Commit 618eabea authored by Takashi Sakamoto's avatar Takashi Sakamoto Committed by Takashi Iwai
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ALSA: bebob: Add hwdep interface



This interface is designed for mixer/control application. By using hwdep
interface, the application can get information about firewire node, can
lock/unlock kernel streaming and can get notification at starting/stopping
kernel streaming.
Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent fbbebd2c
......@@ -95,9 +95,10 @@ enum {
SNDRV_HWDEP_IFACE_USB_STREAM, /* direct access to usb stream */
SNDRV_HWDEP_IFACE_FW_DICE, /* TC DICE FireWire device */
SNDRV_HWDEP_IFACE_FW_FIREWORKS, /* Echo Audio Fireworks based device */
SNDRV_HWDEP_IFACE_FW_BEBOB, /* BridgeCo BeBoB based device */
/* Don't forget to change the following: */
SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_FIREWORKS
SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_BEBOB
};
struct snd_hwdep_info {
......
......@@ -54,6 +54,7 @@ union snd_firewire_event {
#define SNDRV_FIREWIRE_TYPE_DICE 1
#define SNDRV_FIREWIRE_TYPE_FIREWORKS 2
#define SNDRV_FIREWIRE_TYPE_BEBOB 3
/* AV/C, RME, MOTU, ... */
struct snd_firewire_get_info {
......
......@@ -84,6 +84,7 @@ config SND_BEBOB
select SND_FIREWIRE_LIB
select SND_RAWMIDI
select SND_PCM
select SND_HWDEP
help
Say Y here to include support for FireWire devices based
on BridgeCo DM1000/DM1100/DM1500 with BeBoB firmware:
......
snd-bebob-objs := bebob_command.o bebob_stream.o bebob_proc.o bebob_midi.o \
bebob_pcm.o \
bebob_pcm.o bebob_hwdep.o \
bebob.o
obj-m += snd-bebob.o
......@@ -153,6 +153,7 @@ bebob_probe(struct fw_unit *unit,
bebob->unit = unit;
mutex_init(&bebob->mutex);
spin_lock_init(&bebob->lock);
init_waitqueue_head(&bebob->hwdep_wait);
err = name_device(bebob, entry->vendor_id);
if (err < 0)
......@@ -175,6 +176,10 @@ bebob_probe(struct fw_unit *unit,
if (err < 0)
goto error;
err = snd_bebob_create_hwdep_device(bebob);
if (err < 0)
goto error;
err = snd_bebob_stream_init_duplex(bebob);
if (err < 0)
goto error;
......
......@@ -24,6 +24,8 @@
#include <sound/rawmidi.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/firewire.h>
#include <sound/hwdep.h>
#include "../lib.h"
#include "../fcp.h"
......@@ -75,6 +77,11 @@ struct snd_bebob {
rx_stream_formations[SND_BEBOB_STRM_FMT_ENTRIES];
int sync_input_plug;
/* for uapi */
int dev_lock_count;
bool dev_lock_changed;
wait_queue_head_t hwdep_wait;
};
static inline int
......@@ -175,12 +182,18 @@ void snd_bebob_stream_stop_duplex(struct snd_bebob *bebob);
void snd_bebob_stream_update_duplex(struct snd_bebob *bebob);
void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob);
void snd_bebob_stream_lock_changed(struct snd_bebob *bebob);
int snd_bebob_stream_lock_try(struct snd_bebob *bebob);
void snd_bebob_stream_lock_release(struct snd_bebob *bebob);
void snd_bebob_proc_init(struct snd_bebob *bebob);
int snd_bebob_create_midi_devices(struct snd_bebob *bebob);
int snd_bebob_create_pcm_devices(struct snd_bebob *bebob);
int snd_bebob_create_hwdep_device(struct snd_bebob *bebob);
#define SND_BEBOB_DEV_ENTRY(vendor, model) \
{ \
.match_flags = IEEE1394_MATCH_VENDOR_ID | \
......
/*
* bebob_hwdep.c - a part of driver for BeBoB based devices
*
* Copyright (c) 2013-2014 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
/*
* This codes give three functionality.
