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Message-ID: <s5hmvs7t133.wl-tiwai@suse.de>
Date: Fri, 15 Jan 2016 14:38:08 +0100
From: Takashi Iwai <tiwai@...e.de>
To: "Shuah Khan" <shuahkh@....samsung.com>
Cc: <hans.verkuil@...co.com>, <laurent.pinchart@...asonboard.com>,
<clemens@...isch.de>, <sakari.ailus@...ux.intel.com>,
<javier@....samsung.com>, <mchehab@....samsung.com>,
<alsa-devel@...a-project.org>, <arnd@...db.de>,
<ricard.wanderlof@...s.com>, <labbott@...oraproject.org>,
<chehabrafael@...il.com>, <misterpib@...il.com>,
<prabhakar.csengg@...il.com>, <ricardo.ribalda@...il.com>,
<ruchandani.tina@...il.com>, <takamichiho@...il.com>,
<tvboxspy@...il.com>, <dominic.sacre@....de>, <crope@....fi>,
<julian@...st.de>, <pierre-louis.bossart@...ux.intel.com>,
<corbet@....net>, <joe@...po.co.uk>, <johan@...ud.se>,
<dan.carpenter@...cle.com>, <pawel@...iak.com>,
<p.zabel@...gutronix.de>, <perex@...ex.cz>,
<stefanr@...6.in-berlin.de>, <inki.dae@...sung.com>,
<jh1009.sung@...sung.com>, <k.kozlowski@...sung.com>,
<kyungmin.park@...sung.com>, <m.szyprowski@...sung.com>,
<sw0312.kim@...sung.com>, <elfring@...rs.sourceforge.net>,
<linux-api@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-media@...r.kernel.org>, <linuxbugs@...tgam.net>,
<gtmkramer@...all.nl>, <normalperson@...t.net>, <daniel@...que.org>
Subject: Re: [PATCH v2 26/31] sound/usb: Update ALSA driver to use Managed Media Controller API
On Thu, 14 Jan 2016 20:52:28 +0100,
Shuah Khan wrote:
>
> Change ALSA driver to use Managed Media Managed Controller
> API to share tuner with DVB and V4L2 drivers that control
> AU0828 media device. Media device is created based on a
> newly added field value in the struct snd_usb_audio_quirk.
> Using this approach, the media controller API usage can be
> added for a specific device. In this patch, Media Controller
> API is enabled for AU0828 hw. snd_usb_create_quirk() will
> check this new field, if set will create a media device using
> media_device_get_devres() interface.
>
> media_device_get_devres() will allocate a new media device
> devres or return an existing one, if it finds one.
>
> During probe, media usb driver could have created the media
> device devres. It will then initialze (if necessary) and
> register the media device if it isn't already initialized
> and registered. Media device unregister is done from
> usb_audio_disconnect().
>
> During probe, media usb driver could have created the
> media device devres. It will then register the media
> device if it isn't already registered. Media device
> unregister is done from usb_audio_disconnect().
>
> New structure media_ctl is added to group the new
> fields to support media entity and links. This new
> structure is added to struct snd_usb_substream.
>
> A new entity_notify hook and a new ALSA capture media
> entity are registered from snd_usb_pcm_open() after
> setting up hardware information for the PCM device.
>
> When a new entity is registered, Media Controller API
> interface media_device_register_entity() invokes all
> registered entity_notify hooks for the media device.
> ALSA entity_notify hook parses all the entity list to
> find a link from decoder it ALSA entity. This indicates
> that the bridge driver created a link from decoder to
> ALSA capture entity.
>
> ALSA will attempt to enable the tuner to link the tuner
> to the decoder calling enable_source handler if one is
> provided by the bridge driver prior to starting Media
> pipeline from snd_usb_hw_params(). If enable_source returns
> with tuner busy condition, then snd_usb_hw_params() will fail
> with -EBUSY. Media pipeline is stopped from snd_usb_hw_free().
