From fd3d95608dc1745d714c2422ad72a0f19ce7dc82 Mon Sep 17 00:00:00 2001
From: Hans Verkuil <hverkuil@xs4all.nl>
Date: Sat, 23 Aug 2008 04:52:00 -0300
Subject: [PATCH] --- yaml --- r: 113860 b: refs/heads/master c:
 2f3d00250ae5b1d2727e2723da805290ec408503 h: refs/heads/master v: v3

---
 [refs]                                |  2 +-
 trunk/include/sound/tea575x-tuner.h   |  1 +
 trunk/sound/i2c/other/tea575x-tuner.c | 22 ++++++++++++++++++++--
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index 953b99fa2bd8..503578a35d3e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3ca685aae04960eaa8b2c97baf384996c20cf9ac
+refs/heads/master: 2f3d00250ae5b1d2727e2723da805290ec408503
diff --git a/trunk/include/sound/tea575x-tuner.h b/trunk/include/sound/tea575x-tuner.h
index b62ce3e077f9..b6870cbaf2b3 100644
--- a/trunk/include/sound/tea575x-tuner.h
+++ b/trunk/include/sound/tea575x-tuner.h
@@ -43,6 +43,7 @@ struct snd_tea575x {
 	unsigned int freq_fixup;	/* crystal onboard */
 	unsigned int val;		/* hw value */
 	unsigned long freq;		/* frequency */
+	unsigned long in_use;		/* set if the device is in use */
 	struct snd_tea575x_ops *ops;
 	void *private_data;
 };
diff --git a/trunk/sound/i2c/other/tea575x-tuner.c b/trunk/sound/i2c/other/tea575x-tuner.c
index 83e90057270e..621d7fe3074b 100644
--- a/trunk/sound/i2c/other/tea575x-tuner.c
+++ b/trunk/sound/i2c/other/tea575x-tuner.c
@@ -175,6 +175,23 @@ static void snd_tea575x_release(struct video_device *vfd)
 {
 }
 
+static int snd_tea575x_exclusive_open(struct inode *inode, struct file *file)
+{
+	struct video_device *dev = video_devdata(file);
+	struct snd_tea575x *tea = video_get_drvdata(dev);
+
+	return test_and_set_bit(0, &tea->in_use) ? -EBUSY : 0;
+}
+
+static int snd_tea575x_exclusive_release(struct inode *inode, struct file *file)
+{
+	struct video_device *dev = video_devdata(file);
+	struct snd_tea575x *tea = video_get_drvdata(dev);
+
+	clear_bit(0, &tea->in_use);
+	return 0;
+}
+
 /*
  * initialize all the tea575x chips
  */
@@ -193,9 +210,10 @@ void snd_tea575x_init(struct snd_tea575x *tea)
 	tea->vd.release = snd_tea575x_release;
 	video_set_drvdata(&tea->vd, tea);
 	tea->vd.fops = &tea->fops;
+	tea->in_use = 0;
 	tea->fops.owner = tea->card->module;
-	tea->fops.open = video_exclusive_open;
-	tea->fops.release = video_exclusive_release;
+	tea->fops.open = snd_tea575x_exclusive_open;
+	tea->fops.release = snd_tea575x_exclusive_release;
 	tea->fops.ioctl = snd_tea575x_ioctl;
 	if (video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->dev_nr - 1) < 0) {
 		snd_printk(KERN_ERR "unable to register tea575x tuner\n");