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V4L/DVB (10645): vivi: introduce v4l2_device and do several cleanups
- add v4l2_device - remove BKL - make the debug parameter settable on the fly - set bus_info in querycap Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil
Mauro Carvalho Chehab
parent
b016760054
commit
5ab6c9af37
@ -33,12 +33,13 @@
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#include <linux/videodev.h>
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#endif
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#include <linux/interrupt.h>
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#include <media/videobuf-vmalloc.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-ioctl.h>
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#include <linux/kthread.h>
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#include <linux/highmem.h>
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#include <linux/freezer.h>
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#include <media/videobuf-vmalloc.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include "font.h"
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#define VIVI_MODULE_NAME "vivi"
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@ -47,18 +48,32 @@
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#define WAKE_DENOMINATOR 1001
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#define BUFFER_TIMEOUT msecs_to_jiffies(500) /* 0.5 seconds */
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#include "font.h"
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#define VIVI_MAJOR_VERSION 0
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#define VIVI_MINOR_VERSION 5
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#define VIVI_MINOR_VERSION 6
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#define VIVI_RELEASE 0
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#define VIVI_VERSION \
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KERNEL_VERSION(VIVI_MAJOR_VERSION, VIVI_MINOR_VERSION, VIVI_RELEASE)
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/* Declare static vars that will be used as parameters */
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static unsigned int vid_limit = 16; /* Video memory limit, in Mb */
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static int video_nr = -1; /* /dev/videoN, -1 for autodetect */
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static int n_devs = 1; /* Number of virtual devices */
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MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
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MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
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MODULE_LICENSE("Dual BSD/GPL");
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static unsigned video_nr = -1;
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module_param(video_nr, uint, 0644);
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MODULE_PARM_DESC(video_nr, "videoX start number, -1 is autodetect");
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static unsigned n_devs = 1;
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module_param(n_devs, uint, 0644);
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MODULE_PARM_DESC(n_devs, "number of video devices to create");
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static unsigned debug;
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module_param(debug, uint, 0644);
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MODULE_PARM_DESC(debug, "activates debug info");
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static unsigned int vid_limit = 16;
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module_param(vid_limit, uint, 0644);
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MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");
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/* supported controls */
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static struct v4l2_queryctrl vivi_qctrl[] = {
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@ -112,11 +127,8 @@ static struct v4l2_queryctrl vivi_qctrl[] = {
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static int qctl_regs[ARRAY_SIZE(vivi_qctrl)];
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#define dprintk(dev, level, fmt, arg...) \
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do { \
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if (dev->vfd->debug >= (level)) \
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printk(KERN_DEBUG "vivi: " fmt , ## arg); \
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} while (0)
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#define dprintk(dev, level, fmt, arg...) \
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v4l2_dbg(level, debug, &dev->v4l2_dev, fmt, ## arg)
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/* ------------------------------------------------------------------
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Basic structures
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@ -206,6 +218,7 @@ static LIST_HEAD(vivi_devlist);
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struct vivi_dev {
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struct list_head vivi_devlist;
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struct v4l2_device v4l2_dev;
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spinlock_t slock;
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struct mutex mutex;
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@ -656,7 +669,7 @@ static int vivi_start_thread(struct vivi_fh *fh)
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dma_q->kthread = kthread_run(vivi_thread, fh, "vivi");
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if (IS_ERR(dma_q->kthread)) {
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printk(KERN_ERR "vivi: kernel_thread() failed\n");
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v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
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return PTR_ERR(dma_q->kthread);
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}
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/* Wakes thread */
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@ -799,8 +812,12 @@ static struct videobuf_queue_ops vivi_video_qops = {
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *cap)
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{
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struct vivi_fh *fh = priv;
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struct vivi_dev *dev = fh->dev;
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strcpy(cap->driver, "vivi");
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strcpy(cap->card, "vivi");
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strlcpy(cap->bus_info, dev->v4l2_dev.name, sizeof(cap->bus_info));
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cap->version = VIVI_VERSION;
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cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
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V4L2_CAP_STREAMING |
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@ -1124,32 +1141,21 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
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static int vivi_open(struct file *file)
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{
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int minor = video_devdata(file)->minor;
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struct vivi_dev *dev;
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struct vivi_dev *dev = video_drvdata(file);
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struct vivi_fh *fh = NULL;
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int i;
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int retval = 0;
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printk(KERN_DEBUG "vivi: open called (minor=%d)\n", minor);
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lock_kernel();
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list_for_each_entry(dev, &vivi_devlist, vivi_devlist)
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if (dev->vfd->minor == minor)
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goto found;
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unlock_kernel();
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return -ENODEV;
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found:
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mutex_lock(&dev->mutex);
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dev->users++;
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if (dev->users > 1) {
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dev->users--;
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retval = -EBUSY;
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goto unlock;
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mutex_unlock(&dev->mutex);
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return -EBUSY;
