drm_mipi_dsi.c

   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/export.h>
  30#include <linux/module.h>
  31#include <linux/of.h>
  32#include <linux/of_device.h>
  33#include <linux/pm_runtime.h>
  34#include <linux/slab.h>
  35
  36#include <drm/display/drm_dsc.h>
  37#include <drm/drm_mipi_dsi.h>
  38#include <drm/drm_print.h>
  39
  40#include <linux/media-bus-format.h>
  41
  42#include <video/mipi_display.h>
  43
  44/**
  45 * DOC: dsi helpers
  46 *
  47 * These functions contain some common logic and helpers to deal with MIPI DSI
  48 * peripherals.
  49 *
  50 * Helpers are provided for a number of standard MIPI DSI command as well as a
  51 * subset of the MIPI DCS command set.
  52 */
  53
  54static int mipi_dsi_device_match(struct device *dev, const struct device_driver *drv)
  55{
  56	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
  57
  58	/* attempt OF style match */
  59	if (of_driver_match_device(dev, drv))
  60		return 1;
  61
  62	/* compare DSI device and driver names */
  63	if (!strcmp(dsi->name, drv->name))
  64		return 1;
  65
  66	return 0;
  67}
  68
  69static int mipi_dsi_uevent(const struct device *dev, struct kobj_uevent_env *env)
  70{
  71	const struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
  72	int err;
  73
  74	err = of_device_uevent_modalias(dev, env);
  75	if (err != -ENODEV)
  76		return err;
  77
  78	add_uevent_var(env, "MODALIAS=%s%s", MIPI_DSI_MODULE_PREFIX,
  79		       dsi->name);
  80
  81	return 0;
  82}
  83
  84static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
  85	.runtime_suspend = pm_generic_runtime_suspend,
  86	.runtime_resume = pm_generic_runtime_resume,
  87	.suspend = pm_generic_suspend,
  88	.resume = pm_generic_resume,
  89	.freeze = pm_generic_freeze,
  90	.thaw = pm_generic_thaw,
  91	.poweroff = pm_generic_poweroff,
  92	.restore = pm_generic_restore,
  93};
  94
  95const struct bus_type mipi_dsi_bus_type = {
  96	.name = "mipi-dsi",
  97	.match = mipi_dsi_device_match,
  98	.uevent = mipi_dsi_uevent,
  99	.pm = &mipi_dsi_device_pm_ops,
 100};
 101EXPORT_SYMBOL_GPL(mipi_dsi_bus_type);
 102
 103/**
 104 * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
 105 *    device tree node
 106 * @np: device tree node
 107 *
 108 * Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no
 109 *    such device exists (or has not been registered yet).
 110 */
 111struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np)
 112{
 113	struct device *dev;
 114
 115	dev = bus_find_device_by_of_node(&mipi_dsi_bus_type, np);
 116
 117	return dev ? to_mipi_dsi_device(dev) : NULL;
 118}
 119EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node);
 120
 121static void mipi_dsi_dev_release(struct device *dev)
 122{
 123	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
 124
 125	of_node_put(dev->of_node);
 126	kfree(dsi);
 127}
 128
 129static const struct device_type mipi_dsi_device_type = {
 130	.release = mipi_dsi_dev_release,
 131};
 132
 133static struct mipi_dsi_device *mipi_dsi_device_alloc(struct mipi_dsi_host *host)
 134{
 135	struct mipi_dsi_device *dsi;
 136
 137	dsi = kzalloc(sizeof(*dsi), GFP_KERNEL);
 138	if (!dsi)
 139		return ERR_PTR(-ENOMEM);
 140
 141	dsi->host = host;
 142	dsi->dev.bus = &mipi_dsi_bus_type;
 143	dsi->dev.parent = host->dev;
 144	dsi->dev.type = &mipi_dsi_device_type;
 145
 146	device_initialize(&dsi->dev);
 147
 148	return dsi;
 149}
 150
 151static int mipi_dsi_device_add(struct mipi_dsi_device *dsi)
 152{
 153	struct mipi_dsi_host *host = dsi->host;
 154
 155	dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev),  dsi->channel);
 156
 157	return device_add(&dsi->dev);
 158}
 159
 160#if IS_ENABLED(CONFIG_OF)
 161static struct mipi_dsi_device *
 162of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
 163{
 164	struct mipi_dsi_device_info info = { };
 165	int ret;
 166	u32 reg;
 167
 168	if (of_alias_from_compatible(node, info.type, sizeof(info.type)) < 0) {
 169		dev_err(host->dev, "modalias failure on %pOF\n", node);
 170		return ERR_PTR(-EINVAL);
 171	}
 172
 173	ret = of_property_read_u32(node, "reg", &reg);
 174	if (ret) {
 175		dev_err(host->dev, "device node %pOF has no valid reg property: %d\n",
 176			node, ret);
 177		return ERR_PTR(-EINVAL);
 178	}
 179
 180	info.channel = reg;
 181	info.node = of_node_get(node);
 182
 183	return mipi_dsi_device_register_full(host, &info);
 184}
 185#else
 186static struct mipi_dsi_device *
 187of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
 188{
 189	return ERR_PTR(-ENODEV);
 190}
 191#endif
 192
 193/**
 194 * mipi_dsi_device_register_full - create a MIPI DSI device
 195 * @host: DSI host to which this device is connected
 196 * @info: pointer to template containing DSI device information
 197 *
 198 * Create a MIPI DSI device by using the device information provided by
 199 * mipi_dsi_device_info template
 200 *
 201 * Returns:
 202 * A pointer to the newly created MIPI DSI device, or, a pointer encoded
 203 * with an error
 204 */
 205struct mipi_dsi_device *
 206mipi_dsi_device_register_full(struct mipi_dsi_host *host,
 207			      const struct mipi_dsi_device_info *info)
 208{
 209	struct mipi_dsi_device *dsi;
 210	int ret;
 211
 212	if (!info) {
 213		dev_err(host->dev, "invalid mipi_dsi_device_info pointer\n");
 214		return ERR_PTR(-EINVAL);
 215	}
 216
 217	if (info->channel > 3) {
 218		dev_err(host->dev, "invalid virtual channel: %u\n", info->channel);
 219		return ERR_PTR(-EINVAL);
 220	}
 221
 222	dsi = mipi_dsi_device_alloc(host);
 223	if (IS_ERR(dsi)) {
 224		dev_err(host->dev, "failed to allocate DSI device %ld\n",
 225			PTR_ERR(dsi));
 226		return dsi;
 227	}
 228
 229	device_set_node(&dsi->dev, of_fwnode_handle(info->node));
 230	dsi->channel = info->channel;
 231	strscpy(dsi->name, info->type, sizeof(dsi->name));
 232
 233	ret = mipi_dsi_device_add(dsi);
 234	if (ret) {
 235		dev_err(host->dev, "failed to add DSI device %d\n", ret);
 236		kfree(dsi);
 237		return ERR_PTR(ret);
 238	}
 239
 240	return dsi;
 241}
 242EXPORT_SYMBOL(mipi_dsi_device_register_full);
 243
 244/**
 245 * mipi_dsi_device_unregister - unregister MIPI DSI device
 246 * @dsi: DSI peripheral device
 247 */
 248void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi)
 249{
 250	device_unregister(&dsi->dev);
 251}
 252EXPORT_SYMBOL(mipi_dsi_device_unregister);
 253
 254static void devm_mipi_dsi_device_unregister(void *arg)
 255{
 256	struct mipi_dsi_device *dsi = arg;
 257
 258	mipi_dsi_device_unregister(dsi);
 259}
 260
 261/**
 262 * devm_mipi_dsi_device_register_full - create a managed MIPI DSI device
 263 * @dev: device to tie the MIPI-DSI device lifetime to
 264 * @host: DSI host to which this device is connected
 265 * @info: pointer to template containing DSI device information
 266 *
 267 * Create a MIPI DSI device by using the device information provided by
 268 * mipi_dsi_device_info template
 269 *
 270 * This is the managed version of mipi_dsi_device_register_full() which
 271 * automatically calls mipi_dsi_device_unregister() when @dev is
 272 * unbound.
