mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
d8695bc5b1
A slight refactoring of the registration quirk code. Now it uses the table lookup for easy additions in future. Also the return type was changed to bool, and got a few more comments. Link: https://lore.kernel.org/r/20200325103322.2508-2-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
922 lines
24 KiB
C
922 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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* Many codes borrowed from audio.c by
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* Alan Cox (alan@lxorguk.ukuu.org.uk)
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* Thomas Sailer (sailer@ife.ee.ethz.ch)
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*
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* Audio Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com>
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*
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* NOTES:
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*
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* - the linked URBs would be preferred but not used so far because of
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* the instability of unlinking.
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* - type II is not supported properly. there is no device which supports
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* this type *correctly*. SB extigy looks as if it supports, but it's
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* indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
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*/
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#include <linux/bitops.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/usb.h>
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#include <linux/moduleparam.h>
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#include <linux/mutex.h>
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#include <linux/usb/audio.h>
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#include <linux/usb/audio-v2.h>
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#include <linux/usb/audio-v3.h>
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#include <linux/module.h>
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#include <sound/control.h>
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#include <sound/core.h>
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#include <sound/info.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/initval.h>
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#include "usbaudio.h"
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#include "card.h"
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#include "midi.h"
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#include "mixer.h"
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#include "proc.h"
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#include "quirks.h"
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#include "endpoint.h"
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#include "helper.h"
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#include "debug.h"
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#include "pcm.h"
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#include "format.h"
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#include "power.h"
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#include "stream.h"
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#include "media.h"
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MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
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MODULE_DESCRIPTION("USB Audio");
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MODULE_LICENSE("GPL");
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MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
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static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
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/* Vendor/product IDs for this card */
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static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
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static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
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static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
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static bool ignore_ctl_error;
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static bool autoclock = true;
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static char *quirk_alias[SNDRV_CARDS];
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bool snd_usb_use_vmalloc = true;
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bool snd_usb_skip_validation;
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
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module_param_array(id, charp, NULL, 0444);
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MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
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module_param_array(enable, bool, NULL, 0444);
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MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
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module_param_array(vid, int, NULL, 0444);
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MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
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module_param_array(pid, int, NULL, 0444);
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MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
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module_param_array(device_setup, int, NULL, 0444);
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MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
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module_param(ignore_ctl_error, bool, 0444);
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MODULE_PARM_DESC(ignore_ctl_error,
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"Ignore errors from USB controller for mixer interfaces.");
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module_param(autoclock, bool, 0444);
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MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes).");
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module_param_array(quirk_alias, charp, NULL, 0444);
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MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
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module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
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MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
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module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
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MODULE_PARM_DESC(skip_validation, "Skip unit descriptor validation (default: no).");
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/*
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* we keep the snd_usb_audio_t instances by ourselves for merging
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* the all interfaces on the same card as one sound device.
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*/
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static DEFINE_MUTEX(register_mutex);
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static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
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static struct usb_driver usb_audio_driver;
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/*
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* disconnect streams
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* called from usb_audio_disconnect()
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*/
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static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
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{
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int idx;
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struct snd_usb_substream *subs;
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for (idx = 0; idx < 2; idx++) {
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subs = &as->substream[idx];
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if (!subs->num_formats)
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continue;
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subs->interface = -1;
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subs->data_endpoint = NULL;
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subs->sync_endpoint = NULL;
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}
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}
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static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
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{
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struct usb_device *dev = chip->dev;
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struct usb_host_interface *alts;
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struct usb_interface_descriptor *altsd;
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struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
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if (!iface) {
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dev_err(&dev->dev, "%u:%d : does not exist\n",
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ctrlif, interface);
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return -EINVAL;
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}
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alts = &iface->altsetting[0];
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altsd = get_iface_desc(alts);
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/*
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* Android with both accessory and audio interfaces enabled gets the
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* interface numbers wrong.
