summaryrefslogtreecommitdiff
path: root/sound/firewire/cmp.h
diff options
context:
space:
mode:
authorClemens Ladisch <clemens@ladisch.de>2011-03-15 07:53:21 +0100
committerTakashi Iwai <tiwai@suse.de>2011-03-15 08:42:22 +0100
commit31ef9134eb52636d383a7d0626cbbd345cb94f2f (patch)
tree5d994932a8773e844190cbea43ef31d67f605cf8 /sound/firewire/cmp.h
parenta5abba989deceb731047425812d268daf7536575 (diff)
ALSA: add LaCie FireWire Speakers/Griffin FireWave Surround driver
Add a driver for two playback-only FireWire devices based on the OXFW970 chip. v2: better AMDTP API abstraction; fix fw_unit leak; small fixes v3: cache the iPCR value v4: FireWave constraints; fix fw_device reference counting; fix PCR caching; small changes and fixes v5: volume/mute support; fix crashing due to pcm stop races v6: fix build; one-channel volume for LaCie v7: use signed values to make volume (range checks) work; fix function block IDs for volume/mute; always use channel 0 for LaCie volume Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Tested-by: Jay Fenlason <fenlason@redhat.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/cmp.h')
-rw-r--r--sound/firewire/cmp.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/sound/firewire/cmp.h b/sound/firewire/cmp.h
new file mode 100644
index 000000000000..f47de08feb12
--- /dev/null
+++ b/sound/firewire/cmp.h
@@ -0,0 +1,41 @@
+#ifndef SOUND_FIREWIRE_CMP_H_INCLUDED
+#define SOUND_FIREWIRE_CMP_H_INCLUDED
+
+#include <linux/mutex.h>
+#include <linux/types.h>
+#include "iso-resources.h"
+
+struct fw_unit;
+
+/**
+ * struct cmp_connection - manages an isochronous connection to a device
+ * @speed: the connection's actual speed
+ *
+ * This structure manages (using CMP) an isochronous stream from the local
+ * computer to a device's input plug (iPCR).
+ *
+ * There is no corresponding oPCR created on the local computer, so it is not
+ * possible to overlay connections on top of this one.
+ */
+struct cmp_connection {
+ int speed;
+ /* private: */
+ bool connected;
+ struct mutex mutex;
+ struct fw_iso_resources resources;
+ __be32 last_pcr_value;
+ unsigned int pcr_index;
+ unsigned int max_speed;
+};
+
+int cmp_connection_init(struct cmp_connection *connection,
+ struct fw_unit *unit,
+ unsigned int ipcr_index);
+void cmp_connection_destroy(struct cmp_connection *connection);
+
+int cmp_connection_establish(struct cmp_connection *connection,
+ unsigned int max_payload);
+int cmp_connection_update(struct cmp_connection *connection);
+void cmp_connection_break(struct cmp_connection *connection);
+
+#endif