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