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 <drm/drm_dsc.h>
37 #include <drm/drm_print.h>
38 #include <video/mipi_display.h>
43 * These functions contain some common logic and helpers to deal with MIPI DSI
46 * Helpers are provided for a number of standard MIPI DSI command as well as a
47 * subset of the MIPI DCS command set.
50 static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv)
52 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
54 /* attempt OF style match */
55 if (of_driver_match_device(dev, drv))
58 /* compare DSI device and driver names */
59 if (!strcmp(dsi->name, drv->name))
65 static int mipi_dsi_uevent(struct device *dev, struct kobj_uevent_env *env)
67 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
70 err = of_device_uevent_modalias(dev, env);
74 add_uevent_var(env, "MODALIAS=%s%s", MIPI_DSI_MODULE_PREFIX,
80 static const struct dev_pm_ops mipi_dsi_device_pm_ops = {
81 .runtime_suspend = pm_generic_runtime_suspend,
82 .runtime_resume = pm_generic_runtime_resume,
83 .suspend = pm_generic_suspend,
84 .resume = pm_generic_resume,
85 .freeze = pm_generic_freeze,
86 .thaw = pm_generic_thaw,
87 .poweroff = pm_generic_poweroff,
88 .restore = pm_generic_restore,
91 static struct bus_type mipi_dsi_bus_type = {
93 .match = mipi_dsi_device_match,
94 .uevent = mipi_dsi_uevent,
95 .pm = &mipi_dsi_device_pm_ops,
99 * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
101 * @np: device tree node
103 * Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no
104 * such device exists (or has not been registered yet).
106 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np)
110 dev = bus_find_device_by_of_node(&mipi_dsi_bus_type, np);
112 return dev ? to_mipi_dsi_device(dev) : NULL;
114 EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node);
116 static void mipi_dsi_dev_release(struct device *dev)
118 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
120 of_node_put(dev->of_node);
124 static const struct device_type mipi_dsi_device_type = {
125 .release = mipi_dsi_dev_release,
128 static struct mipi_dsi_device *mipi_dsi_device_alloc(struct mipi_dsi_host *host)
130 struct mipi_dsi_device *dsi;
132 dsi = kzalloc(sizeof(*dsi), GFP_KERNEL);
134 return ERR_PTR(-ENOMEM);
137 dsi->dev.bus = &mipi_dsi_bus_type;
138 dsi->dev.parent = host->dev;
139 dsi->dev.type = &mipi_dsi_device_type;
141 device_initialize(&dsi->dev);
146 static int mipi_dsi_device_add(struct mipi_dsi_device *dsi)
148 struct mipi_dsi_host *host = dsi->host;
150 dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev), dsi->channel);
152 return device_add(&dsi->dev);
155 #if IS_ENABLED(CONFIG_OF)
156 static struct mipi_dsi_device *
157 of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
159 struct mipi_dsi_device_info info = { };
163 if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
164 drm_err(host, "modalias failure on %pOF\n", node);
165 return ERR_PTR(-EINVAL);
168 ret = of_property_read_u32(node, "reg", ®);
170 drm_err(host, "device node %pOF has no valid reg property: %d\n",
172 return ERR_PTR(-EINVAL);
176 info.node = of_node_get(node);
178 return mipi_dsi_device_register_full(host, &info);
181 static struct mipi_dsi_device *
182 of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
184 return ERR_PTR(-ENODEV);
189 * mipi_dsi_device_register_full - create a MIPI DSI device
190 * @host: DSI host to which this device is connected
191 * @info: pointer to template containing DSI device information
193 * Create a MIPI DSI device by using the device information provided by
194 * mipi_dsi_device_info template
197 * A pointer to the newly created MIPI DSI device, or, a pointer encoded
200 struct mipi_dsi_device *
201 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
202 const struct mipi_dsi_device_info *info)
204 struct mipi_dsi_device *dsi;
208 drm_err(host, "invalid mipi_dsi_device_info pointer\n");
209 return ERR_PTR(-EINVAL);
212 if (info->channel > 3) {
213 drm_err(host, "invalid virtual channel: %u\n", info->channel);
214 return ERR_PTR(-EINVAL);
217 dsi = mipi_dsi_device_alloc(host);
219 drm_err(host, "failed to allocate DSI device %ld\n",
224 device_set_node(&dsi->dev, of_fwnode_handle(info->node));
225 dsi->channel = info->channel;
226 strlcpy(dsi->name, info->type, sizeof(dsi->name));
228 ret = mipi_dsi_device_add(dsi);
230 drm_err(host, "failed to add DSI device %d\n", ret);
237 EXPORT_SYMBOL(mipi_dsi_device_register_full);
240 * mipi_dsi_device_unregister - unregister MIPI DSI device
241 * @dsi: DSI peripheral device
243 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi)
245 device_unregister(&dsi->dev);
247 EXPORT_SYMBOL(mipi_dsi_device_unregister);
249 static DEFINE_MUTEX(host_lock);
250 static LIST_HEAD(host_list);
253 * of_find_mipi_dsi_host_by_node() - find the MIPI DSI host matching a
255 * @node: device tree node
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).
