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/interrupt.h>
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/of_graph.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regmap.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/wait.h>
  17 #include <linux/workqueue.h>
  18
  19 #include <sound/hdmi-codec.h>
  20
  21 #include <drm/drm_atomic_helper.h>
  22 #include <drm/drm_bridge.h>
  23 #include <drm/drm_mipi_dsi.h>
  24 #include <drm/drm_print.h>
  25 #include <drm/drm_probe_helper.h>
  26
  27 #define EDID_BLOCK_SIZE 128
  28 #define EDID_NUM_BLOCKS 2
  29
  30 struct lt9611uxc {
  31         struct device *dev;
  32         struct drm_bridge bridge;
  33         struct drm_connector connector;
  34
  35         struct regmap *regmap;
  36         /* Protects all accesses to registers by stopping the on-chip MCU */
  37         struct mutex ocm_lock;
  38
  39         struct wait_queue_head wq;
  40         struct work_struct work;
  41
  42         struct device_node *dsi0_node;
  43         struct device_node *dsi1_node;
  44         struct mipi_dsi_device *dsi0;
  45         struct mipi_dsi_device *dsi1;
  46         struct platform_device *audio_pdev;
  47
  48         struct gpio_desc *reset_gpio;
  49         struct gpio_desc *enable_gpio;
  50
  51         struct regulator_bulk_data supplies[2];
  52
  53         struct i2c_client *client;
  54
  55         bool hpd_supported;
  56         bool edid_read;
  57         /* can be accessed from different threads, so protect this with ocm_lock */
  58         bool hdmi_connected;
  59         uint8_t fw_version;
  60 };
  61
  62 #define LT9611_PAGE_CONTROL     0xff
  63
  64 static const struct regmap_range_cfg lt9611uxc_ranges[] = {
  65         {
  66                 .name = "register_range",
  67                 .range_min =  0,
  68                 .range_max = 0xd0ff,
  69                 .selector_reg = LT9611_PAGE_CONTROL,
  70                 .selector_mask = 0xff,
  71                 .selector_shift = 0,
  72                 .window_start = 0,
  73                 .window_len = 0x100,
  74         },
  75 };
  76
  77 static const struct regmap_config lt9611uxc_regmap_config = {
  78         .reg_bits = 8,
  79         .val_bits = 8,
  80         .max_register = 0xffff,
  81         .ranges = lt9611uxc_ranges,
  82         .num_ranges = ARRAY_SIZE(lt9611uxc_ranges),
  83 };
  84
  85 struct lt9611uxc_mode {
  86         u16 hdisplay;
  87         u16 vdisplay;
  88         u8 vrefresh;
  89 };
  90
  91 /*
  92  * This chip supports only a fixed set of modes.
  93  * Enumerate them here to check whether the mode is supported.
  94  */
  95 static struct lt9611uxc_mode lt9611uxc_modes[] = {
  96         { 1920, 1080, 60 },
  97         { 1920, 1080, 30 },
  98         { 1920, 1080, 25 },
  99         { 1366, 768, 60 },
 100         { 1360, 768, 60 },
 101         { 1280, 1024, 60 },
 102         { 1280, 800, 60 },
 103         { 1280, 720, 60 },
 104         { 1280, 720, 50 },
 105         { 1280, 720, 30 },
 106         { 1152, 864, 60 },
 107         { 1024, 768, 60 },
 108         { 800, 600, 60 },
 109         { 720, 576, 50 },
 110         { 720, 480, 60 },
 111         { 640, 480, 60 },
 112 };
 113
 114 static struct lt9611uxc *bridge_to_lt9611uxc(struct drm_bridge *bridge)
 115 {
 116         return container_of(bridge, struct lt9611uxc, bridge);
 117 }
 118
 119 static struct lt9611uxc *connector_to_lt9611uxc(struct drm_connector *connector)
 120 {
 121         return container_of(connector, struct lt9611uxc, connector);
 122 }
 123
 124 static void lt9611uxc_lock(struct lt9611uxc *lt9611uxc)
 125 {
 126         mutex_lock(&lt9611uxc->ocm_lock);
 127         regmap_write(lt9611uxc->regmap, 0x80ee, 0x01);
 128 }
 129
 130 static void lt9611uxc_unlock(struct lt9611uxc *lt9611uxc)
 131 {
 132         regmap_write(lt9611uxc->regmap, 0x80ee, 0x00);
 133         msleep(50);
 134         mutex_unlock(&lt9611uxc->ocm_lock);
 135 }
 136
 137 static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id)
 138 {
 139         struct lt9611uxc *lt9611uxc = dev_id;
 140         unsigned int irq_status = 0;
 141         unsigned int hpd_status = 0;
 142
 143         lt9611uxc_lock(lt9611uxc);
 144
 145         regmap_read(lt9611uxc->regmap, 0xb022, &irq_status);
 146         regmap_read(lt9611uxc->regmap, 0xb023, &hpd_status);
 147         if (irq_status)
 148                 regmap_write(lt9611uxc->regmap, 0xb022, 0);
 149
 150         if (irq_status & BIT(0)) {
 151                 lt9611uxc->edid_read = !!(hpd_status & BIT(0));
 152                 wake_up_all(&lt9611uxc->wq);
 153         }
 154
 155         if (irq_status & BIT(1)) {
 156                 lt9611uxc->hdmi_connected = hpd_status & BIT(1);
 157                 schedule_work(&lt9611uxc->work);
 158         }
 159
 160         lt9611uxc_unlock(lt9611uxc);
 161
 162         return IRQ_HANDLED;
 163 }
 164
 165 static void lt9611uxc_hpd_work(struct work_struct *work)
 166 {
 167         struct lt9611uxc *lt9611uxc = container_of(work, struct lt9611uxc, work);
 168         bool connected;
 169
 170         if (lt9611uxc->connector.dev)
 171                 drm_kms_helper_hotplug_event(lt9611uxc->connector.dev);
 172         else {
 173
 174                 mutex_lock(&lt9611uxc->ocm_lock);
 175                 connected = lt9611uxc->hdmi_connected;
 176                 mutex_unlock(&lt9611uxc->ocm_lock);
 177
 178                 drm_bridge_hpd_notify(&lt9611uxc->bridge,
 179                                       connected ?
