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2021-03-17module: remove never implemented MODULE_SUPPORTED_DEVICELeon Romanovsky1-1/+0
MODULE_SUPPORTED_DEVICE was added in pre-git era and never was implemented. We can safely remove it, because the kernel has grown to have many more reliable mechanisms to determine if device is supported or not. Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-07-09ALSA: xen: Remove superfluous fall through commentsTakashi Iwai1-4/+0
The "fall through" comments found in switch-cases in ALSA xen driver are all superfluous. The kernel coding style allows the multiple cases in a row. Let's remove them. Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Link: https://lore.kernel.org/r/20200709111750.8337-3-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-07-07ALSA: xen: remove 'set but not used' warningPierre-Louis Bossart1-1/+1
Fix W=1 warning. Mark the 'req' variable as __always_unused. sound/xen/xen_snd_front.c: In function ‘xen_snd_front_stream_close’: sound/xen/xen_snd_front.c:117:21: warning: variable ‘req’ set but not used [-Wunused-but-set-variable] 117 | struct xensnd_req *req; | ^~~ Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20200702193604.169059-18-pierre-louis.bossart@linux.intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-12-18ALSA: xen-front: Use Xen common shared buffer implementationOleksandr Andrushchenko1-3/+4
Use page directory based shared buffer implementation now available as common code for Xen frontend drivers. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
2018-05-31ALSA: xen-front: fix a loop timeoutDan Carpenter1-1/+1
We want the loop to exit when "to" is set to zero, but in the current code it's set to -1. Also I tweaked the indenting so it doesn't look like we're passing "--to" to xenbus_read_unsigned(). Fixes: cc3196ae197c ("ALSA: xen-front: Introduce Xen para-virtualized sound frontend driver") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-05-16ALSA: xen-front: Implement ALSA virtual sound driverOleksandr Andrushchenko1-1/+180
Implement essential initialization of the sound driver: - introduce required data structures - handle driver registration - handle sound card registration - register sound driver on backend connection - remove sound driver on backend disconnect Initialize virtual sound card with streams according to the Xen store configuration. Implement ALSA driver operations including: - manage frontend/backend shared buffers - manage Xen bus event channel states Implement requests from front to back for ALSA PCM operations. - report ALSA period elapsed event: handle XENSND_EVT_CUR_POS notifications from the backend when stream position advances during playback/capture. The event carries a value of how many octets were played/captured at the time of the event. - implement explicit stream parameter negotiation between backend and frontend: handle XENSND_OP_HW_PARAM_QUERY request to read/update configuration space for the parameter given: request passes desired parameter interval and the response to this request returns min/max interval for the parameter to be used. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-05-16ALSA: xen-front: Implement handling of shared buffersOleksandr Andrushchenko1-0/+8
Implement shared buffer handling according to the para-virtualized sound device protocol at xen/interface/io/sndif.h: - manage buffer memory - handle granted references - handle page directories [ Fixed missing linux/kernel.h inclusion -- tiwai ] Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-05-16ALSA: xen-front: Implement Xen event channel handlingOleksandr Andrushchenko1-1/+8
Handle Xen event channels: - create for all configured streams and publish corresponding ring references and event channels in Xen store, so backend can connect - implement event channels interrupt handlers - create and destroy event channels with respect to Xen bus state Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-05-16ALSA: xen-front: Read sound driver configuration from Xen storeOleksandr Andrushchenko1-0/+7
Read configuration values from Xen store according to xen/interface/io/sndif.h protocol: - introduce configuration structures for different components, e.g. sound card, device, stream - read PCM HW parameters, e.g rate, format etc. - detect stream type (capture/playback) - read device and card parameters Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-05-16ALSA: xen-front: Introduce Xen para-virtualized sound frontend driverOleksandr Andrushchenko1-0/+196
Introduce skeleton of the para-virtualized Xen sound frontend driver. Initial handling for Xen bus states: implement Xen bus state machine for the frontend driver according to the state diagram and recovery flow from sound para-virtualized protocol: xen/interface/io/sndif.h. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>