1 /* 2 * MIPI DSI Bus 3 * 4 * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd. 5 * Andrzej Hajda <a.hajda@samsung.com> 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the 9 * "Software"), to deal in the Software without restriction, including 10 * without limitation the rights to use, copy, modify, merge, publish, 11 * distribute, sub license, and/or sell copies of the Software, and to 12 * permit persons to whom the Software is furnished to do so, subject to 13 * the following conditions: 14 * 15 * The above copyright notice and this permission notice (including the 16 * next paragraph) shall be included in all copies or substantial portions 17 * of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 25 * USE OR OTHER DEALINGS IN THE SOFTWARE. 26 */ 27 28 #include <linux/device.h> 29 #include <linux/module.h> 30 #include <linux/of.h> 31 #include <linux/of_device.h> 32 #include <linux/pm_runtime.h> 33 #include <linux/slab.h> 34 35 #include <drm/display/drm_dsc.h> 36 #include <drm/drm_mipi_dsi.h> 37 #include <drm/drm_print.h> 38 39 #include <linux/media-bus-format.h> 40 41 #include <video/mipi_display.h> 42 43 /** 44 * DOC: dsi helpers 45 * 46 * These functions contain some common logic and helpers to deal with MIPI DSI 47 * peripherals. 48 * 49 * Helpers are provided for a number of standard MIPI DSI command as well as a 50 * subset of the MIPI DCS command set. 51 */ 52 53 static int mipi_dsi_device_match(struct device *dev, const struct device_driver *drv) 54 { 55 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); 56 57 /* attempt OF style match */ 58 if (of_driver_match_device(dev, drv)) 59 return 1; 60 61 /* compare DSI device and driver names */ 62 if (!strcmp(dsi->name, drv->name)) 63 return 1; 64 65 return 0; 66 } 67 68 static int mipi_dsi_uevent(const struct device *dev, struct kobj_uevent_env *env) 69 { 70 const struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); 71 int err; 72 73 err = of_device_uevent_modalias(dev, env); 74 if (err != -ENODEV) 75 return err; 76 77 add_uevent_var(env, "MODALIAS=%s%s", MIPI_DSI_MODULE_PREFIX, 78 dsi->name); 79 80 return 0; 81 } 82 83 static const struct dev_pm_ops mipi_dsi_device_pm_ops = { 84 .runtime_suspend = pm_generic_runtime_suspend, 85 .runtime_resume = pm_generic_runtime_resume, 86 .suspend = pm_generic_suspend, 87 .resume = pm_generic_resume, 88 .freeze = pm_generic_freeze, 89 .thaw = pm_generic_thaw, 90 .poweroff = pm_generic_poweroff, 91 .restore = pm_generic_restore, 92 }; 93 94 const struct bus_type mipi_dsi_bus_type = { 95 .name = "mipi-dsi", 96 .match = mipi_dsi_device_match, 97 .uevent = mipi_dsi_uevent, 98 .pm = &mipi_dsi_device_pm_ops, 99 }; 100 EXPORT_SYMBOL_GPL(mipi_dsi_bus_type); 101 102 /** 103 * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a 104 * device tree node 105 * @np: device tree node 106 * 107 * Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no 108 * such device exists (or has not been registered yet). 109 */ 110 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np) 111 { 112 struct device *dev; 113 114 dev = bus_find_device_by_of_node(&mipi_dsi_bus_type, np); 115 116 return dev ? to_mipi_dsi_device(dev) : NULL; 117 } 118 EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node); 119 120 static void mipi_dsi_dev_release(struct device *dev) 121 { 122 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); 123 124 of_node_put(dev->of_node); 125 kfree(dsi); 126 } 127 128 static const struct device_type mipi_dsi_device_type = { 129 .release = mipi_dsi_dev_release, 130 }; 131 132 static struct mipi_dsi_device *mipi_dsi_device_alloc(struct mipi_dsi_host *host) 133 { 134 struct mipi_dsi_device *dsi; 135 136 dsi = kzalloc(sizeof(*dsi), GFP_KERNEL); 137 if (!dsi) 138 return ERR_PTR(-ENOMEM); 139 140 dsi->host = host; 141 dsi->dev.bus = &mipi_dsi_bus_type; 142 dsi->dev.parent = host->dev; 143 dsi->dev.type = &mipi_dsi_device_type; 144 145 device_initialize(&dsi->dev); 146 147 return dsi; 148 } 149 150 static int mipi_dsi_device_add(struct mipi_dsi_device *dsi) 151 { 152 struct mipi_dsi_host *host = dsi->host; 153 154 dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev), dsi->channel); 155 156 return device_add(&dsi->dev); 157 } 158 159 #if IS_ENABLED(CONFIG_OF) 160 static struct mipi_dsi_device * 161 of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node) 162 { 163 struct mipi_dsi_device_info info = { }; 164 int ret; 165 u32 reg; 166 167 if (of_alias_from_compatible(node, info.type, sizeof(info.type)) < 0) { 168 dev_err(host->dev, "modalias failure on %pOF\n", node); 169 return ERR_PTR(-EINVAL); 170 } 171 172 ret = of_property_read_u32(node, "reg", ®); 173 if (ret) { 174 dev_err(host->dev, "device node %pOF has no valid reg property: %d\n", 175 node, ret); 176 return ERR_PTR(-EINVAL); 177 } 178 179 info.channel = reg; 180 info.node = of_node_get(node); 181 182 return mipi_dsi_device_register_full(host, &info); 183 } 184 #else 185 static struct mipi_dsi_device * 186 of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node) 187 { 188 return ERR_PTR(-ENODEV); 189 } 190 #endif 191 192 /** 193 * mipi_dsi_device_register_full - create a MIPI DSI device 194 * @host: DSI host to which this device is connected 195 * @info: pointer to template containing DSI device information 196 * 197 * Create a MIPI DSI device by using the device information provided by 198 * mipi_dsi_device_info template 199 * 200 * Returns: 201 * A pointer to the newly created MIPI DSI device, or, a pointer encoded 202 * with an error 203 */ 204 struct mipi_dsi_device * 205 mipi_dsi_device_register_full(struct mipi_dsi_host *host, 206 const struct mipi_dsi_device_info *info) 207 { 208 struct mipi_dsi_device *dsi; 209 int ret; 210 211 if (!info) { 212 dev_err(host->dev, "invalid mipi_dsi_device_info pointer\n"); 213 return ERR_PTR(-EINVAL); 214 } 215 216 if (info->channel > 3) { 217 dev_err(host->dev, "invalid virtual channel: %u\n", info->channel); 218 return ERR_PTR(-EINVAL); 219 } 220 221 dsi = mipi_dsi_device_alloc(host); 222 if (IS_ERR(dsi)) { 223 dev_err(host->dev, "failed to allocate DSI device %ld\n", 224 PTR_ERR(dsi)); 225 return dsi; 226 } 227 228 device_set_node(&dsi->dev, of_fwnode_handle(info->node)); 229 dsi->channel = info->channel; 230 strscpy(dsi->name, info->type, sizeof(dsi->name)); 231 232 ret = mipi_dsi_device_add(dsi); 233 if (ret) { 234 dev_err(host->dev, "failed to add DSI device %d\n", ret); 235 kfree(dsi); 236 return ERR_PTR(ret); 237 } 238 239 return dsi; 240 } 241 EXPORT_SYMBOL(mipi_dsi_device_register_full); 242 243 /** 244 * mipi_dsi_device_unregister - unregister MIPI DSI device 245 * @dsi: DSI peripheral device 246 */ 247 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi) 248 { 249 device_unregister(&dsi->dev); 250 } 251 EXPORT_SYMBOL(mipi_dsi_device_unregister); 252 253 static void devm_mipi_dsi_device_unregister(void *arg) 254 { 255 struct mipi_dsi_device *dsi = arg; 256 257 mipi_dsi_device_unregister(dsi); 258 } 259 260 /** 261 * devm_mipi_dsi_device_register_full - create a managed MIPI DSI device 262 * @dev: device to tie the MIPI-DSI device lifetime to 263 * @host: DSI host to which this device is connected 264 * @info: pointer to template containing DSI device information 265 * 266 * Create a MIPI DSI device by using the device information provided by 267 * mipi_dsi_device_info template 268 * 269 * This is the managed version of mipi_dsi_device_register_full() which 270 * automatically calls mipi_dsi_device_unregister() when @dev is 271 * unbound. 