>
> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
> ---
> Changes since v1: Addressed Takasi Iwai's comments on v1
> - Move config defines to Kconfig and add logic
> to Makefile to conditionally compile media.c
> - Removed extra includes from media.c
> - Added snd_usb_autosuspend() in error leg
> - Removed debug related code that was missed in v1
>
> sound/usb/Kconfig | 7 ++
> sound/usb/Makefile | 4 +
> sound/usb/card.c | 7 ++
> sound/usb/card.h | 1 +
> sound/usb/media.c | 190 +++++++++++++++++++++++++++++++++++++++++++++++
> sound/usb/media.h | 56 ++++++++++++++
> sound/usb/pcm.c | 28 +++++--
> sound/usb/quirks-table.h | 1 +
> sound/usb/quirks.c | 5 ++
> sound/usb/stream.c | 2 +
> sound/usb/usbaudio.h | 1 +
> 11 files changed, 297 insertions(+), 5 deletions(-)
> create mode 100644 sound/usb/media.c
> create mode 100644 sound/usb/media.h
>
> diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig
> index a452ad7..8d5cdab 100644
> --- a/sound/usb/Kconfig
> +++ b/sound/usb/Kconfig
> @@ -15,6 +15,7 @@ config SND_USB_AUDIO
> select SND_RAWMIDI
> select SND_PCM
> select BITREVERSE
> + select SND_USB_AUDIO_USE_MEDIA_CONTROLLER if MEDIA_CONTROLLER && (MEDIA_SUPPORT || MEDIA_SUPPORT_MODULE)
This looks wrong as a Kconfig syntax. "... if MEDIA_CONTROLLER"
should work, I suppose?
Above all, can MEDIA_CONTROLLER be tristate? It's currently a bool.
If it's a tristate, it causes a problem wrt dependency. Imagine
USB-audio is built-in while MC is a module.
> help
> Say Y here to include support for USB audio and USB MIDI
> devices.
> @@ -22,6 +23,12 @@ config SND_USB_AUDIO
> To compile this driver as a module, choose M here: the module
> will be called snd-usb-audio.
>
> +config SND_USB_AUDIO_USE_MEDIA_CONTROLLER
> + bool "USB Audio/MIDI driver with Media Controller Support"
> + depends on SND_USB_AUDIO && MEDIA_CONTROLLER
> + depends on MEDIA_SUPPORT || MEDIA_SUPPORT_MODULE
Hmm, it's superfluous to have both this depends and the reverse-select
of the above. (And again MEDIA_SUPPORT_MODULE looks bogus.)
> + default y
> +
> config SND_USB_UA101
> tristate "Edirol UA-101/UA-1000 driver"
> select SND_PCM
> diff --git a/sound/usb/Makefile b/sound/usb/Makefile
> index 2d2d122..3113c45 100644
> --- a/sound/usb/Makefile
> +++ b/sound/usb/Makefile
> @@ -15,6 +15,10 @@ snd-usb-audio-objs := card.o \
> quirks.o \
> stream.o
>
> +ifeq ($(CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER),y)
> + snd-usb-audio-objs += media.o
> +endif
A better form is like
snd-usb-audio-$(CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER) += media.
> +
> snd-usbmidi-lib-objs := midi.o
>
> # Toplevel Module Dependency
> diff --git a/sound/usb/card.c b/sound/usb/card.c
> index 18f5664..1a63851 100644
> --- a/sound/usb/card.c
> +++ b/sound/usb/card.c
> @@ -66,6 +66,7 @@
> #include "format.h"
> #include "power.h"
> #include "stream.h"
> +#include "media.h"
>
> MODULE_AUTHOR("Takashi Iwai <tiwai@...e.de>");
> MODULE_DESCRIPTION("USB Audio");
> @@ -621,6 +622,12 @@ static void usb_audio_disconnect(struct usb_interface *intf)
> list_for_each_entry(mixer, &chip->mixer_list, list) {
> snd_usb_mixer_disconnect(mixer);
> }
> + /*
> + * Nice to check quirk && quirk->media_device
> + * need some special handlings. Doesn't look like
> + * we have access to quirk here
> + */
> + media_device_delete(intf);
> }
>
> chip->num_interfaces--;
> diff --git a/sound/usb/card.h b/sound/usb/card.h
> index 71778ca..c15a03c 100644
> --- a/sound/usb/card.h
> +++ b/sound/usb/card.h
> @@ -156,6 +156,7 @@ struct snd_usb_substream {
> } dsd_dop;
>
> bool trigger_tstamp_pending_update; /* trigger timestamp being updated from initial estimate */
> + void *media_ctl;
> };
>
> struct snd_usb_stream {
> diff --git a/sound/usb/media.c b/sound/usb/media.c
> new file mode 100644
> index 0000000..644b6e8
> --- /dev/null
> +++ b/sound/usb/media.c
> @@ -0,0 +1,190 @@
> +/*
> + * media.c - Media Controller specific ALSA driver code
> + *
> + * Copyright (c) 2015 Shuah Khan <shuahkh@....samsung.com>
> + * Copyright (c) 2015 Samsung Electronics Co., Ltd.
