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/media-bus-format.h> 11 #include <linux/regmap.h> 12 13 #include <drm/drm_probe_helper.h> 14 #include <drm/drm_atomic_helper.h> 15 #include <drm/drm_edid.h> 16 #include <drm/drm_mipi_dsi.h> 17 #include <drm/drm_of.h> 18 19 #include <video/videomode.h> 20 21 #define I2C_MAIN 0 22 #define I2C_ADDR_MAIN 0x48 23 24 #define I2C_CEC_DSI 1 25 #define I2C_ADDR_CEC_DSI 0x49 26 27 #define I2C_MAX_IDX 2 28 29 struct lt8912 { 30 struct device *dev; 31 struct drm_bridge bridge; 32 struct drm_connector connector; 33 34 struct i2c_client *i2c_client[I2C_MAX_IDX]; 35 struct regmap *regmap[I2C_MAX_IDX]; 36 37 struct device_node *host_node; 38 struct drm_bridge *hdmi_port; 39 40 struct mipi_dsi_device *dsi; 41 42 struct gpio_desc *gp_reset; 43 44 struct videomode mode; 45 46 u8 data_lanes; 47 bool is_power_on; 48 bool is_attached; 49 }; 50 51 static int lt8912_write_init_config(struct lt8912 *lt) 52 { 53 const struct reg_sequence seq[] = { 54 /* Digital clock en*/ 55 {0x08, 0xff}, 56 {0x09, 0xff}, 57 {0x0a, 0xff}, 58 {0x0b, 0x7c}, 59 {0x0c, 0xff}, 60 {0x42, 0x04}, 61 62 /*Tx Analog*/ 63 {0x31, 0xb1}, 64 {0x32, 0xb1}, 65 {0x33, 0x0e}, 66 {0x37, 0x00}, 67 {0x38, 0x22}, 68 {0x60, 0x82}, 69 70 /*Cbus Analog*/ 71 {0x39, 0x45}, 72 {0x3a, 0x00}, 73 {0x3b, 0x00}, 74 75 /*HDMI Pll Analog*/ 76 {0x44, 0x31}, 77 {0x55, 0x44}, 78 {0x57, 0x01}, 79 {0x5a, 0x02}, 80 81 /*MIPI Analog*/ 82 {0x3e, 0xd6}, 83 {0x3f, 0xd4}, 84 {0x41, 0x3c}, 85 {0xB2, 0x00}, 86 }; 87 88 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); 89 } 90 91 static int lt8912_write_mipi_basic_config(struct lt8912 *lt) 92 { 93 const struct reg_sequence seq[] = { 94 {0x12, 0x04}, 95 {0x14, 0x00}, 96 {0x15, 0x00}, 97 {0x1a, 0x03}, 98 {0x1b, 0x03}, 99 }; 100 101 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); 102 }; 103 104 static int lt8912_write_dds_config(struct lt8912 *lt) 105 { 106 const struct reg_sequence seq[] = { 107 {0x4e, 0xff}, 108 {0x4f, 0x56}, 109 {0x50, 0x69}, 110 {0x51, 0x80}, 111 {0x1f, 0x5e}, 112 {0x20, 0x01}, 113 {0x21, 0x2c}, 114 {0x22, 0x01}, 115 {0x23, 0xfa}, 116 {0x24, 0x00}, 117 {0x25, 0xc8}, 118 {0x26, 0x00}, 119 {0x27, 0x5e}, 120 {0x28, 0x01}, 121 {0x29, 0x2c}, 122 {0x2a, 0x01}, 123 {0x2b, 0xfa}, 124 {0x2c, 0x00}, 125 {0x2d, 0xc8}, 126 {0x2e, 0x00}, 127 {0x42, 0x64}, 128 {0x43, 0x00}, 129 {0x44, 0x04}, 130 {0x45, 0x00}, 131 {0x46, 0x59}, 132 {0x47, 0x00}, 133 {0x48, 0xf2}, 134 {0x49, 0x06}, 135 {0x4a, 0x00}, 136 {0x4b, 0x72}, 137 {0x4c, 0x45}, 138 {0x4d, 0x00}, 139 {0x52, 0x08}, 140 {0x53, 0x00}, 141 {0x54, 0xb2}, 142 {0x55, 0x00}, 143 {0x56, 0xe4}, 144 {0x57, 0x0d}, 145 {0x58, 0x00}, 146 {0x59, 0xe4}, 147 {0x5a, 0x8a}, 148 {0x5b, 0x00}, 149 {0x5c, 0x34}, 150 {0x1e, 0x4f}, 151 {0x51, 0x00}, 152 }; 153 154 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); 155 } 156 157 static int lt8912_write_rxlogicres_config(struct lt8912 *lt) 158 { 159 int ret; 160 161 ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f); 162 usleep_range(10000, 20000); 163 ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff); 164 165 return ret; 166 }; 167 168 static int lt8912_write_lvds_config(struct lt8912 *lt) 169 { 170 const struct reg_sequence seq[] = { 171 {0x44, 0x30}, 172 {0x51, 0x05}, 173 {0x50, 0x24}, 174 {0x51, 0x2d}, 175 {0x52, 0x04}, 176 {0x69, 0x0e}, 177 {0x69, 0x8e}, 178 {0x6a, 0x00}, 179 {0x6c, 0xb8}, 180 {0x6b, 0x51}, 181 {0x04, 0xfb}, 182 {0x04, 0xff}, 183 {0x7f, 0x00}, 184 {0xa8, 0x13}, 185 {0x02, 0xf7}, 186 {0x02, 0xff}, 187 {0x03, 0xcf}, 188 {0x03, 0xff}, 189 }; 190 191 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); 192 }; 193 194 static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) 195 { 196 