include/media/v4l2-int-device.h

   1 /*
   2  * include/media/v4l2-int-device.h
   3  *
   4  * V4L2 internal ioctl interface.
   5  *
   6  * Copyright (C) 2007 Nokia Corporation.
   7  *
   8  * Contact: Sakari Ailus <sakari.ailus@nokia.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  */
  24
  25 #ifndef V4L2_INT_DEVICE_H
  26 #define V4L2_INT_DEVICE_H
  27
  28 #include <linux/module.h>
  29 #include <media/v4l2-common.h>
  30
  31 #define V4L2NAMESIZE 32
  32
  33 /*
  34  *
  35  * The internal V4L2 device interface core.
  36  *
  37  */
  38
  39 enum v4l2_int_type {
  40         v4l2_int_type_master = 1,
  41         v4l2_int_type_slave
  42 };
  43
  44 struct v4l2_int_device;
  45
  46 struct v4l2_int_master {
  47         int (*attach)(struct v4l2_int_device *slave);
  48         void (*detach)(struct v4l2_int_device *slave);
  49 };
  50
  51 typedef int (v4l2_int_ioctl_func)(struct v4l2_int_device *);
  52 typedef int (v4l2_int_ioctl_func_0)(struct v4l2_int_device *);
  53 typedef int (v4l2_int_ioctl_func_1)(struct v4l2_int_device *, void *);
  54
  55 struct v4l2_int_ioctl_desc {
  56         int num;
  57         v4l2_int_ioctl_func *func;
  58 };
  59
  60 struct v4l2_int_slave {
  61         /* Don't touch master. */
  62         struct v4l2_int_device *master;
  63
  64         char attach_to[V4L2NAMESIZE];
  65
  66         int num_ioctls;
  67         struct v4l2_int_ioctl_desc *ioctls;
  68 };
  69
  70 struct v4l2_int_device {
  71         /* Don't touch head. */
  72         struct list_head head;
  73
  74         struct module *module;
  75
  76         char name[V4L2NAMESIZE];
  77
  78         enum v4l2_int_type type;
  79         union {
  80                 struct v4l2_int_master *master;
  81                 struct v4l2_int_slave *slave;
  82         } u;
  83
  84         void *priv;
  85 };
  86
  87 int v4l2_int_device_register(struct v4l2_int_device *d);
  88 void v4l2_int_device_unregister(struct v4l2_int_device *d);
  89
  90 int v4l2_int_ioctl_0(struct v4l2_int_device *d, int cmd);
  91 int v4l2_int_ioctl_1(struct v4l2_int_device *d, int cmd, void *arg);
  92
  93 /*
  94  *
  95  * Types and definitions for IOCTL commands.
  96  *
  97  */
  98
  99 /* Slave interface type. */
 100 enum v4l2_if_type {
 101         /*
 102          * Parallel 8-, 10- or 12-bit interface, used by for example
 103          * on certain image sensors.
 104          */
 105         V4L2_IF_TYPE_BT656,
 106 };
 107
 108 enum v4l2_if_type_bt656_mode {
 109         /*
 110          * Modes without Bt synchronisation codes. Separate
 111          * synchronisation signal lines are used.
 112          */
 113         V4L2_IF_TYPE_BT656_MODE_NOBT_8BIT,
 114         V4L2_IF_TYPE_BT656_MODE_NOBT_10BIT,
 115         V4L2_IF_TYPE_BT656_MODE_NOBT_12BIT,
 116         /*
 117          * Use Bt synchronisation codes. The vertical and horizontal
 118          * synchronisation is done based on synchronisation codes.
 119          */
 120         V4L2_IF_TYPE_BT656_MODE_BT_8BIT,
 121         V4L2_IF_TYPE_BT656_MODE_BT_10BIT,
 122 };
 123
 124 struct v4l2_if_type_bt656 {
 125         /*
 126          * 0: Frame begins when vsync is high.
 127          * 1: Frame begins when vsync changes from low to high.
 128          */
 129         unsigned frame_start_on_rising_vs:1;
 130         /* Use Bt synchronisation codes for sync correction. */
 131         unsigned bt_sync_correct:1;
 132         /* Swap every two adjacent image data elements. */
 133         unsigned swap:1;
 134         /* Inverted latch clock polarity from slave. */
 135         unsigned latch_clk_inv:1;
 136         /* Hs polarity. 0 is active high, 1 active low. */
 137         unsigned nobt_hs_inv:1;
 138         /* Vs polarity. 0 is active high, 1 active low. */
 139         unsigned nobt_vs_inv:1;
 140         enum v4l2_if_type_bt656_mode mode;
 141         /* Minimum accepted bus clock for slave (in Hz). */
 142         u32 clock_min;
 143         /* Maximum accepted bus clock for slave. */
 144         u32 clock_max;
 145         /*
 146          * Current wish of the slave. May only change in response to
 147          * ioctls that affect image capture.
 148          */
 149         u32 clock_curr;
 150 };
 151
 152 struct v4l2_ifparm {
 153         enum v4l2_if_type if_type;
 154         union {
 155                 struct v4l2_if_type_bt656 bt656;
 156         } u;
 157 };
 158
 159 /* IOCTL command numbers. */
 160 enum v4l2_int_ioctl_num {
 161         /*
 162          *
 163          * "Proper" V4L ioctls, as in struct video_device.
