[GitHub/mt8127/android_kernel_alcatel_ttab.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 <sound/driver.h>
#include <linux/major.h>
#include <linux/init.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@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_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 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 (!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);
	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);
			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 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,
};

/**
 * 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 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)

EXPORT_SYMBOL(snd_hwdep_new);
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
	22	#include <sound/driver.h>
	23	#include <linux/major.h>
	24	#include <linux/init.h>
1da177e4 LT	25	#include <linux/slab.h>
1da177e4 LT	26	#include <linux/time.h>
1a60d4c5	27	#include <linux/mutex.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_free(struct snd_hwdep *hwdep);
	42	static int snd_hwdep_dev_free(struct snd_device *device);
	43	static int snd_hwdep_dev_register(struct snd_device *device);
c461482c	44	static int snd_hwdep_dev_disconnect(struct snd_device *device);
1da177e4	45
1da177e4	46
f87135f5 CL	47	static struct snd_hwdep snd_hwdep_search(struct snd_card card, int device)
f87135f5 CL	48	{
f87135f5 CL	49	struct snd_hwdep *hwdep;
f87135f5 CL	50
9244b2c3	51	list_for_each_entry(hwdep, &snd_hwdep_devices, list)
f87135f5 CL	52	if (hwdep->card == card && hwdep->device == device)
f87135f5 CL	53	return hwdep;
f87135f5 CL	54	return NULL;
f87135f5 CL	55	}
1da177e4 LT	56
	57	static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
	58	{
d9a98de2	59	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	60	if (hw->ops.llseek)
	61	return hw->ops.llseek(hw, file, offset, orig);
	62	return -ENXIO;
	63	}
	64
d9a98de2 TI	65	static ssize_t snd_hwdep_read(struct file * file, char __user *buf,
d9a98de2 TI	66	size_t count, loff_t *offset)
1da177e4	67	{
d9a98de2	68	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	69	if (hw->ops.read)
	70	return hw->ops.read(hw, buf, count, offset);
	71	return -ENXIO;
	72	}
	73
d9a98de2 TI	74	static ssize_t snd_hwdep_write(struct file * file, const char __user *buf,
d9a98de2 TI	75	size_t count, loff_t *offset)
1da177e4	76	{
d9a98de2	77	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	78	if (hw->ops.write)
	79	return hw->ops.write(hw, buf, count, offset);
	80	return -ENXIO;
	81	}
	82
	83	static int snd_hwdep_open(struct inode inode, struct file file)
	84	{
	85	int major = imajor(inode);
d9a98de2	86	struct snd_hwdep *hw;
1da177e4 LT	87	int err;
	88	wait_queue_t wait;
	89
f1902860	90	if (major == snd_major) {
f87135f5 CL	91	hw = snd_lookup_minor_data(iminor(inode),
f87135f5 CL	92	SNDRV_DEVICE_TYPE_HWDEP);
1da177e4	93	#ifdef CONFIG_SND_OSSEMUL
f1902860	94	} else if (major == SOUND_MAJOR) {
f87135f5 CL	95	hw = snd_lookup_oss_minor_data(iminor(inode),
f87135f5 CL	96	SNDRV_OSS_DEVICE_TYPE_DMFM);
1da177e4	97	#endif
f1902860	98	} else
1da177e4	99	return -ENXIO;
1da177e4 LT	100	if (hw == NULL)
	101	return -ENODEV;
	102
	103	if (!hw->ops.open)
	104	return -ENXIO;
1da177e4 LT	105
	106	if (!try_module_get(hw->card->module))
	107	return -EFAULT;
	108
	109	init_waitqueue_entry(&wait, current);
	110	add_wait_queue(&hw->open_wait, &wait);
