4 * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
5 * Andrzej Hajda <a.hajda@samsung.com>
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:
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
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.
28 #include <drm/drm_mipi_dsi.h>
30 #include <linux/device.h>
31 #include <linux/module.h>
32 #include <linux/pm_runtime.h>
33 #include <linux/slab.h>
35 #include <video/mipi_display.h>
40 * These functions contain some common logic and helpers to deal with MIPI DSI
43 * Helpers are provided for a number of standard MIPI DSI command as well as a
44 * subset of the MIPI DCS command set.
48 static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv)
50 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
52 /* attempt OF style match */
53 if (of_driver_match_device(dev, drv))
56 /* compare DSI device and driver names */
57 if (!strcmp(dsi->name, drv->name))
63 static int mipi_dsi_uevent(struct device *dev, struct kobj_uevent_env *env)
65 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
68 err = of_device_uevent_modalias(dev, env);
72 add_uevent_var(env, "MODALIAS=%s%s", MIPI_DSI_MODULE_PREFIX,
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,
89 static struct bus_type mipi_dsi_bus_type = {
91 .match = mipi_dsi_device_match,
92 .uevent = mipi_dsi_uevent,
93 .pm = &mipi_dsi_device_pm_ops,
96 static int of_device_match(struct device *dev, void *data)
98 return dev->of_node == data;
102 * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
104 * @np: device tree node
106 * Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no
107 * such device exists (or has not been registered yet).
109 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np)
113 dev = bus_find_device(&mipi_dsi_bus_type, NULL, np, of_device_match);
115 return dev ? to_mipi_dsi_device(dev) : NULL;
117 EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node);
119 static void mipi_dsi_dev_release(struct device *dev)
121 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
123 of_node_put(dev->of_node);
127 static const struct device_type mipi_dsi_device_type = {
128 .release = mipi_dsi_dev_release,
131 static struct mipi_dsi_device *mipi_dsi_device_alloc(struct mipi_dsi_host *host)
133 struct mipi_dsi_device *dsi;
135 dsi = kzalloc(sizeof(*dsi), GFP_KERNEL);
137 return ERR_PTR(-ENOMEM);
140 dsi->dev.bus = &mipi_dsi_bus_type;
141 dsi->dev.parent = host->dev;
142 dsi->dev.type = &mipi_dsi_device_type;
144 device_initialize(&dsi->dev);
149 static int mipi_dsi_device_add(struct mipi_dsi_device *dsi)
151 struct mipi_dsi_host *host = dsi->host;
153 dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev), dsi->channel);
155 return device_add(&dsi->dev);
158 #if IS_ENABLED(CONFIG_OF)
159 static struct mipi_dsi_device *
160 of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
162 struct device *dev = host->dev;
163 struct mipi_dsi_device_info info = { };
167 if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
168 dev_err(dev, "modalias failure on %s\n", node->full_name);
169 return ERR_PTR(-EINVAL);
172 ret = of_property_read_u32(node, "reg", ®);
174 dev_err(dev, "device node %s has no valid reg property: %d\n",
175 node->full_name, ret);
176 return ERR_PTR(-EINVAL);
180 info.node = of_node_get(node);
182 return mipi_dsi_device_register_full(host, &info);
185 static struct mipi_dsi_device *
186 of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
188 return ERR_PTR(-ENODEV);
193 * mipi_dsi_device_register_full - create a MIPI DSI device
194 * @host: DSI host to which this device is connected
195 * @info: pointer to template containing DSI device information
197 * Create a MIPI DSI device by using the device information provided by
198 * mipi_dsi_device_info template
201 * A pointer to the newly created MIPI DSI device, or, a pointer encoded
204 struct mipi_dsi_device *
205 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
206 const struct mipi_dsi_device_info *info)
208 struct mipi_dsi_device *dsi;
209 struct device *dev = host->dev;
213 dev_err(dev, "invalid mipi_dsi_device_info pointer\n");
214 return ERR_PTR(-EINVAL);
217 if (info->channel > 3) {
218 dev_err(dev, "invalid virtual channel: %u\n", info->channel);
219 return ERR_PTR(-EINVAL);
222 dsi = mipi_dsi_device_alloc(host);
224 dev_err(dev, "failed to allocate DSI device %ld\n",
229 dsi->dev.of_node = info->node;
230 dsi->channel = info->channel;
231 strlcpy(dsi->name, info->type, sizeof(dsi->name));
233 ret = mipi_dsi_device_add(dsi);
235 dev_err(dev, "failed to add DSI device %d\n", ret);
242 EXPORT_SYMBOL(mipi_dsi_device_register_full);
245 * mipi_dsi_device_unregister - unregister MIPI DSI device
246 * @dsi: DSI peripheral device
248 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi)
250 device_unregister(&dsi->dev);
252 EXPORT_SYMBOL(mipi_dsi_device_unregister);
254 static DEFINE_MUTEX(host_lock);
255 static LIST_HEAD(host_list);
258 * of_find_mipi_dsi_host_by_node() - find the MIPI DSI host matching a
260 * @node: device tree node
263 * A pointer to the MIPI DSI host corresponding to @node or NULL if no
264 * such device exists (or has not been registered yet).
