[alsa-devel] [PATCH 07/11] ALSA: digi00x: support unknown asynchronous message
Takashi Sakamoto
o-takashi at sakamocchi.jp
Sun Mar 29 17:05:27 CEST 2015
Digi 002/003 family use asynchronous transaction for messaging.
The address to receive this message is stored on a certain register.
This commit allocates a certain range of address on OHCI 1394 host
controller, to handle this notification. Currently, the purpose of
this message is unknown.
Usually, these devices confirmedly notify these messages below:
* Clock source is set as internal:
- 0x00007051
- 0x00007052
- 0x00007054
- 0x00007057
- 0x00007058
* Clock source is set as somewhat external:
- 0x00009000
- 0x00009010
- 0x00009020
- 0x00009021
- 0x00009022
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
include/uapi/sound/firewire.h | 7 ++
sound/firewire/digi00x/Makefile | 2 +-
sound/firewire/digi00x/digi00x-hwdep.c | 12 ++-
sound/firewire/digi00x/digi00x-protocol.c | 131 ++++++++++++++++++++++++++++++
sound/firewire/digi00x/digi00x.c | 12 +++
sound/firewire/digi00x/digi00x.h | 8 ++
6 files changed, 169 insertions(+), 3 deletions(-)
create mode 100644 sound/firewire/digi00x/digi00x-protocol.c
diff --git a/include/uapi/sound/firewire.h b/include/uapi/sound/firewire.h
index f67d228..8e32b41 100644
--- a/include/uapi/sound/firewire.h
+++ b/include/uapi/sound/firewire.h
@@ -9,6 +9,7 @@
#define SNDRV_FIREWIRE_EVENT_LOCK_STATUS 0x000010cc
#define SNDRV_FIREWIRE_EVENT_DICE_NOTIFICATION 0xd1ce004e
#define SNDRV_FIREWIRE_EVENT_EFW_RESPONSE 0x4e617475
+#define SNDRV_FIREWIRE_EVENT_DIGI00x_MESSAGE 0x746e736c
struct snd_firewire_event_common {
unsigned int type; /* SNDRV_FIREWIRE_EVENT_xxx */
@@ -40,11 +41,17 @@ struct snd_firewire_event_efw_response {
__be32 response[0]; /* some responses */
};
+struct snd_firewire_event_digi00x_message {
+ unsigned int type;
+ __u32 message; /* Digi00x-specific message */
+};
+
union snd_firewire_event {
struct snd_firewire_event_common common;
struct snd_firewire_event_lock_status lock_status;
struct snd_firewire_event_dice_notification dice_notification;
struct snd_firewire_event_efw_response efw_response;
+ struct snd_firewire_event_digi00x_message digi00x_message;
};
diff --git a/sound/firewire/digi00x/Makefile b/sound/firewire/digi00x/Makefile
index deb3683..e42b5cc 100644
--- a/sound/firewire/digi00x/Makefile
+++ b/sound/firewire/digi00x/Makefile
@@ -1,3 +1,3 @@
snd-digi00x-objs := digi00x.o digi00x-stream.o digi00x-proc.o digi00x-pcm.o \
- digi00x-midi.o digi00x-hwdep.o
+ digi00x-midi.o digi00x-hwdep.o digi00x-protocol.o
obj-m += snd-digi00x.o
diff --git a/sound/firewire/digi00x/digi00x-hwdep.c b/sound/firewire/digi00x/digi00x-hwdep.c
index d629e41..a3e1c37 100644
--- a/sound/firewire/digi00x/digi00x-hwdep.c
+++ b/sound/firewire/digi00x/digi00x-hwdep.c
@@ -12,6 +12,7 @@
* 1.get firewire node information
* 2.get notification about starting/stopping stream
* 3.lock/unlock stream
+ * 4.get asynchronous messaging
*/
#include "digi00x.h"
@@ -25,7 +26,7 @@ static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
spin_lock_irq(&dg00x->lock);
- while (!dg00x->dev_lock_changed) {
