ALSA: fireworks: Add hwdep interface
This interface is designed for mixer/control application. To use hwdep
interface, the 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>
diff --git a/sound/firewire/fireworks/Makefile b/sound/firewire/fireworks/Makefile
index d7ebf83..0c74408 100644
--- a/sound/firewire/fireworks/Makefile
+++ b/sound/firewire/fireworks/Makefile
@@ -1,4 +1,4 @@
snd-fireworks-objs := fireworks_transaction.o fireworks_command.o \
fireworks_stream.o fireworks_proc.o fireworks_midi.o \
- fireworks_pcm.o fireworks.o
+ fireworks_pcm.o fireworks_hwdep.o fireworks.o
obj-m += snd-fireworks.o
diff --git a/sound/firewire/fireworks/fireworks.c b/sound/firewire/fireworks/fireworks.c
index d7877c7..f8d06f5 100644
--- a/sound/firewire/fireworks/fireworks.c
+++ b/sound/firewire/fireworks/fireworks.c
@@ -217,6 +217,7 @@
efw->unit = unit;
mutex_init(&efw->mutex);
spin_lock_init(&efw->lock);
+ init_waitqueue_head(&efw->hwdep_wait);
err = get_hardware_info(efw);
if (err < 0)
@@ -236,6 +237,10 @@
if (err < 0)
goto error;
+ err = snd_efw_create_hwdep_device(efw);
+ if (err < 0)
+ goto error;
+
err = snd_efw_stream_init_duplex(efw);
if (err < 0)
goto error;
diff --git a/sound/firewire/fireworks/fireworks.h b/sound/firewire/fireworks/fireworks.h
index 36419ca..4aaf2dc 100644
--- a/sound/firewire/fireworks/fireworks.h
+++ b/sound/firewire/fireworks/fireworks.h
@@ -24,6 +24,8 @@
#include <sound/info.h>
#include <sound/rawmidi.h>
#include <sound/pcm_params.h>
+#include <sound/firewire.h>
+#include <sound/hwdep.h>
#include "../packets-buffer.h"
#include "../iso-resources.h"
@@ -90,6 +92,11 @@
unsigned int phys_in_grp_count;
struct snd_efw_phys_grp phys_out_grps[HWINFO_MAX_CAPS_GROUPS];
struct snd_efw_phys_grp phys_in_grps[HWINFO_MAX_CAPS_GROUPS];
+
+ /* for uapi */
+ int dev_lock_count;
+ bool dev_lock_changed;
+ wait_queue_head_t hwdep_wait;
};
struct snd_efw_transaction {
@@ -197,6 +204,9 @@
void snd_efw_stream_stop_duplex(struct snd_efw *efw);
void snd_efw_stream_update_duplex(struct snd_efw *efw);
void snd_efw_stream_destroy_duplex(struct snd_efw *efw);
+void snd_efw_stream_lock_changed(struct snd_efw *efw);
+int snd_efw_stream_lock_try(struct snd_efw *efw);
+void snd_efw_stream_lock_release(struct snd_efw *efw);
void snd_efw_proc_init(struct snd_efw *efw);
@@ -205,6 +215,8 @@
int snd_efw_create_pcm_devices(struct snd_efw *efw);
int snd_efw_get_multiplier_mode(unsigned int sampling_rate, unsigned int *mode);
+int snd_efw_create_hwdep_device(struct snd_efw *efw);
+
#define SND_EFW_DEV_ENTRY(vendor, model) \
{ \
.match_flags = IEEE1394_MATCH_VENDOR_ID | \
diff --git a/sound/firewire/fireworks/fireworks_hwdep.c b/sound/firewire/fireworks/fireworks_hwdep.c
new file mode 100644
index 0000000..1cf491d
--- /dev/null
+++ b/sound/firewire/fireworks/fireworks_hwdep.c
@@ -0,0 +1,199 @@
+/*
+ * fireworks_hwdep.c - a part of driver for Fireworks based devices
+ *
+ * Copyright (c) 2013-2014 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+/*
+ * This codes have three functionalities.
