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_MAIN], 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 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0), 335 lt->connector.display_info.is_hdmi ? BIT(0) : 0); 336 337 return ret; 338 } 339 340 static int lt8912_soft_power_on(struct lt8912 *lt) 341 { 342 if (!lt->is_power_on) { 343 u32 lanes = lt->data_lanes; 344 345 lt8912_write_init_config(lt); 346 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3); 347 348 lt8912_write_mipi_basic_config(lt); 349 350 lt->is_power_on = true; 351 } 352 353 return 0; 354 } 355 356 static int lt8912_video_on(struct lt8912 *lt) 357 { 358 int ret; 359 360 ret = lt8912_video_setup(lt); 361 if (ret < 0) 362 goto end; 363 364 ret = lt8912_write_dds_config(lt); 365 if (ret < 0) 366 goto end; 367 368 ret = lt8912_write_rxlogicres_config(lt); 369 if (ret < 0) 370 goto end; 371 372 ret = lt8912_write_lvds_config(lt); 373 if (ret < 0) 374 goto end; 375 376 end: 377 return ret; 378 } 379 380 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt) 381 { 382 int ret; 383 unsigned int reg_val; 384 385 ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val); 386 if (ret) 387 return connector_status_unknown; 388 389 if (reg_val & BIT(7)) 390 return connector_status_connected; 391 392 return connector_status_disconnected; 393 } 394 395 static enum drm_connector_status 396 lt8912_connector_detect(struct drm_connector *connector, bool force) 397 { 398 struct lt8912 *lt = connector_to_lt8912(connector); 399 400 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 401 return drm_bridge_detect(lt->hdmi_port); 402 403 return lt8912_check_cable_status(lt); 404 } 405 406 static const struct drm_connector_funcs lt8912_connector_funcs = { 407 .detect = lt8912_connector_detect, 408 .fill_modes = drm_helper_probe_single_connector_modes, 409 .destroy = drm_connector_cleanup, 410 .reset = drm_atomic_helper_connector_reset, 411 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 412 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 413 }; 414 415 static enum drm_mode_status 416 lt8912_connector_mode_valid(struct drm_connector *connector, 417 struct drm_display_mode *mode) 418 { 419 if (mode->clock > 150000) 420 return MODE_CLOCK_HIGH; 421 422 if (mode->hdisplay > 1920) 423 return MODE_BAD_HVALUE; 424 425 if (mode->vdisplay > 1080) 426 return MODE_BAD_VVALUE; 427 428 return MODE_OK; 429 } 430 431 static int lt8912_connector_get_modes(struct drm_connector *connector) 432 { 433 struct edid *edid; 434 int ret = -1; 435 int num = 0; 436 struct lt8912 *lt = connector_to_lt8912(connector); 437 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 438 439 edid = drm_bridge_get_edid(lt->hdmi_port, connector); 440 if (edid) { 441 drm_connector_update_edid_property(connector, edid); 442 num = drm_add_edid_modes(connector, edid); 443 } else { 444 return ret; 445 } 446 447 ret = drm_display_info_set_bus_formats(&connector->display_info, 448 &bus_format, 1); 449 if (ret) 450 num = ret; 451 452 kfree(edid); 453 return num; 454 } 455 456 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { 457 .get_modes = lt8912_connector_get_modes, 458 .mode_valid = lt8912_connector_mode_valid, 459 }; 460 461 static void lt8912_bridge_mode_set(struct drm_bridge *bridge, 462 const struct drm_display_mode *mode, 463 const struct drm_display_mode *adj) 464 { 465 struct lt8912 *lt = bridge_to_lt8912(bridge); 466 467 drm_display_mode_to_videomode(adj, <->mode); 468 } 469 470 static void lt8912_bridge_enable(struct drm_bridge *bridge) 471 { 472 struct lt8912 *lt = bridge_to_lt8912(bridge); 473 474 lt8912_video_on(lt); 475 } 476 477 static int lt8912_attach_dsi(struct lt8912 *lt) 478 { 479 struct device *dev = lt->dev; 480 struct mipi_dsi_host *host; 481 struct mipi_dsi_device *dsi; 482 int ret = -1; 