[ALSA] dynamic minors (3/6): store device-specific object pointers dynamically
Instead of storing the pointers to the device-specific structures in an
array, put them into the struct snd_minor, and look them up dynamically.
This makes the device type modules independent of the minor number
encoding.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/include/sound/core.h b/include/sound/core.h
index 67b0a7e..90ac613 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -187,6 +187,7 @@
int card; /* card number */
int device; /* device number */
struct file_operations *f_ops; /* file operations */
+ void *private_data; /* private data for f_ops->open */
char name[0]; /* device name (keep at the end of
structure) */
};
@@ -199,13 +200,17 @@
void snd_request_card(int card);
int snd_register_device(int type, struct snd_card *card, int dev,
- struct file_operations *f_ops, const char *name);
+ struct file_operations *f_ops, void *private_data,
+ const char *name);
int snd_unregister_device(int type, struct snd_card *card, int dev);
+void *snd_lookup_minor_data(unsigned int minor, int type);
#ifdef CONFIG_SND_OSSEMUL
int snd_register_oss_device(int type, struct snd_card *card, int dev,
- struct file_operations *f_ops, const char *name);
+ struct file_operations *f_ops, void *private_data,
+ const char *name);
int snd_unregister_oss_device(int type, struct snd_card *card, int dev);
+void *snd_lookup_oss_minor_data(unsigned int minor, int type);
#endif
int snd_minor_info_init(void);
diff --git a/include/sound/hwdep.h b/include/sound/hwdep.h
index 04b20bc..c679e5b 100644
--- a/include/sound/hwdep.h
+++ b/include/sound/hwdep.h
@@ -43,6 +43,7 @@
struct snd_hwdep {
struct snd_card *card;
+ struct list_head list;
int device;
char id[32];
char name[80];
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 5e29b0e..314268a 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -412,6 +412,7 @@
struct snd_pcm {
struct snd_card *card;
+ struct list_head list;
unsigned int device; /* device number */
unsigned int info_flags;
unsigned short dev_class;
@@ -439,7 +440,6 @@
* Registering
*/
-extern struct snd_pcm *snd_pcm_devices[];
extern struct file_operations snd_pcm_f_ops[2];
int snd_pcm_new(struct snd_card *card, char *id, int device,
diff --git a/include/sound/rawmidi.h b/include/sound/rawmidi.h
index 9492a32..d19bddf 100644
--- a/include/sound/rawmidi.h
+++ b/include/sound/rawmidi.h
@@ -113,7 +113,7 @@
struct snd_rawmidi {
struct snd_card *card;
-
+ struct list_head list;
unsigned int device; /* device number */
unsigned int info_flags; /* SNDRV_RAWMIDI_INFO_XXXX */
char id[64];
@@ -165,8 +165,8 @@
/* main midi functions */
int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info);
-int snd_rawmidi_kernel_open(int cardnum, int device, int subdevice, int mode,
- struct snd_rawmidi_file *rfile);
+int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
+ int mode, struct snd_rawmidi_file *rfile);
int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile);
int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
struct snd_rawmidi_params *params);
diff --git a/sound/core/control.c b/sound/core/control.c
index 23561e7..abd62f9 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -47,13 +47,12 @@
static int snd_ctl_open(struct inode *inode, struct file *file)
{
- int cardnum = SNDRV_MINOR_CARD(iminor(inode));
unsigned long flags;
struct snd_card *card;
struct snd_ctl_file *ctl;
int err;
- card = snd_cards[cardnum];
+ card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL);
if (!card) {
err = -ENODEV;
goto __error1;
@@ -1277,8 +1276,8 @@
cardnum = card->number;
snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
sprintf(name, "controlC%i", cardnum);
- if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL,
- card, -1, &snd_ctl_f_ops, name)) < 0)
+ if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1,
+ &snd_ctl_f_ops, card, name)) < 0)
return err;
return 0;
}
diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 27d5bf7..b8c0c8c 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -35,8 +35,7 @@
MODULE_DESCRIPTION("Hardware dependent layer");
MODULE_LICENSE("GPL");
-static struct snd_hwdep *snd_hwdep_devices[SNDRV_CARDS * SNDRV_MINOR_HWDEPS];
-
+static LIST_HEAD(snd_hwdep_devices);
static DECLARE_MUTEX(register_mutex);
static int snd_hwdep_free(struct snd_hwdep *hwdep);
@@ -44,9 +43,19 @@
static int snd_hwdep_dev_register(struct snd_device *device);
static int snd_hwdep_dev_unregister(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)
{
@@ -77,34 +86,25 @@
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;
+ hw = snd_lookup_minor_data(iminor(inode),
