sound/pci/cs5535audio/cs5535audio_olpc.c

   1 #include <sound/driver.h>
   2 #include <sound/core.h>
   3 #include <sound/info.h>
   4 #include <sound/control.h>
   5 #include <sound/ac97_codec.h>
   6
   7 #include <asm/olpc.h>
   8 #include "cs5535audio.h"
   9
  10 /*
  11  * OLPC has an additional feature on top of the regular AD1888 codec features.
  12  * It has an Analog Input mode that is switched into (after disabling the
  13  * High Pass Filter) via GPIO.  It is supported on B2 and later models.
  14  */
  15 void olpc_analog_input(struct snd_ac97 *ac97, int on)
  16 {
  17         int err;
  18
  19         /* update the High Pass Filter (via AC97_AD_TEST2) */
  20         err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
  21                         1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT);
  22         if (err < 0) {
  23                 snd_printk(KERN_ERR "setting High Pass Filter - %d\n", err);
  24                 return;
  25         }
  26
  27         /* set Analog Input through GPIO */
  28         if (on)
  29                 geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
  30         else
  31                 geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
  32 }
  33
  34 static int olpc_dc_info(struct snd_kcontrol *kctl,
  35                 struct snd_ctl_elem_info *uinfo)
  36 {
  37         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
  38         uinfo->count = 1;
  39         uinfo->value.integer.min = 0;
  40         uinfo->value.integer.max = 1;
  41         return 0;
  42 }
  43
  44 static int olpc_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
  45 {
  46         struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
  47         u8 val;
  48
  49         val = snd_ac97_read(cs5535au->ac97, AC97_AD_TEST2);
  50         val >>= AC97_AD_HPFD_SHIFT;
  51         v->value.integer.value[0] = val & 0x1;
  52
  53         return 0;
  54 }
  55
  56 static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
  57 {
  58         struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
  59
  60         olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]);
  61         return 1;
  62 }
  63
  64 static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata =
  65 {
  66         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  67         .name = "DC Mode Enable",
  68         .info = olpc_dc_info,
  69         .get = olpc_dc_get,
  70         .put = olpc_dc_put,
  71         .private_value = 0
  72 };
  73
  74 void __devinit olpc_prequirks(struct snd_card *card,
  75                 struct snd_ac97_template *ac97)
  76 {
  77         if (!machine_is_olpc())
  78                 return;
  79
  80         /* invert EAPD if on an OLPC B3 or higher */
  81         if (olpc_board_at_least(olpc_board_pre(0xb3)))
  82                 ac97->scaps |= AC97_SCAP_INV_EAPD;
  83 }
  84
  85 int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
  86 {
  87         struct snd_ctl_elem_id elem;
  88
  89         if (!machine_is_olpc())
  90                 return 0;
  91
  92         /* drop the original AD1888 HPF control */
  93         memset(&elem, 0, sizeof(elem));
  94         elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
  95         strncpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));
  96         snd_ctl_remove_id(card, &elem);
  97
  98         /* add the override for OLPC's HPF */
  99         return snd_ctl_add(card, snd_ctl_new1(&snd_cs5535audio_controls,
 100                                                 ac97->private_data));
 101 }
 102