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sound/usb/media.c
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// SPDX-License-Identifier: GPL-2.0 /* * media.c - Media Controller specific ALSA driver code * * Copyright (c) 2019 Shuah Khan <shuah@kernel.org> * */ /* * This file adds Media Controller support to the ALSA driver * to use the Media Controller API to share the tuner with DVB * and V4L2 drivers that control the media device. * * The media device is created based on the existing quirks framework. * Using this approach, the media controller API usage can be added for * a specific device. */ #include <linux/init.h> #include <linux/list.h> #include <linux/mutex.h> #include <linux/slab.h> #include <linux/usb.h> #include <sound/pcm.h> #include <sound/core.h> #include "usbaudio.h" #include "card.h" #include "mixer.h" #include "media.h" int snd_media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm, int stream) { struct media_device *mdev; struct media_ctl *mctl; struct device *pcm_dev = &pcm->streams[stream].dev; u32 intf_type; int ret = 0; u16 mixer_pad; struct media_entity *entity; mdev = subs->stream->chip->media_dev; if (!mdev) return 0; if (subs->media_ctl) return 0; /* allocate media_ctl */ mctl = kzalloc(sizeof(*mctl), GFP_KERNEL); if (!mctl) return -ENOMEM; mctl->media_dev = mdev; if (stream == SNDRV_PCM_STREAM_PLAYBACK) { intf_type = MEDIA_INTF_T_ALSA_PCM_PLAYBACK; mctl->media_entity.function = MEDIA_ENT_F_AUDIO_PLAYBACK; mctl->media_pad.flags = MEDIA_PAD_FL_SOURCE; mixer_pad = 1; } else { intf_type = MEDIA_INTF_T_ALSA_PCM_CAPTURE; mctl->media_entity.function = MEDIA_ENT_F_AUDIO_CAPTURE; mctl->media_pad.flags = MEDIA_PAD_FL_SINK; mixer_pad = 2; } mctl->media_entity.name = pcm->name; media_entity_pads_init(&mctl->media_entity, 1, &mctl->media_pad); ret = media_device_register_entity(mctl->media_dev, &mctl->media_entity); if (ret) goto free_mctl; mctl->intf_devnode = media_devnode_create(mdev, intf_type, 0, MAJOR(pcm_dev->devt), MINOR(pcm_dev->devt)); if (!mctl->intf_devnode) { ret = -ENOMEM; goto unregister_entity; } mctl->intf_link = media_create_intf_link(&mctl->media_entity, &mctl->intf_devnode->intf, MEDIA_LNK_FL_ENABLED); if (!mctl->intf_link) { ret = -ENOMEM; goto devnode_remove; } /* create link between mixer and audio */ media_device_for_each_entity(entity, mdev) { switch (entity->function) { case MEDIA_ENT_F_AUDIO_MIXER: ret = media_create_pad_link(entity, mixer_pad, &mctl->media_entity, 0, MEDIA_LNK_FL_ENABLED); if (ret) goto remove_intf_link; break; } } subs->media_ctl = mctl; return 0; remove_intf_link: media_remove_intf_link(mctl->intf_link); devnode_remove: media_devnode_remove(mctl->intf_devnode); unregister_entity: media_device_unregister_entity(&mctl->media_entity); free_mctl: kfree(mctl); return ret; } void snd_media_stream_delete(struct snd_usb_substream *subs) { struct media_ctl *mctl = subs->media_ctl; if (mctl) { struct media_device *mdev; mdev = mctl->media_dev; if (mdev && media_devnode_is_registered(mdev->devnode)) { media_devnode_remove(mctl->intf_devnode); media_device_unregister_entity(&mctl->media_entity); media_entity_cleanup(&mctl->media_entity); } kfree(mctl); subs->media_ctl = NULL; } } int snd_media_start_pipeline(struct snd_usb_substream *subs) { struct media_ctl *mctl = subs->media_ctl; int ret = 0; if (!mctl) return 0; mutex_lock(&mctl->media_dev->graph_mutex); if (mctl->media_dev->enable_source) ret = mctl->media_dev->enable_source(&mctl->media_entity, &mctl->media_pipe); mutex_unlock(&mctl->media_dev->graph_mutex); return ret; } void snd_media_stop_pipeline(struct snd_usb_substream *subs) { struct media_ctl *mctl = subs->media_ctl; if (!mctl) return; mutex_lock(&mctl->media_dev->graph_mutex); if (mctl->media_dev->disable_source) mctl->media_dev->disable_source(&mctl->media_entity); mutex_unlock(&mctl->media_dev->graph_mutex); } static int snd_media_mixer_init(struct snd_usb_audio *chip) { struct device *ctl_dev = &chip->card->ctl_dev; struct media_intf_devnode *ctl_intf; struct usb_mixer_interface *mixer; struct media_device *mdev = chip->media_dev; struct media_mixer_ctl *mctl; u32 intf_type = MEDIA_INTF_T_ALSA_CONTROL; int ret; if (!mdev) return -ENODEV; ctl_intf = chip->ctl_intf_media_devnode; if (!ctl_intf) { ctl_intf = media_devnode_create(mdev, intf_type, 0, MAJOR(ctl_dev->devt), MINOR(ctl_dev->devt)); if (!ctl_intf) return -ENOMEM; chip->ctl_intf_media_devnode = ctl_intf; } list_for_each_entry(mixer, &chip->mixer_list, list) { if (mixer->media_mixer_ctl) continue; /* allocate media_mixer_ctl */ mctl = kzalloc(sizeof(*mctl), GFP_KERNEL); if (!mctl) return -ENOMEM; mctl->media_dev = mdev; mctl->media_entity.function = MEDIA_ENT_F_AUDIO_MIXER; mctl->media_entity.name = chip->card->mixername; mctl->media_pad[0].flags = MEDIA_PAD_FL_SINK; mctl->media_pad[1].flags = MEDIA_PAD_FL_SOURCE; mctl->media_pad[2].flags = MEDIA_PAD_FL_SOURCE; media_entity_pads_init(&mctl->media_entity, MEDIA_MIXER_PAD_MAX, mctl->media_pad); ret = media_device_register_entity(mctl->media_dev, &mctl->media_entity); if (ret) { kfree(mctl); return ret; } mctl->intf_link = media_create_intf_link(&mctl->media_entity, &ctl_intf->intf, MEDIA_LNK_FL_ENABLED); if (!mctl->intf_link) { media_device_unregister_entity(&mctl->media_entity); media_entity_cleanup(&mctl->media_entity); kfree(mctl); return -ENOMEM; } mctl->intf_devnode = ctl_intf; mixer->media_mixer_ctl = mctl; } return 0; } static void snd_media_mixer_delete(struct snd_usb_audio *chip) { struct usb_mixer_interface *mixer; struct media_device *mdev = chip->media_dev; if (!mdev) return; list_for_each_entry(mixer, &chip->mixer_list, list) { struct media_mixer_ctl *mctl; mctl = mixer->media_mixer_ctl; if (!mixer->media_mixer_ctl) continue; if (media_devnode_is_registered(mdev->devnode)) { media_device_unregister_entity(&mctl->media_entity); media_entity_cleanup(&mctl->media_entity); } kfree(mctl); mixer->media_mixer_ctl = NULL; } if (media_devnode_is_registered(mdev->devnode)) media_devnode_remove(chip->ctl_intf_media_devnode); chip->ctl_intf_media_devnode = NULL; } int snd_media_device_create(struct snd_usb_audio *chip, struct usb_interface *iface) { struct media_device *mdev; struct usb_device *usbdev = interface_to_usbdev(iface); int ret = 0; /* usb-audio driver is probed for each usb interface, and * there are multiple interfaces per device. Avoid calling * media_device_usb_allocate() each time usb_audio_probe() * is called. Do it only once. */ if (chip->media_dev) { mdev = chip->media_dev; goto snd_mixer_init; } mdev = media_device_usb_allocate(usbdev, KBUILD_MODNAME, THIS_MODULE); if (IS_ERR(mdev)) return -ENOMEM; /* save media device - avoid lookups */ chip->media_dev = mdev; snd_mixer_init: /* Create media entities for mixer and control dev */ ret = snd_media_mixer_init(chip); /* media_device might be registered, print error and continue */ if (ret) dev_err(&usbdev->dev, "Couldn't create media mixer entities. Error: %d ", ret); if (!media_devnode_is_registered(mdev->devnode)) { /* dont'register if snd_media_mixer_init() failed */ if (ret) goto create_fail; /* register media_device */ ret = media_device_register(mdev); create_fail: if (ret) { snd_media_mixer_delete(chip); media_device_delete(mdev, KBUILD_MODNAME, THIS_MODULE); /* clear saved media_dev */ chip->media_dev = NULL; dev_err(&usbdev->dev, "Couldn't register media device. Error: %d ", ret); return ret; } } return ret; } void snd_media_device_delete(struct snd_usb_audio *chip) { struct media_device *mdev = chip->media_dev; struct snd_usb_stream *stream; /* release resources */ list_for_each_entry(stream, &chip->pcm_list, list) { snd_media_stream_delete(&stream->substream[0]); snd_media_stream_delete(&stream->substream[1]); } snd_media_mixer_delete(chip); if (mdev) { media_device_delete(mdev, KBUILD_MODNAME, THIS_MODULE); chip->media_dev = NULL; } } |