1a60d4c5	111	mutex_lock(&hw->open_mutex);
1da177e4 LT	112	while (1) {
	113	if (hw->exclusive && hw->used > 0) {
	114	err = -EBUSY;
	115	break;
	116	}
	117	err = hw->ops.open(hw, file);
	118	if (err >= 0)
	119	break;
	120	if (err == -EAGAIN) {
	121	if (file->f_flags & O_NONBLOCK) {
	122	err = -EBUSY;
	123	break;
	124	}
	125	} else
	126	break;
	127	set_current_state(TASK_INTERRUPTIBLE);
1a60d4c5	128	mutex_unlock(&hw->open_mutex);
1da177e4	129	schedule();
1a60d4c5	130	mutex_lock(&hw->open_mutex);
1da177e4 LT	131	if (signal_pending(current)) {
	132	err = -ERESTARTSYS;
	133	break;
	134	}
	135	}
	136	remove_wait_queue(&hw->open_wait, &wait);
	137	if (err >= 0) {
	138	err = snd_card_file_add(hw->card, file);
	139	if (err >= 0) {
	140	file->private_data = hw;
	141	hw->used++;
	142	} else {
	143	if (hw->ops.release)
	144	hw->ops.release(hw, file);
	145	}
	146	}
1a60d4c5	147	mutex_unlock(&hw->open_mutex);
1da177e4 LT	148	if (err < 0)
	149	module_put(hw->card->module);
	150	return err;
	151	}
	152
	153	static int snd_hwdep_release(struct inode inode, struct file file)
	154	{
	155	int err = -ENXIO;
d9a98de2	156	struct snd_hwdep *hw = file->private_data;
104326f8	157	struct module *mod = hw->card->module;
8fa58af7	158
1a60d4c5	159	mutex_lock(&hw->open_mutex);
8fa58af7	160	if (hw->ops.release)
1da177e4	161	err = hw->ops.release(hw, file);
1da177e4 LT	162	if (hw->used > 0)
1da177e4 LT	163	hw->used--;
1a60d4c5	164	mutex_unlock(&hw->open_mutex);
8fa58af7 KW	165	wake_up(&hw->open_wait);
	166
	167	snd_card_file_remove(hw->card, file);
104326f8	168	module_put(mod);
1da177e4 LT	169	return err;
	170	}
	171
	172	static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
	173	{
d9a98de2	174	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	175	if (hw->ops.poll)
	176	return hw->ops.poll(hw, file, wait);
	177	return 0;
	178	}
	179
d9a98de2 TI	180	static int snd_hwdep_info(struct snd_hwdep *hw,
d9a98de2 TI	181	struct snd_hwdep_info __user *_info)
1da177e4	182	{
d9a98de2	183	struct snd_hwdep_info info;
1da177e4 LT	184
	185	memset(&info, 0, sizeof(info));
	186	info.card = hw->card->number;
	187	strlcpy(info.id, hw->id, sizeof(info.id));
	188	strlcpy(info.name, hw->name, sizeof(info.name));
	189	info.iface = hw->iface;
	190	if (copy_to_user(_info, &info, sizeof(info)))
	191	return -EFAULT;
	192	return 0;
	193	}
	194
d9a98de2 TI	195	static int snd_hwdep_dsp_status(struct snd_hwdep *hw,
d9a98de2 TI	196	struct snd_hwdep_dsp_status __user *_info)
1da177e4	197	{
d9a98de2	198	struct snd_hwdep_dsp_status info;
1da177e4 LT	199	int err;
	200
	201	if (! hw->ops.dsp_status)
	202	return -ENXIO;
	203	memset(&info, 0, sizeof(info));
	204	info.dsp_loaded = hw->dsp_loaded;
	205	if ((err = hw->ops.dsp_status(hw, &info)) < 0)
	206	return err;
	207	if (copy_to_user(_info, &info, sizeof(info)))
	208	return -EFAULT;
	209	return 0;
	210	}
	211
d9a98de2 TI	212	static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
d9a98de2 TI	213	struct snd_hwdep_dsp_image __user *_info)
1da177e4	214	{
d9a98de2	215	struct snd_hwdep_dsp_image info;
1da177e4 LT	216	int err;
	217
	218	if (! hw->ops.dsp_load)
	219	return -ENXIO;
	220	memset(&info, 0, sizeof(info));
	221	if (copy_from_user(&info, _info, sizeof(info)))
	222	return -EFAULT;
	223	/* check whether the dsp was already loaded */
	224	if (hw->dsp_loaded & (1 << info.index))
	225	return -EBUSY;
	226	if (!access_ok(VERIFY_READ, info.image, info.length))
