aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/gspca/gspca.h
blob: f06253cd746901bfbeca0521e42c465db4241fa9 (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
#ifndef GSPCAV2_H
#define GSPCAV2_H

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <linux/mutex.h>



/* GSPCA debug codes */

#define D_PROBE  1
#define D_CONF   2
#define D_STREAM 3
#define D_FRAM   4
#define D_PACK   5
#define D_USBI   6
#define D_USBO   7

extern int gspca_debug;


#define PDEBUG(level, fmt, ...) \
	v4l2_dbg(level, gspca_debug, &gspca_dev->v4l2_dev, fmt, ##__VA_ARGS__)

#define PERR(fmt, ...) \
	v4l2_err(&gspca_dev->v4l2_dev, fmt, ##__VA_ARGS__)

#define GSPCA_MAX_FRAMES 16	/* maximum number of video frame buffers */
/* image transfers */
#define MAX_NURBS 4		/* max number of URBs */


/* used to list framerates supported by a camera mode (resolution) */
struct framerates {
	const u8 *rates;
	int nrates;
};

/* device information - set at probe time */
struct cam {
	const struct v4l2_pix_format *cam_mode;	/* size nmodes */
	const struct framerates *mode_framerates; /* must have size nmodes,
						   * just like cam_mode */
	u32 bulk_size;		/* buffer size when image transfer by bulk */
	u32 input_flags;	/* value for ENUM_INPUT status flags */
	u8 nmodes;		/* size of cam_mode */
	u8 no_urb_create;	/* don't create transfer URBs */
	u8 bulk_nurbs;		/* number of URBs in bulk mode
				 * - cannot be > MAX_NURBS
				 * - when 0 and bulk_size != 0 means
				 *   1 URB and submit done by subdriver */
	u8 bulk;		/* image transfer by 0:isoc / 1:bulk */
	u8 npkt;		/* number of packets in an ISOC message
				 * 0 is the default value: 32 packets */
	u8 needs_full_bandwidth;/* Set this flag to notify the bandwidth calc.
				 * code that the cam fills all image buffers to
				 * the max, even when using compression. */
};

struct gspca_dev;
struct gspca_frame;

/* subdriver operations */
typedef int (*cam_op) (struct gspca_dev *);
typedef void (*cam_v_op) (struct gspca_dev *);
typedef int (*cam_cf_op) (struct gspca_dev *, const struct usb_device_id *);
typedef int (*cam_get_jpg_op) (struct gspca_dev *,
				struct v4l2_jpegcompression *);
typedef int (*cam_set_jpg_op) (struct gspca_dev *,
				const struct v4l2_jpegcompression *);
typedef int (*cam_get_reg_op) (struct gspca_dev *,
				struct v4l2_dbg_register *);
typedef int (*cam_set_reg_op) (struct gspca_dev *,
				const struct v4l2_dbg_register *);
typedef int (*cam_chip_info_op) (struct gspca_dev *,
				struct v4l2_dbg_chip_info *);
typedef void (*cam_streamparm_op) (struct gspca_dev *,
				  struct v4l2_streamparm *);
typedef void (*cam_pkt_op) (struct gspca_dev *gspca_dev,
				u8 *data,
				int len);
typedef int (*cam_int_pkt_op) (struct gspca_dev *gspca_dev,
				u8 *data,
				int len);
typedef void (*cam_format_op) (struct gspca_dev *gspca_dev,
				struct v4l2_format *fmt);
typedef int (*cam_frmsize_op) (struct gspca_dev *gspca_dev,
				struct v4l2_frmsizeenum *fsize);

/* subdriver description */
struct sd_desc {
/* information */
	const char *name;	/* sub-driver name */
/* mandatory operations */
	cam_cf_op config;	/* called on probe */
	cam_op init;		/* called on probe and resume */
	cam_op init_controls;	/* called on probe */
	cam_op start;		/* called on stream on after URBs creation */
	cam_pkt_op pkt_scan;
/* optional operations */
	cam_op isoc_init;	/* called on stream on before getting the EP */
	cam_op isoc_nego;	/* called when URB submit failed with NOSPC */
	cam_v_op stopN;		/* called on stream off - main alt */
	cam_v_op stop0;		/* called on stream off & disconnect - alt 0 */
	cam_v_op dq_callback;	/* called when a frame has been dequeued */
	cam_get_jpg_op get_jcomp;
	cam_set_jpg_op set_jcomp;
	cam_streamparm_op get_streamparm;
	cam_streamparm_op set_streamparm;
	cam_format_op try_fmt;
	cam_frmsize_op enum_framesizes;
#ifdef CONFIG_VIDEO_ADV_DEBUG
	cam_set_reg_op set_register;
	cam_get_reg_op get_register;
	cam_chip_info_op get_chip_info;
#endif
#if IS_ENABLED(CONFIG_INPUT)
	cam_int_pkt_op int_pkt_scan;
	/* other_input makes the gspca core create gspca_dev->input even when
	   int_pkt_scan is NULL, for cams with non interrupt driven buttons */
	u8 other_input;
#endif
};

