linux/include/media/v4l2-int-device.h
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   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 <media/v4l2-common.h>
  29
  30#define V4L2NAMESIZE 32
  31
  32/*
  33 *
  34 * The internal V4L2 device interface core.
  35 *
  36 */
  37
  38enum v4l2_int_type {
  39        v4l2_int_type_master = 1,
  40        v4l2_int_type_slave
  41};
  42
  43struct module;
  44
  45struct v4l2_int_device;
  46
  47struct v4l2_int_master {
  48        int (*attach)(struct v4l2_int_device *slave);
  49        void (*detach)(struct v4l2_int_device *slave);
  50};
  51
  52typedef int (v4l2_int_ioctl_func)(struct v4l2_int_device *);
  53typedef int (v4l2_int_ioctl_func_0)(struct v4l2_int_device *);
  54typedef int (v4l2_int_ioctl_func_1)(struct v4l2_int_device *, void *);
  55
  56struct v4l2_int_ioctl_desc {
  57        int num;
  58        v4l2_int_ioctl_func *func;
  59};
  60
  61struct 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
  71struct 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
  88void v4l2_int_device_try_attach_all(void);
  89
  90int v4l2_int_device_register(struct v4l2_int_device *d);
  91void v4l2_int_device_unregister(struct v4l2_int_device *d);
  92
  93int v4l2_int_ioctl_0(struct v4l2_int_device *d, int cmd);
  94int v4l2_int_ioctl_1(struct v4l2_int_device *d, int cmd, void *arg);
  95
  96/*
  97 *
  98 * Types and definitions for IOCTL commands.
  99 *
 100 */
 101
 102enum v4l2_power {
 103        V4L2_POWER_OFF = 0,
 104        V4L2_POWER_ON,
 105        V4L2_POWER_STANDBY,
 106};
 107
 108/* Slave interface type. */
 109enum v4l2_if_type {
 110        /*
 111         * Parallel 8-, 10- or 12-bit interface, used by for example
 112         * on certain image sensors.
 113         */
 114        V4L2_IF_TYPE_BT656,
 115};
 116
 117enum v4l2_if_type_bt656_mode {
 118        /*
 119         * Modes without Bt synchronisation codes. Separate
 120         * synchronisation signal lines are used.
 121         */
 122        V4L2_IF_TYPE_BT656_MODE_NOBT_8BIT,
 123        V4L2_IF_TYPE_BT656_MODE_NOBT_10BIT,
 124        V4L2_IF_TYPE_BT656_MODE_NOBT_12BIT,
 125        /*
 126         * Use Bt synchronisation codes. The vertical and horizontal
 127         * synchronisation is done based on synchronisation codes.
 128         */
 129        V4L2_IF_TYPE_BT656_MODE_BT_8BIT,
 130        V4L2_IF_TYPE_BT656_MODE_BT_10BIT,
 131};
 132
 133struct v4l2_if_type_bt656 {
 134        /*
 135         * 0: Frame begins when vsync is high.
 136         * 1: Frame begins when vsync changes from low to high.
 137         */
 138        unsigned frame_start_on_rising_vs:1;
 139        /* Use Bt synchronisation codes for sync correction. */
 140        unsigned bt_sync_correct:1;
 141        /* Swap every two adjacent image data elements. */
 142        unsigned swap:1;
 143        /* Inverted latch clock polarity from slave. */
 144        unsigned latch_clk_inv:1;
 145        /* Hs polarity. 0 is active high, 1 active low. */
 146        unsigned nobt_hs_inv:1;
 147        /* Vs polarity. 0 is active high, 1 active low. */
 148        unsigned nobt_vs_inv:1;
 149        enum v4l2_if_type_bt656_mode mode;
 150        /* Minimum accepted bus clock for slave (in Hz). */
 151        u32 clock_min;
 152        /* Maximum accepted bus clock for slave. */
 153        u32 clock_max;
 154        /*
 155         * Current wish of the slave. May only change in response to
 156         * ioctls that affect image capture.
 157         */
 158        u32 clock_curr;
 159};
 160
 161struct v4l2_ifparm {
 162        enum v4l2_if_type if_type;
 163        union {
 164                struct v4l2_if_type_bt656 bt656;
 165        } u;
 166};
 167
 168/* IOCTL command numbers. */
 169enum v4l2_int_ioctl_num {
 170        /*
 171         *
 172         * "Proper" V4L ioctls, as in struct video_device.
 173         *
 174         */
 175        vidioc_int_enum_fmt_cap_num = 1,
 176        vidioc_int_g_fmt_cap_num,
 177        vidioc_int_s_fmt_cap_num,
 178        vidioc_int_try_fmt_cap_num,
 179        vidioc_int_queryctrl_num,
 180        vidioc_int_g_ctrl_num,
 181        vidioc_int_s_ctrl_num,
 182        vidioc_int_cropcap_num,
 183        vidioc_int_g_crop_num,
 184        vidioc_int_s_crop_num,
 185        vidioc_int_g_parm_num,
 186        vidioc_int_s_parm_num,
 187        vidioc_int_querystd_num,
 188        vidioc_int_s_std_num,
 189        vidioc_int_s_video_routing_num,
 190
 191        /*
 192         *
 193         * Strictly internal ioctls.
