1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright(c) 2016, Analogix Semiconductor. 4 * Copyright(c) 2017, Icenowy Zheng <icenowy@aosc.io> 5 * 6 * Based on anx7808 driver obtained from chromeos with copyright: 7 * Copyright(c) 2013, Google Inc. 8 */ 9 #include <linux/delay.h> 10 #include <linux/err.h> 11 #include <linux/gpio/consumer.h> 12 #include <linux/i2c.h> 13 #include <linux/interrupt.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/of_platform.h> 17 #include <linux/regmap.h> 18 #include <linux/regulator/consumer.h> 19 #include <linux/types.h> 20 21 #include <drm/drm_atomic_helper.h> 22 #include <drm/drm_crtc.h> 23 #include <drm/drm_crtc_helper.h> 24 #include <drm/drm_dp_helper.h> 25 #include <drm/drm_edid.h> 26 #include <drm/drm_of.h> 27 #include <drm/drm_panel.h> 28 #include <drm/drm_print.h> 29 #include <drm/drm_probe_helper.h> 30 31 #include "analogix-i2c-dptx.h" 32 #include "analogix-i2c-txcommon.h" 33 34 #define POLL_DELAY 50000 /* us */ 35 #define POLL_TIMEOUT 5000000 /* us */ 36 37 #define I2C_IDX_DPTX 0 38 #define I2C_IDX_TXCOM 1 39 40 static const u8 anx6345_i2c_addresses[] = { 41 [I2C_IDX_DPTX] = 0x70, 42 [I2C_IDX_TXCOM] = 0x72, 43 }; 44 #define I2C_NUM_ADDRESSES ARRAY_SIZE(anx6345_i2c_addresses) 45 46 struct anx6345 { 47 struct drm_dp_aux aux; 48 struct drm_bridge bridge; 49 struct i2c_client *client; 50 struct edid *edid; 51 struct drm_connector connector; 52 struct drm_dp_link link; 53 struct drm_panel *panel; 54 struct regulator *dvdd12; 55 struct regulator *dvdd25; 56 struct gpio_desc *gpiod_reset; 57 struct mutex lock; /* protect EDID access */ 58 59 /* I2C Slave addresses of ANX6345 are mapped as DPTX and SYS */ 60 struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES]; 61 struct regmap *map[I2C_NUM_ADDRESSES]; 62 63 u16 chipid; 64 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 65 66 bool powered; 67 }; 68 69 static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c) 70 { 71 return container_of(c, struct anx6345, connector); 72 } 73 74 static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge) 75 { 76 return container_of(bridge, struct anx6345, bridge); 77 } 78 79 static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask) 80 { 81 return regmap_update_bits(map, reg, mask, mask); 82 } 83 84 static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask) 85 { 86 return regmap_update_bits(map, reg, mask, 0); 87 } 88 89 static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux, 90 struct drm_dp_aux_msg *msg) 91 { 92 struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux); 93 94 return anx_dp_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg); 95 } 96 97 static int anx6345_dp_link_training(struct anx6345 *anx6345) 98 { 99 unsigned int value; 100 u8 dp_bw; 101 int err; 102 103 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 104 SP_POWERDOWN_CTRL_REG, 105 SP_TOTAL_PD); 106 if (err) 107 return err; 108 109 err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw); 110 if (err < 0) 111 return err; 112 113 switch (dp_bw) { 114 case DP_LINK_BW_1_62: 115 case DP_LINK_BW_2_7: 116 break; 117 118 default: 119 DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw); 120 return -EINVAL; 121 } 122 123 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 124 SP_VIDEO_MUTE); 125 if (err) 126 return err; 127 128 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 129 SP_VID_CTRL1_REG, SP_VIDEO_EN); 130 if (err) 131 return err; 132 133 /* Get DPCD info */ 134 err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV, 135 &anx6345->dpcd, DP_RECEIVER_CAP_SIZE); 136 if (err < 0) { 137 DRM_ERROR("Failed to read DPCD: %d\n", err); 138 return err; 139 } 140 141 /* Clear channel x SERDES power down */ 142 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], 143 SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD); 144 if (err) 145 return err; 146 147 /* Check link capabilities */ 148 err = drm_dp_link_probe(&anx6345->aux, &anx6345->link); 149 if (err < 0) { 150 DRM_ERROR("Failed to probe link capabilities: %d\n", err); 151 return err; 152 } 153 154 /* Power up the sink */ 155 err = drm_dp_link_power_up(&anx6345->aux, &anx6345->link); 156 if (err < 0) { 157 