Sound: adding /proc/driver/{vendor}/{dev_pci}/ac97 entry
Alan mentioned that some cards make use of multiple codecs,
but also consider those of us that have multiple sound cards when forming the '/proc' pathname. As a quick&dirty hack to allow two 1371 cards to co-exist in /proc, I added the upper 8 bits of the address into the filename...
(One sound card dedicated to being used as a 1200 baud
modem for AX25 work, leaving one free for use as a normal soundcard)
regards
-Willy
William Robison
Quoted 9 lines · William Robison
Alan mentioned that some cards make use of multiple codecs,
but also consider those of us that have multiple sound cards when forming the '/proc' pathname. As a quick&dirty hack to allow two 1371 cards to co-exist in /proc, I added the upper 8 bits of the address into the filename...(One sound card dedicated to being used as a 1200 baud
modem for AX25 work, leaving one free for use as a normal soundcard)
My patch creates an entry that looks like it:
/proc/drivers/es1371/00:03.00/ac97
Where 00:03.00 is PCI bus == 00, 03 is card 3 of the bus and the last 00 is feature/chip on the card == 00.
This name is the unique name of the card created by the pci part of the kernel. Somebody pointed out that this will change to allow more than 256 elements, in this case the id will change and the module will create a correct unique name.
If you have 2 boards in the same PCI bus it will look like it:
/proc/drivers/es1371/00:03.00/ac97
/proc/drivers/es1371/00:04.00/ac97
If you have a board with a chip that implements 2 ESS1371/CT5880/... will look like it:
/proc/drivers/es1371/00:03.00/ac97
/proc/drivers/es1371/00:03.01/ac97
And if you have 2 boards in different PCI buses:
/proc/drivers/es1371/00:03.00/ac97
/proc/drivers/es1371/01:03.00/ac97
These are just examples but I think you get the idea and understand that there is no problem. What Alan pointed out (and he is 100% right) is that the same DC97 chip (ESS1371 for example) can have attached more than one AC97 codec (upto 4 according the spec) all using the AC-link communication. In this case the PCI bus, card number and feature number is the same for all the codecs. I'm resending a patch that will create it:
/proc/drivers/es1371/00:03.00/ac97-0
/proc/drivers/es1371/00:03.00/ac97-1
SET
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