483 const struct mipi_dsi_device_info info = { .type = "lt8912", 484 .channel = 0, 485 .node = NULL, 486 }; 487 488 host = of_find_mipi_dsi_host_by_node(lt->host_node); 489 if (!host) { 490 dev_err(dev, "failed to find dsi host\n"); 491 return -EPROBE_DEFER; 492 } 493 494 dsi = devm_mipi_dsi_device_register_full(dev, host, &info); 495 if (IS_ERR(dsi)) { 496 ret = PTR_ERR(dsi); 497 dev_err(dev, "failed to create dsi device (%d)\n", ret); 498 return ret; 499 } 500 501 lt->dsi = dsi; 502 503 dsi->lanes = lt->data_lanes; 504 dsi->format = MIPI_DSI_FMT_RGB888; 505 506 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | 507 MIPI_DSI_MODE_LPM | 508 MIPI_DSI_MODE_NO_EOT_PACKET; 509 510 ret = devm_mipi_dsi_attach(dev, dsi); 511 if (ret < 0) { 512 dev_err(dev, "failed to attach dsi to host\n"); 513 return ret; 514 } 515 516 return 0; 517 } 518 519 static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status) 520 { 521 struct lt8912 *lt = data; 522 523 if (lt->bridge.dev) 524 drm_helper_hpd_irq_event(lt->bridge.dev); 525 } 526 527 static int lt8912_bridge_connector_init(struct drm_bridge *bridge) 528 { 529 int ret; 530 struct lt8912 *lt = bridge_to_lt8912(bridge); 531 struct drm_connector *connector = <->connector; 532 533 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) { 534 drm_bridge_hpd_enable(lt->hdmi_port, lt8912_bridge_hpd_cb, lt); 535 connector->polled = DRM_CONNECTOR_POLL_HPD; 536 } else { 537 connector->polled = DRM_CONNECTOR_POLL_CONNECT | 538 DRM_CONNECTOR_POLL_DISCONNECT; 539 } 540 541 ret = drm_connector_init(bridge->dev, connector, 542 <8912_connector_funcs, 543 lt->hdmi_port->type); 544 if (ret) 545 goto exit; 546 547 drm_connector_helper_add(connector, <8912_connector_helper_funcs); 548 549 connector->dpms = DRM_MODE_DPMS_OFF; 550 drm_connector_attach_encoder(connector, bridge->encoder); 551 552 exit: 553 return ret; 554 } 555 556 static int lt8912_bridge_attach(struct drm_bridge *bridge, 557 enum drm_bridge_attach_flags flags) 558 { 559 struct lt8912 *lt = bridge_to_lt8912(bridge); 560 int ret; 561 562 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 563 ret = lt8912_bridge_connector_init(bridge); 564 if (ret) { 565 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret); 566 return ret; 567 } 568 } 569 570 ret = lt8912_hard_power_on(lt); 571 if (ret) 572 return ret; 573 574 ret = lt8912_soft_power_on(lt); 575 if (ret) 576 goto error; 577 578 lt->is_attached = true; 579 580 return 0; 581 582 error: 583 lt8912_hard_power_off(lt); 584 return ret; 585 } 586 587 static void lt8912_bridge_detach(struct drm_bridge *bridge) 588 { 589 struct lt8912 *lt = bridge_to_lt8912(bridge); 590 591 if (lt->is_attached) { 592 lt8912_hard_power_off(lt); 593 594 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) 595 drm_bridge_hpd_disable(lt->hdmi_port); 596 597 drm_connector_unregister(<->connector); 598 drm_connector_cleanup(<->connector); 599 } 600 } 601 602 static enum drm_connector_status 603 lt8912_bridge_detect(struct drm_bridge *bridge) 604 { 605 struct lt8912 *lt = bridge_to_lt8912(bridge); 606 607 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) 608 return drm_bridge_detect(lt->hdmi_port); 609 610 return lt8912_check_cable_status(lt); 611 } 612 613 static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge, 614 struct drm_connector *connector) 615 { 616 struct lt8912 *lt = bridge_to_lt8912(bridge); 617 618 /* 619 * edid must be read through the ddc bus but it must be 620 * given to the hdmi connector node. 621 */ 622 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) 623 return drm_bridge_get_edid(lt->hdmi_port, connector); 624 625 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n"); 626 return NULL; 627 } 628 629 static const struct drm_bridge_funcs lt8912_bridge_funcs = { 630 .attach = lt8912_bridge_attach, 