DRM_ERROR("Failed to power up DisplayPort link: %d\n", err); 158 return err; 159 } 160 161 /* Possibly enable downspread on the sink */ 162 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 163 SP_DP_DOWNSPREAD_CTRL1_REG, 0); 164 if (err) 165 return err; 166 167 if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) { 168 DRM_DEBUG("Enable downspread on the sink\n"); 169 /* 4000PPM */ 170 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 171 SP_DP_DOWNSPREAD_CTRL1_REG, 8); 172 if (err) 173 return err; 174 175 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 176 DP_SPREAD_AMP_0_5); 177 if (err < 0) 178 return err; 179 } else { 180 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0); 181 if (err < 0) 182 return err; 183 } 184 185 /* Set the lane count and the link rate on the sink */ 186 if (drm_dp_enhanced_frame_cap(anx6345->dpcd)) 187 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 188 SP_DP_SYSTEM_CTRL_BASE + 4, 189 SP_ENHANCED_MODE); 190 else 191 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], 192 SP_DP_SYSTEM_CTRL_BASE + 4, 193 SP_ENHANCED_MODE); 194 if (err) 195 return err; 196 197 value = drm_dp_link_rate_to_bw_code(anx6345->link.rate); 198 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 199 SP_DP_MAIN_LINK_BW_SET_REG, value); 200 if (err) 201 return err; 202 203 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 204 SP_DP_LANE_COUNT_SET_REG, anx6345->link.num_lanes); 205 if (err) 206 return err; 207 208 err = drm_dp_link_configure(&anx6345->aux, &anx6345->link); 209 if (err < 0) { 210 DRM_ERROR("Failed to configure DisplayPort link: %d\n", err); 211 return err; 212 } 213 214 /* Start training on the source */ 215 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG, 216 SP_LT_EN); 217 if (err) 218 return err; 219 220 return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX], 221 SP_DP_LT_CTRL_REG, 222 value, !(value & SP_DP_LT_INPROGRESS), 223 POLL_DELAY, POLL_TIMEOUT); 224 } 225 226 static int anx6345_tx_initialization(struct anx6345 *anx6345) 227 { 228 int err, i; 229 230 /* FIXME: colordepth is hardcoded for now */ 231 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG, 232 SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT); 233 if (err) 234 return err; 235 236 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0); 237 if (err) 238 return err; 239 240 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], 241 SP_ANALOG_DEBUG1_REG, 0); 242 if (err) 243 return err; 244 245 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 246 SP_DP_LINK_DEBUG_CTRL_REG, 247 SP_NEW_PRBS7 | SP_M_VID_DEBUG); 248 if (err) 249 return err; 250 251 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 252 SP_DP_ANALOG_POWER_DOWN_REG, 0); 253 if (err) 254 return err; 255 256 /* Force HPD */ 257 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 258 SP_DP_SYSTEM_CTRL_BASE + 3, 259 SP_HPD_FORCE | SP_HPD_CTRL); 260 if (err) 261 return err; 262 263 for (i = 0; i < 4; i++) { 264 /* 4 lanes */ 265 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 266 SP_DP_LANE0_LT_CTRL_REG + i, 0); 267 if (err) 268 return err; 269 } 270 271 /* Reset AUX */ 272 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], 273 SP_RESET_CTRL2_REG, SP_AUX_RST); 274 if (err) 275 return err; 276 277 return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 278 SP_RESET_CTRL2_REG, SP_AUX_RST); 279 } 280 281 static void anx6345_poweron(struct anx6345 *anx6345) 282 { 283 int err; 284 285 /* Ensure reset is asserted before starting power on sequence */ 286 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); 287 usleep_range(1000, 2000); 288 289 err = regulator_enable(anx6345->dvdd12); 290 if (err) { 291 DRM_ERROR("Failed to enable dvdd12 regulator: %d\n", 292 err); 293 return; 294 } 295 296 /* T1 - delay between VDD12 and VDD25 should be 0-2ms */ 297 usleep_range(1000, 2000); 298 299 err = regulator_enable(anx6345->dvdd25); 300 if (err) { 301 DRM_ERROR("Failed to enable dvdd25 regulator: %d\n", 302 err); 303 return; 304 } 305 306 /* T2 - delay between RESETN and all power rail stable, 307 * should be 2-5ms 308 */ 309 usleep_range(2000, 5000); 310 311 gpiod_set_value_cansleep(anx6345->gpiod_reset, 0); 