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| author | Clemens Ladisch <clemens@ladisch.de> | 2011-03-15 07:53:21 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2011-03-15 08:42:22 +0100 |
| commit | 31ef9134eb52636d383a7d0626cbbd345cb94f2f (patch) | |
| tree | 5d994932a8773e844190cbea43ef31d67f605cf8 /sound/firewire/cmp.h | |
| parent | a5abba989deceb731047425812d268daf7536575 (diff) | |
| download | linux-31ef9134eb52636d383a7d0626cbbd345cb94f2f.tar.bz2 | |
ALSA: add LaCie FireWire Speakers/Griffin FireWave Surround driver
Add a driver for two playback-only FireWire devices based on the OXFW970
chip.
v2: better AMDTP API abstraction; fix fw_unit leak; small fixes
v3: cache the iPCR value
v4: FireWave constraints; fix fw_device reference counting;
fix PCR caching; small changes and fixes
v5: volume/mute support; fix crashing due to pcm stop races
v6: fix build; one-channel volume for LaCie
v7: use signed values to make volume (range checks) work; fix function
block IDs for volume/mute; always use channel 0 for LaCie volume
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Tested-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/cmp.h')
| -rw-r--r-- | sound/firewire/cmp.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/sound/firewire/cmp.h b/sound/firewire/cmp.h new file mode 100644 index 000000000000..f47de08feb12 --- /dev/null +++ b/sound/firewire/cmp.h @@ -0,0 +1,41 @@ +#ifndef SOUND_FIREWIRE_CMP_H_INCLUDED +#define SOUND_FIREWIRE_CMP_H_INCLUDED + +#include <linux/mutex.h> +#include <linux/types.h> +#include "iso-resources.h" + +struct fw_unit; + +/** + * struct cmp_connection - manages an isochronous connection to a device + * @speed: the connection's actual speed + * + * This structure manages (using CMP) an isochronous stream from the local + * computer to a device's input plug (iPCR). + * + * There is no corresponding oPCR created on the local computer, so it is not + * possible to overlay connections on top of this one. + */ +struct cmp_connection { + int speed; + /* private: */ + bool connected; + struct mutex mutex; + struct fw_iso_resources resources; + __be32 last_pcr_value; + unsigned int pcr_index; + unsigned int max_speed; +}; + +int cmp_connection_init(struct cmp_connection *connection, + struct fw_unit *unit, + unsigned int ipcr_index); +void cmp_connection_destroy(struct cmp_connection *connection); + +int cmp_connection_establish(struct cmp_connection *connection, + unsigned int max_payload); +int cmp_connection_update(struct cmp_connection *connection); +void cmp_connection_break(struct cmp_connection *connection); + +#endif |