1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Media Bus API header
4  *
5  * Copyright (C) 2009, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
6  */
7 
8 #ifndef V4L2_MEDIABUS_H
9 #define V4L2_MEDIABUS_H
10 
11 #include <linux/v4l2-mediabus.h>
12 #include <linux/bitops.h>
13 
14 /*
15  * How to use the V4L2_MBUS_* flags:
16  * Flags are defined for each of the possible states and values of a media
17  * bus configuration parameter. One and only one bit of each group of flags
18  * shall be set by the users of the v4l2_subdev_pad_ops.get_mbus_config
19  * operation to ensure that no conflicting settings are specified when
20  * reporting the media bus configuration. For example, it is invalid to set or
21  * clear both the V4L2_MBUS_HSYNC_ACTIVE_HIGH and the
22  * V4L2_MBUS_HSYNC_ACTIVE_LOW flag at the same time. Instead either flag
23  * V4L2_MBUS_HSYNC_ACTIVE_HIGH or flag V4L2_MBUS_HSYNC_ACTIVE_LOW shall be set.
24  *
25  * TODO: replace the existing V4L2_MBUS_* flags with structures of fields
26  * to avoid conflicting settings.
27  *
28  * In example:
29  *     #define V4L2_MBUS_HSYNC_ACTIVE_HIGH             BIT(2)
30  *     #define V4L2_MBUS_HSYNC_ACTIVE_LOW              BIT(3)
31  * will be replaced by a field whose value reports the intended active state of
32  * the signal:
33  *     unsigned int v4l2_mbus_hsync_active : 1;
34  */
35 
36 /* Parallel flags */
37 /*
38  * The client runs in master or in slave mode. By "Master mode" an operation
39  * mode is meant, when the client (e.g., a camera sensor) is producing
40  * horizontal and vertical synchronisation. In "Slave mode" the host is
41  * providing these signals to the slave.
42  */
43 #define V4L2_MBUS_MASTER			BIT(0)
44 #define V4L2_MBUS_SLAVE				BIT(1)
45 /*
46  * Signal polarity flags
47  * Note: in BT.656 mode HSYNC, FIELD, and VSYNC are unused
48  * V4L2_MBUS_[HV]SYNC* flags should be also used for specifying
49  * configuration of hardware that uses [HV]REF signals
50  */
51 #define V4L2_MBUS_HSYNC_ACTIVE_HIGH		BIT(2)
52 #define V4L2_MBUS_HSYNC_ACTIVE_LOW		BIT(3)
53 #define V4L2_MBUS_VSYNC_ACTIVE_HIGH		BIT(4)
54 #define V4L2_MBUS_VSYNC_ACTIVE_LOW		BIT(5)
55 #define V4L2_MBUS_PCLK_SAMPLE_RISING		BIT(6)
56 #define V4L2_MBUS_PCLK_SAMPLE_FALLING		BIT(7)
57 #define V4L2_MBUS_DATA_ACTIVE_HIGH		BIT(8)
58 #define V4L2_MBUS_DATA_ACTIVE_LOW		BIT(9)
59 /* FIELD = 0/1 - Field1 (odd)/Field2 (even) */
60 #define V4L2_MBUS_FIELD_EVEN_HIGH		BIT(10)
61 /* FIELD = 1/0 - Field1 (odd)/Field2 (even) */
62 #define V4L2_MBUS_FIELD_EVEN_LOW		BIT(11)
63 /* Active state of Sync-on-green (SoG) signal, 0/1 for LOW/HIGH respectively. */
64 #define V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH		BIT(12)
65 #define V4L2_MBUS_VIDEO_SOG_ACTIVE_LOW		BIT(13)
66 #define V4L2_MBUS_DATA_ENABLE_HIGH		BIT(14)
67 #define V4L2_MBUS_DATA_ENABLE_LOW		BIT(15)
68 
69 /* Serial flags */
70 /* Clock non-continuous mode support. */
71 #define V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK	BIT(0)
72 
73 #define V4L2_MBUS_CSI2_MAX_DATA_LANES		8
74 
75 /**
76  * struct v4l2_mbus_config_mipi_csi2 - MIPI CSI-2 data bus configuration
77  * @flags: media bus (V4L2_MBUS_*) flags
78  * @data_lanes: an array of physical data lane indexes
79  * @clock_lane: physical lane index of the clock lane
80  * @num_data_lanes: number of data lanes
81  * @lane_polarities: polarity of the lanes. The order is the same of
82  *		   the physical lanes.
