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_bridge.h> 23 #include <drm/drm_crtc.h> 24 #include <drm/drm_crtc_helper.h> 25 #include <drm/drm_dp_helper.h> 26 #include <drm/drm_edid.h> 27 #include <drm/drm_of.h> 28 #include <drm/drm_panel.h> 29 #include <drm/drm_print.h> 30 #include <drm/drm_probe_helper.h> 31 32 #include "analogix-i2c-dptx.h" 33 #include "analogix-i2c-txcommon.h" 34 35 #define POLL_DELAY 50000 /* us */ 36 #define POLL_TIMEOUT 5000000 /* us */ 37 38 #define I2C_IDX_DPTX 0 39 #define I2C_IDX_TXCOM 1 40 41 static const u8 anx6345_i2c_addresses[] = { 42 [I2C_IDX_DPTX] = 0x70, 43 [I2C_IDX_TXCOM] = 0x72, 44 }; 45 #define I2C_NUM_ADDRESSES ARRAY_SIZE(anx6345_i2c_addresses) 46 47 struct anx6345 { 48 struct drm_dp_aux aux; 49 struct drm_bridge bridge; 50 struct i2c_client *client; 51 struct edid *edid; 52 struct drm_connector connector; 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, dpcd[2]; 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 /* 148 * Power up the sink (DP_SET_POWER register is only available on DPCD 149 * v1.1 and later). 150 */ 151 if (anx6345->dpcd[DP_DPCD_REV] >= 0x11) { 152 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SET_POWER, &dpcd[0]); 153 if (err < 0) { 154 DRM_ERROR("Failed to read DP_SET_POWER register: %d\n", 155 err); 156 return err; 157 } 158 159 dpcd[0] &= ~DP_SET_POWER_MASK; 160 dpcd[0] |= DP_SET_POWER_D0; 161 162 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_SET_POWER, dpcd[0]); 163 if (err < 0) { 164 DRM_ERROR("Failed to power up DisplayPort link: %d\n", 165 err); 166 return err; 167 } 168 169 /* 170 * According to the DP 1.1 specification, a "Sink Device must 171 * exit the power saving state within 1 ms" (Section 2.5.3.1, 172 * Table 5-52, "Sink Control Field" (register 0x600). 173 */ 174 usleep_range(1000, 2000); 175 } 176 177 /* Possibly enable downspread on the sink */ 178 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 179 SP_DP_DOWNSPREAD_CTRL1_REG, 0); 180 if (err) 181 return err; 182 183 if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) { 184 DRM_DEBUG("Enable downspread on the sink\n"); 185 /* 4000PPM */ 186 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 187 SP_DP_DOWNSPREAD_CTRL1_REG, 8); 188 if (err) 189 return err; 190 191 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 192 DP_SPREAD_AMP_0_5); 193 if (err < 0) 194 return err; 195 } else { 196 err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0); 197 if (err < 0) 198 return err; 199 } 200 201 /* Set the lane count and the link rate on the sink */ 202 if (drm_dp_enhanced_frame_cap(anx6345->dpcd)) 203 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 204 SP_DP_SYSTEM_CTRL_BASE + 4, 205 SP_ENHANCED_MODE); 206 else 207 err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX], 208 SP_DP_SYSTEM_CTRL_BASE + 4, 209 SP_ENHANCED_MODE); 210 if (err) 211 return err; 212 213 dpcd[0] = dp_bw; 214 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 215 SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]); 216 if (err) 217 return err; 218 219 dpcd[1] = drm_dp_max_lane_count(anx6345->dpcd); 220 221 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 222 SP_DP_LANE_COUNT_SET_REG, dpcd[1]); 223 if (err) 224 return err; 225 226 if (drm_dp_enhanced_frame_cap(anx6345->dpcd)) 227 dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 228 229 err = drm_dp_dpcd_write(&anx6345->aux, DP_LINK_BW_SET, dpcd, 230 sizeof(dpcd)); 231 232 if (err < 0) { 233 DRM_ERROR("Failed to configure link: %d\n", err); 234 return err; 235 } 236 237 /* Start training on the source */ 238 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG, 239 SP_LT_EN); 240 if (err) 241 return err; 242 243 return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX], 244 SP_DP_LT_CTRL_REG, 245 value, !