 180                                       connector_status_connected :
 181                                       connector_status_disconnected);
 182         }
 183 }
 184
 185 static void lt9611uxc_reset(struct lt9611uxc *lt9611uxc)
 186 {
 187         gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
 188         msleep(20);
 189
 190         gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 0);
 191         msleep(20);
 192
 193         gpiod_set_value_cansleep(lt9611uxc->reset_gpio, 1);
 194         msleep(300);
 195 }
 196
 197 static void lt9611uxc_assert_5v(struct lt9611uxc *lt9611uxc)
 198 {
 199         if (!lt9611uxc->enable_gpio)
 200                 return;
 201
 202         gpiod_set_value_cansleep(lt9611uxc->enable_gpio, 1);
 203         msleep(20);
 204 }
 205
 206 static int lt9611uxc_regulator_init(struct lt9611uxc *lt9611uxc)
 207 {
 208         int ret;
 209
 210         lt9611uxc->supplies[0].supply = "vdd";
 211         lt9611uxc->supplies[1].supply = "vcc";
 212
 213         ret = devm_regulator_bulk_get(lt9611uxc->dev, 2, lt9611uxc->supplies);
 214         if (ret < 0)
 215                 return ret;
 216
 217         return regulator_set_load(lt9611uxc->supplies[0].consumer, 200000);
 218 }
 219
 220 static int lt9611uxc_regulator_enable(struct lt9611uxc *lt9611uxc)
 221 {
 222         int ret;
 223
 224         ret = regulator_enable(lt9611uxc->supplies[0].consumer);
 225         if (ret < 0)
 226                 return ret;
 227
 228         usleep_range(1000, 10000); /* 50000 according to dtsi */
 229
 230         ret = regulator_enable(lt9611uxc->supplies[1].consumer);
 231         if (ret < 0) {
 232                 regulator_disable(lt9611uxc->supplies[0].consumer);
 233                 return ret;
 234         }
 235
 236         return 0;
 237 }
 238
 239 static struct lt9611uxc_mode *lt9611uxc_find_mode(const struct drm_display_mode *mode)
 240 {
 241         int i;
 242
 243         for (i = 0; i < ARRAY_SIZE(lt9611uxc_modes); i++) {
 244                 if (lt9611uxc_modes[i].hdisplay == mode->hdisplay &&
 245                     lt9611uxc_modes[i].vdisplay == mode->vdisplay &&
 246                     lt9611uxc_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
 247                         return &lt9611uxc_modes[i];
 248                 }
 249         }
 250
 251         return NULL;
 252 }
 253
 254 static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
 255                                                     struct device_node *dsi_node)
 256 {
 257         const struct mipi_dsi_device_info info = { "lt9611uxc", 0, NULL };
 258         struct mipi_dsi_device *dsi;
 259         struct mipi_dsi_host *host;
 260         int ret;
 261
 262         host = of_find_mipi_dsi_host_by_node(dsi_node);
 263         if (!host) {
 264                 dev_err(lt9611uxc->dev, "failed to find dsi host\n");
 265                 return ERR_PTR(-EPROBE_DEFER);
 266         }
 267
 268         dsi = mipi_dsi_device_register_full(host, &info);
 269         if (IS_ERR(dsi)) {
 270                 dev_err(lt9611uxc->dev, "failed to create dsi device\n");
 271                 return dsi;
 272         }
 273
 274         dsi->lanes = 4;
 275         dsi->format = MIPI_DSI_FMT_RGB888;
 276         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
 277                           MIPI_DSI_MODE_VIDEO_HSE;
 278
 279         ret = mipi_dsi_attach(dsi);
 280         if (ret < 0) {
 281                 dev_err(lt9611uxc->dev, "failed to attach dsi to host\n");
 282                 mipi_dsi_device_unregister(dsi);
 283                 return ERR_PTR(ret);
 284         }
 285
 286         return dsi;
 287 }
 288
 289 static int lt9611uxc_connector_get_modes(struct drm_connector *connector)
 290 {
 291         struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
 292         unsigned int count;
 293         struct edid *edid;
 294
 295         edid = lt9611uxc->bridge.funcs->get_edid(&lt9611uxc->bridge, connector);
 296         drm_connector_update_edid_property(connector, edid);
 297         count = drm_add_edid_modes(connector, edid);
 298         kfree(edid);
 299
 300         return count;
 301 }
 302
 303 static enum drm_connector_status lt9611uxc_connector_detect(struct drm_connector *connector,
 304                                                             bool force)
 305 {
 306         struct lt9611uxc *lt9611uxc = connector_to_lt9611uxc(connector);
 307
 308         return lt9611uxc->bridge.funcs->detect(&lt9611uxc->bridge);
 309 }
 310
 311 static enum drm_mode_status lt9611uxc_connector_mode_valid(struct drm_connector *connector,