272 * 273 * Returns: 274 * A pointer to the newly created MIPI DSI device, or, a pointer encoded 275 * with an error 276 */ 277 struct mipi_dsi_device * 278 devm_mipi_dsi_device_register_full(struct device *dev, 279 struct mipi_dsi_host *host, 280 const struct mipi_dsi_device_info *info) 281 { 282 struct mipi_dsi_device *dsi; 283 int ret; 284 285 dsi = mipi_dsi_device_register_full(host, info); 286 if (IS_ERR(dsi)) 287 return dsi; 288 289 ret = devm_add_action_or_reset(dev, 290 devm_mipi_dsi_device_unregister, 291 dsi); 292 if (ret) 293 return ERR_PTR(ret); 294 295 return dsi; 296 } 297 EXPORT_SYMBOL_GPL(devm_mipi_dsi_device_register_full); 298 299 static DEFINE_MUTEX(host_lock); 300 static LIST_HEAD(host_list); 301 302 /** 303 * of_find_mipi_dsi_host_by_node() - find the MIPI DSI host matching a 304 * device tree node 305 * @node: device tree node 306 * 307 * Returns: 308 * A pointer to the MIPI DSI host corresponding to @node or NULL if no 309 * such device exists (or has not been registered yet). 310 */ 311 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node) 312 { 313 struct mipi_dsi_host *host; 314 315 mutex_lock(&host_lock); 316 317 list_for_each_entry(host, &host_list, list) { 318 if (host->dev->of_node == node) { 319 mutex_unlock(&host_lock); 320 return host; 321 } 322 } 323 324 mutex_unlock(&host_lock); 325 326 return NULL; 327 } 328 EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node); 329 330 int mipi_dsi_host_register(struct mipi_dsi_host *host) 331 { 332 struct device_node *node; 333 334 for_each_available_child_of_node(host->dev->of_node, node) { 335 /* skip nodes without reg property */ 336 if (!of_property_present(node, "reg")) 337 continue; 338 of_mipi_dsi_device_add(host, node); 339 } 340 341 mutex_lock(&host_lock); 342 list_add_tail(&host->list, &host_list); 343 mutex_unlock(&host_lock); 344 345 return 0; 346 } 347 EXPORT_SYMBOL(mipi_dsi_host_register); 348 349 static int mipi_dsi_remove_device_fn(struct device *dev, void *priv) 350 { 351 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); 352 353 if (dsi->attached) 354 mipi_dsi_detach(dsi); 355 mipi_dsi_device_unregister(dsi); 356 357 return 0; 358 } 359 360 void mipi_dsi_host_unregister(struct mipi_dsi_host *host) 361 { 362 device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn); 363 364 mutex_lock(&host_lock); 365 list_del_init(&host->list); 366 mutex_unlock(&host_lock); 367 } 368 EXPORT_SYMBOL(mipi_dsi_host_unregister); 369 370 /** 371 * mipi_dsi_attach - attach a DSI device to its DSI host 372 * @dsi: DSI peripheral 373 */ 374 int mipi_dsi_attach(struct mipi_dsi_device *dsi) 375 { 376 const struct mipi_dsi_host_ops *ops = dsi->host->ops; 377 int ret; 378 379 if (!ops || !ops->attach) 380 return -ENOSYS; 381 382 ret = ops->attach(dsi->host, dsi); 383 if (ret) 384 return ret; 385 386 dsi->attached = true; 387 388 return 0; 389 } 390 EXPORT_SYMBOL(mipi_dsi_attach); 391 392 /** 393 * mipi_dsi_detach - detach a DSI device from its DSI host 394 * @dsi: DSI peripheral 395 */ 396 int mipi_dsi_detach(struct mipi_dsi_device *dsi) 397 { 398 const struct mipi_dsi_host_ops *ops = dsi->host->ops; 399 400 if (WARN_ON(!dsi->attached)) 401 return -EINVAL; 402 403 if (!ops || !ops->detach) 404 return -ENOSYS; 405 406 dsi->attached = false; 407 408 return ops->detach(dsi->host, dsi); 409 } 410 EXPORT_SYMBOL(mipi_dsi_detach); 411 412 static void devm_mipi_dsi_detach(void *arg) 413 { 414 struct mipi_dsi_device *dsi = arg; 415 416 mipi_dsi_detach(dsi); 417 } 418 419 /** 420 * devm_mipi_dsi_attach - Attach a MIPI-DSI device to its DSI Host 421 * @dev: device to tie the MIPI-DSI device attachment lifetime to 422 * @dsi: DSI peripheral 423 * 424 * This is the managed version of mipi_dsi_attach() which automatically 425 * calls mipi_dsi_detach() when @dev is unbound. 426 * 427 * Returns: 428 * 0 on success, a negative error code on failure. 429 */ 430 int devm_mipi_dsi_attach(struct device *dev, 431 struct mipi_dsi_device *dsi) 432 { 433 int ret; 434 435 ret = mipi_dsi_attach(dsi); 436 if (ret) 437 return ret; 438 439 ret = devm_add_action_or_reset(dev, devm_mipi_dsi_detach, dsi); 440 if (ret) 441 return ret; 442 443 return 0; 444 } 445 EXPORT_SYMBOL_GPL(devm_mipi_dsi_attach); 446 447 static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi, 448 struct mipi_dsi_msg *msg) 449 { 450 const struct mipi_dsi_host_ops *ops = dsi->host->ops; 451 452 if (!ops || !ops->transfer) 453 return -ENOSYS; 454 455 if (dsi->mode_flags & MIPI_DSI_MODE_LPM) 456 msg->flags |= MIPI_DSI_MSG_USE_LPM; 457 458 return ops->transfer(dsi->host, msg); 459 } 460 461 /** 462 * mipi_dsi_packet_format_is_short - check if a packet is of the short format 463 * @type: MIPI DSI data type of the packet 464 * 465 * Return: true if the packet for the given data type is a short packet, false 466 * otherwise. 467 */ 468 bool mipi_dsi_packet_format_is_short(u8 type) 469 { 470 switch (type) { 471 case MIPI_DSI_V_SYNC_START: 472 case MIPI_DSI_V_SYNC_END: 473 case MIPI_DSI_H_SYNC_START: 474 case MIPI_DSI_H_SYNC_END: 475 case MIPI_DSI_COMPRESSION_MODE: 476 case MIPI_DSI_END_OF_TRANSMISSION: 477 case MIPI_DSI_COLOR_MODE_OFF: 478 case MIPI_DSI_COLOR_MODE_ON: 479 case MIPI_DSI_SHUTDOWN_PERIPHERAL: 480 case MIPI_DSI_TURN_ON_PERIPHERAL: 481 case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM: 482 case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM: 483 case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM: 484 case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM: 485 case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM: 486 case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM: 487 case MIPI_DSI_DCS_SHORT_WRITE: 488 case MIPI_DSI_DCS_SHORT_WRITE_PARAM: 489 case MIPI_DSI_DCS_READ: 490 case MIPI_DSI_EXECUTE_QUEUE: 491 case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE: 492 return true; 493 } 494 495 return false; 496 } 497 EXPORT_SYMBOL(mipi_dsi_packet_format_is_short); 498 499 /** 500 * mipi_dsi_packet_format_is_long - check if a packet is of the long format 501 * @type: MIPI DSI data type of the packet 502 * 503 * Return: true if the packet for the given data type is a long packet, false 504 * otherwise. 505 */ 506 bool mipi_dsi_packet_format_is_long(u8 type) 507 { 508 switch (type) { 509 case MIPI_DSI_NULL_PACKET: 510 case MIPI_DSI_BLANKING_PACKET: 511 case MIPI_DSI_GENERIC_LONG_WRITE: 512 case MIPI_DSI_DCS_LONG_WRITE: 513 case MIPI_DSI_PICTURE_PARAMETER_SET: 514 case MIPI_DSI_COMPRESSED_PIXEL_STREAM: 515 case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20: 516 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24: 517 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16: 518 case MIPI_DSI_PACKED_PIXEL_STREAM_30: 519 case MIPI_DSI_PACKED_PIXEL_STREAM_36: 520 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12: 521 case MIPI_DSI_PACKED_PIXEL_STREAM_16: 522 case MIPI_DSI_PACKED_PIXEL_STREAM_18: 523 case MIPI_DSI_PIXEL_STREAM_3BYTE_18: 524 case MIPI_DSI_PACKED_PIXEL_STREAM_24: 525 return true; 526 } 527 528 return false; 529 } 530 EXPORT_SYMBOL(mipi_dsi_packet_format_is_long); 531 532 /** 533 * mipi_dsi_create_packet - create a packet from a message according to the 534 * DSI protocol 535 * @packet: pointer to a DSI packet structure 536 * @msg: message to translate into a packet 537 * 538 * Return: 0 on success or a negative error code on failure. 