mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 22:21:40 +00:00
ca2c096656
Control Midlevel,ALSA Core,HWDEP Midlevel,PCM Midlevel,RawMidi Midlevel Timer Midlevel,ALSA<-OSS emulation Replace kcalloc(1,..) with kzalloc(). Signed-off-by: Takashi Iwai <tiwai@suse.de>
525 lines
13 KiB
C
525 lines
13 KiB
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 <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 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(®ister_mutex);
|
|
idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
|
|
if (snd_hwdep_devices[idx]) {
|
|
up(®ister_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(®ister_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(®ister_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(®ister_mutex);
|
|
idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
|
|
if (snd_hwdep_devices[idx] != hwdep) {
|
|
up(®ister_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(®ister_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(®ister_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(®ister_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);
|