[deliverable/linux.git] / sound / core / hwdep.c

/*
 *  Hardware dependent layer
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/major.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/minors.h>
#include <sound/hwdep.h>
#include <sound/info.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Hardware dependent layer");
MODULE_LICENSE("GPL");

static LIST_HEAD(snd_hwdep_devices);
static DEFINE_MUTEX(register_mutex);

static int snd_hwdep_dev_free(struct snd_device *device);
static int snd_hwdep_dev_register(struct snd_device *device);
static int snd_hwdep_dev_disconnect(struct snd_device *device);


static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device)
{
	struct snd_hwdep *hwdep;

	list_for_each_entry(hwdep, &snd_hwdep_devices, list)
		if (hwdep->card == card && hwdep->device == device)
			return hwdep;
	return NULL;
}

static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
{
	struct snd_hwdep *hw = file->private_data;
	if (hw->ops.llseek)
		return hw->ops.llseek(hw, file, offset, orig);
	return -ENXIO;
}

static ssize_t snd_hwdep_read(struct file * file, char __user *buf,
			      size_t count, loff_t *offset)
{
	struct snd_hwdep *hw = file->private_data;
	if (hw->ops.read)
		return hw->ops.read(hw, buf, count, offset);
	return -ENXIO;	
}

static ssize_t snd_hwdep_write(struct file * file, const char __user *buf,
			       size_t count, loff_t *offset)
{
	struct snd_hwdep *hw = file->private_data;
	if (hw->ops.write)
		return hw->ops.write(hw, buf, count, offset);
	return -ENXIO;	
}

static int snd_hwdep_open(struct inode *inode, struct file * file)
{
	int major = imajor(inode);
	struct snd_hwdep *hw;
	int err;
	wait_queue_t wait;

	if (major == snd_major) {
		hw = snd_lookup_minor_data(iminor(inode),
					   SNDRV_DEVICE_TYPE_HWDEP);
#ifdef CONFIG_SND_OSSEMUL
	} else if (major == SOUND_MAJOR) {
		hw = snd_lookup_oss_minor_data(iminor(inode),
					       SNDRV_OSS_DEVICE_TYPE_DMFM);
#endif
	} else
		return -ENXIO;
	if (hw == NULL)
		return -ENODEV;

	if (!try_module_get(hw->card->module)) {
		snd_card_unref(hw->card);
		return -EFAULT;
	}

	init_waitqueue_entry(&wait, current);
	add_wait_queue(&hw->open_wait, &wait);
	mutex_lock(&hw->open_mutex);
	while (1) {
		if (hw->exclusive && hw->used > 0) {
			err = -EBUSY;
			break;
		}
		if (!hw->ops.open) {
			err = 0;
			break;
		}
		err = hw->ops.open(hw, file);
		if (err >= 0)
			break;
		if (err == -EAGAIN) {
			if (file->f_flags & O_NONBLOCK) {
				err = -EBUSY;
				break;
			}
		} else
			break;
		set_current_state(TASK_INTERRUPTIBLE);
		mutex_unlock(&hw->open_mutex);
		schedule();
		mutex_lock(&hw->open_mutex);
		if (hw->card->shutdown) {
			err = -ENODEV;
			break;
		}
		if (signal_pending(current)) {
			err = -ERESTARTSYS;
			break;
		}
	}
	remove_wait_queue(&hw->open_wait, &wait);
	if (err >= 0) {
		err = snd_card_file_add(hw->card, file);
		if (err >= 0) {
			file->private_data = hw;
			hw->used++;
		} else {
			if (hw->ops.release)
				hw->ops.release(hw, file);
		}
	}
	mutex_unlock(&hw->open_mutex);
	if (err < 0)
		module_put(hw->card->module);
	snd_card_unref(hw->card);
	return err;
}

static int snd_hwdep_release(struct inode *inode, struct file * file)
{
	int err = 0;
	struct snd_hwdep *hw = file->private_data;
	struct module *mod = hw->card->module;

	mutex_lock(&hw->open_mutex);
	if (hw->ops.release)
		err = hw->ops.release(hw, file);
	if (hw->used > 0)
		hw->used--;
	mutex_unlock(&hw->open_mutex);
	wake_up(&hw->open_wait);

	snd_card_file_remove(hw->card, file);
	module_put(mod);
	return err;
}

static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
{
	struct snd_hwdep *hw = file->private_data;
	if (hw->ops.poll)
		return hw->ops.poll(hw, file, wait);
	return 0;
}

static int snd_hwdep_info(struct snd_hwdep *hw,
			  struct snd_hwdep_info __user *_info)
{
	struct snd_hwdep_info info;
	
