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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2018-11-23 13:13:06 +0900
committerTakashi Iwai <tiwai@suse.de>2018-11-23 15:31:14 +0100
commitafb8e2daa031b39900488515a73c0998491ac4b8 (patch)
tree2abc9b9f2f465107c52b7eadb674eaf00d2842d4 /sound/firewire
parentd7167422433cdb61e58baee9c25543d0eba95c9d (diff)
downloadlinux-stericsson-afb8e2daa031b39900488515a73c0998491ac4b8.tar.gz
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>
Diffstat (limited to 'sound/firewire')
-rw-r--r--sound/firewire/tascam/tascam-hwdep.c38
1 files changed, 26 insertions, 12 deletions
diff --git a/sound/firewire/tascam/tascam-hwdep.c b/sound/firewire/tascam/tascam-hwdep.c
index 9afa827af05d..8f34cede2e9f 100644
--- a/sound/firewire/tascam/tascam-hwdep.c
+++ b/sound/firewire/tascam/tascam-hwdep.c
@@ -16,14 +16,30 @@
#include "tascam.h"
+static long tscm_hwdep_read_locked(struct snd_tscm *tscm, char __user *buf,
+ long count, loff_t *offset)
+{
+ struct snd_firewire_event_lock_status event = {
+ .type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS,
+ };
+
+ event.status = (tscm->dev_lock_count > 0);
+ tscm->dev_lock_changed = false;
+ count = min_t(long, count, sizeof(event));
+
+ spin_unlock_irq(&tscm->lock);
+
+ if (copy_to_user(buf, &event, count))
+ return -EFAULT;
+
+ return count;
+}
+
static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
loff_t *offset)
{
struct snd_tscm *tscm = hwdep->private_data;
DEFINE_WAIT(wait);
- union snd_firewire_event event = {
- .lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS,
- };
spin_lock_irq(&tscm->lock);
@@ -37,15 +53,13 @@ static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
spin_lock_irq(&tscm->lock);
}
- event.lock_status.status = (tscm->dev_lock_count > 0);
- tscm->dev_lock_changed = false;
-
- spin_unlock_irq(&tscm->lock);
-
- count = min_t(long, count, sizeof(event.lock_status));
-
- if (copy_to_user(buf, &event, count))
- return -EFAULT;
+ // NOTE: The acquired lock should be released in callee side.
+ if (tscm->dev_lock_changed) {
+ count = tscm_hwdep_read_locked(tscm, buf, count, offset);
+ } else {
+ spin_unlock_irq(&tscm->lock);
+ count = 0;
+ }
return count;
}