119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
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/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/* add additional information to our printk's */
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#define pr_fmt(fmt) "%s: " fmt "\n", __func__
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include "hsic_sysmon.h"
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#include "sysmon.h"
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#define DRIVER_DESC "HSIC System monitor driver test"
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#define RD_BUF_SIZE 4096
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struct sysmon_test_dev {
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int buflen;
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char buf[RD_BUF_SIZE];
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};
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static struct sysmon_test_dev *sysmon_dev;
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static ssize_t sysmon_test_read(struct file *file, char __user *ubuf,
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size_t count, loff_t *ppos)
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{
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struct sysmon_test_dev *dev = sysmon_dev;
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int ret;
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if (!dev)
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return -ENODEV;
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ret = hsic_sysmon_read(HSIC_SYSMON_DEV_EXT_MODEM, dev->buf, RD_BUF_SIZE,
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&dev->buflen, 3000);
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if (!ret)
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return simple_read_from_buffer(ubuf, count, ppos,
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dev->buf, dev->buflen);
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return 0;
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}
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static ssize_t sysmon_test_write(struct file *file, const char __user *ubuf,
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size_t count, loff_t *ppos)
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{
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struct sysmon_test_dev *dev = sysmon_dev;
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int ret;
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if (!dev)
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return -ENODEV;
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if (copy_from_user(dev->buf, ubuf, count)) {
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pr_err("error copying for writing");
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return 0;
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}
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ret = hsic_sysmon_write(HSIC_SYSMON_DEV_EXT_MODEM,
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dev->buf, count, 1000);
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if (ret < 0) {
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pr_err("error writing to hsic_sysmon");
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return ret;
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}
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return count;
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}
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static int sysmon_test_open(struct inode *inode, struct file *file)
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{
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return hsic_sysmon_open(HSIC_SYSMON_DEV_EXT_MODEM);
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}
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static int sysmon_test_release(struct inode *inode, struct file *file)
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{
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hsic_sysmon_close(HSIC_SYSMON_DEV_EXT_MODEM);
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return 0;
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}
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static struct dentry *dfile;
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const struct file_operations sysmon_test_ops = {
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.read = sysmon_test_read,
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.write = sysmon_test_write,
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.open = sysmon_test_open,
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.release = sysmon_test_release
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};
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static int __init sysmon_test_init(void)
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{
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sysmon_dev = kzalloc(sizeof(*sysmon_dev), GFP_KERNEL);
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if (!sysmon_dev)
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return -ENOMEM;
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dfile = debugfs_create_file("hsic_sysmon_test", 0666, NULL,
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0, &sysmon_test_ops);
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return 0;
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}
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static void __exit sysmon_test_exit(void)
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{
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if (dfile)
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debugfs_remove(dfile);
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kfree(sysmon_dev);
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}
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module_init(sysmon_test_init);
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module_exit(sysmon_test_exit);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL v2");
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