+ *
+ * 1.get information about firewire node
+ * 2.get notification about starting/stopping stream
+ * 3.lock/unlock streaming
+ */
+
+#include "fireworks.h"
+
+static long
+hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
+ loff_t *offset)
+{
+ struct snd_efw *efw = hwdep->private_data;
+ DEFINE_WAIT(wait);
+ union snd_firewire_event event;
+
+ spin_lock_irq(&efw->lock);
+
+ while (!efw->dev_lock_changed) {
+ prepare_to_wait(&efw->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
+ spin_unlock_irq(&efw->lock);
+ schedule();
+ finish_wait(&efw->hwdep_wait, &wait);
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+ spin_lock_irq(&efw->lock);
+ }
+
+ memset(&event, 0, sizeof(event));
+ if (efw->dev_lock_changed) {
+ event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
+ event.lock_status.status = (efw->dev_lock_count > 0);
+ efw->dev_lock_changed = false;
+
+ count = min_t(long, count, sizeof(event.lock_status));
+ }
+
+ spin_unlock_irq(&efw->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_efw *efw = hwdep->private_data;
+ unsigned int events;
+
+ poll_wait(file, &efw->hwdep_wait, wait);
+
+ spin_lock_irq(&efw->lock);
+ if (efw->dev_lock_changed)
+ events = POLLIN | POLLRDNORM;
+ else
+ events = 0;
+ spin_unlock_irq(&efw->lock);
+
+ return events;
+}
+
+static int
+hwdep_get_info(struct snd_efw *efw, void __user *arg)
+{
+ struct fw_device *dev = fw_parent_device(efw->unit);
+ struct snd_firewire_get_info info;
+
+ memset(&info, 0, sizeof(info));
+ info.type = SNDRV_FIREWIRE_TYPE_FIREWORKS;
+ 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_efw *efw)
+{
+ int err;
+
+ spin_lock_irq(&efw->lock);
+
+ if (efw->dev_lock_count == 0) {
+ efw->dev_lock_count = -1;
+ err = 0;
+ } else {
+ err = -EBUSY;
+ }
+
+ spin_unlock_irq(&efw->lock);
+
+ return err;
+}
+
+static int
+hwdep_unlock(struct snd_efw *efw)
+{
+ int err;
+
+ spin_lock_irq(&efw->lock);
+
+ if (efw->dev_lock_count == -1) {
+ efw->dev_lock_count = 0;
+ err = 0;
+ } else {
+ err = -EBADFD;
+ }
+
+ spin_unlock_irq(&efw->lock);
+
+ return err;
+}
+
+static int
+hwdep_release(struct snd_hwdep *hwdep, struct file *file)
+{
+ struct snd_efw *efw = hwdep->private_data;
+
+ spin_lock_irq(&efw->lock);
+ if (efw->dev_lock_count == -1)
+ efw->dev_lock_count = 0;
+ spin_unlock_irq(&efw->lock);
+
+ return 0;
+}
+
+static int
+hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct snd_efw *efw = hwdep->private_data;
+
+ switch (cmd) {
+ case SNDRV_FIREWIRE_IOCTL_GET_INFO:
+ return hwdep_get_info(efw, (void __user *)arg);
+ case SNDRV_FIREWIRE_IOCTL_LOCK:
+ return hwdep_lock(efw);
+ case SNDRV_FIREWIRE_IOCTL_UNLOCK:
+ return hwdep_unlock(efw);
+ 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_efw_create_hwdep_device(struct snd_efw *efw)
+{
+ struct snd_hwdep *hwdep;
+ int err;
+
+ err = snd_hwdep_new(efw->card, "Fireworks", 0, &hwdep);
+ if (err < 0)
+ goto end;
+ strcpy(hwdep->name, "Fireworks");
+ hwdep->iface = SNDRV_HWDEP_IFACE_FW_FIREWORKS;
+ hwdep->ops = hwdep_ops;
+ hwdep->private_data = efw;
+ hwdep->exclusive = true;
+end:
+ return err;
+}
+
diff --git a/sound/firewire/fireworks/fireworks_midi.c b/sound/firewire/fireworks/fireworks_midi.c
index cbf34e9..4a600d2 100644
--- a/sound/firewire/fireworks/fireworks_midi.c
+++ b/sound/firewire/fireworks/fireworks_midi.c
@@ -11,17 +11,36 @@
