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V4L/DVB (9588): Don't load em28xx audio module for digital-only devices

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Rework the logic so that the em28xx-alsa module does not get loaded for devices
that don't support analog audio (such as the em2874)

Signed-off-by: Devin Heitmueller <devin.heitmueller@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Devin Heitmueller 2008-11-12 02:05:19 -03:00 committed by Mauro Carvalho Chehab
parent 95ea470574
commit 24a613e4b0
3 changed files with 32 additions and 8 deletions
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10
drivers/media/video/em28xx/em28xx-audio.c
View File

@ -426,9 +426,10 @@ static int em28xx_audio_init(struct em28xx *dev)
static int devnr;
int err;
if (dev->has_audio_class) {
if (dev->has_alsa_audio != 1) {
/* This device does not support the extension (in this case
the device is expecting the snd-usb-audio module) */
the device is expecting the snd-usb-audio module or
doesn't have analog audio support at all) */
return 0;
}
@ -480,9 +481,10 @@ static int em28xx_audio_fini(struct em28xx *dev)
if (dev == NULL)
return 0;
if (dev->has_audio_class) {
if (dev->has_alsa_audio != 1) {
/* This device does not support the extension (in this case
the device is expecting the snd-usb-audio module */
the device is expecting the snd-usb-audio module or
doesn't have analog audio support at all) */
return 0;
}

29
drivers/media/video/em28xx/em28xx-video.c
View File

@ -1927,6 +1927,19 @@ static struct video_device *em28xx_vdev_init(struct em28xx *dev,
return vfd;
}
int em28xx_supports_audio_extension(struct em28xx *dev)
{
/* The chip dictates whether we support the Empia analog audio
extension */
switch (dev->chip_id) {
case CHIP_ID_EM2874:
/* Either a digital-only device or provides AC97 audio */
return 0;
case CHIP_ID_EM2883:
default:
return 1;
}
}
static int register_analog_devices(struct em28xx *dev)
{
@ -2121,7 +2134,7 @@ static void request_module_async(struct work_struct *work)
if (dev->has_audio_class)
request_module("snd-usb-audio");
else
else if (dev->has_alsa_audio)
request_module("em28xx-alsa");
if (dev->has_dvb)
@ -2230,9 +2243,6 @@ static int em28xx_usb_probe(struct usb_interface *interface,
}
}
printk(KERN_INFO DRIVER_NAME " %s usb audio class\n",
dev->has_audio_class ? "Has" : "Doesn't have");
/* compute alternate max packet sizes */
uif = udev->actconfig->interface[0];
@ -2271,6 +2281,17 @@ static int em28xx_usb_probe(struct usb_interface *interface,
em28xx_info("Found %s\n", em28xx_boards[dev->model].name);
if (dev->has_audio_class == 0) {
/* We don't have a USB audio class, let's see if we support
ALSA Audio */
dev->has_alsa_audio = em28xx_supports_audio_extension(dev);
if (dev->has_alsa_audio)
printk(KERN_INFO DRIVER_NAME " supports alsa audio\n");
} else {
printk(KERN_INFO DRIVER_NAME " has usb audio class\n");
}
/* save our data pointer in this interface device */
usb_set_intfdata(interface, dev);

1
drivers/media/video/em28xx/em28xx.h
View File

@ -376,6 +376,7 @@ struct em28xx {
unsigned int has_tda9887:1;
unsigned int stream_on:1; /* Locks streams */
unsigned int has_audio_class:1;
unsigned int has_alsa_audio:1;
unsigned int has_12mhz_i2s:1;
unsigned int max_range_640_480:1;
unsigned int has_dvb:1;