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| author | Clemens Ladisch <clemens@ladisch.de> | 2011-03-15 07:53:21 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2011-03-15 08:42:22 +0100 |
| commit | 31ef9134eb52636d383a7d0626cbbd345cb94f2f (patch) | |
| tree | 5d994932a8773e844190cbea43ef31d67f605cf8 /sound/firewire/iso-resources.h | |
| parent | a5abba989deceb731047425812d268daf7536575 (diff) | |
| download | lwn-31ef9134eb52636d383a7d0626cbbd345cb94f2f.tar.gz lwn-31ef9134eb52636d383a7d0626cbbd345cb94f2f.zip | |
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/iso-resources.h')
| -rw-r--r-- | sound/firewire/iso-resources.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/sound/firewire/iso-resources.h b/sound/firewire/iso-resources.h new file mode 100644 index 000000000000..9feb9f8d4745 --- /dev/null +++ b/sound/firewire/iso-resources.h @@ -0,0 +1,39 @@ +#ifndef SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED +#define SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED + +#include <linux/mutex.h> +#include <linux/types.h> + +struct fw_unit; + +/** + * struct fw_iso_resources - manages channel/bandwidth allocation + * @channels_mask: if the device does not support all channel numbers, set this + * bit mask to something else than the default (all ones) + * + * This structure manages (de)allocation of isochronous resources (channel and + * bandwidth) for one isochronous stream. + */ +struct fw_iso_resources { + u64 channels_mask; + /* private: */ + struct fw_unit *unit; + struct mutex mutex; + unsigned int channel; + unsigned int bandwidth; /* in bandwidth units, without overhead */ + unsigned int bandwidth_overhead; + int generation; /* in which allocation is valid */ + bool allocated; + __be32 buffer[2]; +}; + +void fw_iso_resources_init(struct fw_iso_resources *r, + struct fw_unit *unit); +void fw_iso_resources_destroy(struct fw_iso_resources *r); + +int fw_iso_resources_allocate(struct fw_iso_resources *r, + unsigned int max_payload_bytes, int speed); +int fw_iso_resources_update(struct fw_iso_resources *r); +void fw_iso_resources_free(struct fw_iso_resources *r); + +#endif |