1 /* SPDX-License-Identifier: GPL-2.0-only */
5 * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
6 * Andrzej Hajda <a.hajda@samsung.com>
9 #ifndef __DRM_MIPI_DSI_H__
10 #define __DRM_MIPI_DSI_H__
12 #include <linux/device.h>
15 struct mipi_dsi_device;
17 /* request ACK from peripheral */
18 #define MIPI_DSI_MSG_REQ_ACK BIT(0)
19 /* use Low Power Mode to transmit message */
20 #define MIPI_DSI_MSG_USE_LPM BIT(1)
23 * struct mipi_dsi_msg - read/write DSI buffer
24 * @channel: virtual channel id
25 * @type: payload data type
26 * @flags: flags controlling this message transmission
27 * @tx_len: length of @tx_buf
28 * @tx_buf: data to be written
29 * @rx_len: length of @rx_buf
30 * @rx_buf: data to be read, or NULL
44 bool mipi_dsi_packet_format_is_short(u8 type);
45 bool mipi_dsi_packet_format_is_long(u8 type);
48 * struct mipi_dsi_packet - represents a MIPI DSI packet in protocol format
49 * @size: size (in bytes) of the packet
50 * @header: the four bytes that make up the header (Data ID, Word Count or
51 * Packet Data, and ECC)
52 * @payload_length: number of bytes in the payload
53 * @payload: a pointer to a buffer containing the payload, if any
55 struct mipi_dsi_packet {
58 size_t payload_length;
62 int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
63 const struct mipi_dsi_msg *msg);
66 * struct mipi_dsi_host_ops - DSI bus operations
67 * @attach: attach DSI device to DSI host
68 * @detach: detach DSI device from DSI host
69 * @transfer: transmit a DSI packet
71 * DSI packets transmitted by .transfer() are passed in as mipi_dsi_msg
72 * structures. This structure contains information about the type of packet
73 * being transmitted as well as the transmit and receive buffers. When an
74 * error is encountered during transmission, this function will return a
75 * negative error code. On success it shall return the number of bytes
76 * transmitted for write packets or the number of bytes received for read
79 * Note that typically DSI packet transmission is atomic, so the .transfer()
80 * function will seldomly return anything other than the number of bytes
81 * contained in the transmit buffer on success.
83 struct mipi_dsi_host_ops {
84 int (*attach)(struct mipi_dsi_host *host,
85 struct mipi_dsi_device *dsi);
86 int (*detach)(struct mipi_dsi_host *host,
87 struct mipi_dsi_device *dsi);
88 ssize_t (*transfer)(struct mipi_dsi_host *host,
89 const struct mipi_dsi_msg *msg);
93 * struct mipi_dsi_host - DSI host device
94 * @dev: driver model device node for this DSI host
95 * @ops: DSI host operations
96 * @list: list management
98 struct mipi_dsi_host {
100 const struct mipi_dsi_host_ops *ops;
101 struct list_head list;
104 int mipi_dsi_host_register(struct mipi_dsi_host *host);
105 void mipi_dsi_host_unregister(struct mipi_dsi_host *host);
106 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node);
111 #define MIPI_DSI_MODE_VIDEO BIT(0)
112 /* video burst mode */
113 #define MIPI_DSI_MODE_VIDEO_BURST BIT(1)
114 /* video pulse mode */
115 #define MIPI_DSI_MODE_VIDEO_SYNC_PULSE BIT(2)
116 /* enable auto vertical count mode */
117 #define MIPI_DSI_MODE_VIDEO_AUTO_VERT BIT(3)
118 /* enable hsync-end packets in vsync-pulse and v-porch area */
119 #define MIPI_DSI_MODE_VIDEO_HSE BIT(4)
120 /* disable hfront-porch area */
121 #define MIPI_DSI_MODE_VIDEO_HFP BIT(5)
122 /* disable hback-porch area */
123 #define MIPI_DSI_MODE_VIDEO_HBP BIT(6)
124 /* disable hsync-active area */
125 #define MIPI_DSI_MODE_VIDEO_HSA BIT(7)
126 /* flush display FIFO on vsync pulse */
127 #define MIPI_DSI_MODE_VSYNC_FLUSH BIT(8)
128 /* disable EoT packets in HS mode */
129 #define MIPI_DSI_MODE_EOT_PACKET BIT(9)
130 /* device supports non-continuous clock behavior (DSI spec 5.6.1) */
131 #define MIPI_DSI_CLOCK_NON_CONTINUOUS BIT(10)
132 /* transmit data in low power */
133 #define MIPI_DSI_MODE_LPM BIT(11)
135 enum mipi_dsi_pixel_format {
138 MIPI_DSI_FMT_RGB666_PACKED,
142 #define DSI_DEV_NAME_SIZE 20
145 * struct mipi_dsi_device_info - template for creating a mipi_dsi_device
146 * @type: DSI peripheral chip type
147 * @channel: DSI virtual channel assigned to peripheral
148 * @node: pointer to OF device node or NULL
150 * This is populated and passed to mipi_dsi_device_new to create a new
153 struct mipi_dsi_device_info {
154 char type[DSI_DEV_NAME_SIZE];
156 struct device_node *node;
160 * struct mipi_dsi_device - DSI peripheral device
161 * @host: DSI host for this peripheral
162 * @dev: driver model device node for this peripheral
163 * @attached: the DSI device has been successfully attached
164 * @name: DSI peripheral chip type
165 * @channel: virtual channel assigned to the peripheral
166 * @format: pixel format for video mode
167 * @lanes: number of active data lanes
168 * @mode_flags: DSI operation mode related flags
169 * @hs_rate: maximum lane frequency for high speed mode in hertz, this should
170 * be set to the real limits of the hardware, zero is only accepted for
