drivers/video/omap2/displays/panel-taal.c

   1 /*
   2  * Taal DSI command mode panel
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /*#define DEBUG*/
  21
  22 #include <linux/module.h>
  23 #include <linux/delay.h>
  24 #include <linux/err.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/sched.h>
  27 #include <linux/backlight.h>
  28 #include <linux/fb.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/gpio.h>
  31 #include <linux/completion.h>
  32 #include <linux/workqueue.h>
  33
  34 #include <plat/display.h>
  35
  36 /* DSI Virtual channel. Hardcoded for now. */
  37 #define TCH 0
  38
  39 #define DCS_READ_NUM_ERRORS     0x05
  40 #define DCS_READ_POWER_MODE     0x0a
  41 #define DCS_READ_MADCTL         0x0b
  42 #define DCS_READ_PIXEL_FORMAT   0x0c
  43 #define DCS_RDDSDR              0x0f
  44 #define DCS_SLEEP_IN            0x10
  45 #define DCS_SLEEP_OUT           0x11
  46 #define DCS_DISPLAY_OFF         0x28
  47 #define DCS_DISPLAY_ON          0x29
  48 #define DCS_COLUMN_ADDR         0x2a
  49 #define DCS_PAGE_ADDR           0x2b
  50 #define DCS_MEMORY_WRITE        0x2c
  51 #define DCS_TEAR_OFF            0x34
  52 #define DCS_TEAR_ON             0x35
  53 #define DCS_MEM_ACC_CTRL        0x36
  54 #define DCS_PIXEL_FORMAT        0x3a
  55 #define DCS_BRIGHTNESS          0x51
  56 #define DCS_CTRL_DISPLAY        0x53
  57 #define DCS_WRITE_CABC          0x55
  58 #define DCS_READ_CABC           0x56
  59 #define DCS_GET_ID1             0xda
  60 #define DCS_GET_ID2             0xdb
  61 #define DCS_GET_ID3             0xdc
  62
  63 /* #define TAAL_USE_ESD_CHECK */
  64 #define TAAL_ESD_CHECK_PERIOD   msecs_to_jiffies(5000)
  65
  66 struct taal_data {
  67         struct backlight_device *bldev;
  68
  69         unsigned long   hw_guard_end;   /* next value of jiffies when we can
  70                                          * issue the next sleep in/out command
  71                                          */
  72         unsigned long   hw_guard_wait;  /* max guard time in jiffies */
  73
  74         struct omap_dss_device *dssdev;
  75
  76         bool enabled;
  77         u8 rotate;
  78         bool mirror;
  79
  80         bool te_enabled;
  81         bool use_ext_te;
  82         struct completion te_completion;
  83
  84         bool use_dsi_bl;
  85
  86         bool cabc_broken;
  87         unsigned cabc_mode;
  88
  89         bool intro_printed;
  90
  91         struct workqueue_struct *esd_wq;
  92         struct delayed_work esd_work;
  93 };
  94
  95 static void taal_esd_work(struct work_struct *work);
  96
  97 static void hw_guard_start(struct taal_data *td, int guard_msec)
  98 {
  99         td->hw_guard_wait = msecs_to_jiffies(guard_msec);
 100         td->hw_guard_end = jiffies + td->hw_guard_wait;
 101 }
 102
 103 static void hw_guard_wait(struct taal_data *td)
 104 {
 105         unsigned long wait = td->hw_guard_end - jiffies;
 106
 107         if ((long)wait > 0 && wait <= td->hw_guard_wait) {
 108                 set_current_state(TASK_UNINTERRUPTIBLE);
 109                 schedule_timeout(wait);
 110         }
 111 }
 112
 113 static int taal_dcs_read_1(u8 dcs_cmd, u8 *data)
 114 {
 115         int r;
 116         u8 buf[1];
 117
 118         r = dsi_vc_dcs_read(TCH, dcs_cmd, buf, 1);
 119
 120         if (r < 0)
 121                 return r;
 122
 123         *data = buf[0];
 124
 125         return 0;
 126 }
 127
 128 static int taal_dcs_write_0(u8 dcs_cmd)
 129 {
 130         return dsi_vc_dcs_write(TCH, &dcs_cmd, 1);
 131 }
 132
 133 static int taal_dcs_write_1(u8 dcs_cmd, u8 param)
 134 {
 135         u8 buf[2];
 136         buf[0] = dcs_cmd;
 137         buf[1] = param;
 138         return dsi_vc_dcs_write(TCH, buf, 2);
 139 }
 140
 141 static int taal_sleep_in(struct taal_data *td)
 142
 143 {
