drivers/gpu/drm/bridge/lontium-lt9611uxc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
   4  * Copyright (c) 2019-2020. Linaro Limited.
   5  */
   6
   7 #include <linux/firmware.h>
   8 #include <linux/gpio/consumer.h>
   9 #include <linux/i2c.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/module.h>
  12 #include <linux/mutex.h>
  13 #include <linux/of_graph.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regmap.h>
  16 #include <linux/regulator/consumer.h>
  17 #include <linux/wait.h>
  18 #include <linux/workqueue.h>
  19
  20 #include <sound/hdmi-codec.h>
  21
  22 #include <drm/drm_atomic_helper.h>
  23 #include <drm/drm_bridge.h>
  24 #include <drm/drm_mipi_dsi.h>
  25 #include <drm/drm_print.h>
  26 #include <drm/drm_probe_helper.h>
  27
  28 #define EDID_BLOCK_SIZE 128
  29 #define EDID_NUM_BLOCKS 2
  30
  31 struct lt9611uxc {
  32         struct device *dev;
  33         struct drm_bridge bridge;
  34         struct drm_connector connector;
  35
  36         struct regmap *regmap;
  37         /* Protects all accesses to registers by stopping the on-chip MCU */
  38         struct mutex ocm_lock;
  39
  40         struct wait_queue_head wq;
  41         struct work_struct work;
  42
  43         struct device_node *dsi0_node;
  44         struct device_node *dsi1_node;
  45         struct mipi_dsi_device *dsi0;
  46         struct mipi_dsi_device *dsi1;
  47         struct platform_device *audio_pdev;
  48
  49         struct gpio_desc *reset_gpio;
  50         struct gpio_desc *enable_gpio;
  51
  52         struct regulator_bulk_data supplies[2];
  53
  54         struct i2c_client *client;
  55
  56         bool hpd_supported;
  57         bool edid_read;
  58         /* can be accessed from different threads, so protect this with ocm_lock */
  59         bool hdmi_connected;
  60         uint8_t fw_version;
  61 };
  62
  63 #define LT9611_PAGE_CONTROL     0xff
  64
  65 static const struct regmap_range_cfg lt9611uxc_ranges[] = {
  66         {
  67                 .name = "register_range",
  68                 .range_min =  0,
  69                 .range_max = 0xd0ff,
  70                 .selector_reg = LT9611_PAGE_CONTROL,
  71                 .selector_mask = 0xff,
  72                 .selector_shift = 0,
  73                 .window_start = 0,
  74                 .window_len = 0x100,
  75         },
  76 };
  77
  78 static const struct regmap_config lt9611uxc_regmap_config = {
  79         .reg_bits = 8,
  80         .val_bits = 8,
  81         .max_register = 0xffff,
  82         .ranges = lt9611uxc_ranges,
  83         .num_ranges = ARRAY_SIZE(lt9611uxc_ranges),
  84 };
  85
  86 struct lt9611uxc_mode {
  87         u16 hdisplay;
  88         u16 vdisplay;
  89         u8 vrefresh;
  90 };
  91
  92 /*
  93  * This chip supports only a fixed set of modes.
  94  * Enumerate them here to check whether the mode is supported.
  95  */
  96 static struct lt9611uxc_mode lt9611uxc_modes[] = {
  97         { 1920, 1080, 60 },
  98         { 1920, 1080, 30 },
  99         { 1920, 1080, 25 },
 100         { 1366, 768, 60 },
 101         { 1360, 768, 60 },
 102         { 1280, 1024, 60 },
 103         { 1280, 800, 60 },
 104         { 1280, 720, 60 },
 105         { 1280, 720, 50 },
 106         { 1280, 720, 30 },
 107         { 1152, 864, 60 },
 108         { 1024, 768, 60 },
 109         { 800, 600, 60 },
 110         { 720, 576, 50 },
 111         { 720, 480, 60 },
 112         { 640, 480, 60 },
 113 };
 114
 115 static struct lt9611uxc *bridge_to_lt9611uxc(struct drm_bridge *bridge)
 116 {
 117         return container_of(bridge, struct lt9611uxc, bridge);
 118 }
 119
 120 static struct lt9611uxc *connector_to_lt9611uxc(struct drm_connector *connector)
 121 {
 122         return container_of(connector, struct lt9611uxc, connector);
 123 }
 124
 125 static void lt9611uxc_lock(struct lt9611uxc *lt9611uxc)
 126 {
 127         mutex_lock(&lt9611uxc->ocm_lock);
 128         regmap_write(lt9611uxc->regmap, 0x80ee, 0x01);
 129 }
 130
 131 static void lt9611uxc_unlock(struct lt9611uxc *lt9611uxc)
 132 {
 133         regmap_write(lt9611uxc->regmap, 0x80ee, 0x00);
 134         msleep(50);
 135         mutex_unlock(&lt9611uxc->ocm_lock);
 136 }
 137
 138 static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id)
 139 {
 140         struct lt9611uxc *lt9611uxc = dev_id;
 141         unsigned int irq_status = 0;
 142         unsigned int hpd_status = 0;
 143
 144         lt9611uxc_lock(lt9611uxc);
 145
 146         regmap_read(lt9611uxc->regmap, 0xb022, &irq_status);
 147         regmap_read(lt9611uxc->regmap, 0xb023, &hpd_status);
