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path: root/drivers/watchdog/ib700wdt.c
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Diffstat (limited to 'drivers/watchdog/ib700wdt.c')
-rw-r--r--drivers/watchdog/ib700wdt.c207
1 files changed, 92 insertions, 115 deletions
diff --git a/drivers/watchdog/ib700wdt.c b/drivers/watchdog/ib700wdt.c
index 4b89f401691..4247c498ee7 100644
--- a/drivers/watchdog/ib700wdt.c
+++ b/drivers/watchdog/ib700wdt.c
@@ -11,8 +11,8 @@
* 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
@@ -23,7 +23,7 @@
* 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
@@ -31,6 +31,8 @@
*
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
@@ -41,10 +43,9 @@
#include <linux/spinlock.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
static struct platform_device *ibwdt_platform_device;
static unsigned long ibwdt_is_open;
@@ -53,7 +54,6 @@ static char expect_close;
/* Module information */
#define DRV_NAME "ib700wdt"
-#define PFX DRV_NAME ": "
/*
*
@@ -91,45 +91,32 @@ static char expect_close;
*
*/
-static int wd_times[] = {
- 30, /* 0x0 */
- 28, /* 0x1 */
- 26, /* 0x2 */
- 24, /* 0x3 */
- 22, /* 0x4 */
- 20, /* 0x5 */
- 18, /* 0x6 */
- 16, /* 0x7 */
- 14, /* 0x8 */
- 12, /* 0x9 */
- 10, /* 0xA */
- 8, /* 0xB */
- 6, /* 0xC */
- 4, /* 0xD */
- 2, /* 0xE */
- 0, /* 0xF */
-};
-
#define WDT_STOP 0x441
#define WDT_START 0x443
/* Default timeout */
-#define WD_TIMO 0 /* 30 seconds +/- 20%, from table */
-
-static int wd_margin = WD_TIMO;
+#define WATCHDOG_TIMEOUT 30 /* 30 seconds +/- 20% */
+static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. 0<= timeout <=30, 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
-ibwdt_ping(void)
+static void ibwdt_ping(void)
{
+ int wd_margin = 15 - ((timeout + 1) / 2);
+
spin_lock(&ibwdt_lock);
/* Write a watchdog value */
@@ -138,26 +125,19 @@ ibwdt_ping(void)
spin_unlock(&ibwdt_lock);
}
-static void
-ibwdt_disable(void)
+static void ibwdt_disable(void)
{
spin_lock(&ibwdt_lock);
outb_p(0, WDT_STOP);
spin_unlock(&ibwdt_lock);
}
-static int
-ibwdt_set_heartbeat(int t)
+static int ibwdt_set_heartbeat(int t)
{
- int i;
-
- if ((t < 0) || (t > 30))
+ if (t < 0 || t > 30)
return -EINVAL;
- for (i = 0x0F; i > -1; i--)
- if (wd_times[i] > t)
- break;
- wd_margin = i;
+ timeout = t;
return 0;
}
@@ -165,8 +145,8 @@ ibwdt_set_heartbeat(int t)
* /dev/watchdog handling
*/
-static ssize_t
-ibwdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+static ssize_t ibwdt_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
{
if (count) {
if (!nowayout) {
@@ -188,77 +168,71 @@ ibwdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppo
return count;
}
-static int
-ibwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static long ibwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int new_margin;
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 = "IB700 WDT",
};
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:
- ibwdt_ping();
- break;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_margin, p))
- return -EFAULT;
- if (ibwdt_set_heartbeat(new_margin))
- return -EINVAL;
- ibwdt_ping();
- /* Fall */
-
- case WDIOC_GETTIMEOUT:
- return put_user(wd_times[wd_margin], p);
+ return put_user(0, p);
case WDIOC_SETOPTIONS:
{
- int options, retval = -EINVAL;
+ int options, retval = -EINVAL;
- if (get_user(options, p))
- return -EFAULT;
+ if (get_user(options, p))
+ return -EFAULT;
- if (options & WDIOS_DISABLECARD) {
- ibwdt_disable();
- retval = 0;
- }
+ if (options & WDIOS_DISABLECARD) {
+ ibwdt_disable();
+ retval = 0;
+ }
+ if (options & WDIOS_ENABLECARD) {
+ ibwdt_ping();
+ retval = 0;
+ }
+ return retval;
+ }
+ case WDIOC_KEEPALIVE:
+ ibwdt_ping();
+ break;
- if (options & WDIOS_ENABLECARD) {
- ibwdt_ping();
- retval = 0;
- }
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_margin, p))
+ return -EFAULT;
+ if (ibwdt_set_heartbeat(new_margin))
+ return -EINVAL;
+ ibwdt_ping();
+ /* Fall */
- return retval;
- }
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout, p);
default:
- return -ENOTTY;
+ return -ENOTTY;
}
return 0;
}
-static int
-ibwdt_open(struct inode *inode, struct file *file)
