[linux-2.6-block.git] / sound / firewire / motu / motu-hwdep.c

/*
 * 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 && motu->msg == 0) {
		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));
	} else {
		event.motu_notification.type = SNDRV_FIREWIRE_EVENT_MOTU_NOTIFICATION;
		event.motu_notification.message = motu->msg;
		motu->msg = 0;

		count = min_t(long, count, sizeof(event.motu_notification));
	}

	spin_unlock_irq(&motu->lock);

	if (copy_to_user(buf, &event, count))
		return -EFAULT;

	return count;
}

static __poll_t hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
			       poll_table *wait)
{
	struct snd_motu *motu = hwdep->private_data;
	__poll_t events;

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

	spin_lock_irq(&motu->lock);
	if (motu->dev_lock_changed || motu->msg)
		events = EPOLLIN | EPOLLRDNORM;
	else
		events = 0;
	spin_unlock_irq(&motu->lock);

	return events | EPOLLOUT;
}

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;
}
Commit	Line	Data
71c37977 TS	1	/*
	2	* motu-hwdep.c - a part of driver for MOTU FireWire series
	3	*
	4	* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
	5	*
	6	* Licensed under the terms of the GNU General Public License, version 2.
	7	*/
	8
	9	/*
	10	* This codes have five functionalities.
	11	*
	12	* 1.get information about firewire node
	13	* 2.get notification about starting/stopping stream
	14	* 3.lock/unlock streaming
	15	*
	16	*/
	17
	18	#include "motu.h"
	19
	20	static long hwdep_read(struct snd_hwdep hwdep, char __user buf, long count,
	21	loff_t *offset)
	22	{
	23	struct snd_motu *motu = hwdep->private_data;
	24	DEFINE_WAIT(wait);
	25	union snd_firewire_event event;
	26
	27	spin_lock_irq(&motu->lock);
	28
5aaab1bf	29	while (!motu->dev_lock_changed && motu->msg == 0) {
71c37977 TS	30	prepare_to_wait(&motu->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
	31	spin_unlock_irq(&motu->lock);
	32	schedule();
	33	finish_wait(&motu->hwdep_wait, &wait);
	34	if (signal_pending(current))
	35	return -ERESTARTSYS;
	36	spin_lock_irq(&motu->lock);
	37	}
	38
	39	memset(&event, 0, sizeof(event));
	40	if (motu->dev_lock_changed) {
	41	event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
	42	event.lock_status.status = (motu->dev_lock_count > 0);
	43	motu->dev_lock_changed = false;
	44
	45	count = min_t(long, count, sizeof(event.lock_status));
5aaab1bf TS	46	} else {
	47	event.motu_notification.type = SNDRV_FIREWIRE_EVENT_MOTU_NOTIFICATION;
	48	event.motu_notification.message = motu->msg;
	49	motu->msg = 0;
	50
	51	count = min_t(long, count, sizeof(event.motu_notification));
71c37977 TS	52	}
	53
	54	spin_unlock_irq(&motu->lock);
	55
	56	if (copy_to_user(buf, &event, count))
	57	return -EFAULT;
	58
	59	return count;
	60	}
	61
680ef72a	62	static __poll_t hwdep_poll(struct snd_hwdep hwdep, struct file file,
71c37977 TS	63	poll_table *wait)
	64	{
	65	struct snd_motu *motu = hwdep->private_data;
680ef72a	66	__poll_t events;
71c37977 TS	67
	68	poll_wait(file, &motu->hwdep_wait, wait);
	69
	70	spin_lock_irq(&motu->lock);
5aaab1bf	71	if (motu->dev_lock_changed \|\| motu->msg)