*
* 1.get firewire node infomation
* 2.get notification about starting/stopping stream
* 3.lock/unlock stream
*/
#include "bebob.h"
static long
hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
loff_t *offset)
{
struct snd_bebob *bebob = hwdep->private_data;
DEFINE_WAIT(wait);
union snd_firewire_event event;
spin_lock_irq(&bebob->lock);
while (!bebob->dev_lock_changed) {
prepare_to_wait(&bebob->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
spin_unlock_irq(&bebob->lock);
schedule();
finish_wait(&bebob->hwdep_wait, &wait);
if (signal_pending(current))
return -ERESTARTSYS;
spin_lock_irq(&bebob->lock);
}
memset(&event, 0, sizeof(event));
if (bebob->dev_lock_changed) {
event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
event.lock_status.status = (bebob->dev_lock_count > 0);
bebob->dev_lock_changed = false;
count = min_t(long, count, sizeof(event.lock_status));
}
spin_unlock_irq(&bebob->lock);
if (copy_to_user(buf, &event, count))
return -EFAULT;
return count;
}
static unsigned int
hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait)
{
struct snd_bebob *bebob = hwdep->private_data;
unsigned int events;
poll_wait(file, &bebob->hwdep_wait, wait);
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_changed)
events = POLLIN | POLLRDNORM;
else
events = 0;
spin_unlock_irq(&bebob->lock);
return events;
}
static int
hwdep_get_info(struct snd_bebob *bebob, void __user *arg)
{
struct fw_device *dev = fw_parent_device(bebob->unit);
struct snd_firewire_get_info info;
memset(&info, 0, sizeof(info));
info.type = SNDRV_FIREWIRE_TYPE_BEBOB;
info.card = dev->card->index;
*(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
*(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
strlcpy(info.device_name, dev_name(&dev->device),
sizeof(info.device_name));
if (copy_to_user(arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int
hwdep_lock(struct snd_bebob *bebob)
{
int err;
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_count == 0) {
bebob->dev_lock_count = -1;
err = 0;
} else {
err = -EBUSY;
}
spin_unlock_irq(&bebob->lock);
return err;
}
static int
hwdep_unlock(struct snd_bebob *bebob)
{
int err;
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_count == -1) {
bebob->dev_lock_count = 0;
err = 0;
} else {
err = -EBADFD;
}
spin_unlock_irq(&bebob->lock);
return err;
}
static int
hwdep_release(struct snd_hwdep *hwdep, struct file *file)
{
struct snd_bebob *bebob = hwdep->private_data;
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_count == -1)
bebob->dev_lock_count = 0;
spin_unlock_irq(&bebob->lock);
return 0;
}
static int
hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct snd_bebob *bebob = hwdep->private_data;
switch (cmd) {
case SNDRV_FIREWIRE_IOCTL_GET_INFO:
return hwdep_get_info(bebob, (void __user *)arg);
case SNDRV_FIREWIRE_IOCTL_LOCK:
return hwdep_lock(bebob);
case SNDRV_FIREWIRE_IOCTL_UNLOCK:
return hwdep_unlock(bebob);
default:
return -ENOIOCTLCMD;
}
}
#ifdef CONFIG_COMPAT
static int
hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
unsigned int cmd, unsigned long arg)
{
return hwdep_ioctl(hwdep, file, cmd,
(unsigned long)compat_ptr(arg));
}
#else
#define hwdep_compat_ioctl NULL
#endif
static const struct snd_hwdep_ops hwdep_ops = {
.read = hwdep_read,
.release = hwdep_release,
.poll = hwdep_poll,
.ioctl = hwdep_ioctl,
.ioctl_compat = hwdep_compat_ioctl,
};
int snd_bebob_create_hwdep_device(struct snd_bebob *bebob)
{
struct snd_hwdep *hwdep;
int err;
err = snd_hwdep_new(bebob->card, "BeBoB", 0, &hwdep);
