1.25. V4L2 common functions and data structures¶
-
int
v4l2_ctrl_query_fill
(struct v4l2_queryctrl * qctrl, s32 min, s32 max, s32 step, s32 def)¶ Fill in a struct v4l2_queryctrl
Parameters
struct v4l2_queryctrl * qctrl
- pointer to the
struct v4l2_queryctrl
to be filled s32 min
- minimum value for the control
s32 max
- maximum value for the control
s32 step
- control step
s32 def
- default value for the control
Description
Fills the struct v4l2_queryctrl
fields for the query control.
Note
This function assumes that the qctrl->id field is filled.
Returns -EINVAL if the control is not known by the V4L2 core, 0 on success.
-
struct v4l2_subdev *
v4l2_i2c_new_subdev
(struct v4l2_device * v4l2_dev, struct i2c_adapter * adapter, const char * client_type, u8 addr, const unsigned short * probe_addrs)¶ Load an i2c module and return an initialized
struct v4l2_subdev
.
Parameters
struct v4l2_device * v4l2_dev
- pointer to
struct v4l2_device
struct i2c_adapter * adapter
- pointer to struct i2c_adapter
const char * client_type
- name of the chip that’s on the adapter.
u8 addr
- I2C address. If zero, it will use probe_addrs
const unsigned short * probe_addrs
- array with a list of address. The last entry at such
array should be
I2C_CLIENT_END
.
Description
returns a struct v4l2_subdev
pointer.
-
struct v4l2_subdev *
v4l2_i2c_new_subdev_board
(struct v4l2_device * v4l2_dev, struct i2c_adapter * adapter, struct i2c_board_info * info, const unsigned short * probe_addrs)¶ Load an i2c module and return an initialized
struct v4l2_subdev
.
Parameters
struct v4l2_device * v4l2_dev
- pointer to
struct v4l2_device
struct i2c_adapter * adapter
- pointer to struct i2c_adapter
struct i2c_board_info * info
- pointer to struct i2c_board_info used to replace the irq, platform_data and addr arguments.
const unsigned short * probe_addrs
- array with a list of address. The last entry at such
array should be
I2C_CLIENT_END
.
Description
returns a struct v4l2_subdev
pointer.
-
void
v4l2_i2c_subdev_init
(struct v4l2_subdev * sd, struct i2c_client * client, const struct v4l2_subdev_ops * ops)¶ Initializes a
struct v4l2_subdev
with data from an i2c_client struct.
Parameters
struct v4l2_subdev * sd
- pointer to
struct v4l2_subdev
struct i2c_client * client
- pointer to struct i2c_client
const struct v4l2_subdev_ops * ops
- pointer to
struct v4l2_subdev_ops
-
unsigned short
v4l2_i2c_subdev_addr
(struct v4l2_subdev * sd)¶ returns i2c client address of
struct v4l2_subdev
.
Parameters
struct v4l2_subdev * sd
- pointer to
struct v4l2_subdev
Description
Returns the address of an I2C sub-device
-
struct v4l2_subdev *
v4l2_spi_new_subdev
(struct v4l2_device * v4l2_dev, struct spi_master * master, struct spi_board_info * info)¶ Load an spi module and return an initialized
struct v4l2_subdev
.
Parameters
struct v4l2_device * v4l2_dev
- pointer to
struct v4l2_device
. struct spi_master * master
- pointer to struct spi_master.
struct spi_board_info * info
- pointer to struct spi_board_info.
Description
returns a struct v4l2_subdev
pointer.
-
void
v4l2_spi_subdev_init
(struct v4l2_subdev * sd, struct spi_device * spi, const struct v4l2_subdev_ops * ops)¶ Initialize a v4l2_subdev with data from an spi_device struct.
