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] = drm_dp_max_link_rate(anx6345->dpcd); 214 dpcd[0] = drm_dp_link_rate_to_bw_code(dpcd[0]); 215 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 216 SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]); 217 if (err) 218 return err; 219 220 dpcd[1] = drm_dp_max_lane_count(anx6345->dpcd); 221 222 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 223 SP_DP_LANE_COUNT_SET_REG, dpcd[1]); 224 if (err) 225 return err; 226 227 if (drm_dp_enhanced_frame_cap(anx6345->dpcd)) 228 dpcd[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 229 230 err = drm_dp_dpcd_write(&anx6345->aux, DP_LINK_BW_SET, dpcd, 231 sizeof(dpcd)); 232 233 if (err < 0) { 234 DRM_ERROR("Failed to configure link: %d\n", err); 235 return err; 236 } 237 238 /* Start training on the source */ 239 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG, 240 SP_LT_EN); 241 if (err) 242 return err; 243 244 return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX], 245 SP_DP_LT_CTRL_REG, 246 value, !(value & SP_DP_LT_INPROGRESS), 247 POLL_DELAY, POLL_TIMEOUT); 248 } 249 250 static int anx6345_tx_initialization(struct anx6345 *anx6345) 251 { 252 int err, i; 253 254 /* FIXME: colordepth is hardcoded for now */ 255 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG, 256 SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT); 257 if (err) 258 return err; 259 260 err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0); 261 if (err) 262 return err; 263 264 err = regmap_write(anx6345->map[I2C_IDX_TXCOM], 265 SP_ANALOG_DEBUG1_REG, 0); 266 if (err) 267 return err; 268 269 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 270 SP_DP_LINK_DEBUG_CTRL_REG, 271 SP_NEW_PRBS7 | SP_M_VID_DEBUG); 272 if (err) 273 return err; 274 275 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 276 SP_DP_ANALOG_POWER_DOWN_REG, 0); 277 if (err) 278 return err; 279 280 /* Force HPD */ 281 err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 282 SP_DP_SYSTEM_CTRL_BASE + 3, 283 SP_HPD_FORCE | SP_HPD_CTRL); 284 if (err) 285 return err; 286 287 for (i = 0; i < 4; i++) { 288 /* 4 lanes */ 289 err = regmap_write(anx6345->map[I2C_IDX_DPTX], 290 SP_DP_LANE0_LT_CTRL_REG + i, 0); 291 if (err) 292 return err; 293 } 294 295 /* Reset AUX */ 296 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], 297 SP_RESET_CTRL2_REG, SP_AUX_RST); 298 if (err) 299 return err; 300 301 return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 302 SP_RESET_CTRL2_REG, SP_AUX_RST); 303 } 304 305 static void anx6345_poweron(struct anx6345 *anx6345) 306 { 307 int err; 308 309 /* Ensure reset is asserted before starting power on sequence */ 310 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); 311 usleep_range(1000, 2000); 312 313 err = regulator_enable(anx6345->dvdd12); 314 if (err) { 315 DRM_ERROR("Failed to enable dvdd12 regulator: %d\n", 316 err); 317 return; 318 } 319 320 /* T1 - delay between VDD12 and VDD25 should be 0-2ms */ 321 usleep_range(1000, 2000); 322 323 err = regulator_enable(anx6345->dvdd25); 324 if (err) { 325 DRM_ERROR("Failed to enable dvdd25 regulator: %d\n", 326 err); 327 return; 328 } 329 330 /* T2 - delay between RESETN and all power rail stable, 331 * should be 2-5ms 332 */ 333 usleep_range(2000, 5000); 334 335 gpiod_set_value_cansleep(anx6345->gpiod_reset, 0); 336 337 /* Power on registers module */ 338 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 339 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 340 anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 341 SP_REGISTER_PD | SP_TOTAL_PD); 342 343 if (anx6345->panel) 344 drm_panel_prepare(anx6345->panel); 345 346 anx6345->powered = true; 347 } 348 349 static void anx6345_poweroff(struct anx6345 *anx6345) 350 { 351 int err; 352 353 gpiod_set_value_cansleep(anx6345->gpiod_reset, 1); 354 usleep_range(1000, 2000); 355 356 if (anx6345->panel) 357 drm_panel_unprepare(anx6345->panel); 358 359 err = regulator_disable(anx6345->dvdd25); 360 if (err) { 