![Wim Van Sebroeck](/assets/img/avatar_default.png)
nowayout is actually a boolean value. So make it bool for all watchdog device drivers. Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
269 lines
5.3 KiB
C
269 lines
5.3 KiB
C
/*
|
|
* Watchdog driver for SBC-FITPC2 board
|
|
*
|
|
* Author: Denis Turischev <denis@compulab.co.il>
|
|
*
|
|
* Adapted from the IXP2000 watchdog driver by Deepak Saxena.
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME " WATCHDOG: " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/init.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/dmi.h>
|
|
#include <linux/io.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/system.h>
|
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
static unsigned int margin = 60; /* (secs) Default is 1 minute */
|
|
static unsigned long wdt_status;
|
|
static DEFINE_MUTEX(wdt_lock);
|
|
|
|
#define WDT_IN_USE 0
|
|
#define WDT_OK_TO_CLOSE 1
|
|
|
|
#define COMMAND_PORT 0x4c
|
|
#define DATA_PORT 0x48
|
|
|
|
#define IFACE_ON_COMMAND 1
|
|
#define REBOOT_COMMAND 2
|
|
|
|
#define WATCHDOG_NAME "SBC-FITPC2 Watchdog"
|
|
|
|
static void wdt_send_data(unsigned char command, unsigned char data)
|
|
{
|
|
outb(data, DATA_PORT);
|
|
msleep(200);
|
|
outb(command, COMMAND_PORT);
|
|
msleep(100);
|
|
}
|
|
|
|
static void wdt_enable(void)
|
|
{
|
|
mutex_lock(&wdt_lock);
|
|
wdt_send_data(IFACE_ON_COMMAND, 1);
|
|
wdt_send_data(REBOOT_COMMAND, margin);
|
|
mutex_unlock(&wdt_lock);
|
|
}
|
|
|
|
static void wdt_disable(void)
|
|
{
|
|
mutex_lock(&wdt_lock);
|
|
wdt_send_data(IFACE_ON_COMMAND, 0);
|
|
wdt_send_data(REBOOT_COMMAND, 0);
|
|
mutex_unlock(&wdt_lock);
|
|
}
|
|
|
|
static int fitpc2_wdt_open(struct inode *inode, struct file *file)
|
|
{
|
|
if (test_and_set_bit(WDT_IN_USE, &wdt_status))
|
|
return -EBUSY;
|
|
|
|
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
|
|
|
wdt_enable();
|
|
|
|
return nonseekable_open(inode, file);
|
|
}
|
|
|
|
static ssize_t fitpc2_wdt_write(struct file *file, const char *data,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
size_t i;
|
|
|
|
if (!len)
|
|
return 0;
|
|
|
|
if (nowayout) {
|
|
len = 0;
|
|
goto out;
|
|
}
|
|
|
|
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
|
|
|
for (i = 0; i != len; i++) {
|
|
char c;
|
|
|
|
if (get_user(c, data + i))
|
|
return -EFAULT;
|
|
|
|
if (c == 'V')
|
|
set_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
|
}
|
|
|
|
out:
|
|
wdt_enable();
|
|
|
|
return len;
|
|
}
|
|
|
|
|
|
static const struct watchdog_info ident = {
|
|
.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
|
|
WDIOF_KEEPALIVEPING,
|
|
.identity = WATCHDOG_NAME,
|
|
};
|
|
|
|
|
|
static long fitpc2_wdt_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
int ret = -ENOTTY;
|
|
int time;
|
|
|
|
switch (cmd) {
|
|
case WDIOC_GETSUPPORT:
|
|
ret = copy_to_user((struct watchdog_info *)arg, &ident,
|
|
sizeof(ident)) ? -EFAULT : 0;
|
|
break;
|
|
|
|
case WDIOC_GETSTATUS:
|
|
ret = put_user(0, (int *)arg);
|
|
break;
|
|
|
|
case WDIOC_GETBOOTSTATUS:
|
|
ret = put_user(0, (int *)arg);
|
|
break;
|
|
|
|
case WDIOC_KEEPALIVE:
|
|
wdt_enable();
|
|
ret = 0;
|
|
break;
|
|
|
|
case WDIOC_SETTIMEOUT:
|
|
ret = get_user(time, (int *)arg);
|
|
if (ret)
|
|
break;
|
|
|
|
if (time < 31 || time > 255) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
margin = time;
|
|
wdt_enable();
|
|
/* Fall through */
|
|
|
|
case WDIOC_GETTIMEOUT:
|
|
ret = put_user(margin, (int *)arg);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int fitpc2_wdt_release(struct inode *inode, struct file *file)
|
|
{
|
|
if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) {
|
|
wdt_disable();
|
|
pr_info("Device disabled\n");
|
|
} else {
|
|
pr_warn("Device closed unexpectedly - timer will not stop\n");
|
|
wdt_enable();
|
|
}
|
|
|
|
clear_bit(WDT_IN_USE, &wdt_status);
|
|
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static const struct file_operations fitpc2_wdt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.write = fitpc2_wdt_write,
|
|
.unlocked_ioctl = fitpc2_wdt_ioctl,
|
|
.open = fitpc2_wdt_open,
|
|
.release = fitpc2_wdt_release,
|
|
};
|
|
|
|
static struct miscdevice fitpc2_wdt_miscdev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &fitpc2_wdt_fops,
|
|
};
|
|
|
|
static int __init fitpc2_wdt_init(void)
|
|
{
|
|
int err;
|
|
const char *brd_name;
|
|
|
|
brd_name = dmi_get_system_info(DMI_BOARD_NAME);
|
|
|
|
if (!brd_name || !strstr(brd_name, "SBC-FITPC2"))
|
|
return -ENODEV;
|
|
|
|
pr_info("%s found\n", brd_name);
|
|
|
|
if (!request_region(COMMAND_PORT, 1, WATCHDOG_NAME)) {
|
|
pr_err("I/O address 0x%04x already in use\n", COMMAND_PORT);
|
|
return -EIO;
|
|
}
|
|
|
|
if (!request_region(DATA_PORT, 1, WATCHDOG_NAME)) {
|
|
pr_err("I/O address 0x%04x already in use\n", DATA_PORT);
|
|
err = -EIO;
|
|
goto err_data_port;
|
|
}
|
|
|
|
if (margin < 31 || margin > 255) {
|
|
pr_err("margin must be in range 31 - 255 seconds, you tried to set %d\n",
|
|
margin);
|
|
err = -EINVAL;
|
|
goto err_margin;
|
|
}
|
|
|
|
err = misc_register(&fitpc2_wdt_miscdev);
|
|
if (err) {
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
WATCHDOG_MINOR, err);
|
|
goto err_margin;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_margin:
|
|
release_region(DATA_PORT, 1);
|
|
err_data_port:
|
|
release_region(COMMAND_PORT, 1);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __exit fitpc2_wdt_exit(void)
|
|
{
|
|
misc_deregister(&fitpc2_wdt_miscdev);
|
|
release_region(DATA_PORT, 1);
|
|
release_region(COMMAND_PORT, 1);
|
|
}
|
|
|
|
module_init(fitpc2_wdt_init);
|
|
module_exit(fitpc2_wdt_exit);
|
|
|
|
MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
|
|
MODULE_DESCRIPTION("SBC-FITPC2 Watchdog");
|
|
|
|
module_param(margin, int, 0);
|
|
MODULE_PARM_DESC(margin, "Watchdog margin in seconds (default 60s)");
|
|
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
|