 164          *
 165          */
 166         vidioc_int_enum_fmt_cap_num = 1,
 167         vidioc_int_g_fmt_cap_num,
 168         vidioc_int_s_fmt_cap_num,
 169         vidioc_int_try_fmt_cap_num,
 170         vidioc_int_queryctrl_num,
 171         vidioc_int_g_ctrl_num,
 172         vidioc_int_s_ctrl_num,
 173         vidioc_int_g_parm_num,
 174         vidioc_int_s_parm_num,
 175
 176         /*
 177          *
 178          * Strictly internal ioctls.
 179          *
 180          */
 181         /* Initialise the device when slave attaches to the master. */
 182         vidioc_int_dev_init_num = 1000,
 183         /* Delinitialise the device at slave detach. */
 184         vidioc_int_dev_exit_num,
 185         /* Set device power state: 0 is off, non-zero is on. */
 186         vidioc_int_s_power_num,
 187         /* Get slave interface parameters. */
 188         vidioc_int_g_ifparm_num,
 189         /* Does the slave need to be reset after VIDIOC_DQBUF? */
 190         vidioc_int_g_needs_reset_num,
 191
 192         /*
 193          *
 194          * VIDIOC_INT_* ioctls.
 195          *
 196          */
 197         /* VIDIOC_INT_RESET */
 198         vidioc_int_reset_num,
 199         /* VIDIOC_INT_INIT */
 200         vidioc_int_init_num,
 201         /* VIDIOC_INT_G_CHIP_IDENT */
 202         vidioc_int_g_chip_ident_num,
 203
 204         /*
 205          *
 206          * Start of private ioctls.
 207          *
 208          */
 209         vidioc_int_priv_start_num = 2000,
 210 };
 211
 212 /*
 213  *
 214  * IOCTL wrapper functions for better type checking.
 215  *
 216  */
 217
 218 #define V4L2_INT_WRAPPER_0(name)                                        \
 219         static inline int vidioc_int_##name(struct v4l2_int_device *d)  \
 220         {                                                               \
 221                 return v4l2_int_ioctl_0(d, vidioc_int_##name##_num);    \
 222         }                                                               \
 223                                                                         \
 224         static inline struct v4l2_int_ioctl_desc                        \
 225         vidioc_int_##name##_cb(int (*func)                              \
 226                                (struct v4l2_int_device *))              \
 227         {                                                               \
 228                 struct v4l2_int_ioctl_desc desc;                        \
 229                                                                         \
 230                 desc.num = vidioc_int_##name##_num;                     \
 231                 desc.func = (v4l2_int_ioctl_func *)func;                \
 232                                                                         \
 233                 return desc;                                            \
 234         }
 235
 236 #define V4L2_INT_WRAPPER_1(name, arg_type, asterisk)                    \
 237         static inline int vidioc_int_##name(struct v4l2_int_device *d,  \
 238                                             arg_type asterisk arg)      \
 239         {                                                               \
 240                 return v4l2_int_ioctl_1(d, vidioc_int_##name##_num,     \
 241                                         (void *)(unsigned long)arg);    \
 242         }                                                               \
 243                                                                         \
 244         static inline struct v4l2_int_ioctl_desc                        \
 245         vidioc_int_##name##_cb(int (*func)                              \
 246                                (struct v4l2_int_device *,               \
 247                                 arg_type asterisk))                     \
 248         {                                                               \
 249                 struct v4l2_int_ioctl_desc desc;                        \
 250                                                                         \
 251                 desc.num = vidioc_int_##name##_num;                     \
 252                 desc.func = (v4l2_int_ioctl_func *)func;                \
 253                                                                         \
 254                 return desc;                                            \
 255         }
 256
 257 V4L2_INT_WRAPPER_1(enum_fmt_cap, struct v4l2_fmtdesc, *);
 258 V4L2_INT_WRAPPER_1(g_fmt_cap, struct v4l2_format, *);
 259 V4L2_INT_WRAPPER_1(s_fmt_cap, struct v4l2_format, *);
 260 V4L2_INT_WRAPPER_1(try_fmt_cap, struct v4l2_format, *);
 261 V4L2_INT_WRAPPER_1(queryctrl, struct v4l2_queryctrl, *);
 262 V4L2_INT_WRAPPER_1(g_ctrl, struct v4l2_control, *);
 263 V4L2_INT_WRAPPER_1(s_ctrl, struct v4l2_control, *);
 264 V4L2_INT_WRAPPER_1(g_parm, struct v4l2_streamparm, *);
 265 V4L2_INT_WRAPPER_1(s_parm, struct v4l2_streamparm, *);
 266
 267 V4L2_INT_WRAPPER_0(dev_init);
 268 V4L2_INT_WRAPPER_0(dev_exit);
 269 V4L2_INT_WRAPPER_1(s_power, int, );
 270 V4L2_INT_WRAPPER_1(g_ifparm, struct v4l2_ifparm, *);
 271 V4L2_INT_WRAPPER_1(g_needs_reset, void, *);
 272
 273 V4L2_INT_WRAPPER_0(reset);
 274 V4L2_INT_WRAPPER_0(init);
 275 V4L2_INT_WRAPPER_1(g_chip_ident, int, *);
 276
 277 #endif