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