539 */ 540 int mipi_dsi_create_packet(struct mipi_dsi_packet *packet, 541 const struct mipi_dsi_msg *msg) 542 { 543 if (!packet || !msg) 544 return -EINVAL; 545 546 /* do some minimum sanity checking */ 547 if (!mipi_dsi_packet_format_is_short(msg->type) && 548 !mipi_dsi_packet_format_is_long(msg->type)) 549 return -EINVAL; 550 551 if (msg->channel > 3) 552 return -EINVAL; 553 554 memset(packet, 0, sizeof(*packet)); 555 packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f); 556 557 /* TODO: compute ECC if hardware support is not available */ 558 559 /* 560 * Long write packets contain the word count in header bytes 1 and 2. 561 * The payload follows the header and is word count bytes long. 562 * 563 * Short write packets encode up to two parameters in header bytes 1 564 * and 2. 565 */ 566 if (mipi_dsi_packet_format_is_long(msg->type)) { 567 packet->header[1] = (msg->tx_len >> 0) & 0xff; 568 packet->header[2] = (msg->tx_len >> 8) & 0xff; 569 570 packet->payload_length = msg->tx_len; 571 packet->payload = msg->tx_buf; 572 } else { 573 const u8 *tx = msg->tx_buf; 574 575 packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0; 576 packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0; 577 } 578 579 packet->size = sizeof(packet->header) + packet->payload_length; 580 581 return 0; 582 } 583 EXPORT_SYMBOL(mipi_dsi_create_packet); 584 585 /** 586 * mipi_dsi_shutdown_peripheral() - sends a Shutdown Peripheral command 587 * @dsi: DSI peripheral device 588 * 589 * Return: 0 on success or a negative error code on failure. 590 */ 591 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi) 592 { 593 struct mipi_dsi_msg msg = { 594 .channel = dsi->channel, 595 .type = MIPI_DSI_SHUTDOWN_PERIPHERAL, 596 .tx_buf = (u8 [2]) { 0, 0 }, 597 .tx_len = 2, 598 }; 599 int ret = mipi_dsi_device_transfer(dsi, &msg); 600 601 return (ret < 0) ? ret : 0; 602 } 603 EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral); 604 605 /** 606 * mipi_dsi_turn_on_peripheral() - sends a Turn On Peripheral command 607 * @dsi: DSI peripheral device 608 * 609 * This function is deprecated. Use mipi_dsi_turn_on_peripheral_multi() instead. 610 * 611 * Return: 0 on success or a negative error code on failure. 612 */ 613 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi) 614 { 615 struct mipi_dsi_msg msg = { 616 .channel = dsi->channel, 617 .type = MIPI_DSI_TURN_ON_PERIPHERAL, 618 .tx_buf = (u8 [2]) { 0, 0 }, 619 .tx_len = 2, 620 }; 621 int ret = mipi_dsi_device_transfer(dsi, &msg); 622 623 return (ret < 0) ? ret : 0; 624 } 625 EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral); 626 627 /* 628 * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of 629 * the payload in a long packet transmitted from the peripheral back to the 630 * host processor 631 * @dsi: DSI peripheral device 632 * @value: the maximum size of the payload 633 * 634 * Return: 0 on success or a negative error code on failure. 635 */ 636 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi, 637 u16 value) 638 { 639 u8 tx[2] = { value & 0xff, value >> 8 }; 640 struct mipi_dsi_msg msg = { 641 .channel = dsi->channel, 642 .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE, 643 .tx_len = sizeof(tx), 644 .tx_buf = tx, 645 }; 646 int ret = mipi_dsi_device_transfer(dsi, &msg); 647 648 return (ret < 0) ? ret : 0; 649 } 650 EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size); 651 652 /** 653 * mipi_dsi_compression_mode_ext() - enable/disable DSC on the peripheral 654 * @dsi: DSI peripheral device 655 * @enable: Whether to enable or disable the DSC 656 * @algo: Selected compression algorithm 657 * @pps_selector: Select PPS from the table of pre-stored or uploaded PPS entries 658 * 659 * Enable or disable Display Stream Compression on the peripheral. 660 * This function is deprecated. Use mipi_dsi_compression_mode_ext_multi() instead. 661 * 662 * Return: 0 on success or a negative error code on failure. 663 */ 664 int mipi_dsi_compression_mode_ext(struct mipi_dsi_device *dsi, bool enable, 665 enum mipi_dsi_compression_algo algo, 666 unsigned int pps_selector) 667 { 668 u8 tx[2] = { }; 669 struct mipi_dsi_msg msg = { 670 .channel = dsi->channel, 671 .type = MIPI_DSI_COMPRESSION_MODE, 672 .tx_len = sizeof(tx), 673 .tx_buf = tx, 674 }; 675 int ret; 676 677 if (algo > 3 || pps_selector > 3) 678 return -EINVAL; 679 680 tx[0] = (enable << 0) | 681 (algo << 1) | 682 (pps_selector << 4); 683 684 ret = mipi_dsi_device_transfer(dsi, &msg); 685 686 return (ret < 0) ? ret : 0; 687 } 688 EXPORT_SYMBOL(mipi_dsi_compression_mode_ext); 689 690 /** 691 * mipi_dsi_compression_mode() - enable/disable DSC on the peripheral 692 * @dsi: DSI peripheral device 693 * @enable: Whether to enable or disable the DSC 694 * 695 * Enable or disable Display Stream Compression on the peripheral using the 696 * default Picture Parameter Set and VESA DSC 1.1 algorithm. 697 * 698 * Return: 0 on success or a negative error code on failure. 699 */ 700 int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable) 701 { 702 return mipi_dsi_compression_mode_ext(dsi, enable, MIPI_DSI_COMPRESSION_DSC, 0); 703 } 704 EXPORT_SYMBOL(mipi_dsi_compression_mode); 705 706 /** 707 * mipi_dsi_picture_parameter_set() - transmit the DSC PPS to the peripheral 708 * @dsi: DSI peripheral device 709 * @pps: VESA DSC 1.1 Picture Parameter Set 710 * 711 * Transmit the VESA DSC 1.1 Picture Parameter Set to the peripheral. 712 * This function is deprecated. Use mipi_dsi_picture_parameter_set_multi() instead. 713 * 714 * Return: 0 on success or a negative error code on failure. 715 */ 716 int mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi, 717 const struct drm_dsc_picture_parameter_set *pps) 718 { 719 struct mipi_dsi_msg msg = { 720 .channel = dsi->channel, 721 .type = MIPI_DSI_PICTURE_PARAMETER_SET, 722 .tx_len = sizeof(*pps), 723 .tx_buf = pps, 724 }; 725 int ret = mipi_dsi_device_transfer(dsi, &msg); 726 727 return (ret < 0) ? ret : 0; 728 } 729 EXPORT_SYMBOL(mipi_dsi_picture_parameter_set); 730 731 /** 732 * mipi_dsi_generic_write() - transmit data using a generic write packet 733 * @dsi: DSI peripheral device 734 * @payload: buffer containing the payload 735 * @size: size of payload buffer 736 * 737 * This function will automatically choose the right data type depending on 738 * the payload length. 739 * 740 * Return: The number of bytes transmitted on success or a negative error code 741 * on failure. 742 */ 743 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload, 744 size_t size) 745 { 746 struct mipi_dsi_msg msg = { 747 .channel = dsi->channel, 748 .tx_buf = payload, 749 .tx_len = size 750 }; 751 752 switch (size) { 753 case 0: 754 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM; 755 break; 756 757 case 1: 758 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM; 759 break; 760 761 case 2: 762 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM; 763 break; 764 765 default: 766 msg.type = MIPI_DSI_GENERIC_LONG_WRITE; 767 break; 768 } 769 770 return mipi_dsi_device_transfer(dsi, &msg); 771 } 772 EXPORT_SYMBOL(mipi_dsi_generic_write); 773 774 /** 775 * mipi_dsi_generic_write_chatty() - mipi_dsi_generic_write() w/ an error log 776 * @dsi: DSI peripheral device 777 * @payload: buffer containing the payload 778 * @size: size of payload buffer 779 * 780 * Like mipi_dsi_generic_write() but includes a dev_err() 781 * call for you and returns 0 upon success, not the number of bytes sent. 782 * 783 * Return: 0 on success or a negative error code on failure. 