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}
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dprintk(dev, 1, "open minor=%d type=%s users=%d\n", minor,
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dprintk(dev, 1, "open /dev/video%d type=%s users=%d\n", dev->vfd->num,
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v4l2_type_names[V4L2_BUF_TYPE_VIDEO_CAPTURE], dev->users);
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/* allocate + initialize per filehandle data */
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@ -1157,14 +1163,11 @@ found:
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if (NULL == fh) {
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dev->users--;
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retval = -ENOMEM;
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goto unlock;
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}
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unlock:
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mutex_unlock(&dev->mutex);
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if (retval) {
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unlock_kernel();
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if (retval)
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return retval;
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}
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file->private_data = fh;
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fh->dev = dev;
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@ -1193,7 +1196,6 @@ unlock:
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sizeof(struct vivi_buffer), fh);
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vivi_start_thread(fh);
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unlock_kernel();
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return 0;
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}
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@ -1249,32 +1251,6 @@ static int vivi_close(struct file *file)
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return 0;
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}
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static int vivi_release(void)
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{
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struct vivi_dev *dev;
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struct list_head *list;
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while (!list_empty(&vivi_devlist)) {
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list = vivi_devlist.next;
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list_del(list);
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dev = list_entry(list, struct vivi_dev, vivi_devlist);
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if (-1 != dev->vfd->minor) {
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printk(KERN_INFO "%s: unregistering /dev/video%d\n",
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VIVI_MODULE_NAME, dev->vfd->num);
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video_unregister_device(dev->vfd);
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} else {
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printk(KERN_INFO "%s: releasing /dev/video%d\n",
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VIVI_MODULE_NAME, dev->vfd->num);
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video_device_release(dev->vfd);
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}
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kfree(dev);
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}
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return 0;
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}
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static int vivi_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct vivi_fh *fh = file->private_data;
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@ -1337,10 +1313,91 @@ static struct video_device vivi_template = {
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.tvnorms = V4L2_STD_525_60,
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.current_norm = V4L2_STD_NTSC_M,
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};
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/* -----------------------------------------------------------------
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Initialization and module stuff
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------------------------------------------------------------------*/
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static int vivi_release(void)
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{
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struct vivi_dev *dev;
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struct list_head *list;
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while (!list_empty(&vivi_devlist)) {
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list = vivi_devlist.next;
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list_del(list);
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dev = list_entry(list, struct vivi_dev, vivi_devlist);
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v4l2_info(&dev->v4l2_dev, "unregistering /dev/video%d\n",
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dev->vfd->num);
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video_unregister_device(dev->vfd);
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v4l2_device_unregister(&dev->v4l2_dev);
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kfree(dev);
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}
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return 0;
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}
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static int __init vivi_create_instance(int i)
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{
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struct vivi_dev *dev;
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struct video_device *vfd;
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int ret;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name),
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"%s-%03d", VIVI_MODULE_NAME, i);
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ret = v4l2_device_register(NULL, &dev->v4l2_dev);
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if (ret)
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goto free_dev;
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/* init video dma queues */
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INIT_LIST_HEAD(&dev->vidq.active);
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init_waitqueue_head(&dev->vidq.wq);
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/* initialize locks */
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spin_lock_init(&dev->slock);
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mutex_init(&dev->mutex);
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ret = -ENOMEM;
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vfd = video_device_alloc();
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if (!vfd)
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goto unreg_dev;
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*vfd = vivi_template;
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ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);
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if (ret < 0)
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goto rel_vdev;
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video_set_drvdata(vfd, dev);
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/* Now that everything is fine, let's add it to device list */
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list_add_tail(&dev->vivi_devlist, &vivi_devlist);
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snprintf(vfd->name, sizeof(vfd->name), "%s (%i)",
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vivi_template.name, vfd->num);
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if (video_nr >= 0)
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video_nr++;
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dev->vfd = vfd;
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v4l2_info(&dev->v4l2_dev, "V4L2 device registered as /dev/video%d\n",
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vfd->num);
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return 0;
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rel_vdev:
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video_device_release(vfd);
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unreg_dev:
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v4l2_device_unregister(&dev->v4l2_dev);
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free_dev:
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kfree(dev);
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return ret;
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}
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/* This routine allocates from 1 to n_devs virtual drivers.
