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

/*
 *  Hardware dependent layer
 *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
#include <linux/major.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/mutex.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@suse.cz>");
MODULE_DESCRIPTION("Hardware dependent layer");
MODULE_LICENSE("GPL");

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

static int snd_hwdep_free(struct snd_hwdep *hwdep);
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 list_head *p;
	struct snd_hwdep *hwdep;

	list_for_each(p, &snd_hwdep_devices) {
		hwdep = list_entry(p, struct snd_hwdep, 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 (!hw->ops.open)
		return -ENXIO;

	if (!try_module_get(hw->card->module))
		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;
		}
		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 (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);
	return err;
}

static int snd_hwdep_release(struct inode *inode, struct file * file)
{
	int err = -ENXIO;
	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);
		wake_up(&hw->open_wait);
	}
	if (hw->used > 0)
		hw->used--;
	snd_card_file_remove(hw->card, file);
	mutex_unlock(&hw->open_mutex);
	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);
			device = device < 0 ? 0 : device + 1;
			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 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,
};

/**
 * 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.
 *
 * Returns 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,
	};

	snd_assert(rhwdep != NULL, return -EINVAL);
	*rhwdep = NULL;
	snd_assert(card != NULL, return -ENXIO);
	hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
	if (hwdep == NULL) {
		snd_printk(KERN_ERR "hwdep: cannot allocate\n");
		return -ENOMEM;
	}
	hwdep->card = card;
	hwdep->device = device;
	if (id)
		strlcpy(hwdep->id, id, sizeof(hwdep->id));
#ifdef CONFIG_SND_OSSEMUL
	hwdep->oss_type = -1;
#endif
	if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
		snd_hwdep_free(hwdep);
		return err;
	}
	init_waitqueue_head(&hwdep->open_wait);
	mutex_init(&hwdep->open_mutex);
	*rhwdep = hwdep;
	return 0;
}

static int snd_hwdep_free(struct snd_hwdep *hwdep)
{
	snd_assert(hwdep != NULL, return -ENXIO);
	if (hwdep->private_free)
		hwdep->private_free(hwdep);
	kfree(hwdep);
	return 0;
}

static int snd_hwdep_dev_free(struct snd_device *device)
{
	struct snd_hwdep *hwdep = device->device_data;
	return snd_hwdep_free(hwdep);
}

static int snd_hwdep_dev_register(struct snd_device *device)
{
	struct snd_hwdep *hwdep = device->device_data;
	int err;
	char name[32];

	mutex_lock(&register_mutex);
	if (snd_hwdep_search(hwdep->card, hwdep->device)) {
		mutex_unlock(&register_mutex);
		return -EBUSY;
	}
	list_add_tail(&hwdep->list, &snd_hwdep_devices);
	sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
				       hwdep->card, hwdep->device,
				       &snd_hwdep_f_ops, hwdep, name)) < 0) {
		snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
			   hwdep->card->number, hwdep->device);
		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 != 0)) {
			snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
		} else {
			if (snd_register_oss_device(hwdep->oss_type,
						    hwdep->card, hwdep->device,
						    &snd_hwdep_f_ops, hwdep,
						    hwdep->oss_dev) < 0) {
				snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
					   hwdep->card->number, hwdep->device);
			} 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;

	snd_assert(hwdep != NULL, return -ENXIO);
	mutex_lock(&register_mutex);
	if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
		mutex_unlock(&register_mutex);
		return -EINVAL;
	}
#ifdef CONFIG_SND_OSSEMUL
	if (hwdep->ossreg)
		snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
#endif
	snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
	list_del_init(&hwdep->list);
	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 list_head *p;
	struct snd_hwdep *hwdep;

	mutex_lock(&register_mutex);
	list_for_each(p, &snd_hwdep_devices) {
		hwdep = list_entry(p, struct snd_hwdep, 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)