	227	return -EFAULT;
	228	err = hw->ops.dsp_load(hw, &info);
	229	if (err < 0)
	230	return err;
	231	hw->dsp_loaded \|= (1 << info.index);
	232	return 0;
	233	}
	234
d9a98de2 TI	235	static long snd_hwdep_ioctl(struct file * file, unsigned int cmd,
d9a98de2 TI	236	unsigned long arg)
1da177e4	237	{
d9a98de2	238	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	239	void __user argp = (void __user )arg;
	240	switch (cmd) {
	241	case SNDRV_HWDEP_IOCTL_PVERSION:
	242	return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
	243	case SNDRV_HWDEP_IOCTL_INFO:
	244	return snd_hwdep_info(hw, argp);
	245	case SNDRV_HWDEP_IOCTL_DSP_STATUS:
	246	return snd_hwdep_dsp_status(hw, argp);
	247	case SNDRV_HWDEP_IOCTL_DSP_LOAD:
	248	return snd_hwdep_dsp_load(hw, argp);
	249	}
	250	if (hw->ops.ioctl)
	251	return hw->ops.ioctl(hw, file, cmd, arg);
	252	return -ENOTTY;
	253	}
	254
	255	static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
	256	{
d9a98de2	257	struct snd_hwdep *hw = file->private_data;
1da177e4 LT	258	if (hw->ops.mmap)
	259	return hw->ops.mmap(hw, file, vma);
	260	return -ENXIO;
	261	}
	262
d9a98de2 TI	263	static int snd_hwdep_control_ioctl(struct snd_card *card,
d9a98de2 TI	264	struct snd_ctl_file * control,
1da177e4 LT	265	unsigned int cmd, unsigned long arg)
1da177e4 LT	266	{
1da177e4 LT	267	switch (cmd) {
	268	case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
	269	{
	270	int device;
	271
	272	if (get_user(device, (int __user *)arg))
	273	return -EFAULT;
1a60d4c5	274	mutex_lock(&register_mutex);
1da177e4 LT	275	device = device < 0 ? 0 : device + 1;
1da177e4 LT	276	while (device < SNDRV_MINOR_HWDEPS) {
f87135f5	277	if (snd_hwdep_search(card, device))
1da177e4 LT	278	break;
	279	device++;
	280	}
	281	if (device >= SNDRV_MINOR_HWDEPS)
	282	device = -1;
1a60d4c5	283	mutex_unlock(&register_mutex);
1da177e4 LT	284	if (put_user(device, (int __user *)arg))
	285	return -EFAULT;
	286	return 0;
	287	}
	288	case SNDRV_CTL_IOCTL_HWDEP_INFO:
	289	{
d9a98de2	290	struct snd_hwdep_info __user info = (struct snd_hwdep_info __user )arg;
f87135f5	291	int device, err;
d9a98de2	292	struct snd_hwdep *hwdep;
1da177e4 LT	293
	294	if (get_user(device, &info->device))
	295	return -EFAULT;
1a60d4c5	296	mutex_lock(&register_mutex);
f87135f5 CL	297	hwdep = snd_hwdep_search(card, device);
	298	if (hwdep)
	299	err = snd_hwdep_info(hwdep, info);
	300	else
	301	err = -ENXIO;
1a60d4c5	302	mutex_unlock(&register_mutex);
f87135f5	303	return err;
1da177e4 LT	304	}
	305	}
	306	return -ENOIOCTLCMD;
	307	}
	308
	309	#ifdef CONFIG_COMPAT
	310	#include "hwdep_compat.c"
	311	#else
	312	#define snd_hwdep_ioctl_compat NULL
	313	#endif
	314
	315	/*
	316
	317	*/
	318
9c2e08c5	319	static const struct file_operations snd_hwdep_f_ops =
1da177e4 LT	320	{
	321	.owner = THIS_MODULE,
	322	.llseek = snd_hwdep_llseek,
	323	.read = snd_hwdep_read,
	324	.write = snd_hwdep_write,
	325	.open = snd_hwdep_open,
	326	.release = snd_hwdep_release,
	327	.poll = snd_hwdep_poll,
	328	.unlocked_ioctl = snd_hwdep_ioctl,
	329	.compat_ioctl = snd_hwdep_ioctl_compat,
	330	.mmap = snd_hwdep_mmap,
	331	};
	332
1da177e4 LT	333	/**
	334	* snd_hwdep_new - create a new hwdep instance
	335	* @card: the card instance
	336	* @id: the id string
	337	* @device: the device index (zero-based)
	338	* @rhwdep: the pointer to store the new hwdep instance
	339	*
	340	* Creates a new hwdep instance with the given index on the card.
