diff options
Diffstat (limited to 'sound/pci/cs5535audio/cs5535audio_olpc.c')
| -rw-r--r-- | sound/pci/cs5535audio/cs5535audio_olpc.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/sound/pci/cs5535audio/cs5535audio_olpc.c b/sound/pci/cs5535audio/cs5535audio_olpc.c new file mode 100644 index 000000000000..4b72d8662ec9 --- /dev/null +++ b/sound/pci/cs5535audio/cs5535audio_olpc.c @@ -0,0 +1,113 @@ +#include <linux/olpc.h> +#include <sound/driver.h> +#include <sound/core.h> +#include <sound/info.h> +#include <sound/control.h> +#include <sound/ac97_codec.h> +#include "cs5535audio.h" + +/* OLPC has an additional feature on top of regular AD1888 codec +features. This is support for an analog input mode. This is a +2 step process. First, to turn off the AD1888 codec bias voltage +and high pass filter. Second, to tell the embedded controller to +reroute from a capacitive trace to a direct trace using an analog +switch. The *_ec()s are what talk to that controller */ + +static int snd_cs5535audio_ctl_info(struct snd_kcontrol *kcontrol, + 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; +} + +#define AD1888_VREFOUT_EN_BIT (1 << 2) +#define AD1888_HPF_EN_BIT (1 << 12) +static int snd_cs5535audio_ctl_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol); + u16 reg1, reg2; + + /* if either AD1888 VRef Bias and High Pass Filter are enabled + or the EC is not in analog mode then flag as not in analog mode. + No EC command to read current analog state so we cache that. */ + reg1 = snd_ac97_read(cs5535au->ac97, AC97_AD_MISC); + reg2 = snd_ac97_read(cs5535au->ac97, AC97_AD_TEST2); + + if ((reg1 & AD1888_VREFOUT_EN_BIT) && (reg2 & AD1888_HPF_EN_BIT) && + cs5535au->ec_analog_input_mode) + ucontrol->value.integer.value[0] = 1; + else + ucontrol->value.integer.value[0] = 0; + + return 0; +} + +static int snd_cs5535audio_ctl_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + int err; + struct cs5535audio *cs5535au = snd_kcontrol_chip(kcontrol); + u8 value; + struct snd_ac97 *ac97 = cs5535au->ac97; + + /* value is 1 if analog input is desired */ + value = ucontrol->value.integer.value[0]; + + /* use ec mode as flag to determine if any change needed */ + if (cs5535au->ec_analog_input_mode == value) + return 0; + + /* sets High Z on VREF Bias if 1 */ + if (value) + err = snd_ac97_update_bits(ac97, AC97_AD_MISC, + AD1888_VREFOUT_EN_BIT, AD1888_VREFOUT_EN_BIT); + else + err = snd_ac97_update_bits(ac97, AC97_AD_MISC, + AD1888_VREFOUT_EN_BIT, 0); + if (err < 0) + snd_printk(KERN_ERR "Error updating AD_MISC %d\n", err); + + /* turns off High Pass Filter if 1 */ + if (value) + err = snd_ac97_update_bits(ac97, AC97_AD_TEST2, + AD1888_HPF_EN_BIT, AD1888_HPF_EN_BIT); + else + err = snd_ac97_update_bits(ac97, AC97_AD_TEST2, + AD1888_HPF_EN_BIT, 0); + if (err < 0) + snd_printk(KERN_ERR "Error updating AD_TEST2 %d\n", err); + + if (value) + err = write_ec_command(0x01); /* activate MIC_AC_OFF */ + else + err = write_ec_command(0x02); /* deactivates MIC_AC_OFF */ + + if (err < 0) + snd_printk(KERN_ERR "Error talking to EC %d\n", err); + + cs5535au->ec_analog_input_mode = value; + + return 1; +} + +static struct snd_kcontrol_new snd_cs5535audio_controls __devinitdata = +{ + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "Analog Input Switch", + .info = snd_cs5535audio_ctl_info, + .get = snd_cs5535audio_ctl_get, + .put = snd_cs5535audio_ctl_put, + .private_value = 0 +}; + +int __devinit olpc_quirks(struct snd_card *card, struct snd_ac97 *ac97) +{ + /* setup callback for mixer control that does analog input mode */ + return snd_ctl_add(card, snd_ctl_new1(&snd_cs5535audio_controls, + ac97->private_data)); +} + |