261 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node)
263 struct mipi_dsi_host *host;
265 mutex_lock(&host_lock);
267 list_for_each_entry(host, &host_list, list) {
268 if (host->dev->of_node == node) {
269 mutex_unlock(&host_lock);
274 mutex_unlock(&host_lock);
278 EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node);
280 int mipi_dsi_host_register(struct mipi_dsi_host *host)
282 struct device_node *node;
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))
288 of_mipi_dsi_device_add(host, node);
291 mutex_lock(&host_lock);
292 list_add_tail(&host->list, &host_list);
293 mutex_unlock(&host_lock);
297 EXPORT_SYMBOL(mipi_dsi_host_register);
299 static int mipi_dsi_remove_device_fn(struct device *dev, void *priv)
301 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
304 mipi_dsi_detach(dsi);
305 mipi_dsi_device_unregister(dsi);
310 void mipi_dsi_host_unregister(struct mipi_dsi_host *host)
312 device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn);
314 mutex_lock(&host_lock);
315 list_del_init(&host->list);
316 mutex_unlock(&host_lock);
318 EXPORT_SYMBOL(mipi_dsi_host_unregister);
321 * mipi_dsi_attach - attach a DSI device to its DSI host
322 * @dsi: DSI peripheral
324 int mipi_dsi_attach(struct mipi_dsi_device *dsi)
326 const struct mipi_dsi_host_ops *ops = dsi->host->ops;
329 if (!ops || !ops->attach)
332 ret = ops->attach(dsi->host, dsi);
336 dsi->attached = true;
340 EXPORT_SYMBOL(mipi_dsi_attach);
343 * mipi_dsi_detach - detach a DSI device from its DSI host
344 * @dsi: DSI peripheral
346 int mipi_dsi_detach(struct mipi_dsi_device *dsi)
348 const struct mipi_dsi_host_ops *ops = dsi->host->ops;
350 if (WARN_ON(!dsi->attached))
353 if (!ops || !ops->detach)
356 dsi->attached = false;
358 return ops->detach(dsi->host, dsi);
360 EXPORT_SYMBOL(mipi_dsi_detach);
362 static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi,
363 struct mipi_dsi_msg *msg)
365 const struct mipi_dsi_host_ops *ops = dsi->host->ops;
367 if (!ops || !ops->transfer)
370 if (dsi->mode_flags & MIPI_DSI_MODE_LPM)
371 msg->flags |= MIPI_DSI_MSG_USE_LPM;
373 return ops->transfer(dsi->host, msg);
377 * mipi_dsi_packet_format_is_short - check if a packet is of the short format
378 * @type: MIPI DSI data type of the packet
380 * Return: true if the packet for the given data type is a short packet, false
383 bool mipi_dsi_packet_format_is_short(u8 type)
386 case MIPI_DSI_V_SYNC_START:
387 case MIPI_DSI_V_SYNC_END:
388 case MIPI_DSI_H_SYNC_START:
389 case MIPI_DSI_H_SYNC_END:
390 case MIPI_DSI_COMPRESSION_MODE:
391 case MIPI_DSI_END_OF_TRANSMISSION:
392 case MIPI_DSI_COLOR_MODE_OFF:
393 case MIPI_DSI_COLOR_MODE_ON:
394 case MIPI_DSI_SHUTDOWN_PERIPHERAL:
395 case MIPI_DSI_TURN_ON_PERIPHERAL:
396 case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
397 case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
398 case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
399 case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
400 case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
401 case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
402 case MIPI_DSI_DCS_SHORT_WRITE:
403 case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
404 case MIPI_DSI_DCS_READ:
405 case MIPI_DSI_EXECUTE_QUEUE:
