drivers/gpu/drm/drm_mipi

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This source file includes following definitions.
mipi_dsi_device_match
mipi_dsi_uevent
of_find_mipi_dsi_device_by_node
mipi_dsi_dev_release
mipi_dsi_device_alloc
mipi_dsi_device_add
of_mipi_dsi_device_add
of_mipi_dsi_device_add
mipi_dsi_device_register_full
mipi_dsi_device_unregister
of_find_mipi_dsi_host_by_node
mipi_dsi_host_register
mipi_dsi_remove_device_fn
mipi_dsi_host_unregister
mipi_dsi_attach
mipi_dsi_detach
mipi_dsi_device_transfer
mipi_dsi_packet_format_is_short
mipi_dsi_packet_format_is_long
mipi_dsi_create_packet
mipi_dsi_shutdown_peripheral
mipi_dsi_turn_on_peripheral
mipi_dsi_set_maximum_return_packet_size
mipi_dsi_generic_write
mipi_dsi_generic_read
mipi_dsi_dcs_write_buffer
mipi_dsi_dcs_write
mipi_dsi_dcs_read
mipi_dsi_dcs_nop
mipi_dsi_dcs_soft_reset
mipi_dsi_dcs_get_power_mode
mipi_dsi_dcs_get_pixel_format
mipi_dsi_dcs_enter_sleep_mode
mipi_dsi_dcs_exit_sleep_mode
mipi_dsi_dcs_set_display_off
mipi_dsi_dcs_set_display_on
mipi_dsi_dcs_set_column_address
mipi_dsi_dcs_set_page_address
mipi_dsi_dcs_set_tear_off
mipi_dsi_dcs_set_tear_on
mipi_dsi_dcs_set_pixel_format
mipi_dsi_dcs_set_tear_scanline
mipi_dsi_dcs_set_display_brightness
mipi_dsi_dcs_get_display_brightness
mipi_dsi_drv_probe
mipi_dsi_drv_remove
mipi_dsi_drv_shutdown
mipi_dsi_driver_register_full
mipi_dsi_driver_unregister
mipi_dsi_bus_init
   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 <drm/drm_mipi_dsi.h>
  29 
  30 #include <linux/device.h>
  31 #include <linux/module.h>
  32 #include <linux/of_device.h>
  33 #include <linux/pm_runtime.h>
  34 #include <linux/slab.h>
  35 
  36 #include <video/mipi_display.h>
  37 
  38 /**
  39  * DOC: dsi helpers
  40  *
  41  * These functions contain some common logic and helpers to deal with MIPI DSI
  42  * peripherals.
  43  *
  44  * Helpers are provided for a number of standard MIPI DSI command as well as a
  45  * subset of the MIPI DCS command set.
  46  */
  47 
  48 static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv)
  49 {
  50         struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
  51 
  52         /* attempt OF style match */
  53         if (of_driver_match_device(dev, drv))
  54                 return 1;
  55 
  56         /* compare DSI device and driver names */
  57         if (!strcmp(dsi->name, drv->name))
  58                 return 1;
  59 
  60         return 0;
  61 }
  62 
  63 static int mipi_dsi_uevent(struct device *dev, struct kobj_uevent_env *env)
  64 {
  65         struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
  66         int err;
  67 
  68         err = of_device_uevent_modalias(dev, env);
  69         if (err != -ENODEV)
  70                 return err;
  71 
  72         add_uevent_var(env, "MODALIAS=%s%s", MIPI_DSI_MODULE_PREFIX,
  73                        dsi->name);
  74 
  75         return 0;
  76 }
  77 
  78 static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
  79         .runtime_suspend = pm_generic_runtime_suspend,
  80         .runtime_resume = pm_generic_runtime_resume,
  81         .suspend = pm_generic_suspend,
  82         .resume = pm_generic_resume,
  83         .freeze = pm_generic_freeze,
  84         .thaw = pm_generic_thaw,
  85         .poweroff = pm_generic_poweroff,
  86         .restore = pm_generic_restore,
  87 };
  88 
  89 static struct bus_type mipi_dsi_bus_type = {
  90         .name = "mipi-dsi",
  91         .match = mipi_dsi_device_match,
  92         .uevent = mipi_dsi_uevent,
  93         .pm = &mipi_dsi_device_pm_ops,
  94 };
  95 
  96 /**
  97  * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
  98  *    device tree node
  99  * @np: device tree node
 100  *
 101  * Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no
 102  *    such device exists (or has not been registered yet).
