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 return of_driver_match_device(dev
, drv
);
53 static const struct dev_pm_ops mipi_dsi_device_pm_ops
= {
54 .runtime_suspend
= pm_generic_runtime_suspend
,
55 .runtime_resume
= pm_generic_runtime_resume
,
56 .suspend
= pm_generic_suspend
,
57 .resume
= pm_generic_resume
,
58 .freeze
= pm_generic_freeze
,
59 .thaw
= pm_generic_thaw
,
60 .poweroff
= pm_generic_poweroff
,
61 .restore
= pm_generic_restore
,
64 static struct bus_type mipi_dsi_bus_type
= {
66 .match
= mipi_dsi_device_match
,
67 .pm
= &mipi_dsi_device_pm_ops
,
70 static int of_device_match(struct device
*dev
, void *data
)
72 return dev
->of_node
== data
;
76 * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
78 * @np: device tree node
80 * Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no
81 * such device exists (or has not been registered yet).
83 struct mipi_dsi_device
*of_find_mipi_dsi_device_by_node(struct device_node
*np
)
87 dev
= bus_find_device(&mipi_dsi_bus_type
, NULL
, np
, of_device_match
);
89 return dev
? to_mipi_dsi_device(dev
) : NULL
;
91 EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node
);
93 static void mipi_dsi_dev_release(struct device
*dev
)
95 struct mipi_dsi_device
*dsi
= to_mipi_dsi_device(dev
);
97 of_node_put(dev
->of_node
);
101 static const struct device_type mipi_dsi_device_type
= {
102 .release
= mipi_dsi_dev_release
,
105 static struct mipi_dsi_device
*mipi_dsi_device_alloc(struct mipi_dsi_host
*host
)
107 struct mipi_dsi_device
*dsi
;
109 dsi
= kzalloc(sizeof(*dsi
), GFP_KERNEL
);
111 return ERR_PTR(-ENOMEM
);
114 dsi
->dev
.bus
= &mipi_dsi_bus_type
;
115 dsi
->dev
.parent
= host
->dev
;
116 dsi
->dev
.type
= &mipi_dsi_device_type
;
118 device_initialize(&dsi
->dev
);
123 static int mipi_dsi_device_add(struct mipi_dsi_device
*dsi
)
125 struct mipi_dsi_host
*host
= dsi
->host
;
127 dev_set_name(&dsi
->dev
, "%s.%d", dev_name(host
->dev
), dsi
->channel
);
129 return device_add(&dsi
->dev
);
132 static struct mipi_dsi_device
*
133 of_mipi_dsi_device_add(struct mipi_dsi_host
*host
, struct device_node
*node
)
135 struct mipi_dsi_device
*dsi
;
136 struct device
*dev
= host
->dev
;
140 ret
= of_property_read_u32(node
, "reg", ®
);
142 dev_err(dev
, "device node %s has no valid reg property: %d\n",
143 node
->full_name
, ret
);
144 return ERR_PTR(-EINVAL
);
148 dev_err(dev
, "device node %s has invalid reg property: %u\n",
149 node
->full_name
, reg
);
150 return ERR_PTR(-EINVAL
);
153 dsi
= mipi_dsi_device_alloc(host
);
155 dev_err(dev
, "failed to allocate DSI device %s: %ld\n",
156 node
->full_name
, PTR_ERR(dsi
));
160 dsi
->dev
.of_node
= of_node_get(node
);
163 ret
= mipi_dsi_device_add(dsi
);
165 dev_err(dev
, "failed to add DSI device %s: %d\n",
166 node
->full_name
, ret
);
174 int mipi_dsi_host_register(struct mipi_dsi_host
*host
)
176 struct device_node
*node
;
178 for_each_available_child_of_node(host
->dev
->of_node
, node
) {
179 /* skip nodes without reg property */
180 if (!of_find_property(node
, "reg", NULL
))
182 of_mipi_dsi_device_add(host
, node
);
187 EXPORT_SYMBOL(mipi_dsi_host_register
);
189 static int mipi_dsi_remove_device_fn(struct device
*dev
, void *priv
)
191 struct mipi_dsi_device
*dsi
= to_mipi_dsi_device(dev
);
193 device_unregister(&dsi
->dev
);
198 void mipi_dsi_host_unregister(struct mipi_dsi_host
*host
)
200 device_for_each_child(host
->dev
, NULL
, mipi_dsi_remove_device_fn
);
202 EXPORT_SYMBOL(mipi_dsi_host_unregister
);
205 * mipi_dsi_attach - attach a DSI device to its DSI host
206 * @dsi: DSI peripheral
208 int mipi_dsi_attach(struct mipi_dsi_device
*dsi
)
210 const struct mipi_dsi_host_ops
*ops
= dsi
->host
->ops
;