return container_of(b, struct lt8912, bridge); 197 } 198 199 static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c) 200 { 201 return container_of(c, struct lt8912, connector); 202 } 203 204 static const struct regmap_config lt8912_regmap_config = { 205 .reg_bits = 8, 206 .val_bits = 8, 207 .max_register = 0xff, 208 }; 209 210 static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client) 211 { 212 unsigned int i; 213 /* 214 * At this time we only initialize 2 chips, but the lt8912 provides 215 * a third interface for the audio over HDMI configuration. 216 */ 217 struct i2c_board_info info[] = { 218 { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), }, 219 { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), }, 220 }; 221 222 if (!lt) 223 return -ENODEV; 224 225 for (i = 0; i < ARRAY_SIZE(info); i++) { 226 if (i > 0) { 227 lt->i2c_client[i] = i2c_new_dummy_device(client->adapter, 228 info[i].addr); 229 if (IS_ERR(lt->i2c_client[i])) 230 return PTR_ERR(lt->i2c_client[i]); 231 } 232 233 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i], 234 <8912_regmap_config); 235 if (IS_ERR(lt->regmap[i])) 236 return PTR_ERR(lt->regmap[i]); 237 } 238 return 0; 239 } 240 241 static int lt8912_free_i2c(struct lt8912 *lt) 242 { 243 unsigned int i; 244 245 for (i = 1; i < I2C_MAX_IDX; i++) 246 i2c_unregister_device(lt->i2c_client[i]); 247 248 return 0; 249 } 250 251 static int lt8912_hard_power_on(struct lt8912 *lt) 252 { 253 gpiod_set_value_cansleep(lt->gp_reset, 0); 254 msleep(20); 255 256 return 0; 257 } 258 259 static void lt8912_hard_power_off(struct lt8912 *lt) 260 { 261 gpiod_set_value_cansleep(lt->gp_reset, 1); 262 msleep(20); 263 lt->is_power_on = false; 264 } 265 266 static int lt8912_video_setup(struct lt8912 *lt) 267 { 268 u32 hactive, h_total, hpw, hfp, hbp; 269 u32 vactive, v_total, vpw, vfp, vbp; 270 u8 settle = 0x08; 271 int ret, hsync_activehigh, vsync_activehigh; 272 273 if (!lt) 274 return -EINVAL; 275 276 hactive = lt->mode.hactive; 277 hfp = lt->mode.hfront_porch; 278 hpw = lt->mode.hsync_len; 279 hbp = lt->mode.hback_porch; 280 h_total = hactive + hfp + hpw + hbp; 281 hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH; 282 283 vactive = lt->mode.vactive; 284 vfp = lt->mode.vfront_porch; 285 vpw = lt->mode.vsync_len; 286 vbp = lt->mode.vback_porch; 287 v_total = vactive + vfp + vpw + vbp; 288 vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH; 289 290 if (vactive <= 600) 291 settle = 0x04; 292 else if (vactive == 1080) 293 settle = 0x0a; 294 295 ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01); 296 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle); 297 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw); 298 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw); 299 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff); 300 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8); 301 302 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c); 303 304 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff); 305 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8); 306 307 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff); 308 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8); 309 310 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff); 311 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8); 312 313 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff); 314 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8); 315 316 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff); 317 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8); 318 319 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff); 320 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8); 