54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef SOUND_FIREWIRE_CMP_H_INCLUDED
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#define SOUND_FIREWIRE_CMP_H_INCLUDED
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#include <linux/mutex.h>
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#include <linux/types.h>
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#include "iso-resources.h"
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struct fw_unit;
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enum cmp_direction {
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CMP_INPUT = 0,
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CMP_OUTPUT,
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};
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/**
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* struct cmp_connection - manages an isochronous connection to a device
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* @speed: the connection's actual speed
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*
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* This structure manages (using CMP) an isochronous stream between the local
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* computer and a device's input plug (iPCR) and output plug (oPCR).
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*
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* There is no corresponding oPCR created on the local computer, so it is not
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* possible to overlay connections on top of this one.
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*/
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struct cmp_connection {
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int speed;
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/* private: */
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bool connected;
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struct mutex mutex;
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struct fw_iso_resources resources;
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__be32 last_pcr_value;
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unsigned int pcr_index;
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unsigned int max_speed;
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enum cmp_direction direction;
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};
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int cmp_connection_init(struct cmp_connection *connection,
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struct fw_unit *unit,
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enum cmp_direction direction,
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unsigned int pcr_index);
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int cmp_connection_check_used(struct cmp_connection *connection, bool *used);
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void cmp_connection_destroy(struct cmp_connection *connection);
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int cmp_connection_reserve(struct cmp_connection *connection,
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unsigned int max_payload);
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void cmp_connection_release(struct cmp_connection *connection);
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int cmp_connection_establish(struct cmp_connection *connection);
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int cmp_connection_update(struct cmp_connection *connection);
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void cmp_connection_break(struct cmp_connection *connection);
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#endif
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