Parameters
struct v4l2_subdev * sd
- pointer to
struct v4l2_subdev
struct spi_device * spi
- pointer to struct spi_device.
const struct v4l2_subdev_ops * ops
- pointer to
struct v4l2_subdev_ops
-
struct
v4l2_ioctl_ops
¶ describe operations for each V4L2 ioctl
Definition
struct v4l2_ioctl_ops {
int (* vidioc_querycap) (struct file *file, void *fh, struct v4l2_capability *cap);
int (* vidioc_enum_fmt_vid_cap) (struct file *file, void *fh, struct v4l2_fmtdesc *f);
int (* vidioc_enum_fmt_vid_overlay) (struct file *file, void *fh, struct v4l2_fmtdesc *f);
int (* vidioc_enum_fmt_vid_out) (struct file *file, void *fh, struct v4l2_fmtdesc *f);
int (* vidioc_enum_fmt_vid_cap_mplane) (struct file *file, void *fh, struct v4l2_fmtdesc *f);
int (* vidioc_enum_fmt_vid_out_mplane) (struct file *file, void *fh, struct v4l2_fmtdesc *f);
int (* vidioc_enum_fmt_sdr_cap) (struct file *file, void *fh, struct v4l2_fmtdesc *f);
int (* vidioc_enum_fmt_sdr_out) (struct file *file, void *fh, struct v4l2_fmtdesc *f);
int (* vidioc_enum_fmt_meta_cap) (struct file *file, void *fh, struct v4l2_fmtdesc *f);
int (* vidioc_g_fmt_vid_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_vid_overlay) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_vid_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_vid_out_overlay) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_vbi_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_vbi_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_sliced_vbi_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_sliced_vbi_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_vid_cap_mplane) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_vid_out_mplane) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_sdr_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_sdr_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_g_fmt_meta_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_vid_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_vid_overlay) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_vid_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_vid_out_overlay) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_vbi_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_vbi_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_sliced_vbi_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_sliced_vbi_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_vid_cap_mplane) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_vid_out_mplane) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_sdr_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_sdr_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_s_fmt_meta_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_vid_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_vid_overlay) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_vid_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_vid_out_overlay) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_vbi_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_vbi_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_sliced_vbi_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_sliced_vbi_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_vid_cap_mplane) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_vid_out_mplane) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_sdr_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_sdr_out) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_try_fmt_meta_cap) (struct file *file, void *fh, struct v4l2_format *f);
int (* vidioc_reqbufs) (struct file *file, void *fh, struct v4l2_requestbuffers *b);
int (* vidioc_querybuf) (struct file *file, void *fh, struct v4l2_buffer *b);
int (* vidioc_qbuf) (struct file *file, void *fh, struct v4l2_buffer *b);
int (* vidioc_expbuf) (struct file *file, void *fh, struct v4l2_exportbuffer *e);
int (* vidioc_dqbuf) (struct file *file, void *fh, struct v4l2_buffer *b);
int (* vidioc_create_bufs) (struct file *file, void *fh, struct v4l2_create_buffers *b);
int (* vidioc_prepare_buf) (struct file *file, void *fh, struct v4l2_buffer *b);
int (* vidioc_overlay) (struct file *file, void *fh, unsigned int i);
int (* vidioc_g_fbuf) (struct file *file, void *fh, struct v4l2_framebuffer *a);
