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
  17 #include <asm/olpc.h>
  18 #include "cs5535audio.h"
  19
  20 /*
  21  * OLPC has an additional feature on top of the regular AD1888 codec features.
  22  * It has an Analog Input mode that is switched into (after disabling the
  23  * High Pass Filter) via GPIO.  It is supported on B2 and later models.
  24  */
  25 void olpc_analog_input(struct snd_ac97 *ac97, int on)
  26 {
  27         int err;
  28
  29         if (!machine_is_olpc())
  30                 return;
  31
  32         /* update the High Pass Filter (via AC97_AD_TEST2) */
  33         err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
  34                         1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT);
  35         if (err < 0) {
  36                 snd_printk(KERN_ERR "setting High Pass Filter - %d\n", err);
  37                 return;
  38         }
  39
  40         /* set Analog Input through GPIO */
  41         if (on)
  42                 geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
  43         else
  44                 geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
  45 }
  46
  47 /*
  48  * OLPC XO-1's V_REFOUT is a mic bias enable.
  49  */
  50 void olpc_mic_bias(struct snd_ac97 *ac97, int on)
  51 {
  52         int err;
  53
  54         if (!machine_is_olpc())
  55                 return;
  56
  57         on = on ? 0 : 1;
  58         err = snd_ac97_update_bits(ac97, AC97_AD_MISC,
  59                         1 << AC97_AD_VREFD_SHIFT, on << AC97_AD_VREFD_SHIFT);
  60         if (err < 0)
  61                 snd_printk(KERN_ERR "setting MIC Bias - %d\n", err);
  62 }
  63
  64 static int olpc_dc_info(struct snd_kcontrol *kctl,
  65                 struct snd_ctl_elem_info *uinfo)
  66 {
  67         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
  68         uinfo->count = 1;
  69         uinfo->value.integer.min = 0;
  70         uinfo->value.integer.max = 1;
  71         return 0;
  72 }
  73
  74 static int olpc_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
  75 {
  76         v->value.integer.value[0] = geode_gpio_isset(OLPC_GPIO_MIC_AC,
  77                         GPIO_OUTPUT_VAL);
  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[] __devinitdata = {
 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 __devinit 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 __devinit 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         /* drop the original AD1888 HPF control */
 157         memset(&elem, 0, sizeof(elem));
 158         elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 159         strncpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));
 160         snd_ctl_remove_id(card, &elem);
 161
 162         /* drop the original V_REFOUT control */
 163         memset(&elem, 0, sizeof(elem));
 164         elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 165         strncpy(elem.name, "V_REFOUT Enable", sizeof(elem.name));
 166         snd_ctl_remove_id(card, &elem);
 167
 168         /* add the OLPC-specific controls */
 169         for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) {
 170                 err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i],
 171                                 ac97->private_data));
 172                 if (err < 0)
 173                         return err;
 174         }
 175
 176         /* turn off the mic by default */
 177         olpc_mic_bias(ac97, 0);
 178         return 0;
 179 }