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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/packets-buffer.h
parenta5abba989deceb731047425812d268daf7536575 (diff)
downloadlinux-31ef9134eb52636d383a7d0626cbbd345cb94f2f.tar.bz2
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/packets-buffer.h')
-rw-r--r--sound/firewire/packets-buffer.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/sound/firewire/packets-buffer.h b/sound/firewire/packets-buffer.h
new file mode 100644
index 000000000000..6513c5cb6ea9
--- /dev/null
+++ b/sound/firewire/packets-buffer.h
@@ -0,0 +1,26 @@
+#ifndef SOUND_FIREWIRE_PACKETS_BUFFER_H_INCLUDED
+#define SOUND_FIREWIRE_PACKETS_BUFFER_H_INCLUDED
+
+#include <linux/dma-mapping.h>
+#include <linux/firewire.h>
+
+/**
+ * struct iso_packets_buffer - manages a buffer for many packets
+ * @iso_buffer: the memory containing the packets
+ * @packets: an array, with each element pointing to one packet
+ */
+struct iso_packets_buffer {
+ struct fw_iso_buffer iso_buffer;
+ struct {
+ void *buffer;
+ unsigned int offset;
+ } *packets;
+};
+
+int iso_packets_buffer_init(struct iso_packets_buffer *b, struct fw_unit *unit,
+ unsigned int count, unsigned int packet_size,
+ enum dma_data_direction direction);
+void iso_packets_buffer_destroy(struct iso_packets_buffer *b,
+ struct fw_unit *unit);
+
+#endif