diff options
Diffstat (limited to 'drivers/media/pci/ivtv/ivtv-alsa-mixer.c')
| -rw-r--r-- | drivers/media/pci/ivtv/ivtv-alsa-mixer.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/media/pci/ivtv/ivtv-alsa-mixer.c b/drivers/media/pci/ivtv/ivtv-alsa-mixer.c new file mode 100644 index 000000000000..33ec05b09af3 --- /dev/null +++ b/drivers/media/pci/ivtv/ivtv-alsa-mixer.c @@ -0,0 +1,175 @@ +/* + * ALSA mixer controls for the + * ALSA interface to ivtv PCM capture streams + * + * Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + * 02111-1307 USA + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/spinlock.h> +#include <linux/videodev2.h> + +#include <media/v4l2-device.h> + +#include <sound/core.h> +#include <sound/control.h> +#include <sound/tlv.h> + +#include "ivtv-alsa.h" +#include "ivtv-driver.h" + +/* + * Note the cx25840-core volume scale is funny, due to the alignment of the + * scale with another chip's range: + * + * v4l2_control value /512 indicated dB actual dB reg 0x8d4 + * 0x0000 - 0x01ff 0 -119 -96 228 + * 0x0200 - 0x02ff 1 -118 -96 228 + * ... + * 0x2c00 - 0x2dff 22 -97 -96 228 + * 0x2e00 - 0x2fff 23 -96 -96 228 + * 0x3000 - 0x31ff 24 -95 -95 226 + * ... + * 0xee00 - 0xefff 119 0 0 36 + * ... + * 0xfe00 - 0xffff 127 +8 +8 20 + */ +static inline int dB_to_cx25840_vol(int dB) +{ + if (dB < -96) + dB = -96; + else if (dB > 8) + dB = 8; + return (dB + 119) << 9; +} + +static inline int cx25840_vol_to_dB(int v) +{ + if (v < (23 << 9)) + v = (23 << 9); + else if (v > (127 << 9)) + v = (127 << 9); + return (v >> 9) - 119; +} + +static int snd_ivtv_mixer_tv_vol_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; + uinfo->count = 1; + /* We're already translating values, just keep this control in dB */ + uinfo->value.integer.min = -96; + uinfo->value.integer.max = 8; + uinfo->value.integer.step = 1; + return 0; +} + +static int snd_ivtv_mixer_tv_vol_get(struct snd_kcontrol *kctl, + struct snd_ctl_elem_value *uctl) +{ + struct snd_ivtv_card *itvsc = snd_kcontrol_chip(kctl); + struct ivtv *itv = to_ivtv(itvsc->v4l2_dev); + struct v4l2_control vctrl; + int ret; + + vctrl.id = V4L2_CID_AUDIO_VOLUME; + vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]); + + snd_ivtv_lock(itvsc); + ret = v4l2_subdev_call(itv->sd_audio, core, g_ctrl, &vctrl); + snd_ivtv_unlock(itvsc); + + if (!ret) + uctl->value.integer.value[0] = cx25840_vol_to_dB(vctrl.value); + return ret; +} + +static int snd_ivtv_mixer_tv_vol_put(struct snd_kcontrol *kctl, + struct snd_ctl_elem_value *uctl) +{ + struct snd_ivtv_card *itvsc = snd_kcontrol_chip(kctl); + struct ivtv *itv = to_ivtv(itvsc->v4l2_dev); + struct v4l2_control vctrl; + int ret; + + vctrl.id = V4L2_CID_AUDIO_VOLUME; + vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]); + + snd_ivtv_lock(itvsc); + + /* Fetch current state */ + ret = v4l2_subdev_call(itv->sd_audio, core, g_ctrl, &vctrl); + + if (ret || + (cx25840_vol_to_dB(vctrl.value) != uctl->value.integer.value[0])) { + + /* Set, if needed */ + vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]); + ret = v4l2_subdev_call(itv->sd_audio, core, s_ctrl, &vctrl); + if (!ret) + ret = 1; /* Indicate control was changed w/o error */ + } + snd_ivtv_unlock(itvsc); + + return ret; +} + + +/* This is a bit of overkill, the slider is already in dB internally */ +static DECLARE_TLV_DB_SCALE(snd_ivtv_mixer_tv_vol_db_scale, -9600, 100, 0); + +static struct snd_kcontrol_new snd_ivtv_mixer_tv_vol __initdata = { + .iface = SNDRV_CTL_ELEM_IFACE_MIXER, + .name = "Analog TV Capture Volume", + .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | + SNDRV_CTL_ELEM_ACCESS_TLV_READ, + .info = snd_ivtv_mixer_tv_volume_info, + .get = snd_ivtv_mixer_tv_volume_get, + .put = snd_ivtv_mixer_tv_volume_put, + .tlv.p = snd_ivtv_mixer_tv_vol_db_scale +}; + +/* FIXME - add mute switch and balance, bass, treble sliders: + V4L2_CID_AUDIO_MUTE + + V4L2_CID_AUDIO_BALANCE + + V4L2_CID_AUDIO_BASS + V4L2_CID_AUDIO_TREBLE +*/ + +/* FIXME - add stereo, lang1, lang2, mono menu */ +/* FIXME - add I2S volume */ + +int __init snd_ivtv_mixer_create(struct snd_ivtv_card *itvsc) +{ + struct v4l2_device *v4l2_dev = itvsc->v4l2_dev; + struct snd_card *sc = itvsc->sc; + int ret; + + strlcpy(sc->mixername, "CX2341[56] Mixer", sizeof(sc->mixername)); + + ret = snd_ctl_add(sc, snd_ctl_new1(snd_ivtv_mixer_tv_vol, itvsc)); + if (ret) { + IVTV_ALSA_WARN("%s: failed to add %s control, err %d\n", + __func__, snd_ivtv_mixer_tv_vol.name, ret); + } + return ret; +} |