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 /* enable LVDS output with some hardcoded configuration, not required for the HDMI output */ 169 static int lt8912_write_lvds_config(struct lt8912 *lt) 170 { 171 const struct reg_sequence seq[] = { 172 // lvds power up 173 {0x44, 0x30}, 174 {0x51, 0x05}, 175 176 // core pll bypass 177 {0x50, 0x24}, // cp=50uA 178 {0x51, 0x2d}, // Pix_clk as reference, second order passive LPF PLL 179 {0x52, 0x04}, // loopdiv=0, use second-order PLL 180 {0x69, 0x0e}, // CP_PRESET_DIV_RATIO 181 {0x69, 0x8e}, 182 {0x6a, 0x00}, 183 {0x6c, 0xb8}, // RGD_CP_SOFT_K_EN,RGD_CP_SOFT_K[13:8] 184 {0x6b, 0x51}, 185 186 {0x04, 0xfb}, // core pll reset 187 {0x04, 0xff}, 188 189 // scaler bypass 190 {0x7f, 0x00}, // disable scaler 191 {0xa8, 0x13}, // 0x13: JEIDA, 0x33: VESA 192 193 {0x02, 0xf7}, // lvds pll reset 194 {0x02, 0xff}, 195 {0x03, 0xcf}, 196 {0x03, 0xff}, 197 }; 198 199 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); 200 }; 201 202 static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) 203 { 204 return container_of(b, struct lt8912, bridge); 205 } 206 207 static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c) 208 { 209 return container_of(c, struct lt8912, connector); 210 } 211 212 static const struct regmap_config lt8912_regmap_config = { 213 .reg_bits = 8, 214 .val_bits = 8, 215 .max_register = 0xff, 216 }; 217 218 static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client) 219 { 220 unsigned int i; 221 /* 222 * At this time we only initialize 2 chips, but the lt8912 provides 223 * a third interface for the audio over HDMI configuration. 224 */ 225 struct i2c_board_info info[] = { 226 { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), }, 227 { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), }, 228 }; 229 230 if (!lt) 231 return -ENODEV; 232 233 for (i = 0; i < ARRAY_SIZE(info); i++) { 234 if (i > 0) { 235 lt->i2c_client[i] = i2c_new_dummy_device(client->adapter, 236 info[i].addr); 237 if (IS_ERR(lt->i2c_client[i])) 238 return PTR_ERR(lt->i2c_client[i]); 239 } 240 241 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i], 242 <8912_regmap_config); 243 if (IS_ERR(lt->regmap[i])) 244 return PTR_ERR(lt->regmap[i]); 245 } 246 return 0; 247 } 248 249 static int lt8912_free_i2c(struct lt8912 *lt) 250 { 251 unsigned int i; 252 253 for (i = 1; i < I2C_MAX_IDX; i++) 254 i2c_unregister_device(lt->i2c_client[i]); 255 256 return 0; 257 } 258 259 static int lt8912_hard_power_on(struct lt8912 *lt) 260 { 261 gpiod_set_value_cansleep(lt->gp_reset, 0); 262 msleep(20); 263 264 return 0; 265 } 266 267 static void lt8912_hard_power_off(struct lt8912 *lt) 268 { 269 gpiod_set_value_cansleep(lt->gp_reset, 1); 270 msleep(20); 271 lt->is_power_on = false; 272 } 273 274 static int lt8912_video_setup(struct lt8912 *lt) 275 { 276 u32 hactive, h_total, hpw, hfp, hbp; 277 u32 vactive, v_total, vpw, vfp, vbp; 278 u8 settle = 0x08; 279 int ret, hsync_activehigh, vsync_activehigh; 280 281 if (!lt) 282 return -EINVAL; 283 284 hactive = lt->mode.hactive; 285 hfp = lt->mode.hfront_porch; 286 hpw = lt->mode.hsync_len; 287 hbp = lt->mode.hback_porch; 288 h_total = hactive + hfp + hpw + hbp; 289 hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH; 290 291 vactive = lt->mode.vactive; 292 vfp = lt->mode.vfront_porch; 293 vpw = lt->mode.vsync_len; 294 vbp = lt->mode.vback_porch; 295 v_total = vactive + vfp + vpw + vbp; 296 vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH; 297 298 if (vactive <= 600) 299 settle = 0x04; 300 else if (vactive == 1080) 301 settle = 0x0a; 302 303 ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01); 304 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle); 305 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw); 306 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw); 