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*/
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if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) ||
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chip->usb_id == USB_ID(0x18d1, 0x2d05)) &&
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interface == 0 &&
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altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
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altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) {
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interface = 2;
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iface = usb_ifnum_to_if(dev, interface);
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if (!iface)
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return -EINVAL;
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alts = &iface->altsetting[0];
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altsd = get_iface_desc(alts);
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}
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if (usb_interface_claimed(iface)) {
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dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n",
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ctrlif, interface);
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return -EINVAL;
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}
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if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
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altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
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altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
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int err = __snd_usbmidi_create(chip->card, iface,
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&chip->midi_list, NULL,
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chip->usb_id);
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if (err < 0) {
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dev_err(&dev->dev,
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"%u:%d: cannot create sequencer device\n",
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ctrlif, interface);
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return -EINVAL;
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}
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usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
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return 0;
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}
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if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
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altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
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altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
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dev_dbg(&dev->dev,
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"%u:%d: skipping non-supported interface %d\n",
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ctrlif, interface, altsd->bInterfaceClass);
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/* skip non-supported classes */
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return -EINVAL;
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}
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if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
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dev_err(&dev->dev, "low speed audio streaming not supported\n");
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return -EINVAL;
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}
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if (! snd_usb_parse_audio_interface(chip, interface)) {
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usb_set_interface(dev, interface, 0); /* reset the current interface */
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usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
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}
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return 0;
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}
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/*
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* parse audio control descriptor and create pcm/midi streams
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*/
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static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
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{
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struct usb_device *dev = chip->dev;
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struct usb_host_interface *host_iface;
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struct usb_interface_descriptor *altsd;
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int i, protocol;
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/* find audiocontrol interface */
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host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
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altsd = get_iface_desc(host_iface);
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protocol = altsd->bInterfaceProtocol;
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switch (protocol) {
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default:
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dev_warn(&dev->dev,
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"unknown interface protocol %#02x, assuming v1\n",
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protocol);
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/* fall through */
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case UAC_VERSION_1: {
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struct uac1_ac_header_descriptor *h1;
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int rest_bytes;
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h1 = snd_usb_find_csint_desc(host_iface->extra,
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host_iface->extralen,
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NULL, UAC_HEADER);
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if (!h1 || h1->bLength < sizeof(*h1)) {
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dev_err(&dev->dev, "cannot find UAC_HEADER\n");
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return -EINVAL;
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}
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rest_bytes = (void *)(host_iface->extra +
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host_iface->extralen) - (void *)h1;
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/* just to be sure -- this shouldn't hit at all */
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if (rest_bytes <= 0) {
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dev_err(&dev->dev, "invalid control header\n");
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return -EINVAL;
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}
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if (rest_bytes < sizeof(*h1)) {
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dev_err(&dev->dev, "too short v1 buffer descriptor\n");
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return -EINVAL;
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}
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if (!h1->bInCollection) {
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dev_info(&dev->dev, "skipping empty audio interface (v1)\n");
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return -EINVAL;
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}
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if (rest_bytes < h1->bLength) {
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dev_err(&dev->dev, "invalid buffer length (v1)\n");
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return -EINVAL;
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}
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if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
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dev_err(&dev->dev, "invalid UAC_HEADER (v1)\n");
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return -EINVAL;
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}
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for (i = 0; i < h1->bInCollection; i++)
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snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
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break;
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}
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case UAC_VERSION_2:
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case UAC_VERSION_3: {
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struct usb_interface_assoc_descriptor *assoc =
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usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
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if (!assoc) {
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/*
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* Firmware writers cannot count to three. So to find
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* the IAD on the NuForce UDH-100, also check the next
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* interface.
