[mirror_ubuntu-artful-kernel.git] / sound / firewire / oxfw / oxfw-hwdep.c

/*
 * oxfw_hwdep.c - a part of driver for OXFW970/971 based devices
 *
 * Copyright (c) 2014 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 "oxfw.h"

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

	spin_lock_irq(&oxfw->lock);

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

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

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

	spin_unlock_irq(&oxfw->lock);

	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_oxfw *oxfw = hwdep->private_data;
	unsigned int events;

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

	spin_lock_irq(&oxfw->lock);
	if (oxfw->dev_lock_changed)
		events = POLLIN | POLLRDNORM;
	else
		events = 0;
	spin_unlock_irq(&oxfw->lock);

	return events;
}

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

	memset(&info, 0, sizeof(info));
	info.type = SNDRV_FIREWIRE_TYPE_OXFW;
	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_oxfw *oxfw)
{
	int err;

	spin_lock_irq(&oxfw->lock);

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

	spin_unlock_irq(&oxfw->lock);

	return err;
}

static int hwdep_unlock(struct snd_oxfw *oxfw)
{
	int err;

	spin_lock_irq(&oxfw->lock);

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

	spin_unlock_irq(&oxfw->lock);

	return err;
}

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

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

	return 0;
}

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

	switch (cmd) {
	case SNDRV_FIREWIRE_IOCTL_GET_INFO:
		return hwdep_get_info(oxfw, (void __user *)arg);
	case SNDRV_FIREWIRE_IOCTL_LOCK:
		return hwdep_lock(oxfw);
	case SNDRV_FIREWIRE_IOCTL_UNLOCK:
		return hwdep_unlock(oxfw);
	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_oxfw_create_hwdep(struct snd_oxfw *oxfw)
{
	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,
	};
	struct snd_hwdep *hwdep;
	int err;