212 if (!ops
|| !ops
->attach
)
215 return ops
->attach(dsi
->host
, dsi
);
217 EXPORT_SYMBOL(mipi_dsi_attach
);
220 * mipi_dsi_detach - detach a DSI device from its DSI host
221 * @dsi: DSI peripheral
223 int mipi_dsi_detach(struct mipi_dsi_device
*dsi
)
225 const struct mipi_dsi_host_ops
*ops
= dsi
->host
->ops
;
227 if (!ops
|| !ops
->detach
)
230 return ops
->detach(dsi
->host
, dsi
);
232 EXPORT_SYMBOL(mipi_dsi_detach
);
234 static ssize_t
mipi_dsi_device_transfer(struct mipi_dsi_device
*dsi
,
235 struct mipi_dsi_msg
*msg
)
237 const struct mipi_dsi_host_ops
*ops
= dsi
->host
->ops
;
239 if (!ops
|| !ops
->transfer
)
242 if (dsi
->mode_flags
& MIPI_DSI_MODE_LPM
)
243 msg
->flags
|= MIPI_DSI_MSG_USE_LPM
;
245 return ops
->transfer(dsi
->host
, msg
);
249 * mipi_dsi_packet_format_is_short - check if a packet is of the short format
250 * @type: MIPI DSI data type of the packet
252 * Return: true if the packet for the given data type is a short packet, false
255 bool mipi_dsi_packet_format_is_short(u8 type
)
258 case MIPI_DSI_V_SYNC_START
:
259 case MIPI_DSI_V_SYNC_END
:
260 case MIPI_DSI_H_SYNC_START
:
261 case MIPI_DSI_H_SYNC_END
:
262 case MIPI_DSI_END_OF_TRANSMISSION
:
263 case MIPI_DSI_COLOR_MODE_OFF
:
264 case MIPI_DSI_COLOR_MODE_ON
:
265 case MIPI_DSI_SHUTDOWN_PERIPHERAL
:
266 case MIPI_DSI_TURN_ON_PERIPHERAL
:
267 case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM
:
268 case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM
:
269 case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM
:
270 case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM
:
271 case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM
:
272 case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM
:
273 case MIPI_DSI_DCS_SHORT_WRITE
:
274 case MIPI_DSI_DCS_SHORT_WRITE_PARAM
:
275 case MIPI_DSI_DCS_READ
:
276 case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE
:
282 EXPORT_SYMBOL(mipi_dsi_packet_format_is_short
);
285 * mipi_dsi_packet_format_is_long - check if a packet is of the long format
286 * @type: MIPI DSI data type of the packet
288 * Return: true if the packet for the given data type is a long packet, false
291 bool mipi_dsi_packet_format_is_long(u8 type
)
294 case MIPI_DSI_NULL_PACKET
:
295 case MIPI_DSI_BLANKING_PACKET
:
296 case MIPI_DSI_GENERIC_LONG_WRITE
:
297 case MIPI_DSI_DCS_LONG_WRITE
:
298 case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20
:
299 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24
:
300 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16
:
301 case MIPI_DSI_PACKED_PIXEL_STREAM_30
:
302 case MIPI_DSI_PACKED_PIXEL_STREAM_36
:
303 case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12
:
304 case MIPI_DSI_PACKED_PIXEL_STREAM_16
:
305 case MIPI_DSI_PACKED_PIXEL_STREAM_18
:
306 case MIPI_DSI_PIXEL_STREAM_3BYTE_18
:
307 case MIPI_DSI_PACKED_PIXEL_STREAM_24
:
313 EXPORT_SYMBOL(mipi_dsi_packet_format_is_long
);
316 * mipi_dsi_create_packet - create a packet from a message according to the
318 * @packet: pointer to a DSI packet structure
319 * @msg: message to translate into a packet
321 * Return: 0 on success or a negative error code on failure.
323 int mipi_dsi_create_packet(struct mipi_dsi_packet
*packet
,
324 const struct mipi_dsi_msg
*msg
)
329 /* do some minimum sanity checking */
330 if (!mipi_dsi_packet_format_is_short(msg
->type
) &&
331 !mipi_dsi_packet_format_is_long(msg
->type
))
334 if (msg
->channel
> 3)
337 memset(packet
, 0, sizeof(*packet
));
338 packet
->header
[0] = ((msg
->channel
& 0x3) << 6) | (msg
->type
& 0x3f);
340 /* TODO: compute ECC if hardware support is not available */
343 * Long write packets contain the word count in header bytes 1 and 2.
