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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * OLPC XO-1 additional sound features4 *5 * Copyright © 2006 Jaya Kumar <jayakumar.lkml@gmail.com>6 * Copyright © 2007-2008 Andres Salomon <dilinger@debian.org>7 */8#include <sound/core.h>9#include <sound/info.h>10#include <sound/control.h>11#include <sound/ac97_codec.h>12#include <linux/gpio.h>13 14#include <asm/olpc.h>15#include "cs5535audio.h"16 17#define DRV_NAME "cs5535audio-olpc"18 19/*20 * OLPC has an additional feature on top of the regular AD1888 codec features.21 * It has an Analog Input mode that is switched into (after disabling the22 * High Pass Filter) via GPIO. It is supported on B2 and later models.23 */24void olpc_analog_input(struct snd_ac97 *ac97, int on)25{26 int err;27 28 if (!machine_is_olpc())29 return;30 31 /* update the High Pass Filter (via AC97_AD_TEST2) */32 err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,33 1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT);34 if (err < 0) {35 dev_err(ac97->bus->card->dev,36 "setting High Pass Filter - %d\n", err);37 return;38 }39 40 /* set Analog Input through GPIO */41 gpio_set_value(OLPC_GPIO_MIC_AC, on);42}43 44/*45 * OLPC XO-1's V_REFOUT is a mic bias enable.46 */47void olpc_mic_bias(struct snd_ac97 *ac97, int on)48{49 int err;50 51 if (!machine_is_olpc())52 return;53 54 on = on ? 0 : 1;55 err = snd_ac97_update_bits(ac97, AC97_AD_MISC,56 1 << AC97_AD_VREFD_SHIFT, on << AC97_AD_VREFD_SHIFT);57 if (err < 0)58 dev_err(ac97->bus->card->dev, "setting MIC Bias - %d\n", err);59}60 61static int olpc_dc_info(struct snd_kcontrol *kctl,62 struct snd_ctl_elem_info *uinfo)63{64 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;65 uinfo->count = 1;66 uinfo->value.integer.min = 0;67 uinfo->value.integer.max = 1;68 return 0;69}70 71static int olpc_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)72{73 v->value.integer.value[0] = gpio_get_value(OLPC_GPIO_MIC_AC);74 return 0;75}76 77static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)78{79 struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);80 81 olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]);82 return 1;83}84 85static int olpc_mic_info(struct snd_kcontrol *kctl,86 struct snd_ctl_elem_info *uinfo)87{88 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;89 uinfo->count = 1;90 uinfo->value.integer.min = 0;91 uinfo->value.integer.max = 1;92 return 0;93}94 95static int olpc_mic_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)96{97 struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);98 struct snd_ac97 *ac97 = cs5535au->ac97;99 int i;100 101 i = (snd_ac97_read(ac97, AC97_AD_MISC) >> AC97_AD_VREFD_SHIFT) & 0x1;102 v->value.integer.value[0] = i ? 0 : 1;103 return 0;104}105 106static int olpc_mic_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)107{108 struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);109 110 olpc_mic_bias(cs5535au->ac97, v->value.integer.value[0]);111 return 1;112}113 114static const struct snd_kcontrol_new olpc_cs5535audio_ctls[] = {115{116 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,117 .name = "DC Mode Enable",118 .info = olpc_dc_info,119 .get = olpc_dc_get,120 .put = olpc_dc_put,121 .private_value = 0,122},123{124 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,125 .name = "MIC Bias Enable",126 .info = olpc_mic_info,127 .get = olpc_mic_get,128 .put = olpc_mic_put,129 .private_value = 0,130},131};132 133void olpc_prequirks(struct snd_card *card,134 struct snd_ac97_template *ac97)135{136 if (!machine_is_olpc())137 return;138 139 /* invert EAPD if on an OLPC B3 or higher */140 if (olpc_board_at_least(olpc_board_pre(0xb3)))141 ac97->scaps |= AC97_SCAP_INV_EAPD;142}143 144int olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)145{146 struct snd_ctl_elem_id elem;147 int i, err;148 149 if (!machine_is_olpc())150 return 0;151 152 if (gpio_request(OLPC_GPIO_MIC_AC, DRV_NAME)) {153 dev_err(card->dev, "unable to allocate MIC GPIO\n");154 return -EIO;155 }156 gpio_direction_output(OLPC_GPIO_MIC_AC, 0);157 158 /* drop the original AD1888 HPF control */159 memset(&elem, 0, sizeof(elem));160 elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;161 strscpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));162 snd_ctl_remove_id(card, &elem);163 164 /* drop the original V_REFOUT control */165 memset(&elem, 0, sizeof(elem));166 elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;167 strscpy(elem.name, "V_REFOUT Enable", sizeof(elem.name));168 snd_ctl_remove_id(card, &elem);169 170 /* add the OLPC-specific controls */171 for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) {172 err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i],173 ac97->private_data));174 if (err < 0)175 return err;176 }177 178 /* turn off the mic by default */179 olpc_mic_bias(ac97, 0);180 return 0;181}182 183void olpc_quirks_cleanup(void)184{185 if (machine_is_olpc())186 gpio_free(OLPC_GPIO_MIC_AC);187}188