drivers/gpu/drm/bridge/lontium-lt8912b.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/delay.h>
   8 #include <linux/gpio/consumer.h>
   9 #include <linux/i2c.h>
  10 #include <linux/regmap.h>
  11
  12 #include <drm/drm_probe_helper.h>
  13 #include <drm/drm_atomic_helper.h>
  14 #include <drm/drm_edid.h>
  15 #include <drm/drm_mipi_dsi.h>
  16 #include <drm/drm_of.h>
  17
  18 #include <video/videomode.h>
  19
  20 #define I2C_MAIN 0
  21 #define I2C_ADDR_MAIN 0x48
  22
  23 #define I2C_CEC_DSI 1
  24 #define I2C_ADDR_CEC_DSI 0x49
  25
  26 #define I2C_MAX_IDX 2
  27
  28 struct lt8912 {
  29         struct device *dev;
  30         struct drm_bridge bridge;
  31         struct drm_connector connector;
  32
  33         struct i2c_client *i2c_client[I2C_MAX_IDX];
  34         struct regmap *regmap[I2C_MAX_IDX];
  35
  36         struct device_node *host_node;
  37         struct drm_bridge *hdmi_port;
  38
  39         struct mipi_dsi_device *dsi;
  40
  41         struct gpio_desc *gp_reset;
  42
  43         struct videomode mode;
  44
  45         u8 data_lanes;
  46         bool is_power_on;
  47         bool is_attached;
  48 };
  49
  50 static int lt8912_write_init_config(struct lt8912 *lt)
  51 {
  52         const struct reg_sequence seq[] = {
  53                 /* Digital clock en*/
  54                 {0x08, 0xff},
  55                 {0x09, 0xff},
  56                 {0x0a, 0xff},
  57                 {0x0b, 0x7c},
  58                 {0x0c, 0xff},
  59                 {0x42, 0x04},
  60
  61                 /*Tx Analog*/
  62                 {0x31, 0xb1},
  63                 {0x32, 0xb1},
  64                 {0x33, 0x0e},
  65                 {0x37, 0x00},
  66                 {0x38, 0x22},
  67                 {0x60, 0x82},
  68
  69                 /*Cbus Analog*/
  70                 {0x39, 0x45},
  71                 {0x3a, 0x00},
  72                 {0x3b, 0x00},
  73
  74                 /*HDMI Pll Analog*/
  75                 {0x44, 0x31},
  76                 {0x55, 0x44},
  77                 {0x57, 0x01},
  78                 {0x5a, 0x02},
  79
  80                 /*MIPI Analog*/
  81                 {0x3e, 0xd6},
  82                 {0x3f, 0xd4},
  83                 {0x41, 0x3c},
  84                 {0xB2, 0x00},
  85         };
  86
  87         return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq));
  88 }
  89
  90 static int lt8912_write_mipi_basic_config(struct lt8912 *lt)
  91 {
  92         const struct reg_sequence seq[] = {
  93                 {0x12, 0x04},
  94                 {0x14, 0x00},
  95                 {0x15, 0x00},
  96                 {0x1a, 0x03},
  97                 {0x1b, 0x03},
  98         };
  99
 100         return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
 101 };
 102
 103 static int lt8912_write_dds_config(struct lt8912 *lt)
 104 {
 105         const struct reg_sequence seq[] = {
 106                 {0x4e, 0xff},
 107                 {0x4f, 0x56},
 108                 {0x50, 0x69},
 109                 {0x51, 0x80},
 110                 {0x1f, 0x5e},
 111                 {0x20, 0x01},
 112                 {0x21, 0x2c},
 113                 {0x22, 0x01},
 114                 {0x23, 0xfa},
 115                 {0x24, 0x00},
