Commit 71c37977 authored by Takashi Sakamoto's avatar Takashi Sakamoto Committed by Takashi Iwai
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ALSA: firewire-motu: add hwdep interface



This commit adds hwdep interface so as the other sound drivers for units
on IEEE 1394 bus have.

This interface is designed for mixer/control applications. By using this
interface, an 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 9e796e7d
......@@ -107,9 +107,10 @@ enum {
SNDRV_HWDEP_IFACE_FW_DIGI00X, /* Digidesign Digi 002/003 family */
SNDRV_HWDEP_IFACE_FW_TASCAM, /* TASCAM FireWire series */
SNDRV_HWDEP_IFACE_LINE6, /* Line6 USB processors */
SNDRV_HWDEP_IFACE_FW_MOTU, /* MOTU FireWire series */
/* Don't forget to change the following: */
SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_LINE6
SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_MOTU
};
struct snd_hwdep_info {
......
......@@ -65,7 +65,8 @@ union snd_firewire_event {
#define SNDRV_FIREWIRE_TYPE_OXFW 4
#define SNDRV_FIREWIRE_TYPE_DIGI00X 5
#define SNDRV_FIREWIRE_TYPE_TASCAM 6
/* RME, MOTU, ... */
#define SNDRV_FIREWIRE_TYPE_MOTU 7
/* RME... */
struct snd_firewire_get_info {
unsigned int type; /* SNDRV_FIREWIRE_TYPE_xxx */
......
snd-firewire-motu-objs := motu.o amdtp-motu.o motu-transaction.o motu-stream.o \
motu-proc.o motu-pcm.o motu-midi.o
motu-proc.o motu-pcm.o motu-midi.o motu-hwdep.o
obj-$(CONFIG_SND_FIREWIRE_MOTU) += snd-firewire-motu.o
/*
* motu-hwdep.c - a part of driver for MOTU FireWire series
*
* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
/*
* This codes have five functionalities.
*
* 1.get information about firewire node
* 2.get notification about starting/stopping stream
* 3.lock/unlock streaming
*
*/
#include "motu.h"
static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
loff_t *offset)
{
struct snd_motu *motu = hwdep->private_data;
DEFINE_WAIT(wait);
union snd_firewire_event event;
spin_lock_irq(&motu->lock);
while (!motu->dev_lock_changed) {
prepare_to_wait(&motu->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
spin_unlock_irq(&motu->lock);
schedule();
finish_wait(&motu->hwdep_wait, &wait);
if (signal_pending(current))
return -ERESTARTSYS;
spin_lock_irq(&motu->lock);
}
memset(&event, 0, sizeof(event));
if (motu->dev_lock_changed) {
event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
event.lock_status.status = (motu->dev_lock_count > 0);
motu->dev_lock_changed = false;
count = min_t(long, count, sizeof(event.lock_status));
}
spin_unlock_irq(&motu->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_motu *motu = hwdep->private_data;
unsigned int events;
poll_wait(file, &motu->hwdep_wait, wait);
spin_lock_irq(&motu->lock);
if (motu->dev_lock_changed)
events = POLLIN | POLLRDNORM;
else
events = 0;
spin_unlock_irq(&motu->lock);
return events | POLLOUT;
}
static int hwdep_get_info(struct snd_motu *motu, void __user *arg)
{
struct fw_device *dev = fw_parent_device(motu->unit);
struct snd_firewire_get_info info;
memset(&info, 0, sizeof(info));
info.type = SNDRV_FIREWIRE_TYPE_MOTU;
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_motu *motu)
{
int err;
spin_lock_irq(&motu->lock);
if (motu->dev_lock_count == 0) {
motu->dev_lock_count = -1;
err = 0;
} else {
err = -EBUSY;
}
spin_unlock_irq(&motu->lock);
return err;
}
static int hwdep_unlock(struct snd_motu *motu)
{
int err;
spin_lock_irq(&motu->lock);
if (motu->dev_lock_count == -1) {
motu->dev_lock_count = 0;
err = 0;
} else {
err = -EBADFD;
}
spin_unlock_irq(&motu->lock);
return err;
}
static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
{
struct snd_motu *motu = hwdep->private_data;
spin_lock_irq(&motu->lock);
if (motu->dev_lock_count == -1)
motu->dev_lock_count = 0;
spin_unlock_irq(&motu->lock);
return 0;
}
static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct snd_motu *motu = hwdep->private_data;
switch (cmd) {
case SNDRV_FIREWIRE_IOCTL_GET_INFO:
return hwdep_get_info(motu, (void __user *)arg);
case SNDRV_FIREWIRE_IOCTL_LOCK:
return hwdep_lock(motu);
case SNDRV_FIREWIRE_IOCTL_UNLOCK:
return hwdep_unlock(motu);
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
int snd_motu_create_hwdep_device(struct snd_motu *motu)
{
static const struct snd_hwdep_ops ops = {
.read = hwdep_read,
.release = hwdep_release,
.poll = hwdep_poll,
.ioctl = hwdep_ioctl,
.ioctl_compat = hwdep_compat_ioctl,
};
struct snd_hwdep *hwdep;
int err;
err = snd_hwdep_new(motu->card, motu->card->driver, 0, &hwdep);
if (err < 0)
return err;
strcpy(hwdep->name, "MOTU");
hwdep->iface = SNDRV_HWDEP_IFACE_FW_MOTU;
hwdep->ops = ops;
hwdep->private_data = motu;
hwdep->exclusive = true;
return 0;
}
......@@ -12,6 +12,10 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream)
struct snd_motu *motu = substream->rmidi->private_data;
int err;
err = snd_motu_stream_lock_try(motu);
if (err < 0)
return err;
mutex_lock(&motu->mutex);
motu->capture_substreams++;
......@@ -19,6 +23,9 @@ static int midi_capture_open(struct snd_rawmidi_substream *substream)
mutex_unlock(&motu->mutex);
if (err < 0)
snd_motu_stream_lock_release(motu);
return err;
}
......@@ -27,6 +34,10 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream)
struct snd_motu *motu = substream->rmidi->private_data;
int err;
err = snd_motu_stream_lock_try(motu);
if (err < 0)
return err;
mutex_lock(&motu->mutex);
motu->playback_substreams++;
......@@ -34,6 +45,9 @@ static int midi_playback_open(struct snd_rawmidi_substream *substream)
mutex_unlock(&motu->mutex);
if (err < 0)
snd_motu_stream_lock_release(motu);
return err;
}
......@@ -48,6 +62,7 @@ static int midi_capture_close(struct snd_rawmidi_substream *substream)
mutex_unlock(&motu->mutex);
snd_motu_stream_lock_release(motu);
return 0;
}
......@@ -62,6 +77,7 @@ static int midi_playback_close(struct snd_rawmidi_substream *substream)
mutex_unlock(&motu->mutex);
snd_motu_stream_lock_release(motu);
return 0;
}
......