	memset(&info, 0, sizeof(info));
	info.card = hw->card->number;
	strlcpy(info.id, hw->id, sizeof(info.id));	
	strlcpy(info.name, hw->name, sizeof(info.name));
	info.iface = hw->iface;
	if (copy_to_user(_info, &info, sizeof(info)))
		return -EFAULT;
	return 0;
}

static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
				struct snd_hwdep_dsp_status __user *_info)
{
	struct snd_hwdep_dsp_status info;
	int err;
	
	if (! hw->ops.dsp_status)
		return -ENXIO;
	memset(&info, 0, sizeof(info));
	info.dsp_loaded = hw->dsp_loaded;
	if ((err = hw->ops.dsp_status(hw, &info)) < 0)
		return err;
	if (copy_to_user(_info, &info, sizeof(info)))
		return -EFAULT;
	return 0;
}

static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
			      struct snd_hwdep_dsp_image __user *_info)
{
	struct snd_hwdep_dsp_image info;
	int err;
	
	if (! hw->ops.dsp_load)
		return -ENXIO;
	memset(&info, 0, sizeof(info));
	if (copy_from_user(&info, _info, sizeof(info)))
		return -EFAULT;
	/* check whether the dsp was already loaded */
	if (hw->dsp_loaded & (1 << info.index))
		return -EBUSY;
	if (!access_ok(VERIFY_READ, info.image, info.length))
		return -EFAULT;
	err = hw->ops.dsp_load(hw, &info);
	if (err < 0)
		return err;
	hw->dsp_loaded |= (1 << info.index);
	return 0;
}

static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
			    unsigned long arg)
{
	struct snd_hwdep *hw = file->private_data;
	void __user *argp = (void __user *)arg;
	switch (cmd) {
	case SNDRV_HWDEP_IOCTL_PVERSION:
		return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
	case SNDRV_HWDEP_IOCTL_INFO:
		return snd_hwdep_info(hw, argp);
	case SNDRV_HWDEP_IOCTL_DSP_STATUS:
		return snd_hwdep_dsp_status(hw, argp);
	case SNDRV_HWDEP_IOCTL_DSP_LOAD:
		return snd_hwdep_dsp_load(hw, argp);
	}
	if (hw->ops.ioctl)
		return hw->ops.ioctl(hw, file, cmd, arg);
	return -ENOTTY;
}

static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
{
	struct snd_hwdep *hw = file->private_data;
	if (hw->ops.mmap)
		return hw->ops.mmap(hw, file, vma);
	return -ENXIO;
}

static int snd_hwdep_control_ioctl(struct snd_card *card,
				   struct snd_ctl_file * control,
				   unsigned int cmd, unsigned long arg)
{
	switch (cmd) {
	case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
		{
			int device;

			if (get_user(device, (int __user *)arg))
				return -EFAULT;
			mutex_lock(&register_mutex);

			if (device < 0)
				device = 0;
			else if (device < SNDRV_MINOR_HWDEPS)
				device++;
			else
				device = SNDRV_MINOR_HWDEPS;

			while (device < SNDRV_MINOR_HWDEPS) {
				if (snd_hwdep_search(card, device))
					break;
				device++;
			}
			if (device >= SNDRV_MINOR_HWDEPS)
				device = -1;
			mutex_unlock(&register_mutex);
			if (put_user(device, (int __user *)arg))
				return -EFAULT;
			return 0;
		}
	case SNDRV_CTL_IOCTL_HWDEP_INFO:
		{
			struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
			int device, err;
			struct snd_hwdep *hwdep;

			if (get_user(device, &info->device))
				return -EFAULT;
			mutex_lock(&register_mutex);
			hwdep = snd_hwdep_search(card, device);
			if (hwdep)
				err = snd_hwdep_info(hwdep, info);
			else
				err = -ENXIO;
			mutex_unlock(&register_mutex);
			return err;
		}
	}
	return -ENOIOCTLCMD;
}

#ifdef CONFIG_COMPAT
#include "hwdep_compat.c"
#else
#define snd_hwdep_ioctl_compat	NULL
#endif

/*

 */

static const struct file_operations snd_hwdep_f_ops =
{
	.owner = 	THIS_MODULE,
	.llseek =	snd_hwdep_llseek,
	.read = 	snd_hwdep_read,
	.write =	snd_hwdep_write,
	.open =		snd_hwdep_open,
	.release =	snd_hwdep_release,
	.poll =		snd_hwdep_poll,
	.unlocked_ioctl =	snd_hwdep_ioctl,
	.compat_ioctl =	snd_hwdep_ioctl_compat,
	.mmap =		snd_hwdep_mmap,
};

static void release_hwdep_device(struct device *dev)
{
	kfree(container_of(dev, struct snd_hwdep, dev));
}