784 */ 785 int mipi_dsi_generic_write_chatty(struct mipi_dsi_device *dsi, 786 const void *payload, size_t size) 787 { 788 struct device *dev = &dsi->dev; 789 ssize_t ret; 790 791 ret = mipi_dsi_generic_write(dsi, payload, size); 792 if (ret < 0) { 793 dev_err(dev, "sending generic data %*ph failed: %zd\n", 794 (int)size, payload, ret); 795 return ret; 796 } 797 798 return 0; 799 } 800 EXPORT_SYMBOL(mipi_dsi_generic_write_chatty); 801 802 /** 803 * mipi_dsi_generic_write_multi() - mipi_dsi_generic_write_chatty() w/ accum_err 804 * @ctx: Context for multiple DSI transactions 805 * @payload: buffer containing the payload 806 * @size: size of payload buffer 807 * 808 * Like mipi_dsi_generic_write_chatty() but deals with errors in a way that 809 * makes it convenient to make several calls in a row. 810 */ 811 void mipi_dsi_generic_write_multi(struct mipi_dsi_multi_context *ctx, 812 const void *payload, size_t size) 813 { 814 struct mipi_dsi_device *dsi = ctx->dsi; 815 struct device *dev = &dsi->dev; 816 ssize_t ret; 817 818 if (ctx->accum_err) 819 return; 820 821 ret = mipi_dsi_generic_write(dsi, payload, size); 822 if (ret < 0) { 823 ctx->accum_err = ret; 824 dev_err(dev, "sending generic data %*ph failed: %d\n", 825 (int)size, payload, ctx->accum_err); 826 } 827 } 828 EXPORT_SYMBOL(mipi_dsi_generic_write_multi); 829 830 /** 831 * mipi_dsi_generic_read() - receive data using a generic read packet 832 * @dsi: DSI peripheral device 833 * @params: buffer containing the request parameters 834 * @num_params: number of request parameters 835 * @data: buffer in which to return the received data 836 * @size: size of receive buffer 837 * 838 * This function will automatically choose the right data type depending on 839 * the number of parameters passed in. 840 * 841 * Return: The number of bytes successfully read or a negative error code on 842 * failure. 843 */ 844 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params, 845 size_t num_params, void *data, size_t size) 846 { 847 struct mipi_dsi_msg msg = { 848 .channel = dsi->channel, 849 .tx_len = num_params, 850 .tx_buf = params, 851 .rx_len = size, 852 .rx_buf = data 853 }; 854 855 switch (num_params) { 856 case 0: 857 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM; 858 break; 859 860 case 1: 861 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM; 862 break; 863 864 case 2: 865 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM; 866 break; 867 868 default: 869 return -EINVAL; 870 } 871 872 return mipi_dsi_device_transfer(dsi, &msg); 873 } 874 EXPORT_SYMBOL(mipi_dsi_generic_read); 875 876 /** 877 * drm_mipi_dsi_get_input_bus_fmt() - Get the required MEDIA_BUS_FMT_* based 878 * input pixel format for a given DSI output 879 * pixel format 880 * @dsi_format: pixel format that a DSI host needs to output 881 * 882 * Various DSI hosts can use this function during their 883 * &drm_bridge_funcs.atomic_get_input_bus_fmts operation to ascertain 884 * the MEDIA_BUS_FMT_* pixel format required as input. 885 * 886 * RETURNS: 887 * a 32-bit MEDIA_BUS_FMT_* value on success or 0 in case of failure. 888 */ 889 u32 drm_mipi_dsi_get_input_bus_fmt(enum mipi_dsi_pixel_format dsi_format) 890 { 891 switch (dsi_format) { 892 case MIPI_DSI_FMT_RGB888: 893 return MEDIA_BUS_FMT_RGB888_1X24; 894 895 case MIPI_DSI_FMT_RGB666: 896 return MEDIA_BUS_FMT_RGB666_1X24_CPADHI; 897 898 case MIPI_DSI_FMT_RGB666_PACKED: 899 return MEDIA_BUS_FMT_RGB666_1X18; 900 901 case MIPI_DSI_FMT_RGB565: 902 return MEDIA_BUS_FMT_RGB565_1X16; 903 904 default: 905 /* Unsupported DSI Format */ 906 return 0; 907 } 908 } 909 EXPORT_SYMBOL(drm_mipi_dsi_get_input_bus_fmt); 910 911 /** 912 * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload 913 * @dsi: DSI peripheral device 914 * @data: buffer containing data to be transmitted 915 * @len: size of transmission buffer 916 * 917 * This function will automatically choose the right data type depending on 918 * the command payload length. 919 * 920 * Return: The number of bytes successfully transmitted or a negative error 921 * code on failure. 922 */ 923 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi, 924 const void *data, size_t len) 925 { 926 struct mipi_dsi_msg msg = { 927 .channel = dsi->channel, 928 .tx_buf = data, 929 .tx_len = len 930 }; 931 932 switch (len) { 933 case 0: 934 return -EINVAL; 935 936 case 1: 937 msg.type = MIPI_DSI_DCS_SHORT_WRITE; 938 break; 939 940 case 2: 941 msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM; 942 break; 943 944 default: 945 msg.type = MIPI_DSI_DCS_LONG_WRITE; 946 break; 947 } 948 949 return mipi_dsi_device_transfer(dsi, &msg); 950 } 951 EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer); 952 953 /** 954 * mipi_dsi_dcs_write_buffer_chatty - mipi_dsi_dcs_write_buffer() w/ an error log 955 * @dsi: DSI peripheral device 956 * @data: buffer containing data to be transmitted 957 * @len: size of transmission buffer 958 * 959 * Like mipi_dsi_dcs_write_buffer() but includes a dev_err() 960 * call for you and returns 0 upon success, not the number of bytes sent. 961 * 962 * Return: 0 on success or a negative error code on failure. 963 */ 964 int mipi_dsi_dcs_write_buffer_chatty(struct mipi_dsi_device *dsi, 965 const void *data, size_t len) 966 { 967 struct device *dev = &dsi->dev; 968 ssize_t ret; 969 970 ret = mipi_dsi_dcs_write_buffer(dsi, data, len); 971 if (ret < 0) { 972 dev_err(dev, "sending dcs data %*ph failed: %zd\n", 973 (int)len, data, ret); 974 return ret; 975 } 976 977 return 0; 978 } 979 EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer_chatty); 980 981 /** 982 * mipi_dsi_dcs_write_buffer_multi - mipi_dsi_dcs_write_buffer_chatty() w/ accum_err 983 * @ctx: Context for multiple DSI transactions 984 * @data: buffer containing data to be transmitted 985 * @len: size of transmission buffer 986 * 987 * Like mipi_dsi_dcs_write_buffer_chatty() but deals with errors in a way that 988 * makes it convenient to make several calls in a row. 989 */ 990 void mipi_dsi_dcs_write_buffer_multi(struct mipi_dsi_multi_context *ctx, 991 const void *data, size_t len) 992 { 993 struct mipi_dsi_device *dsi = ctx->dsi; 994 struct device *dev = &dsi->dev; 995 ssize_t ret; 996 997 if (ctx->accum_err) 998 return; 999 1000 ret = mipi_dsi_dcs_write_buffer(dsi, data, len); 1001 if (ret < 0) { 1002 ctx->accum_err = ret; 1003 dev_err(dev, "sending dcs data %*ph failed: %d\n", 1004 (int)len, data, ctx->accum_err); 1005 } 1006 } 1007 EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer_multi); 1008 1009 /** 1010 * mipi_dsi_dcs_write() - send DCS write command 1011 * @dsi: DSI peripheral device 1012 * @cmd: DCS command 1013 * @data: buffer containing the command payload 1014 * @len: command payload length 1015 * 1016 * This function will automatically choose the right data type depending on 1017 * the command payload length. 