C++ (Cpp) snd_card_file_add Examples

Example #1

File: mixer_oss.c Project: Core2idiot/Kernel-Samsung-3.0...-

static int snd_mixer_oss_open(struct inode *inode, struct file *file)
{
	struct snd_card *card;
	struct snd_mixer_oss_file *fmixer;
	int err;

	err = nonseekable_open(inode, file);
	if (err < 0)
		return err;

	card = snd_lookup_oss_minor_data(iminor(inode),
					 SNDRV_OSS_DEVICE_TYPE_MIXER);
	if (card == NULL)
		return -ENODEV;
	if (card->mixer_oss == NULL)
		return -ENODEV;
	err = snd_card_file_add(card, file);
	if (err < 0)
		return err;
	fmixer = kzalloc(sizeof(*fmixer), GFP_KERNEL);
	if (fmixer == NULL) {
		snd_card_file_remove(card, file);
		return -ENOMEM;
	}
	fmixer->card = card;
	fmixer->mixer = card->mixer_oss;
	file->private_data = fmixer;
	if (!try_module_get(card->module)) {
		kfree(fmixer);
		snd_card_file_remove(card, file);
		return -EFAULT;
	}
	return 0;
}

Example #2

File: hwdep.c Project: Nothing-Dev/android_kernel_lge_jagnm_lp

static int snd_hwdep_open(struct inode *inode, struct file * file)
{
	int major = imajor(inode);
	struct snd_hwdep *hw;
	int err;
	wait_queue_t wait;

	if (major == snd_major) {
		hw = snd_lookup_minor_data(iminor(inode),
					   SNDRV_DEVICE_TYPE_HWDEP);
#ifdef CONFIG_SND_OSSEMUL
	} else if (major == SOUND_MAJOR) {
		hw = snd_lookup_oss_minor_data(iminor(inode),
					       SNDRV_OSS_DEVICE_TYPE_DMFM);
#endif
	} else
		return -ENXIO;
	if (hw == NULL)
		return -ENODEV;

	if (!try_module_get(hw->card->module)) {
		return -EFAULT;
	}

	init_waitqueue_entry(&wait, current);
	add_wait_queue(&hw->open_wait, &wait);
	mutex_lock(&hw->open_mutex);
	while (1) {
		if (hw->exclusive && hw->used > 0) {
			err = -EBUSY;
			break;
		}
		if (!hw->ops.open) {
			err = 0;
			break;
		}
		err = hw->ops.open(hw, file);
		if (err >= 0)
			break;
		if (err == -EAGAIN) {
			if (file->f_flags & O_NONBLOCK) {
				err = -EBUSY;
				break;
			}
		} else
			break;
		set_current_state(TASK_INTERRUPTIBLE);
		mutex_unlock(&hw->open_mutex);
		schedule();
		mutex_lock(&hw->open_mutex);
		if (hw->card->shutdown) {
			err = -ENODEV;
			break;
		}
		if (signal_pending(current)) {
			err = -ERESTARTSYS;
			break;
		}
	}
	remove_wait_queue(&hw->open_wait, &wait);
	if (err >= 0) {
		err = snd_card_file_add(hw->card, file);
		if (err >= 0) {
			file->private_data = hw;
			hw->used++;
		} else {
			if (hw->ops.release)
				hw->ops.release(hw, file);
		}
	}
	mutex_unlock(&hw->open_mutex);
	if (err < 0)
		module_put(hw->card->module);
	return err;
}

Example #3

File: hwdep.c Project: BackupTheBerlios/tew632-brp-svn

static int snd_hwdep_open(struct inode *inode, struct file * file)
{
	int major = imajor(inode);
	int cardnum;
	int device;
	snd_hwdep_t *hw;
	int err;
	wait_queue_t wait;

	if (major == snd_major) {
		cardnum = SNDRV_MINOR_CARD(iminor(inode));
		device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_HWDEP;
#ifdef CONFIG_SND_OSSEMUL
	} else if (major == SOUND_MAJOR) {
		cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
		device = 0;
#endif
	} else
		return -ENXIO;
	cardnum %= SNDRV_CARDS;
	device %= SNDRV_MINOR_HWDEPS;
	hw = snd_hwdep_devices[(cardnum * SNDRV_MINOR_HWDEPS) + device];
	if (hw == NULL)
		return -ENODEV;

	if (!hw->ops.open)
		return -ENXIO;
#ifdef CONFIG_SND_OSSEMUL
	if (major == SOUND_MAJOR && hw->oss_type < 0)
		return -ENXIO;
#endif

	if (!try_module_get(hw->card->module))
		return -EFAULT;

	init_waitqueue_entry(&wait, current);
	add_wait_queue(&hw->open_wait, &wait);
	down(&hw->open_mutex);
	while (1) {
		if (hw->exclusive && hw->used > 0) {
			err = -EBUSY;
			break;
		}
		err = hw->ops.open(hw, file);
		if (err >= 0)
			break;
		if (err == -EAGAIN) {
			if (file->f_flags & O_NONBLOCK) {
				err = -EBUSY;
				break;
			}
		} else
			break;
		set_current_state(TASK_INTERRUPTIBLE);
		up(&hw->open_mutex);
		schedule();
		down(&hw->open_mutex);
		if (signal_pending(current)) {
			err = -ERESTARTSYS;
			break;
		}
	}
	remove_wait_queue(&hw->open_wait, &wait);
	if (err >= 0) {
		err = snd_card_file_add(hw->card, file);
		if (err >= 0) {
			file->private_data = hw;
			hw->used++;
		} else {
			if (hw->ops.release)
				hw->ops.release(hw, file);
		}
	}
	up(&hw->open_mutex);
	if (err < 0)
		module_put(hw->card->module);
	return err;
}