+static int ibwdt_open(struct inode *inode, struct file *file)
{
- if (test_and_set_bit(0, &ibwdt_is_open)) {
+ if (test_and_set_bit(0, &ibwdt_is_open))
return -EBUSY;
- }
if (nowayout)
__module_get(THIS_MODULE);
@@ -267,13 +241,12 @@ ibwdt_open(struct inode *inode, struct file *file)
return nonseekable_open(inode, file);
}
-static int
-ibwdt_close(struct inode *inode, struct file *file)
+static int ibwdt_close(struct inode *inode, struct file *file)
{
if (expect_close == 42) {
ibwdt_disable();
} else {
- printk(KERN_CRIT PFX "WDT device closed unexpectedly. WDT will not stop!\n");
+ pr_crit("WDT device closed unexpectedly. WDT will not stop!\n");
ibwdt_ping();
}
clear_bit(0, &ibwdt_is_open);
@@ -289,7 +262,7 @@ static const struct file_operations ibwdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = ibwdt_write,
- .ioctl = ibwdt_ioctl,
+ .unlocked_ioctl = ibwdt_ioctl,
.open = ibwdt_open,
.release = ibwdt_close,
};
@@ -304,27 +277,34 @@ static struct miscdevice ibwdt_miscdev = {
* Init & exit routines
*/
-static int __devinit ibwdt_probe(struct platform_device *dev)
+static int __init ibwdt_probe(struct platform_device *dev)
{
int res;
#if WDT_START != WDT_STOP
if (!request_region(WDT_STOP, 1, "IB700 WDT")) {
- printk (KERN_ERR PFX "STOP method I/O %X is not available.\n", WDT_STOP);
+ pr_err("STOP method I/O %X is not available\n", WDT_STOP);
res = -EIO;
goto out_nostopreg;
}
#endif
if (!request_region(WDT_START, 1, "IB700 WDT")) {
- printk (KERN_ERR PFX "START method I/O %X is not available.\n", WDT_START);
+ pr_err("START method I/O %X is not available\n", WDT_START);
res = -EIO;
goto out_nostartreg;
}
+ /* Check that the heartbeat value is within it's range ;
+ * if not reset to the default */
+ if (ibwdt_set_heartbeat(timeout)) {
+ ibwdt_set_heartbeat(WATCHDOG_TIMEOUT);
+ pr_info("timeout value must be 0<=x<=30, using %d\n", timeout);
+ }
+
res = misc_register(&ibwdt_miscdev);
if (res) {
- printk (KERN_ERR PFX "failed to register misc device\n");
+ pr_err("failed to register misc device\n");
goto out_nomisc;
}
return 0;
@@ -339,12 +319,12 @@ out_nostopreg:
return res;
}
-static int __devexit ibwdt_remove(struct platform_device *dev)
+static int ibwdt_remove(struct platform_device *dev)
{
misc_deregister(&ibwdt_miscdev);
- release_region(WDT_START,1);
+ release_region(WDT_START, 1);
#if WDT_START != WDT_STOP
- release_region(WDT_STOP,1);
+ release_region(WDT_STOP, 1);
#endif
return 0;
}
@@ -356,8 +336,7 @@ static void ibwdt_shutdown(struct platform_device *dev)
}
static struct platform_driver ibwdt_driver = {
- .probe = ibwdt_probe,
- .remove = __devexit_p(ibwdt_remove),
+ .remove = ibwdt_remove,
.shutdown = ibwdt_shutdown,
.driver = {
.owner = THIS_MODULE,
@@ -369,22 +348,21 @@ static int __init ibwdt_init(void)
{
int err;
- printk(KERN_INFO PFX "WDT driver for IB700 single board computer initialising.\n");
+ pr_info("WDT driver for IB700 single board computer initialising\n");
- err = platform_driver_register(&ibwdt_driver);
- if (err)
- return err;
+ ibwdt_platform_device = platform_device_register_simple(DRV_NAME,
+ -1, NULL, 0);
+ if (IS_ERR(ibwdt_platform_device))
+ return PTR_ERR(ibwdt_platform_device);
- ibwdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
- if (IS_ERR(ibwdt_platform_device)) {
- err = PTR_ERR(ibwdt_platform_device);
- goto unreg_platform_driver;
- }
+ err = platform_driver_probe(&ibwdt_driver, ibwdt_probe);
+ if (err)
+ goto unreg_platform_device;
return 0;
-unreg_platform_driver:
- platform_driver_unregister(&ibwdt_driver);
+unreg_platform_device:
+ platform_device_unregister(ibwdt_platform_device);
return err;
}
@@ -392,7 +370,7 @@ static void __exit ibwdt_exit(void)
{
platform_device_unregister(ibwdt_platform_device);
platform_driver_unregister(&ibwdt_driver);
- printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
+ pr_info("Watchdog Module Unloaded\n");
}
module_init(ibwdt_init);
@@ -401,6 +379,5 @@ module_exit(ibwdt_exit);
MODULE_AUTHOR("Charles Howes <chowes@vsol.net>");
MODULE_DESCRIPTION("IB700 SBC watchdog driver");
MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
/* end of ib700wdt.c */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-09 20:31:27 +0000