361 DRM_ERROR("Failed to disable dvdd25 regulator: %d\n", 362 err); 363 return; 364 } 365 366 usleep_range(5000, 10000); 367 368 err = regulator_disable(anx6345->dvdd12); 369 if (err) { 370 DRM_ERROR("Failed to disable dvdd12 regulator: %d\n", 371 err); 372 return; 373 } 374 375 usleep_range(1000, 2000); 376 377 anx6345->powered = false; 378 } 379 380 static int anx6345_start(struct anx6345 *anx6345) 381 { 382 int err; 383 384 if (!anx6345->powered) 385 anx6345_poweron(anx6345); 386 387 /* Power on needed modules */ 388 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], 389 SP_POWERDOWN_CTRL_REG, 390 SP_VIDEO_PD | SP_LINK_PD); 391 392 err = anx6345_tx_initialization(anx6345); 393 if (err) { 394 DRM_ERROR("Failed eDP transmitter initialization: %d\n", err); 395 anx6345_poweroff(anx6345); 396 return err; 397 } 398 399 err = anx6345_dp_link_training(anx6345); 400 if (err) { 401 DRM_ERROR("Failed link training: %d\n", err); 402 anx6345_poweroff(anx6345); 403 return err; 404 } 405 406 /* 407 * This delay seems to help keep the hardware in a good state. Without 408 * it, there are times where it fails silently. 409 */ 410 usleep_range(10000, 15000); 411 412 return 0; 413 } 414 415 static int anx6345_config_dp_output(struct anx6345 *anx6345) 416 { 417 int err; 418 419 err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 420 SP_VIDEO_MUTE); 421 if (err) 422 return err; 423 424 /* Enable DP output */ 425 err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG, 426 SP_VIDEO_EN); 427 if (err) 428 return err; 429 430 /* Force stream valid */ 431 return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX], 432 SP_DP_SYSTEM_CTRL_BASE + 3, 433 SP_STRM_FORCE | SP_STRM_CTRL); 434 } 435 436 static int anx6345_get_downstream_info(struct anx6345 *anx6345) 437 { 438 u8 value; 439 int err; 440 441 err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value); 442 if (err < 0) { 443 DRM_ERROR("Get sink count failed %d\n", err); 444 return err; 445 } 446 447 if (!DP_GET_SINK_COUNT(value)) { 448 DRM_ERROR("Downstream disconnected\n"); 449 return -EIO; 450 } 451 452 return 0; 453 } 454 455 static int anx6345_get_modes(struct drm_connector *connector) 456 { 457 struct anx6345 *anx6345 = connector_to_anx6345(connector); 458 int err, num_modes = 0; 459 bool power_off = false; 460 461 mutex_lock(&anx6345->lock); 462 463 if (!anx6345->edid) { 464 if (!anx6345->powered) { 465 anx6345_poweron(anx6345); 466 power_off = true; 467 } 468 469 err = anx6345_get_downstream_info(anx6345); 470 if (err) { 471 DRM_ERROR("Failed to get downstream info: %d\n", err); 472 goto unlock; 473 } 474 475 anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc); 476 if (!anx6345->edid) 477 DRM_ERROR("Failed to read EDID from panel\n"); 478 479 err = drm_connector_update_edid_property(connector, 480 anx6345->edid); 481 if (err) { 482 DRM_ERROR("Failed to update EDID property: %d\n", err); 483 goto unlock; 484 } 485 } 486 487 num_modes += drm_add_edid_modes(connector, anx6345->edid); 488 489 unlock: 490 if (power_off) 491 anx6345_poweroff(anx6345); 492 493 mutex_unlock(&anx6345->lock); 494 495 if (!num_modes && anx6345->panel) 496 num_modes += drm_panel_get_modes(anx6345->panel); 497 498 return num_modes; 499 } 500 501 static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs = { 502 .get_modes = anx6345_get_modes, 503 }; 504 505 static void 506 anx6345_connector_destroy(struct drm_connector *connector) 507 { 508 struct anx6345 *anx6345 = connector_to_anx6345(connector); 509 510 if (anx6345->panel) 511 drm_panel_detach(anx6345->panel); 512 drm_connector_cleanup(connector); 513 } 514 515 static const struct drm_connector_funcs anx6345_connector_funcs = { 516 .fill_modes = drm_helper_probe_single_connector_modes, 517 .destroy = anx6345_connector_destroy, 518 .reset = drm_atomic_helper_connector_reset, 519 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 520 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 521 }; 522 523 static int anx6345_bridge_attach(struct