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path: root/drivers/char/watchdog/acquirewdt.c
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Diffstat (limited to 'drivers/char/watchdog/acquirewdt.c')
-rw-r--r--drivers/char/watchdog/acquirewdt.c155
1 files changed, 88 insertions, 67 deletions
diff --git a/drivers/char/watchdog/acquirewdt.c b/drivers/char/watchdog/acquirewdt.c
index 154d67e591e..85269c365a1 100644
--- a/drivers/char/watchdog/acquirewdt.c
+++ b/drivers/char/watchdog/acquirewdt.c
@@ -48,46 +48,52 @@
* It can be 1, 2, 10, 20, 110 or 220 seconds.
*/
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/fs.h>
-#include <linux/ioport.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
-#include <linux/init.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
+/*
+ * Includes, defines, variables, module parameters, ...
+ */
+/* Includes */
+#include <linux/module.h> /* For module specific items */
+#include <linux/moduleparam.h> /* For new moduleparam's */
+#include <linux/types.h> /* For standard types (like size_t) */
+#include <linux/errno.h> /* For the -ENODEV/... values */
+#include <linux/kernel.h> /* For printk/panic/... */
+#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
+#include <linux/watchdog.h> /* For the watchdog specific items */
+#include <linux/fs.h> /* For file operations */
+#include <linux/ioport.h> /* For io-port access */
+#include <linux/platform_device.h> /* For platform_driver framework */
+#include <linux/init.h> /* For __init/__exit/... */
+
+#include <asm/uaccess.h> /* For copy_to_user/put_user/... */
+#include <asm/io.h> /* For inb/outb/... */
+
+/* Module information */
+#define DRV_NAME "acquirewdt"
+#define PFX DRV_NAME ": "
#define WATCHDOG_NAME "Acquire WDT"
-#define PFX WATCHDOG_NAME ": "
#define WATCHDOG_HEARTBEAT 0 /* There is no way to see what the correct time-out period is */
+/* internal variables */
+static struct platform_device *acq_platform_device; /* the watchdog platform device */
static unsigned long acq_is_open;
static char expect_close;
-/*
- * You must set these - there is no sane way to probe for this board.
- */
-
-static int wdt_stop = 0x43;
+/* module parameters */
+static int wdt_stop = 0x43; /* You must set this - there is no sane way to probe for this board. */
module_param(wdt_stop, int, 0);
MODULE_PARM_DESC(wdt_stop, "Acquire WDT 'stop' io port (default 0x43)");
-static int wdt_start = 0x443;
+static int wdt_start = 0x443; /* You must set this - there is no sane way to probe for this board. */
module_param(wdt_start, int, 0);
MODULE_PARM_DESC(wdt_start, "Acquire WDT 'start' io port (default 0x443)");
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
/*
- * Kernel methods.
+ * Watchdog Operations
*/
static void acq_keepalive(void)
@@ -103,7 +109,7 @@ static void acq_stop(void)
}
/*
- * /dev/watchdog handling.
+ * /dev/watchdog handling
*/
static ssize_t acq_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
@@ -143,7 +149,7 @@ static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
{
.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
.firmware_version = 1,
- .identity = "Acquire WDT",
+ .identity = WATCHDOG_NAME,
};
switch(cmd)
@@ -214,20 +220,6 @@ static int acq_close(struct inode *inode, struct file *file)
}
/*
- * Notifier for system down
- */
-
-static int acq_notify_sys(struct notifier_block *this, unsigned long code,
- void *unused)
-{
- if(code==SYS_DOWN || code==SYS_HALT) {
- /* Turn the WDT off */
- acq_stop();
- }
- return NOTIFY_DONE;
-}
-
-/*
* Kernel Interfaces
*/
@@ -240,29 +232,20 @@ static const struct file_operations acq_fops = {
.release = acq_close,
};
-static struct miscdevice acq_miscdev=
-{
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &acq_fops,
+static struct miscdevice acq_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &acq_fops,
};
/*
- * The WDT card needs to learn about soft shutdowns in order to
- * turn the timebomb registers off.
+ * Init & exit routines
*/
-static struct notifier_block acq_notifier =
-{
- .notifier_call = acq_notify_sys,
-};
-
-static int __init acq_init(void)
+static int __devinit acq_probe(struct platform_device *dev)
{
int ret;
- printk(KERN_INFO "WDT driver for Acquire single board computer initialising.\n");
-
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",
@@ -279,18 +262,11 @@ static int __init acq_init(void)
goto unreg_stop;
}
- ret = register_reboot_notifier(&acq_notifier);
- if (ret != 0) {
- printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
- ret);
- goto unreg_regions;
- }
-
ret = misc_register(&acq_miscdev);
if (ret != 0) {
printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
- goto unreg_reboot;
+ goto unreg_regions;
}
printk (KERN_INFO PFX "initialized. (nowayout=%d)\n",
@@ -298,8 +274,6 @@ static int __init acq_init(void)
return 0;
-unreg_reboot:
- unregister_reboot_notifier(&acq_notifier);
unreg_regions:
release_region(wdt_start, 1);
unreg_stop:
@@ -309,13 +283,60 @@ out:
return ret;
}
-static void __exit acq_exit(void)
+static int __devexit acq_remove(struct platform_device *dev)
{
misc_deregister(&acq_miscdev);
- unregister_reboot_notifier(&acq_notifier);
+ release_region(wdt_start,1);
if(wdt_stop != wdt_start)
release_region(wdt_stop,1);
- release_region(wdt_start,1);
+
+ return 0;
+}
+
+static void acq_shutdown(struct platform_device *dev)
+{
+ /* Turn the WDT off if we have a soft shutdown */
+ acq_stop();
+}
+
+static struct platform_driver acquirewdt_driver = {
+ .probe = acq_probe,
+ .remove = __devexit_p(acq_remove),
+ .shutdown = acq_shutdown,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRV_NAME,
+ },
+};
+
+static int __init acq_init(void)
+{
+ int err;
+
+ printk(KERN_INFO "WDT driver for Acquire single board computer initialising.\n");
+
+ err = platform_driver_register(&acquirewdt_driver);
+ if (err)
+ return err;
+
+ acq_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
+ if (IS_ERR(acq_platform_device)) {
+ err = PTR_ERR(acq_platform_device);
+ goto unreg_platform_driver;
+ }
+
+ return 0;
+
+unreg_platform_driver:
+ platform_driver_unregister(&acquirewdt_driver);
+ return err;
+}
+
+static void __exit acq_exit(void)
+{
+ platform_device_unregister(acq_platform_device);
+ platform_driver_unregister(&acquirewdt_driver);
+ printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
}
module_init(acq_init);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-18 14:15:52 +0000