--- /dev/null
+/*
+ * bebob_hwdep.c - a part of driver for BeBoB based devices
+ *
+ * Copyright (c) 2013-2014 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+/*
+ * This codes give three functionality.
+ *
+ * 1.get firewire node infomation
+ * 2.get notification about starting/stopping stream
+ * 3.lock/unlock stream
+ */
+
+#include "bebob.h"
+
+static long
+hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
+ loff_t *offset)
+{
+ struct snd_bebob *bebob = hwdep->private_data;
+ DEFINE_WAIT(wait);
+ union snd_firewire_event event;
+
+ spin_lock_irq(&bebob->lock);
+
+ while (!bebob->dev_lock_changed) {
+ prepare_to_wait(&bebob->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
+ spin_unlock_irq(&bebob->lock);
+ schedule();
+ finish_wait(&bebob->hwdep_wait, &wait);
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+ spin_lock_irq(&bebob->lock);
+ }
+
+ memset(&event, 0, sizeof(event));
+ if (bebob->dev_lock_changed) {
+ event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
+ event.lock_status.status = (bebob->dev_lock_count > 0);
+ bebob->dev_lock_changed = false;
+
+ count = min_t(long, count, sizeof(event.lock_status));
+ }
+
+ spin_unlock_irq(&bebob->lock);
+
+ if (copy_to_user(buf, &event, count))
+ return -EFAULT;
+
+ return count;
+}
+
+static unsigned int
+hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait)
+{
+ struct snd_bebob *bebob = hwdep->private_data;
+ unsigned int events;
+
+ poll_wait(file, &bebob->hwdep_wait, wait);
+
+ spin_lock_irq(&bebob->lock);
+ if (bebob->dev_lock_changed)
+ events = POLLIN | POLLRDNORM;
+ else
+ events = 0;
+ spin_unlock_irq(&bebob->lock);
+
+ return events;
+}
+
+static int
+hwdep_get_info(struct snd_bebob *bebob, void __user *arg)
+{
+ struct fw_device *dev = fw_parent_device(bebob->unit);
+ struct snd_firewire_get_info info;
+
+ memset(&info, 0, sizeof(info));
+ info.type = SNDRV_FIREWIRE_TYPE_BEBOB;
+ info.card = dev->card->index;
+ *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
+ *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
+ strlcpy(info.device_name, dev_name(&dev->device),
+ sizeof(info.device_name));
+
+ if (copy_to_user(arg, &info, sizeof(info)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int
+hwdep_lock(struct snd_bebob *bebob)
+{
+ int err;
+
+ spin_lock_irq(&bebob->lock);
+
+ if (bebob->dev_lock_count == 0) {
+ bebob->dev_lock_count = -1;
+ err = 0;
+ } else {
+ err = -EBUSY;
+ }
+
+ spin_unlock_irq(&bebob->lock);
+
+ return err;
+}
+
+static int
+hwdep_unlock(struct snd_bebob *bebob)
+{
+ int err;
+
+ spin_lock_irq(&bebob->lock);
+
+ if (bebob->dev_lock_count == -1) {
+ bebob->dev_lock_count = 0;
+ err = 0;
+ } else {
+ err = -EBADFD;
+ }
+
+ spin_unlock_irq(&bebob->lock);
+
+ return err;
+}
+
+static int
+hwdep_release(struct snd_hwdep *hwdep, struct file *file)
+{
+ struct snd_bebob *bebob = hwdep->private_data;
+
+ spin_lock_irq(&bebob->lock);
+ if (bebob->dev_lock_count == -1)
+ bebob->dev_lock_count = 0;
+ spin_unlock_irq(&bebob->lock);
+
+ return 0;
+}
+
+static int
+hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct snd_bebob *bebob = hwdep->private_data;
+
+ switch (cmd) {
+ case SNDRV_FIREWIRE_IOCTL_GET_INFO:
+ return hwdep_get_info(bebob, (void __user *)arg);
+ case SNDRV_FIREWIRE_IOCTL_LOCK:
+ return hwdep_lock(bebob);
+ case SNDRV_FIREWIRE_IOCTL_UNLOCK:
+ return hwdep_unlock(bebob);
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+static int
+hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ return hwdep_ioctl(hwdep, file, cmd,
+ (unsigned long)compat_ptr(arg));
+}
+#else
+#define hwdep_compat_ioctl NULL
+#endif
+
+static const struct snd_hwdep_ops hwdep_ops = {
+ .read = hwdep_read,
+ .release = hwdep_release,
+ .poll = hwdep_poll,
+ .ioctl = hwdep_ioctl,
+ .ioctl_compat = hwdep_compat_ioctl,
+};
+
+int snd_bebob_create_hwdep_device(struct snd_bebob *bebob)
+{
+ struct snd_hwdep *hwdep;
+ int err;
+
+ err = snd_hwdep_new(bebob->card, "BeBoB", 0, &hwdep);
+ if (err < 0)
+ goto end;
+ strcpy(hwdep->name, "BeBoB");
+ hwdep->iface = SNDRV_HWDEP_IFACE_FW_BEBOB;
+ hwdep->ops = hwdep_ops;
+ hwdep->private_data = bebob;
+ hwdep->exclusive = true;
+end:
+ return err;
+}
+
static int midi_capture_open(struct snd_rawmidi_substream *substream)
{
struct snd_bebob *bebob = substream->rmidi->private_data;
+ int err;
+
+ err = snd_bebob_stream_lock_try(bebob);
+ if (err < 0)
+ goto end;
atomic_inc(&bebob->capture_substreams);
- return snd_bebob_stream_start_duplex(bebob, 0);
+ err = snd_bebob_stream_start_duplex(bebob, 0);
+ if (err < 0)
+ snd_bebob_stream_lock_release(bebob);
+end:
+ return err;
}
static int midi_playback_open(struct snd_rawmidi_substream *substream)
{
struct snd_bebob *bebob = substream->rmidi->private_data;
+ int err;
+
+ err = snd_bebob_stream_lock_try(bebob);
+ if (err < 0)
+ goto end;
atomic_inc(&bebob->playback_substreams);
- return snd_bebob_stream_start_duplex(bebob, 0);
+ err = snd_bebob_stream_start_duplex(bebob, 0);
+ if (err < 0)
+ snd_bebob_stream_lock_release(bebob);
+end:
+ return err;
}
static int midi_capture_close(struct snd_rawmidi_substream *substream)
atomic_dec(&bebob->capture_substreams);
snd_bebob_stream_stop_duplex(bebob);
+ snd_bebob_stream_lock_release(bebob);
return 0;
}
atomic_dec(&bebob->playback_substreams);
snd_bebob_stream_stop_duplex(bebob);
+ snd_bebob_stream_lock_release(bebob);
return 0;
}
projects / firefly-linux-kernel-4.4.55.git / commitdiff