cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cs5535audio_olpc.c (4598B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * OLPC XO-1 additional sound features
      4 *
      5 * Copyright © 2006  Jaya Kumar <jayakumar.lkml@gmail.com>
      6 * Copyright © 2007-2008  Andres Salomon <dilinger@debian.org>
      7 */
      8#include <sound/core.h>
      9#include <sound/info.h>
     10#include <sound/control.h>
     11#include <sound/ac97_codec.h>
     12#include <linux/gpio.h>
     13
     14#include <asm/olpc.h>
     15#include "cs5535audio.h"
     16
     17#define DRV_NAME "cs5535audio-olpc"
     18
     19/*
     20 * OLPC has an additional feature on top of the regular AD1888 codec features.
     21 * It has an Analog Input mode that is switched into (after disabling the
     22 * High Pass Filter) via GPIO.  It is supported on B2 and later models.
     23 */
     24void olpc_analog_input(struct snd_ac97 *ac97, int on)
     25{
     26	int err;
     27
     28	if (!machine_is_olpc())
     29		return;
     30
     31	/* update the High Pass Filter (via AC97_AD_TEST2) */
     32	err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
     33			1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT);
     34	if (err < 0) {
     35		dev_err(ac97->bus->card->dev,
     36			"setting High Pass Filter - %d\n", err);
     37		return;
     38	}
     39
     40	/* set Analog Input through GPIO */
     41	gpio_set_value(OLPC_GPIO_MIC_AC, on);
     42}
     43
     44/*
     45 * OLPC XO-1's V_REFOUT is a mic bias enable.
     46 */
     47void olpc_mic_bias(struct snd_ac97 *ac97, int on)
     48{
     49	int err;
     50
     51	if (!machine_is_olpc())
     52		return;
     53
     54	on = on ? 0 : 1;
     55	err = snd_ac97_update_bits(ac97, AC97_AD_MISC,
     56			1 << AC97_AD_VREFD_SHIFT, on << AC97_AD_VREFD_SHIFT);
     57	if (err < 0)
     58		dev_err(ac97->bus->card->dev, "setting MIC Bias - %d\n", err);
     59}
     60
     61static int olpc_dc_info(struct snd_kcontrol *kctl,
     62		struct snd_ctl_elem_info *uinfo)
     63{
     64	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
     65	uinfo->count = 1;
     66	uinfo->value.integer.min = 0;
     67	uinfo->value.integer.max = 1;
     68	return 0;
     69}
     70
     71static int olpc_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
     72{
     73	v->value.integer.value[0] = gpio_get_value(OLPC_GPIO_MIC_AC);
     74	return 0;
     75}
     76
     77static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
     78{
     79	struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
     80
     81	olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]);
     82	return 1;
     83}
     84
     85static int olpc_mic_info(struct snd_kcontrol *kctl,
     86		struct snd_ctl_elem_info *uinfo)
     87{
     88	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
     89	uinfo->count = 1;
     90	uinfo->value.integer.min = 0;
     91	uinfo->value.integer.max = 1;
     92	return 0;
     93}
     94
     95static int olpc_mic_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
     96{
     97	struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
     98	struct snd_ac97 *ac97 = cs5535au->ac97;
     99	int i;
    100
    101	i = (snd_ac97_read(ac97, AC97_AD_MISC) >> AC97_AD_VREFD_SHIFT) & 0x1;
    102	v->value.integer.value[0] = i ? 0 : 1;
    103	return 0;
    104}
    105
    106static int olpc_mic_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
    107{
    108	struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
    109
    110	olpc_mic_bias(cs5535au->ac97, v->value.integer.value[0]);
    111	return 1;
    112}
    113
    114static const struct snd_kcontrol_new olpc_cs5535audio_ctls[] = {
    115{
    116	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
    117	.name = "DC Mode Enable",
    118	.info = olpc_dc_info,
    119	.get = olpc_dc_get,
    120	.put = olpc_dc_put,
    121	.private_value = 0,
    122},
    123{
    124	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
    125	.name = "MIC Bias Enable",
    126	.info = olpc_mic_info,
    127	.get = olpc_mic_get,
    128	.put = olpc_mic_put,
    129	.private_value = 0,
    130},
    131};
    132
    133void olpc_prequirks(struct snd_card *card,
    134		    struct snd_ac97_template *ac97)
    135{
    136	if (!machine_is_olpc())
    137		return;
    138
    139	/* invert EAPD if on an OLPC B3 or higher */
    140	if (olpc_board_at_least(olpc_board_pre(0xb3)))
    141		ac97->scaps |= AC97_SCAP_INV_EAPD;
    142}
    143
    144int olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
    145{
    146	struct snd_ctl_elem_id elem;
    147	int i, err;
    148
    149	if (!machine_is_olpc())
    150		return 0;
    151
    152	if (gpio_request(OLPC_GPIO_MIC_AC, DRV_NAME)) {
    153		dev_err(card->dev, "unable to allocate MIC GPIO\n");
    154		return -EIO;
    155	}
    156	gpio_direction_output(OLPC_GPIO_MIC_AC, 0);
    157
    158	/* drop the original AD1888 HPF control */
    159	memset(&elem, 0, sizeof(elem));
    160	elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
    161	strscpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));
    162	snd_ctl_remove_id(card, &elem);
    163
    164	/* drop the original V_REFOUT control */
    165	memset(&elem, 0, sizeof(elem));
    166	elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
    167	strscpy(elem.name, "V_REFOUT Enable", sizeof(elem.name));
    168	snd_ctl_remove_id(card, &elem);
    169
    170	/* add the OLPC-specific controls */
    171	for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) {
    172		err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i],
    173				ac97->private_data));
    174		if (err < 0)
    175			return err;
    176	}
    177
    178	/* turn off the mic by default */
    179	olpc_mic_bias(ac97, 0);
    180	return 0;
    181}
    182
    183void olpc_quirks_cleanup(void)
    184{
    185	if (machine_is_olpc())
    186		gpio_free(OLPC_GPIO_MIC_AC);
    187}