sound/pci/cs5535audio/cs5535audio_olpc.c

   1 /*
   2  * OLPC XO-1 additional sound features
   3  *
   4  * Copyright © 2006  Jaya Kumar <jayakumar.lkml@gmail.com>
   5  * Copyright © 2007-2008  Andres Salomon <dilinger@debian.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12 #include <sound/core.h>
  13 #include <sound/info.h>
  14 #include <sound/control.h>
  15 #include <sound/ac97_codec.h>
  16 #include <linux/gpio.h>
  17
  18 #include <asm/olpc.h>
  19 #include "cs5535audio.h"
  20
  21 #define DRV_NAME "cs5535audio-olpc"
  22
  23 /*
  24  * OLPC has an additional feature on top of the regular AD1888 codec features.
  25  * It has an Analog Input mode that is switched into (after disabling the
  26  * High Pass Filter) via GPIO.  It is supported on B2 and later models.
  27  */
  28 void olpc_analog_input(struct snd_ac97 *ac97, int on)
  29 {
  30         int err;
  31
  32         if (!machine_is_olpc())
  33                 return;
  34
  35         /* update the High Pass Filter (via AC97_AD_TEST2) */
  36         err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
  37                         1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT);
  38         if (err < 0) {
  39                 dev_err(ac97->bus->card->dev,
  40                         "setting High Pass Filter - %d\n", err);
  41                 return;
  42         }
  43
  44         /* set Analog Input through GPIO */
  45         gpio_set_value(OLPC_GPIO_MIC_AC, on);
  46 }
  47
  48 /*
  49  * OLPC XO-1's V_REFOUT is a mic bias enable.
  50  */
  51 void olpc_mic_bias(struct snd_ac97 *ac97, int on)
  52 {
  53         int err;
  54
  55         if (!machine_is_olpc())
  56                 return;
  57
  58         on = on ? 0 : 1;
  59         err = snd_ac97_update_bits(ac97, AC97_AD_MISC,
  60                         1 << AC97_AD_VREFD_SHIFT, on << AC97_AD_VREFD_SHIFT);
  61         if (err < 0)
  62                 dev_err(ac97->bus->card->dev, "setting MIC Bias - %d\n", err);
  63 }
  64
  65 static int olpc_dc_info(struct snd_kcontrol *kctl,
  66                 struct snd_ctl_elem_info *uinfo)
  67 {
  68         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
  69         uinfo->count = 1;
  70         uinfo->value.integer.min = 0;
  71         uinfo->value.integer.max = 1;
  72         return 0;
  73 }
  74
  75 static int olpc_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
  76 {
  77         v->value.integer.value[0] = gpio_get_value(OLPC_GPIO_MIC_AC);
  78         return 0;
  79 }
  80
  81 static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
  82 {
  83         struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
  84
  85         olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]);
  86         return 1;
  87 }
  88
  89 static int olpc_mic_info(struct snd_kcontrol *kctl,
  90                 struct snd_ctl_elem_info *uinfo)
  91 {
  92         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
  93         uinfo->count = 1;
  94         uinfo->value.integer.min = 0;
  95         uinfo->value.integer.max = 1;
  96         return 0;
  97 }
  98
  99 static int olpc_mic_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
 100 {
 101         struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
 102         struct snd_ac97 *ac97 = cs5535au->ac97;
 103         int i;
 104
 105         i = (snd_ac97_read(ac97, AC97_AD_MISC) >> AC97_AD_VREFD_SHIFT) & 0x1;
 106         v->value.integer.value[0] = i ? 0 : 1;
 107         return 0;
 108 }
 109
 110 static int olpc_mic_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
 111 {
 112         struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
 113
 114         olpc_mic_bias(cs5535au->ac97, v->value.integer.value[0]);
 115         return 1;
 116 }
 117
 118 static struct snd_kcontrol_new olpc_cs5535audio_ctls[] = {
 119 {
 120         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 121         .name = "DC Mode Enable",
 122         .info = olpc_dc_info,
 123         .get = olpc_dc_get,
 124         .put = olpc_dc_put,
 125         .private_value = 0,
 126 },
 127 {
 128         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 129         .name = "MIC Bias Enable",
 130         .info = olpc_mic_info,
 131         .get = olpc_mic_get,
 132         .put = olpc_mic_put,
 133         .private_value = 0,
 134 },
 135 };
 136
 137 void olpc_prequirks(struct snd_card *card,
 138                     struct snd_ac97_template *ac97)
 139 {
 140         if (!machine_is_olpc())
 141                 return;
 142
 143         /* invert EAPD if on an OLPC B3 or higher */
 144         if (olpc_board_at_least(olpc_board_pre(0xb3)))
 145                 ac97->scaps |= AC97_SCAP_INV_EAPD;
 146 }
 147
 148 int olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
 149 {
 150         struct snd_ctl_elem_id elem;
 151         int i, err;
 152
 153         if (!machine_is_olpc())
 154                 return 0;
 155
 156         if (gpio_request(OLPC_GPIO_MIC_AC, DRV_NAME)) {
 157                 dev_err(card->dev, "unable to allocate MIC GPIO\n");
 158                 return -EIO;
 159         }
 160         gpio_direction_output(OLPC_GPIO_MIC_AC, 0);
 161
 162         /* drop the original AD1888 HPF control */
 163         memset(&elem, 0, sizeof(elem));
 164         elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 165         strlcpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));
 166         snd_ctl_remove_id(card, &elem);
 167
 168         /* drop the original V_REFOUT control */
 169         memset(&elem, 0, sizeof(elem));
 170         elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 171         strlcpy(elem.name, "V_REFOUT Enable", sizeof(elem.name));
 172         snd_ctl_remove_id(card, &elem);
 173
 174         /* add the OLPC-specific controls */
 175         for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) {
 176                 err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i],
 177                                 ac97->private_data));
 178                 if (err < 0) {
 179                         gpio_free(OLPC_GPIO_MIC_AC);
 180                         return err;
 181                 }
 182         }
 183
 184         /* turn off the mic by default */
 185         olpc_mic_bias(ac97, 0);
 186         return 0;
 187 }
 188
 189 void olpc_quirks_cleanup(void)
 190 {
 191         gpio_free(OLPC_GPIO_MIC_AC);
 192 }