| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef SOUND_FIREWIRE_CMP_H_INCLUDED |
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| 3 | #define SOUND_FIREWIRE_CMP_H_INCLUDED |
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| 4 | |
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| 5 | #include <linux/mutex.h> |
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| 6 | #include <linux/types.h> |
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| 7 | #include "iso-resources.h" |
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| 8 | |
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| 9 | struct fw_unit; |
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| 10 | |
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| 11 | enum cmp_direction { |
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| 12 | CMP_INPUT = 0, |
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| 13 | CMP_OUTPUT, |
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| 14 | }; |
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| 15 | |
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| 16 | /** |
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| 17 | * struct cmp_connection - manages an isochronous connection to a device |
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| 18 | * @speed: the connection's actual speed |
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| 19 | * |
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| 20 | * This structure manages (using CMP) an isochronous stream between the local |
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| 21 | * computer and a device's input plug (iPCR) and output plug (oPCR). |
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| 22 | * |
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| 23 | * There is no corresponding oPCR created on the local computer, so it is not |
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| 24 | * possible to overlay connections on top of this one. |
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| 25 | */ |
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| 26 | struct cmp_connection { |
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| 27 | int speed; |
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| 28 | /* private: */ |
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| 29 | bool connected; |
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| 30 | struct mutex mutex; |
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| 31 | struct fw_iso_resources resources; |
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| 32 | __be32 last_pcr_value; |
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| 33 | unsigned int pcr_index; |
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| 34 | unsigned int max_speed; |
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| 35 | enum cmp_direction direction; |
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| 36 | }; |
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| 37 | |
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| 38 | int cmp_connection_init(struct cmp_connection *connection, |
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| 39 | struct fw_unit *unit, |
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| 40 | enum cmp_direction direction, |
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| 41 | unsigned int pcr_index); |
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| 42 | int cmp_connection_check_used(struct cmp_connection *connection, bool *used); |
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| 43 | void cmp_connection_destroy(struct cmp_connection *connection); |
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| 44 | |
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| 45 | int cmp_connection_reserve(struct cmp_connection *connection, |
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| 46 | unsigned int max_payload); |
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| 47 | void cmp_connection_release(struct cmp_connection *connection); |
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| 48 | |
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| 49 | int cmp_connection_establish(struct cmp_connection *connection); |
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| 50 | int cmp_connection_update(struct cmp_connection *connection); |
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| 51 | void cmp_connection_break(struct cmp_connection *connection); |
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| 52 | |
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| 53 | #endif |
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| 54 | |
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