 103  */
 104 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np)
 105 {
 106         struct device *dev;
 107 
 108         dev = bus_find_device_by_of_node(&mipi_dsi_bus_type, np);
 109 
 110         return dev ? to_mipi_dsi_device(dev) : NULL;
 111 }
 112 EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node);
 113 
 114 static void mipi_dsi_dev_release(struct device *dev)
 115 {
 116         struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
 117 
 118         of_node_put(dev->of_node);
 119         kfree(dsi);
 120 }
 121 
 122 static const struct device_type mipi_dsi_device_type = {
 123         .release = mipi_dsi_dev_release,
 124 };
 125 
 126 static struct mipi_dsi_device *mipi_dsi_device_alloc(struct mipi_dsi_host *host)
 127 {
 128         struct mipi_dsi_device *dsi;
 129 
 130         dsi = kzalloc(sizeof(*dsi), GFP_KERNEL);
 131         if (!dsi)
 132                 return ERR_PTR(-ENOMEM);
 133 
 134         dsi->host = host;
 135         dsi->dev.bus = &mipi_dsi_bus_type;
 136         dsi->dev.parent = host->dev;
 137         dsi->dev.type = &mipi_dsi_device_type;
 138 
 139         device_initialize(&dsi->dev);
 140 
 141         return dsi;
 142 }
 143 
 144 static int mipi_dsi_device_add(struct mipi_dsi_device *dsi)
 145 {
 146         struct mipi_dsi_host *host = dsi->host;
 147 
 148         dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev),  dsi->channel);
 149 
 150         return device_add(&dsi->dev);
 151 }
 152 
 153 #if IS_ENABLED(CONFIG_OF)
 154 static struct mipi_dsi_device *
 155 of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
 156 {
 157         struct device *dev = host->dev;
 158         struct mipi_dsi_device_info info = { };
 159         int ret;
 160         u32 reg;
 161 
 162         if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
 163                 dev_err(dev, "modalias failure on %pOF\n", node);
 164                 return ERR_PTR(-EINVAL);
 165         }
 166 
 167         ret = of_property_read_u32(node, "reg", &reg);
 168         if (ret) {
 169                 dev_err(dev, "device node %pOF has no valid reg property: %d\n",
 170                         node, ret);
 171                 return ERR_PTR(-EINVAL);
 172         }
 173 
 174         info.channel = reg;
 175         info.node = of_node_get(node);
 176 
 177         return mipi_dsi_device_register_full(host, &info);
 178 }
 179 #else
 180 static struct mipi_dsi_device *
 181 of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
 182 {
 183         return ERR_PTR(-ENODEV);
 184 }
 185 #endif
 186 
 187 /**
 188  * mipi_dsi_device_register_full - create a MIPI DSI device
 189  * @host: DSI host to which this device is connected
 190  * @info: pointer to template containing DSI device information
 191  *
 192  * Create a MIPI DSI device by using the device information provided by
 193  * mipi_dsi_device_info template
 194  *
 195  * Returns:
 196  * A pointer to the newly created MIPI DSI device, or, a pointer encoded
 197  * with an error
 198  */
 199 struct mipi_dsi_device *
 200 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
 201                               const struct mipi_dsi_device_info *info)
 202 {
 203         struct mipi_dsi_device *dsi;
 204         struct device *dev = host->dev;
 205         int ret;
 206 
 207         if (!info) {
 208                 dev_err(dev, "invalid mipi_dsi_device_info pointer\n");
 209                 return ERR_PTR(-EINVAL);
 210         }
 211 
 212         if (info->channel > 3) {
 213                 dev_err(dev, "invalid virtual channel: %u\n", info->channel);
 214                 return ERR_PTR(-EINVAL);
 215         }
 216 
 217         dsi = mipi_dsi_device_alloc(host);
 218         if (IS_ERR(dsi)) {
 219                 dev_err(dev, "failed to allocate DSI device %ld\n",
 220                         PTR_ERR(dsi));
 221                 return dsi;
 222         }
 223 
 224         dsi->dev.of_node = info->node;
 225         dsi->channel = info->channel;
 226         strlcpy(dsi->name, info->type, sizeof(dsi->name));
 227 
 228         ret = mipi_dsi_device_add(dsi);
 229         if (ret) {
 230                 dev_err(dev, "failed to add DSI device %d\n", ret);
 231                 kfree(dsi);
 232                 return ERR_PTR(ret);
 233         }
 234 
 235         return dsi;
 236 }
 237 EXPORT_SYMBOL(mipi_dsi_device_register_full);
 238 
 239 /**
 240  * mipi_dsi_device_unregister - unregister MIPI DSI device
 241  * @dsi: DSI peripheral device
 242  */
 243 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi)
 244 {
 245         device_unregister(&dsi->dev);
 246 }
 247 EXPORT_SYMBOL(mipi_dsi_device_unregister);
 248 
 249 static DEFINE_MUTEX(host_lock);
 250 static LIST_HEAD(host_list);
 251 
 252 /**
 253  * of_find_mipi_dsi_host_by_node() - find the MIPI DSI host matching a
 254  *                                   device tree node
 255  * @node: device tree node
 256  *
 257  * Returns:
 258  * A pointer to the MIPI DSI host corresponding to @node or NULL if no
 259  * such device exists (or has not been registered yet).