	341	* The callbacks (hwdep->ops) must be set on the returned instance
	342	* after this call manually by the caller.
	343	*
	344	* Returns zero if successful, or a negative error code on failure.
	345	*/
d9a98de2 TI	346	int snd_hwdep_new(struct snd_card card, char id, int device,
d9a98de2 TI	347	struct snd_hwdep **rhwdep)
1da177e4	348	{
d9a98de2	349	struct snd_hwdep *hwdep;
1da177e4	350	int err;
d9a98de2	351	static struct snd_device_ops ops = {
1da177e4 LT	352	.dev_free = snd_hwdep_dev_free,
1da177e4 LT	353	.dev_register = snd_hwdep_dev_register,
c461482c	354	.dev_disconnect = snd_hwdep_dev_disconnect,
1da177e4 LT	355	};
	356
	357	snd_assert(rhwdep != NULL, return -EINVAL);
	358	*rhwdep = NULL;
	359	snd_assert(card != NULL, return -ENXIO);
ca2c0966	360	hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
73e77ba0 TI	361	if (hwdep == NULL) {
73e77ba0 TI	362	snd_printk(KERN_ERR "hwdep: cannot allocate\n");
1da177e4	363	return -ENOMEM;
73e77ba0	364	}
1da177e4 LT	365	hwdep->card = card;
1da177e4 LT	366	hwdep->device = device;
73e77ba0	367	if (id)
1da177e4	368	strlcpy(hwdep->id, id, sizeof(hwdep->id));
1da177e4 LT	369	#ifdef CONFIG_SND_OSSEMUL
	370	hwdep->oss_type = -1;
	371	#endif
	372	if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
	373	snd_hwdep_free(hwdep);
	374	return err;
	375	}
	376	init_waitqueue_head(&hwdep->open_wait);
1a60d4c5	377	mutex_init(&hwdep->open_mutex);
1da177e4 LT	378	*rhwdep = hwdep;
	379	return 0;
	380	}
	381
d9a98de2	382	static int snd_hwdep_free(struct snd_hwdep *hwdep)
1da177e4 LT	383	{
	384	snd_assert(hwdep != NULL, return -ENXIO);
	385	if (hwdep->private_free)
	386	hwdep->private_free(hwdep);
	387	kfree(hwdep);
	388	return 0;
	389	}
	390
d9a98de2	391	static int snd_hwdep_dev_free(struct snd_device *device)
1da177e4	392	{
d9a98de2	393	struct snd_hwdep *hwdep = device->device_data;
1da177e4 LT	394	return snd_hwdep_free(hwdep);
	395	}
	396
d9a98de2	397	static int snd_hwdep_dev_register(struct snd_device *device)
1da177e4	398	{
d9a98de2	399	struct snd_hwdep *hwdep = device->device_data;
f87135f5	400	int err;
1da177e4 LT	401	char name[32];
1da177e4 LT	402
1a60d4c5	403	mutex_lock(&register_mutex);
f87135f5	404	if (snd_hwdep_search(hwdep->card, hwdep->device)) {
1a60d4c5	405	mutex_unlock(&register_mutex);
1da177e4 LT	406	return -EBUSY;
1da177e4 LT	407	}
f87135f5	408	list_add_tail(&hwdep->list, &snd_hwdep_devices);
1da177e4 LT	409	sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
	410	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
	411	hwdep->card, hwdep->device,
f87135f5	412	&snd_hwdep_f_ops, hwdep, name)) < 0) {
1da177e4 LT	413	snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
1da177e4 LT	414	hwdep->card->number, hwdep->device);
f87135f5	415	list_del(&hwdep->list);
1a60d4c5	416	mutex_unlock(&register_mutex);
1da177e4 LT	417	return err;
	418	}
	419	#ifdef CONFIG_SND_OSSEMUL
	420	hwdep->ossreg = 0;
	421	if (hwdep->oss_type >= 0) {
	422	if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
	423	snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
	424	} else {
	425	if (snd_register_oss_device(hwdep->oss_type,