 273 *
 274 * Returns:
 275 * A pointer to the newly created MIPI DSI device, or, a pointer encoded
 276 * with an error
 277 */
 278struct mipi_dsi_device *
 279devm_mipi_dsi_device_register_full(struct device *dev,
 280				   struct mipi_dsi_host *host,
 281				   const struct mipi_dsi_device_info *info)
 282{
 283	struct mipi_dsi_device *dsi;
 284	int ret;
 285
 286	dsi = mipi_dsi_device_register_full(host, info);
 287	if (IS_ERR(dsi))
 288		return dsi;
 289
 290	ret = devm_add_action_or_reset(dev,
 291				       devm_mipi_dsi_device_unregister,
 292				       dsi);
 293	if (ret)
 294		return ERR_PTR(ret);
 295
 296	return dsi;
 297}
 298EXPORT_SYMBOL_GPL(devm_mipi_dsi_device_register_full);
 299
 300static DEFINE_MUTEX(host_lock);
 301static LIST_HEAD(host_list);
 302
 303/**
 304 * of_find_mipi_dsi_host_by_node() - find the MIPI DSI host matching a
 305 *				     device tree node
 306 * @node: device tree node
 307 *
 308 * Returns:
 309 * A pointer to the MIPI DSI host corresponding to @node or NULL if no
 310 * such device exists (or has not been registered yet).
 311 */
 312struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node)
 313{
 314	struct mipi_dsi_host *host;
 315
 316	mutex_lock(&host_lock);
 317
 318	list_for_each_entry(host, &host_list, list) {
 319		if (host->dev->of_node == node) {
 320			mutex_unlock(&host_lock);
 321			return host;
 322		}
 323	}
 324
 325	mutex_unlock(&host_lock);
 326
 327	return NULL;
 328}
 329EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node);
 330
 331int mipi_dsi_host_register(struct mipi_dsi_host *host)
 332{
 333	struct device_node *node;
 334
 335	for_each_available_child_of_node(host->dev->of_node, node) {
 336		/* skip nodes without reg property */
 337		if (!of_property_present(node, "reg"))
 338			continue;
 339		of_mipi_dsi_device_add(host, node);
 340	}
 341
 342	mutex_lock(&host_lock);
 343	list_add_tail(&host->list, &host_list);
 344	mutex_unlock(&host_lock);
 345
 346	return 0;
 347}
 348EXPORT_SYMBOL(mipi_dsi_host_register);
 349
 350static int mipi_dsi_remove_device_fn(struct device *dev, void *priv)
 351{
 352	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
 353
 354	if (dsi->attached)
 355		mipi_dsi_detach(dsi);
 356	mipi_dsi_device_unregister(dsi);
 357
 358	return 0;
 359}
 360
 361void mipi_dsi_host_unregister(struct mipi_dsi_host *host)
 362{
 363	device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn);
 364
 365	mutex_lock(&host_lock);
 366	list_del_init(&host->list);
 367	mutex_unlock(&host_lock);
 368}
 369EXPORT_SYMBOL(mipi_dsi_host_unregister);
 370
 371/**
 372 * mipi_dsi_attach - attach a DSI device to its DSI host
 373 * @dsi: DSI peripheral
 374 */
 375int mipi_dsi_attach(struct mipi_dsi_device *dsi)
 376{
 377	const struct mipi_dsi_host_ops *ops = dsi->host->ops;
 378	int ret;
 379
 380	if (!ops || !ops->attach)
 381		return -ENOSYS;
 382
 383	ret = ops->attach(dsi->host, dsi);
 384	if (ret)
 385		return ret;
 386
 387	dsi->attached = true;
 388
 389	return 0;
 390}
 391EXPORT_SYMBOL(mipi_dsi_attach);
 392
 393/**
 394 * mipi_dsi_detach - detach a DSI device from its DSI host
 395 * @dsi: DSI peripheral
 396 */
 397int mipi_dsi_detach(struct mipi_dsi_device *dsi)
 398{
 399	const struct mipi_dsi_host_ops *ops = dsi->host->ops;
 400
 401	if (WARN_ON(!dsi->attached))
 402		return -EINVAL;
 403
 404	if (!ops || !ops->detach)
 405		return -ENOSYS;
 406
 407	dsi->attached = false;
 408
 409	return ops->detach(dsi->host, dsi);
 410}
 411EXPORT_SYMBOL(mipi_dsi_detach);
 412
 413static void devm_mipi_dsi_detach(void *arg)
 414{
 415	struct mipi_dsi_device *dsi = arg;
 416
 417	mipi_dsi_detach(dsi);
 418}
 419
 420/**
 421 * devm_mipi_dsi_attach - Attach a MIPI-DSI device to its DSI Host
 422 * @dev: device to tie the MIPI-DSI device attachment lifetime to
 423 * @dsi: DSI peripheral
 424 *
 425 * This is the managed version of mipi_dsi_attach() which automatically
 426 * calls mipi_dsi_detach() when @dev is unbound.
 427 *
 428 * Returns:
 429 * 0 on success, a negative error code on failure.
 430 */
 431int devm_mipi_dsi_attach(struct device *dev,
 432			 struct mipi_dsi_device *dsi)
 433{
 434	int ret;
 435
 436	ret = mipi_dsi_attach(dsi);
 437	if (ret)
 438		return ret;
 439
 440	ret = devm_add_action_or_reset(dev, devm_mipi_dsi_detach, dsi);
 441	if (ret)
 442		return ret;
 443
 444	return 0;
 445}
 446EXPORT_SYMBOL_GPL(devm_mipi_dsi_attach);
 447
 448static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi,
 449					struct mipi_dsi_msg *msg)
 450{
 451	const struct mipi_dsi_host_ops *ops = dsi->host->ops;
 452
 453	if (!ops || !ops->transfer)
 454		return -ENOSYS;
 455
 456	if (dsi->mode_flags & MIPI_DSI_MODE_LPM)
 457		msg->flags |= MIPI_DSI_MSG_USE_LPM;
 458
 459	return ops->transfer(dsi->host, msg);
 460}
 461
 462/**
 463 * mipi_dsi_packet_format_is_short - check if a packet is of the short format
 464 * @type: MIPI DSI data type of the packet
 465 *
 466 * Return: true if the packet for the given data type is a short packet, false
 467 * otherwise.
 468 */
 469bool mipi_dsi_packet_format_is_short(u8 type)
 470{
 471	switch (type) {
 472	case MIPI_DSI_V_SYNC_START:
 473	case MIPI_DSI_V_SYNC_END:
 474	case MIPI_DSI_H_SYNC_START:
 475	case MIPI_DSI_H_SYNC_END:
 476	case MIPI_DSI_COMPRESSION_MODE:
 477	case MIPI_DSI_END_OF_TRANSMISSION:
 478	case MIPI_DSI_COLOR_MODE_OFF:
 479	case MIPI_DSI_COLOR_MODE_ON:
 480	case MIPI_DSI_SHUTDOWN_PERIPHERAL:
 481	case MIPI_DSI_TURN_ON_PERIPHERAL:
 482	case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
 483	case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
 484	case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
 485	case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
 486	case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
 487	case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
 488	case MIPI_DSI_DCS_SHORT_WRITE:
 489	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
 490	case MIPI_DSI_DCS_READ:
 491	case MIPI_DSI_EXECUTE_QUEUE:
 492	case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
 493		return true;
 494	}
 495
 496	return false;
 497}
 498EXPORT_SYMBOL(mipi_dsi_packet_format_is_short);
 499
 500/**
 501 * mipi_dsi_packet_format_is_long - check if a packet is of the long format
 502 * @type: MIPI DSI data type of the packet
 503 *
 504 * Return: true if the packet for the given data type is a long packet, false
 505 * otherwise.
 506 */
 507bool mipi_dsi_packet_format_is_long(u8 type)
 508{
 509	switch (type) {
 510	case MIPI_DSI_NULL_PACKET:
 511	case MIPI_DSI_BLANKING_PACKET:
 512	case MIPI_DSI_GENERIC_LONG_WRITE:
 513	case MIPI_DSI_DCS_LONG_WRITE:
 514	case MIPI_DSI_PICTURE_PARAMETER_SET:
 515	case MIPI_DSI_COMPRESSED_PIXEL_STREAM:
 516	case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20:
 517	case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24:
 518	case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16:
 519	case MIPI_DSI_PACKED_PIXEL_STREAM_30:
 520	case MIPI_DSI_PACKED_PIXEL_STREAM_36:
 521	case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12:
 522	case MIPI_DSI_PACKED_PIXEL_STREAM_16:
 523	case MIPI_DSI_PACKED_PIXEL_STREAM_18:
 524	case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
 525	case MIPI_DSI_PACKED_PIXEL_STREAM_24:
 526		return true;
 527	}
 528
 529	return false;
 530}
 531EXPORT_SYMBOL(mipi_dsi_packet_format_is_long);
 532
 533/**
 534 * mipi_dsi_create_packet - create a packet from a message according to the
 535 *     DSI protocol
 536 * @packet: pointer to a DSI packet structure
 537 * @msg: message to translate into a packet
 538 *
 539 * Return: 0 on success or a negative error code on failure.