> + *
> + * This file is released under the GPLv2.
> + */
> +
> +/*
> + * This file adds Media Controller support to ALSA driver
> + * to use the Media Controller API to share tuner with DVB
> + * and V4L2 drivers that control media device. Media device
> + * is created based on 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 "usbaudio.h"
> +#include "card.h"
> +#include "media.h"
> +
> +int 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;
> +
> + mdev = media_device_get_devres(&usbdev->dev);
> + if (!mdev)
> + return -ENOMEM;
> + if (!mdev->dev) {
> + /* register media device */
> + mdev->dev = &usbdev->dev;
> + if (usbdev->product)
> + strlcpy(mdev->model, usbdev->product,
> + sizeof(mdev->model));
> + if (usbdev->serial)
> + strlcpy(mdev->serial, usbdev->serial,
> + sizeof(mdev->serial));
> + strcpy(mdev->bus_info, usbdev->devpath);
> + mdev->hw_revision = le16_to_cpu(usbdev->descriptor.bcdDevice);
> + ret = media_device_init(mdev);
> + if (ret) {
> + dev_err(&usbdev->dev,
> + "Couldn't create a media device. Error: %d\n",
> + ret);
> + return ret;
> + }
> + }
> + if (!media_devnode_is_registered(&mdev->devnode)) {
> + ret = media_device_register(mdev);
> + if (ret) {
> + dev_err(&usbdev->dev,
> + "Couldn't register media device. Error: %d\n",
> + ret);
> + return ret;
> + }
> + }
> + return 0;
> +}
> +
> +void media_device_delete(struct usb_interface *iface)
> +{
> + struct media_device *mdev;
> + struct usb_device *usbdev = interface_to_usbdev(iface);
> +
> + mdev = media_device_find_devres(&usbdev->dev);
> + if (mdev && media_devnode_is_registered(&mdev->devnode))
> + media_device_unregister(mdev);
> +}
> +
> +static int media_enable_source(struct media_ctl *mctl)
> +{
> + if (mctl && mctl->media_dev->enable_source)
> + return mctl->media_dev->enable_source(&mctl->media_entity,
> + &mctl->media_pipe);
> + return 0;
> +}
> +
> +static void media_disable_source(struct media_ctl *mctl)
> +{
> + if (mctl && mctl->media_dev->disable_source)
> + mctl->media_dev->disable_source(&mctl->media_entity);
> +}
> +
> +int 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;
> +
> + mdev = media_device_find_devres(&subs->dev->dev);
> + if (!mdev)
> + return -ENODEV;
> +
> + 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;
> + } else {
> + intf_type = MEDIA_INTF_T_ALSA_PCM_CAPTURE;
> + mctl->media_entity.function = MEDIA_ENT_F_AUDIO_CAPTURE;
> + }
> + mctl->media_entity.name = pcm->name;
> + mctl->media_entity.info.dev.major = MAJOR(pcm_dev->devt);
> + mctl->media_entity.info.dev.minor = MINOR(pcm_dev->devt);
> + mctl->media_pad.flags = MEDIA_PAD_FL_SINK;
> + media_entity_pads_init(&mctl->media_entity, 1, &mctl->media_pad);
> + ret = media_device_register_entity(mctl->media_dev,
> + &mctl->media_entity);
> + if (ret) {
> + kfree(mctl);
> + return ret;
> + }
> + mctl->intf_devnode = media_devnode_create(mdev, intf_type, 0,
> + MAJOR(pcm_dev->devt),
> + MINOR(pcm_dev->devt));
> + if (!mctl->intf_devnode) {
> + media_device_unregister_entity(&mctl->media_entity);
> + kfree(mctl);
> + return -ENOMEM;
> + }
> + mctl->intf_link = media_create_intf_link(&mctl->media_entity,
> + &mctl->intf_devnode->intf,
> + MEDIA_LNK_FL_ENABLED);
> + if (!mctl->intf_link) {
> + media_devnode_remove(mctl->intf_devnode);
> + media_device_unregister_entity(&mctl->media_entity);
> + kfree(mctl);
> + return -ENOMEM;
> + }
> + subs->media_ctl = (void *) mctl;
The cast to a void pointer is superfluous.