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*/
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struct usb_interface *iface =
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usb_ifnum_to_if(dev, ctrlif + 1);
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if (iface &&
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iface->intf_assoc &&
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iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO &&
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iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2)
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assoc = iface->intf_assoc;
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}
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if (!assoc) {
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dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n");
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return -EINVAL;
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}
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if (protocol == UAC_VERSION_3) {
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int badd = assoc->bFunctionSubClass;
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if (badd != UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0 &&
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(badd < UAC3_FUNCTION_SUBCLASS_GENERIC_IO ||
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badd > UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE)) {
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dev_err(&dev->dev,
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"Unsupported UAC3 BADD profile\n");
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return -EINVAL;
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}
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chip->badd_profile = badd;
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}
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for (i = 0; i < assoc->bInterfaceCount; i++) {
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int intf = assoc->bFirstInterface + i;
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if (intf != ctrlif)
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snd_usb_create_stream(chip, ctrlif, intf);
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}
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break;
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}
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}
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return 0;
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}
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/*
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* free the chip instance
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*
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* here we have to do not much, since pcm and controls are already freed
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*
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*/
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static void snd_usb_audio_free(struct snd_card *card)
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{
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struct snd_usb_audio *chip = card->private_data;
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struct snd_usb_endpoint *ep, *n;
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list_for_each_entry_safe(ep, n, &chip->ep_list, list)
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snd_usb_endpoint_free(ep);
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mutex_destroy(&chip->mutex);
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if (!atomic_read(&chip->shutdown))
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dev_set_drvdata(&chip->dev->dev, NULL);
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}
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static void usb_audio_make_shortname(struct usb_device *dev,
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struct snd_usb_audio *chip,
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const struct snd_usb_audio_quirk *quirk)
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{
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struct snd_card *card = chip->card;
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if (quirk && quirk->product_name && *quirk->product_name) {
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strlcpy(card->shortname, quirk->product_name,
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sizeof(card->shortname));
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return;
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}
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/* retrieve the device string as shortname */
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if (!dev->descriptor.iProduct ||
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usb_string(dev, dev->descriptor.iProduct,
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card->shortname, sizeof(card->shortname)) <= 0) {
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/* no name available from anywhere, so use ID */
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sprintf(card->shortname, "USB Device %#04x:%#04x",
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USB_ID_VENDOR(chip->usb_id),
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USB_ID_PRODUCT(chip->usb_id));
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}
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strim(card->shortname);
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}
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static void usb_audio_make_longname(struct usb_device *dev,
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struct snd_usb_audio *chip,
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const struct snd_usb_audio_quirk *quirk)
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{
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struct snd_card *card = chip->card;
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int len;
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/* shortcut - if any pre-defined string is given, use it */
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if (quirk && quirk->profile_name && *quirk->profile_name) {
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strlcpy(card->longname, quirk->profile_name,
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sizeof(card->longname));
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return;
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}
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if (quirk && quirk->vendor_name && *quirk->vendor_name) {
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len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
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} else {
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/* retrieve the vendor and device strings as longname */
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if (dev->descriptor.iManufacturer)
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len = usb_string(dev, dev->descriptor.iManufacturer,
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card->longname, sizeof(card->longname));
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else
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len = 0;
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/* we don't really care if there isn't any vendor string */
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}
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if (len > 0) {
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strim(card->longname);
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if (*card->longname)
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strlcat(card->longname, " ", sizeof(card->longname));
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}
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strlcat(card->longname, card->shortname, sizeof(card->longname));
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len = strlcat(card->longname, " at ", sizeof(card->longname));
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if (len < sizeof(card->longname))
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usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
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switch (snd_usb_get_speed(dev)) {
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case USB_SPEED_LOW:
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strlcat(card->longname, ", low speed", sizeof(card->longname));
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break;
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case USB_SPEED_FULL:
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strlcat(card->longname, ", full speed", sizeof(card->longname));
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break;
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case USB_SPEED_HIGH:
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strlcat(card->longname, ", high speed", sizeof(card->longname));
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break;
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case USB_SPEED_SUPER:
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strlcat(card->longname, ", super speed", sizeof(card->longname));
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break;
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case USB_SPEED_SUPER_PLUS:
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strlcat(card->longname, ", super speed plus", sizeof(card->longname));
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break;
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default:
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break;
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}
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}
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/*
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* create a chip instance and set its names.
