diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/watchdog/acquirewdt.c | 74 |
1 files changed, 41 insertions, 33 deletions
diff --git a/drivers/char/watchdog/acquirewdt.c b/drivers/char/watchdog/acquirewdt.c index 154d67e..a968f84 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/notifier.h> /* For reboot notifier */ +#include <linux/reboot.h> /* For reboot notifier */ +#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 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) @@ -240,11 +246,10 @@ 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, }; /* @@ -252,11 +257,14 @@ static struct miscdevice acq_miscdev= * turn the timebomb registers off. */ -static struct notifier_block acq_notifier = -{ +static struct notifier_block acq_notifier = { .notifier_call = acq_notify_sys, }; +/* + * Init & exit routines + */ + static int __init acq_init(void) { int ret; @@ -313,9 +321,9 @@ static void __exit acq_exit(void) { 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); } module_init(acq_init); |