 312                                                            struct drm_display_mode *mode)
 313 {
 314         struct lt9611uxc_mode *lt9611uxc_mode = lt9611uxc_find_mode(mode);
 315
 316         return lt9611uxc_mode ? MODE_OK : MODE_BAD;
 317 }
 318
 319 static const struct drm_connector_helper_funcs lt9611uxc_bridge_connector_helper_funcs = {
 320         .get_modes = lt9611uxc_connector_get_modes,
 321         .mode_valid = lt9611uxc_connector_mode_valid,
 322 };
 323
 324 static const struct drm_connector_funcs lt9611uxc_bridge_connector_funcs = {
 325         .fill_modes = drm_helper_probe_single_connector_modes,
 326         .detect = lt9611uxc_connector_detect,
 327         .destroy = drm_connector_cleanup,
 328         .reset = drm_atomic_helper_connector_reset,
 329         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 330         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 331 };
 332
 333 static int lt9611uxc_connector_init(struct drm_bridge *bridge, struct lt9611uxc *lt9611uxc)
 334 {
 335         int ret;
 336
 337         if (!bridge->encoder) {
 338                 DRM_ERROR("Parent encoder object not found");
 339                 return -ENODEV;
 340         }
 341
 342         drm_connector_helper_add(&lt9611uxc->connector,
 343                                  &lt9611uxc_bridge_connector_helper_funcs);
 344         ret = drm_connector_init(bridge->dev, &lt9611uxc->connector,
 345                                  &lt9611uxc_bridge_connector_funcs,
 346                                  DRM_MODE_CONNECTOR_HDMIA);
 347         if (ret) {
 348                 DRM_ERROR("Failed to initialize connector with drm\n");
 349                 return ret;
 350         }
 351
 352         return drm_connector_attach_encoder(&lt9611uxc->connector, bridge->encoder);
 353 }
 354
 355 static void lt9611uxc_bridge_detach(struct drm_bridge *bridge)
 356 {
 357         struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
 358
 359         if (lt9611uxc->dsi1) {
 360                 mipi_dsi_detach(lt9611uxc->dsi1);
 361                 mipi_dsi_device_unregister(lt9611uxc->dsi1);
 362         }
 363
 364         mipi_dsi_detach(lt9611uxc->dsi0);
 365         mipi_dsi_device_unregister(lt9611uxc->dsi0);
 366 }
 367
 368 static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
 369                                    enum drm_bridge_attach_flags flags)
 370 {
 371         struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
 372         int ret;
 373
 374         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
 375                 ret = lt9611uxc_connector_init(bridge, lt9611uxc);
 376                 if (ret < 0)
 377                         return ret;
 378         }
 379
 380         /* Attach primary DSI */
 381         lt9611uxc->dsi0 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi0_node);
 382         if (IS_ERR(lt9611uxc->dsi0))
 383                 return PTR_ERR(lt9611uxc->dsi0);
 384
 385         /* Attach secondary DSI, if specified */
 386         if (lt9611uxc->dsi1_node) {
 387                 lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi1_node);
 388                 if (IS_ERR(lt9611uxc->dsi1)) {
 389                         ret = PTR_ERR(lt9611uxc->dsi1);
 390                         goto err_unregister_dsi0;
 391                 }
 392         }
 393
 394         return 0;
 395
 396 err_unregister_dsi0:
 397         mipi_dsi_detach(lt9611uxc->dsi0);
 398         mipi_dsi_device_unregister(lt9611uxc->dsi0);
 399
 400         return ret;
 401 }
 402
 403 static enum drm_mode_status
 404 lt9611uxc_bridge_mode_valid(struct drm_bridge *bridge,
 405                             const struct drm_display_info *info,
 406                             const struct drm_display_mode *mode)
 407 {
 408         struct lt9611uxc_mode *lt9611uxc_mode;
 409
 410         lt9611uxc_mode = lt9611uxc_find_mode(mode);
 411
 412         return lt9611uxc_mode ? MODE_OK : MODE_BAD;
 413 }
 414
 415 static void lt9611uxc_video_setup(struct lt9611uxc *lt9611uxc,
 416                                   const struct drm_display_mode *mode)
 417 {
 418         u32 h_total, hactive, hsync_len, hfront_porch;
 419         u32 v_total, vactive, vsync_len, vfront_porch;
 420
 421         h_total = mode->htotal;
 422         v_total = mode->vtotal;
 423
 424         hactive = mode->hdisplay;
 425         hsync_len = mode->hsync_end - mode->hsync_start;
 426         hfront_porch = mode->hsync_start - mode->hdisplay;
 427
 428         vactive = mode->vdisplay;
