include/media/v4l2-common.h

   1 /*
   2     v4l2 common internal API header
   3
   4     This header contains internal shared ioctl definitions for use by the
   5     internal low-level v4l2 drivers.
   6     Each ioctl begins with VIDIOC_INT_ to clearly mark that it is an internal
   7     define,
   8
   9     Copyright (C) 2005  Hans Verkuil <hverkuil@xs4all.nl>
  10
  11     This program is free software; you can redistribute it and/or modify
  12     it under the terms of the GNU General Public License as published by
  13     the Free Software Foundation; either version 2 of the License, or
  14     (at your option) any later version.
  15
  16     This program is distributed in the hope that it will be useful,
  17     but WITHOUT ANY WARRANTY; without even the implied warranty of
  18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19     GNU General Public License for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with this program; if not, write to the Free Software
  23     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26 #ifndef V4L2_COMMON_H_
  27 #define V4L2_COMMON_H_
  28
  29 #include <media/v4l2-dev.h>
  30
  31 /* Common printk constucts for v4l-i2c drivers. These macros create a unique
  32    prefix consisting of the driver name, the adapter number and the i2c
  33    address. */
  34 #define v4l_printk(level, name, adapter, addr, fmt, arg...) \
  35         printk(level "%s %d-%04x: " fmt, name, i2c_adapter_id(adapter), addr , ## arg)
  36
  37 #define v4l_client_printk(level, client, fmt, arg...)                       \
  38         v4l_printk(level, (client)->driver->driver.name, (client)->adapter, \
  39                    (client)->addr, fmt , ## arg)
  40
  41 #define v4l_err(client, fmt, arg...) \
  42         v4l_client_printk(KERN_ERR, client, fmt , ## arg)
  43
  44 #define v4l_warn(client, fmt, arg...) \
  45         v4l_client_printk(KERN_WARNING, client, fmt , ## arg)
  46
  47 #define v4l_info(client, fmt, arg...) \
  48         v4l_client_printk(KERN_INFO, client, fmt , ## arg)
  49
  50 /* These three macros assume that the debug level is set with a module
  51    parameter called 'debug'. */
  52 #define v4l_dbg(level, debug, client, fmt, arg...)                           \
  53         do {                                                                 \
  54                 if (debug >= (level))                                        \
  55                         v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \
  56         } while (0)
  57
  58 /* ------------------------------------------------------------------------- */
  59
  60 /* These printk constructs can be used with v4l2_device and v4l2_subdev */
  61 #define v4l2_printk(level, dev, fmt, arg...) \
  62         printk(level "%s: " fmt, (dev)->name , ## arg)
  63
  64 #define v4l2_err(dev, fmt, arg...) \
  65         v4l2_printk(KERN_ERR, dev, fmt , ## arg)
  66
  67 #define v4l2_warn(dev, fmt, arg...) \
  68         v4l2_printk(KERN_WARNING, dev, fmt , ## arg)
  69
  70 #define v4l2_info(dev, fmt, arg...) \
  71         v4l2_printk(KERN_INFO, dev, fmt , ## arg)
  72
  73 /* These three macros assume that the debug level is set with a module
  74    parameter called 'debug'. */
  75 #define v4l2_dbg(level, debug, dev, fmt, arg...)                        \
  76         do {                                                            \
  77                 if (debug >= (level))                                   \
  78                         v4l2_printk(KERN_DEBUG, dev, fmt , ## arg);     \
  79         } while (0)
  80
  81 /* ------------------------------------------------------------------------- */
  82
  83 /* Priority helper functions */
  84
  85 struct v4l2_prio_state {
  86         atomic_t prios[4];
  87 };
  88 int v4l2_prio_init(struct v4l2_prio_state *global);
  89 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
  90                      enum v4l2_priority new);
  91 int v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
  92 int v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority *local);
  93 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
  94 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local);
  95
  96 /* ------------------------------------------------------------------------- */
  97
  98 /* Control helper functions */
  99
 100 int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
 101                 const char **menu_items);
 102 const char *v4l2_ctrl_get_name(u32 id);
 103 const char **v4l2_ctrl_get_menu(u32 id);
 104 int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 step, s32 def);
 105 int v4l2_ctrl_query_fill_std(struct v4l2_queryctrl *qctrl);
 106 int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu,
 107                 struct v4l2_queryctrl *qctrl, const char **menu_items);
 108 #define V4L2_CTRL_MENU_IDS_END (0xffffffff)
 109 int v4l2_ctrl_query_menu_valid_items(struct v4l2_querymenu *qmenu, const u32 *ids);
 110 u32 v4l2_ctrl_next(const u32 * const *ctrl_classes, u32 id);
 111
 112 /* ------------------------------------------------------------------------- */
 113
 114 /* Register/chip ident helper function */
 115
 116 struct i2c_client; /* forward reference */
 117 int v4l2_chip_match_i2c_client(struct i2c_client *c, const struct v4l2_dbg_match *match);
 118 int v4l2_chip_ident_i2c_client(struct i2c_client *c, struct v4l2_dbg_chip_ident *chip,
 119                 u32 ident, u32 revision);
 120 int v4l2_chip_match_host(const struct v4l2_dbg_match *match);
 121
 122 /* ------------------------------------------------------------------------- */
 123
 124 /* Helper function for I2C legacy drivers */
 125
 126 struct i2c_driver;
 127 struct i2c_adapter;
 128 struct i2c_client;
 129 struct i2c_device_id;
 130 struct v4l2_device;
 131 struct v4l2_subdev;
 132 struct v4l2_subdev_ops;
 133
 134 int v4l2_i2c_attach(struct i2c_adapter *adapter, int address, struct i2c_driver *driver,
 135                 const char *name,
 136                 int (*probe)(struct i2c_client *, const struct i2c_device_id *));
 137
 138 /* Load an i2c module and return an initialized v4l2_subdev struct.
