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/of_device.h>
33 #include <linux/pm_runtime.h>
34 #include <linux/slab.h>
36 #include <video/mipi_display.h>
41 * These functions contain some common logic and helpers to deal with MIPI DSI
44 * Helpers are provided for a number of standard MIPI DSI command as well as a
45 * 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 %pOF\n", node);
169 return ERR_PTR(-EINVAL);
172 ret = of_property_read_u32(node, "reg", ®);
174 dev_err(dev, "device node %pOF has no valid reg property: %d\n",
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_detach(dsi);
309 mipi_dsi_device_unregister(dsi);
314 void mipi_dsi_host_unregister(struct mipi_dsi_host *host)
316 device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn);
318 mutex_lock(&host_lock);
319 list_del_init(&host->list);
320 mutex_unlock(&host_lock);
322 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);
527 * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the
528 * the payload in a long packet transmitted from the peripheral back to the
530 * @dsi: DSI peripheral device
531 * @value: the maximum size of the payload
533 * Return: 0 on success or a negative error code on failure.
535 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
538 u8 tx[2] = { value & 0xff, value >> 8 };
539 struct mipi_dsi_msg msg = {
540 .channel = dsi->channel,
541 .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
542 .tx_len = sizeof(tx),
546 return mipi_dsi_device_transfer(dsi, &msg);
548 EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
551 * mipi_dsi_generic_write() - transmit data using a generic write packet
552 * @dsi: DSI peripheral device
553 * @payload: buffer containing the payload
554 * @size: size of payload buffer
556 * This function will automatically choose the right data type depending on
557 * the payload length.
559 * Return: The number of bytes transmitted on success or a negative error code
562 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
565 struct mipi_dsi_msg msg = {
566 .channel = dsi->channel,
573 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
577 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
581 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
585 msg.type = MIPI_DSI_GENERIC_LONG_WRITE;
589 return mipi_dsi_device_transfer(dsi, &msg);
591 EXPORT_SYMBOL(mipi_dsi_generic_write);
594 * mipi_dsi_generic_read() - receive data using a generic read packet
595 * @dsi: DSI peripheral device
596 * @params: buffer containing the request parameters
597 * @num_params: number of request parameters
598 * @data: buffer in which to return the received data
599 * @size: size of receive buffer
601 * This function will automatically choose the right data type depending on
602 * the number of parameters passed in.
604 * Return: The number of bytes successfully read or a negative error code on
607 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
608 size_t num_params, void *data, size_t size)
610 struct mipi_dsi_msg msg = {
611 .channel = dsi->channel,
612 .tx_len = num_params,
618 switch (num_params) {
620 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
624 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
628 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
635 return mipi_dsi_device_transfer(dsi, &msg);
637 EXPORT_SYMBOL(mipi_dsi_generic_read);
640 * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
641 * @dsi: DSI peripheral device
642 * @data: buffer containing data to be transmitted
643 * @len: size of transmission buffer
645 * This function will automatically choose the right data type depending on
646 * the command payload length.
648 * Return: The number of bytes successfully transmitted or a negative error
651 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
652 const void *data, size_t len)
654 struct mipi_dsi_msg msg = {
655 .channel = dsi->channel,
665 msg.type = MIPI_DSI_DCS_SHORT_WRITE;
669 msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
673 msg.type = MIPI_DSI_DCS_LONG_WRITE;
677 return mipi_dsi_device_transfer(dsi, &msg);
679 EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer);
682 * mipi_dsi_dcs_write() - send DCS write command
683 * @dsi: DSI peripheral device
685 * @data: buffer containing the command payload
686 * @len: command payload length
688 * This function will automatically choose the right data type depending on
689 * the command payload length.
691 * Return: The number of bytes successfully transmitted or a negative error
694 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
695 const void *data, size_t len)
704 tx = kmalloc(size, GFP_KERNEL);
708 /* concatenate the DCS command byte and the payload */
710 memcpy(&tx[1], data, len);
716 err = mipi_dsi_dcs_write_buffer(dsi, tx, size);
723 EXPORT_SYMBOL(mipi_dsi_dcs_write);
726 * mipi_dsi_dcs_read() - send DCS read request command
727 * @dsi: DSI peripheral device
729 * @data: buffer in which to receive data
730 * @len: size of receive buffer
732 * Return: The number of bytes read or a negative error code on failure.
734 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
737 struct mipi_dsi_msg msg = {
738 .channel = dsi->channel,
739 .type = MIPI_DSI_DCS_READ,
746 return mipi_dsi_device_transfer(dsi, &msg);
748 EXPORT_SYMBOL(mipi_dsi_dcs_read);
751 * mipi_dsi_dcs_nop() - send DCS nop packet
752 * @dsi: DSI peripheral device
754 * Return: 0 on success or a negative error code on failure.
756 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi)
760 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0);
766 EXPORT_SYMBOL(mipi_dsi_dcs_nop);
769 * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
770 * @dsi: DSI peripheral device
772 * Return: 0 on success or a negative error code on failure.
774 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi)
778 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0);
784 EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset);
787 * mipi_dsi_dcs_get_power_mode() - query the display module's current power
789 * @dsi: DSI peripheral device
790 * @mode: return location for the current power mode
792 * Return: 0 on success or a negative error code on failure.
794 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
798 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode,
809 EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);
812 * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
813 * data used by the interface
814 * @dsi: DSI peripheral device
815 * @format: return location for the pixel format
817 * Return: 0 on success or a negative error code on failure.