 429         vsync_len = mode->vsync_end - mode->vsync_start;
 430         vfront_porch = mode->vsync_start - mode->vdisplay;
 431
 432         regmap_write(lt9611uxc->regmap, 0xd00d, (u8)(v_total / 256));
 433         regmap_write(lt9611uxc->regmap, 0xd00e, (u8)(v_total % 256));
 434
 435         regmap_write(lt9611uxc->regmap, 0xd00f, (u8)(vactive / 256));
 436         regmap_write(lt9611uxc->regmap, 0xd010, (u8)(vactive % 256));
 437
 438         regmap_write(lt9611uxc->regmap, 0xd011, (u8)(h_total / 256));
 439         regmap_write(lt9611uxc->regmap, 0xd012, (u8)(h_total % 256));
 440
 441         regmap_write(lt9611uxc->regmap, 0xd013, (u8)(hactive / 256));
 442         regmap_write(lt9611uxc->regmap, 0xd014, (u8)(hactive % 256));
 443
 444         regmap_write(lt9611uxc->regmap, 0xd015, (u8)(vsync_len % 256));
 445
 446         regmap_update_bits(lt9611uxc->regmap, 0xd016, 0xf, (u8)(hsync_len / 256));
 447         regmap_write(lt9611uxc->regmap, 0xd017, (u8)(hsync_len % 256));
 448
 449         regmap_update_bits(lt9611uxc->regmap, 0xd018, 0xf, (u8)(vfront_porch / 256));
 450         regmap_write(lt9611uxc->regmap, 0xd019, (u8)(vfront_porch % 256));
 451
 452         regmap_update_bits(lt9611uxc->regmap, 0xd01a, 0xf, (u8)(hfront_porch / 256));
 453         regmap_write(lt9611uxc->regmap, 0xd01b, (u8)(hfront_porch % 256));
 454 }
 455
 456 static void lt9611uxc_bridge_mode_set(struct drm_bridge *bridge,
 457                                       const struct drm_display_mode *mode,
 458                                       const struct drm_display_mode *adj_mode)
 459 {
 460         struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
 461
 462         lt9611uxc_lock(lt9611uxc);
 463         lt9611uxc_video_setup(lt9611uxc, mode);
 464         lt9611uxc_unlock(lt9611uxc);
 465 }
 466
 467 static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *bridge)
 468 {
 469         struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
 470         unsigned int reg_val = 0;
 471         int ret;
 472         bool connected = true;
 473
 474         lt9611uxc_lock(lt9611uxc);
 475
 476         if (lt9611uxc->hpd_supported) {
 477                 ret = regmap_read(lt9611uxc->regmap, 0xb023, &reg_val);
 478
 479                 if (ret)
 480                         dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret);
 481                 else
 482                         connected  = reg_val & BIT(1);
 483         }
 484         lt9611uxc->hdmi_connected = connected;
 485
 486         lt9611uxc_unlock(lt9611uxc);
 487
 488         return connected ?  connector_status_connected :
 489                                 connector_status_disconnected;
 490 }
 491
 492 static int lt9611uxc_wait_for_edid(struct lt9611uxc *lt9611uxc)
 493 {
 494         return wait_event_interruptible_timeout(lt9611uxc->wq, lt9611uxc->edid_read,
 495                         msecs_to_jiffies(500));
 496 }
 497
 498 static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
 499 {
 500         struct lt9611uxc *lt9611uxc = data;
 501         int ret;
 502
 503         if (len > EDID_BLOCK_SIZE)
 504                 return -EINVAL;
 505
 506         if (block >= EDID_NUM_BLOCKS)
 507                 return -EINVAL;
 508
 509         lt9611uxc_lock(lt9611uxc);
 510
 511         regmap_write(lt9611uxc->regmap, 0xb00b, 0x10);
 512
 513         regmap_write(lt9611uxc->regmap, 0xb00a, block * EDID_BLOCK_SIZE);
 514
 515         ret = regmap_noinc_read(lt9611uxc->regmap, 0xb0b0, buf, len);
 516         if (ret)
 517                 dev_err(lt9611uxc->dev, "edid read failed: %d\n", ret);
 518
 519         lt9611uxc_unlock(lt9611uxc);
 520
 521         return 0;
 522 };
 523
 524 static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
 525                                               struct drm_connector *connector)
 526 {
 527         struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
 528         int ret;
 529
 530         ret = lt9611uxc_wait_for_edid(lt9611uxc);
 531         if (ret < 0) {
 532                 dev_err(lt9611uxc->dev, "wait for EDID failed: %d\n", ret);
 533                 return NULL;
 534         } else if (ret == 0) {
 535                 dev_err(lt9611uxc->dev, "wait for EDID timeout\n");
 536                 return NULL;
 537         }
 538
 539         return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc);
 540 }
 541
 542 static const struct drm_bridge_funcs lt9611uxc_bridge_funcs = {
 543         .attach = lt9611uxc_bridge_attach,
 544         .detach = lt9611uxc_bridge_detach,
 545         .mode_valid = lt9611uxc_bridge_mode_valid,
