diff options
| author | Ravindra Lokhande <rlokhande@nvidia.com> | 2012-07-27 22:36:29 +0530 |
|---|---|---|
| committer | Lokesh Pathak <lpathak@nvidia.com> | 2012-07-30 08:44:11 -0700 |
| commit | 8843c49092b6ed903e88eded1f1c9b9a7f432dfe (patch) | |
| tree | d6933fb561934d61874689da14e53a137b4b65b1 /sound | |
| parent | 20e63194505625691dd93fc613cd4268430f6bc3 (diff) | |
ALSA: usb-audio: register switch device
regsiter android switch device which is used to convey device plug-in
and plug-out to userspace.
Bugs 1009921, 1019877
Change-Id: I8e3c2fce420cc0ce094a6d8f2cf00abb630fcf2f
Reviewed-on: http://git-master/r/119033
Tested-by: Ravindra Lokhande <rlokhande@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Scott Peterson <speterson@nvidia.com>
Reviewed-by: Vijay Mali <vmali@nvidia.com>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/usb/card.c | 49 |
1 files changed, 47 insertions, 2 deletions
diff --git a/sound/usb/card.c b/sound/usb/card.c index d8f2bf401458..fca3f56fbb30 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -35,7 +35,6 @@ * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream). */ - #include <linux/bitops.h> #include <linux/init.h> #include <linux/list.h> @@ -47,6 +46,9 @@ #include <linux/mutex.h> #include <linux/usb/audio.h> #include <linux/usb/audio-v2.h> +#ifdef CONFIG_SWITCH +#include <linux/switch.h> +#endif #include <sound/control.h> #include <sound/core.h> @@ -115,6 +117,18 @@ static DEFINE_MUTEX(register_mutex); static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; static struct usb_driver usb_audio_driver; +#ifdef CONFIG_SWITCH +enum switch_state { + STATE_CONNECTED_UNKNOWN = -1, + STATE_DISCONNECTED = 0, + STATE_CONNECTED = 1 +}; + +static struct switch_dev usb_switch_dev = { + .name = "usb_audio", +}; +#endif + /* * disconnect streams * called from snd_usb_audio_disconnect() @@ -523,10 +537,15 @@ snd_usb_audio_probe(struct usb_device *dev, goto __error; } +#ifdef CONFIG_SWITCH + switch_set_state(&usb_switch_dev, STATE_CONNECTED); +#endif + usb_chip[chip->index] = chip; chip->num_interfaces++; chip->probing = 0; mutex_unlock(®ister_mutex); + return chip; __error: @@ -537,6 +556,7 @@ snd_usb_audio_probe(struct usb_device *dev, } mutex_unlock(®ister_mutex); __err_val: + return NULL; } @@ -558,6 +578,11 @@ static void snd_usb_audio_disconnect(struct usb_device *dev, mutex_lock(&chip->shutdown_mutex); chip->shutdown = 1; chip->num_interfaces--; + +#ifdef CONFIG_SWITCH + switch_set_state(&usb_switch_dev, STATE_DISCONNECTED); +#endif + if (chip->num_interfaces <= 0) { snd_card_disconnect(card); /* release the pcm resources */ @@ -712,15 +737,35 @@ static struct usb_driver usb_audio_driver = { static int __init snd_usb_audio_init(void) { + int err = 0; + if (nrpacks < 1 || nrpacks > MAX_PACKS) { printk(KERN_WARNING "invalid nrpacks value.\n"); return -EINVAL; } - return usb_register(&usb_audio_driver); + +#ifdef CONFIG_SWITCH + /* Add usb_audio swith class support */ + err = switch_dev_register(&usb_switch_dev); + if (err < 0){ + printk(KERN_ERR "failed to register switch device"); + return -EINVAL; + } +#endif + + err = usb_register(&usb_audio_driver); + if (err) { + switch_dev_unregister(&usb_switch_dev); + } + + return err; } static void __exit snd_usb_audio_cleanup(void) { +#ifdef CONFIG_SWITCH + switch_dev_unregister(&usb_switch_dev); +#endif usb_deregister(&usb_audio_driver); } |