307 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff); 308 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8); 309 310 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c); 311 312 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff); 313 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8); 314 315 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff); 316 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8); 317 318 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff); 319 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8); 320 321 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff); 322 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8); 323 324 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff); 325 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8); 326 327 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff); 328 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8); 329 330 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0), 331 vsync_activehigh ? BIT(0) : 0); 332 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1), 333 hsync_activehigh ? BIT(1) : 0); 334 335 return ret; 336 } 337 338 static int lt8912_soft_power_on(struct lt8912 *lt) 339 { 340 if (!lt->is_power_on) { 341 u32 lanes = lt->data_lanes; 342 343 lt8912_write_init_config(lt); 344 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3); 345 346 lt8912_write_mipi_basic_config(lt); 347 348 lt->is_power_on = true; 349 } 350 351 return 0; 352 } 353 354 static int lt8912_video_on(struct lt8912 *lt) 355 { 356 int ret; 357 358 ret = lt8912_video_setup(lt); 359 if (ret < 0) 360 goto end; 361 362 ret = lt8912_write_dds_config(lt); 363 if (ret < 0) 364 goto end; 365 366 ret = lt8912_write_rxlogicres_config(lt); 367 if (ret < 0) 368 goto end; 369 370 ret = lt8912_write_lvds_config(lt); 371 if (ret < 0) 372 goto end; 373 374 end: 375 return ret; 376 } 377 378 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt) 379 { 380 int ret; 381 unsigned int reg_val; 382 383 ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val); 384 if (ret) 385 return connector_status_unknown; 386 387 if (reg_val & BIT(7)) 388 return connector_status_connected; 389 390 return connector_status_disconnected; 391 } 392 393 static enum drm_connector_status 394 lt8912_connector_detect(struct drm_connector *connector, bool force) 395 { 396 struct lt8912 *lt = connector_to_lt8912(connector); 397 398 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 399 return drm_bridge_detect(lt->hdmi_port); 400 401 return lt8912_check_cable_status(lt); 402 } 403 404 static const struct drm_connector_funcs lt8912_connector_funcs = { 405 .detect = lt8912_connector_detect, 406 .fill_modes = drm_helper_probe_single_connector_modes, 407 .destroy = drm_connector_cleanup, 408 .reset = drm_atomic_helper_connector_reset, 409 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 410 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 411 }; 412 413 static enum drm_mode_status 414 lt8912_connector_mode_valid(struct drm_connector *connector, 415 struct drm_display_mode *mode) 416 { 417 if (mode->clock > 150000) 418 return MODE_CLOCK_HIGH; 419 420 if (mode->hdisplay > 1920) 421 return MODE_BAD_HVALUE; 422 423 if (mode->vdisplay > 1080) 424 return MODE_BAD_VVALUE; 425 426 return MODE_OK; 427 } 428 429 static int lt8912_connector_get_modes(struct drm_connector *connector) 430 { 431 struct edid *edid; 432 int ret = -1; 433 int num = 0; 434 struct lt8912 *lt = connector_to_lt8912(connector); 435 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 436 437 edid = drm_bridge_get_edid(lt->hdmi_port, connector); 438 if (edid) { 439 drm_connector_update_edid_property(connector, edid); 440 num = drm_add_edid_modes(connector, edid); 441 } else { 442 return ret; 