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

/*
 *  Hardware dependent layer
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 *
 *
 *   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 <sound/core.h>
#include <sound/control.h>
#include <sound/minors.h>
#include <sound/hwdep.h>
#include <sound/info.h>

MODULE_AUTHOR("Jaroslav Kysela <[email protected]>");
MODULE_DESCRIPTION("Hardware dependent layer");
MODULE_LICENSE("GPL");

static snd_hwdep_t *snd_hwdep_devices[SNDRV_CARDS * SNDRV_MINOR_HWDEPS];

static DECLARE_MUTEX(register_mutex);

static int snd_hwdep_free(snd_hwdep_t *hwdep);
static int snd_hwdep_dev_free(snd_device_t *device);
static int snd_hwdep_dev_register(snd_device_t *device);
static int snd_hwdep_dev_unregister(snd_device_t *device);

/*

 */

static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
{
	snd_hwdep_t *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)
{
	snd_hwdep_t *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)
{
	snd_hwdep_t *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);
	int cardnum;
	int device;
	snd_hwdep_t *hw;
	int err;
	wait_queue_t wait;

	switch (major) {
	case CONFIG_SND_MAJOR:
		cardnum = SNDRV_MINOR_CARD(iminor(inode));
		device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_HWDEP;
		break;
#ifdef CONFIG_SND_OSSEMUL
	case SOUND_MAJOR:
		cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
		device = 0;
		break;
#endif
	default:
		return -ENXIO;
	}
	cardnum %= SNDRV_CARDS;
	device %= SNDRV_MINOR_HWDEPS;
	hw = snd_hwdep_devices[(cardnum * SNDRV_MINOR_HWDEPS) + device];
	if (hw == NULL)
		return -ENODEV;

	if (!hw->ops.open)
		return -ENXIO;
#ifdef CONFIG_SND_OSSEMUL
	if (major == SOUND_MAJOR && hw->oss_type < 0)
		return -ENXIO;
#endif

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

	init_waitqueue_entry(&wait, current);
	add_wait_queue(&hw->open_wait, &wait);
	down(&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);
		up(&hw->open_mutex);
		schedule();
		down(&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);
		}
	}
	up(&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;
	snd_hwdep_t *hw = file->private_data;
	down(&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);
	up(&hw->open_mutex);
	module_put(hw->card->module);
	return err;
}

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

static int snd_hwdep_info(snd_hwdep_t *hw, snd_hwdep_info_t __user *_info)
{
	snd_hwdep_info_t 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(snd_hwdep_t *hw, snd_hwdep_dsp_status_t __user *_info)
{
	snd_hwdep_dsp_status_t 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(snd_hwdep_t *hw, snd_hwdep_dsp_image_t __user *_info)
{
	snd_hwdep_dsp_image_t 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)
{
	snd_hwdep_t *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)
{
	snd_hwdep_t *hw = file->private_data;
	if (hw->ops.mmap)
		return hw->ops.mmap(hw, file, vma);
	return -ENXIO;
}

static int snd_hwdep_control_ioctl(snd_card_t * card, snd_ctl_file_t * control,
				   unsigned int cmd, unsigned long arg)
{
	unsigned int tmp;
	
	tmp = card->number * SNDRV_MINOR_HWDEPS;
	switch (cmd) {
	case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
		{
			int device;

			if (get_user(device, (int __user *)arg))
				return -EFAULT;
			device = device < 0 ? 0 : device + 1;
			while (device < SNDRV_MINOR_HWDEPS) {
				if (snd_hwdep_devices[tmp + device])
					break;
				device++;
			}
			if (device >= SNDRV_MINOR_HWDEPS)
				device = -1;
			if (put_user(device, (int __user *)arg))
				return -EFAULT;
			return 0;
		}
	case SNDRV_CTL_IOCTL_HWDEP_INFO:
		{
			snd_hwdep_info_t __user *info = (snd_hwdep_info_t __user *)arg;
			int device;
			snd_hwdep_t *hwdep;

			if (get_user(device, &info->device))
				return -EFAULT;
			if (device < 0 || device >= SNDRV_MINOR_HWDEPS)
				return -ENXIO;
			hwdep = snd_hwdep_devices[tmp + device];
			if (hwdep == NULL)
				return -ENXIO;
			return snd_hwdep_info(hwdep, info);
		}
	}
	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,
};

static snd_minor_t snd_hwdep_reg =
{
	.comment =	"hardware dependent",
	.f_ops =	&snd_hwdep_f_ops,
};

