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 * @attached: the DSI device has been successfully attached
172 * @name: DSI peripheral chip type
173 * @channel: virtual channel assigned to the peripheral
174 * @format: pixel format for video mode
175 * @lanes: number of active data lanes
176 * @mode_flags: DSI operation mode related flags
177 * @hs_rate: maximum lane frequency for high speed mode in hertz, this should
178 * be set to the real limits of the hardware, zero is only accepted for
179 * legacy drivers
180 * @lp_rate: maximum lane frequency for low power mode in hertz, this should
181 * be set to the real limits of the hardware, zero is only accepted for
182 * legacy drivers
183 * @dsc: panel/bridge DSC pps payload to be sent
184 */
185 struct mipi_dsi_device {
186 struct mipi_dsi_host *host;
187 struct device dev;
188 bool attached;
189
190 char name[DSI_DEV_NAME_SIZE];
191 unsigned int channel;
192 unsigned int lanes;
193 enum mipi_dsi_pixel_format format;
194 unsigned long mode_flags;
195 unsigned long hs_rate;
196 unsigned long lp_rate;
197 struct drm_dsc_config *dsc;
198 };
199
200 #define MIPI_DSI_MODULE_PREFIX "mipi-dsi:"
201
202 #define to_mipi_dsi_device(__dev) container_of_const(__dev, struct mipi_dsi_device, dev)
203
204 /**
205 * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any
206 * given pixel format defined by the MIPI DSI
207 * specification
208 * @fmt: MIPI DSI pixel format
209 *
210 * Returns: The number of bits per pixel of the given pixel format.
211 */
mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)212 static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)
213 {
214 switch (fmt) {
215 case MIPI_DSI_FMT_RGB888:
216 case MIPI_DSI_FMT_RGB666:
217 return 24;
218
219 case MIPI_DSI_FMT_RGB666_PACKED:
220 return 18;
221
222 case MIPI_DSI_FMT_RGB565:
223 return 16;
224 }
225
226 return -EINVAL;
227 }
228
229 struct mipi_dsi_device *
230 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
231 const struct mipi_dsi_device_info *info);
232 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi);
233 struct mipi_dsi_device *
234 devm_mipi_dsi_device_register_full(struct device *dev, struct mipi_dsi_host *host,
235 const struct mipi_dsi_device_info *info);
236 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
237 int mipi_dsi_attach(struct mipi_dsi_device *dsi);
238 int mipi_dsi_detach(struct mipi_dsi_device *dsi);
239 int devm_mipi_dsi_attach(struct device *dev, struct mipi_dsi_device *dsi);
240 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
241 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
242 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
243 u16 value);
244 ssize_t mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable);
245 ssize_t mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
246 const struct drm_dsc_picture_parameter_set *pps);
247
248 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
249 size_t size);
250 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
251 size_t num_params, void *data, size_t size);
252
253 /**
254 * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode
255 * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking
256 * information only
257 * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both
258 * V-Blanking and H-Blanking information
259 */
260 enum mipi_dsi_dcs_tear_mode {
261 MIPI_DSI_DCS_TEAR_MODE_VBLANK,
262 MIPI_DSI_DCS_TEAR_MODE_VHBLANK,
263 };
264
265 #define MIPI_DSI_DCS_POWER_MODE_DISPLAY (1 << 2)
266 #define MIPI_DSI_DCS_POWER_MODE_NORMAL (1 << 3)
267 #define MIPI_DSI_DCS_POWER_MODE_SLEEP (1 << 4)
268 #define MIPI_DSI_DCS_POWER_MODE_PARTIAL (1 << 5)
269 #define MIPI_DSI_DCS_POWER_MODE_IDLE (1 << 6)
270
271 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
272 const void *data, size_t len);
273 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
274 const void *data, size_t len);
275 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
276 size_t len);
277 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
278 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi);
279 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode);
280 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format);
281 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
282 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
283 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
284 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
285 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
286 u16 end);
287 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
288 u16 end);
289 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
290 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
291 enum mipi_dsi_dcs_tear_mode mode);
292 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
293 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline);
294 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
295 u16 brightness);
296 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
297 u16 *brightness);
298 int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi,
299 u16 brightness);
300 int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi,
301 u16 *brightness);
302
303 /**
304 * mipi_dsi_generic_write_seq - transmit data using a generic write packet
305 * @dsi: DSI peripheral device
306 * @seq: buffer containing the payload
307 */
308 #define mipi_dsi_generic_write_seq(dsi, seq...) \
309 do { \
310 static const u8 d[] = { seq }; \
311 struct device *dev = &dsi->dev; \
312 int ret; \
313 ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d)); \
314 if (ret < 0) { \
315 dev_err_ratelimited(dev, "transmit data failed: %d\n", \
316 ret); \
317 return ret; \
318 } \
319 } while (0)
320
321 /**
322 * mipi_dsi_dcs_write_seq - transmit a DCS command with payload
323 * @dsi: DSI peripheral device
324 * @cmd: Command
325 * @seq: buffer containing data to be transmitted
326 */
327 #define mipi_dsi_dcs_write_seq(dsi, cmd, seq...) \
328 do { \
329 static const u8 d[] = { cmd, seq }; \
330 struct device *dev = &dsi->dev; \
331 int ret; \
332 ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d)); \
333 if (ret < 0) { \
334 dev_err_ratelimited( \
335 dev, "sending command %#02x failed: %d\n", \
336 cmd, ret); \
337 return ret; \
338 } \
339 } while (0)
340
341 /**
342 * struct mipi_dsi_driver - DSI driver
343 * @driver: device driver model driver
344 * @probe: callback for device binding
345 * @remove: callback for device unbinding
346 * @shutdown: called at shutdown time to quiesce the device
347 */
348 struct mipi_dsi_driver {
349 struct device_driver driver;
350 int(*probe)(struct mipi_dsi_device *dsi);
351 void (*remove)(struct mipi_dsi_device *dsi);
352 void (*shutdown)(struct mipi_dsi_device *dsi);
353 };
354
355 static inline struct mipi_dsi_driver *
to_mipi_dsi_driver(struct device_driver * driver)356 to_mipi_dsi_driver(struct device_driver *driver)
357 {
358 return container_of(driver, struct mipi_dsi_driver, driver);
359 }
360
mipi_dsi_get_drvdata(const struct mipi_dsi_device * dsi)361 static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi)
362 {
363 return dev_get_drvdata(&dsi->dev);
364 }
365
mipi_dsi_set_drvdata(struct mipi_dsi_device * dsi,void * data)366 static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data)
367 {
368 dev_set_drvdata(&dsi->dev, data);
369 }
370
371 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *driver,
372 struct module *owner);
373 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver);
374
375 #define mipi_dsi_driver_register(driver) \
376 mipi_dsi_driver_register_full(driver, THIS_MODULE)
377
378 #define module_mipi_dsi_driver(__mipi_dsi_driver) \
379 module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \
380 mipi_dsi_driver_unregister)
381
382 #endif /* __DRM_MIPI_DSI__ */
383