 148         if (irq_status)
 149                 regmap_write(lt9611uxc->regmap, 0xb022, 0);
 150
 151         if (irq_status & BIT(0)) {
 152                 lt9611uxc->edid_read = !!(hpd_status & BIT(0));
 153                 wake_up_all(&lt9611uxc->wq);
 154         }
 155
 156         if (irq_status & BIT(1)) {
 157                 lt9611uxc->hdmi_connected = hpd_status & BIT(1);
 158                 schedule_work(&lt9611uxc->work);
 159         }
 160
 161         lt9611uxc_unlock(lt9611uxc);
 162
 163         return IRQ_HANDLED;
 164 }
 165
 166 static void lt9611uxc_hpd_work(struct work_struct *work)
 167 {
 168         struct lt9611uxc *lt9611uxc = container_of(work, struct lt9611uxc, work);
 169         bool connected;
 170
 171         if (lt9611uxc->connector.dev) {
 172                 if (lt9611uxc->connector.dev->mode_config.funcs)
 173                         drm_kms_helper_hotplug_event(lt9611uxc->connector.dev);
 174         } else {
 175
 176                 mutex_lock(&lt9611uxc->ocm_lock);
 177                 connected = lt9611uxc->hdmi_connected;
 178                 mutex_unlock(&lt9611uxc->ocm_lock);
 179
 180                 drm_bridge_hpd_notify(&lt9611uxc->bridge,
 181                                       connected ?
 182                                       connector_status_connected :
 183                                       connector_status_disconnected);
 184         }
 185 }
 186
 187 static void lt9611uxc_reset(struct lt9611uxc *lt9611uxc)
 188 {
 189         gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
 190         msleep(20);
 191
 192         gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 0);
 193         msleep(20);
 194
 195         gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
 196         msleep(300);
 197 }
 198
 199 static void lt9611uxc_assert_5v(struct lt9611uxc *lt9611uxc)
 200 {
 201         if (!lt9611uxc->enable_gpio)
 202                 return;
 203
 204         gpiod_set_value_cansleep(lt9611uxc->enable_gpio, 1);
 205         msleep(20);
 206 }
 207
 208 static int lt9611uxc_regulator_init(struct lt9611uxc *lt9611uxc)
 209 {
 210         int ret;
 211
 212         lt9611uxc->supplies[0].supply = "vdd";
 213         lt9611uxc->supplies[1].supply = "vcc";
 214
 215         ret = devm_regulator_bulk_get(lt9611uxc->dev, 2, lt9611uxc->supplies);
 216         if (ret < 0)
 217                 return ret;
 218
 219         return regulator_set_load(lt9611uxc->supplies[0].consumer, 200000);
 220 }
 221
 222 static int lt9611uxc_regulator_enable(struct lt9611uxc *lt9611uxc)
 223 {
 224         int ret;
 225
 226         ret = regulator_enable(lt9611uxc->supplies[0].consumer);
 227         if (ret < 0)
 228                 return ret;
 229
 230         usleep_range(1000, 10000); /* 50000 according to dtsi */
 231
 232         ret = regulator_enable(lt9611uxc->supplies[1].consumer);
 233         if (ret < 0) {
 234                 regulator_disable(lt9611uxc->supplies[0].consumer);
 235                 return ret;
 236         }
 237
 238         return 0;
 239 }
 240
 241 static struct lt9611uxc_mode *lt9611uxc_find_mode(const struct drm_display_mode *mode)
 242 {
 243         int i;
 244
 245         for (i = 0; i < ARRAY_SIZE(lt9611uxc_modes); i++) {
 246                 if (lt9611uxc_modes[i].hdisplay == mode->hdisplay &&
 247                     lt9611uxc_modes[i].vdisplay == mode->vdisplay &&
 248                     lt9611uxc_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
 249                         return &lt9611uxc_modes[i];
 250                 }
 251         }
 252
 253         return NULL;
 254 }
 255
 256 static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
 257                                                     struct device_node *dsi_node)
 258 {
 259         const struct mipi_dsi_device_info info = { "lt9611uxc", 0, NULL };
 260         struct mipi_dsi_device *dsi;
 261         struct mipi_dsi_host *host;
 262         struct device *dev = lt9611uxc->dev;
 263         int ret;
 264
 265         host = of_find_mipi_dsi_host_by_node(dsi_node);
 266         if (!host) {
 267                 dev_err(dev, "failed to find dsi host\n");
 268                 return ERR_PTR(-EPROBE_DEFER);
 269         }
 270
 271         dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
 272         if (IS_ERR(dsi)) {
 273                 dev_err(dev, "failed to create dsi device\n");
 274                 return dsi;
 275         }
 276
 277         dsi->lanes = 4;
 278         dsi->format = MIPI_DSI_FMT_RGB888;
 279         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