 546         .mode_set = lt9611uxc_bridge_mode_set,
 547         .detect = lt9611uxc_bridge_detect,
 548         .get_edid = lt9611uxc_bridge_get_edid,
 549 };
 550
 551 static int lt9611uxc_parse_dt(struct device *dev,
 552                               struct lt9611uxc *lt9611uxc)
 553 {
 554         lt9611uxc->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
 555         if (!lt9611uxc->dsi0_node) {
 556                 dev_err(lt9611uxc->dev, "failed to get remote node for primary dsi\n");
 557                 return -ENODEV;
 558         }
 559
 560         lt9611uxc->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
 561
 562         return 0;
 563 }
 564
 565 static int lt9611uxc_gpio_init(struct lt9611uxc *lt9611uxc)
 566 {
 567         struct device *dev = lt9611uxc->dev;
 568
 569         lt9611uxc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 570         if (IS_ERR(lt9611uxc->reset_gpio)) {
 571                 dev_err(dev, "failed to acquire reset gpio\n");
 572                 return PTR_ERR(lt9611uxc->reset_gpio);
 573         }
 574
 575         lt9611uxc->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
 576         if (IS_ERR(lt9611uxc->enable_gpio)) {
 577                 dev_err(dev, "failed to acquire enable gpio\n");
 578                 return PTR_ERR(lt9611uxc->enable_gpio);
 579         }
 580
 581         return 0;
 582 }
 583
 584 static int lt9611uxc_read_device_rev(struct lt9611uxc *lt9611uxc)
 585 {
 586         unsigned int rev0, rev1, rev2;
 587         int ret;
 588
 589         lt9611uxc_lock(lt9611uxc);
 590
 591         ret = regmap_read(lt9611uxc->regmap, 0x8100, &rev0);
 592         ret |= regmap_read(lt9611uxc->regmap, 0x8101, &rev1);
 593         ret |= regmap_read(lt9611uxc->regmap, 0x8102, &rev2);
 594         if (ret)
 595                 dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
 596         else
 597                 dev_info(lt9611uxc->dev, "LT9611 revision: 0x%02x.%02x.%02x\n", rev0, rev1, rev2);
 598
 599         lt9611uxc_unlock(lt9611uxc);
 600
 601         return ret;
 602 }
 603
 604 static int lt9611uxc_read_version(struct lt9611uxc *lt9611uxc)
 605 {
 606         unsigned int rev;
 607         int ret;
 608
 609         lt9611uxc_lock(lt9611uxc);
 610
 611         ret = regmap_read(lt9611uxc->regmap, 0xb021, &rev);
 612         if (ret)
 613                 dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
 614         else
 615                 dev_info(lt9611uxc->dev, "LT9611 version: 0x%02x\n", rev);
 616
 617         lt9611uxc_unlock(lt9611uxc);
 618
 619         return ret < 0 ? ret : rev;
 620 }
 621
 622 static int lt9611uxc_hdmi_hw_params(struct device *dev, void *data,
 623                                     struct hdmi_codec_daifmt *fmt,
 624                                     struct hdmi_codec_params *hparms)
 625 {
 626         /*
 627          * LT9611UXC will automatically detect rate and sample size, so no need
 628          * to setup anything here.
 629          */
 630         return 0;
 631 }
 632
 633 static void lt9611uxc_audio_shutdown(struct device *dev, void *data)
 634 {
 635 }
 636
 637 static int lt9611uxc_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
 638                                          struct device_node *endpoint)
 639 {
 640         struct of_endpoint of_ep;
 641         int ret;
 642
 643         ret = of_graph_parse_endpoint(endpoint, &of_ep);
 644         if (ret < 0)
 645                 return ret;
 646
 647         /*
 648          * HDMI sound should be located as reg = <2>
 649          * Then, it is sound port 0
 650          */
 651         if (of_ep.port == 2)
 652                 return 0;
 653
 654         return -EINVAL;
 655 }
 656
 657 static const struct hdmi_codec_ops lt9611uxc_codec_ops = {
 658         .hw_params      = lt9611uxc_hdmi_hw_params,
 659         .audio_shutdown = lt9611uxc_audio_shutdown,
 660         .get_dai_id     = lt9611uxc_hdmi_i2s_get_dai_id,
 661 };
 662
 663 static int lt9611uxc_audio_init(struct device *dev, struct lt9611uxc *lt9611uxc)
 664 {
 665         struct hdmi_codec_pdata codec_data = {
 666                 .ops = &lt9611uxc_codec_ops,
 667                 .max_i2s_channels = 2,
 668                 .i2s = 1,
 669                 .data = lt9611uxc,
 670         };
 671
 672         lt9611uxc->audio_pdev =
 673                 platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
 674                                               PLATFORM_DEVID_AUTO,
 675                                               &codec_data, sizeof(codec_data));