 144         u8 cmd;
 145         int r;
 146
 147         hw_guard_wait(td);
 148
 149         cmd = DCS_SLEEP_IN;
 150         r = dsi_vc_dcs_write_nosync(TCH, &cmd, 1);
 151         if (r)
 152                 return r;
 153
 154         hw_guard_start(td, 120);
 155
 156         msleep(5);
 157
 158         return 0;
 159 }
 160
 161 static int taal_sleep_out(struct taal_data *td)
 162 {
 163         int r;
 164
 165         hw_guard_wait(td);
 166
 167         r = taal_dcs_write_0(DCS_SLEEP_OUT);
 168         if (r)
 169                 return r;
 170
 171         hw_guard_start(td, 120);
 172
 173         msleep(5);
 174
 175         return 0;
 176 }
 177
 178 static int taal_get_id(u8 *id1, u8 *id2, u8 *id3)
 179 {
 180         int r;
 181
 182         r = taal_dcs_read_1(DCS_GET_ID1, id1);
 183         if (r)
 184                 return r;
 185         r = taal_dcs_read_1(DCS_GET_ID2, id2);
 186         if (r)
 187                 return r;
 188         r = taal_dcs_read_1(DCS_GET_ID3, id3);
 189         if (r)
 190                 return r;
 191
 192         return 0;
 193 }
 194
 195 static int taal_set_addr_mode(u8 rotate, bool mirror)
 196 {
 197         int r;
 198         u8 mode;
 199         int b5, b6, b7;
 200
 201         r = taal_dcs_read_1(DCS_READ_MADCTL, &mode);
 202         if (r)
 203                 return r;
 204
 205         switch (rotate) {
 206         default:
 207         case 0:
 208                 b7 = 0;
 209                 b6 = 0;
 210                 b5 = 0;
 211                 break;
 212         case 1:
 213                 b7 = 0;
 214                 b6 = 1;
 215                 b5 = 1;
 216                 break;
 217         case 2:
 218                 b7 = 1;
 219                 b6 = 1;
 220                 b5 = 0;
 221                 break;
 222         case 3:
 223                 b7 = 1;
 224                 b6 = 0;
 225                 b5 = 1;
 226                 break;
 227         }
 228
 229         if (mirror)
 230                 b6 = !b6;
 231
 232         mode &= ~((1<<7) | (1<<6) | (1<<5));
 233         mode |= (b7 << 7) | (b6 << 6) | (b5 << 5);
 234
 235         return taal_dcs_write_1(DCS_MEM_ACC_CTRL, mode);
 236 }
 237
 238 static int taal_set_update_window(u16 x, u16 y, u16 w, u16 h)
 239 {
 240         int r;
 241         u16 x1 = x;
 242         u16 x2 = x + w - 1;
 243         u16 y1 = y;
 244         u16 y2 = y + h - 1;
 245
 246         u8 buf[5];
 247         buf[0] = DCS_COLUMN_ADDR;
 248         buf[1] = (x1 >> 8) & 0xff;
 249         buf[2] = (x1 >> 0) & 0xff;
 250         buf[3] = (x2 >> 8) & 0xff;
 251         buf[4] = (x2 >> 0) & 0xff;
 252
 253         r = dsi_vc_dcs_write_nosync(TCH, buf, sizeof(buf));
 254         if (r)
 255                 return r;
 256
 257         buf[0] = DCS_PAGE_ADDR;
 258         buf[1] = (y1 >> 8) & 0xff;
 259         buf[2] = (y1 >> 0) & 0xff;
 260         buf[3] = (y2 >> 8) & 0xff;
 261         buf[4] = (y2 >> 0) & 0xff;
 262
 263         r = dsi_vc_dcs_write_nosync(TCH, buf, sizeof(buf));
 264         if (r)
 265                 return r;
 266
 267         dsi_vc_send_bta_sync(TCH);
 268
 269         return r;
 270 }
 271
 272 static int taal_bl_update_status(struct backlight_device *dev)
 273 {
 274         struct omap_dss_device *dssdev = dev_get_drvdata(&dev->dev);
 275         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 276         int r;
 277         int level;
 278
 279         if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 280                         dev->props.power == FB_BLANK_UNBLANK)
 281                 level = dev->props.brightness;
 282         else
 283                 level = 0;
 284
 285         dev_dbg(&dssdev->dev, "update brightness to %d\n", level);
 286
 287         if (td->use_dsi_bl) {
 288                 if (td->enabled) {