 260  */
 261 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node)
 262 {
 263         struct mipi_dsi_host *host;
 264 
 265         mutex_lock(&host_lock);
 266 
 267         list_for_each_entry(host, &host_list, list) {
 268                 if (host->dev->of_node == node) {
 269                         mutex_unlock(&host_lock);
 270                         return host;
 271                 }
 272         }
 273 
 274         mutex_unlock(&host_lock);
 275 
 276         return NULL;
 277 }
 278 EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node);
 279 
 280 int mipi_dsi_host_register(struct mipi_dsi_host *host)
 281 {
 282         struct device_node *node;
 283 
 284         for_each_available_child_of_node(host->dev->of_node, node) {
 285                 /* skip nodes without reg property */
 286                 if (!of_find_property(node, "reg", NULL))
 287                         continue;
 288                 of_mipi_dsi_device_add(host, node);
 289         }
 290 
 291         mutex_lock(&host_lock);
 292         list_add_tail(&host->list, &host_list);
 293         mutex_unlock(&host_lock);
 294 
 295         return 0;
 296 }
 297 EXPORT_SYMBOL(mipi_dsi_host_register);
 298 
 299 static int mipi_dsi_remove_device_fn(struct device *dev, void *priv)
 300 {
 301         struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
 302 
 303         mipi_dsi_device_unregister(dsi);
 304 
 305         return 0;
 306 }
 307 
 308 void mipi_dsi_host_unregister(struct mipi_dsi_host *host)
 309 {
 310         device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn);
 311 
 312         mutex_lock(&host_lock);
 313         list_del_init(&host->list);
 314         mutex_unlock(&host_lock);
 315 }
 316 EXPORT_SYMBOL(mipi_dsi_host_unregister);
 317 
 318 /**
 319  * mipi_dsi_attach - attach a DSI device to its DSI host
 320  * @dsi: DSI peripheral
 321  */
 322 int mipi_dsi_attach(struct mipi_dsi_device *dsi)
 323 {
 324         const struct mipi_dsi_host_ops *ops = dsi->host->ops;
 325 
 326         if (!ops || !ops->attach)
 327                 return -ENOSYS;
 328 
 329         return ops->attach(dsi->host, dsi);
 330 }
 331 EXPORT_SYMBOL(mipi_dsi_attach);
 332 
 333 /**
 334  * mipi_dsi_detach - detach a DSI device from its DSI host
 335  * @dsi: DSI peripheral
 336  */
 337 int mipi_dsi_detach(struct mipi_dsi_device *dsi)
 338 {
 339         const struct mipi_dsi_host_ops *ops = dsi->host->ops;
 340 
 341         if (!ops || !ops->detach)
 342                 return -ENOSYS;
 343 
 344         return ops->detach(dsi->host, dsi);
 345 }
 346 EXPORT_SYMBOL(mipi_dsi_detach);
 347 
 348 static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi,
 349                                         struct mipi_dsi_msg *msg)
 350 {
 351         const struct mipi_dsi_host_ops *ops = dsi->host->ops;
 352 
 353         if (!ops || !ops->transfer)
 354                 return -ENOSYS;
 355 
 356         if (dsi->mode_flags & MIPI_DSI_MODE_LPM)
 357                 msg->flags |= MIPI_DSI_MSG_USE_LPM;
 358 
 359         return ops->transfer(dsi->host, msg);
 360 }
 361 
 362 /**
 363  * mipi_dsi_packet_format_is_short - check if a packet is of the short format
 364  * @type: MIPI DSI data type of the packet
 365  *
 366  * Return: true if the packet for the given data type is a short packet, false
 367  * otherwise.