 139    Only call request_module if module_name != NULL.
 140    The client_type argument is the name of the chip that's on the adapter. */
 141 struct v4l2_subdev *v4l2_i2c_new_subdev(struct i2c_adapter *adapter,
 142                 const char *module_name, const char *client_type, u8 addr);
 143 /* Probe and load an i2c module and return an initialized v4l2_subdev struct.
 144    Only call request_module if module_name != NULL.
 145    The client_type argument is the name of the chip that's on the adapter. */
 146 struct v4l2_subdev *v4l2_i2c_new_probed_subdev(struct i2c_adapter *adapter,
 147                 const char *module_name, const char *client_type,
 148                 const unsigned short *addrs);
 149 /* Initialize an v4l2_subdev with data from an i2c_client struct */
 150 void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
 151                 const struct v4l2_subdev_ops *ops);
 152
 153 /* ------------------------------------------------------------------------- */
 154
 155 /* Internal ioctls */
 156
 157 /* VIDIOC_INT_DECODE_VBI_LINE */
 158 struct v4l2_decode_vbi_line {
 159         u32 is_second_field;    /* Set to 0 for the first (odd) field,
 160                                    set to 1 for the second (even) field. */
 161         u8 *p;                  /* Pointer to the sliced VBI data from the decoder.
 162                                    On exit points to the start of the payload. */
 163         u32 line;               /* Line number of the sliced VBI data (1-23) */
 164         u32 type;               /* VBI service type (V4L2_SLICED_*). 0 if no service found */
 165 };
 166
 167 struct v4l2_priv_tun_config {
 168         int tuner;
 169         void *priv;
 170 };
 171
 172 /* audio ioctls */
 173
 174 /* v4l device was opened in Radio mode, to be replaced by VIDIOC_INT_S_TUNER_MODE */
 175 #define AUDC_SET_RADIO        _IO('d',88)
 176
 177 /* tuner ioctls */
 178
 179 /* Sets tuner type and its I2C addr */
 180 #define TUNER_SET_TYPE_ADDR          _IOW('d', 90, int)
 181
 182 /* Puts tuner on powersaving state, disabling it, except for i2c. To be replaced
 183    by VIDIOC_INT_S_STANDBY. */
 184 #define TUNER_SET_STANDBY            _IOW('d', 91, int)
 185
 186 /* Sets tda9887 specific stuff, like port1, port2 and qss */
 187 #define TUNER_SET_CONFIG           _IOW('d', 92, struct v4l2_priv_tun_config)
 188
 189 /* Switch the tuner to a specific tuner mode. Replacement of AUDC_SET_RADIO */
 190 #define VIDIOC_INT_S_TUNER_MODE      _IOW('d', 93, enum v4l2_tuner_type)
 191
 192 /* Generic standby command. Passing -1 (all bits set to 1) will put the whole
 193    chip into standby mode, value 0 will make the chip fully active. Specific
 194    bits can be used by certain chips to enable/disable specific subsystems.
 195    Replacement of TUNER_SET_STANDBY. */
 196 #define VIDIOC_INT_S_STANDBY         _IOW('d', 94, u32)
 197
 198 /* 100, 101 used by  VIDIOC_DBG_[SG]_REGISTER */
 199
 200 /* Generic reset command. The argument selects which subsystems to reset.
 201    Passing 0 will always reset the whole chip. */
 202 #define VIDIOC_INT_RESET                _IOW ('d', 102, u32)
 203
 204 /* Set the frequency (in Hz) of the audio clock output.
 205    Used to slave an audio processor to the video decoder, ensuring that audio
 206    and video remain synchronized.
 207    Usual values for the frequency are 48000, 44100 or 32000 Hz.
 208    If the frequency is not supported, then -EINVAL is returned. */
 209 #define VIDIOC_INT_AUDIO_CLOCK_FREQ     _IOW ('d', 103, u32)
 210
 211 /* Video decoders that support sliced VBI need to implement this ioctl.
