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 /* Driver currently supports only 6bpc */ 489 connector->display_info.bpc = 6; 490 491 unlock: 492 if (power_off) 493 anx6345_poweroff(anx6345); 494 495 mutex_unlock(&anx6345->lock); 496 497 if (!num_modes && anx6345->panel) 498 num_modes += drm_panel_get_modes(anx6345->panel, connector); 499 500 return num_modes; 501 } 502 503 static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = { 504 .get_modes = anx6345_get_modes, 505 }; 506 507 static void 508 anx6345_connector_destroy(struct drm_connector *connector) 509 { 510 drm_connector_cleanup(connector); 511 } 512 513 static const struct drm_connector_funcs anx6345_connector_funcs = { 514 .fill_modes = drm_helper_probe_single_connector_modes, 515 .destroy = anx6345_connector_destroy, 516 .reset = drm_atomic_helper_connector_reset, 517 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 518 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 519 }; 520 521 static int anx6345_bridge_attach(struct drm_bridge *bridge, 522 enum drm_bridge_attach_flags flags) 523 { 524 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 525 int err; 526 527 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) { 528 DRM_ERROR("Fix bridge driver to make connector optional!"); 529 return -EINVAL; 530 } 531 532 if (!bridge->encoder) { 533 DRM_ERROR("Parent encoder object not found"); 534 return -ENODEV; 535 } 536 537 /* Register aux channel */ 538 anx6345->aux.name = "DP-AUX"; 539 anx6345->aux.dev = &anx6345->client->dev; 540 anx6345->aux.transfer = anx6345_aux_transfer; 541 542 err = drm_dp_aux_register(&anx6345->aux); 543 if (err < 0) { 544 DRM_ERROR("Failed to register aux channel: %d\n", err); 545 return err; 546 } 547 548 err = drm_connector_init(bridge->dev, &anx6345->connector, 549 &anx6345_connector_funcs, 550 DRM_MODE_CONNECTOR_eDP); 551 if (err) { 552 DRM_ERROR("Failed to initialize connector: %d\n", err); 553 return err; 554 } 555 556 drm_connector_helper_add(&anx6345->connector, 557 &anx6345_connector_helper_funcs); 558 559 err = drm_connector_register(&anx6345->connector); 560 if (err) { 561 DRM_ERROR("Failed to register connector: %d\n", err); 562 return err; 563 } 564 565 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD; 566 567 err = drm_connector_attach_encoder(&anx6345->connector, 568 bridge->encoder); 569 if (err) { 570 DRM_ERROR("Failed to link up connector to encoder: %d\n", err); 571 return err; 572 } 573 574 return 0; 575 } 576 577 static void anx6345_bridge_detach(struct drm_bridge *bridge) 578 { 579 drm_dp_aux_unregister(&bridge_to_anx6345(bridge)->aux); 580 } 581 582 static enum drm_mode_status 583 anx6345_bridge_mode_valid(struct drm_bridge *bridge, 584 const struct drm_display_info *info, 585 const struct drm_display_mode *mode) 586 { 587 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 588 return MODE_NO_INTERLACE; 589 590 /* Max 1200p at 5.4 Ghz, one lane */ 591 if (mode->clock > 154000) 592 return MODE_CLOCK_HIGH; 593 594 return MODE_OK; 595 } 596 597 static void anx6345_bridge_disable(struct drm_bridge *bridge) 598 { 599 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 600 601 /* Power off all modules except configuration registers access */ 602 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 603 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 604 if (anx6345->panel) 605 drm_panel_disable(anx6345->panel); 606 607 if (anx6345->powered) 608 anx6345_poweroff(anx6345); 609 } 610 611 static void anx6345_bridge_enable(struct drm_bridge *bridge) 612 { 613 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 614 int err; 615 616 if (anx6345->panel) 617 drm_panel_enable(anx6345->panel); 618 619 err = anx6345_start(anx6345); 620 if (err) { 621 DRM_ERROR("Failed to initialize: %d\n", err); 622 return; 623 } 624 625 err = anx6345_config_dp_output(anx6345); 626 if (err) 627 DRM_ERROR("Failed to enable DP output: %d\n", err); 628 } 629 630 static const struct drm_bridge_funcs anx6345_bridge_funcs = { 631 .attach = anx6345_bridge_attach, 632 .detach = anx6345_bridge_detach, 633 .mode_valid = anx6345_bridge_mode_valid, 634 .disable = anx6345_bridge_disable, 635 .enable = anx6345_bridge_enable, 636 }; 637 638 static void unregister_i2c_dummy_clients(struct anx6345 *anx6345) 639 { 640 unsigned int i; 641 642 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++) 643 if (anx6345->i2c_clients[i] && 644 anx6345->i2c_clients[i]->addr != anx6345->client->addr) 645 i2c_unregister_device(anx6345->i2c_clients[i]); 646 } 647 648 static const struct regmap_config anx6345_regmap_config = { 649 .reg_bits = 8, 650 .val_bits = 8, 651 .max_register = 0xff, 652 .cache_type = REGCACHE_NONE, 653 }; 654 655 static const u16 anx6345_chipid_list[] = { 656 0x6345, 657 }; 658 659 static bool anx6345_get_chip_id(struct anx6345 *anx6345) 660 { 661 unsigned int i, idl, idh, version; 662 663 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl)) 664 return false; 665 666 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh)) 667 return false; 668 669 anx6345->chipid = (u8)idl | ((u8)idh << 8); 670 671 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG, 672 &version)) 673 return false; 674 675 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) { 676 if (anx6345->chipid == anx6345_chipid_list[i]) { 677 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n", 678 anx6345->chipid, version); 679 return true; 680 } 681 } 682 683 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n", 684 anx6345->chipid, version); 685 686 return false; 687 } 688 689 static int anx6345_i2c_probe(struct i2c_client *client, 690 const struct i2c_device_id *id) 691 { 692 struct anx6345 *anx6345; 693 struct device *dev; 694 int i, err; 695 696 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL); 697 if (!anx6345) 698 return -ENOMEM; 699 700 mutex_init(&anx6345->lock); 701 702 anx6345->bridge.of_node = client->dev.of_node; 703 704 anx6345->client = client; 705 i2c_set_clientdata(client, anx6345); 706 707 dev = &anx6345->client->dev; 708 709 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0, 710 &anx6345->panel, NULL); 711 if (err == -EPROBE_DEFER) 712 return err; 713 714 if (err) 715 DRM_DEBUG("No panel found\n"); 716 717 /* 1.2V digital core power regulator */ 718 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12"); 719 if (IS_ERR(anx6345->dvdd12)) { 720 if (PTR_ERR(anx6345->dvdd12) != -EPROBE_DEFER) 721 DRM_ERROR("Failed to get dvdd12 supply (%ld)\n", 722 PTR_ERR(anx6345->dvdd12)); 723 return PTR_ERR(anx6345->dvdd12); 724 } 725 726 /* 2.5V digital core power regulator */ 727 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25"); 728 if (IS_ERR(anx6345->dvdd25)) { 729 if (PTR_ERR(anx6345->dvdd25) != -EPROBE_DEFER) 730 DRM_ERROR("Failed to get dvdd25 supply (%ld)\n", 731 PTR_ERR(anx6345->dvdd25)); 732 return PTR_ERR(anx6345->dvdd25); 733 } 734 735 /* GPIO for chip reset */ 736 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); 737 if (IS_ERR(anx6345->gpiod_reset)) { 738 DRM_ERROR("Reset gpio not found\n"); 739 return PTR_ERR(anx6345->gpiod_reset); 740 } 741 742 /* Map slave addresses of ANX6345 */ 743 for (i = 0; i < I2C_NUM_ADDRESSES; i++) { 744 if (anx6345_i2c_addresses[i] >> 1 != client->addr) 745 anx6345->i2c_clients[i] = i2c_new_dummy_device(client->adapter, 746 anx6345_i2c_addresses[i] >> 1); 747 else 748 anx6345->i2c_clients[i] = client; 749 750 if (IS_ERR(anx6345->i2c_clients[i])) { 751 err = PTR_ERR(anx6345->i2c_clients[i]); 752 DRM_ERROR("Failed to reserve I2C bus %02x\n", 753 anx6345_i2c_addresses[i]); 754 goto err_unregister_i2c; 755 } 756 757 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i], 758 &anx6345_regmap_config); 759 if (IS_ERR(anx6345->map[i])) { 760 err = PTR_ERR(anx6345->map[i]); 761 DRM_ERROR("Failed regmap initialization %02x\n", 762 anx6345_i2c_addresses[i]); 763 goto err_unregister_i2c; 764 } 765 } 766 767 /* Look for supported chip ID */ 768 anx6345_poweron(anx6345); 769 if (anx6345_get_chip_id(anx6345)) { 770 anx6345->bridge.funcs = &anx6345_bridge_funcs; 771 drm_bridge_add(&anx6345->bridge); 772 773 return 0; 774 } else { 775 anx6345_poweroff(anx6345); 776 err = -ENODEV; 777 } 778 779 err_unregister_i2c: 780 unregister_i2c_dummy_clients(anx6345); 781 return err; 782 } 783 784 static int anx6345_i2c_remove(struct i2c_client *client) 785 { 786 struct anx6345 *anx6345 = i2c_get_clientdata(client); 787 788 drm_bridge_remove(&anx6345->bridge); 789 790 unregister_i2c_dummy_clients(anx6345); 791 792 kfree(anx6345->edid); 793 794 mutex_destroy(&anx6345->lock); 795 796 return 0; 797 } 798 799 static const struct i2c_device_id anx6345_id[] = { 800 { "anx6345", 0 }, 801 { /* sentinel */ } 802 }; 803 MODULE_DEVICE_TABLE(i2c, anx6345_id); 804 805 static const struct of_device_id anx6345_match_table[] = { 806 { .compatible = "analogix,anx6345", }, 807 { /* sentinel */ }, 808 }; 809 MODULE_DEVICE_TABLE(of, anx6345_match_table); 810 811 static struct i2c_driver anx6345_driver = { 812 .driver = { 813 .name = "anx6345", 814 .of_match_table = of_match_ptr(anx6345_match_table), 815 }, 816 .probe = anx6345_i2c_probe, 817 .remove = anx6345_i2c_remove, 818 .id_table = anx6345_id, 819 }; 820 module_i2c_driver(anx6345_driver); 821 822 MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver"); 823 MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>"); 824 MODULE_LICENSE("GPL v2"); 825