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/*
* rt5677-spi.c -- RT5677 ALSA SoC audio codec driver
*
* Copyright 2013 Realtek Semiconductor Corp.
* Author: Oder Chiou <oder_chiou@realtek.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/input.h>
#include <linux/spi/spi.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_qos.h>
#include <linux/sysfs.h>
#include <linux/clk.h>
#include <linux/firmware.h>
#include "rt5677-spi.h"
static struct spi_device *g_spi;
/**
* rt5677_spi_write - Write data to SPI.
* @txbuf: Data Buffer for writing.
* @len: Data length.
*
*
* Returns true for success.
*/
int rt5677_spi_write(u8 *txbuf, size_t len)
{
int status;
status = spi_write(g_spi, txbuf, len);
if (status)
dev_err(&g_spi->dev, "rt5677_spi_write error %d\n", status);
return status;
}
/**
* rt5677_spi_burst_write - Write data to SPI by rt5677 dsp memory address.
* @addr: Start address.
* @txbuf: Data Buffer for writng.
* @len: Data length, it must be a multiple of 8.
*
*
* Returns true for success.
*/
int rt5677_spi_burst_write(u32 addr, const struct firmware *fw)
{
u8 spi_cmd = RT5677_SPI_CMD_BURST_WRITE;
u8 *write_buf;
unsigned int i, end, offset = 0;
write_buf = kmalloc(RT5677_SPI_BUF_LEN + 6, GFP_KERNEL);
if (write_buf == NULL)
return -ENOMEM;
while (offset < fw->size) {
if (offset + RT5677_SPI_BUF_LEN <= fw->size)
end = RT5677_SPI_BUF_LEN;
else
end = fw->size % RT5677_SPI_BUF_LEN;
write_buf[0] = spi_cmd;
write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;
for (i = 0; i < end; i += 8) {
write_buf[i + 12] = fw->data[offset + i + 0];
write_buf[i + 11] = fw->data[offset + i + 1];
write_buf[i + 10] = fw->data[offset + i + 2];
write_buf[i + 9] = fw->data[offset + i + 3];
write_buf[i + 8] = fw->data[offset + i + 4];
write_buf[i + 7] = fw->data[offset + i + 5];
write_buf[i + 6] = fw->data[offset + i + 6];
write_buf[i + 5] = fw->data[offset + i + 7];
}
write_buf[end + 5] = spi_cmd;
rt5677_spi_write(write_buf, end + 6);
offset += RT5677_SPI_BUF_LEN;
}
kfree(write_buf);
return 0;
}
static int rt5677_spi_probe(struct spi_device *spi)
{
g_spi = spi;
return 0;
}
static struct spi_driver rt5677_spi_driver = {
.driver = {
.name = "rt5677",
.owner = THIS_MODULE,
},
.probe = rt5677_spi_probe,
};
module_spi_driver(rt5677_spi_driver);
MODULE_DESCRIPTION("ASoC RT5677 SPI driver");
MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
MODULE_LICENSE("GPL v2");
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