drm_bridge *bridge) 524 { 525 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 526 int err; 527 528 if (!bridge->encoder) { 529 DRM_ERROR("Parent encoder object not found"); 530 return -ENODEV; 531 } 532 533 /* Register aux channel */ 534 anx6345->aux.name = "DP-AUX"; 535 anx6345->aux.dev = &anx6345->client->dev; 536 anx6345->aux.transfer = anx6345_aux_transfer; 537 538 err = drm_dp_aux_register(&anx6345->aux); 539 if (err < 0) { 540 DRM_ERROR("Failed to register aux channel: %d\n", err); 541 return err; 542 } 543 544 err = drm_connector_init(bridge->dev, &anx6345->connector, 545 &anx6345_connector_funcs, 546 DRM_MODE_CONNECTOR_eDP); 547 if (err) { 548 DRM_ERROR("Failed to initialize connector: %d\n", err); 549 return err; 550 } 551 552 drm_connector_helper_add(&anx6345->connector, 553 &anx6345_connector_helper_funcs); 554 555 err = drm_connector_register(&anx6345->connector); 556 if (err) { 557 DRM_ERROR("Failed to register connector: %d\n", err); 558 return err; 559 } 560 561 anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD; 562 563 err = drm_connector_attach_encoder(&anx6345->connector, 564 bridge->encoder); 565 if (err) { 566 DRM_ERROR("Failed to link up connector to encoder: %d\n", err); 567 return err; 568 } 569 570 if (anx6345->panel) { 571 err = drm_panel_attach(anx6345->panel, &anx6345->connector); 572 if (err) { 573 DRM_ERROR("Failed to attach panel: %d\n", err); 574 return err; 575 } 576 } 577 578 return 0; 579 } 580 581 static enum drm_mode_status 582 anx6345_bridge_mode_valid(struct drm_bridge *bridge, 583 const struct drm_display_mode *mode) 584 { 585 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 586 return MODE_NO_INTERLACE; 587 588 /* Max 1200p at 5.4 Ghz, one lane */ 589 if (mode->clock > 154000) 590 return MODE_CLOCK_HIGH; 591 592 return MODE_OK; 593 } 594 595 static void anx6345_bridge_disable(struct drm_bridge *bridge) 596 { 597 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 598 599 /* Power off all modules except configuration registers access */ 600 anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG, 601 SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD); 602 if (anx6345->panel) 603 drm_panel_disable(anx6345->panel); 604 605 if (anx6345->powered) 606 anx6345_poweroff(anx6345); 607 } 608 609 static void anx6345_bridge_enable(struct drm_bridge *bridge) 610 { 611 struct anx6345 *anx6345 = bridge_to_anx6345(bridge); 612 int err; 613 614 if (anx6345->panel) 615 drm_panel_enable(anx6345->panel); 616 617 err = anx6345_start(anx6345); 618 if (err) { 619 DRM_ERROR("Failed to initialize: %d\n", err); 620 return; 621 } 622 623 err = anx6345_config_dp_output(anx6345); 624 if (err) 625 DRM_ERROR("Failed to enable DP output: %d\n", err); 626 } 627 628 static const struct drm_bridge_funcs anx6345_bridge_funcs = { 629 .attach = anx6345_bridge_attach, 630 .mode_valid = anx6345_bridge_mode_valid, 631 .disable = anx6345_bridge_disable, 632 .enable = anx6345_bridge_enable, 633 }; 634 635 static void unregister_i2c_dummy_clients(struct anx6345 *anx6345) 636 { 637 unsigned int i; 638 639 for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++) 640 if (anx6345->i2c_clients[i] && 641 anx6345->i2c_clients[i]->addr != anx6345->client->addr) 642 i2c_unregister_device(anx6345->i2c_clients[i]); 643 } 644 645 static const struct regmap_config anx6345_regmap_config = { 646 .reg_bits = 8, 647 .val_bits = 8, 648 .max_register = 0xff, 649 .cache_type = REGCACHE_NONE, 650 }; 651 652 static const u16 anx6345_chipid_list[] = { 653 0x6345, 654 }; 655 656 static bool anx6345_get_chip_id(struct anx6345 *anx6345) 657 { 658 unsigned int i, idl, idh, version; 659 660 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl)) 661 return false; 662 663 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh)) 664 return false; 665 666 anx6345->chipid = (u8)idl | ((u8)idh << 8); 667 668 if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG, 669 &version)) 670 return false; 671 672 