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 *master,
  48                       struct v4l2_int_device *slave);
  49         void (*detach)(struct v4l2_int_device *master);
  50 };
  51
  52 typedef int (v4l2_int_ioctl_func)(struct v4l2_int_device *);
  53 typedef int (v4l2_int_ioctl_func_0)(struct v4l2_int_device *);
  54 typedef int (v4l2_int_ioctl_func_1)(struct v4l2_int_device *, void *);
  55
  56 struct v4l2_int_ioctl_desc {
  57         int num;
  58         v4l2_int_ioctl_func *func;
  59 };
  60
  61 struct v4l2_int_slave {
  62         /* Don't touch master. */
  63         struct v4l2_int_device *master;
  64
  65         char attach_to[V4L2NAMESIZE];
  66
  67         int num_ioctls;
  68         struct v4l2_int_ioctl_desc *ioctls;
  69 };
  70
  71 struct v4l2_int_device {
  72         /* Don't touch head. */
  73         struct list_head head;
  74
  75         struct module *module;
  76
  77         char name[V4L2NAMESIZE];
  78
  79         enum v4l2_int_type type;
  80         union {
  81                 struct v4l2_int_master *master;
  82                 struct v4l2_int_slave *slave;
  83         } u;
  84
  85         void *priv;
  86 };
  87
  88 int v4l2_int_device_register(struct v4l2_int_device *d);
  89 void v4l2_int_device_unregister(struct v4l2_int_device *d);
  90
  91 int v4l2_int_ioctl_0(struct v4l2_int_device *d, int cmd);
  92 int v4l2_int_ioctl_1(struct v4l2_int_device *d, int cmd, void *arg);
  93
  94 /*
  95  *
  96  * Types and definitions for IOCTL commands.
  97  *
  98  */
  99
 100 /* Slave interface type. */
 101 enum v4l2_if_type {
 102         /*
 103          * Parallel 8-, 10- or 12-bit interface, used by for example
 104          * on certain image sensors.
 105          */
 106         V4L2_IF_TYPE_BT656,
 107 };
 108
 109 enum v4l2_if_type_bt656_mode {
 110         /*
 111          * Modes without Bt synchronisation codes. Separate
 112          * synchronisation signal lines are used.
 113          */
 114         V4L2_IF_TYPE_BT656_MODE_NOBT_8BIT,
 115         V4L2_IF_TYPE_BT656_MODE_NOBT_10BIT,
 116         V4L2_IF_TYPE_BT656_MODE_NOBT_12BIT,
 117         /*
 118          * Use Bt synchronisation codes. The vertical and horizontal
 119          * synchronisation is done based on synchronisation codes.
 120          */
 121         V4L2_IF_TYPE_BT656_MODE_BT_8BIT,
 122         V4L2_IF_TYPE_BT656_MODE_BT_10BIT,
 123 };
 124
 125 struct v4l2_if_type_bt656 {
 126         /*
 127          * 0: Frame begins when vsync is high.
 128          * 1: Frame begins when vsync changes from low to high.
 129          */
 130         unsigned frame_start_on_rising_vs:1;
 131         /* Use Bt synchronisation codes for sync correction. */
 132         unsigned bt_sync_correct:1;
 133         /* Swap every two adjacent image data elements. */
 134         unsigned swap:1;
 135         /* Inverted latch clock polarity from slave. */
 136         unsigned latch_clk_inv:1;
 137         /* Hs polarity. 0 is active high, 1 active low. */
 138         unsigned nobt_hs_inv:1;
 139         /* Vs polarity. 0 is active high, 1 active low. */
 140         unsigned nobt_vs_inv:1;
 141         enum v4l2_if_type_bt656_mode mode;
 142         /* Minimum accepted bus clock for slave (in Hz). */
 143         u32 clock_min;
 144         /* Maximum accepted bus clock for slave. */
 145         u32 clock_max;
 146         /*
 147          * Current wish of the slave. May only change in response to
 148          * ioctls that affect image capture.
 149          */
 150         u32 clock_curr;
 151 };
 152
 153 struct v4l2_ifparm {
 154         enum v4l2_if_type if_type;
 155         union {
 156                 struct v4l2_if_type_bt656 bt656;
 157         } u;
 158 };
 159
 160 /* IOCTL command numbers. */
 161 enum v4l2_int_ioctl_num {
 162         /*
 163          *
 164          * "Proper" V4L ioctls, as in struct video_device.
 165          *
 166          */
 167         vidioc_int_enum_fmt_cap_num = 1,
 168         vidioc_int_g_fmt_cap_num,
 169         vidioc_int_s_fmt_cap_num,
 170         vidioc_int_try_fmt_cap_num,
 171         vidioc_int_queryctrl_num,
 172         vidioc_int_g_ctrl_num,
 173         vidioc_int_s_ctrl_num,
 174         vidioc_int_g_parm_num,
 175         vidioc_int_s_parm_num,
 176
 177         /*
 178          *
 179          * Strictly internal ioctls.