 116                 {0x25, 0xc8},
 117                 {0x26, 0x00},
 118                 {0x27, 0x5e},
 119                 {0x28, 0x01},
 120                 {0x29, 0x2c},
 121                 {0x2a, 0x01},
 122                 {0x2b, 0xfa},
 123                 {0x2c, 0x00},
 124                 {0x2d, 0xc8},
 125                 {0x2e, 0x00},
 126                 {0x42, 0x64},
 127                 {0x43, 0x00},
 128                 {0x44, 0x04},
 129                 {0x45, 0x00},
 130                 {0x46, 0x59},
 131                 {0x47, 0x00},
 132                 {0x48, 0xf2},
 133                 {0x49, 0x06},
 134                 {0x4a, 0x00},
 135                 {0x4b, 0x72},
 136                 {0x4c, 0x45},
 137                 {0x4d, 0x00},
 138                 {0x52, 0x08},
 139                 {0x53, 0x00},
 140                 {0x54, 0xb2},
 141                 {0x55, 0x00},
 142                 {0x56, 0xe4},
 143                 {0x57, 0x0d},
 144                 {0x58, 0x00},
 145                 {0x59, 0xe4},
 146                 {0x5a, 0x8a},
 147                 {0x5b, 0x00},
 148                 {0x5c, 0x34},
 149                 {0x1e, 0x4f},
 150                 {0x51, 0x00},
 151         };
 152
 153         return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
 154 }
 155
 156 static int lt8912_write_rxlogicres_config(struct lt8912 *lt)
 157 {
 158         int ret;
 159
 160         ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f);
 161         usleep_range(10000, 20000);
 162         ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff);
 163
 164         return ret;
 165 };
 166
 167 static int lt8912_write_lvds_config(struct lt8912 *lt)
 168 {
 169         const struct reg_sequence seq[] = {
 170                 {0x44, 0x30},
 171                 {0x51, 0x05},
 172                 {0x50, 0x24},
 173                 {0x51, 0x2d},
 174                 {0x52, 0x04},
 175                 {0x69, 0x0e},
 176                 {0x69, 0x8e},
 177                 {0x6a, 0x00},
 178                 {0x6c, 0xb8},
 179                 {0x6b, 0x51},
 180                 {0x04, 0xfb},
 181                 {0x04, 0xff},
 182                 {0x7f, 0x00},
 183                 {0xa8, 0x13},
 184                 {0x02, 0xf7},
 185                 {0x02, 0xff},
 186                 {0x03, 0xcf},
 187                 {0x03, 0xff},
 188         };
 189
 190         return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
 191 };
 192
 193 static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)
 194 {
 195         return container_of(b, struct lt8912, bridge);
 196 }
 197
 198 static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c)
 199 {
 200         return container_of(c, struct lt8912, connector);
 201 }
 202
 203 static const struct regmap_config lt8912_regmap_config = {
 204         .reg_bits = 8,
 205         .val_bits = 8,
 206         .max_register = 0xff,
 207 };
 208
 209 static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client)
 210 {
 211         unsigned int i;
 212         /*
 213          * At this time we only initialize 2 chips, but the lt8912 provides
 214          * a third interface for the audio over HDMI configuration.