266 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node)
268 struct mipi_dsi_host *host;
270 mutex_lock(&host_lock);
272 list_for_each_entry(host, &host_list, list) {
273 if (host->dev->of_node == node) {
274 mutex_unlock(&host_lock);
279 mutex_unlock(&host_lock);
283 EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node);
285 int mipi_dsi_host_register(struct mipi_dsi_host *host)
287 struct device_node *node;
289 for_each_available_child_of_node(host->dev->of_node, node) {
290 /* skip nodes without reg property */
291 if (!of_find_property(node, "reg", NULL))
293 of_mipi_dsi_device_add(host, node);
296 mutex_lock(&host_lock);
297 list_add_tail(&host->list, &host_list);
298 mutex_unlock(&host_lock);
302 EXPORT_SYMBOL(mipi_dsi_host_register);
304 static int mipi_dsi_remove_device_fn(struct device *dev, void *priv)
306 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
308 mipi_dsi_device_unregister(dsi);
313 void mipi_dsi_host_unregister(struct mipi_dsi_host *host)
315 device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn);
317 mutex_lock(&host_lock);
318 list_del_init(&host->list);
319 mutex_unlock(&host_lock);
321 EXPORT_SYMBOL(mipi_dsi_host_unregister);
325 * mipi_dsi_attach - attach a DSI device to its DSI host
326 * @dsi: DSI peripheral
328 int mipi_dsi_attach(struct mipi_dsi_device *dsi)
330 const struct mipi_dsi_host_ops *ops = dsi->host->ops;
332 if (!ops || !ops->attach)
335 return ops->attach(dsi->host, dsi);
337 EXPORT_SYMBOL(mipi_dsi_attach);
340 * mipi_dsi_detach - detach a DSI device from its DSI host
341 * @dsi: DSI peripheral
343 int mipi_dsi_detach(struct mipi_dsi_device *dsi)
345 const struct mipi_dsi_host_ops *ops = dsi->host->ops;
347 if (!ops || !ops->detach)
350 return ops->detach(dsi->host, dsi);
352 EXPORT_SYMBOL(mipi_dsi_detach);
354 static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi,
355 struct mipi_dsi_msg *msg)
357 const struct mipi_dsi_host_ops *ops = dsi->host->ops;
359 if (!ops || !ops->transfer)
362 if (dsi->mode_flags & MIPI_DSI_MODE_LPM)
363 msg->flags |= MIPI_DSI_MSG_USE_LPM;
365 return ops->transfer(dsi->host, msg);
369 * mipi_dsi_packet_format_is_short - check if a packet is of the short format
370 * @type: MIPI DSI data type of the packet
372 * Return: true if the packet for the given data type is a short packet, false
375 bool mipi_dsi_packet_format_is_short(u8 type)
378 case MIPI_DSI_V_SYNC_START:
379 case MIPI_DSI_V_SYNC_END:
380 case MIPI_DSI_H_SYNC_START:
381 case MIPI_DSI_H_SYNC_END:
382 case MIPI_DSI_END_OF_TRANSMISSION:
383 case MIPI_DSI_COLOR_MODE_OFF:
384 case MIPI_DSI_COLOR_MODE_ON:
385 case MIPI_DSI_SHUTDOWN_PERIPHERAL:
386 case MIPI_DSI_TURN_ON_PERIPHERAL:
387 case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
388 case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
389 case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
390 case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
391 case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
392 case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
393 case MIPI_DSI_DCS_SHORT_WRITE:
394 case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
395 case MIPI_DSI_DCS_READ:
396 case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
402 EXPORT_SYMBOL(mipi_dsi_packet_format_is_short);
405 * mipi_dsi_packet_format_is_long - check if a packet is of the long format
406 * @type: MIPI DSI data type of the packet
408 * Return: true if the packet for the given data type is a long packet, false
411 bool mipi_dsi_packet_format_is_long(u8 type)
414 case MIPI_DSI_NULL_PACKET:
415 case MIPI_DSI_BLANKING_PACKET:
416 case MIPI_DSI_GENERIC_LONG_WRITE:
417 case MIPI_DSI_DCS_LONG_WRITE:
418 case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20:
