ALSA: snd-aoa: handle master-amp if present

Some machines have a master amp GPIO that needs to be toggled to
get sound output, in addition to speaker/headphone/line-out amps.
This makes snd-aoa handle it, if present in the device tree, thus
making snd-aoa be able to output sound on PowerMac3,6, which was
previously handled by snd-powermac which also doesn't use the
master amp GPIO.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 16 insertions, 1 deletions

diff --git a/sound/aoa/core/gpio-feature.c b/sound/aoa/core/gpio-feature.c
index c93ad5dec66b..de8e03afa97b 100644
--- a/sound/aoa/core/gpio-feature.c
+++ b/sound/aoa/core/gpio-feature.c
@@ -14,7 +14,7 @@
 #include <linux/interrupt.h>
 #include "../aoa.h"
 
-/* TODO: these are 20 global variables
+/* TODO: these are lots of global variables
  * that aren't used on most machines...
  * Move them into a dynamically allocated
  * structure and use that.
@@ -23,6 +23,7 @@
 /* these are the GPIO numbers (register addresses as offsets into
  * the GPIO space) */
 static int headphone_mute_gpio;
+static int master_mute_gpio;
 static int amp_mute_gpio;
 static int lineout_mute_gpio;
 static int hw_reset_gpio;
@@ -32,6 +33,7 @@ static int linein_detect_gpio;
 
 /* see the SWITCH_GPIO macro */
 static int headphone_mute_gpio_activestate;
+static int master_mute_gpio_activestate;
 static int amp_mute_gpio_activestate;
 static int lineout_mute_gpio_activestate;
 static int hw_reset_gpio_activestate;
@@ -156,6 +158,7 @@ static int ftr_gpio_get_##name(struct gpio_runtime *rt)		\
 FTR_GPIO(headphone, 0);
 FTR_GPIO(amp, 1);
 FTR_GPIO(lineout, 2);
+FTR_GPIO(master, 3);
 
 static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
 {
@@ -172,6 +175,8 @@ static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
                           hw_reset_gpio, v);
 }
 
+static struct gpio_methods methods;
+
 static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
 {
         int saved;
@@ -181,6 +186,8 @@ static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
         ftr_gpio_set_headphone(rt, 0);
         ftr_gpio_set_amp(rt, 0);
         ftr_gpio_set_lineout(rt, 0);
+        if (methods.set_master)
+                ftr_gpio_set_master(rt, 0);
         rt->implementation_private = saved;
 }
 
@@ -193,6 +200,8 @@ static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
         ftr_gpio_set_headphone(rt, (s>>0)&1);
         ftr_gpio_set_amp(rt, (s>>1)&1);
         ftr_gpio_set_lineout(rt, (s>>2)&1);
+        if (methods.set_master)
+                ftr_gpio_set_master(rt, (s>>3)&1);
 }
 
 static void ftr_handle_notify(struct work_struct *work)
@@ -231,6 +240,12 @@ static void ftr_gpio_init(struct gpio_runtime *rt)
         get_gpio("hw-reset", "audio-hw-reset",
                  &hw_reset_gpio,
                  &hw_reset_gpio_activestate);
+        if (get_gpio("master-mute", NULL,
+                     &master_mute_gpio,
+                     &master_mute_gpio_activestate)) {
+                methods.set_master = ftr_gpio_set_master;
+                methods.get_master = ftr_gpio_get_master;
+        }
 
         headphone_detect_node = get_gpio("headphone-detect", NULL,
                                          &headphone_detect_gpio,