/* packet types when moving from iso buf to frame buf */
enum gspca_packet_type {
	DISCARD_PACKET,
	FIRST_PACKET,
	INTER_PACKET,
	LAST_PACKET
};

struct gspca_frame {
	__u8 *data;			/* frame buffer */
	int vma_use_count;
	struct v4l2_buffer v4l2_buf;
};

struct gspca_dev {
	struct video_device vdev;	/* !! must be the first item */
	struct module *module;		/* subdriver handling the device */
	struct v4l2_device v4l2_dev;
	struct usb_device *dev;
	struct file *capt_file;		/* file doing video capture */
					/* protected by queue_lock */
#if IS_ENABLED(CONFIG_INPUT)
	struct input_dev *input_dev;
	char phys[64];			/* physical device path */
#endif

	struct cam cam;				/* device information */
	const struct sd_desc *sd_desc;		/* subdriver description */
	struct v4l2_ctrl_handler ctrl_handler;

	/* autogain and exposure or gain control cluster, these are global as
	   the autogain/exposure functions in autogain_functions.c use them */
	struct {
		struct v4l2_ctrl *autogain;
		struct v4l2_ctrl *exposure;
		struct v4l2_ctrl *gain;
		int exp_too_low_cnt, exp_too_high_cnt;
	};

#define USB_BUF_SZ 64
	__u8 *usb_buf;				/* buffer for USB exchanges */
	struct urb *urb[MAX_NURBS];
#if IS_ENABLED(CONFIG_INPUT)
	struct urb *int_urb;
#endif

	__u8 *frbuf;				/* buffer for nframes */
	struct gspca_frame frame[GSPCA_MAX_FRAMES];
	u8 *image;				/* image beeing filled */
	__u32 frsz;				/* frame size */
	u32 image_len;				/* current length of image */
	atomic_t fr_q;				/* next frame to queue */
	atomic_t fr_i;				/* frame being filled */
	signed char fr_queue[GSPCA_MAX_FRAMES];	/* frame queue */
	char nframes;				/* number of frames */
	u8 fr_o;				/* next frame to dequeue */
	__u8 last_packet_type;
	__s8 empty_packet;		/* if (-1) don't check empty packets */
	__u8 streaming;			/* protected by both mutexes (*) */

	__u8 curr_mode;			/* current camera mode */
	struct v4l2_pix_format pixfmt;	/* current mode parameters */
	__u32 sequence;			/* frame sequence number */

	wait_queue_head_t wq;		/* wait queue */
	struct mutex usb_lock;		/* usb exchange protection */
	struct mutex queue_lock;	/* ISOC queue protection */
	int usb_err;			/* USB error - protected by usb_lock */
	u16 pkt_size;			/* ISOC packet size */
#ifdef CONFIG_PM
	char frozen;			/* suspend - resume */
#endif
	char present;			/* device connected */
	char nbufread;			/* number of buffers for read() */
	char memory;			/* memory type (V4L2_MEMORY_xxx) */
	__u8 iface;			/* USB interface number */
	__u8 alt;			/* USB alternate setting */
	int xfer_ep;			/* USB transfer endpoint address */
	u8 audio;			/* presence of audio device */

	/* (*) These variables are proteced by both usb_lock and queue_lock,
	   that is any code setting them is holding *both*, which means that
	   any code getting them needs to hold at least one of them */
};

int gspca_dev_probe(struct usb_interface *intf,
		const struct usb_device_id *id,
		const struct sd_desc *sd_desc,
		int dev_size,
		struct module *module);
int gspca_dev_probe2(struct usb_interface *intf,
		const struct usb_device_id *id,
		const struct sd_desc *sd_desc,
		int dev_size,
		struct module *module);
void gspca_disconnect(struct usb_interface *intf);
void gspca_frame_add(struct gspca_dev *gspca_dev,
			enum gspca_packet_type packet_type,
			const u8 *data,
			int len);
#ifdef CONFIG_PM
int gspca_suspend(struct usb_interface *intf, pm_message_t message);
int gspca_resume(struct usb_interface *intf);
#endif
int gspca_expo_autogain(struct gspca_dev *gspca_dev, int avg_lum,
	int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee);
int gspca_coarse_grained_expo_autogain(struct gspca_dev *gspca_dev,
        int avg_lum, int desired_avg_lum, int deadzone);

#endif /* GSPCAV2_H */

Privacy Policy