83  */
84 struct v4l2_mbus_config_mipi_csi2 {
85 	unsigned int flags;
86 	unsigned char data_lanes[V4L2_MBUS_CSI2_MAX_DATA_LANES];
87 	unsigned char clock_lane;
88 	unsigned char num_data_lanes;
89 	bool lane_polarities[1 + V4L2_MBUS_CSI2_MAX_DATA_LANES];
90 };
91 
92 /**
93  * struct v4l2_mbus_config_parallel - parallel data bus configuration
94  * @flags: media bus (V4L2_MBUS_*) flags
95  * @bus_width: bus width in bits
96  * @data_shift: data shift in bits
97  */
98 struct v4l2_mbus_config_parallel {
99 	unsigned int flags;
100 	unsigned char bus_width;
101 	unsigned char data_shift;
102 };
103 
104 /**
105  * struct v4l2_mbus_config_mipi_csi1 - CSI-1/CCP2 data bus configuration
106  * @clock_inv: polarity of clock/strobe signal
107  *	       false - not inverted, true - inverted
108  * @strobe: false - data/clock, true - data/strobe
109  * @lane_polarity: the polarities of the clock (index 0) and data lanes
110  *		   index (1)
111  * @data_lane: the number of the data lane
112  * @clock_lane: the number of the clock lane
113  */
114 struct v4l2_mbus_config_mipi_csi1 {
115 	unsigned char clock_inv:1;
116 	unsigned char strobe:1;
117 	bool lane_polarity[2];
118 	unsigned char data_lane;
119 	unsigned char clock_lane;
120 };
121 
122 /**
123  * enum v4l2_mbus_type - media bus type
124  * @V4L2_MBUS_UNKNOWN:	unknown bus type, no V4L2 mediabus configuration
125  * @V4L2_MBUS_PARALLEL:	parallel interface with hsync and vsync
126  * @V4L2_MBUS_BT656:	parallel interface with embedded synchronisation, can
127  *			also be used for BT.1120
128  * @V4L2_MBUS_CSI1:	MIPI CSI-1 serial interface
129  * @V4L2_MBUS_CCP2:	CCP2 (Compact Camera Port 2)
130  * @V4L2_MBUS_CSI2_DPHY: MIPI CSI-2 serial interface, with D-PHY
131  * @V4L2_MBUS_CSI2_CPHY: MIPI CSI-2 serial interface, with C-PHY
132  * @V4L2_MBUS_DPI:      MIPI VIDEO DPI interface
133  * @V4L2_MBUS_INVALID:	invalid bus type (keep as last)
134  */
135 enum v4l2_mbus_type {
136 	V4L2_MBUS_UNKNOWN,
137 	V4L2_MBUS_PARALLEL,
138 	V4L2_MBUS_BT656,
139 	V4L2_MBUS_CSI1,
140 	V4L2_MBUS_CCP2,
141 	V4L2_MBUS_CSI2_DPHY,
142 	V4L2_MBUS_CSI2_CPHY,
143 	V4L2_MBUS_DPI,
144 	V4L2_MBUS_INVALID,
145 };
146 
147 /**
148  * struct v4l2_mbus_config - media bus configuration
149  * @type: interface type
150  * @bus: bus configuration data structure
151  * @bus.parallel: embedded &struct v4l2_mbus_config_parallel.
152  *		  Used if the bus is parallel or BT.656.
153  * @bus.mipi_csi1: embedded &struct v4l2_mbus_config_mipi_csi1.
154  *		   Used if the bus is MIPI Alliance's Camera Serial
155  *		   Interface version 1 (MIPI CSI1) or Standard
156  *		   Mobile Imaging Architecture's Compact Camera Port 2
157  *		   (SMIA CCP2).
158  * @bus.mipi_csi2: embedded &struct v4l2_mbus_config_mipi_csi2.
159  *		   Used if the bus is MIPI Alliance's Camera Serial
160  *		   Interface version 2 (MIPI CSI2).
161  */
162 struct v4l2_mbus_config {
163 	enum v4l2_mbus_type type;
164 	union {
165 		struct v4l2_mbus_config_parallel parallel;
166 		struct v4l2_mbus_config_mipi_csi1 mipi_csi1;
167 		struct v4l2_mbus_config_mipi_csi2 mipi_csi2;
168 	} bus;
169 };
170 
171 /**
172  * v4l2_fill_pix_format - Ancillary routine that fills a &struct
173  *	v4l2_pix_format fields from a &struct v4l2_mbus_framefmt.