+ SNDRV_DEVICE_TYPE_HWDEP);
#ifdef CONFIG_SND_OSSEMUL
} else if (major == SOUND_MAJOR) {
- cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
- device = 0;
+ hw = snd_lookup_oss_minor_data(iminor(inode),
+ SNDRV_OSS_DEVICE_TYPE_DMFM);
#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;
@@ -265,9 +265,6 @@
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:
{
@@ -275,14 +272,16 @@
if (get_user(device, (int __user *)arg))
return -EFAULT;
+ down(®ister_mutex);
device = device < 0 ? 0 : device + 1;
while (device < SNDRV_MINOR_HWDEPS) {
- if (snd_hwdep_devices[tmp + device])
+ if (snd_hwdep_search(card, device))
break;
device++;
}
if (device >= SNDRV_MINOR_HWDEPS)
device = -1;
+ up(®ister_mutex);
if (put_user(device, (int __user *)arg))
return -EFAULT;
return 0;
@@ -290,17 +289,19 @@
case SNDRV_CTL_IOCTL_HWDEP_INFO:
{
struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg;
- int device;
+ int device, err;
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);
+ down(®ister_mutex);
+ hwdep = snd_hwdep_search(card, device);
+ if (hwdep)
+ err = snd_hwdep_info(hwdep, info);
+ else
+ err = -ENXIO;
+ up(®ister_mutex);
+ return err;
}
}
return -ENOIOCTLCMD;
@@ -397,23 +398,22 @@
static int snd_hwdep_dev_register(struct snd_device *device)
{
struct snd_hwdep *hwdep = device->device_data;
- int idx, err;
+ int err;
char name[32];
down(®ister_mutex);
- idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
- if (snd_hwdep_devices[idx]) {
+ if (snd_hwdep_search(hwdep->card, hwdep->device)) {
up(®ister_mutex);
return -EBUSY;
}
- snd_hwdep_devices[idx] = hwdep;
+ 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, name)) < 0) {
+ &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);
- snd_hwdep_devices[idx] = NULL;
+ list_del(&hwdep->list);
up(®ister_mutex);
return err;
}
@@ -425,7 +425,7 @@
} else {
if (snd_register_oss_device(hwdep->oss_type,
hwdep->card, hwdep->device,
- &snd_hwdep_f_ops,
+ &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);
@@ -441,12 +441,10 @@
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(®ister_mutex);
- idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device;
- if (snd_hwdep_devices[idx] != hwdep) {
+ if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) {
up(®ister_mutex);
return -EINVAL;
}
@@ -455,7 +453,7 @@
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;
+ list_del(&hwdep->list);
up(®ister_mutex);
return snd_hwdep_free(hwdep);
}
@@ -467,18 +465,14 @@
static void snd_hwdep_proc_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
- int idx;
+ struct list_head *p;
struct snd_hwdep *hwdep;
down(®ister_mutex);
- for (idx = 0; idx < SNDRV_CARDS * SNDRV_MINOR_HWDEPS; idx++) {
- hwdep = snd_hwdep_devices[idx];
- if (hwdep == NULL)
- continue;
+ list_for_each(p, &snd_hwdep_devices) {
+ hwdep = list_entry(p, struct snd_hwdep, list);
snd_iprintf(buffer, "%02i-%02i: %s\n",
- idx / SNDRV_MINOR_HWDEPS,
- idx % SNDRV_MINOR_HWDEPS,
- hwdep->name);
+ hwdep->card->number, hwdep->device, hwdep->name);
}
up(®ister_mutex);
}
@@ -493,9 +487,8 @@
{
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_size = PAGE_SIZE;
entry->c.text.read = snd_hwdep_proc_read;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
diff --git a/sound/core/oss/mixer_oss.c b/sound/core/oss/mixer_oss.c
index 2dd6bf9b..2d7a420 100644
--- a/sound/core/oss/mixer_oss.c
+++ b/sound/core/oss/mixer_oss.c
@@ -41,12 +41,13 @@
static int snd_mixer_oss_open(struct inode *inode, struct file *file)
{
- int cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
struct snd_card *card;
struct snd_mixer_oss_file *fmixer;
int err;
- if ((card = snd_cards[cardnum]) == NULL)
+ card = snd_lookup_oss_minor_data(iminor(inode),
+ SNDRV_OSS_DEVICE_TYPE_MIXER);
+ if (card == NULL)
return -ENODEV;
if (card->mixer_oss == NULL)
return -ENODEV;
@@ -1286,7 +1287,7 @@
sprintf(name, "mixer%i%i", card->number, 0);
if ((err = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER,
card, 0,
- &snd_mixer_oss_f_ops,
+ &snd_mixer_oss_f_ops, card,
name)) < 0) {
snd_printk(KERN_ERR "unable to register OSS mixer device %i:%i\n",
card->number, 0);
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 947bf08..2ae283c 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -1834,9 +1834,6 @@
static int snd_pcm_oss_open(struct inode *inode, struct file *file)
{
- int minor = iminor(inode);
- int cardnum = SNDRV_MINOR_OSS_CARD(minor);
- int device;
int err;
char task_name[32];
struct snd_pcm *pcm;
@@ -1845,11 +1842,8 @@
int nonblock;
wait_queue_t wait;
- snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
- device = SNDRV_MINOR_OSS_DEVICE(minor) == SNDRV_MINOR_OSS_PCM1 ?
