {
 380                 r = tpo_td043_power_on(ddata);
 381                 if (r) {
 382                         in->ops.dpi->disable(in);
 383                         return r;
 384                 }
 385         }
 386
 387         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 388
 389         return 0;
 390 }
 391
 392 static void tpo_td043_disable(struct omap_dss_device *dssdev)
 393 {
 394         struct panel_drv_data *ddata = to_panel_data(dssdev);
 395         struct omap_dss_device *in = ddata->in;
 396
 397         if (!omapdss_device_is_enabled(dssdev))
 398                 return;
 399
 400         in->ops.dpi->disable(in);
 401
 402         if (!ddata->spi_suspended)
 403                 tpo_td043_power_off(ddata);
 404
 405         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 406 }
 407
 408 static void tpo_td043_set_timings(struct omap_dss_device *dssdev,
 409                 struct omap_video_timings *timings)
 410 {
 411         struct panel_drv_data *ddata = to_panel_data(dssdev);
 412         struct omap_dss_device *in = ddata->in;
 413
 414         ddata->videomode = *timings;
 415         dssdev->panel.timings = *timings;
 416
 417         in->ops.dpi->set_timings(in, timings);
 418 }
 419
 420 static void tpo_td043_get_timings(struct omap_dss_device *dssdev,
 421                 struct omap_video_timings *timings)
 422 {
 423         struct panel_drv_data *ddata = to_panel_data(dssdev);
 424
 425         *timings = ddata->videomode;
 426 }
 427
 428 static int tpo_td043_check_timings(struct omap_dss_device *dssdev,
 429                 struct omap_video_timings *timings)
 430 {
 431         struct panel_drv_data *ddata = to_panel_data(dssdev);
 432         struct omap_dss_device *in = ddata->in;
 433
 434         return in->ops.dpi->check_timings(in, timings);
 435 }
 436
 437 static struct omap_dss_driver tpo_td043_ops = {
 438         .connect        = tpo_td043_connect,
 439         .disconnect     = tpo_td043_disconnect,
 440
 441         .enable         = tpo_td043_enable,
 442         .disable        = tpo_td043_disable,
 443
 444         .set_timings    = tpo_td043_set_timings,
 445         .get_timings    = tpo_td043_get_timings,
 446         .check_timings  = tpo_td043_check_timings,
 447
 448         .set_mirror     = tpo_td043_set_hmirror,
 449         .get_mirror     = tpo_td043_get_hmirror,
 450
 451         .get_resolution = omapdss_default_get_resolution,
 452 };
 453
 454 static int tpo_td043_probe(struct spi_device *spi)
 455 {
 456         struct panel_drv_data *ddata;
 457         struct omap_dss_device *dssdev;
 458         int r;
 459
 460         dev_dbg(&spi->dev, "%s\n", __func__);
 461
 462         if (!spi->dev.of_node)
 463                 return -ENODEV;
 464
 465         spi->bits_per_word = 16;
 466         spi->mode = SPI_MODE_0;
 467
 468         r = spi_setup(spi);
 469         if (r < 0) {
 470                 dev_err(&spi->dev, "spi_setup failed: %d\n", r);
 471                 return r;
 472         }
 473
 474         ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
 475         if (ddata == NULL)
 476                 return -ENOMEM;
 477
 478         dev_set_drvdata(&spi->dev, ddata);
 479
 480         ddata->spi = spi;
 481
 482         ddata->in = omapdss_of_find_source_for_first_ep(spi->dev.of_node);
 483         r = PTR_ERR_OR_ZERO(ddata->in);
 484         if (r) {
 485                 dev_err(&spi->dev, "failed to find video source: %d\n", r);
 486                 return r;
 487         }
 488
 489         ddata->mode = TPO_R02_MODE_800x480;
 490         memcpy(ddata->gamma, tpo_td043_def_gamma, sizeof(ddata->gamma));
 491
 492         ddata->vcc_reg = devm_regulator_get(&spi->dev, "vcc");
 493         if (IS_ERR(ddata->vcc_reg)) {
 494                 r = dev_err_probe(&spi->dev, r, "failed to get LCD VCC regulator\n");
 495                 goto err_regulator;