(value & SP_DP_LT_INPROGRESS), 246 POLL_DELAY, POLL_TIMEOUT); 247 } 248 249 static int anx6345_tx_initialization(struct anx6345 *anx6345) 250 { 251 int err, i; 252 253 /* FIXME: colordepth is hardcoded for now */ 254 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG, 255 SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT); 256 if (err) 257 return err; 258 259 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0); 260 if (err) 261 return err; 262 263 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], 264 SP_ANALOG_DEBUG1_REG, 0); 265 if (err) 266 return err; 267 268 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 269 SP_DP_LINK_DEBUG_CTRL_REG, 270 SP_NEW_PRBS7 | SP_M_VID_DEBUG); 271 if (err) 272 return err; 273 274 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 275 SP_DP_ANALOG_POWER_DOWN_REG, 0); 276 if (err) 277 return err; 278 279 /* Force HPD */ 280 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 281 SP_DP_SYSTEM_CTRL_BASE + 3, 282 SP_HPD_FORCE | SP_HPD_CTRL); 283 if (err) 284 return err; 285 286 for (i = 0; i < 4; i++) { 287 /* 4 lanes */ 288 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 289 SP_DP_LANE0_LT_CTRL_REG + i, 0); 290 if (err) 291 return err; 292 } 293 294 /* Reset AUX */ 295 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], 296 SP_RESET_CTRL2_REG, SP_AUX_RST); 297 if (err) 298 return err; 299 300 return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 301 SP_RESET_CTRL2_REG, SP_AUX_RST); 302 } 303 304 static void anx6345_poweron(struct anx6345 *anx6345) 305 { 306 int err; 307 308 /* Ensure reset is asserted before starting power on sequence */ 309 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); 310 usleep_range(1000, 2000); 311 312 err = regulator_enable(anx6345->dvdd12); 313 if (err) { 314 DRM_ERROR("Failed to enable dvdd12 regulator: %d\n", 315 err); 316 return; 317 } 318 319 /* T1 - delay between VDD12 and VDD25 should be 0-2ms */ 320 usleep_range(1000, 2000); 321 322 err = regulator_enable(anx6345->dvdd25); 323 if (err) { 324 DRM_ERROR("Failed to enable dvdd25 regulator: %d\n", 325 err); 326 return; 327 } 328 329 /* T2 - delay between RESETN and all power rail stable, 330 * should be 2-5ms 331 */ 332 usleep_range(2000, 5000); 333 334 gpiod_set_value_cansleep(anx6345->gpiod_reset, 0); 335 336 /* Power on registers module */ 337 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 338 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 339 anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 340 SP_REGISTER_PD | SP_TOTAL_PD); 341 342 if (anx6345->panel) 343 drm_panel_prepare(anx6345->panel); 344 345 anx6345->powered = true; 346 } 347 348 static void anx6345_poweroff(struct anx6345 *anx6345) 349 { 350 int err; 351 352 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); 353 usleep_range(1000, 2000); 354 355 if (anx6345->panel) 356 drm_panel_unprepare(anx6345->panel); 357 358 err = regulator_disable(anx6345->dvdd25); 359 if (err) { 360 DRM_ERROR("Failed to disable dvdd25 regulator: %d\n", 361 err); 362 return; 363 } 364 365 usleep_range(5000, 10000); 366 367 err = regulator_disable(anx6345->dvdd12); 368 if (err) { 369 DRM_ERROR("Failed to disable dvdd12 regulator: %d\n", 370 err); 371 return; 372 } 373 374 usleep_range(1000, 2000); 375 376 anx6345->powered = false; 377 } 378 379 static int anx6345_start(struct anx6345 *anx6345) 380 { 381 int err; 382 383 if (!anx6345->powered) 384 anx6345_poweron(anx6345); 385 386 /* Power on needed modules */ 387 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 388 SP_POWERDOWN_CTRL_REG, 389 SP_VIDEO_PD | SP_LINK_PD); 390 391 err = anx6345_tx_initialization(anx6345); 392 if (err) { 393 DRM_ERROR("Failed eDP transmitter initialization: %d\n", err); 394 anx6345_poweroff(anx6345); 395 return err; 396 } 397 398 err = anx6345_dp_link_training(anx6345); 399 if (err) { 400 DRM_ERROR("Failed link training: %d\n", err); 401 anx6345_poweroff(anx6345); 402 return err; 403 } 404 405 /* 406 * This delay seems to help keep the hardware in a good state. Without 407 * it, there are times where it fails silently. 