......@@ -159,15 +159,19 @@ static int pcm_open(struct snd_pcm_substream *substream)
unsigned int rate;
int err;
err = snd_motu_stream_lock_try(motu);
if (err < 0)
return err;
mutex_lock(&motu->mutex);
err = protocol->cache_packet_formats(motu);
if (err < 0)
return err;
goto err_locked;
err = init_hw_info(motu, substream);
if (err < 0)
return err;
goto err_locked;
/*
* When source of clock is not internal or any PCM streams are running,
......@@ -175,13 +179,13 @@ static int pcm_open(struct snd_pcm_substream *substream)
*/
err = protocol->get_clock_source(motu, &src);
if (err < 0)
return err;
goto err_locked;
if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL ||
amdtp_stream_pcm_running(&motu->tx_stream) ||
amdtp_stream_pcm_running(&motu->rx_stream)) {
err = protocol->get_clock_rate(motu, &rate);
if (err < 0)
return err;
goto err_locked;
substream->runtime->hw.rate_min = rate;
substream->runtime->hw.rate_max = rate;
}
......@@ -190,11 +194,19 @@ static int pcm_open(struct snd_pcm_substream *substream)
mutex_unlock(&motu->mutex);
return err;
err_locked:
mutex_unlock(&motu->mutex);
snd_motu_stream_lock_release(motu);
return err;
}
static int pcm_close(struct snd_pcm_substream *substream)
{
struct snd_motu *motu = substream->private_data;
snd_motu_stream_lock_release(motu);
return 0;
}
......
......@@ -341,3 +341,41 @@ void snd_motu_stream_destroy_duplex(struct snd_motu *motu)
motu->playback_substreams = 0;
motu->capture_substreams = 0;
}
static void motu_lock_changed(struct snd_motu *motu)
{
motu->dev_lock_changed = true;
wake_up(&motu->hwdep_wait);
}
int snd_motu_stream_lock_try(struct snd_motu *motu)
{
int err;
spin_lock_irq(&motu->lock);
if (motu->dev_lock_count < 0) {
err = -EBUSY;
goto out;
}
if (motu->dev_lock_count++ == 0)
motu_lock_changed(motu);
err = 0;
out:
spin_unlock_irq(&motu->lock);
return err;
}
void snd_motu_stream_lock_release(struct snd_motu *motu)
{
spin_lock_irq(&motu->lock);
if (WARN_ON(motu->dev_lock_count <= 0))
goto out;
if (--motu->dev_lock_count == 0)
motu_lock_changed(motu);
out:
spin_unlock_irq(&motu->lock);
}
......@@ -109,6 +109,10 @@ static void do_registration(struct work_struct *work)
goto error;
}
err = snd_motu_create_hwdep_device(motu);
if (err < 0)
goto error;
err = snd_card_register(motu->card);
if (err < 0)
goto error;
......@@ -145,6 +149,7 @@ static int motu_probe(struct fw_unit *unit,
mutex_init(&motu->mutex);
spin_lock_init(&motu->lock);
init_waitqueue_head(&motu->hwdep_wait);
/* Allocate and register this sound card later. */
INIT_DEFERRABLE_WORK(&motu->dwork, do_registration);
......
......@@ -16,12 +16,16 @@
#include <linux/mod_devicetable.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/compat.h>
#include <linux/sched/signal.h>
#include <sound/control.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/info.h>
#include <sound/rawmidi.h>
#include <sound/firewire.h>
#include <sound/hwdep.h>
#include "../lib.h"
#include "../amdtp-stream.h"
......@@ -62,6 +66,11 @@ struct snd_motu {
/* For notification. */
struct fw_address_handler async_handler;
u32 msg;
/* For uapi */
int dev_lock_count;
bool dev_lock_changed;
wait_queue_head_t hwdep_wait;
};
enum snd_motu_spec_flags {
......@@ -136,10 +145,14 @@ int snd_motu_stream_init_duplex(struct snd_motu *motu);
void snd_motu_stream_destroy_duplex(struct snd_motu *motu);
int snd_motu_stream_start_duplex(struct snd_motu *motu, unsigned int rate);
void snd_motu_stream_stop_duplex(struct snd_motu *motu);
int snd_motu_stream_lock_try(struct snd_motu *motu);
void snd_motu_stream_lock_release(struct snd_motu *motu);
void snd_motu_proc_init(struct snd_motu *motu);
int snd_motu_create_pcm_devices(struct snd_motu *motu);
int snd_motu_create_midi_devices(struct snd_motu *motu);
int snd_motu_create_hwdep_device(struct snd_motu *motu);
#endif
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