> + return 0;
> +}
> +
> +void media_stream_delete(struct snd_usb_substream *subs)
> +{
> + struct media_ctl *mctl = (struct media_ctl *) subs->media_ctl;
The cast from a void pointer is superfluous, too.
> +
> + if (mctl && mctl->media_dev) {
> + struct media_device *mdev;
> +
> + mdev = media_device_find_devres(&subs->dev->dev);
> + if (mdev) {
> + 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 media_start_pipeline(struct snd_usb_substream *subs)
> +{
> + struct media_ctl *mctl = (struct media_ctl *) subs->media_ctl;
> +
> + if (mctl)
> + return media_enable_source(mctl);
> + return 0;
> +}
> +
> +void media_stop_pipeline(struct snd_usb_substream *subs)
> +{
> + struct media_ctl *mctl = (struct media_ctl *) subs->media_ctl;
> +
> + if (mctl)
> + media_disable_source(mctl);
> +}
> diff --git a/sound/usb/media.h b/sound/usb/media.h
> new file mode 100644
> index 0000000..00b77e6
> --- /dev/null
> +++ b/sound/usb/media.h
> @@ -0,0 +1,56 @@
> +/*
> + * media.h - Media Controller specific ALSA driver code
> + *
> + * Copyright (c) 2015 Shuah Khan <shuahkh@....samsung.com>
> + * Copyright (c) 2015 Samsung Electronics Co., Ltd.
> + *
> + * This file is released under the GPLv2.
> + */
> +
> +/*
> + * This file adds Media Controller support to ALSA driver
> + * to use the Media Controller API to share tuner with DVB
> + * and V4L2 drivers that control media device. Media device
> + * is created based on existing quirks framework. Using this
> + * approach, the media controller API usage can be added for
> + * a specific device.
> +*/
> +#ifndef __MEDIA_H
> +
> +#if defined(CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER) || \
> + defined(CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER_MODULE)
The kconfig is a bool.
thanks,
Takashi
> +#include <media/media-device.h>
> +#include <media/media-entity.h>
> +
> +struct media_ctl {
> + struct media_device *media_dev;
> + struct media_entity media_entity;
> + struct media_intf_devnode *intf_devnode;
> + struct media_link *intf_link;
> + struct media_pad media_pad;
> + struct media_pipeline media_pipe;
> +};
> +
> +int media_device_create(struct snd_usb_audio *chip,
> + struct usb_interface *iface);
> +void media_device_delete(struct usb_interface *iface);
> +int media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm,
> + int stream);
> +void media_stream_delete(struct snd_usb_substream *subs);
> +int media_start_pipeline(struct snd_usb_substream *subs);
> +void media_stop_pipeline(struct snd_usb_substream *subs);
> +#else
> +static inline int media_device_create(struct snd_usb_audio *chip,
> + struct usb_interface *iface)
> + { return 0; }
> +static inline void media_device_delete(struct usb_interface *iface) { }
> +static inline int media_stream_init(struct snd_usb_substream *subs,
> + struct snd_pcm *pcm, int stream)
> + { return 0; }
> +static inline void media_stream_delete(struct snd_usb_substream *subs) { }
> +static inline int media_start_pipeline(struct snd_usb_substream *subs)
> + { return 0; }
> +static inline void media_stop_pipeline(struct snd_usb_substream *subs) { }
> +#endif
> +#endif /* __MEDIA_H */
> diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
> index 9245f52..c3b8486 100644
> --- a/sound/usb/pcm.c
> +++ b/sound/usb/pcm.c
> @@ -35,6 +35,7 @@
> #include "pcm.h"
> #include "clock.h"
> #include "power.h"
> +#include "media.h"
>
> #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
> #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
> @@ -715,10 +716,14 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
> struct audioformat *fmt;
> int ret;
>
> + ret = media_start_pipeline(subs);
> + if (ret)
> + return ret;
> +
> ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
> params_buffer_bytes(hw_params));
> if (ret < 0)
> - return ret;
> + goto err_ret;
>
> subs->pcm_format = params_format(hw_params);
> subs->period_bytes = params_period_bytes(hw_params);