 280                           MIPI_DSI_MODE_VIDEO_HSE;
 281
 282         ret = devm_mipi_dsi_attach(dev, dsi);
 283         if (ret < 0) {
 284                 dev_err(dev, "failed to attach dsi to host\n");
 285                 return ERR_PTR(ret);
 286         }
 287
 288         return dsi;
 289 }
 290
 291 static int lt9611uxc_connector_get_modes(struct drm_connector *connector)
 292 {
 293         struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
 294         unsigned int count;
 295         struct edid *edid;
 296
 297         edid = lt9611uxc->bridge.funcs->get_edid(&lt9611uxc->bridge, connector);
 298         drm_connector_update_edid_property(connector, edid);
 299         count = drm_add_edid_modes(connector, edid);
 300         kfree(edid);
 301
 302         return count;
 303 }
 304
 305 static enum drm_connector_status lt9611uxc_connector_detect(struct drm_connector *connector,
 306                                                             bool force)
 307 {
 308         struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
 309
 310         return lt9611uxc->bridge.funcs->detect(&lt9611uxc->bridge);
 311 }
 312
 313 static enum drm_mode_status lt9611uxc_connector_mode_valid(struct drm_connector *connector,
 314                                                            struct drm_display_mode *mode)
 315 {
 316         struct lt9611uxc_mode *lt9611uxc_mode = lt9611uxc_find_mode(mode);
 317
 318         return lt9611uxc_mode ? MODE_OK : MODE_BAD;
 319 }
 320
 321 static const struct drm_connector_helper_funcs lt9611uxc_bridge_connector_helper_funcs = {
 322         .get_modes = lt9611uxc_connector_get_modes,
 323         .mode_valid = lt9611uxc_connector_mode_valid,
 324 };
 325
 326 static const struct drm_connector_funcs lt9611uxc_bridge_connector_funcs = {
 327         .fill_modes = drm_helper_probe_single_connector_modes,
 328         .detect = lt9611uxc_connector_detect,
 329         .destroy = drm_connector_cleanup,
 330         .reset = drm_atomic_helper_connector_reset,
 331         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 332         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 333 };
 334
 335 static int lt9611uxc_connector_init(struct drm_bridge *bridge, struct lt9611uxc *lt9611uxc)
 336 {
 337         int ret;
 338
 339         if (!bridge->encoder) {
 340                 DRM_ERROR("Parent encoder object not found");
 341                 return -ENODEV;
 342         }
 343
 344         lt9611uxc->connector.polled = DRM_CONNECTOR_POLL_HPD;
 345
 346         drm_connector_helper_add(&lt9611uxc->connector,
 347                                  &lt9611uxc_bridge_connector_helper_funcs);
 348         ret = drm_connector_init(bridge->dev, &lt9611uxc->connector,
 349                                  &lt9611uxc_bridge_connector_funcs,
 350                                  DRM_MODE_CONNECTOR_HDMIA);
 351         if (ret) {
 352                 DRM_ERROR("Failed to initialize connector with drm\n");
 353                 return ret;
 354         }
 355
 356         return drm_connector_attach_encoder(&lt9611uxc->connector, bridge->encoder);
 357 }
 358
 359 static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
 360                                    enum drm_bridge_attach_flags flags)
 361 {
 362         struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
 363         int ret;
 364
 365         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
 366                 ret = lt9611uxc_connector_init(bridge, lt9611uxc);
 367                 if (ret < 0)
 368                         return ret;
 369         }
 370
 371         return 0;
 372 }
 373
 374 static enum drm_mode_status
 375 lt9611uxc_bridge_mode_valid(struct drm_bridge *bridge,
 376                             const struct drm_display_info *info,
 377                             const struct drm_display_mode *mode)
 378 {
 379         struct lt9611uxc_mode *lt9611uxc_mode;
 380
 381         lt9611uxc_mode = lt9611uxc_find_mode(mode);
 382
 383         return lt9611uxc_mode ? MODE_OK : MODE_BAD;
 384 }
 385
 386 static void lt9611uxc_video_setup(struct lt9611uxc *lt9611uxc,
 387                                   const struct drm_display_mode *mode)
 388 {
 389         u32 h_total, hactive, hsync_len, hfront_porch;
 390         u32 v_total, vactive, vsync_len, vfront_porch;
 391
 392         h_total = mode->htotal;
 393         v_total = mode->vtotal;
 394
 395         hactive = mode->hdisplay;
 396         hsync_len = mode->hsync_end - mode->hsync_start;
 397         hfront_porch = mode->hsync_start - mode->hdisplay;
