Add Mac mini sound support

The patch below adds sound support on the Mac Mini by making a small change to the PowerMac sound card detection code.

Details:

Original code:

chip->model = PMAC_AWACS;
...
if (device_is_compatible(sound, "AOAKeylargo")) {
...
chip->model = PMAC_SNAPPER;
...
}

The chip model is first set to AWACS, then because the check above returns true, it gets set to SNAPPER. Using AWACS gives perfect sound, using SNAPPER gives no sound at all, so it should use AWACS instead. Note that the mixer still doesn't work.

My simple patch makes the mentioned check return false on a Mac Mini.

Patch against 2.6.12-rc2:

diff -urpN -X dontdiff linux-2.6.12-rc2.orig/sound/ppc/pmac.c linux-2.6.12-rc2/sound/ppc/pmac.c
@@ -904,6 +904,8 @@ static int __init snd_pmac_detect(pmac_t
        else if (machine_is_compatible("PowerBook1,1")
                 || machine_is_compatible("AAPL,PowerBook1998"))
                chip->is_pbook_G3 = 1;
+       else if (machine_is_compatible("PowerMac10,1"))
+               chip->is_macmini = 1;
        chip->node = find_devices("awacs");
        if (chip->node)
                return 0; /* ok */

@@ -961,7 +963,7 @@ static int __init snd_pmac_detect(pmac_t
                chip->freq_table = tumbler_freqs;
                chip->control_mask = MASK_IEPC | 0x11; /* disable IEE */
        }
-       if (device_is_compatible(sound, "AOAKeylargo")) {
+       if (device_is_compatible(sound, "AOAKeylargo") && chip->is_macmini!=1) {
                /* Seems to support the stock AWACS frequencies, but has
                   a snapper mixer */
                chip->model = PMAC_SNAPPER;

diff -urpN -X dontdiff linux-2.6.12-rc2.orig/sound/ppc/pmac.h linux-2.6.12-rc2/sound/ppc/pmac.h
@@ -110,6 +110,7 @@ struct snd_pmac {
        unsigned int has_iic : 1;
        unsigned int is_pbook_3400 : 1;
        unsigned int is_pbook_G3 : 1;
+       unsigned int is_macmini : 1;
 
        unsigned int can_byte_swap : 1;
        unsigned int can_duplex : 1;

-------------

The patch was tested by checking if I got sound support with the patch applied on my Mac Mini.

Thanks to Owen Stampflee at Yellowdog Linux for discovering that sound works when setting chip->model=PMAC_AWACS on the mini.

Please CC replies.

Cheers,
Per Christian Henden

And is not correct. It might appear to work but it is not the right thing to do. There is no AWACS chip in there. There is a fixed function codec controlled by a couple of GPIOs afaik. I'm working on a major rework of the alsa driver that will include support for the mini and the G5s.

Ben.

change to the PowerMac sound card detection code.
[Snip, details]

Ok. It /does/ work, I've been using the AWACS driver for weeks now, and I don't have any stability or audio issues (that I notice), and my Mini is on 24/7.

People that want sound support on their Minis right away can use this patch while waiting for the rework of the drivers, without fear of their computer exploding or so.

Cheers,

PER