Andy Walls | 269c11f | 2012-09-02 19:13:14 -0300 | [diff] [blame] | 1 | /* |
| 2 | * ALSA mixer controls for the |
| 3 | * ALSA interface to ivtv PCM capture streams |
| 4 | * |
| 5 | * Copyright (C) 2009,2012 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 "ivtv-alsa.h" |
| 36 | #include "ivtv-driver.h" |
| 37 | |
| 38 | /* |
| 39 | * Note the cx25840-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 | */ |
| 54 | static inline int dB_to_cx25840_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 | |
| 63 | static inline int cx25840_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 | |
| 72 | static int snd_ivtv_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 | |
| 84 | static int snd_ivtv_mixer_tv_vol_get(struct snd_kcontrol *kctl, |
| 85 | struct snd_ctl_elem_value *uctl) |
| 86 | { |
| 87 | struct snd_ivtv_card *itvsc = snd_kcontrol_chip(kctl); |
| 88 | struct ivtv *itv = to_ivtv(itvsc->v4l2_dev); |
| 89 | struct v4l2_control vctrl; |
| 90 | int ret; |
| 91 | |
| 92 | vctrl.id = V4L2_CID_AUDIO_VOLUME; |
| 93 | vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]); |
| 94 | |
| 95 | snd_ivtv_lock(itvsc); |
| 96 | ret = v4l2_subdev_call(itv->sd_audio, core, g_ctrl, &vctrl); |
| 97 | snd_ivtv_unlock(itvsc); |
| 98 | |
| 99 | if (!ret) |
| 100 | uctl->value.integer.value[0] = cx25840_vol_to_dB(vctrl.value); |
| 101 | return ret; |
| 102 | } |
| 103 | |
| 104 | static int snd_ivtv_mixer_tv_vol_put(struct snd_kcontrol *kctl, |
| 105 | struct snd_ctl_elem_value *uctl) |
| 106 | { |
| 107 | struct snd_ivtv_card *itvsc = snd_kcontrol_chip(kctl); |
| 108 | struct ivtv *itv = to_ivtv(itvsc->v4l2_dev); |
| 109 | struct v4l2_control vctrl; |
| 110 | int ret; |
| 111 | |
| 112 | vctrl.id = V4L2_CID_AUDIO_VOLUME; |
| 113 | vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]); |
| 114 | |
| 115 | snd_ivtv_lock(itvsc); |
| 116 | |
| 117 | /* Fetch current state */ |
| 118 | ret = v4l2_subdev_call(itv->sd_audio, core, g_ctrl, &vctrl); |
| 119 | |
| 120 | if (ret || |
| 121 | (cx25840_vol_to_dB(vctrl.value) != uctl->value.integer.value[0])) { |
| 122 | |
| 123 | /* Set, if needed */ |
| 124 | vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]); |
| 125 | ret = v4l2_subdev_call(itv->sd_audio, core, s_ctrl, &vctrl); |
| 126 | if (!ret) |
| 127 | ret = 1; /* Indicate control was changed w/o error */ |
| 128 | } |
| 129 | snd_ivtv_unlock(itvsc); |
| 130 | |
| 131 | return ret; |
| 132 | } |
| 133 | |
| 134 | |
| 135 | /* This is a bit of overkill, the slider is already in dB internally */ |
| 136 | static DECLARE_TLV_DB_SCALE(snd_ivtv_mixer_tv_vol_db_scale, -9600, 100, 0); |
| 137 | |
| 138 | static struct snd_kcontrol_new snd_ivtv_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_ivtv_mixer_tv_volume_info, |
| 144 | .get = snd_ivtv_mixer_tv_volume_get, |
| 145 | .put = snd_ivtv_mixer_tv_volume_put, |
| 146 | .tlv.p = snd_ivtv_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 I2S volume */ |
| 160 | |
| 161 | int __init snd_ivtv_mixer_create(struct snd_ivtv_card *itvsc) |
| 162 | { |
| 163 | struct v4l2_device *v4l2_dev = itvsc->v4l2_dev; |
| 164 | struct snd_card *sc = itvsc->sc; |
| 165 | int ret; |
| 166 | |
| 167 | strlcpy(sc->mixername, "CX2341[56] Mixer", sizeof(sc->mixername)); |
| 168 | |
| 169 | ret = snd_ctl_add(sc, snd_ctl_new1(snd_ivtv_mixer_tv_vol, itvsc)); |
| 170 | if (ret) { |
| 171 | IVTV_ALSA_WARN("%s: failed to add %s control, err %d\n", |
| 172 | __func__, snd_ivtv_mixer_tv_vol.name, ret); |
| 173 | } |
| 174 | return ret; |
| 175 | } |