 215          */
 216         struct i2c_board_info info[] = {
 217                 { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), },
 218                 { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), },
 219         };
 220
 221         if (!lt)
 222                 return -ENODEV;
 223
 224         for (i = 0; i < ARRAY_SIZE(info); i++) {
 225                 if (i > 0) {
 226                         lt->i2c_client[i] = i2c_new_dummy_device(client->adapter,
 227                                                                  info[i].addr);
 228                         if (IS_ERR(lt->i2c_client[i]))
 229                                 return PTR_ERR(lt->i2c_client[i]);
 230                 }
 231
 232                 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i],
 233                                                      &lt8912_regmap_config);
 234                 if (IS_ERR(lt->regmap[i]))
 235                         return PTR_ERR(lt->regmap[i]);
 236         }
 237         return 0;
 238 }
 239
 240 static int lt8912_free_i2c(struct lt8912 *lt)
 241 {
 242         unsigned int i;
 243
 244         for (i = 1; i < I2C_MAX_IDX; i++)
 245                 i2c_unregister_device(lt->i2c_client[i]);
 246
 247         return 0;
 248 }
 249
 250 static int lt8912_hard_power_on(struct lt8912 *lt)
 251 {
 252         gpiod_set_value_cansleep(lt->gp_reset, 0);
 253         msleep(20);
 254
 255         return 0;
 256 }
 257
 258 static void lt8912_hard_power_off(struct lt8912 *lt)
 259 {
 260         gpiod_set_value_cansleep(lt->gp_reset, 1);
 261         msleep(20);
 262         lt->is_power_on = false;
 263 }
 264
 265 static int lt8912_video_setup(struct lt8912 *lt)
 266 {
 267         u32 hactive, h_total, hpw, hfp, hbp;
 268         u32 vactive, v_total, vpw, vfp, vbp;
 269         u8 settle = 0x08;
 270         int ret;
 271
 272         if (!lt)
 273                 return -EINVAL;
 274
 275         hactive = lt->mode.hactive;
 276         hfp = lt->mode.hfront_porch;
 277         hpw = lt->mode.hsync_len;
 278         hbp = lt->mode.hback_porch;
 279         h_total = hactive + hfp + hpw + hbp;
 280
 281         vactive = lt->mode.vactive;
 282         vfp = lt->mode.vfront_porch;
 283         vpw = lt->mode.vsync_len;
 284         vbp = lt->mode.vback_porch;
 285         v_total = vactive + vfp + vpw + vbp;
 286
 287         if (vactive <= 600)
 288                 settle = 0x04;
 289         else if (vactive == 1080)
 290                 settle = 0x0a;
 291
 292         ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01);
 293         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle);
 294         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw);
 295         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw);
 296         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff);
 297         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8);
 298
 299         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c);
 300
 301         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff);
 302         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8);
 303
 304         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff);
 305         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8);
 306
 307         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff);
 308         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8);
 309
 310         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff);
 311         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8);
 312
 313         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff);
 314         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8);
 315
 316         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff);
 317         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8);
 318
 319         return ret;
 320 }
 321
 322 static int lt8912_soft_power_on(struct lt8912 *lt)
 323 {
 324         if (!lt->is_power_on) {
 325                 u32 lanes = lt->data_lanes;
 326
 327                 lt8912_write_init_config(lt);
 328                 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3);
 329
 330                 lt8912_write_mipi_basic_config(lt);
 331
 332                 lt->is_power_on = true;
 333         }
 334
 335         return 0;
 336 }
 337
 338 static int lt8912_video_on(struct lt8912 *lt)
 339 {
 340         int ret;
 341
 342         ret = lt8912_video_setup(lt);
 343         if (ret < 0)
