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 /* Priority helper functions */
  61
  62 struct v4l2_prio_state {
  63         atomic_t prios[4];
  64 };
  65 int v4l2_prio_init(struct v4l2_prio_state *global);
  66 int v4l2_prio_change(struct v4l2_prio_state *global, enum v4l2_priority *local,
  67                      enum v4l2_priority new);
  68 int v4l2_prio_open(struct v4l2_prio_state *global, enum v4l2_priority *local);
  69 int v4l2_prio_close(struct v4l2_prio_state *global, enum v4l2_priority *local);
  70 enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
  71 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local);
  72
  73 /* ------------------------------------------------------------------------- */
  74
  75 /* Control helper functions */
  76
  77 int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl,
  78                 const char **menu_items);
  79 const char *v4l2_ctrl_get_name(u32 id);
  80 const char **v4l2_ctrl_get_menu(u32 id);
  81 int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 step, s32 def);
  82 int v4l2_ctrl_query_fill_std(struct v4l2_queryctrl *qctrl);
  83 int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu,
  84                 struct v4l2_queryctrl *qctrl, const char **menu_items);
  85 #define V4L2_CTRL_MENU_IDS_END (0xffffffff)
  86 int v4l2_ctrl_query_menu_valid_items(struct v4l2_querymenu *qmenu, const u32 *ids);
  87 u32 v4l2_ctrl_next(const u32 * const *ctrl_classes, u32 id);
  88
  89 /* ------------------------------------------------------------------------- */
  90
  91 /* Register/chip ident helper function */
  92
  93 struct i2c_client; /* forward reference */
  94 int v4l2_chip_match_i2c_client(struct i2c_client *c, u32 id_type, u32 chip_id);
  95 int v4l2_chip_ident_i2c_client(struct i2c_client *c, struct v4l2_chip_ident *chip,
  96                 u32 ident, u32 revision);
  97 int v4l2_chip_match_host(u32 id_type, u32 chip_id);
  98
  99 /* ------------------------------------------------------------------------- */
 100
 101 /* Helper function for I2C legacy drivers */
 102
 103 struct i2c_driver;
 104 struct i2c_adapter;
 105 struct i2c_client;
 106 struct i2c_device_id;
 107
 108 int v4l2_i2c_attach(struct i2c_adapter *adapter, int address, struct i2c_driver *driver,
 109                 const char *name,
 110                 int (*probe)(struct i2c_client *, const struct i2c_device_id *));
 111
 112 /* ------------------------------------------------------------------------- */
 113
 114 /* Internal ioctls */
 115
 116 /* VIDIOC_INT_DECODE_VBI_LINE */
 117 struct v4l2_decode_vbi_line {
 118         u32 is_second_field;    /* Set to 0 for the first (odd) field,
 119                                    set to 1 for the second (even) field. */
 120         u8 *p;                  /* Pointer to the sliced VBI data from the decoder.
 121                                    On exit points to the start of the payload. */
 122         u32 line;               /* Line number of the sliced VBI data (1-23) */
 123         u32 type;               /* VBI service type (V4L2_SLICED_*). 0 if no service found */
 124 };
 125
 126 struct v4l2_priv_tun_config {
 127         int tuner;
 128         void *priv;
 129 };
 130
 131 /* audio ioctls */
 132
 133 /* v4l device was opened in Radio mode, to be replaced by VIDIOC_INT_S_TUNER_MODE */
 134 #define AUDC_SET_RADIO        _IO('d',88)
 135
 136 /* tuner ioctls */
 137
 138 /* Sets tuner type and its I2C addr */
 139 #define TUNER_SET_TYPE_ADDR          _IOW('d', 90, int)
 140
 141 /* Puts tuner on powersaving state, disabling it, except for i2c. To be replaced
 142    by VIDIOC_INT_S_STANDBY. */
 143 #define TUNER_SET_STANDBY            _IOW('d', 91, int)
 144
 145 /* Sets tda9887 specific stuff, like port1, port2 and qss */
 146 #define TUNER_SET_CONFIG           _IOW('d', 92, struct v4l2_priv_tun_config)
 147
 148 /* Switch the tuner to a specific tuner mode. Replacement of AUDC_SET_RADIO */
 149 #define VIDIOC_INT_S_TUNER_MODE      _IOW('d', 93, enum v4l2_tuner_type)
 150
 151 /* Generic standby command. Passing -1 (all bits set to 1) will put the whole
 152    chip into standby mode, value 0 will make the chip fully active. Specific
 153    bits can be used by certain chips to enable/disable specific subsystems.
 154    Replacement of TUNER_SET_STANDBY. */
 155 #define VIDIOC_INT_S_STANDBY         _IOW('d', 94, u32)
 156
 157 /* 100, 101 used by  VIDIOC_DBG_[SG]_REGISTER */
 158
 159 /* Generic reset command. The argument selects which subsystems to reset.
 160    Passing 0 will always reset the whole chip. */
 161 #define VIDIOC_INT_RESET                _IOW ('d', 102, u32)
 162
 163 /* Set the frequency (in Hz) of the audio clock output.
