On Sun, 07 Aug 2016 11:48:41 +0200, Takashi Sakamoto wrote: > > This kernel API is used by kernel implementation. Currently, it's used for > kernel clients of ALSA sequencer, while it can be used for application > clients. The difference is just on address spaces of argument. In short, > this kernel API can be available for application client with data in kernel > space. > > This commit adds a document about this. > > Signed-off-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx> > --- > sound/core/seq/seq_clientmgr.c | 14 +++++++++++--- > 1 file changed, 11 insertions(+), 3 deletions(-) > > diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c > index 17d988a..a09cb84 100644 > --- a/sound/core/seq/seq_clientmgr.c > +++ b/sound/core/seq/seq_clientmgr.c > @@ -2494,9 +2494,17 @@ int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev, > > EXPORT_SYMBOL(snd_seq_kernel_client_dispatch); > > -/* > - * exported, called by kernel clients to perform same functions as with > - * userland ioctl() > +/** > + * snd_seq_kernel_client_ctl - operate a command for a client with data in > + * kernel space. > + * @clientid: A numerical ID for a client. > + * @cmd: An ioctl(2) command for ALSA sequencer operation. > + * @arg: A pointer to data in kernel space. > + * > + * Against its name, both kernel/application client can be handled by this > + * kernel API. Address space for 'arg' argument should be in kernel space. > + * > + * Return: 0 at success. Minus error code at failure. s/Minus/Negative/ Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