 676
 677         return PTR_ERR_OR_ZERO(lt9611uxc->audio_pdev);
 678 }
 679
 680 static void lt9611uxc_audio_exit(struct lt9611uxc *lt9611uxc)
 681 {
 682         if (lt9611uxc->audio_pdev) {
 683                 platform_device_unregister(lt9611uxc->audio_pdev);
 684                 lt9611uxc->audio_pdev = NULL;
 685         }
 686 }
 687
 688 #define LT9611UXC_FW_PAGE_SIZE 32
 689 static void lt9611uxc_firmware_write_page(struct lt9611uxc *lt9611uxc, u16 addr, const u8 *buf)
 690 {
 691         struct reg_sequence seq_write_prepare[] = {
 692                 REG_SEQ0(0x805a, 0x04),
 693                 REG_SEQ0(0x805a, 0x00),
 694
 695                 REG_SEQ0(0x805e, 0xdf),
 696                 REG_SEQ0(0x805a, 0x20),
 697                 REG_SEQ0(0x805a, 0x00),
 698                 REG_SEQ0(0x8058, 0x21),
 699         };
 700
 701         struct reg_sequence seq_write_addr[] = {
 702                 REG_SEQ0(0x805b, (addr >> 16) & 0xff),
 703                 REG_SEQ0(0x805c, (addr >> 8) & 0xff),
 704                 REG_SEQ0(0x805d, addr & 0xff),
 705                 REG_SEQ0(0x805a, 0x10),
 706                 REG_SEQ0(0x805a, 0x00),
 707         };
 708
 709         regmap_write(lt9611uxc->regmap, 0x8108, 0xbf);
 710         msleep(20);
 711         regmap_write(lt9611uxc->regmap, 0x8108, 0xff);
 712         msleep(20);
 713         regmap_multi_reg_write(lt9611uxc->regmap, seq_write_prepare, ARRAY_SIZE(seq_write_prepare));
 714         regmap_noinc_write(lt9611uxc->regmap, 0x8059, buf, LT9611UXC_FW_PAGE_SIZE);
 715         regmap_multi_reg_write(lt9611uxc->regmap, seq_write_addr, ARRAY_SIZE(seq_write_addr));
 716         msleep(20);
 717 }
 718
 719 static void lt9611uxc_firmware_read_page(struct lt9611uxc *lt9611uxc, u16 addr, char *buf)
 720 {
 721         struct reg_sequence seq_read_page[] = {
 722                 REG_SEQ0(0x805a, 0xa0),
 723                 REG_SEQ0(0x805a, 0x80),
 724                 REG_SEQ0(0x805b, (addr >> 16) & 0xff),
 725                 REG_SEQ0(0x805c, (addr >> 8) & 0xff),
 726                 REG_SEQ0(0x805d, addr & 0xff),
 727                 REG_SEQ0(0x805a, 0x90),
 728                 REG_SEQ0(0x805a, 0x80),
 729                 REG_SEQ0(0x8058, 0x21),
 730         };
 731
 732         regmap_multi_reg_write(lt9611uxc->regmap, seq_read_page, ARRAY_SIZE(seq_read_page));
 733         regmap_noinc_read(lt9611uxc->regmap, 0x805f, buf, LT9611UXC_FW_PAGE_SIZE);
 734 }
 735
 736 static char *lt9611uxc_firmware_read(struct lt9611uxc *lt9611uxc, size_t size)
 737 {
 738         struct reg_sequence seq_read_setup[] = {
 739                 REG_SEQ0(0x805a, 0x84),
 740                 REG_SEQ0(0x805a, 0x80),
 741         };
 742
 743         char *readbuf;
 744         u16 offset;
 745
 746         readbuf = kzalloc(ALIGN(size, 32), GFP_KERNEL);
 747         if (!readbuf)
 748                 return NULL;
 749
 750         regmap_multi_reg_write(lt9611uxc->regmap, seq_read_setup, ARRAY_SIZE(seq_read_setup));
 751
 752         for (offset = 0;
 753              offset < size;
 754              offset += LT9611UXC_FW_PAGE_SIZE)
 755                 lt9611uxc_firmware_read_page(lt9611uxc, offset, &readbuf[offset]);
 756
 757         return readbuf;
 758 }
 759
 760 static int lt9611uxc_firmware_update(struct lt9611uxc *lt9611uxc)
 761 {
 762         int ret;
 763         u16 offset;
 764         size_t remain;
 765         char *readbuf;
 766         const struct firmware *fw;
 767
 768         struct reg_sequence seq_setup[] = {
 769                 REG_SEQ0(0x805e, 0xdf),
 770                 REG_SEQ0(0x8058, 0x00),
 771                 REG_SEQ0(0x8059, 0x50),
 772                 REG_SEQ0(0x805a, 0x10),
 773                 REG_SEQ0(0x805a, 0x00),
 774         };
 775
 776
 777         struct reg_sequence seq_block_erase[] = {
 778                 REG_SEQ0(0x805a, 0x04),
 779                 REG_SEQ0(0x805a, 0x00),
 780                 REG_SEQ0(0x805b, 0x00),
 781                 REG_SEQ0(0x805c, 0x00),
 782                 REG_SEQ0(0x805d, 0x00),
 783                 REG_SEQ0(0x805a, 0x01),
 784                 REG_SEQ0(0x805a, 0x00),
 785         };
 786
 787         ret = request_firmware(&fw, "lt9611uxc_fw.bin", lt9611uxc->dev);
 788         if (ret < 0)
 789                 return ret;
 790
 791         dev_info(lt9611uxc->dev, "Updating firmware\n");
 792         lt9611uxc_lock(lt9611uxc);
 793
 794         regmap_multi_reg_write(lt9611uxc->regmap, seq_setup, ARRAY_SIZE(seq_setup));
 795
 796         /*
 797          * Need erase block 2 timess here. Sometimes, block erase can fail.