1018 * 1019 * Return: The number of bytes successfully transmitted or a negative error 1020 * code on failure. 1021 */ 1022 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd, 1023 const void *data, size_t len) 1024 { 1025 ssize_t err; 1026 size_t size; 1027 u8 stack_tx[8]; 1028 u8 *tx; 1029 1030 size = 1 + len; 1031 if (len > ARRAY_SIZE(stack_tx) - 1) { 1032 tx = kmalloc(size, GFP_KERNEL); 1033 if (!tx) 1034 return -ENOMEM; 1035 } else { 1036 tx = stack_tx; 1037 } 1038 1039 /* concatenate the DCS command byte and the payload */ 1040 tx[0] = cmd; 1041 if (data) 1042 memcpy(&tx[1], data, len); 1043 1044 err = mipi_dsi_dcs_write_buffer(dsi, tx, size); 1045 1046 if (tx != stack_tx) 1047 kfree(tx); 1048 1049 return err; 1050 } 1051 EXPORT_SYMBOL(mipi_dsi_dcs_write); 1052 1053 /** 1054 * mipi_dsi_dcs_read() - send DCS read request command 1055 * @dsi: DSI peripheral device 1056 * @cmd: DCS command 1057 * @data: buffer in which to receive data 1058 * @len: size of receive buffer 1059 * 1060 * Return: The number of bytes read or a negative error code on failure. 1061 */ 1062 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data, 1063 size_t len) 1064 { 1065 struct mipi_dsi_msg msg = { 1066 .channel = dsi->channel, 1067 .type = MIPI_DSI_DCS_READ, 1068 .tx_buf = &cmd, 1069 .tx_len = 1, 1070 .rx_buf = data, 1071 .rx_len = len 1072 }; 1073 1074 return mipi_dsi_device_transfer(dsi, &msg); 1075 } 1076 EXPORT_SYMBOL(mipi_dsi_dcs_read); 1077 1078 /** 1079 * mipi_dsi_dcs_nop() - send DCS nop packet 1080 * @dsi: DSI peripheral device 1081 * 1082 * This function is deprecated. Use mipi_dsi_dcs_nop_multi() instead. 1083 * 1084 * Return: 0 on success or a negative error code on failure. 1085 */ 1086 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi) 1087 { 1088 ssize_t err; 1089 1090 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0); 1091 if (err < 0) 1092 return err; 1093 1094 return 0; 1095 } 1096 EXPORT_SYMBOL(mipi_dsi_dcs_nop); 1097 1098 /** 1099 * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module 1100 * @dsi: DSI peripheral device 1101 * 1102 * This function is deprecated. Use mipi_dsi_dcs_soft_reset_multi() instead. 1103 * 1104 * Return: 0 on success or a negative error code on failure. 1105 */ 1106 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi) 1107 { 1108 ssize_t err; 1109 1110 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0); 1111 if (err < 0) 1112 return err; 1113 1114 return 0; 1115 } 1116 EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset); 1117 1118 /** 1119 * mipi_dsi_dcs_get_power_mode() - query the display module's current power 1120 * mode 1121 * @dsi: DSI peripheral device 1122 * @mode: return location for the current power mode 1123 * 1124 * Return: 0 on success or a negative error code on failure. 1125 */ 1126 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode) 1127 { 1128 ssize_t err; 1129 1130 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode, 1131 sizeof(*mode)); 1132 if (err <= 0) { 1133 if (err == 0) 1134 err = -ENODATA; 1135 1136 return err; 1137 } 1138 1139 return 0; 1140 } 1141 EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode); 1142 1143 /** 1144 * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image 1145 * data used by the interface 1146 * @dsi: DSI peripheral device 1147 * @format: return location for the pixel format 1148 * 1149 * Return: 0 on success or a negative error code on failure. 1150 */ 1151 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format) 1152 { 1153 ssize_t err; 1154 1155 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format, 1156 sizeof(*format)); 1157 if (err <= 0) { 1158 if (err == 0) 1159 err = -ENODATA; 1160 1161 return err; 1162 } 1163 1164 return 0; 1165 } 1166 EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format); 1167 1168 /** 1169 * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the 1170 * display module except interface communication 1171 * @dsi: DSI peripheral device 1172 * 1173 * This function is deprecated. Use mipi_dsi_dcs_enter_sleep_mode_multi() instead. 1174 * 1175 * Return: 0 on success or a negative error code on failure. 1176 */ 1177 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi) 1178 { 1179 ssize_t err; 1180 1181 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0); 1182 if (err < 0) 1183 return err; 1184 1185 return 0; 1186 } 1187 EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode); 1188 1189 /** 1190 * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display 1191 * module 1192 * @dsi: DSI peripheral device 1193 * 1194 * This function is deprecated. Use mipi_dsi_dcs_exit_sleep_mode_multi() instead. 1195 * 1196 * Return: 0 on success or a negative error code on failure. 1197 */ 1198 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi) 1199 { 1200 ssize_t err; 1201 1202 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0); 1203 if (err < 0) 1204 return err; 1205 1206 return 0; 1207 } 1208 EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode); 1209 1210 /** 1211 * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the 1212 * display device 1213 * @dsi: DSI peripheral device 1214 * 1215 * This function is deprecated. Use mipi_dsi_dcs_set_display_off_multi() instead. 1216 * 1217 * Return: 0 on success or a negative error code on failure. 1218 */ 1219 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi) 1220 { 1221 ssize_t err; 1222 1223 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0); 1224 if (err < 0) 1225 return err; 1226 1227 return 0; 1228 } 1229 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off); 1230 1231 /** 1232 * mipi_dsi_dcs_set_display_on() - start displaying the image data on the 1233 * display device 1234 * @dsi: DSI peripheral device 1235 * 1236 * This function is deprecated. Use mipi_dsi_dcs_set_display_on_multi() instead. 1237 * 1238 * Return: 0 on success or a negative error code on failure 1239 */ 1240 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi) 1241 { 1242 ssize_t err; 1243 1244 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0); 1245 if (err < 0) 1246 return err; 1247 1248 return 0; 1249 } 1250 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on); 1251 1252 /** 1253 * mipi_dsi_dcs_set_column_address() - define the column extent of the frame 1254 * memory accessed by the host processor 1255 * @dsi: DSI peripheral device 1256 * @start: first column of frame memory 1257 * @end: last column of frame memory 1258 * 1259 * This function is deprecated. Use mipi_dsi_dcs_set_column_address_multi() 1260 * instead. 1261 * 1262 * Return: 0 on success or a negative error code on failure. 1263 */ 1264 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start, 1265 u16 end) 1266 { 1267 u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff }; 1268 ssize_t err; 1269 1270 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload, 1271 sizeof(payload)); 1272 if (err < 0) 1273 return err; 1274 1275 return 0; 1276 } 1277 EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address); 1278 1279 /** 1280 * mipi_dsi_dcs_set_page_address() - define the page extent of the frame 1281 * memory accessed by the host processor 1282 * @dsi: DSI peripheral device 1283 * @start: first page of frame memory 1284 * @end: last page of frame memory 1285 * 1286 * This function is deprecated. Use mipi_dsi_dcs_set_page_address_multi() 1287 * instead. 