 289                         dsi_bus_lock();
 290                         r = taal_dcs_write_1(DCS_BRIGHTNESS, level);
 291                         dsi_bus_unlock();
 292                         if (r)
 293                                 return r;
 294                 }
 295         } else {
 296                 if (!dssdev->set_backlight)
 297                         return -EINVAL;
 298
 299                 r = dssdev->set_backlight(dssdev, level);
 300                 if (r)
 301                         return r;
 302         }
 303
 304         return 0;
 305 }
 306
 307 static int taal_bl_get_intensity(struct backlight_device *dev)
 308 {
 309         if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
 310                         dev->props.power == FB_BLANK_UNBLANK)
 311                 return dev->props.brightness;
 312
 313         return 0;
 314 }
 315
 316 static struct backlight_ops taal_bl_ops = {
 317         .get_brightness = taal_bl_get_intensity,
 318         .update_status  = taal_bl_update_status,
 319 };
 320
 321 static void taal_get_timings(struct omap_dss_device *dssdev,
 322                         struct omap_video_timings *timings)
 323 {
 324         *timings = dssdev->panel.timings;
 325 }
 326
 327 static void taal_get_resolution(struct omap_dss_device *dssdev,
 328                 u16 *xres, u16 *yres)
 329 {
 330         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 331
 332         if (td->rotate == 0 || td->rotate == 2) {
 333                 *xres = dssdev->panel.timings.x_res;
 334                 *yres = dssdev->panel.timings.y_res;
 335         } else {
 336                 *yres = dssdev->panel.timings.x_res;
 337                 *xres = dssdev->panel.timings.y_res;
 338         }
 339 }
 340
 341 static irqreturn_t taal_te_isr(int irq, void *data)
 342 {
 343         struct omap_dss_device *dssdev = data;
 344         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 345
 346         complete_all(&td->te_completion);
 347
 348         return IRQ_HANDLED;
 349 }
 350
 351 static ssize_t taal_num_errors_show(struct device *dev,
 352                 struct device_attribute *attr, char *buf)
 353 {
 354         struct omap_dss_device *dssdev = to_dss_device(dev);
 355         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 356         u8 errors;
 357         int r;
 358
 359         if (td->enabled) {
 360                 dsi_bus_lock();
 361                 r = taal_dcs_read_1(DCS_READ_NUM_ERRORS, &errors);
 362                 dsi_bus_unlock();
 363         } else {
 364                 r = -ENODEV;
 365         }
 366
 367         if (r)
 368                 return r;
 369
 370         return snprintf(buf, PAGE_SIZE, "%d\n", errors);
 371 }
 372
 373 static ssize_t taal_hw_revision_show(struct device *dev,
 374                 struct device_attribute *attr, char *buf)
 375 {
 376         struct omap_dss_device *dssdev = to_dss_device(dev);
 377         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 378         u8 id1, id2, id3;
 379         int r;
 380
 381         if (td->enabled) {
 382                 dsi_bus_lock();
 383                 r = taal_get_id(&id1, &id2, &id3);
 384                 dsi_bus_unlock();
 385         } else {
 386                 r = -ENODEV;
 387         }
 388
 389         if (r)
 390                 return r;
 391
 392         return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
 393 }
 394
 395 static const char *cabc_modes[] = {
 396         "off",          /* used also always when CABC is not supported */
 397         "ui",
 398         "still-image",
 399         "moving-image",
 400 };
 401
 402 static ssize_t show_cabc_mode(struct device *dev,
 403                 struct device_attribute *attr,
 404                 char *buf)
 405 {
 406         struct omap_dss_device *dssdev = to_dss_device(dev);
