[RFC][PATCH v6 0/1] audio jack software injection

[Hui Wang]

the changes in the v6:
 - use the sizeof(buf) to replace the digits in the scnprintf
 - squash the document patch into the 0001-xxx.patch.


the changes in the v5:
 - add a Kconfig to enable/disable the jack injection feature
 - replace all kzalloc with local char[] in the debugfs fops
 - replace the chars of !isalnum() to '_' for the jack folder's name
 - squash all .c files patches into one patch
 - add a document to explain jack injection, for easier review, put
   the document in a standalone patch. If needed, will squash this
   patch to the previous one.
 

the changes in the v4:
 - change the sound-core to sound and change the sound_core_debugfs_root
   to sound_debugfs_root in the 0001-xxx.patch
 - change kzalloc/kfree to kvzalloc/kvfree in the debugfs fops for
   0001-xxx.patch and 0003-xxx.patch
 - And if needed, I could squash 4 patches into 1 patch before merging.

the changes in the v3 (for easy to review, divide change into 4 patches):
 - address the comment about the snd_jack_report() and _snd_jack_report(),
   the v2 design is hard to understand and is hard to review, in the v3,
   separate the jack_report to snd_jack_report() and snd_jack_inject_report(),
   hw jack events call snd_jack_report() as before, if a jack contains multi
   jack_kctl and the jack_kctl's sw_inject is enabled, the status and the
   related input-dev's events will not be reproted. The injection events call
   snd_jack_inject_report(). This change is squashed to 0001-xxx.patch,  the
   rest part of 0001-xxx.patch is same as v2.

 - address the comment about folders'name in the 0002-xxx.patch, so far, drop
   the '/', ',', '=' and ' ' from the folders' name.

 - address the comment about adding more debugfs nodes in the 0003-xxx.patch,
   it adds kctl_id, mask_bits, status and type.

 - address the comment about save-n-restore jack's hw status in the
   0004-xxx.patch, adding a hw_status_cache and save the last reported jack
   hw event, once the sw_inject is disabled, will restore all jack_kctl's
   state under the same snd_jack with hw_status_cache.
[snip]


the changes in the V2:
 - using debugfs instead of sysfs
 - using jack_ctrl to create a folder instead of snd_jack, since ASoC drivers
   could create multi jack_ctrls within a snd_jack
 - create a folder for each jack_ctrl instead for all jack_ctrls
[ snip ]

Hui Wang (1):
  alsa: jack: implement software jack injection via debugfs

 Documentation/sound/designs/index.rst         |   1 +
 .../sound/designs/jack-injection.rst          | 124 ++++++++
 include/sound/core.h                          |   2 +
 include/sound/jack.h                          |   1 +
 sound/core/Kconfig                            |   9 +
 sound/core/init.c                             |  10 +
 sound/core/jack.c                             | 298 +++++++++++++++++-
 sound/core/sound.c                            |   8 +
 8 files changed, 449 insertions(+), 4 deletions(-)
 create mode 100644 Documentation/sound/designs/jack-injection.rst

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