 180          *
 181          */
 182         /* Initialise the device when slave attaches to the master. */
 183         vidioc_int_dev_init_num = 1000,
 184         /* Delinitialise the device at slave detach. */
 185         vidioc_int_dev_exit_num,
 186         /* Set device power state: 0 is off, non-zero is on. */
 187         vidioc_int_s_power_num,
 188         /* Get slave interface parameters. */
 189         vidioc_int_g_ifparm_num,
 190         /* Does the slave need to be reset after VIDIOC_DQBUF? */
 191         vidioc_int_g_needs_reset_num,
 192
 193         /*
 194          *
 195          * VIDIOC_INT_* ioctls.
 196          *
 197          */
 198         /* VIDIOC_INT_RESET */
 199         vidioc_int_reset_num,
 200         /* VIDIOC_INT_INIT */
 201         vidioc_int_init_num,
 202         /* VIDIOC_INT_G_CHIP_IDENT */
 203         vidioc_int_g_chip_ident_num,
 204
 205         /*
 206          *
 207          * Start of private ioctls.
 208          *
 209          */
 210         vidioc_int_priv_start_num = 2000,
 211 };
 212
 213 /*
 214  *
 215  * IOCTL wrapper functions for better type checking.
 216  *
 217  */
 218
 219 #define V4L2_INT_WRAPPER_0(name)                                        \
 220         static inline int vidioc_int_##name(struct v4l2_int_device *d)  \
 221         {                                                               \
 222                 return v4l2_int_ioctl_0(d, vidioc_int_##name##_num);    \
 223         }                                                               \
 224                                                                         \
 225         static inline struct v4l2_int_ioctl_desc                        \
 226         vidioc_int_##name##_cb(int (*func)                              \
 227                                (struct v4l2_int_device *))              \
 228         {                                                               \
 229                 struct v4l2_int_ioctl_desc desc;                        \
 230                                                                         \
 231                 desc.num = vidioc_int_##name##_num;                     \
 232                 desc.func = (v4l2_int_ioctl_func *)func;                \
 233                                                                         \
 234                 return desc;                                            \
 235         }
 236
 237 #define V4L2_INT_WRAPPER_1(name, arg_type, asterisk)                    \
 238         static inline int vidioc_int_##name(struct v4l2_int_device *d,  \
 239                                             arg_type asterisk arg)      \
 240         {                                                               \
 241                 return v4l2_int_ioctl_1(d, vidioc_int_##name##_num,     \
 242                                         (void *)(unsigned long)arg);    \
 243         }                                                               \
 244                                                                         \
 245         static inline struct v4l2_int_ioctl_desc                        \
 246         vidioc_int_##name##_cb(int (*func)                              \
 247                                (struct v4l2_int_device *,               \
 248                                 arg_type asterisk))                     \
 249         {                                                               \
 250                 struct v4l2_int_ioctl_desc desc;                        \
 251                                                                         \
 252                 desc.num = vidioc_int_##name##_num;                     \
 253                 desc.func = (v4l2_int_ioctl_func *)func;                \
 254                                                                         \
 255                 return desc;                                            \
 256         }
 257
 258 V4L2_INT_WRAPPER_1(enum_fmt_cap, struct v4l2_fmtdesc, *);
 259 V4L2_INT_WRAPPER_1(g_fmt_cap, struct v4l2_format, *);
 260 V4L2_INT_WRAPPER_1(s_fmt_cap, struct v4l2_format, *);
 261 V4L2_INT_WRAPPER_1(try_fmt_cap, struct v4l2_format, *);
 262 V4L2_INT_WRAPPER_1(queryctrl, struct v4l2_queryctrl, *);
 263 V4L2_INT_WRAPPER_1(g_ctrl, struct v4l2_control, *);
 264 V4L2_INT_WRAPPER_1(s_ctrl, struct v4l2_control, *);
 265 V4L2_INT_WRAPPER_1(g_parm, struct v4l2_streamparm, *);
 266 V4L2_INT_WRAPPER_1(s_parm, struct v4l2_streamparm, *);
 267
 268 V4L2_INT_WRAPPER_0(dev_init);
 269 V4L2_INT_WRAPPER_0(dev_exit);
 270 V4L2_INT_WRAPPER_1(s_power, int, );
 271 V4L2_INT_WRAPPER_1(g_ifparm, struct v4l2_ifparm, *);
 272 V4L2_INT_WRAPPER_1(g_needs_reset, void, *);
 273
 274 V4L2_INT_WRAPPER_0(reset);
 275 V4L2_INT_WRAPPER_0(init);
 276 V4L2_INT_WRAPPER_1(g_chip_ident, int, *);
 277
 278 #endif