/**
 * snd_hwdep_new - create a new hwdep instance
 * @card: the card instance
 * @id: the id string
 * @device: the device index (zero-based)
 * @rhwdep: the pointer to store the new hwdep instance
 *
 * Creates a new hwdep instance with the given index on the card.
 * The callbacks (hwdep->ops) must be set on the returned instance
 * after this call manually by the caller.
 *
 * Return: Zero if successful, or a negative error code on failure.
 */
int snd_hwdep_new(struct snd_card *card, char *id, int device,
		  struct snd_hwdep **rhwdep)
{
	struct snd_hwdep *hwdep;
	int err;
	static struct snd_device_ops ops = {
		.dev_free = snd_hwdep_dev_free,
		.dev_register = snd_hwdep_dev_register,
		.dev_disconnect = snd_hwdep_dev_disconnect,
	};

	if (snd_BUG_ON(!card))
		return -ENXIO;
	if (rhwdep)
		*rhwdep = NULL;
	hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
	if (hwdep == NULL) {
		dev_err(card->dev, "hwdep: cannot allocate\n");
		return -ENOMEM;
	}

	init_waitqueue_head(&hwdep->open_wait);
	mutex_init(&hwdep->open_mutex);
	hwdep->card = card;
	hwdep->device = device;
	if (id)
		strlcpy(hwdep->id, id, sizeof(hwdep->id));

	snd_device_initialize(&hwdep->dev, card);
	hwdep->dev.release = release_hwdep_device;
	dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device);
#ifdef CONFIG_SND_OSSEMUL
	hwdep->oss_type = -1;
#endif

	err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops);
	if (err < 0) {
		put_device(&hwdep->dev);
		return err;
	}

	if (rhwdep)
		*rhwdep = hwdep;
	return 0;
}
EXPORT_SYMBOL(snd_hwdep_new);

static int snd_hwdep_dev_free(struct snd_device *device)
{
	struct snd_hwdep *hwdep = device->device_data;
	if (!hwdep)
		return 0;
	if (hwdep->private_free)
		hwdep->private_free(hwdep);
	put_device(&hwdep->dev);
	return 0;
}

static int snd_hwdep_dev_register(struct snd_device *device)
{
	struct snd_hwdep *hwdep = device->device_data;
	struct snd_card *card = hwdep->card;
	int err;

	mutex_lock(&register_mutex);
	if (snd_hwdep_search(card, hwdep->device)) {
		mutex_unlock(&register_mutex);
		return -EBUSY;
	}
	list_add_tail(&hwdep->list, &snd_hwdep_devices);
	err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
				  hwdep->card, hwdep->device,
				  &snd_hwdep_f_ops, hwdep, &hwdep->dev);
	if (err < 0) {
		dev_err(&hwdep->dev, "unable to register\n");
		list_del(&hwdep->list);
		mutex_unlock(&register_mutex);
		return err;
	}

#ifdef CONFIG_SND_OSSEMUL
	hwdep->ossreg = 0;
	if (hwdep->oss_type >= 0) {
		if (hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM &&
		    hwdep->device)
			dev_warn(&hwdep->dev,
				 "only hwdep device 0 can be registered as OSS direct FM device!\n");
		else if (snd_register_oss_device(hwdep->oss_type,
						 card, hwdep->device,
						 &snd_hwdep_f_ops, hwdep) < 0)
			dev_warn(&hwdep->dev,
				 "unable to register OSS compatibility device\n");
		else
			hwdep->ossreg = 1;
	}
#endif
	mutex_unlock(&register_mutex);
	return 0;
}

static int snd_hwdep_dev_disconnect(struct snd_device *device)
{
	struct snd_hwdep *hwdep = device->device_data;

	if (snd_BUG_ON(!hwdep))
		return -ENXIO;
	mutex_lock(&register_mutex);
	if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
		mutex_unlock(&register_mutex);
		return -EINVAL;
	}
	mutex_lock(&hwdep->open_mutex);
	wake_up(&hwdep->open_wait);
#ifdef CONFIG_SND_OSSEMUL
	if (hwdep->ossreg)
		snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
#endif
	snd_unregister_device(&hwdep->dev);
	list_del_init(&hwdep->list);
	mutex_unlock(&hwdep->open_mutex);
	mutex_unlock(&register_mutex);
	return 0;
}