443 } 444 445 ret = drm_display_info_set_bus_formats(&connector->display_info, 446 &bus_format, 1); 447 if (ret) 448 num = ret; 449 450 kfree(edid); 451 return num; 452 } 453 454 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { 455 .get_modes = lt8912_connector_get_modes, 456 .mode_valid = lt8912_connector_mode_valid, 457 }; 458 459 static void lt8912_bridge_mode_set(struct drm_bridge *bridge, 460 const struct drm_display_mode *mode, 461 const struct drm_display_mode *adj) 462 { 463 struct lt8912 *lt = bridge_to_lt8912(bridge); 464 465 drm_display_mode_to_videomode(adj, <->mode); 466 } 467 468 static void lt8912_bridge_enable(struct drm_bridge *bridge) 469 { 470 struct lt8912 *lt = bridge_to_lt8912(bridge); 471 472 lt8912_video_on(lt); 473 } 474 475 static int lt8912_attach_dsi(struct lt8912 *lt) 476 { 477 struct device *dev = lt->dev; 478 struct mipi_dsi_host *host; 479 struct mipi_dsi_device *dsi; 480 int ret = -1; 481 const struct mipi_dsi_device_info info = { .type = "lt8912", 482 .channel = 0, 483 .node = NULL, 484 }; 485 486 host = of_find_mipi_dsi_host_by_node(lt->host_node); 487 if (!host) { 488 dev_err(dev, "failed to find dsi host\n"); 489 return -EPROBE_DEFER; 490 } 491 492 dsi = devm_mipi_dsi_device_register_full(dev, host, &info); 493 if (IS_ERR(dsi)) { 494 ret = PTR_ERR(dsi); 495 dev_err(dev, "failed to create dsi device (%d)\n", ret); 496 return ret; 497 } 498 499 lt->dsi = dsi; 500 501 dsi->lanes = lt->data_lanes; 502 dsi->format = MIPI_DSI_FMT_RGB888; 503 504 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | 505 MIPI_DSI_MODE_VIDEO_BURST | 506 MIPI_DSI_MODE_LPM | 507 MIPI_DSI_MODE_NO_EOT_PACKET; 508 509 ret = devm_mipi_dsi_attach(dev, dsi); 510 if (ret < 0) { 511 dev_err(dev, "failed to attach dsi to host\n"); 512 return ret; 513 } 514 515 return 0; 516 } 517 518 static int lt8912_bridge_connector_init(struct drm_bridge *bridge) 519 { 520 int ret; 521 struct lt8912 *lt = bridge_to_lt8912(bridge); 522 struct drm_connector *connector = <->connector; 523 524 connector->polled = DRM_CONNECTOR_POLL_CONNECT | 525 DRM_CONNECTOR_POLL_DISCONNECT; 526 527 ret = drm_connector_init(bridge->dev, connector, 528 <8912_connector_funcs, 529 lt->hdmi_port->type); 530 if (ret) 531 goto exit; 532 533 drm_connector_helper_add(connector, <8912_connector_helper_funcs); 534 535 connector->dpms = DRM_MODE_DPMS_OFF; 536 drm_connector_attach_encoder(connector, bridge->encoder); 537 538 exit: 539 return ret; 540 } 541 542 static int lt8912_bridge_attach(struct drm_bridge *bridge, 543 enum drm_bridge_attach_flags flags) 544 { 545 struct lt8912 *lt = bridge_to_lt8912(bridge); 546 int ret; 547 548 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 549 ret = lt8912_bridge_connector_init(bridge); 550 if (ret) { 551 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret); 552 return ret; 553 } 554 } 555 556 ret = lt8912_hard_power_on(lt); 557 if (ret) 558 return ret; 559 560 ret = lt8912_soft_power_on(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_hard_power_off(lt); 579 drm_connector_unregister(<->connector); 580 drm_connector_cleanup(<->connector); 581 } 582 } 583 584 static enum drm_connector_status 585 lt8912_bridge_detect(struct drm_bridge *bridge) 586 { 587 struct lt8912 *lt = bridge_to_lt8912(bridge); 588 589 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 590 return drm_bridge_detect(lt->hdmi_port); 591 592 return lt8912_check_cable_status(lt); 593 } 594 595 static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge, 596 struct drm_connector *connector) 597 { 598 struct lt8912 *lt = bridge_to_lt8912(bridge); 599 600 /* 601 * edid must be read through the ddc bus but it must be 602 * given to the hdmi connector node. 603 */ 604 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) 605 return drm_bridge_get_edid(lt->hdmi_port, connector); 