172 * @lp_rate: maximum lane frequency for low power mode in hertz, this should
173 * be set to the real limits of the hardware, zero is only accepted for
176 struct mipi_dsi_device {
177 struct mipi_dsi_host *host;
181 char name[DSI_DEV_NAME_SIZE];
182 unsigned int channel;
184 enum mipi_dsi_pixel_format format;
185 unsigned long mode_flags;
186 unsigned long hs_rate;
187 unsigned long lp_rate;
190 #define MIPI_DSI_MODULE_PREFIX "mipi-dsi:"
192 static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
194 return container_of(dev, struct mipi_dsi_device, dev);
198 * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any
199 * given pixel format defined by the MIPI DSI
201 * @fmt: MIPI DSI pixel format
203 * Returns: The number of bits per pixel of the given pixel format.
205 static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)
208 case MIPI_DSI_FMT_RGB888:
209 case MIPI_DSI_FMT_RGB666:
212 case MIPI_DSI_FMT_RGB666_PACKED:
215 case MIPI_DSI_FMT_RGB565:
222 struct mipi_dsi_device *
223 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
224 const struct mipi_dsi_device_info *info);
225 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi);
226 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
227 int mipi_dsi_attach(struct mipi_dsi_device *dsi);
228 int mipi_dsi_detach(struct mipi_dsi_device *dsi);
229 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
230 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
231 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
234 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
236 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
237 size_t num_params, void *data, size_t size);
240 * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode
241 * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking
243 * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both
244 * V-Blanking and H-Blanking information
246 enum mipi_dsi_dcs_tear_mode {
247 MIPI_DSI_DCS_TEAR_MODE_VBLANK,
248 MIPI_DSI_DCS_TEAR_MODE_VHBLANK,
251 #define MIPI_DSI_DCS_POWER_MODE_DISPLAY (1 << 2)
252 #define MIPI_DSI_DCS_POWER_MODE_NORMAL (1 << 3)
253 #define MIPI_DSI_DCS_POWER_MODE_SLEEP (1 << 4)
254 #define MIPI_DSI_DCS_POWER_MODE_PARTIAL (1 << 5)
255 #define MIPI_DSI_DCS_POWER_MODE_IDLE (1 << 6)
257 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
258 const void *data, size_t len);
259 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
260 const void *data, size_t len);
261 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
263 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
264 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi);
265 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode);
266 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format);
267 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
268 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
269 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
270 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
271 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
273 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
275 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
276 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
277 enum mipi_dsi_dcs_tear_mode mode);
278 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
279 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline);
280 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
282 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
284 int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi,
286 int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi,
290 * struct mipi_dsi_driver - DSI driver
291 * @driver: device driver model driver
292 * @probe: callback for device binding
293 * @remove: callback for device unbinding
294 * @shutdown: called at shutdown time to quiesce the device
296 struct mipi_dsi_driver {
297 struct device_driver driver;
298 int(*probe)(struct mipi_dsi_device *dsi);
299 int(*remove)(struct mipi_dsi_device *dsi);
300 void (*shutdown)(struct mipi_dsi_device *dsi);
303 static inline struct mipi_dsi_driver *
304 to_mipi_dsi_driver(struct device_driver *driver)
306 return container_of(driver, struct mipi_dsi_driver, driver);
309 static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi)
311 return dev_get_drvdata(&dsi->dev);
314 static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data)
316 dev_set_drvdata(&dsi->dev, data);
319 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *driver,
320 struct module *owner);
321 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver);
323 #define mipi_dsi_driver_register(driver) \
324 mipi_dsi_driver_register_full(driver, THIS_MODULE)
326 #define module_mipi_dsi_driver(__mipi_dsi_driver) \
327 module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \
328 mipi_dsi_driver_unregister)
330 #endif /* __DRM_MIPI_DSI__ */