 540 */
 541int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
 542			   const struct mipi_dsi_msg *msg)
 543{
 544	if (!packet || !msg)
 545		return -EINVAL;
 546
 547	/* do some minimum sanity checking */
 548	if (!mipi_dsi_packet_format_is_short(msg->type) &&
 549	    !mipi_dsi_packet_format_is_long(msg->type))
 550		return -EINVAL;
 551
 552	if (msg->channel > 3)
 553		return -EINVAL;
 554
 555	memset(packet, 0, sizeof(*packet));
 556	packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f);
 557
 558	/* TODO: compute ECC if hardware support is not available */
 559
 560	/*
 561	 * Long write packets contain the word count in header bytes 1 and 2.
 562	 * The payload follows the header and is word count bytes long.
 563	 *
 564	 * Short write packets encode up to two parameters in header bytes 1
 565	 * and 2.
 566	 */
 567	if (mipi_dsi_packet_format_is_long(msg->type)) {
 568		packet->header[1] = (msg->tx_len >> 0) & 0xff;
 569		packet->header[2] = (msg->tx_len >> 8) & 0xff;
 570
 571		packet->payload_length = msg->tx_len;
 572		packet->payload = msg->tx_buf;
 573	} else {
 574		const u8 *tx = msg->tx_buf;
 575
 576		packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0;
 577		packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0;
 578	}
 579
 580	packet->size = sizeof(packet->header) + packet->payload_length;
 581
 582	return 0;
 583}
 584EXPORT_SYMBOL(mipi_dsi_create_packet);
 585
 586/**
 587 * mipi_dsi_shutdown_peripheral() - sends a Shutdown Peripheral command
 588 * @dsi: DSI peripheral device
 589 *
 590 * Return: 0 on success or a negative error code on failure.
 591 */
 592int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi)
 593{
 594	struct mipi_dsi_msg msg = {
 595		.channel = dsi->channel,
 596		.type = MIPI_DSI_SHUTDOWN_PERIPHERAL,
 597		.tx_buf = (u8 [2]) { 0, 0 },
 598		.tx_len = 2,
 599	};
 600	int ret = mipi_dsi_device_transfer(dsi, &msg);
 601
 602	return (ret < 0) ? ret : 0;
 603}
 604EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral);
 605
 606/**
 607 * mipi_dsi_turn_on_peripheral() - sends a Turn On Peripheral command
 608 * @dsi: DSI peripheral device
 609 *
 610 * This function is deprecated. Use mipi_dsi_turn_on_peripheral_multi() instead.
 611 *
 612 * Return: 0 on success or a negative error code on failure.
 613 */
 614int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi)
 615{
 616	struct mipi_dsi_msg msg = {
 617		.channel = dsi->channel,
 618		.type = MIPI_DSI_TURN_ON_PERIPHERAL,
 619		.tx_buf = (u8 [2]) { 0, 0 },
 620		.tx_len = 2,
 621	};
 622	int ret = mipi_dsi_device_transfer(dsi, &msg);
 623
 624	return (ret < 0) ? ret : 0;
 625}
 626EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral);
 627
 628/*
 629 * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of
 630 *    the payload in a long packet transmitted from the peripheral back to the
 631 *    host processor
 632 * @dsi: DSI peripheral device
 633 * @value: the maximum size of the payload
 634 *
 635 * Return: 0 on success or a negative error code on failure.
 636 */
 637int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
 638					    u16 value)
 639{
 640	u8 tx[2] = { value & 0xff, value >> 8 };
 641	struct mipi_dsi_msg msg = {
 642		.channel = dsi->channel,
 643		.type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
 644		.tx_len = sizeof(tx),
 645		.tx_buf = tx,
 646	};
 647	int ret = mipi_dsi_device_transfer(dsi, &msg);
 648
 649	return (ret < 0) ? ret : 0;
 650}
 651EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
 652
 653/**
 654 * mipi_dsi_compression_mode_ext() - enable/disable DSC on the peripheral
 655 * @dsi: DSI peripheral device
 656 * @enable: Whether to enable or disable the DSC
 657 * @algo: Selected compression algorithm
 658 * @pps_selector: Select PPS from the table of pre-stored or uploaded PPS entries
 659 *
 660 * Enable or disable Display Stream Compression on the peripheral.
 661 * This function is deprecated. Use mipi_dsi_compression_mode_ext_multi() instead.
 662 *
 663 * Return: 0 on success or a negative error code on failure.
 664 */
 665int mipi_dsi_compression_mode_ext(struct mipi_dsi_device *dsi, bool enable,
 666				  enum mipi_dsi_compression_algo algo,
 667				  unsigned int pps_selector)
 668{
 669	u8 tx[2] = { };
 670	struct mipi_dsi_msg msg = {
 671		.channel = dsi->channel,
 672		.type = MIPI_DSI_COMPRESSION_MODE,
 673		.tx_len = sizeof(tx),
 674		.tx_buf = tx,
 675	};
 676	int ret;
 677
 678	if (algo > 3 || pps_selector > 3)
 679		return -EINVAL;
 680
 681	tx[0] = (enable << 0) |
 682		(algo << 1) |
 683		(pps_selector << 4);
 684
 685	ret = mipi_dsi_device_transfer(dsi, &msg);
 686
 687	return (ret < 0) ? ret : 0;
 688}
 689EXPORT_SYMBOL(mipi_dsi_compression_mode_ext);
 690
 691/**
 692 * mipi_dsi_compression_mode() - enable/disable DSC on the peripheral
 693 * @dsi: DSI peripheral device
 694 * @enable: Whether to enable or disable the DSC
 695 *
 696 * Enable or disable Display Stream Compression on the peripheral using the
 697 * default Picture Parameter Set and VESA DSC 1.1 algorithm.
 698 *
 699 * Return: 0 on success or a negative error code on failure.
 700 */
 701int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable)
 702{
 703	return mipi_dsi_compression_mode_ext(dsi, enable, MIPI_DSI_COMPRESSION_DSC, 0);
 704}
 705EXPORT_SYMBOL(mipi_dsi_compression_mode);
 706
 707/**
 708 * mipi_dsi_picture_parameter_set() - transmit the DSC PPS to the peripheral
 709 * @dsi: DSI peripheral device
 710 * @pps: VESA DSC 1.1 Picture Parameter Set
 711 *
 712 * Transmit the VESA DSC 1.1 Picture Parameter Set to the peripheral.
 713 * This function is deprecated. Use mipi_dsi_picture_parameter_set_multi() instead.
 714 *
 715 * Return: 0 on success or a negative error code on failure.
 716 */
 717int mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
 718				   const struct drm_dsc_picture_parameter_set *pps)
 719{
 720	struct mipi_dsi_msg msg = {
 721		.channel = dsi->channel,
 722		.type = MIPI_DSI_PICTURE_PARAMETER_SET,
 723		.tx_len = sizeof(*pps),
 724		.tx_buf = pps,
 725	};
 726	int ret = mipi_dsi_device_transfer(dsi, &msg);
 727
 728	return (ret < 0) ? ret : 0;
 729}
 730EXPORT_SYMBOL(mipi_dsi_picture_parameter_set);
 731
 732/**
 733 * mipi_dsi_generic_write() - transmit data using a generic write packet
 734 * @dsi: DSI peripheral device
 735 * @payload: buffer containing the payload
 736 * @size: size of payload buffer
 737 *
 738 * This function will automatically choose the right data type depending on
 739 * the payload length.
 740 *
 741 * Return: The number of bytes transmitted on success or a negative error code
 742 * on failure.
