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path: root/drivers/media/video/bw-qcam.c
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Diffstat (limited to 'drivers/media/video/bw-qcam.c')
-rw-r--r--drivers/media/video/bw-qcam.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/media/video/bw-qcam.c b/drivers/media/video/bw-qcam.c
index 6e39e253ce53..ace4ff9ea023 100644
--- a/drivers/media/video/bw-qcam.c
+++ b/drivers/media/video/bw-qcam.c
@@ -495,7 +495,7 @@ static void qc_set(struct qcam_device *q)
val2 = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) *
q->transfer_scale;
}
- val = (val + val2 - 1) / val2;
+ val = DIV_ROUND_UP(val, val2);
qc_command(q, 0x13);
qc_command(q, val);
@@ -651,7 +651,7 @@ static long qc_capture(struct qcam_device * q, char __user *buf, unsigned long l
transperline = q->width * q->bpp;
divisor = (((q->port_mode & QC_MODE_MASK) == QC_BIDIR) ? 24 : 8) *
q->transfer_scale;
- transperline = (transperline + divisor - 1) / divisor;
+ transperline = DIV_ROUND_UP(transperline, divisor);
for (i = 0, yield = yieldlines; i < linestotrans; i++)
{
@@ -894,10 +894,27 @@ static ssize_t qcam_read(struct file *file, char __user *buf,
return len;
}
+static int qcam_exclusive_open(struct inode *inode, struct file *file)
+{
+ struct video_device *dev = video_devdata(file);
+ struct qcam_device *qcam = (struct qcam_device *)dev;
+
+ return test_and_set_bit(0, &qcam->in_use) ? -EBUSY : 0;
+}
+
+static int qcam_exclusive_release(struct inode *inode, struct file *file)
+{
+ struct video_device *dev = video_devdata(file);
+ struct qcam_device *qcam = (struct qcam_device *)dev;
+
+ clear_bit(0, &qcam->in_use);
+ return 0;
+}
+
static const struct file_operations qcam_fops = {
.owner = THIS_MODULE,
- .open = video_exclusive_open,
- .release = video_exclusive_release,
+ .open = qcam_exclusive_open,
+ .release = qcam_exclusive_release,
.ioctl = qcam_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = v4l_compat_ioctl32,
@@ -909,6 +926,7 @@ static struct video_device qcam_template=
{
.name = "Connectix Quickcam",
.fops = &qcam_fops,
+ .release = video_device_release_empty,
};
#define MAX_CAMS 4