2 files changed, 26 insertions, 30 deletions

diff --git a/sound/pci/cs5535audio/cs5535audio.h b/sound/pci/cs5535audio/cs5535audio.h
index 31ecb33ffff9..22737fc9ed03 100644
--- a/sound/pci/cs5535audio/cs5535audio.h
+++ b/sound/pci/cs5535audio/cs5535audio.h
@@ -103,6 +103,7 @@ int snd_cs5535audio_resume(struct pci_dev *pci);
 void __devinit olpc_prequirks(struct snd_card *card,
                 struct snd_ac97_template *ac97);
 int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97);
+void olpc_analog_input(struct snd_ac97 *ac97, int on);
 #else
 static inline void olpc_prequirks(struct snd_card *card,
                 struct snd_ac97_template *ac97) { }
@@ -110,6 +111,7 @@ static inline int olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
 {
         return 0;
 }
+static inline void olpc_analog_input(struct snd_ac97 *ac97, int on) { }
 #endif
 
 int __devinit snd_cs5535audio_pcm(struct cs5535audio *cs5535audio);
diff --git a/sound/pci/cs5535audio/cs5535audio_olpc.c b/sound/pci/cs5535audio/cs5535audio_olpc.c
index f20e74182725..597395e6e358 100644
--- a/sound/pci/cs5535audio/cs5535audio_olpc.c
+++ b/sound/pci/cs5535audio/cs5535audio_olpc.c
@@ -7,12 +7,29 @@
 #include <asm/olpc.h>
 #include "cs5535audio.h"
 
-/* OLPC has an additional feature on top of regular AD1888 codec
-features. This is support for an analog input mode. This is a
-2 step process. First, to turn off the AD1888 codec bias voltage
-and high pass filter. Second, to tell the embedded controller to
-reroute from a capacitive trace to a direct trace using an analog
-switch. The *_ec()s are what talk to that controller */
+/*
+ * OLPC has an additional feature on top of the regular AD1888 codec features.
+ * It has an Analog Input mode that is switched into (after disabling the
+ * High Pass Filter) via GPIO.  It is supported on B2 and later models.
+ */
+void olpc_analog_input(struct snd_ac97 *ac97, int on)
+{
+        int err;
+
+        /* update the High Pass Filter (via AC97_AD_TEST2) */
+        err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
+                        1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT);
+        if (err < 0) {
+                snd_printk(KERN_ERR "setting High Pass Filter - %d\n", err);
+                return;
+        }
+
+        /* set Analog Input through GPIO */
+        if (on)
+                geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
+        else
+                geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
+}
 
 static int snd_cs5535audio_ctl_info(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_info *uinfo)
@@ -24,8 +41,6 @@ static int snd_cs5535audio_ctl_info(struct snd_kcontrol *kcontrol,
         return 0;
 }
 
-#define AD1888_VREFOUT_EN_BIT (1 << 2)
-#define AD1888_HPF_EN_BIT (1 << 12)
 static int snd_cs5535audio_ctl_get(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_value *ucontrol)
 {
@@ -42,30 +57,9 @@ static int snd_cs5535audio_ctl_get(struct snd_kcontrol *kcontrol,
 static int snd_cs5535audio_ctl_put(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_value *ucontrol)
 {
-        int err;
         struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol);
-        u8 value;
-        struct snd_ac97 *ac97 = cs5535au->ac97;
-
-        /* value is 1 if analog input is desired */
-        value = ucontrol->value.integer.value[0];
-
-        /* turns off High Pass Filter if 1 */
-        if (value)
-                err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
-                                AD1888_HPF_EN_BIT, AD1888_HPF_EN_BIT);
-        else
-                err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
-                                AD1888_HPF_EN_BIT, 0);
-        if (err < 0)
-                snd_printk(KERN_ERR "Error updating AD_TEST2 %d\n", err);
-
-        /* B2 and newer writes directly to a GPIO pin */
-        if (value)
-                geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
-        else
-                geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
 
+        olpc_analog_input(cs5535au->ac97, ucontrol->value.integer.value[0]);
         return 1;
 }