 398
 399         vactive = mode->vdisplay;
 400         vsync_len = mode->vsync_end - mode->vsync_start;
 401         vfront_porch = mode->vsync_start - mode->vdisplay;
 402
 403         regmap_write(lt9611uxc->regmap, 0xd00d, (u8)(v_total / 256));
 404         regmap_write(lt9611uxc->regmap, 0xd00e, (u8)(v_total % 256));
 405
 406         regmap_write(lt9611uxc->regmap, 0xd00f, (u8)(vactive / 256));
 407         regmap_write(lt9611uxc->regmap, 0xd010, (u8)(vactive % 256));
 408
 409         regmap_write(lt9611uxc->regmap, 0xd011, (u8)(h_total / 256));
 410         regmap_write(lt9611uxc->regmap, 0xd012, (u8)(h_total % 256));
 411
 412         regmap_write(lt9611uxc->regmap, 0xd013, (u8)(hactive / 256));
 413         regmap_write(lt9611uxc->regmap, 0xd014, (u8)(hactive % 256));
 414
 415         regmap_write(lt9611uxc->regmap, 0xd015, (u8)(vsync_len % 256));
 416
 417         regmap_update_bits(lt9611uxc->regmap, 0xd016, 0xf, (u8)(hsync_len / 256));
 418         regmap_write(lt9611uxc->regmap, 0xd017, (u8)(hsync_len % 256));
 419
 420         regmap_update_bits(lt9611uxc->regmap, 0xd018, 0xf, (u8)(vfront_porch / 256));
 421         regmap_write(lt9611uxc->regmap, 0xd019, (u8)(vfront_porch % 256));
 422
 423         regmap_update_bits(lt9611uxc->regmap, 0xd01a, 0xf, (u8)(hfront_porch / 256));
 424         regmap_write(lt9611uxc->regmap, 0xd01b, (u8)(hfront_porch % 256));
 425 }
 426
 427 static void lt9611uxc_bridge_mode_set(struct drm_bridge *bridge,
 428                                       const struct drm_display_mode *mode,
 429                                       const struct drm_display_mode *adj_mode)
 430 {
 431         struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
 432
 433         lt9611uxc_lock(lt9611uxc);
 434         lt9611uxc_video_setup(lt9611uxc, mode);
 435         lt9611uxc_unlock(lt9611uxc);
 436 }
 437
 438 static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *bridge)
 439 {
 440         struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
 441         unsigned int reg_val = 0;
 442         int ret;
 443         bool connected = true;
 444
 445         lt9611uxc_lock(lt9611uxc);
 446
 447         if (lt9611uxc->hpd_supported) {
 448                 ret = regmap_read(lt9611uxc->regmap, 0xb023, &reg_val);
 449
 450                 if (ret)
 451                         dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret);
 452                 else
 453                         connected  = reg_val & BIT(1);
 454         }
 455         lt9611uxc->hdmi_connected = connected;
 456
 457         lt9611uxc_unlock(lt9611uxc);
 458
 459         return connected ?  connector_status_connected :
 460                                 connector_status_disconnected;
 461 }
 462
 463 static int lt9611uxc_wait_for_edid(struct lt9611uxc *lt9611uxc)
 464 {
 465         return wait_event_interruptible_timeout(lt9611uxc->wq, lt9611uxc->edid_read,
 466                         msecs_to_jiffies(500));
 467 }
 468
 469 static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
 470 {
 471         struct lt9611uxc *lt9611uxc = data;
 472         int ret;
 473
 474         if (len > EDID_BLOCK_SIZE)
 475                 return -EINVAL;
 476
 477         if (block >= EDID_NUM_BLOCKS)
 478                 return -EINVAL;
 479
 480         lt9611uxc_lock(lt9611uxc);
 481
 482         regmap_write(lt9611uxc->regmap, 0xb00b, 0x10);
 483
 484         regmap_write(lt9611uxc->regmap, 0xb00a, block * EDID_BLOCK_SIZE);
 485
 486         ret = regmap_noinc_read(lt9611uxc->regmap, 0xb0b0, buf, len);
 487         if (ret)
 488                 dev_err(lt9611uxc->dev, "edid read failed: %d\n", ret);
 489
 490         lt9611uxc_unlock(lt9611uxc);
 491
 492         return 0;
 493 };
 494
 495 static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
 496                                               struct drm_connector *connector)
 497 {
 498         struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
 499         int ret;
 500
 501         ret = lt9611uxc_wait_for_edid(lt9611uxc);
 502         if (ret < 0) {
 503                 dev_err(lt9611uxc->dev, "wait for EDID failed: %d\n", ret);
 504                 return NULL;
 505         } else if (ret == 0) {
 506                 dev_err(lt9611uxc->dev, "wait for EDID timeout\n");
 507                 return NULL;
 508         }
 509
 510         return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc);
 511 }
 512
 513 static const struct drm_bridge_funcs lt9611uxc_bridge_funcs = {
 514         .attach = lt9611uxc_bridge_attach,
 515         .mode_valid = lt9611uxc_bridge_mode_valid,