606 607 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n"); 608 return NULL; 609 } 610 611 static const struct drm_bridge_funcs lt8912_bridge_funcs = { 612 .attach = lt8912_bridge_attach, 613 .detach = lt8912_bridge_detach, 614 .mode_set = lt8912_bridge_mode_set, 615 .enable = lt8912_bridge_enable, 616 .detect = lt8912_bridge_detect, 617 .get_edid = lt8912_bridge_get_edid, 618 }; 619 620 static int lt8912_parse_dt(struct lt8912 *lt) 621 { 622 struct gpio_desc *gp_reset; 623 struct device *dev = lt->dev; 624 int ret; 625 int data_lanes; 626 struct device_node *port_node; 627 628 gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); 629 if (IS_ERR(gp_reset)) { 630 ret = PTR_ERR(gp_reset); 631 if (ret != -EPROBE_DEFER) 632 dev_err(dev, "Failed to get reset gpio: %d\n", ret); 633 return ret; 634 } 635 lt->gp_reset = gp_reset; 636 637 data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4); 638 if (data_lanes < 0) { 639 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__); 640 return data_lanes; 641 } 642 643 lt->data_lanes = data_lanes; 644 645 lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1); 646 if (!lt->host_node) { 647 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__); 648 return -ENODEV; 649 } 650 651 port_node = of_graph_get_remote_node(dev->of_node, 1, -1); 652 if (!port_node) { 653 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__); 654 ret = -ENODEV; 655 goto err_free_host_node; 656 } 657 658 lt->hdmi_port = of_drm_find_bridge(port_node); 659 if (!lt->hdmi_port) { 660 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); 661 ret = -ENODEV; 662 goto err_free_host_node; 663 } 664 665 if (!of_device_is_compatible(port_node, "hdmi-connector")) { 666 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); 667 ret = -EINVAL; 668 goto err_free_host_node; 669 } 670 671 of_node_put(port_node); 672 return 0; 673 674 err_free_host_node: 675 of_node_put(port_node); 676 of_node_put(lt->host_node); 677 return ret; 678 } 679 680 static int lt8912_put_dt(struct lt8912 *lt) 681 { 682 of_node_put(lt->host_node); 683 return 0; 684 } 685 686 static int lt8912_probe(struct i2c_client *client, 687 const struct i2c_device_id *id) 688 { 689 static struct lt8912 *lt; 690 int ret = 0; 691 struct device *dev = &client->dev; 692 693 lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL); 694 if (!lt) 695 return -ENOMEM; 696 697 lt->dev = dev; 698 lt->i2c_client[0] = client; 699 700 ret = lt8912_parse_dt(lt); 701 if (ret) 702 goto err_dt_parse; 703 704 ret = lt8912_init_i2c(lt, client); 705 if (ret) 706 goto err_i2c; 707 708 i2c_set_clientdata(client, lt); 709 710 lt->bridge.funcs = <8912_bridge_funcs; 711 lt->bridge.of_node = dev->of_node; 712 lt->bridge.ops = (DRM_BRIDGE_OP_EDID | 713 DRM_BRIDGE_OP_DETECT); 714 715 drm_bridge_add(<->bridge); 716 717 ret = lt8912_attach_dsi(lt); 718 if (ret) 719 goto err_attach; 720 721 return 0; 722 723 err_attach: 724 drm_bridge_remove(<->bridge); 725 lt8912_free_i2c(lt); 726 err_i2c: 727 lt8912_put_dt(lt); 728 err_dt_parse: 729 return ret; 730 } 731 732 static int lt8912_remove(struct i2c_client *client) 733 { 734 struct lt8912 *lt = i2c_get_clientdata(client); 735 736 lt8912_bridge_detach(<->bridge); 737 drm_bridge_remove(<->bridge); 738 lt8912_free_i2c(lt); 739 lt8912_put_dt(lt); 740 return 0; 741 } 742 743 static const struct of_device_id lt8912_dt_match[] = { 744 {.compatible = "lontium,lt8912b"}, 745 {} 746 }; 747 MODULE_DEVICE_TABLE(of, lt8912_dt_match); 748 749 static const struct i2c_device_id lt8912_id[] = { 750 {"lt8912", 0}, 751 {}, 752 }; 753 MODULE_DEVICE_TABLE(i2c, lt8912_id); 754 755 static struct i2c_driver lt8912_i2c_driver = { 756 .driver = { 757 .name = "lt8912", 758 .of_match_table = lt8912_dt_match, 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