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