344 * The payload follows the header and is word count bytes long.
346 * Short write packets encode up to two parameters in header bytes 1
349 if (mipi_dsi_packet_format_is_long(msg
->type
)) {
350 packet
->header
[1] = (msg
->tx_len
>> 0) & 0xff;
351 packet
->header
[2] = (msg
->tx_len
>> 8) & 0xff;
353 packet
->payload_length
= msg
->tx_len
;
354 packet
->payload
= msg
->tx_buf
;
356 const u8
*tx
= msg
->tx_buf
;
358 packet
->header
[1] = (msg
->tx_len
> 0) ? tx
[0] : 0;
359 packet
->header
[2] = (msg
->tx_len
> 1) ? tx
[1] : 0;
362 packet
->size
= sizeof(packet
->header
) + packet
->payload_length
;
366 EXPORT_SYMBOL(mipi_dsi_create_packet
);
369 * mipi_dsi_shutdown_peripheral() - sends a Shutdown Peripheral command
370 * @dsi: DSI peripheral device
372 * Return: 0 on success or a negative error code on failure.
374 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device
*dsi
)
376 struct mipi_dsi_msg msg
= {
377 .channel
= dsi
->channel
,
378 .type
= MIPI_DSI_SHUTDOWN_PERIPHERAL
,
379 .tx_buf
= (u8
[2]) { 0, 0 },
383 return mipi_dsi_device_transfer(dsi
, &msg
);
385 EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral
);
388 * mipi_dsi_turn_on_peripheral() - sends a Turn On Peripheral command
389 * @dsi: DSI peripheral device
391 * Return: 0 on success or a negative error code on failure.
393 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device
*dsi
)
395 struct mipi_dsi_msg msg
= {
396 .channel
= dsi
->channel
,
397 .type
= MIPI_DSI_TURN_ON_PERIPHERAL
,
398 .tx_buf
= (u8
[2]) { 0, 0 },
402 return mipi_dsi_device_transfer(dsi
, &msg
);
404 EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral
);
407 * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the
408 * the payload in a long packet transmitted from the peripheral back to the
410 * @dsi: DSI peripheral device
411 * @value: the maximum size of the payload
413 * Return: 0 on success or a negative error code on failure.
415 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device
*dsi
,
418 u8 tx
[2] = { value
& 0xff, value
>> 8 };
419 struct mipi_dsi_msg msg
= {
420 .channel
= dsi
->channel
,
421 .type
= MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE
,
422 .tx_len
= sizeof(tx
),
426 return mipi_dsi_device_transfer(dsi
, &msg
);
428 EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size
);
431 * mipi_dsi_generic_write() - transmit data using a generic write packet
432 * @dsi: DSI peripheral device
433 * @payload: buffer containing the payload
434 * @size: size of payload buffer
436 * This function will automatically choose the right data type depending on
437 * the payload length.
439 * Return: The number of bytes transmitted on success or a negative error code
442 ssize_t
mipi_dsi_generic_write(struct mipi_dsi_device
*dsi
, const void *payload
,
445 struct mipi_dsi_msg msg
= {
446 .channel
= dsi
->channel
,
453 msg
.type
= MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM
;
457 msg
.type
= MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM
;
461 msg
.type
= MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM
;
465 msg
.type
= MIPI_DSI_GENERIC_LONG_WRITE
;
469 return mipi_dsi_device_transfer(dsi
, &msg
);
471 EXPORT_SYMBOL(mipi_dsi_generic_write
);
474 * mipi_dsi_generic_read() - receive data using a generic read packet
475 * @dsi: DSI peripheral device
476 * @params: buffer containing the request parameters
477 * @num_params: number of request parameters
478 * @data: buffer in which to return the received data
479 * @size: size of receive buffer
481 * This function will automatically choose the right data type depending on
482 * the number of parameters passed in.
484 * Return: The number of bytes successfully read or a negative error code on
487 ssize_t
mipi_dsi_generic_read(struct mipi_dsi_device
*dsi
, const void *params
,
488 size_t num_params
, void *data
, size_t size
)
490 struct mipi_dsi_msg msg
= {
491 .channel
= dsi
->channel
,
492 .tx_len
= num_params
,
498 switch (num_params
) {
500 msg
.type
= MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM
;
504 msg
.type
= MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM
;
508 msg
.type
= MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM
;
515 return mipi_dsi_device_transfer(dsi
, &msg
);
517 EXPORT_SYMBOL(mipi_dsi_generic_read
);
520 * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
521 * @dsi: DSI peripheral device
522 * @data: buffer containing data to be transmitted
523 * @len: size of transmission buffer
525 * This function will automatically choose the right data type depending on
526 * the command payload length.