321 322 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0), 323 vsync_activehigh ? BIT(0) : 0); 324 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1), 325 hsync_activehigh ? BIT(1) : 0); 326 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0), 327 lt->connector.display_info.is_hdmi ? BIT(0) : 0); 328 329 return ret; 330 } 331 332 static int lt8912_soft_power_on(struct lt8912 *lt) 333 { 334 if (!lt->is_power_on) { 335 u32 lanes = lt->data_lanes; 336 337 lt8912_write_init_config(lt); 338 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3); 339 340 lt8912_write_mipi_basic_config(lt); 341 342 lt->is_power_on = true; 343 } 344 345 return 0; 346 } 347 348 static int lt8912_video_on(struct lt8912 *lt) 349 { 350 int ret; 351 352 ret = lt8912_video_setup(lt); 353 if (ret < 0) 354 goto end; 355 356 ret = lt8912_write_dds_config(lt); 357 if (ret < 0) 358 goto end; 359 360 ret = lt8912_write_rxlogicres_config(lt); 361 if (ret < 0) 362 goto end; 363 364 ret = lt8912_write_lvds_config(lt); 365 if (ret < 0) 366 goto end; 367 368 end: 369 return ret; 370 } 371 372 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt) 373 { 374 int ret; 375 unsigned int reg_val; 376 377 ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val); 378 if (ret) 379 return connector_status_unknown; 380 381 if (reg_val & BIT(7)) 382 return connector_status_connected; 383 384 return connector_status_disconnected; 385 } 386 387 static enum drm_connector_status 388 lt8912_connector_detect(struct drm_connector *connector, bool force) 389 { 390 struct lt8912 *lt = connector_to_lt8912(connector); 391 392 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 393 return drm_bridge_detect(lt->hdmi_port); 394 395 return lt8912_check_cable_status(lt); 396 } 397 398 static const struct drm_connector_funcs lt8912_connector_funcs = { 399 .detect = lt8912_connector_detect, 400 .fill_modes = drm_helper_probe_single_connector_modes, 401 .destroy = drm_connector_cleanup, 402 .reset = drm_atomic_helper_connector_reset, 403 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 404 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 405 }; 406 407 static enum drm_mode_status 408 lt8912_connector_mode_valid(struct drm_connector *connector, 409 struct drm_display_mode *mode) 410 { 411 if (mode->clock > 150000) 412 return MODE_CLOCK_HIGH; 413 414 if (mode->hdisplay > 1920) 415 return MODE_BAD_HVALUE; 416 417 if (mode->vdisplay > 1080) 418 return MODE_BAD_VVALUE; 419 420 return MODE_OK; 421 } 422 423 static int lt8912_connector_get_modes(struct drm_connector *connector) 424 { 425 struct edid *edid; 426 int ret = -1; 427 int num = 0; 428 struct lt8912 *lt = connector_to_lt8912(connector); 429 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 430 431 edid = drm_bridge_get_edid(lt->hdmi_port, connector); 432 if (edid) { 433 drm_connector_update_edid_property(connector, edid); 434 num = drm_add_edid_modes(connector, edid); 435 } else { 436 return ret; 437 } 438 439 ret = drm_display_info_set_bus_formats(&connector->display_info, 440 &bus_format, 1); 441 if (ret) 442 num = ret; 443 444 kfree(edid); 445 return num; 446 } 447 448 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { 449 .get_modes = lt8912_connector_get_modes, 450 .mode_valid = lt8912_connector_mode_valid, 451 }; 452 453 static void lt8912_bridge_mode_set(struct drm_bridge *bridge, 454 const struct drm_display_mode *mode, 455 const struct drm_display_mode *adj) 456 { 457 struct lt8912 *lt = bridge_to_lt8912(bridge); 458 459 drm_display_mode_to_videomode(adj, <->mode); 460 } 461 462 static void lt8912_bridge_enable(struct drm_bridge *bridge) 463 { 464 struct lt8912 *lt = bridge_to_lt8912(bridge); 