 743 */
 744ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
 745			       size_t size)
 746{
 747	struct mipi_dsi_msg msg = {
 748		.channel = dsi->channel,
 749		.tx_buf = payload,
 750		.tx_len = size
 751	};
 752
 753	switch (size) {
 754	case 0:
 755		msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
 756		break;
 757
 758	case 1:
 759		msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
 760		break;
 761
 762	case 2:
 763		msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
 764		break;
 765
 766	default:
 767		msg.type = MIPI_DSI_GENERIC_LONG_WRITE;
 768		break;
 769	}
 770
 771	return mipi_dsi_device_transfer(dsi, &msg);
 772}
 773EXPORT_SYMBOL(mipi_dsi_generic_write);
 774
 775/**
 776 * mipi_dsi_generic_write_multi() - mipi_dsi_generic_write() w/ accum_err
 777 * @ctx: Context for multiple DSI transactions
 778 * @payload: buffer containing the payload
 779 * @size: size of payload buffer
 780 *
 781 * A wrapper around mipi_dsi_generic_write() that deals with errors in a way
 782 * that makes it convenient to make several calls in a row.
 783 */
 784void mipi_dsi_generic_write_multi(struct mipi_dsi_multi_context *ctx,
 785				  const void *payload, size_t size)
 786{
 787	struct mipi_dsi_device *dsi = ctx->dsi;
 788	struct device *dev = &dsi->dev;
 789	ssize_t ret;
 790
 791	if (ctx->accum_err)
 792		return;
 793
 794	ret = mipi_dsi_generic_write(dsi, payload, size);
 795	if (ret < 0) {
 796		ctx->accum_err = ret;
 797		dev_err(dev, "sending generic data %*ph failed: %d\n",
 798			(int)size, payload, ctx->accum_err);
 799	}
 800}
 801EXPORT_SYMBOL(mipi_dsi_generic_write_multi);
 802
 803/**
 804 * mipi_dsi_dual_generic_write_multi() - mipi_dsi_generic_write_multi() for
 805 * two dsi channels, one after the other
 806 * @ctx: Context for multiple DSI transactions
 807 * @dsi1: First dsi channel to write buffer to
 808 * @dsi2: Second dsi channel to write buffer to
 809 * @payload: Buffer containing the payload
 810 * @size: Size of payload buffer
 811 *
 812 * A wrapper around mipi_dsi_generic_write_multi() that allows the user to
 813 * conveniently write to two dsi channels, one after the other.
 814 */
 815void mipi_dsi_dual_generic_write_multi(struct mipi_dsi_multi_context *ctx,
 816				       struct mipi_dsi_device *dsi1,
 817				       struct mipi_dsi_device *dsi2,
 818				       const void *payload, size_t size)
 819{
 820	ctx->dsi = dsi1;
 821	mipi_dsi_generic_write_multi(ctx, payload, size);
 822	ctx->dsi = dsi2;
 823	mipi_dsi_generic_write_multi(ctx, payload, size);
 824}
 825EXPORT_SYMBOL(mipi_dsi_dual_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 */
 841ssize_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}
 871EXPORT_SYMBOL(mipi_dsi_generic_read);
 872
 873/**
 874 * drm_mipi_dsi_get_input_bus_fmt() - Get the required MEDIA_BUS_FMT_* based
 875 *				      input pixel format for a given DSI output
 876 *				      pixel format
 877 * @dsi_format: pixel format that a DSI host needs to output
 878 *
 879 * Various DSI hosts can use this function during their
 880 * &drm_bridge_funcs.atomic_get_input_bus_fmts operation to ascertain
 881 * the MEDIA_BUS_FMT_* pixel format required as input.
 882 *
 883 * RETURNS:
 884 * a 32-bit MEDIA_BUS_FMT_* value on success or 0 in case of failure.
 885 */
 886u32 drm_mipi_dsi_get_input_bus_fmt(enum mipi_dsi_pixel_format dsi_format)
 887{
 888	switch (dsi_format) {
 889	case MIPI_DSI_FMT_RGB888:
 890		return MEDIA_BUS_FMT_RGB888_1X24;
 891
 892	case MIPI_DSI_FMT_RGB666:
 893		return MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
 894
 895	case MIPI_DSI_FMT_RGB666_PACKED:
 896		return MEDIA_BUS_FMT_RGB666_1X18;
 897
 898	case MIPI_DSI_FMT_RGB565:
 899		return MEDIA_BUS_FMT_RGB565_1X16;
 900
 901	default:
 902		/* Unsupported DSI Format */
 903		return 0;
 904	}
 905}
 906EXPORT_SYMBOL(drm_mipi_dsi_get_input_bus_fmt);
 907
 908/**
 909 * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
 910 * @dsi: DSI peripheral device
 911 * @data: buffer containing data to be transmitted
 912 * @len: size of transmission buffer
 913 *
 914 * This function will automatically choose the right data type depending on
 915 * the command payload length.
 916 *
 917 * Return: The number of bytes successfully transmitted or a negative error
 918 * code on failure.
 919 */
 920ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
 921				  const void *data, size_t len)
 922{
 923	struct mipi_dsi_msg msg = {
 924		.channel = dsi->channel,
 925		.tx_buf = data,
 926		.tx_len = len
 927	};
 928
 929	switch (len) {
 930	case 0:
 931		return -EINVAL;
 932
 933	case 1:
 934		msg.type = MIPI_DSI_DCS_SHORT_WRITE;
 935		break;
 936
 937	case 2:
 938		msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
 939		break;
 940
 941	default:
 942		msg.type = MIPI_DSI_DCS_LONG_WRITE;
 943		break;
 944	}
 945
 946	return mipi_dsi_device_transfer(dsi, &msg);
 947}
 948EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer);
 949
 950/**
 951 * mipi_dsi_dcs_write_buffer_chatty - mipi_dsi_dcs_write_buffer() w/ an error log
 952 * @dsi: DSI peripheral device
 953 * @data: buffer containing data to be transmitted
 954 * @len: size of transmission buffer
 955 *
 956 * Like mipi_dsi_dcs_write_buffer() but includes a dev_err()
 957 * call for you and returns 0 upon success, not the number of bytes sent.
 958 *
 959 * Return: 0 on success or a negative error code on failure.
 960 */
 961int mipi_dsi_dcs_write_buffer_chatty(struct mipi_dsi_device *dsi,
 962				     const void *data, size_t len)
 963{
 964	struct device *dev = &dsi->dev;
 965	ssize_t ret;
 966
 967	ret = mipi_dsi_dcs_write_buffer(dsi, data, len);
 968	if (ret < 0) {
 969		dev_err(dev, "sending dcs data %*ph failed: %zd\n",
 970			(int)len, data, ret);
 971		return ret;
 972	}
 973
 974	return 0;
 975}
 976EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer_chatty);
 977
 978/**
 979 * mipi_dsi_dcs_write_buffer_multi - mipi_dsi_dcs_write_buffer_chatty() w/ accum_err
 980 * @ctx: Context for multiple DSI transactions
 981 * @data: buffer containing data to be transmitted
 982 * @len: size of transmission buffer
 983 *
 984 * Like mipi_dsi_dcs_write_buffer_chatty() but deals with errors in a way that
 985 * makes it convenient to make several calls in a row.
 986 */
 987void mipi_dsi_dcs_write_buffer_multi(struct mipi_dsi_multi_context *ctx,
 988				     const void *data, size_t len)
 989{
 990	struct mipi_dsi_device *dsi = ctx->dsi;
 991	struct device *dev = &dsi->dev;
 992	ssize_t ret;
 993
 994	if (ctx->accum_err)
 995		return;
 996
 997	ret = mipi_dsi_dcs_write_buffer(dsi, data, len);
 998	if (ret < 0) {
 999		ctx->accum_err = ret;
1000		dev_err(dev, "sending dcs data %*ph failed: %d\n",
1001			(int)len, data, ctx->accum_err);
1002	}
1003}
1004EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer_multi);
1005
1006/**
1007 * mipi_dsi_dual_dcs_write_buffer_multi - mipi_dsi_dcs_write_buffer_multi() for
1008 * two dsi channels, one after the other
1009 * @ctx: Context for multiple DSI transactions
1010 * @dsi1: First dsi channel to write buffer to
1011 * @dsi2: Second dsi channel to write buffer to
1012 * @data: Buffer containing data to be transmitted
1013 * @len: Size of transmission buffer
1014 *
1015 * A wrapper around mipi_dsi_dcs_write_buffer_multi() that allows the user to
1016 * conveniently write to two dsi channels, one after the other.
