linux/sound/core/hwdep.c

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/*
* 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 <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 struct snd_hwdep *snd_hwdep_devices[SNDRV_CARDS * SNDRV_MINOR_HWDEPS];
static DECLARE_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_unregister(struct snd_device *device);
/*
*/
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);
int cardnum;
int device;
struct snd_hwdep *hw;
int err;
wait_queue_t wait;
if (major == snd_major) {
cardnum = SNDRV_MINOR_CARD(iminor(inode));
device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_HWDEP;
#ifdef CONFIG_SND_OSSEMUL
} else if (major == SOUND_MAJOR) {
cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
device = 0;
#endif
} else
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;
struct snd_hwdep *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)
{
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)
{
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:
{
struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
int device;
struct snd_hwdep *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 struct snd_minor 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(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_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(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 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(struct snd_device *device)
{
struct snd_hwdep *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(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
int idx;
struct snd_hwdep *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 struct snd_info_entry *snd_hwdep_proc_entry = NULL;
static int __init alsa_hwdep_init(void)
{
struct snd_info_entry *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);