#ifdef CONFIG_PROC_FS
/*
 *  Info interface
 */

static void snd_hwdep_proc_read(struct snd_info_entry *entry,
				struct snd_info_buffer *buffer)
{
	struct snd_hwdep *hwdep;

	mutex_lock(&register_mutex);
	list_for_each_entry(hwdep, &snd_hwdep_devices, list)
		snd_iprintf(buffer, "%02i-%02i: %s\n",
			    hwdep->card->number, hwdep->device, hwdep->name);
	mutex_unlock(&register_mutex);
}

static struct snd_info_entry *snd_hwdep_proc_entry;

static void __init snd_hwdep_proc_init(void)
{
	struct snd_info_entry *entry;

	if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
		entry->c.text.read = snd_hwdep_proc_read;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			entry = NULL;
		}
	}
	snd_hwdep_proc_entry = entry;
}

static void __exit snd_hwdep_proc_done(void)
{
	snd_info_free_entry(snd_hwdep_proc_entry);
}
#else /* !CONFIG_PROC_FS */
#define snd_hwdep_proc_init()
#define snd_hwdep_proc_done()
#endif /* CONFIG_PROC_FS */


/*
 *  ENTRY functions
 */

static int __init alsa_hwdep_init(void)
{
	snd_hwdep_proc_init();
	snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
	snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
	return 0;
}

static void __exit alsa_hwdep_exit(void)
{
	snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
	snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
	snd_hwdep_proc_done();
}

