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ALSA: hda - Add hints for reconfig 

This patch adds the "hints" for reconfiguring codecs.  The hints
are simply string arrays and can be freely used/parsed by the codec
patch.  The hints can be input via hwdep sysfs files.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2008-07-30 15:01:46 +02:00
parent 11aeff082a
commit 1e1be4329f
2 changed files with 35 additions and 0 deletions
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1
sound/pci/hda/hda_codec.h
View File

@ -754,6 +754,7 @@ struct hda_codec {
#ifdef CONFIG_SND_HDA_HWDEP
struct snd_hwdep *hwdep; /* assigned hwdep device */
struct snd_array init_verbs; /* additional init verbs */
struct snd_array hints; /* additional hints */
#endif
/* misc flags */

34
sound/pci/hda/hda_hwdep.c
View File

@ -23,6 +23,7 @@
#include <linux/pci.h>
#include <linux/compat.h>
#include <linux/mutex.h>
#include <linux/ctype.h>
#include <sound/core.h>
#include "hda_codec.h"
#include "hda_local.h"
@ -98,8 +99,16 @@ static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
static void clear_hwdep_elements(struct hda_codec *codec)
{
char **head;
int i;
/* clear init verbs */
snd_array_free(&codec->init_verbs);
/* clear hints */
head = codec->hints.list;
for (i = 0; i < codec->hints.used; i++, head++)
kfree(*head);
snd_array_free(&codec->hints);
}
static void hwdep_free(struct snd_hwdep *hwdep)
@ -131,6 +140,7 @@ int __devinit snd_hda_create_hwdep(struct hda_codec *codec)
#endif
snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
snd_array_init(&codec->hints, sizeof(char *), 32);
return 0;
}
@ -280,6 +290,29 @@ static ssize_t init_verbs_store(struct device *dev,
return count;
}
static ssize_t hints_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct snd_hwdep *hwdep = dev_get_drvdata(dev);
struct hda_codec *codec = hwdep->private_data;
char *p;
char **hint;
if (!*buf || isspace(*buf) || *buf == '#' || *buf == '\n')
return count;
p = kstrndup_noeol(buf, 1024);
if (!p)
return -ENOMEM;
hint = snd_array_new(&codec->hints);
if (!hint) {
kfree(p);
return -ENOMEM;
}
*hint = p;
return count;
}
#define CODEC_ATTR_RW(type) \
__ATTR(type, 0644, type##_show, type##_store)
#define CODEC_ATTR_RO(type) \
@ -296,6 +329,7 @@ static struct device_attribute codec_attrs[] = {
CODEC_ATTR_RW(name),
CODEC_ATTR_RW(modelname),
CODEC_ATTR_WO(init_verbs),
CODEC_ATTR_WO(hints),
CODEC_ATTR_WO(reconfig),
CODEC_ATTR_WO(clear),
};