EXPORT_SYMBOL(snd_hwdep_new);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Hardware dependent layer
	3	* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
	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
	22	#include <sound/driver.h>
	23	#include <linux/major.h>
	24	#include <linux/init.h>
	25	#include <linux/smp_lock.h>
	26	#include <linux/slab.h>
	27	#include <linux/time.h>
1a60d4c5	28	#include <linux/mutex.h>
1da177e4 LT	29	#include <sound/core.h>
	30	#include <sound/control.h>
	31	#include <sound/minors.h>
	32	#include <sound/hwdep.h>
	33	#include <sound/info.h>
	34
	35	MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
	36	MODULE_DESCRIPTION("Hardware dependent layer");
	37	MODULE_LICENSE("GPL");
	38
f87135f5	39	static LIST_HEAD(snd_hwdep_devices);
1a60d4c5	40	static DEFINE_MUTEX(register_mutex);
1da177e4	41
d9a98de2 TI	42	static int snd_hwdep_free(struct snd_hwdep *hwdep);
	43	static int snd_hwdep_dev_free(struct snd_device *device);
	44	static int snd_hwdep_dev_register(struct snd_device *device);
c461482c	45	static int snd_hwdep_dev_disconnect(struct snd_device *device);
1da177e4	46
1da177e4	47
f87135f5 CL	48	static struct snd_hwdep snd_hwdep_search(struct snd_card card, int device)
	49	{
	50	struct list_head *p;
	51	struct snd_hwdep *hwdep;
	52
	53	list_for_each(p, &snd_hwdep_devices) {
	54	hwdep = list_entry(p, struct snd_hwdep, list);
	55	if (hwdep->card == card && hwdep->device == device)
	56	return hwdep;
	57	}
	58	return NULL;
	59	}
1da177e4 LT	60
	61	static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
	62	{
d9a98de2	63	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	64	if (hw->ops.llseek)
	65	return hw->ops.llseek(hw, file, offset, orig);
	66	return -ENXIO;
	67	}
	68
d9a98de2 TI	69	static ssize_t snd_hwdep_read(struct file * file, char __user *buf,
d9a98de2 TI	70	size_t count, loff_t *offset)
1da177e4	71	{
d9a98de2	72	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	73	if (hw->ops.read)
	74	return hw->ops.read(hw, buf, count, offset);
	75	return -ENXIO;
	76	}
	77
d9a98de2 TI	78	static ssize_t snd_hwdep_write(struct file * file, const char __user *buf,
d9a98de2 TI	79	size_t count, loff_t *offset)
1da177e4	80	{
d9a98de2	81	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	82	if (hw->ops.write)
	83	return hw->ops.write(hw, buf, count, offset);
	84	return -ENXIO;
	85	}
	86
	87	static int snd_hwdep_open(struct inode inode, struct file file)
	88	{
	89	int major = imajor(inode);
d9a98de2	90	struct snd_hwdep *hw;
1da177e4 LT	91	int err;
	92	wait_queue_t wait;
	93
f1902860	94	if (major == snd_major) {
f87135f5 CL	95	hw = snd_lookup_minor_data(iminor(inode),
f87135f5 CL	96	SNDRV_DEVICE_TYPE_HWDEP);
1da177e4	97	#ifdef CONFIG_SND_OSSEMUL
f1902860	98	} else if (major == SOUND_MAJOR) {
f87135f5 CL	99	hw = snd_lookup_oss_minor_data(iminor(inode),
f87135f5 CL	100	SNDRV_OSS_DEVICE_TYPE_DMFM);
1da177e4	101	#endif
f1902860	102	} else
1da177e4	103	return -ENXIO;
1da177e4 LT	104	if (hw == NULL)
	105	return -ENODEV;
	106
	107	if (!hw->ops.open)
	108	return -ENXIO;
1da177e4 LT	109
	110	if (!try_module_get(hw->card->module))
	111	return -EFAULT;
	112
	113	init_waitqueue_entry(&wait, current);
	114	add_wait_queue(&hw->open_wait, &wait);
1a60d4c5	115	mutex_lock(&hw->open_mutex);