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*/
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static int snd_usb_audio_create(struct usb_interface *intf,
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struct usb_device *dev, int idx,
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const struct snd_usb_audio_quirk *quirk,
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unsigned int usb_id,
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struct snd_usb_audio **rchip)
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{
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struct snd_card *card;
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struct snd_usb_audio *chip;
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int err;
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char component[14];
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*rchip = NULL;
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switch (snd_usb_get_speed(dev)) {
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case USB_SPEED_LOW:
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case USB_SPEED_FULL:
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case USB_SPEED_HIGH:
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case USB_SPEED_WIRELESS:
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case USB_SPEED_SUPER:
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case USB_SPEED_SUPER_PLUS:
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break;
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default:
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dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev));
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return -ENXIO;
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}
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err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE,
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sizeof(*chip), &card);
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if (err < 0) {
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dev_err(&dev->dev, "cannot create card instance %d\n", idx);
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return err;
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}
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chip = card->private_data;
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mutex_init(&chip->mutex);
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init_waitqueue_head(&chip->shutdown_wait);
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chip->index = idx;
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chip->dev = dev;
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chip->card = card;
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chip->setup = device_setup[idx];
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chip->autoclock = autoclock;
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atomic_set(&chip->active, 1); /* avoid autopm during probing */
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atomic_set(&chip->usage_count, 0);
|
|
atomic_set(&chip->shutdown, 0);
|
|
|
|
chip->usb_id = usb_id;
|
|
INIT_LIST_HEAD(&chip->pcm_list);
|
|
INIT_LIST_HEAD(&chip->ep_list);
|
|
INIT_LIST_HEAD(&chip->midi_list);
|
|
INIT_LIST_HEAD(&chip->mixer_list);
|
|
|
|
card->private_free = snd_usb_audio_free;
|
|
|
|
strcpy(card->driver, "USB-Audio");
|
|
sprintf(component, "USB%04x:%04x",
|
|
USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
|
|
snd_component_add(card, component);
|
|
|
|
usb_audio_make_shortname(dev, chip, quirk);
|
|
usb_audio_make_longname(dev, chip, quirk);
|
|
|
|
snd_usb_audio_create_proc(chip);
|
|
|
|
*rchip = chip;
|
|
return 0;
|
|
}
|
|
|
|
/* look for a matching quirk alias id */
|
|
static bool get_alias_id(struct usb_device *dev, unsigned int *id)
|
|
{
|
|
int i;
|
|
unsigned int src, dst;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) {
|
|
if (!quirk_alias[i] ||
|
|
sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 ||
|
|
src != *id)
|
|
continue;
|
|
dev_info(&dev->dev,
|
|
"device (%04x:%04x): applying quirk alias %04x:%04x\n",
|
|
USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id),
|
|
USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst));
|
|
*id = dst;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static const struct usb_device_id usb_audio_ids[]; /* defined below */
|
|
|
|
/* look for the corresponding quirk */
|
|
static const struct snd_usb_audio_quirk *
|
|
get_alias_quirk(struct usb_device *dev, unsigned int id)
|
|
{
|
|
const struct usb_device_id *p;
|
|
|
|
for (p = usb_audio_ids; p->match_flags; p++) {
|
|
/* FIXME: this checks only vendor:product pair in the list */
|
|
if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) ==
|
|
USB_DEVICE_ID_MATCH_DEVICE &&
|
|
p->idVendor == USB_ID_VENDOR(id) &&
|
|
p->idProduct == USB_ID_PRODUCT(id))
|
|
return (const struct snd_usb_audio_quirk *)p->driver_info;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* probe the active usb device
|
|
*
|
|
* note that this can be called multiple times per a device, when it
|
|
* includes multiple audio control interfaces.
|
|
*
|
|
* thus we check the usb device pointer and creates the card instance
|
|
* only at the first time. the successive calls of this function will
|
|
* append the pcm interface to the corresponding card.
