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269c11fbac
This is a cut-and-paste port of the cx18-alsa driver to create an ivtv-alsa interface module for the ivtv driver. It is not actually hooked-up to the PCM stream DMA buffers from the ivtv driver yet. That will be done in a coming change, since that portion is so very different from the cx18 driver. This code has all or more of the bugs and shortcomings of the cx18-alsa interface driver: inconsistent use of itvsc->slock, ivtv-alsa-mixer.c is dead code, assumes 48 ksps regardless of the actual setting of the audio capture, problems with proper struct ivtv and struct ivtv_stream housekeeping, struct ivtv_open_id.v4l2_fh abuse, and $DIETY knows what else. Signed-off-by: Andy Walls <awalls@md.metrocast.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
176 lines
4.8 KiB
C
176 lines
4.8 KiB
C
/*
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* ALSA mixer controls for the
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* ALSA interface to ivtv PCM capture streams
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*
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* Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/tlv.h>
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#include "ivtv-alsa.h"
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#include "ivtv-driver.h"
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/*
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* Note the cx25840-core volume scale is funny, due to the alignment of the
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* scale with another chip's range:
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*
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* v4l2_control value /512 indicated dB actual dB reg 0x8d4
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* 0x0000 - 0x01ff 0 -119 -96 228
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* 0x0200 - 0x02ff 1 -118 -96 228
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* ...
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* 0x2c00 - 0x2dff 22 -97 -96 228
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* 0x2e00 - 0x2fff 23 -96 -96 228
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* 0x3000 - 0x31ff 24 -95 -95 226
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* ...
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* 0xee00 - 0xefff 119 0 0 36
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* ...
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* 0xfe00 - 0xffff 127 +8 +8 20
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*/
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static inline int dB_to_cx25840_vol(int dB)
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{
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if (dB < -96)
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dB = -96;
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else if (dB > 8)
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dB = 8;
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return (dB + 119) << 9;
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}
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static inline int cx25840_vol_to_dB(int v)
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{
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if (v < (23 << 9))
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v = (23 << 9);
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else if (v > (127 << 9))
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v = (127 << 9);
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return (v >> 9) - 119;
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}
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static int snd_ivtv_mixer_tv_vol_info(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_info *uinfo)
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{
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uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
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uinfo->count = 1;
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/* We're already translating values, just keep this control in dB */
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uinfo->value.integer.min = -96;
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uinfo->value.integer.max = 8;
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uinfo->value.integer.step = 1;
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return 0;
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}
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static int snd_ivtv_mixer_tv_vol_get(struct snd_kcontrol *kctl,
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struct snd_ctl_elem_value *uctl)
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{
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struct snd_ivtv_card *itvsc = snd_kcontrol_chip(kctl);
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struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
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struct v4l2_control vctrl;
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int ret;
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vctrl.id = V4L2_CID_AUDIO_VOLUME;
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vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]);
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snd_ivtv_lock(itvsc);
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ret = v4l2_subdev_call(itv->sd_audio, core, g_ctrl, &vctrl);
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snd_ivtv_unlock(itvsc);
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if (!ret)
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uctl->value.integer.value[0] = cx25840_vol_to_dB(vctrl.value);
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return ret;
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}
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static int snd_ivtv_mixer_tv_vol_put(struct snd_kcontrol *kctl,
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struct snd_ctl_elem_value *uctl)
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{
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struct snd_ivtv_card *itvsc = snd_kcontrol_chip(kctl);
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struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
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struct v4l2_control vctrl;
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int ret;
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vctrl.id = V4L2_CID_AUDIO_VOLUME;
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vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]);
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snd_ivtv_lock(itvsc);
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/* Fetch current state */
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ret = v4l2_subdev_call(itv->sd_audio, core, g_ctrl, &vctrl);
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if (ret ||
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(cx25840_vol_to_dB(vctrl.value) != uctl->value.integer.value[0])) {
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/* Set, if needed */
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vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]);
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ret = v4l2_subdev_call(itv->sd_audio, core, s_ctrl, &vctrl);
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if (!ret)
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ret = 1; /* Indicate control was changed w/o error */
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}
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snd_ivtv_unlock(itvsc);
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return ret;
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}
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/* This is a bit of overkill, the slider is already in dB internally */
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static DECLARE_TLV_DB_SCALE(snd_ivtv_mixer_tv_vol_db_scale, -9600, 100, 0);
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static struct snd_kcontrol_new snd_ivtv_mixer_tv_vol __initdata = {
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.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
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.name = "Analog TV Capture Volume",
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.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
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SNDRV_CTL_ELEM_ACCESS_TLV_READ,
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.info = snd_ivtv_mixer_tv_volume_info,
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.get = snd_ivtv_mixer_tv_volume_get,
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.put = snd_ivtv_mixer_tv_volume_put,
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.tlv.p = snd_ivtv_mixer_tv_vol_db_scale
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};
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/* FIXME - add mute switch and balance, bass, treble sliders:
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V4L2_CID_AUDIO_MUTE
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V4L2_CID_AUDIO_BALANCE
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V4L2_CID_AUDIO_BASS
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V4L2_CID_AUDIO_TREBLE
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*/
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/* FIXME - add stereo, lang1, lang2, mono menu */
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/* FIXME - add I2S volume */
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int __init snd_ivtv_mixer_create(struct snd_ivtv_card *itvsc)
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{
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struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
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struct snd_card *sc = itvsc->sc;
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int ret;
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strlcpy(sc->mixername, "CX2341[56] Mixer", sizeof(sc->mixername));
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ret = snd_ctl_add(sc, snd_ctl_new1(snd_ivtv_mixer_tv_vol, itvsc));
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if (ret) {
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IVTV_ALSA_WARN("%s: failed to add %s control, err %d\n",
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__func__, snd_ivtv_mixer_tv_vol.name, ret);
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}
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return ret;
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}
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