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_DCS_COMPRESSION_MODE:
397 case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
403 EXPORT_SYMBOL(mipi_dsi_packet_format_is_short);
406 * mipi_dsi_packet_format_is_long - check if a packet is of the long format
407 * @type: MIPI DSI data type of the packet
409 * Return: true if the packet for the given data type is a long packet, false
412 bool mipi_dsi_packet_format_is_long(u8 type)
415 case MIPI_DSI_PPS_LONG_WRITE:
416 case MIPI_DSI_NULL_PACKET:
417 case MIPI_DSI_BLANKING_PACKET:
418 case MIPI_DSI_GENERIC_LONG_WRITE:
419 case MIPI_DSI_DCS_LONG_WRITE:
420 case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20:
421 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24:
422 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16:
423 case MIPI_DSI_PACKED_PIXEL_STREAM_30:
424 case MIPI_DSI_PACKED_PIXEL_STREAM_36:
425 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12:
426 case MIPI_DSI_PACKED_PIXEL_STREAM_16:
427 case MIPI_DSI_PACKED_PIXEL_STREAM_18:
428 case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
429 case MIPI_DSI_PACKED_PIXEL_STREAM_24:
435 EXPORT_SYMBOL(mipi_dsi_packet_format_is_long);
438 * mipi_dsi_create_packet - create a packet from a message according to the
440 * @packet: pointer to a DSI packet structure
441 * @msg: message to translate into a packet
443 * Return: 0 on success or a negative error code on failure.
445 int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
446 const struct mipi_dsi_msg *msg)
451 /* do some minimum sanity checking */
452 if (!mipi_dsi_packet_format_is_short(msg->type) &&
453 !mipi_dsi_packet_format_is_long(msg->type))
456 if (msg->channel > 3)
459 memset(packet, 0, sizeof(*packet));
460 packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f);
462 /* TODO: compute ECC if hardware support is not available */
465 * Long write packets contain the word count in header bytes 1 and 2.
466 * The payload follows the header and is word count bytes long.
468 * Short write packets encode up to two parameters in header bytes 1
471 if (mipi_dsi_packet_format_is_long(msg->type)) {
472 packet->header[1] = (msg->tx_len >> 0) & 0xff;
473 packet->header[2] = (msg->tx_len >> 8) & 0xff;
475 packet->payload_length = msg->tx_len;
476 packet->payload = msg->tx_buf;
478 const u8 *tx = msg->tx_buf;
480 packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0;
481 packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0;
484 packet->size = sizeof(packet->header) + packet->payload_length;
488 EXPORT_SYMBOL(mipi_dsi_create_packet);
491 * mipi_dsi_shutdown_peripheral() - sends a Shutdown Peripheral command
492 * @dsi: DSI peripheral device
494 * Return: 0 on success or a negative error code on failure.
496 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi)
498 struct mipi_dsi_msg msg = {
499 .channel = dsi->channel,
500 .type = MIPI_DSI_SHUTDOWN_PERIPHERAL,
501 .tx_buf = (u8 [2]) { 0, 0 },
504 int ret = mipi_dsi_device_transfer(dsi, &msg);
506 return (ret < 0) ? ret : 0;
508 EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral);
511 * mipi_dsi_turn_on_peripheral() - sends a Turn On Peripheral command
512 * @dsi: DSI peripheral device
514 * Return: 0 on success or a negative error code on failure.
516 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi)
518 struct mipi_dsi_msg msg = {
519 .channel = dsi->channel,
520 .type = MIPI_DSI_TURN_ON_PERIPHERAL,
521 .tx_buf = (u8 [2]) { 0, 0 },
524 int ret = mipi_dsi_device_transfer(dsi, &msg);
526 return (ret < 0) ? ret : 0;
528 EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral);
531 * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the
532 * the payload in a long packet transmitted from the peripheral back to the
534 * @dsi: DSI peripheral device
535 * @value: the maximum size of the payload
537 * Return: 0 on success or a negative error code on failure.
539 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
542 u8 tx[2] = { value & 0xff, value >> 8 };
543 struct mipi_dsi_msg msg = {
544 .channel = dsi->channel,
545 .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
546 .tx_len = sizeof(tx),
549 int ret = mipi_dsi_device_transfer(dsi, &msg);
551 return (ret < 0) ? ret : 0;
553 EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
556 * mipi_dsi_generic_write() - transmit data using a generic write packet
557 * @dsi: DSI peripheral device
558 * @payload: buffer containing the payload
559 * @size: size of payload buffer
561 * This function will automatically choose the right data type depending on
562 * the payload length.