+ while (!dg00x->dev_lock_changed && dg00x->msg == 0) {
prepare_to_wait(&dg00x->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
spin_unlock_irq(&dg00x->lock);
schedule();
@@ -42,6 +43,13 @@ static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
dg00x->dev_lock_changed = false;
count = min_t(long, count, sizeof(event.lock_status));
+ } else {
+ event.digi00x_message.type =
+ SNDRV_FIREWIRE_EVENT_DIGI00x_MESSAGE;
+ event.digi00x_message.message = dg00x->msg;
+ dg00x->msg = 0;
+
+ count = min_t(long, count, sizeof(event.digi00x_message));
}
spin_unlock_irq(&dg00x->lock);
@@ -61,7 +69,7 @@ static unsigned int hwdep_poll(struct snd_hwdep *hwdep, struct file *file,
poll_wait(file, &dg00x->hwdep_wait, wait);
spin_lock_irq(&dg00x->lock);
- if (dg00x->dev_lock_changed)
+ if (dg00x->dev_lock_changed || dg00x->msg)
events = POLLIN | POLLRDNORM;
else
events = 0;
diff --git a/sound/firewire/digi00x/digi00x-protocol.c b/sound/firewire/digi00x/digi00x-protocol.c
new file mode 100644
index 0000000..72c942a
--- /dev/null
+++ b/sound/firewire/digi00x/digi00x-protocol.c
@@ -0,0 +1,131 @@
+/*
+ * digi00x-protocol.c - a part of driver for Digidesign Digi 002/003 family
+ *
+ * Copyright (c) 2014-2015 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include "digi00x.h"
+
+static struct snd_dg00x *instances[SNDRV_CARDS];
+static DEFINE_SPINLOCK(instances_lock);
+
+/*
+ * Use the same range of address for asynchronous messages from any devices, to
+ * save resources on host controller.
+ */
+static struct fw_address_handler async_handler;
+
+static void handle_unknown_message(struct snd_dg00x *dg00x,
+ unsigned long long offset, u32 *buf)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&dg00x->lock, flags);
+ dg00x->msg = be32_to_cpu(*buf);
+ spin_unlock_irqrestore(&dg00x->lock, flags);
+
+ wake_up(&dg00x->hwdep_wait);
+}
+
+static void handle_message(struct fw_card *card, struct fw_request *request,
+ int tcode, int destination, int source,
+ int generation, unsigned long long offset,
+ void *data, size_t length, void *callback_data)
+{
+ u32 *buf = (__be32 *)data;
+ struct fw_device *device;
+ struct snd_dg00x *dg00x;
+ unsigned int i;
+
+ spin_lock_irq(&instances_lock);
+ for (i = 0; i < SNDRV_CARDS; i++) {
+ dg00x = instances[i];
+ if (dg00x == NULL)
+ continue;
+ device = fw_parent_device(dg00x->unit);
+ if (device->card != card)
+ continue;
+ smp_rmb(); /* node id vs. generation */
+ if (device->node_id != source)
+ continue;
+ break;
+ }
+
+ if (offset == async_handler.offset)
+ handle_unknown_message(dg00x, offset, buf);
+ else if (offset == async_handler.offset + 4)
+ handle_midi_control(dg00x, buf, length);
+
+ spin_unlock_irq(&instances_lock);
+ fw_send_response(card, request, RCODE_COMPLETE);
+}
+
+int snd_dg00x_protocol_add_instance(struct snd_dg00x *dg00x)
+{
+ struct fw_device *device = fw_parent_device(dg00x->unit);
+ __be32 data[2];
+ unsigned int i;
+ int err;
+
+ /* Unknown. 4bytes. */
+ data[0] = cpu_to_be32((device->card->node_id << 16) |
+ (async_handler.offset >> 32));
+ data[1] = cpu_to_be32(async_handler.offset);