1da177e4 LT	116	while (1) {
	117	if (hw->exclusive && hw->used > 0) {
	118	err = -EBUSY;
	119	break;
	120	}
	121	err = hw->ops.open(hw, file);
	122	if (err >= 0)
	123	break;
	124	if (err == -EAGAIN) {
	125	if (file->f_flags & O_NONBLOCK) {
	126	err = -EBUSY;
	127	break;
	128	}
	129	} else
	130	break;
	131	set_current_state(TASK_INTERRUPTIBLE);
1a60d4c5	132	mutex_unlock(&hw->open_mutex);
1da177e4	133	schedule();
1a60d4c5	134	mutex_lock(&hw->open_mutex);
1da177e4 LT	135	if (signal_pending(current)) {
	136	err = -ERESTARTSYS;
	137	break;
	138	}
	139	}
	140	remove_wait_queue(&hw->open_wait, &wait);
	141	if (err >= 0) {
	142	err = snd_card_file_add(hw->card, file);
	143	if (err >= 0) {
	144	file->private_data = hw;
	145	hw->used++;
	146	} else {
	147	if (hw->ops.release)
	148	hw->ops.release(hw, file);
	149	}
	150	}
1a60d4c5	151	mutex_unlock(&hw->open_mutex);
1da177e4 LT	152	if (err < 0)
	153	module_put(hw->card->module);
	154	return err;
	155	}
	156
	157	static int snd_hwdep_release(struct inode inode, struct file file)
	158	{
	159	int err = -ENXIO;
d9a98de2	160	struct snd_hwdep *hw = file->private_data;
104326f8	161	struct module *mod = hw->card->module;
1a60d4c5	162	mutex_lock(&hw->open_mutex);
1da177e4 LT	163	if (hw->ops.release) {
	164	err = hw->ops.release(hw, file);
	165	wake_up(&hw->open_wait);
	166	}
	167	if (hw->used > 0)
	168	hw->used--;
	169	snd_card_file_remove(hw->card, file);
1a60d4c5	170	mutex_unlock(&hw->open_mutex);
104326f8	171	module_put(mod);
1da177e4 LT	172	return err;
	173	}
	174
	175	static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
	176	{
d9a98de2	177	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	178	if (hw->ops.poll)
	179	return hw->ops.poll(hw, file, wait);
	180	return 0;
	181	}
	182
d9a98de2 TI	183	static int snd_hwdep_info(struct snd_hwdep *hw,
d9a98de2 TI	184	struct snd_hwdep_info __user *_info)
1da177e4	185	{
d9a98de2	186	struct snd_hwdep_info info;
1da177e4 LT	187
	188	memset(&info, 0, sizeof(info));
	189	info.card = hw->card->number;
	190	strlcpy(info.id, hw->id, sizeof(info.id));
	191	strlcpy(info.name, hw->name, sizeof(info.name));
	192	info.iface = hw->iface;
	193	if (copy_to_user(_info, &info, sizeof(info)))
	194	return -EFAULT;
	195	return 0;
	196	}
	197
d9a98de2 TI	198	static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
d9a98de2 TI	199	struct snd_hwdep_dsp_status __user *_info)
1da177e4	200	{
d9a98de2	201	struct snd_hwdep_dsp_status info;
1da177e4 LT	202	int err;
	203
	204	if (! hw->ops.dsp_status)
	205	return -ENXIO;
	206	memset(&info, 0, sizeof(info));
	207	info.dsp_loaded = hw->dsp_loaded;
	208	if ((err = hw->ops.dsp_status(hw, &info)) < 0)
	209	return err;
	210	if (copy_to_user(_info, &info, sizeof(info)))
	211	return -EFAULT;
	212	return 0;
	213	}
	214
d9a98de2 TI	215	static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
d9a98de2 TI	216	struct snd_hwdep_dsp_image __user *_info)
1da177e4	217	{
d9a98de2	218	struct snd_hwdep_dsp_image info;
1da177e4 LT	219	int err;
	220
	221	if (! hw->ops.dsp_load)
	222	return -ENXIO;
	223	memset(&info, 0, sizeof(info));
	224	if (copy_from_user(&info, _info, sizeof(info)))
	225	return -EFAULT;
	226	/* check whether the dsp was already loaded */
	227	if (hw->dsp_loaded & (1 << info.index))