 368  */
 369 bool mipi_dsi_packet_format_is_short(u8 type)
 370 {
 371         switch (type) {
 372         case MIPI_DSI_V_SYNC_START:
 373         case MIPI_DSI_V_SYNC_END:
 374         case MIPI_DSI_H_SYNC_START:
 375         case MIPI_DSI_H_SYNC_END:
 376         case MIPI_DSI_END_OF_TRANSMISSION:
 377         case MIPI_DSI_COLOR_MODE_OFF:
 378         case MIPI_DSI_COLOR_MODE_ON:
 379         case MIPI_DSI_SHUTDOWN_PERIPHERAL:
 380         case MIPI_DSI_TURN_ON_PERIPHERAL:
 381         case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
 382         case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
 383         case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
 384         case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
 385         case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
 386         case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
 387         case MIPI_DSI_DCS_SHORT_WRITE:
 388         case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
 389         case MIPI_DSI_DCS_READ:
 390         case MIPI_DSI_DCS_COMPRESSION_MODE:
 391         case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
 392                 return true;
 393         }
 394 
 395         return false;
 396 }
 397 EXPORT_SYMBOL(mipi_dsi_packet_format_is_short);
 398 
 399 /**
 400  * mipi_dsi_packet_format_is_long - check if a packet is of the long format
 401  * @type: MIPI DSI data type of the packet
 402  *
 403  * Return: true if the packet for the given data type is a long packet, false
 404  * otherwise.
 405  */
 406 bool mipi_dsi_packet_format_is_long(u8 type)
 407 {
 408         switch (type) {
 409         case MIPI_DSI_PPS_LONG_WRITE:
 410         case MIPI_DSI_NULL_PACKET:
 411         case MIPI_DSI_BLANKING_PACKET:
 412         case MIPI_DSI_GENERIC_LONG_WRITE:
 413         case MIPI_DSI_DCS_LONG_WRITE:
 414         case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20:
 415         case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24:
 416         case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16:
 417         case MIPI_DSI_PACKED_PIXEL_STREAM_30:
 418         case MIPI_DSI_PACKED_PIXEL_STREAM_36:
 419         case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12:
 420         case MIPI_DSI_PACKED_PIXEL_STREAM_16:
 421         case MIPI_DSI_PACKED_PIXEL_STREAM_18:
 422         case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
 423         case MIPI_DSI_PACKED_PIXEL_STREAM_24:
 424                 return true;
 425         }
 426 
 427         return false;
 428 }
 429 EXPORT_SYMBOL(mipi_dsi_packet_format_is_long);
 430 
 431 /**
 432  * mipi_dsi_create_packet - create a packet from a message according to the
 433  *     DSI protocol
 434  * @packet: pointer to a DSI packet structure
 435  * @msg: message to translate into a packet
 436  *
 437  * Return: 0 on success or a negative error code on failure.
 438  */
 439 int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
 440                            const struct mipi_dsi_msg *msg)
 441 {
 442         if (!packet || !msg)
 443                 return -EINVAL;
 444 
 445         /* do some minimum sanity checking */
 446         if (!mipi_dsi_packet_format_is_short(msg->type) &&
 447             !mipi_dsi_packet_format_is_long(msg->type))
 448                 return -EINVAL;
 449 
 450         if (msg->channel > 3)
 451                 return -EINVAL;
 452 
 453         memset(packet, 0, sizeof(*packet));
 454         packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f);
 455 
 456         /* TODO: compute ECC if hardware support is not available */
 457 
 458         /*
 459          * Long write packets contain the word count in header bytes 1 and 2.
 460          * The payload follows the header and is word count bytes long.
 461          *
 462          * Short write packets encode up to two parameters in header bytes 1
 463          * and 2.
 464          */
 465         if (mipi_dsi_packet_format_is_long(msg->type)) {
 466                 packet->header[1] = (msg->tx_len >> 0) & 0xff;
 467                 packet->header[2] = (msg->tx_len >> 8) & 0xff;
 468 
 469                 packet->payload_length = msg->tx_len;
 470                 packet->payload = msg->tx_buf;
 471         } else {
 472                 const u8 *tx = msg->tx_buf;
 473 
 474                 packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0;
 475                 packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0;
 476         }
 477 
 478         packet->size = sizeof(packet->header) + packet->payload_length;
 479 
 480         return 0;
 481 }
 482 EXPORT_SYMBOL(mipi_dsi_create_packet);
 483 
 484 /**
 485  * mipi_dsi_shutdown_peripheral() - sends a Shutdown Peripheral command
 486  * @dsi: DSI peripheral device
 487  *
 488  * Return: 0 on success or a negative error code on failure.