408 */ 409 usleep_range(10000, 15000); 410 411 return 0; 412 } 413 414 static int anx6345_config_dp_output(struct anx6345 *anx6345) 415 { 416 int err; 417 418 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 419 SP_VIDEO_MUTE); 420 if (err) 421 return err; 422 423 /* Enable DP output */ 424 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 425 SP_VIDEO_EN); 426 if (err) 427 return err; 428 429 /* Force stream valid */ 430 return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 431 SP_DP_SYSTEM_CTRL_BASE + 3, 432 SP_STRM_FORCE | SP_STRM_CTRL); 433 } 434 435 static int anx6345_get_downstream_info(struct anx6345 *anx6345) 436 { 437 u8 value; 438 int err; 439 440 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value); 441 if (err < 0) { 442 DRM_ERROR("Get sink count failed %d\n", err); 443 return err; 444 } 445 446 if (!DP_GET_SINK_COUNT(value)) { 447 DRM_ERROR("Downstream disconnected\n"); 448 return -EIO; 449 } 450 451 return 0; 452 } 453 454 static int anx6345_get_modes(struct drm_connector *connector) 455 { 456 struct anx6345 *anx6345 = connector_to_anx6345(connector); 457 int err, num_modes = 0; 458 bool power_off = false; 459 460 mutex_lock(&anx6345->lock); 461 462 if (!anx6345->edid) { 463 if (!anx6345->powered) { 464 anx6345_poweron(anx6345); 465 power_off = true; 466 } 467 468 err = anx6345_get_downstream_info(anx6345); 469 if (err) { 470 DRM_ERROR("Failed to get downstream info: %d\n", err); 471 goto unlock; 472 } 473 474 anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc); 475 if (!anx6345->edid) 476 DRM_ERROR("Failed to read EDID from panel\n"); 477 478 err = drm_connector_update_edid_property(connector, 479 anx6345->edid); 480 if (err) { 481 DRM_ERROR("Failed to update EDID property: %d\n", err); 482 goto unlock; 483 } 484 } 485 486 num_modes += drm_add_edid_modes(connector, anx6345->edid); 487 488 unlock: 489 if (power_off) 490 anx6345_poweroff(anx6345); 491 492 mutex_unlock(&anx6345->lock); 493 494 if (!num_modes && anx6345->panel) 495 num_modes += drm_panel_get_modes(anx6345->panel, connector); 496 497 return num_modes; 498 } 499 500 static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = { 501 .get_modes = anx6345_get_modes, 502 }; 503 504 static void 505 anx6345_connector_destroy(struct drm_connector *connector) 506 { 507 struct anx6345 *anx6345 = connector_to_anx6345(connector); 508 509 if (anx6345->panel) 510 drm_panel_detach(anx6345->panel); 511 drm_connector_cleanup(connector); 512 } 513 514 static const struct drm_connector_funcs anx6345_connector_funcs = { 515 .fill_modes = drm_helper_probe_single_connector_modes, 516 .destroy = anx6345_connector_destroy, 517 .reset = drm_atomic_helper_connector_reset, 518 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 519 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 520 }; 521 522 static int anx6345_bridge_attach(struct drm_bridge *bridge) 523 { 524 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 525 int err; 526 527 if (!bridge->encoder) { 528 DRM_ERROR("Parent encoder object not found"); 529 return -ENODEV; 530 } 531 532 /* Register aux channel */ 533 anx6345->aux.name = "DP-AUX"; 534 anx6345->aux.dev = &anx6345->client->dev; 535 anx6345->aux.transfer = anx6345_aux_transfer; 536 537 err = drm_dp_aux_register(&anx6345->aux); 538 if (err < 0) { 539 DRM_ERROR("Failed to register aux