LXR linux/drivers/media/pci/cx18/cx18-alsa-mixer.c

   1/*
   2 *  ALSA mixer controls for the
   3 *  ALSA interface to cx18 PCM capture streams
   4 *
   5 *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.net>
   6 *
   7 *  This program is free software; you can redistribute it and/or modify
   8 *  it under the terms of the GNU General Public License as published by
   9 *  the Free Software Foundation; either version 2 of the License, or
  10 *  (at your option) any later version.
  11 *
  12 *  This program is distributed in the hope that it will be useful,
  13 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 *  GNU General Public License for more details.
  16 *
  17 *  You should have received a copy of the GNU General Public License
  18 *  along with this program; if not, write to the Free Software
  19 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20 *  02111-1307  USA
  21 */
  22
  23#include <linux/init.h>
  24#include <linux/kernel.h>
  25#include <linux/device.h>
  26#include <linux/spinlock.h>
  27#include <linux/videodev2.h>
  28
  29#include <media/v4l2-device.h>
  30
  31#include <sound/core.h>
  32#include <sound/control.h>
  33#include <sound/tlv.h>
  34
  35#include "cx18-alsa.h"
  36#include "cx18-driver.h"
  37
  38/*
  39 * Note the cx18-av-core volume scale is funny, due to the alignment of the
  40 * scale with another chip's range:
  41 *
  42 * v4l2_control value   /512    indicated dB    actual dB       reg 0x8d4
  43 * 0x0000 - 0x01ff        0     -119            -96             228
  44 * 0x0200 - 0x02ff        1     -118            -96             228
  45 * ...
  46 * 0x2c00 - 0x2dff       22      -97            -96             228
  47 * 0x2e00 - 0x2fff       23      -96            -96             228
  48 * 0x3000 - 0x31ff       24      -95            -95             226
  49 * ...
  50 * 0xee00 - 0xefff      119        0              0              36
  51 * ...
  52 * 0xfe00 - 0xffff      127       +8             +8              20
  53 */
  54static inline int dB_to_cx18_av_vol(int dB)
  55{
  56        if (dB < -96)
  57                dB = -96;
  58        else if (dB > 8)
  59                dB = 8;
  60        return (dB + 119) << 9;
  61}
  62
  63static inline int cx18_av_vol_to_dB(int v)
  64{
  65        if (v < (23 << 9))
  66                v = (23 << 9);
  67        else if (v > (127 << 9))
  68                v = (127 << 9);
  69        return (v >> 9) - 119;
  70}
  71
  72static int snd_cx18_mixer_tv_vol_info(struct snd_kcontrol *kcontrol,
  73                                      struct snd_ctl_elem_info *uinfo)
  74{
  75        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
  76        uinfo->count = 1;
  77        /* We're already translating values, just keep this control in dB */
  78        uinfo->value.integer.min  = -96;
  79        uinfo->value.integer.max  =   8;
  80        uinfo->value.integer.step =   1;
  81        return 0;
  82}
  83
  84static int snd_cx18_mixer_tv_vol_get(struct snd_kcontrol *kctl,
  85                                     struct snd_ctl_elem_value *uctl)
  86{
  87        struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl);
  88        struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
  89        struct v4l2_control vctrl;
  90        int ret;
  91
  92        vctrl.id = V4L2_CID_AUDIO_VOLUME;
  93        vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
  94
  95        snd_cx18_lock(cxsc);
  96        ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
  97        snd_cx18_unlock(cxsc);
  98
  99        if (!ret)
 100                uctl->value.integer.value[0] = cx18_av_vol_to_dB(vctrl.value);
 101        return ret;
 102}
 103
 104static int snd_cx18_mixer_tv_vol_put(struct snd_kcontrol *kctl,
 105                                     struct snd_ctl_elem_value *uctl)
 106{
 107        struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl);
 108        struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
 109        struct v4l2_control vctrl;
 110        int ret;
 111
 112        vctrl.id = V4L2_CID_AUDIO_VOLUME;
 113        vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
 114
 115        snd_cx18_lock(cxsc);
 116
 117        /* Fetch current state */
 118        ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
 119
 120        if (ret ||
 121            (cx18_av_vol_to_dB(vctrl.value) != uctl->value.integer.value[0])) {
 122
 123                /* Set, if needed */
 124                vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
 125                ret = v4l2_subdev_call(cx->sd_av, core, s_ctrl, &vctrl);
 126                if (!ret)
 127                        ret = 1; /* Indicate control was changed w/o error */
 128        }
 129        snd_cx18_unlock(cxsc);
 130
 131        return ret;
 132}
 133
 134
 135/* This is a bit of overkill, the slider is already in dB internally */
 136static DECLARE_TLV_DB_SCALE(snd_cx18_mixer_tv_vol_db_scale, -9600, 100, 0);
 137
 138static struct snd_kcontrol_new snd_cx18_mixer_tv_vol __initdata = {
 139        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 140        .name = "Analog TV Capture Volume",
 141        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
 142                  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
 143        .info = snd_cx18_mixer_tv_volume_info,
 144        .get = snd_cx18_mixer_tv_volume_get,
 145        .put = snd_cx18_mixer_tv_volume_put,
 146        .tlv.p = snd_cx18_mixer_tv_vol_db_scale
 147};
 148
 149/* FIXME - add mute switch and balance, bass, treble sliders:
 150        V4L2_CID_AUDIO_MUTE
 151
 152        V4L2_CID_AUDIO_BALANCE
 153
 154        V4L2_CID_AUDIO_BASS
 155        V4L2_CID_AUDIO_TREBLE
 156*/
 157
 158/* FIXME - add stereo, lang1, lang2, mono menu */
 159/* FIXME - add CS5345 I2S volume for HVR-1600 */
 160
 161int __init snd_cx18_mixer_create(struct snd_cx18_card *cxsc)
 162{
 163        struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
 164        struct snd_card *sc = cxsc->sc;
 165        int ret;
 166
 167        strlcpy(sc->mixername, "CX23418 Mixer", sizeof(sc->mixername));
 168
 169        ret = snd_ctl_add(sc, snd_ctl_new1(snd_cx18_mixer_tv_vol, cxsc));
 170        if (ret) {
 171                CX18_ALSA_WARN("%s: failed to add %s control, err %d\n",
 172                                __func__, snd_cx18_mixer_tv_vol.name, ret);
 173        }
 174        return ret;
 175}
 176