| 1 |
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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 | |
| 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 |
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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 | void cmp_connection_break(struct cmp_connection *connection);
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| 51 |
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| 52 | #endif
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