564 * Return: The number of bytes transmitted on success or a negative error code
567 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
570 struct mipi_dsi_msg msg = {
571 .channel = dsi->channel,
578 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
582 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
586 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
590 msg.type = MIPI_DSI_GENERIC_LONG_WRITE;
594 return mipi_dsi_device_transfer(dsi, &msg);
596 EXPORT_SYMBOL(mipi_dsi_generic_write);
599 * mipi_dsi_generic_read() - receive data using a generic read packet
600 * @dsi: DSI peripheral device
601 * @params: buffer containing the request parameters
602 * @num_params: number of request parameters
603 * @data: buffer in which to return the received data
604 * @size: size of receive buffer
606 * This function will automatically choose the right data type depending on
607 * the number of parameters passed in.
609 * Return: The number of bytes successfully read or a negative error code on
612 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
613 size_t num_params, void *data, size_t size)
615 struct mipi_dsi_msg msg = {
616 .channel = dsi->channel,
617 .tx_len = num_params,
623 switch (num_params) {
625 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
629 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
633 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
640 return mipi_dsi_device_transfer(dsi, &msg);
642 EXPORT_SYMBOL(mipi_dsi_generic_read);
645 * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
646 * @dsi: DSI peripheral device
647 * @data: buffer containing data to be transmitted
648 * @len: size of transmission buffer
650 * This function will automatically choose the right data type depending on
651 * the command payload length.
653 * Return: The number of bytes successfully transmitted or a negative error
656 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
657 const void *data, size_t len)
659 struct mipi_dsi_msg msg = {
660 .channel = dsi->channel,
670 msg.type = MIPI_DSI_DCS_SHORT_WRITE;
674 msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
678 msg.type = MIPI_DSI_DCS_LONG_WRITE;
682 return mipi_dsi_device_transfer(dsi, &msg);
684 EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer);
687 * mipi_dsi_dcs_write() - send DCS write command
688 * @dsi: DSI peripheral device
690 * @data: buffer containing the command payload
691 * @len: command payload length
693 * This function will automatically choose the right data type depending on
694 * the command payload length.
696 * Return: The number of bytes successfully transmitted or a negative error
699 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
700 const void *data, size_t len)
709 tx = kmalloc(size, GFP_KERNEL);
713 /* concatenate the DCS command byte and the payload */
715 memcpy(&tx[1], data, len);
721 err = mipi_dsi_dcs_write_buffer(dsi, tx, size);
728 EXPORT_SYMBOL(mipi_dsi_dcs_write);
731 * mipi_dsi_dcs_read() - send DCS read request command
732 * @dsi: DSI peripheral device
734 * @data: buffer in which to receive data
735 * @len: size of receive buffer
737 * Return: The number of bytes read or a negative error code on failure.
739 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
742 struct mipi_dsi_msg msg = {
743 .channel = dsi->channel,
744 .type = MIPI_DSI_DCS_READ,
751 return mipi_dsi_device_transfer(dsi, &msg);
753 EXPORT_SYMBOL(mipi_dsi_dcs_read);
756 * mipi_dsi_dcs_nop() - send DCS nop packet
757 * @dsi: DSI peripheral device
759 * Return: 0 on success or a negative error code on failure.
761 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi)
765 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0);
771 EXPORT_SYMBOL(mipi_dsi_dcs_nop);
774 * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
775 * @dsi: DSI peripheral device
777 * Return: 0 on success or a negative error code on failure.
779 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi)
783 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0);
789 EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset);
792 * mipi_dsi_dcs_get_power_mode() - query the display module's current power
794 * @dsi: DSI peripheral device
795 * @mode: return location for the current power mode
797 * Return: 0 on success or a negative error code on failure.
799 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
803 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode,
814 EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);
817 * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
818 * data used by the interface
819 * @dsi: DSI peripheral device
820 * @format: return location for the pixel format
822 * Return: 0 on success or a negative error code on failure.
824 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format)
828 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format,
839 EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format);
842 * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
843 * display module except interface communication
844 * @dsi: DSI peripheral device
846 * Return: 0 on success or a negative error code on failure.
848 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi)
852 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
858 EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode);
861 * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
863 * @dsi: DSI peripheral device
865 * Return: 0 on success or a negative error code on failure.
867 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi)
871 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0);
877 EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode);
880 * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
882 * @dsi: DSI peripheral device
884 * Return: 0 on success or a negative error code on failure.
886 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi)
890 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
896 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off);
899 * mipi_dsi_dcs_set_display_on() - start displaying the image data on the
901 * @dsi: DSI peripheral device
903 * Return: 0 on success or a negative error code on failure
905 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi)
909 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0);
915 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on);
918 * mipi_dsi_dcs_set_column_address() - define the column extent of the frame
919 * memory accessed by the host processor
920 * @dsi: DSI peripheral device
921 * @start: first column of frame memory
922 * @end: last column of frame memory
924 * Return: 0 on success or a negative error code on failure.