 516         .mode_set = lt9611uxc_bridge_mode_set,
 517         .detect = lt9611uxc_bridge_detect,
 518         .get_edid = lt9611uxc_bridge_get_edid,
 519 };
 520
 521 static int lt9611uxc_parse_dt(struct device *dev,
 522                               struct lt9611uxc *lt9611uxc)
 523 {
 524         lt9611uxc->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
 525         if (!lt9611uxc->dsi0_node) {
 526                 dev_err(lt9611uxc->dev, "failed to get remote node for primary dsi\n");
 527                 return -ENODEV;
 528         }
 529
 530         lt9611uxc->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
 531
 532         return 0;
 533 }
 534
 535 static int lt9611uxc_gpio_init(struct lt9611uxc *lt9611uxc)
 536 {
 537         struct device *dev = lt9611uxc->dev;
 538
 539         lt9611uxc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 540         if (IS_ERR(lt9611uxc->reset_gpio)) {
 541                 dev_err(dev, "failed to acquire reset gpio\n");
 542                 return PTR_ERR(lt9611uxc->reset_gpio);
 543         }
 544
 545         lt9611uxc->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
 546         if (IS_ERR(lt9611uxc->enable_gpio)) {
 547                 dev_err(dev, "failed to acquire enable gpio\n");
 548                 return PTR_ERR(lt9611uxc->enable_gpio);
 549         }
 550
 551         return 0;
 552 }
 553
 554 static int lt9611uxc_read_device_rev(struct lt9611uxc *lt9611uxc)
 555 {
 556         unsigned int rev0, rev1, rev2;
 557         int ret;
 558
 559         lt9611uxc_lock(lt9611uxc);
 560
 561         ret = regmap_read(lt9611uxc->regmap, 0x8100, &rev0);
 562         ret |= regmap_read(lt9611uxc->regmap, 0x8101, &rev1);
 563         ret |= regmap_read(lt9611uxc->regmap, 0x8102, &rev2);
 564         if (ret)
 565                 dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
 566         else
 567                 dev_info(lt9611uxc->dev, "LT9611 revision: 0x%02x.%02x.%02x\n", rev0, rev1, rev2);
 568
 569         lt9611uxc_unlock(lt9611uxc);
 570
 571         return ret;
 572 }
 573
 574 static int lt9611uxc_read_version(struct lt9611uxc *lt9611uxc)
 575 {
 576         unsigned int rev;
 577         int ret;
 578
 579         lt9611uxc_lock(lt9611uxc);
 580
 581         ret = regmap_read(lt9611uxc->regmap, 0xb021, &rev);
 582         if (ret)
 583                 dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
 584         else
 585                 dev_info(lt9611uxc->dev, "LT9611 version: 0x%02x\n", rev);
 586
 587         lt9611uxc_unlock(lt9611uxc);
 588
 589         return ret < 0 ? ret : rev;
 590 }
 591
 592 static int lt9611uxc_hdmi_hw_params(struct device *dev, void *data,
 593                                     struct hdmi_codec_daifmt *fmt,
 594                                     struct hdmi_codec_params *hparms)
 595 {
 596         /*
 597          * LT9611UXC will automatically detect rate and sample size, so no need
 598          * to setup anything here.
 599          */
 600         return 0;
 601 }
 602
 603 static void lt9611uxc_audio_shutdown(struct device *dev, void *data)
 604 {
 605 }
 606
 607 static int lt9611uxc_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
 608                                          struct device_node *endpoint)
 609 {
 610         struct of_endpoint of_ep;
 611         int ret;
 612
 613         ret = of_graph_parse_endpoint(endpoint, &of_ep);
 614         if (ret < 0)
 615                 return ret;
 616
 617         /*
 618          * HDMI sound should be located as reg = <2>
 619          * Then, it is sound port 0
 620          */
 621         if (of_ep.port == 2)
 622                 return 0;
 623
 624         return -EINVAL;
 625 }
 626
 627 static const struct hdmi_codec_ops lt9611uxc_codec_ops = {
 628         .hw_params      = lt9611uxc_hdmi_hw_params,
 629         .audio_shutdown = lt9611uxc_audio_shutdown,
 630         .get_dai_id     = lt9611uxc_hdmi_i2s_get_dai_id,
 631 };
 632
 633 static int lt9611uxc_audio_init(struct device *dev, struct lt9611uxc *lt9611uxc)
 634 {
 635         struct hdmi_codec_pdata codec_data = {
 636                 .ops = &lt9611uxc_codec_ops,
 637                 .max_i2s_channels = 2,
 638                 .i2s = 1,
 639                 .data = lt9611uxc,
 640         };
 641
 642         lt9611uxc->audio_pdev =
 643                 platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
 644                                               PLATFORM_DEVID_AUTO,
 645                                               &codec_data, sizeof(codec_data));
 646
