thanks. looking at the codes, it seems that no special handling for the chip. it simply sets up the ac97 registers.
the patch below is a quick hack to set the spdif rate on the first playback pcm device. in addition, you'll need to set up the following mixer controls:
- 'IEC958 AC97-SPSA' to 0 (slots 3/4). - 'IEC958 Playback Switch' to on.
you might need to set up 'IEC958 Playback Default', too, but it might not... try once the above two switches at first.
Takashi
I have done some further investigation, and have discovered the type of ac97 chip used.
I attach output from the ac97#0regs /proc/asound/card0 file.
Here is the url to download datasheets of the chip.
It is an ALC650 Chip.
http://www.realtek.com.tw/downloads/downloads1-3.aspx?lineid=5&famid=All&series=8&refdesign=True
From my analysis, I think that we should be setting bit 2 of register 0x2a to get SPDIF out.
Is it possible to set this via alsamixer, or do I now have to open the device with a particular name, e.g. iec958:AES0=0x6,AES1=0x82,AES2=0x0,AES3=0x2
The chip can set non-audio bits etc, so we should really be able to support opening with the iec958:...etc. name.
If you think I am on the right lines here, then what functions do we have to add to get it to parse iec958 lines correctly.
Cheers James
0:00 = 5980 0:02 = 9f1f 0:04 = 0000 0:06 = 801f 0:08 = 0000 0:0a = 801e 0:0c = 801f 0:0e = 801f 0:10 = 9f1f 0:12 = 9f1f 0:14 = 9f1f 0:16 = 9f1f 0:18 = 9f1f 0:1a = 0000 0:1c = 0000 0:1e = 0000 0:20 = 0000 0:22 = 0000 0:24 = 0000 0:26 = 000f 0:28 = 05c7 0:2a = 05c1 0:2c = bb80 0:2e = bb80 0:30 = bb80 0:32 = bb80 0:34 = 0000 0:36 = 9f80 0:38 = 9f9f 0:3a = 2000 0:3c = 0000 0:3e = 0000 0:40 = 0000 0:42 = 0000 0:44 = 0000 0:46 = 0000 0:48 = 0000 0:4a = 0000 0:4c = 0000 0:4e = 0000 0:50 = 0000 0:52 = 0000 0:54 = 0000 0:56 = 0000 0:58 = 0000 0:5a = 0000 0:5c = 0000 0:5e = 0000 0:60 = 0000 0:62 = 0000 0:64 = 0808 0:66 = 0808 0:68 = 0000 0:6a = 0000 0:6c = 0000 0:6e = 0014 0:70 = 0211 0:72 = 00a0 0:74 = 0043 0:76 = 0001 0:78 = 0102 0:7a = 57c6 0:7c = 414c 0:7e = 4720