 344                 goto end;
 345
 346         ret = lt8912_write_dds_config(lt);
 347         if (ret < 0)
 348                 goto end;
 349
 350         ret = lt8912_write_rxlogicres_config(lt);
 351         if (ret < 0)
 352                 goto end;
 353
 354         ret = lt8912_write_lvds_config(lt);
 355         if (ret < 0)
 356                 goto end;
 357
 358 end:
 359         return ret;
 360 }
 361
 362 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt)
 363 {
 364         int ret;
 365         unsigned int reg_val;
 366
 367         ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, &reg_val);
 368         if (ret)
 369                 return connector_status_unknown;
 370
 371         if (reg_val & BIT(7))
 372                 return connector_status_connected;
 373
 374         return connector_status_disconnected;
 375 }
 376
 377 static enum drm_connector_status
 378 lt8912_connector_detect(struct drm_connector *connector, bool force)
 379 {
 380         struct lt8912 *lt = connector_to_lt8912(connector);
 381
 382         if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
 383                 return drm_bridge_detect(lt->hdmi_port);
 384
 385         return lt8912_check_cable_status(lt);
 386 }
 387
 388 static const struct drm_connector_funcs lt8912_connector_funcs = {
 389         .detect = lt8912_connector_detect,
 390         .fill_modes = drm_helper_probe_single_connector_modes,
 391         .destroy = drm_connector_cleanup,
 392         .reset = drm_atomic_helper_connector_reset,
 393         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 394         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 395 };
 396
 397 static enum drm_mode_status
 398 lt8912_connector_mode_valid(struct drm_connector *connector,
 399                             struct drm_display_mode *mode)
 400 {
 401         if (mode->clock > 150000)
 402                 return MODE_CLOCK_HIGH;
 403
 404         if (mode->hdisplay > 1920)
 405                 return MODE_BAD_HVALUE;
 406
 407         if (mode->vdisplay > 1080)
 408                 return MODE_BAD_VVALUE;
 409
 410         return MODE_OK;
 411 }
 412
 413 static int lt8912_connector_get_modes(struct drm_connector *connector)
 414 {
 415         struct edid *edid;
 416         int ret = -1;
 417         int num = 0;
 418         struct lt8912 *lt = connector_to_lt8912(connector);
 419         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 420
 421         edid = drm_bridge_get_edid(lt->hdmi_port, connector);
 422         if (edid) {
 423                 drm_connector_update_edid_property(connector, edid);
 424                 num = drm_add_edid_modes(connector, edid);
 425         } else {
 426                 return ret;
 427         }
 428
 429         ret = drm_display_info_set_bus_formats(&connector->display_info,
 430                                                &bus_format, 1);
 431         if (ret)
 432                 num = ret;
 433
 434         kfree(edid);
 435         return num;
 436 }
 437
 438 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {
 439         .get_modes = lt8912_connector_get_modes,
 440         .mode_valid = lt8912_connector_mode_valid,
 441 };
 442
 443 static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
 444                                    const struct drm_display_mode *mode,
 445                                    const struct drm_display_mode *adj)
 446 {
 447         struct lt8912 *lt = bridge_to_lt8912(bridge);
 448
 449         drm_display_mode_to_videomode(adj, &lt->mode);
 450 }
 451
 452 static void lt8912_bridge_enable(struct drm_bridge *bridge)
 453 {
 454         struct lt8912 *lt = bridge_to_lt8912(bridge);
 455
 456         lt8912_video_on(lt);
 457 }
 458
 459 static int lt8912_attach_dsi(struct lt8912 *lt)
 460 {
 461         struct device *dev = lt->dev;
 462         struct mipi_dsi_host *host;
 463         struct mipi_dsi_device *dsi;
 464         int ret = -1;
 465         const struct mipi_dsi_device_info info = { .type = "lt8912",
 466                                                    .channel = 0,
 467                                                    .node = NULL,
 468                                                  };
 469
 470         host = of_find_mipi_dsi_host_by_node(lt->host_node);
 471         if (!host) {
 472                 dev_err(dev, "failed to find dsi host\n");
 473                 return -EPROBE_DEFER;
 474         }
 475
 476         dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
