drivers/media/usb/gspca/gspca.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef GSPCAV2_H
   3 #define GSPCAV2_H
   4
   5 #include <linux/module.h>
   6 #include <linux/kernel.h>
   7 #include <linux/usb.h>
   8 #include <linux/videodev2.h>
   9 #include <media/v4l2-common.h>
  10 #include <media/v4l2-ctrls.h>
  11 #include <media/v4l2-device.h>
  12 #include <media/videobuf2-v4l2.h>
  13 #include <media/videobuf2-vmalloc.h>
  14 #include <linux/mutex.h>
  15
  16
  17
  18 /* GSPCA debug codes */
  19
  20 #define D_PROBE  1
  21 #define D_CONF   2
  22 #define D_STREAM 3
  23 #define D_FRAM   4
  24 #define D_PACK   5
  25 #define D_USBI   6
  26 #define D_USBO   7
  27
  28 extern int gspca_debug;
  29
  30
  31 #define gspca_dbg(gspca_dev, level, fmt, ...)                   \
  32         v4l2_dbg(level, gspca_debug, &(gspca_dev)->v4l2_dev,    \
  33                  fmt, ##__VA_ARGS__)
  34
  35 #define gspca_err(gspca_dev, fmt, ...)                          \
  36         v4l2_err(&(gspca_dev)->v4l2_dev, fmt, ##__VA_ARGS__)
  37
  38 #define GSPCA_MAX_FRAMES 16     /* maximum number of video frame buffers */
  39 /* image transfers */
  40 #define MAX_NURBS 4             /* max number of URBs */
  41
  42
  43 /* used to list framerates supported by a camera mode (resolution) */
  44 struct framerates {
  45         const u8 *rates;
  46         int nrates;
  47 };
  48
  49 /* device information - set at probe time */
  50 struct cam {
  51         const struct v4l2_pix_format *cam_mode; /* size nmodes */
  52         const struct framerates *mode_framerates; /* must have size nmodes,
  53                                                    * just like cam_mode */
  54         u32 bulk_size;          /* buffer size when image transfer by bulk */
  55         u32 input_flags;        /* value for ENUM_INPUT status flags */
  56         u8 nmodes;              /* size of cam_mode */
  57         u8 no_urb_create;       /* don't create transfer URBs */
  58         u8 bulk_nurbs;          /* number of URBs in bulk mode
  59                                  * - cannot be > MAX_NURBS
  60                                  * - when 0 and bulk_size != 0 means
  61                                  *   1 URB and submit done by subdriver */
  62         u8 bulk;                /* image transfer by 0:isoc / 1:bulk */
  63         u8 npkt;                /* number of packets in an ISOC message
  64                                  * 0 is the default value: 32 packets */
  65         u8 needs_full_bandwidth;/* Set this flag to notify the bandwidth calc.
  66                                  * code that the cam fills all image buffers to
  67                                  * the max, even when using compression. */
  68 };
  69
  70 struct gspca_dev;
  71 struct gspca_frame;
  72
  73 /* subdriver operations */
  74 typedef int (*cam_op) (struct gspca_dev *);
  75 typedef void (*cam_v_op) (struct gspca_dev *);
  76 typedef int (*cam_cf_op) (struct gspca_dev *, const struct usb_device_id *);
  77 typedef int (*cam_get_jpg_op) (struct gspca_dev *,
  78                                 struct v4l2_jpegcompression *);
  79 typedef int (*cam_set_jpg_op) (struct gspca_dev *,
  80                                 const struct v4l2_jpegcompression *);
  81 typedef int (*cam_get_reg_op) (struct gspca_dev *,
  82                                 struct v4l2_dbg_register *);
  83 typedef int (*cam_set_reg_op) (struct gspca_dev *,
  84                                 const struct v4l2_dbg_register *);
  85 typedef int (*cam_chip_info_op) (struct gspca_dev *,
  86                                 struct v4l2_dbg_chip_info *);
  87 typedef void (*cam_streamparm_op) (struct gspca_dev *,
  88                                   struct v4l2_streamparm *);
  89 typedef void (*cam_pkt_op) (struct gspca_dev *gspca_dev,
  90                                 u8 *data,
  91                                 int len);
  92 typedef int (*cam_int_pkt_op) (struct gspca_dev *gspca_dev,
  93                                 u8 *data,
  94                                 int len);
  95 typedef void (*cam_format_op) (struct gspca_dev *gspca_dev,
  96                                 struct v4l2_format *fmt);
  97 typedef int (*cam_frmsize_op) (struct gspca_dev *gspca_dev,
  98                                 struct v4l2_frmsizeenum *fsize);
  99
 100 /* subdriver description */
 101 struct sd_desc {
 102 /* information */
 103         const char *name;       /* sub-driver name */
 104 /* mandatory operations */
 105         cam_cf_op config;       /* called on probe */
 106         cam_op init;            /* called on probe and resume */
 107         cam_op init_controls;   /* called on probe */
 108         cam_op start;           /* called on stream on after URBs creation */
 109         cam_pkt_op pkt_scan;
 110 /* optional operations */
 111         cam_op isoc_init;       /* called on stream on before getting the EP */
 112         cam_op isoc_nego;       /* called when URB submit failed with NOSPC */
 113         cam_v_op stopN;         /* called on stream off - main alt */
 114         cam_v_op stop0;         /* called on stream off & disconnect - alt 0 */
 115         cam_v_op dq_callback;   /* called when a frame has been dequeued */
 116         cam_get_jpg_op get_jcomp;
 117         cam_set_jpg_op set_jcomp;