1017 */
1018void mipi_dsi_dual_dcs_write_buffer_multi(struct mipi_dsi_multi_context *ctx,
1019					  struct mipi_dsi_device *dsi1,
1020					  struct mipi_dsi_device *dsi2,
1021					  const void *data, size_t len)
1022{
1023	ctx->dsi = dsi1;
1024	mipi_dsi_dcs_write_buffer_multi(ctx, data, len);
1025	ctx->dsi = dsi2;
1026	mipi_dsi_dcs_write_buffer_multi(ctx, data, len);
1027}
1028EXPORT_SYMBOL(mipi_dsi_dual_dcs_write_buffer_multi);
1029
1030/**
1031 * mipi_dsi_dcs_write() - send DCS write command
1032 * @dsi: DSI peripheral device
1033 * @cmd: DCS command
1034 * @data: buffer containing the command payload
1035 * @len: command payload length
1036 *
1037 * This function will automatically choose the right data type depending on
1038 * the command payload length.
1039 *
1040 * Return: The number of bytes successfully transmitted or a negative error
1041 * code on failure.
1042 */
1043ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
1044			   const void *data, size_t len)
1045{
1046	ssize_t err;
1047	size_t size;
1048	u8 stack_tx[8];
1049	u8 *tx;
1050
1051	size = 1 + len;
1052	if (len > ARRAY_SIZE(stack_tx) - 1) {
1053		tx = kmalloc(size, GFP_KERNEL);
1054		if (!tx)
1055			return -ENOMEM;
1056	} else {
1057		tx = stack_tx;
1058	}
1059
1060	/* concatenate the DCS command byte and the payload */
1061	tx[0] = cmd;
1062	if (data)
1063		memcpy(&tx[1], data, len);
1064
1065	err = mipi_dsi_dcs_write_buffer(dsi, tx, size);
1066
1067	if (tx != stack_tx)
1068		kfree(tx);
1069
1070	return err;
1071}
1072EXPORT_SYMBOL(mipi_dsi_dcs_write);
1073
1074/**
1075 * mipi_dsi_dcs_read() - send DCS read request command
1076 * @dsi: DSI peripheral device
1077 * @cmd: DCS command
1078 * @data: buffer in which to receive data
1079 * @len: size of receive buffer
1080 *
1081 * Return: The number of bytes read or a negative error code on failure.
1082 */
1083ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
1084			  size_t len)
1085{
1086	struct mipi_dsi_msg msg = {
1087		.channel = dsi->channel,
1088		.type = MIPI_DSI_DCS_READ,
1089		.tx_buf = &cmd,
1090		.tx_len = 1,
1091		.rx_buf = data,
1092		.rx_len = len
1093	};
1094
1095	return mipi_dsi_device_transfer(dsi, &msg);
1096}
1097EXPORT_SYMBOL(mipi_dsi_dcs_read);
1098
1099/**
1100 * mipi_dsi_dcs_read_multi() - mipi_dsi_dcs_read() w/ accum_err
1101 * @ctx: Context for multiple DSI transactions
1102 * @cmd: DCS command
1103 * @data: buffer in which to receive data
1104 * @len: size of receive buffer
1105 *
1106 * Like mipi_dsi_dcs_read() but deals with errors in a way that makes it
1107 * convenient to make several calls in a row.
1108 */
1109void mipi_dsi_dcs_read_multi(struct mipi_dsi_multi_context *ctx, u8 cmd,
1110			     void *data, size_t len)
1111{
1112	struct mipi_dsi_device *dsi = ctx->dsi;
1113	struct device *dev = &dsi->dev;
1114	struct mipi_dsi_msg msg = {
1115		.channel = dsi->channel,
1116		.type = MIPI_DSI_DCS_READ,
1117		.tx_buf = &cmd,
1118		.tx_len = 1,
1119		.rx_buf = data,
1120		.rx_len = len
1121	};
1122	ssize_t ret;
1123
1124	if (ctx->accum_err)
1125		return;
1126
1127	ret = mipi_dsi_device_transfer(dsi, &msg);
1128	if (ret < 0) {
1129		ctx->accum_err = ret;
1130		dev_err(dev, "dcs read with command %#x failed: %d\n", cmd,
1131			ctx->accum_err);
1132	}
1133}
1134EXPORT_SYMBOL(mipi_dsi_dcs_read_multi);
1135
1136/**
1137 * mipi_dsi_dcs_nop() - send DCS nop packet
1138 * @dsi: DSI peripheral device
1139 *
1140 * This function is deprecated. Use mipi_dsi_dcs_nop_multi() instead.
1141 *
1142 * Return: 0 on success or a negative error code on failure.
1143 */
1144int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi)
1145{
1146	ssize_t err;
1147
1148	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0);
1149	if (err < 0)
1150		return err;
1151
1152	return 0;
1153}
1154EXPORT_SYMBOL(mipi_dsi_dcs_nop);
1155
1156/**
1157 * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
1158 * @dsi: DSI peripheral device
1159 *
1160 * This function is deprecated. Use mipi_dsi_dcs_soft_reset_multi() instead.
1161 *
1162 * Return: 0 on success or a negative error code on failure.
1163 */
1164int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi)
1165{
1166	ssize_t err;
1167
1168	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0);
1169	if (err < 0)
1170		return err;
1171
1172	return 0;
1173}
1174EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset);
1175
1176/**
1177 * mipi_dsi_dcs_get_power_mode() - query the display module's current power
1178 *    mode
1179 * @dsi: DSI peripheral device
1180 * @mode: return location for the current power mode
1181 *
1182 * Return: 0 on success or a negative error code on failure.
1183 */
1184int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
1185{
1186	ssize_t err;
1187
1188	err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode,
1189				sizeof(*mode));
1190	if (err <= 0) {
1191		if (err == 0)
1192			err = -ENODATA;
1193
1194		return err;
1195	}
1196
1197	return 0;
1198}
1199EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);
1200
1201/**
1202 * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
1203 *    data used by the interface
1204 * @dsi: DSI peripheral device
1205 * @format: return location for the pixel format
1206 *
1207 * Return: 0 on success or a negative error code on failure.
1208 */
1209int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format)
1210{
1211	ssize_t err;
1212
1213	err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format,
1214				sizeof(*format));
1215	if (err <= 0) {
1216		if (err == 0)
1217			err = -ENODATA;
1218
1219		return err;
1220	}
1221
1222	return 0;
1223}
1224EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format);
1225
1226/**
1227 * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
1228 *    display module except interface communication
1229 * @dsi: DSI peripheral device
1230 *
1231 * This function is deprecated. Use mipi_dsi_dcs_enter_sleep_mode_multi() instead.
1232 *
1233 * Return: 0 on success or a negative error code on failure.
1234 */
1235int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi)
1236{
1237	ssize_t err;
1238
1239	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
1240	if (err < 0)
1241		return err;
1242
1243	return 0;
1244}
1245EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode);
1246
1247/**
1248 * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
1249 *    module
1250 * @dsi: DSI peripheral device
1251 *
1252 * This function is deprecated. Use mipi_dsi_dcs_exit_sleep_mode_multi() instead.
1253 *
1254 * Return: 0 on success or a negative error code on failure.
1255 */
1256int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi)
1257{
1258	ssize_t err;
1259
1260	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0);
1261	if (err < 0)
1262		return err;
1263
1264	return 0;
1265}
1266EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode);
1267
1268/**
1269 * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
1270 *    display device
1271 * @dsi: DSI peripheral device
1272 *
1273 * This function is deprecated. Use mipi_dsi_dcs_set_display_off_multi() instead.
1274 *
1275 * Return: 0 on success or a negative error code on failure.
1276 */
1277int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi)
1278{
1279	ssize_t err;
1280
1281	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
1282	if (err < 0)
1283		return err;
1284
1285	return 0;
1286}
1287EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off);
1288
1289/**
1290 * mipi_dsi_dcs_set_display_on() - start displaying the image data on the
1291 *    display device
1292 * @dsi: DSI peripheral device
1293 *
1294 * This function is deprecated. Use mipi_dsi_dcs_set_display_on_multi() instead.
