[linux-2.6-block.git] / sound / firewire / bebob / bebob_hwdep.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * bebob_hwdep.c - a part of driver for BeBoB based devices
 *
 * Copyright (c) 2013-2014 Takashi Sakamoto
 */

/*
 * 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 __poll_t
hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait)
{
	struct snd_bebob *bebob = hwdep->private_data;
	__poll_t events;

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

	spin_lock_irq(&bebob->lock);
	if (bebob->dev_lock_changed)
		events = EPOLLIN | EPOLLRDNORM;
	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

int snd_bebob_create_hwdep_device(struct snd_bebob *bebob)
{
	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(bebob->card, "BeBoB", 0, &hwdep);
	if (err < 0)
		goto end;
	strcpy(hwdep->name, "BeBoB");
	hwdep->iface = SNDRV_HWDEP_IFACE_FW_BEBOB;
	hwdep->ops = ops;
	hwdep->private_data = bebob;
	hwdep->exclusive = true;
end:
	return err;
}
Commit	Line	Data
da607e19	1	// SPDX-License-Identifier: GPL-2.0-only
618eabea TS	2	/*
	3	* bebob_hwdep.c - a part of driver for BeBoB based devices
	4	*
	5	* Copyright (c) 2013-2014 Takashi Sakamoto
618eabea TS	6	*/
	7
	8	/*
	9	* This codes give three functionality.
	10	*
	11	* 1.get firewire node infomation
	12	* 2.get notification about starting/stopping stream
	13	* 3.lock/unlock stream
	14	*/
	15
	16	#include "bebob.h"
	17
	18	static long
	19	hwdep_read(struct snd_hwdep hwdep, char __user buf, long count,
	20	loff_t *offset)
	21	{
	22	struct snd_bebob *bebob = hwdep->private_data;
	23	DEFINE_WAIT(wait);
	24	union snd_firewire_event event;
	25
	26	spin_lock_irq(&bebob->lock);
	27
	28	while (!bebob->dev_lock_changed) {
	29	prepare_to_wait(&bebob->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
	30	spin_unlock_irq(&bebob->lock);
	31	schedule();
	32	finish_wait(&bebob->hwdep_wait, &wait);
	33	if (signal_pending(current))
	34	return -ERESTARTSYS;
	35	spin_lock_irq(&bebob->lock);
	36	}
	37
	38	memset(&event, 0, sizeof(event));
	39	if (bebob->dev_lock_changed) {
	40	event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
	41	event.lock_status.status = (bebob->dev_lock_count > 0);
	42	bebob->dev_lock_changed = false;
	43
	44	count = min_t(long, count, sizeof(event.lock_status));
	45	}
	46
	47	spin_unlock_irq(&bebob->lock);
	48
	49	if (copy_to_user(buf, &event, count))
	50	return -EFAULT;
	51
	52	return count;
	53	}
	54
680ef72a	55	static __poll_t
618eabea TS	56	hwdep_poll(struct snd_hwdep hwdep, struct file file, poll_table *wait)
	57	{
	58	struct snd_bebob *bebob = hwdep->private_data;
680ef72a	59	__poll_t events;
618eabea TS	60
	61	poll_wait(file, &bebob->hwdep_wait, wait);
	62
	63	spin_lock_irq(&bebob->lock);
	64	if (bebob->dev_lock_changed)
a9a08845	65	events = EPOLLIN \| EPOLLRDNORM;
618eabea TS	66	else
	67	events = 0;
	68	spin_unlock_irq(&bebob->lock);
	69
	70	return events;
	71	}
	72
	73	static int
	74	hwdep_get_info(struct snd_bebob bebob, void __user arg)