312 313 /* Power on registers module */ 314 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 315 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 316 anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 317 SP_REGISTER_PD | SP_TOTAL_PD); 318 319 if (anx6345->panel) 320 drm_panel_prepare(anx6345->panel); 321 322 anx6345->powered = true; 323 } 324 325 static void anx6345_poweroff(struct anx6345 *anx6345) 326 { 327 int err; 328 329 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); 330 usleep_range(1000, 2000); 331 332 if (anx6345->panel) 333 drm_panel_unprepare(anx6345->panel); 334 335 err = regulator_disable(anx6345->dvdd25); 336 if (err) { 337 DRM_ERROR("Failed to disable dvdd25 regulator: %d\n", 338 err); 339 return; 340 } 341 342 usleep_range(5000, 10000); 343 344 err = regulator_disable(anx6345->dvdd12); 345 if (err) { 346 DRM_ERROR("Failed to disable dvdd12 regulator: %d\n", 347 err); 348 return; 349 } 350 351 usleep_range(1000, 2000); 352 353 anx6345->powered = false; 354 } 355 356 static int anx6345_start(struct anx6345 *anx6345) 357 { 358 int err; 359 360 if (!anx6345->powered) 361 anx6345_poweron(anx6345); 362 363 /* Power on needed modules */ 364 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 365 SP_POWERDOWN_CTRL_REG, 366 SP_VIDEO_PD | SP_LINK_PD); 367 368 err = anx6345_tx_initialization(anx6345); 369 if (err) { 370 DRM_ERROR("Failed eDP transmitter initialization: %d\n", err); 371 anx6345_poweroff(anx6345); 372 return err; 373 } 374 375 err = anx6345_dp_link_training(anx6345); 376 if (err) { 377 DRM_ERROR("Failed link training: %d\n", err); 378 anx6345_poweroff(anx6345); 379 return err; 380 } 381 382 /* 383 * This delay seems to help keep the hardware in a good state. Without 384 * it, there are times where it fails silently. 385 */ 386 usleep_range(10000, 15000); 387 388 return 0; 389 } 390 391 static int anx6345_config_dp_output(struct anx6345 *anx6345) 392 { 393 int err; 394 395 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 396 SP_VIDEO_MUTE); 397 if (err) 398 return err; 399 400 /* Enable DP output */ 401 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 402 SP_VIDEO_EN); 403 if (err) 404 return err; 405 406 /* Force stream valid */ 407 return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 408 SP_DP_SYSTEM_CTRL_BASE + 3, 409 SP_STRM_FORCE | SP_STRM_CTRL); 410 } 411 412 static int anx6345_get_downstream_info(struct anx6345 *anx6345) 413 { 414 u8 value; 415 int err; 416 417 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value); 418 if (err < 0) { 419 DRM_ERROR("Get sink count failed %d\n", err); 420 return err; 421 } 422 423 if (!DP_GET_SINK_COUNT(value)) { 424 DRM_ERROR("Downstream disconnected\n"); 425 return -EIO; 426 } 427 428 return 0; 429 } 430 431 static int anx6345_get_modes(struct drm_connector *connector) 432 { 433 struct anx6345 *anx6345 = connector_to_anx6345(connector); 434 int err, num_modes = 0; 435 bool power_off = false; 436 437 mutex_lock(&anx6345->lock); 438 439 if (!anx6345->edid) { 440 if (!anx6345->powered) { 441 anx6345_poweron(anx6345); 442 power_off = true; 443 } 444 445 err = anx6345_get_downstream_info(anx6345); 446 if (err) { 447 DRM_ERROR("Failed to get downstream info: %d\n", err); 448 goto unlock; 449 } 450 451 anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc); 452 if (!anx6345->edid) 453 DRM_ERROR("Failed to read EDID from panel\n"); 454 455 err = drm_connector_update_edid_property(connector, 456 anx6345->edid); 457 if (err) { 458 DRM_ERROR("Failed to update EDID property: %d\n", err); 459 goto unlock; 460 } 461 } 462 463 num_modes += drm_add_edid_modes(connector, anx6345->edid); 464 465 unlock: 466 if (power_off) 467 anx6345_poweroff(anx6345); 468 469 mutex_unlock(&anx6345->lock); 470 471 if (!num_modes && anx6345->panel) 472 num_modes += drm_panel_get_modes(anx6345->panel); 473 474 return num_modes; 475 } 476 477 static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = { 478 .get_modes = anx6345_get_modes, 479 }; 480 481 static void 482 anx6345_connector_destroy(struct drm_connector *connector) 483 { 484 struct anx6345 *anx6345 = connector_to_anx6345(connector); 485 486 if (anx6345->panel) 487 drm_panel_detach(anx6345->panel); 