1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
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;
}
|
