[linux-2.6-block.git] / sound / firewire / digi00x / digi00x-hwdep.c

/*
 * digi00x-hwdep.c - a part of driver for Digidesign Digi 002/003 family
 *
 * Copyright (c) 2014-2015 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
 * 4.get asynchronous messaging
 */

#include "digi00x.h"

static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf,  long count,
		       loff_t *offset)
{
	struct snd_dg00x *dg00x = hwdep->private_data;
	DEFINE_WAIT(wait);
	union snd_firewire_event event;

	spin_lock_irq(&dg00x->lock);

	while (!dg00x->dev_lock_changed && dg00x->msg == 0) {
		prepare_to_wait(&dg00x->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
		spin_unlock_irq(&dg00x->lock);
		schedule();
		finish_wait(&dg00x->hwdep_wait, &wait);
		if (signal_pending(current))
			return -ERESTARTSYS;
		spin_lock_irq(&dg00x->lock);
	}

	memset(&event, 0, sizeof(event));
	if (dg00x->dev_lock_changed) {
		event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
		event.lock_status.status = (dg00x->dev_lock_count > 0);
		dg00x->dev_lock_changed = false;

		count = min_t(long, count, sizeof(event.lock_status));
	} else {
		event.digi00x_message.type =
					SNDRV_FIREWIRE_EVENT_DIGI00X_MESSAGE;
		event.digi00x_message.message = dg00x->msg;
		dg00x->msg = 0;

		count = min_t(long, count, sizeof(event.digi00x_message));
	}

	spin_unlock_irq(&dg00x->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_dg00x *dg00x = hwdep->private_data;
	__poll_t events;

	poll_wait(file, &dg00x->hwdep_wait, wait);

	spin_lock_irq(&dg00x->lock);
	if (dg00x->dev_lock_changed || dg00x->msg)
		events = EPOLLIN | EPOLLRDNORM;
	else
		events = 0;
	spin_unlock_irq(&dg00x->lock);

	return events;
}

static int hwdep_get_info(struct snd_dg00x *dg00x, void __user *arg)
{
	struct fw_device *dev = fw_parent_device(dg00x->unit);
	struct snd_firewire_get_info info;

	memset(&info, 0, sizeof(info));
	info.type = SNDRV_FIREWIRE_TYPE_DIGI00X;
	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_dg00x *dg00x)
{
	int err;

	spin_lock_irq(&dg00x->lock);

	if (dg00x->dev_lock_count == 0) {
		dg00x->dev_lock_count = -1;
		err = 0;
	} else {
		err = -EBUSY;
	}

	spin_unlock_irq(&dg00x->lock);

	return err;
}

static int hwdep_unlock(struct snd_dg00x *dg00x)
{
	int err;

	spin_lock_irq(&dg00x->lock);

	if (dg00x->dev_lock_count == -1) {
		dg00x->dev_lock_count = 0;
		err = 0;
	} else {
		err = -EBADFD;
	}

	spin_unlock_irq(&dg00x->lock);

	return err;
}

static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
{
	struct snd_dg00x *dg00x = hwdep->private_data;

	spin_lock_irq(&dg00x->lock);
	if (dg00x->dev_lock_count == -1)
		dg00x->dev_lock_count = 0;
	spin_unlock_irq(&dg00x->lock);

	return 0;
}

static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
	    unsigned int cmd, unsigned long arg)
{
	struct snd_dg00x *dg00x = hwdep->private_data;

	switch (cmd) {
	case SNDRV_FIREWIRE_IOCTL_GET_INFO:
		return hwdep_get_info(dg00x, (void __user *)arg);
	case SNDRV_FIREWIRE_IOCTL_LOCK:
		return hwdep_lock(dg00x);
	case SNDRV_FIREWIRE_IOCTL_UNLOCK:
		return hwdep_unlock(dg00x);
	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_dg00x_create_hwdep_device(struct snd_dg00x *dg00x)
{
	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(dg00x->card, "Digi00x", 0, &hwdep);
	if (err < 0)
		return err;

