1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * MIPI DSI Bus
4 *
5 * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
6 * Andrzej Hajda <a.hajda@samsung.com>
7 */
8
9 #ifndef __DRM_MIPI_DSI_H__
10 #define __DRM_MIPI_DSI_H__
11
12 #include <linux/device.h>
13
14 struct mipi_dsi_host;
15 struct mipi_dsi_device;
16 struct drm_dsc_picture_parameter_set;
17
18 /* request ACK from peripheral */
19 #define MIPI_DSI_MSG_REQ_ACK BIT(0)
20 /* use Low Power Mode to transmit message */
21 #define MIPI_DSI_MSG_USE_LPM BIT(1)
22
23 /**
24 * struct mipi_dsi_msg - read/write DSI buffer
25 * @channel: virtual channel id
26 * @type: payload data type
27 * @flags: flags controlling this message transmission
28 * @tx_len: length of @tx_buf
29 * @tx_buf: data to be written
30 * @rx_len: length of @rx_buf
31 * @rx_buf: data to be read, or NULL
32 */
33 struct mipi_dsi_msg {
34 u8 channel;
35 u8 type;
36 u16 flags;
37
38 size_t tx_len;
39 const void *tx_buf;
40
41 size_t rx_len;
42 void *rx_buf;
43 };
44
45 bool mipi_dsi_packet_format_is_short(u8 type);
46 bool mipi_dsi_packet_format_is_long(u8 type);
47
48 /**
49 * struct mipi_dsi_packet - represents a MIPI DSI packet in protocol format
50 * @size: size (in bytes) of the packet
51 * @header: the four bytes that make up the header (Data ID, Word Count or
52 * Packet Data, and ECC)
53 * @payload_length: number of bytes in the payload
54 * @payload: a pointer to a buffer containing the payload, if any
55 */
56 struct mipi_dsi_packet {
57 size_t size;
58 u8 header[4];
59 size_t payload_length;
60 const u8 *payload;
61 };
62
63 int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
64 const struct mipi_dsi_msg *msg);
65
66 /**
67 * struct mipi_dsi_host_ops - DSI bus operations
68 * @attach: attach DSI device to DSI host
69 * @detach: detach DSI device from DSI host
70 * @transfer: transmit a DSI packet
71 *
72 * DSI packets transmitted by .transfer() are passed in as mipi_dsi_msg
73 * structures. This structure contains information about the type of packet
74 * being transmitted as well as the transmit and receive buffers. When an
75 * error is encountered during transmission, this function will return a
76 * negative error code. On success it shall return the number of bytes
77 * transmitted for write packets or the number of bytes received for read
78 * packets.
79 *
80 * Note that typically DSI packet transmission is atomic, so the .transfer()
81 * function will seldomly return anything other than the number of bytes
82 * contained in the transmit buffer on success.
83 *
84 * Also note that those callbacks can be called no matter the state the
85 * host is in. Drivers that need the underlying device to be powered to
86 * perform these operations will first need to make sure it's been
87 * properly enabled.