631 .detach = lt8912_bridge_detach, 632 .mode_set = lt8912_bridge_mode_set, 633 .enable = lt8912_bridge_enable, 634 .detect = lt8912_bridge_detect, 635 .get_edid = lt8912_bridge_get_edid, 636 }; 637 638 static int lt8912_parse_dt(struct lt8912 *lt) 639 { 640 struct gpio_desc *gp_reset; 641 struct device *dev = lt->dev; 642 int ret; 643 int data_lanes; 644 struct device_node *port_node; 645 646 gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); 647 if (IS_ERR(gp_reset)) { 648 ret = PTR_ERR(gp_reset); 649 if (ret != -EPROBE_DEFER) 650 dev_err(dev, "Failed to get reset gpio: %d\n", ret); 651 return ret; 652 } 653 lt->gp_reset = gp_reset; 654 655 data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4); 656 if (data_lanes < 0) { 657 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__); 658 return data_lanes; 659 } 660 661 lt->data_lanes = data_lanes; 662 663 lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1); 664 if (!lt->host_node) { 665 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__); 666 return -ENODEV; 667 } 668 669 port_node = of_graph_get_remote_node(dev->of_node, 1, -1); 670 if (!port_node) { 671 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__); 672 ret = -ENODEV; 673 goto err_free_host_node; 674 } 675 676 lt->hdmi_port = of_drm_find_bridge(port_node); 677 if (!lt->hdmi_port) { 678 ret = -EPROBE_DEFER; 679 dev_err_probe(lt->dev, ret, "%s: Failed to get hdmi port\n", __func__); 680 goto err_free_host_node; 681 } 682 683 if (!of_device_is_compatible(port_node, "hdmi-connector")) { 684 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); 685 ret = -EINVAL; 686 goto err_free_host_node; 687 } 688 689 of_node_put(port_node); 690 return 0; 691 692 err_free_host_node: 693 of_node_put(port_node); 694 of_node_put(lt->host_node); 695 return ret; 696 } 697 698 static int lt8912_put_dt(struct lt8912 *lt) 699 { 700 of_node_put(lt->host_node); 701 return 0; 702 } 703 704 static int lt8912_probe(struct i2c_client *client) 705 { 706 static struct lt8912 *lt; 707 int ret = 0; 708 struct device *dev = &client->dev; 709 710 lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL); 711 if (!lt) 712 return -ENOMEM; 713 714 lt->dev = dev; 715 lt->i2c_client[0] = client; 716 717 ret = lt8912_parse_dt(lt); 718 if (ret) 719 goto err_dt_parse; 720 721 ret = lt8912_init_i2c(lt, client); 722 if (ret) 723 goto err_i2c; 724 725 i2c_set_clientdata(client, lt); 726 727 lt->bridge.funcs = <8912_bridge_funcs; 728 lt->bridge.of_node = dev->of_node; 729 lt->bridge.ops = (DRM_BRIDGE_OP_EDID | 730 DRM_BRIDGE_OP_DETECT); 731 732 drm_bridge_add(<->bridge); 733 734 ret = lt8912_attach_dsi(lt); 735 if (ret) 736 goto err_attach; 737 738 return 0; 739 740 err_attach: 741 drm_bridge_remove(<->bridge); 742 lt8912_free_i2c(lt); 743 err_i2c: 744 lt8912_put_dt(lt); 745 err_dt_parse: 746 return ret; 747 } 748 749 static void lt8912_remove(struct i2c_client *client) 750 { 751 struct lt8912 *lt = i2c_get_clientdata(client); 752 753 lt8912_bridge_detach(<->bridge); 754 drm_bridge_remove(<->bridge); 755 lt8912_free_i2c(lt); 756 lt8912_put_dt(lt); 757 } 758 759 static const struct of_device_id lt8912_dt_match[] = { 760 {.compatible = "lontium,lt8912b"}, 761 {} 762 }; 763 MODULE_DEVICE_TABLE(of, lt8912_dt_match); 764 765 static const struct i2c_device_id lt8912_id[] = { 766 {"lt8912", 0}, 767 {}, 768 }; 769 MODULE_DEVICE_TABLE(i2c, lt8912_id); 770 771 static struct i2c_driver lt8912_i2c_driver = { 772 .driver = { 773 .name = "lt8912", 774 .of_match_table = lt8912_dt_match, 775 }, 776 .probe = lt8912_probe, 777 .remove = lt8912_remove, 778 .id_table = lt8912_id, 779 }; 780 module_i2c_driver(lt8912_i2c_driver); 781 782 MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>"); 783 MODULE_DESCRIPTION("lt8912 drm driver"); 784 MODULE_LICENSE("GPL v2"); 785