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ALSA: Core - add snd_card_set_id() function

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Introduce snd_card_set_id() function to allow lowlevel drivers to set
default identification name for card slot. The function checks also
for identification name collisions and tries to create unique name.

Also, the snd_card_create() function is simplified, because this new
function is used. As bonus, proper name collision checks are evaluated
at the card create time.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Jaroslav Kysela 2009-06-02 12:02:38 +02:00 • committed by Takashi Iwai
parent 3218911f83
commit 10a8ebbb08
2 changed files with 40 additions and 23 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
include/sound/core.h
View file

@ -313,6 +313,7 @@ struct snd_card *snd_card_new(int idx, const char *id,
int snd_card_disconnect(struct snd_card *card);
int snd_card_free(struct snd_card *card);
int snd_card_free_when_closed(struct snd_card *card);
void snd_card_set_id(struct snd_card *card, const char *id);
int snd_card_register(struct snd_card *card);
int snd_card_info_init(void);
int snd_card_info_done(void);

54
sound/core/init.c
View file

@ -152,15 +152,8 @@ int snd_card_create(int idx, const char *xid,
card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
if (!card)
return -ENOMEM;
if (xid) {
if (!snd_info_check_reserved_words(xid)) {
snd_printk(KERN_ERR
"given id string '%s' is reserved.\n", xid);
err = -EBUSY;
goto __error;
}
strlcpy(card->id, xid, sizeof(card->id));
}
if (xid)
snd_card_set_id(card, xid);
err = 0;
mutex_lock(&snd_card_mutex);
if (idx < 0) {
@ -483,22 +476,39 @@ int snd_card_free(struct snd_card *card)
EXPORT_SYMBOL(snd_card_free);
static void choose_default_id(struct snd_card *card)
/**
* snd_card_set_id - set card identification name
* @card: soundcard structure
* @nid: new identification string
*
* This function sets the card identification and checks for name
* collisions.
*/
void snd_card_set_id(struct snd_card *card, const char *nid)
{
int i, len, idx_flag = 0, loops = SNDRV_CARDS;
char *id, *spos;
const char *spos, *src;
char *id;
id = spos = card->shortname;
/* check if user specified own card->id */
if (card->id[0] != '\0')
return;
if (nid == NULL) {
id = card->shortname;
spos = src = id;
while (*id != '\0') {
if (*id == ' ')
spos = id + 1;
id++;
}
} else {
spos = src = nid;
}
id = card->id;
while (*spos != '\0' && !isalnum(*spos))
spos++;
if (isdigit(*spos))
*id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D';
*id++ = isalpha(src[0]) ? src[0] : 'D';
while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) {
if (isalnum(*spos))
*id++ = *spos;
@ -513,16 +523,20 @@ static void choose_default_id(struct snd_card *card)
while (1) {
if (loops-- == 0) {
snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id);
snd_printk(KERN_ERR "unable to set card id (%s)\n", id);
strcpy(card->id, card->proc_root->name);
return;
}
if (!snd_info_check_reserved_words(id))
goto __change;
mutex_lock(&snd_card_mutex);
for (i = 0; i < snd_ecards_limit; i++) {
if (snd_cards[i] && !strcmp(snd_cards[i]->id, id))
if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) {
mutex_unlock(&snd_card_mutex);
goto __change;
}
}
mutex_unlock(&snd_card_mutex);
break;
__change:
@ -539,14 +553,16 @@ static void choose_default_id(struct snd_card *card)
spos = id + len - 2;
if ((size_t)len <= sizeof(card->id) - 2)
spos++;
*spos++ = '_';
*spos++ = '1';
*spos++ = '\0';
*(char *)spos++ = '_';
*(char *)spos++ = '1';
*(char *)spos++ = '\0';
idx_flag++;
}
}
}
EXPORT_SYMBOL(snd_card_set_id);
#ifndef CONFIG_SYSFS_DEPRECATED
static ssize_t
card_id_show_attr(struct device *dev,
@ -641,7 +657,7 @@ int snd_card_register(struct snd_card *card)
return 0;
}
if (card->id[0] == '\0')
choose_default_id(card);
snd_card_set_id(card, NULL);
snd_cards[card->number] = card;
mutex_unlock(&snd_card_mutex);
init_info_for_card(card);