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 | */ |
24 | void 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 | mask: 1 << AC97_AD_HPFD_SHIFT, value: 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, value: on); |
42 | } |
43 | |
44 | /* |
45 | * OLPC XO-1's V_REFOUT is a mic bias enable. |
46 | */ |
47 | void 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 | mask: 1 << AC97_AD_VREFD_SHIFT, value: on << AC97_AD_VREFD_SHIFT); |
57 | if (err < 0) |
58 | dev_err(ac97->bus->card->dev, "setting MIC Bias - %d\n" , err); |
59 | } |
60 | |
61 | static 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 | |
71 | static 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 | |
77 | static 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 | |
85 | static 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 | |
95 | static 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 | |
106 | static 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 | |
114 | static 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 | |
133 | void 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 | |
144 | int 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, value: 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, id: &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, id: &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, kcontrol: snd_ctl_new1(kcontrolnew: &olpc_cs5535audio_ctls[i], |
173 | private_data: 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 | |
183 | void olpc_quirks_cleanup(void) |
184 | { |
185 | if (machine_is_olpc()) |
186 | gpio_free(OLPC_GPIO_MIC_AC); |
187 | } |
188 | |