/**
 * 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(snd_card_t * card, char *id, int device, snd_hwdep_t ** rhwdep)
{
	snd_hwdep_t *hwdep;
	int err;
	static snd_device_ops_t ops = {
		.dev_free = snd_hwdep_dev_free,
		.dev_register = snd_hwdep_dev_register,
		.dev_unregister = snd_hwdep_dev_unregister
	};

	snd_assert(rhwdep != NULL, return -EINVAL);
	*rhwdep = NULL;
	snd_assert(card != NULL, return -ENXIO);
	hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
	if (hwdep == NULL)
		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);
	init_MUTEX(&hwdep->open_mutex);
	*rhwdep = hwdep;
	return 0;
}

static int snd_hwdep_free(snd_hwdep_t *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(snd_device_t *device)
{
	snd_hwdep_t *hwdep = device->device_data;
	return snd_hwdep_free(hwdep);
}

static int snd_hwdep_dev_register(snd_device_t *device)
{
	snd_hwdep_t *hwdep = device->device_data;
	int idx, err;
	char name[32];

	down(&register_mutex);
	idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
	if (snd_hwdep_devices[idx]) {
		up(&register_mutex);
		return -EBUSY;
	}
	snd_hwdep_devices[idx] = hwdep;
	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_reg, name)) < 0) {
		snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
			   hwdep->card->number, hwdep->device);
		snd_hwdep_devices[idx] = NULL;
		up(&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_reg, 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
	up(&register_mutex);
	return 0;
}

static int snd_hwdep_dev_unregister(snd_device_t *device)
{
	snd_hwdep_t *hwdep = device->device_data;
	int idx;

	snd_assert(hwdep != NULL, return -ENXIO);
	down(&register_mutex);
	idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
	if (snd_hwdep_devices[idx] != hwdep) {
		up(&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);
	snd_hwdep_devices[idx] = NULL;
	up(&register_mutex);
	return snd_hwdep_free(hwdep);
}

/*
 *  Info interface
 */

static void snd_hwdep_proc_read(snd_info_entry_t *entry,
				snd_info_buffer_t * buffer)
{
	int idx;
	snd_hwdep_t *hwdep;

	down(&register_mutex);
	for (idx = 0; idx < SNDRV_CARDS * SNDRV_MINOR_HWDEPS; idx++) {
		hwdep = snd_hwdep_devices[idx];
		if (hwdep == NULL)
			continue;
		snd_iprintf(buffer, "%02i-%02i: %s\n",
					idx / SNDRV_MINOR_HWDEPS,
					idx % SNDRV_MINOR_HWDEPS,
					hwdep->name);
	}
	up(&register_mutex);
}

/*
 *  ENTRY functions
 */

static snd_info_entry_t *snd_hwdep_proc_entry = NULL;

static int __init alsa_hwdep_init(void)
{
	snd_info_entry_t *entry;

	memset(snd_hwdep_devices, 0, sizeof(snd_hwdep_devices));
	if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
		entry->c.text.read_size = 512;
		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;
	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);
	if (snd_hwdep_proc_entry) {
		snd_info_unregister(snd_hwdep_proc_entry);
		snd_hwdep_proc_entry = NULL;
	}
}