419 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24:
420 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16:
421 case MIPI_DSI_PACKED_PIXEL_STREAM_30:
422 case MIPI_DSI_PACKED_PIXEL_STREAM_36:
423 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12:
424 case MIPI_DSI_PACKED_PIXEL_STREAM_16:
425 case MIPI_DSI_PACKED_PIXEL_STREAM_18:
426 case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
427 case MIPI_DSI_PACKED_PIXEL_STREAM_24:
433 EXPORT_SYMBOL(mipi_dsi_packet_format_is_long);
436 * mipi_dsi_create_packet - create a packet from a message according to the
438 * @packet: pointer to a DSI packet structure
439 * @msg: message to translate into a packet
441 * Return: 0 on success or a negative error code on failure.
443 int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
444 const struct mipi_dsi_msg *msg)
449 /* do some minimum sanity checking */
450 if (!mipi_dsi_packet_format_is_short(msg->type) &&
451 !mipi_dsi_packet_format_is_long(msg->type))
454 if (msg->channel > 3)
457 memset(packet, 0, sizeof(*packet));
458 packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f);
460 /* TODO: compute ECC if hardware support is not available */
463 * Long write packets contain the word count in header bytes 1 and 2.
464 * The payload follows the header and is word count bytes long.
466 * Short write packets encode up to two parameters in header bytes 1
469 if (mipi_dsi_packet_format_is_long(msg->type)) {
470 packet->header[1] = (msg->tx_len >> 0) & 0xff;
471 packet->header[2] = (msg->tx_len >> 8) & 0xff;
473 packet->payload_length = msg->tx_len;
474 packet->payload = msg->tx_buf;
476 const u8 *tx = msg->tx_buf;
478 packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0;
479 packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0;
482 packet->size = sizeof(packet->header) + packet->payload_length;
486 EXPORT_SYMBOL(mipi_dsi_create_packet);
489 * mipi_dsi_shutdown_peripheral() - sends a Shutdown Peripheral command
490 * @dsi: DSI peripheral device
492 * Return: 0 on success or a negative error code on failure.
494 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi)
496 struct mipi_dsi_msg msg = {
497 .channel = dsi->channel,
498 .type = MIPI_DSI_SHUTDOWN_PERIPHERAL,
499 .tx_buf = (u8 [2]) { 0, 0 },
503 return mipi_dsi_device_transfer(dsi, &msg);
505 EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral);
508 * mipi_dsi_turn_on_peripheral() - sends a Turn On Peripheral command
509 * @dsi: DSI peripheral device
511 * Return: 0 on success or a negative error code on failure.
513 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi)
515 struct mipi_dsi_msg msg = {
516 .channel = dsi->channel,
517 .type = MIPI_DSI_TURN_ON_PERIPHERAL,
518 .tx_buf = (u8 [2]) { 0, 0 },
522 return mipi_dsi_device_transfer(dsi, &msg);
524 EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral);
528 * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the
529 * the payload in a long packet transmitted from the peripheral back to the
531 * @dsi: DSI peripheral device
532 * @value: the maximum size of the payload
534 * Return: 0 on success or a negative error code on failure.
536 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
539 u8 tx[2] = { value & 0xff, value >> 8 };
540 struct mipi_dsi_msg msg = {
541 .channel = dsi->channel,
542 .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
543 .tx_len = sizeof(tx),
547 return mipi_dsi_device_transfer(dsi, &msg);
549 EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
553 * mipi_dsi_generic_write() - transmit data using a generic write packet
554 * @dsi: DSI peripheral device
555 * @payload: buffer containing the payload
556 * @size: size of payload buffer
558 * This function will automatically choose the right data type depending on
559 * the payload length.
