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 snd_printk(KERN_ERR "setting High Pass Filter - %d\n", err); 40 return; 41 } 42 43 /* set Analog Input through GPIO */ 44 gpio_set_value(OLPC_GPIO_MIC_AC, on); 45} 46 47/* 48 * OLPC XO-1's V_REFOUT is a mic bias enable. 49 */ 50void olpc_mic_bias(struct snd_ac97 *ac97, int on) 51{ 52 int err; 53 54 if (!machine_is_olpc()) 55 return; 56 57 on = on ? 0 : 1; 58 err = snd_ac97_update_bits(ac97, AC97_AD_MISC, 59 1 << AC97_AD_VREFD_SHIFT, on << AC97_AD_VREFD_SHIFT); 60 if (err < 0) 61 snd_printk(KERN_ERR "setting MIC Bias - %d\n", err); 62} 63 64static int olpc_dc_info(struct snd_kcontrol *kctl, 65 struct snd_ctl_elem_info *uinfo) 66{ 67 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; 68 uinfo->count = 1; 69 uinfo->value.integer.min = 0; 70 uinfo->value.integer.max = 1; 71 return 0; 72} 73 74static int olpc_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v) 75{ 76 v->value.integer.value[0] = gpio_get_value(OLPC_GPIO_MIC_AC); 77 return 0; 78} 79 80static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v) 81{ 82 struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl); 83 84 olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]); 85 return 1; 86} 87 88static int olpc_mic_info(struct snd_kcontrol *kctl, 89 struct snd_ctl_elem_info *uinfo) 90{ 91 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; 92 uinfo->count = 1; 93 uinfo->value.integer.min = 0; 94 uinfo->value.integer.max = 1; 95 return 0; 96} 97 98static int olpc_mic_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v) 99{ 100 struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl); 101 struct snd_ac97 *ac97 = cs5535au->ac97; 102 int i; 103 104 i = (snd_ac97_read(ac97, AC97_AD_MISC) >> AC97_AD_VREFD_SHIFT) & 0x1; 105 v->value.integer.value[0] = i ? 0 : 1; 106 return 0; 107} 108 109static int olpc_mic_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v) 110{ 111 struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl); 112 113 olpc_mic_bias(cs5535au->ac97, v->value.integer.value[0]); 114 return 1; 115} 116 117static struct snd_kcontrol_new olpc_cs5535audio_ctls[] __devinitdata = { 118{ 119 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 120 .name = "DC Mode Enable", 121 .info = olpc_dc_info, 122 .get = olpc_dc_get, 123 .put = olpc_dc_put, 124 .private_value = 0, 125}, 126{ 127 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 128 .name = "MIC Bias Enable", 129 .info = olpc_mic_info, 130 .get = olpc_mic_get, 131 .put = olpc_mic_put, 132 .private_value = 0, 133}, 134}; 135 136void __devinit olpc_prequirks(struct snd_card *card, 137 struct snd_ac97_template *ac97) 138{ 139 if (!machine_is_olpc()) 140 return; 141 142 /* invert EAPD if on an OLPC B3 or higher */ 143 if (olpc_board_at_least(olpc_board_pre(0xb3))) 144 ac97->scaps |= AC97_SCAP_INV_EAPD; 145} 146 147int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97) 148{ 149 struct snd_ctl_elem_id elem; 150 int i, err; 151 152 if (!machine_is_olpc()) 153 return 0; 154 155 if (gpio_request(OLPC_GPIO_MIC_AC, DRV_NAME)) { 156 printk(KERN_ERR DRV_NAME ": unable to allocate MIC GPIO\n"); 157 return -EIO; 158 } 159 gpio_direction_output(OLPC_GPIO_MIC_AC, 0); 160 161 /* drop the original AD1888 HPF control */ 162 memset(&elem, 0, sizeof(elem)); 163 elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER; 164 strncpy(elem.name, "High Pass Filter Enable", sizeof(elem.name)); 165 snd_ctl_remove_id(card, &elem); 166 167 /* drop the original V_REFOUT control */ 168 memset(&elem, 0, sizeof(elem)); 169 elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER; 170 strncpy(elem.name, "V_REFOUT Enable", sizeof(elem.name)); 171 snd_ctl_remove_id(card, &elem); 172 173 /* add the OLPC-specific controls */ 174 for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) { 175 err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i], 176 ac97->private_data)); 177 if (err < 0) { 178 gpio_free(OLPC_GPIO_MIC_AC); 179 return err; 180 } 181 } 182 183 /* turn off the mic by default */ 184 olpc_mic_bias(ac97, 0); 185 return 0; 186} 187 188void __devexit olpc_quirks_cleanup(void) 189{ 190 gpio_free(OLPC_GPIO_MIC_AC); 191} 192