aboutsummaryrefslogtreecommitdiff
path: root/include/media/soc_camera.h
blob: 26dede82057c077437eec1ceef8118d7147fbbc6 (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
237
238
239
240
241
242
243
244
245
246
247
248
249
250
/*
 * camera image capture (abstract) bus driver header
 *
 * Copyright (C) 2006, Sascha Hauer, Pengutronix
 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
 *
 * 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.
 */

#ifndef SOC_CAMERA_H
#define SOC_CAMERA_H

#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/videodev2.h>
#include <media/videobuf-core.h>

struct soc_camera_device {
	struct list_head list;
	struct device dev;
	struct device *control;
	unsigned short width;		/* Current window */
	unsigned short height;		/* sizes */
	unsigned short x_min;		/* Camera capabilities */
	unsigned short y_min;
	unsigned short x_current;	/* Current window location */
	unsigned short y_current;
	unsigned short width_min;
	unsigned short width_max;
	unsigned short height_min;
	unsigned short height_max;
	unsigned short y_skip_top;	/* Lines to skip at the top */
	unsigned short gain;
	unsigned short exposure;
	unsigned char iface;		/* Host number */
	unsigned char devnum;		/* Device number per host */
	unsigned char buswidth;		/* See comment in .c */
	struct soc_camera_sense *sense;	/* See comment in struct definition */
	struct soc_camera_ops *ops;
	struct video_device *vdev;
	const struct soc_camera_data_format *current_fmt;
	const struct soc_camera_data_format *formats;
	int num_formats;
	struct soc_camera_format_xlate *user_formats;
	int num_user_formats;
	struct module *owner;
	void *host_priv;		/* Per-device host private data */
	/* soc_camera.c private count. Only accessed with .video_lock held */
	int use_count;
	struct mutex video_lock;	/* Protects device data */
};

struct soc_camera_file {
	struct soc_camera_device *icd;
	struct videobuf_queue vb_vidq;
};

struct soc_camera_host {
	struct list_head list;
	struct device dev;
	unsigned char nr;				/* Host number */
	void *priv;
	const char *drv_name;
	struct soc_camera_host_ops *ops;
};

struct soc_camera_host_ops {
	struct module *owner;
	int (*add)(struct soc_camera_device *);
	void (*remove)(struct soc_camera_device *);
	int (*suspend)(struct soc_camera_device *, pm_message_t);
	int (*resume)(struct soc_camera_device *);
	int (*get_formats)(struct soc_camera_device *, int,
			   struct soc_camera_format_xlate *);
	int (*set_fmt)(struct soc_camera_device *, __u32, struct v4l2_rect *);
	int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
	void (*init_videobuf)(struct videobuf_queue *,
			      struct soc_camera_device *);
	int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
	int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
	int (*set_bus_param)(struct soc_camera_device *, __u32);
	unsigned int (*poll)(struct file *, poll_table *);
};

#define SOCAM_SENSOR_INVERT_PCLK	(1 << 0)
#define SOCAM_SENSOR_INVERT_MCLK	(1 << 1)
#define SOCAM_SENSOR_INVERT_HSYNC	(1 << 2)
#define SOCAM_SENSOR_INVERT_VSYNC	(1 << 3)
#define SOCAM_SENSOR_INVERT_DATA	(1 << 4)

struct soc_camera_link {
	/* Camera bus id, used to match a camera and a bus */
	int bus_id;
	/* GPIO number to switch between 8 and 10 bit modes */
	unsigned int gpio;
	/* Per camera SOCAM_SENSOR_* bus flags */
	unsigned long flags;
	/* Optional callbacks to power on or off and reset the sensor */
	int (*power)(struct device *, int);
	int (*reset)(struct device *);
};

static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)
{
	return container_of(dev, struct soc_camera_device, dev);
}

static inline struct soc_camera_host *to_soc_camera_host(struct device *dev)
{
	return container_of(dev, struct soc_camera_host, dev);
}

extern int soc_camera_host_register(struct soc_camera_host *ici);
extern void soc_camera_host_unregister(struct soc_camera_host *ici);
extern int soc_camera_device_register(struct soc_camera_device *icd);
extern void soc_camera_device_unregister(struct soc_camera_device *icd);

extern int soc_camera_video_start(struct soc_camera_device *icd);
extern void soc_camera_video_stop(struct soc_camera_device *icd);

extern const struct soc_camera_data_format *soc_camera_format_by_fourcc(
	struct soc_camera_device *icd, unsigned int fourcc);
extern const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
	struct soc_camera_device *icd, unsigned int fourcc);

struct soc_camera_data_format {
	const char *name;
	unsigned int depth;
	__u32 fourcc;
	enum v4l2_colorspace colorspace;
};