channel: %d\n", err); 540 return err; 541 } 542 543 err = drm_connector_init(bridge->dev, &anx6345->connector, 544 &anx6345_connector_funcs, 545 DRM_MODE_CONNECTOR_eDP); 546 if (err) { 547 DRM_ERROR("Failed to initialize connector: %d\n", err); 548 return err; 549 } 550 551 drm_connector_helper_add(&anx6345->connector, 552 &anx6345_connector_helper_funcs); 553 554 err = drm_connector_register(&anx6345->connector); 555 if (err) { 556 DRM_ERROR("Failed to register connector: %d\n", err); 557 return err; 558 } 559 560 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD; 561 562 err = drm_connector_attach_encoder(&anx6345->connector, 563 bridge->encoder); 564 if (err) { 565 DRM_ERROR("Failed to link up connector to encoder: %d\n", err); 566 return err; 567 } 568 569 if (anx6345->panel) { 570 err = drm_panel_attach(anx6345->panel, &anx6345->connector); 571 if (err) { 572 DRM_ERROR("Failed to attach panel: %d\n", err); 573 return err; 574 } 575 } 576 577 return 0; 578 } 579 580 static enum drm_mode_status 581 anx6345_bridge_mode_valid(struct drm_bridge *bridge, 582 const struct drm_display_mode *mode) 583 { 584 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 585 return MODE_NO_INTERLACE; 586 587 /* Max 1200p at 5.4 Ghz, one lane */ 588 if (mode->clock > 154000) 589 return MODE_CLOCK_HIGH; 590 591 return MODE_OK; 592 } 593 594 static void anx6345_bridge_disable(struct drm_bridge *bridge) 595 { 596 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 597 598 /* Power off all modules except configuration registers access */ 599 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 600 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 601 if (anx6345->panel) 602 drm_panel_disable(anx6345->panel); 603 604 if (anx6345->powered) 605 anx6345_poweroff(anx6345); 606 } 607 608 static void anx6345_bridge_enable(struct drm_bridge *bridge) 609 { 610 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 611 int err; 612 613 if (anx6345->panel) 614 drm_panel_enable(anx6345->panel); 615 616 err = anx6345_start(anx6345); 617 if (err) { 618 DRM_ERROR("Failed to initialize: %d\n", err); 619 return; 620 } 621 622 err = anx6345_config_dp_output(anx6345); 623 if (err) 624 DRM_ERROR("Failed to enable DP output: %d\n", err); 625 } 626 627 static const struct drm_bridge_funcs anx6345_bridge_funcs = { 628 .attach = anx6345_bridge_attach, 629 .mode_valid = anx6345_bridge_mode_valid, 630 .disable = anx6345_bridge_disable, 631 .enable = anx6345_bridge_enable, 632 }; 633 634 static void unregister_i2c_dummy_clients(struct anx6345 *anx6345) 635 { 636 unsigned int i; 637 638 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++) 639 if (anx6345->i2c_clients[i] && 640 anx6345->i2c_clients[i]->addr != anx6345->client->addr) 641 i2c_unregister_device(anx6345->i2c_clients[i]); 642 } 643 644 static const struct regmap_config anx6345_regmap_config = { 645 .reg_bits = 8, 646 .val_bits = 8, 647 .max_register = 0xff, 648 .cache_type = REGCACHE_NONE, 649 }; 650 651 static const u16 anx6345_chipid_list[] = { 652 0x6345, 653 }; 654 655 static bool anx6345_get_chip_id(struct anx6345 *anx6345) 656 { 657 unsigned int i, idl, idh, version; 658 659 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl)) 660 return false; 661 662 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh)) 663 return false; 664 665 anx6345->chipid = (u8)idl | ((u8)idh << 8); 666 667 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG, 668 &version)) 669 return false; 670 671 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) { 672 if (anx6345->chipid == anx6345_chipid_list[i]) { 673 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n", 674 anx6345->chipid, version); 675 return true; 676 } 677 } 678 679 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n", 