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 <media/v4l2-common.h>
  29
  30 #define V4L2NAMESIZE 32
  31
  32 /*
  33  *
  34  * The internal V4L2 device interface core.
  35  *
  36  */
  37
  38 enum v4l2_int_type {
  39         v4l2_int_type_master = 1,
  40         v4l2_int_type_slave
  41 };
  42
  43 struct module;
  44
  45 struct v4l2_int_device;
  46
  47 struct v4l2_int_master {
  48         int (*attach)(struct v4l2_int_device *slave);
  49         void (*detach)(struct v4l2_int_device *slave);
  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 void v4l2_int_device_try_attach_all(void);
  89
  90 int v4l2_int_device_register(struct v4l2_int_device *d);
  91 void v4l2_int_device_unregister(struct v4l2_int_device *d);
  92
  93 int v4l2_int_ioctl_0(struct v4l2_int_device *d, int cmd);
  94 int 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
 102 enum v4l2_power {
 103         V4L2_POWER_OFF = 0,
 104         V4L2_POWER_ON,
 105         V4L2_POWER_STANDBY,
 106 };
 107
 108 /* Slave interface type. */
 109 enum 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
 117 enum 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
 133 struct 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
 161 struct 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. */
 169 enum 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
 279 V4L2_INT_WRAPPER_1(enum_fmt_cap, struct v4l2_fmtdesc, *);
 280 V4L2_INT_WRAPPER_1(g_fmt_cap, struct v4l2_format, *);
 281 V4L2_INT_WRAPPER_1(s_fmt_cap, struct v4l2_format, *);
 282 V4L2_INT_WRAPPER_1(try_fmt_cap, struct v4l2_format, *);
 283 V4L2_INT_WRAPPER_1(queryctrl, struct v4l2_queryctrl, *);
 284 V4L2_INT_WRAPPER_1(g_ctrl, struct v4l2_control, *);
 285 V4L2_INT_WRAPPER_1(s_ctrl, struct v4l2_control, *);
 286 V4L2_INT_WRAPPER_1(cropcap, struct v4l2_cropcap, *);
 287 V4L2_INT_WRAPPER_1(g_crop, struct v4l2_crop, *);
 288 V4L2_INT_WRAPPER_1(s_crop, struct v4l2_crop, *);
 289 V4L2_INT_WRAPPER_1(g_parm, struct v4l2_streamparm, *);
 290 V4L2_INT_WRAPPER_1(s_parm, struct v4l2_streamparm, *);
 291 V4L2_INT_WRAPPER_1(querystd, v4l2_std_id, *);
 292 V4L2_INT_WRAPPER_1(s_std, v4l2_std_id, *);
 293 V4L2_INT_WRAPPER_1(s_video_routing, struct v4l2_routing, *);
 294
 295 V4L2_INT_WRAPPER_0(dev_init);
 296 V4L2_INT_WRAPPER_0(dev_exit);
 297 V4L2_INT_WRAPPER_1(s_power, enum v4l2_power, );
 298 V4L2_INT_WRAPPER_1(g_priv, void, *);
 299 V4L2_INT_WRAPPER_1(g_ifparm, struct v4l2_ifparm, *);
 300 V4L2_INT_WRAPPER_1(g_needs_reset, void, *);
 301 V4L2_INT_WRAPPER_1(enum_framesizes, struct v4l2_frmsizeenum, *);
 302 V4L2_INT_WRAPPER_1(enum_frameintervals, struct v4l2_frmivalenum, *);
 303
 304 V4L2_INT_WRAPPER_0(reset);
 305 V4L2_INT_WRAPPER_0(init);
 306 V4L2_INT_WRAPPER_1(g_chip_ident, int, *);
 307
 308 #endif