/**
 * struct soc_camera_format_xlate - match between host and sensor formats
 * @cam_fmt: sensor format provided by the sensor
 * @host_fmt: host format after host translation from cam_fmt
 * @buswidth: bus width for this format
 *
 * Host and sensor translation structure. Used in table of host and sensor
 * formats matchings in soc_camera_device. A host can override the generic list
 * generation by implementing get_formats(), and use it for format checks and
 * format setup.
 */
struct soc_camera_format_xlate {
	const struct soc_camera_data_format *cam_fmt;
	const struct soc_camera_data_format *host_fmt;
	unsigned char buswidth;
};

struct soc_camera_ops {
	struct module *owner;
	int (*probe)(struct soc_camera_device *);
	void (*remove)(struct soc_camera_device *);
	int (*suspend)(struct soc_camera_device *, pm_message_t state);
	int (*resume)(struct soc_camera_device *);
	int (*init)(struct soc_camera_device *);
	int (*release)(struct soc_camera_device *);
	int (*start_capture)(struct soc_camera_device *);
	int (*stop_capture)(struct soc_camera_device *);
	int (*set_fmt)(struct soc_camera_device *, __u32, struct v4l2_rect *);
	int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
	unsigned long (*query_bus_param)(struct soc_camera_device *);
	int (*set_bus_param)(struct soc_camera_device *, unsigned long);
	int (*get_chip_id)(struct soc_camera_device *,
			   struct v4l2_chip_ident *);
	int (*set_std)(struct soc_camera_device *, v4l2_std_id *);
#ifdef CONFIG_VIDEO_ADV_DEBUG
	int (*get_register)(struct soc_camera_device *, struct v4l2_register *);
	int (*set_register)(struct soc_camera_device *, struct v4l2_register *);
#endif
	int (*get_control)(struct soc_camera_device *, struct v4l2_control *);
	int (*set_control)(struct soc_camera_device *, struct v4l2_control *);
	const struct v4l2_queryctrl *controls;
	int num_controls;
};

#define SOCAM_SENSE_PCLK_CHANGED	(1 << 0)

/**
 * This struct can be attached to struct soc_camera_device by the host driver
 * to request sense from the camera, for example, when calling .set_fmt(). The
 * host then can check which flags are set and verify respective values if any.
 * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
 * changed during this operation. After completion the host should detach sense.
 *
 * @flags		ored SOCAM_SENSE_* flags
 * @master_clock	if the host wants to be informed about pixel-clock
 *			change, it better set master_clock.
 * @pixel_clock_max	maximum pixel clock frequency supported by the host,
 *			camera is not allowed to exceed this.
 * @pixel_clock		if the camera driver changed pixel clock during this
 *			operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
 *			master_clock to calculate the new pixel-clock and
 *			sets this field.
 */
struct soc_camera_sense {
	unsigned long flags;
	unsigned long master_clock;
	unsigned long pixel_clock_max;
	unsigned long pixel_clock;
};

static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
	struct soc_camera_ops *ops, int id)
{
	int i;

	for (i = 0; i < ops->num_controls; i++)
		if (ops->controls[i].id == id)
			return &ops->controls[i];

	return NULL;
}

#define SOCAM_MASTER			(1 << 0)
#define SOCAM_SLAVE			(1 << 1)
#define SOCAM_HSYNC_ACTIVE_HIGH		(1 << 2)
#define SOCAM_HSYNC_ACTIVE_LOW		(1 << 3)
#define SOCAM_VSYNC_ACTIVE_HIGH		(1 << 4)
#define SOCAM_VSYNC_ACTIVE_LOW		(1 << 5)
#define SOCAM_DATAWIDTH_8		(1 << 6)
#define SOCAM_DATAWIDTH_9		(1 << 7)
#define SOCAM_DATAWIDTH_10		(1 << 8)
#define SOCAM_DATAWIDTH_16		(1 << 9)
#define SOCAM_PCLK_SAMPLE_RISING	(1 << 10)
#define SOCAM_PCLK_SAMPLE_FALLING	(1 << 11)

#define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_9 | \
			      SOCAM_DATAWIDTH_10 | SOCAM_DATAWIDTH_16)

static inline unsigned long soc_camera_bus_param_compatible(
			unsigned long camera_flags, unsigned long bus_flags)
{
	unsigned long common_flags, hsync, vsync, pclk;

	common_flags = camera_flags & bus_flags;

	hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
	vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
	pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);

	return (!hsync || !vsync || !pclk) ? 0 : common_flags;
}

extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
						   unsigned long flags);

#endif