 407         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 408         const char *mode_str;
 409         int mode;
 410         int len;
 411
 412         mode = td->cabc_mode;
 413
 414         mode_str = "unknown";
 415         if (mode >= 0 && mode < ARRAY_SIZE(cabc_modes))
 416                 mode_str = cabc_modes[mode];
 417         len = snprintf(buf, PAGE_SIZE, "%s\n", mode_str);
 418
 419         return len < PAGE_SIZE - 1 ? len : PAGE_SIZE - 1;
 420 }
 421
 422 static ssize_t store_cabc_mode(struct device *dev,
 423                 struct device_attribute *attr,
 424                 const char *buf, size_t count)
 425 {
 426         struct omap_dss_device *dssdev = to_dss_device(dev);
 427         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 428         int i;
 429
 430         for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) {
 431                 if (sysfs_streq(cabc_modes[i], buf))
 432                         break;
 433         }
 434
 435         if (i == ARRAY_SIZE(cabc_modes))
 436                 return -EINVAL;
 437
 438         if (td->enabled) {
 439                 dsi_bus_lock();
 440                 if (!td->cabc_broken)
 441                         taal_dcs_write_1(DCS_WRITE_CABC, i);
 442                 dsi_bus_unlock();
 443         }
 444
 445         td->cabc_mode = i;
 446
 447         return count;
 448 }
 449
 450 static ssize_t show_cabc_available_modes(struct device *dev,
 451                 struct device_attribute *attr,
 452                 char *buf)
 453 {
 454         int len;
 455         int i;
 456
 457         for (i = 0, len = 0;
 458              len < PAGE_SIZE && i < ARRAY_SIZE(cabc_modes); i++)
 459                 len += snprintf(&buf[len], PAGE_SIZE - len, "%s%s%s",
 460                         i ? " " : "", cabc_modes[i],
 461                         i == ARRAY_SIZE(cabc_modes) - 1 ? "\n" : "");
 462
 463         return len < PAGE_SIZE ? len : PAGE_SIZE - 1;
 464 }
 465
 466 static DEVICE_ATTR(num_dsi_errors, S_IRUGO, taal_num_errors_show, NULL);
 467 static DEVICE_ATTR(hw_revision, S_IRUGO, taal_hw_revision_show, NULL);
 468 static DEVICE_ATTR(cabc_mode, S_IRUGO | S_IWUSR,
 469                 show_cabc_mode, store_cabc_mode);
 470 static DEVICE_ATTR(cabc_available_modes, S_IRUGO,
 471                 show_cabc_available_modes, NULL);
 472
 473 static struct attribute *taal_attrs[] = {
 474         &dev_attr_num_dsi_errors.attr,
 475         &dev_attr_hw_revision.attr,
 476         &dev_attr_cabc_mode.attr,
 477         &dev_attr_cabc_available_modes.attr,
 478         NULL,
 479 };
 480
 481 static struct attribute_group taal_attr_group = {
 482         .attrs = taal_attrs,
 483 };
 484
 485 static int taal_probe(struct omap_dss_device *dssdev)
 486 {
 487         struct taal_data *td;
 488         struct backlight_device *bldev;
 489         int r;
 490
 491         const struct omap_video_timings taal_panel_timings = {
 492                 .x_res          = 864,
 493                 .y_res          = 480,
 494         };
 495
 496         dev_dbg(&dssdev->dev, "probe\n");
 497
 498         dssdev->panel.config = OMAP_DSS_LCD_TFT;
 499         dssdev->panel.timings = taal_panel_timings;
 500         dssdev->ctrl.pixel_size = 24;
 501
 502         td = kzalloc(sizeof(*td), GFP_KERNEL);
 503         if (!td) {
 504                 r = -ENOMEM;
 505                 goto err0;
 506         }
 507         td->dssdev = dssdev;
 508
 509         td->esd_wq = create_singlethread_workqueue("taal_esd");
 510         if (td->esd_wq == NULL) {
 511                 dev_err(&dssdev->dev, "can't create ESD workqueue\n");
 512                 r = -ENOMEM;
 513                 goto err2;
 514         }
 515         INIT_DELAYED_WORK_DEFERRABLE(&td->esd_work, taal_esd_work);
 516