926 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
929 u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
932 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload,
939 EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address);
942 * mipi_dsi_dcs_set_page_address() - define the page extent of the frame
943 * memory accessed by the host processor
944 * @dsi: DSI peripheral device
945 * @start: first page of frame memory
946 * @end: last page of frame memory
948 * Return: 0 on success or a negative error code on failure.
950 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
953 u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
956 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload,
963 EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address);
966 * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
967 * output signal on the TE signal line
968 * @dsi: DSI peripheral device
970 * Return: 0 on success or a negative error code on failure
972 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi)
976 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0);
982 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off);
985 * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
986 * output signal on the TE signal line.
987 * @dsi: DSI peripheral device
988 * @mode: the Tearing Effect Output Line mode
990 * Return: 0 on success or a negative error code on failure
992 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
993 enum mipi_dsi_dcs_tear_mode mode)
998 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value,
1005 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
1008 * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
1009 * data used by the interface
1010 * @dsi: DSI peripheral device
1011 * @format: pixel format
1013 * Return: 0 on success or a negative error code on failure.
1015 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
1019 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format,
1026 EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
1029 * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for
1030 * the Tearing Effect output signal of the display module
1031 * @dsi: DSI peripheral device
1032 * @scanline: scanline to use as trigger
1034 * Return: 0 on success or a negative error code on failure
1036 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
1038 u8 payload[2] = { scanline >> 8, scanline & 0xff };
1041 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_SCANLINE, payload,
1048 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline);
1051 * mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the
1053 * @dsi: DSI peripheral device
1054 * @brightness: brightness value
1056 * Return: 0 on success or a negative error code on failure.
1058 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
1061 u8 payload[2] = { brightness & 0xff, brightness >> 8 };
1064 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
1065 payload, sizeof(payload));
1071 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness);
1074 * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value
1076 * @dsi: DSI peripheral device
1077 * @brightness: brightness value
1079 * Return: 0 on success or a negative error code on failure.
1081 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
1086 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
1087 brightness, sizeof(*brightness));
1097 EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness);
1100 * mipi_dsi_dcs_set_display_brightness_large() - sets the 16-bit brightness value
1102 * @dsi: DSI peripheral device
1103 * @brightness: brightness value
1105 * Return: 0 on success or a negative error code on failure.
1107 int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi,
1110 u8 payload[2] = { brightness >> 8, brightness & 0xff };
1113 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
1114 payload, sizeof(payload));
1120 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness_large);
1123 * mipi_dsi_dcs_get_display_brightness_large() - gets the current 16-bit
1124 * brightness value of the display
1125 * @dsi: DSI peripheral device
1126 * @brightness: brightness value
1128 * Return: 0 on success or a negative error code on failure.
1130 int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi,
1133 u8 brightness_be[2];
1136 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
1137 brightness_be, sizeof(brightness_be));
1145 *brightness = (brightness_be[0] << 8) | brightness_be[1];
1149 EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness_large);
1151 static int mipi_dsi_drv_probe(struct device *dev)
1153 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1154 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1156 return drv->probe(dsi);
1159 static int mipi_dsi_drv_remove(struct device *dev)
1161 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1162 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1164 return drv->remove(dsi);
1167 static void mipi_dsi_drv_shutdown(struct device *dev)
1169 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1170 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1176 * mipi_dsi_driver_register_full() - register a driver for DSI devices
1177 * @drv: DSI driver structure
1178 * @owner: owner module
1180 * Return: 0 on success or a negative error code on failure.
1182 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *drv,
1183 struct module *owner)
1185 drv->driver.bus = &mipi_dsi_bus_type;
1186 drv->driver.owner = owner;
1189 drv->driver.probe = mipi_dsi_drv_probe;
1191 drv->driver.remove = mipi_dsi_drv_remove;
1193 drv->driver.shutdown = mipi_dsi_drv_shutdown;
1195 return driver_register(&drv->driver);
1197 EXPORT_SYMBOL(mipi_dsi_driver_register_full);
1200 * mipi_dsi_driver_unregister() - unregister a driver for DSI devices
1201 * @drv: DSI driver structure
1203 * Return: 0 on success or a negative error code on failure.
1205 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv)
1207 driver_unregister(&drv->driver);
1209 EXPORT_SYMBOL(mipi_dsi_driver_unregister);
1211 static int __init mipi_dsi_bus_init(void)
1213 return bus_register(&mipi_dsi_bus_type);
1215 postcore_initcall(mipi_dsi_bus_init);
1217 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
1218 MODULE_DESCRIPTION("MIPI DSI Bus");
1219 MODULE_LICENSE("GPL and additional rights");