target/linux/olpc/files/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 only supported on B2 and later models.
  14  */
  15
  16 int olpc_ai_enable(struct snd_ac97 *ac97, u8 val)
  17 {
  18         int err;
  19
  20         /*
  21          * update the High Pass Filter (via AC97_AD_TEST2), and then set
  22          * Analog Input mode through a GPIO.
  23          */
  24
  25         if (val) {
  26                 err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
  27                                 1<<AC97_AD_HPFD_SHIFT, 1<<AC97_AD_HPFD_SHIFT);
  28                 geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
  29         }
  30         else {
  31                 err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
  32                                 1<<AC97_AD_HPFD_SHIFT, 0);
  33                 geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
  34         }
  35         if (err < 0)
  36                 snd_printk(KERN_ERR "Error updating AD_TEST2: %d\n", err);
  37
  38         return err;
  39 }
  40 EXPORT_SYMBOL_GPL(olpc_ai_enable);
  41
  42 static int snd_cs5535audio_ai_info(struct snd_kcontrol *kcontrol,
  43                 struct snd_ctl_elem_info *uinfo)
  44 {
  45         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
  46         uinfo->count = 1;
  47         uinfo->value.integer.min = 0;
  48         uinfo->value.integer.max = 1;
  49         return 0;
  50 }
  51
  52 static int snd_cs5535audio_ai_get(struct snd_kcontrol *kcontrol,
  53                 struct snd_ctl_elem_value *ucontrol)
  54 {
  55         ucontrol->value.integer.value[0] = geode_gpio_isset(OLPC_GPIO_MIC_AC,
  56                         GPIO_OUTPUT_VAL);
  57         return 0;
  58 }
  59
  60 static int snd_cs5535audio_ai_put(struct snd_kcontrol *kcontrol,
  61                 struct snd_ctl_elem_value *ucontrol)
  62 {
  63         struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol);
  64         struct snd_ac97 *ac97 = cs5535au->ac97;
  65
  66         olpc_ai_enable(ac97, ucontrol->value.integer.value[0]);
  67
  68         return 1;
  69 }
  70
  71 static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata =
  72 {
  73         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  74         .name = "DC Mode Enable",
  75         .info = snd_cs5535audio_ai_info,
  76         .get = snd_cs5535audio_ai_get,
  77         .put = snd_cs5535audio_ai_put,
  78         .private_value = 0
  79 };
  80
  81 void __devinit olpc_prequirks(struct snd_card *card,
  82                 struct snd_ac97_template *ac97)
  83 {
  84         /* Bail if this isn't an OLPC platform */
  85         if (!machine_is_olpc())
  86                 return;
  87
  88         /* If on an OLPC B3 or higher, invert EAPD. */
  89         if (olpc_rev_after(OLPC_REV_B2))
  90                 ac97->scaps |= AC97_SCAP_INV_EAPD;
  91 }
  92
  93 int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
  94 {
  95         struct snd_ctl_elem_id elem;
  96
  97         /* Bail if this isn't an OLPC platform */
  98         if (!machine_is_olpc())
  99                 return 0;
 100
 101         /* drop the original ad1888 HPF control */
 102         memset(&elem, 0, sizeof(elem));
 103         elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
 104         strcpy(elem.name, "High Pass Filter Enable");
 105         snd_ctl_remove_id(card, &elem);
 106
 107         /* add the override for OLPC's HPF */
 108         return snd_ctl_add(card, snd_ctl_new1(&snd_cs5535audio_controls,
 109                         ac97->private_data));
 110 }