3556d18465
Fix an audible pop described in <http://dev.laptop.org/ticket/977>. Originally based upon fixes by Mitch Bradley and Chris Ball. Signed-off-by: Andres Salomon <dilinger@debian.org>
126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
#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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/* OLPC has an additional feature on top of regular AD1888 codec
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features. This is support for an analog input mode. This is a
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2 step process. First, to turn off the AD1888 codec bias voltage
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and high pass filter. Second, to tell the embedded controller to
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reroute from a capacitive trace to a direct trace using an analog
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switch. The *_ec()s are what talk to that controller */
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static int snd_cs5535audio_ctl_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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#define AD1888_VREFOUT_EN_BIT (1 << 2)
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#define AD1888_HPF_EN_BIT (1 << 12)
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static int snd_cs5535audio_ctl_get(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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u16 reg1, reg2;
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/* if either AD1888 VRef Bias and High Pass Filter are enabled
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or the EC is not in analog mode then flag as not in analog mode.
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No EC command to read current analog state so we cache that. */
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reg1 = snd_ac97_read(cs5535au->ac97, AC97_AD_MISC);
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reg2 = snd_ac97_read(cs5535au->ac97, AC97_AD_TEST2);
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if ((reg1 & AD1888_VREFOUT_EN_BIT) && (reg2 & AD1888_HPF_EN_BIT) &&
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cs5535au->ec_analog_input_mode)
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ucontrol->value.integer.value[0] = 1;
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else
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ucontrol->value.integer.value[0] = 0;
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return 0;
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}
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static int snd_cs5535audio_ctl_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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int err;
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struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol);
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u8 value;
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struct snd_ac97 *ac97 = cs5535au->ac97;
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/* value is 1 if analog input is desired */
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value = ucontrol->value.integer.value[0];
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/* use ec mode as flag to determine if any change needed */
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if (cs5535au->ec_analog_input_mode == value)
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return 0;
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/* sets High Z on VREF Bias if 1 */
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if (value)
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err = snd_ac97_update_bits(ac97, AC97_AD_MISC,
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AD1888_VREFOUT_EN_BIT, AD1888_VREFOUT_EN_BIT);
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else
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err = snd_ac97_update_bits(ac97, AC97_AD_MISC,
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AD1888_VREFOUT_EN_BIT, 0);
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if (err < 0)
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snd_printk(KERN_ERR "Error updating AD_MISC %d\n", err);
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/* turns off High Pass Filter if 1 */
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if (value)
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err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
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AD1888_HPF_EN_BIT, AD1888_HPF_EN_BIT);
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else
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err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
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AD1888_HPF_EN_BIT, 0);
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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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/* B2 and newer writes directly to a GPIO pin */
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if (value)
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geode_gpio_set(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
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else
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geode_gpio_clear(OLPC_GPIO_MIC_AC, GPIO_OUTPUT_VAL);
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cs5535au->ec_analog_input_mode = value;
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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 = "Analog Input Switch",
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.info = snd_cs5535audio_ctl_info,
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.get = snd_cs5535audio_ctl_get,
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.put = snd_cs5535audio_ctl_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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if (!machine_is_olpc())
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return;
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/* invert EAPD if on an OLPC B3 or higher */
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if (olpc_board_at_least(olpc_board_pre(0xb3)))
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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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if (!machine_is_olpc())
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return 0;
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/* setup callback for mixer control that does analog input mode */
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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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