linux/drivers/gpu/drm/omapdrm/displays/panel-tpo-td043mtea1.c
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   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/consumer.h>
  18#include <linux/err.h>
  19#include <linux/slab.h>
  20#include <linux/of_gpio.h>
  21
  22#include "../dss/omapdss.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
  51static const u16 tpo_td043_def_gamma[12] = {
  52        105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
  53};
  54
  55struct 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
  75static 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_RISING_EDGE,
  94};
  95
  96#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
  97
  98static 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
 121static 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
 143static 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
 155static 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
 164static 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
 171static 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
 179static 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
 201static 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
 209static 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
 228static 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
 248static 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
 271static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
 272                tpo_td043_vmirror_show, tpo_td043_vmirror_store);
 273static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 274                tpo_td043_mode_show, tpo_td043_mode_store);
 275static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
 276                tpo_td043_gamma_show, tpo_td043_gamma_store);
 277
 278static struct attribute *tpo_td043_attrs[] = {
 279        &dev_attr_vmirror.attr,
 280        &dev_attr_mode.attr,
 281        &dev_attr_gamma.attr,
 282        NULL,
 283};
 284
 285static struct attribute_group tpo_td043_attr_group = {
 286        .attrs = tpo_td043_attrs,
 287};
 288
 289static 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
 319static 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
 340static 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
 356static 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
 367static 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        if (ddata->data_lines)
 380                in->ops.dpi->set_data_lines(in, ddata->data_lines);
 381        in->ops.dpi->set_timings(in, &ddata->videomode);
 382
 383        r = in->ops.dpi->enable(in);
 384        if (r)
 385                return r;
 386
 387        /*
 388         * If we are resuming from system suspend, SPI clocks might not be
 389         * enabled yet, so we'll program the LCD from SPI PM resume callback.
 390         */
 391        if (!ddata->spi_suspended) {
 392                r = tpo_td043_power_on(ddata);
 393                if (r) {
 394                        in->ops.dpi->disable(in);
 395                        return r;
 396                }
 397        }
 398
 399        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 400
 401        return 0;
 402}
 403
 404static void tpo_td043_disable(struct omap_dss_device *dssdev)
 405{
 406        struct panel_drv_data *ddata = to_panel_data(dssdev);
 407        struct omap_dss_device *in = ddata->in;
 408
 409        if (!omapdss_device_is_enabled(dssdev))
 410                return;
 411
 412        in->ops.dpi->disable(in);
 413
 414        if (!ddata->spi_suspended)
 415                tpo_td043_power_off(ddata);
 416
 417        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 418}
 419
 420static void tpo_td043_set_timings(struct omap_dss_device *dssdev,
 421                struct omap_video_timings *timings)
 422{
 423        struct panel_drv_data *ddata = to_panel_data(dssdev);
 424        struct omap_dss_device *in = ddata->in;
 425
 426        ddata->videomode = *timings;
 427        dssdev->panel.timings = *timings;
 428
 429        in->ops.dpi->set_timings(in, timings);
 430}
 431
 432static void tpo_td043_get_timings(struct omap_dss_device *dssdev,
 433                struct omap_video_timings *timings)
 434{
 435        struct panel_drv_data *ddata = to_panel_data(dssdev);
 436
 437        *timings = ddata->videomode;
 438}
 439
 440static int tpo_td043_check_timings(struct omap_dss_device *dssdev,
 441                struct omap_video_timings *timings)
 442{
 443        struct panel_drv_data *ddata = to_panel_data(dssdev);
 444        struct omap_dss_device *in = ddata->in;
 445
 446        return in->ops.dpi->check_timings(in, timings);
 447}
 448
 449static struct omap_dss_driver tpo_td043_ops = {
 450        .connect        = tpo_td043_connect,
 451        .disconnect     = tpo_td043_disconnect,
 452
 453        .enable         = tpo_td043_enable,
 454        .disable        = tpo_td043_disable,
 455
 456        .set_timings    = tpo_td043_set_timings,
 457        .get_timings    = tpo_td043_get_timings,
 458        .check_timings  = tpo_td043_check_timings,
 459
 460        .set_mirror     = tpo_td043_set_hmirror,
 461        .get_mirror     = tpo_td043_get_hmirror,
 462
 463        .get_resolution = omapdss_default_get_resolution,
 464};
 465
 466static int tpo_td043_probe_of(struct spi_device *spi)
 467{
 468        struct device_node *node = spi->dev.of_node;
 469        struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 470        struct omap_dss_device *in;
 471        int gpio;
 472
 473        gpio = of_get_named_gpio(node, "reset-gpios", 0);