 489  */
 490 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi)
 491 {
 492         struct mipi_dsi_msg msg = {
 493                 .channel = dsi->channel,
 494                 .type = MIPI_DSI_SHUTDOWN_PERIPHERAL,
 495                 .tx_buf = (u8 [2]) { 0, 0 },
 496                 .tx_len = 2,
 497         };
 498         int ret = mipi_dsi_device_transfer(dsi, &msg);
 499 
 500         return (ret < 0) ? ret : 0;
 501 }
 502 EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral);
 503 
 504 /**
 505  * mipi_dsi_turn_on_peripheral() - sends a Turn On Peripheral command
 506  * @dsi: DSI peripheral device
 507  *
 508  * Return: 0 on success or a negative error code on failure.
 509  */
 510 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi)
 511 {
 512         struct mipi_dsi_msg msg = {
 513                 .channel = dsi->channel,
 514                 .type = MIPI_DSI_TURN_ON_PERIPHERAL,
 515                 .tx_buf = (u8 [2]) { 0, 0 },
 516                 .tx_len = 2,
 517         };
 518         int ret = mipi_dsi_device_transfer(dsi, &msg);
 519 
 520         return (ret < 0) ? ret : 0;
 521 }
 522 EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral);
 523 
 524 /*
 525  * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the
 526  *    the payload in a long packet transmitted from the peripheral back to the
 527  *    host processor
 528  * @dsi: DSI peripheral device
 529  * @value: the maximum size of the payload
 530  *
 531  * Return: 0 on success or a negative error code on failure.
 532  */
 533 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
 534                                             u16 value)
 535 {
 536         u8 tx[2] = { value & 0xff, value >> 8 };
 537         struct mipi_dsi_msg msg = {
 538                 .channel = dsi->channel,
 539                 .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
 540                 .tx_len = sizeof(tx),
 541                 .tx_buf = tx,
 542         };
 543         int ret = mipi_dsi_device_transfer(dsi, &msg);
 544 
 545         return (ret < 0) ? ret : 0;
 546 }
 547 EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
 548 
 549 /**
 550  * mipi_dsi_generic_write() - transmit data using a generic write packet
 551  * @dsi: DSI peripheral device
 552  * @payload: buffer containing the payload
 553  * @size: size of payload buffer
 554  *
 555  * This function will automatically choose the right data type depending on
 556  * the payload length.
 557  *
 558  * Return: The number of bytes transmitted on success or a negative error code
 559  * on failure.
 560  */
 561 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
 562                                size_t size)
 563 {
 564         struct mipi_dsi_msg msg = {
 565                 .channel = dsi->channel,
 566                 .tx_buf = payload,
 567                 .tx_len = size
 568         };
 569 
 570         switch (size) {
 571         case 0:
 572                 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
 573                 break;
 574 
 575         case 1:
 576                 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
 577                 break;
 578 
 579         case 2:
 580                 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
 581                 break;
 582 
 583         default:
 584                 msg.type = MIPI_DSI_GENERIC_LONG_WRITE;
 585                 break;
 586         }
 587 
 588         return mipi_dsi_device_transfer(dsi, &msg);
 589 }
 590 EXPORT_SYMBOL(mipi_dsi_generic_write);
 591 
 592 /**
 593  * mipi_dsi_generic_read() - receive data using a generic read packet
 594  * @dsi: DSI peripheral device
 595  * @params: buffer containing the request parameters
 596  * @num_params: number of request parameters
 597  * @data: buffer in which to return the received data
 598  * @size: size of receive buffer
 599  *
 600  * This function will automatically choose the right data type depending on
 601  * the number of parameters passed in.
 602  *
 603  * Return: The number of bytes successfully read or a negative error code on
 604  * failure.
 605  */
 606 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
 607                               size_t num_params, void *data, size_t size)
 608 {
 609         struct mipi_dsi_msg msg = {
 610                 .channel = dsi->channel,
 611                 .tx_len = num_params,
 612                 .tx_buf = params,
 613                 .rx_len = size,
 614                 .rx_buf = data
 615         };
 616 
 617         switch (num_params) {
 618         case 0:
 619                 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
 620                 break;
 621 
 622         case 1:
 623                 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
 624                 break;
 625 
 626         case 2:
 627                 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
 628                 break;
 629 
 630         default:
 631                 return -EINVAL;
 632         }
 633 
 634         return mipi_dsi_device_transfer(dsi, &msg);
 635 }
 636 EXPORT_SYMBOL(mipi_dsi_generic_read);
 637 
 638 /**
 639  * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
 640  * @dsi: DSI peripheral device
 641  * @data: buffer containing data to be transmitted
 642  * @len: size of transmission buffer
 643  *
 644  * This function will automatically choose the right data type depending on
 645  * the command payload length.