int (* vidioc_s_fbuf) (struct file *file, void *fh, const struct v4l2_framebuffer *a);
int (* vidioc_streamon) (struct file *file, void *fh, enum v4l2_buf_type i);
int (* vidioc_streamoff) (struct file *file, void *fh, enum v4l2_buf_type i);
int (* vidioc_g_std) (struct file *file, void *fh, v4l2_std_id *norm);
int (* vidioc_s_std) (struct file *file, void *fh, v4l2_std_id norm);
int (* vidioc_querystd) (struct file *file, void *fh, v4l2_std_id *a);
int (* vidioc_enum_input) (struct file *file, void *fh, struct v4l2_input *inp);
int (* vidioc_g_input) (struct file *file, void *fh, unsigned int *i);
int (* vidioc_s_input) (struct file *file, void *fh, unsigned int i);
int (* vidioc_enum_output) (struct file *file, void *fh, struct v4l2_output *a);
int (* vidioc_g_output) (struct file *file, void *fh, unsigned int *i);
int (* vidioc_s_output) (struct file *file, void *fh, unsigned int i);
int (* vidioc_queryctrl) (struct file *file, void *fh, struct v4l2_queryctrl *a);
int (* vidioc_query_ext_ctrl) (struct file *file, void *fh, struct v4l2_query_ext_ctrl *a);
int (* vidioc_g_ctrl) (struct file *file, void *fh, struct v4l2_control *a);
int (* vidioc_s_ctrl) (struct file *file, void *fh, struct v4l2_control *a);
int (* vidioc_g_ext_ctrls) (struct file *file, void *fh, struct v4l2_ext_controls *a);
int (* vidioc_s_ext_ctrls) (struct file *file, void *fh, struct v4l2_ext_controls *a);
int (* vidioc_try_ext_ctrls) (struct file *file, void *fh, struct v4l2_ext_controls *a);
int (* vidioc_querymenu) (struct file *file, void *fh, struct v4l2_querymenu *a);
int (* vidioc_enumaudio) (struct file *file, void *fh, struct v4l2_audio *a);
int (* vidioc_g_audio) (struct file *file, void *fh, struct v4l2_audio *a);
int (* vidioc_s_audio) (struct file *file, void *fh, const struct v4l2_audio *a);
int (* vidioc_enumaudout) (struct file *file, void *fh, struct v4l2_audioout *a);
int (* vidioc_g_audout) (struct file *file, void *fh, struct v4l2_audioout *a);
int (* vidioc_s_audout) (struct file *file, void *fh, const struct v4l2_audioout *a);
int (* vidioc_g_modulator) (struct file *file, void *fh, struct v4l2_modulator *a);
int (* vidioc_s_modulator) (struct file *file, void *fh, const struct v4l2_modulator *a);
int (* vidioc_cropcap) (struct file *file, void *fh, struct v4l2_cropcap *a);
int (* vidioc_g_crop) (struct file *file, void *fh, struct v4l2_crop *a);
int (* vidioc_s_crop) (struct file *file, void *fh, const struct v4l2_crop *a);
int (* vidioc_g_selection) (struct file *file, void *fh, struct v4l2_selection *s);
int (* vidioc_s_selection) (struct file *file, void *fh, struct v4l2_selection *s);
int (* vidioc_g_jpegcomp) (struct file *file, void *fh, struct v4l2_jpegcompression *a);
int (* vidioc_s_jpegcomp) (struct file *file, void *fh, const struct v4l2_jpegcompression *a);
int (* vidioc_g_enc_index) (struct file *file, void *fh, struct v4l2_enc_idx *a);
int (* vidioc_encoder_cmd) (struct file *file, void *fh, struct v4l2_encoder_cmd *a);
int (* vidioc_try_encoder_cmd) (struct file *file, void *fh, struct v4l2_encoder_cmd *a);
int (* vidioc_decoder_cmd) (struct file *file, void *fh, struct v4l2_decoder_cmd *a);
int (* vidioc_try_decoder_cmd) (struct file *file, void *fh, struct v4l2_decoder_cmd *a);
int (* vidioc_g_parm) (struct file *file, void *fh, struct v4l2_streamparm *a);
int (* vidioc_s_parm) (struct file *file, void *fh, struct v4l2_streamparm *a);
int (* vidioc_g_tuner) (struct file *file, void *fh, struct v4l2_tuner *a);
int (* vidioc_s_tuner) (struct file *file, void *fh, const struct v4l2_tuner *a);
int (* vidioc_g_frequency) (struct file *file, void *fh, struct v4l2_frequency *a);
int (* vidioc_s_frequency) (struct file *file, void *fh, const struct v4l2_frequency *a);
int (* vidioc_enum_freq_bands) (struct file *file, void *fh, struct v4l2_frequency_band *band);
int (* vidioc_g_sliced_vbi_cap) (struct file *file, void *fh, struct v4l2_sliced_vbi_cap *a);
int (* vidioc_log_status) (struct file *file, void *fh);
int (* vidioc_s_hw_freq_seek) (struct file *file, void *fh, const struct v4l2_hw_freq_seek *a);
#ifdef CONFIG_VIDEO_ADV_DEBUG
int (* vidioc_g_register) (struct file *file, void *fh, struct v4l2_dbg_register *reg);
int (* vidioc_s_register) (struct file *file, void *fh, const struct v4l2_dbg_register *reg);