module_init(alsa_hwdep_init)
module_exit(alsa_hwdep_exit)
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* Hardware dependent layer
c1017a4c	3	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	4	*
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
1da177e4 LT	22	#include <linux/major.h>
1da177e4 LT	23	#include <linux/init.h>
1da177e4 LT	24	#include <linux/slab.h>
1da177e4 LT	25	#include <linux/time.h>
1a60d4c5	26	#include <linux/mutex.h>
da155d5b	27	#include <linux/module.h>
1da177e4 LT	28	#include <sound/core.h>
	29	#include <sound/control.h>
	30	#include <sound/minors.h>
	31	#include <sound/hwdep.h>
	32	#include <sound/info.h>
	33
c1017a4c	34	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	35	MODULE_DESCRIPTION("Hardware dependent layer");
	36	MODULE_LICENSE("GPL");
	37
f87135f5	38	static LIST_HEAD(snd_hwdep_devices);
1a60d4c5	39	static DEFINE_MUTEX(register_mutex);
1da177e4	40
d9a98de2 TI	41	static int snd_hwdep_dev_free(struct snd_device *device);
d9a98de2 TI	42	static int snd_hwdep_dev_register(struct snd_device *device);
c461482c	43	static int snd_hwdep_dev_disconnect(struct snd_device *device);
1da177e4	44
1da177e4	45
f87135f5 CL	46	static struct snd_hwdep snd_hwdep_search(struct snd_card card, int device)
f87135f5 CL	47	{
f87135f5 CL	48	struct snd_hwdep *hwdep;
f87135f5 CL	49
9244b2c3	50	list_for_each_entry(hwdep, &snd_hwdep_devices, list)
f87135f5 CL	51	if (hwdep->card == card && hwdep->device == device)
f87135f5 CL	52	return hwdep;
f87135f5 CL	53	return NULL;
f87135f5 CL	54	}
1da177e4 LT	55
	56	static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
	57	{
d9a98de2	58	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	59	if (hw->ops.llseek)
	60	return hw->ops.llseek(hw, file, offset, orig);
	61	return -ENXIO;
	62	}
	63
d9a98de2 TI	64	static ssize_t snd_hwdep_read(struct file * file, char __user *buf,
d9a98de2 TI	65	size_t count, loff_t *offset)
1da177e4	66	{
d9a98de2	67	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	68	if (hw->ops.read)
	69	return hw->ops.read(hw, buf, count, offset);
	70	return -ENXIO;
	71	}
	72
d9a98de2 TI	73	static ssize_t snd_hwdep_write(struct file * file, const char __user *buf,
d9a98de2 TI	74	size_t count, loff_t *offset)
1da177e4	75	{
d9a98de2	76	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	77	if (hw->ops.write)
	78	return hw->ops.write(hw, buf, count, offset);
	79	return -ENXIO;
	80	}
	81
	82	static int snd_hwdep_open(struct inode inode, struct file file)
	83	{
	84	int major = imajor(inode);
d9a98de2	85	struct snd_hwdep *hw;
1da177e4 LT	86	int err;
	87	wait_queue_t wait;
	88
f1902860	89	if (major == snd_major) {
f87135f5 CL	90	hw = snd_lookup_minor_data(iminor(inode),
f87135f5 CL	91	SNDRV_DEVICE_TYPE_HWDEP);
1da177e4	92	#ifdef CONFIG_SND_OSSEMUL
f1902860	93	} else if (major == SOUND_MAJOR) {
f87135f5 CL	94	hw = snd_lookup_oss_minor_data(iminor(inode),
f87135f5 CL	95	SNDRV_OSS_DEVICE_TYPE_DMFM);
1da177e4	96	#endif
f1902860	97	} else
1da177e4	98	return -ENXIO;
1da177e4 LT	99	if (hw == NULL)
	100	return -ENODEV;
	101
a0830dbd TI	102	if (!try_module_get(hw->card->module)) {
a0830dbd TI	103	snd_card_unref(hw->card);
1da177e4	104	return -EFAULT;
a0830dbd	105	}
1da177e4 LT	106
	107	init_waitqueue_entry(&wait, current);
	108	add_wait_queue(&hw->open_wait, &wait);
1a60d4c5	109	mutex_lock(&hw->open_mutex);
1da177e4 LT	110	while (1) {
	111	if (hw->exclusive && hw->used > 0) {
	112	err = -EBUSY;
	113	break;
	114	}
345d0b19 TI	115	if (!hw->ops.open) {
	116	err = 0;
	117	break;
	118	}
1da177e4 LT	119	err = hw->ops.open(hw, file);
	120	if (err >= 0)
	121	break;
	122	if (err == -EAGAIN) {
	123	if (file->f_flags & O_NONBLOCK) {
	124	err = -EBUSY;
	125	break;
	126	}
	127	} else
	128	break;
	129	set_current_state(TASK_INTERRUPTIBLE);
1a60d4c5	130	mutex_unlock(&hw->open_mutex);
1da177e4	131	schedule();
1a60d4c5	132	mutex_lock(&hw->open_mutex);
0914f796 TI	133	if (hw->card->shutdown) {
	134	err = -ENODEV;
	135	break;
	136	}
1da177e4 LT	137	if (signal_pending(current)) {
	138	err = -ERESTARTSYS;
	139	break;
	140	}
	141	}
	142	remove_wait_queue(&hw->open_wait, &wait);
	143	if (err >= 0) {
	144	err = snd_card_file_add(hw->card, file);
	145	if (err >= 0) {
	146	file->private_data = hw;
	147	hw->used++;
	148	} else {
	149	if (hw->ops.release)
	150	hw->ops.release(hw, file);
