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![Tim Schmielau](/assets/img/avatar_default.png)
I recently picked up my older work to remove unnecessary #includes of sched.h, starting from a patch by Dave Jones to not include sched.h from module.h. This reduces the number of indirect includes of sched.h by ~300. Another ~400 pointless direct includes can be removed after this disentangling (patch to follow later). However, quite a few indirect includes need to be fixed up for this. In order to feed the patches through -mm with as little disturbance as possible, I've split out the fixes I accumulated up to now (complete for i386 and x86_64, more archs to follow later) and post them before the real patch. This way this large part of the patch is kept simple with only adding #includes, and all hunks are independent of each other. So if any hunk rejects or gets in the way of other patches, just drop it. My scripts will pick it up again in the next round. Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
303 lines
6.5 KiB
C
303 lines
6.5 KiB
C
/*
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* MixCom Watchdog: A Simple Hardware Watchdog Device
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* Based on Softdog driver by Alan Cox and PC Watchdog driver by Ken Hollis
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*
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* Author: Gergely Madarasz <gorgo@itc.hu>
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*
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* Copyright (c) 1999 ITConsult-Pro Co. <info@itc.hu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Version 0.1 (99/04/15):
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* - first version
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*
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* Version 0.2 (99/06/16):
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* - added kernel timer watchdog ping after close
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* since the hardware does not support watchdog shutdown
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*
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* Version 0.3 (99/06/21):
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* - added WDIOC_GETSTATUS and WDIOC_GETSUPPORT ioctl calls
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*
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* Version 0.3.1 (99/06/22):
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* - allow module removal while internal timer is active,
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* print warning about probable reset
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*
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* Version 0.4 (99/11/15):
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* - support for one more type board
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*
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* Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com>
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* - added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
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*
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*/
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#define VERSION "0.5"
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/ioport.h>
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#include <linux/watchdog.h>
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#include <linux/fs.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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static int mixcomwd_ioports[] = { 0x180, 0x280, 0x380, 0x000 };
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#define MIXCOM_WATCHDOG_OFFSET 0xc10
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#define MIXCOM_ID 0x11
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#define FLASHCOM_WATCHDOG_OFFSET 0x4
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#define FLASHCOM_ID 0x18
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static unsigned long mixcomwd_opened; /* long req'd for setbit --RR */
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static int watchdog_port;
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static int mixcomwd_timer_alive;
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static DEFINE_TIMER(mixcomwd_timer, NULL, 0, 0);
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static char expect_close;
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
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static void mixcomwd_ping(void)
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{
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outb_p(55,watchdog_port);
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return;
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}
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static void mixcomwd_timerfun(unsigned long d)
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{
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mixcomwd_ping();
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mod_timer(&mixcomwd_timer,jiffies+ 5*HZ);
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}
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/*
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* Allow only one person to hold it open
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*/
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static int mixcomwd_open(struct inode *inode, struct file *file)
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{
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if(test_and_set_bit(0,&mixcomwd_opened)) {
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return -EBUSY;
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}
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mixcomwd_ping();
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if (nowayout) {
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/*
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* fops_get() code via open() has already done
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* a try_module_get() so it is safe to do the
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* __module_get().
