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ALSA: cs5535audio: create function for setting OLPC's Analog Input mode 

Clean this stuff up a bit..

Signed-off-by: Andres Salomon <dilinger@debian.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Andres Salomon 2008-11-06 16:49:38 -05:00 committed by Takashi Iwai
parent 1e2232bc70
commit d6276b7802
2 changed files with 26 additions and 30 deletions
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2
sound/pci/cs5535audio/cs5535audio.h
View File

@ -103,6 +103,7 @@ int snd_cs5535audio_resume(struct pci_dev *pci);
void __devinit olpc_prequirks(struct snd_card *card,
struct snd_ac97_template *ac97);
int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97);
void olpc_analog_input(struct snd_ac97 *ac97, int on);
#else
static inline void olpc_prequirks(struct snd_card *card,
struct snd_ac97_template *ac97) { }
@ -110,6 +111,7 @@ static inline int olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
{
return 0;
}
static inline void olpc_analog_input(struct snd_ac97 *ac97, int on) { }
#endif
int __devinit snd_cs5535audio_pcm(struct cs5535audio *cs5535audio);

54
sound/pci/cs5535audio/cs5535audio_olpc.c
View File

@ -7,12 +7,29 @@
#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 */
/*
* OLPC has an additional feature on top of the regular AD1888 codec features.
* It has an Analog Input mode that is switched into (after disabling the
* High Pass Filter) via GPIO. It is supported on B2 and later models.
*/
void olpc_analog_input(struct snd_ac97 *ac97, int on)
{
int err;
/* update the High Pass Filter (via AC97_AD_TEST2) */
err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT);
if (err < 0) {
snd_printk(KERN_ERR "setting High Pass Filter - %d\n", err);
return;
}
/* set Analog Input through GPIO */
if (on)
geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
else
geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
}
static int snd_cs5535audio_ctl_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
@ -24,8 +41,6 @@ static int snd_cs5535audio_ctl_info(struct snd_kcontrol *kcontrol,
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)
{
@ -42,30 +57,9 @@ static int snd_cs5535audio_ctl_get(struct snd_kcontrol *kcontrol,
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);
olpc_analog_input(cs5535au->ac97, ucontrol->value.integer.value[0]);
return 1;
}