int (* vidioc_g_chip_info) (struct file *file, void *fh, struct v4l2_dbg_chip_info *chip);
#endif
int (* vidioc_enum_framesizes) (struct file *file, void *fh, struct v4l2_frmsizeenum *fsize);
int (* vidioc_enum_frameintervals) (struct file *file, void *fh, struct v4l2_frmivalenum *fival);
int (* vidioc_s_dv_timings) (struct file *file, void *fh, struct v4l2_dv_timings *timings);
int (* vidioc_g_dv_timings) (struct file *file, void *fh, struct v4l2_dv_timings *timings);
int (* vidioc_query_dv_timings) (struct file *file, void *fh, struct v4l2_dv_timings *timings);
int (* vidioc_enum_dv_timings) (struct file *file, void *fh, struct v4l2_enum_dv_timings *timings);
int (* vidioc_dv_timings_cap) (struct file *file, void *fh, struct v4l2_dv_timings_cap *cap);
int (* vidioc_g_edid) (struct file *file, void *fh, struct v4l2_edid *edid);
int (* vidioc_s_edid) (struct file *file, void *fh, struct v4l2_edid *edid);
int (* vidioc_subscribe_event) (struct v4l2_fh *fh, const struct v4l2_event_subscription *sub);
int (* vidioc_unsubscribe_event) (struct v4l2_fh *fh, const struct v4l2_event_subscription *sub);
long (* vidioc_default) (struct file *file, void *fh, bool valid_prio, unsigned int cmd, void *arg);
};
Members
vidioc_querycap
- pointer to the function that implements VIDIOC_QUERYCAP ioctl
vidioc_enum_fmt_vid_cap
- pointer to the function that implements VIDIOC_ENUM_FMT ioctl logic for video capture in single plane mode
vidioc_enum_fmt_vid_overlay
- pointer to the function that implements VIDIOC_ENUM_FMT ioctl logic for video overlay
vidioc_enum_fmt_vid_out
- pointer to the function that implements VIDIOC_ENUM_FMT ioctl logic for video output in single plane mode
vidioc_enum_fmt_vid_cap_mplane
- pointer to the function that implements VIDIOC_ENUM_FMT ioctl logic for video capture in multiplane mode
vidioc_enum_fmt_vid_out_mplane
- pointer to the function that implements VIDIOC_ENUM_FMT ioctl logic for video output in multiplane mode
vidioc_enum_fmt_sdr_cap
- pointer to the function that implements VIDIOC_ENUM_FMT ioctl logic for Software Defined Radio capture
vidioc_enum_fmt_sdr_out
- pointer to the function that implements VIDIOC_ENUM_FMT ioctl logic for Software Defined Radio output
vidioc_enum_fmt_meta_cap
- pointer to the function that implements VIDIOC_ENUM_FMT ioctl logic for metadata capture
vidioc_g_fmt_vid_cap
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for video capture in single plane mode
vidioc_g_fmt_vid_overlay
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for video overlay
vidioc_g_fmt_vid_out
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for video out in single plane mode
vidioc_g_fmt_vid_out_overlay
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for video overlay output
vidioc_g_fmt_vbi_cap
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for raw VBI capture
vidioc_g_fmt_vbi_out
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for raw VBI output
vidioc_g_fmt_sliced_vbi_cap
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for sliced VBI capture
vidioc_g_fmt_sliced_vbi_out
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for sliced VBI output
vidioc_g_fmt_vid_cap_mplane
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for video capture in multiple plane mode
vidioc_g_fmt_vid_out_mplane
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for video out in multiplane plane mode
vidioc_g_fmt_sdr_cap
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for Software Defined Radio capture
vidioc_g_fmt_sdr_out
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for Software Defined Radio output
vidioc_g_fmt_meta_cap
- pointer to the function that implements VIDIOC_G_FMT ioctl logic for metadata capture
vidioc_s_fmt_vid_cap
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for video capture in single plane mode
vidioc_s_fmt_vid_overlay
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for video overlay
vidioc_s_fmt_vid_out
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for video out in single plane mode
vidioc_s_fmt_vid_out_overlay
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for video overlay output
vidioc_s_fmt_vbi_cap
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for raw VBI capture
