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