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 */ 28 void 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 */ 51 void 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 65 static 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 75 static 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 81 static 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 89 static 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 99 static 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 } 109 110 static 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 } 117 118 static 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 }; 136 137 void 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 } 147 148 int 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 } 188 189 void olpc_quirks_cleanup(void) 190 { 191 gpio_free(OLPC_GPIO_MIC_AC); 192 } 193