- adsp_map[cardnum] : dsp_map[cardnum];
-
- pcm = snd_pcm_devices[(cardnum * SNDRV_PCM_DEVICES) + device];
+ pcm = snd_lookup_oss_minor_data(iminor(inode),
+ SNDRV_OSS_DEVICE_TYPE_PCM);
if (pcm == NULL) {
err = -ENODEV;
goto __error1;
@@ -1890,7 +1884,7 @@
down(&pcm->open_mutex);
while (1) {
err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
- minor, psetup, csetup);
+ iminor(inode), psetup, csetup);
if (err >= 0)
break;
if (err == -EAGAIN) {
@@ -2450,7 +2444,7 @@
sprintf(name, "dsp%i%i", pcm->card->number, pcm->device);
if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
pcm->card, index, &snd_pcm_oss_f_reg,
- name) < 0) {
+ pcm, name) < 0) {
snd_printk(KERN_ERR "unable to register OSS PCM device %i:%i\n",
pcm->card->number, pcm->device);
}
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 2bc5f69e..95036c8 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -33,7 +33,7 @@
MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
MODULE_LICENSE("GPL");
-struct snd_pcm *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES];
+static LIST_HEAD(snd_pcm_devices);
static LIST_HEAD(snd_pcm_notify_list);
static DECLARE_MUTEX(register_mutex);
@@ -43,13 +43,23 @@
static int snd_pcm_dev_disconnect(struct snd_device *device);
static int snd_pcm_dev_unregister(struct snd_device *device);
+static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
+{
+ struct list_head *p;
+ struct snd_pcm *pcm;
+
+ list_for_each(p, &snd_pcm_devices) {
+ pcm = list_entry(p, struct snd_pcm, list);
+ if (pcm->card == card && pcm->device == device)
+ return pcm;
+ }
+ return NULL;
+}
+
static int snd_pcm_control_ioctl(struct snd_card *card,
struct snd_ctl_file *control,
unsigned int cmd, unsigned long arg)
{
- unsigned int tmp;
-
- tmp = card->number * SNDRV_PCM_DEVICES;
switch (cmd) {
case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
{
@@ -57,14 +67,16 @@
if (get_user(device, (int __user *)arg))
return -EFAULT;
+ down(®ister_mutex);
device = device < 0 ? 0 : device + 1;
while (device < SNDRV_PCM_DEVICES) {
- if (snd_pcm_devices[tmp + device])
+ if (snd_pcm_search(card, device))
break;
device++;
}
if (device == SNDRV_PCM_DEVICES)
device = -1;
+ up(®ister_mutex);
if (put_user(device, (int __user *)arg))
return -EFAULT;
return 0;
@@ -77,31 +89,44 @@
struct snd_pcm *pcm;
struct snd_pcm_str *pstr;
struct snd_pcm_substream *substream;
+ int err;
+
info = (struct snd_pcm_info __user *)arg;
if (get_user(device, &info->device))
return -EFAULT;
- if (device >= SNDRV_PCM_DEVICES)
- return -ENXIO;
- pcm = snd_pcm_devices[tmp + device];
- if (pcm == NULL)
- return -ENXIO;
if (get_user(stream, &info->stream))
return -EFAULT;
if (stream < 0 || stream > 1)
return -EINVAL;
- pstr = &pcm->streams[stream];
- if (pstr->substream_count == 0)
- return -ENOENT;
if (get_user(subdevice, &info->subdevice))
return -EFAULT;
- if (subdevice >= pstr->substream_count)
- return -ENXIO;
- for (substream = pstr->substream; substream; substream = substream->next)
+ down(®ister_mutex);
+ pcm = snd_pcm_search(card, device);
+ if (pcm == NULL) {
+ err = -ENXIO;
+ goto _error;
+ }
+ pstr = &pcm->streams[stream];
+ if (pstr->substream_count == 0) {
+ err = -ENOENT;
+ goto _error;
+ }
+ if (subdevice >= pstr->substream_count) {
+ err = -ENXIO;
+ goto _error;
+ }
+ for (substream = pstr->substream; substream;
+ substream = substream->next)
if (substream->number == (int)subdevice)
break;
- if (substream == NULL)
- return -ENXIO;
- return snd_pcm_info_user(substream, info);
+ if (substream == NULL) {
+ err = -ENXIO;
+ goto _error;
+ }
+ err = snd_pcm_info_user(substream, info);
+ _error:
+ up(®ister_mutex);
+ return err;
}
case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
{
@@ -865,8 +890,7 @@
static int snd_pcm_dev_register(struct snd_device *device)
{
- int idx, cidx, err;
- unsigned short minor;
+ int cidx, err;
struct snd_pcm_substream *substream;
struct list_head *list;
char str[16];
@@ -874,12 +898,11 @@
snd_assert(pcm != NULL && device != NULL, return -ENXIO);
down(®ister_mutex);
- idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
- if (snd_pcm_devices[idx]) {
+ if (snd_pcm_search(pcm->card, pcm->device)) {
up(®ister_mutex);