	strcpy(hwdep->name, "Digi00x");
	hwdep->iface = SNDRV_HWDEP_IFACE_FW_DIGI00X;
	hwdep->ops = ops;
	hwdep->private_data = dg00x;
	hwdep->exclusive = true;

	return err;
}
Commit	Line	Data
660dd3d5 TS	1	/*
	2	* digi00x-hwdep.c - a part of driver for Digidesign Digi 002/003 family
	3	*
	4	* Copyright (c) 2014-2015 Takashi Sakamoto
	5	*
	6	* Licensed under the terms of the GNU General Public License, version 2.
	7	*/
	8
	9	/*
	10	* This codes give three functionality.
	11	*
	12	* 1.get firewire node information
	13	* 2.get notification about starting/stopping stream
	14	* 3.lock/unlock stream
44b73088	15	* 4.get asynchronous messaging
660dd3d5 TS	16	*/
	17
	18	#include "digi00x.h"
	19
	20	static long hwdep_read(struct snd_hwdep hwdep, char __user buf, long count,
	21	loff_t *offset)
	22	{
	23	struct snd_dg00x *dg00x = hwdep->private_data;
	24	DEFINE_WAIT(wait);
	25	union snd_firewire_event event;
	26
	27	spin_lock_irq(&dg00x->lock);
	28
44b73088	29	while (!dg00x->dev_lock_changed && dg00x->msg == 0) {
660dd3d5 TS	30	prepare_to_wait(&dg00x->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
	31	spin_unlock_irq(&dg00x->lock);
	32	schedule();
	33	finish_wait(&dg00x->hwdep_wait, &wait);
	34	if (signal_pending(current))
	35	return -ERESTARTSYS;
	36	spin_lock_irq(&dg00x->lock);
	37	}
	38
	39	memset(&event, 0, sizeof(event));
	40	if (dg00x->dev_lock_changed) {
	41	event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
	42	event.lock_status.status = (dg00x->dev_lock_count > 0);
	43	dg00x->dev_lock_changed = false;
	44
	45	count = min_t(long, count, sizeof(event.lock_status));
44b73088 TS	46	} else {
	47	event.digi00x_message.type =
	48	SNDRV_FIREWIRE_EVENT_DIGI00X_MESSAGE;
	49	event.digi00x_message.message = dg00x->msg;
	50	dg00x->msg = 0;
	51
	52	count = min_t(long, count, sizeof(event.digi00x_message));
660dd3d5 TS	53	}
	54
	55	spin_unlock_irq(&dg00x->lock);
	56
	57	if (copy_to_user(buf, &event, count))
	58	return -EFAULT;
	59
	60	return count;
	61	}
	62
680ef72a	63	static __poll_t hwdep_poll(struct snd_hwdep hwdep, struct file file,
660dd3d5 TS	64	poll_table *wait)
	65	{
	66	struct snd_dg00x *dg00x = hwdep->private_data;
680ef72a	67	__poll_t events;
660dd3d5 TS	68
	69	poll_wait(file, &dg00x->hwdep_wait, wait);
	70
	71	spin_lock_irq(&dg00x->lock);
44b73088	72	if (dg00x->dev_lock_changed \|\| dg00x->msg)
a9a08845	73	events = EPOLLIN \| EPOLLRDNORM;
660dd3d5 TS	74	else
	75	events = 0;
	76	spin_unlock_irq(&dg00x->lock);
	77
	78	return events;
	79	}
	80
	81	static int hwdep_get_info(struct snd_dg00x dg00x, void __user arg)
	82	{
	83	struct fw_device *dev = fw_parent_device(dg00x->unit);
	84	struct snd_firewire_get_info info;
	85
	86	memset(&info, 0, sizeof(info));
	87	info.type = SNDRV_FIREWIRE_TYPE_DIGI00X;