 477         if (IS_ERR(dsi)) {
 478                 ret = PTR_ERR(dsi);
 479                 dev_err(dev, "failed to create dsi device (%d)\n", ret);
 480                 return ret;
 481         }
 482
 483         lt->dsi = dsi;
 484
 485         dsi->lanes = lt->data_lanes;
 486         dsi->format = MIPI_DSI_FMT_RGB888;
 487
 488         dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
 489                           MIPI_DSI_MODE_VIDEO_BURST |
 490                           MIPI_DSI_MODE_LPM |
 491                           MIPI_DSI_MODE_NO_EOT_PACKET;
 492
 493         ret = devm_mipi_dsi_attach(dev, dsi);
 494         if (ret < 0) {
 495                 dev_err(dev, "failed to attach dsi to host\n");
 496                 return ret;
 497         }
 498
 499         return 0;
 500 }
 501
 502 static int lt8912_bridge_connector_init(struct drm_bridge *bridge)
 503 {
 504         int ret;
 505         struct lt8912 *lt = bridge_to_lt8912(bridge);
 506         struct drm_connector *connector = &lt->connector;
 507
 508         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 509                             DRM_CONNECTOR_POLL_DISCONNECT;
 510
 511         ret = drm_connector_init(bridge->dev, connector,
 512                                  &lt8912_connector_funcs,
 513                                  lt->hdmi_port->type);
 514         if (ret)
 515                 goto exit;
 516
 517         drm_connector_helper_add(connector, &lt8912_connector_helper_funcs);
 518
 519         connector->dpms = DRM_MODE_DPMS_OFF;
 520         drm_connector_attach_encoder(connector, bridge->encoder);
 521
 522 exit:
 523         return ret;
 524 }
 525
 526 static int lt8912_bridge_attach(struct drm_bridge *bridge,
 527                                 enum drm_bridge_attach_flags flags)
 528 {
 529         struct lt8912 *lt = bridge_to_lt8912(bridge);
 530         int ret;
 531
 532         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
 533                 ret = lt8912_bridge_connector_init(bridge);
 534                 if (ret) {
 535                         dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret);
 536                         return ret;
 537                 }
 538         }
 539
 540         ret = lt8912_hard_power_on(lt);
 541         if (ret)
 542                 return ret;
 543
 544         ret = lt8912_soft_power_on(lt);
 545         if (ret)
 546                 goto error;
 547
 548         lt->is_attached = true;
 549
 550         return 0;
 551
 552 error:
 553         lt8912_hard_power_off(lt);
 554         return ret;
 555 }
 556
 557 static void lt8912_bridge_detach(struct drm_bridge *bridge)
 558 {
 559         struct lt8912 *lt = bridge_to_lt8912(bridge);
 560
 561         if (lt->is_attached) {
 562                 lt8912_hard_power_off(lt);
 563                 drm_connector_unregister(&lt->connector);
 564                 drm_connector_cleanup(&lt->connector);
 565         }
 566 }
 567
 568 static enum drm_connector_status
 569 lt8912_bridge_detect(struct drm_bridge *bridge)
 570 {
 571         struct lt8912 *lt = bridge_to_lt8912(bridge);
 572
 573         if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
 574                 return drm_bridge_detect(lt->hdmi_port);
 575
 576         return lt8912_check_cable_status(lt);
 577 }
 578
 579 static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge,
 580                                            struct drm_connector *connector)
 581 {
 582         struct lt8912 *lt = bridge_to_lt8912(bridge);
 583
 584         /*
 585          * edid must be read through the ddc bus but it must be
 586          * given to the hdmi connector node.
 587          */
 588         if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID)
 589                 return drm_bridge_get_edid(lt->hdmi_port, connector);
 590
 591         dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n");
 592         return NULL;
 593 }
 594
 595 static const struct drm_bridge_funcs lt8912_bridge_funcs = {
 596         .attach = lt8912_bridge_attach,
 597         .detach = lt8912_bridge_detach,
 598         .mode_set = lt8912_bridge_mode_set,
 599         .enable = lt8912_bridge_enable,
 600         .detect = lt8912_bridge_detect,
 601         .get_edid = lt8912_bridge_get_edid,
 602 };
 603
 604 static int lt8912_parse_dt(struct lt8912 *lt)
 605 {
 606         struct gpio_desc *gp_reset;
 607         struct device *dev = lt->dev;
 608         int ret;
 609         int data_lanes;
