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/gpio.h> 11 #include <linux/of_gpio.h> 12 #include <linux/regmap.h> 13 14 #include <drm/drm_probe_helper.h> 15 #include <drm/drm_atomic_helper.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_CEC_DSI], 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; 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; 281 282 vactive = lt->mode.vactive; 283 vfp = lt->mode.vfront_porch; 284 vpw = lt->mode.vsync_len; 285 vbp = lt->mode.vback_porch; 286 v_total = vactive + vfp + vpw + vbp; 287 288 if (vactive <= 600) 289 settle = 0x04; 290 else if (vactive == 1080) 291 settle = 0x0a; 292 293 ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01); 294 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle); 295 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw); 296 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw); 297 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff); 298 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8); 299 300 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c); 301 302 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff); 303 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8); 304 305 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff); 306 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8); 307 308 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff); 309 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8); 310 311 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff); 312 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8); 313 314 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff); 315 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8); 316 317 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff); 318 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8); 319 320 return ret; 321 } 322 323 static int lt8912_soft_power_on(struct lt8912 *lt) 324 { 325 if (!lt->is_power_on) { 326 u32 lanes = lt->data_lanes; 327 328 lt8912_write_init_config(lt); 329 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3); 330 331 lt8912_write_mipi_basic_config(lt); 332 333 lt->is_power_on = true; 334 } 335 336 return 0; 337 } 338 339 static int lt8912_video_on(struct lt8912 *lt) 340 { 341 int ret; 342 343 ret = lt8912_video_setup(lt); 344 if (ret < 0) 345 goto end; 346 347 ret = lt8912_write_dds_config(lt); 348 if (ret < 0) 349 goto end; 350 351 ret = lt8912_write_rxlogicres_config(lt); 352 if (ret < 0) 353 goto end; 354 355 ret = lt8912_write_lvds_config(lt); 356 if (ret < 0) 357 goto end; 358 359 end: 360 return ret; 361 } 362 363 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt) 364 { 365 int ret; 366 unsigned int reg_val; 367 368 ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val); 369 if (ret) 370 return connector_status_unknown; 371 372 if (reg_val & BIT(7)) 373 return connector_status_connected; 374 375 return connector_status_disconnected; 376 } 377 378 static enum drm_connector_status 379 lt8912_connector_detect(struct drm_connector *connector, bool force) 380 { 381 struct lt8912 *lt = connector_to_lt8912(connector); 382 383 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 384 return drm_bridge_detect(lt->hdmi_port); 385 386 return lt8912_check_cable_status(lt); 387 } 388 389 static const struct drm_connector_funcs lt8912_connector_funcs = { 390 .detect = lt8912_connector_detect, 391 .fill_modes = drm_helper_probe_single_connector_modes, 392 .destroy = drm_connector_cleanup, 393 .reset = drm_atomic_helper_connector_reset, 394 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 395 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 396 }; 397 398 static enum drm_mode_status 399 lt8912_connector_mode_valid(struct drm_connector *connector, 400 struct drm_display_mode *mode) 401 { 402 if (mode->clock > 150000) 403 return MODE_CLOCK_HIGH; 404 405 if (mode->hdisplay > 1920) 406 return MODE_BAD_HVALUE; 407 408 if (mode->vdisplay > 1080) 409 return MODE_BAD_VVALUE; 410 411 return MODE_OK; 412 } 413 414 static int lt8912_connector_get_modes(struct drm_connector *connector) 415 { 416 struct edid *edid; 417 int ret = -1; 418 int num = 0; 419 struct lt8912 *lt = connector_to_lt8912(connector); 420 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 421 422 edid = drm_bridge_get_edid(lt->hdmi_port, connector); 