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/*
* Copyright (C) 2012 Samsung Electronics
* R. Chandrasekar <rcsekar@samsung.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 <malloc.h>
#include <common.h>
#include <asm/io.h>
#include <i2c.h>
#include <i2s.h>
#include <sound.h>
#include "wm8994.h"
#include <asm/arch/sound.h>
/* defines */
#define SOUND_400_HZ 400
#define SOUND_BITS_IN_BYTE 8
static struct i2stx_info g_i2stx_pri;
static struct sound_codec_info g_codec_info;
/*
* get_sound_fdt_values gets fdt values for i2s parameters
*
* @param i2stx_info i2s transmitter transfer param structure
* @param blob FDT blob
*/
static void get_sound_i2s_values(struct i2stx_info *i2s)
{
i2s->base_address = samsung_get_base_i2s();
i2s->audio_pll_clk = I2S_PLL_CLK;
i2s->samplingrate = I2S_SAMPLING_RATE;
i2s->bitspersample = I2S_BITS_PER_SAMPLE;
i2s->channels = I2S_CHANNELS;
i2s->rfs = I2S_RFS;
i2s->bfs = I2S_BFS;
}
/*
* Gets fdt values for wm8994 config parameters
*
* @param pcodec_info codec information structure
* @param blob FDT blob
* @return int value, 0 for success
*/
static int get_sound_wm8994_values(struct sound_codec_info *pcodec_info)
{
int error = 0;
switch (AUDIO_COMPAT) {
case AUDIO_COMPAT_SPI:
debug("%s: Support not added for SPI interface\n", __func__);
return -1;
break;
case AUDIO_COMPAT_I2C:
pcodec_info->i2c_bus = AUDIO_I2C_BUS;
pcodec_info->i2c_dev_addr = AUDIO_I2C_REG;
debug("i2c dev addr = %d\n", pcodec_info->i2c_dev_addr);
break;
default:
debug("%s: Unknown compat id %d\n", __func__, AUDIO_COMPAT);
return -1;
}
if (error == -1) {
debug("fail to get wm8994 codec node properties\n");
return -1;
}
return 0;
}
/*
* Gets fdt values for codec config parameters
*
* @param pcodec_info codec information structure
* @param blob FDT blob
* @return int value, 0 for success
*/
static int get_sound_codec_values(struct sound_codec_info *pcodec_info)
{
int error = 0;
const char *codectype;
codectype = AUDIO_CODEC;
if (!strcmp(codectype, "wm8994")) {
pcodec_info->codec_type = CODEC_WM_8994;
error = get_sound_wm8994_values(pcodec_info);
} else {
error = -1;
}
if (error == -1) {
debug("fail to get sound codec node properties\n");
return -1;
}
return 0;
}
int sound_init(void)
{
int ret;
struct i2stx_info *pi2s_tx = &g_i2stx_pri;
struct sound_codec_info *pcodec_info = &g_codec_info;
/* Get the I2S Values */
get_sound_i2s_values(pi2s_tx);
/* Get the codec Values */
if (get_sound_codec_values(pcodec_info) < 0)
return -1;
ret = i2s_tx_init(pi2s_tx);
if (ret) {
debug("%s: Failed to init i2c transmit: ret=%d\n", __func__,
ret);
return ret;
}
/* Check the codec type and initialise the same */
if (pcodec_info->codec_type == CODEC_WM_8994) {
ret = wm8994_init(pcodec_info, WM8994_AIF2,
pi2s_tx->samplingrate,
(pi2s_tx->samplingrate * (pi2s_tx->rfs)),
pi2s_tx->bitspersample, pi2s_tx->channels);
} else {
debug("%s: Unknown code type %d\n", __func__,
pcodec_info->codec_type);
return -1;
}
if (ret) {
debug("%s: Codec init failed\n", __func__);
return -1;
}
return ret;
}
/*
* Generates square wave sound data for 1 second
*
* @param data data buffer pointer
* @param size size of the buffer
* @param freq frequency of the wave
*/
static void sound_prepare_buffer(unsigned short *data, int size, uint32_t freq)
{
const int sample = 48000;
const unsigned short amplitude = 16000; /* between 1 and 32767 */
const int period = freq ? sample / freq : 0;
const int half = period / 2;
assert(freq);
/* Make sure we don't overflow our buffer */
if (size % 2)
size--;
while (size) {
int i;
for (i = 0; size && i < half; i++) {
size -= 2;
*data++ = amplitude;
*data++ = amplitude;
}
for (i = 0; size && i < period - half; i++) {
size -= 2;
*data++ = -amplitude;
*data++ = -amplitude;
}
}
}
int sound_play(uint32_t msec, uint32_t frequency)
{
unsigned int *data;
unsigned long data_size;
unsigned int ret = 0;
/*Buffer length computation */
data_size = g_i2stx_pri.samplingrate * g_i2stx_pri.channels;
data_size *= (g_i2stx_pri.bitspersample / SOUND_BITS_IN_BYTE);
data = malloc(data_size);
if (data == NULL) {
debug("%s: malloc failed\n", __func__);
return -1;
}
sound_prepare_buffer((unsigned short *)data,
data_size / sizeof(unsigned short), frequency);
while (msec >= 1000) {
ret = i2s_transfer_tx_data(&g_i2stx_pri, data,
(data_size / sizeof(int)));
msec -= 1000;
}
if (msec) {
unsigned long size =
(data_size * msec) / (sizeof(int) * 1000);
ret = i2s_transfer_tx_data(&g_i2stx_pri, data, size);
}
free(data);
return ret;
}
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