	228	return -EBUSY;
	229	if (!access_ok(VERIFY_READ, info.image, info.length))
	230	return -EFAULT;
	231	err = hw->ops.dsp_load(hw, &info);
	232	if (err < 0)
	233	return err;
	234	hw->dsp_loaded \|= (1 << info.index);
	235	return 0;
	236	}
	237
d9a98de2 TI	238	static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
d9a98de2 TI	239	unsigned long arg)
1da177e4	240	{
d9a98de2	241	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	242	void __user argp = (void __user )arg;
	243	switch (cmd) {
	244	case SNDRV_HWDEP_IOCTL_PVERSION:
	245	return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
	246	case SNDRV_HWDEP_IOCTL_INFO:
	247	return snd_hwdep_info(hw, argp);
	248	case SNDRV_HWDEP_IOCTL_DSP_STATUS:
	249	return snd_hwdep_dsp_status(hw, argp);
	250	case SNDRV_HWDEP_IOCTL_DSP_LOAD:
	251	return snd_hwdep_dsp_load(hw, argp);
	252	}
	253	if (hw->ops.ioctl)
	254	return hw->ops.ioctl(hw, file, cmd, arg);
	255	return -ENOTTY;
	256	}
	257
	258	static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
	259	{
d9a98de2	260	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	261	if (hw->ops.mmap)
	262	return hw->ops.mmap(hw, file, vma);
	263	return -ENXIO;
	264	}
	265
d9a98de2 TI	266	static int snd_hwdep_control_ioctl(struct snd_card *card,
d9a98de2 TI	267	struct snd_ctl_file * control,
1da177e4 LT	268	unsigned int cmd, unsigned long arg)
1da177e4 LT	269	{
1da177e4 LT	270	switch (cmd) {
	271	case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
	272	{
	273	int device;
	274
	275	if (get_user(device, (int __user *)arg))
	276	return -EFAULT;
1a60d4c5	277	mutex_lock(&register_mutex);
1da177e4 LT	278	device = device < 0 ? 0 : device + 1;
1da177e4 LT	279	while (device < SNDRV_MINOR_HWDEPS) {
f87135f5	280	if (snd_hwdep_search(card, device))
1da177e4 LT	281	break;
	282	device++;
	283	}
	284	if (device >= SNDRV_MINOR_HWDEPS)
	285	device = -1;
1a60d4c5	286	mutex_unlock(&register_mutex);
1da177e4 LT	287	if (put_user(device, (int __user *)arg))
	288	return -EFAULT;
	289	return 0;
	290	}
	291	case SNDRV_CTL_IOCTL_HWDEP_INFO:
	292	{
d9a98de2	293	struct snd_hwdep_info __user info = (struct snd_hwdep_info __user )arg;
f87135f5	294	int device, err;
d9a98de2	295	struct snd_hwdep *hwdep;
1da177e4 LT	296
	297	if (get_user(device, &info->device))
	298	return -EFAULT;
1a60d4c5	299	mutex_lock(&register_mutex);
f87135f5 CL	300	hwdep = snd_hwdep_search(card, device);
	301	if (hwdep)
	302	err = snd_hwdep_info(hwdep, info);
	303	else
	304	err = -ENXIO;
1a60d4c5	305	mutex_unlock(&register_mutex);
f87135f5	306	return err;
1da177e4 LT	307	}
	308	}
	309	return -ENOIOCTLCMD;
	310	}
	311
	312	#ifdef CONFIG_COMPAT
	313	#include "hwdep_compat.c"
	314	#else
	315	#define snd_hwdep_ioctl_compat NULL
	316	#endif
	317
	318	/*
	319
	320	*/
	321
	322	static struct file_operations snd_hwdep_f_ops =
	323	{
	324	.owner = THIS_MODULE,
	325	.llseek = snd_hwdep_llseek,
	326	.read = snd_hwdep_read,
	327	.write = snd_hwdep_write,
	328	.open = snd_hwdep_open,
	329	.release = snd_hwdep_release,
	330	.poll = snd_hwdep_poll,
	331	.unlocked_ioctl = snd_hwdep_ioctl,
	332	.compat_ioctl = snd_hwdep_ioctl_compat,
	333	.mmap = snd_hwdep_mmap,
	334	};
	335
1da177e4 LT	336	/**
	337	* snd_hwdep_new - create a new hwdep instance
	338	* @card: the card instance