 474        if (!gpio_is_valid(gpio)) {
 475                dev_err(&spi->dev, "failed to parse enable gpio\n");
 476                return gpio;
 477        }
 478        ddata->nreset_gpio = gpio;
 479
 480        in = omapdss_of_find_source_for_first_ep(node);
 481        if (IS_ERR(in)) {
 482                dev_err(&spi->dev, "failed to find video source\n");
 483                return PTR_ERR(in);
 484        }
 485
 486        ddata->in = in;
 487
 488        return 0;
 489}
 490
 491static int tpo_td043_probe(struct spi_device *spi)
 492{
 493        struct panel_drv_data *ddata;
 494        struct omap_dss_device *dssdev;
 495        int r;
 496
 497        dev_dbg(&spi->dev, "%s\n", __func__);
 498
 499        spi->bits_per_word = 16;
 500        spi->mode = SPI_MODE_0;
 501
 502        r = spi_setup(spi);
 503        if (r < 0) {
 504                dev_err(&spi->dev, "spi_setup failed: %d\n", r);
 505                return r;
 506        }
 507
 508        ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
 509        if (ddata == NULL)
 510                return -ENOMEM;
 511
 512        dev_set_drvdata(&spi->dev, ddata);
 513
 514        ddata->spi = spi;
 515
 516        if (!spi->dev.of_node)
 517                return -ENODEV;
 518
 519        r = tpo_td043_probe_of(spi);
 520        if (r)
 521                return r;
 522
 523        ddata->mode = TPO_R02_MODE_800x480;
 524        memcpy(ddata->gamma, tpo_td043_def_gamma, sizeof(ddata->gamma));
 525
 526        ddata->vcc_reg = devm_regulator_get(&spi->dev, "vcc");
 527        if (IS_ERR(ddata->vcc_reg)) {
 528                dev_err(&spi->dev, "failed to get LCD VCC regulator\n");
 529                r = PTR_ERR(ddata->vcc_reg);
 530                goto err_regulator;
 531        }
 532
 533        if (gpio_is_valid(ddata->nreset_gpio)) {
 534                r = devm_gpio_request_one(&spi->dev,
 535                                ddata->nreset_gpio, GPIOF_OUT_INIT_LOW,
 536                                "lcd reset");
 537                if (r < 0) {
 538                        dev_err(&spi->dev, "couldn't request reset GPIO\n");
 539                        goto err_gpio_req;
 540                }
 541        }
 542
 543        r = sysfs_create_group(&spi->dev.kobj, &tpo_td043_attr_group);
 544        if (r) {
 545                dev_err(&spi->dev, "failed to create sysfs files\n");
 546                goto err_sysfs;
 547        }
 548
 549        ddata->videomode = tpo_td043_timings;
 550
 551        dssdev = &ddata->dssdev;
 552        dssdev->dev = &spi->dev;
 553        dssdev->driver = &tpo_td043_ops;
 554        dssdev->type = OMAP_DISPLAY_TYPE_DPI;
 555        dssdev->owner = THIS_MODULE;
 556        dssdev->panel.timings = ddata->videomode;
 557
 558        r = omapdss_register_display(dssdev);
 559        if (r) {
 560                dev_err(&spi->dev, "Failed to register panel\n");
 561                goto err_reg;
 562        }
 563
 564        return 0;
 565
 566err_reg:
 567        sysfs_remove_group(&spi->dev.kobj, &tpo_td043_attr_group);
 568err_sysfs:
 569err_gpio_req:
 570err_regulator:
 571        omap_dss_put_device(ddata->in);
 572        return r;
 573}
 574
 575static int tpo_td043_remove(struct spi_device *spi)
 576{
 577        struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
 578        struct omap_dss_device *dssdev = &ddata->dssdev;
 579        struct omap_dss_device *in = ddata->in;
 580
 581        dev_dbg(&ddata->spi->dev, "%s\n", __func__);
 582
 583        omapdss_unregister_display(dssdev);
 584
 585        tpo_td043_disable(dssdev);
 586        tpo_td043_disconnect(dssdev);
 587
 588        omap_dss_put_device(in);
 589
 590        sysfs_remove_group(&spi->dev.kobj, &tpo_td043_attr_group);
 591
 592        return 0;
 593}
 594
 595#ifdef CONFIG_PM_SLEEP
 596static int tpo_td043_spi_suspend(struct device *dev)
 597{
 598        struct panel_drv_data *ddata = dev_get_drvdata(dev);
 599
 600        dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", ddata);
 601
 602        ddata->power_on_resume = ddata->powered_on;
 603        tpo_td043_power_off(ddata);
 604        ddata->spi_suspended = 1;
 605
 606        return 0;
 607}
 608
 609static int tpo_td043_spi_resume(struct device *dev)
 610{
 611        struct panel_drv_data *ddata = dev_get_drvdata(dev);
 612        int ret;
 613
 614        dev_dbg(dev, "tpo_td043_spi_resume\n");
 615
 616        if (ddata->power_on_resume) {
 617                ret = tpo_td043_power_on(ddata);
 618                if (ret)
 619                        return ret;
 620        }
 621        ddata->spi_suspended = 0;
 622
 623        return 0;
 624}
 625#endif
 626
 627static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm,
 628        tpo_td043_spi_suspend, tpo_td043_spi_resume);
 629
 630static const struct of_device_id tpo_td043_of_match[] = {
 631        { .compatible = "omapdss,tpo,td043mtea1", },
 632        {},
 633};
 634
 635MODULE_DEVICE_TABLE(of, tpo_td043_of_match);
 636
 637static struct spi_driver tpo_td043_spi_driver = {
 638        .driver = {
 639                .name   = "panel-tpo-td043mtea1",
 640                .pm     = &tpo_td043_spi_pm,
 641                .of_match_table = tpo_td043_of_match,
 642                .suppress_bind_attrs = true,
 643        },
 644        .probe  = tpo_td043_probe,
 645        .remove = tpo_td043_remove,
 646};
 647
 648module_spi_driver(tpo_td043_spi_driver);
 649
 650MODULE_ALIAS("spi:tpo,td043mtea1");
 651MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
 652MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
 653MODULE_LICENSE("GPL");
 654