1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED 3 #define SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED 4 5 #include <linux/mutex.h> 6 #include <linux/types.h> 7 8 struct fw_unit; 9 10 /** 11 * struct fw_iso_resources - manages channel/bandwidth allocation 12 * @channels_mask: if the device does not support all channel numbers, set this 13 * bit mask to something else than the default (all ones) 14 * 15 * This structure manages (de)allocation of isochronous resources (channel and 16 * bandwidth) for one isochronous stream. 17 */ 18 struct fw_iso_resources { 19 u64 channels_mask; 20 /* private: */ 21 struct fw_unit *unit; 22 struct mutex mutex; 23 unsigned int channel; 24 unsigned int bandwidth; /* in bandwidth units, without overhead */ 25 unsigned int bandwidth_overhead; 26 int generation; /* in which allocation is valid */ 27 bool allocated; 28 }; 29 30 int fw_iso_resources_init(struct fw_iso_resources *r, 31 struct fw_unit *unit); 32 void fw_iso_resources_destroy(struct fw_iso_resources *r); 33 34 int fw_iso_resources_allocate(struct fw_iso_resources *r, 35 unsigned int max_payload_bytes, int speed); 36 int fw_iso_resources_update(struct fw_iso_resources *r); 37 void fw_iso_resources_free(struct fw_iso_resources *r); 38 39 #endif 40