	151	}
	152	}
1a60d4c5	153	mutex_unlock(&hw->open_mutex);
1da177e4 LT	154	if (err < 0)
1da177e4 LT	155	module_put(hw->card->module);
a0830dbd	156	snd_card_unref(hw->card);
1da177e4 LT	157	return err;
	158	}
	159
	160	static int snd_hwdep_release(struct inode inode, struct file file)
	161	{
345d0b19	162	int err = 0;
d9a98de2	163	struct snd_hwdep *hw = file->private_data;
104326f8	164	struct module *mod = hw->card->module;
8fa58af7	165
1a60d4c5	166	mutex_lock(&hw->open_mutex);
8fa58af7	167	if (hw->ops.release)
1da177e4	168	err = hw->ops.release(hw, file);
1da177e4 LT	169	if (hw->used > 0)
1da177e4 LT	170	hw->used--;
1a60d4c5	171	mutex_unlock(&hw->open_mutex);
8fa58af7 KW	172	wake_up(&hw->open_wait);
	173
	174	snd_card_file_remove(hw->card, file);
104326f8	175	module_put(mod);
1da177e4 LT	176	return err;
	177	}
	178
	179	static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
	180	{
d9a98de2	181	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	182	if (hw->ops.poll)
	183	return hw->ops.poll(hw, file, wait);
	184	return 0;
	185	}
	186
d9a98de2 TI	187	static int snd_hwdep_info(struct snd_hwdep *hw,
d9a98de2 TI	188	struct snd_hwdep_info __user *_info)
1da177e4	189	{
d9a98de2	190	struct snd_hwdep_info info;
1da177e4 LT	191
	192	memset(&info, 0, sizeof(info));
	193	info.card = hw->card->number;
	194	strlcpy(info.id, hw->id, sizeof(info.id));
	195	strlcpy(info.name, hw->name, sizeof(info.name));
	196	info.iface = hw->iface;
	197	if (copy_to_user(_info, &info, sizeof(info)))
	198	return -EFAULT;
	199	return 0;
	200	}
	201
d9a98de2 TI	202	static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
d9a98de2 TI	203	struct snd_hwdep_dsp_status __user *_info)
1da177e4	204	{
d9a98de2	205	struct snd_hwdep_dsp_status info;
1da177e4 LT	206	int err;
	207
	208	if (! hw->ops.dsp_status)
	209	return -ENXIO;
	210	memset(&info, 0, sizeof(info));
	211	info.dsp_loaded = hw->dsp_loaded;
	212	if ((err = hw->ops.dsp_status(hw, &info)) < 0)
	213	return err;
	214	if (copy_to_user(_info, &info, sizeof(info)))
	215	return -EFAULT;
	216	return 0;
	217	}
	218
d9a98de2 TI	219	static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
d9a98de2 TI	220	struct snd_hwdep_dsp_image __user *_info)
1da177e4	221	{
d9a98de2	222	struct snd_hwdep_dsp_image info;
1da177e4 LT	223	int err;
	224
	225	if (! hw->ops.dsp_load)
	226	return -ENXIO;
	227	memset(&info, 0, sizeof(info));
	228	if (copy_from_user(&info, _info, sizeof(info)))
	229	return -EFAULT;
	230	/* check whether the dsp was already loaded */
	231	if (hw->dsp_loaded & (1 << info.index))
	232	return -EBUSY;
	233	if (!access_ok(VERIFY_READ, info.image, info.length))
	234	return -EFAULT;
	235	err = hw->ops.dsp_load(hw, &info);
	236	if (err < 0)
	237	return err;
	238	hw->dsp_loaded \|= (1 << info.index);
	239	return 0;
	240	}
	241
d9a98de2 TI	242	static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
d9a98de2 TI	243	unsigned long arg)
1da177e4	244	{
d9a98de2	245	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	246	void __user argp = (void __user )arg;
	247	switch (cmd) {
	248	case SNDRV_HWDEP_IOCTL_PVERSION:
	249	return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
	250	case SNDRV_HWDEP_IOCTL_INFO:
	251	return snd_hwdep_info(hw, argp);
	252	case SNDRV_HWDEP_IOCTL_DSP_STATUS:
	253	return snd_hwdep_dsp_status(hw, argp);
	254	case SNDRV_HWDEP_IOCTL_DSP_LOAD:
	255	return snd_hwdep_dsp_load(hw, argp);
	256	}
	257	if (hw->ops.ioctl)
	258	return hw->ops.ioctl(hw, file, cmd, arg);
	259	return -ENOTTY;
	260	}
	261
	262	static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
	263	{
d9a98de2	264	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	265	if (hw->ops.mmap)
	266	return hw->ops.mmap(hw, file, vma);
	267	return -ENXIO;
	268	}
	269
d9a98de2 TI	270	static int snd_hwdep_control_ioctl(struct snd_card *card,
d9a98de2 TI	271	struct snd_ctl_file * control,
1da177e4 LT	272	unsigned int cmd, unsigned long arg)
1da177e4 LT	273	{
1da177e4 LT	274	switch (cmd) {
	275	case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
	276	{
	277	int device;
	278
	279	if (get_user(device, (int __user *)arg))
	280	return -EFAULT;
1a60d4c5	281	mutex_lock(&register_mutex);
f7b2bb85 DC	282
	283	if (device < 0)
	284	device = 0;
	285	else if (device < SNDRV_MINOR_HWDEPS)
	286	device++;
	287	else