vidioc_s_fmt_vbi_out
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for raw VBI output
vidioc_s_fmt_sliced_vbi_cap
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for sliced VBI capture
vidioc_s_fmt_sliced_vbi_out
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for sliced VBI output
vidioc_s_fmt_vid_cap_mplane
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for video capture in multiple plane mode
vidioc_s_fmt_vid_out_mplane
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for video out in multiplane plane mode
vidioc_s_fmt_sdr_cap
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for Software Defined Radio capture
vidioc_s_fmt_sdr_out
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for Software Defined Radio output
vidioc_s_fmt_meta_cap
- pointer to the function that implements VIDIOC_S_FMT ioctl logic for metadata capture
vidioc_try_fmt_vid_cap
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for video capture in single plane mode
vidioc_try_fmt_vid_overlay
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for video overlay
vidioc_try_fmt_vid_out
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for video out in single plane mode
vidioc_try_fmt_vid_out_overlay
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for video overlay output
vidioc_try_fmt_vbi_cap
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for raw VBI capture
vidioc_try_fmt_vbi_out
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for raw VBI output
vidioc_try_fmt_sliced_vbi_cap
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for sliced VBI capture
vidioc_try_fmt_sliced_vbi_out
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for sliced VBI output
vidioc_try_fmt_vid_cap_mplane
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for video capture in multiple plane mode
vidioc_try_fmt_vid_out_mplane
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for video out in multiplane plane mode
vidioc_try_fmt_sdr_cap
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for Software Defined Radio capture
vidioc_try_fmt_sdr_out
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for Software Defined Radio output
vidioc_try_fmt_meta_cap
- pointer to the function that implements VIDIOC_TRY_FMT ioctl logic for metadata capture
vidioc_reqbufs
- pointer to the function that implements VIDIOC_REQBUFS ioctl
vidioc_querybuf
- pointer to the function that implements VIDIOC_QUERYBUF ioctl
vidioc_qbuf
- pointer to the function that implements VIDIOC_QBUF ioctl
vidioc_expbuf
- pointer to the function that implements VIDIOC_EXPBUF ioctl
vidioc_dqbuf
- pointer to the function that implements VIDIOC_DQBUF ioctl
vidioc_create_bufs
- pointer to the function that implements VIDIOC_CREATE_BUFS ioctl
vidioc_prepare_buf
- pointer to the function that implements VIDIOC_PREPARE_BUF ioctl
vidioc_overlay
- pointer to the function that implements VIDIOC_OVERLAY ioctl
vidioc_g_fbuf
- pointer to the function that implements VIDIOC_G_FBUF ioctl
vidioc_s_fbuf
- pointer to the function that implements VIDIOC_S_FBUF ioctl
vidioc_streamon
- pointer to the function that implements VIDIOC_STREAMON ioctl
vidioc_streamoff
- pointer to the function that implements VIDIOC_STREAMOFF ioctl
vidioc_g_std
- pointer to the function that implements VIDIOC_G_STD ioctl
vidioc_s_std
- pointer to the function that implements VIDIOC_S_STD ioctl
vidioc_querystd
- pointer to the function that implements VIDIOC_QUERYSTD ioctl
vidioc_enum_input
- pointer to the function that implements VIDIOC_ENUM_INPUT ioctl
vidioc_g_input
- pointer to the function that implements VIDIOC_G_INPUT ioctl
vidioc_s_input
- pointer to the function that implements VIDIOC_S_INPUT ioctl
vidioc_enum_output
- pointer to the function that implements VIDIOC_ENUM_OUTPUT ioctl
vidioc_g_output
- pointer to the function that implements VIDIOC_G_OUTPUT ioctl
vidioc_s_output
- pointer to the function that implements VIDIOC_S_OUTPUT ioctl
vidioc_queryctrl
- pointer to the function that implements VIDIOC_QUERYCTRL ioctl
vidioc_query_ext_ctrl
- pointer to the function that implements VIDIOC_QUERY_EXT_CTRL ioctl
vidioc_g_ctrl
- pointer to the function that implements VIDIOC_G_CTRL ioctl
vidioc_s_ctrl
- pointer to the function that implements VIDIOC_S_CTRL ioctl