return -EBUSY;
}
- snd_pcm_devices[idx] = pcm;
+ list_add_tail(&pcm->list, &snd_pcm_devices);
for (cidx = 0; cidx < 2; cidx++) {
int devtype = -1;
if (pcm->streams[cidx].substream == NULL)
@@ -887,20 +910,19 @@
switch (cidx) {
case SNDRV_PCM_STREAM_PLAYBACK:
sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
- minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
break;
case SNDRV_PCM_STREAM_CAPTURE:
sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
- minor = SNDRV_MINOR_PCM_CAPTURE + idx;
devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
break;
}
if ((err = snd_register_device(devtype, pcm->card,
pcm->device,
- &snd_pcm_f_ops[cidx], str)) < 0)
+ &snd_pcm_f_ops[cidx],
+ pcm, str)) < 0)
{
- snd_pcm_devices[idx] = NULL;
+ list_del(&pcm->list);
up(®ister_mutex);
return err;
}
@@ -921,11 +943,10 @@
struct snd_pcm *pcm = device->device_data;
struct list_head *list;
struct snd_pcm_substream *substream;
- int idx, cidx;
+ int cidx;
down(®ister_mutex);
- idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
- snd_pcm_devices[idx] = NULL;
+ list_del_init(&pcm->list);
for (cidx = 0; cidx < 2; cidx++)
for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
if (substream->runtime)
@@ -941,15 +962,14 @@
static int snd_pcm_dev_unregister(struct snd_device *device)
{
- int idx, cidx, devtype;
+ int cidx, devtype;
struct snd_pcm_substream *substream;
struct list_head *list;
struct snd_pcm *pcm = device->device_data;
snd_assert(pcm != NULL, return -ENXIO);
down(®ister_mutex);
- idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
- snd_pcm_devices[idx] = NULL;
+ list_del(&pcm->list);
for (cidx = 0; cidx < 2; cidx++) {
devtype = -1;
switch (cidx) {
@@ -975,24 +995,19 @@
int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
{
- int idx;
+ struct list_head *p;
snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
down(®ister_mutex);
if (nfree) {
list_del(¬ify->list);
- for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
- if (snd_pcm_devices[idx] == NULL)
- continue;
- notify->n_unregister(snd_pcm_devices[idx]);
- }
+ list_for_each(p, &snd_pcm_devices)
+ notify->n_unregister(list_entry(p,
+ struct snd_pcm, list));
} else {
list_add_tail(¬ify->list, &snd_pcm_notify_list);
- for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
- if (snd_pcm_devices[idx] == NULL)
- continue;
- notify->n_register(snd_pcm_devices[idx]);
- }
+ list_for_each(p, &snd_pcm_devices)
+ notify->n_register(list_entry(p, struct snd_pcm, list));
}
up(®ister_mutex);
return 0;
@@ -1005,16 +1020,14 @@
static void snd_pcm_proc_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
- int idx;
+ struct list_head *p;
struct snd_pcm *pcm;
down(®ister_mutex);
- for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
- pcm = snd_pcm_devices[idx];
- if (pcm == NULL)
- continue;
- snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
- idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
+ list_for_each(p, &snd_pcm_devices) {
+ pcm = list_entry(p, struct snd_pcm, list);
+ snd_iprintf(buffer, "%02i-%02i: %s : %s",
+ pcm->card->number, pcm->device, pcm->id, pcm->name);
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
snd_iprintf(buffer, " : playback %i",
pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
@@ -1063,7 +1076,6 @@
module_init(alsa_pcm_init)
module_exit(alsa_pcm_exit)
-EXPORT_SYMBOL(snd_pcm_devices);
EXPORT_SYMBOL(snd_pcm_new);
EXPORT_SYMBOL(snd_pcm_new_stream);
EXPORT_SYMBOL(snd_pcm_notify);
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index bb40c01..9010306 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -62,6 +62,7 @@
struct snd_pcm_hw_params_old __user * _oparams);
static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params_old __user * _oparams);
+static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
/*
*
@@ -1554,7 +1555,8 @@
{
struct file *file;
struct inode *inode;
- unsigned short minor;
+ unsigned int minor;
+
file = fget(fd);
if (!file)
return NULL;
@@ -1565,8 +1567,8 @@
return NULL;
}
minor = iminor(inode);
- if (minor >= 256 ||
- minor % SNDRV_MINOR_DEVICES < SNDRV_MINOR_PCM_PLAYBACK) {
+ if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
