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path: root/drivers/watchdog/advantechwdt.c
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Diffstat (limited to 'drivers/watchdog/advantechwdt.c')
-rw-r--r--drivers/watchdog/advantechwdt.c200
1 files changed, 91 insertions, 109 deletions
diff --git a/drivers/watchdog/advantechwdt.c b/drivers/watchdog/advantechwdt.c
index 8121cc24734..7796db7fa6e 100644
--- a/drivers/watchdog/advantechwdt.c
+++ b/drivers/watchdog/advantechwdt.c
@@ -6,8 +6,8 @@
* Based on acquirewdt.c which is based on wdt.c.
* Original copyright messages:
*
- * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
- * http://www.redhat.com
+ * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
+ * All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -18,7 +18,7 @@
* warranty for any of this software. This material is provided
* "AS-IS" and at no charge.
*
- * (c) Copyright 1995 Alan Cox <alan@redhat.com>
+ * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
*
* 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
* Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
@@ -28,6 +28,8 @@
* add wdt_start and wdt_stop as parameters.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
@@ -37,17 +39,16 @@
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
#define DRV_NAME "advantechwdt"
-#define PFX DRV_NAME ": "
#define WATCHDOG_NAME "Advantech WDT"
#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
-static struct platform_device *advwdt_platform_device; /* the watchdog platform device */
+/* the watchdog platform device */
+static struct platform_device *advwdt_platform_device;
static unsigned long advwdt_is_open;
static char adv_expect_close;
@@ -72,35 +73,35 @@ MODULE_PARM_DESC(wdt_start, "Advantech WDT 'start' io port (default 0x443)");
static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=63, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. 1<= timeout <=63, default="
+ __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
-static int nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
/*
* Watchdog Operations
*/
-static void
-advwdt_ping(void)
+static void advwdt_ping(void)
{
/* Write a watchdog value */
outb_p(timeout, wdt_start);
}
-static void
-advwdt_disable(void)
+static void advwdt_disable(void)
{
inb_p(wdt_stop);
}
-static int
-advwdt_set_heartbeat(int t)
+static int advwdt_set_heartbeat(int t)
{
- if ((t < 1) || (t > 63))
+ if (t < 1 || t > 63)
return -EINVAL;
-
timeout = t;
return 0;
}
@@ -109,8 +110,8 @@ advwdt_set_heartbeat(int t)
* /dev/watchdog handling
*/
-static ssize_t
-advwdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+static ssize_t advwdt_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
{
if (count) {
if (!nowayout) {
@@ -120,7 +121,7 @@ advwdt_write(struct file *file, const char __user *buf, size_t count, loff_t *pp
for (i = 0; i != count; i++) {
char c;
- if (get_user(c, buf+i))
+ if (get_user(c, buf + i))
return -EFAULT;
if (c == 'V')
adv_expect_close = 42;
@@ -131,72 +132,65 @@ advwdt_write(struct file *file, const char __user *buf, size_t count, loff_t *pp
return count;
}
-static int
-advwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static long advwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int new_timeout;
void __user *argp = (void __user *)arg;
int __user *p = argp;
- static struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+ static const struct watchdog_info ident = {
+ .options = WDIOF_KEEPALIVEPING |
+ WDIOF_SETTIMEOUT |
+ WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = WATCHDOG_NAME,
};
switch (cmd) {
case WDIOC_GETSUPPORT:
- if (copy_to_user(argp, &ident, sizeof(ident)))
- return -EFAULT;
- break;
+ if (copy_to_user(argp, &ident, sizeof(ident)))
+ return -EFAULT;
+ break;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
-
- case WDIOC_KEEPALIVE:
- advwdt_ping();
- break;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_timeout, p))
- return -EFAULT;
- if (advwdt_set_heartbeat(new_timeout))
- return -EINVAL;
- advwdt_ping();
- /* Fall */
-
- case WDIOC_GETTIMEOUT:
- return put_user(timeout, p);
+ return put_user(0, p);
case WDIOC_SETOPTIONS:
{
- int options, retval = -EINVAL;
-
- if (get_user(options, p))
- return -EFAULT;
-
- if (options & WDIOS_DISABLECARD) {
- advwdt_disable();
- retval = 0;
- }
-
- if (options & WDIOS_ENABLECARD) {
- advwdt_ping();
- retval = 0;
- }
+ int options, retval = -EINVAL;
- return retval;
+ if (get_user(options, p))
+ return -EFAULT;
+ if (options & WDIOS_DISABLECARD) {
+ advwdt_disable();
+ retval = 0;
+ }
+ if (options & WDIOS_ENABLECARD) {
+ advwdt_ping();
+ retval = 0;
+ }
+ return retval;
}
+ case WDIOC_KEEPALIVE:
+ advwdt_ping();
+ break;
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_timeout, p))
+ return -EFAULT;
+ if (advwdt_set_heartbeat(new_timeout))
+ return -EINVAL;
+ advwdt_ping();
