[ALSA] fm801 - Add mute support for FM-only card with FM801 PCI to tuner bridge

This is improvement of the early support of the FM-only cards where the
fm801 chip represents the PCI to tuner bridge.
The tuner initialization isn't included the mute on as well as mute support
via V4L request. Proposed patch should fix this at least for 64-PCR model.
Signed-off-by: NAndy Shevchenko <andy@smile.org.ua>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@perex.cz>

include/sound/tea575x-tuner.h

@@ -30,6 +30,7 @@ struct snd_tea575x;
 struct snd_tea575x_ops {
 	void (*write)(struct snd_tea575x *tea, unsigned int val);
 	unsigned int (*read)(struct snd_tea575x *tea);
+	void (*mute)(struct snd_tea575x *tea, unsigned int mute);
 };
 
 struct snd_tea575x {

sound/i2c/other/tea575x-tuner.c

@@ -158,6 +158,10 @@ static int snd_tea575x_ioctl(struct inode *inode, struct file *file,
 			struct video_audio v;
 			if(copy_from_user(&v, arg, sizeof(v))) 
 				return -EFAULT;	
+			if (tea->ops->mute)
+				tea->ops->mute(tea,
+					       (v.flags &
+						VIDEO_AUDIO_MUTE) ? 1 : 0);
 			if(v.audio) 
 				return -EINVAL;
 			return 0;
@@ -205,6 +209,10 @@ void snd_tea575x_init(struct snd_tea575x *tea)
 	tea->freq = 90500 * 16;		/* 90.5Mhz default */
 
 	snd_tea575x_set_freq(tea);
+
+	/* mute on init */
+	if (tea->ops->mute)
+		tea->ops->mute(tea, 1);
 }
 
 void snd_tea575x_exit(struct snd_tea575x *tea)

sound/pci/fm801.c

@@ -978,6 +978,27 @@ static unsigned int snd_fm801_tea575x_64pcr_read(struct snd_tea575x *tea)
 	return val;
 }
 
+static void snd_fm801_tea575x_64pcr_mute(struct snd_tea575x *tea,
+					  unsigned int mute)
+{
+	struct fm801 *chip = tea->private_data;
+	unsigned short reg;
+
+	spin_lock_irq(&chip->reg_lock);
+
+	reg = inw(FM801_REG(chip, GPIO_CTRL));
+	if (mute)
+		/* 0xf800 (mute) */
+		reg &= ~FM801_GPIO_GP(TEA_64PCR_WRITE_ENABLE);
+	else
+		/* 0xf802 (unmute) */
+		reg |= FM801_GPIO_GP(TEA_64PCR_WRITE_ENABLE);
+	outw(reg, FM801_REG(chip, GPIO_CTRL));
+	udelay(1);
+
+	spin_unlock_irq(&chip->reg_lock);
+}
+
 static struct snd_tea575x_ops snd_fm801_tea_ops[3] = {
 	{
 		/* 1 = MediaForte 256-PCS */
@@ -993,6 +1014,7 @@ static struct snd_tea575x_ops snd_fm801_tea_ops[3] = {
 		/* 3 = MediaForte 64-PCR */
 		.write = snd_fm801_tea575x_64pcr_write,
 		.read = snd_fm801_tea575x_64pcr_read,
+		.mute = snd_fm801_tea575x_64pcr_mute,
 	}
 };
 #endif