 798          * This is a workaroud.
 799          */
 800         regmap_multi_reg_write(lt9611uxc->regmap, seq_block_erase, ARRAY_SIZE(seq_block_erase));
 801         msleep(3000);
 802         regmap_multi_reg_write(lt9611uxc->regmap, seq_block_erase, ARRAY_SIZE(seq_block_erase));
 803         msleep(3000);
 804
 805         for (offset = 0, remain = fw->size;
 806              remain >= LT9611UXC_FW_PAGE_SIZE;
 807              offset += LT9611UXC_FW_PAGE_SIZE, remain -= LT9611UXC_FW_PAGE_SIZE)
 808                 lt9611uxc_firmware_write_page(lt9611uxc, offset, fw->data + offset);
 809
 810         if (remain > 0) {
 811                 char buf[LT9611UXC_FW_PAGE_SIZE];
 812
 813                 memset(buf, 0xff, LT9611UXC_FW_PAGE_SIZE);
 814                 memcpy(buf, fw->data + offset, remain);
 815                 lt9611uxc_firmware_write_page(lt9611uxc, offset, buf);
 816         }
 817         msleep(20);
 818
 819         readbuf = lt9611uxc_firmware_read(lt9611uxc, fw->size);
 820         if (!readbuf) {
 821                 ret = -ENOMEM;
 822                 goto out;
 823         }
 824
 825         if (!memcmp(readbuf, fw->data, fw->size)) {
 826                 dev_err(lt9611uxc->dev, "Firmware update failed\n");
 827                 print_hex_dump(KERN_ERR, "fw: ", DUMP_PREFIX_OFFSET, 16, 1, readbuf, fw->size, false);
 828                 ret = -EINVAL;
 829         } else {
 830                 dev_info(lt9611uxc->dev, "Firmware updates successfully\n");
 831                 ret = 0;
 832         }
 833         kfree(readbuf);
 834
 835 out:
 836         lt9611uxc_unlock(lt9611uxc);
 837         lt9611uxc_reset(lt9611uxc);
 838         release_firmware(fw);
 839
 840         return ret;
 841 }
 842
 843 static ssize_t lt9611uxc_firmware_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
 844 {
 845         struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
 846         int ret;
 847
 848         ret = lt9611uxc_firmware_update(lt9611uxc);
 849         if (ret < 0)
 850                 return ret;
 851         return len;
 852 }
 853
 854 static ssize_t lt9611uxc_firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
 855 {
 856         struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
 857
 858         return snprintf(buf, PAGE_SIZE, "%02x\n", lt9611uxc->fw_version);
 859 }
 860
 861 static DEVICE_ATTR_RW(lt9611uxc_firmware);
 862
 863 static struct attribute *lt9611uxc_attrs[] = {
 864         &dev_attr_lt9611uxc_firmware.attr,
 865         NULL,
 866 };
 867
 868 static const struct attribute_group lt9611uxc_attr_group = {
 869         .attrs = lt9611uxc_attrs,
 870 };
 871
 872 static const struct attribute_group *lt9611uxc_attr_groups[] = {
 873         &lt9611uxc_attr_group,
 874         NULL,
 875 };
 876
 877 static int lt9611uxc_probe(struct i2c_client *client,
 878                            const struct i2c_device_id *id)
 879 {
 880         struct lt9611uxc *lt9611uxc;
 881         struct device *dev = &client->dev;
 882         int ret;
 883         bool fw_updated = false;
 884
 885         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 886                 dev_err(dev, "device doesn't support I2C\n");
 887                 return -ENODEV;
 888         }
 889
 890         lt9611uxc = devm_kzalloc(dev, sizeof(*lt9611uxc), GFP_KERNEL);
 891         if (!lt9611uxc)
 892                 return -ENOMEM;
 893
 894         lt9611uxc->dev = &client->dev;
 895         lt9611uxc->client = client;
 896         mutex_init(&lt9611uxc->ocm_lock);
 897
 898         lt9611uxc->regmap = devm_regmap_init_i2c(client, &lt9611uxc_regmap_config);
 899         if (IS_ERR(lt9611uxc->regmap)) {
 900                 dev_err(lt9611uxc->dev, "regmap i2c init failed\n");
 901                 return PTR_ERR(lt9611uxc->regmap);
 902         }
 903
 904         ret = lt9611uxc_parse_dt(&client->dev, lt9611uxc);
 905         if (ret) {
 906                 dev_err(dev, "failed to parse device tree\n");
 907                 return ret;
 908         }
 909
 910         ret = lt9611uxc_gpio_init(lt9611uxc);
 911         if (ret < 0)
 912                 goto err_of_put;
 913
 914         ret = lt9611uxc_regulator_init(lt9611uxc);
 915         if (ret < 0)
 916                 goto err_of_put;
 917
 918         lt9611uxc_assert_5v(lt9611uxc);
 919
