1 files changed, 110 insertions, 0 deletions
diff --git a/target/linux/olpc/files/sound/pci/cs5535audio/cs5535audio_olpc.c b/target/linux/olpc/files/sound/pci/cs5535audio/cs5535audio_olpc.c
new file mode 100644
index 0000000000..791be73bfb
--- /dev/null
+++ b/target/linux/olpc/files/sound/pci/cs5535audio/cs5535audio_olpc.c
@@ -0,0 +1,110 @@
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/info.h>
+#include <sound/control.h>
+#include <sound/ac97_codec.h>
+
+#include <asm/olpc.h>
+#include "cs5535audio.h"
+
+/*
+ * 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 only supported on B2 and later models.
+ */
+
+int olpc_ai_enable(struct snd_ac97 *ac97, u8 val)
+{
+	int err;
+
+	/*
+	 * update the High Pass Filter (via AC97_AD_TEST2), and then set
+	 * Analog Input mode through a GPIO.
+	 */
+
+	if (val) {
+		err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
+				1<<AC97_AD_HPFD_SHIFT, 1<<AC97_AD_HPFD_SHIFT);
+		geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
+	}
+	else {
+		err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
+				1<<AC97_AD_HPFD_SHIFT, 0);
+		geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
+	}
+	if (err < 0)
+		snd_printk(KERN_ERR "Error updating AD_TEST2: %d\n", err);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(olpc_ai_enable);
+
+static int snd_cs5535audio_ai_info(struct snd_kcontrol *kcontrol,
+		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 snd_cs5535audio_ai_get(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_value *ucontrol)
+{
+	ucontrol->value.integer.value[0] = geode_gpio_isset(OLPC_GPIO_MIC_AC,
+			GPIO_OUTPUT_VAL);
+	return 0;
+}
+
+static int snd_cs5535audio_ai_put(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_value *ucontrol)
+{
+	struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol);
+	struct snd_ac97 *ac97 = cs5535au->ac97;
+
+	olpc_ai_enable(ac97, ucontrol->value.integer.value[0]);
+
+	return 1;
+}
+
+static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata =
+{
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "DC Mode Enable",
+	.info = snd_cs5535audio_ai_info,
+	.get = snd_cs5535audio_ai_get,
+	.put = snd_cs5535audio_ai_put,
+	.private_value = 0
+};
+
+void __devinit olpc_prequirks(struct snd_card *card,
+		struct snd_ac97_template *ac97)
+{
+	/* Bail if this isn't an OLPC platform */
+	if (!machine_is_olpc())
+		return;
+
+	/* If on an OLPC B3 or higher, invert EAPD. */
+	if (olpc_rev_after(OLPC_REV_B2))
+		ac97->scaps |= AC97_SCAP_INV_EAPD;
+}
+
+int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
+{
+	struct snd_ctl_elem_id elem;
+
+	/* Bail if this isn't an OLPC platform */
+	if (!machine_is_olpc())
+		return 0;
+
+	/* drop the original ad1888 HPF control */
+	memset(&elem, 0, sizeof(elem));
+	elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+	strcpy(elem.name, "High Pass Filter Enable");
+	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));
+}