+ !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
fput(file);
return NULL;
}
@@ -2071,18 +2073,30 @@
return 0;
}
-static int snd_pcm_open(struct inode *inode, struct file *file)
+static int snd_pcm_playback_open(struct inode *inode, struct file *file)
{
- int cardnum = SNDRV_MINOR_CARD(iminor(inode));
- int device = SNDRV_MINOR_DEVICE(iminor(inode));
- int err;
struct snd_pcm *pcm;
+
+ pcm = snd_lookup_minor_data(iminor(inode),
+ SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
+ return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
+}
+
+static int snd_pcm_capture_open(struct inode *inode, struct file *file)
+{
+ struct snd_pcm *pcm;
+
+ pcm = snd_lookup_minor_data(iminor(inode),
+ SNDRV_DEVICE_TYPE_PCM_CAPTURE);
+ return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
+}
+
+static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
+{
+ int err;
struct snd_pcm_file *pcm_file;
wait_queue_t wait;
- if (device < SNDRV_MINOR_PCM_PLAYBACK || device >= SNDRV_MINOR_DEVICES)
- return -ENXIO;
- pcm = snd_pcm_devices[(cardnum * SNDRV_PCM_DEVICES) + (device % SNDRV_MINOR_PCMS)];
if (pcm == NULL) {
err = -ENODEV;
goto __error1;
@@ -2098,7 +2112,7 @@
add_wait_queue(&pcm->open_wait, &wait);
down(&pcm->open_mutex);
while (1) {
- err = snd_pcm_open_file(file, pcm, device >= SNDRV_MINOR_PCM_CAPTURE ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK, &pcm_file);
+ err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
if (err >= 0)
break;
if (err == -EAGAIN) {
@@ -3375,7 +3389,7 @@
.owner = THIS_MODULE,
.write = snd_pcm_write,
.writev = snd_pcm_writev,
- .open = snd_pcm_open,
+ .open = snd_pcm_playback_open,
.release = snd_pcm_release,
.poll = snd_pcm_playback_poll,
.unlocked_ioctl = snd_pcm_playback_ioctl,
@@ -3387,7 +3401,7 @@
.owner = THIS_MODULE,
.read = snd_pcm_read,
.readv = snd_pcm_readv,
- .open = snd_pcm_open,
+ .open = snd_pcm_capture_open,
.release = snd_pcm_release,
.poll = snd_pcm_capture_poll,
.unlocked_ioctl = snd_pcm_capture_ioctl,
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 7ac77e5..e6ee0d8 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -56,10 +56,22 @@
static int snd_rawmidi_dev_disconnect(struct snd_device *device);
static int snd_rawmidi_dev_unregister(struct snd_device *device);
-static struct snd_rawmidi *snd_rawmidi_devices[SNDRV_CARDS * SNDRV_RAWMIDI_DEVICES];
-
+static LIST_HEAD(snd_rawmidi_devices);
static DECLARE_MUTEX(register_mutex);
+static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
+{
+ struct list_head *p;
+ struct snd_rawmidi *rawmidi;
+
+ list_for_each(p, &snd_rawmidi_devices) {
+ rawmidi = list_entry(p, struct snd_rawmidi, list);
+ if (rawmidi->card == card && rawmidi->device == device)
+ return rawmidi;
+ }
+ return NULL;
+}
+
static inline unsigned short snd_rawmidi_file_flags(struct file *file)
{
switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
@@ -214,7 +226,7 @@
return 0;
}
-int snd_rawmidi_kernel_open(int cardnum, int device, int subdevice,
+int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
int mode, struct snd_rawmidi_file * rfile)
{
struct snd_rawmidi *rmidi;
@@ -225,7 +237,9 @@
if (rfile)
rfile->input = rfile->output = NULL;
- rmidi = snd_rawmidi_devices[(cardnum * SNDRV_RAWMIDI_DEVICES) + device];
+ down(®ister_mutex);
+ rmidi = snd_rawmidi_search(card, device);
+ up(®ister_mutex);
if (rmidi == NULL) {
err = -ENODEV;
goto __error1;
@@ -368,9 +382,8 @@
static int snd_rawmidi_open(struct inode *inode, struct file *file)
{
int maj = imajor(inode);
- int cardnum;
struct snd_card *card;
- int device, subdevice;
+ int subdevice;
unsigned short fflags;
int err;
struct snd_rawmidi *rmidi;
@@ -380,27 +393,18 @@
struct snd_ctl_file *kctl;
if (maj == snd_major) {
- cardnum = SNDRV_MINOR_CARD(iminor(inode));
- cardnum %= SNDRV_CARDS;
- device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_RAWMIDI;
- device %= SNDRV_MINOR_RAWMIDIS;
+ rmidi = snd_lookup_minor_data(iminor(inode),
+ SNDRV_DEVICE_TYPE_RAWMIDI);
#ifdef CONFIG_SND_OSSEMUL
} else if (maj == SOUND_MAJOR) {
- cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
- cardnum %= SNDRV_CARDS;
- device = SNDRV_MINOR_OSS_DEVICE(iminor(inode)) == SNDRV_MINOR_OSS_MIDI ?