 517         dev_set_drvdata(&dssdev->dev, td);
 518
 519         dssdev->get_timings = taal_get_timings;
 520         dssdev->get_resolution = taal_get_resolution;
 521
 522         /* if no platform set_backlight() defined, presume DSI backlight
 523          * control */
 524         if (!dssdev->set_backlight)
 525                 td->use_dsi_bl = true;
 526
 527         bldev = backlight_device_register("taal", &dssdev->dev, dssdev,
 528                         &taal_bl_ops);
 529         if (IS_ERR(bldev)) {
 530                 r = PTR_ERR(bldev);
 531                 goto err1;
 532         }
 533
 534         td->bldev = bldev;
 535
 536         bldev->props.fb_blank = FB_BLANK_UNBLANK;
 537         bldev->props.power = FB_BLANK_UNBLANK;
 538         if (td->use_dsi_bl) {
 539                 bldev->props.max_brightness = 255;
 540                 bldev->props.brightness = 255;
 541         } else {
 542                 bldev->props.max_brightness = 127;
 543                 bldev->props.brightness = 127;
 544         }
 545
 546         taal_bl_update_status(bldev);
 547
 548         if (dssdev->phy.dsi.ext_te) {
 549                 int gpio = dssdev->phy.dsi.ext_te_gpio;
 550
 551                 r = gpio_request(gpio, "taal irq");
 552                 if (r) {
 553                         dev_err(&dssdev->dev, "GPIO request failed\n");
 554                         goto err3;
 555                 }
 556
 557                 gpio_direction_input(gpio);
 558
 559                 r = request_irq(gpio_to_irq(gpio), taal_te_isr,
 560                                 IRQF_DISABLED | IRQF_TRIGGER_RISING,
 561                                 "taal vsync", dssdev);
 562
 563                 if (r) {
 564                         dev_err(&dssdev->dev, "IRQ request failed\n");
 565                         gpio_free(gpio);
 566                         goto err3;
 567                 }
 568
 569                 init_completion(&td->te_completion);
 570
 571                 td->use_ext_te = true;
 572         }
 573
 574         r = sysfs_create_group(&dssdev->dev.kobj, &taal_attr_group);
 575         if (r) {
 576                 dev_err(&dssdev->dev, "failed to create sysfs files\n");
 577                 goto err4;
 578         }
 579
 580         return 0;
 581 err4:
 582         if (td->use_ext_te) {
 583                 int gpio = dssdev->phy.dsi.ext_te_gpio;
 584                 free_irq(gpio_to_irq(gpio), dssdev);
 585                 gpio_free(gpio);
 586         }
 587 err3:
 588         backlight_device_unregister(bldev);
 589 err2:
 590         cancel_delayed_work_sync(&td->esd_work);
 591         destroy_workqueue(td->esd_wq);
 592 err1:
 593         kfree(td);
 594 err0:
 595         return r;
 596 }
 597
 598 static void taal_remove(struct omap_dss_device *dssdev)
 599 {
 600         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 601         struct backlight_device *bldev;
 602
 603         dev_dbg(&dssdev->dev, "remove\n");
 604
 605         sysfs_remove_group(&dssdev->dev.kobj, &taal_attr_group);
 606
 607         if (td->use_ext_te) {
 608                 int gpio = dssdev->phy.dsi.ext_te_gpio;
 609                 free_irq(gpio_to_irq(gpio), dssdev);
 610                 gpio_free(gpio);
 611         }
 612
 613         bldev = td->bldev;
 614         bldev->props.power = FB_BLANK_POWERDOWN;
 615         taal_bl_update_status(bldev);
 616         backlight_device_unregister(bldev);
 617
 618         cancel_delayed_work_sync(&td->esd_work);
 619         destroy_workqueue(td->esd_wq);
 620
 621         kfree(td);
 622 }
 623
 624 static int taal_enable(struct omap_dss_device *dssdev)
 625 {
 626         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 627         u8 id1, id2, id3;
 628         int r;
 629
 630         dev_dbg(&dssdev->dev, "enable\n");
 631