488 drm_connector_cleanup(connector); 489 } 490 491 static const struct drm_connector_funcs anx6345_connector_funcs = { 492 .fill_modes = drm_helper_probe_single_connector_modes, 493 .destroy = anx6345_connector_destroy, 494 .reset = drm_atomic_helper_connector_reset, 495 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 496 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 497 }; 498 499 static int anx6345_bridge_attach(struct drm_bridge *bridge) 500 { 501 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 502 int err; 503 504 if (!bridge->encoder) { 505 DRM_ERROR("Parent encoder object not found"); 506 return -ENODEV; 507 } 508 509 /* Register aux channel */ 510 anx6345->aux.name = "DP-AUX"; 511 anx6345->aux.dev = &anx6345->client->dev; 512 anx6345->aux.transfer = anx6345_aux_transfer; 513 514 err = drm_dp_aux_register(&anx6345->aux); 515 if (err < 0) { 516 DRM_ERROR("Failed to register aux channel: %d\n", err); 517 return err; 518 } 519 520 err = drm_connector_init(bridge->dev, &anx6345->connector, 521 &anx6345_connector_funcs, 522 DRM_MODE_CONNECTOR_eDP); 523 if (err) { 524 DRM_ERROR("Failed to initialize connector: %d\n", err); 525 return err; 526 } 527 528 drm_connector_helper_add(&anx6345->connector, 529 &anx6345_connector_helper_funcs); 530 531 err = drm_connector_register(&anx6345->connector); 532 if (err) { 533 DRM_ERROR("Failed to register connector: %d\n", err); 534 return err; 535 } 536 537 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD; 538 539 err = drm_connector_attach_encoder(&anx6345->connector, 540 bridge->encoder); 541 if (err) { 542 DRM_ERROR("Failed to link up connector to encoder: %d\n", err); 543 return err; 544 } 545 546 if (anx6345->panel) { 547 err = drm_panel_attach(anx6345->panel, &anx6345->connector); 548 if (err) { 549 DRM_ERROR("Failed to attach panel: %d\n", err); 550 return err; 551 } 552 } 553 554 return 0; 555 } 556 557 static enum drm_mode_status 558 anx6345_bridge_mode_valid(struct drm_bridge *bridge, 559 const struct drm_display_mode *mode) 560 { 561 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 562 return MODE_NO_INTERLACE; 563 564 /* Max 1200p at 5.4 Ghz, one lane */ 565 if (mode->clock > 154000) 566 return MODE_CLOCK_HIGH; 567 568 return MODE_OK; 569 } 570 571 static void anx6345_bridge_disable(struct drm_bridge *bridge) 572 { 573 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 574 575 /* Power off all modules except configuration registers access */ 576 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 577 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 578 if (anx6345->panel) 579 drm_panel_disable(anx6345->panel); 580 581 if (anx6345->powered) 582 anx6345_poweroff(anx6345); 583 } 584 585 static void anx6345_bridge_enable(struct drm_bridge *bridge) 586 { 587 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 588 int err; 589 590 if (anx6345->panel) 591 drm_panel_enable(anx6345->panel); 592 593 err = anx6345_start(anx6345); 594 if (err) { 595 DRM_ERROR("Failed to initialize: %d\n", err); 596 return; 597 } 598 599 err = anx6345_config_dp_output(anx6345); 600 if (err) 601 DRM_ERROR("Failed to enable DP output: %d\n", err); 602 } 603 604 static const struct drm_bridge_funcs anx6345_bridge_funcs = { 605 .attach = anx6345_bridge_attach, 606 .mode_valid = anx6345_bridge_mode_valid, 607 .disable = anx6345_bridge_disable, 608 .enable = anx6345_bridge_enable, 609 }; 610 611 static void unregister_i2c_dummy_clients(struct anx6345 *anx6345) 612 { 613 unsigned int i; 614 615 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++) 616 if (anx6345->i2c_clients[i] && 617 anx6345->i2c_clients[i]->addr != anx6345->client->addr) 618 i2c_unregister_device(anx6345->i2c_clients[i]); 619 } 620 621 static const struct regmap_config anx6345_regmap_config = { 622 .reg_bits = 8, 623 .val_bits = 8, 624 .max_register = 0xff, 625 .cache_type = REGCACHE_NONE, 626 }; 627 628 static const u16 anx6345_chipid_list[] = { 629 0x6345, 630 }; 631 632 static bool anx6345_get_chip_id(struct anx6345 *anx6345) 633 { 634 unsigned int i, idl, idh, version; 635 636 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl)) 637 return false; 638 639 