	75	{
	76	struct fw_device *dev = fw_parent_device(bebob->unit);
	77	struct snd_firewire_get_info info;
	78
	79	memset(&info, 0, sizeof(info));
	80	info.type = SNDRV_FIREWIRE_TYPE_BEBOB;
	81	info.card = dev->card->index;
	82	(__be32 )&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
	83	(__be32 )&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
	84	strlcpy(info.device_name, dev_name(&dev->device),
	85	sizeof(info.device_name));
	86
	87	if (copy_to_user(arg, &info, sizeof(info)))
	88	return -EFAULT;
	89
	90	return 0;
	91	}
	92
	93	static int
	94	hwdep_lock(struct snd_bebob *bebob)
	95	{
	96	int err;
	97
	98	spin_lock_irq(&bebob->lock);
	99
	100	if (bebob->dev_lock_count == 0) {
	101	bebob->dev_lock_count = -1;
	102	err = 0;
	103	} else {
	104	err = -EBUSY;
	105	}
	106
	107	spin_unlock_irq(&bebob->lock);
	108
	109	return err;
	110	}
	111
	112	static int
	113	hwdep_unlock(struct snd_bebob *bebob)
	114	{
	115	int err;
	116
	117	spin_lock_irq(&bebob->lock);
	118
	119	if (bebob->dev_lock_count == -1) {
	120	bebob->dev_lock_count = 0;
	121	err = 0;
	122	} else {
	123	err = -EBADFD;
	124	}
	125
	126	spin_unlock_irq(&bebob->lock);
	127
	128	return err;
	129	}
130
131	static int
132	hwdep_release(struct snd_hwdep hwdep, struct file file)
133	{
134	struct snd_bebob *bebob = hwdep->private_data;
135
136	spin_lock_irq(&bebob->lock);
137	if (bebob->dev_lock_count == -1)
138	bebob->dev_lock_count = 0;
139	spin_unlock_irq(&bebob->lock);
140
141	return 0;
142	}
143
144	static int
145	hwdep_ioctl(struct snd_hwdep hwdep, struct file file,
146	unsigned int cmd, unsigned long arg)
147	{
148	struct snd_bebob *bebob = hwdep->private_data;
149
150	switch (cmd) {
151	case SNDRV_FIREWIRE_IOCTL_GET_INFO:
152	return hwdep_get_info(bebob, (void __user *)arg);
153	case SNDRV_FIREWIRE_IOCTL_LOCK:
154	return hwdep_lock(bebob);
155	case SNDRV_FIREWIRE_IOCTL_UNLOCK:
156	return hwdep_unlock(bebob);
157	default:
158	return -ENOIOCTLCMD;
159	}
160	}
161
162	#ifdef CONFIG_COMPAT
163	static int
164	hwdep_compat_ioctl(struct snd_hwdep hwdep, struct file file,
165	unsigned int cmd, unsigned long arg)
166	{
167	return hwdep_ioctl(hwdep, file, cmd,
168	(unsigned long)compat_ptr(arg));
169	}
170	#else
171	#define hwdep_compat_ioctl NULL
172	#endif
173
618eabea TS	174	int snd_bebob_create_hwdep_device(struct snd_bebob *bebob)
618eabea TS	175	{
4780f774 TS	176	static const struct snd_hwdep_ops ops = {
	177	.read = hwdep_read,
	178	.release = hwdep_release,
	179	.poll = hwdep_poll,
	180	.ioctl = hwdep_ioctl,
	181	.ioctl_compat = hwdep_compat_ioctl,
	182	};
618eabea TS	183	struct snd_hwdep *hwdep;
	184	int err;
	185
	186	err = snd_hwdep_new(bebob->card, "BeBoB", 0, &hwdep);
	187	if (err < 0)
	188	goto end;
	189	strcpy(hwdep->name, "BeBoB");
	190	hwdep->iface = SNDRV_HWDEP_IFACE_FW_BEBOB;
4780f774	191	hwdep->ops = ops;
618eabea TS	192	hwdep->private_data = bebob;
	193	hwdep->exclusive = true;
	194	end:
	195	return err;
	196	}
	197