- midi_map[cardnum] : amidi_map[cardnum];
+ rmidi = snd_lookup_oss_minor_data(iminor(inode),
+ SNDRV_OSS_DEVICE_TYPE_MIDI);
#endif
} else
return -ENXIO;
- rmidi = snd_rawmidi_devices[(cardnum * SNDRV_RAWMIDI_DEVICES) + device];
if (rmidi == NULL)
return -ENODEV;
-#ifdef CONFIG_SND_OSSEMUL
- if (maj == SOUND_MAJOR && !rmidi->ossreg)
- return -ENXIO;
-#endif
if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
return -EINVAL; /* invalid combination */
card = rmidi->card;
@@ -430,7 +434,8 @@
}
}
up_read(&card->controls_rwsem);
- err = snd_rawmidi_kernel_open(cardnum, device, subdevice, fflags, rawmidi_file);
+ err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device,
+ subdevice, fflags, rawmidi_file);
if (err >= 0)
break;
if (err == -EAGAIN) {
@@ -570,9 +575,10 @@
struct snd_rawmidi_str *pstr;
struct snd_rawmidi_substream *substream;
struct list_head *list;
- if (info->device >= SNDRV_RAWMIDI_DEVICES)
- return -ENXIO;
- rmidi = snd_rawmidi_devices[card->number * SNDRV_RAWMIDI_DEVICES + info->device];
+
+ down(®ister_mutex);
+ rmidi = snd_rawmidi_search(card, info->device);
+ up(®ister_mutex);
if (!rmidi)
return -ENXIO;
if (info->stream < 0 || info->stream > 1)
@@ -803,9 +809,7 @@
unsigned long arg)
{
void __user *argp = (void __user *)arg;
- unsigned int tmp;
- tmp = card->number * SNDRV_RAWMIDI_DEVICES;
switch (cmd) {
case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
{
@@ -813,14 +817,16 @@
if (get_user(device, (int __user *)argp))
return -EFAULT;
+ down(®ister_mutex);
device = device < 0 ? 0 : device + 1;
while (device < SNDRV_RAWMIDI_DEVICES) {
- if (snd_rawmidi_devices[tmp + device])
+ if (snd_rawmidi_search(card, device))
break;
device++;
}
if (device == SNDRV_RAWMIDI_DEVICES)
device = -1;
+ up(®ister_mutex);
if (put_user(device, (int __user *)argp))
return -EFAULT;
return 0;
@@ -1493,7 +1499,7 @@
static int snd_rawmidi_dev_register(struct snd_device *device)
{
- int idx, err;
+ int err;
struct snd_info_entry *entry;
char name[16];
struct snd_rawmidi *rmidi = device->device_data;
@@ -1501,25 +1507,24 @@
if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
return -ENOMEM;
down(®ister_mutex);
- idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
- if (snd_rawmidi_devices[idx] != NULL) {
+ if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
up(®ister_mutex);
return -EBUSY;
}
- snd_rawmidi_devices[idx] = rmidi;
+ list_add_tail(&rmidi->list, &snd_rawmidi_devices);
sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
rmidi->card, rmidi->device,
- &snd_rawmidi_f_ops, name)) < 0) {
+ &snd_rawmidi_f_ops, rmidi, name)) < 0) {
snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
- snd_rawmidi_devices[idx] = NULL;
+ list_del(&rmidi->list);
up(®ister_mutex);
return err;
}
if (rmidi->ops && rmidi->ops->dev_register &&
(err = rmidi->ops->dev_register(rmidi)) < 0) {
snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
- snd_rawmidi_devices[idx] = NULL;
+ list_del(&rmidi->list);
up(®ister_mutex);
return err;
}
@@ -1527,8 +1532,8 @@
rmidi->ossreg = 0;
if ((int)rmidi->device == midi_map[rmidi->card->number]) {
if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
- rmidi->card, 0,
- &snd_rawmidi_f_ops, name) < 0) {
+ rmidi->card, 0, &snd_rawmidi_f_ops,
+ rmidi, name) < 0) {
snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
} else {
rmidi->ossreg++;
@@ -1539,8 +1544,8 @@
}
if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
- rmidi->card, 1,
- &snd_rawmidi_f_ops, name) < 0) {
+ rmidi->card, 1, &snd_rawmidi_f_ops,
+ rmidi, name) < 0) {
snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
} else {
rmidi->ossreg++;
@@ -1576,24 +1581,20 @@
static int snd_rawmidi_dev_disconnect(struct snd_device *device)
{
struct snd_rawmidi *rmidi = device->device_data;
- int idx;
down(®ister_mutex);
- idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
