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#include <sound/driver.h>
#include <sound/core.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/ac97_codec.h>
#include <asm/olpc.h>
#include "cs5535audio.h"
/* OLPC has an additional feature on top of regular AD1888 codec
features. This is support for an analog input mode. This is a
2 step process. First, to turn off the AD1888 codec bias voltage
and high pass filter. Second, to tell the embedded controller to
reroute from a capacitive trace to a direct trace using an analog
switch. The *_ec()s are what talk to that controller */
static int snd_cs5535audio_ctl_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = 1;
return 0;
}
#define AD1888_VREFOUT_EN_BIT (1 << 2)
#define AD1888_HPF_EN_BIT (1 << 12)
static int snd_cs5535audio_ctl_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol);
u8 val;
val = snd_ac97_read(cs5535au->ac97, AC97_AD_TEST2);
val >>= AC97_AD_HPFD_SHIFT;
ucontrol->value.integer.value[0] = val & 0x1;
return 0;
}
static int snd_cs5535audio_ctl_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
int err;
struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol);
u8 value;
struct snd_ac97 *ac97 = cs5535au->ac97;
/* value is 1 if analog input is desired */
value = ucontrol->value.integer.value[0];
/* turns off High Pass Filter if 1 */
if (value)
err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
AD1888_HPF_EN_BIT, AD1888_HPF_EN_BIT);
else
err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
AD1888_HPF_EN_BIT, 0);
if (err < 0)
snd_printk(KERN_ERR "Error updating AD_TEST2 %d\n", err);
/* B2 and newer writes directly to a GPIO pin */
if (value)
geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
else
geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
return 1;
}
static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata =
{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "Analog Input Switch",
.info = snd_cs5535audio_ctl_info,
.get = snd_cs5535audio_ctl_get,
.put = snd_cs5535audio_ctl_put,
.private_value = 0
};
void __devinit olpc_prequirks(struct snd_card *card,
struct snd_ac97_template *ac97)
{
if (!machine_is_olpc())
return;
/* invert EAPD if on an OLPC B3 or higher */
if (olpc_board_at_least(olpc_board_pre(0xb3)))
ac97->scaps |= AC97_SCAP_INV_EAPD;
}
int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
{
if (!machine_is_olpc())
return 0;
/* setup callback for mixer control that does analog input mode */
return snd_ctl_add(card, snd_ctl_new1(&snd_cs5535audio_controls,
ac97->private_data));
}
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