|
|
*/
|
|
static int usb_audio_probe(struct usb_interface *intf,
|
|
const struct usb_device_id *usb_id)
|
|
{
|
|
struct usb_device *dev = interface_to_usbdev(intf);
|
|
const struct snd_usb_audio_quirk *quirk =
|
|
(const struct snd_usb_audio_quirk *)usb_id->driver_info;
|
|
struct snd_usb_audio *chip;
|
|
int i, err;
|
|
struct usb_host_interface *alts;
|
|
int ifnum;
|
|
u32 id;
|
|
|
|
alts = &intf->altsetting[0];
|
|
ifnum = get_iface_desc(alts)->bInterfaceNumber;
|
|
id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
|
|
le16_to_cpu(dev->descriptor.idProduct));
|
|
if (get_alias_id(dev, &id))
|
|
quirk = get_alias_quirk(dev, id);
|
|
if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
|
|
return -ENXIO;
|
|
|
|
err = snd_usb_apply_boot_quirk(dev, intf, quirk, id);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/*
|
|
* found a config. now register to ALSA
|
|
*/
|
|
|
|
/* check whether it's already registered */
|
|
chip = NULL;
|
|
mutex_lock(®ister_mutex);
|
|
for (i = 0; i < SNDRV_CARDS; i++) {
|
|
if (usb_chip[i] && usb_chip[i]->dev == dev) {
|
|
if (atomic_read(&usb_chip[i]->shutdown)) {
|
|
dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n");
|
|
err = -EIO;
|
|
goto __error;
|
|
}
|
|
chip = usb_chip[i];
|
|
atomic_inc(&chip->active); /* avoid autopm */
|
|
break;
|
|
}
|
|
}
|
|
if (! chip) {
|
|
err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id);
|
|
if (err < 0)
|
|
goto __error;
|
|
|
|
/* it's a fresh one.
|
|
* now look for an empty slot and create a new card instance
|
|
*/
|
|
for (i = 0; i < SNDRV_CARDS; i++)
|
|
if (!usb_chip[i] &&
|
|
(vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
|
|
(pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
|
|
if (enable[i]) {
|
|
err = snd_usb_audio_create(intf, dev, i, quirk,
|
|
id, &chip);
|
|
if (err < 0)
|
|
goto __error;
|
|
chip->pm_intf = intf;
|
|
break;
|
|
} else if (vid[i] != -1 || pid[i] != -1) {
|
|
dev_info(&dev->dev,
|
|
"device (%04x:%04x) is disabled\n",
|
|
USB_ID_VENDOR(id),
|
|
USB_ID_PRODUCT(id));
|
|
err = -ENOENT;
|
|
goto __error;
|
|
}
|
|
}
|
|
if (!chip) {
|
|
dev_err(&dev->dev, "no available usb audio device\n");
|
|
err = -ENODEV;
|
|
goto __error;
|
|
}
|
|
}
|
|
dev_set_drvdata(&dev->dev, chip);
|
|
|
|
/*
|
|
* For devices with more than one control interface, we assume the
|
|
* first contains the audio controls. We might need a more specific
|
|
* check here in the future.
|
|
*/
|
|
if (!chip->ctrl_intf)
|
|
chip->ctrl_intf = alts;
|
|
|
|
chip->txfr_quirk = 0;
|
|
err = 1; /* continue */
|
|
if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
|
|
/* need some special handlings */
|
|
err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk);
|
|
if (err < 0)
|
|
goto __error;
|
|
}
|
|
|
|
if (err > 0) {
|
|
/* create normal USB audio interfaces */
|
|
err = snd_usb_create_streams(chip, ifnum);
|
|
if (err < 0)
|
|
goto __error;
|
|
err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error);
|
|
if (err < 0)
|
|
goto __error;
|
|
}
|
|
|
|
/* we are allowed to call snd_card_register() many times, but first
|
|
* check to see if a device needs to skip it or do anything special
|
|
*/
|
|
if (!snd_usb_registration_quirk(chip, ifnum)) {
|
|
err = snd_card_register(chip->card);
|
|
if (err < 0)
|
|
goto __error;
|
|
}
|
|
|
|
if (quirk && quirk->shares_media_device) {
|
|
/* don't want to fail when snd_media_device_create() fails */
|
|
snd_media_device_create(chip, intf);
|
|
}
|
|
|
|
usb_chip[chip->index] = chip;
|
|
chip->num_interfaces++;
|
|
usb_set_intfdata(intf, chip);
|
|
atomic_dec(&chip->active);
|
|
mutex_unlock(®ister_mutex);
|
|
return 0;
|
|
|
|
__error:
|
|
if (chip) {
|
|
/* chip->active is inside the chip->card object,
|
|
* decrement before memory is possibly returned.