561 * Return: The number of bytes transmitted on success or a negative error code
564 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
567 struct mipi_dsi_msg msg = {
568 .channel = dsi->channel,
575 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
579 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
583 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
587 msg.type = MIPI_DSI_GENERIC_LONG_WRITE;
591 return mipi_dsi_device_transfer(dsi, &msg);
593 EXPORT_SYMBOL(mipi_dsi_generic_write);
596 * mipi_dsi_generic_read() - receive data using a generic read packet
597 * @dsi: DSI peripheral device
598 * @params: buffer containing the request parameters
599 * @num_params: number of request parameters
600 * @data: buffer in which to return the received data
601 * @size: size of receive buffer
603 * This function will automatically choose the right data type depending on
604 * the number of parameters passed in.
606 * Return: The number of bytes successfully read or a negative error code on
609 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
610 size_t num_params, void *data, size_t size)
612 struct mipi_dsi_msg msg = {
613 .channel = dsi->channel,
614 .tx_len = num_params,
620 switch (num_params) {
622 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
626 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
630 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
637 return mipi_dsi_device_transfer(dsi, &msg);
639 EXPORT_SYMBOL(mipi_dsi_generic_read);
642 * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
643 * @dsi: DSI peripheral device
644 * @data: buffer containing data to be transmitted
645 * @len: size of transmission buffer
647 * This function will automatically choose the right data type depending on
648 * the command payload length.
650 * Return: The number of bytes successfully transmitted or a negative error
653 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
654 const void *data, size_t len)
656 struct mipi_dsi_msg msg = {
657 .channel = dsi->channel,
667 msg.type = MIPI_DSI_DCS_SHORT_WRITE;
671 msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
675 msg.type = MIPI_DSI_DCS_LONG_WRITE;
679 return mipi_dsi_device_transfer(dsi, &msg);
681 EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer);
684 * mipi_dsi_dcs_write() - send DCS write command
685 * @dsi: DSI peripheral device
687 * @data: buffer containing the command payload
688 * @len: command payload length
690 * This function will automatically choose the right data type depending on
691 * the command payload length.
693 * Return: The number of bytes successfully transmitted or a negative error
696 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
697 const void *data, size_t len)
706 tx = kmalloc(size, M_DRM, GFP_KERNEL);
710 /* concatenate the DCS command byte and the payload */
712 memcpy(&tx[1], data, len);
718 err = mipi_dsi_dcs_write_buffer(dsi, tx, size);
725 EXPORT_SYMBOL(mipi_dsi_dcs_write);
728 * mipi_dsi_dcs_read() - send DCS read request command
729 * @dsi: DSI peripheral device
731 * @data: buffer in which to receive data
732 * @len: size of receive buffer
734 * Return: The number of bytes read or a negative error code on failure.
736 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
739 struct mipi_dsi_msg msg = {
740 .channel = dsi->channel,
741 .type = MIPI_DSI_DCS_READ,
748 return mipi_dsi_device_transfer(dsi, &msg);
750 EXPORT_SYMBOL(mipi_dsi_dcs_read);
753 * mipi_dsi_dcs_nop() - send DCS nop packet
754 * @dsi: DSI peripheral device
756 * Return: 0 on success or a negative error code on failure.
758 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi)
762 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0);
768 EXPORT_SYMBOL(mipi_dsi_dcs_nop);
772 * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
773 * @dsi: DSI peripheral device
775 * Return: 0 on success or a negative error code on failure.
777 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi)
781 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0);
787 EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset);
790 * mipi_dsi_dcs_get_power_mode() - query the display module's current power
792 * @dsi: DSI peripheral device
793 * @mode: return location for the current power mode
795 * Return: 0 on success or a negative error code on failure.
797 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
801 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode,
812 EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);
815 * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
816 * data used by the interface
817 * @dsi: DSI peripheral device
818 * @format: return location for the pixel format
820 * Return: 0 on success or a negative error code on failure.
822 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format)
826 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format,
837 EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format);
840 * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
841 * display module except interface communication
842 * @dsi: DSI peripheral device
844 * Return: 0 on success or a negative error code on failure.
846 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi)
850 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
856 EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode);
859 * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
861 * @dsi: DSI peripheral device
863 * Return: 0 on success or a negative error code on failure.
865 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi)
869 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0);
875 EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode);
878 * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
880 * @dsi: DSI peripheral device
882 * Return: 0 on success or a negative error code on failure.
