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  1. 29 Nov, 2014 5 commits
    • Takashi Sakamoto's avatar
      ALSA: dice: Split stream functionality into a file · 6eb6c81e
      Takashi Sakamoto authored 
      This commit adds a file with some helper functions for streaming, and move some
codes into the file with some arrangements.

Well-known CMP is not used to start/stop streams for Dice chipset. It's
achieved by writing to specific address. We call this way as 'enable'.
When devices are 'enabled', streaming starts in registered isochronous channel.
Some helper functions are already implemented in previous commit.

Basically, the stream is compliant to IEC 61883-6, so-called as AMDTP. But Dice
has a specific quirk, so called-as 'Dual Wire'. This quirk is applied at
176.4/192.0kHz. In this mode, each packet includes double number of events than
number in the specification, and stream runs at a half of sampling rate.

There is another quirk at bus reset. Dice chipset handles drivers' request but
don't re-enable streaming. So stream should be stopped.
Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      6eb6c81e
    • Takashi Sakamoto's avatar
      ALSA: dice: Split transaction functionality into a file · 7c2d4c0c
      Takashi Sakamoto authored 
      This commit adds a file with some helper functions for transaction, and move
some codes into the file with some arrangements.

For Dice chipset, well-known FCP or AV/C commands are not used to control
devices. It's achieved by read/write transactions into specific addresses.

Dice's address area is split into 5 areas. Each area has its own role. The
offset for each area can be got by reading head of the address area. By
reading these areas, drivers can get to know device status. By writing these
areas, drivers can change device status.

Dice has a specific mechanism called as 'notification'. When device status is
changed, Dice devices tells the event by sending transaction. This notification
is sent to an address which drivers register in advance. But this causes an
issue to drivers.

To handle the notification, drivers need to allocate its own callback function
to the address region in host controller. This region is exclusive. For the
other applications, drivers must give a mechanism to read the received
notification. For this purpose, Dice driver already implements hwdep interface.

Dice chipset doesn't allow drivers to register several addresses. In this
reason, when this driver is applied to a device, the other drivers should
_not_ try to register its own address to the device.
Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      7c2d4c0c
    • Takashi Sakamoto's avatar
      ALSA: dice: Move file to its own directory · 14ff6a09
      Takashi Sakamoto authored 
      In followed commits, dice driver is split into several files. For easily
managing these files, this commit adds subdirectory and move file into
the directory.
Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      14ff6a09
    • Takashi Sakamoto's avatar
      ALSA: dice: Rename structure and its members · 732d153f
      Takashi Sakamoto authored 
      Currently, dice driver supports AMDTP out-stream. In followed commits, AMDTP
in-stream will be supported but current name of members in dice structure
are not propper. This commit renames these members to proper name.

Additionally, for easily distinguishing local symbols from structure tag,
rename dice tag into snd_dice.
Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      732d153f
    • Takashi Sakamoto's avatar
      ALSA: dice: suppress checkpatch.pl warnings · 81fc5ad5
      Takashi Sakamoto authored 
      The checkpatch.pl generates some warnings due to:
 - C99 comment
 - a line over 80 characters
 - min() for parameters with different types
Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      81fc5ad5
  3. 28 Nov, 2014 5 commits
  5. 27 Nov, 2014 2 commits
  7. 22 Nov, 2014 11 commits
  9. 21 Nov, 2014 15 commits
  11. 20 Nov, 2014 2 commits
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