+ /* Fall */
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout, p);
default:
- return -ENOTTY;
+ return -ENOTTY;
}
return 0;
}
-static int
-advwdt_open(struct inode *inode, struct file *file)
+static int advwdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &advwdt_is_open))
return -EBUSY;
@@ -208,13 +202,12 @@ advwdt_open(struct inode *inode, struct file *file)
return nonseekable_open(inode, file);
}
-static int
-advwdt_close(struct inode *inode, struct file *file)
+static int advwdt_close(struct inode *inode, struct file *file)
{
if (adv_expect_close == 42) {
advwdt_disable();
} else {
- printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
+ pr_crit("Unexpected close, not stopping watchdog!\n");
advwdt_ping();
}
clear_bit(0, &advwdt_is_open);
@@ -230,7 +223,7 @@ static const struct file_operations advwdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = advwdt_write,
- .ioctl = advwdt_ioctl,
+ .unlocked_ioctl = advwdt_ioctl,
.open = advwdt_open,
.release = advwdt_close,
};
@@ -245,44 +238,40 @@ static struct miscdevice advwdt_miscdev = {
* Init & exit routines
*/
-static int __devinit
-advwdt_probe(struct platform_device *dev)
+static int __init advwdt_probe(struct platform_device *dev)
{
int ret;
if (wdt_stop != wdt_start) {
if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
- printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
- wdt_stop);
+ pr_err("I/O address 0x%04x already in use\n",
+ wdt_stop);
ret = -EIO;
goto out;
}
}
if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
- printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
- wdt_start);
+ pr_err("I/O address 0x%04x already in use\n", wdt_start);
ret = -EIO;
goto unreg_stop;
}
- /* Check that the heartbeat value is within it's range ; if not reset to the default */
+ /* Check that the heartbeat value is within it's range ;
+ * if not reset to the default */
if (advwdt_set_heartbeat(timeout)) {
advwdt_set_heartbeat(WATCHDOG_TIMEOUT);
- printk (KERN_INFO PFX "timeout value must be 1<=x<=63, using %d\n",
- timeout);
+ pr_info("timeout value must be 1<=x<=63, using %d\n", timeout);
}
ret = misc_register(&advwdt_miscdev);
if (ret != 0) {
- printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
+ pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, ret);
goto unreg_regions;
}
-
- printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
+ pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
timeout, nowayout);
-
out:
return ret;
unreg_regions:
@@ -293,27 +282,24 @@ unreg_stop:
goto out;
}
-static int __devexit
-advwdt_remove(struct platform_device *dev)
+static int advwdt_remove(struct platform_device *dev)
{
misc_deregister(&advwdt_miscdev);
- release_region(wdt_start,1);
- if(wdt_stop != wdt_start)
- release_region(wdt_stop,1);
+ release_region(wdt_start, 1);
+ if (wdt_stop != wdt_start)
+ release_region(wdt_stop, 1);
return 0;
}
-static void
-advwdt_shutdown(struct platform_device *dev)
+static void advwdt_shutdown(struct platform_device *dev)
{
/* Turn the WDT off if we have a soft shutdown */
advwdt_disable();
}
static struct platform_driver advwdt_driver = {
- .probe = advwdt_probe,
- .remove = __devexit_p(advwdt_remove),
+ .remove = advwdt_remove,
.shutdown = advwdt_shutdown,
.driver = {
.owner = THIS_MODULE,
@@ -321,36 +307,33 @@ static struct platform_driver advwdt_driver = {
},
};
-static int __init
-advwdt_init(void)
+static int __init advwdt_init(void)
{
int err;
- printk(KERN_INFO "WDT driver for Advantech single board computer initialising.\n");
+ pr_info("WDT driver for Advantech single board computer initialising\n");
- err = platform_driver_register(&advwdt_driver);
- if (err)
- return err;
+ advwdt_platform_device = platform_device_register_simple(DRV_NAME,
+ -1, NULL, 0);
+ if (IS_ERR(advwdt_platform_device))
+ return PTR_ERR(advwdt_platform_device);
- advwdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
- if (IS_ERR(advwdt_platform_device)) {
- err = PTR_ERR(advwdt_platform_device);
- goto unreg_platform_driver;
- }
+ err = platform_driver_probe(&advwdt_driver, advwdt_probe);
+ if (err)
+ goto unreg_platform_device;
return 0;
-unreg_platform_driver:
- platform_driver_unregister(&advwdt_driver);
+unreg_platform_device:
+ platform_device_unregister(advwdt_platform_device);
return err;
}
-static void __exit
-advwdt_exit(void)
+static void __exit advwdt_exit(void)
{
platform_device_unregister(advwdt_platform_device);
platform_driver_unregister(&advwdt_driver);
- printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
+ pr_info("Watchdog Module Unloaded\n");
}
module_init(advwdt_init);
@@ -359,4 +342,3 @@ module_exit(advwdt_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marek Michalkiewicz <marekm@linux.org.pl>");
MODULE_DESCRIPTION("Advantech Single Board Computer WDT driver");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-11 05:37:51 +0000