423 if (edid) { 424 drm_connector_update_edid_property(connector, edid); 425 num = drm_add_edid_modes(connector, edid); 426 } else { 427 return ret; 428 } 429 430 ret = drm_display_info_set_bus_formats(&connector->display_info, 431 &bus_format, 1); 432 if (ret) 433 num = ret; 434 435 kfree(edid); 436 return num; 437 } 438 439 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { 440 .get_modes = lt8912_connector_get_modes, 441 .mode_valid = lt8912_connector_mode_valid, 442 }; 443 444 static void lt8912_bridge_mode_set(struct drm_bridge *bridge, 445 const struct drm_display_mode *mode, 446 const struct drm_display_mode *adj) 447 { 448 struct lt8912 *lt = bridge_to_lt8912(bridge); 449 450 drm_display_mode_to_videomode(adj, <->mode); 451 } 452 453 static void lt8912_bridge_enable(struct drm_bridge *bridge) 454 { 455 struct lt8912 *lt = bridge_to_lt8912(bridge); 456 457 lt8912_video_on(lt); 458 } 459 460 static int lt8912_attach_dsi(struct lt8912 *lt) 461 { 462 struct device *dev = lt->dev; 463 struct mipi_dsi_host *host; 464 struct mipi_dsi_device *dsi; 465 int ret = -1; 466 const struct mipi_dsi_device_info info = { .type = "lt8912", 467 .channel = 0, 468 .node = NULL, 469 }; 470 471 host = of_find_mipi_dsi_host_by_node(lt->host_node); 472 if (!host) { 473 dev_err(dev, "failed to find dsi host\n"); 474 return -EPROBE_DEFER; 475 } 476 477 dsi = mipi_dsi_device_register_full(host, &info); 478 if (IS_ERR(dsi)) { 479 ret = PTR_ERR(dsi); 480 dev_err(dev, "failed to create dsi device (%d)\n", ret); 481 goto err_dsi_device; 482 } 483 484 lt->dsi = dsi; 485 486 dsi->lanes = lt->data_lanes; 487 dsi->format = MIPI_DSI_FMT_RGB888; 488 489 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | 490 MIPI_DSI_MODE_VIDEO_BURST | 491 MIPI_DSI_MODE_LPM | 492 MIPI_DSI_MODE_EOT_PACKET; 493 494 ret = mipi_dsi_attach(dsi); 495 if (ret < 0) { 496 dev_err(dev, "failed to attach dsi to host\n"); 497 goto err_dsi_attach; 498 } 499 500 return 0; 501 502 err_dsi_attach: 503 mipi_dsi_device_unregister(dsi); 504 err_dsi_device: 505 return ret; 506 } 507 508 static void lt8912_detach_dsi(struct lt8912 *lt) 509 { 510 mipi_dsi_detach(lt->dsi); 511 mipi_dsi_device_unregister(lt->dsi); 512 } 513 514 static int lt8912_bridge_connector_init(struct drm_bridge *bridge) 515 { 516 int ret; 517 struct lt8912 *lt = bridge_to_lt8912(bridge); 518 struct drm_connector *connector = <->connector; 519 520 connector->polled = DRM_CONNECTOR_POLL_CONNECT | 521 DRM_CONNECTOR_POLL_DISCONNECT; 522 523 ret = drm_connector_init(bridge->dev, connector, 524 <8912_connector_funcs, 525 lt->hdmi_port->type); 526 if (ret) 527 goto exit; 528 529 drm_connector_helper_add(connector, <8912_connector_helper_funcs); 530 531 connector->dpms = DRM_MODE_DPMS_OFF; 532 drm_connector_attach_encoder(connector, bridge->encoder); 533 534 exit: 535 return ret; 536 } 537 538 static int lt8912_bridge_attach(struct drm_bridge *bridge, 539 enum drm_bridge_attach_flags flags) 540 { 541 struct lt8912 *lt = bridge_to_lt8912(bridge); 542 int ret; 543 544 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 545 ret = lt8912_bridge_connector_init(bridge); 546 if (ret) { 547 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret); 548 return ret; 549 } 550 } 551 552 ret = lt8912_hard_power_on(lt); 553 if (ret) 554 return ret; 555 556 ret = lt8912_soft_power_on(lt); 557 if (ret) 558 goto error; 559 560 ret = lt8912_attach_dsi(lt); 561 if (ret) 562 goto error; 563 564 lt->is_attached = true; 565 566 return 0; 567 568 error: 569 lt8912_hard_power_off(lt); 570 return ret; 571 } 572 573 static void lt8912_bridge_detach(struct drm_bridge *bridge) 574 { 575 struct lt8912 *lt = bridge_to_lt8912(bridge); 576 577 if (lt->is_attached) { 578 lt8912_detach_dsi(lt); 579 lt8912_hard_power_off(lt); 580 drm_connector_unregister(<->connector); 581 drm_connector_cleanup(<->connector); 582 } 583 } 584 585 static enum drm_connector_status 586 lt8912_bridge_detect(struct drm_bridge *bridge) 587 { 588 struct lt8912 *lt = bridge_to_lt8912(bridge); 589 590 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 591 return drm_bridge_detect(lt->hdmi_port); 592 593 return lt8912_check_cable_status(lt); 594 } 595 596 static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge, 597 struct drm_connector *connector) 598 { 599 struct lt8912 *lt = bridge_to_lt8912(bridge); 600 601 /* 602 * edid must be read through the ddc bus but it must be 603 * given to the hdmi connector node. 604 */ 605 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) 606 return drm_bridge_get_edid(lt->hdmi_port, connector); 607 608 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n"); 609 return NULL; 610 } 611 612 static const struct drm_bridge_funcs lt8912_bridge_funcs = { 613 .attach = lt8912_bridge_attach, 614 .detach = lt8912_bridge_detach, 615 .mode_set = lt8912_bridge_mode_set, 616 .enable = lt8912_bridge_enable, 617 .detect = lt8912_bridge_detect, 618 .get_edid = lt8912_bridge_get_edid, 619 }; 620 621 static int lt8912_parse_dt(struct lt8912 *lt) 622 { 623 struct gpio_desc *gp_reset; 624 struct device *dev = lt->dev; 625 int ret; 626 int data_lanes; 627 struct device_node *port_node; 628 struct device_node *endpoint; 629 630 gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); 631 if (IS_ERR(gp_reset)) { 632 ret = PTR_ERR(gp_reset); 633 if (ret != -EPROBE_DEFER) 634 dev_err(dev, "Failed to get reset gpio: %d\n", ret); 635 return ret; 636 } 637 lt->gp_reset = gp_reset; 638 639 endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1); 640 if (!endpoint) 641 return -ENODEV; 642 643 data_lanes = of_property_count_u32_elems(endpoint, "data-lanes"); 644 of_node_put(endpoint); 645 if (data_lanes < 0) { 646 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__); 647 return data_lanes; 648 } 649 lt->data_lanes = data_lanes; 650 651 lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1); 652 if (!lt->host_node) { 653 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__); 654 return -ENODEV; 655 } 656 657 port_node = of_graph_get_remote_node(dev->of_node, 1, -1); 658 if (!port_node) { 659 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__); 660 ret = -ENODEV; 661 goto err_free_host_node; 662 } 663 664 lt->hdmi_port = of_drm_find_bridge(port_node); 665 if (!lt->hdmi_port) { 666 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); 667 ret = -ENODEV; 668 goto err_free_host_node; 669 } 670 671 if (!of_device_is_compatible(port_node, "hdmi-connector")) { 672 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); 673 ret = -EINVAL; 674 goto err_free_host_node; 675 } 676 677 of_node_put(port_node); 678 return 0; 679 680 err_free_host_node: 681 of_node_put(port_node); 682 of_node_put(lt->host_node); 683 return ret; 684 } 685 686 static int lt8912_put_dt(struct lt8912 *lt) 687 { 688 of_node_put(lt->host_node); 689 return 0; 690 } 691 692 static int lt8912_probe(struct i2c_client *client, 693 const struct i2c_device_id *id) 694 { 695 static struct lt8912 *lt; 696 int ret = 0; 697 struct device *dev = &client->dev; 698 699 lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL); 700 if (!lt) 701 return -ENOMEM; 702 703 lt->dev = dev; 704 lt->i2c_client[0] = client; 705 706 ret = lt8912_parse_dt(lt); 707 if (ret) 708 goto err_dt_parse; 709 710 ret = lt8912_init_i2c(lt, client); 711 if (ret) 712 goto err_i2c; 713 714 i2c_set_clientdata(client, lt); 715 716 lt->bridge.funcs = <8912_bridge_funcs; 717 lt->bridge.of_node = dev->of_node; 718 lt->bridge.ops = (DRM_BRIDGE_OP_EDID | 719 DRM_BRIDGE_OP_DETECT); 720 721 drm_bridge_add(<->bridge); 722 723 return 0; 724 725 err_i2c: 726 lt8912_put_dt(lt); 727 err_dt_parse: 728 return ret; 729 } 730 731 static int lt8912_remove(struct i2c_client *client) 732 { 733 struct lt8912 *lt = i2c_get_clientdata(client); 734 735 lt8912_bridge_detach(<->bridge); 736 drm_bridge_remove(<->bridge); 737 lt8912_free_i2c(lt); 738 lt8912_put_dt(lt); 739 return 0; 740 } 741 742 static const struct of_device_id lt8912_dt_match[] = { 743 {.compatible = "lontium,lt8912b"}, 744 {} 745 }; 746 MODULE_DEVICE_TABLE(of, lt8912_dt_match); 747 748 static const struct i2c_device_id lt8912_id[] = { 749 {"lt8912", 0}, 750 {}, 751 }; 752 MODULE_DEVICE_TABLE(i2c, lt8912_id); 753 754 static struct i2c_driver lt8912_i2c_driver = { 755 .driver = { 756 .name = "lt8912", 757 .of_match_table = lt8912_dt_match, 758 .owner = THIS_MODULE, 759 }, 760 .probe = lt8912_probe, 761 .remove = lt8912_remove, 762 .id_table = lt8912_id, 763 }; 764 module_i2c_driver(lt8912_i2c_driver); 765 766 MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>"); 767 MODULE_DESCRIPTION("lt8912 drm driver"); 768 MODULE_LICENSE("GPL v2"); 769