 647         return PTR_ERR_OR_ZERO(lt9611uxc->audio_pdev);
 648 }
 649
 650 static void lt9611uxc_audio_exit(struct lt9611uxc *lt9611uxc)
 651 {
 652         if (lt9611uxc->audio_pdev) {
 653                 platform_device_unregister(lt9611uxc->audio_pdev);
 654                 lt9611uxc->audio_pdev = NULL;
 655         }
 656 }
 657
 658 #define LT9611UXC_FW_PAGE_SIZE 32
 659 static void lt9611uxc_firmware_write_page(struct lt9611uxc *lt9611uxc, u16 addr, const u8 *buf)
 660 {
 661         struct reg_sequence seq_write_prepare[] = {
 662                 REG_SEQ0(0x805a, 0x04),
 663                 REG_SEQ0(0x805a, 0x00),
 664
 665                 REG_SEQ0(0x805e, 0xdf),
 666                 REG_SEQ0(0x805a, 0x20),
 667                 REG_SEQ0(0x805a, 0x00),
 668                 REG_SEQ0(0x8058, 0x21),
 669         };
 670
 671         struct reg_sequence seq_write_addr[] = {
 672                 REG_SEQ0(0x805b, (addr >> 16) & 0xff),
 673                 REG_SEQ0(0x805c, (addr >> 8) & 0xff),
 674                 REG_SEQ0(0x805d, addr & 0xff),
 675                 REG_SEQ0(0x805a, 0x10),
 676                 REG_SEQ0(0x805a, 0x00),
 677         };
 678
 679         regmap_write(lt9611uxc->regmap, 0x8108, 0xbf);
 680         msleep(20);
 681         regmap_write(lt9611uxc->regmap, 0x8108, 0xff);
 682         msleep(20);
 683         regmap_multi_reg_write(lt9611uxc->regmap, seq_write_prepare, ARRAY_SIZE(seq_write_prepare));
 684         regmap_noinc_write(lt9611uxc->regmap, 0x8059, buf, LT9611UXC_FW_PAGE_SIZE);
 685         regmap_multi_reg_write(lt9611uxc->regmap, seq_write_addr, ARRAY_SIZE(seq_write_addr));
 686         msleep(20);
 687 }
 688
 689 static void lt9611uxc_firmware_read_page(struct lt9611uxc *lt9611uxc, u16 addr, char *buf)
 690 {
 691         struct reg_sequence seq_read_page[] = {
 692                 REG_SEQ0(0x805a, 0xa0),
 693                 REG_SEQ0(0x805a, 0x80),
 694                 REG_SEQ0(0x805b, (addr >> 16) & 0xff),
 695                 REG_SEQ0(0x805c, (addr >> 8) & 0xff),
 696                 REG_SEQ0(0x805d, addr & 0xff),
 697                 REG_SEQ0(0x805a, 0x90),
 698                 REG_SEQ0(0x805a, 0x80),
 699                 REG_SEQ0(0x8058, 0x21),
 700         };
 701
 702         regmap_multi_reg_write(lt9611uxc->regmap, seq_read_page, ARRAY_SIZE(seq_read_page));
 703         regmap_noinc_read(lt9611uxc->regmap, 0x805f, buf, LT9611UXC_FW_PAGE_SIZE);
 704 }
 705
 706 static char *lt9611uxc_firmware_read(struct lt9611uxc *lt9611uxc, size_t size)
 707 {
 708         struct reg_sequence seq_read_setup[] = {
 709                 REG_SEQ0(0x805a, 0x84),
 710                 REG_SEQ0(0x805a, 0x80),
 711         };
 712
 713         char *readbuf;
 714         u16 offset;
 715
 716         readbuf = kzalloc(ALIGN(size, 32), GFP_KERNEL);
 717         if (!readbuf)
 718                 return NULL;
 719
 720         regmap_multi_reg_write(lt9611uxc->regmap, seq_read_setup, ARRAY_SIZE(seq_read_setup));
 721
 722         for (offset = 0;
 723              offset < size;
 724              offset += LT9611UXC_FW_PAGE_SIZE)
 725                 lt9611uxc_firmware_read_page(lt9611uxc, offset, &readbuf[offset]);
 726
 727         return readbuf;
 728 }
 729
 730 static int lt9611uxc_firmware_update(struct lt9611uxc *lt9611uxc)
 731 {
 732         int ret;
 733         u16 offset;
 734         size_t remain;
 735         char *readbuf;
 736         const struct firmware *fw;
 737
 738         struct reg_sequence seq_setup[] = {
 739                 REG_SEQ0(0x805e, 0xdf),
 740                 REG_SEQ0(0x8058, 0x00),
 741                 REG_SEQ0(0x8059, 0x50),
 742                 REG_SEQ0(0x805a, 0x10),
 743                 REG_SEQ0(0x805a, 0x00),
 744         };
 745
 746
 747         struct reg_sequence seq_block_erase[] = {
 748                 REG_SEQ0(0x805a, 0x04),
 749                 REG_SEQ0(0x805a, 0x00),
 750                 REG_SEQ0(0x805b, 0x00),
 751                 REG_SEQ0(0x805c, 0x00),
 752                 REG_SEQ0(0x805d, 0x00),
 753                 REG_SEQ0(0x805a, 0x01),
 754                 REG_SEQ0(0x805a, 0x00),
 755         };
 756
 757         ret = request_firmware(&fw, "lt9611uxc_fw.bin", lt9611uxc->dev);
 758         if (ret < 0)
 759                 return ret;
 760
 761         dev_info(lt9611uxc->dev, "Updating firmware\n");
 762         lt9611uxc_lock(lt9611uxc);
 763
 764         regmap_multi_reg_write(lt9611uxc->regmap, seq_setup, ARRAY_SIZE(seq_setup));
 765
 766         /*
 767          * Need erase block 2 timess here. Sometimes, block erase can fail.
 768          * This is a workaroud.
