On 01/11/2017 04:03 PM, Takashi Iwai wrote:
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.
Okay. So we won't use "=".
One alternative is to use "." or "-" for a separator while converting
the existing such letters to a different one like "_".
It looks nice. Thanks for the tips! I'll use "-" as the separator, and
convert the the existing "-" in DMI strings to "_".
Thanks
Mengdong
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