 164    Used to slave an audio processor to the video decoder, ensuring that audio
 165    and video remain synchronized.
 166    Usual values for the frequency are 48000, 44100 or 32000 Hz.
 167    If the frequency is not supported, then -EINVAL is returned. */
 168 #define VIDIOC_INT_AUDIO_CLOCK_FREQ     _IOW ('d', 103, u32)
 169
 170 /* Video decoders that support sliced VBI need to implement this ioctl.
 171    Field p of the v4l2_sliced_vbi_line struct is set to the start of the VBI
 172    data that was generated by the decoder. The driver then parses the sliced
 173    VBI data and sets the other fields in the struct accordingly. The pointer p
 174    is updated to point to the start of the payload which can be copied
 175    verbatim into the data field of the v4l2_sliced_vbi_data struct. If no
 176    valid VBI data was found, then the type field is set to 0 on return. */
 177 #define VIDIOC_INT_DECODE_VBI_LINE      _IOWR('d', 104, struct v4l2_decode_vbi_line)
 178
 179 /* Used to generate VBI signals on a video signal. v4l2_sliced_vbi_data is
 180    filled with the data packets that should be output. Note that if you set
 181    the line field to 0, then that VBI signal is disabled. If no
 182    valid VBI data was found, then the type field is set to 0 on return. */
 183 #define VIDIOC_INT_S_VBI_DATA           _IOW ('d', 105, struct v4l2_sliced_vbi_data)
 184
 185 /* Used to obtain the sliced VBI packet from a readback register. Not all
 186    video decoders support this. If no data is available because the readback
 187    register contains invalid or erroneous data -EIO is returned. Note that
 188    you must fill in the 'id' member and the 'field' member (to determine
 189    whether CC data from the first or second field should be obtained). */
 190 #define VIDIOC_INT_G_VBI_DATA           _IOWR('d', 106, struct v4l2_sliced_vbi_data)
 191
 192 /* Sets I2S speed in bps. This is used to provide a standard way to select I2S
 193    clock used by driving digital audio streams at some board designs.
 194    Usual values for the frequency are 1024000 and 2048000.
 195    If the frequency is not supported, then -EINVAL is returned. */
 196 #define VIDIOC_INT_I2S_CLOCK_FREQ       _IOW ('d', 108, u32)
 197
 198 /* Routing definition, device dependent. It specifies which inputs (if any)
 199    should be routed to which outputs (if any). */
 200 struct v4l2_routing {
 201         u32 input;
 202         u32 output;
 203 };
 204
 205 /* These internal commands should be used to define the inputs and outputs
 206    of an audio/video chip. They will replace the v4l2 API commands
 207    VIDIOC_S/G_INPUT, VIDIOC_S/G_OUTPUT, VIDIOC_S/G_AUDIO and VIDIOC_S/G_AUDOUT
 208    that are meant to be used by the user.
 209    The internal commands should be used to switch inputs/outputs
 210    because only the driver knows how to map a 'Television' input to the precise
 211    input/output routing of an A/D converter, or a DSP, or a video digitizer.
 212    These four commands should only be sent directly to an i2c device, they
 213    should not be broadcast as the routing is very device specific. */
 214 #define VIDIOC_INT_S_AUDIO_ROUTING      _IOW ('d', 109, struct v4l2_routing)
 215 #define VIDIOC_INT_G_AUDIO_ROUTING      _IOR ('d', 110, struct v4l2_routing)
 216 #define VIDIOC_INT_S_VIDEO_ROUTING      _IOW ('d', 111, struct v4l2_routing)
 217 #define VIDIOC_INT_G_VIDEO_ROUTING      _IOR ('d', 112, struct v4l2_routing)
 218
 219 struct v4l2_crystal_freq {
 220         u32 freq;       /* frequency in Hz of the crystal */
 221         u32 flags;      /* device specific flags */
 222 };
 223
 224 /* Sets the frequency of the crystal used to generate the clocks.
 225    An extra flags field allows device specific configuration regarding
 226    clock frequency dividers, etc. If not used, then set flags to 0.
 227    If the frequency is not supported, then -EINVAL is returned. */
 228 #define VIDIOC_INT_S_CRYSTAL_FREQ       _IOW('d', 113, struct v4l2_crystal_freq)
 229
 230 /* Initialize the sensor registors to some sort of reasonable
 231    default values. */
 232 #define VIDIOC_INT_INIT                 _IOW('d', 114, u32)
 233
 234 /* Set v4l2_std_id for video OUTPUT devices. This is ignored by
 235    video input devices. */
 236 #define VIDIOC_INT_S_STD_OUTPUT         _IOW('d', 115, v4l2_std_id)
 237
 238 /* Get v4l2_std_id for video OUTPUT devices. This is ignored by
 239    video input devices. */
 240 #define VIDIOC_INT_G_STD_OUTPUT         _IOW('d', 116, v4l2_std_id)
 241
 242 /* Set GPIO pins. Very simple right now, might need to be extended with
 243    a v4l2_gpio struct if a direction is also needed. */
 244 #define VIDIOC_INT_S_GPIO               _IOW('d', 117, u32)
 245
 246 #endif /* V4L2_COMMON_H_ */