72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
|
/*
|
||
|
|
* arch/arm/common/bL_switcher_dummy_if.c -- b.L switcher dummy interface
|
||
|
|
*
|
||
|
|
* Created by: Nicolas Pitre, November 2012
|
||
|
|
* Copyright: (C) 2012-2013 Linaro Limited
|
||
|
|
*
|
||
|
|
* Dummy interface to user space for debugging purpose only.
|
||
|
|
*
|
||
|
|
* 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/init.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/fs.h>
|
||
|
|
#include <linux/miscdevice.h>
|
||
|
|
#include <asm/uaccess.h>
|
||
|
|
#include <asm/bL_switcher.h>
|
||
|
|
|
||
|
|
static ssize_t bL_switcher_write(struct file *file, const char __user *buf,
|
||
|
|
size_t len, loff_t *pos)
|
||
|
|
{
|
||
|
|
unsigned char val[3];
|
||
|
|
unsigned int cpu, cluster;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
pr_debug("%s\n", __func__);
|
||
|
|
|
||
|
|
if (len < 3)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (copy_from_user(val, buf, 3))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* format: <cpu#>,<cluster#> */
|
||
|
|
if (val[0] < '0' || val[0] > '9' ||
|
||
|
|
val[1] != ',' ||
|
||
|
|
val[2] < '0' || val[2] > '1')
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
cpu = val[0] - '0';
|
||
|
|
cluster = val[2] - '0';
|
||
|
|
ret = bL_switch_request(cpu, cluster);
|
||
|
|
|
||
|
|
return ret ? : len;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct file_operations bL_switcher_fops = {
|
||
|
|
.write = bL_switcher_write,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct miscdevice bL_switcher_device = {
|
||
|
|
MISC_DYNAMIC_MINOR,
|
||
|
|
"b.L_switcher",
|
||
|
|
&bL_switcher_fops
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init bL_switcher_dummy_if_init(void)
|
||
|
|
{
|
||
|
|
return misc_register(&bL_switcher_device);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit bL_switcher_dummy_if_exit(void)
|
||
|
|
{
|
||
|
|
misc_deregister(&bL_switcher_device);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(bL_switcher_dummy_if_init);
|
||
|
|
module_exit(bL_switcher_dummy_if_exit);
|