1/*
2 * OLPC XO-1 additional sound features
3 *
4 * Copyright �� 2006  Jaya Kumar <jayakumar.lkml@gmail.com>
5 * Copyright �� 2007-2008  Andres Salomon <dilinger@debian.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12#include <sound/core.h>
13#include <sound/info.h>
14#include <sound/control.h>
15#include <sound/ac97_codec.h>
16#include <linux/gpio.h>
17
18#include <asm/olpc.h>
19#include "cs5535audio.h"
20
21#define DRV_NAME "cs5535audio-olpc"
22
23/*
24 * OLPC has an additional feature on top of the regular AD1888 codec features.
25 * It has an Analog Input mode that is switched into (after disabling the
26 * High Pass Filter) via GPIO.  It is supported on B2 and later models.
27 */
28void olpc_analog_input(struct snd_ac97 *ac97, int on)
29{
30	int err;
31
32	if (!machine_is_olpc())
33		return;
34
35	/* update the High Pass Filter (via AC97_AD_TEST2) */
36	err = snd_ac97_update_bits(ac97, AC97_AD_TEST2,
37			1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT);
38	if (err < 0) {
39		dev_err(ac97->bus->card->dev,
40			"setting High Pass Filter - %d\n", err);
41		return;
42	}
43
44	/* set Analog Input through GPIO */
45	gpio_set_value(OLPC_GPIO_MIC_AC, on);
46}
47
48/*
49 * OLPC XO-1's V_REFOUT is a mic bias enable.
50 */
51void olpc_mic_bias(struct snd_ac97 *ac97, int on)
52{
53	int err;
54
55	if (!machine_is_olpc())
56		return;
57
58	on = on ? 0 : 1;
59	err = snd_ac97_update_bits(ac97, AC97_AD_MISC,
60			1 << AC97_AD_VREFD_SHIFT, on << AC97_AD_VREFD_SHIFT);
61	if (err < 0)
62		dev_err(ac97->bus->card->dev, "setting MIC Bias - %d\n", err);
63}
64
65static int olpc_dc_info(struct snd_kcontrol *kctl,
66		struct snd_ctl_elem_info *uinfo)
67{
68	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
69	uinfo->count = 1;
70	uinfo->value.integer.min = 0;
71	uinfo->value.integer.max = 1;
72	return 0;
73}
74
75static int olpc_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
76{
77	v->value.integer.value[0] = gpio_get_value(OLPC_GPIO_MIC_AC);
78	return 0;
79}
80
81static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
82{
83	struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
84
85	olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]);
86	return 1;
87}
88
89static int olpc_mic_info(struct snd_kcontrol *kctl,
90		struct snd_ctl_elem_info *uinfo)
91{
92	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
93	uinfo->count = 1;
94	uinfo->value.integer.min = 0;
95	uinfo->value.integer.max = 1;
96	return 0;
97}
98
99static int olpc_mic_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
100{
101	struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
102	struct snd_ac97 *ac97 = cs5535au->ac97;
103	int i;
104
105	i = (snd_ac97_read(ac97, AC97_AD_MISC) >> AC97_AD_VREFD_SHIFT) & 0x1;
106	v->value.integer.value[0] = i ? 0 : 1;
107	return 0;
108}
109
110static int olpc_mic_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v)
111{
112	struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl);
113
114	olpc_mic_bias(cs5535au->ac97, v->value.integer.value[0]);
115	return 1;
116}
117
118static struct snd_kcontrol_new olpc_cs5535audio_ctls[] = {
119{
120	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
121	.name = "DC Mode Enable",
122	.info = olpc_dc_info,
123	.get = olpc_dc_get,
124	.put = olpc_dc_put,
125	.private_value = 0,
126},
127{
128	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
129	.name = "MIC Bias Enable",
130	.info = olpc_mic_info,
131	.get = olpc_mic_get,
132	.put = olpc_mic_put,
133	.private_value = 0,
134},
135};
136
137void olpc_prequirks(struct snd_card *card,
138		    struct snd_ac97_template *ac97)
139{
140	if (!machine_is_olpc())
141		return;
142
143	/* invert EAPD if on an OLPC B3 or higher */
144	if (olpc_board_at_least(olpc_board_pre(0xb3)))
145		ac97->scaps |= AC97_SCAP_INV_EAPD;
146}
147
148int olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97)
149{
150	struct snd_ctl_elem_id elem;
151	int i, err;
152
153	if (!machine_is_olpc())
154		return 0;
155
156	if (gpio_request(OLPC_GPIO_MIC_AC, DRV_NAME)) {
157		dev_err(card->dev, "unable to allocate MIC GPIO\n");
158		return -EIO;
159	}
160	gpio_direction_output(OLPC_GPIO_MIC_AC, 0);
161
162	/* drop the original AD1888 HPF control */
163	memset(&elem, 0, sizeof(elem));
164	elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
165	strlcpy(elem.name, "High Pass Filter Enable", sizeof(elem.name));
166	snd_ctl_remove_id(card, &elem);
167
168	/* drop the original V_REFOUT control */
169	memset(&elem, 0, sizeof(elem));
170	elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
171	strlcpy(elem.name, "V_REFOUT Enable", sizeof(elem.name));
172	snd_ctl_remove_id(card, &elem);
173
174	/* add the OLPC-specific controls */
175	for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) {
176		err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i],
177				ac97->private_data));
178		if (err < 0) {
179			gpio_free(OLPC_GPIO_MIC_AC);
180			return err;
181		}
182	}
183
184	/* turn off the mic by default */
185	olpc_mic_bias(ac97, 0);
186	return 0;
187}
188
189void olpc_quirks_cleanup(void)
190{
191	gpio_free(OLPC_GPIO_MIC_AC);
192}
193