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 */
dB_to_cx18_av_vol(int dB)54 static 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
cx18_av_vol_to_dB(int v)63 static 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
snd_cx18_mixer_tv_vol_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)72 static 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
snd_cx18_mixer_tv_vol_get(struct snd_kcontrol * kctl,struct snd_ctl_elem_value * uctl)84 static 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
snd_cx18_mixer_tv_vol_put(struct snd_kcontrol * kctl,struct snd_ctl_elem_value * uctl)104 static 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 */
136 static DECLARE_TLV_DB_SCALE(snd_cx18_mixer_tv_vol_db_scale, -9600, 100, 0);
137
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
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
snd_cx18_mixer_create(struct snd_cx18_card * cxsc)161 int __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