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b22537c6 NP |
1 | /* |
2 | * arch/arm/common/bL_switcher_dummy_if.c -- b.L switcher dummy interface | |
3 | * | |
4 | * Created by: Nicolas Pitre, November 2012 | |
5 | * Copyright: (C) 2012-2013 Linaro Limited | |
6 | * | |
7 | * Dummy interface to user space for debugging purpose only. | |
8 | * | |
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. | |
12 | */ | |
13 | ||
14 | #include <linux/init.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/fs.h> | |
17 | #include <linux/miscdevice.h> | |
18 | #include <asm/uaccess.h> | |
19 | #include <asm/bL_switcher.h> | |
20 | ||
21 | static ssize_t bL_switcher_write(struct file *file, const char __user *buf, | |
22 | size_t len, loff_t *pos) | |
23 | { | |
24 | unsigned char val[3]; | |
25 | unsigned int cpu, cluster; | |
26 | int ret; | |
27 | ||
28 | pr_debug("%s\n", __func__); | |
29 | ||
30 | if (len < 3) | |
31 | return -EINVAL; | |
32 | ||
33 | if (copy_from_user(val, buf, 3)) | |
34 | return -EFAULT; | |
35 | ||
36 | /* format: <cpu#>,<cluster#> */ | |
37 | if (val[0] < '0' || val[0] > '9' || | |
38 | val[1] != ',' || | |
39 | val[2] < '0' || val[2] > '1') | |
40 | return -EINVAL; | |
41 | ||
42 | cpu = val[0] - '0'; | |
43 | cluster = val[2] - '0'; | |
44 | ret = bL_switch_request(cpu, cluster); | |
45 | ||
46 | return ret ? : len; | |
47 | } | |
48 | ||
49 | static const struct file_operations bL_switcher_fops = { | |
50 | .write = bL_switcher_write, | |
51 | .owner = THIS_MODULE, | |
52 | }; | |
53 | ||
54 | static struct miscdevice bL_switcher_device = { | |
55 | MISC_DYNAMIC_MINOR, | |
56 | "b.L_switcher", | |
57 | &bL_switcher_fops | |
58 | }; | |
59 | ||
60 | static int __init bL_switcher_dummy_if_init(void) | |
61 | { | |
62 | return misc_register(&bL_switcher_device); | |
63 | } | |
64 | ||
65 | static void __exit bL_switcher_dummy_if_exit(void) | |
66 | { | |
67 | misc_deregister(&bL_switcher_device); | |
68 | } | |
69 | ||
70 | module_init(bL_switcher_dummy_if_init); | |
71 | module_exit(bL_switcher_dummy_if_exit); |