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 <[email protected]>
	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>
	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
	34	MODULE_AUTHOR("Jaroslav Kysela <[email protected]>");
	35	MODULE_DESCRIPTION("Hardware dependent layer");
	36	MODULE_LICENSE("GPL");
	37
	38	static snd_hwdep_t snd_hwdep_devices[SNDRV_CARDS SNDRV_MINOR_HWDEPS];
	39
	40	static DECLARE_MUTEX(register_mutex);
	41
	42	static int snd_hwdep_free(snd_hwdep_t *hwdep);
	43	static int snd_hwdep_dev_free(snd_device_t *device);
	44	static int snd_hwdep_dev_register(snd_device_t *device);
	45	static int snd_hwdep_dev_unregister(snd_device_t *device);
	46
	47	/*
	48
	49	*/
	50
	51	static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig)
	52	{
	53	snd_hwdep_t *hw = file->private_data;
	54	if (hw->ops.llseek)
	55	return hw->ops.llseek(hw, file, offset, orig);
	56	return -ENXIO;
	57	}
	58
	59	static ssize_t snd_hwdep_read(struct file * file, char __user buf, size_t count, loff_t offset)
	60	{
	61	snd_hwdep_t *hw = file->private_data;
	62	if (hw->ops.read)
	63	return hw->ops.read(hw, buf, count, offset);
	64	return -ENXIO;
65	}
66
67	static ssize_t snd_hwdep_write(struct file * file, const char __user buf, size_t count, loff_t offset)
68	{
69	snd_hwdep_t *hw = file->private_data;
70	if (hw->ops.write)
71	return hw->ops.write(hw, buf, count, offset);
72	return -ENXIO;
73	}
74
75	static int snd_hwdep_open(struct inode inode, struct file file)
76	{
77	int major = imajor(inode);
78	int cardnum;
79	int device;
80	snd_hwdep_t *hw;
81	int err;
82	wait_queue_t wait;
83
84	switch (major) {
85	case CONFIG_SND_MAJOR:
86	cardnum = SNDRV_MINOR_CARD(iminor(inode));
87	device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_HWDEP;
88	break;
89	#ifdef CONFIG_SND_OSSEMUL
90	case SOUND_MAJOR:
91	cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
92	device = 0;
93	break;
94	#endif
95	default:
96	return -ENXIO;
97	}
98	cardnum %= SNDRV_CARDS;
99	device %= SNDRV_MINOR_HWDEPS;
100	hw = snd_hwdep_devices[(cardnum * SNDRV_MINOR_HWDEPS) + device];
101	if (hw == NULL)
102	return -ENODEV;
103
104	if (!hw->ops.open)
105	return -ENXIO;
106	#ifdef CONFIG_SND_OSSEMUL
107	if (major == SOUND_MAJOR && hw->oss_type < 0)
108	return -ENXIO;
109	#endif
110
111	if (!try_module_get(hw->card->module))
112	return -EFAULT;
113
114	init_waitqueue_entry(&wait, current);
115	add_wait_queue(&hw->open_wait, &wait);
116	down(&hw->open_mutex);
117	while (1) {
118	if (hw->exclusive && hw->used > 0) {
119	err = -EBUSY;
120	break;
121	}
122	err = hw->ops.open(hw, file);
123	if (err >= 0)
124	break;
125	if (err == -EAGAIN) {
126	if (file->f_flags & O_NONBLOCK) {
127	err = -EBUSY;
128	break;
129	}
130	} else
131	break;
132	set_current_state(TASK_INTERRUPTIBLE);
133	up(&hw->open_mutex);
134	schedule();
135	down(&hw->open_mutex);
136	if (signal_pending(current)) {
137	err = -ERESTARTSYS;
138	break;
139	}
140	}
141	remove_wait_queue(&hw->open_wait, &wait);
142	if (err >= 0) {
143	err = snd_card_file_add(hw->card, file);
144	if (err >= 0) {
145	file->private_data = hw;
146	hw->used++;
147	} else {
148	if (hw->ops.release)
149	hw->ops.release(hw, file);
150	}
151	}
152	up(&hw->open_mutex);
153	if (err < 0)
154	module_put(hw->card->module);
155	return err;
156	}
157
158	static int snd_hwdep_release(struct inode inode, struct file file)
159	{
160	int err = -ENXIO;
161	snd_hwdep_t *hw = file->private_data;
162	down(&hw->open_mutex);
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);
170	up(&hw->open_mutex);
171	module_put(hw->card->module);
172	return err;
173	}
174
175	static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait)
176	{
177	snd_hwdep_t *hw = file->private_data;
178	if (hw->ops.poll)
179	return hw->ops.poll(hw, file, wait);
180	return 0;
181	}
182
183	static int snd_hwdep_info(snd_hwdep_t hw, snd_hwdep_info_t __user _info)
184	{
185	snd_hwdep_info_t info;
186
187	memset(&info, 0, sizeof(info));
188	info.card = hw->card->number;
189	strlcpy(info.id, hw->id, sizeof(info.id));
190	strlcpy(info.name, hw->name, sizeof(info.name));