static int midi_capture_open(struct snd_rawmidi_substream *substream)
{
struct snd_efw *efw = substream->rmidi->private_data;
+ int err;
+
+ err = snd_efw_stream_lock_try(efw);
+ if (err < 0)
+ goto end;
atomic_inc(&efw->capture_substreams);
- return snd_efw_stream_start_duplex(efw, 0);
+ err = snd_efw_stream_start_duplex(efw, 0);
+ if (err < 0)
+ snd_efw_stream_lock_release(efw);
+
+end:
+ return err;
}
static int midi_playback_open(struct snd_rawmidi_substream *substream)
{
struct snd_efw *efw = substream->rmidi->private_data;
+ int err;
+
+ err = snd_efw_stream_lock_try(efw);
+ if (err < 0)
+ goto end;
atomic_inc(&efw->playback_substreams);
- return snd_efw_stream_start_duplex(efw, 0);
+ err = snd_efw_stream_start_duplex(efw, 0);
+ if (err < 0)
+ snd_efw_stream_lock_release(efw);
+end:
+ return err;
}
static int midi_capture_close(struct snd_rawmidi_substream *substream)
@@ -31,6 +50,7 @@
atomic_dec(&efw->capture_substreams);
snd_efw_stream_stop_duplex(efw);
+ snd_efw_stream_lock_release(efw);
return 0;
}
@@ -41,6 +61,7 @@
atomic_dec(&efw->playback_substreams);
snd_efw_stream_stop_duplex(efw);
+ snd_efw_stream_lock_release(efw);
return 0;
}
diff --git a/sound/firewire/fireworks/fireworks_pcm.c b/sound/firewire/fireworks/fireworks_pcm.c
index 15ec4e0..ed211d0 100644
--- a/sound/firewire/fireworks/fireworks_pcm.c
+++ b/sound/firewire/fireworks/fireworks_pcm.c
@@ -199,13 +199,17 @@
unsigned int clock_source;
int err;
- err = pcm_init_hw_params(efw, substream);
+ err = snd_efw_stream_lock_try(efw);
if (err < 0)
goto end;
+ err = pcm_init_hw_params(efw, substream);
+ if (err < 0)
+ goto err_locked;
+
err = snd_efw_command_get_clock_source(efw, &clock_source);
if (err < 0)
- goto end;
+ goto err_locked;
/*
* When source of clock is not internal or any PCM streams are running,
@@ -216,7 +220,7 @@
amdtp_stream_pcm_running(&efw->rx_stream)) {
err = snd_efw_command_get_sampling_rate(efw, &sampling_rate);
if (err < 0)
- goto end;
+ goto err_locked;
substream->runtime->hw.rate_min = sampling_rate;
substream->runtime->hw.rate_max = sampling_rate;
}
@@ -224,10 +228,15 @@
snd_pcm_set_sync(substream);
end:
return err;
+err_locked:
+ snd_efw_stream_lock_release(efw);
+ return err;
}
static int pcm_close(struct snd_pcm_substream *substream)
{
+ struct snd_efw *efw = substream->private_data;
+ snd_efw_stream_lock_release(efw);
return 0;
}
diff --git a/sound/firewire/fireworks/fireworks_stream.c b/sound/firewire/fireworks/fireworks_stream.c
index 1860914..eaab8f6 100644
--- a/sound/firewire/fireworks/fireworks_stream.c
+++ b/sound/firewire/fireworks/fireworks_stream.c
@@ -331,3 +331,42 @@
mutex_unlock(&efw->mutex);
}
+
+void snd_efw_stream_lock_changed(struct snd_efw *efw)
+{
+ efw->dev_lock_changed = true;
+ wake_up(&efw->hwdep_wait);
+}
+
+int snd_efw_stream_lock_try(struct snd_efw *efw)
+{
+ int err;
+
+ spin_lock_irq(&efw->lock);
+
+ /* user land lock this */
+ if (efw->dev_lock_count < 0) {
+ err = -EBUSY;
+ goto end;
+ }
+
+ /* this is the first time */
+ if (efw->dev_lock_count++ == 0)
+ snd_efw_stream_lock_changed(efw);
+ err = 0;
+end:
+ spin_unlock_irq(&efw->lock);
+ return err;
+}
+
+void snd_efw_stream_lock_release(struct snd_efw *efw)
+{
+ spin_lock_irq(&efw->lock);
+
+ if (WARN_ON(efw->dev_lock_count <= 0))
+ goto end;
+ if (--efw->dev_lock_count == 0)
+ snd_efw_stream_lock_changed(efw);
+end:
+ spin_unlock_irq(&efw->lock);
+}