	288	device = SNDRV_MINOR_HWDEPS;
	289
1da177e4	290	while (device < SNDRV_MINOR_HWDEPS) {
f87135f5	291	if (snd_hwdep_search(card, device))
1da177e4 LT	292	break;
	293	device++;
	294	}
	295	if (device >= SNDRV_MINOR_HWDEPS)
	296	device = -1;
1a60d4c5	297	mutex_unlock(&register_mutex);
1da177e4 LT	298	if (put_user(device, (int __user *)arg))
	299	return -EFAULT;
	300	return 0;
	301	}
	302	case SNDRV_CTL_IOCTL_HWDEP_INFO:
	303	{
d9a98de2	304	struct snd_hwdep_info __user info = (struct snd_hwdep_info __user )arg;
f87135f5	305	int device, err;
d9a98de2	306	struct snd_hwdep *hwdep;
1da177e4 LT	307
	308	if (get_user(device, &info->device))
	309	return -EFAULT;
1a60d4c5	310	mutex_lock(&register_mutex);
f87135f5 CL	311	hwdep = snd_hwdep_search(card, device);
	312	if (hwdep)
	313	err = snd_hwdep_info(hwdep, info);
	314	else
	315	err = -ENXIO;
1a60d4c5	316	mutex_unlock(&register_mutex);
f87135f5	317	return err;
1da177e4 LT	318	}
	319	}
	320	return -ENOIOCTLCMD;
	321	}
	322
	323	#ifdef CONFIG_COMPAT
	324	#include "hwdep_compat.c"
	325	#else
	326	#define snd_hwdep_ioctl_compat NULL
	327	#endif
	328
	329	/*
	330
	331	*/
	332
9c2e08c5	333	static const struct file_operations snd_hwdep_f_ops =
1da177e4 LT	334	{
	335	.owner = THIS_MODULE,
	336	.llseek = snd_hwdep_llseek,
	337	.read = snd_hwdep_read,
	338	.write = snd_hwdep_write,
	339	.open = snd_hwdep_open,
	340	.release = snd_hwdep_release,
	341	.poll = snd_hwdep_poll,
	342	.unlocked_ioctl = snd_hwdep_ioctl,
	343	.compat_ioctl = snd_hwdep_ioctl_compat,
	344	.mmap = snd_hwdep_mmap,
	345	};
	346
7b461600 TI	347	static void release_hwdep_device(struct device *dev)
	348	{
	349	kfree(container_of(dev, struct snd_hwdep, dev));
	350	}
	351
1da177e4 LT	352	/**
	353	* snd_hwdep_new - create a new hwdep instance
	354	* @card: the card instance
	355	* @id: the id string
	356	* @device: the device index (zero-based)
	357	* @rhwdep: the pointer to store the new hwdep instance
	358	*
	359	* Creates a new hwdep instance with the given index on the card.
	360	* The callbacks (hwdep->ops) must be set on the returned instance
	361	* after this call manually by the caller.
	362	*
eb7c06e8	363	* Return: Zero if successful, or a negative error code on failure.
1da177e4	364	*/
d9a98de2 TI	365	int snd_hwdep_new(struct snd_card card, char id, int device,
d9a98de2 TI	366	struct snd_hwdep **rhwdep)
1da177e4	367	{
d9a98de2	368	struct snd_hwdep *hwdep;
1da177e4	369	int err;
d9a98de2	370	static struct snd_device_ops ops = {
1da177e4 LT	371	.dev_free = snd_hwdep_dev_free,
1da177e4 LT	372	.dev_register = snd_hwdep_dev_register,
c461482c	373	.dev_disconnect = snd_hwdep_dev_disconnect,
1da177e4 LT	374	};
1da177e4 LT	375
7eaa943c TI	376	if (snd_BUG_ON(!card))
	377	return -ENXIO;
	378	if (rhwdep)
	379	*rhwdep = NULL;
ca2c0966	380	hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
73e77ba0	381	if (hwdep == NULL) {
2ebef69f	382	dev_err(card->dev, "hwdep: cannot allocate\n");
1da177e4	383	return -ENOMEM;
73e77ba0	384	}
7b461600 TI	385
	386	init_waitqueue_head(&hwdep->open_wait);
	387	mutex_init(&hwdep->open_mutex);
1da177e4 LT	388	hwdep->card = card;
1da177e4 LT	389	hwdep->device = device;
73e77ba0	390	if (id)
1da177e4	391	strlcpy(hwdep->id, id, sizeof(hwdep->id));
7b461600 TI	392
	393	snd_device_initialize(&hwdep->dev, card);
	394	hwdep->dev.release = release_hwdep_device;
	395	dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device);
1da177e4 LT	396	#ifdef CONFIG_SND_OSSEMUL
	397	hwdep->oss_type = -1;
	398	#endif
7b461600 TI	399
	400	err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops);
	401	if (err < 0) {
	402	put_device(&hwdep->dev);
1da177e4 LT	403	return err;
1da177e4 LT	404	}
7b461600	405
7eaa943c TI	406	if (rhwdep)
7eaa943c TI	407	*rhwdep = hwdep;
1da177e4 LT	408	return 0;
1da177e4 LT	409	}
6776a5d7	410	EXPORT_SYMBOL(snd_hwdep_new);
1da177e4	411
7b461600	412	static int snd_hwdep_dev_free(struct snd_device *device)
1da177e4	413	{
7b461600	414	struct snd_hwdep *hwdep = device->device_data;
7eaa943c TI	415	if (!hwdep)
7eaa943c TI	416	return 0;
1da177e4 LT	417	if (hwdep->private_free)
1da177e4 LT	418	hwdep->private_free(hwdep);
7b461600	419	put_device(&hwdep->dev);
1da177e4 LT	420	return 0;
	421	}
	422
d9a98de2	423	static int snd_hwdep_dev_register(struct snd_device *device)
1da177e4	424	{
