diff options
Diffstat (limited to 'drivers/media/video/em28xx/em28xx-audio.c')
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-audio.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c index a24e1770db48..a75c779640df 100644 --- a/drivers/media/video/em28xx/em28xx-audio.c +++ b/drivers/media/video/em28xx/em28xx-audio.c @@ -41,6 +41,7 @@ #include <sound/info.h> #include <sound/initval.h> #include <sound/control.h> +#include <sound/tlv.h> #include <media/v4l2-common.h> #include "em28xx.h" @@ -433,6 +434,92 @@ static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, return vmalloc_to_page(pageptr); } +/* + * AC97 volume control support + */ +static int em28xx_vol_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *info) +{ + info->type = SNDRV_CTL_ELEM_TYPE_INTEGER; + info->count = 2; + info->value.integer.min = 0; + info->value.integer.max = 0x1f; + + return 0; +} + +/* FIXME: should also add mute controls for each */ + +static int em28xx_vol_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *value) +{ + struct em28xx *dev = snd_kcontrol_chip(kcontrol); + u16 val = (value->value.integer.value[0] & 0x1f) | + (value->value.integer.value[1] & 0x1f) << 8; + int rc; + + mutex_lock(&dev->lock); + rc = em28xx_read_ac97(dev, kcontrol->private_value); + if (rc < 0) + goto err; + + val |= rc & 0x8080; /* Preserve the mute flags */ + + rc = em28xx_write_ac97(dev, kcontrol->private_value, val); + +err: + mutex_unlock(&dev->lock); + return rc; +} + +static int em28xx_vol_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *value) +{ + struct em28xx *dev = snd_kcontrol_chip(kcontrol); + int val; + + mutex_lock(&dev->lock); + val = em28xx_read_ac97(dev, kcontrol->private_value); + mutex_unlock(&dev->lock); + if (val < 0) + return val; + + value->value.integer.value[0] = val & 0x1f; + value->value.integer.value[1] = (val << 8) & 0x1f; + + return 0; +} + +static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0); + +static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev, + char *name, int id) +{ + int err; + struct snd_kcontrol *kctl; + struct snd_kcontrol_new tmp = { + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = name, + .info = em28xx_vol_info, + .get = em28xx_vol_get, + .put = em28xx_vol_put, + .private_value = id, + .tlv.p = em28xx_db_scale, + }; + + kctl = snd_ctl_new1(&tmp, dev); + + err = snd_ctl_add(card, kctl); + if (err < 0) + return err; + + return 0; +} + + +/* + * register/unregister code and data + */ static struct snd_pcm_ops snd_em28xx_pcm_capture = { .open = snd_em28xx_capture_open, .close = snd_em28xx_pcm_close, @@ -489,6 +576,22 @@ static int em28xx_audio_init(struct em28xx *dev) INIT_WORK(&dev->wq_trigger, audio_trigger); + if (dev->audio_mode.ac97 != EM28XX_NO_AC97) { + em28xx_cvol_new(card, dev, "Video", AC97_VIDEO_VOL); + em28xx_cvol_new(card, dev, "Line In", AC97_LINEIN_VOL); + em28xx_cvol_new(card, dev, "Phone", AC97_PHONE_VOL); + em28xx_cvol_new(card, dev, "Microphone", AC97_PHONE_VOL); + em28xx_cvol_new(card, dev, "CD", AC97_CD_VOL); + em28xx_cvol_new(card, dev, "AUX", AC97_AUX_VOL); + em28xx_cvol_new(card, dev, "PCM", AC97_PCM_OUT_VOL); + + em28xx_cvol_new(card, dev, "Master", AC97_MASTER_VOL); + em28xx_cvol_new(card, dev, "Line", AC97_LINE_LEVEL_VOL); + em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO_VOL); + em28xx_cvol_new(card, dev, "LFE", AC97_LFE_MASTER_VOL); + em28xx_cvol_new(card, dev, "Surround", AC97_SURR_MASTER_VOL); + } + err = snd_card_register(card); if (err < 0) { snd_card_free(card); |