406 case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
412 EXPORT_SYMBOL(mipi_dsi_packet_format_is_short);
415 * mipi_dsi_packet_format_is_long - check if a packet is of the long format
416 * @type: MIPI DSI data type of the packet
418 * Return: true if the packet for the given data type is a long packet, false
421 bool mipi_dsi_packet_format_is_long(u8 type)
424 case MIPI_DSI_NULL_PACKET:
425 case MIPI_DSI_BLANKING_PACKET:
426 case MIPI_DSI_GENERIC_LONG_WRITE:
427 case MIPI_DSI_DCS_LONG_WRITE:
428 case MIPI_DSI_PICTURE_PARAMETER_SET:
429 case MIPI_DSI_COMPRESSED_PIXEL_STREAM:
430 case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20:
431 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24:
432 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16:
433 case MIPI_DSI_PACKED_PIXEL_STREAM_30:
434 case MIPI_DSI_PACKED_PIXEL_STREAM_36:
435 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12:
436 case MIPI_DSI_PACKED_PIXEL_STREAM_16:
437 case MIPI_DSI_PACKED_PIXEL_STREAM_18:
438 case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
439 case MIPI_DSI_PACKED_PIXEL_STREAM_24:
445 EXPORT_SYMBOL(mipi_dsi_packet_format_is_long);
448 * mipi_dsi_create_packet - create a packet from a message according to the
450 * @packet: pointer to a DSI packet structure
451 * @msg: message to translate into a packet
453 * Return: 0 on success or a negative error code on failure.
455 int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
456 const struct mipi_dsi_msg *msg)
461 /* do some minimum sanity checking */
462 if (!mipi_dsi_packet_format_is_short(msg->type) &&
463 !mipi_dsi_packet_format_is_long(msg->type))
466 if (msg->channel > 3)
469 memset(packet, 0, sizeof(*packet));
470 packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f);
472 /* TODO: compute ECC if hardware support is not available */
475 * Long write packets contain the word count in header bytes 1 and 2.
476 * The payload follows the header and is word count bytes long.
478 * Short write packets encode up to two parameters in header bytes 1
481 if (mipi_dsi_packet_format_is_long(msg->type)) {
482 packet->header[1] = (msg->tx_len >> 0) & 0xff;
483 packet->header[2] = (msg->tx_len >> 8) & 0xff;
485 packet->payload_length = msg->tx_len;
486 packet->payload = msg->tx_buf;
488 const u8 *tx = msg->tx_buf;
490 packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0;
491 packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0;
494 packet->size = sizeof(packet->header) + packet->payload_length;
498 EXPORT_SYMBOL(mipi_dsi_create_packet);
501 * mipi_dsi_shutdown_peripheral() - sends a Shutdown Peripheral command
502 * @dsi: DSI peripheral device
504 * Return: 0 on success or a negative error code on failure.
506 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi)
508 struct mipi_dsi_msg msg = {
509 .channel = dsi->channel,
510 .type = MIPI_DSI_SHUTDOWN_PERIPHERAL,
511 .tx_buf = (u8 [2]) { 0, 0 },
514 int ret = mipi_dsi_device_transfer(dsi, &msg);
516 return (ret < 0) ? ret : 0;
518 EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral);
521 * mipi_dsi_turn_on_peripheral() - sends a Turn On Peripheral command
522 * @dsi: DSI peripheral device
524 * Return: 0 on success or a negative error code on failure.
