release/src-rt-6.x.4708/linux/linux-2.6.36/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                 snd_printk(KERN_ERR "setting High Pass Filter - %d\n", err);
  40                 return;
  41         }
  42
  43         /* set Analog Input through GPIO */
  44         gpio_set_value(OLPC_GPIO_MIC_AC, on);
  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] = gpio_get_value(OLPC_GPIO_MIC_AC);
  77         return 0;
  78 }
  79
  80 static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
  81 {
  82         struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
  83
  84         olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]);
  85         return 1;
  86 }
  87
  88 static int olpc_mic_info(struct snd_kcontrol *kctl,
  89                 struct snd_ctl_elem_info *uinfo)
  90 {
  91         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
  92         uinfo->count = 1;
  93         uinfo->value.integer.min = 0;
  94         uinfo->value.integer.max = 1;
  95         return 0;
  96 }
  97
  98 static int olpc_mic_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
  99 {
 100         struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
 101         struct snd_ac97 *ac97 = cs5535au->ac97;
 102         int i;
 103
 104         i = (snd_ac97_read(ac97, AC97_AD_MISC) >> AC97_AD_VREFD_SHIFT) & 0x1;
 105         v->value.integer.value[0] = i ? 0 : 1;
 106         return 0;
 107 }
 108
 109 static int olpc_mic_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
 110 {
 111         struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
 112
 113         olpc_mic_bias(cs5535au->ac97, v->value.integer.value[0]);
 114         return 1;
 115 }
 116
 117 static struct snd_kcontrol_new olpc_cs5535audio_ctls[] __devinitdata = {
 118 {
 119         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 120         .name = "DC Mode Enable",
 121         .info = olpc_dc_info,
 122         .get = olpc_dc_get,
 123         .put = olpc_dc_put,
 124         .private_value = 0,
 125 },
 126 {
 127         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 128         .name = "MIC Bias Enable",
 129         .info = olpc_mic_info,
 130         .get = olpc_mic_get,
 131         .put = olpc_mic_put,
 132         .private_value = 0,
 133 },
 134 };
 135
 136 void __devinit olpc_prequirks(struct snd_card *card,
 137                 struct snd_ac97_template *ac97)
 138 {
 139         if (!machine_is_olpc())
 140                 return;
 141
 142         /* invert EAPD if on an OLPC B3 or higher */
 143         if (olpc_board_at_least(olpc_board_pre(0xb3)))
 144                 ac97->scaps |= AC97_SCAP_INV_EAPD;
 145 }
 146
 147 int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
 148 {
 149         struct snd_ctl_elem_id elem;
 150         int i, err;
 151
 152         if (!machine_is_olpc())
 153                 return 0;
 154
 155         if (gpio_request(OLPC_GPIO_MIC_AC, DRV_NAME)) {
 156                 printk(KERN_ERR DRV_NAME ": unable to allocate MIC GPIO\n");
 157                 return -EIO;
 158         }
 159         gpio_direction_output(OLPC_GPIO_MIC_AC, 0);
 160
 161         /* drop the original AD1888 HPF control */
 162         memset(&elem, 0, sizeof(elem));
 163         elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 164         strncpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));
 165         snd_ctl_remove_id(card, &elem);
 166
 167         /* drop the original V_REFOUT control */
 168         memset(&elem, 0, sizeof(elem));
 169         elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 170         strncpy(elem.name, "V_REFOUT Enable", sizeof(elem.name));
 171         snd_ctl_remove_id(card, &elem);
 172
 173         /* add the OLPC-specific controls */
 174         for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) {
 175                 err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i],
 176                                 ac97->private_data));
 177                 if (err < 0) {
 178                         gpio_free(OLPC_GPIO_MIC_AC);
 179                         return err;
 180                 }
 181         }
 182
 183         /* turn off the mic by default */
 184         olpc_mic_bias(ac97, 0);
 185         return 0;
 186 }
 187
 188 void __devexit olpc_quirks_cleanup(void)
 189 {
 190         gpio_free(OLPC_GPIO_MIC_AC);
 191 }