include/media/soc_camera.h

   1 /*
   2  * camera image capture (abstract) bus driver header
   3  *
   4  * Copyright (C) 2006, Sascha Hauer, Pengutronix
   5  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
   6  *
   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.
  10  */
  11
  12 #ifndef SOC_CAMERA_H
  13 #define SOC_CAMERA_H
  14
  15 #include <linux/videodev2.h>
  16 #include <media/videobuf-core.h>
  17
  18 struct soc_camera_device {
  19         struct list_head list;
  20         struct device dev;
  21         struct device *control;
  22         unsigned short width;           /* Current window */
  23         unsigned short height;          /* sizes */
  24         unsigned short x_min;           /* Camera capabilities */
  25         unsigned short y_min;
  26         unsigned short x_current;       /* Current window location */
  27         unsigned short y_current;
  28         unsigned short width_min;
  29         unsigned short width_max;
  30         unsigned short height_min;
  31         unsigned short height_max;
  32         unsigned short y_skip_top;      /* Lines to skip at the top */
  33         unsigned short gain;
  34         unsigned short exposure;
  35         unsigned char iface;            /* Host number */
  36         unsigned char devnum;           /* Device number per host */
  37         unsigned char buswidth;         /* See comment in .c */
  38         struct soc_camera_ops *ops;
  39         struct video_device *vdev;
  40         const struct soc_camera_data_format *current_fmt;
  41         const struct soc_camera_data_format *formats;
  42         int num_formats;
  43         struct module *owner;
  44         /* soc_camera.c private count. Only accessed with video_lock held */
  45         int use_count;
  46 };
  47
  48 struct soc_camera_file {
  49         struct soc_camera_device *icd;
  50         struct videobuf_queue vb_vidq;
  51 };
  52
  53 struct soc_camera_host {
  54         struct list_head list;
  55         struct device dev;
  56         unsigned char nr;                               /* Host number */
  57         void *priv;
  58         char *drv_name;
  59         struct soc_camera_host_ops *ops;
  60 };
  61
  62 struct soc_camera_host_ops {
  63         struct module *owner;
  64         int (*add)(struct soc_camera_device *);
  65         void (*remove)(struct soc_camera_device *);
  66         int (*set_fmt_cap)(struct soc_camera_device *, __u32,
  67                            struct v4l2_rect *);
  68         int (*try_fmt_cap)(struct soc_camera_device *, struct v4l2_format *);
  69         void (*init_videobuf)(struct videobuf_queue *,
  70                               struct soc_camera_device *);
  71         int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
  72         int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
  73         int (*try_bus_param)(struct soc_camera_device *, __u32);
  74         int (*set_bus_param)(struct soc_camera_device *, __u32);
  75         unsigned int (*poll)(struct file *, poll_table *);
  76 };
  77
  78 struct soc_camera_link {
  79         /* Camera bus id, used to match a camera and a bus */
  80         int bus_id;
  81         /* GPIO number to switch between 8 and 10 bit modes */
  82         unsigned int gpio;
  83 };
  84
  85 static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)
  86 {
  87         return container_of(dev, struct soc_camera_device, dev);
  88 }
  89
  90 static inline struct soc_camera_host *to_soc_camera_host(struct device *dev)
  91 {
  92         return container_of(dev, struct soc_camera_host, dev);
  93 }
  94
  95 extern int soc_camera_host_register(struct soc_camera_host *ici);
  96 extern void soc_camera_host_unregister(struct soc_camera_host *ici);
  97 extern int soc_camera_device_register(struct soc_camera_device *icd);
  98 extern void soc_camera_device_unregister(struct soc_camera_device *icd);
  99
 100 extern int soc_camera_video_start(struct soc_camera_device *icd);
 101 extern void soc_camera_video_stop(struct soc_camera_device *icd);
 102
 103 struct soc_camera_data_format {
 104         char *name;
 105         unsigned int depth;
 106         __u32 fourcc;
 107         enum v4l2_colorspace colorspace;
 108 };
 109
 110 struct soc_camera_ops {
 111         struct module *owner;
 112         int (*probe)(struct soc_camera_device *);
 113         void (*remove)(struct soc_camera_device *);
 114         int (*init)(struct soc_camera_device *);
 115         int (*release)(struct soc_camera_device *);
 116         int (*start_capture)(struct soc_camera_device *);
 117         int (*stop_capture)(struct soc_camera_device *);
 118         int (*set_fmt_cap)(struct soc_camera_device *, __u32,
 119                            struct v4l2_rect *);
 120         int (*try_fmt_cap)(struct soc_camera_device *, struct v4l2_format *);
 121         unsigned long (*query_bus_param)(struct soc_camera_device *);
 122         int (*set_bus_param)(struct soc_camera_device *, unsigned long);
 123         int (*get_chip_id)(struct soc_camera_device *,
 124                            struct v4l2_chip_ident *);
 125 #ifdef CONFIG_VIDEO_ADV_DEBUG
 126         int (*get_register)(struct soc_camera_device *, struct v4l2_register *);
 127         int (*set_register)(struct soc_camera_device *, struct v4l2_register *);
 128 #endif
 129         int (*get_control)(struct soc_camera_device *, struct v4l2_control *);
 130         int (*set_control)(struct soc_camera_device *, struct v4l2_control *);
 131         const struct v4l2_queryctrl *controls;
 132         int num_controls;
 133 };
 134
 135 static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
 136         struct soc_camera_ops *ops, int id)
 137 {
 138         int i;
 139
 140         for (i = 0; i < ops->num_controls; i++)
 141                 if (ops->controls[i].id == id)
 142                         return &ops->controls[i];
 143
 144         return NULL;
 145 }
 146
 147 #define SOCAM_MASTER                    (1 << 0)
 148 #define SOCAM_SLAVE                     (1 << 1)
 149 #define SOCAM_HSYNC_ACTIVE_HIGH         (1 << 2)
 150 #define SOCAM_HSYNC_ACTIVE_LOW          (1 << 3)
 151 #define SOCAM_VSYNC_ACTIVE_HIGH         (1 << 4)
 152 #define SOCAM_VSYNC_ACTIVE_LOW          (1 << 5)
 153 #define SOCAM_DATAWIDTH_8               (1 << 6)
 154 #define SOCAM_DATAWIDTH_9               (1 << 7)
 155 #define SOCAM_DATAWIDTH_10              (1 << 8)
 156 #define SOCAM_DATAWIDTH_16              (1 << 9)
 157 #define SOCAM_PCLK_SAMPLE_RISING        (1 << 10)
 158 #define SOCAM_PCLK_SAMPLE_FALLING       (1 << 11)
 159
 160 #define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_9 | \
 161                               SOCAM_DATAWIDTH_10 | SOCAM_DATAWIDTH_16)
 162
 163 static inline unsigned long soc_camera_bus_param_compatible(
 164                         unsigned long camera_flags, unsigned long bus_flags)
 165 {
 166         unsigned long common_flags, hsync, vsync, pclk;
 167
 168         common_flags = camera_flags & bus_flags;
 169
 170         hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
 171         vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
 172         pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
 173
 174         return (!hsync || !vsync || !pclk) ? 0 : common_flags;
 175 }
 176
 177 #endif