528 * Return: The number of bytes successfully transmitted or a negative error
531 ssize_t
mipi_dsi_dcs_write_buffer(struct mipi_dsi_device
*dsi
,
532 const void *data
, size_t len
)
534 struct mipi_dsi_msg msg
= {
535 .channel
= dsi
->channel
,
545 msg
.type
= MIPI_DSI_DCS_SHORT_WRITE
;
549 msg
.type
= MIPI_DSI_DCS_SHORT_WRITE_PARAM
;
553 msg
.type
= MIPI_DSI_DCS_LONG_WRITE
;
557 return mipi_dsi_device_transfer(dsi
, &msg
);
559 EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer
);
562 * mipi_dsi_dcs_write() - send DCS write command
563 * @dsi: DSI peripheral device
565 * @data: buffer containing the command payload
566 * @len: command payload length
568 * This function will automatically choose the right data type depending on
569 * the command payload length.
571 * Return: The number of bytes successfully transmitted or a negative error
574 ssize_t
mipi_dsi_dcs_write(struct mipi_dsi_device
*dsi
, u8 cmd
,
575 const void *data
, size_t len
)
584 tx
= kmalloc(size
, GFP_KERNEL
);
588 /* concatenate the DCS command byte and the payload */
590 memcpy(&tx
[1], data
, len
);
596 err
= mipi_dsi_dcs_write_buffer(dsi
, tx
, size
);
603 EXPORT_SYMBOL(mipi_dsi_dcs_write
);
606 * mipi_dsi_dcs_read() - send DCS read request command
607 * @dsi: DSI peripheral device
609 * @data: buffer in which to receive data
610 * @len: size of receive buffer
612 * Return: The number of bytes read or a negative error code on failure.
614 ssize_t
mipi_dsi_dcs_read(struct mipi_dsi_device
*dsi
, u8 cmd
, void *data
,
617 struct mipi_dsi_msg msg
= {
618 .channel
= dsi
->channel
,
619 .type
= MIPI_DSI_DCS_READ
,
626 return mipi_dsi_device_transfer(dsi
, &msg
);
628 EXPORT_SYMBOL(mipi_dsi_dcs_read
);
631 * mipi_dsi_dcs_nop() - send DCS nop packet
632 * @dsi: DSI peripheral device
634 * Return: 0 on success or a negative error code on failure.
636 int mipi_dsi_dcs_nop(struct mipi_dsi_device
*dsi
)
640 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_NOP
, NULL
, 0);
646 EXPORT_SYMBOL(mipi_dsi_dcs_nop
);
649 * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
650 * @dsi: DSI peripheral device
652 * Return: 0 on success or a negative error code on failure.
654 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device
*dsi
)
658 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_SOFT_RESET
, NULL
, 0);
664 EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset
);
667 * mipi_dsi_dcs_get_power_mode() - query the display module's current power
669 * @dsi: DSI peripheral device
670 * @mode: return location for the current power mode
672 * Return: 0 on success or a negative error code on failure.
674 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device
*dsi
, u8
*mode
)
678 err
= mipi_dsi_dcs_read(dsi
, MIPI_DCS_GET_POWER_MODE
, mode
,
689 EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode
);
692 * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
693 * data used by the interface
694 * @dsi: DSI peripheral device
695 * @format: return location for the pixel format
697 * Return: 0 on success or a negative error code on failure.
699 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device
*dsi
, u8
*format
)
703 err
= mipi_dsi_dcs_read(dsi
, MIPI_DCS_GET_PIXEL_FORMAT
, format
,
714 EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format
);
717 * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
718 * display module except interface communication
719 * @dsi: DSI peripheral device
721 * Return: 0 on success or a negative error code on failure.
723 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device
*dsi
)
727 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_ENTER_SLEEP_MODE
, NULL
, 0);
733 EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode
);
736 * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
738 * @dsi: DSI peripheral device
740 * Return: 0 on success or a negative error code on failure.
742 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device
*dsi
)
746 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_EXIT_SLEEP_MODE
, NULL
, 0);
752 EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode
);
755 * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
757 * @dsi: DSI peripheral device
759 * Return: 0 on success or a negative error code on failure.
