91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* I2C bus wrapper for WM1808 codec on SAMSUNG YP-R1
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*
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* Copyright (c) 2013 Lorenzo Miori
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include "system.h"
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#include "audiohw.h"
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#include "wmcodec.h"
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#include "audio.h"
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#include "panic.h"
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#include "logf.h"
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#define I2C_SLAVE 0x0703
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/**
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* YP-R1's kernel has ALSA implementation of the WM1808, but it
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* unfortunately doesn't export any function to play with register.
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* For that reason we control the I2C bus directly, letting RB driver to do the rest
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* Assumption: no other ALSA applications are using the mixer!
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*/
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static int wmcodec_dev = -1;
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/* The ONLY tested freq for now is 44100, others are just stubs!! */
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const struct wmc_srctrl_entry wmc_srctrl_table[HW_NUM_FREQ] =
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{
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/* TODO fix PLL frequencies also for the other available rates */
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[HW_FREQ_44] = /* PLL = on */
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{
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.plln = 3 | (1 << 3),
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.pllk1 = 0x18, /* 11289600 */
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.pllk2 = 0x111,
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.pllk3 = 0x139,
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.mclkdiv = WMC_MCLKDIV_2,
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.filter = WMC_SR_48KHZ,
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},
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};
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void audiohw_init(void)
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{
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/* First of all we need to open the device */
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wmcodec_dev = open("/dev/i2c-1", O_RDWR);
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if (wmcodec_dev < 0)
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panicf("Failed to open /dev/i2c-1 device!\n");
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/* Let's set the slave address and if no error we are ready!*/
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int addr = 0x1a;
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if (ioctl(wmcodec_dev, I2C_SLAVE, addr) < 0)
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logf("Failed to set slave address!\n");
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}
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void wmcodec_write(int reg, int data)
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{
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unsigned char data2[2];
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/* |aaaaaaad|dddddddd| */
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data2[0] = (reg << 0x1) | ((data >> 8) & 0x1);
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data2[1] = data;
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if (write(wmcodec_dev, data2, 2) < 0)
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panicf("I2C device write error!\n");
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}
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void audiohw_enable_headphone_jack(bool enable)
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{
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/* We don't use this facility: we have a separate GPIO for that */
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(void)enable;
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}
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