 769          */
 770         regmap_multi_reg_write(lt9611uxc->regmap, seq_block_erase, ARRAY_SIZE(seq_block_erase));
 771         msleep(3000);
 772         regmap_multi_reg_write(lt9611uxc->regmap, seq_block_erase, ARRAY_SIZE(seq_block_erase));
 773         msleep(3000);
 774
 775         for (offset = 0, remain = fw->size;
 776              remain >= LT9611UXC_FW_PAGE_SIZE;
 777              offset += LT9611UXC_FW_PAGE_SIZE, remain -= LT9611UXC_FW_PAGE_SIZE)
 778                 lt9611uxc_firmware_write_page(lt9611uxc, offset, fw->data + offset);
 779
 780         if (remain > 0) {
 781                 char buf[LT9611UXC_FW_PAGE_SIZE];
 782
 783                 memset(buf, 0xff, LT9611UXC_FW_PAGE_SIZE);
 784                 memcpy(buf, fw->data + offset, remain);
 785                 lt9611uxc_firmware_write_page(lt9611uxc, offset, buf);
 786         }
 787         msleep(20);
 788
 789         readbuf = lt9611uxc_firmware_read(lt9611uxc, fw->size);
 790         if (!readbuf) {
 791                 ret = -ENOMEM;
 792                 goto out;
 793         }
 794
 795         if (!memcmp(readbuf, fw->data, fw->size)) {
 796                 dev_err(lt9611uxc->dev, "Firmware update failed\n");
 797                 print_hex_dump(KERN_ERR, "fw: ", DUMP_PREFIX_OFFSET, 16, 1, readbuf, fw->size, false);
 798                 ret = -EINVAL;
 799         } else {
 800                 dev_info(lt9611uxc->dev, "Firmware updates successfully\n");
 801                 ret = 0;
 802         }
 803         kfree(readbuf);
 804
 805 out:
 806         lt9611uxc_unlock(lt9611uxc);
 807         lt9611uxc_reset(lt9611uxc);
 808         release_firmware(fw);
 809
 810         return ret;
 811 }
 812
 813 static ssize_t lt9611uxc_firmware_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
 814 {
 815         struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
 816         int ret;
 817
 818         ret = lt9611uxc_firmware_update(lt9611uxc);
 819         if (ret < 0)
 820                 return ret;
 821         return len;
 822 }
 823
 824 static ssize_t lt9611uxc_firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
 825 {
 826         struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
 827
 828         return sysfs_emit(buf, "%02x\n", lt9611uxc->fw_version);
 829 }
 830
 831 static DEVICE_ATTR_RW(lt9611uxc_firmware);
 832
 833 static struct attribute *lt9611uxc_attrs[] = {
 834         &dev_attr_lt9611uxc_firmware.attr,
 835         NULL,
 836 };
 837
 838 static const struct attribute_group lt9611uxc_attr_group = {
 839         .attrs = lt9611uxc_attrs,
 840 };
 841
 842 static const struct attribute_group *lt9611uxc_attr_groups[] = {
 843         &lt9611uxc_attr_group,
 844         NULL,
 845 };
 846
 847 static int lt9611uxc_probe(struct i2c_client *client,
 848                            const struct i2c_device_id *id)
 849 {
 850         struct lt9611uxc *lt9611uxc;
 851         struct device *dev = &client->dev;
 852         int ret;
 853         bool fw_updated = false;
 854
 855         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 856                 dev_err(dev, "device doesn't support I2C\n");
 857                 return -ENODEV;
 858         }
 859
 860         lt9611uxc = devm_kzalloc(dev, sizeof(*lt9611uxc), GFP_KERNEL);
 861         if (!lt9611uxc)
 862                 return -ENOMEM;
 863
 864         lt9611uxc->dev = dev;
 865         lt9611uxc->client = client;
 866         mutex_init(&lt9611uxc->ocm_lock);
 867
 868         lt9611uxc->regmap = devm_regmap_init_i2c(client, &lt9611uxc_regmap_config);
 869         if (IS_ERR(lt9611uxc->regmap)) {
 870                 dev_err(lt9611uxc->dev, "regmap i2c init failed\n");
 871                 return PTR_ERR(lt9611uxc->regmap);
 872         }
 873
 874         ret = lt9611uxc_parse_dt(dev, lt9611uxc);
 875         if (ret) {
 876                 dev_err(dev, "failed to parse device tree\n");
 877                 return ret;
 878         }
 879
 880         ret = lt9611uxc_gpio_init(lt9611uxc);
 881         if (ret < 0)
 882                 goto err_of_put;
 883
 884         ret = lt9611uxc_regulator_init(lt9611uxc);
 885         if (ret < 0)
 886                 goto err_of_put;
 887
 888         lt9611uxc_assert_5v(lt9611uxc);
 889
 890         ret = lt9611uxc_regulator_enable(lt9611uxc);
 891         if (ret)
 892                 goto err_of_put;
 893
 894         lt9611uxc_reset(lt9611uxc);
 895
 896         ret = lt9611uxc_read_device_rev(lt9611uxc);
 897         if (ret) {
 898                 dev_err(dev, "failed to read chip rev\n");
 899                 goto err_disable_regulators;
 900         }
 901
 902 retry:
 903         ret = lt9611uxc_read_version(lt9611uxc);
