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2021-09-30ALSA: virtio: Replace zero-length array with flexible-array memberGustavo A. R. Silva1-3/+2
There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. Also, make use of the struct_size() helper in kzalloc(). [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays Link: https://github.com/KSPP/linux/issues/78 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Link: https://lore.kernel.org/r/20210929191504.GA337268@embeddedor Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-04-27ALSA: virtio: fix kernel-docPierre-Louis Bossart1-1/+1
make W=1 warning: sound/virtio/virtio_ctl_msg.c:70: warning: expecting prototype for virtsnd_ctl_msg_request(). Prototype was for virtsnd_ctl_msg_response() instead Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20210426213902.234711-1-pierre-louis.bossart@linux.intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-04-12ALSA: virtio: use module_virtio_driver() to simplify the codeChen Huang1-11/+1
module_virtio_driver() makes the code simpler by eliminating boilerplate code. Signed-off-by: Chen Huang <chenhuang5@huawei.com> Reviewed-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210408125429.1158703-1-chenhuang5@huawei.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-07ALSA: virtio: introduce device suspend/resume supportAnton Yakovlev3-7/+85
All running PCM substreams are stopped on device suspend and restarted on device resume. Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210302164709.3142702-10-anton.yakovlev@opensynergy.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-07ALSA: virtio: introduce PCM channel map supportAnton Yakovlev5-0/+242
Enumerate all available PCM channel maps and create ALSA controls. Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210302164709.3142702-9-anton.yakovlev@opensynergy.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-07ALSA: virtio: introduce jack supportAnton Yakovlev4-0/+260
Enumerate all available jacks and create ALSA controls. At the moment jacks have a simple implementation and can only be used to receive notifications about a plugged in/out device. Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210302164709.3142702-8-anton.yakovlev@opensynergy.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-07ALSA: virtio: PCM substream operatorsAnton Yakovlev4-1/+454
Introduce the operators required for the operation of substreams. Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210302164709.3142702-7-anton.yakovlev@opensynergy.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-07ALSA: virtio: handling control and I/O messages for the PCM deviceAnton Yakovlev6-5/+515
The driver implements a message-based transport for I/O substream operations. Before the start of the substream, the hardware buffer is sliced into I/O messages, the number of which is equal to the current number of periods. The size of each message is equal to the current size of one period. I/O messages are organized in an ordered queue. The completion of the I/O message indicates an elapsed period (the only exception is the end of the stream for the capture substream). Upon completion, the message is automatically re-added to the end of the queue. Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210302164709.3142702-6-anton.yakovlev@opensynergy.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-07ALSA: virtio: build PCM devices and substream hardware descriptorsAnton Yakovlev5-1/+581
Like the HDA specification, the virtio sound device specification links PCM substreams, jacks and PCM channel maps into functional groups. For each discovered group, a PCM device is created, the number of which coincides with the group number. Introduce the module parameters for setting the hardware buffer parameters: pcm_buffer_ms [=160] pcm_periods_min [=2] pcm_periods_max [=16] pcm_period_ms_min [=10] pcm_period_ms_max [=80] Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210302164709.3142702-5-anton.yakovlev@opensynergy.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-07ALSA: virtio: handling control messagesAnton Yakovlev5-1/+410
The control queue can be used by different parts of the driver to send commands to the device. Control messages can be either synchronous or asynchronous. The lifetime of a message is controlled by a reference count. Introduce a module parameter to set the message completion timeout: msg_timeout_ms [=1000] Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210302164709.3142702-4-anton.yakovlev@opensynergy.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-07ALSA: virtio: add virtio sound driverAnton Yakovlev4-0/+406
Introduce skeleton of the virtio sound driver. The driver implements the virtio sound device specification, which has become part of the virtio standard. Initial initialization of the device, virtqueues and creation of an empty ALSA sound device. Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210302164709.3142702-3-anton.yakovlev@opensynergy.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
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