ADV7282A Linux driver for IMX6
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Description
The ADV7282A is a versatile one-chip, multiformat video decoder that automatically detects standard analog baseband video signals and converts them into YCrCb 4:2:2 component video data streams.
The front end includes a four-channel input mux that enables multiple composite video signals to be applied to the ADV7282. The video standards supported by the video processor include PAL B/D/I/G/H, PAL60, PAL M, PAL N, PAL Nc, NTSC M/J, NTSC4.43, and SECAM B/D/G/K/L. The ADV7282 can automatically detect the video standard and process it accordingly.
Testing driver
Verify device tree entry
Execute the command:
ls /proc/device-tree/./soc/aips-bus@02100000/i2c@021a8000/adv7282@21
The output returned is the following:
AVDD-supply DVDD-supply clock-names compatible mclk name pinctrl-names status DOVDD-supply PVDD-supply clocks csi_id mclk_source pinctrl-0 reg
Verify if the driver is loaded
Execute the command:
lsmod
The output returned is the following:
Module Size Used by usb_f_hid 8735 2 usb_f_mass_storage 26774 2 usb_f_acm 4085 2 u_serial 8435 1 usb_f_acm bluetooth 312564 2 compat 76710 1 bluetooth ov5640_camera_mipi_int 21592 0 mxc_v4l2_capture 25620 2 ov5640_camera_mipi_int ipu_bg_overlay_sdc 5297 1 mxc_v4l2_capture adv7282_tvin 9118 0 ipu_still 1763 1 mxc_v4l2_capture ipu_prp_enc 5763 1 mxc_v4l2_capture ipu_csi_enc 3417 1 mxc_v4l2_capture ipu_fg_overlay_sdc 5936 1 mxc_v4l2_capture max9526_tvin 5870 0 v4l2_int_device 1883 4 adv7282_tvin,ov5640_camera_mipi_int,max9526_tvin,mxc_v4l2_capture libcomposite 34265 12 usb_f_acm,usb_f_mass_storage,usb_f_hid configfs 23790 5 usb_f_acm,usb_f_mass_storage,libcomposite,usb_f_hid galcore 366496 0
Video Capture
Normal capture
Execute the command:
GST_DEBUG=3 gst-launch-1.0 imxv4l2videosrc ! imxipuvideotransform ! queue ! imxg2dvideosink async=false sync=false
The output returned is the following: <source lang="bash"> Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock ^Chandling interrupt. Interrupt: Stopping pipeline ... Execution ended after 0:00:05.677681000 Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... [16330.053914] imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_5 = 0x00000001 </syntaxhighlight>
Take a picture:
gst-launch-1.0 imxv4l2videosrc num-buffers=1 ! jpegenc ! filesink location=test.jpg
The output returned is the following:
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
[ 7367.541600] imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_5 = 0x00000001
Got EOS from element "pipeline0".
Execution ended after 0:00:00.073631000
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
Driver input selection control
This is the pipeline used to capture from the Video 1
gst-launch-1.0 imxv4l2videosrc input=1 ! imxipuvideotransform ! queue ! imxg2dvideosink async=false sync=false
This is the pipeline used to capture from the Video 2
gst-launch-1.0 imxv4l2videosrc input=2 ! imxipuvideotransform ! queue ! imxg2dvideosink async=false sync=false
Also you can use v4l2-ctl to select the video input, these are the commands:
v4l2-ctl --set-input 1 v4l2-ctl --set-input 2
This is the expected output:
[ 1795.624535] adv7282 3-0021: Input Ain1
Video input set to 1 (CSI MEM: Camera, no power)
The driver is using VIDIOC_S_INPUT to select the video input. I have created the code below to show the steps required to perform the channel switching.
#include <fcntl.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <linux/videodev2.h>
#include <unistd.h>
int main(int argc, char **argv)
{
int fd;
int input;
const char *device = "/dev/video0";
int ret;
/* Open video device */
fd = open(device, O_RDWR);
if (fd < 0) {
fprintf(stderr, "Failed to open %s: %s\n", device,
strerror(errno));
exit(1);
}
/* Select Input */
input = 1; /* This number can be a 1 or 2 */
ret = ioctl(fd, VIDIOC_S_INPUT, &input);
if (ret == 0) {
printf("Video input set to %d", input);
}
/* Close video device */
close(fd);
if (fd < 0) {
fprintf(stderr, "Failed to close %s: %s\n", device,
strerror(errno));
exit(1);
}
return 0;
}
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