From 9d19f48cfe2570562c2c6226780a7ca627b0f1f1 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 6 Sep 2006 14:27:46 +0200 Subject: [ALSA] Add pcm_class attribute to PCM sysfs entry This patch adds a new attribute, pcm_class, to each PCM sysfs entry. It's useful to detect what kind of PCM stream is, for example, HAL can check whether it's a modem or not. Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela --- sound/core/sound.c | 56 ++++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 44 insertions(+), 12 deletions(-) (limited to 'sound/core/sound.c') diff --git a/sound/core/sound.c b/sound/core/sound.c index b4430db3fa4..efa476c5210 100644 --- a/sound/core/sound.c +++ b/sound/core/sound.c @@ -268,7 +268,11 @@ int snd_register_device(int type, struct snd_card *card, int dev, snd_minors[minor] = preg; if (card) device = card->dev; - class_device_create(sound_class, NULL, MKDEV(major, minor), device, "%s", name); + preg->class_dev = class_device_create(sound_class, NULL, + MKDEV(major, minor), + device, "%s", name); + if (preg->class_dev) + class_set_devdata(preg->class_dev, private_data); mutex_unlock(&sound_mutex); return 0; @@ -276,6 +280,24 @@ int snd_register_device(int type, struct snd_card *card, int dev, EXPORT_SYMBOL(snd_register_device); +/* find the matching minor record + * return the index of snd_minor, or -1 if not found + */ +static int find_snd_minor(int type, struct snd_card *card, int dev) +{ + int cardnum, minor; + struct snd_minor *mptr; + + cardnum = card ? card->number : -1; + for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) + if ((mptr = snd_minors[minor]) != NULL && + mptr->type == type && + mptr->card == cardnum && + mptr->device == dev) + return minor; + return -1; +} + /** * snd_unregister_device - unregister the device on the given card * @type: the device type, SNDRV_DEVICE_TYPE_XXX @@ -289,32 +311,42 @@ EXPORT_SYMBOL(snd_register_device); */ int snd_unregister_device(int type, struct snd_card *card, int dev) { - int cardnum, minor; - struct snd_minor *mptr; + int minor; - cardnum = card ? card->number : -1; mutex_lock(&sound_mutex); - for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) - if ((mptr = snd_minors[minor]) != NULL && - mptr->type == type && - mptr->card == cardnum && - mptr->device == dev) - break; - if (minor == ARRAY_SIZE(snd_minors)) { + minor = find_snd_minor(type, card, dev); + if (minor < 0) { mutex_unlock(&sound_mutex); return -EINVAL; } class_device_destroy(sound_class, MKDEV(major, minor)); + kfree(snd_minors[minor]); snd_minors[minor] = NULL; mutex_unlock(&sound_mutex); - kfree(mptr); return 0; } EXPORT_SYMBOL(snd_unregister_device); +int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev, + const struct class_device_attribute *attr) +{ + int minor, ret = -EINVAL; + struct class_device *cdev; + + mutex_lock(&sound_mutex); + minor = find_snd_minor(type, card, dev); + if (minor >= 0 && (cdev = snd_minors[minor]->class_dev) != NULL) + ret = class_device_create_file(cdev, attr); + mutex_unlock(&sound_mutex); + return ret; + +} + +EXPORT_SYMBOL(snd_add_device_sysfs_file); + #ifdef CONFIG_PROC_FS /* * INFO PART -- cgit v1.2.3