projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| 7c0f6ba6 | 18 | #include <linux/uaccess.h> |
| b22537c6 NP |
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 | }; | |
| ca75d601 | 59 | module_misc_device(bL_switcher_device); |
| a21b4c10 AB |
60 | |
| 61 | MODULE_AUTHOR("Nicolas Pitre <nico@linaro.org>"); | |
| 62 | MODULE_LICENSE("GPL v2"); | |
| 63 | MODULE_DESCRIPTION("big.LITTLE switcher dummy user interface"); |