From: John Tsiombikas <nuclear@mutantstargoat.com>
Date: Thu, 11 May 2017 04:39:43 +0000 (+0300)
Subject: almost works, but apparently I need to implement the buffer mode.
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=vdummy;a=commitdiff_plain;h=8a6cb4ffb42e204ed6ed06fede5948974d2cef34

almost works, but apparently I need to implement the buffer mode.
nobody uses read/write mode.
---

diff --git a/vdummy.c b/vdummy.c
index cde798d..55ed4da 100644
--- a/vdummy.c
+++ b/vdummy.c
@@ -7,17 +7,21 @@
 #include <linux/videodev2.h>
 #include <media/v4l2-dev.h>
 #include <media/v4l2-ioctl.h>
+#include <media/v4l2-device.h>
 
 static int init(void);
 static void shutdown(void);
 static int open(struct file *file);
 static int close(struct file *file);
 static ssize_t read(struct file *file, char *ubuf, size_t bufsz, loff_t *offs);
+//static unsigned int poll(struct file *file, struct poll_table_struct *ptab);
 
 static int ioctl_querycap(struct file *file, void *fh, struct v4l2_capability *cap);
 static int ioctl_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *fdesc);
 static int ioctl_get_fmt(struct file *file, void *fh, struct v4l2_format *fmt);
 static int ioctl_set_fmt(struct file *file, void *fh, struct v4l2_format *fmt);
+static int ioctl_get_parm(struct file *file, void *fh, struct v4l2_streamparm *fmt);
+static int ioctl_set_parm(struct file *file, void *fh, struct v4l2_streamparm *fmt);
 static int ioctl_queryctl(struct file *file, void *fh, struct v4l2_queryctrl *ctl);
 
 static int update_frame(int xsz, int ysz);
@@ -30,10 +34,9 @@ MODULE_LICENSE("GPL");
 MODULE_AUTHOR("John Tsiombikas");
 MODULE_DESCRIPTION("v4l2 test module");
 
-#define DEVNAME	"video42"
-
-struct video_device *vdev;
+static struct video_device *vdev;
 
+static struct v4l2_device v4l2_dev;
 static struct v4l2_file_operations fops;
 static struct v4l2_ioctl_ops iops;
 static int width, height;
@@ -45,24 +48,34 @@ static int init(void)
 {
 	int res;
 
+	strcpy(v4l2_dev.name, "vdummy");
+	if((res = v4l2_device_register(0, &v4l2_dev)) != 0) {
+		return res;
+	}
+
 	if(!(vdev = video_device_alloc())) {
 		return -ENOMEM;
 	}
 	vdev->release = video_device_release;
-	strcpy(vdev->name, "video test");
+	strcpy(vdev->name, KBUILD_MODNAME);
 	vdev->fops = &fops;
 	vdev->ioctl_ops = &iops;
 	vdev->vfl_type = VFL_TYPE_GRABBER;
+	vdev->v4l2_dev = &v4l2_dev;
 
+	fops.owner = THIS_MODULE;
 	fops.open = open;
 	fops.release = close;
 	fops.read = read;
+	//fops.poll = poll;
 	fops.unlocked_ioctl = video_ioctl2;
 
 	iops.vidioc_querycap = ioctl_querycap;
 	iops.vidioc_enum_fmt_vid_cap = ioctl_enum_fmt;
 	iops.vidioc_g_fmt_vid_cap = ioctl_get_fmt;
 	iops.vidioc_s_fmt_vid_cap = ioctl_set_fmt;
+	iops.vidioc_g_parm = ioctl_get_parm;
+	iops.vidioc_s_parm = ioctl_set_parm;
 	iops.vidioc_queryctrl = ioctl_queryctl;
 
 	if((res = video_register_device(vdev, VFL_TYPE_GRABBER, -1)) != 0) {
@@ -70,12 +83,14 @@ static int init(void)
 		return res;
 	}
 
+	printk(KERN_INFO "vdummy device initialized\n");
 	return 0;
 }
 
 static void shutdown(void)
 {
 	video_unregister_device(vdev);
+	v4l2_device_unregister(&v4l2_dev);
 	kfree(frame);
 }
 
@@ -113,13 +128,19 @@ static ssize_t read(struct file *file, char *ubuf, size_t ubufsz, loff_t *offs)
 	return sz;
 }
 
+/*
+static unsigned int poll(struct file *file, struct poll_table_struct *ptab)
+{
+}
+*/
+
 static int ioctl_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 {
-	strcpy(cap->driver, "vidtest");
-	strcpy(cap->card, "fake");
+	strcpy(cap->driver, KBUILD_MODNAME);
+	strcpy(cap->card, "dummy v4l2 dev");
 	strcpy(cap->bus_info, "nobus");
-	cap->version = 0;
-	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
+	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
+	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
 	return 0;
 }
 
@@ -158,6 +179,8 @@ static int ioctl_set_fmt(struct file *file, void *fh, struct v4l2_format *fmt)
 {
 	int res;
 
+	printk(KERN_INFO "ioctl_set_fmt called\n");
+
 	if(fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 		return -EINVAL;
 	}
@@ -167,6 +190,28 @@ static int ioctl_set_fmt(struct file *file, void *fh, struct v4l2_format *fmt)
 	return ioctl_get_fmt(file, fh, fmt);
 }
 
+static int ioctl_get_parm(struct file *file, void *fh, struct v4l2_streamparm *parm)
+{
+	if(parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+		return -EINVAL;
+	}
+	parm->parm.capture.capability = 0;
+	parm->parm.capture.capturemode = 0;
+	parm->parm.capture.timeperframe.numerator = 1;
+	parm->parm.capture.timeperframe.denominator = 30;
+	parm->parm.capture.extendedmode = 0;
+	parm->parm.capture.readbuffers = 1;
+	return 0;
+}
+
+static int ioctl_set_parm(struct file *file, void *fh, struct v4l2_streamparm *parm)
+{
+	if(parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+		return -EINVAL;
+	}
+	return ioctl_get_parm(file, fh, parm);
+}
+
 static int ioctl_queryctl(struct file *file, void *fh, struct v4l2_queryctrl *ctl)
 {
 	return -EINVAL;
@@ -176,7 +221,9 @@ static int update_frame(int xsz, int ysz)
 {
 	unsigned char *tmp;
 	int i, j;
-	int new_fsz = xsz * ysz;
+	int new_fsz = xsz * ysz * 3;
+
+	printk(KERN_INFO "update_frame(%d, %d)\n", xsz, ysz);
 
 	if(xsz == width && ysz == height) {
 		return 0;