|
|
*/
|
|
atomic_dec(&chip->active);
|
|
if (!chip->num_interfaces)
|
|
snd_card_free(chip->card);
|
|
}
|
|
mutex_unlock(®ister_mutex);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* we need to take care of counter, since disconnection can be called also
|
|
* many times as well as usb_audio_probe().
|
|
*/
|
|
static void usb_audio_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct snd_usb_audio *chip = usb_get_intfdata(intf);
|
|
struct snd_card *card;
|
|
struct list_head *p;
|
|
|
|
if (chip == (void *)-1L)
|
|
return;
|
|
|
|
card = chip->card;
|
|
|
|
mutex_lock(®ister_mutex);
|
|
if (atomic_inc_return(&chip->shutdown) == 1) {
|
|
struct snd_usb_stream *as;
|
|
struct snd_usb_endpoint *ep;
|
|
struct usb_mixer_interface *mixer;
|
|
|
|
/* wait until all pending tasks done;
|
|
* they are protected by snd_usb_lock_shutdown()
|
|
*/
|
|
wait_event(chip->shutdown_wait,
|
|
!atomic_read(&chip->usage_count));
|
|
snd_card_disconnect(card);
|
|
/* release the pcm resources */
|
|
list_for_each_entry(as, &chip->pcm_list, list) {
|
|
snd_usb_stream_disconnect(as);
|
|
}
|
|
/* release the endpoint resources */
|
|
list_for_each_entry(ep, &chip->ep_list, list) {
|
|
snd_usb_endpoint_release(ep);
|
|
}
|
|
/* release the midi resources */
|
|
list_for_each(p, &chip->midi_list) {
|
|
snd_usbmidi_disconnect(p);
|
|
}
|
|
/*
|
|
* Nice to check quirk && quirk->shares_media_device and
|
|
* then call the snd_media_device_delete(). Don't have
|
|
* access to the quirk here. snd_media_device_delete()
|
|
* accesses mixer_list
|
|
*/
|
|
snd_media_device_delete(chip);
|
|
|
|
/* release mixer resources */
|
|
list_for_each_entry(mixer, &chip->mixer_list, list) {
|
|
snd_usb_mixer_disconnect(mixer);
|
|
}
|
|
}
|
|
|
|
chip->num_interfaces--;
|
|
if (chip->num_interfaces <= 0) {
|
|
usb_chip[chip->index] = NULL;
|
|
mutex_unlock(®ister_mutex);
|
|
snd_card_free_when_closed(card);
|
|
} else {
|
|
mutex_unlock(®ister_mutex);
|
|
}
|
|
}
|
|
|
|
/* lock the shutdown (disconnect) task and autoresume */
|
|
int snd_usb_lock_shutdown(struct snd_usb_audio *chip)
|
|
{
|
|
int err;
|
|
|
|
atomic_inc(&chip->usage_count);
|
|
if (atomic_read(&chip->shutdown)) {
|
|
err = -EIO;
|
|
goto error;
|
|
}
|
|
err = snd_usb_autoresume(chip);
|
|
if (err < 0)
|
|
goto error;
|
|
return 0;
|
|
|
|
error:
|
|
if (atomic_dec_and_test(&chip->usage_count))
|
|
wake_up(&chip->shutdown_wait);
|
|
return err;
|
|
}
|
|
|
|
/* autosuspend and unlock the shutdown */
|
|
void snd_usb_unlock_shutdown(struct snd_usb_audio *chip)
|
|
{
|
|
snd_usb_autosuspend(chip);
|
|
if (atomic_dec_and_test(&chip->usage_count))
|
|
wake_up(&chip->shutdown_wait);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
int snd_usb_autoresume(struct snd_usb_audio *chip)
|
|
{
|
|
if (atomic_read(&chip->shutdown))
|
|
return -EIO;
|
|
if (atomic_inc_return(&chip->active) == 1)
|
|
return usb_autopm_get_interface(chip->pm_intf);
|
|
return 0;
|
|
}
|
|
|
|
void snd_usb_autosuspend(struct snd_usb_audio *chip)
|
|
{
|
|
if (atomic_read(&chip->shutdown))
|
|
return;
|
|
if (atomic_dec_and_test(&chip->active))
