Merge remote-tracking branch 'sound/for-next'

[karo-tx-linux.git] / sound / firewire / tascam / tascam-hwdep.c

diff --git a/sound/firewire/tascam/tascam-hwdep.c b/sound/firewire/tascam/tascam-hwdep.c
new file mode 100644 (file)
index 0000000..131267c
--- /dev/null
+++ b/sound/firewire/tascam/tascam-hwdep.c
@@ -0,0 +1,201 @@
+/*
+ * tascam-hwdep.c - a part of driver for TASCAM FireWire series
+ *
+ * Copyright (c) 2015 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+/*
+ * This codes give three functionality.
+ *
+ * 1.get firewire node information
+ * 2.get notification about starting/stopping stream
+ * 3.lock/unlock stream
+ */
+
+#include "tascam.h"
+
+static long hwdep_read_locked(struct snd_tscm *tscm, char __user *buf,
+                             long count)
+{
+       union snd_firewire_event event;
+
+       memset(&event, 0, sizeof(event));
+
+       event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
+       event.lock_status.status = (tscm->dev_lock_count > 0);
+       tscm->dev_lock_changed = false;
+
+       count = min_t(long, count, sizeof(event.lock_status));
+
+       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;
+
+       spin_lock_irq(&tscm->lock);
+
+       while (!tscm->dev_lock_changed) {
+               prepare_to_wait(&tscm->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
+               spin_unlock_irq(&tscm->lock);
+               schedule();
+               finish_wait(&tscm->hwdep_wait, &wait);
+               if (signal_pending(current))
+                       return -ERESTARTSYS;
+               spin_lock_irq(&tscm->lock);
+       }
+
+       memset(&event, 0, sizeof(event));
+       count = hwdep_read_locked(tscm, buf, count);
+       spin_unlock_irq(&tscm->lock);
+
+       return count;
+}
+
+static unsigned int hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
+                              poll_table *wait)
+{
+       struct snd_tscm *tscm = hwdep->private_data;
+       unsigned int events;
+
+       poll_wait(file, &tscm->hwdep_wait, wait);
+
+       spin_lock_irq(&tscm->lock);
+       if (tscm->dev_lock_changed)
+               events = POLLIN | POLLRDNORM;
+       else
+               events = 0;
+       spin_unlock_irq(&tscm->lock);
+
+       return events;
+}
+
+static int hwdep_get_info(struct snd_tscm *tscm, void __user *arg)
+{
+       struct fw_device *dev = fw_parent_device(tscm->unit);
+       struct snd_firewire_get_info info;
+
+       memset(&info, 0, sizeof(info));
+       info.type = SNDRV_FIREWIRE_TYPE_TASCAM;
+       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_tscm *tscm)
+{
+       int err;
+
+       spin_lock_irq(&tscm->lock);
+
+       if (tscm->dev_lock_count == 0) {
+               tscm->dev_lock_count = -1;
+               err = 0;
+       } else {
+               err = -EBUSY;
+       }
+
+       spin_unlock_irq(&tscm->lock);
+
+       return err;
+}
+
+static int hwdep_unlock(struct snd_tscm *tscm)
+{
+       int err;
+
+       spin_lock_irq(&tscm->lock);
+
+       if (tscm->dev_lock_count == -1) {
+               tscm->dev_lock_count = 0;
+               err = 0;
+       } else {
+               err = -EBADFD;
+       }
+
+       spin_unlock_irq(&tscm->lock);
+
+       return err;
+}
+
+static int hwdep_release(struct snd_hwdep *hwdep, struct file *file)
+{
+       struct snd_tscm *tscm = hwdep->private_data;
+
+       spin_lock_irq(&tscm->lock);
+       if (tscm->dev_lock_count == -1)
+               tscm->dev_lock_count = 0;
+       spin_unlock_irq(&tscm->lock);
+
+       return 0;
+}
+
+static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
+           unsigned int cmd, unsigned long arg)
+{
+       struct snd_tscm *tscm = hwdep->private_data;
+
+       switch (cmd) {
+       case SNDRV_FIREWIRE_IOCTL_GET_INFO:
+               return hwdep_get_info(tscm, (void __user *)arg);
+       case SNDRV_FIREWIRE_IOCTL_LOCK:
+               return hwdep_lock(tscm);
+       case SNDRV_FIREWIRE_IOCTL_UNLOCK:
+               return hwdep_unlock(tscm);
+       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_tscm_create_hwdep_device(struct snd_tscm *tscm)
+{
+       struct snd_hwdep *hwdep;
+       int err;
+
+       err = snd_hwdep_new(tscm->card, "Tascam", 0, &hwdep);
+       if (err < 0)
+               return err;
+
+       strcpy(hwdep->name, "Tascam");
+       hwdep->iface = SNDRV_HWDEP_IFACE_FW_TASCAM;
+       hwdep->ops = hwdep_ops;
+       hwdep->private_data = tscm;
+       hwdep->exclusive = true;
+
+       return err;
+}