d9a98de2	425	struct snd_hwdep *hwdep = device->device_data;
2ebef69f	426	struct snd_card *card = hwdep->card;
f87135f5	427	int err;
1da177e4	428
1a60d4c5	429	mutex_lock(&register_mutex);
2ebef69f	430	if (snd_hwdep_search(card, hwdep->device)) {
1a60d4c5	431	mutex_unlock(&register_mutex);
1da177e4 LT	432	return -EBUSY;
1da177e4 LT	433	}
f87135f5	434	list_add_tail(&hwdep->list, &snd_hwdep_devices);
40a4b263 TI	435	err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
	436	hwdep->card, hwdep->device,
	437	&snd_hwdep_f_ops, hwdep, &hwdep->dev);
71e2e1c1	438	if (err < 0) {
7b461600	439	dev_err(&hwdep->dev, "unable to register\n");
f87135f5	440	list_del(&hwdep->list);
1a60d4c5	441	mutex_unlock(&register_mutex);
1da177e4 LT	442	return err;
1da177e4 LT	443	}
caa751ba	444
1da177e4 LT	445	#ifdef CONFIG_SND_OSSEMUL
	446	hwdep->ossreg = 0;
	447	if (hwdep->oss_type >= 0) {
7b461600 TI	448	if (hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM &&
	449	hwdep->device)
	450	dev_warn(&hwdep->dev,
2ebef69f	451	"only hwdep device 0 can be registered as OSS direct FM device!\n");
7b461600 TI	452	else if (snd_register_oss_device(hwdep->oss_type,
	453	card, hwdep->device,
	454	&snd_hwdep_f_ops, hwdep) < 0)
	455	dev_warn(&hwdep->dev,
	456	"unable to register OSS compatibility device\n");
	457	else
	458	hwdep->ossreg = 1;
1da177e4 LT	459	}
1da177e4 LT	460	#endif
1a60d4c5	461	mutex_unlock(&register_mutex);
1da177e4 LT	462	return 0;
	463	}
	464
c461482c	465	static int snd_hwdep_dev_disconnect(struct snd_device *device)
1da177e4	466	{
d9a98de2	467	struct snd_hwdep *hwdep = device->device_data;
1da177e4	468
7eaa943c TI	469	if (snd_BUG_ON(!hwdep))
7eaa943c TI	470	return -ENXIO;
1a60d4c5	471	mutex_lock(&register_mutex);
f87135f5	472	if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
1a60d4c5	473	mutex_unlock(&register_mutex);
1da177e4 LT	474	return -EINVAL;
1da177e4 LT	475	}
0914f796 TI	476	mutex_lock(&hwdep->open_mutex);
0914f796 TI	477	wake_up(&hwdep->open_wait);
1da177e4 LT	478	#ifdef CONFIG_SND_OSSEMUL
	479	if (hwdep->ossreg)
	480	snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
	481	#endif
40a4b263	482	snd_unregister_device(&hwdep->dev);
c461482c	483	list_del_init(&hwdep->list);
0914f796	484	mutex_unlock(&hwdep->open_mutex);
1a60d4c5	485	mutex_unlock(&register_mutex);
c461482c	486	return 0;
1da177e4 LT	487	}
1da177e4 LT	488
e28563cc	489	#ifdef CONFIG_PROC_FS
1da177e4 LT	490	/*
	491	* Info interface
	492	*/
	493
d9a98de2 TI	494	static void snd_hwdep_proc_read(struct snd_info_entry *entry,
d9a98de2 TI	495	struct snd_info_buffer *buffer)
1da177e4	496	{
d9a98de2	497	struct snd_hwdep *hwdep;
1da177e4	498
1a60d4c5	499	mutex_lock(&register_mutex);
9244b2c3	500	list_for_each_entry(hwdep, &snd_hwdep_devices, list)
1da177e4	501	snd_iprintf(buffer, "%02i-%02i: %s\n",
f87135f5	502	hwdep->card->number, hwdep->device, hwdep->name);
1a60d4c5	503	mutex_unlock(&register_mutex);
1da177e4 LT	504	}
1da177e4 LT	505
e28563cc	506	static struct snd_info_entry *snd_hwdep_proc_entry;
1da177e4	507
e28563cc	508	static void __init snd_hwdep_proc_init(void)
1da177e4	509	{
d9a98de2	510	struct snd_info_entry *entry;
1da177e4	511
1da177e4	512	if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
1da177e4 LT	513	entry->c.text.read = snd_hwdep_proc_read;
	514	if (snd_info_register(entry) < 0) {
	515	snd_info_free_entry(entry);
	516	entry = NULL;
	517	}
	518	}
	519	snd_hwdep_proc_entry = entry;
e28563cc TI	520	}
	521
	522	static void __exit snd_hwdep_proc_done(void)
	523	{
746d4a02	524	snd_info_free_entry(snd_hwdep_proc_entry);
e28563cc TI	525	}
	526	#else /* !CONFIG_PROC_FS */
	527	#define snd_hwdep_proc_init()
	528	#define snd_hwdep_proc_done()
	529	#endif /* CONFIG_PROC_FS */
	530
	531
	532	/*
	533	* ENTRY functions
	534	*/
	535
	536	static int __init alsa_hwdep_init(void)
	537	{
	538	snd_hwdep_proc_init();
1da177e4 LT	539	snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
	540	snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
	541	return 0;
	542	}
	543
	544	static void __exit alsa_hwdep_exit(void)
	545	{
	546	snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
	547	snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
e28563cc	548	snd_hwdep_proc_done();
1da177e4 LT	549	}
	550
	551	module_init(alsa_hwdep_init)
	552	module_exit(alsa_hwdep_exit)