3 files changed, 87 insertions, 19 deletions

diff --git a/sound/pci/cs5535audio/cs5535audio.h b/sound/pci/cs5535audio/cs5535audio.h
index 22737fc9ed03..63190cd723c6 100644
--- a/sound/pci/cs5535audio/cs5535audio.h
+++ b/sound/pci/cs5535audio/cs5535audio.h
@@ -104,6 +104,19 @@ 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);
+void olpc_mic_bias(struct snd_ac97 *ac97, int on);
+
+static inline void olpc_capture_open(struct snd_ac97 *ac97)
+{
+        /* enable MIC Bias for recording */
+        olpc_mic_bias(ac97, 1);
+}
+
+static inline void olpc_capture_close(struct snd_ac97 *ac97)
+{
+        /* disable the MIC Bias (so the recording LED turns off) */
+        olpc_mic_bias(ac97, 0);
+}
 #else
 static inline void olpc_prequirks(struct snd_card *card,
                 struct snd_ac97_template *ac97) { }
@@ -112,6 +125,9 @@ 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) { }
+static inline void olpc_mic_bias(struct snd_ac97 *ac97, int on) { }
+static inline void olpc_capture_open(struct snd_ac97 *ac97) { }
+static inline void olpc_capture_close(struct snd_ac97 *ac97) { }
 #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 7f26cfbc8f52..73811e0e8ac7 100644
--- a/sound/pci/cs5535audio/cs5535audio_olpc.c
+++ b/sound/pci/cs5535audio/cs5535audio_olpc.c
@@ -31,6 +31,20 @@ void olpc_analog_input(struct snd_ac97 *ac97, int on)
                 geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
 }
 
+/*
+ * OLPC XO-1's V_REFOUT is a mic bias enable.
+ */
+void olpc_mic_bias(struct snd_ac97 *ac97, int on)
+{
+        int err;
+
+        on = on ? 0 : 1;
+        err = snd_ac97_update_bits(ac97, AC97_AD_MISC,
+                        1 << AC97_AD_VREFD_SHIFT, on << AC97_AD_VREFD_SHIFT);
+        if (err < 0)
+                snd_printk(KERN_ERR "setting MIC Bias - %d\n", err);
+}
+
 static int olpc_dc_info(struct snd_kcontrol *kctl,
                 struct snd_ctl_elem_info *uinfo)
 {
@@ -56,7 +70,36 @@ static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
         return 1;
 }
 
-static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata =
+static int olpc_mic_info(struct snd_kcontrol *kctl,
+                struct snd_ctl_elem_info *uinfo)
+{
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+        uinfo->count = 1;
+        uinfo->value.integer.min = 0;
+        uinfo->value.integer.max = 1;
+        return 0;
+}
+
+static int olpc_mic_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
+{
+        struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
+        struct snd_ac97 *ac97 = cs5535au->ac97;
+        int i;
+
+        i = (snd_ac97_read(ac97, AC97_AD_MISC) >> AC97_AD_VREFD_SHIFT) & 0x1;
+        v->value.integer.value[0] = i ? 0 : 1;
+        return 0;
+}
+
+static int olpc_mic_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
+{
+        struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
+
+        olpc_mic_bias(cs5535au->ac97, v->value.integer.value[0]);
+        return 1;
+}
+
+static struct snd_kcontrol_new olpc_cs5535audio_ctls[] __devinitdata = {
 {
         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
         .name = "DC Mode Enable",
@@ -64,6 +107,15 @@ static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata =
         .get = olpc_dc_get,
         .put = olpc_dc_put,
         .private_value = 0
+},
+{
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .name = "MIC Bias Enable",
+        .info = olpc_mic_info,
+        .get = olpc_mic_get,
+        .put = olpc_mic_put,
+        .private_value = 0,
+},
 };
 
 void __devinit olpc_prequirks(struct snd_card *card,
@@ -80,6 +132,7 @@ void __devinit olpc_prequirks(struct snd_card *card,
 int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
 {
         struct snd_ctl_elem_id elem;
+        int i, err;
 
         if (!machine_is_olpc())
                 return 0;
@@ -90,8 +143,20 @@ int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
         strncpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));
         snd_ctl_remove_id(card, &elem);
 
-        /* add the override for OLPC's HPF */
-        return snd_ctl_add(card, snd_ctl_new1(&snd_cs5535audio_controls,
-                                                ac97->private_data));
+        /* drop the original V_REFOUT control */
+        memset(&elem, 0, sizeof(elem));
+        elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+        strncpy(elem.name, "V_REFOUT Enable", sizeof(elem.name));
+        snd_ctl_remove_id(card, &elem);
+
+        /* add the OLPC-specific controls */
+        for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) {
+                err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i],
+                                ac97->private_data));
+                if (err < 0)
+                        return err;
+        }
+
+        return 0;
 }
 
diff --git a/sound/pci/cs5535audio/cs5535audio_pcm.c b/sound/pci/cs5535audio/cs5535audio_pcm.c
index fa2a6b1b81a6..0f48a871f17b 100644
--- a/sound/pci/cs5535audio/cs5535audio_pcm.c
+++ b/sound/pci/cs5535audio/cs5535audio_pcm.c
@@ -363,27 +363,14 @@ static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
         if ((err = snd_pcm_hw_constraint_integer(runtime,
                                          SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
                 return err;
-
-#ifdef CONFIG_OLPC
-        /* Enable the V_ref bias only while recording. */
-        err = snd_ac97_update_bits(cs5535au->ac97, AC97_AD_MISC,
-                        1 << AC97_AD_VREFD_SHIFT, 0);
-        if (err < 0)
-                snd_printk(KERN_ERR "Error updating AD_MISC %d\n", err);
-#endif
+        olpc_capture_open(cs5535au->ac97);
         return 0;
 }
 
 static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream)
 {
-        int err;
         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
-
-#ifdef CONFIG_OLPC
-        /* Disable V_ref bias. */
-        err = snd_ac97_update_bits(cs5535au->ac97, AC97_AD_MISC,
-                        1 << AC97_AD_VREFD_SHIFT, 1 << AC97_AD_VREFD_SHIFT);
-#endif
+        olpc_capture_close(cs5535au->ac97);
         return 0;
 }