1295 *
1296 * Return: 0 on success or a negative error code on failure
1297 */
1298int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi)
1299{
1300	ssize_t err;
1301
1302	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0);
1303	if (err < 0)
1304		return err;
1305
1306	return 0;
1307}
1308EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on);
1309
1310/**
1311 * mipi_dsi_dcs_set_column_address() - define the column extent of the frame
1312 *    memory accessed by the host processor
1313 * @dsi: DSI peripheral device
1314 * @start: first column of frame memory
1315 * @end: last column of frame memory
1316 *
1317 * This function is deprecated. Use mipi_dsi_dcs_set_column_address_multi()
1318 * instead.
1319 *
1320 * Return: 0 on success or a negative error code on failure.
1321 */
1322int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
1323				    u16 end)
1324{
1325	u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
1326	ssize_t err;
1327
1328	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload,
1329				 sizeof(payload));
1330	if (err < 0)
1331		return err;
1332
1333	return 0;
1334}
1335EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address);
1336
1337/**
1338 * mipi_dsi_dcs_set_page_address() - define the page extent of the frame
1339 *    memory accessed by the host processor
1340 * @dsi: DSI peripheral device
1341 * @start: first page of frame memory
1342 * @end: last page of frame memory
1343 *
1344 * This function is deprecated. Use mipi_dsi_dcs_set_page_address_multi()
1345 * instead.
1346 *
1347 * Return: 0 on success or a negative error code on failure.
1348 */
1349int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
1350				  u16 end)
1351{
1352	u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
1353	ssize_t err;
1354
1355	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload,
1356				 sizeof(payload));
1357	if (err < 0)
1358		return err;
1359
1360	return 0;
1361}
1362EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address);
1363
1364/**
1365 * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
1366 *    output signal on the TE signal line.
1367 * @dsi: DSI peripheral device
1368 * @mode: the Tearing Effect Output Line mode
1369 *
1370 * This function is deprecated. Use mipi_dsi_dcs_set_tear_on_multi() instead.
1371 *
1372 * Return: 0 on success or a negative error code on failure
1373 */
1374int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
1375			     enum mipi_dsi_dcs_tear_mode mode)
1376{
1377	u8 value = mode;
1378	ssize_t err;
1379
1380	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value,
1381				 sizeof(value));
1382	if (err < 0)
1383		return err;
1384
1385	return 0;
1386}
1387EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
1388
1389/**
1390 * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
1391 *    data used by the interface
1392 * @dsi: DSI peripheral device
1393 * @format: pixel format
1394 *
1395 * This function is deprecated. Use mipi_dsi_dcs_set_pixel_format_multi()
1396 * instead.
1397 *
1398 * Return: 0 on success or a negative error code on failure.
1399 */
1400int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
1401{
1402	ssize_t err;
1403
1404	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format,
1405				 sizeof(format));
1406	if (err < 0)
1407		return err;
1408
1409	return 0;
1410}
1411EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
1412
1413/**
1414 * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for
1415 *    the Tearing Effect output signal of the display module
1416 * @dsi: DSI peripheral device
1417 * @scanline: scanline to use as trigger
1418 *
1419 * This function is deprecated. Use mipi_dsi_dcs_set_tear_scanline_multi()
1420 * instead.
1421 *
1422 * Return: 0 on success or a negative error code on failure
1423 */
1424int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
1425{
1426	u8 payload[2] = { scanline >> 8, scanline & 0xff };
1427	ssize_t err;
1428
1429	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_SCANLINE, payload,
1430				 sizeof(payload));
1431	if (err < 0)
1432		return err;
1433
1434	return 0;
1435}
1436EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline);
1437
1438/**
1439 * mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the
1440 *    display
1441 * @dsi: DSI peripheral device
1442 * @brightness: brightness value
1443 *
1444 * This function is deprecated. Use mipi_dsi_dcs_set_display_brightness_multi()
1445 * instead.
1446 *
1447 * Return: 0 on success or a negative error code on failure.
1448 */
1449int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
1450					u16 brightness)
1451{
1452	u8 payload[2] = { brightness & 0xff, brightness >> 8 };
1453	ssize_t err;
1454
1455	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
1456				 payload, sizeof(payload));
1457	if (err < 0)
1458		return err;
1459
1460	return 0;
1461}
1462EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness);
1463
1464/**
1465 * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value
1466 *    of the display
1467 * @dsi: DSI peripheral device
1468 * @brightness: brightness value
1469 *
1470 * Return: 0 on success or a negative error code on failure.
1471 */
1472int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
1473					u16 *brightness)
1474{
1475	ssize_t err;
1476
1477	err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
1478				brightness, sizeof(*brightness));
1479	if (err <= 0) {
1480		if (err == 0)
1481			err = -ENODATA;
1482
1483		return err;
1484	}
1485
1486	return 0;
1487}
1488EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness);
1489
1490/**
1491 * mipi_dsi_dcs_set_display_brightness_large() - sets the 16-bit brightness value
1492 *    of the display
1493 * @dsi: DSI peripheral device
1494 * @brightness: brightness value
1495 *
1496 * Return: 0 on success or a negative error code on failure.
1497 */
1498int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi,
1499					     u16 brightness)
1500{
1501	u8 payload[2] = { brightness >> 8, brightness & 0xff };
1502	ssize_t err;
1503
1504	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
1505				 payload, sizeof(payload));
1506	if (err < 0)
1507		return err;
1508
1509	return 0;
1510}
1511EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness_large);
1512
1513/**
1514 * mipi_dsi_dcs_get_display_brightness_large() - gets the current 16-bit
1515 *    brightness value of the display
1516 * @dsi: DSI peripheral device
1517 * @brightness: brightness value
1518 *
1519 * Return: 0 on success or a negative error code on failure.
1520 */
1521int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi,
1522					     u16 *brightness)
1523{
1524	u8 brightness_be[2];
1525	ssize_t err;
1526
1527	err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
1528				brightness_be, sizeof(brightness_be));
1529	if (err <= 0) {
1530		if (err == 0)
1531			err = -ENODATA;
1532
1533		return err;
1534	}
1535
1536	*brightness = (brightness_be[0] << 8) | brightness_be[1];
1537
1538	return 0;
1539}
1540EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness_large);
1541
1542/**
1543 * mipi_dsi_picture_parameter_set_multi() - transmit the DSC PPS to the peripheral
1544 * @ctx: Context for multiple DSI transactions
1545 * @pps: VESA DSC 1.1 Picture Parameter Set
1546 *
1547 * Like mipi_dsi_picture_parameter_set() but deals with errors in a way that
1548 * makes it convenient to make several calls in a row.
1549 */
1550void mipi_dsi_picture_parameter_set_multi(struct mipi_dsi_multi_context *ctx,
1551				   const struct drm_dsc_picture_parameter_set *pps)
1552{
1553	struct mipi_dsi_device *dsi = ctx->dsi;
1554	struct device *dev = &dsi->dev;
1555	ssize_t ret;
1556
1557	if (ctx->accum_err)
1558		return;
1559
1560	ret = mipi_dsi_picture_parameter_set(dsi, pps);
1561	if (ret < 0) {
1562		ctx->accum_err = ret;
1563		dev_err(dev, "sending PPS failed: %d\n",
1564			ctx->accum_err);
1565	}
1566}
1567EXPORT_SYMBOL(mipi_dsi_picture_parameter_set_multi);
1568
1569/**
1570 * mipi_dsi_compression_mode_ext_multi() - enable/disable DSC on the peripheral
1571 * @ctx: Context for multiple DSI transactions
1572 * @enable: Whether to enable or disable the DSC
1573 * @algo: Selected compression algorithm
1574 * @pps_selector: Select PPS from the table of pre-stored or uploaded PPS entries
1575 *
1576 * Like mipi_dsi_compression_mode_ext() but deals with errors in a way that
1577 * makes it convenient to make several calls in a row.
1578 */
1579void mipi_dsi_compression_mode_ext_multi(struct mipi_dsi_multi_context *ctx,
1580					 bool enable,
1581					 enum mipi_dsi_compression_algo algo,
1582					 unsigned int pps_selector)
1583{
1584	struct mipi_dsi_device *dsi = ctx->dsi;
1585	struct device *dev = &dsi->dev;
1586	ssize_t ret;
1587
1588	if (ctx->accum_err)
1589		return;
1590
1591	ret = mipi_dsi_compression_mode_ext(dsi, enable, algo, pps_selector);
1592	if (ret < 0) {
1593		ctx->accum_err = ret;
1594		dev_err(dev, "sending COMPRESSION_MODE failed: %d\n",
1595			ctx->accum_err);
1596	}
1597}
1598EXPORT_SYMBOL(mipi_dsi_compression_mode_ext_multi);
1599
1600/**
1601 * mipi_dsi_compression_mode_multi() - enable/disable DSC on the peripheral
1602 * @ctx: Context for multiple DSI transactions
1603 * @enable: Whether to enable or disable the DSC
1604 *
1605 * Enable or disable Display Stream Compression on the peripheral using the
1606 * default Picture Parameter Set and VESA DSC 1.1 algorithm.
