61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch/arm/common/bL_switcher_dummy_if.c -- b.L switcher dummy interface
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*
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* Created by: Nicolas Pitre, November 2012
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* Copyright: (C) 2012-2013 Linaro Limited
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*
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* Dummy interface to user space for debugging purpose only.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/uaccess.h>
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#include <asm/bL_switcher.h>
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static ssize_t bL_switcher_write(struct file *file, const char __user *buf,
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size_t len, loff_t *pos)
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{
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unsigned char val[3];
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unsigned int cpu, cluster;
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int ret;
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pr_debug("%s\n", __func__);
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if (len < 3)
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return -EINVAL;
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if (copy_from_user(val, buf, 3))
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return -EFAULT;
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/* format: <cpu#>,<cluster#> */
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if (val[0] < '0' || val[0] > '9' ||
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val[1] != ',' ||
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val[2] < '0' || val[2] > '1')
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return -EINVAL;
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cpu = val[0] - '0';
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cluster = val[2] - '0';
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ret = bL_switch_request(cpu, cluster);
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return ret ? : len;
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}
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static const struct file_operations bL_switcher_fops = {
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.write = bL_switcher_write,
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.owner = THIS_MODULE,
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};
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static struct miscdevice bL_switcher_device = {
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MISC_DYNAMIC_MINOR,
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"b.L_switcher",
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&bL_switcher_fops
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};
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module_misc_device(bL_switcher_device);
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MODULE_AUTHOR("Nicolas Pitre <nico@linaro.org>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("big.LITTLE switcher dummy user interface");
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