a9a08845	72	events = EPOLLIN \| EPOLLRDNORM;
71c37977 TS	73	else
	74	events = 0;
	75	spin_unlock_irq(&motu->lock);
	76
a9a08845	77	return events \| EPOLLOUT;
71c37977 TS	78	}
	79
	80	static int hwdep_get_info(struct snd_motu motu, void __user arg)
	81	{
	82	struct fw_device *dev = fw_parent_device(motu->unit);
	83	struct snd_firewire_get_info info;
	84
	85	memset(&info, 0, sizeof(info));
	86	info.type = SNDRV_FIREWIRE_TYPE_MOTU;
	87	info.card = dev->card->index;
	88	(__be32 )&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
	89	(__be32 )&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
	90	strlcpy(info.device_name, dev_name(&dev->device),
	91	sizeof(info.device_name));
	92
	93	if (copy_to_user(arg, &info, sizeof(info)))
	94	return -EFAULT;
	95
	96	return 0;
	97	}
	98
	99	static int hwdep_lock(struct snd_motu *motu)
	100	{
	101	int err;
	102
	103	spin_lock_irq(&motu->lock);
	104
	105	if (motu->dev_lock_count == 0) {
	106	motu->dev_lock_count = -1;
	107	err = 0;
	108	} else {
	109	err = -EBUSY;
	110	}
	111
	112	spin_unlock_irq(&motu->lock);
	113
	114	return err;
	115	}
	116
	117	static int hwdep_unlock(struct snd_motu *motu)
	118	{
	119	int err;
	120
	121	spin_lock_irq(&motu->lock);
	122
	123	if (motu->dev_lock_count == -1) {
	124	motu->dev_lock_count = 0;
	125	err = 0;
	126	} else {
	127	err = -EBADFD;
	128	}
	129
	130	spin_unlock_irq(&motu->lock);
	131
	132	return err;
	133	}
	134
	135	static int hwdep_release(struct snd_hwdep hwdep, struct file file)
	136	{
	137	struct snd_motu *motu = hwdep->private_data;
	138
	139	spin_lock_irq(&motu->lock);
	140	if (motu->dev_lock_count == -1)
	141	motu->dev_lock_count = 0;
142	spin_unlock_irq(&motu->lock);
143
144	return 0;
145	}
146
147	static int hwdep_ioctl(struct snd_hwdep hwdep, struct file file,
148	unsigned int cmd, unsigned long arg)
149	{
150	struct snd_motu *motu = hwdep->private_data;
151
152	switch (cmd) {
153	case SNDRV_FIREWIRE_IOCTL_GET_INFO:
154	return hwdep_get_info(motu, (void __user *)arg);
155	case SNDRV_FIREWIRE_IOCTL_LOCK:
156	return hwdep_lock(motu);
157	case SNDRV_FIREWIRE_IOCTL_UNLOCK:
158	return hwdep_unlock(motu);
159	default:
160	return -ENOIOCTLCMD;
161	}
162	}
163
164	#ifdef CONFIG_COMPAT
165	static int hwdep_compat_ioctl(struct snd_hwdep hwdep, struct file file,
166	unsigned int cmd, unsigned long arg)
167	{
168	return hwdep_ioctl(hwdep, file, cmd,
169	(unsigned long)compat_ptr(arg));
170	}
171	#else
172	#define hwdep_compat_ioctl NULL
173	#endif
174
175	int snd_motu_create_hwdep_device(struct snd_motu *motu)
176	{
177	static const struct snd_hwdep_ops ops = {
178	.read = hwdep_read,
179	.release = hwdep_release,
180	.poll = hwdep_poll,
181	.ioctl = hwdep_ioctl,
182	.ioctl_compat = hwdep_compat_ioctl,
183	};
184	struct snd_hwdep *hwdep;
185	int err;
186
187	err = snd_hwdep_new(motu->card, motu->card->driver, 0, &hwdep);
188	if (err < 0)
189	return err;
190
191	strcpy(hwdep->name, "MOTU");
192	hwdep->iface = SNDRV_HWDEP_IFACE_FW_MOTU;
193	hwdep->ops = ops;
194	hwdep->private_data = motu;
195	hwdep->exclusive = true;
196
197	return 0;
198	}