| /* |
| * ALSA mixer controls for the |
| * ALSA interface to cx18 PCM capture streams |
| * |
| * Copyright (C) 2009 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 "cx18-alsa.h" |
| #include "cx18-driver.h" |
| |
| /* |
| * Note the cx18-av-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_cx18_av_vol(int dB) |
| { |
| if (dB < -96) |
| dB = -96; |
| else if (dB > 8) |
| dB = 8; |
| return (dB + 119) << 9; |
| } |
| |
| static inline int cx18_av_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_cx18_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_cx18_mixer_tv_vol_get(struct snd_kcontrol *kctl, |
| struct snd_ctl_elem_value *uctl) |
| { |
| struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl); |
| struct cx18 *cx = to_cx18(cxsc->v4l2_dev); |
| struct v4l2_control vctrl; |
| int ret; |
| |
| vctrl.id = V4L2_CID_AUDIO_VOLUME; |
| vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]); |
| |
| snd_cx18_lock(cxsc); |
| ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl); |
| snd_cx18_unlock(cxsc); |
| |
| if (!ret) |
| uctl->value.integer.value[0] = cx18_av_vol_to_dB(vctrl.value); |
| return ret; |
| } |
| |
| static int snd_cx18_mixer_tv_vol_put(struct snd_kcontrol *kctl, |
| struct snd_ctl_elem_value *uctl) |
| { |
| struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl); |
| struct cx18 *cx = to_cx18(cxsc->v4l2_dev); |
| struct v4l2_control vctrl; |
| int ret; |
| |
| vctrl.id = V4L2_CID_AUDIO_VOLUME; |
| vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]); |
| |
| snd_cx18_lock(cxsc); |
| |
| /* Fetch current state */ |
| ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl); |
| |
| if (ret || |
| (cx18_av_vol_to_dB(vctrl.value) != uctl->value.integer.value[0])) { |
| |
| /* Set, if needed */ |
| vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]); |
| ret = v4l2_subdev_call(cx->sd_av, core, s_ctrl, &vctrl); |
| if (!ret) |
| ret = 1; /* Indicate control was changed w/o error */ |
| } |
| snd_cx18_unlock(cxsc); |
| |
| return ret; |
| } |
| |
| |
| /* This is a bit of overkill, the slider is already in dB internally */ |
| static DECLARE_TLV_DB_SCALE(snd_cx18_mixer_tv_vol_db_scale, -9600, 100, 0); |
| |
| static struct snd_kcontrol_new snd_cx18_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_cx18_mixer_tv_volume_info, |
| .get = snd_cx18_mixer_tv_volume_get, |
| .put = snd_cx18_mixer_tv_volume_put, |
| .tlv.p = snd_cx18_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 CS5345 I2S volume for HVR-1600 */ |
| |
| int __init snd_cx18_mixer_create(struct snd_cx18_card *cxsc) |
| { |
| struct v4l2_device *v4l2_dev = cxsc->v4l2_dev; |
| struct snd_card *sc = cxsc->sc; |
| int ret; |
| |
| strlcpy(sc->mixername, "CX23418 Mixer", sizeof(sc->mixername)); |
| |
| ret = snd_ctl_add(sc, snd_ctl_new1(snd_cx18_mixer_tv_vol, cxsc)); |
| if (ret) { |
| CX18_ALSA_WARN("%s: failed to add %s control, err %d\n", |
| __func__, snd_cx18_mixer_tv_vol.name, ret); |
| } |
| return ret; |
| } |