1607 */
1608void mipi_dsi_compression_mode_multi(struct mipi_dsi_multi_context *ctx,
1609				     bool enable)
1610{
1611	return mipi_dsi_compression_mode_ext_multi(ctx, enable,
1612						   MIPI_DSI_COMPRESSION_DSC, 0);
1613}
1614EXPORT_SYMBOL(mipi_dsi_compression_mode_multi);
1615
1616/**
1617 * mipi_dsi_dcs_nop_multi() - send DCS NOP packet
1618 * @ctx: Context for multiple DSI transactions
1619 *
1620 * Like mipi_dsi_dcs_nop() but deals with errors in a way that
1621 * makes it convenient to make several calls in a row.
1622 */
1623void mipi_dsi_dcs_nop_multi(struct mipi_dsi_multi_context *ctx)
1624{
1625	struct mipi_dsi_device *dsi = ctx->dsi;
1626	struct device *dev = &dsi->dev;
1627	ssize_t ret;
1628
1629	if (ctx->accum_err)
1630		return;
1631
1632	ret = mipi_dsi_dcs_nop(dsi);
1633	if (ret < 0) {
1634		ctx->accum_err = ret;
1635		dev_err(dev, "sending DCS NOP failed: %d\n",
1636			ctx->accum_err);
1637	}
1638}
1639EXPORT_SYMBOL(mipi_dsi_dcs_nop_multi);
1640
1641/**
1642 * mipi_dsi_dcs_enter_sleep_mode_multi() - send DCS ENTER_SLEEP_MODE  packet
1643 * @ctx: Context for multiple DSI transactions
1644 *
1645 * Like mipi_dsi_dcs_enter_sleep_mode() but deals with errors in a way that
1646 * makes it convenient to make several calls in a row.
1647 */
1648void mipi_dsi_dcs_enter_sleep_mode_multi(struct mipi_dsi_multi_context *ctx)
1649{
1650	struct mipi_dsi_device *dsi = ctx->dsi;
1651	struct device *dev = &dsi->dev;
1652	ssize_t ret;
1653
1654	if (ctx->accum_err)
1655		return;
1656
1657	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
1658	if (ret < 0) {
1659		ctx->accum_err = ret;
1660		dev_err(dev, "sending DCS ENTER_SLEEP_MODE failed: %d\n",
1661			ctx->accum_err);
1662	}
1663}
1664EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode_multi);
1665
1666/**
1667 * mipi_dsi_dcs_exit_sleep_mode_multi() - send DCS EXIT_SLEEP_MODE packet
1668 * @ctx: Context for multiple DSI transactions
1669 *
1670 * Like mipi_dsi_dcs_exit_sleep_mode() but deals with errors in a way that
1671 * makes it convenient to make several calls in a row.
1672 */
1673void mipi_dsi_dcs_exit_sleep_mode_multi(struct mipi_dsi_multi_context *ctx)
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_exit_sleep_mode(dsi);
1683	if (ret < 0) {
1684		ctx->accum_err = ret;
1685		dev_err(dev, "sending DCS EXIT_SLEEP_MODE failed: %d\n",
1686			ctx->accum_err);
1687	}
1688}
1689EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode_multi);
1690
1691/**
1692 * mipi_dsi_dcs_set_display_off_multi() - send DCS SET_DISPLAY_OFF packet
1693 * @ctx: Context for multiple DSI transactions
1694 *
1695 * Like mipi_dsi_dcs_set_display_off() but deals with errors in a way that
1696 * makes it convenient to make several calls in a row.
1697 */
1698void mipi_dsi_dcs_set_display_off_multi(struct mipi_dsi_multi_context *ctx)
1699{
1700	struct mipi_dsi_device *dsi = ctx->dsi;
1701	struct device *dev = &dsi->dev;
1702	ssize_t ret;
1703
1704	if (ctx->accum_err)
1705		return;
1706
1707	ret = mipi_dsi_dcs_set_display_off(dsi);
1708	if (ret < 0) {
1709		ctx->accum_err = ret;
1710		dev_err(dev, "sending DCS SET_DISPLAY_OFF failed: %d\n",
1711			ctx->accum_err);
1712	}
1713}
1714EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off_multi);
1715
1716/**
1717 * mipi_dsi_dcs_set_display_on_multi() - send DCS SET_DISPLAY_ON packet
1718 * @ctx: Context for multiple DSI transactions
1719 *
1720 * Like mipi_dsi_dcs_set_display_on() but deals with errors in a way that
1721 * makes it convenient to make several calls in a row.
1722 */
1723void mipi_dsi_dcs_set_display_on_multi(struct mipi_dsi_multi_context *ctx)
1724{
1725	struct mipi_dsi_device *dsi = ctx->dsi;
1726	struct device *dev = &dsi->dev;
1727	ssize_t ret;
1728
1729	if (ctx->accum_err)
1730		return;
1731
1732	ret = mipi_dsi_dcs_set_display_on(dsi);
1733	if (ret < 0) {
1734		ctx->accum_err = ret;
1735		dev_err(dev, "sending DCS SET_DISPLAY_ON failed: %d\n",
1736			ctx->accum_err);
1737	}
1738}
1739EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on_multi);
1740
1741/**
1742 * mipi_dsi_dcs_set_tear_on_multi() - send DCS SET_TEAR_ON packet
1743 * @ctx: Context for multiple DSI transactions
1744 * @mode: the Tearing Effect Output Line mode
1745 *
1746 * Like mipi_dsi_dcs_set_tear_on() but deals with errors in a way that
1747 * makes it convenient to make several calls in a row.
1748 */
1749void mipi_dsi_dcs_set_tear_on_multi(struct mipi_dsi_multi_context *ctx,
1750				    enum mipi_dsi_dcs_tear_mode mode)
1751{
1752	struct mipi_dsi_device *dsi = ctx->dsi;
1753	struct device *dev = &dsi->dev;
1754	ssize_t ret;
1755
1756	if (ctx->accum_err)
1757		return;
1758
1759	ret = mipi_dsi_dcs_set_tear_on(dsi, mode);
1760	if (ret < 0) {
1761		ctx->accum_err = ret;
1762		dev_err(dev, "sending DCS SET_TEAR_ON failed: %d\n",
1763			ctx->accum_err);
1764	}
1765}
1766EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on_multi);
1767
1768/**
1769 * mipi_dsi_turn_on_peripheral_multi() - sends a Turn On Peripheral command
1770 * @ctx: Context for multiple DSI transactions
1771 *
1772 * Like mipi_dsi_turn_on_peripheral() but deals with errors in a way that
1773 * makes it convenient to make several calls in a row.
1774 */
1775void mipi_dsi_turn_on_peripheral_multi(struct mipi_dsi_multi_context *ctx)
1776{
1777	struct mipi_dsi_device *dsi = ctx->dsi;
1778	struct device *dev = &dsi->dev;
1779	int ret;
1780
1781	if (ctx->accum_err)
1782		return;
1783
1784	ret = mipi_dsi_turn_on_peripheral(dsi);
1785	if (ret < 0) {
1786		ctx->accum_err = ret;
1787		dev_err(dev, "Failed to turn on peripheral: %d\n",
1788			ctx->accum_err);
1789	}
1790}
1791EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral_multi);
1792
1793/**
1794 * mipi_dsi_dcs_set_tear_off_multi() - turn off the display module's Tearing Effect
1795 *    output signal on the TE signal line
1796 * @ctx: Context for multiple DSI transactions
1797 */
1798void mipi_dsi_dcs_set_tear_off_multi(struct mipi_dsi_multi_context *ctx)
1799{
1800	struct mipi_dsi_device *dsi = ctx->dsi;
1801	struct device *dev = &dsi->dev;
1802	ssize_t err;
1803
1804	if (ctx->accum_err)
1805		return;
1806
1807	err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0);
1808	if (err < 0) {
1809		ctx->accum_err = err;
1810		dev_err(dev, "Failed to set tear off: %d\n",
1811			ctx->accum_err);
1812	}
1813}
1814EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off_multi);
1815
1816/**
1817 * mipi_dsi_dcs_soft_reset_multi() - perform a software reset of the display module
1818 * @ctx: Context for multiple DSI transactions
1819 *
1820 * Like mipi_dsi_dcs_soft_reset() but deals with errors in a way that
1821 * makes it convenient to make several calls in a row.
