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Viewing changes to firewire/cmp.h

  • Committer: Hui Wang
  • Date: 2019-04-02 08:15:36 UTC
  • Revision ID: hui.wang@canonical.com-20190402081536-jotgnsumg56flsga
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firewire/cmp.h
 
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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_establish(struct cmp_connection *connection,
 
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                             unsigned int max_payload);
 
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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