diff options
Diffstat (limited to 'sound/pci/cs5535audio/cs5535audio_olpc.c')
| -rw-r--r-- | sound/pci/cs5535audio/cs5535audio_olpc.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/sound/pci/cs5535audio/cs5535audio_olpc.c b/sound/pci/cs5535audio/cs5535audio_olpc.c new file mode 100644 index 000000000..122170a41 --- /dev/null +++ b/sound/pci/cs5535audio/cs5535audio_olpc.c @@ -0,0 +1,187 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * OLPC XO-1 additional sound features + * + * Copyright © 2006 Jaya Kumar <jayakumar.lkml@gmail.com> + * Copyright © 2007-2008 Andres Salomon <dilinger@debian.org> + */ +#include <sound/core.h> +#include <sound/info.h> +#include <sound/control.h> +#include <sound/ac97_codec.h> +#include <linux/gpio.h> + +#include <asm/olpc.h> +#include "cs5535audio.h" + +#define DRV_NAME "cs5535audio-olpc" + +/* + * OLPC has an additional feature on top of the regular AD1888 codec features. + * It has an Analog Input mode that is switched into (after disabling the + * High Pass Filter) via GPIO. It is supported on B2 and later models. + */ +void olpc_analog_input(struct snd_ac97 *ac97, int on) +{ + int err; + + if (!machine_is_olpc()) + return; + + /* update the High Pass Filter (via AC97_AD_TEST2) */ + err = snd_ac97_update_bits(ac97, AC97_AD_TEST2, + 1 << AC97_AD_HPFD_SHIFT, on << AC97_AD_HPFD_SHIFT); + if (err < 0) { + dev_err(ac97->bus->card->dev, + "setting High Pass Filter - %d\n", err); + return; + } + + /* set Analog Input through GPIO */ + gpio_set_value(OLPC_GPIO_MIC_AC, on); +} + +/* + * OLPC XO-1's V_REFOUT is a mic bias enable. + */ +void olpc_mic_bias(struct snd_ac97 *ac97, int on) +{ + int err; + + if (!machine_is_olpc()) + return; + + on = on ? 0 : 1; + err = snd_ac97_update_bits(ac97, AC97_AD_MISC, + 1 << AC97_AD_VREFD_SHIFT, on << AC97_AD_VREFD_SHIFT); + if (err < 0) + dev_err(ac97->bus->card->dev, "setting MIC Bias - %d\n", err); +} + +static int olpc_dc_info(struct snd_kcontrol *kctl, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; + uinfo->count = 1; + uinfo->value.integer.min = 0; + uinfo->value.integer.max = 1; + return 0; +} + +static int olpc_dc_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v) +{ + v->value.integer.value[0] = gpio_get_value(OLPC_GPIO_MIC_AC); + return 0; +} + +static int olpc_dc_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v) +{ + struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl); + + olpc_analog_input(cs5535au->ac97, v->value.integer.value[0]); + return 1; +} + +static int olpc_mic_info(struct snd_kcontrol *kctl, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; + uinfo->count = 1; + uinfo->value.integer.min = 0; + uinfo->value.integer.max = 1; + return 0; +} + +static int olpc_mic_get(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v) +{ + struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl); + struct snd_ac97 *ac97 = cs5535au->ac97; + int i; + + i = (snd_ac97_read(ac97, AC97_AD_MISC) >> AC97_AD_VREFD_SHIFT) & 0x1; + v->value.integer.value[0] = i ? 0 : 1; + return 0; +} + +static int olpc_mic_put(struct snd_kcontrol *kctl, struct snd_ctl_elem_value *v) +{ + struct cs5535audio *cs5535au = snd_kcontrol_chip(kctl); + + olpc_mic_bias(cs5535au->ac97, v->value.integer.value[0]); + return 1; +} + +static const struct snd_kcontrol_new olpc_cs5535audio_ctls[] = { +{ + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "DC Mode Enable", + .info = olpc_dc_info, + .get = olpc_dc_get, + .put = olpc_dc_put, + .private_value = 0, +}, +{ + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "MIC Bias Enable", + .info = olpc_mic_info, + .get = olpc_mic_get, + .put = olpc_mic_put, + .private_value = 0, +}, +}; + +void olpc_prequirks(struct snd_card *card, + struct snd_ac97_template *ac97) +{ + if (!machine_is_olpc()) + return; + + /* invert EAPD if on an OLPC B3 or higher */ + if (olpc_board_at_least(olpc_board_pre(0xb3))) + ac97->scaps |= AC97_SCAP_INV_EAPD; +} + +int olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97) +{ + struct snd_ctl_elem_id elem; + int i, err; + + if (!machine_is_olpc()) + return 0; + + if (gpio_request(OLPC_GPIO_MIC_AC, DRV_NAME)) { + dev_err(card->dev, "unable to allocate MIC GPIO\n"); + return -EIO; + } + gpio_direction_output(OLPC_GPIO_MIC_AC, 0); + + /* drop the original AD1888 HPF control */ + memset(&elem, 0, sizeof(elem)); + elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER; + strscpy(elem.name, "High Pass Filter Enable", sizeof(elem.name)); + snd_ctl_remove_id(card, &elem); + + /* drop the original V_REFOUT control */ + memset(&elem, 0, sizeof(elem)); + elem.iface = SNDRV_CTL_ELEM_IFACE_MIXER; + strscpy(elem.name, "V_REFOUT Enable", sizeof(elem.name)); + snd_ctl_remove_id(card, &elem); + + /* add the OLPC-specific controls */ + for (i = 0; i < ARRAY_SIZE(olpc_cs5535audio_ctls); i++) { + err = snd_ctl_add(card, snd_ctl_new1(&olpc_cs5535audio_ctls[i], + ac97->private_data)); + if (err < 0) + return err; + } + + /* turn off the mic by default */ + olpc_mic_bias(ac97, 0); + return 0; +} + +void olpc_quirks_cleanup(void) +{ + if (machine_is_olpc()) + gpio_free(OLPC_GPIO_MIC_AC); +} |