	88	info.card = dev->card->index;
	89	(__be32 )&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
	90	(__be32 )&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
	91	strlcpy(info.device_name, dev_name(&dev->device),
	92	sizeof(info.device_name));
	93
	94	if (copy_to_user(arg, &info, sizeof(info)))
	95	return -EFAULT;
	96
	97	return 0;
	98	}
	99
	100	static int hwdep_lock(struct snd_dg00x *dg00x)
	101	{
	102	int err;
	103
	104	spin_lock_irq(&dg00x->lock);
	105
	106	if (dg00x->dev_lock_count == 0) {
	107	dg00x->dev_lock_count = -1;
	108	err = 0;
	109	} else {
	110	err = -EBUSY;
	111	}
	112
	113	spin_unlock_irq(&dg00x->lock);
	114
	115	return err;
	116	}
	117
	118	static int hwdep_unlock(struct snd_dg00x *dg00x)
	119	{
	120	int err;
	121
	122	spin_lock_irq(&dg00x->lock);
	123
	124	if (dg00x->dev_lock_count == -1) {
	125	dg00x->dev_lock_count = 0;
	126	err = 0;
	127	} else {
	128	err = -EBADFD;
	129	}
	130
	131	spin_unlock_irq(&dg00x->lock);
	132
	133	return err;
	134	}
	135
	136	static int hwdep_release(struct snd_hwdep hwdep, struct file file)
	137	{
138	struct snd_dg00x *dg00x = hwdep->private_data;
139
140	spin_lock_irq(&dg00x->lock);
141	if (dg00x->dev_lock_count == -1)
142	dg00x->dev_lock_count = 0;
143	spin_unlock_irq(&dg00x->lock);
144
145	return 0;
146	}
147
148	static int hwdep_ioctl(struct snd_hwdep hwdep, struct file file,
149	unsigned int cmd, unsigned long arg)
150	{
151	struct snd_dg00x *dg00x = hwdep->private_data;
152
153	switch (cmd) {
154	case SNDRV_FIREWIRE_IOCTL_GET_INFO:
155	return hwdep_get_info(dg00x, (void __user *)arg);
156	case SNDRV_FIREWIRE_IOCTL_LOCK:
157	return hwdep_lock(dg00x);
158	case SNDRV_FIREWIRE_IOCTL_UNLOCK:
159	return hwdep_unlock(dg00x);
160	default:
161	return -ENOIOCTLCMD;
162	}
163	}
164
165	#ifdef CONFIG_COMPAT
166	static int hwdep_compat_ioctl(struct snd_hwdep hwdep, struct file file,
167	unsigned int cmd, unsigned long arg)
168	{
169	return hwdep_ioctl(hwdep, file, cmd,
170	(unsigned long)compat_ptr(arg));
171	}
172	#else
173	#define hwdep_compat_ioctl NULL
174	#endif
175
660dd3d5 TS	176	int snd_dg00x_create_hwdep_device(struct snd_dg00x *dg00x)
660dd3d5 TS	177	{
a4e86cba TS	178	static const struct snd_hwdep_ops ops = {
	179	.read = hwdep_read,
	180	.release = hwdep_release,
	181	.poll = hwdep_poll,
	182	.ioctl = hwdep_ioctl,
	183	.ioctl_compat = hwdep_compat_ioctl,
	184	};
660dd3d5 TS	185	struct snd_hwdep *hwdep;
	186	int err;
	187
	188	err = snd_hwdep_new(dg00x->card, "Digi00x", 0, &hwdep);
	189	if (err < 0)
	190	return err;
	191
	192	strcpy(hwdep->name, "Digi00x");
	193	hwdep->iface = SNDRV_HWDEP_IFACE_FW_DIGI00X;
a4e86cba	194	hwdep->ops = ops;
660dd3d5 TS	195	hwdep->private_data = dg00x;
	196	hwdep->exclusive = true;
	197
	198	return err;
	199	}