[alsa-devel] [PATCH 07/13] bebob: Add hwdep interface to lock/unlock streaming
Takashi Sakamoto
o-takashi at sakamocchi.jp
Sat Nov 23 07:09:19 CET 2013
This is for mixer/control application in user land. The application can
lock/unlock kernel streaming or get notification at starting kernel streaming
to use hwdep interface.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
include/uapi/sound/asound.h | 3 +-
include/uapi/sound/firewire.h | 1 +
sound/firewire/Kconfig | 1 +
sound/firewire/bebob/Makefile | 2 +-
sound/firewire/bebob/bebob.c | 5 +
sound/firewire/bebob/bebob.h | 13 +++
sound/firewire/bebob/bebob_hwdep.c | 207 ++++++++++++++++++++++++++++++++++++
sound/firewire/bebob/bebob_midi.c | 10 ++
sound/firewire/bebob/bebob_pcm.c | 14 ++-
sound/firewire/bebob/bebob_stream.c | 39 +++++++
10 files changed, 290 insertions(+), 5 deletions(-)
create mode 100644 sound/firewire/bebob/bebob_hwdep.c
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index 9fc6219..d8bc723 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -94,9 +94,10 @@ enum {
SNDRV_HWDEP_IFACE_HDA, /* HD-audio */
SNDRV_HWDEP_IFACE_USB_STREAM, /* direct access to usb stream */
SNDRV_HWDEP_IFACE_FW_DICE, /* TC DICE FireWire device */
+ SNDRV_HWDEP_IFACE_FW_BEBOB, /* BridgeCo BeBoB based Device */
/* Don't forget to change the following: */
- SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_DICE
+ SNDRV_HWDEP_IFACE_LAST = SNDRV_HWDEP_IFACE_FW_BEBOB
};
struct snd_hwdep_info {
diff --git a/include/uapi/sound/firewire.h b/include/uapi/sound/firewire.h
index 59f5961..c600b143 100644
--- a/include/uapi/sound/firewire.h
+++ b/include/uapi/sound/firewire.h
@@ -34,6 +34,7 @@ union snd_firewire_event {
#define SNDRV_FIREWIRE_IOCTL_UNLOCK _IO('H', 0xfa)
#define SNDRV_FIREWIRE_TYPE_DICE 1
+#define SNDRV_FIREWIRE_TYPE_BEBOB 2
/* Fireworks, AV/C, RME, MOTU, ... */
struct snd_firewire_get_info {
diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig
index 7641772..c46578e 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -65,6 +65,7 @@ config SND_BEBOB
tristate "BridgeCo BeBoB chipset support"
select SND_RAWMIDI
select SND_PCM
+ select SND_HWDEP
select SND_FIREWIRE_LIB
help
Say Y here to include support for FireWire devices based
diff --git a/sound/firewire/bebob/Makefile b/sound/firewire/bebob/Makefile
index 30e79e6..81e14fa 100644
--- a/sound/firewire/bebob/Makefile
+++ b/sound/firewire/bebob/Makefile
@@ -1,4 +1,4 @@
snd-bebob-objs := bebob_command.o bebob_stream.o bebob_proc.o bebob_control.o \
- bebob_midi.o bebob_pcm.o \
+ bebob_midi.o bebob_pcm.o bebob_hwdep.o \
bebob.o
obj-m += snd-bebob.o
diff --git a/sound/firewire/bebob/bebob.c b/sound/firewire/bebob/bebob.c
index 2fdd14b..219eac7 100644
--- a/sound/firewire/bebob/bebob.c
+++ b/sound/firewire/bebob/bebob.c
@@ -171,12 +171,17 @@ snd_bebob_probe(struct fw_unit *unit,
bebob->card_index = -1;
mutex_init(&bebob->mutex);
spin_lock_init(&bebob->lock);
+ init_waitqueue_head(&bebob->hwdep_wait);
/* name device with communication */
err = name_device(bebob, entry->vendor_id);
if (err < 0)
goto error;
+ err = snd_bebob_create_hwdep_device(bebob);
+ if (err < 0)
+ goto error;
+
err = snd_bebob_create_pcm_devices(bebob);
if (err < 0)
goto error;
diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h
index 04842b2..3950b02 100644
--- a/sound/firewire/bebob/bebob.h
+++ b/sound/firewire/bebob/bebob.h
@@ -34,6 +34,8 @@
#include <sound/rawmidi.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
+#include <sound/firewire.h>
+#include <sound/hwdep.h>
#include "../packets-buffer.h"
#include "../iso-resources.h"
@@ -79,6 +81,11 @@ struct snd_bebob {
rx_stream_formations[SND_BEBOB_STRM_FMT_ENTRIES];
struct snd_ctl_elem_id *ctl_id_freq;
+
+ /* for uapi */
+ int dev_lock_count;
+ bool dev_lock_changed;
+ wait_queue_head_t hwdep_wait;
};
static inline int
@@ -152,6 +159,10 @@ int snd_bebob_stream_stop_duplex(struct snd_bebob *bebob);
void snd_bebob_stream_update_duplex(struct snd_bebob *bebob);
void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob);
+void snd_bebob_stream_lock_changed(struct snd_bebob *bebob);
+int snd_bebob_stream_lock_try(struct snd_bebob *bebob);
+void snd_bebob_stream_lock_release(struct snd_bebob *bebob);
+
void snd_bebob_proc_init(struct snd_bebob *bebob);
int snd_bebob_create_control_devices(struct snd_bebob *bebob);
@@ -160,6 +171,8 @@ int snd_bebob_create_midi_devices(struct snd_bebob *bebob);
int snd_bebob_create_pcm_devices(struct snd_bebob *bebob);
+int snd_bebob_create_hwdep_device(struct snd_bebob *bebob);
+
#define SND_BEBOB_DEV_ENTRY(vendor, model) \
{ \
.match_flags = IEEE1394_MATCH_VENDOR_ID | \
diff --git a/sound/firewire/bebob/bebob_hwdep.c b/sound/firewire/bebob/bebob_hwdep.c
new file mode 100644
index 0000000..be423b7
--- /dev/null
+++ b/sound/firewire/bebob/bebob_hwdep.c
@@ -0,0 +1,207 @@
+/*
+ * fireworks_hwdep.c - a part of driver for Fireworks based devices
+ *
+ * Copyright (c) 2013 Takashi Sakamoto
+ *
+ *
+ * This driver is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2.
