--- /dev/null
+/*
+ * OLPC XO-1 additional sound features
+ *
+ * Copyright © 2006 Jaya Kumar <jayakumar.lkml@gmail.com>
+ * Copyright © 2007-2008 Andres Salomon <dilinger@debian.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <sound/core.h>
+#include <sound/info.h>
+#include <sound/control.h>
+#include <sound/ac97_codec.h>
+#include <linux/gpio.h>
+
+#include <asm/olpc.h>
+#include "cs5535audio.h"
+
+#define DRV_NAME "cs5535audio-olpc"
+
+/*
+ * 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;
+
+ if (!machine_is_olpc())
+ return;
+
+ /* 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) {
+ dev_err(ac97->bus->card->dev,
+ "setting High Pass Filter - %d\n", err);
+ return;
+ }
+
+ /* set Analog Input through GPIO */
+ gpio_set_value(OLPC_GPIO_MIC_AC, on);
+}
+
+/*
+ * OLPC XO-1's V_REFOUT is a mic bias enable.
+ */
+void olpc_mic_bias(struct snd_ac97 *ac97, int on)
+{
+ int err;
+
+ if (!machine_is_olpc())
+ return;
+
+ 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)
+ dev_err(ac97->bus->card->dev, "setting MIC Bias - %d\n", err);
+}
+
+static int olpc_dc_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_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
+{
+ v->value.integer.value[0] = gpio_get_value(OLPC_GPIO_MIC_AC);
+ return 0;
+}
+
+static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
+{
+ struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
+
+ olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]);
+ return 1;
+}
+
+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[] = {
+{
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = "DC Mode Enable",
+ .info = olpc_dc_info,
+ .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 olpc_prequirks(struct snd_card *card,
+ struct snd_ac97_template *ac97)
+{
+ if (!machine_is_olpc())
+ return;
+
+ /* invert EAPD if on an OLPC B3 or higher */
+ if (olpc_board_at_least(olpc_board_pre(0xb3)))
+ ac97->scaps |= AC97_SCAP_INV_EAPD;
+}
+
+int 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;
+
+ if (gpio_request(OLPC_GPIO_MIC_AC, DRV_NAME)) {
+ dev_err(card->dev, "unable to allocate MIC GPIO\n");
+ return -EIO;
+ }
+ gpio_direction_output(OLPC_GPIO_MIC_AC, 0);
+
+ /* drop the original AD1888 HPF control */
+ memset(&elem, 0, sizeof(elem));
+ elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+ strlcpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));
+ snd_ctl_remove_id(card, &elem);
+
+ /* drop the original V_REFOUT control */
+ memset(&elem, 0, sizeof(elem));
+ elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+ strlcpy(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) {
+ gpio_free(OLPC_GPIO_MIC_AC);
+ return err;
+ }
+ }
+
+ /* turn off the mic by default */
+ olpc_mic_bias(ac97, 0);
+ return 0;
+}
+
+void olpc_quirks_cleanup(void)
+{
+ gpio_free(OLPC_GPIO_MIC_AC);
+}
Code Review / kvmfornfv.git / blobdiff