> @@ -732,22 +737,27 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
> dev_dbg(&subs->dev->dev,
> "cannot set format: format = %#x, rate = %d, channels = %d\n",
> subs->pcm_format, subs->cur_rate, subs->channels);
> - return -EINVAL;
> + ret = -EINVAL;
> + goto err_ret;
> }
>
> ret = snd_usb_lock_shutdown(subs->stream->chip);
> if (ret < 0)
> - return ret;
> + goto err_ret;
> ret = set_format(subs, fmt);
> snd_usb_unlock_shutdown(subs->stream->chip);
> if (ret < 0)
> - return ret;
> + goto err_ret;
>
> subs->interface = fmt->iface;
> subs->altset_idx = fmt->altset_idx;
> subs->need_setup_ep = true;
>
> return 0;
> +
> +err_ret:
> + media_stop_pipeline(subs);
> + return ret;
> }
>
> /*
> @@ -759,6 +769,7 @@ static int snd_usb_hw_free(struct snd_pcm_substream *substream)
> {
> struct snd_usb_substream *subs = substream->runtime->private_data;
>
> + media_stop_pipeline(subs);
> subs->cur_audiofmt = NULL;
> subs->cur_rate = 0;
> subs->period_bytes = 0;
> @@ -1219,6 +1230,7 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
> struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
> struct snd_pcm_runtime *runtime = substream->runtime;
> struct snd_usb_substream *subs = &as->substream[direction];
> + int ret;
>
> subs->interface = -1;
> subs->altset_idx = 0;
> @@ -1232,7 +1244,12 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
> subs->dsd_dop.channel = 0;
> subs->dsd_dop.marker = 1;
>
> - return setup_hw_info(runtime, subs);
> + ret = setup_hw_info(runtime, subs);
> + if (ret == 0)
> + ret = media_stream_init(subs, as->pcm, direction);
> + if (ret)
> + snd_usb_autosuspend(subs->stream->chip);
> + return ret;
> }
>
> static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
> @@ -1241,6 +1258,7 @@ static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
> struct snd_usb_substream *subs = &as->substream[direction];
>
> stop_endpoints(subs, true);
> + media_stop_pipeline(subs);
>
> if (subs->interface >= 0 &&
> !snd_usb_lock_shutdown(subs->stream->chip)) {
> diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
> index 1a1e2e4..8f7b71b 100644
> --- a/sound/usb/quirks-table.h
> +++ b/sound/usb/quirks-table.h
> @@ -2875,6 +2875,7 @@ YAMAHA_DEVICE(0x7010, "UB99"),
> .product_name = pname, \
> .ifnum = QUIRK_ANY_INTERFACE, \
> .type = QUIRK_AUDIO_ALIGN_TRANSFER, \
> + .media_device = 1, \
> } \
> }
>
> diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
> index 5ca80e7..b0d9d13 100644
> --- a/sound/usb/quirks.c
> +++ b/sound/usb/quirks.c
> @@ -36,6 +36,7 @@
> #include "pcm.h"
> #include "clock.h"
> #include "stream.h"
> +#include "media.h"
>
> /*
> * handle the quirks for the contained interfaces
> @@ -545,6 +546,10 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip,
> [QUIRK_AUDIO_STANDARD_MIXER] = create_standard_mixer_quirk,
> };
>
> + if (quirk->media_device) {
> + /* don't want to fail when media_device_create() fails */
> + media_device_create(chip, iface);
> + }
> if (quirk->type < QUIRK_TYPE_COUNT) {
> return quirk_funcs[quirk->type](chip, iface, driver, quirk);
> } else {
> diff --git a/sound/usb/stream.c b/sound/usb/stream.c
> index 8ee14f2..789e515 100644
> --- a/sound/usb/stream.c
> +++ b/sound/usb/stream.c
> @@ -36,6 +36,7 @@
> #include "format.h"
> #include "clock.h"
> #include "stream.h"
> +#include "media.h"
>
> /*
> * free a substream
> @@ -52,6 +53,7 @@ static void free_substream(struct snd_usb_substream *subs)
> kfree(fp);
> }
> kfree(subs->rate_list.list);
> + media_stream_delete(subs);
> }
>
>
> diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
> index 15a1271..e3fac29 100644
> --- a/sound/usb/usbaudio.h
> +++ b/sound/usb/usbaudio.h
> @@ -109,6 +109,7 @@ struct snd_usb_audio_quirk {
> const char *product_name;
> int16_t ifnum;
> uint16_t type;
> + bool media_device;
> const void *data;
> };
>
> --
> 2.5.0
>
>
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