191	info.iface = hw->iface;
192	if (copy_to_user(_info, &info, sizeof(info)))
193	return -EFAULT;
194	return 0;
195	}
196
197	static int snd_hwdep_dsp_status(snd_hwdep_t hw, snd_hwdep_dsp_status_t __user _info)
198	{
199	snd_hwdep_dsp_status_t info;
200	int err;
201
202	if (! hw->ops.dsp_status)
203	return -ENXIO;
204	memset(&info, 0, sizeof(info));
205	info.dsp_loaded = hw->dsp_loaded;
206	if ((err = hw->ops.dsp_status(hw, &info)) < 0)
207	return err;
208	if (copy_to_user(_info, &info, sizeof(info)))
209	return -EFAULT;
210	return 0;
211	}
212
213	static int snd_hwdep_dsp_load(snd_hwdep_t hw, snd_hwdep_dsp_image_t __user _info)
214	{
215	snd_hwdep_dsp_image_t info;
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
235	static long snd_hwdep_ioctl(struct file * file, unsigned int cmd, unsigned long arg)
236	{
237	snd_hwdep_t *hw = file->private_data;
238	void __user argp = (void __user )arg;
239	switch (cmd) {
240	case SNDRV_HWDEP_IOCTL_PVERSION:
241	return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp);
242	case SNDRV_HWDEP_IOCTL_INFO:
243	return snd_hwdep_info(hw, argp);
244	case SNDRV_HWDEP_IOCTL_DSP_STATUS:
245	return snd_hwdep_dsp_status(hw, argp);
246	case SNDRV_HWDEP_IOCTL_DSP_LOAD:
247	return snd_hwdep_dsp_load(hw, argp);
248	}
249	if (hw->ops.ioctl)
250	return hw->ops.ioctl(hw, file, cmd, arg);
251	return -ENOTTY;
252	}
253
254	static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma)
255	{
256	snd_hwdep_t *hw = file->private_data;
257	if (hw->ops.mmap)
258	return hw->ops.mmap(hw, file, vma);
259	return -ENXIO;
260	}
261
262	static int snd_hwdep_control_ioctl(snd_card_t * card, snd_ctl_file_t * control,
263	unsigned int cmd, unsigned long arg)
264	{
265	unsigned int tmp;
266
267	tmp = card->number * SNDRV_MINOR_HWDEPS;
268	switch (cmd) {
269	case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE:
270	{
271	int device;
272
273	if (get_user(device, (int __user *)arg))
274	return -EFAULT;
275	device = device < 0 ? 0 : device + 1;
276	while (device < SNDRV_MINOR_HWDEPS) {
277	if (snd_hwdep_devices[tmp + device])
278	break;
279	device++;
280	}
281	if (device >= SNDRV_MINOR_HWDEPS)
282	device = -1;
283	if (put_user(device, (int __user *)arg))
284	return -EFAULT;
285	return 0;
286	}
287	case SNDRV_CTL_IOCTL_HWDEP_INFO:
288	{
289	snd_hwdep_info_t __user info = (snd_hwdep_info_t __user )arg;
290	int device;
291	snd_hwdep_t *hwdep;
292
293	if (get_user(device, &info->device))
294	return -EFAULT;
295	if (device < 0 \|\| device >= SNDRV_MINOR_HWDEPS)
296	return -ENXIO;
297	hwdep = snd_hwdep_devices[tmp + device];
298	if (hwdep == NULL)
299	return -ENXIO;
300	return snd_hwdep_info(hwdep, info);
301	}
302	}
303	return -ENOIOCTLCMD;
304	}
305
306	#ifdef CONFIG_COMPAT
307	#include "hwdep_compat.c"
308	#else
309	#define snd_hwdep_ioctl_compat NULL
310	#endif
311
312	/*
313
314	*/
315
316	static struct file_operations snd_hwdep_f_ops =
317	{
318	.owner = THIS_MODULE,
319	.llseek = snd_hwdep_llseek,
320	.read = snd_hwdep_read,
321	.write = snd_hwdep_write,
322	.open = snd_hwdep_open,
323	.release = snd_hwdep_release,
324	.poll = snd_hwdep_poll,
325	.unlocked_ioctl = snd_hwdep_ioctl,
326	.compat_ioctl = snd_hwdep_ioctl_compat,
327	.mmap = snd_hwdep_mmap,
328	};
329
330	static snd_minor_t snd_hwdep_reg =
331	{
332	.comment = "hardware dependent",
333	.f_ops = &snd_hwdep_f_ops,
334	};
335
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	*/
349	int snd_hwdep_new(snd_card_t * card, char id, int device, snd_hwdep_t * rhwdep)
350	{
351	snd_hwdep_t *hwdep;
352	int err;
353	static snd_device_ops_t ops = {
354	.dev_free = snd_hwdep_dev_free,
355	.dev_register = snd_hwdep_dev_register,
356	.dev_unregister = snd_hwdep_dev_unregister
357	};
358
359	snd_assert(rhwdep != NULL, return -EINVAL);
360	*rhwdep = NULL;
361	snd_assert(card != NULL, return -ENXIO);
ca2c0966	362	hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL);
1da177e4 LT	363	if (hwdep == NULL)
	364	return -ENOMEM;
	365	hwdep->card = card;
	366	hwdep->device = device;
	367	if (id) {
	368	strlcpy(hwdep->id, id, sizeof(hwdep->id));
