90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
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/*
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* Copyright (C) 2020, Samsung Electronics Co. Ltd. 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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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*/
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#include <linux/miscdevice.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include "../../comm/shub_cmd.h"
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#include "../../sensor/scontext.h"
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#include "../../sensorhub/shub_device.h"
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#include "../../utility/shub_utility.h"
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struct miscdevice scontext_device;
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static ssize_t shub_scontext_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
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{
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int ret = 0;
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char *buffer;
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if (!is_shub_working()) {
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shub_errf("stop sending library data(is not working)");
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return -EIO;
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}
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if (unlikely(count < 2)) {
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shub_errf("library data length err(%d)", (int)count);
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return -EINVAL;
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}
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buffer = kzalloc(count * sizeof(char), GFP_KERNEL);
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if (!buffer) {
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shub_errf("fail to alloc memory");
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return -ENOMEM;
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}
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ret = copy_from_user(buffer, buf, count);
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if (unlikely(ret)) {
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shub_errf("memcpy for kernel buffer err");
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kfree(buffer);
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return -EFAULT;
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}
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shub_scontext_log(__func__, buffer, count);
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if (buffer[0] == SCONTEXT_INST_LIB_NOTI)
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ret = shub_scontext_send_cmd(buffer, count);
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else
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ret = shub_scontext_send_instruction(buffer, count);
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if (ret < 0)
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shub_errf("send library data err(%d)", ret);
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kfree(buffer);
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return (ret == 0) ? count : ret;
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}
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static const struct file_operations shub_scontext_fops = {
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.owner = THIS_MODULE,
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.open = nonseekable_open,
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.write = shub_scontext_write,
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};
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int register_misc_dev_scontext(bool en)
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{
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int res = 0;
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if (en) {
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scontext_device.minor = MISC_DYNAMIC_MINOR;
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scontext_device.name = "shub_sensorhub";
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scontext_device.fops = &shub_scontext_fops;
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res = misc_register(&scontext_device);
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} else {
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misc_deregister(&scontext_device);
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}
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return res;
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}
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