aboutsummaryrefslogtreecommitdiff
path: root/include/media/v4l2-int-device.h
blob: 861978deb3bfb59c9214ca660402e0b90b8b7095 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
/*
 * include/media/v4l2-int-device.h
 *
 * V4L2 internal ioctl interface.
 *
 * Copyright (C) 2007 Nokia Corporation.
 *
 * Contact: Sakari Ailus <sakari.ailus@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#ifndef V4L2_INT_DEVICE_H
#define V4L2_INT_DEVICE_H

#include <linux/module.h>
#include <media/v4l2-common.h>

#define V4L2NAMESIZE 32

/*
 *
 * The internal V4L2 device interface core.
 *
 */

enum v4l2_int_type {
	v4l2_int_type_master = 1,
	v4l2_int_type_slave
};

struct v4l2_int_device;

struct v4l2_int_master {
	int (*attach)(struct v4l2_int_device *master,
		      struct v4l2_int_device *slave);
	void (*detach)(struct v4l2_int_device *master);
};

typedef int (v4l2_int_ioctl_func)(struct v4l2_int_device *);
typedef int (v4l2_int_ioctl_func_0)(struct v4l2_int_device *);
typedef int (v4l2_int_ioctl_func_1)(struct v4l2_int_device *, void *);

struct v4l2_int_ioctl_desc {
	int num;
	v4l2_int_ioctl_func *func;
};

struct v4l2_int_slave {
	/* Don't touch master. */
	struct v4l2_int_device *master;

	char attach_to[V4L2NAMESIZE];

	int num_ioctls;
	struct v4l2_int_ioctl_desc *ioctls;
};

struct v4l2_int_device {
	/* Don't touch head. */
	struct list_head head;

	struct module *module;

	char name[V4L2NAMESIZE];

	enum v4l2_int_type type;
	union {
		struct v4l2_int_master *master;
		struct v4l2_int_slave *slave;
	} u;

	void *priv;
};

int v4l2_int_device_register(struct v4l2_int_device *d);
void v4l2_int_device_unregister(struct v4l2_int_device *d);

int v4l2_int_ioctl_0(struct v4l2_int_device *d, int cmd);
int v4l2_int_ioctl_1(struct v4l2_int_device *d, int cmd, void *arg);

/*
 *
 * Types and definitions for IOCTL commands.
 *
 */

/* Slave interface type. */
enum v4l2_if_type {
};

struct v4l2_ifparm {
	enum v4l2_if_type if_type;
	union {
	} u;
};

/* IOCTL command numbers. */
enum v4l2_int_ioctl_num {
	/*
	 *
	 * "Proper" V4L ioctls, as in struct video_device.
	 *
	 */
	vidioc_int_enum_fmt_cap_num = 1,
	vidioc_int_g_fmt_cap_num,
	vidioc_int_s_fmt_cap_num,
	vidioc_int_try_fmt_cap_num,
	vidioc_int_queryctrl_num,
	vidioc_int_g_ctrl_num,
	vidioc_int_s_ctrl_num,
	vidioc_int_g_parm_num,
	vidioc_int_s_parm_num,

	/*
	 *
	 * Strictly internal ioctls.
	 *
	 */
	/* Initialise the device when slave attaches to the master. */
	vidioc_int_dev_init_num = 1000,
	/* Delinitialise the device at slave detach. */
	vidioc_int_dev_exit_num,
	/* Set device power state: 0 is off, non-zero is on. */
	vidioc_int_s_power_num,
	/* Get slave interface parameters. */
	vidioc_int_g_ifparm_num,
	/* Get external clock speed for current slave settings. */
	vidioc_int_g_ext_clk_num,
	/*
	 * Tell what the generated interface clock speed actually is.
	 */
	vidioc_int_s_ext_clk_num,
	/* Does the slave need to be reset after VIDIOC_DQBUF? */
	vidioc_int_g_needs_reset_num,

	/*
	 *
	 * VIDIOC_INT_* ioctls.
	 *
	 */
	/* VIDIOC_INT_RESET */
	vidioc_int_reset_num,
	/* VIDIOC_INT_INIT */
	vidioc_int_init_num,
	/* VIDIOC_INT_G_CHIP_IDENT */
	vidioc_int_g_chip_ident_num,

	/*
	 *
	 * Start of private ioctls.
	 *
	 */
	vidioc_int_priv_start_num = 2000,
};

/*
 *
 * IOCTL wrapper functions for better type checking.
 *
 */

#define V4L2_INT_WRAPPER_0(name)					\
	static inline int vidioc_int_##name(struct v4l2_int_device *d)	\
	{								\
		return v4l2_int_ioctl_0(d, vidioc_int_##name##_num);	\
	}								\
									\
	static inline struct v4l2_int_ioctl_desc			\
	vidioc_int_##name##_cb(int (*func)				\
			       (struct v4l2_int_device *))		\
	{								\
		struct v4l2_int_ioctl_desc desc;			\
									\
		desc.num = vidioc_int_##name##_num;			\
		desc.func = (v4l2_int_ioctl_func *)func;		\
									\
		return desc;						\
	}

#define V4L2_INT_WRAPPER_1(name, arg_type, asterisk)			\
	static inline int vidioc_int_##name(struct v4l2_int_device *d,	\
					    arg_type asterisk arg)	\
	{								\
		return v4l2_int_ioctl_1(d, vidioc_int_##name##_num,	\
					(void *)(unsigned long)arg);	\
	}								\
									\
	static inline struct v4l2_int_ioctl_desc			\
	vidioc_int_##name##_cb(int (*func)				\
			       (struct v4l2_int_device *,		\
				arg_type asterisk))			\
	{								\
		struct v4l2_int_ioctl_desc desc;			\
									\
		desc.num = vidioc_int_##name##_num;			\
		desc.func = (v4l2_int_ioctl_func *)func;		\
									\
		return desc;						\
	}

V4L2_INT_WRAPPER_1(enum_fmt_cap, struct v4l2_fmtdesc, *);
V4L2_INT_WRAPPER_1(g_fmt_cap, struct v4l2_format, *);
V4L2_INT_WRAPPER_1(s_fmt_cap, struct v4l2_format, *);
V4L2_INT_WRAPPER_1(try_fmt_cap, struct v4l2_format, *);
V4L2_INT_WRAPPER_1(queryctrl, struct v4l2_queryctrl, *);
V4L2_INT_WRAPPER_1(g_ctrl, struct v4l2_control, *);
V4L2_INT_WRAPPER_1(s_ctrl, struct v4l2_control, *);
V4L2_INT_WRAPPER_1(g_parm, struct v4l2_streamparm, *);
V4L2_INT_WRAPPER_1(s_parm, struct v4l2_streamparm, *);

V4L2_INT_WRAPPER_0(dev_init);
V4L2_INT_WRAPPER_0(dev_exit);
V4L2_INT_WRAPPER_1(s_power, int, );
V4L2_INT_WRAPPER_1(g_ifparm, struct v4l2_ifparm, *);
V4L2_INT_WRAPPER_1(s_ext_clk, u32, );
V4L2_INT_WRAPPER_1(g_ext_clk, u32, *);
V4L2_INT_WRAPPER_1(g_needs_reset, void, *);

V4L2_INT_WRAPPER_0(reset);
V4L2_INT_WRAPPER_0(init);
V4L2_INT_WRAPPER_1(g_chip_ident, int, *);

#endif