[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_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;
}
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
	19	static long hwdep_read_locked(struct snd_tscm tscm, char __user buf,
	20	long count)
	21	{
	22	union snd_firewire_event event;
	23
	24	memset(&event, 0, sizeof(event));
	25
	26	event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
	27	event.lock_status.status = (tscm->dev_lock_count > 0);
	28	tscm->dev_lock_changed = false;
	29
	30	count = min_t(long, count, sizeof(event.lock_status));
	31
	32	if (copy_to_user(buf, &event, count))
	33	return -EFAULT;
	34
	35	return count;
	36	}
	37
	38	static long hwdep_read(struct snd_hwdep hwdep, char __user buf, long count,
	39	loff_t *offset)
	40	{
	41	struct snd_tscm *tscm = hwdep->private_data;
	42	DEFINE_WAIT(wait);
	43	union snd_firewire_event event;
	44
	45	spin_lock_irq(&tscm->lock);
	46
	47	while (!tscm->dev_lock_changed) {
	48	prepare_to_wait(&tscm->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
	49	spin_unlock_irq(&tscm->lock);
	50	schedule();
	51	finish_wait(&tscm->hwdep_wait, &wait);
	52	if (signal_pending(current))
	53	return -ERESTARTSYS;
	54	spin_lock_irq(&tscm->lock);
	55	}
	56
	57	memset(&event, 0, sizeof(event));
	58	count = hwdep_read_locked(tscm, buf, count);
	59	spin_unlock_irq(&tscm->lock);
	60
	61	return count;
	62	}
	63
	64	static unsigned int hwdep_poll(struct snd_hwdep hwdep, struct file file,
65	poll_table *wait)
66	{
67	struct snd_tscm *tscm = hwdep->private_data;
68	unsigned int events;
69
70	poll_wait(file, &tscm->hwdep_wait, wait);
71
72	spin_lock_irq(&tscm->lock);
73	if (tscm->dev_lock_changed)
74	events = POLLIN \| POLLRDNORM;
75	else
76	events = 0;
77	spin_unlock_irq(&tscm->lock);
78
79	return events;
80	}
81
82	static int hwdep_get_info(struct snd_tscm tscm, void __user arg)
83	{
84	struct fw_device *dev = fw_parent_device(tscm->unit);
85	struct snd_firewire_get_info info;
86
87	memset(&info, 0, sizeof(info));
88	info.type = SNDRV_FIREWIRE_TYPE_TASCAM;
89	info.card = dev->card->index;
90	(__be32 )&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
91	(__be32 )&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
92	strlcpy(info.device_name, dev_name(&dev->device),
93	sizeof(info.device_name));
94
95	if (copy_to_user(arg, &info, sizeof(info)))
96	return -EFAULT;
97
98	return 0;
99	}
100
101	static int hwdep_lock(struct snd_tscm *tscm)
102	{
103	int err;
104
105	spin_lock_irq(&tscm->lock);
106
107	if (tscm->dev_lock_count == 0) {
108	tscm->dev_lock_count = -1;
109	err = 0;
110	} else {
111	err = -EBUSY;
112	}
113
114	spin_unlock_irq(&tscm->lock);
115
116	return err;
117	}
118
119	static int hwdep_unlock(struct snd_tscm *tscm)
120	{
121	int err;
122
123	spin_lock_irq(&tscm->lock);
124
125	if (tscm->dev_lock_count == -1) {
126	tscm->dev_lock_count = 0;
127	err = 0;
128	} else {
129	err = -EBADFD;
130	}
131
132	spin_unlock_irq(&tscm->lock);
133
134	return err;
135	}
136
137	static int hwdep_release(struct snd_hwdep hwdep, struct file file)
138	{
139	struct snd_tscm *tscm = hwdep->private_data;
140
141	spin_lock_irq(&tscm->lock);
142	if (tscm->dev_lock_count == -1)
143	tscm->dev_lock_count = 0;
144	spin_unlock_irq(&tscm->lock);
145
146	return 0;
147	}
148
149	static int hwdep_ioctl(struct snd_hwdep hwdep, struct file file,
150	unsigned int cmd, unsigned long arg)
151	{
152	struct snd_tscm *tscm = hwdep->private_data;
153
154	switch (cmd) {
155	case SNDRV_FIREWIRE_IOCTL_GET_INFO:
156	return hwdep_get_info(tscm, (void __user *)arg);
157	case SNDRV_FIREWIRE_IOCTL_LOCK:
158	return hwdep_lock(tscm);
159	case SNDRV_FIREWIRE_IOCTL_UNLOCK:
160	return hwdep_unlock(tscm);
161	default:
162	return -ENOIOCTLCMD;
163	}
164	}
165
166	#ifdef CONFIG_COMPAT
167	static int hwdep_compat_ioctl(struct snd_hwdep hwdep, struct file file,
168	unsigned int cmd, unsigned long arg)
169	{
170	return hwdep_ioctl(hwdep, file, cmd,
171	(unsigned long)compat_ptr(arg));
172	}
173	#else
174	#define hwdep_compat_ioctl NULL
175	#endif
176
177	static const struct snd_hwdep_ops hwdep_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
185	int snd_tscm_create_hwdep_device(struct snd_tscm *tscm)
186	{
187	struct snd_hwdep *hwdep;
188	int err;
189
190	err = snd_hwdep_new(tscm->card, "Tascam", 0, &hwdep);
191	if (err < 0)
192	return err;
193
194	strcpy(hwdep->name, "Tascam");
195	hwdep->iface = SNDRV_HWDEP_IFACE_FW_TASCAM;
196	hwdep->ops = hwdep_ops;
197	hwdep->private_data = tscm;
198	hwdep->exclusive = true;
199
200	return err;
201	}