for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) { 673 if (anx6345->chipid == anx6345_chipid_list[i]) { 674 DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n", 675 anx6345->chipid, version); 676 return true; 677 } 678 } 679 680 DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n", 681 anx6345->chipid, version); 682 683 return false; 684 } 685 686 static int anx6345_i2c_probe(struct i2c_client *client, 687 const struct i2c_device_id *id) 688 { 689 struct anx6345 *anx6345; 690 struct device *dev; 691 int i, err; 692 693 anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL); 694 if (!anx6345) 695 return -ENOMEM; 696 697 mutex_init(&anx6345->lock); 698 699 anx6345->bridge.of_node = client->dev.of_node; 700 701 anx6345->client = client; 702 i2c_set_clientdata(client, anx6345); 703 704 dev = &anx6345->client->dev; 705 706 err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0, 707 &anx6345->panel, NULL); 708 if (err == -EPROBE_DEFER) 709 return err; 710 711 if (err) 712 DRM_DEBUG("No panel found\n"); 713 714 /* 1.2V digital core power regulator */ 715 anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12-supply"); 716 if (IS_ERR(anx6345->dvdd12)) { 717 DRM_ERROR("dvdd12-supply not found\n"); 718 return PTR_ERR(anx6345->dvdd12); 719 } 720 721 /* 2.5V digital core power regulator */ 722 anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25-supply"); 723 if (IS_ERR(anx6345->dvdd25)) { 724 DRM_ERROR("dvdd25-supply not found\n"); 725 return PTR_ERR(anx6345->dvdd25); 726 } 727 728 /* GPIO for chip reset */ 729 anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); 730 if (IS_ERR(anx6345->gpiod_reset)) { 731 DRM_ERROR("Reset gpio not found\n"); 732 return PTR_ERR(anx6345->gpiod_reset); 733 } 734 735 /* Map slave addresses of ANX6345 */ 736 for (i = 0; i < I2C_NUM_ADDRESSES; i++) { 737 if (anx6345_i2c_addresses[i] >> 1 != client->addr) 738 anx6345->i2c_clients[i] = i2c_new_dummy(client->adapter, 739 anx6345_i2c_addresses[i] >> 1); 740 else 741 anx6345->i2c_clients[i] = client; 742 743 if (!anx6345->i2c_clients[i]) { 744 err = -ENOMEM; 745 DRM_ERROR("Failed to reserve I2C bus %02x\n", 746 anx6345_i2c_addresses[i]); 747 goto err_unregister_i2c; 748 } 749 750 anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i], 751 &anx6345_regmap_config); 752 if (IS_ERR(anx6345->map[i])) { 753 err = PTR_ERR(anx6345->map[i]); 754 DRM_ERROR("Failed regmap initialization %02x\n", 755 anx6345_i2c_addresses[i]); 756 goto err_unregister_i2c; 757 } 758 } 759 760 /* Look for supported chip ID */ 761 anx6345_poweron(anx6345); 762 if (anx6345_get_chip_id(anx6345)) { 763 anx6345->bridge.funcs = &anx6345_bridge_funcs; 764 drm_bridge_add(&anx6345->bridge); 765 766 return 0; 767 } else { 768 anx6345_poweroff(anx6345); 769 err = -ENODEV; 770 } 771 772 err_unregister_i2c: 773 unregister_i2c_dummy_clients(anx6345); 774 return err; 775 } 776 777 static int anx6345_i2c_remove(struct i2c_client *client) 778 { 779 struct anx6345 *anx6345 = i2c_get_clientdata(client); 780 781 drm_bridge_remove(&anx6345->bridge); 782 783 unregister_i2c_dummy_clients(anx6345); 784 785 kfree(anx6345->edid); 786 787 mutex_destroy(&anx6345->lock); 788 789 return 0; 790 } 791 792 static const struct i2c_device_id anx6345_id[] = { 793 { "anx6345", 0 }, 794 { /* sentinel */ } 795 }; 796 MODULE_DEVICE_TABLE(i2c, anx6345_id); 797 798 static const struct of_device_id anx6345_match_table[] = { 799 { .compatible = "analogix,anx6345", }, 800 { /* sentinel */ }, 801 }; 802 MODULE_DEVICE_TABLE(of, anx6345_match_table); 803 804 static struct i2c_driver anx6345_driver = { 805 .driver = { 806 .name = "anx6345", 807 .of_match_table = of_match_ptr(anx6345_match_table), 808 }, 809 .probe = anx6345_i2c_probe, 810 .remove = anx6345_i2c_remove, 811 .id_table = anx6345_id, 812 }; 813 module_i2c_driver(anx6345_driver); 814 815 MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver"); 816 MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>"); 817 MODULE_LICENSE("GPL v2"); 818