	err = snd_hwdep_new(oxfw->card, oxfw->card->driver, 0, &hwdep);
	if (err < 0)
		goto end;
	strcpy(hwdep->name, oxfw->card->driver);
	hwdep->iface = SNDRV_HWDEP_IFACE_FW_OXFW;
	hwdep->ops = hwdep_ops;
	hwdep->private_data = oxfw;
	hwdep->exclusive = true;
end:
	return err;
}
Commit	Line	Data
8985f4ac TS	1	/*
	2	* oxfw_hwdep.c - a part of driver for OXFW970/971 based devices
	3	*
	4	* Copyright (c) 2014 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 "oxfw.h"
	18
	19	static long hwdep_read(struct snd_hwdep hwdep, char __user buf, long count,
	20	loff_t *offset)
	21	{
	22	struct snd_oxfw *oxfw = hwdep->private_data;
	23	DEFINE_WAIT(wait);
	24	union snd_firewire_event event;
	25
	26	spin_lock_irq(&oxfw->lock);
	27
	28	while (!oxfw->dev_lock_changed) {
	29	prepare_to_wait(&oxfw->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
	30	spin_unlock_irq(&oxfw->lock);
	31	schedule();
	32	finish_wait(&oxfw->hwdep_wait, &wait);
	33	if (signal_pending(current))
	34	return -ERESTARTSYS;
	35	spin_lock_irq(&oxfw->lock);
	36	}
	37
	38	memset(&event, 0, sizeof(event));
	39	if (oxfw->dev_lock_changed) {
	40	event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
	41	event.lock_status.status = (oxfw->dev_lock_count > 0);
	42	oxfw->dev_lock_changed = false;
	43
	44	count = min_t(long, count, sizeof(event.lock_status));
	45	}
	46
	47	spin_unlock_irq(&oxfw->lock);
	48
	49	if (copy_to_user(buf, &event, count))
	50	return -EFAULT;
	51
	52	return count;
	53	}
	54
	55	static unsigned int hwdep_poll(struct snd_hwdep hwdep, struct file file,
	56	poll_table *wait)
	57	{
	58	struct snd_oxfw *oxfw = hwdep->private_data;
	59	unsigned int events;
	60
	61	poll_wait(file, &oxfw->hwdep_wait, wait);
	62
	63	spin_lock_irq(&oxfw->lock);
	64	if (oxfw->dev_lock_changed)
65	events = POLLIN \| POLLRDNORM;
66	else
67	events = 0;
68	spin_unlock_irq(&oxfw->lock);
69
70	return events;
71	}
72
73	static int hwdep_get_info(struct snd_oxfw oxfw, void __user arg)
74	{
75	struct fw_device *dev = fw_parent_device(oxfw->unit);
76	struct snd_firewire_get_info info;
77
78	memset(&info, 0, sizeof(info));
79	info.type = SNDRV_FIREWIRE_TYPE_OXFW;
80	info.card = dev->card->index;
81	(__be32 )&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
82	(__be32 )&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
83	strlcpy(info.device_name, dev_name(&dev->device),
84	sizeof(info.device_name));
85
86	if (copy_to_user(arg, &info, sizeof(info)))
87	return -EFAULT;
88
89	return 0;
90	}
91
92	static int hwdep_lock(struct snd_oxfw *oxfw)
93	{
94	int err;
95
96	spin_lock_irq(&oxfw->lock);
97
98	if (oxfw->dev_lock_count == 0) {
99	oxfw->dev_lock_count = -1;
100	err = 0;
101	} else {
102	err = -EBUSY;
103	}
104
105	spin_unlock_irq(&oxfw->lock);
106
107	return err;
108	}
109
110	static int hwdep_unlock(struct snd_oxfw *oxfw)
111	{
112	int err;
113
114	spin_lock_irq(&oxfw->lock);
115
116	if (oxfw->dev_lock_count == -1) {
117	oxfw->dev_lock_count = 0;
118	err = 0;
119	} else {
120	err = -EBADFD;
121	}
122
123	spin_unlock_irq(&oxfw->lock);
124
125	return err;
126	}
127
128	static int hwdep_release(struct snd_hwdep hwdep, struct file file)
129	{
130	struct snd_oxfw *oxfw = hwdep->private_data;
131
132	spin_lock_irq(&oxfw->lock);
133	if (oxfw->dev_lock_count == -1)
134	oxfw->dev_lock_count = 0;
135	spin_unlock_irq(&oxfw->lock);
136
137	return 0;
138	}
139
140	static int hwdep_ioctl(struct snd_hwdep hwdep, struct file file,
141	unsigned int cmd, unsigned long arg)
142	{
143	struct snd_oxfw *oxfw = hwdep->private_data;
144
145	switch (cmd) {
146	case SNDRV_FIREWIRE_IOCTL_GET_INFO:
147	return hwdep_get_info(oxfw, (void __user *)arg);
148	case SNDRV_FIREWIRE_IOCTL_LOCK:
149	return hwdep_lock(oxfw);
150	case SNDRV_FIREWIRE_IOCTL_UNLOCK:
151	return hwdep_unlock(oxfw);
152	default:
153	return -ENOIOCTLCMD;
154	}
155	}
156
157	#ifdef CONFIG_COMPAT
158	static int hwdep_compat_ioctl(struct snd_hwdep hwdep, struct file file,
159	unsigned int cmd, unsigned long arg)
160	{
161	return hwdep_ioctl(hwdep, file, cmd,
162	(unsigned long)compat_ptr(arg));
163	}
164	#else
165	#define hwdep_compat_ioctl NULL
166	#endif
167
168	int snd_oxfw_create_hwdep(struct snd_oxfw *oxfw)
169	{
170	static const struct snd_hwdep_ops hwdep_ops = {
171	.read = hwdep_read,
172	.release = hwdep_release,
173	.poll = hwdep_poll,
174	.ioctl = hwdep_ioctl,
175	.ioctl_compat = hwdep_compat_ioctl,
176	};
177	struct snd_hwdep *hwdep;
178	int err;
179
180	err = snd_hwdep_new(oxfw->card, oxfw->card->driver, 0, &hwdep);
181	if (err < 0)
182	goto end;
183	strcpy(hwdep->name, oxfw->card->driver);
184	hwdep->iface = SNDRV_HWDEP_IFACE_FW_OXFW;
185	hwdep->ops = hwdep_ops;
186	hwdep->private_data = oxfw;
187	hwdep->exclusive = true;
188	end:
189	return err;
190	}