+ *
+ * This driver is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this driver; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * This codes give three functionality.
+ *
+ * 1.get firewire node reference
+ * 2.lock/unlock stream
+ * dice driver implements the same functionality.
+ */
+
+#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(count, (long)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;
+}
+
diff --git a/sound/firewire/bebob/bebob_midi.c b/sound/firewire/bebob/bebob_midi.c
index 56c7115..a5a4028 100644
--- a/sound/firewire/bebob/bebob_midi.c
+++ b/sound/firewire/bebob/bebob_midi.c
@@ -26,6 +26,10 @@ 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;
+
err = snd_bebob_stream_start_duplex(bebob, &bebob->tx_stream, 0);
if (err < 0)
goto end;
@@ -40,6 +44,10 @@ 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;
+
err = snd_bebob_stream_start_duplex(bebob, &bebob->rx_stream, 0);
if (err < 0)
goto end;
@@ -55,6 +63,7 @@ static int midi_capture_close(struct snd_rawmidi_substream *substream)
amdtp_stream_midi_remove(&bebob->tx_stream, substream);
snd_bebob_stream_stop_duplex(bebob);
+ snd_bebob_stream_lock_release(bebob);
return 0;
}
@@ -65,6 +74,7 @@ static int midi_playback_close(struct snd_rawmidi_substream *substream)
amdtp_stream_midi_remove(&bebob->rx_stream, substream);
snd_bebob_stream_stop_duplex(bebob);
+ snd_bebob_stream_lock_release(bebob);
return 0;
}
diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c
index 04913b2..c7cca80 100644
--- a/sound/firewire/bebob/bebob_pcm.c
+++ b/sound/firewire/bebob/bebob_pcm.c
@@ -239,29 +239,37 @@ pcm_open(struct snd_pcm_substream *substream)
unsigned int sampling_rate;
int err;
- err = pcm_init_hw_params(bebob, substream);
+ err = snd_bebob_stream_lock_try(bebob);
if (err < 0)
goto end;
+ err = pcm_init_hw_params(bebob, substream);
+ if (err < 0)
+ goto err_locked;
+
if (amdtp_stream_pcm_running(&bebob->tx_stream) ||
amdtp_stream_pcm_running(&bebob->rx_stream)) {
err = snd_bebob_stream_get_rate(bebob, &sampling_rate);
if (err < 0)
- goto end;
+ goto err_locked;
substream->runtime->hw.rate_min = sampling_rate;
substream->runtime->hw.rate_max = sampling_rate;
}
snd_pcm_set_sync(substream);
-
end:
return err;
+err_locked:
+ snd_bebob_stream_lock_release(bebob);
+ return err;
}
static int
pcm_close(struct snd_pcm_substream *substream)
{
+ struct snd_bebob *bebob = substream->private_data;
+ snd_bebob_stream_lock_release(bebob);
return 0;
}
diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
index 773dffb..f2527bf 100644
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -666,3 +666,42 @@ int snd_bebob_stream_discover(struct snd_bebob *bebob)
end:
return err;
}
+
+void snd_bebob_stream_lock_changed(struct snd_bebob *bebob)
+{
+ bebob->dev_lock_changed = true;
+ wake_up(&bebob->hwdep_wait);
+}
+
+int snd_bebob_stream_lock_try(struct snd_bebob *bebob)
+{
+ int err;
+
+ spin_lock_irq(&bebob->lock);
+
+ /* user land lock this */
+ if (bebob->dev_lock_count < 0) {
+ err = -EBUSY;
+ goto end;
+ }
+
+ /* this is the first time */
+ if (bebob->dev_lock_count++ == 0)
+ snd_bebob_stream_lock_changed(bebob);
+ err = 0;
+end:
+ spin_unlock_irq(&bebob->lock);
+ return err;
+}
+
+void snd_bebob_stream_lock_release(struct snd_bebob *bebob)
+{
+ spin_lock_irq(&bebob->lock);
+
+ if (WARN_ON(bebob->dev_lock_count <= 0))
+ goto end;
+ if (--bebob->dev_lock_count == 0)
+ snd_bebob_stream_lock_changed(bebob);
+end:
+ spin_unlock_irq(&bebob->lock);
+}
--
1.8.3.2
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