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This commit adds hwdep interface so as the other drivers for audio and music units on IEEE 1394 have. This interface is designed for mixer/control applications. By using this interface, an application can get information about firewire node, can lock/unlock kernel streaming and can get notification at starting/stopping kernel streaming. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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Original file line number | Diff line number | Diff line change |
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@@ -1,3 +1,3 @@ | ||
snd-fireface-objs := ff.o ff-transaction.o ff-midi.o ff-proc.o amdtp-ff.o \ | ||
ff-stream.o ff-pcm.o | ||
ff-stream.o ff-pcm.o ff-hwdep.o | ||
obj-$(CONFIG_SND_FIREFACE) += snd-fireface.o |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,191 @@ | ||
/* | ||
* ff-hwdep.c - a part of driver for RME Fireface series | ||
* | ||
* Copyright (c) 2015-2017 Takashi Sakamoto | ||
* | ||
* Licensed under the terms of the GNU General Public License, version 2. | ||
*/ | ||
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/* | ||
* This codes give three functionality. | ||
* | ||
* 1.get firewire node information | ||
* 2.get notification about starting/stopping stream | ||
* 3.lock/unlock stream | ||
*/ | ||
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#include "ff.h" | ||
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static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count, | ||
loff_t *offset) | ||
{ | ||
struct snd_ff *ff = hwdep->private_data; | ||
DEFINE_WAIT(wait); | ||
union snd_firewire_event event; | ||
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spin_lock_irq(&ff->lock); | ||
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while (!ff->dev_lock_changed) { | ||
prepare_to_wait(&ff->hwdep_wait, &wait, TASK_INTERRUPTIBLE); | ||
spin_unlock_irq(&ff->lock); | ||
schedule(); | ||
finish_wait(&ff->hwdep_wait, &wait); | ||
if (signal_pending(current)) | ||
return -ERESTARTSYS; | ||
spin_lock_irq(&ff->lock); | ||
} | ||
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memset(&event, 0, sizeof(event)); | ||
if (ff->dev_lock_changed) { | ||
event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS; | ||
event.lock_status.status = (ff->dev_lock_count > 0); | ||
ff->dev_lock_changed = false; | ||
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count = min_t(long, count, sizeof(event.lock_status)); | ||
} | ||
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spin_unlock_irq(&ff->lock); | ||
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if (copy_to_user(buf, &event, count)) | ||
return -EFAULT; | ||
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return count; | ||
} | ||
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static unsigned int hwdep_poll(struct snd_hwdep *hwdep, struct file *file, | ||
poll_table *wait) | ||
{ | ||
struct snd_ff *ff = hwdep->private_data; | ||
unsigned int events; | ||
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poll_wait(file, &ff->hwdep_wait, wait); | ||
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spin_lock_irq(&ff->lock); | ||
if (ff->dev_lock_changed) | ||
events = POLLIN | POLLRDNORM; | ||
else | ||
events = 0; | ||
spin_unlock_irq(&ff->lock); | ||
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return events; | ||
} | ||
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static int hwdep_get_info(struct snd_ff *ff, void __user *arg) | ||
{ | ||
struct fw_device *dev = fw_parent_device(ff->unit); | ||
struct snd_firewire_get_info info; | ||
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memset(&info, 0, sizeof(info)); | ||
info.type = SNDRV_FIREWIRE_TYPE_FIREFACE; | ||
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)); | ||
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if (copy_to_user(arg, &info, sizeof(info))) | ||
return -EFAULT; | ||
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return 0; | ||
} | ||
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static int hwdep_lock(struct snd_ff *ff) | ||
{ | ||
int err; | ||
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spin_lock_irq(&ff->lock); | ||
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if (ff->dev_lock_count == 0) { | ||
ff->dev_lock_count = -1; | ||
err = 0; | ||
} else { | ||
err = -EBUSY; | ||
} | ||
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spin_unlock_irq(&ff->lock); | ||
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return err; | ||
} | ||
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static int hwdep_unlock(struct snd_ff *ff) | ||
{ | ||
int err; | ||
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spin_lock_irq(&ff->lock); | ||
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if (ff->dev_lock_count == -1) { | ||
ff->dev_lock_count = 0; | ||
err = 0; | ||
} else { | ||
err = -EBADFD; | ||
} | ||
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spin_unlock_irq(&ff->lock); | ||
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return err; | ||
} | ||
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static int hwdep_release(struct snd_hwdep *hwdep, struct file *file) | ||
{ | ||
struct snd_ff *ff = hwdep->private_data; | ||
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spin_lock_irq(&ff->lock); | ||
if (ff->dev_lock_count == -1) | ||
ff->dev_lock_count = 0; | ||
spin_unlock_irq(&ff->lock); | ||
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return 0; | ||
} | ||
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static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file, | ||
unsigned int cmd, unsigned long arg) | ||
{ | ||
struct snd_ff *ff = hwdep->private_data; | ||
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switch (cmd) { | ||
case SNDRV_FIREWIRE_IOCTL_GET_INFO: | ||
return hwdep_get_info(ff, (void __user *)arg); | ||
case SNDRV_FIREWIRE_IOCTL_LOCK: | ||
return hwdep_lock(ff); | ||
case SNDRV_FIREWIRE_IOCTL_UNLOCK: | ||
return hwdep_unlock(ff); | ||
default: | ||
return -ENOIOCTLCMD; | ||
} | ||
} | ||
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#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 | ||
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int snd_ff_create_hwdep_devices(struct snd_ff *ff) | ||
{ | ||
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, | ||
}; | ||
struct snd_hwdep *hwdep; | ||
int err; | ||
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err = snd_hwdep_new(ff->card, ff->card->driver, 0, &hwdep); | ||
if (err < 0) | ||
return err; | ||
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strcpy(hwdep->name, ff->card->driver); | ||
hwdep->iface = SNDRV_HWDEP_IFACE_FW_FIREFACE; | ||
hwdep->ops = hwdep_ops; | ||
hwdep->private_data = ff; | ||
hwdep->exclusive = true; | ||
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return 0; | ||
} |
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