 646  *
 647  * Return: The number of bytes successfully transmitted or a negative error
 648  * code on failure.
 649  */
 650 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
 651                                   const void *data, size_t len)
 652 {
 653         struct mipi_dsi_msg msg = {
 654                 .channel = dsi->channel,
 655                 .tx_buf = data,
 656                 .tx_len = len
 657         };
 658 
 659         switch (len) {
 660         case 0:
 661                 return -EINVAL;
 662 
 663         case 1:
 664                 msg.type = MIPI_DSI_DCS_SHORT_WRITE;
 665                 break;
 666 
 667         case 2:
 668                 msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
 669                 break;
 670 
 671         default:
 672                 msg.type = MIPI_DSI_DCS_LONG_WRITE;
 673                 break;
 674         }
 675 
 676         return mipi_dsi_device_transfer(dsi, &msg);
 677 }
 678 EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer);
 679 
 680 /**
 681  * mipi_dsi_dcs_write() - send DCS write command
 682  * @dsi: DSI peripheral device
 683  * @cmd: DCS command
 684  * @data: buffer containing the command payload
 685  * @len: command payload length
 686  *
 687  * This function will automatically choose the right data type depending on
 688  * the command payload length.
 689  *
 690  * Return: The number of bytes successfully transmitted or a negative error
 691  * code on failure.
 692  */
 693 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
 694                            const void *data, size_t len)
 695 {
 696         ssize_t err;
 697         size_t size;
 698         u8 *tx;
 699 
 700         if (len > 0) {
 701                 size = 1 + len;
 702 
 703                 tx = kmalloc(size, GFP_KERNEL);
 704                 if (!tx)
 705                         return -ENOMEM;
 706 
 707                 /* concatenate the DCS command byte and the payload */
 708                 tx[0] = cmd;
 709                 memcpy(&tx[1], data, len);
 710         } else {
 711                 tx = &cmd;
 712                 size = 1;
 713         }
 714 
 715         err = mipi_dsi_dcs_write_buffer(dsi, tx, size);
 716 
 717         if (len > 0)
 718                 kfree(tx);
 719 
 720         return err;
 721 }
 722 EXPORT_SYMBOL(mipi_dsi_dcs_write);
 723 
 724 /**
 725  * mipi_dsi_dcs_read() - send DCS read request command
 726  * @dsi: DSI peripheral device
 727  * @cmd: DCS command
 728  * @data: buffer in which to receive data
 729  * @len: size of receive buffer
 730  *
 731  * Return: The number of bytes read or a negative error code on failure.
 732  */
 733 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
 734                           size_t len)
 735 {
 736         struct mipi_dsi_msg msg = {
 737                 .channel = dsi->channel,
 738                 .type = MIPI_DSI_DCS_READ,
 739                 .tx_buf = &cmd,
 740                 .tx_len = 1,
 741                 .rx_buf = data,
 742                 .rx_len = len
 743         };
 744 
 745         return mipi_dsi_device_transfer(dsi, &msg);
 746 }
 747 EXPORT_SYMBOL(mipi_dsi_dcs_read);
 748 
 749 /**
 750  * mipi_dsi_dcs_nop() - send DCS nop packet
 751  * @dsi: DSI peripheral device
 752  *
 753  * Return: 0 on success or a negative error code on failure.
 754  */
 755 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi)
 756 {
 757         ssize_t err;
 758 
 759         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0);
 760         if (err < 0)
 761                 return err;
 762 
 763         return 0;
 764 }
 765 EXPORT_SYMBOL(mipi_dsi_dcs_nop);
 766 
 767 /**
 768  * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
 769  * @dsi: DSI peripheral device
 770  *
 771  * Return: 0 on success or a negative error code on failure.
 772  */
 773 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi)
 774 {
 775         ssize_t err;
 776 
 777         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0);
 778         if (err < 0)
 779                 return err;
 780 
 781         return 0;
 782 }
 783 EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset);
 784 
 785 /**
 786  * mipi_dsi_dcs_get_power_mode() - query the display module's current power
 787  *    mode
 788  * @dsi: DSI peripheral device
 789  * @mode: return location for the current power mode
 790  *
 791  * Return: 0 on success or a negative error code on failure.
