diff options
Diffstat (limited to 'kernel/sound/firewire/iso-resources.h')
| -rw-r--r-- | kernel/sound/firewire/iso-resources.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/kernel/sound/firewire/iso-resources.h b/kernel/sound/firewire/iso-resources.h new file mode 100644 index 000000000..5a9af7c61 --- /dev/null +++ b/kernel/sound/firewire/iso-resources.h @@ -0,0 +1,38 @@ +#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; +}; + +int 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 |