[deliverable/linux.git] / sound / firewire / tascam / tascam-hwdep.c

/*
 * 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(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 = {
		.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS,
	};

	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);
	}

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

	spin_unlock_irq(&tscm->lock);

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

	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_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;
}
Commit	Line	Data
e5e0c3dd TS	1	/*
	2	* tascam-hwdep.c - a part of driver for TASCAM FireWire series
	3	*
	4	* Copyright (c) 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
	15	*/
	16
	17	#include "tascam.h"
	18
e5e0c3dd TS	19	static long hwdep_read(struct snd_hwdep hwdep, char __user buf, long count,
	20	loff_t *offset)
	21	{
	22	struct snd_tscm *tscm = hwdep->private_data;
	23	DEFINE_WAIT(wait);
04b2d9c9 TS	24	union snd_firewire_event event = {
	25	.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS,
	26	};
e5e0c3dd TS	27
	28	spin_lock_irq(&tscm->lock);
	29
	30	while (!tscm->dev_lock_changed) {
	31	prepare_to_wait(&tscm->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
	32	spin_unlock_irq(&tscm->lock);
	33	schedule();
	34	finish_wait(&tscm->hwdep_wait, &wait);
	35	if (signal_pending(current))
	36	return -ERESTARTSYS;
	37	spin_lock_irq(&tscm->lock);
	38	}
	39
04b2d9c9 TS	40	event.lock_status.status = (tscm->dev_lock_count > 0);
	41	tscm->dev_lock_changed = false;
	42
e5e0c3dd TS	43	spin_unlock_irq(&tscm->lock);
e5e0c3dd TS	44
04b2d9c9 TS	45	count = min_t(long, count, sizeof(event.lock_status));
	46
	47	if (copy_to_user(buf, &event, count))
	48	return -EFAULT;
	49
e5e0c3dd TS	50	return count;
	51	}
	52
	53	static unsigned int hwdep_poll(struct snd_hwdep hwdep, struct file file,
	54	poll_table *wait)
	55	{
	56	struct snd_tscm *tscm = hwdep->private_data;
	57	unsigned int events;
	58
	59	poll_wait(file, &tscm->hwdep_wait, wait);
	60
	61	spin_lock_irq(&tscm->lock);
	62	if (tscm->dev_lock_changed)
	63	events = POLLIN \| POLLRDNORM;
	64	else
	65	events = 0;
	66	spin_unlock_irq(&tscm->lock);
	67
	68	return events;
	69	}
	70
	71	static int hwdep_get_info(struct snd_tscm tscm, void __user arg)
	72	{
	73	struct fw_device *dev = fw_parent_device(tscm->unit);
	74	struct snd_firewire_get_info info;
	75
	76	memset(&info, 0, sizeof(info));
	77	info.type = SNDRV_FIREWIRE_TYPE_TASCAM;
	78	info.card = dev->card->index;
	79	(__be32 )&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
	80	(__be32 )&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
	81	strlcpy(info.device_name, dev_name(&dev->device),
	82	sizeof(info.device_name));
	83
	84	if (copy_to_user(arg, &info, sizeof(info)))
	85	return -EFAULT;
	86
	87	return 0;
	88	}
	89
	90	static int hwdep_lock(struct snd_tscm *tscm)
	91	{
	92	int err;
	93
	94	spin_lock_irq(&tscm->lock);
	95
	96	if (tscm->dev_lock_count == 0) {
	97	tscm->dev_lock_count = -1;
	98	err = 0;
	99	} else {
	100	err = -EBUSY;
	101	}
	102
	103	spin_unlock_irq(&tscm->lock);
	104
	105	return err;
	106	}
	107
	108	static int hwdep_unlock(struct snd_tscm *tscm)
	109	{
	110	int err;
	111
	112	spin_lock_irq(&tscm->lock);
	113
114	if (tscm->dev_lock_count == -1) {
115	tscm->dev_lock_count = 0;
116	err = 0;
117	} else {
118	err = -EBADFD;
119	}
120
121	spin_unlock_irq(&tscm->lock);
122
123	return err;
124	}
125
126	static int hwdep_release(struct snd_hwdep hwdep, struct file file)
127	{
128	struct snd_tscm *tscm = hwdep->private_data;
129
130	spin_lock_irq(&tscm->lock);
131	if (tscm->dev_lock_count == -1)
132	tscm->dev_lock_count = 0;
133	spin_unlock_irq(&tscm->lock);
134
135	return 0;
136	}
137
138	static int hwdep_ioctl(struct snd_hwdep hwdep, struct file file,
139	unsigned int cmd, unsigned long arg)
140	{
141	struct snd_tscm *tscm = hwdep->private_data;
142
143	switch (cmd) {
144	case SNDRV_FIREWIRE_IOCTL_GET_INFO:
145	return hwdep_get_info(tscm, (void __user *)arg);
146	case SNDRV_FIREWIRE_IOCTL_LOCK:
147	return hwdep_lock(tscm);
148	case SNDRV_FIREWIRE_IOCTL_UNLOCK:
149	return hwdep_unlock(tscm);
150	default:
151	return -ENOIOCTLCMD;
152	}
153	}
154
155	#ifdef CONFIG_COMPAT
156	static int hwdep_compat_ioctl(struct snd_hwdep hwdep, struct file file,
157	unsigned int cmd, unsigned long arg)
158	{
159	return hwdep_ioctl(hwdep, file, cmd,
160	(unsigned long)compat_ptr(arg));
161	}
162	#else
163	#define hwdep_compat_ioctl NULL
164	#endif
165
166	static const struct snd_hwdep_ops hwdep_ops = {
167	.read = hwdep_read,
168	.release = hwdep_release,
169	.poll = hwdep_poll,
170	.ioctl = hwdep_ioctl,
171	.ioctl_compat = hwdep_compat_ioctl,
172	};
173
174	int snd_tscm_create_hwdep_device(struct snd_tscm *tscm)
175	{
176	struct snd_hwdep *hwdep;
177	int err;
178
179	err = snd_hwdep_new(tscm->card, "Tascam", 0, &hwdep);
180	if (err < 0)
181	return err;
182
183	strcpy(hwdep->name, "Tascam");
184	hwdep->iface = SNDRV_HWDEP_IFACE_FW_TASCAM;
185	hwdep->ops = hwdep_ops;
186	hwdep->private_data = tscm;
187	hwdep->exclusive = true;
188
189	return err;
190	}