 792  */
 793 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
 794 {
 795         ssize_t err;
 796 
 797         err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode,
 798                                 sizeof(*mode));
 799         if (err <= 0) {
 800                 if (err == 0)
 801                         err = -ENODATA;
 802 
 803                 return err;
 804         }
 805 
 806         return 0;
 807 }
 808 EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);
 809 
 810 /**
 811  * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
 812  *    data used by the interface
 813  * @dsi: DSI peripheral device
 814  * @format: return location for the pixel format
 815  *
 816  * Return: 0 on success or a negative error code on failure.
 817  */
 818 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format)
 819 {
 820         ssize_t err;
 821 
 822         err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format,
 823                                 sizeof(*format));
 824         if (err <= 0) {
 825                 if (err == 0)
 826                         err = -ENODATA;
 827 
 828                 return err;
 829         }
 830 
 831         return 0;
 832 }
 833 EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format);
 834 
 835 /**
 836  * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
 837  *    display module except interface communication
 838  * @dsi: DSI peripheral device
 839  *
 840  * Return: 0 on success or a negative error code on failure.
 841  */
 842 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi)
 843 {
 844         ssize_t err;
 845 
 846         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
 847         if (err < 0)
 848                 return err;
 849 
 850         return 0;
 851 }
 852 EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode);
 853 
 854 /**
 855  * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
 856  *    module
 857  * @dsi: DSI peripheral device
 858  *
 859  * Return: 0 on success or a negative error code on failure.
 860  */
 861 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi)
 862 {
 863         ssize_t err;
 864 
 865         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0);
 866         if (err < 0)
 867                 return err;
 868 
 869         return 0;
 870 }
 871 EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode);
 872 
 873 /**
 874  * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
 875  *    display device
 876  * @dsi: DSI peripheral device
 877  *
 878  * Return: 0 on success or a negative error code on failure.
 879  */
 880 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi)
 881 {
 882         ssize_t err;
 883 
 884         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
 885         if (err < 0)
 886                 return err;
 887 
 888         return 0;
 889 }
 890 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off);
 891 
 892 /**
 893  * mipi_dsi_dcs_set_display_on() - start displaying the image data on the
 894  *    display device
 895  * @dsi: DSI peripheral device
 896  *
 897  * Return: 0 on success or a negative error code on failure
 898  */
 899 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi)
 900 {
 901         ssize_t err;
 902 
 903         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0);
 904         if (err < 0)
 905                 return err;
 906 
 907         return 0;
 908 }
 909 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on);
 910 
 911 /**
 912  * mipi_dsi_dcs_set_column_address() - define the column extent of the frame
 913  *    memory accessed by the host processor
 914  * @dsi: DSI peripheral device
 915  * @start: first column of frame memory
 916  * @end: last column of frame memory
 917  *
 918  * Return: 0 on success or a negative error code on failure.
 919  */
 920 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
 921                                     u16 end)
 922 {
 923         u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
 924         ssize_t err;
 925 
 926         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload,
 927                                  sizeof(payload));
 928         if (err < 0)
 929                 return err;
 930 
 931         return 0;
 932 }
 933 EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address);
 934 
 935 /**
 936  * mipi_dsi_dcs_set_page_address() - define the page extent of the frame
 937  *    memory accessed by the host processor
 938  * @dsi: DSI peripheral device
 939  * @start: first page of frame memory
 940  * @end: last page of frame memory
 941  *
 942  * Return: 0 on success or a negative error code on failure.
 943  */
 944 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
 945                                   u16 end)
 946 {
 947         u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
 948         ssize_t err;
 949 
 950         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload,
 951                                  sizeof(payload));
 952         if (err < 0)
 953                 return err;
 954 
 955         return 0;
 956 }
 957 EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address);
 958 
 959 /**
 960  * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
 961  *    output signal on the TE signal line
 962  * @dsi: DSI peripheral device
 963  *
 964  * Return: 0 on success or a negative error code on failure
 965  */
 966 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi)
 967 {
 968         ssize_t err;
 969 
 970         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0);
 971         if (err < 0)
 972                 return err;
 973 
 974         return 0;
 975 }
 976 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off);
 977 
 978 /**
 979  * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
 980  *    output signal on the TE signal line.
 981  * @dsi: DSI peripheral device
 982  * @mode: the Tearing Effect Output Line mode
 983  *
 984  * Return: 0 on success or a negative error code on failure
 985  */
 986 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
 987                              enum mipi_dsi_dcs_tear_mode mode)
 988 {
 989         u8 value = mode;
 990         ssize_t err;
 991 
 992         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value,
 993                                  sizeof(value));
 994         if (err < 0)
 995                 return err;
 996 
 997         return 0;
 998 }
 999 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
1000 
1001 /**
1002  * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
1003  *    data used by the interface
1004  * @dsi: DSI peripheral device
1005  * @format: pixel format
1006  *
1007  * Return: 0 on success or a negative error code on failure.