1822 */
1823void mipi_dsi_dcs_soft_reset_multi(struct mipi_dsi_multi_context *ctx)
1824{
1825	struct mipi_dsi_device *dsi = ctx->dsi;
1826	struct device *dev = &dsi->dev;
1827	int ret;
1828
1829	if (ctx->accum_err)
1830		return;
1831
1832	ret = mipi_dsi_dcs_soft_reset(dsi);
1833	if (ret < 0) {
1834		ctx->accum_err = ret;
1835		dev_err(dev, "Failed to mipi_dsi_dcs_soft_reset: %d\n",
1836			ctx->accum_err);
1837	}
1838}
1839EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset_multi);
1840
1841/**
1842 * mipi_dsi_dcs_set_display_brightness_multi() - sets the brightness value of
1843 *	the display
1844 * @ctx: Context for multiple DSI transactions
1845 * @brightness: brightness value
1846 *
1847 * Like mipi_dsi_dcs_set_display_brightness() but deals with errors in a way that
1848 * makes it convenient to make several calls in a row.
1849 */
1850void mipi_dsi_dcs_set_display_brightness_multi(struct mipi_dsi_multi_context *ctx,
1851					       u16 brightness)
1852{
1853	struct mipi_dsi_device *dsi = ctx->dsi;
1854	struct device *dev = &dsi->dev;
1855	int ret;
1856
1857	if (ctx->accum_err)
1858		return;
1859
1860	ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
1861	if (ret < 0) {
1862		ctx->accum_err = ret;
1863		dev_err(dev, "Failed to write display brightness: %d\n",
1864			ctx->accum_err);
1865	}
1866}
1867EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness_multi);
1868
1869/**
1870 * mipi_dsi_dcs_set_pixel_format_multi() - sets the pixel format for the RGB image
1871 *	data used by the interface
1872 * @ctx: Context for multiple DSI transactions
1873 * @format: pixel format
1874 *
1875 * Like mipi_dsi_dcs_set_pixel_format() but deals with errors in a way that
1876 * makes it convenient to make several calls in a row.
1877 */
1878void mipi_dsi_dcs_set_pixel_format_multi(struct mipi_dsi_multi_context *ctx,
1879					 u8 format)
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_pixel_format(dsi, format);
1889	if (ret < 0) {
1890		ctx->accum_err = ret;
1891		dev_err(dev, "Failed to set pixel format: %d\n",
1892			ctx->accum_err);
1893	}
1894}
1895EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format_multi);
1896
1897/**
1898 * mipi_dsi_dcs_set_column_address_multi() - define the column extent of the
1899 *	frame memory accessed by the host processor
1900 * @ctx: Context for multiple DSI transactions
1901 * @start: first column of frame memory
1902 * @end: last column of frame memory
1903 *
1904 * Like mipi_dsi_dcs_set_column_address() but deals with errors in a way that
1905 * makes it convenient to make several calls in a row.
1906 */
1907void mipi_dsi_dcs_set_column_address_multi(struct mipi_dsi_multi_context *ctx,
1908					   u16 start, u16 end)
1909{
1910	struct mipi_dsi_device *dsi = ctx->dsi;
1911	struct device *dev = &dsi->dev;
1912	int ret;
1913
1914	if (ctx->accum_err)
1915		return;
1916
1917	ret = mipi_dsi_dcs_set_column_address(dsi, start, end);
1918	if (ret < 0) {
1919		ctx->accum_err = ret;
1920		dev_err(dev, "Failed to set column address: %d\n",
1921			ctx->accum_err);
1922	}
1923}
1924EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address_multi);
1925
1926/**
1927 * mipi_dsi_dcs_set_page_address_multi() - define the page extent of the
1928 *	frame memory accessed by the host processor
1929 * @ctx: Context for multiple DSI transactions
1930 * @start: first page of frame memory
1931 * @end: last page of frame memory
1932 *
1933 * Like mipi_dsi_dcs_set_page_address() but deals with errors in a way that
1934 * makes it convenient to make several calls in a row.
1935 */
1936void mipi_dsi_dcs_set_page_address_multi(struct mipi_dsi_multi_context *ctx,
1937					 u16 start, u16 end)
1938{
1939	struct mipi_dsi_device *dsi = ctx->dsi;
1940	struct device *dev = &dsi->dev;
1941	int ret;
1942
1943	if (ctx->accum_err)
1944		return;
1945
1946	ret = mipi_dsi_dcs_set_page_address(dsi, start, end);
1947	if (ret < 0) {
1948		ctx->accum_err = ret;
1949		dev_err(dev, "Failed to set page address: %d\n",
1950			ctx->accum_err);
1951	}
1952}
1953EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address_multi);
1954
1955/**
1956 * mipi_dsi_dcs_set_tear_scanline_multi() - set the scanline to use as trigger for
1957 *    the Tearing Effect output signal of the display module
1958 * @ctx: Context for multiple DSI transactions
1959 * @scanline: scanline to use as trigger
1960 *
1961 * Like mipi_dsi_dcs_set_tear_scanline() but deals with errors in a way that
1962 * makes it convenient to make several calls in a row.
1963 */
1964void mipi_dsi_dcs_set_tear_scanline_multi(struct mipi_dsi_multi_context *ctx,
1965					  u16 scanline)
1966{
1967	struct mipi_dsi_device *dsi = ctx->dsi;
1968	struct device *dev = &dsi->dev;
1969	int ret;
1970
1971	if (ctx->accum_err)
1972		return;
1973
1974	ret = mipi_dsi_dcs_set_tear_scanline(dsi, scanline);
1975	if (ret < 0) {
1976		ctx->accum_err = ret;
1977		dev_err(dev, "Failed to set tear scanline: %d\n",
1978			ctx->accum_err);
1979	}
1980}
1981EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline_multi);
1982
1983static int mipi_dsi_drv_probe(struct device *dev)
1984{
1985	struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1986	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1987
1988	return drv->probe(dsi);
1989}
1990
1991static int mipi_dsi_drv_remove(struct device *dev)
1992{
1993	struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1994	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1995
1996	drv->remove(dsi);
1997
1998	return 0;
1999}
2000
2001static void mipi_dsi_drv_shutdown(struct device *dev)
2002{
2003	struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
2004	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
2005
2006	drv->shutdown(dsi);
2007}
2008
2009/**
2010 * mipi_dsi_driver_register_full() - register a driver for DSI devices
2011 * @drv: DSI driver structure
2012 * @owner: owner module
2013 *
2014 * Return: 0 on success or a negative error code on failure.
2015 */
2016int mipi_dsi_driver_register_full(struct mipi_dsi_driver *drv,
2017				  struct module *owner)
2018{
2019	drv->driver.bus = &mipi_dsi_bus_type;
2020	drv->driver.owner = owner;
2021
2022	if (drv->probe)
2023		drv->driver.probe = mipi_dsi_drv_probe;
2024	if (drv->remove)
2025		drv->driver.remove = mipi_dsi_drv_remove;
2026	if (drv->shutdown)
2027		drv->driver.shutdown = mipi_dsi_drv_shutdown;
2028
2029	return driver_register(&drv->driver);
2030}
2031EXPORT_SYMBOL(mipi_dsi_driver_register_full);
2032
2033/**
2034 * mipi_dsi_driver_unregister() - unregister a driver for DSI devices
2035 * @drv: DSI driver structure
2036 *
2037 * Return: 0 on success or a negative error code on failure.
2038 */
2039void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv)
2040{
2041	driver_unregister(&drv->driver);
2042}
2043EXPORT_SYMBOL(mipi_dsi_driver_unregister);
2044
2045static int __init mipi_dsi_bus_init(void)
2046{
2047	return bus_register(&mipi_dsi_bus_type);
2048}
2049postcore_initcall(mipi_dsi_bus_init);
2050
2051MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
2052MODULE_DESCRIPTION("MIPI DSI Bus");
2053MODULE_LICENSE("GPL and additional rights");