vidioc_g_ext_ctrls
- pointer to the function that implements VIDIOC_G_EXT_CTRLS ioctl
vidioc_s_ext_ctrls
- pointer to the function that implements VIDIOC_S_EXT_CTRLS ioctl
vidioc_try_ext_ctrls
- pointer to the function that implements VIDIOC_TRY_EXT_CTRLS ioctl
vidioc_querymenu
- pointer to the function that implements VIDIOC_QUERYMENU ioctl
vidioc_enumaudio
- pointer to the function that implements VIDIOC_ENUMAUDIO ioctl
vidioc_g_audio
- pointer to the function that implements VIDIOC_G_AUDIO ioctl
vidioc_s_audio
- pointer to the function that implements VIDIOC_S_AUDIO ioctl
vidioc_enumaudout
- pointer to the function that implements VIDIOC_ENUMAUDOUT ioctl
vidioc_g_audout
- pointer to the function that implements VIDIOC_G_AUDOUT ioctl
vidioc_s_audout
- pointer to the function that implements VIDIOC_S_AUDOUT ioctl
vidioc_g_modulator
- pointer to the function that implements VIDIOC_G_MODULATOR ioctl
vidioc_s_modulator
- pointer to the function that implements VIDIOC_S_MODULATOR ioctl
vidioc_cropcap
- pointer to the function that implements VIDIOC_CROPCAP ioctl
vidioc_g_crop
- pointer to the function that implements VIDIOC_G_CROP ioctl
vidioc_s_crop
- pointer to the function that implements VIDIOC_S_CROP ioctl
vidioc_g_selection
- pointer to the function that implements VIDIOC_G_SELECTION ioctl
vidioc_s_selection
- pointer to the function that implements VIDIOC_S_SELECTION ioctl
vidioc_g_jpegcomp
- pointer to the function that implements VIDIOC_G_JPEGCOMP ioctl
vidioc_s_jpegcomp
- pointer to the function that implements VIDIOC_S_JPEGCOMP ioctl
vidioc_g_enc_index
- pointer to the function that implements VIDIOC_G_ENC_INDEX ioctl
vidioc_encoder_cmd
- pointer to the function that implements VIDIOC_ENCODER_CMD ioctl
vidioc_try_encoder_cmd
- pointer to the function that implements VIDIOC_TRY_ENCODER_CMD ioctl
vidioc_decoder_cmd
- pointer to the function that implements VIDIOC_DECODER_CMD ioctl
vidioc_try_decoder_cmd
- pointer to the function that implements VIDIOC_TRY_DECODER_CMD ioctl
vidioc_g_parm
- pointer to the function that implements VIDIOC_G_PARM ioctl
vidioc_s_parm
- pointer to the function that implements VIDIOC_S_PARM ioctl
vidioc_g_tuner
- pointer to the function that implements VIDIOC_G_TUNER ioctl
vidioc_s_tuner
- pointer to the function that implements VIDIOC_S_TUNER ioctl
vidioc_g_frequency
- pointer to the function that implements VIDIOC_G_FREQUENCY ioctl
vidioc_s_frequency
- pointer to the function that implements VIDIOC_S_FREQUENCY ioctl
vidioc_enum_freq_bands
- pointer to the function that implements VIDIOC_ENUM_FREQ_BANDS ioctl
vidioc_g_sliced_vbi_cap
- pointer to the function that implements VIDIOC_G_SLICED_VBI_CAP ioctl
vidioc_log_status
- pointer to the function that implements VIDIOC_LOG_STATUS ioctl
vidioc_s_hw_freq_seek
- pointer to the function that implements VIDIOC_S_HW_FREQ_SEEK ioctl
vidioc_g_register
- pointer to the function that implements VIDIOC_DBG_G_REGISTER ioctl
vidioc_s_register
- pointer to the function that implements VIDIOC_DBG_S_REGISTER ioctl
vidioc_g_chip_info
- pointer to the function that implements VIDIOC_DBG_G_CHIP_INFO ioctl
vidioc_enum_framesizes
- pointer to the function that implements VIDIOC_ENUM_FRAMESIZES ioctl
vidioc_enum_frameintervals
- pointer to the function that implements VIDIOC_ENUM_FRAMEINTERVALS ioctl
vidioc_s_dv_timings
- pointer to the function that implements VIDIOC_S_DV_TIMINGS ioctl
vidioc_g_dv_timings
- pointer to the function that implements VIDIOC_G_DV_TIMINGS ioctl
vidioc_query_dv_timings
- pointer to the function that implements VIDIOC_QUERY_DV_TIMINGS ioctl
vidioc_enum_dv_timings
- pointer to the function that implements VIDIOC_ENUM_DV_TIMINGS ioctl
vidioc_dv_timings_cap
- pointer to the function that implements VIDIOC_DV_TIMINGS_CAP ioctl
vidioc_g_edid
- pointer to the function that implements VIDIOC_G_EDID ioctl
vidioc_s_edid
- pointer to the function that implements VIDIOC_S_EDID ioctl
vidioc_subscribe_event
- pointer to the function that implements VIDIOC_SUBSCRIBE_EVENT ioctl
vidioc_unsubscribe_event
- pointer to the function that implements VIDIOC_UNSUBSCRIBE_EVENT ioctl
vidioc_default
- pointed used to allow other ioctls
-
const char *
v4l2_norm_to_name
(v4l2_std_id id)¶ Ancillary routine to analog TV standard name from its ID.