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh)) 640 return false; 641 642 anx6345->chipid = (u8)idl | ((u8)idh << 8); 643 644 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG, 645 &version)) 646 return false; 647 648 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) { 649 if (anx6345->chipid == anx6345_chipid_list[i]) { 650 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n", 651 anx6345->chipid, version); 652 return true; 653 } 654 } 655 656 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n", 657 anx6345->chipid, version); 658 659 return false; 660 } 661 662 static int anx6345_i2c_probe(struct i2c_client *client, 663 const struct i2c_device_id *id) 664 { 665 struct anx6345 *anx6345; 666 struct device *dev; 667 int i, err; 668 669 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL); 670 if (!anx6345) 671 return -ENOMEM; 672 673 mutex_init(&anx6345->lock); 674 675 anx6345->bridge.of_node = client->dev.of_node; 676 677 anx6345->client = client; 678 i2c_set_clientdata(client, anx6345); 679 680 dev = &anx6345->client->dev; 681 682 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0, 683 &anx6345->panel, NULL); 684 if (err == -EPROBE_DEFER) 685 return err; 686 687 if (err) 688 DRM_DEBUG("No panel found\n"); 689 690 /* 1.2V digital core power regulator */ 691 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12-supply"); 692 if (IS_ERR(anx6345->dvdd12)) { 693 DRM_ERROR("dvdd12-supply not found\n"); 694 return PTR_ERR(anx6345->dvdd12); 695 } 696 697 /* 2.5V digital core power regulator */ 698 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25-supply"); 699 if (IS_ERR(anx6345->dvdd25)) { 700 DRM_ERROR("dvdd25-supply not found\n"); 701 return PTR_ERR(anx6345->dvdd25); 702 } 703 704 /* GPIO for chip reset */ 705 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); 706 if (IS_ERR(anx6345->gpiod_reset)) { 707 DRM_ERROR("Reset gpio not found\n"); 708 return PTR_ERR(anx6345->gpiod_reset); 709 } 710 711 /* Map slave addresses of ANX6345 */ 712 for (i = 0; i < I2C_NUM_ADDRESSES; i++) { 713 if (anx6345_i2c_addresses[i] >> 1 != client->addr) 714 anx6345->i2c_clients[i] = i2c_new_dummy(client->adapter, 715 anx6345_i2c_addresses[i] >> 1); 716 else 717 anx6345->i2c_clients[i] = client; 718 719 if (!anx6345->i2c_clients[i]) { 720 err = -ENOMEM; 721 DRM_ERROR("Failed to reserve I2C bus %02x\n", 722 anx6345_i2c_addresses[i]); 723 goto err_unregister_i2c; 724 } 725 726 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i], 727 &anx6345_regmap_config); 728 if (IS_ERR(anx6345->map[i])) { 729 err = PTR_ERR(anx6345->map[i]); 730 DRM_ERROR("Failed regmap initialization %02x\n", 731 anx6345_i2c_addresses[i]); 732 goto err_unregister_i2c; 733 } 734 } 735 736 /* Look for supported chip ID */ 737 anx6345_poweron(anx6345); 738 if (anx6345_get_chip_id(anx6345)) { 739 anx6345->bridge.funcs = &anx6345_bridge_funcs; 740 drm_bridge_add(&anx6345->bridge); 741 742 return 0; 743 } else { 744 anx6345_poweroff(anx6345); 745 err = -ENODEV; 746 } 747 748 err_unregister_i2c: 749 unregister_i2c_dummy_clients(anx6345); 750 return err; 751 } 752 753 static int anx6345_i2c_remove(struct i2c_client *client) 754 { 755 struct anx6345 *anx6345 = i2c_get_clientdata(client); 756 757 drm_bridge_remove(&anx6345->bridge); 758 759 unregister_i2c_dummy_clients(anx6345); 760 761 kfree(anx6345->edid); 762 763 mutex_destroy(&anx6345->lock); 764 765 return 0; 766 } 767 768 static const struct i2c_device_id anx6345_id[] = { 769 { "anx6345", 0 }, 770 { /* sentinel */ } 771 }; 772 MODULE_DEVICE_TABLE(i2c, anx6345_id); 773 774 static const struct of_device_id anx6345_match_table[] = { 775 { .compatible = "analogix,anx6345", }, 776 { /* sentinel */ }, 777 }; 778 MODULE_DEVICE_TABLE(of, anx6345_match_table); 779 780 static struct i2c_driver anx6345_driver = { 781 .driver = { 782 .name = "anx6345", 783 .of_match_table = of_match_ptr(anx6345_match_table), 784 }, 785 .probe = anx6345_i2c_probe, 786 .remove = anx6345_i2c_remove, 787 .id_table = anx6345_id, 788 }; 789 module_i2c_driver(anx6345_driver); 790 791 MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver"); 792 MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>"); 793 MODULE_LICENSE("GPL v2"); 794