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https://github.com/torvalds/linux
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31ef9134eb
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>
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
#ifndef SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED
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#define SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED
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#include <linux/mutex.h>
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#include <linux/types.h>
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struct fw_unit;
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/**
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* struct fw_iso_resources - manages channel/bandwidth allocation
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* @channels_mask: if the device does not support all channel numbers, set this
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* bit mask to something else than the default (all ones)
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*
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* This structure manages (de)allocation of isochronous resources (channel and
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* bandwidth) for one isochronous stream.
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*/
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struct fw_iso_resources {
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u64 channels_mask;
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/* private: */
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struct fw_unit *unit;
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struct mutex mutex;
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unsigned int channel;
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unsigned int bandwidth; /* in bandwidth units, without overhead */
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unsigned int bandwidth_overhead;
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int generation; /* in which allocation is valid */
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bool allocated;
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__be32 buffer[2];
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};
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void fw_iso_resources_init(struct fw_iso_resources *r,
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struct fw_unit *unit);
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void fw_iso_resources_destroy(struct fw_iso_resources *r);
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int fw_iso_resources_allocate(struct fw_iso_resources *r,
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unsigned int max_payload_bytes, int speed);
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int fw_iso_resources_update(struct fw_iso_resources *r);
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void fw_iso_resources_free(struct fw_iso_resources *r);
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#endif
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