Parameters
v4l2_std_id id
- analog TV standard ID.
Return
returns a string with the name of the analog TV standard. If the standard is not found or if id points to multiple standard, it returns “Unknown”.
-
void
v4l2_video_std_frame_period
(int id, struct v4l2_fract * frameperiod)¶ Ancillary routine that fills a struct
v4l2_fract
pointer with the default framerate fraction.
Parameters
int id
- analog TV sdandard ID.
struct v4l2_fract * frameperiod
- struct
v4l2_fract
pointer to be filled
-
int
v4l2_video_std_construct
(struct v4l2_standard * vs, int id, const char * name)¶ Ancillary routine that fills in the fields of a
v4l2_standard
structure according to the id parameter.
Parameters
struct v4l2_standard * vs
- struct
v4l2_standard
pointer to be filled int id
- analog TV sdandard ID.
const char * name
- name of the standard to be used
Description
Note
This ancillary routine is obsolete. Shouldn’t be used on newer drivers.
-
void
v4l_printk_ioctl
(const char * prefix, unsigned int cmd)¶ Ancillary routine that prints the ioctl in a human-readable format.
Parameters
const char * prefix
- prefix to be added at the ioctl prints.
unsigned int cmd
- ioctl name
Description
Note
If prefix != NULL
, then it will issue a
printk(KERN_DEBUG "``s
: ”, prefix)`` first.
-
struct mutex *
v4l2_ioctl_get_lock
(struct video_device * vdev, unsigned int cmd)¶ get the mutex (if any) that it is need to lock for a given command.
Parameters
struct video_device * vdev
- Pointer to struct
video_device
. unsigned int cmd
- Ioctl name.
Description
Note
Internal use only. Should not be used outside V4L2 core.
-
long int
v4l2_compat_ioctl32
(struct file * file, unsigned int cmd, unsigned long arg)¶ 32 Bits compatibility layer for 64 bits processors
Parameters
struct file * file
- Pointer to struct
file
. unsigned int cmd
- Ioctl name.
unsigned long arg
- Ioctl argument.
-
v4l2_kioctl
¶ Typedef: Typedef used to pass an ioctl handler.
Syntax
long v4l2_kioctl (struct file * file, unsigned int cmd, void * arg);
Parameters
struct file * file
- Pointer to struct
file
. unsigned int cmd
- Ioctl name.
void * arg
- Ioctl argument.
-
long int
video_usercopy
(struct file * file, unsigned int cmd, unsigned long int arg, v4l2_kioctl func)¶ copies data from/to userspace memory when an ioctl is issued.
Parameters
struct file * file
- Pointer to struct
file
. unsigned int cmd
- Ioctl name.
unsigned long int arg
- Ioctl argument.
v4l2_kioctl func
- function that will handle the ioctl
Description
Note
This routine should be used only inside the V4L2 core.
-
long int
video_ioctl2
(struct file * file, unsigned int cmd, unsigned long int arg)¶ Handles a V4L2 ioctl.
Parameters
struct file * file
- Pointer to struct
file
. unsigned int cmd
- Ioctl name.
unsigned long int arg
- Ioctl argument.
Description
Method used to hancle an ioctl. Should be used to fill the
v4l2_ioctl_ops.unlocked_ioctl
on all V4L2 drivers.