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The real maximum number of virtual drivers will depend on how many drivers
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@ -1349,72 +1406,33 @@ static struct video_device vivi_template = {
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*/
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static int __init vivi_init(void)
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{
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int ret = -ENOMEM, i;
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struct vivi_dev *dev;
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struct video_device *vfd;
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int ret, i;
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if (n_devs <= 0)
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n_devs = 1;
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for (i = 0; i < n_devs; i++) {
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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break;
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/* init video dma queues */
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INIT_LIST_HEAD(&dev->vidq.active);
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init_waitqueue_head(&dev->vidq.wq);
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/* initialize locks */
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spin_lock_init(&dev->slock);
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mutex_init(&dev->mutex);
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vfd = video_device_alloc();
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if (!vfd) {
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kfree(dev);
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break;
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}
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*vfd = vivi_template;
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ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);
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if (ret < 0) {
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video_device_release(vfd);
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kfree(dev);
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/* If some registers succeeded, keep driver */
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ret = vivi_create_instance(i);
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if (ret) {
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/* If some instantiations succeeded, keep driver */
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if (i)
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ret = 0;
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break;
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}
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/* Now that everything is fine, let's add it to device list */
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list_add_tail(&dev->vivi_devlist, &vivi_devlist);
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snprintf(vfd->name, sizeof(vfd->name), "%s (%i)",
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vivi_template.name, vfd->minor);
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if (video_nr >= 0)
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video_nr++;
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dev->vfd = vfd;
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printk(KERN_INFO "%s: V4L2 device registered as /dev/video%d\n",
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VIVI_MODULE_NAME, vfd->num);
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}
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if (ret < 0) {
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vivi_release();
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printk(KERN_INFO "Error %d while loading vivi driver\n", ret);
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} else {
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printk(KERN_INFO "Video Technology Magazine Virtual Video "
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return ret;
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}
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printk(KERN_INFO "Video Technology Magazine Virtual Video "
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"Capture Board ver %u.%u.%u successfully loaded.\n",
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(VIVI_VERSION >> 16) & 0xFF, (VIVI_VERSION >> 8) & 0xFF,
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VIVI_VERSION & 0xFF);
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/* n_devs will reflect the actual number of allocated devices */
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n_devs = i;
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}
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/* n_devs will reflect the actual number of allocated devices */
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n_devs = i;
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return ret;
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}
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@ -1426,19 +1444,3 @@ static void __exit vivi_exit(void)
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module_init(vivi_init);
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module_exit(vivi_exit);
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MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
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MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
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MODULE_LICENSE("Dual BSD/GPL");
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module_param(video_nr, uint, 0444);
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MODULE_PARM_DESC(video_nr, "video iminor start number");
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module_param(n_devs, uint, 0444);
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MODULE_PARM_DESC(n_devs, "number of video devices to create");
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module_param_named(debug, vivi_template.debug, int, 0444);
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MODULE_PARM_DESC(debug, "activates debug info");
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module_param(vid_limit, int, 0644);
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MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");
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