 610         struct device_node *port_node;
 611
 612         gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 613         if (IS_ERR(gp_reset)) {
 614                 ret = PTR_ERR(gp_reset);
 615                 if (ret != -EPROBE_DEFER)
 616                         dev_err(dev, "Failed to get reset gpio: %d\n", ret);
 617                 return ret;
 618         }
 619         lt->gp_reset = gp_reset;
 620
 621         data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4);
 622         if (data_lanes < 0) {
 623                 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__);
 624                 return data_lanes;
 625         }
 626
 627         lt->data_lanes = data_lanes;
 628
 629         lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1);
 630         if (!lt->host_node) {
 631                 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__);
 632                 return -ENODEV;
 633         }
 634
 635         port_node = of_graph_get_remote_node(dev->of_node, 1, -1);
 636         if (!port_node) {
 637                 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__);
 638                 ret = -ENODEV;
 639                 goto err_free_host_node;
 640         }
 641
 642         lt->hdmi_port = of_drm_find_bridge(port_node);
 643         if (!lt->hdmi_port) {
 644                 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
 645                 ret = -ENODEV;
 646                 goto err_free_host_node;
 647         }
 648
 649         if (!of_device_is_compatible(port_node, "hdmi-connector")) {
 650                 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
 651                 ret = -EINVAL;
 652                 goto err_free_host_node;
 653         }
 654
 655         of_node_put(port_node);
 656         return 0;
 657
 658 err_free_host_node:
 659         of_node_put(port_node);
 660         of_node_put(lt->host_node);
 661         return ret;
 662 }
 663
 664 static int lt8912_put_dt(struct lt8912 *lt)
 665 {
 666         of_node_put(lt->host_node);
 667         return 0;
 668 }
 669
 670 static int lt8912_probe(struct i2c_client *client,
 671                         const struct i2c_device_id *id)
 672 {
 673         static struct lt8912 *lt;
 674         int ret = 0;
 675         struct device *dev = &client->dev;
 676
 677         lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL);
 678         if (!lt)
 679                 return -ENOMEM;
 680
 681         lt->dev = dev;
 682         lt->i2c_client[0] = client;
 683
 684         ret = lt8912_parse_dt(lt);
 685         if (ret)
 686                 goto err_dt_parse;
 687
 688         ret = lt8912_init_i2c(lt, client);
 689         if (ret)
 690                 goto err_i2c;
 691
 692         i2c_set_clientdata(client, lt);
 693
 694         lt->bridge.funcs = &lt8912_bridge_funcs;
 695         lt->bridge.of_node = dev->of_node;
 696         lt->bridge.ops = (DRM_BRIDGE_OP_EDID |
 697                           DRM_BRIDGE_OP_DETECT);
 698
 699         drm_bridge_add(&lt->bridge);
 700
 701         ret = lt8912_attach_dsi(lt);
 702         if (ret)
 703                 goto err_attach;
 704
 705         return 0;
 706
 707 err_attach:
 708         drm_bridge_remove(&lt->bridge);
 709         lt8912_free_i2c(lt);
 710 err_i2c:
 711         lt8912_put_dt(lt);
 712 err_dt_parse:
 713         return ret;
 714 }
 715
 716 static int lt8912_remove(struct i2c_client *client)
 717 {
 718         struct lt8912 *lt = i2c_get_clientdata(client);
 719
 720         lt8912_bridge_detach(&lt->bridge);
 721         drm_bridge_remove(&lt->bridge);
 722         lt8912_free_i2c(lt);
 723         lt8912_put_dt(lt);
 724         return 0;
 725 }
 726
 727 static const struct of_device_id lt8912_dt_match[] = {
 728         {.compatible = "lontium,lt8912b"},
 729         {}
 730 };
 731 MODULE_DEVICE_TABLE(of, lt8912_dt_match);
 732
 733 static const struct i2c_device_id lt8912_id[] = {
 734         {"lt8912", 0},
 735         {},
 736 };
 737 MODULE_DEVICE_TABLE(i2c, lt8912_id);
 738
 739 static struct i2c_driver lt8912_i2c_driver = {
 740         .driver = {
 741                 .name = "lt8912",
 742                 .of_match_table = lt8912_dt_match,
 743         },
 744         .probe = lt8912_probe,
 745         .remove = lt8912_remove,
 746         .id_table = lt8912_id,
 747 };
 748 module_i2c_driver(lt8912_i2c_driver);
 749
 750 MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>");
 751 MODULE_DESCRIPTION("lt8912 drm driver");
 752 MODULE_LICENSE("GPL v2");