 496         }
 497
 498         ddata->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
 499         r = PTR_ERR_OR_ZERO(ddata->reset_gpio);
 500         if (r) {
 501                 dev_err(&spi->dev, "couldn't request reset GPIO\n");
 502                 goto err_gpio_req;
 503         }
 504
 505         gpiod_set_consumer_name(ddata->reset_gpio, "lcd reset");
 506
 507         r = sysfs_create_group(&spi->dev.kobj, &tpo_td043_attr_group);
 508         if (r) {
 509                 dev_err(&spi->dev, "failed to create sysfs files\n");
 510                 goto err_sysfs;
 511         }
 512
 513         ddata->videomode = tpo_td043_timings;
 514
 515         dssdev = &ddata->dssdev;
 516         dssdev->dev = &spi->dev;
 517         dssdev->driver = &tpo_td043_ops;
 518         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 519         dssdev->owner = THIS_MODULE;
 520         dssdev->panel.timings = ddata->videomode;
 521
 522         r = omapdss_register_display(dssdev);
 523         if (r) {
 524                 dev_err(&spi->dev, "Failed to register panel\n");
 525                 goto err_reg;
 526         }
 527
 528         return 0;
 529
 530 err_reg:
 531         sysfs_remove_group(&spi->dev.kobj, &tpo_td043_attr_group);
 532 err_sysfs:
 533 err_gpio_req:
 534 err_regulator:
 535         omap_dss_put_device(ddata->in);
 536         return r;
 537 }
 538
 539 static void tpo_td043_remove(struct spi_device *spi)
 540 {
 541         struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 542         struct omap_dss_device *dssdev = &ddata->dssdev;
 543         struct omap_dss_device *in = ddata->in;
 544
 545         dev_dbg(&ddata->spi->dev, "%s\n", __func__);
 546
 547         omapdss_unregister_display(dssdev);
 548
 549         tpo_td043_disable(dssdev);
 550         tpo_td043_disconnect(dssdev);
 551
 552         omap_dss_put_device(in);
 553
 554         sysfs_remove_group(&spi->dev.kobj, &tpo_td043_attr_group);
 555 }
 556
 557 #ifdef CONFIG_PM_SLEEP
 558 static int tpo_td043_spi_suspend(struct device *dev)
 559 {
 560         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 561
 562         dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", ddata);
 563
 564         ddata->power_on_resume = ddata->powered_on;
 565         tpo_td043_power_off(ddata);
 566         ddata->spi_suspended = 1;
 567
 568         return 0;
 569 }
 570
 571 static int tpo_td043_spi_resume(struct device *dev)
 572 {
 573         struct panel_drv_data *ddata = dev_get_drvdata(dev);
 574         int ret;
 575
 576         dev_dbg(dev, "tpo_td043_spi_resume\n");
 577
 578         if (ddata->power_on_resume) {
 579                 ret = tpo_td043_power_on(ddata);
 580                 if (ret)
 581                         return ret;
 582         }
 583         ddata->spi_suspended = 0;
 584
 585         return 0;
 586 }
 587 #endif
 588
 589 static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm,
 590         tpo_td043_spi_suspend, tpo_td043_spi_resume);
 591
 592 static const struct of_device_id tpo_td043_of_match[] = {
 593         { .compatible = "omapdss,tpo,td043mtea1", },
 594         {},
 595 };
 596
 597 MODULE_DEVICE_TABLE(of, tpo_td043_of_match);
 598
 599 static struct spi_driver tpo_td043_spi_driver = {
 600         .driver = {
 601                 .name   = "panel-tpo-td043mtea1",
 602                 .pm     = &tpo_td043_spi_pm,
 603                 .of_match_table = tpo_td043_of_match,
 604                 .suppress_bind_attrs = true,
 605         },
 606         .probe  = tpo_td043_probe,
 607         .remove = tpo_td043_remove,
 608 };
 609
 610 module_spi_driver(tpo_td043_spi_driver);
 611
 612 MODULE_ALIAS("spi:tpo,td043mtea1");
 613 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
 614 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
 615 MODULE_LICENSE("GPL");