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/*
** =============================================================================
** Copyright (c) 2016 Texas Instruments Inc.
**
** 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; version 2.
**
** 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.
** File:
** tas2562-misc.c
**
** Description:
** misc driver for Texas Instruments TAS2562 High Performance 4W Smart Amplifier
**
** =============================================================================
*/
#define DEBUG
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>
#include <linux/firmware.h>
#include <linux/regmap.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/fcntl.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include "tas2562.h"
#include "tas2562-misc.h"
#include <linux/dma-mapping.h>
static int g_logEnable = 1;
static struct tas2562_priv *g_tas2562;
static int tas2562_file_open(struct inode *inode, struct file *file)
{
struct tas2562_priv *pTAS2562 = g_tas2562;
if (!try_module_get(THIS_MODULE))
return -ENODEV;
file->private_data = (void *)pTAS2562;
if (g_logEnable)
dev_info(pTAS2562->dev, "%s\n", __func__);
return 0;
}
static int tas2562_file_release(struct inode *inode, struct file *file)
{
struct tas2562_priv *pTAS2562 = (struct tas2562_priv *)file->private_data;
if (g_logEnable)
dev_info(pTAS2562->dev, "%s\n", __func__);
file->private_data = (void *)NULL;
module_put(THIS_MODULE);
return 0;
}
static ssize_t tas2562_file_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
struct tas2562_priv *pTAS2562 = (struct tas2562_priv *)file->private_data;
int ret = 0;
unsigned int nValue = 0;
unsigned char value = 0;
unsigned char *p_kBuf = NULL;
mutex_lock(&pTAS2562->file_lock);
switch (pTAS2562->mnDBGCmd) {
case TIAUDIO_CMD_REG_READ:
{
if (g_logEnable)
dev_info(pTAS2562->dev,
"TIAUDIO_CMD_REG_READ: current_reg = 0x%x, count=%d\n",
pTAS2562->mnCurrentReg, (int)count);
if (count == 1) {
ret = pTAS2562->read(pTAS2562, pTAS2562->mnCurrentReg, &nValue);
if (ret < 0) {
dev_err(pTAS2562->dev, "dev read fail %d\n", ret);
break;
}
value = (u8)nValue;
if (g_logEnable)
dev_info(pTAS2562->dev, "TIAUDIO_CMD_REG_READ: nValue=0x%x, value=0x%x\n",
nValue, value);
ret = copy_to_user(buf, &value, 1);
if (ret != 0) {
/* Failed to copy all the data, exit */
dev_err(pTAS2562->dev, "copy to user fail %d\n", ret);
}
} else if (count > 1) {
p_kBuf = kzalloc(count, GFP_KERNEL);
if (p_kBuf != NULL) {
ret = pTAS2562->bulk_read(pTAS2562, pTAS2562->mnCurrentReg, p_kBuf, count);
if (ret < 0) {
dev_err(pTAS2562->dev, "dev bulk read fail %d\n", ret);
} else {
ret = copy_to_user(buf, p_kBuf, count);
if (ret != 0) {
/* Failed to copy all the data, exit */
dev_err(pTAS2562->dev, "copy to user fail %d\n", ret);
}
}
kfree(p_kBuf);
} else {
dev_err(pTAS2562->dev, "read no mem\n");
}
}
}
break;
}
pTAS2562->mnDBGCmd = 0;
mutex_unlock(&pTAS2562->file_lock);
return count;
}
static ssize_t tas2562_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
struct tas2562_priv *pTAS2562 = (struct tas2562_priv *)file->private_data;
int ret = 0;
unsigned char *p_kBuf = NULL;
unsigned int reg = 0;
unsigned int len = 0;
mutex_lock(&pTAS2562->file_lock);
p_kBuf = kzalloc(count, GFP_KERNEL);
if (p_kBuf == NULL) {
dev_err(pTAS2562->dev, "write no mem\n");
goto err;
}
ret = copy_from_user(p_kBuf, buf, count);
if (ret != 0) {
dev_err(pTAS2562->dev, "copy_from_user failed.\n");
goto err;
}
pTAS2562->mnDBGCmd = p_kBuf[0];
switch (pTAS2562->mnDBGCmd) {
case TIAUDIO_CMD_REG_WITE:
if (count > 5) {
reg = ((unsigned int)p_kBuf[1] << 24) +
((unsigned int)p_kBuf[2] << 16) +
((unsigned int)p_kBuf[3] << 8) +
(unsigned int)p_kBuf[4];
len = count - 5;
if (len == 1) {
ret = pTAS2562->write(pTAS2562, reg, p_kBuf[5]);
if (g_logEnable)
dev_info(pTAS2562->dev,
"TIAUDIO_CMD_REG_WITE, Reg=0x%x, Val=0x%x\n",
reg, p_kBuf[5]);
} else {
ret = pTAS2562->bulk_write(pTAS2562, reg, &p_kBuf[5], len);
}
} else {
dev_err(pTAS2562->dev, "%s, write len fail, count=%d.\n",
__func__, (int)count);
}
pTAS2562->mnDBGCmd = 0;
break;
case TIAUDIO_CMD_REG_READ:
if (count == 5) {
pTAS2562->mnCurrentReg = ((unsigned int)p_kBuf[1] << 24) +
((unsigned int)p_kBuf[2] << 16) +
((unsigned int)p_kBuf[3] << 8) +
(unsigned int)p_kBuf[4];
if (g_logEnable) {
dev_info(pTAS2562->dev,
"TIAUDIO_CMD_REG_READ, whole=0x%x\n",
pTAS2562->mnCurrentReg);
}
} else {
dev_err(pTAS2562->dev, "read len fail.\n");
}
break;
}
err:
if (p_kBuf != NULL)
kfree(p_kBuf);
mutex_unlock(&pTAS2562->file_lock);
return count;
}
static const struct file_operations fops = {
.owner = THIS_MODULE,
.read = tas2562_file_read,
.write = tas2562_file_write,
.unlocked_ioctl = NULL,
.open = tas2562_file_open,
.release = tas2562_file_release,
};
#define MODULE_NAME "tas2562"
static struct miscdevice tas2562_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = MODULE_NAME,
.fops = &fops,
};
int tas2562_register_misc(struct tas2562_priv *pTAS2562)
{
int ret = 0;
g_tas2562 = pTAS2562;
ret = misc_register(&tas2562_misc);
if (ret) {
dev_err(pTAS2562->dev, "TAS2562 misc fail: %d\n", ret);
}
dev_info(pTAS2562->dev, "%s, leave\n", __func__);
return ret;
}
int tas2562_deregister_misc(struct tas2562_priv *pTAS2562)
{
misc_deregister(&tas2562_misc);
return 0;
}
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("TAS2562 Misc Smart Amplifier driver");
MODULE_LICENSE("GPL v2");
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