// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  cx18 audio-related functions
 *
 *  Derived from ivtv-audio.c
 *
 *  Copyright (C) 2007  Hans Verkuil <hverkuil@kernel.org>
 */

#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;
}