	426	hwdep->card, hwdep->device,
f87135f5	427	&snd_hwdep_f_ops, hwdep,
2af677fc	428	hwdep->oss_dev) < 0) {
1da177e4 LT	429	snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
	430	hwdep->card->number, hwdep->device);
	431	} else
	432	hwdep->ossreg = 1;
	433	}
	434	}
	435	#endif
1a60d4c5	436	mutex_unlock(&register_mutex);
1da177e4 LT	437	return 0;
	438	}
	439
c461482c	440	static int snd_hwdep_dev_disconnect(struct snd_device *device)
1da177e4	441	{
d9a98de2	442	struct snd_hwdep *hwdep = device->device_data;
1da177e4 LT	443
1da177e4 LT	444	snd_assert(hwdep != NULL, return -ENXIO);
1a60d4c5	445	mutex_lock(&register_mutex);
f87135f5	446	if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
1a60d4c5	447	mutex_unlock(&register_mutex);
1da177e4 LT	448	return -EINVAL;
	449	}
	450	#ifdef CONFIG_SND_OSSEMUL
	451	if (hwdep->ossreg)
	452	snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
	453	#endif
	454	snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
c461482c	455	list_del_init(&hwdep->list);
1a60d4c5	456	mutex_unlock(&register_mutex);
c461482c	457	return 0;
1da177e4 LT	458	}
1da177e4 LT	459
e28563cc	460	#ifdef CONFIG_PROC_FS
1da177e4 LT	461	/*
	462	* Info interface
	463	*/
	464
d9a98de2 TI	465	static void snd_hwdep_proc_read(struct snd_info_entry *entry,
d9a98de2 TI	466	struct snd_info_buffer *buffer)
1da177e4	467	{
d9a98de2	468	struct snd_hwdep *hwdep;
1da177e4	469
1a60d4c5	470	mutex_lock(&register_mutex);
9244b2c3	471	list_for_each_entry(hwdep, &snd_hwdep_devices, list)
1da177e4	472	snd_iprintf(buffer, "%02i-%02i: %s\n",
f87135f5	473	hwdep->card->number, hwdep->device, hwdep->name);
1a60d4c5	474	mutex_unlock(&register_mutex);
1da177e4 LT	475	}
1da177e4 LT	476
e28563cc	477	static struct snd_info_entry *snd_hwdep_proc_entry;
1da177e4	478
e28563cc	479	static void __init snd_hwdep_proc_init(void)
1da177e4	480	{
d9a98de2	481	struct snd_info_entry *entry;
1da177e4	482
1da177e4	483	if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
1da177e4 LT	484	entry->c.text.read = snd_hwdep_proc_read;
	485	if (snd_info_register(entry) < 0) {
	486	snd_info_free_entry(entry);
	487	entry = NULL;
	488	}
	489	}
	490	snd_hwdep_proc_entry = entry;
e28563cc TI	491	}
	492
	493	static void __exit snd_hwdep_proc_done(void)
	494	{
746d4a02	495	snd_info_free_entry(snd_hwdep_proc_entry);
e28563cc TI	496	}
	497	#else /* !CONFIG_PROC_FS */
	498	#define snd_hwdep_proc_init()
	499	#define snd_hwdep_proc_done()
	500	#endif /* CONFIG_PROC_FS */
	501
	502
	503	/*
	504	* ENTRY functions
	505	*/
	506
	507	static int __init alsa_hwdep_init(void)
	508	{
	509	snd_hwdep_proc_init();
1da177e4 LT	510	snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
	511	snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
	512	return 0;
	513	}
	514
	515	static void __exit alsa_hwdep_exit(void)
	516	{
	517	snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
	518	snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
e28563cc	519	snd_hwdep_proc_done();
1da177e4 LT	520	}
	521
	522	module_init(alsa_hwdep_init)
	523	module_exit(alsa_hwdep_exit)
	524
	525	EXPORT_SYMBOL(snd_hwdep_new);