	339	* @id: the id string
	340	* @device: the device index (zero-based)
	341	* @rhwdep: the pointer to store the new hwdep instance
	342	*
	343	* Creates a new hwdep instance with the given index on the card.
	344	* The callbacks (hwdep->ops) must be set on the returned instance
	345	* after this call manually by the caller.
	346	*
	347	* Returns zero if successful, or a negative error code on failure.
	348	*/
d9a98de2 TI	349	int snd_hwdep_new(struct snd_card card, char id, int device,
d9a98de2 TI	350	struct snd_hwdep **rhwdep)
1da177e4	351	{
d9a98de2	352	struct snd_hwdep *hwdep;
1da177e4	353	int err;
d9a98de2	354	static struct snd_device_ops ops = {
1da177e4 LT	355	.dev_free = snd_hwdep_dev_free,
1da177e4 LT	356	.dev_register = snd_hwdep_dev_register,
c461482c	357	.dev_disconnect = snd_hwdep_dev_disconnect,
1da177e4 LT	358	};
	359
	360	snd_assert(rhwdep != NULL, return -EINVAL);
	361	*rhwdep = NULL;
	362	snd_assert(card != NULL, return -ENXIO);
ca2c0966	363	hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
73e77ba0 TI	364	if (hwdep == NULL) {
73e77ba0 TI	365	snd_printk(KERN_ERR "hwdep: cannot allocate\n");
1da177e4	366	return -ENOMEM;
73e77ba0	367	}
1da177e4 LT	368	hwdep->card = card;
1da177e4 LT	369	hwdep->device = device;
73e77ba0	370	if (id)
1da177e4	371	strlcpy(hwdep->id, id, sizeof(hwdep->id));
1da177e4 LT	372	#ifdef CONFIG_SND_OSSEMUL
	373	hwdep->oss_type = -1;
	374	#endif
	375	if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
	376	snd_hwdep_free(hwdep);
	377	return err;
	378	}
	379	init_waitqueue_head(&hwdep->open_wait);
1a60d4c5	380	mutex_init(&hwdep->open_mutex);
1da177e4 LT	381	*rhwdep = hwdep;
	382	return 0;
	383	}
	384
d9a98de2	385	static int snd_hwdep_free(struct snd_hwdep *hwdep)
1da177e4 LT	386	{
	387	snd_assert(hwdep != NULL, return -ENXIO);
	388	if (hwdep->private_free)
	389	hwdep->private_free(hwdep);
	390	kfree(hwdep);
	391	return 0;
	392	}
	393
d9a98de2	394	static int snd_hwdep_dev_free(struct snd_device *device)
1da177e4	395	{
d9a98de2	396	struct snd_hwdep *hwdep = device->device_data;
1da177e4 LT	397	return snd_hwdep_free(hwdep);
	398	}
	399
d9a98de2	400	static int snd_hwdep_dev_register(struct snd_device *device)
1da177e4	401	{
d9a98de2	402	struct snd_hwdep *hwdep = device->device_data;
f87135f5	403	int err;
1da177e4 LT	404	char name[32];
1da177e4 LT	405
1a60d4c5	406	mutex_lock(&register_mutex);
f87135f5	407	if (snd_hwdep_search(hwdep->card, hwdep->device)) {
1a60d4c5	408	mutex_unlock(&register_mutex);
1da177e4 LT	409	return -EBUSY;
1da177e4 LT	410	}
f87135f5	411	list_add_tail(&hwdep->list, &snd_hwdep_devices);
1da177e4 LT	412	sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
	413	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
	414	hwdep->card, hwdep->device,
f87135f5	415	&snd_hwdep_f_ops, hwdep, name)) < 0) {
1da177e4 LT	416	snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
1da177e4 LT	417	hwdep->card->number, hwdep->device);
f87135f5	418	list_del(&hwdep->list);
1a60d4c5	419	mutex_unlock(&register_mutex);
1da177e4 LT	420	return err;
	421	}
	422	#ifdef CONFIG_SND_OSSEMUL
	423	hwdep->ossreg = 0;
	424	if (hwdep->oss_type >= 0) {
	425	if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
	426	snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