761 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device
*dsi
)
765 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_SET_DISPLAY_OFF
, NULL
, 0);
771 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off
);
774 * mipi_dsi_dcs_set_display_on() - start displaying the image data on the
776 * @dsi: DSI peripheral device
778 * Return: 0 on success or a negative error code on failure
780 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device
*dsi
)
784 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_SET_DISPLAY_ON
, NULL
, 0);
790 EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on
);
793 * mipi_dsi_dcs_set_column_address() - define the column extent of the frame
794 * memory accessed by the host processor
795 * @dsi: DSI peripheral device
796 * @start: first column of frame memory
797 * @end: last column of frame memory
799 * Return: 0 on success or a negative error code on failure.
801 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device
*dsi
, u16 start
,
804 u8 payload
[4] = { start
>> 8, start
& 0xff, end
>> 8, end
& 0xff };
807 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_SET_COLUMN_ADDRESS
, payload
,
814 EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address
);
817 * mipi_dsi_dcs_set_page_address() - define the page extent of the frame
818 * memory accessed by the host processor
819 * @dsi: DSI peripheral device
820 * @start: first page of frame memory
821 * @end: last page of frame memory
823 * Return: 0 on success or a negative error code on failure.
825 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device
*dsi
, u16 start
,
828 u8 payload
[4] = { start
>> 8, start
& 0xff, end
>> 8, end
& 0xff };
831 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_SET_PAGE_ADDRESS
, payload
,
838 EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address
);
841 * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
842 * output signal on the TE signal line
843 * @dsi: DSI peripheral device
845 * Return: 0 on success or a negative error code on failure
847 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device
*dsi
)
851 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_SET_TEAR_OFF
, NULL
, 0);
857 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off
);
860 * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
861 * output signal on the TE signal line.
862 * @dsi: DSI peripheral device
863 * @mode: the Tearing Effect Output Line mode
865 * Return: 0 on success or a negative error code on failure
867 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device
*dsi
,
868 enum mipi_dsi_dcs_tear_mode mode
)
873 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_SET_TEAR_ON
, &value
,
880 EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on
);
883 * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
884 * data used by the interface
885 * @dsi: DSI peripheral device
886 * @format: pixel format
888 * Return: 0 on success or a negative error code on failure.
890 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device
*dsi
, u8 format
)
894 err
= mipi_dsi_dcs_write(dsi
, MIPI_DCS_SET_PIXEL_FORMAT
, &format
,
901 EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format
);
903 static int mipi_dsi_drv_probe(struct device
*dev
)
905 struct mipi_dsi_driver
*drv
= to_mipi_dsi_driver(dev
->driver
);
906 struct mipi_dsi_device
*dsi
= to_mipi_dsi_device(dev
);
908 return drv
->probe(dsi
);
911 static int mipi_dsi_drv_remove(struct device
*dev
)
913 struct mipi_dsi_driver
*drv
= to_mipi_dsi_driver(dev
->driver
);
914 struct mipi_dsi_device
*dsi
= to_mipi_dsi_device(dev
);
916 return drv
->remove(dsi
);
919 static void mipi_dsi_drv_shutdown(struct device
*dev
)
921 struct mipi_dsi_driver
*drv
= to_mipi_dsi_driver(dev
->driver
);
922 struct mipi_dsi_device
*dsi
= to_mipi_dsi_device(dev
);
928 * mipi_dsi_driver_register_full() - register a driver for DSI devices
929 * @drv: DSI driver structure
930 * @owner: owner module
932 * Return: 0 on success or a negative error code on failure.
934 int mipi_dsi_driver_register_full(struct mipi_dsi_driver
*drv
,
935 struct module
*owner
)
937 drv
->driver
.bus
= &mipi_dsi_bus_type
;
938 drv
->driver
.owner
= owner
;
941 drv
->driver
.probe
= mipi_dsi_drv_probe
;
943 drv
->driver
.remove
= mipi_dsi_drv_remove
;
945 drv
->driver
.shutdown
= mipi_dsi_drv_shutdown
;
947 return driver_register(&drv
->driver
);
949 EXPORT_SYMBOL(mipi_dsi_driver_register_full
);
952 * mipi_dsi_driver_unregister() - unregister a driver for DSI devices
953 * @drv: DSI driver structure
955 * Return: 0 on success or a negative error code on failure.
957 void mipi_dsi_driver_unregister(struct mipi_dsi_driver
*drv
)
959 driver_unregister(&drv
->driver
);
961 EXPORT_SYMBOL(mipi_dsi_driver_unregister
);
963 static int __init
mipi_dsi_bus_init(void)
965 return bus_register(&mipi_dsi_bus_type
);
967 postcore_initcall(mipi_dsi_bus_init
);
969 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
970 MODULE_DESCRIPTION("MIPI DSI Bus");
971 MODULE_LICENSE("GPL and additional rights");