680 anx6345->chipid, version); 681 682 return false; 683 } 684 685 static int anx6345_i2c_probe(struct i2c_client *client, 686 const struct i2c_device_id *id) 687 { 688 struct anx6345 *anx6345; 689 struct device *dev; 690 int i, err; 691 692 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL); 693 if (!anx6345) 694 return -ENOMEM; 695 696 mutex_init(&anx6345->lock); 697 698 anx6345->bridge.of_node = client->dev.of_node; 699 700 anx6345->client = client; 701 i2c_set_clientdata(client, anx6345); 702 703 dev = &anx6345->client->dev; 704 705 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0, 706 &anx6345->panel, NULL); 707 if (err == -EPROBE_DEFER) 708 return err; 709 710 if (err) 711 DRM_DEBUG("No panel found\n"); 712 713 /* 1.2V digital core power regulator */ 714 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12-supply"); 715 if (IS_ERR(anx6345->dvdd12)) { 716 DRM_ERROR("dvdd12-supply not found\n"); 717 return PTR_ERR(anx6345->dvdd12); 718 } 719 720 /* 2.5V digital core power regulator */ 721 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25-supply"); 722 if (IS_ERR(anx6345->dvdd25)) { 723 DRM_ERROR("dvdd25-supply not found\n"); 724 return PTR_ERR(anx6345->dvdd25); 725 } 726 727 /* GPIO for chip reset */ 728 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); 729 if (IS_ERR(anx6345->gpiod_reset)) { 730 DRM_ERROR("Reset gpio not found\n"); 731 return PTR_ERR(anx6345->gpiod_reset); 732 } 733 734 /* Map slave addresses of ANX6345 */ 735 for (i = 0; i < I2C_NUM_ADDRESSES; i++) { 736 if (anx6345_i2c_addresses[i] >> 1 != client->addr) 737 anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter, 738 anx6345_i2c_addresses[i] >> 1); 739 else 740 anx6345->i2c_clients[i] = client; 741 742 if (IS_ERR(anx6345->i2c_clients[i])) { 743 err = PTR_ERR(anx6345->i2c_clients[i]); 744 DRM_ERROR("Failed to reserve I2C bus %02x\n", 745 anx6345_i2c_addresses[i]); 746 goto err_unregister_i2c; 747 } 748 749 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i], 750 &anx6345_regmap_config); 751 if (IS_ERR(anx6345->map[i])) { 752 err = PTR_ERR(anx6345->map[i]); 753 DRM_ERROR("Failed regmap initialization %02x\n", 754 anx6345_i2c_addresses[i]); 755 goto err_unregister_i2c; 756 } 757 } 758 759 /* Look for supported chip ID */ 760 anx6345_poweron(anx6345); 761 if (anx6345_get_chip_id(anx6345)) { 762 anx6345->bridge.funcs = &anx6345_bridge_funcs; 763 drm_bridge_add(&anx6345->bridge); 764 765 return 0; 766 } else { 767 anx6345_poweroff(anx6345); 768 err = -ENODEV; 769 } 770 771 err_unregister_i2c: 772 unregister_i2c_dummy_clients(anx6345); 773 return err; 774 } 775 776 static int anx6345_i2c_remove(struct i2c_client *client) 777 { 778 struct anx6345 *anx6345 = i2c_get_clientdata(client); 779 780 drm_bridge_remove(&anx6345->bridge); 781 782 unregister_i2c_dummy_clients(anx6345); 783 784 kfree(anx6345->edid); 785 786 mutex_destroy(&anx6345->lock); 787 788 return 0; 789 } 790 791 static const struct i2c_device_id anx6345_id[] = { 792 { "anx6345", 0 }, 793 { /* sentinel */ } 794 }; 795 MODULE_DEVICE_TABLE(i2c, anx6345_id); 796 797 static const struct of_device_id anx6345_match_table[] = { 798 { .compatible = "analogix,anx6345", }, 799 { /* sentinel */ }, 800 }; 801 MODULE_DEVICE_TABLE(of, anx6345_match_table); 802 803 static struct i2c_driver anx6345_driver = { 804 .driver = { 805 .name = "anx6345", 806 .of_match_table = of_match_ptr(anx6345_match_table), 807 }, 808 .probe = anx6345_i2c_probe, 809 .remove = anx6345_i2c_remove, 810 .id_table = anx6345_id, 811 }; 812 module_i2c_driver(anx6345_driver); 813 814 MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver"); 815 MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>"); 816 MODULE_LICENSE("GPL v2"); 817