	427	} else {
	428	if (snd_register_oss_device(hwdep->oss_type,
	429	hwdep->card, hwdep->device,
f87135f5	430	&snd_hwdep_f_ops, hwdep,
2af677fc	431	hwdep->oss_dev) < 0) {
1da177e4 LT	432	snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
	433	hwdep->card->number, hwdep->device);
	434	} else
	435	hwdep->ossreg = 1;
	436	}
	437	}
	438	#endif
1a60d4c5	439	mutex_unlock(&register_mutex);
1da177e4 LT	440	return 0;
	441	}
	442
c461482c	443	static int snd_hwdep_dev_disconnect(struct snd_device *device)
1da177e4	444	{
d9a98de2	445	struct snd_hwdep *hwdep = device->device_data;
1da177e4 LT	446
1da177e4 LT	447	snd_assert(hwdep != NULL, return -ENXIO);
1a60d4c5	448	mutex_lock(&register_mutex);
f87135f5	449	if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
1a60d4c5	450	mutex_unlock(&register_mutex);
1da177e4 LT	451	return -EINVAL;
	452	}
	453	#ifdef CONFIG_SND_OSSEMUL
	454	if (hwdep->ossreg)
	455	snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
	456	#endif
	457	snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
c461482c	458	list_del_init(&hwdep->list);
1a60d4c5	459	mutex_unlock(&register_mutex);
c461482c	460	return 0;
1da177e4 LT	461	}
1da177e4 LT	462
e28563cc	463	#ifdef CONFIG_PROC_FS
1da177e4 LT	464	/*
	465	* Info interface
	466	*/
	467
d9a98de2 TI	468	static void snd_hwdep_proc_read(struct snd_info_entry *entry,
d9a98de2 TI	469	struct snd_info_buffer *buffer)
1da177e4	470	{
f87135f5	471	struct list_head *p;
d9a98de2	472	struct snd_hwdep *hwdep;
1da177e4	473
1a60d4c5	474	mutex_lock(&register_mutex);
f87135f5 CL	475	list_for_each(p, &snd_hwdep_devices) {
f87135f5 CL	476	hwdep = list_entry(p, struct snd_hwdep, list);
1da177e4	477	snd_iprintf(buffer, "%02i-%02i: %s\n",
f87135f5	478	hwdep->card->number, hwdep->device, hwdep->name);
1da177e4	479	}
1a60d4c5	480	mutex_unlock(&register_mutex);
1da177e4 LT	481	}
1da177e4 LT	482
e28563cc	483	static struct snd_info_entry *snd_hwdep_proc_entry;
1da177e4	484
e28563cc	485	static void __init snd_hwdep_proc_init(void)
1da177e4	486	{
d9a98de2	487	struct snd_info_entry *entry;
1da177e4	488
1da177e4	489	if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
1da177e4 LT	490	entry->c.text.read = snd_hwdep_proc_read;
	491	if (snd_info_register(entry) < 0) {
	492	snd_info_free_entry(entry);
	493	entry = NULL;
	494	}
	495	}
	496	snd_hwdep_proc_entry = entry;
e28563cc TI	497	}
	498
	499	static void __exit snd_hwdep_proc_done(void)
	500	{
746d4a02	501	snd_info_free_entry(snd_hwdep_proc_entry);
e28563cc TI	502	}
	503	#else /* !CONFIG_PROC_FS */
	504	#define snd_hwdep_proc_init()
	505	#define snd_hwdep_proc_done()
	506	#endif /* CONFIG_PROC_FS */
	507
	508
	509	/*
	510	* ENTRY functions
	511	*/
	512
	513	static int __init alsa_hwdep_init(void)
	514	{
	515	snd_hwdep_proc_init();
1da177e4 LT	516	snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
	517	snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
	518	return 0;
	519	}
	520
	521	static void __exit alsa_hwdep_exit(void)
	522	{
	523	snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
	524	snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
e28563cc	525	snd_hwdep_proc_done();
1da177e4 LT	526	}
	527
	528	module_init(alsa_hwdep_init)
	529	module_exit(alsa_hwdep_exit)
	530
	531	EXPORT_SYMBOL(snd_hwdep_new);