174  *
175  * @pix_fmt:	pointer to &struct v4l2_pix_format to be filled
176  * @mbus_fmt:	pointer to &struct v4l2_mbus_framefmt to be used as model
177  */
178 static inline void
v4l2_fill_pix_format(struct v4l2_pix_format * pix_fmt,const struct v4l2_mbus_framefmt * mbus_fmt)179 v4l2_fill_pix_format(struct v4l2_pix_format *pix_fmt,
180 		     const struct v4l2_mbus_framefmt *mbus_fmt)
181 {
182 	pix_fmt->width = mbus_fmt->width;
183 	pix_fmt->height = mbus_fmt->height;
184 	pix_fmt->field = mbus_fmt->field;
185 	pix_fmt->colorspace = mbus_fmt->colorspace;
186 	pix_fmt->ycbcr_enc = mbus_fmt->ycbcr_enc;
187 	pix_fmt->quantization = mbus_fmt->quantization;
188 	pix_fmt->xfer_func = mbus_fmt->xfer_func;
189 }
190 
191 /**
192  * v4l2_fill_mbus_format - Ancillary routine that fills a &struct
193  *	v4l2_mbus_framefmt from a &struct v4l2_pix_format and a
194  *	data format code.
195  *
196  * @mbus_fmt:	pointer to &struct v4l2_mbus_framefmt to be filled
197  * @pix_fmt:	pointer to &struct v4l2_pix_format to be used as model
198  * @code:	data format code (from &enum v4l2_mbus_pixelcode)
199  */
v4l2_fill_mbus_format(struct v4l2_mbus_framefmt * mbus_fmt,const struct v4l2_pix_format * pix_fmt,u32 code)200 static inline void v4l2_fill_mbus_format(struct v4l2_mbus_framefmt *mbus_fmt,
201 					 const struct v4l2_pix_format *pix_fmt,
202 			   u32 code)
203 {
204 	mbus_fmt->width = pix_fmt->width;
205 	mbus_fmt->height = pix_fmt->height;
206 	mbus_fmt->field = pix_fmt->field;
207 	mbus_fmt->colorspace = pix_fmt->colorspace;
208 	mbus_fmt->ycbcr_enc = pix_fmt->ycbcr_enc;
209 	mbus_fmt->quantization = pix_fmt->quantization;
210 	mbus_fmt->xfer_func = pix_fmt->xfer_func;
211 	mbus_fmt->code = code;
212 }
213 
214 /**
215  * v4l2_fill_pix_format_mplane - Ancillary routine that fills a &struct
216  *	v4l2_pix_format_mplane fields from a media bus structure.
217  *
218  * @pix_mp_fmt:	pointer to &struct v4l2_pix_format_mplane to be filled
219  * @mbus_fmt:	pointer to &struct v4l2_mbus_framefmt to be used as model
220  */
221 static inline void
v4l2_fill_pix_format_mplane(struct v4l2_pix_format_mplane * pix_mp_fmt,const struct v4l2_mbus_framefmt * mbus_fmt)222 v4l2_fill_pix_format_mplane(struct v4l2_pix_format_mplane *pix_mp_fmt,
223 			    const struct v4l2_mbus_framefmt *mbus_fmt)
224 {
225 	pix_mp_fmt->width = mbus_fmt->width;
226 	pix_mp_fmt->height = mbus_fmt->height;
227 	pix_mp_fmt->field = mbus_fmt->field;
228 	pix_mp_fmt->colorspace = mbus_fmt->colorspace;
229 	pix_mp_fmt->ycbcr_enc = mbus_fmt->ycbcr_enc;
230 	pix_mp_fmt->quantization = mbus_fmt->quantization;
231 	pix_mp_fmt->xfer_func = mbus_fmt->xfer_func;
232 }
233 
234 /**
235  * v4l2_fill_mbus_format_mplane - Ancillary routine that fills a &struct
236  *	v4l2_mbus_framefmt from a &struct v4l2_pix_format_mplane.
237  *
238  * @mbus_fmt:	pointer to &struct v4l2_mbus_framefmt to be filled
239  * @pix_mp_fmt:	pointer to &struct v4l2_pix_format_mplane to be used as model
240  */
241 static inline void
v4l2_fill_mbus_format_mplane(struct v4l2_mbus_framefmt * mbus_fmt,const struct v4l2_pix_format_mplane * pix_mp_fmt)242 v4l2_fill_mbus_format_mplane(struct v4l2_mbus_framefmt *mbus_fmt,
243 			     const struct v4l2_pix_format_mplane *pix_mp_fmt)
244 {
245 	mbus_fmt->width = pix_mp_fmt->width;
246 	mbus_fmt->height = pix_mp_fmt->height;
247 	mbus_fmt->field = pix_mp_fmt->field;
248 	mbus_fmt->colorspace = pix_mp_fmt->colorspace;
249 	mbus_fmt->ycbcr_enc = pix_mp_fmt->ycbcr_enc;
250 	mbus_fmt->quantization = pix_mp_fmt->quantization;
251 	mbus_fmt->xfer_func = pix_mp_fmt->xfer_func;
252 }
253 
254 #endif
255