cs5535audio_olpc.c

  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}