 632         if (dssdev->platform_enable) {
 633                 r = dssdev->platform_enable(dssdev);
 634                 if (r)
 635                         return r;
 636         }
 637
 638         /* it seems we have to wait a bit until taal is ready */
 639         msleep(5);
 640
 641         r = taal_sleep_out(td);
 642         if (r)
 643                 goto err;
 644
 645         r = taal_get_id(&id1, &id2, &id3);
 646         if (r)
 647                 goto err;
 648
 649         /* on early revisions CABC is broken */
 650         if (id2 == 0x00 || id2 == 0xff || id2 == 0x81)
 651                 td->cabc_broken = true;
 652
 653         taal_dcs_write_1(DCS_BRIGHTNESS, 0xff);
 654         taal_dcs_write_1(DCS_CTRL_DISPLAY, (1<<2) | (1<<5)); /* BL | BCTRL */
 655
 656         taal_dcs_write_1(DCS_PIXEL_FORMAT, 0x7); /* 24bit/pixel */
 657
 658         taal_set_addr_mode(td->rotate, td->mirror);
 659         if (!td->cabc_broken)
 660                 taal_dcs_write_1(DCS_WRITE_CABC, td->cabc_mode);
 661
 662         taal_dcs_write_0(DCS_DISPLAY_ON);
 663
 664 #ifdef TAAL_USE_ESD_CHECK
 665         queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);
 666 #endif
 667
 668         td->enabled = 1;
 669
 670         if (!td->intro_printed) {
 671                 dev_info(&dssdev->dev, "revision %02x.%02x.%02x\n",
 672                                 id1, id2, id3);
 673                 if (td->cabc_broken)
 674                         dev_info(&dssdev->dev,
 675                                         "old Taal version, CABC disabled\n");
 676                 td->intro_printed = true;
 677         }
 678
 679         return 0;
 680 err:
 681         if (dssdev->platform_disable)
 682                 dssdev->platform_disable(dssdev);
 683
 684         return r;
 685 }
 686
 687 static void taal_disable(struct omap_dss_device *dssdev)
 688 {
 689         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 690
 691         dev_dbg(&dssdev->dev, "disable\n");
 692
 693         cancel_delayed_work(&td->esd_work);
 694
 695         taal_dcs_write_0(DCS_DISPLAY_OFF);
 696         taal_sleep_in(td);
 697
 698         /* wait a bit so that the message goes through */
 699         msleep(10);
 700
 701         if (dssdev->platform_disable)
 702                 dssdev->platform_disable(dssdev);
 703
 704         td->enabled = 0;
 705 }
 706
 707 static int taal_suspend(struct omap_dss_device *dssdev)
 708 {
 709         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 710         struct backlight_device *bldev = td->bldev;
 711
 712         bldev->props.power = FB_BLANK_POWERDOWN;
 713         taal_bl_update_status(bldev);
 714
 715         return 0;
 716 }
 717
 718 static int taal_resume(struct omap_dss_device *dssdev)
 719 {
 720         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 721         struct backlight_device *bldev = td->bldev;
 722
 723         bldev->props.power = FB_BLANK_UNBLANK;
 724         taal_bl_update_status(bldev);
 725
 726         return 0;
 727 }
 728
 729 static void taal_setup_update(struct omap_dss_device *dssdev,
 730                                     u16 x, u16 y, u16 w, u16 h)
 731 {
 732         taal_set_update_window(x, y, w, h);
 733 }
 734
 735 static int taal_enable_te(struct omap_dss_device *dssdev, bool enable)
 736 {
 737         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 738         int r;
 739
 740         td->te_enabled = enable;
 741
 742         if (enable)
 743                 r = taal_dcs_write_1(DCS_TEAR_ON, 0);
 744         else
 745                 r = taal_dcs_write_0(DCS_TEAR_OFF);
 746
 747         return r;
 748 }
 749
 750 static int taal_wait_te(struct omap_dss_device *dssdev)
 751 {
 752         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 753         long wait = msecs_to_jiffies(500);