819 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format)
823 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format,
834 EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format);
837 * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
838 * display module except interface communication
839 * @dsi: DSI peripheral device
841 * Return: 0 on success or a negative error code on failure.
843 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi)
847 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
853 EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode);
856 * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
858 * @dsi: DSI peripheral device
860 * Return: 0 on success or a negative error code on failure.
862 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi)
866 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0);
872 EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode);
875 * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
877 * @dsi: DSI peripheral device
879 * Return: 0 on success or a negative error code on failure.
881 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi)
885 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
891 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off);
894 * mipi_dsi_dcs_set_display_on() - start displaying the image data on the
896 * @dsi: DSI peripheral device
898 * Return: 0 on success or a negative error code on failure
900 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi)
904 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0);
910 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on);
913 * mipi_dsi_dcs_set_column_address() - define the column extent of the frame
914 * memory accessed by the host processor
915 * @dsi: DSI peripheral device
916 * @start: first column of frame memory
917 * @end: last column of frame memory
919 * Return: 0 on success or a negative error code on failure.
921 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
924 u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
927 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload,
934 EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address);
937 * mipi_dsi_dcs_set_page_address() - define the page extent of the frame
938 * memory accessed by the host processor
939 * @dsi: DSI peripheral device
940 * @start: first page of frame memory
941 * @end: last page of frame memory
943 * Return: 0 on success or a negative error code on failure.
945 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
948 u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
951 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload,
958 EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address);
961 * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
962 * output signal on the TE signal line
963 * @dsi: DSI peripheral device
965 * Return: 0 on success or a negative error code on failure
967 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi)
971 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0);
977 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off);
980 * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
981 * output signal on the TE signal line.
982 * @dsi: DSI peripheral device
983 * @mode: the Tearing Effect Output Line mode
985 * Return: 0 on success or a negative error code on failure
987 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
988 enum mipi_dsi_dcs_tear_mode mode)
993 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value,
1000 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
1003 * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
1004 * data used by the interface
1005 * @dsi: DSI peripheral device
1006 * @format: pixel format
1008 * Return: 0 on success or a negative error code on failure.
1010 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
1014 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format,
1021 EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
1024 * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for
1025 * the Tearing Effect output signal of the display module
1026 * @dsi: DSI peripheral device
1027 * @scanline: scanline to use as trigger
1029 * Return: 0 on success or a negative error code on failure
1031 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
1033 u8 payload[2] = { scanline >> 8, scanline & 0xff };
1036 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_SCANLINE, payload,
1043 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline);
1046 * mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the
1048 * @dsi: DSI peripheral device
1049 * @brightness: brightness value
1051 * Return: 0 on success or a negative error code on failure.
1053 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
1056 u8 payload[2] = { brightness & 0xff, brightness >> 8 };
1059 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
1060 payload, sizeof(payload));
1066 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness);
1069 * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value
1071 * @dsi: DSI peripheral device
1072 * @brightness: brightness value
1074 * Return: 0 on success or a negative error code on failure.
1076 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
1081 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
1082 brightness, sizeof(*brightness));
1092 EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness);
1095 * mipi_dsi_dcs_set_display_brightness_large() - sets the 16-bit brightness value
1097 * @dsi: DSI peripheral device
1098 * @brightness: brightness value
1100 * Return: 0 on success or a negative error code on failure.
1102 int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi,
1105 u8 payload[2] = { brightness >> 8, brightness & 0xff };
1108 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
1109 payload, sizeof(payload));
1115 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness_large);
1118 * mipi_dsi_dcs_get_display_brightness_large() - gets the current 16-bit
1119 * brightness value of the display
1120 * @dsi: DSI peripheral device
1121 * @brightness: brightness value
1123 * Return: 0 on success or a negative error code on failure.
1125 int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi,
1128 u8 brightness_be[2];
1131 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
1132 brightness_be, sizeof(brightness_be));
1140 *brightness = (brightness_be[0] << 8) | brightness_be[1];
1144 EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness_large);
1146 static int mipi_dsi_drv_probe(struct device *dev)
1148 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1149 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1151 return drv->probe(dsi);
1154 static int mipi_dsi_drv_remove(struct device *dev)
1156 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1157 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1159 return drv->remove(dsi);
1162 static void mipi_dsi_drv_shutdown(struct device *dev)
1164 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1165 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1171 * mipi_dsi_driver_register_full() - register a driver for DSI devices
1172 * @drv: DSI driver structure
1173 * @owner: owner module
1175 * Return: 0 on success or a negative error code on failure.
1177 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *drv,
1178 struct module *owner)
1180 drv->driver.bus = &mipi_dsi_bus_type;
1181 drv->driver.owner = owner;
1184 drv->driver.probe = mipi_dsi_drv_probe;
1186 drv->driver.remove = mipi_dsi_drv_remove;
1188 drv->driver.shutdown = mipi_dsi_drv_shutdown;
1190 return driver_register(&drv->driver);
1192 EXPORT_SYMBOL(mipi_dsi_driver_register_full);
1195 * mipi_dsi_driver_unregister() - unregister a driver for DSI devices
1196 * @drv: DSI driver structure
1198 * Return: 0 on success or a negative error code on failure.
1200 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv)
1202 driver_unregister(&drv->driver);
1204 EXPORT_SYMBOL(mipi_dsi_driver_unregister);
1206 static int __init mipi_dsi_bus_init(void)
1208 return bus_register(&mipi_dsi_bus_type);
1210 postcore_initcall(mipi_dsi_bus_init);
1212 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
1213 MODULE_DESCRIPTION("MIPI DSI Bus");
1214 MODULE_LICENSE("GPL and additional rights");