 118         cam_streamparm_op get_streamparm;
 119         cam_streamparm_op set_streamparm;
 120         cam_format_op try_fmt;
 121         cam_frmsize_op enum_framesizes;
 122 #ifdef CONFIG_VIDEO_ADV_DEBUG
 123         cam_set_reg_op set_register;
 124         cam_get_reg_op get_register;
 125         cam_chip_info_op get_chip_info;
 126 #endif
 127 #if IS_ENABLED(CONFIG_INPUT)
 128         cam_int_pkt_op int_pkt_scan;
 129         /* other_input makes the gspca core create gspca_dev->input even when
 130            int_pkt_scan is NULL, for cams with non interrupt driven buttons */
 131         u8 other_input;
 132 #endif
 133 };
 134
 135 /* packet types when moving from iso buf to frame buf */
 136 enum gspca_packet_type {
 137         DISCARD_PACKET,
 138         FIRST_PACKET,
 139         INTER_PACKET,
 140         LAST_PACKET
 141 };
 142
 143 struct gspca_buffer {
 144         struct vb2_v4l2_buffer vb;
 145         struct list_head list;
 146 };
 147
 148 static inline struct gspca_buffer *to_gspca_buffer(struct vb2_buffer *vb2)
 149 {
 150         return container_of(vb2, struct gspca_buffer, vb.vb2_buf);
 151 }
 152
 153 struct gspca_dev {
 154         struct video_device vdev;       /* !! must be the first item */
 155         struct module *module;          /* subdriver handling the device */
 156         struct v4l2_device v4l2_dev;
 157         struct usb_device *dev;
 158
 159 #if IS_ENABLED(CONFIG_INPUT)
 160         struct input_dev *input_dev;
 161         char phys[64];                  /* physical device path */
 162 #endif
 163
 164         struct cam cam;                         /* device information */
 165         const struct sd_desc *sd_desc;          /* subdriver description */
 166         struct v4l2_ctrl_handler ctrl_handler;
 167
 168         /* autogain and exposure or gain control cluster, these are global as
 169            the autogain/exposure functions in autogain_functions.c use them */
 170         struct {
 171                 struct v4l2_ctrl *autogain;
 172                 struct v4l2_ctrl *exposure;
 173                 struct v4l2_ctrl *gain;
 174                 int exp_too_low_cnt, exp_too_high_cnt;
 175         };
 176
 177 #define USB_BUF_SZ 64
 178         __u8 *usb_buf;                          /* buffer for USB exchanges */
 179         struct urb *urb[MAX_NURBS];
 180 #if IS_ENABLED(CONFIG_INPUT)
 181         struct urb *int_urb;
 182 #endif
 183
 184         u8 *image;                              /* image being filled */
 185         u32 image_len;                          /* current length of image */
 186         __u8 last_packet_type;
 187         __s8 empty_packet;              /* if (-1) don't check empty packets */
 188         bool streaming;
 189
 190         __u8 curr_mode;                 /* current camera mode */
 191         struct v4l2_pix_format pixfmt;  /* current mode parameters */
 192         __u32 sequence;                 /* frame sequence number */
 193
 194         struct vb2_queue queue;
 195
 196         spinlock_t qlock;
 197         struct list_head buf_list;
 198
 199         wait_queue_head_t wq;           /* wait queue */
 200         struct mutex usb_lock;          /* usb exchange protection */
 201         int usb_err;                    /* USB error - protected by usb_lock */
 202         u16 pkt_size;                   /* ISOC packet size */
 203 #ifdef CONFIG_PM
 204         char frozen;                    /* suspend - resume */
 205 #endif
 206         bool present;
 207         char memory;                    /* memory type (V4L2_MEMORY_xxx) */
 208         __u8 iface;                     /* USB interface number */
 209         __u8 alt;                       /* USB alternate setting */
 210         int xfer_ep;                    /* USB transfer endpoint address */
 211         u8 audio;                       /* presence of audio device */
 212
 213         /* (*) These variables are proteced by both usb_lock and queue_lock,
 214            that is any code setting them is holding *both*, which means that
 215            any code getting them needs to hold at least one of them */
 216 };
 217
 218 int gspca_dev_probe(struct usb_interface *intf,
 219                 const struct usb_device_id *id,
 220                 const struct sd_desc *sd_desc,
 221                 int dev_size,
 222                 struct module *module);
 223 int gspca_dev_probe2(struct usb_interface *intf,
 224                 const struct usb_device_id *id,
 225                 const struct sd_desc *sd_desc,
 226                 int dev_size,
 227                 struct module *module);
 228 void gspca_disconnect(struct usb_interface *intf);
 229 void gspca_frame_add(struct gspca_dev *gspca_dev,
 230                         enum gspca_packet_type packet_type,
 231                         const u8 *data,
 232                         int len);
 233 #ifdef CONFIG_PM
 234 int gspca_suspend(struct usb_interface *intf, pm_message_t message);
 235 int gspca_resume(struct usb_interface *intf);
 236 #endif
 237 int gspca_expo_autogain(struct gspca_dev *gspca_dev, int avg_lum,
 238         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee);
 239 int gspca_coarse_grained_expo_autogain(struct gspca_dev *gspca_dev,
 240         int avg_lum, int desired_avg_lum, int deadzone);
 241
 242 #endif /* GSPCAV2_H */