526 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi)
528 struct mipi_dsi_msg msg = {
529 .channel = dsi->channel,
530 .type = MIPI_DSI_TURN_ON_PERIPHERAL,
531 .tx_buf = (u8 [2]) { 0, 0 },
534 int ret = mipi_dsi_device_transfer(dsi, &msg);
536 return (ret < 0) ? ret : 0;
538 EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral);
541 * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the
542 * the payload in a long packet transmitted from the peripheral back to the
544 * @dsi: DSI peripheral device
545 * @value: the maximum size of the payload
547 * Return: 0 on success or a negative error code on failure.
549 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
552 u8 tx[2] = { value & 0xff, value >> 8 };
553 struct mipi_dsi_msg msg = {
554 .channel = dsi->channel,
555 .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
556 .tx_len = sizeof(tx),
559 int ret = mipi_dsi_device_transfer(dsi, &msg);
561 return (ret < 0) ? ret : 0;
563 EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
566 * mipi_dsi_compression_mode() - enable/disable DSC on the peripheral
567 * @dsi: DSI peripheral device
568 * @enable: Whether to enable or disable the DSC
570 * Enable or disable Display Stream Compression on the peripheral using the
571 * default Picture Parameter Set and VESA DSC 1.1 algorithm.
573 * Return: 0 on success or a negative error code on failure.
575 int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable)
577 /* Note: Needs updating for non-default PPS or algorithm */
578 u8 tx[2] = { enable << 0, 0 };
579 struct mipi_dsi_msg msg = {
580 .channel = dsi->channel,
581 .type = MIPI_DSI_COMPRESSION_MODE,
582 .tx_len = sizeof(tx),
585 int ret = mipi_dsi_device_transfer(dsi, &msg);
587 return (ret < 0) ? ret : 0;
589 EXPORT_SYMBOL(mipi_dsi_compression_mode);
592 * mipi_dsi_picture_parameter_set() - transmit the DSC PPS to the peripheral
593 * @dsi: DSI peripheral device
594 * @pps: VESA DSC 1.1 Picture Parameter Set
596 * Transmit the VESA DSC 1.1 Picture Parameter Set to the peripheral.
598 * Return: 0 on success or a negative error code on failure.
600 int mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
601 const struct drm_dsc_picture_parameter_set *pps)
603 struct mipi_dsi_msg msg = {
604 .channel = dsi->channel,
605 .type = MIPI_DSI_PICTURE_PARAMETER_SET,
606 .tx_len = sizeof(*pps),
609 int ret = mipi_dsi_device_transfer(dsi, &msg);
611 return (ret < 0) ? ret : 0;
613 EXPORT_SYMBOL(mipi_dsi_picture_parameter_set);
616 * mipi_dsi_generic_write() - transmit data using a generic write packet
617 * @dsi: DSI peripheral device
618 * @payload: buffer containing the payload
619 * @size: size of payload buffer
621 * This function will automatically choose the right data type depending on
622 * the payload length.
624 * Return: The number of bytes transmitted on success or a negative error code
627 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
630 struct mipi_dsi_msg msg = {
631 .channel = dsi->channel,
638 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
642 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
646 msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
650 msg.type = MIPI_DSI_GENERIC_LONG_WRITE;
654 return mipi_dsi_device_transfer(dsi, &msg);
656 EXPORT_SYMBOL(mipi_dsi_generic_write);
659 * mipi_dsi_generic_read() - receive data using a generic read packet
660 * @dsi: DSI peripheral device
661 * @params: buffer containing the request parameters
662 * @num_params: number of request parameters
663 * @data: buffer in which to return the received data
664 * @size: size of receive buffer
666 * This function will automatically choose the right data type depending on
667 * the number of parameters passed in.
669 * Return: The number of bytes successfully read or a negative error code on
672 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
673 size_t num_params, void *data, size_t size)
675 struct mipi_dsi_msg msg = {
676 .channel = dsi->channel,
677 .tx_len = num_params,
683 switch (num_params) {
685 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
689 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
693 msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
700 return mipi_dsi_device_transfer(dsi, &msg);
702 EXPORT_SYMBOL(mipi_dsi_generic_read);
705 * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
706 * @dsi: DSI peripheral device
707 * @data: buffer containing data to be transmitted
708 * @len: size of transmission buffer
710 * This function will automatically choose the right data type depending on
711 * the command payload length.