+ err = snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST,
+ DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR,
+ &data, sizeof(data), 0);
+ if (err < 0)
+ return err;
+
+ spin_lock_irq(&instances_lock);
+ for (i = 0; i < SNDRV_CARDS; i++) {
+ if (instances[i] != NULL)
+ continue;
+ instances[i] = dg00x;
+ break;
+ }
+ spin_unlock_irq(&instances_lock);
+
+ return 0;
+}
+
+void snd_dg00x_protocol_remove_instance(struct snd_dg00x *dg00x)
+{
+ unsigned int i;
+
+ spin_lock_irq(&instances_lock);
+ for (i = 0; i < SNDRV_CARDS; i++) {
+ if (instances[i] != dg00x)
+ continue;
+ instances[i] = NULL;
+ break;
+ }
+ spin_unlock_irq(&instances_lock);
+}
+
+int snd_dg00x_protocol_register(void)
+{
+ static const struct fw_address_region resp_register_region = {
+ .start = 0xffffe0000000ull,
+ .end = 0xffffe000ffffull,
+ };
+ int err;
+
+ async_handler.length = 4;
+ async_handler.address_callback = handle_message;
+ async_handler.callback_data = NULL;
+
+ err = fw_core_add_address_handler(&async_handler,
+ &resp_register_region);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+void snd_dg00x_protocol_unregister(void)
+{
+ fw_core_remove_address_handler(&async_handler);
+}
diff --git a/sound/firewire/digi00x/digi00x.c b/sound/firewire/digi00x/digi00x.c
index c170cbb..db0997d 100644
--- a/sound/firewire/digi00x/digi00x.c
+++ b/sound/firewire/digi00x/digi00x.c
@@ -48,6 +48,7 @@ static void dg00x_card_free(struct snd_card *card)
struct snd_dg00x *dg00x = card->private_data;
snd_dg00x_stream_destroy_duplex(dg00x);
+ snd_dg00x_protocol_remove_instance(dg00x);
fw_unit_put(dg00x->unit);
@@ -99,6 +100,10 @@ static int snd_dg00x_probe(struct fw_unit *unit,
if (err < 0)
goto error;
+ err = snd_dg00x_protocol_add_instance(dg00x);
+ if (err < 0)
+ goto error;
+
err = snd_card_register(card);
if (err < 0)
goto error;
@@ -155,11 +160,18 @@ static struct fw_driver dg00x_driver = {
static int __init snd_dg00x_init(void)
{
+ int err;
+
+ err = snd_dg00x_protocol_register();
+ if (err < 0)
+ return err;
+
return driver_register(&dg00x_driver.driver);
}
static void __exit snd_dg00x_exit(void)
{
+ snd_dg00x_protocol_unregister();
driver_unregister(&dg00x_driver.driver);
}
diff --git a/sound/firewire/digi00x/digi00x.h b/sound/firewire/digi00x/digi00x.h
index 5d9beaf..4e3d359 100644
--- a/sound/firewire/digi00x/digi00x.h
+++ b/sound/firewire/digi00x/digi00x.h
@@ -53,6 +53,9 @@ struct snd_dg00x {
int dev_lock_count;
bool dev_lock_changed;
wait_queue_head_t hwdep_wait;
+
+ /* For asynchronous messages. */
+ u32 msg;
};
#define DG00X_ADDR_BASE 0xffffe0000000ull
@@ -103,6 +106,11 @@ enum snd_dg00x_optical_mode {
SND_DG00X_OPT_IFACE_MODE_COUNT,
};
+int snd_dg00x_protocol_add_instance(struct snd_dg00x *dg00x);
+void snd_dg00x_protocol_remove_instance(struct snd_dg00x *dg00x);
+int snd_dg00x_protocol_register(void);
+void snd_dg00x_protocol_unregister(void);
+
extern const unsigned int snd_dg00x_stream_rates[SND_DG00X_RATE_COUNT];
extern const unsigned int
snd_dg00x_stream_mbla_data_channels[SND_DG00X_RATE_COUNT];
--
2.1.0
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