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}
188