- snd_rawmidi_devices[idx] = NULL;
+ list_del_init(&rmidi->list);
up(®ister_mutex);
return 0;
}
static int snd_rawmidi_dev_unregister(struct snd_device *device)
{
- int idx;
struct snd_rawmidi *rmidi = device->device_data;
snd_assert(rmidi != NULL, return -ENXIO);
down(®ister_mutex);
- idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
- snd_rawmidi_devices[idx] = NULL;
+ list_del(&rmidi->list);
if (rmidi->proc_entry) {
snd_info_unregister(rmidi->proc_entry);
rmidi->proc_entry = NULL;
diff --git a/sound/core/seq/oss/seq_oss.c b/sound/core/seq/oss/seq_oss.c
index 61c0a41..4b51ab5 100644
--- a/sound/core/seq/oss/seq_oss.c
+++ b/sound/core/seq/oss/seq_oss.c
@@ -225,7 +225,7 @@
down(®ister_mutex);
if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
NULL, 0,
- &seq_oss_f_ops,
+ &seq_oss_f_ops, NULL,
SNDRV_SEQ_OSS_DEVNAME)) < 0) {
snd_printk(KERN_ERR "can't register device seq\n");
up(®ister_mutex);
@@ -233,7 +233,7 @@
}
if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
NULL, 0,
- &seq_oss_f_ops,
+ &seq_oss_f_ops, NULL,
SNDRV_SEQ_OSS_DEVNAME)) < 0) {
snd_printk(KERN_ERR "can't register device music\n");
snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);
diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index 087fdf3..c8bd37e 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -2531,7 +2531,7 @@
return -ERESTARTSYS;
if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
- &snd_seq_f_ops, "seq")) < 0) {
+ &snd_seq_f_ops, NULL, "seq")) < 0) {
up(®ister_mutex);
return err;
}
diff --git a/sound/core/seq/seq_midi.c b/sound/core/seq/seq_midi.c
index f88d2e3..0a65eb2 100644
--- a/sound/core/seq/seq_midi.c
+++ b/sound/core/seq/seq_midi.c
@@ -183,7 +183,10 @@
struct snd_rawmidi_params params;
/* open midi port */
- if ((err = snd_rawmidi_kernel_open(msynth->card->number, msynth->device, msynth->subdevice, SNDRV_RAWMIDI_LFLG_INPUT, &msynth->input_rfile)) < 0) {
+ if ((err = snd_rawmidi_kernel_open(msynth->card, msynth->device,
+ msynth->subdevice,
+ SNDRV_RAWMIDI_LFLG_INPUT,
+ &msynth->input_rfile)) < 0) {
snd_printd("midi input open failed!!!\n");
return err;
}
@@ -221,7 +224,10 @@
struct snd_rawmidi_params params;
/* open midi port */
- if ((err = snd_rawmidi_kernel_open(msynth->card->number, msynth->device, msynth->subdevice, SNDRV_RAWMIDI_LFLG_OUTPUT, &msynth->output_rfile)) < 0) {
+ if ((err = snd_rawmidi_kernel_open(msynth->card, msynth->device,
+ msynth->subdevice,
+ SNDRV_RAWMIDI_LFLG_OUTPUT,
+ &msynth->output_rfile)) < 0) {
snd_printd("midi output open failed!!!\n");
return err;
}
diff --git a/sound/core/sound.c b/sound/core/sound.c
index a509f49..1e5eca5 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -60,7 +60,6 @@
int snd_ecards_limit;
static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
-
static DECLARE_MUTEX(sound_mutex);
extern struct class *sound_class;
@@ -107,6 +106,31 @@
#endif /* request_module support */
+/**
+ * snd_lookup_minor_data - get user data of a registered device
+ * @minor: the minor number
+ * @type: device type (SNDRV_DEVICE_TYPE_XXX)
+ *
+ * Checks that a minor device with the specified type is registered, and returns
+ * its user data pointer.
+ */
+void *snd_lookup_minor_data(unsigned int minor, int type)
+{
+ struct snd_minor *mreg;
+ void *private_data;
+
+ if (minor > ARRAY_SIZE(snd_minors))
+ return NULL;
+ down(&sound_mutex);
+ mreg = snd_minors[minor];
+ if (mreg && mreg->type == type)
+ private_data = mreg->private_data;
+ else
+ private_data = NULL;
+ up(&sound_mutex);
+ return private_data;
+}
+
static int snd_open(struct inode *inode, struct file *file)
{
int minor = iminor(inode);
@@ -183,6 +207,7 @@
* @card: the card instance
* @dev: the device index
* @f_ops: the file operations
+ * @private_data: user pointer for f_ops->open()
* @name: the device file name
*
* Registers an ALSA device file for the given card.
