/* * 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-io.h" #include "cx18-cards.h" #include "cx18-audio.h" #define CX18_AUDIO_ENABLE 0xc72014 #define CX18_AI1_MUX_MASK 0x30 #define CX18_AI1_MUX_I2S1 0x00 #define CX18_AI1_MUX_I2S2 0x10 #define CX18_AI1_MUX_843_I2S 0x20 /* Selects the audio input and output according to the current settings. */ int cx18_audio_set_io(struct cx18 *cx) { const struct cx18_card_audio_input *in; u32 u, v; int err; /* Determine which input to use */ if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) in = &cx->card->radio_input; else in = &cx->card->audio_inputs[cx->audio_input]; /* handle muxer chips */ v4l2_subdev_call(cx->sd_extmux, audio, s_routing, (u32) in->muxer_input, 0, 0); err = cx18_call_hw_err(cx, cx->card->hw_audio_ctrl, audio, s_routing, in->audio_input, 0, 0); if (err) return err; /* FIXME - this internal mux should be abstracted to a subdev */ u = cx18_read_reg(cx, CX18_AUDIO_ENABLE); v = u & ~CX18_AI1_MUX_MASK; switch (in->audio_input) { case CX18_AV_AUDIO_SERIAL1: v |= CX18_AI1_MUX_I2S1; break; case CX18_AV_AUDIO_SERIAL2: v |= CX18_AI1_MUX_I2S2; break; default: v |= CX18_AI1_MUX_843_I2S; break; } if (v == u) { /* force a toggle of some AI1 MUX control bits */ u &= ~CX18_AI1_MUX_MASK; switch (in->audio_input) { case CX18_AV_AUDIO_SERIAL1: u |= CX18_AI1_MUX_843_I2S; break; case CX18_AV_AUDIO_SERIAL2: u |= CX18_AI1_MUX_843_I2S; break; default: u |= CX18_AI1_MUX_I2S1; break; } cx18_write_reg_expect(cx, u | 0xb00, CX18_AUDIO_ENABLE, u, CX18_AI1_MUX_MASK); } cx18_write_reg_expect(cx, v | 0xb00, CX18_AUDIO_ENABLE, v, CX18_AI1_MUX_MASK); return 0; }