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*/
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__module_get(THIS_MODULE);
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} else {
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if(mixcomwd_timer_alive) {
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del_timer(&mixcomwd_timer);
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mixcomwd_timer_alive=0;
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}
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}
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return nonseekable_open(inode, file);
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}
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static int mixcomwd_release(struct inode *inode, struct file *file)
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{
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if (expect_close == 42) {
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if(mixcomwd_timer_alive) {
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printk(KERN_ERR "mixcomwd: release called while internal timer alive");
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return -EBUSY;
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}
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init_timer(&mixcomwd_timer);
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mixcomwd_timer.expires=jiffies + 5 * HZ;
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mixcomwd_timer.function=mixcomwd_timerfun;
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mixcomwd_timer.data=0;
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mixcomwd_timer_alive=1;
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add_timer(&mixcomwd_timer);
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} else {
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printk(KERN_CRIT "mixcomwd: WDT device closed unexpectedly. WDT will not stop!\n");
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}
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clear_bit(0,&mixcomwd_opened);
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expect_close=0;
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return 0;
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}
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static ssize_t mixcomwd_write(struct file *file, const char __user *data, size_t len, loff_t *ppos)
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{
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if(len)
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{
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if (!nowayout) {
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size_t i;
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/* In case it was set long ago */
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expect_close = 0;
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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expect_close = 42;
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}
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}
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mixcomwd_ping();
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}
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return len;
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}
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static int mixcomwd_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int status;
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static struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.firmware_version = 1,
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.identity = "MixCOM watchdog",
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};
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switch(cmd)
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{
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case WDIOC_GETSTATUS:
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status=mixcomwd_opened;
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if (!nowayout) {
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status|=mixcomwd_timer_alive;
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}
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if (copy_to_user(p, &status, sizeof(int))) {
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return -EFAULT;
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}
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break;
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &ident, sizeof(ident))) {
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return -EFAULT;
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}
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break;
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case WDIOC_KEEPALIVE:
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mixcomwd_ping();
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break;
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default:
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return -ENOIOCTLCMD;
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}
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return 0;
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}
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static struct file_operations mixcomwd_fops=
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{
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = mixcomwd_write,
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.ioctl = mixcomwd_ioctl,
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.open = mixcomwd_open,
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.release = mixcomwd_release,
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};
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static struct miscdevice mixcomwd_miscdev=
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{
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &mixcomwd_fops,
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};
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static int __init mixcomwd_checkcard(int port)
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{
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int id;
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port += MIXCOM_WATCHDOG_OFFSET;
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if (!request_region(port, 1, "MixCOM watchdog")) {
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return 0;
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}
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id=inb_p(port) & 0x3f;
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if(id!=MIXCOM_ID) {
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release_region(port, 1);
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return 0;
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}
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return port;
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}
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static int __init flashcom_checkcard(int port)
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{
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int id;
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port += FLASHCOM_WATCHDOG_OFFSET;
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if (!request_region(port, 1, "MixCOM watchdog")) {
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return 0;
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}
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id=inb_p(port);
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if(id!=FLASHCOM_ID) {
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release_region(port, 1);
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return 0;
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}
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return port;
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}
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static int __init mixcomwd_init(void)
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{
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int i;
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int ret;
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int found=0;
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for (i = 0; !found && mixcomwd_ioports[i] != 0; i++) {
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watchdog_port = mixcomwd_checkcard(mixcomwd_ioports[i]);
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if (watchdog_port) {
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found = 1;
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}
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}
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/* The FlashCOM card can be set up at 0x300 -> 0x378, in 0x8 jumps */
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for (i = 0x300; !found && i < 0x380; i+=0x8) {
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watchdog_port = flashcom_checkcard(i);
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if (watchdog_port) {
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found = 1;
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}
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}
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if (!found) {
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printk("mixcomwd: No card detected, or port not available.\n");
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return -ENODEV;
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}
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ret = misc_register(&mixcomwd_miscdev);
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if (ret)
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{
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release_region(watchdog_port, 1);
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return ret;
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}
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printk(KERN_INFO "MixCOM watchdog driver v%s, watchdog port at 0x%3x\n",VERSION,watchdog_port);
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return 0;
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}
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static void __exit mixcomwd_exit(void)
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{
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if (!nowayout) {
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if(mixcomwd_timer_alive) {
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printk(KERN_WARNING "mixcomwd: I quit now, hardware will"
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" probably reboot!\n");
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del_timer(&mixcomwd_timer);
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mixcomwd_timer_alive=0;
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}
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}
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release_region(watchdog_port,1);
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misc_deregister(&mixcomwd_miscdev);
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}
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module_init(mixcomwd_init);
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module_exit(mixcomwd_exit);
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MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>");
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MODULE_DESCRIPTION("MixCom Watchdog driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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