	369	}
	370	#ifdef CONFIG_SND_OSSEMUL
	371	hwdep->oss_type = -1;
	372	#endif
	373	if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
	374	snd_hwdep_free(hwdep);
	375	return err;
	376	}
	377	init_waitqueue_head(&hwdep->open_wait);
	378	init_MUTEX(&hwdep->open_mutex);
	379	*rhwdep = hwdep;
	380	return 0;
	381	}
	382
	383	static int snd_hwdep_free(snd_hwdep_t *hwdep)
	384	{
	385	snd_assert(hwdep != NULL, return -ENXIO);
	386	if (hwdep->private_free)
	387	hwdep->private_free(hwdep);
	388	kfree(hwdep);
	389	return 0;
	390	}
	391
	392	static int snd_hwdep_dev_free(snd_device_t *device)
	393	{
	394	snd_hwdep_t *hwdep = device->device_data;
	395	return snd_hwdep_free(hwdep);
	396	}
	397
	398	static int snd_hwdep_dev_register(snd_device_t *device)
	399	{
	400	snd_hwdep_t *hwdep = device->device_data;
	401	int idx, err;
	402	char name[32];
	403
	404	down(&register_mutex);
	405	idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
	406	if (snd_hwdep_devices[idx]) {
	407	up(&register_mutex);
	408	return -EBUSY;
	409	}
	410	snd_hwdep_devices[idx] = hwdep;
	411	sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
	412	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
	413	hwdep->card, hwdep->device,
	414	&snd_hwdep_reg, name)) < 0) {
	415	snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
	416	hwdep->card->number, hwdep->device);
	417	snd_hwdep_devices[idx] = NULL;
	418	up(&register_mutex);
	419	return err;
	420	}
	421	#ifdef CONFIG_SND_OSSEMUL
	422	hwdep->ossreg = 0;
	423	if (hwdep->oss_type >= 0) {
	424	if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
	425	snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n");
	426	} else {
427	if (snd_register_oss_device(hwdep->oss_type,
428	hwdep->card, hwdep->device,
429	&snd_hwdep_reg, hwdep->oss_dev) < 0) {
430	snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
431	hwdep->card->number, hwdep->device);
432	} else
433	hwdep->ossreg = 1;
434	}
435	}
436	#endif
437	up(&register_mutex);
438	return 0;
439	}
440
441	static int snd_hwdep_dev_unregister(snd_device_t *device)
442	{
443	snd_hwdep_t *hwdep = device->device_data;
444	int idx;
445
446	snd_assert(hwdep != NULL, return -ENXIO);
447	down(&register_mutex);
448	idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
449	if (snd_hwdep_devices[idx] != hwdep) {
450	up(&register_mutex);
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);
458	snd_hwdep_devices[idx] = NULL;
459	up(&register_mutex);
460	return snd_hwdep_free(hwdep);
461	}
462
463	/*
464	* Info interface
465	*/
466
467	static void snd_hwdep_proc_read(snd_info_entry_t *entry,
468	snd_info_buffer_t * buffer)
469	{
470	int idx;
471	snd_hwdep_t *hwdep;
472
473	down(&register_mutex);
474	for (idx = 0; idx < SNDRV_CARDS * SNDRV_MINOR_HWDEPS; idx++) {
475	hwdep = snd_hwdep_devices[idx];
476	if (hwdep == NULL)
477	continue;
478	snd_iprintf(buffer, "%02i-%02i: %s\n",
479	idx / SNDRV_MINOR_HWDEPS,
480	idx % SNDRV_MINOR_HWDEPS,
481	hwdep->name);
482	}
483	up(&register_mutex);
484	}
485
486	/*
487	* ENTRY functions
488	*/
489
490	static snd_info_entry_t *snd_hwdep_proc_entry = NULL;
491
492	static int __init alsa_hwdep_init(void)
493	{
494	snd_info_entry_t *entry;
495
496	memset(snd_hwdep_devices, 0, sizeof(snd_hwdep_devices));
497	if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) {
498	entry->c.text.read_size = 512;
499	entry->c.text.read = snd_hwdep_proc_read;
500	if (snd_info_register(entry) < 0) {
501	snd_info_free_entry(entry);
502	entry = NULL;
503	}
504	}
505	snd_hwdep_proc_entry = entry;
506	snd_ctl_register_ioctl(snd_hwdep_control_ioctl);
507	snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl);
508	return 0;
509	}
510
511	static void __exit alsa_hwdep_exit(void)
512	{
513	snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl);
514	snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl);
515	if (snd_hwdep_proc_entry) {
516	snd_info_unregister(snd_hwdep_proc_entry);
517	snd_hwdep_proc_entry = NULL;
518	}
519	}
520
521	module_init(alsa_hwdep_init)
522	module_exit(alsa_hwdep_exit)
523
524	EXPORT_SYMBOL(snd_hwdep_new);