Commit | Line | Data |
---|---|---|
269c11fb AW |
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); | |
6ddd5453 | 96 | ret = v4l2_g_ctrl(itv->sd_audio->ctrl_handler, &vctrl); |
269c11fb AW |
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 */ | |
6ddd5453 | 118 | ret = v4l2_g_ctrl(itv->sd_audio->ctrl_handler, &vctrl); |
269c11fb AW |
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]); | |
6ddd5453 | 125 | ret = v4l2_s_ctrl(itv->sd_audio->ctrl_handler, &vctrl); |
269c11fb AW |
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 | } |