ioctl VIDIOC_S_HW_FREQ_SEEK &manvol; VIDIOC_S_HW_FREQ_SEEK Perform a hardware frequency seek int ioctl int fd int request struct v4l2_hw_freq_seek *argp fd &fd; request VIDIOC_S_HW_FREQ_SEEK argp Start a hardware frequency seek from the current frequency. To do this applications initialize the tuner, type, seek_upward, spacing and wrap_around fields, and zero out the reserved array of a &v4l2-hw-freq-seek; and call the VIDIOC_S_HW_FREQ_SEEK ioctl with a pointer to this structure. This ioctl is supported if the V4L2_CAP_HW_FREQ_SEEK capability is set. &cs-str; __u32 tuner The tuner index number. This is the same value as in the &v4l2-input; tuner field and the &v4l2-tuner; index field. &v4l2-tuner-type; type The tuner type. This is the same value as in the &v4l2-tuner; type field. __u32 seek_upward If non-zero, seek upward from the current frequency, else seek downward. __u32 wrap_around If non-zero, wrap around when at the end of the frequency range, else stop seeking. __u32 spacing If non-zero, defines the hardware seek resolution in Hz. The driver selects the nearest value that is supported by the device. If spacing is zero a reasonable default value is used. __u32 reserved[7] Reserved for future extensions. Applications must set the array to zero. &return-value; EINVAL The tuner index is out of bounds, the wrap_around value is not supported or the value in the type field is wrong. EAGAIN The ioctl timed-out. Try again.