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Commit e5e0c3dd authored by Takashi Sakamoto's avatar Takashi Sakamoto Committed by Takashi Iwai
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ALSA: firewire-tascam: add hwdep interface 



This commit adds hwdep interface so as the other IEEE 1394 sound devices
has.

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 e453df44

include/uapi/sound/asound.h

+2 −1
Original line number Diff line number Diff line
@@ -101,9 +101,10 @@ enum { 
	SNDRV_HWDEP_IFACE_FW_BEBOB,	/* BridgeCo BeBoB based device */

	SNDRV_HWDEP_IFACE_FW_OXFW,	/* Oxford OXFW970/971 based device */

	SNDRV_HWDEP_IFACE_FW_DIGI00X,	/* Digidesign Digi 002/003 family */

	SNDRV_HWDEP_IFACE_FW_TASCAM,	/* TASCAM FireWire series */



	/* Don't forget to change the following: */

	SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_DIGI00X

	SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_TASCAM

};



struct snd_hwdep_info {

include/uapi/sound/firewire.h

+1 −0
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ union snd_firewire_event { 
#define SNDRV_FIREWIRE_TYPE_BEBOB	3

#define SNDRV_FIREWIRE_TYPE_OXFW	4

#define SNDRV_FIREWIRE_TYPE_DIGI00X	5

#define SNDRV_FIREWIRE_TYPE_TASCAM	6

/* RME, MOTU, ... */



struct snd_firewire_get_info {

sound/firewire/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -138,6 +138,7 @@ config SND_FIREWIRE_DIGI00X 
config SND_FIREWIRE_TASCAM

	tristate "TASCAM FireWire series support"

	select SND_FIREWIRE_LIB

	select SND_HWDEP

	help

	 Say Y here to include support for TASCAM.

	  * FW-1884

sound/firewire/tascam/Makefile

+1 −1
Original line number Diff line number Diff line 
snd-firewire-tascam-objs := tascam-proc.o amdtp-tascam.o tascam-stream.o \

			    tascam-pcm.o tascam.o

			    tascam-pcm.o tascam-hwdep.o tascam.o

obj-$(CONFIG_SND_FIREWIRE_TASCAM) += snd-firewire-tascam.o

sound/firewire/tascam/tascam-hwdep.c

0 → 100644
+201 −0
Original line number Diff line number Diff line 
/*

 * tascam-hwdep.c - a part of driver for TASCAM FireWire series

 *

 * Copyright (c) 2015 Takashi Sakamoto

 *

 * Licensed under the terms of the GNU General Public License, version 2.

 */



/*

 * This codes give three functionality.

 *

 * 1.get firewire node information

 * 2.get notification about starting/stopping stream

 * 3.lock/unlock stream

 */



#include "tascam.h"



static long hwdep_read_locked(struct snd_tscm *tscm, char __user *buf,

			      long count)

{

	union snd_firewire_event event;



	memset(&event, 0, sizeof(event));



	event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;

	event.lock_status.status = (tscm->dev_lock_count > 0);

	tscm->dev_lock_changed = false;



	count = min_t(long, count, sizeof(event.lock_status));



	if (copy_to_user(buf, &event, count))

		return -EFAULT;



	return count;

}



static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,

		       loff_t *offset)

{

	struct snd_tscm *tscm = hwdep->private_data;

	DEFINE_WAIT(wait);

	union snd_firewire_event event;



	spin_lock_irq(&tscm->lock);



	while (!tscm->dev_lock_changed) {

		prepare_to_wait(&tscm->hwdep_wait, &wait, TASK_INTERRUPTIBLE);

		spin_unlock_irq(&tscm->lock);

		schedule();

		finish_wait(&tscm->hwdep_wait, &wait);

		if (signal_pending(current))

			return -ERESTARTSYS;

		spin_lock_irq(&tscm->lock);

	}



	memset(&event, 0, sizeof(event));

	count = hwdep_read_locked(tscm, buf, count);

	spin_unlock_irq(&tscm->lock);



	return count;

}



static unsigned int hwdep_poll(struct snd_hwdep *hwdep, struct file *file,

			       poll_table *wait)

{

	struct snd_tscm *tscm = hwdep->private_data;

	unsigned int events;



	poll_wait(file, &tscm->hwdep_wait, wait);



	spin_lock_irq(&tscm->lock);

	if (tscm->dev_lock_changed)

		events = POLLIN | POLLRDNORM;

	else

		events = 0;

	spin_unlock_irq(&tscm->lock);



	return events;

}



static int hwdep_get_info(struct snd_tscm *tscm, void __user *arg)

{

	struct fw_device *dev = fw_parent_device(tscm->unit);

	struct snd_firewire_get_info info;



	memset(&info, 0, sizeof(info));

	info.type = SNDRV_FIREWIRE_TYPE_TASCAM;

	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_tscm *tscm)

{

	int err;



	spin_lock_irq(&tscm->lock);



	if (tscm->dev_lock_count == 0) {

		tscm->dev_lock_count = -1;

		err = 0;

	} else {

		err = -EBUSY;

	}



	spin_unlock_irq(&tscm->lock);



	return err;

}



static int hwdep_unlock(struct snd_tscm *tscm)

{

	int err;



	spin_lock_irq(&tscm->lock);



	if (tscm->dev_lock_count == -1) {

		tscm->dev_lock_count = 0;

		err = 0;

	} else {

		err = -EBADFD;

	}



	spin_unlock_irq(&tscm->lock);



	return err;

}



static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)

{

	struct snd_tscm *tscm = hwdep->private_data;



	spin_lock_irq(&tscm->lock);

	if (tscm->dev_lock_count == -1)

		tscm->dev_lock_count = 0;

	spin_unlock_irq(&tscm->lock);



	return 0;

}



static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,

	    unsigned int cmd, unsigned long arg)

{

	struct snd_tscm *tscm = hwdep->private_data;



	switch (cmd) {

	case SNDRV_FIREWIRE_IOCTL_GET_INFO:

		return hwdep_get_info(tscm, (void __user *)arg);

	case SNDRV_FIREWIRE_IOCTL_LOCK:

		return hwdep_lock(tscm);

	case SNDRV_FIREWIRE_IOCTL_UNLOCK:

		return hwdep_unlock(tscm);

	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_tscm_create_hwdep_device(struct snd_tscm *tscm)

{

	struct snd_hwdep *hwdep;

	int err;



	err = snd_hwdep_new(tscm->card, "Tascam", 0, &hwdep);

	if (err < 0)

		return err;



	strcpy(hwdep->name, "Tascam");

	hwdep->iface = SNDRV_HWDEP_IFACE_FW_TASCAM;

	hwdep->ops = hwdep_ops;

	hwdep->private_data = tscm;

	hwdep->exclusive = true;



	return err;

}