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Media Device Allocator API to allows multiple drivers share a media device. This API solves a very common use-case for media devices where one physical device (an USB stick) provides both audio and video. When such media device exposes a standard USB Audio class, a proprietary Video class, two or more independent drivers will share a single physical USB bridge. In such cases, it is necessary to coordinate access to the shared resource. Using this API, drivers can allocate a media device with the shared struct device as the key. Once the media device is allocated by a driver, other drivers can get a reference to it. The media device is released when all the references are released. Change the ALSA driver to use the Media Controller API to share media resources with DVB, and V4L2 drivers on a AU0828 media device. The Media Controller specific initialization is done after sound card is registered. ALSA creates Media interface and entity function graph nodes for Control, Mixer, PCM Playback, and PCM Capture devices. snd_usb_hw_params() will call Media Controller enable source handler interface to request the media resource. If resource request is granted, it will release it from snd_usb_hw_free(). If resource is busy, -EBUSY is returned. Media specific cleanup is done in usb_audio_disconnect(). Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Shuah Khan <shuah@kernel.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
#ifndef __USBAUDIO_H
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#define __USBAUDIO_H
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/*
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* (Tentative) USB Audio Driver for ALSA
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*
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* Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* handling of USB vendor/product ID pairs as 32-bit numbers */
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#define USB_ID(vendor, product) (((vendor) << 16) | (product))
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#define USB_ID_VENDOR(id) ((id) >> 16)
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#define USB_ID_PRODUCT(id) ((u16)(id))
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/*
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*
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*/
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struct media_device;
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struct media_intf_devnode;
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struct snd_usb_audio {
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int index;
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struct usb_device *dev;
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struct snd_card *card;
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struct usb_interface *pm_intf;
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u32 usb_id;
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struct mutex mutex;
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unsigned int autosuspended:1;
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atomic_t active;
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atomic_t shutdown;
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atomic_t usage_count;
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wait_queue_head_t shutdown_wait;
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unsigned int txfr_quirk:1; /* Subframe boundaries on transfers */
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unsigned int tx_length_quirk:1; /* Put length specifier in transfers */
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int num_interfaces;
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int num_suspended_intf;
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int sample_rate_read_error;
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int badd_profile; /* UAC3 BADD profile */
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struct list_head pcm_list; /* list of pcm streams */
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struct list_head ep_list; /* list of audio-related endpoints */
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int pcm_devs;
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struct list_head midi_list; /* list of midi interfaces */
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struct list_head mixer_list; /* list of mixer interfaces */
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int setup; /* from the 'device_setup' module param */
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bool autoclock; /* from the 'autoclock' module param */
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bool keep_iface; /* keep interface/altset after closing
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* or parameter change
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*/
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struct usb_host_interface *ctrl_intf; /* the audio control interface */
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struct media_device *media_dev;
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struct media_intf_devnode *ctl_intf_media_devnode;
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};
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#define usb_audio_err(chip, fmt, args...) \
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dev_err(&(chip)->dev->dev, fmt, ##args)
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#define usb_audio_warn(chip, fmt, args...) \
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dev_warn(&(chip)->dev->dev, fmt, ##args)
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#define usb_audio_info(chip, fmt, args...) \
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dev_info(&(chip)->dev->dev, fmt, ##args)
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#define usb_audio_dbg(chip, fmt, args...) \
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dev_dbg(&(chip)->dev->dev, fmt, ##args)
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/*
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* Information about devices with broken descriptors
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*/
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/* special values for .ifnum */
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#define QUIRK_NO_INTERFACE -2
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#define QUIRK_ANY_INTERFACE -1
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enum quirk_type {
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QUIRK_IGNORE_INTERFACE,
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QUIRK_COMPOSITE,
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QUIRK_AUTODETECT,
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QUIRK_MIDI_STANDARD_INTERFACE,
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QUIRK_MIDI_FIXED_ENDPOINT,
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QUIRK_MIDI_YAMAHA,
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QUIRK_MIDI_ROLAND,
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QUIRK_MIDI_MIDIMAN,
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QUIRK_MIDI_NOVATION,
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QUIRK_MIDI_RAW_BYTES,
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QUIRK_MIDI_EMAGIC,
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QUIRK_MIDI_CME,
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QUIRK_MIDI_AKAI,
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QUIRK_MIDI_US122L,
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QUIRK_MIDI_FTDI,
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QUIRK_MIDI_CH345,
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QUIRK_AUDIO_STANDARD_INTERFACE,
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QUIRK_AUDIO_FIXED_ENDPOINT,
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QUIRK_AUDIO_EDIROL_UAXX,
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QUIRK_AUDIO_ALIGN_TRANSFER,
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QUIRK_AUDIO_STANDARD_MIXER,
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QUIRK_TYPE_COUNT
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};
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struct snd_usb_audio_quirk {
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const char *vendor_name;
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const char *product_name;
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const char *profile_name; /* override the card->longname */
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int16_t ifnum;
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uint16_t type;
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bool shares_media_device;
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const void *data;
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};
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#define combine_word(s) ((*(s)) | ((unsigned int)(s)[1] << 8))
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#define combine_triple(s) (combine_word(s) | ((unsigned int)(s)[2] << 16))
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#define combine_quad(s) (combine_triple(s) | ((unsigned int)(s)[3] << 24))
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int snd_usb_lock_shutdown(struct snd_usb_audio *chip);
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void snd_usb_unlock_shutdown(struct snd_usb_audio *chip);
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extern bool snd_usb_use_vmalloc;
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#endif /* __USBAUDIO_H */
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