2 * ALSA mixer controls for the
3 * ALSA interface to ivtv PCM capture streams
5 * Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net>
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.
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.
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
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>
29 #include <media/v4l2-device.h>
31 #include <sound/core.h>
32 #include <sound/control.h>
33 #include <sound/tlv.h>
35 #include "ivtv-alsa.h"
36 #include "ivtv-driver.h"
39 * Note the cx25840-core volume scale is funny, due to the alignment of the
40 * scale with another chip's range:
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
46 * 0x2c00 - 0x2dff 22 -97 -96 228
47 * 0x2e00 - 0x2fff 23 -96 -96 228
48 * 0x3000 - 0x31ff 24 -95 -95 226
50 * 0xee00 - 0xefff 119 0 0 36
52 * 0xfe00 - 0xffff 127 +8 +8 20
54 static inline int dB_to_cx25840_vol(int dB)
60 return (dB + 119) << 9;
63 static inline int cx25840_vol_to_dB(int v)
67 else if (v > (127 << 9))
69 return (v >> 9) - 119;
72 static int snd_ivtv_mixer_tv_vol_info(struct snd_kcontrol *kcontrol,
73 struct snd_ctl_elem_info *uinfo)
75 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
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;
84 static int snd_ivtv_mixer_tv_vol_get(struct snd_kcontrol *kctl,
85 struct snd_ctl_elem_value *uctl)
87 struct snd_ivtv_card *itvsc = snd_kcontrol_chip(kctl);
88 struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
89 struct v4l2_control vctrl;
92 vctrl.id = V4L2_CID_AUDIO_VOLUME;
93 vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]);
96 ret = v4l2_g_ctrl(itv->sd_audio->ctrl_handler, &vctrl);
97 snd_ivtv_unlock(itvsc);
100 uctl->value.integer.value[0] = cx25840_vol_to_dB(vctrl.value);
104 static int snd_ivtv_mixer_tv_vol_put(struct snd_kcontrol *kctl,
105 struct snd_ctl_elem_value *uctl)
107 struct snd_ivtv_card *itvsc = snd_kcontrol_chip(kctl);
108 struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
109 struct v4l2_control vctrl;
112 vctrl.id = V4L2_CID_AUDIO_VOLUME;
113 vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]);
115 snd_ivtv_lock(itvsc);
117 /* Fetch current state */
118 ret = v4l2_g_ctrl(itv->sd_audio->ctrl_handler, &vctrl);
121 (cx25840_vol_to_dB(vctrl.value) != uctl->value.integer.value[0])) {
124 vctrl.value = dB_to_cx25840_vol(uctl->value.integer.value[0]);
125 ret = v4l2_s_ctrl(itv->sd_audio->ctrl_handler, &vctrl);
127 ret = 1; /* Indicate control was changed w/o error */
129 snd_ivtv_unlock(itvsc);
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);
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
149 /* FIXME - add mute switch and balance, bass, treble sliders:
152 V4L2_CID_AUDIO_BALANCE
155 V4L2_CID_AUDIO_TREBLE
158 /* FIXME - add stereo, lang1, lang2, mono menu */
159 /* FIXME - add I2S volume */
161 int __init snd_ivtv_mixer_create(struct snd_ivtv_card *itvsc)
163 struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
164 struct snd_card *sc = itvsc->sc;
167 strlcpy(sc->mixername, "CX2341[56] Mixer", sizeof(sc->mixername));
169 ret = snd_ctl_add(sc, snd_ctl_new1(snd_ivtv_mixer_tv_vol, itvsc));
171 IVTV_ALSA_WARN("%s: failed to add %s control, err %d\n",
172 __func__, snd_ivtv_mixer_tv_vol.name, ret);