 754
 755         if (!td->use_ext_te || !td->te_enabled)
 756                 return 0;
 757
 758         INIT_COMPLETION(td->te_completion);
 759         wait = wait_for_completion_timeout(&td->te_completion, wait);
 760         if (wait == 0) {
 761                 dev_err(&dssdev->dev, "timeout waiting TE\n");
 762                 return -ETIME;
 763         }
 764
 765         return 0;
 766 }
 767
 768 static int taal_rotate(struct omap_dss_device *dssdev, u8 rotate)
 769 {
 770         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 771         int r;
 772
 773         dev_dbg(&dssdev->dev, "rotate %d\n", rotate);
 774
 775         if (td->enabled) {
 776                 r = taal_set_addr_mode(rotate, td->mirror);
 777
 778                 if (r)
 779                         return r;
 780         }
 781
 782         td->rotate = rotate;
 783
 784         return 0;
 785 }
 786
 787 static u8 taal_get_rotate(struct omap_dss_device *dssdev)
 788 {
 789         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 790         return td->rotate;
 791 }
 792
 793 static int taal_mirror(struct omap_dss_device *dssdev, bool enable)
 794 {
 795         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 796         int r;
 797
 798         dev_dbg(&dssdev->dev, "mirror %d\n", enable);
 799
 800         if (td->enabled) {
 801                 r = taal_set_addr_mode(td->rotate, enable);
 802
 803                 if (r)
 804                         return r;
 805         }
 806
 807         td->mirror = enable;
 808
 809         return 0;
 810 }
 811
 812 static bool taal_get_mirror(struct omap_dss_device *dssdev)
 813 {
 814         struct taal_data *td = dev_get_drvdata(&dssdev->dev);
 815         return td->mirror;
 816 }
 817
 818 static int taal_run_test(struct omap_dss_device *dssdev, int test_num)
 819 {
 820         u8 id1, id2, id3;
 821         int r;
 822
 823         r = taal_dcs_read_1(DCS_GET_ID1, &id1);
 824         if (r)
 825                 return r;
 826         r = taal_dcs_read_1(DCS_GET_ID2, &id2);
 827         if (r)
 828                 return r;
 829         r = taal_dcs_read_1(DCS_GET_ID3, &id3);
 830         if (r)
 831                 return r;
 832
 833         return 0;
 834 }
 835
 836 static int taal_memory_read(struct omap_dss_device *dssdev,
 837                 void *buf, size_t size,
 838                 u16 x, u16 y, u16 w, u16 h)
 839 {
 840         int r;
 841         int first = 1;
 842         int plen;
 843         unsigned buf_used = 0;
 844
 845         if (size < w * h * 3)
 846                 return -ENOMEM;
 847
 848         size = min(w * h * 3,
 849                         dssdev->panel.timings.x_res *
 850                         dssdev->panel.timings.y_res * 3);
 851
 852         /* plen 1 or 2 goes into short packet. until checksum error is fixed,
 853          * use short packets. plen 32 works, but bigger packets seem to cause
 854          * an error. */
 855         if (size % 2)
 856                 plen = 1;
 857         else
 858                 plen = 2;
 859
 860         taal_setup_update(dssdev, x, y, w, h);
 861
 862         r = dsi_vc_set_max_rx_packet_size(TCH, plen);
 863         if (r)
 864                 return r;
 865
 866         while (buf_used < size) {
 867                 u8 dcs_cmd = first ? 0x2e : 0x3e;
 868                 first = 0;
 869
 870                 r = dsi_vc_dcs_read(TCH, dcs_cmd,
 871                                 buf + buf_used, size - buf_used);
 872
 873                 if (r < 0) {
 874                         dev_err(&dssdev->dev, "read error\n");
 875                         goto err;
 876                 }
 877
 878                 buf_used += r;
 879
 880                 if (r < plen) {
 881                         dev_err(&dssdev->dev, "short read\n");
