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ALSA: hwdep: Embed struct device 

Like the previous patch, this one embeds the device object into hwdep
object.  For a proper object lifecycle, it's freed in the release
callback.

This also allows us to create sysfs entries via passing to the groups
field of the device without explicit function calls.  Since each
driver can see the device and touch its groups field directly, we
don't need to delegate in hwdep core any longer.  So, remove the
groups field from snd_hwdep, and let the user (in this case only
hda_hwdep.c) modify the device groups.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-01-29 17:13:32 +01:00
parent 0fcd9f4b3c
commit 7b46160000
3 changed files with 38 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/sound/hwdep.h
View File

@ -68,8 +68,7 @@ struct snd_hwdep {
wait_queue_head_t open_wait;
void *private_data;
void (*private_free) (struct snd_hwdep *hwdep);
struct device *dev;
const struct attribute_group **groups;
struct device dev;
struct mutex open_mutex;
int used; /* reference counter */

82
sound/core/hwdep.c
View File

@ -38,7 +38,6 @@ MODULE_LICENSE("GPL");
static LIST_HEAD(snd_hwdep_devices);
static DEFINE_MUTEX(register_mutex);
static int snd_hwdep_free(struct snd_hwdep *hwdep);
static int snd_hwdep_dev_free(struct snd_device *device);
static int snd_hwdep_dev_register(struct snd_device *device);
static int snd_hwdep_dev_disconnect(struct snd_device *device);
@ -345,6 +344,11 @@ static const struct file_operations snd_hwdep_f_ops =
.mmap = snd_hwdep_mmap,
};
static void release_hwdep_device(struct device *dev)
{
kfree(container_of(dev, struct snd_hwdep, dev));
}
/**
* snd_hwdep_new - create a new hwdep instance
* @card: the card instance
@ -378,48 +382,49 @@ int snd_hwdep_new(struct snd_card *card, char *id, int device,
dev_err(card->dev, "hwdep: cannot allocate\n");
return -ENOMEM;
}
init_waitqueue_head(&hwdep->open_wait);
mutex_init(&hwdep->open_mutex);
hwdep->card = card;
hwdep->device = device;
if (id)
strlcpy(hwdep->id, id, sizeof(hwdep->id));
snd_device_initialize(&hwdep->dev, card);
hwdep->dev.release = release_hwdep_device;
dev_set_name(&hwdep->dev, "hwC%iD%i", card->number, device);
#ifdef CONFIG_SND_OSSEMUL
hwdep->oss_type = -1;
#endif
if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) {
snd_hwdep_free(hwdep);
err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops);
if (err < 0) {
put_device(&hwdep->dev);
return err;
}
init_waitqueue_head(&hwdep->open_wait);
mutex_init(&hwdep->open_mutex);
if (rhwdep)
*rhwdep = hwdep;
return 0;
}
EXPORT_SYMBOL(snd_hwdep_new);
static int snd_hwdep_free(struct snd_hwdep *hwdep)
static int snd_hwdep_dev_free(struct snd_device *device)
{
struct snd_hwdep *hwdep = device->device_data;
if (!hwdep)
return 0;
if (hwdep->private_free)
hwdep->private_free(hwdep);
kfree(hwdep);
put_device(&hwdep->dev);
return 0;
}
static int snd_hwdep_dev_free(struct snd_device *device)
{
struct snd_hwdep *hwdep = device->device_data;
return snd_hwdep_free(hwdep);
}
static int snd_hwdep_dev_register(struct snd_device *device)
{
struct snd_hwdep *hwdep = device->device_data;
struct snd_card *card = hwdep->card;
struct device *dev;
int err;
char name[32];
mutex_lock(&register_mutex);
if (snd_hwdep_search(card, hwdep->device)) {
@ -427,54 +432,31 @@ static int snd_hwdep_dev_register(struct snd_device *device)
return -EBUSY;
}
list_add_tail(&hwdep->list, &snd_hwdep_devices);
sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
dev = hwdep->dev;
if (!dev)
dev = snd_card_get_device_link(hwdep->card);
err = snd_register_device_for_dev(SNDRV_DEVICE_TYPE_HWDEP,
hwdep->card, hwdep->device,
&snd_hwdep_f_ops, hwdep,
NULL, dev, name);
&hwdep->dev, NULL, NULL);
if (err < 0) {
dev_err(dev,
"unable to register hardware dependent device %i:%i\n",
card->number, hwdep->device);
dev_err(&hwdep->dev, "unable to register\n");
list_del(&hwdep->list);
mutex_unlock(&register_mutex);
return err;
}
if (hwdep->groups) {
struct device *d = snd_get_device(SNDRV_DEVICE_TYPE_HWDEP,
hwdep->card, hwdep->device);
if (d) {
if (hwdep->private_data)
dev_set_drvdata(d, hwdep->private_data);
err = sysfs_create_groups(&d->kobj, hwdep->groups);
if (err < 0)
dev_warn(dev,
"hwdep %d:%d: cannot create sysfs groups\n",
card->number, hwdep->device);
put_device(d);
}
}
#ifdef CONFIG_SND_OSSEMUL
hwdep->ossreg = 0;
if (hwdep->oss_type >= 0) {
if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) {
dev_warn(dev,
if (hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM &&
hwdep->device)
dev_warn(&hwdep->dev,
"only hwdep device 0 can be registered as OSS direct FM device!\n");
} else {
if (snd_register_oss_device(hwdep->oss_type,
card, hwdep->device,
&snd_hwdep_f_ops, hwdep) < 0) {
dev_err(dev,
"unable to register OSS compatibility device %i:%i\n",
card->number, hwdep->device);
} else
hwdep->ossreg = 1;
}
else if (snd_register_oss_device(hwdep->oss_type,
card, hwdep->device,
&snd_hwdep_f_ops, hwdep) < 0)
dev_warn(&hwdep->dev,
"unable to register OSS compatibility device\n");
else
hwdep->ossreg = 1;
}
#endif
mutex_unlock(&register_mutex);

7
sound/pci/hda/hda_hwdep.c
View File

@ -109,7 +109,6 @@ int snd_hda_create_hwdep(struct hda_codec *codec)
hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
hwdep->private_data = codec;
hwdep->exclusive = 1;
hwdep->groups = snd_hda_dev_attr_groups;
hwdep->ops.open = hda_hwdep_open;
hwdep->ops.ioctl = hda_hwdep_ioctl;
@ -118,7 +117,11 @@ int snd_hda_create_hwdep(struct hda_codec *codec)
#endif
/* link to codec */
hwdep->dev = &codec->dev;
hwdep->dev.parent = &codec->dev;
/* for sysfs */
hwdep->dev.groups = snd_hda_dev_attr_groups;
dev_set_drvdata(&hwdep->dev, codec);
return 0;
}