2 * ALSA mixer controls for the
3 * ALSA interface to cx18 PCM capture streams
5 * Copyright (C) 2009 Andy Walls <awalls@radix.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 "cx18-alsa.h"
36 #include "cx18-driver.h"
39 * Note the cx18-av-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_cx18_av_vol(int dB
)
60 return (dB
+ 119) << 9;
63 static inline int cx18_av_vol_to_dB(int v
)
67 else if (v
> (127 << 9))
69 return (v
>> 9) - 119;
72 static int snd_cx18_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_cx18_mixer_tv_vol_get(struct snd_kcontrol
*kctl
,
85 struct snd_ctl_elem_value
*uctl
)
87 struct snd_cx18_card
*cxsc
= snd_kcontrol_chip(kctl
);
88 struct cx18
*cx
= to_cx18(cxsc
->v4l2_dev
);
89 struct v4l2_control vctrl
;
92 vctrl
.id
= V4L2_CID_AUDIO_VOLUME
;
93 vctrl
.value
= dB_to_cx18_av_vol(uctl
->value
.integer
.value
[0]);
96 ret
= v4l2_subdev_call(cx
->sd_av
, core
, g_ctrl
, &vctrl
);
97 snd_cx18_unlock(cxsc
);
100 uctl
->value
.integer
.value
[0] = cx18_av_vol_to_dB(vctrl
.value
);
104 static int snd_cx18_mixer_tv_vol_put(struct snd_kcontrol
*kctl
,
105 struct snd_ctl_elem_value
*uctl
)
107 struct snd_cx18_card
*cxsc
= snd_kcontrol_chip(kctl
);
108 struct cx18
*cx
= to_cx18(cxsc
->v4l2_dev
);
109 struct v4l2_control vctrl
;
112 vctrl
.id
= V4L2_CID_AUDIO_VOLUME
;
113 vctrl
.value
= dB_to_cx18_av_vol(uctl
->value
.integer
.value
[0]);
117 /* Fetch current state */
118 ret
= v4l2_subdev_call(cx
->sd_av
, core
, g_ctrl
, &vctrl
);
121 (cx18_av_vol_to_dB(vctrl
.value
) != uctl
->value
.integer
.value
[0])) {
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
);
127 ret
= 1; /* Indicate control was changed w/o error */
129 snd_cx18_unlock(cxsc
);
135 /* This is a bit of overkill, the slider is already in dB internally */
136 static DECLARE_TLV_DB_SCALE(snd_cx18_mixer_tv_vol_db_scale
, -9600, 100, 0);
138 static 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
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 CS5345 I2S volume for HVR-1600 */
161 int __init
snd_cx18_mixer_create(struct snd_cx18_card
*cxsc
)
163 struct v4l2_device
*v4l2_dev
= cxsc
->v4l2_dev
;
164 struct snd_card
*sc
= cxsc
->sc
;
167 strlcpy(sc
->mixername
, "CX23418 Mixer", sizeof(sc
->mixername
));
169 ret
= snd_ctl_add(sc
, snd_ctl_new1(snd_cx18_mixer_tv_vol
, cxsc
));
171 CX18_ALSA_WARN("%s: failed to add %s control, err %d\n",
172 __func__
, snd_cx18_mixer_tv_vol
.name
, ret
);