| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef SOUND_FIREWIRE_CMP_H_INCLUDED |
| 3 | #define SOUND_FIREWIRE_CMP_H_INCLUDED |
| 4 | |
| 5 | #include <linux/mutex.h> |
| 6 | #include <linux/types.h> |
| 7 | #include "iso-resources.h" |
| 8 | |
| 9 | struct fw_unit; |
| 10 | |
| 11 | enum cmp_direction { |
| 12 | CMP_INPUT = 0, |
| 13 | CMP_OUTPUT, |
| 14 | }; |
| 15 | |
| 16 | /** |
| 17 | * struct cmp_connection - manages an isochronous connection to a device |
| 18 | * @speed: the connection's actual speed |
| 19 | * |
| 20 | * This structure manages (using CMP) an isochronous stream between the local |
| 21 | * computer and a device's input plug (iPCR) and output plug (oPCR). |
| 22 | * |
| 23 | * There is no corresponding oPCR created on the local computer, so it is not |
| 24 | * possible to overlay connections on top of this one. |
| 25 | */ |
| 26 | struct cmp_connection { |
| 27 | int speed; |
| 28 | /* private: */ |
| 29 | bool connected; |
| 30 | struct mutex mutex; |
| 31 | struct fw_iso_resources resources; |
| 32 | __be32 last_pcr_value; |
| 33 | unsigned int pcr_index; |
| 34 | unsigned int max_speed; |
| 35 | enum cmp_direction direction; |
| 36 | }; |
| 37 | |
| 38 | int cmp_connection_init(struct cmp_connection *connection, |
| 39 | struct fw_unit *unit, |
| 40 | enum cmp_direction direction, |
| 41 | unsigned int pcr_index); |
| 42 | int cmp_connection_check_used(struct cmp_connection *connection, bool *used); |
| 43 | void cmp_connection_destroy(struct cmp_connection *connection); |
| 44 | |
| 45 | int cmp_connection_establish(struct cmp_connection *connection, |
| 46 | unsigned int max_payload); |
| 47 | int cmp_connection_update(struct cmp_connection *connection); |
| 48 | void cmp_connection_break(struct cmp_connection *connection); |
| 49 | |
| 50 | #endif |