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