1288 * 1289 * Return: 0 on success or a negative error code on failure. 1290 */ 1291 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start, 1292 u16 end) 1293 { 1294 u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff }; 1295 ssize_t err; 1296 1297 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload, 1298 sizeof(payload)); 1299 if (err < 0) 1300 return err; 1301 1302 return 0; 1303 } 1304 EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address); 1305 1306 /** 1307 * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect 1308 * output signal on the TE signal line. 1309 * @dsi: DSI peripheral device 1310 * @mode: the Tearing Effect Output Line mode 1311 * 1312 * This function is deprecated. Use mipi_dsi_dcs_set_tear_on_multi() instead. 1313 * 1314 * Return: 0 on success or a negative error code on failure 1315 */ 1316 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi, 1317 enum mipi_dsi_dcs_tear_mode mode) 1318 { 1319 u8 value = mode; 1320 ssize_t err; 1321 1322 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value, 1323 sizeof(value)); 1324 if (err < 0) 1325 return err; 1326 1327 return 0; 1328 } 1329 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on); 1330 1331 /** 1332 * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image 1333 * data used by the interface 1334 * @dsi: DSI peripheral device 1335 * @format: pixel format 1336 * 1337 * This function is deprecated. Use mipi_dsi_dcs_set_pixel_format_multi() 1338 * instead. 1339 * 1340 * Return: 0 on success or a negative error code on failure. 1341 */ 1342 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format) 1343 { 1344 ssize_t err; 1345 1346 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format, 1347 sizeof(format)); 1348 if (err < 0) 1349 return err; 1350 1351 return 0; 1352 } 1353 EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format); 1354 1355 /** 1356 * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for 1357 * the Tearing Effect output signal of the display module 1358 * @dsi: DSI peripheral device 1359 * @scanline: scanline to use as trigger 1360 * 1361 * This function is deprecated. Use mipi_dsi_dcs_set_tear_scanline_multi() 1362 * instead. 1363 * 1364 * Return: 0 on success or a negative error code on failure 1365 */ 1366 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline) 1367 { 1368 u8 payload[2] = { scanline >> 8, scanline & 0xff }; 1369 ssize_t err; 1370 1371 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_SCANLINE, payload, 1372 sizeof(payload)); 1373 if (err < 0) 1374 return err; 1375 1376 return 0; 1377 } 1378 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline); 1379 1380 /** 1381 * mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the 1382 * display 1383 * @dsi: DSI peripheral device 1384 * @brightness: brightness value 1385 * 1386 * This function is deprecated. Use mipi_dsi_dcs_set_display_brightness_multi() 1387 * instead. 1388 * 1389 * Return: 0 on success or a negative error code on failure. 1390 */ 1391 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi, 1392 u16 brightness) 1393 { 1394 u8 payload[2] = { brightness & 0xff, brightness >> 8 }; 1395 ssize_t err; 1396 1397 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, 1398 payload, sizeof(payload)); 1399 if (err < 0) 1400 return err; 1401 1402 return 0; 1403 } 1404 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness); 1405 1406 /** 1407 * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value 1408 * of the display 1409 * @dsi: DSI peripheral device 1410 * @brightness: brightness value 1411 * 1412 * Return: 0 on success or a negative error code on failure. 1413 */ 1414 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi, 1415 u16 *brightness) 1416 { 1417 ssize_t err; 1418 1419 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS, 1420 brightness, sizeof(*brightness)); 1421 if (err <= 0) { 1422 if (err == 0) 1423 err = -ENODATA; 1424 1425 return err; 1426 } 1427 1428 return 0; 1429 } 1430 EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness); 1431 1432 /** 1433 * mipi_dsi_dcs_set_display_brightness_large() - sets the 16-bit brightness value 1434 * of the display 1435 * @dsi: DSI peripheral device 1436 * @brightness: brightness value 1437 * 1438 * Return: 0 on success or a negative error code on failure. 1439 */ 1440 int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi, 1441 u16 brightness) 1442 { 1443 u8 payload[2] = { brightness >> 8, brightness & 0xff }; 1444 ssize_t err; 1445 1446 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, 1447 payload, sizeof(payload)); 1448 if (err < 0) 1449 return err; 1450 1451 return 0; 1452 } 1453 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness_large); 1454 1455 /** 1456 * mipi_dsi_dcs_get_display_brightness_large() - gets the current 16-bit 1457 * brightness value of the display 1458 * @dsi: DSI peripheral device 1459 * @brightness: brightness value 1460 * 1461 * Return: 0 on success or a negative error code on failure. 1462 */ 1463 int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi, 1464 u16 *brightness) 1465 { 1466 u8 brightness_be[2]; 1467 ssize_t err; 1468 1469 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS, 1470 brightness_be, sizeof(brightness_be)); 1471 if (err <= 0) { 1472 if (err == 0) 1473 err = -ENODATA; 1474 1475 return err; 1476 } 1477 1478 *brightness = (brightness_be[0] << 8) | brightness_be[1]; 1479 1480 return 0; 1481 } 1482 EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness_large); 1483 1484 /** 1485 * mipi_dsi_picture_parameter_set_multi() - transmit the DSC PPS to the peripheral 1486 * @ctx: Context for multiple DSI transactions 1487 * @pps: VESA DSC 1.1 Picture Parameter Set 1488 * 1489 * Like mipi_dsi_picture_parameter_set() but deals with errors in a way that 1490 * makes it convenient to make several calls in a row. 1491 */ 1492 void mipi_dsi_picture_parameter_set_multi(struct mipi_dsi_multi_context *ctx, 1493 const struct drm_dsc_picture_parameter_set *pps) 1494 { 1495 struct mipi_dsi_device *dsi = ctx->dsi; 1496 struct device *dev = &dsi->dev; 1497 ssize_t ret; 1498 1499 if (ctx->accum_err) 1500 return; 1501 1502 ret = mipi_dsi_picture_parameter_set(dsi, pps); 1503 if (ret < 0) { 1504 ctx->accum_err = ret; 1505 dev_err(dev, "sending PPS failed: %d\n", 1506 ctx->accum_err); 1507 } 1508 } 1509 EXPORT_SYMBOL(mipi_dsi_picture_parameter_set_multi); 1510 1511 /** 1512 * mipi_dsi_compression_mode_ext_multi() - enable/disable DSC on the peripheral 1513 * @ctx: Context for multiple DSI transactions 1514 * @enable: Whether to enable or disable the DSC 1515 * @algo: Selected compression algorithm 1516 * @pps_selector: Select PPS from the table of pre-stored or uploaded PPS entries 1517 * 1518 * Like mipi_dsi_compression_mode_ext() but deals with errors in a way that 1519 * makes it convenient to make several calls in a row. 1520 */ 1521 void mipi_dsi_compression_mode_ext_multi(struct mipi_dsi_multi_context *ctx, 1522 bool enable, 1523 enum mipi_dsi_compression_algo algo, 1524 unsigned int pps_selector) 1525 { 1526 struct mipi_dsi_device *dsi = ctx->dsi; 1527 struct device *dev = &dsi->dev; 1528 ssize_t ret; 1529 1530 if (ctx->accum_err) 1531 return; 1532 1533 ret = mipi_dsi_compression_mode_ext(dsi, enable, algo, pps_selector); 1534 if (ret < 0) { 1535 ctx->accum_err = ret; 1536 dev_err(dev, "sending COMPRESSION_MODE failed: %d\n", 1537 ctx->accum_err); 1538 } 1539 } 1540 EXPORT_SYMBOL(mipi_dsi_compression_mode_ext_multi); 1541 1542 /** 1543 * mipi_dsi_compression_mode_multi() - enable/disable DSC on the peripheral 1544 * @ctx: Context for multiple DSI transactions 1545 * @enable: Whether to enable or disable the DSC 1546 * 1547 * Enable or disable Display Stream Compression on the peripheral using the 1548 * default Picture Parameter Set and VESA DSC 1.1 algorithm. 