 194         *
 195         */
 196        /* Initialise the device when slave attaches to the master. */
 197        vidioc_int_dev_init_num = 1000,
 198        /* Delinitialise the device at slave detach. */
 199        vidioc_int_dev_exit_num,
 200        /* Set device power state. */
 201        vidioc_int_s_power_num,
 202        /*
 203        * Get slave private data, e.g. platform-specific slave
 204        * configuration used by the master.
 205        */
 206        vidioc_int_g_priv_num,
 207        /* Get slave interface parameters. */
 208        vidioc_int_g_ifparm_num,
 209        /* Does the slave need to be reset after VIDIOC_DQBUF? */
 210        vidioc_int_g_needs_reset_num,
 211        vidioc_int_enum_framesizes_num,
 212        vidioc_int_enum_frameintervals_num,
 213
 214        /*
 215         *
 216         * VIDIOC_INT_* ioctls.
 217         *
 218         */
 219        /* VIDIOC_INT_RESET */
 220        vidioc_int_reset_num,
 221        /* VIDIOC_INT_INIT */
 222        vidioc_int_init_num,
 223        /* VIDIOC_DBG_G_CHIP_IDENT */
 224        vidioc_int_g_chip_ident_num,
 225
 226        /*
 227         *
 228         * Start of private ioctls.
 229         *
 230         */
 231        vidioc_int_priv_start_num = 2000,
 232};
 233
 234/*
 235 *
 236 * IOCTL wrapper functions for better type checking.
 237 *
 238 */
 239
 240#define V4L2_INT_WRAPPER_0(name)                                        \
 241        static inline int vidioc_int_##name(struct v4l2_int_device *d)  \
 242        {                                                               \
 243                return v4l2_int_ioctl_0(d, vidioc_int_##name##_num);    \
 244        }                                                               \
 245                                                                        \
 246        static inline struct v4l2_int_ioctl_desc                        \
 247        vidioc_int_##name##_cb(int (*func)                              \
 248                               (struct v4l2_int_device *))              \
 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#define V4L2_INT_WRAPPER_1(name, arg_type, asterisk)                    \
 259        static inline int vidioc_int_##name(struct v4l2_int_device *d,  \
 260                                            arg_type asterisk arg)      \
 261        {                                                               \
 262                return v4l2_int_ioctl_1(d, vidioc_int_##name##_num,     \
 263                                        (void *)(unsigned long)arg);    \
 264        }                                                               \
 265                                                                        \
 266        static inline struct v4l2_int_ioctl_desc                        \
 267        vidioc_int_##name##_cb(int (*func)                              \
 268                               (struct v4l2_int_device *,               \
 269                                arg_type asterisk))                     \
 270        {                                                               \
 271                struct v4l2_int_ioctl_desc desc;                        \
 272                                                                        \
 273                desc.num = vidioc_int_##name##_num;                     \
 274                desc.func = (v4l2_int_ioctl_func *)func;                \
 275                                                                        \
 276                return desc;                                            \
 277        }
 278
 279V4L2_INT_WRAPPER_1(enum_fmt_cap, struct v4l2_fmtdesc, *);
 280V4L2_INT_WRAPPER_1(g_fmt_cap, struct v4l2_format, *);
 281V4L2_INT_WRAPPER_1(s_fmt_cap, struct v4l2_format, *);
 282V4L2_INT_WRAPPER_1(try_fmt_cap, struct v4l2_format, *);
 283V4L2_INT_WRAPPER_1(queryctrl, struct v4l2_queryctrl, *);
 284V4L2_INT_WRAPPER_1(g_ctrl, struct v4l2_control, *);
 285V4L2_INT_WRAPPER_1(s_ctrl, struct v4l2_control, *);
 286V4L2_INT_WRAPPER_1(cropcap, struct v4l2_cropcap, *);
 287V4L2_INT_WRAPPER_1(g_crop, struct v4l2_crop, *);
 288V4L2_INT_WRAPPER_1(s_crop, struct v4l2_crop, *);
 289V4L2_INT_WRAPPER_1(g_parm, struct v4l2_streamparm, *);
 290V4L2_INT_WRAPPER_1(s_parm, struct v4l2_streamparm, *);
 291V4L2_INT_WRAPPER_1(querystd, v4l2_std_id, *);
 292V4L2_INT_WRAPPER_1(s_std, v4l2_std_id, *);
 293V4L2_INT_WRAPPER_1(s_video_routing, struct v4l2_routing, *);
 294
 295V4L2_INT_WRAPPER_0(dev_init);
 296V4L2_INT_WRAPPER_0(dev_exit);
 297V4L2_INT_WRAPPER_1(s_power, enum v4l2_power, );
 298V4L2_INT_WRAPPER_1(g_priv, void, *);
 299V4L2_INT_WRAPPER_1(g_ifparm, struct v4l2_ifparm, *);
 300V4L2_INT_WRAPPER_1(g_needs_reset, void, *);
 301V4L2_INT_WRAPPER_1(enum_framesizes, struct v4l2_frmsizeenum, *);
 302V4L2_INT_WRAPPER_1(enum_frameintervals, struct v4l2_frmivalenum, *);
 303
 304V4L2_INT_WRAPPER_0(reset);
 305V4L2_INT_WRAPPER_0(init);
 306V4L2_INT_WRAPPER_1(g_chip_ident, int, *);
 307
 308#endif
 309
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