713 * Return: The number of bytes successfully transmitted or a negative error
716 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
717 const void *data, size_t len)
719 struct mipi_dsi_msg msg = {
720 .channel = dsi->channel,
730 msg.type = MIPI_DSI_DCS_SHORT_WRITE;
734 msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
738 msg.type = MIPI_DSI_DCS_LONG_WRITE;
742 return mipi_dsi_device_transfer(dsi, &msg);
744 EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer);
747 * mipi_dsi_dcs_write() - send DCS write command
748 * @dsi: DSI peripheral device
750 * @data: buffer containing the command payload
751 * @len: command payload length
753 * This function will automatically choose the right data type depending on
754 * the command payload length.
756 * Return: The number of bytes successfully transmitted or a negative error
759 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
760 const void *data, size_t len)
768 if (len > ARRAY_SIZE(stack_tx) - 1) {
769 tx = kmalloc(size, GFP_KERNEL);
776 /* concatenate the DCS command byte and the payload */
779 memcpy(&tx[1], data, len);
781 err = mipi_dsi_dcs_write_buffer(dsi, tx, size);
788 EXPORT_SYMBOL(mipi_dsi_dcs_write);
791 * mipi_dsi_dcs_read() - send DCS read request command
792 * @dsi: DSI peripheral device
794 * @data: buffer in which to receive data
795 * @len: size of receive buffer
797 * Return: The number of bytes read or a negative error code on failure.
799 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
802 struct mipi_dsi_msg msg = {
803 .channel = dsi->channel,
804 .type = MIPI_DSI_DCS_READ,
811 return mipi_dsi_device_transfer(dsi, &msg);
813 EXPORT_SYMBOL(mipi_dsi_dcs_read);
816 * mipi_dsi_dcs_nop() - send DCS nop packet
817 * @dsi: DSI peripheral device
819 * Return: 0 on success or a negative error code on failure.
821 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi)
825 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0);
831 EXPORT_SYMBOL(mipi_dsi_dcs_nop);
834 * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
835 * @dsi: DSI peripheral device
837 * Return: 0 on success or a negative error code on failure.
839 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi)
843 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0);
849 EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset);
852 * mipi_dsi_dcs_get_power_mode() - query the display module's current power
854 * @dsi: DSI peripheral device
855 * @mode: return location for the current power mode
857 * Return: 0 on success or a negative error code on failure.
859 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
863 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode,
874 EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);
877 * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
878 * data used by the interface
879 * @dsi: DSI peripheral device
880 * @format: return location for the pixel format
882 * Return: 0 on success or a negative error code on failure.
884 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format)
888 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format,
899 EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format);
902 * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
903 * display module except interface communication
904 * @dsi: DSI peripheral device
906 * Return: 0 on success or a negative error code on failure.
908 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi)
912 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
918 EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode);
921 * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
923 * @dsi: DSI peripheral device
925 * Return: 0 on success or a negative error code on failure.
927 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi)
931 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0);
937 EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode);
940 * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
942 * @dsi: DSI peripheral device
944 * Return: 0 on success or a negative error code on failure.
946 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi)
950 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
956 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off);
959 * mipi_dsi_dcs_set_display_on() - start displaying the image data on the
961 * @dsi: DSI peripheral device
963 * Return: 0 on success or a negative error code on failure
965 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi)
969 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0);
975 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on);
978 * mipi_dsi_dcs_set_column_address() - define the column extent of the frame
979 * memory accessed by the host processor
980 * @dsi: DSI peripheral device
981 * @start: first column of frame memory
982 * @end: last column of frame memory
984 * Return: 0 on success or a negative error code on failure.
986 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
989 u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
992 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload,
999 EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address);
1002 * mipi_dsi_dcs_set_page_address() - define the page extent of the frame
1003 * memory accessed by the host processor
1004 * @dsi: DSI peripheral device
1005 * @start: first page of frame memory
1006 * @end: last page of frame memory
1008 * Return: 0 on success or a negative error code on failure.
1010 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
1013 u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
1016 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload,
1023 EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address);
1026 * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
1027 * output signal on the TE signal line
1028 * @dsi: DSI peripheral device
1030 * Return: 0 on success or a negative error code on failure
1032 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi)
1036 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0);
1042 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off);
1045 * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
1046 * output signal on the TE signal line.