1549 */ 1550 void mipi_dsi_compression_mode_multi(struct mipi_dsi_multi_context *ctx, 1551 bool enable) 1552 { 1553 return mipi_dsi_compression_mode_ext_multi(ctx, enable, 1554 MIPI_DSI_COMPRESSION_DSC, 0); 1555 } 1556 EXPORT_SYMBOL(mipi_dsi_compression_mode_multi); 1557 1558 /** 1559 * mipi_dsi_dcs_nop_multi() - send DCS NOP packet 1560 * @ctx: Context for multiple DSI transactions 1561 * 1562 * Like mipi_dsi_dcs_nop() but deals with errors in a way that 1563 * makes it convenient to make several calls in a row. 1564 */ 1565 void mipi_dsi_dcs_nop_multi(struct mipi_dsi_multi_context *ctx) 1566 { 1567 struct mipi_dsi_device *dsi = ctx->dsi; 1568 struct device *dev = &dsi->dev; 1569 ssize_t ret; 1570 1571 if (ctx->accum_err) 1572 return; 1573 1574 ret = mipi_dsi_dcs_nop(dsi); 1575 if (ret < 0) { 1576 ctx->accum_err = ret; 1577 dev_err(dev, "sending DCS NOP failed: %d\n", 1578 ctx->accum_err); 1579 } 1580 } 1581 EXPORT_SYMBOL(mipi_dsi_dcs_nop_multi); 1582 1583 /** 1584 * mipi_dsi_dcs_enter_sleep_mode_multi() - send DCS ENTER_SLEEP_MODE packet 1585 * @ctx: Context for multiple DSI transactions 1586 * 1587 * Like mipi_dsi_dcs_enter_sleep_mode() but deals with errors in a way that 1588 * makes it convenient to make several calls in a row. 1589 */ 1590 void mipi_dsi_dcs_enter_sleep_mode_multi(struct mipi_dsi_multi_context *ctx) 1591 { 1592 struct mipi_dsi_device *dsi = ctx->dsi; 1593 struct device *dev = &dsi->dev; 1594 ssize_t ret; 1595 1596 if (ctx->accum_err) 1597 return; 1598 1599 ret = mipi_dsi_dcs_enter_sleep_mode(dsi); 1600 if (ret < 0) { 1601 ctx->accum_err = ret; 1602 dev_err(dev, "sending DCS ENTER_SLEEP_MODE failed: %d\n", 1603 ctx->accum_err); 1604 } 1605 } 1606 EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode_multi); 1607 1608 /** 1609 * mipi_dsi_dcs_exit_sleep_mode_multi() - send DCS EXIT_SLEEP_MODE packet 1610 * @ctx: Context for multiple DSI transactions 1611 * 1612 * Like mipi_dsi_dcs_exit_sleep_mode() but deals with errors in a way that 1613 * makes it convenient to make several calls in a row. 1614 */ 1615 void mipi_dsi_dcs_exit_sleep_mode_multi(struct mipi_dsi_multi_context *ctx) 1616 { 1617 struct mipi_dsi_device *dsi = ctx->dsi; 1618 struct device *dev = &dsi->dev; 1619 ssize_t ret; 1620 1621 if (ctx->accum_err) 1622 return; 1623 1624 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 1625 if (ret < 0) { 1626 ctx->accum_err = ret; 1627 dev_err(dev, "sending DCS EXIT_SLEEP_MODE failed: %d\n", 1628 ctx->accum_err); 1629 } 1630 } 1631 EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode_multi); 1632 1633 /** 1634 * mipi_dsi_dcs_set_display_off_multi() - send DCS SET_DISPLAY_OFF packet 1635 * @ctx: Context for multiple DSI transactions 1636 * 1637 * Like mipi_dsi_dcs_set_display_off() but deals with errors in a way that 1638 * makes it convenient to make several calls in a row. 1639 */ 1640 void mipi_dsi_dcs_set_display_off_multi(struct mipi_dsi_multi_context *ctx) 1641 { 1642 struct mipi_dsi_device *dsi = ctx->dsi; 1643 struct device *dev = &dsi->dev; 1644 ssize_t ret; 1645 1646 if (ctx->accum_err) 1647 return; 1648 1649 ret = mipi_dsi_dcs_set_display_off(dsi); 1650 if (ret < 0) { 1651 ctx->accum_err = ret; 1652 dev_err(dev, "sending DCS SET_DISPLAY_OFF failed: %d\n", 1653 ctx->accum_err); 1654 } 1655 } 1656 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off_multi); 1657 1658 /** 1659 * mipi_dsi_dcs_set_display_on_multi() - send DCS SET_DISPLAY_ON packet 1660 * @ctx: Context for multiple DSI transactions 1661 * 1662 * Like mipi_dsi_dcs_set_display_on() but deals with errors in a way that 1663 * makes it convenient to make several calls in a row. 1664 */ 1665 void mipi_dsi_dcs_set_display_on_multi(struct mipi_dsi_multi_context *ctx) 1666 { 1667 struct mipi_dsi_device *dsi = ctx->dsi; 1668 struct device *dev = &dsi->dev; 1669 ssize_t ret; 1670 1671 if (ctx->accum_err) 1672 return; 1673 1674 ret = mipi_dsi_dcs_set_display_on(dsi); 1675 if (ret < 0) { 1676 ctx->accum_err = ret; 1677 dev_err(dev, "sending DCS SET_DISPLAY_ON failed: %d\n", 1678 ctx->accum_err); 1679 } 1680 } 1681 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on_multi); 1682 1683 /** 1684 * mipi_dsi_dcs_set_tear_on_multi() - send DCS SET_TEAR_ON packet 1685 * @ctx: Context for multiple DSI transactions 1686 * @mode: the Tearing Effect Output Line mode 1687 * 1688 * Like mipi_dsi_dcs_set_tear_on() but deals with errors in a way that 1689 * makes it convenient to make several calls in a row. 1690 */ 1691 void mipi_dsi_dcs_set_tear_on_multi(struct mipi_dsi_multi_context *ctx, 1692 enum mipi_dsi_dcs_tear_mode mode) 1693 { 1694 struct mipi_dsi_device *dsi = ctx->dsi; 1695 struct device *dev = &dsi->dev; 1696 ssize_t ret; 1697 1698 if (ctx->accum_err) 1699 return; 1700 1701 ret = mipi_dsi_dcs_set_tear_on(dsi, mode); 1702 if (ret < 0) { 1703 ctx->accum_err = ret; 1704 dev_err(dev, "sending DCS SET_TEAR_ON failed: %d\n", 1705 ctx->accum_err); 1706 } 1707 } 1708 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on_multi); 1709 1710 /** 1711 * mipi_dsi_turn_on_peripheral_multi() - sends a Turn On Peripheral command 1712 * @ctx: Context for multiple DSI transactions 1713 * 1714 * Like mipi_dsi_turn_on_peripheral() but deals with errors in a way that 1715 * makes it convenient to make several calls in a row. 1716 */ 1717 void mipi_dsi_turn_on_peripheral_multi(struct mipi_dsi_multi_context *ctx) 1718 { 1719 struct mipi_dsi_device *dsi = ctx->dsi; 1720 struct device *dev = &dsi->dev; 1721 int ret; 1722 1723 if (ctx->accum_err) 1724 return; 1725 1726 ret = mipi_dsi_turn_on_peripheral(dsi); 1727 if (ret < 0) { 1728 ctx->accum_err = ret; 1729 dev_err(dev, "Failed to turn on peripheral: %d\n", 1730 ctx->accum_err); 1731 } 1732 } 1733 EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral_multi); 1734 1735 /** 1736 * mipi_dsi_dcs_set_tear_off_multi() - turn off the display module's Tearing Effect 1737 * output signal on the TE signal line 1738 * @ctx: Context for multiple DSI transactions 1739 */ 1740 void mipi_dsi_dcs_set_tear_off_multi(struct mipi_dsi_multi_context *ctx) 1741 { 1742 struct mipi_dsi_device *dsi = ctx->dsi; 1743 struct device *dev = &dsi->dev; 1744 ssize_t err; 1745 1746 if (ctx->accum_err) 1747 return; 1748 1749 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0); 1750 if (err < 0) { 1751 ctx->accum_err = err; 1752 dev_err(dev, "Failed to set tear off: %d\n", 1753 ctx->accum_err); 1754 } 1755 } 1756 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off_multi); 1757 1758 /** 1759 * mipi_dsi_dcs_soft_reset_multi() - perform a software reset of the display module 1760 * @ctx: Context for multiple DSI transactions 1761 * 1762 * Like mipi_dsi_dcs_soft_reset() but deals with errors in a way that 1763 * makes it convenient to make several calls in a row. 1764 */ 1765 void mipi_dsi_dcs_soft_reset_multi(struct mipi_dsi_multi_context *ctx) 1766 { 1767 struct mipi_dsi_device *dsi = ctx->dsi; 1768 struct device *dev = &dsi->dev; 1769 int ret; 1770 1771 if (ctx->accum_err) 1772 return; 1773 1774 ret = mipi_dsi_dcs_soft_reset(dsi); 1775 if (ret < 0) { 1776 ctx->accum_err = ret; 1777 dev_err(dev, "Failed to mipi_dsi_dcs_soft_reset: %d\n", 1778 ctx->accum_err); 1779 } 1780 } 1781 EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset_multi); 1782 1783 /** 1784 * mipi_dsi_dcs_set_display_brightness_multi() - sets the brightness value of 1785 * the display 1786 * @ctx: Context for multiple DSI transactions 1787 * @brightness: brightness value 1788 * 1789 * Like mipi_dsi_dcs_set_display_brightness() but deals with errors in a way that 1790 * makes it convenient to make several calls in a row. 1791 */ 1792 void mipi_dsi_dcs_set_display_brightness_multi(struct mipi_dsi_multi_context *ctx, 1793 u16 brightness) 1794 { 1795 struct mipi_dsi_device *dsi = ctx->dsi; 1796 struct device *dev = &dsi->dev; 1797 int ret; 1798 1799 if (ctx->accum_err) 1800 return; 1801 1802 ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness); 1803 if (ret < 0) { 1804 ctx->accum_err = ret; 1805 dev_err(dev, "Failed to write display brightness: %d\n", 1806 ctx->accum_err); 1807 } 1808 } 1809 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness_multi); 1810 1811 /** 1812 * mipi_dsi_dcs_set_pixel_format_multi() - sets the pixel format for the RGB image 1813 * data used by the interface 1814 * @ctx: Context for multiple DSI transactions 1815 * @format: pixel format 1816 * 1817 * Like mipi_dsi_dcs_set_pixel_format() but deals with errors in a way that 1818 * makes it convenient to make several calls in a row. 1819 */ 1820 void mipi_dsi_dcs_set_pixel_format_multi(struct mipi_dsi_multi_context *ctx, 1821 u8 format) 1822 { 1823 struct mipi_dsi_device *dsi = ctx->dsi; 1824 struct device *dev = &dsi->dev; 1825 int ret; 1826 1827 if (ctx->accum_err) 1828 return; 1829 1830 ret = mipi_dsi_dcs_set_pixel_format(dsi, format); 1831 if (ret < 0) { 1832 ctx->accum_err = ret; 1833 dev_err(dev, "Failed to set pixel format: %d\n", 1834 ctx->accum_err); 1835 } 1836 } 1837 EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format_multi); 1838 1839 /** 1840 * mipi_dsi_dcs_set_column_address_multi() - define the column extent of the 1841 * frame memory accessed by the host processor 1842 * @ctx: Context for multiple DSI transactions 1843 * @start: first column of frame memory 1844 * @end: last column of frame memory 1845 * 1846 * Like mipi_dsi_dcs_set_column_address() but deals with errors in a way that 1847 * makes it convenient to make several calls in a row. 1848 */ 1849 void mipi_dsi_dcs_set_column_address_multi(struct mipi_dsi_multi_context *ctx, 1850 u16 start, u16 end) 1851 { 1852 struct mipi_dsi_device *dsi = ctx->dsi; 1853 struct device *dev = &dsi->dev; 1854 int ret; 1855 1856 if (ctx->accum_err) 1857 return; 1858 1859 ret = mipi_dsi_dcs_set_column_address(dsi, start, end); 1860 if (ret < 0) { 1861 ctx->accum_err = ret; 1862 dev_err(dev, "Failed to set column address: %d\n", 1863 ctx->accum_err); 1864 } 1865 } 1866 EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address_multi); 1867 1868 /** 1869 * mipi_dsi_dcs_set_page_address_multi() - define the page extent of the 1870 * frame memory accessed by the host processor 1871 * @ctx: Context for multiple DSI transactions 1872 * @start: first page of frame memory 1873 * @end: last page of frame memory 1874 * 1875 * Like mipi_dsi_dcs_set_page_address() but deals with errors in a way that 1876 * makes it convenient to make several calls in a row. 1877 */ 1878 void mipi_dsi_dcs_set_page_address_multi(struct mipi_dsi_multi_context *ctx, 1879 u16 start, u16 end) 1880 { 1881 struct mipi_dsi_device *dsi = ctx->dsi; 1882 struct device *dev = &dsi->dev; 1883 int ret; 1884 1885 if (ctx->accum_err) 1886 return; 1887 1888 ret = mipi_dsi_dcs_set_page_address(dsi, start, end); 1889 if (ret < 0) { 1890 ctx->accum_err = ret; 1891 dev_err(dev, "Failed to set page address: %d\n", 1892 ctx->accum_err); 1893 } 1894 } 1895 EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address_multi); 1896 1897 /** 1898 * mipi_dsi_dcs_set_tear_scanline_multi() - set the scanline to use as trigger for 1899 * the Tearing Effect output signal of the display module 1900 * @ctx: Context for multiple DSI transactions 1901 * @scanline: scanline to use as trigger 1902 * 1903 * Like mipi_dsi_dcs_set_tear_scanline() but deals with errors in a way that 1904 * makes it convenient to make several calls in a row. 1905 */ 1906 void mipi_dsi_dcs_set_tear_scanline_multi(struct mipi_dsi_multi_context *ctx, 1907 u16 scanline) 1908 { 1909 struct mipi_dsi_device *dsi = ctx->dsi; 1910 struct device *dev = &dsi->dev; 1911 int ret; 1912 1913 if (ctx->accum_err) 1914 return; 1915 1916 ret = mipi_dsi_dcs_set_tear_scanline(dsi, scanline); 1917 if (ret < 0) { 1918 ctx->accum_err = ret; 1919 dev_err(dev, "Failed to set tear scanline: %d\n", 1920 ctx->accum_err); 1921 } 1922 } 1923 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline_multi); 1924 1925 static int mipi_dsi_drv_probe(struct device *dev) 1926 { 1927 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver); 1928 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); 1929 1930 return drv->probe(dsi); 1931 } 1932 1933 static int mipi_dsi_drv_remove(struct device *dev) 1934 { 1935 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver); 1936 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); 1937 1938 drv->remove(dsi); 1939 1940 return 0; 1941 } 1942 1943 static void mipi_dsi_drv_shutdown(struct device *dev) 1944 { 1945 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver); 1946 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); 1947 1948 drv->shutdown(dsi); 1949 } 1950 1951 /** 1952 * mipi_dsi_driver_register_full() - register a driver for DSI devices 1953 * @drv: DSI driver structure 1954 * @owner: owner module 1955 * 1956 * Return: 0 on success or a negative error code on failure. 1957 */ 1958 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *drv, 1959 struct module *owner) 1960 { 1961 drv->driver.bus = &mipi_dsi_bus_type; 1962 drv->driver.owner = owner; 1963 1964 if (drv->probe) 1965 drv->driver.probe = mipi_dsi_drv_probe; 1966 if (drv->remove) 1967 drv->driver.remove = mipi_dsi_drv_remove; 1968 if (drv->shutdown) 1969 drv->driver.shutdown = mipi_dsi_drv_shutdown; 1970 1971 return driver_register(&drv->driver); 1972 } 1973 EXPORT_SYMBOL(mipi_dsi_driver_register_full); 1974 1975 /** 1976 * mipi_dsi_driver_unregister() - unregister a driver for DSI devices 1977 * @drv: DSI driver structure 1978 * 1979 * Return: 0 on success or a negative error code on failure. 1980 */ 1981 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv) 1982 { 1983 driver_unregister(&drv->driver); 1984 } 1985 EXPORT_SYMBOL(mipi_dsi_driver_unregister); 1986 1987 static int __init mipi_dsi_bus_init(void) 1988 { 1989 return bus_register(&mipi_dsi_bus_type); 1990 } 1991 postcore_initcall(mipi_dsi_bus_init); 1992 1993 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>"); 1994 MODULE_DESCRIPTION("MIPI DSI Bus"); 1995 MODULE_LICENSE("GPL and additional rights"); 1996