100 lines
2 KiB
C
100 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 MediaTek Inc.
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*/
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#include <linux/types.h>
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#include <linux/module.h> /* needed by all modules */
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#include <linux/init.h> /* needed by module macros */
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#include <linux/fs.h> /* needed by file_operations* */
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#include <linux/miscdevice.h> /* needed by miscdevice* */
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#include <linux/device.h> /* needed by device_* */
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#include <linux/fs.h> /* needed by file_operations* */
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#include <linux/poll.h> /* needed by poll */
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#include <linux/mutex.h>
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#include <linux/atomic.h>
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#include "sspm_define.h"
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#include "sspm_sysfs.h"
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#include "sspm_logger.h"
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static wait_queue_head_t logwait;
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ssize_t __weak sspm_log_read(char __user *data, size_t len)
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{
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return 0;
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}
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unsigned int __weak sspm_log_poll(void)
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{
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return 0;
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}
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static ssize_t sspm_log_if_read(struct file *file, char __user *data,
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size_t len, loff_t *ppos)
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{
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ssize_t ret;
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ret = 0;
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if (access_ok(VERIFY_WRITE, data, len))
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ret = sspm_log_read(data, len);
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return ret;
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}
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static int sspm_log_if_open(struct inode *inode, struct file *file)
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{
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return nonseekable_open(inode, file);
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}
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static unsigned int sspm_log_if_poll(struct file *file, poll_table *wait)
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{
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unsigned int ret = 0;
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if (!(file->f_mode & FMODE_READ))
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return ret;
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poll_wait(file, &logwait, wait);
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ret = sspm_log_poll();
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return ret;
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}
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void sspm_log_if_wake(void)
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{
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wake_up(&logwait);
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}
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static const struct file_operations sspm_log_file_ops = {
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.owner = THIS_MODULE,
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.read = sspm_log_if_read,
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.open = sspm_log_if_open,
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.poll = sspm_log_if_poll,
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};
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static struct miscdevice sspm_log_device = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "sspm",
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.fops = &sspm_log_file_ops
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};
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int __init sspm_sysfs_init(void)
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{
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int ret;
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init_waitqueue_head(&logwait);
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ret = misc_register(&sspm_log_device);
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if (ret)
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return ret;
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return 0;
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}
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int sspm_sysfs_create_file(const struct device_attribute *attr)
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{
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return device_create_file(sspm_log_device.this_device, attr);
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}
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