diff options
Diffstat (limited to 'drivers/media/video/cx18/cx18-audio.c')
| -rw-r--r-- | drivers/media/video/cx18/cx18-audio.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/media/video/cx18/cx18-audio.c b/drivers/media/video/cx18/cx18-audio.c new file mode 100644 index 000000000000..1adc404d955e --- /dev/null +++ b/drivers/media/video/cx18/cx18-audio.c @@ -0,0 +1,73 @@ +/* + * cx18 audio-related functions + * + * Derived from ivtv-audio.c + * + * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> + * + * 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 "cx18-driver.h" +#include "cx18-i2c.h" +#include "cx18-cards.h" +#include "cx18-audio.h" + +/* Selects the audio input and output according to the current + settings. */ +int cx18_audio_set_io(struct cx18 *cx) +{ + struct v4l2_routing route; + u32 audio_input; + int mux_input; + + /* Determine which input to use */ + if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) { + audio_input = cx->card->radio_input.audio_input; + mux_input = cx->card->radio_input.muxer_input; + } else { + audio_input = + cx->card->audio_inputs[cx->audio_input].audio_input; + mux_input = + cx->card->audio_inputs[cx->audio_input].muxer_input; + } + + /* handle muxer chips */ + route.input = mux_input; + route.output = 0; + cx18_i2c_hw(cx, cx->card->hw_muxer, VIDIOC_INT_S_AUDIO_ROUTING, &route); + + route.input = audio_input; + return cx18_i2c_hw(cx, cx->card->hw_audio_ctrl, + VIDIOC_INT_S_AUDIO_ROUTING, &route); +} + +void cx18_audio_set_route(struct cx18 *cx, struct v4l2_routing *route) +{ + cx18_i2c_hw(cx, cx->card->hw_audio_ctrl, + VIDIOC_INT_S_AUDIO_ROUTING, route); +} + +void cx18_audio_set_audio_clock_freq(struct cx18 *cx, u8 freq) +{ + static u32 freqs[3] = { 44100, 48000, 32000 }; + + /* The audio clock of the digitizer must match the codec sample + rate otherwise you get some very strange effects. */ + if (freq > 2) + return; + cx18_call_i2c_clients(cx, VIDIOC_INT_AUDIO_CLOCK_FREQ, &freqs[freq]); +} |