88 */
89 struct mipi_dsi_host_ops {
90 int (*attach)(struct mipi_dsi_host *host,
91 struct mipi_dsi_device *dsi);
92 int (*detach)(struct mipi_dsi_host *host,
93 struct mipi_dsi_device *dsi);
94 ssize_t (*transfer)(struct mipi_dsi_host *host,
95 const struct mipi_dsi_msg *msg);
96 };
97
98 /**
99 * struct mipi_dsi_host - DSI host device
100 * @dev: driver model device node for this DSI host
101 * @ops: DSI host operations
102 * @list: list management
103 */
104 struct mipi_dsi_host {
105 struct device *dev;
106 const struct mipi_dsi_host_ops *ops;
107 struct list_head list;
108 };
109
110 int mipi_dsi_host_register(struct mipi_dsi_host *host);
111 void mipi_dsi_host_unregister(struct mipi_dsi_host *host);
112 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node);
113
114 /* DSI mode flags */
115
116 /* video mode */
117 #define MIPI_DSI_MODE_VIDEO BIT(0)
118 /* video burst mode */
119 #define MIPI_DSI_MODE_VIDEO_BURST BIT(1)
120 /* video pulse mode */
121 #define MIPI_DSI_MODE_VIDEO_SYNC_PULSE BIT(2)
122 /* enable auto vertical count mode */
123 #define MIPI_DSI_MODE_VIDEO_AUTO_VERT BIT(3)
124 /* enable hsync-end packets in vsync-pulse and v-porch area */
125 #define MIPI_DSI_MODE_VIDEO_HSE BIT(4)
126 /* disable hfront-porch area */
127 #define MIPI_DSI_MODE_VIDEO_NO_HFP BIT(5)
128 /* disable hback-porch area */
129 #define MIPI_DSI_MODE_VIDEO_NO_HBP BIT(6)
130 /* disable hsync-active area */
131 #define MIPI_DSI_MODE_VIDEO_NO_HSA BIT(7)
132 /* flush display FIFO on vsync pulse */
133 #define MIPI_DSI_MODE_VSYNC_FLUSH BIT(8)
134 /* disable EoT packets in HS mode */
135 #define MIPI_DSI_MODE_NO_EOT_PACKET BIT(9)
136 /* device supports non-continuous clock behavior (DSI spec 5.6.1) */
137 #define MIPI_DSI_CLOCK_NON_CONTINUOUS BIT(10)
138 /* transmit data in low power */
139 #define MIPI_DSI_MODE_LPM BIT(11)
140 /* transmit data ending at the same time for all lanes within one hsync */
141 #define MIPI_DSI_HS_PKT_END_ALIGNED BIT(12)
142
143 enum mipi_dsi_pixel_format {
144 MIPI_DSI_FMT_RGB888,
145 MIPI_DSI_FMT_RGB666,
146 MIPI_DSI_FMT_RGB666_PACKED,
147 MIPI_DSI_FMT_RGB565,
148 };
149
150 #define DSI_DEV_NAME_SIZE 20
151
152 /**
153 * struct mipi_dsi_device_info - template for creating a mipi_dsi_device
154 * @type: DSI peripheral chip type
155 * @channel: DSI virtual channel assigned to peripheral
156 * @node: pointer to OF device node or NULL
157 *
158 * This is populated and passed to mipi_dsi_device_new to create a new
159 * DSI device
160 */
161 struct mipi_dsi_device_info {
162 char type[DSI_DEV_NAME_SIZE];
163 u32 channel;
164 struct device_node *node;
165 };
166
167 /**
168 * struct mipi_dsi_device - DSI peripheral device
169 * @host: DSI host for this peripheral
170 * @dev: driver model device node for this peripheral
171 * @name: DSI peripheral chip type
172 * @channel: virtual channel assigned to the peripheral
173 * @format: pixel format for video mode
174 * @lanes: number of active data lanes
175 * @mode_flags: DSI operation mode related flags
176 * @hs_rate: maximum lane frequency for high speed mode in hertz, this should
177 * be set to the real limits of the hardware, zero is only accepted for
178 * legacy drivers
179 * @lp_rate: maximum lane frequency for low power mode in hertz, this should
180 * be set to the real limits of the hardware, zero is only accepted for
181 * legacy drivers
182 */
183 struct mipi_dsi_device {
184 struct mipi_dsi_host *host;
185 struct device dev;
186
187 char name[DSI_DEV_NAME_SIZE];
188 unsigned int channel;
189 unsigned int lanes;
190 enum mipi_dsi_pixel_format format;
191 unsigned long mode_flags;
192 unsigned long hs_rate;
193 unsigned long lp_rate;
194 };
195
196 #define MIPI_DSI_MODULE_PREFIX "mipi-dsi:"
197
to_mipi_dsi_device(struct device * dev)198 static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
199 {
200 return container_of(dev, struct mipi_dsi_device, dev);
201 }
202
203 /**
204 * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any
205 * given pixel format defined by the MIPI DSI
206 * specification
207 * @fmt: MIPI DSI pixel format
208 *
209 * Returns: The number of bits per pixel of the given pixel format.
