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ALSA: info: Add standard helpers for card proc file entries

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Two new helper functions are added here for cleaning up the existing
lengthy calls.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2019-02-04 14:53:04 +01:00
parent eaffef0d5f
commit 7453e1dafd
2 changed files with 67 additions and 0 deletions
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35
include/sound/info.h
View File

@ -160,6 +160,13 @@ static inline void snd_info_set_text_ops(struct snd_info_entry *entry,
entry->c.text.read = read; entry->c.text.read = read;
} }
int snd_card_rw_proc_new(struct snd_card *card, const char *name,
void *private_data,
void (*read)(struct snd_info_entry *,
struct snd_info_buffer *),
void (*write)(struct snd_info_entry *entry,
struct snd_info_buffer *buffer));
int snd_info_check_reserved_words(const char *str); int snd_info_check_reserved_words(const char *str);
#else #else
@ -189,10 +196,38 @@ static inline int snd_card_proc_new(struct snd_card *card, const char *name,
static inline void snd_info_set_text_ops(struct snd_info_entry *entry __attribute__((unused)), static inline void snd_info_set_text_ops(struct snd_info_entry *entry __attribute__((unused)),
void *private_data, void *private_data,
void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) {} void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) {}
static inline int snd_card_rw_proc_new(struct snd_card *card, const char *name,
void *private_data,
void (*read)(struct snd_info_entry *,
struct snd_info_buffer *),
void (*write)(struct snd_info_entry *entry,
struct snd_info_buffer *buffer))
{
return 0;
}
static inline int snd_info_check_reserved_words(const char *str) { return 1; } static inline int snd_info_check_reserved_words(const char *str) { return 1; }
#endif #endif
/**
* snd_card_ro_proc_new - Create a read-only text proc file entry for the card
* @card: the card instance
* @name: the file name
* @private_data: the arbitrary private data
* @read: the read callback
*
* This proc file entry will be registered via snd_card_register() call, and
* it will be removed automatically at the card removal, too.
*/
static inline int
snd_card_ro_proc_new(struct snd_card *card, const char *name,
void *private_data,
void (*read)(struct snd_info_entry *,
struct snd_info_buffer *))
{
return snd_card_rw_proc_new(card, name, private_data, read, NULL);
}
/* /*
* OSS info part * OSS info part
*/ */

32
sound/core/info.c
View File

@ -866,6 +866,38 @@ int snd_info_register(struct snd_info_entry *entry)
} }
EXPORT_SYMBOL(snd_info_register); EXPORT_SYMBOL(snd_info_register);
/**
* snd_card_rw_proc_new - Create a read/write text proc file entry for the card
* @card: the card instance
* @name: the file name
* @private_data: the arbitrary private data
* @read: the read callback
* @write: the write callback, NULL for read-only
*
* This proc file entry will be registered via snd_card_register() call, and
* it will be removed automatically at the card removal, too.
*/
int snd_card_rw_proc_new(struct snd_card *card, const char *name,
void *private_data,
void (*read)(struct snd_info_entry *,
struct snd_info_buffer *),
void (*write)(struct snd_info_entry *entry,
struct snd_info_buffer *buffer))
{
struct snd_info_entry *entry;
entry = snd_info_create_card_entry(card, name, card->proc_root);
if (!entry)
return -ENOMEM;
snd_info_set_text_ops(entry, private_data, read);
if (write) {
entry->mode |= 0200;
entry->c.text.write = write;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_card_rw_proc_new);
/* /*
*/ */