2 * arch/arm/common/bL_switcher_dummy_if.c -- b.L switcher dummy interface
4 * Created by: Nicolas Pitre, November 2012
5 * Copyright: (C) 2012-2013 Linaro Limited
7 * Dummy interface to user space for debugging purpose only.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/init.h>
15 #include <linux/module.h>
17 #include <linux/miscdevice.h>
18 #include <linux/uaccess.h>
19 #include <asm/bL_switcher.h>
21 static ssize_t bL_switcher_write(struct file *file, const char __user *buf,
22 size_t len, loff_t *pos)
25 unsigned int cpu, cluster;
28 pr_debug("%s\n", __func__);
33 if (copy_from_user(val, buf, 3))
36 /* format: <cpu#>,<cluster#> */
37 if (val[0] < '0' || val[0] > '9' ||
39 val[2] < '0' || val[2] > '1')
43 cluster = val[2] - '0';
44 ret = bL_switch_request(cpu, cluster);
49 static const struct file_operations bL_switcher_fops = {
50 .write = bL_switcher_write,
54 static struct miscdevice bL_switcher_device = {
59 module_misc_device(bL_switcher_device);
61 MODULE_AUTHOR("Nicolas Pitre <nico@linaro.org>");
62 MODULE_LICENSE("GPL v2");
63 MODULE_DESCRIPTION("big.LITTLE switcher dummy user interface");