2 * camera image capture (abstract) bus driver header
4 * Copyright (C) 2006, Sascha Hauer, Pengutronix
5 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
15 #include <linux/videodev2.h>
16 #include <media/videobuf-core.h>
19 struct soc_camera_device {
20 struct list_head list;
22 struct device *control;
23 unsigned short width; /* Current window */
24 unsigned short height; /* sizes */
25 unsigned short x_min; /* Camera capabilities */
27 unsigned short x_current; /* Current window location */
28 unsigned short y_current;
29 unsigned short width_min;
30 unsigned short width_max;
31 unsigned short height_min;
32 unsigned short height_max;
33 unsigned short y_skip_top; /* Lines to skip at the top */
35 unsigned short exposure;
36 unsigned char iface; /* Host number */
37 unsigned char devnum; /* Device number per host */
38 unsigned char buswidth; /* See comment in .c */
39 struct soc_camera_ops *ops;
40 struct video_device *vdev;
41 const struct soc_camera_data_format *current_fmt;
42 const struct soc_camera_data_format *formats;
44 struct soc_camera_format_xlate *user_formats;
47 void *host_priv; /* per-device host private data */
48 /* soc_camera.c private count. Only accessed with video_lock held */
52 struct soc_camera_file {
53 struct soc_camera_device *icd;
54 struct videobuf_queue vb_vidq;
57 struct soc_camera_host {
58 struct list_head list;
60 unsigned char nr; /* Host number */
63 struct soc_camera_host_ops *ops;
66 struct soc_camera_host_ops {
68 int (*add)(struct soc_camera_device *);
69 void (*remove)(struct soc_camera_device *);
70 int (*suspend)(struct soc_camera_device *, pm_message_t);
71 int (*resume)(struct soc_camera_device *);
72 int (*get_formats)(struct soc_camera_device *, int,
73 struct soc_camera_format_xlate *);
74 int (*set_fmt)(struct soc_camera_device *, __u32, struct v4l2_rect *);
75 int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
76 void (*init_videobuf)(struct videobuf_queue *,
77 struct soc_camera_device *);
78 int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
79 int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
80 int (*set_bus_param)(struct soc_camera_device *, __u32);
81 unsigned int (*poll)(struct file *, poll_table *);
84 struct soc_camera_link {
85 /* Camera bus id, used to match a camera and a bus */
87 /* GPIO number to switch between 8 and 10 bit modes */
89 /* Optional callbacks to power on or off and reset the sensor */
90 int (*power)(struct device *, int);
91 int (*reset)(struct device *);
94 static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)
96 return container_of(dev, struct soc_camera_device, dev);
99 static inline struct soc_camera_host *to_soc_camera_host(struct device *dev)
101 return container_of(dev, struct soc_camera_host, dev);
104 extern int soc_camera_host_register(struct soc_camera_host *ici);
105 extern void soc_camera_host_unregister(struct soc_camera_host *ici);
106 extern int soc_camera_device_register(struct soc_camera_device *icd);
107 extern void soc_camera_device_unregister(struct soc_camera_device *icd);
109 extern int soc_camera_video_start(struct soc_camera_device *icd);
110 extern void soc_camera_video_stop(struct soc_camera_device *icd);
112 extern const struct soc_camera_data_format *soc_camera_format_by_fourcc(
113 struct soc_camera_device *icd, unsigned int fourcc);
114 extern const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
115 struct soc_camera_device *icd, unsigned int fourcc);
117 struct soc_camera_data_format {
121 enum v4l2_colorspace colorspace;
125 * struct soc_camera_format_xlate - match between host and sensor formats
126 * @cam_fmt: sensor format provided by the sensor
127 * @host_fmt: host format after host translation from cam_fmt
128 * @buswidth: bus width for this format
130 * Host and sensor translation structure. Used in table of host and sensor
131 * formats matchings in soc_camera_device. A host can override the generic list
132 * generation by implementing get_formats(), and use it for format checks and
135 struct soc_camera_format_xlate {
136 const struct soc_camera_data_format *cam_fmt;
137 const struct soc_camera_data_format *host_fmt;
138 unsigned char buswidth;
141 struct soc_camera_ops {
142 struct module *owner;
143 int (*probe)(struct soc_camera_device *);
144 void (*remove)(struct soc_camera_device *);
145 int (*suspend)(struct soc_camera_device *, pm_message_t state);
146 int (*resume)(struct soc_camera_device *);
147 int (*init)(struct soc_camera_device *);
148 int (*release)(struct soc_camera_device *);
149 int (*start_capture)(struct soc_camera_device *);
150 int (*stop_capture)(struct soc_camera_device *);
151 int (*set_fmt)(struct soc_camera_device *, __u32, struct v4l2_rect *);
152 int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
153 unsigned long (*query_bus_param)(struct soc_camera_device *);
154 int (*set_bus_param)(struct soc_camera_device *, unsigned long);
155 int (*get_chip_id)(struct soc_camera_device *,
156 struct v4l2_chip_ident *);
157 #ifdef CONFIG_VIDEO_ADV_DEBUG
158 int (*get_register)(struct soc_camera_device *, struct v4l2_register *);
159 int (*set_register)(struct soc_camera_device *, struct v4l2_register *);
161 int (*get_control)(struct soc_camera_device *, struct v4l2_control *);
162 int (*set_control)(struct soc_camera_device *, struct v4l2_control *);
163 const struct v4l2_queryctrl *controls;
167 static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
168 struct soc_camera_ops *ops, int id)
172 for (i = 0; i < ops->num_controls; i++)
173 if (ops->controls[i].id == id)
174 return &ops->controls[i];
179 #define SOCAM_MASTER (1 << 0)
180 #define SOCAM_SLAVE (1 << 1)
181 #define SOCAM_HSYNC_ACTIVE_HIGH (1 << 2)
182 #define SOCAM_HSYNC_ACTIVE_LOW (1 << 3)
183 #define SOCAM_VSYNC_ACTIVE_HIGH (1 << 4)
184 #define SOCAM_VSYNC_ACTIVE_LOW (1 << 5)
185 #define SOCAM_DATAWIDTH_8 (1 << 6)
186 #define SOCAM_DATAWIDTH_9 (1 << 7)
187 #define SOCAM_DATAWIDTH_10 (1 << 8)
188 #define SOCAM_DATAWIDTH_16 (1 << 9)
189 #define SOCAM_PCLK_SAMPLE_RISING (1 << 10)
190 #define SOCAM_PCLK_SAMPLE_FALLING (1 << 11)
192 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_9 | \
193 SOCAM_DATAWIDTH_10 | SOCAM_DATAWIDTH_16)
195 static inline unsigned long soc_camera_bus_param_compatible(
196 unsigned long camera_flags, unsigned long bus_flags)
198 unsigned long common_flags, hsync, vsync, pclk;
200 common_flags = camera_flags & bus_flags;
202 hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
203 vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
204 pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
206 return (!hsync || !vsync || !pclk) ? 0 : common_flags;