On Wed, 11 Jan 2017 07:32:11 +0100, Mengdong Lin wrote: > > > On 01/10/2017 03:09 PM, Takashi Iwai wrote: > > On Tue, 10 Jan 2017 07:42:49 +0100, > > mengdong.lin@xxxxxxxxxxxxxxx wrote: > >> > >> +/** > >> + * snd_soc_set_dmi_name() - Register DMI names to card > >> + * @card: The card to register DMI names > >> + * @flavour: The flavour "differentiator" for the card amongst its peers. > >> + * > >> + * An Intel machine driver may be used by many different devices but are > >> + * difficult for userspace to differentiate, since machine drivers ususally > >> + * use their own name as the card name (short name) and leave the card long > >> + * name blank. To differentiate such devices and fix bugs due to lack of > >> + * device-specific configurations, this function allows DMI info to be used > >> + * as the sound card long name, in the format of > >> + * "vendor.product.version.board" > >> + * (Character '.' are used to separate different DMI fields here). > >> + * This will help the userspace to load the correct UCM (Use Case Manager) > >> + * configuration. > >> + * > >> + * Possible card long names may be: > >> + * DellInc..XPS139343.01.0310JH > >> + * ASUSTeKCOMPUTERINC..T100TA.1.0.T100TA > >> + * Circuitco.MinnowboardMaxD0PLATFORM.D0.MinnowBoardMAX > >> + * (Please note DMI can also include '.' like"Inc." so you may see double '. > > ' > >> + * sometimes) > > > > Looking at the examples above, I wonder whether the dot is the best > > choice as the separator. Might other letters (e.g. ":" or "=") would > > be clearer? The colon might be bad if it were combined with the > > alsa-lib plugin syntax, but I guess it won't happen? > > > > Hi Takashi, > > I found we cannot use ":" as separator. It's because we want to use > the card long name as the name of the directory to store UCM > configuration files for this card, and Autoconf cannot support ":" in > the directory name. OK, fair enough. > Both "=" and "-" can work, which would you suggest to use? > I've not observed "-" or "=" in DMI fields till now, and I guess "=" > is less likely to be used by vendors. Yes, but OTOH, "=" would become tricky if you want to handle it in a shell script. One alternative is to use "." or "-" for a separator while converting the existing such letters to a different one like "_". thanks, Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel