From: Risto Suominen <Risto.Suominen@gmail.com>

Allow input from microphone on iMac G4 Flat-panel (Tumbler).

Signed-off-by: Risto Suominen <Risto.Suominen@gmail.com>
---
Kernel version 2.6.24 (probably any 2.6), ALSA 1.0.18.

--- a/alsa-kernel/ppc/pmac.c.org	2008-04-16 15:42:00.000000000 +0300
+++ b/alsa-kernel/ppc/pmac.c	2008-09-09 21:46:47.000000000 +0300
@@ -1033,7 +1033,7 @@
 	}
 	if (of_device_is_compatible(sound, "tumbler")) {
 		chip->model = PMAC_TUMBLER;
-		chip->can_capture = 0;  /* no capture */
+		chip->can_capture = machine_is_compatible("PowerMac4,2");
 		chip->can_duplex = 0;
 		// chip->can_byte_swap = 0; /* FIXME: check this */
 		chip->num_freqs = ARRAY_SIZE(tumbler_freqs);