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https://github.com/torvalds/linux
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b04479fb85
Plug Control Registers have two fields related to the number of established connections, one is 'Broadcast connection counter' and another is 'Point-to-point connection counter'. The driver can know there are established connections or not to check these fields. This commit is for considering about JACK/FFADO streaming. Currently, when JACK/FFADO starts its streaming to the device, cmp_connection_establish() is failed expectedly. This seems to be enough but there are some devices which needs to change sampling frequency before trying to establish connections. For such devices, this functionality is needed. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
#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
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