![Arjan van de Ven](/assets/img/avatar_default.png)
Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
165 lines
3.9 KiB
C
165 lines
3.9 KiB
C
/*
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* RTC subsystem, proc interface
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*
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* Copyright (C) 2005-06 Tower Technologies
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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*
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* based on arch/arm/common/rtctime.c
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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 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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static struct class_device *rtc_dev = NULL;
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static DEFINE_MUTEX(rtc_lock);
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static int rtc_proc_show(struct seq_file *seq, void *offset)
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{
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int err;
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struct class_device *class_dev = seq->private;
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const struct rtc_class_ops *ops = to_rtc_device(class_dev)->ops;
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struct rtc_wkalrm alrm;
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struct rtc_time tm;
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err = rtc_read_time(class_dev, &tm);
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if (err == 0) {
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seq_printf(seq,
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"rtc_time\t: %02d:%02d:%02d\n"
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"rtc_date\t: %04d-%02d-%02d\n",
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tm.tm_hour, tm.tm_min, tm.tm_sec,
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tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
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}
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err = rtc_read_alarm(class_dev, &alrm);
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if (err == 0) {
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seq_printf(seq, "alrm_time\t: ");
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if ((unsigned int)alrm.time.tm_hour <= 24)
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seq_printf(seq, "%02d:", alrm.time.tm_hour);
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else
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seq_printf(seq, "**:");
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if ((unsigned int)alrm.time.tm_min <= 59)
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seq_printf(seq, "%02d:", alrm.time.tm_min);
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else
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seq_printf(seq, "**:");
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if ((unsigned int)alrm.time.tm_sec <= 59)
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seq_printf(seq, "%02d\n", alrm.time.tm_sec);
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else
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seq_printf(seq, "**\n");
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seq_printf(seq, "alrm_date\t: ");
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if ((unsigned int)alrm.time.tm_year <= 200)
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seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
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else
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seq_printf(seq, "****-");
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if ((unsigned int)alrm.time.tm_mon <= 11)
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seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
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else
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seq_printf(seq, "**-");
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if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
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seq_printf(seq, "%02d\n", alrm.time.tm_mday);
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else
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seq_printf(seq, "**\n");
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seq_printf(seq, "alarm_IRQ\t: %s\n",
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alrm.enabled ? "yes" : "no");
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seq_printf(seq, "alrm_pending\t: %s\n",
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alrm.pending ? "yes" : "no");
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}
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seq_printf(seq, "24hr\t\t: yes\n");
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if (ops->proc)
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ops->proc(class_dev->dev, seq);
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return 0;
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}
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static int rtc_proc_open(struct inode *inode, struct file *file)
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{
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struct class_device *class_dev = PDE(inode)->data;
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if (!try_module_get(THIS_MODULE))
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return -ENODEV;
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return single_open(file, rtc_proc_show, class_dev);
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}
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static int rtc_proc_release(struct inode *inode, struct file *file)
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{
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int res = single_release(inode, file);
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module_put(THIS_MODULE);
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return res;
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}
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static const struct file_operations rtc_proc_fops = {
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.open = rtc_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = rtc_proc_release,
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};
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static int rtc_proc_add_device(struct class_device *class_dev,
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struct class_interface *class_intf)
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{
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mutex_lock(&rtc_lock);
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if (rtc_dev == NULL) {
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struct proc_dir_entry *ent;
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rtc_dev = class_dev;
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ent = create_proc_entry("driver/rtc", 0, NULL);
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if (ent) {
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struct rtc_device *rtc = to_rtc_device(class_dev);
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ent->proc_fops = &rtc_proc_fops;
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ent->owner = rtc->owner;
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ent->data = class_dev;
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dev_dbg(class_dev->dev, "rtc intf: proc\n");
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}
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else
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rtc_dev = NULL;
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}
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mutex_unlock(&rtc_lock);
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return 0;
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}
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static void rtc_proc_remove_device(struct class_device *class_dev,
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struct class_interface *class_intf)
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{
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mutex_lock(&rtc_lock);
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if (rtc_dev == class_dev) {
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remove_proc_entry("driver/rtc", NULL);
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rtc_dev = NULL;
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}
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mutex_unlock(&rtc_lock);
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}
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static struct class_interface rtc_proc_interface = {
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.add = &rtc_proc_add_device,
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.remove = &rtc_proc_remove_device,
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};
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static int __init rtc_proc_init(void)
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{
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return rtc_interface_register(&rtc_proc_interface);
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}
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static void __exit rtc_proc_exit(void)
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{
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class_interface_unregister(&rtc_proc_interface);
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}
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subsys_initcall(rtc_proc_init);
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module_exit(rtc_proc_exit);
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("RTC class proc interface");
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MODULE_LICENSE("GPL");
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