465 466 lt8912_video_on(lt); 467 } 468 469 static int lt8912_attach_dsi(struct lt8912 *lt) 470 { 471 struct device *dev = lt->dev; 472 struct mipi_dsi_host *host; 473 struct mipi_dsi_device *dsi; 474 int ret = -1; 475 const struct mipi_dsi_device_info info = { .type = "lt8912", 476 .channel = 0, 477 .node = NULL, 478 }; 479 480 host = of_find_mipi_dsi_host_by_node(lt->host_node); 481 if (!host) { 482 dev_err(dev, "failed to find dsi host\n"); 483 return -EPROBE_DEFER; 484 } 485 486 dsi = devm_mipi_dsi_device_register_full(dev, host, &info); 487 if (IS_ERR(dsi)) { 488 ret = PTR_ERR(dsi); 489 dev_err(dev, "failed to create dsi device (%d)\n", ret); 490 return ret; 491 } 492 493 lt->dsi = dsi; 494 495 dsi->lanes = lt->data_lanes; 496 dsi->format = MIPI_DSI_FMT_RGB888; 497 498 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | 499 MIPI_DSI_MODE_VIDEO_BURST | 500 MIPI_DSI_MODE_LPM | 501 MIPI_DSI_MODE_NO_EOT_PACKET; 502 503 ret = devm_mipi_dsi_attach(dev, dsi); 504 if (ret < 0) { 505 dev_err(dev, "failed to attach dsi to host\n"); 506 return ret; 507 } 508 509 return 0; 510 } 511 512 static int lt8912_bridge_connector_init(struct drm_bridge *bridge) 513 { 514 int ret; 515 struct lt8912 *lt = bridge_to_lt8912(bridge); 516 struct drm_connector *connector = <->connector; 517 518 connector->polled = DRM_CONNECTOR_POLL_CONNECT | 519 DRM_CONNECTOR_POLL_DISCONNECT; 520 521 ret = drm_connector_init(bridge->dev, connector, 522 <8912_connector_funcs, 523 lt->hdmi_port->type); 524 if (ret) 525 goto exit; 526 527 drm_connector_helper_add(connector, <8912_connector_helper_funcs); 528 529 connector->dpms = DRM_MODE_DPMS_OFF; 530 drm_connector_attach_encoder(connector, bridge->encoder); 531 532 exit: 533 return ret; 534 } 535 536 static int lt8912_bridge_attach(struct drm_bridge *bridge, 537 enum drm_bridge_attach_flags flags) 538 { 539 struct lt8912 *lt = bridge_to_lt8912(bridge); 540 int ret; 541 542 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 543 ret = lt8912_bridge_connector_init(bridge); 544 if (ret) { 545 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret); 546 return ret; 547 } 548 } 549 550 ret = lt8912_hard_power_on(lt); 551 if (ret) 552 return ret; 553 554 ret = lt8912_soft_power_on(lt); 555 if (ret) 556 goto error; 557 558 lt->is_attached = true; 559 560 return 0; 561 562 error: 563 lt8912_hard_power_off(lt); 564 return ret; 565 } 566 567 static void lt8912_bridge_detach(struct drm_bridge *bridge) 568 { 569 struct lt8912 *lt = bridge_to_lt8912(bridge); 570 571 if (lt->is_attached) { 572 lt8912_hard_power_off(lt); 573 drm_connector_unregister(<->connector); 574 drm_connector_cleanup(<->connector); 575 } 576 } 577 578 static enum drm_connector_status 579 lt8912_bridge_detect(struct drm_bridge *bridge) 580 { 581 struct lt8912 *lt = bridge_to_lt8912(bridge); 582 583 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 584 return drm_bridge_detect(lt->hdmi_port); 585 586 return lt8912_check_cable_status(lt); 587 } 588 589 static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge, 590 struct drm_connector *connector) 591 { 592 struct lt8912 *lt = bridge_to_lt8912(bridge); 593 594 /* 595 * edid must be read through the ddc bus but it must be 596 * given to the hdmi connector node. 597 */ 598 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) 599 return drm_bridge_get_edid(lt->hdmi_port, connector); 600 601 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n"); 602 return NULL; 603 } 604 605 static const struct drm_bridge_funcs lt8912_bridge_funcs = { 606 .attach = lt8912_bridge_attach, 607 .detach = lt8912_bridge_detach, 608 .mode_set = lt8912_bridge_mode_set, 609 .enable = lt8912_bridge_enable, 610 .detect = lt8912_bridge_detect, 611 .get_edid = lt8912_bridge_get_edid, 612 }; 613 614 static int lt8912_parse_dt(struct lt8912 *lt) 615 { 616 struct gpio_desc *gp_reset; 617 struct device *dev = lt->dev; 618 int ret; 619 int data_lanes; 620 struct device_node *port_node; 621 622 gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); 623 if (IS_ERR(gp_reset)) { 624 ret = PTR_ERR(gp_reset); 625 if (ret != -EPROBE_DEFER) 626 dev_err(dev, "Failed to get reset gpio: %d\n", ret); 627 return ret; 628 } 629 lt->gp_reset = gp_reset; 630 631 data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4); 632 if (data_lanes < 0) { 633 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__); 634 return data_lanes; 635 } 636 637 lt->data_lanes = data_lanes; 638 639 lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1); 640 if (!lt->host_node) { 641 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__); 642 return -ENODEV; 643 } 644 645 port_node = of_graph_get_remote_node(dev->of_node, 1, -1); 646 if (!port_node) { 647 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__); 648 ret = -ENODEV; 649 goto err_free_host_node; 650 } 651 652 lt->hdmi_port = of_drm_find_bridge(port_node); 653 if (!lt->hdmi_port) { 654 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); 655 ret = -ENODEV; 656 goto err_free_host_node; 657 } 658 659 if (!of_device_is_compatible(port_node, "hdmi-connector")) { 660 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); 661 ret = -EINVAL; 662 goto err_free_host_node; 663 } 664 665 of_node_put(port_node); 666 return 0; 667 668 err_free_host_node: 669 of_node_put(port_node); 670 of_node_put(lt->host_node); 671 return ret; 672 } 673 674 static int lt8912_put_dt(struct lt8912 *lt) 675 { 676 of_node_put(lt->host_node); 677 return 0; 678 } 679 680 static int lt8912_probe(struct i2c_client *client, 681 const struct i2c_device_id *id) 682 { 683 static struct lt8912 *lt; 684 int ret = 0; 685 struct device *dev = &client->dev; 686 687 lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL); 688 if (!lt) 689 return -ENOMEM; 690 691 lt->dev = dev; 692 lt->i2c_client[0] = client; 693 694 ret = lt8912_parse_dt(lt); 695 if (ret) 696 goto err_dt_parse; 697 698 ret = lt8912_init_i2c(lt, client); 699 if (ret) 700 goto err_i2c; 701 702 i2c_set_clientdata(client, lt); 703 704 lt->bridge.funcs = <8912_bridge_funcs; 705 lt->bridge.of_node = dev->of_node; 706 lt->bridge.ops = (DRM_BRIDGE_OP_EDID | 707 DRM_BRIDGE_OP_DETECT); 708 709 drm_bridge_add(<->bridge); 710 711 ret = lt8912_attach_dsi(lt); 712 if (ret) 713 goto err_attach; 714 715 return 0; 716 717 err_attach: 718 drm_bridge_remove(<->bridge); 719 lt8912_free_i2c(lt); 720 err_i2c: 721 lt8912_put_dt(lt); 722 err_dt_parse: 723 return ret; 724 } 725 726 static int lt8912_remove(struct i2c_client *client) 727 { 728 struct lt8912 *lt = i2c_get_clientdata(client); 729 730 lt8912_bridge_detach(<->bridge); 731 drm_bridge_remove(<->bridge); 732 lt8912_free_i2c(lt); 733 lt8912_put_dt(lt); 734 return 0; 735 } 736 737 static const struct of_device_id lt8912_dt_match[] = { 738 {.compatible = "lontium,lt8912b"}, 739 {} 740 }; 741 MODULE_DEVICE_TABLE(of, lt8912_dt_match); 742 743 static const struct i2c_device_id lt8912_id[] = { 744 {"lt8912", 0}, 745 {}, 746 }; 747 MODULE_DEVICE_TABLE(i2c, lt8912_id); 748 749 static struct i2c_driver lt8912_i2c_driver = { 750 .driver = { 751 .name = "lt8912", 752 .of_match_table = lt8912_dt_match, 753 }, 754 .probe = lt8912_probe, 755 .remove = lt8912_remove, 756 .id_table = lt8912_id, 757 }; 758 module_i2c_driver(lt8912_i2c_driver); 759 760 MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>"); 761 MODULE_DESCRIPTION("lt8912 drm driver"); 762 MODULE_LICENSE("GPL v2"); 763