 904         if (ret < 0) {
 905                 dev_err(dev, "failed to read FW version\n");
 906                 goto err_disable_regulators;
 907         } else if (ret == 0) {
 908                 if (!fw_updated) {
 909                         fw_updated = true;
 910                         dev_err(dev, "FW version 0, enforcing firmware update\n");
 911                         ret = lt9611uxc_firmware_update(lt9611uxc);
 912                         if (ret < 0)
 913                                 goto err_disable_regulators;
 914                         else
 915                                 goto retry;
 916                 } else {
 917                         dev_err(dev, "FW version 0, update failed\n");
 918                         ret = -EOPNOTSUPP;
 919                         goto err_disable_regulators;
 920                 }
 921         } else if (ret < 0x40) {
 922                 dev_info(dev, "FW version 0x%x, HPD not supported\n", ret);
 923         } else {
 924                 lt9611uxc->hpd_supported = true;
 925         }
 926         lt9611uxc->fw_version = ret;
 927
 928         init_waitqueue_head(&lt9611uxc->wq);
 929         INIT_WORK(&lt9611uxc->work, lt9611uxc_hpd_work);
 930
 931         ret = devm_request_threaded_irq(dev, client->irq, NULL,
 932                                         lt9611uxc_irq_thread_handler,
 933                                         IRQF_ONESHOT, "lt9611uxc", lt9611uxc);
 934         if (ret) {
 935                 dev_err(dev, "failed to request irq\n");
 936                 goto err_disable_regulators;
 937         }
 938
 939         i2c_set_clientdata(client, lt9611uxc);
 940
 941         lt9611uxc->bridge.funcs = &lt9611uxc_bridge_funcs;
 942         lt9611uxc->bridge.of_node = client->dev.of_node;
 943         lt9611uxc->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
 944         if (lt9611uxc->hpd_supported)
 945                 lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_HPD;
 946         lt9611uxc->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
 947
 948         drm_bridge_add(&lt9611uxc->bridge);
 949
 950         /* Attach primary DSI */
 951         lt9611uxc->dsi0 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi0_node);
 952         if (IS_ERR(lt9611uxc->dsi0)) {
 953                 ret = PTR_ERR(lt9611uxc->dsi0);
 954                 goto err_remove_bridge;
 955         }
 956
 957         /* Attach secondary DSI, if specified */
 958         if (lt9611uxc->dsi1_node) {
 959                 lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi1_node);
 960                 if (IS_ERR(lt9611uxc->dsi1)) {
 961                         ret = PTR_ERR(lt9611uxc->dsi1);
 962                         goto err_remove_bridge;
 963                 }
 964         }
 965
 966         return lt9611uxc_audio_init(dev, lt9611uxc);
 967
 968 err_remove_bridge:
 969         drm_bridge_remove(&lt9611uxc->bridge);
 970
 971 err_disable_regulators:
 972         regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
 973
 974 err_of_put:
 975         of_node_put(lt9611uxc->dsi1_node);
 976         of_node_put(lt9611uxc->dsi0_node);
 977
 978         return ret;
 979 }
 980
 981 static int lt9611uxc_remove(struct i2c_client *client)
 982 {
 983         struct lt9611uxc *lt9611uxc = i2c_get_clientdata(client);
 984
 985         disable_irq(client->irq);
 986         cancel_work_sync(&lt9611uxc->work);
 987         lt9611uxc_audio_exit(lt9611uxc);
 988         drm_bridge_remove(&lt9611uxc->bridge);
 989
 990         mutex_destroy(&lt9611uxc->ocm_lock);
 991
 992         regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
 993
 994         of_node_put(lt9611uxc->dsi1_node);
 995         of_node_put(lt9611uxc->dsi0_node);
 996
 997         return 0;
 998 }
 999
1000 static struct i2c_device_id lt9611uxc_id[] = {
1001         { "lontium,lt9611uxc", 0 },
1002         { /* sentinel */ }
1003 };
1004
1005 static const struct of_device_id lt9611uxc_match_table[] = {
1006         { .compatible = "lontium,lt9611uxc" },
1007         { /* sentinel */ }
1008 };
1009 MODULE_DEVICE_TABLE(of, lt9611uxc_match_table);
1010
1011 static struct i2c_driver lt9611uxc_driver = {
1012         .driver = {
1013                 .name = "lt9611uxc",
1014                 .of_match_table = lt9611uxc_match_table,
1015                 .dev_groups = lt9611uxc_attr_groups,
1016         },
1017         .probe = lt9611uxc_probe,
1018         .remove = lt9611uxc_remove,
1019         .id_table = lt9611uxc_id,
1020 };
1021 module_i2c_driver(lt9611uxc_driver);
1022
1023 MODULE_AUTHOR("Dmitry Baryshkov <dmitry.baryshkov@linaro.org>");
1024 MODULE_LICENSE("GPL v2");