|
|
usb_autopm_put_interface(chip->pm_intf);
|
|
}
|
|
|
|
static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
struct snd_usb_audio *chip = usb_get_intfdata(intf);
|
|
struct snd_usb_stream *as;
|
|
struct usb_mixer_interface *mixer;
|
|
struct list_head *p;
|
|
|
|
if (chip == (void *)-1L)
|
|
return 0;
|
|
|
|
chip->autosuspended = !!PMSG_IS_AUTO(message);
|
|
if (!chip->autosuspended)
|
|
snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
|
|
if (!chip->num_suspended_intf++) {
|
|
list_for_each_entry(as, &chip->pcm_list, list) {
|
|
snd_usb_pcm_suspend(as);
|
|
as->substream[0].need_setup_ep =
|
|
as->substream[1].need_setup_ep = true;
|
|
}
|
|
list_for_each(p, &chip->midi_list)
|
|
snd_usbmidi_suspend(p);
|
|
list_for_each_entry(mixer, &chip->mixer_list, list)
|
|
snd_usb_mixer_suspend(mixer);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume)
|
|
{
|
|
struct snd_usb_audio *chip = usb_get_intfdata(intf);
|
|
struct snd_usb_stream *as;
|
|
struct usb_mixer_interface *mixer;
|
|
struct list_head *p;
|
|
int err = 0;
|
|
|
|
if (chip == (void *)-1L)
|
|
return 0;
|
|
if (--chip->num_suspended_intf)
|
|
return 0;
|
|
|
|
atomic_inc(&chip->active); /* avoid autopm */
|
|
|
|
list_for_each_entry(as, &chip->pcm_list, list) {
|
|
err = snd_usb_pcm_resume(as);
|
|
if (err < 0)
|
|
goto err_out;
|
|
}
|
|
|
|
/*
|
|
* ALSA leaves material resumption to user space
|
|
* we just notify and restart the mixers
|
|
*/
|
|
list_for_each_entry(mixer, &chip->mixer_list, list) {
|
|
err = snd_usb_mixer_resume(mixer, reset_resume);
|
|
if (err < 0)
|
|
goto err_out;
|
|
}
|
|
|
|
list_for_each(p, &chip->midi_list) {
|
|
snd_usbmidi_resume(p);
|
|
}
|
|
|
|
if (!chip->autosuspended)
|
|
snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
|
|
chip->autosuspended = 0;
|
|
|
|
err_out:
|
|
atomic_dec(&chip->active); /* allow autopm after this point */
|
|
return err;
|
|
}
|
|
|
|
static int usb_audio_resume(struct usb_interface *intf)
|
|
{
|
|
return __usb_audio_resume(intf, false);
|
|
}
|
|
|
|
static int usb_audio_reset_resume(struct usb_interface *intf)
|
|
{
|
|
return __usb_audio_resume(intf, true);
|
|
}
|
|
#else
|
|
#define usb_audio_suspend NULL
|
|
#define usb_audio_resume NULL
|
|
#define usb_audio_reset_resume NULL
|
|
#endif /* CONFIG_PM */
|
|
|
|
static const struct usb_device_id usb_audio_ids [] = {
|
|
#include "quirks-table.h"
|
|
{ .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
|
|
.bInterfaceClass = USB_CLASS_AUDIO,
|
|
.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
|
|
{ } /* Terminating entry */
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, usb_audio_ids);
|
|
|
|
/*
|
|
* entry point for linux usb interface
|
|
*/
|
|
|
|
static struct usb_driver usb_audio_driver = {
|
|
.name = "snd-usb-audio",
|
|
.probe = usb_audio_probe,
|
|
.disconnect = usb_audio_disconnect,
|
|
.suspend = usb_audio_suspend,
|
|
.resume = usb_audio_resume,
|
|
.reset_resume = usb_audio_reset_resume,
|
|
.id_table = usb_audio_ids,
|
|
.supports_autosuspend = 1,
|
|
};
|
|
|
|
module_usb_driver(usb_audio_driver);
|