884 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi)
888 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
894 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off);
897 * mipi_dsi_dcs_set_display_on() - start displaying the image data on the
899 * @dsi: DSI peripheral device
901 * Return: 0 on success or a negative error code on failure
903 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi)
907 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0);
913 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on);
916 * mipi_dsi_dcs_set_column_address() - define the column extent of the frame
917 * memory accessed by the host processor
918 * @dsi: DSI peripheral device
919 * @start: first column of frame memory
920 * @end: last column of frame memory
922 * Return: 0 on success or a negative error code on failure.
924 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
927 u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
930 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload,
937 EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address);
940 * mipi_dsi_dcs_set_page_address() - define the page extent of the frame
941 * memory accessed by the host processor
942 * @dsi: DSI peripheral device
943 * @start: first page of frame memory
944 * @end: last page of frame memory
946 * Return: 0 on success or a negative error code on failure.
948 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
951 u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
954 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload,
961 EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address);
964 * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
965 * output signal on the TE signal line
966 * @dsi: DSI peripheral device
968 * Return: 0 on success or a negative error code on failure
970 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi)
974 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0);
980 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off);
983 * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
984 * output signal on the TE signal line.
985 * @dsi: DSI peripheral device
986 * @mode: the Tearing Effect Output Line mode
988 * Return: 0 on success or a negative error code on failure
990 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
991 enum mipi_dsi_dcs_tear_mode mode)
996 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value,
1003 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
1006 * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
1007 * data used by the interface
1008 * @dsi: DSI peripheral device
1009 * @format: pixel format
1011 * Return: 0 on success or a negative error code on failure.
1013 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
1017 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format,
1024 EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
1027 * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for
1028 * the Tearing Effect output signal of the display module
1029 * @dsi: DSI peripheral device
1030 * @scanline: scanline to use as trigger
1032 * Return: 0 on success or a negative error code on failure
1034 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
1036 u8 payload[3] = { MIPI_DCS_SET_TEAR_SCANLINE, scanline >> 8,
1040 err = mipi_dsi_generic_write(dsi, payload, sizeof(payload));
1046 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline);
1049 * mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the
1051 * @dsi: DSI peripheral device
1052 * @brightness: brightness value
1054 * Return: 0 on success or a negative error code on failure.
1056 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
1059 u8 payload[2] = { brightness & 0xff, brightness >> 8 };
1062 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
1063 payload, sizeof(payload));
1069 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness);
1072 * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value
1074 * @dsi: DSI peripheral device
1075 * @brightness: brightness value
1077 * Return: 0 on success or a negative error code on failure.
1079 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
1084 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
1085 brightness, sizeof(*brightness));
1095 EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness);
1097 static int mipi_dsi_drv_probe(struct device *dev)
1099 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1100 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1102 return drv->probe(dsi);
1105 static int mipi_dsi_drv_remove(struct device *dev)
1107 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1108 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1110 return drv->remove(dsi);
1113 static void mipi_dsi_drv_shutdown(struct device *dev)
1115 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1116 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1122 * mipi_dsi_driver_register_full() - register a driver for DSI devices
1123 * @drv: DSI driver structure
1124 * @owner: owner module
1126 * Return: 0 on success or a negative error code on failure.
1128 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *drv,
1129 struct module *owner)
1131 drv->driver.bus = &mipi_dsi_bus_type;
1132 drv->driver.owner = owner;
1135 drv->driver.probe = mipi_dsi_drv_probe;
1137 drv->driver.remove = mipi_dsi_drv_remove;
1139 drv->driver.shutdown = mipi_dsi_drv_shutdown;
1141 return driver_register(&drv->driver);
1143 EXPORT_SYMBOL(mipi_dsi_driver_register_full);
1146 * mipi_dsi_driver_unregister() - unregister a driver for DSI devices
1147 * @drv: DSI driver structure
1149 * Return: 0 on success or a negative error code on failure.
1151 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv)
1153 driver_unregister(&drv->driver);
1155 EXPORT_SYMBOL(mipi_dsi_driver_unregister);
1157 static int __init mipi_dsi_bus_init(void)
1159 return bus_register(&mipi_dsi_bus_type);
1161 postcore_initcall(mipi_dsi_bus_init);
1164 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
1165 MODULE_DESCRIPTION("MIPI DSI Bus");