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Merge tag 'sound-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[mirror_ubuntu-artful-kernel.git] / sound / firewire / cmp.h
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1#ifndef SOUND_FIREWIRE_CMP_H_INCLUDED
2#define SOUND_FIREWIRE_CMP_H_INCLUDED
3
4#include <linux/mutex.h>
5#include <linux/types.h>
6#include "iso-resources.h"
7
8struct fw_unit;
9
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10enum cmp_direction {
11 CMP_INPUT = 0,
12 CMP_OUTPUT,
13};
14
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15/**
16 * struct cmp_connection - manages an isochronous connection to a device
17 * @speed: the connection's actual speed
18 *
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19 * This structure manages (using CMP) an isochronous stream between the local
20 * computer and a device's input plug (iPCR) and output plug (oPCR).
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21 *
22 * There is no corresponding oPCR created on the local computer, so it is not
23 * possible to overlay connections on top of this one.
24 */
25struct cmp_connection {
26 int speed;
27 /* private: */
28 bool connected;
29 struct mutex mutex;
30 struct fw_iso_resources resources;
31 __be32 last_pcr_value;
32 unsigned int pcr_index;
33 unsigned int max_speed;
c68a1c65 34 enum cmp_direction direction;
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35};
36
37int cmp_connection_init(struct cmp_connection *connection,
38 struct fw_unit *unit,
c68a1c65 39 enum cmp_direction direction,
a7fa0d04 40 unsigned int pcr_index);
b04479fb 41int cmp_connection_check_used(struct cmp_connection *connection, bool *used);
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42void cmp_connection_destroy(struct cmp_connection *connection);
43
44int cmp_connection_establish(struct cmp_connection *connection,
45 unsigned int max_payload);
46int cmp_connection_update(struct cmp_connection *connection);
47void cmp_connection_break(struct cmp_connection *connection);
48
49#endif