| Hans Verkuil | 1c1e45d | 2008-04-28 20:24:33 -0300 | [diff] [blame^] | 1 | /* |
| 2 | * cx18 audio-related functions |
| 3 | * |
| 4 | * Derived from ivtv-audio.c |
| 5 | * |
| 6 | * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 21 | * 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include "cx18-driver.h" |
| 25 | #include "cx18-i2c.h" |
| 26 | #include "cx18-cards.h" |
| 27 | #include "cx18-audio.h" |
| 28 | |
| 29 | /* Selects the audio input and output according to the current |
| 30 | settings. */ |
| 31 | int cx18_audio_set_io(struct cx18 *cx) |
| 32 | { |
| 33 | struct v4l2_routing route; |
| 34 | u32 audio_input; |
| 35 | int mux_input; |
| 36 | |
| 37 | /* Determine which input to use */ |
| 38 | if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) { |
| 39 | audio_input = cx->card->radio_input.audio_input; |
| 40 | mux_input = cx->card->radio_input.muxer_input; |
| 41 | } else { |
| 42 | audio_input = |
| 43 | cx->card->audio_inputs[cx->audio_input].audio_input; |
| 44 | mux_input = |
| 45 | cx->card->audio_inputs[cx->audio_input].muxer_input; |
| 46 | } |
| 47 | |
| 48 | /* handle muxer chips */ |
| 49 | route.input = mux_input; |
| 50 | route.output = 0; |
| 51 | cx18_i2c_hw(cx, cx->card->hw_muxer, VIDIOC_INT_S_AUDIO_ROUTING, &route); |
| 52 | |
| 53 | route.input = audio_input; |
| 54 | return cx18_i2c_hw(cx, cx->card->hw_audio_ctrl, |
| 55 | VIDIOC_INT_S_AUDIO_ROUTING, &route); |
| 56 | } |
| 57 | |
| 58 | void cx18_audio_set_route(struct cx18 *cx, struct v4l2_routing *route) |
| 59 | { |
| 60 | cx18_i2c_hw(cx, cx->card->hw_audio_ctrl, |
| 61 | VIDIOC_INT_S_AUDIO_ROUTING, route); |
| 62 | } |
| 63 | |
| 64 | void cx18_audio_set_audio_clock_freq(struct cx18 *cx, u8 freq) |
| 65 | { |
| 66 | static u32 freqs[3] = { 44100, 48000, 32000 }; |
| 67 | |
| 68 | /* The audio clock of the digitizer must match the codec sample |
| 69 | rate otherwise you get some very strange effects. */ |
| 70 | if (freq > 2) |
| 71 | return; |
| 72 | cx18_call_i2c_clients(cx, VIDIOC_INT_AUDIO_CLOCK_FREQ, &freqs[freq]); |
| 73 | } |