 920         ret = lt9611uxc_regulator_enable(lt9611uxc);
 921         if (ret)
 922                 goto err_of_put;
 923
 924         lt9611uxc_reset(lt9611uxc);
 925
 926         ret = lt9611uxc_read_device_rev(lt9611uxc);
 927         if (ret) {
 928                 dev_err(dev, "failed to read chip rev\n");
 929                 goto err_disable_regulators;
 930         }
 931
 932 retry:
 933         ret = lt9611uxc_read_version(lt9611uxc);
 934         if (ret < 0) {
 935                 dev_err(dev, "failed to read FW version\n");
 936                 goto err_disable_regulators;
 937         } else if (ret == 0) {
 938                 if (!fw_updated) {
 939                         fw_updated = true;
 940                         dev_err(dev, "FW version 0, enforcing firmware update\n");
 941                         ret = lt9611uxc_firmware_update(lt9611uxc);
 942                         if (ret < 0)
 943                                 goto err_disable_regulators;
 944                         else
 945                                 goto retry;
 946                 } else {
 947                         dev_err(dev, "FW version 0, update failed\n");
 948                         ret = -EOPNOTSUPP;
 949                         goto err_disable_regulators;
 950                 }
 951         } else if (ret < 0x40) {
 952                 dev_info(dev, "FW version 0x%x, HPD not supported\n", ret);
 953         } else {
 954                 lt9611uxc->hpd_supported = true;
 955         }
 956         lt9611uxc->fw_version = ret;
 957
 958         init_waitqueue_head(&lt9611uxc->wq);
 959         INIT_WORK(&lt9611uxc->work, lt9611uxc_hpd_work);
 960
 961         ret = devm_request_threaded_irq(dev, client->irq, NULL,
 962                                         lt9611uxc_irq_thread_handler,
 963                                         IRQF_ONESHOT, "lt9611uxc", lt9611uxc);
 964         if (ret) {
 965                 dev_err(dev, "failed to request irq\n");
 966                 goto err_disable_regulators;
 967         }
 968
 969         i2c_set_clientdata(client, lt9611uxc);
 970
 971         lt9611uxc->bridge.funcs = &lt9611uxc_bridge_funcs;
 972         lt9611uxc->bridge.of_node = client->dev.of_node;
 973         lt9611uxc->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
 974         if (lt9611uxc->hpd_supported)
 975                 lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_HPD;
 976         lt9611uxc->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
 977
 978         drm_bridge_add(&lt9611uxc->bridge);
 979
 980         return lt9611uxc_audio_init(dev, lt9611uxc);
 981
 982 err_disable_regulators:
 983         regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
 984
 985 err_of_put:
 986         of_node_put(lt9611uxc->dsi1_node);
 987         of_node_put(lt9611uxc->dsi0_node);
 988
 989         return ret;
 990 }
 991
 992 static int lt9611uxc_remove(struct i2c_client *client)
 993 {
 994         struct lt9611uxc *lt9611uxc = i2c_get_clientdata(client);
 995
 996         disable_irq(client->irq);
 997         flush_scheduled_work();
 998         lt9611uxc_audio_exit(lt9611uxc);
 999         drm_bridge_remove(&lt9611uxc->bridge);
1000
1001         mutex_destroy(&lt9611uxc->ocm_lock);
1002
1003         regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
1004
1005         of_node_put(lt9611uxc->dsi1_node);
1006         of_node_put(lt9611uxc->dsi0_node);
1007
1008         return 0;
1009 }
1010
1011 static struct i2c_device_id lt9611uxc_id[] = {
1012         { "lontium,lt9611uxc", 0 },
1013         { /* sentinel */ }
1014 };
1015
1016 static const struct of_device_id lt9611uxc_match_table[] = {
1017         { .compatible = "lontium,lt9611uxc" },
1018         { /* sentinel */ }
1019 };
1020 MODULE_DEVICE_TABLE(of, lt9611uxc_match_table);
1021
1022 static struct i2c_driver lt9611uxc_driver = {
1023         .driver = {
1024                 .name = "lt9611uxc",
1025                 .of_match_table = lt9611uxc_match_table,
1026                 .dev_groups = lt9611uxc_attr_groups,
1027         },
1028         .probe = lt9611uxc_probe,
1029         .remove = lt9611uxc_remove,
1030         .id_table = lt9611uxc_id,
1031 };
1032 module_i2c_driver(lt9611uxc_driver);
1033
1034 MODULE_AUTHOR("Dmitry Baryshkov <dmitry.baryshkov@linaro.org>");
1035 MODULE_LICENSE("GPL v2");