@@ -191,7 +216,8 @@
* Retrurns zero if successful, or a negative error code on failure.
*/
int snd_register_device(int type, struct snd_card *card, int dev,
- struct file_operations *f_ops, const char *name)
+ struct file_operations *f_ops, void *private_data,
+ const char *name)
{
int minor = snd_kernel_minor(type, card, dev);
struct snd_minor *preg;
@@ -207,6 +233,7 @@
preg->card = card ? card->number : -1;
preg->device = dev;
preg->f_ops = f_ops;
+ preg->private_data = private_data;
strcpy(preg->name, name);
down(&sound_mutex);
if (snd_minors[minor]) {
@@ -238,13 +265,18 @@
*/
int snd_unregister_device(int type, struct snd_card *card, int dev)
{
- int minor = snd_kernel_minor(type, card, dev);
+ int cardnum, minor;
struct snd_minor *mptr;
- if (minor < 0)
- return minor;
+ cardnum = card ? card->number : -1;
down(&sound_mutex);
- if ((mptr = snd_minors[minor]) == NULL) {
+ for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
+ if ((mptr = snd_minors[minor]) != NULL &&
+ mptr->type == type &&
+ mptr->card == cardnum &&
+ mptr->device == dev)
+ break;
+ if (minor == ARRAY_SIZE(snd_minors)) {
up(&sound_mutex);
return -EINVAL;
}
@@ -392,9 +424,11 @@
#endif
EXPORT_SYMBOL(snd_register_device);
EXPORT_SYMBOL(snd_unregister_device);
+EXPORT_SYMBOL(snd_lookup_minor_data);
#if defined(CONFIG_SND_OSSEMUL)
EXPORT_SYMBOL(snd_register_oss_device);
EXPORT_SYMBOL(snd_unregister_oss_device);
+EXPORT_SYMBOL(snd_lookup_oss_minor_data);
#endif
/* memory.c */
EXPORT_SYMBOL(copy_to_user_fromio);
diff --git a/sound/core/sound_oss.c b/sound/core/sound_oss.c
index afbfd8d..b9e89ca 100644
--- a/sound/core/sound_oss.c
+++ b/sound/core/sound_oss.c
@@ -38,9 +38,25 @@
#define SNDRV_OSS_MINORS 128
static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
-
static DECLARE_MUTEX(sound_oss_mutex);
+void *snd_lookup_oss_minor_data(unsigned int minor, int type)
+{
+ struct snd_minor *mreg;
+ void *private_data;
+
+ if (minor > ARRAY_SIZE(snd_oss_minors))
+ return NULL;
+ down(&sound_oss_mutex);
+ mreg = snd_oss_minors[minor];
+ if (mreg && mreg->type == type)
+ private_data = mreg->private_data;
+ else
+ private_data = NULL;
+ up(&sound_oss_mutex);
+ return private_data;
+}
+
static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
{
int minor;
@@ -78,7 +94,8 @@
}
int snd_register_oss_device(int type, struct snd_card *card, int dev,
- struct file_operations *f_ops, const char *name)
+ struct file_operations *f_ops, void *private_data,
+ const char *name)
{
int minor = snd_oss_kernel_minor(type, card, dev);
int minor_unit;
@@ -97,6 +114,7 @@
preg->card = card ? card->number : -1;
preg->device = dev;
preg->f_ops = f_ops;
+ preg->private_data = private_data;
down(&sound_oss_mutex);
snd_oss_minors[minor] = preg;
minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
@@ -121,6 +139,7 @@
carddev);
if (register2 != track2)
goto __end;
+ snd_oss_minors[track2] = preg;
}
up(&sound_oss_mutex);
return 0;
@@ -163,8 +182,10 @@
track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
break;
}
- if (track2 >= 0)
+ if (track2 >= 0) {
unregister_sound_special(track2);
+ snd_oss_minors[track2] = NULL;
+ }
snd_oss_minors[minor] = NULL;
up(&sound_oss_mutex);
kfree(mptr);
diff --git a/sound/core/timer.c b/sound/core/timer.c
index a7bcb04..c62dbac 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1952,8 +1952,8 @@
if ((err = snd_timer_register_system()) < 0)
snd_printk(KERN_ERR "unable to register system timer (%i)\n",
err);
- if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
- NULL, 0, &snd_timer_f_ops, "timer")) < 0)
+ if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER, NULL, 0,
+ &snd_timer_f_ops, NULL, "timer")) < 0)
snd_printk(KERN_ERR "unable to register timer device (%i)\n",
err);
return 0;
