diff options
Diffstat (limited to 'sound/usb/card.c')
| -rw-r--r-- | sound/usb/card.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/sound/usb/card.c b/sound/usb/card.c index 57a8e2d0139f..1a112d3cf210 100644 --- a/sound/usb/card.c +++ b/sound/usb/card.c @@ -2,6 +2,7 @@ * (Tentative) USB Audio Driver for ALSA * * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de> + * Copyright (C) 2012 Freescale Semiconductor, Inc. * * Many codes borrowed from audio.c by * Alan Cox (alan@lxorguk.ukuu.org.uk) @@ -47,6 +48,7 @@ #include <linux/mutex.h> #include <linux/usb/audio.h> #include <linux/usb/audio-v2.h> +#include <linux/switch.h> #include <sound/control.h> #include <sound/core.h> @@ -111,6 +113,15 @@ MODULE_PARM_DESC(ignore_ctl_error, * the all interfaces on the same card as one sound device. */ +struct usb_audio_switch_data { + struct switch_dev sdev; + const char *name_on; + const char *name_off; + const char *state_on; + const char *state_off; +}; + +static struct usb_audio_switch_data *audio_switch_data[SNDRV_CARDS]; static DEFINE_MUTEX(register_mutex); static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; static struct usb_driver usb_audio_driver; @@ -589,16 +600,80 @@ static int usb_audio_probe(struct usb_interface *intf, const struct usb_device_id *id) { void *chip; + struct usb_audio_switch_data *switch_data; + int ret = 0; + struct snd_usb_audio *uchip; + int idx; + struct snd_usb_stream *as; + struct snd_usb_substream *subs; + struct list_head *head; + int state = 0; + chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id); if (chip) { usb_set_intfdata(intf, chip); + uchip = chip; + switch_data = kzalloc(sizeof(struct usb_audio_switch_data), GFP_KERNEL); + if (!switch_data) + return -ENOMEM; + switch_data->sdev.name = "usb_audio"; + ret = switch_dev_register(&switch_data->sdev); + if (ret < 0) + goto err_switch_dev_register; + audio_switch_data[uchip->index] = switch_data; + + list_for_each(head, &uchip->pcm_list) { + as = list_entry(head, struct snd_usb_stream, list); + for (idx = 0; idx < 2; idx++) { + subs = &as->substream[idx]; + if (!subs->num_formats) + continue; + if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) + state |= 0x1; + if (subs->direction == SNDRV_PCM_STREAM_CAPTURE) + state |= 0x2; + } + } + switch_set_state(&switch_data->sdev, state); return 0; } else return -EIO; + + +err_switch_dev_register: + kfree(switch_data); + return 0; } static void usb_audio_disconnect(struct usb_interface *intf) { + struct snd_usb_audio *uchip = usb_get_intfdata(intf); + struct usb_audio_switch_data *switch_data; + int idx; + struct snd_usb_stream *as; + struct snd_usb_substream *subs; + struct list_head *head; + + if (uchip == (void *)-1L) + return; + + if (uchip) { + switch_data = audio_switch_data[uchip->index]; + if (switch_data) { + switch_set_state(&switch_data->sdev, 0); + switch_dev_unregister(&switch_data->sdev); + kfree(switch_data); + } + list_for_each(head, &uchip->pcm_list) { + as = list_entry(head, struct snd_usb_stream, list); + for (idx = 0; idx < 2; idx++) { + subs = &as->substream[idx]; + if (subs->running) + snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_DISCONNECTED); + } + } + } + snd_usb_audio_disconnect(interface_to_usbdev(intf), usb_get_intfdata(intf)); } |