1008  */
1009 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
1010 {
1011         ssize_t err;
1012 
1013         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format,
1014                                  sizeof(format));
1015         if (err < 0)
1016                 return err;
1017 
1018         return 0;
1019 }
1020 EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
1021 
1022 /**
1023  * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for
1024  *    the Tearing Effect output signal of the display module
1025  * @dsi: DSI peripheral device
1026  * @scanline: scanline to use as trigger
1027  *
1028  * Return: 0 on success or a negative error code on failure
1029  */
1030 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
1031 {
1032         u8 payload[3] = { MIPI_DCS_SET_TEAR_SCANLINE, scanline >> 8,
1033                           scanline & 0xff };
1034         ssize_t err;
1035 
1036         err = mipi_dsi_generic_write(dsi, payload, sizeof(payload));
1037         if (err < 0)
1038                 return err;
1039 
1040         return 0;
1041 }
1042 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline);
1043 
1044 /**
1045  * mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the
1046  *    display
1047  * @dsi: DSI peripheral device
1048  * @brightness: brightness value
1049  *
1050  * Return: 0 on success or a negative error code on failure.
1051  */
1052 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
1053                                         u16 brightness)
1054 {
1055         u8 payload[2] = { brightness & 0xff, brightness >> 8 };
1056         ssize_t err;
1057 
1058         err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
1059                                  payload, sizeof(payload));
1060         if (err < 0)
1061                 return err;
1062 
1063         return 0;
1064 }
1065 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness);
1066 
1067 /**
1068  * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value
1069  *    of the display
1070  * @dsi: DSI peripheral device
1071  * @brightness: brightness value
1072  *
1073  * Return: 0 on success or a negative error code on failure.
1074  */
1075 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
1076                                         u16 *brightness)
1077 {
1078         ssize_t err;
1079 
1080         err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
1081                                 brightness, sizeof(*brightness));
1082         if (err <= 0) {
1083                 if (err == 0)
1084                         err = -ENODATA;
1085 
1086                 return err;
1087         }
1088 
1089         return 0;
1090 }
1091 EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness);
1092 
1093 static int mipi_dsi_drv_probe(struct device *dev)
1094 {
1095         struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1096         struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1097 
1098         return drv->probe(dsi);
1099 }
1100 
1101 static int mipi_dsi_drv_remove(struct device *dev)
1102 {
1103         struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1104         struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1105 
1106         return drv->remove(dsi);
1107 }
1108 
1109 static void mipi_dsi_drv_shutdown(struct device *dev)
1110 {
1111         struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1112         struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1113 
1114         drv->shutdown(dsi);
1115 }
1116 
1117 /**
1118  * mipi_dsi_driver_register_full() - register a driver for DSI devices
1119  * @drv: DSI driver structure
1120  * @owner: owner module
1121  *
1122  * Return: 0 on success or a negative error code on failure.
1123  */
1124 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *drv,
1125                                   struct module *owner)
1126 {
1127         drv->driver.bus = &mipi_dsi_bus_type;
1128         drv->driver.owner = owner;
1129 
1130         if (drv->probe)
1131                 drv->driver.probe = mipi_dsi_drv_probe;
1132         if (drv->remove)
1133                 drv->driver.remove = mipi_dsi_drv_remove;
1134         if (drv->shutdown)
1135                 drv->driver.shutdown = mipi_dsi_drv_shutdown;
1136 
1137         return driver_register(&drv->driver);
1138 }
1139 EXPORT_SYMBOL(mipi_dsi_driver_register_full);
1140 
1141 /**
1142  * mipi_dsi_driver_unregister() - unregister a driver for DSI devices
1143  * @drv: DSI driver structure
1144  *
1145  * Return: 0 on success or a negative error code on failure.
1146  */
1147 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv)
1148 {
1149         driver_unregister(&drv->driver);
1150 }
1151 EXPORT_SYMBOL(mipi_dsi_driver_unregister);
1152 
1153 static int __init mipi_dsi_bus_init(void)
1154 {
1155         return bus_register(&mipi_dsi_bus_type);
1156 }
1157 postcore_initcall(mipi_dsi_bus_init);
1158 
1159 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
1160 MODULE_DESCRIPTION("MIPI DSI Bus");
1161 MODULE_LICENSE("GPL and additional rights");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/gpu/drm/drm_mipi_dsi.c

DEFINITIONS