 882                         break;
 883                 }
 884
 885                 if (signal_pending(current)) {
 886                         dev_err(&dssdev->dev, "signal pending, "
 887                                         "aborting memory read\n");
 888                         r = -ERESTARTSYS;
 889                         goto err;
 890                 }
 891         }
 892
 893         r = buf_used;
 894
 895 err:
 896         dsi_vc_set_max_rx_packet_size(TCH, 1);
 897
 898         return r;
 899 }
 900
 901 static void taal_esd_work(struct work_struct *work)
 902 {
 903         struct taal_data *td = container_of(work, struct taal_data,
 904                         esd_work.work);
 905         struct omap_dss_device *dssdev = td->dssdev;
 906         u8 state1, state2;
 907         int r;
 908
 909         if (!td->enabled)
 910                 return;
 911
 912         dsi_bus_lock();
 913
 914         r = taal_dcs_read_1(DCS_RDDSDR, &state1);
 915         if (r) {
 916                 dev_err(&dssdev->dev, "failed to read Taal status\n");
 917                 goto err;
 918         }
 919
 920         /* Run self diagnostics */
 921         r = taal_sleep_out(td);
 922         if (r) {
 923                 dev_err(&dssdev->dev, "failed to run Taal self-diagnostics\n");
 924                 goto err;
 925         }
 926
 927         r = taal_dcs_read_1(DCS_RDDSDR, &state2);
 928         if (r) {
 929                 dev_err(&dssdev->dev, "failed to read Taal status\n");
 930                 goto err;
 931         }
 932
 933         /* Each sleep out command will trigger a self diagnostic and flip
 934          * Bit6 if the test passes.
 935          */
 936         if (!((state1 ^ state2) & (1 << 6))) {
 937                 dev_err(&dssdev->dev, "LCD self diagnostics failed\n");
 938                 goto err;
 939         }
 940         /* Self-diagnostics result is also shown on TE GPIO line. We need
 941          * to re-enable TE after self diagnostics */
 942         if (td->use_ext_te && td->te_enabled)
 943                 taal_enable_te(dssdev, true);
 944
 945         dsi_bus_unlock();
 946
 947         queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);
 948
 949         return;
 950 err:
 951         dev_err(&dssdev->dev, "performing LCD reset\n");
 952
 953         taal_disable(dssdev);
 954         taal_enable(dssdev);
 955
 956         dsi_bus_unlock();
 957
 958         queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);
 959 }
 960
 961 static struct omap_dss_driver taal_driver = {
 962         .probe          = taal_probe,
 963         .remove         = taal_remove,
 964
 965         .enable         = taal_enable,
 966         .disable        = taal_disable,
 967         .suspend        = taal_suspend,
 968         .resume         = taal_resume,
 969
 970         .setup_update   = taal_setup_update,
 971         .enable_te      = taal_enable_te,
 972         .wait_for_te    = taal_wait_te,
 973         .set_rotate     = taal_rotate,
 974         .get_rotate     = taal_get_rotate,
 975         .set_mirror     = taal_mirror,
 976         .get_mirror     = taal_get_mirror,
 977         .run_test       = taal_run_test,
 978         .memory_read    = taal_memory_read,
 979
 980         .driver         = {
 981                 .name   = "taal",
 982                 .owner  = THIS_MODULE,
 983         },
 984 };
 985
 986 static int __init taal_init(void)
 987 {
 988         omap_dss_register_driver(&taal_driver);
 989
 990         return 0;
 991 }
 992
 993 static void __exit taal_exit(void)
 994 {
 995         omap_dss_unregister_driver(&taal_driver);
 996 }
 997
 998 module_init(taal_init);
 999 module_exit(taal_exit);
1000
1001 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
1002 MODULE_DESCRIPTION("Taal Driver");
1003 MODULE_LICENSE("GPL");