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[ALSA] dynamic minors (6/6): increase maximum number of sound cards

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Modules: ALSA Core,Memalloc module,ALSA sequencer

With dynamic minor numbers, we can increase the number of sound cards.

This requires that the sequencer client numbers of some kernel drivers
are allocated dynamically, too.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2005-11-20 14:09:05 +01:00 committed by Jaroslav Kysela
parent 204bdb1b50
commit d001544ded
6 changed files with 49 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/sound/driver.h
View File

@ -28,7 +28,12 @@
#include <linux/config.h>
#define SNDRV_CARDS 8 /* number of supported soundcards - don't change - minor numbers */
/* number of supported soundcards */
#ifdef CONFIG_SND_DYNAMIC_MINORS
#define SNDRV_CARDS 32
#else
#define SNDRV_CARDS 8 /* don't change - minor numbers */
#endif
#ifndef CONFIG_SND_MAJOR /* standard configuration */
#define CONFIG_SND_MAJOR 116

18
sound/core/init.c
View File

@ -338,7 +338,7 @@ int snd_card_free_in_thread(struct snd_card *card)
static void choose_default_id(struct snd_card *card)
{
int i, len, idx_flag = 0, loops = 8;
int i, len, idx_flag = 0, loops = SNDRV_CARDS;
char *id, *spos;
id = spos = card->shortname;
@ -380,9 +380,12 @@ static void choose_default_id(struct snd_card *card)
__change:
len = strlen(id);
if (idx_flag)
id[len-1]++;
else if ((size_t)len <= sizeof(card->id) - 3) {
if (idx_flag) {
if (id[len-1] != '9')
id[len-1]++;
else
id[len-1] = 'A';
} else if ((size_t)len <= sizeof(card->id) - 3) {
strcat(id, "_1");
idx_flag++;
} else {
@ -461,12 +464,12 @@ static void snd_card_info_read(struct snd_info_entry *entry,
read_lock(&snd_card_rwlock);
if ((card = snd_cards[idx]) != NULL) {
count++;
snd_iprintf(buffer, "%i [%-15s]: %s - %s\n",
snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
idx,
card->id,
card->driver,
card->shortname);
snd_iprintf(buffer, " %s\n",
snd_iprintf(buffer, " %s\n",
card->longname);
}
read_unlock(&snd_card_rwlock);
@ -508,7 +511,8 @@ static void snd_card_module_info_read(struct snd_info_entry *entry,
for (idx = 0; idx < SNDRV_CARDS; idx++) {
read_lock(&snd_card_rwlock);
if ((card = snd_cards[idx]) != NULL)
snd_iprintf(buffer, "%i %s\n", idx, card->module->name);
snd_iprintf(buffer, "%2i %s\n",
idx, card->module->name);
read_unlock(&snd_card_rwlock);
}
}

4
sound/core/memalloc.c
View File

@ -43,10 +43,6 @@ MODULE_DESCRIPTION("Memory allocator for ALSA system.");
MODULE_LICENSE("GPL");
#ifndef SNDRV_CARDS
#define SNDRV_CARDS 8
#endif
/*
*/

31
sound/core/seq/seq_clientmgr.c
View File

@ -47,6 +47,10 @@
*
*/
/* range for dynamically allocated client numbers of kernel drivers */
#define SNDRV_SEQ_DYNAMIC_CLIENT_BEGIN 16
#define SNDRV_SEQ_DYNAMIC_CLIENT_END 48
#define SNDRV_SEQ_LFLG_INPUT 0x0001
#define SNDRV_SEQ_LFLG_OUTPUT 0x0002
#define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
@ -203,7 +207,8 @@ int __init client_init_data(void)
}
static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
static struct snd_seq_client *seq_create_client1(int client_index, int poolsize,
int kernel_client)
{
unsigned long flags;
int c;
@ -227,7 +232,15 @@ static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
/* find free slot in the client table */
spin_lock_irqsave(&clients_lock, flags);
if (client_index < 0) {
for (c = 128; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
int cmin, cmax;
if (kernel_client) {
cmin = SNDRV_SEQ_DYNAMIC_CLIENT_BEGIN;
cmax = SNDRV_SEQ_DYNAMIC_CLIENT_END;
} else {
cmin = 128;
cmax = SNDRV_SEQ_MAX_CLIENTS;
}
for (c = cmin; c < cmax; c++) {
if (clienttab[c] || clienttablock[c])
continue;
clienttab[client->number = c] = client;
@ -306,7 +319,7 @@ static int snd_seq_open(struct inode *inode, struct file *file)
if (down_interruptible(&register_mutex))
return -ERESTARTSYS;
client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS, 0);
if (client == NULL) {
up(&register_mutex);
return -ENOMEM; /* failure code */
@ -2212,13 +2225,19 @@ int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
return -EINVAL;
if (card == NULL && client_index > 63)
return -EINVAL;
if (card)
client_index += 64 + (card->number << 2);
if (down_interruptible(&register_mutex))
return -ERESTARTSYS;
if (card) {
if (card->number < 16)
client_index += 64 + (card->number << 2);
else
client_index = -1;
}
/* empty write queue as default */
client = seq_create_client1(client_index, 0);
client = seq_create_client1(client_index, 0, 1);
if (client == NULL) {
up(&register_mutex);
return -EBUSY; /* failure code */

6
sound/core/sound.c
View File

@ -358,15 +358,15 @@ static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_bu
continue;
if (mptr->card >= 0) {
if (mptr->device >= 0)
snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n",
snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
minor, mptr->card, mptr->device,
snd_device_type_name(mptr->type));
else
snd_iprintf(buffer, "%3i: [%i] : %s\n",
snd_iprintf(buffer, "%3i: [%2i] : %s\n",
minor, mptr->card,
snd_device_type_name(mptr->type));
} else
snd_iprintf(buffer, "%3i: : %s\n", minor,
snd_iprintf(buffer, "%3i: : %s\n", minor,
snd_device_type_name(mptr->type));
}
up(&sound_mutex);

4
sound/core/sound_oss.c
View File

@ -105,6 +105,8 @@ int snd_register_oss_device(int type, struct snd_card *card, int dev,
int register1 = -1, register2 = -1;
struct device *carddev = NULL;
if (card && card->number >= 8)
return 0; /* ignore silently */
if (minor < 0)
return minor;
preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
@ -162,6 +164,8 @@ int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
int track2 = -1;
struct snd_minor *mptr;
if (card && card->number >= 8)
return 0;
if (minor < 0)
return minor;
down(&sound_oss_mutex);