 212    Field p of the v4l2_sliced_vbi_line struct is set to the start of the VBI
 213    data that was generated by the decoder. The driver then parses the sliced
 214    VBI data and sets the other fields in the struct accordingly. The pointer p
 215    is updated to point to the start of the payload which can be copied
 216    verbatim into the data field of the v4l2_sliced_vbi_data struct. If no
 217    valid VBI data was found, then the type field is set to 0 on return. */
 218 #define VIDIOC_INT_DECODE_VBI_LINE      _IOWR('d', 104, struct v4l2_decode_vbi_line)
 219
 220 /* Used to generate VBI signals on a video signal. v4l2_sliced_vbi_data is
 221    filled with the data packets that should be output. Note that if you set
 222    the line field to 0, then that VBI signal is disabled. If no
 223    valid VBI data was found, then the type field is set to 0 on return. */
 224 #define VIDIOC_INT_S_VBI_DATA           _IOW ('d', 105, struct v4l2_sliced_vbi_data)
 225
 226 /* Used to obtain the sliced VBI packet from a readback register. Not all
 227    video decoders support this. If no data is available because the readback
 228    register contains invalid or erroneous data -EIO is returned. Note that
 229    you must fill in the 'id' member and the 'field' member (to determine
 230    whether CC data from the first or second field should be obtained). */
 231 #define VIDIOC_INT_G_VBI_DATA           _IOWR('d', 106, struct v4l2_sliced_vbi_data)
 232
 233 /* Sets I2S speed in bps. This is used to provide a standard way to select I2S
 234    clock used by driving digital audio streams at some board designs.
 235    Usual values for the frequency are 1024000 and 2048000.
 236    If the frequency is not supported, then -EINVAL is returned. */
 237 #define VIDIOC_INT_I2S_CLOCK_FREQ       _IOW ('d', 108, u32)
 238
 239 /* Routing definition, device dependent. It specifies which inputs (if any)
 240    should be routed to which outputs (if any). */
 241 struct v4l2_routing {
 242         u32 input;
 243         u32 output;
 244 };
 245
 246 /* These internal commands should be used to define the inputs and outputs
 247    of an audio/video chip. They will replace the v4l2 API commands
 248    VIDIOC_S/G_INPUT, VIDIOC_S/G_OUTPUT, VIDIOC_S/G_AUDIO and VIDIOC_S/G_AUDOUT
 249    that are meant to be used by the user.
 250    The internal commands should be used to switch inputs/outputs
 251    because only the driver knows how to map a 'Television' input to the precise
 252    input/output routing of an A/D converter, or a DSP, or a video digitizer.
 253    These four commands should only be sent directly to an i2c device, they
 254    should not be broadcast as the routing is very device specific. */
 255 #define VIDIOC_INT_S_AUDIO_ROUTING      _IOW ('d', 109, struct v4l2_routing)
 256 #define VIDIOC_INT_G_AUDIO_ROUTING      _IOR ('d', 110, struct v4l2_routing)
 257 #define VIDIOC_INT_S_VIDEO_ROUTING      _IOW ('d', 111, struct v4l2_routing)
 258 #define VIDIOC_INT_G_VIDEO_ROUTING      _IOR ('d', 112, struct v4l2_routing)
 259
 260 struct v4l2_crystal_freq {
 261         u32 freq;       /* frequency in Hz of the crystal */
 262         u32 flags;      /* device specific flags */
 263 };
 264
 265 /* Sets the frequency of the crystal used to generate the clocks.
 266    An extra flags field allows device specific configuration regarding
 267    clock frequency dividers, etc. If not used, then set flags to 0.
 268    If the frequency is not supported, then -EINVAL is returned. */
 269 #define VIDIOC_INT_S_CRYSTAL_FREQ       _IOW('d', 113, struct v4l2_crystal_freq)
 270
 271 /* Initialize the sensor registors to some sort of reasonable
 272    default values. */
 273 #define VIDIOC_INT_INIT                 _IOW('d', 114, u32)
 274
 275 /* Set v4l2_std_id for video OUTPUT devices. This is ignored by
 276    video input devices. */
 277 #define VIDIOC_INT_S_STD_OUTPUT         _IOW('d', 115, v4l2_std_id)
 278
 279 /* Get v4l2_std_id for video OUTPUT devices. This is ignored by
 280    video input devices. */
 281 #define VIDIOC_INT_G_STD_OUTPUT         _IOW('d', 116, v4l2_std_id)
 282
 283 /* Set GPIO pins. Very simple right now, might need to be extended with
 284    a v4l2_gpio struct if a direction is also needed. */
 285 #define VIDIOC_INT_S_GPIO               _IOW('d', 117, u32)
 286
 287 #endif /* V4L2_COMMON_H_ */