mirror of https://github.com/hak5/openwrt.git
111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
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#include <sound/driver.h>
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#include <sound/core.h>
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#include <sound/info.h>
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#include <sound/control.h>
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#include <sound/ac97_codec.h>
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#include <asm/olpc.h>
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#include "cs5535audio.h"
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/*
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* OLPC has an additional feature on top of the regular AD1888 codec features.
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* It has an Analog Input mode that is switched into (after disabling the
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* High Pass Filter) via GPIO. It is only supported on B2 and later models.
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*/
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int olpc_ai_enable(struct snd_ac97 *ac97, u8 val)
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{
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int err;
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/*
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* update the High Pass Filter (via AC97_AD_TEST2), and then set
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* Analog Input mode through a GPIO.
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*/
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if (val) {
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err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
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1<<AC97_AD_HPFD_SHIFT, 1<<AC97_AD_HPFD_SHIFT);
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geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
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}
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else {
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err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
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1<<AC97_AD_HPFD_SHIFT, 0);
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geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
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}
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if (err < 0)
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snd_printk(KERN_ERR "Error updating AD_TEST2: %d\n", err);
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return err;
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}
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EXPORT_SYMBOL_GPL(olpc_ai_enable);
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static int snd_cs5535audio_ai_info(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo)
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{
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uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
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uinfo->count = 1;
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uinfo->value.integer.min = 0;
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uinfo->value.integer.max = 1;
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return 0;
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}
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static int snd_cs5535audio_ai_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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ucontrol->value.integer.value[0] = geode_gpio_isset(OLPC_GPIO_MIC_AC,
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GPIO_OUTPUT_VAL);
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return 0;
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}
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static int snd_cs5535audio_ai_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol);
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struct snd_ac97 *ac97 = cs5535au->ac97;
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olpc_ai_enable(ac97, ucontrol->value.integer.value[0]);
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return 1;
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}
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static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata =
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{
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
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.name = "DC Mode Enable",
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.info = snd_cs5535audio_ai_info,
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.get = snd_cs5535audio_ai_get,
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.put = snd_cs5535audio_ai_put,
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.private_value = 0
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};
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void __devinit olpc_prequirks(struct snd_card *card,
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struct snd_ac97_template *ac97)
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{
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/* Bail if this isn't an OLPC platform */
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if (!machine_is_olpc())
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return;
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/* If on an OLPC B3 or higher, invert EAPD. */
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if (olpc_rev_after(OLPC_REV_B2))
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ac97->scaps |= AC97_SCAP_INV_EAPD;
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}
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int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
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{
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struct snd_ctl_elem_id elem;
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/* Bail if this isn't an OLPC platform */
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if (!machine_is_olpc())
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return 0;
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/* drop the original ad1888 HPF control */
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memset(&elem, 0, sizeof(elem));
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elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
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strcpy(elem.name, "High Pass Filter Enable");
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snd_ctl_remove_id(card, &elem);
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/* add the override for OLPC's HPF */
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return snd_ctl_add(card, snd_ctl_new1(&snd_cs5535audio_controls,
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ac97->private_data));
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}
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