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ALSA: firewire-tascam: apply small refactoring to handle several type of event for hwdep interface
In later commits, ALSA firewire-tascam driver will allow userspace applications to receive notifications about changes of device state, transferred in tx isochronous packet. At present, all of drivers in ALSA firewire stack have mechanism to notify change of status of packet streaming, thus it needs to distinguish these two types of notification. This commit is a preparation for the above. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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d716742243
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1 changed files with 26 additions and 12 deletions
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@ -16,14 +16,30 @@
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#include "tascam.h"
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static long tscm_hwdep_read_locked(struct snd_tscm *tscm, char __user *buf,
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long count, loff_t *offset)
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{
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struct snd_firewire_event_lock_status event = {
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.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS,
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};
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event.status = (tscm->dev_lock_count > 0);
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tscm->dev_lock_changed = false;
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count = min_t(long, count, sizeof(event));
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spin_unlock_irq(&tscm->lock);
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if (copy_to_user(buf, &event, count))
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return -EFAULT;
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return count;
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}
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static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
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loff_t *offset)
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{
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struct snd_tscm *tscm = hwdep->private_data;
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DEFINE_WAIT(wait);
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union snd_firewire_event event = {
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.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS,
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};
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spin_lock_irq(&tscm->lock);
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@ -37,15 +53,13 @@ static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
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spin_lock_irq(&tscm->lock);
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}
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event.lock_status.status = (tscm->dev_lock_count > 0);
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tscm->dev_lock_changed = false;
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spin_unlock_irq(&tscm->lock);
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count = min_t(long, count, sizeof(event.lock_status));
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if (copy_to_user(buf, &event, count))
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return -EFAULT;
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// NOTE: The acquired lock should be released in callee side.
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if (tscm->dev_lock_changed) {
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count = tscm_hwdep_read_locked(tscm, buf, count, offset);
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} else {
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spin_unlock_irq(&tscm->lock);
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count = 0;
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}
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return count;
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}
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