61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/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
|
|
};
|
|
module_misc_device(bL_switcher_device);
|
|
|
|
MODULE_AUTHOR("Nicolas Pitre <nico@linaro.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("big.LITTLE switcher dummy user interface");
|