if (err < 0)
goto end;
strcpy(hwdep->name, "BeBoB");
hwdep->iface = SNDRV_HWDEP_IFACE_FW_BEBOB;
hwdep->ops = hwdep_ops;
hwdep->private_data = bebob;
hwdep->exclusive = true;
end:
return err;
}
......@@ -11,17 +11,35 @@
static int midi_capture_open(struct snd_rawmidi_substream *substream)
{
struct snd_bebob *bebob = substream->rmidi->private_data;
int err;
err = snd_bebob_stream_lock_try(bebob);
if (err < 0)
goto end;
atomic_inc(&bebob->capture_substreams);
return snd_bebob_stream_start_duplex(bebob, 0);
err = snd_bebob_stream_start_duplex(bebob, 0);
if (err < 0)
snd_bebob_stream_lock_release(bebob);
end:
return err;
}
static int midi_playback_open(struct snd_rawmidi_substream *substream)
{
struct snd_bebob *bebob = substream->rmidi->private_data;
int err;
err = snd_bebob_stream_lock_try(bebob);
if (err < 0)
goto end;
atomic_inc(&bebob->playback_substreams);
return snd_bebob_stream_start_duplex(bebob, 0);
err = snd_bebob_stream_start_duplex(bebob, 0);
if (err < 0)
snd_bebob_stream_lock_release(bebob);
end:
return err;
}
static int midi_capture_close(struct snd_rawmidi_substream *substream)
......@@ -31,6 +49,7 @@ static int midi_capture_close(struct snd_rawmidi_substream *substream)
atomic_dec(&bebob->capture_substreams);
snd_bebob_stream_stop_duplex(bebob);
snd_bebob_stream_lock_release(bebob);
return 0;
}
......@@ -41,6 +60,7 @@ static int midi_playback_close(struct snd_rawmidi_substream *substream)
atomic_dec(&bebob->playback_substreams);
snd_bebob_stream_stop_duplex(bebob);
snd_bebob_stream_lock_release(bebob);
return 0;
}
......
......@@ -159,13 +159,17 @@ pcm_open(struct snd_pcm_substream *substream)
bool internal;
int err;
err = pcm_init_hw_params(bebob, substream);
err = snd_bebob_stream_lock_try(bebob);
if (err < 0)
goto end;
err = pcm_init_hw_params(bebob, substream);
if (err < 0)
goto err_locked;
err = snd_bebob_stream_check_internal_clock(bebob, &internal);
if (err < 0)
goto end;
goto err_locked;
/*
* When source of clock is internal or any PCM stream are running,
......@@ -178,7 +182,7 @@ pcm_open(struct snd_pcm_substream *substream)
if (err < 0) {
dev_err(&bebob->unit->device,
"fail to get sampling rate: %d\n", err);
goto end;
goto err_locked;
}
substream->runtime->hw.rate_min = sampling_rate;
......@@ -186,14 +190,18 @@ pcm_open(struct snd_pcm_substream *substream)
}
snd_pcm_set_sync(substream);
end:
return err;
err_locked:
snd_bebob_stream_lock_release(bebob);
return err;
}
static int
pcm_close(struct snd_pcm_substream *substream)
{
struct snd_bebob *bebob = substream->private_data;
snd_bebob_stream_lock_release(bebob);
return 0;
}
......
......@@ -912,3 +912,42 @@ int snd_bebob_stream_discover(struct snd_bebob *bebob)
end:
return err;
}
void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
{
bebob->dev_lock_changed = true;
wake_up(&bebob->hwdep_wait);
}
int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
{
int err;
spin_lock_irq(&bebob->lock);
/* user land lock this */
if (bebob->dev_lock_count < 0) {
err = -EBUSY;
goto end;
}
/* this is the first time */
if (bebob->dev_lock_count++ == 0)
snd_bebob_stream_lock_changed(bebob);
err = 0;
end:
spin_unlock_irq(&bebob->lock);
return err;
}
void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
{
spin_lock_irq(&bebob->lock);
if (WARN_ON(bebob->dev_lock_count <= 0))
goto end;
if (--bebob->dev_lock_count == 0)
snd_bebob_stream_lock_changed(bebob);
end:
spin_unlock_irq(&bebob->lock);
}
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