210 */
mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)211 static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)
212 {
213 switch (fmt) {
214 case MIPI_DSI_FMT_RGB888:
215 case MIPI_DSI_FMT_RGB666:
216 return 24;
217
218 case MIPI_DSI_FMT_RGB666_PACKED:
219 return 18;
220
221 case MIPI_DSI_FMT_RGB565:
222 return 16;
223 }
224
225 return -EINVAL;
226 }
227
228 struct mipi_dsi_device *
229 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
230 const struct mipi_dsi_device_info *info);
231 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi);
232 struct mipi_dsi_device *
233 devm_mipi_dsi_device_register_full(struct device *dev, struct mipi_dsi_host *host,
234 const struct mipi_dsi_device_info *info);
235 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
236 int mipi_dsi_attach(struct mipi_dsi_device *dsi);
237 int mipi_dsi_detach(struct mipi_dsi_device *dsi);
238 int devm_mipi_dsi_attach(struct device *dev, struct mipi_dsi_device *dsi);
239 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
240 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
241 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
242 u16 value);
243 ssize_t mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable);
244 ssize_t mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
245 const struct drm_dsc_picture_parameter_set *pps);
246
247 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
248 size_t size);
249 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
250 size_t num_params, void *data, size_t size);
251
252 /**
253 * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode
254 * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking
255 * information only
256 * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both
257 * V-Blanking and H-Blanking information
258 */
259 enum mipi_dsi_dcs_tear_mode {
260 MIPI_DSI_DCS_TEAR_MODE_VBLANK,
261 MIPI_DSI_DCS_TEAR_MODE_VHBLANK,
262 };
263
264 #define MIPI_DSI_DCS_POWER_MODE_DISPLAY (1 << 2)
265 #define MIPI_DSI_DCS_POWER_MODE_NORMAL (1 << 3)
266 #define MIPI_DSI_DCS_POWER_MODE_SLEEP (1 << 4)
267 #define MIPI_DSI_DCS_POWER_MODE_PARTIAL (1 << 5)
268 #define MIPI_DSI_DCS_POWER_MODE_IDLE (1 << 6)
269
270 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
271 const void *data, size_t len);
272 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
273 const void *data, size_t len);
274 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
275 size_t len);
276 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
277 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi);
278 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode);
279 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format);
280 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
281 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
282 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
283 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
284 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
285 u16 end);
286 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
287 u16 end);
288 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
289 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
290 enum mipi_dsi_dcs_tear_mode mode);
291 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
292 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline);
293 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
294 u16 brightness);
295 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
296 u16 *brightness);
297
298 /**
299 * struct mipi_dsi_driver - DSI driver
300 * @driver: device driver model driver
301 * @probe: callback for device binding
302 * @remove: callback for device unbinding
303 * @shutdown: called at shutdown time to quiesce the device
304 */
305 struct mipi_dsi_driver {
306 struct device_driver driver;
307 int(*probe)(struct mipi_dsi_device *dsi);
308 int(*remove)(struct mipi_dsi_device *dsi);
309 void (*shutdown)(struct mipi_dsi_device *dsi);
310 };
311
312 static inline struct mipi_dsi_driver *
to_mipi_dsi_driver(struct device_driver * driver)313 to_mipi_dsi_driver(struct device_driver *driver)
314 {
315 return container_of(driver, struct mipi_dsi_driver, driver);
316 }
317
mipi_dsi_get_drvdata(const struct mipi_dsi_device * dsi)318 static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi)
319 {
320 return dev_get_drvdata(&dsi->dev);
321 }
322
mipi_dsi_set_drvdata(struct mipi_dsi_device * dsi,void * data)323 static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data)
324 {
325 dev_set_drvdata(&dsi->dev, data);
326 }
327
328 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *driver,
329 struct module *owner);
330 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver);
331
332 #define mipi_dsi_driver_register(driver) \
333 mipi_dsi_driver_register_full(driver, THIS_MODULE)
334
335 #define module_mipi_dsi_driver(__mipi_dsi_driver) \
336 module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \
337 mipi_dsi_driver_unregister)
338
339 #endif /* __DRM_MIPI_DSI__ */
340