1047 * @dsi: DSI peripheral device
1048 * @mode: the Tearing Effect Output Line mode
1050 * Return: 0 on success or a negative error code on failure
1052 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
1053 enum mipi_dsi_dcs_tear_mode mode)
1058 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value,
1065 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
1068 * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
1069 * data used by the interface
1070 * @dsi: DSI peripheral device
1071 * @format: pixel format
1073 * Return: 0 on success or a negative error code on failure.
1075 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
1079 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format,
1086 EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
1089 * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for
1090 * the Tearing Effect output signal of the display module
1091 * @dsi: DSI peripheral device
1092 * @scanline: scanline to use as trigger
1094 * Return: 0 on success or a negative error code on failure
1096 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
1098 u8 payload[2] = { scanline >> 8, scanline & 0xff };
1101 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_SCANLINE, payload,
1108 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline);
1111 * mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the
1113 * @dsi: DSI peripheral device
1114 * @brightness: brightness value
1116 * Return: 0 on success or a negative error code on failure.
1118 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
1121 u8 payload[2] = { brightness & 0xff, brightness >> 8 };
1124 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
1125 payload, sizeof(payload));
1131 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness);
1134 * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value
1136 * @dsi: DSI peripheral device
1137 * @brightness: brightness value
1139 * Return: 0 on success or a negative error code on failure.
1141 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
1146 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
1147 brightness, sizeof(*brightness));
1157 EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness);
1160 * mipi_dsi_dcs_set_display_brightness_large() - sets the 16-bit brightness value
1162 * @dsi: DSI peripheral device
1163 * @brightness: brightness value
1165 * Return: 0 on success or a negative error code on failure.
1167 int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi,
1170 u8 payload[2] = { brightness >> 8, brightness & 0xff };
1173 err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
1174 payload, sizeof(payload));
1180 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness_large);
1183 * mipi_dsi_dcs_get_display_brightness_large() - gets the current 16-bit
1184 * brightness value of the display
1185 * @dsi: DSI peripheral device
1186 * @brightness: brightness value
1188 * Return: 0 on success or a negative error code on failure.
1190 int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi,
1193 u8 brightness_be[2];
1196 err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
1197 brightness_be, sizeof(brightness_be));
1205 *brightness = (brightness_be[0] << 8) | brightness_be[1];
1209 EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness_large);
1211 static int mipi_dsi_drv_probe(struct device *dev)
1213 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1214 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1216 return drv->probe(dsi);
1219 static int mipi_dsi_drv_remove(struct device *dev)
1221 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1222 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1224 return drv->remove(dsi);
1227 static void mipi_dsi_drv_shutdown(struct device *dev)
1229 struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver);
1230 struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
1236 * mipi_dsi_driver_register_full() - register a driver for DSI devices
1237 * @drv: DSI driver structure
1238 * @owner: owner module
1240 * Return: 0 on success or a negative error code on failure.
1242 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *drv,
1243 struct module *owner)
1245 drv->driver.bus = &mipi_dsi_bus_type;
1246 drv->driver.owner = owner;
1249 drv->driver.probe = mipi_dsi_drv_probe;
1251 drv->driver.remove = mipi_dsi_drv_remove;
1253 drv->driver.shutdown = mipi_dsi_drv_shutdown;
1255 return driver_register(&drv->driver);
1257 EXPORT_SYMBOL(mipi_dsi_driver_register_full);
1260 * mipi_dsi_driver_unregister() - unregister a driver for DSI devices
1261 * @drv: DSI driver structure
1263 * Return: 0 on success or a negative error code on failure.
1265 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv)
1267 driver_unregister(&drv->driver);
1269 EXPORT_SYMBOL(mipi_dsi_driver_unregister);
1271 static int __init mipi_dsi_bus_init(void)
1273 return bus_register(&mipi_dsi_bus_type);
1275 postcore_initcall(mipi_dsi_bus_init);
1277 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
1278 MODULE_DESCRIPTION("MIPI DSI Bus");
1279 MODULE_LICENSE("GPL and additional rights");