diff options
Diffstat (limited to 'drivers/watchdog/acquirewdt.c')
| -rw-r--r-- | drivers/watchdog/acquirewdt.c | 175 |
1 files changed, 81 insertions, 94 deletions
diff --git a/drivers/watchdog/acquirewdt.c b/drivers/watchdog/acquirewdt.c index 85269c365a1..5614416f103 100644 --- a/drivers/watchdog/acquirewdt.c +++ b/drivers/watchdog/acquirewdt.c @@ -1,10 +1,10 @@ /* * Acquire Single Board Computer Watchdog Timer driver * - * Based on wdt.c. Original copyright messages: + * 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 @@ -15,18 +15,18 @@ * 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 - * Can't add timeout - driver doesn't allow changing value + * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com> + * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT + * Can't add timeout - driver doesn't allow changing value */ /* * Theory of Operation: * The Watch-Dog Timer is provided to ensure that standalone * Systems can always recover from catastrophic conditions that - * caused the CPU to crash. This condition may have occured by + * caused the CPU to crash. This condition may have occurred by * external EMI or a software bug. When the CPU stops working * correctly, hardware on the board will either perform a hardware * reset (cold boot) or a non-maskable interrupt (NMI) to bring the @@ -52,45 +52,51 @@ * Includes, defines, variables, module parameters, ... */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + /* 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/miscdevice.h> /* For struct miscdevice */ #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/... */ +#include <linux/uaccess.h> /* For copy_to_user/put_user/... */ +#include <linux/io.h> /* For inb/outb/... */ /* Module information */ #define DRV_NAME "acquirewdt" -#define PFX DRV_NAME ": " #define WATCHDOG_NAME "Acquire WDT" -#define WATCHDOG_HEARTBEAT 0 /* There is no way to see what the correct time-out period is */ +/* There is no way to see what the correct time-out period is */ +#define WATCHDOG_HEARTBEAT 0 /* internal variables */ -static struct platform_device *acq_platform_device; /* the watchdog platform device */ +/* the watchdog platform device */ +static struct platform_device *acq_platform_device; static unsigned long acq_is_open; static char expect_close; /* module parameters */ -static int wdt_stop = 0x43; /* You must set this - there is no sane way to probe for this board. */ +/* You must set this - there is no sane way to probe for this board. */ +static int wdt_stop = 0x43; module_param(wdt_stop, int, 0); MODULE_PARM_DESC(wdt_stop, "Acquire WDT 'stop' io port (default 0x43)"); -static int wdt_start = 0x443; /* You must set this - there is no sane way to probe for this board. */ +/* You must set this - there is no sane way to probe for this board. */ +static int wdt_start = 0x443; 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=" __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 @@ -112,18 +118,18 @@ static void acq_stop(void) * /dev/watchdog handling */ -static ssize_t acq_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) +static ssize_t acq_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) { /* See if we got the magic character 'V' and reload the timer */ - if(count) { + if (count) { if (!nowayout) { size_t i; - /* note: just in case someone wrote the magic character - * five months ago... */ + five months ago... */ expect_close = 0; - - /* scan to see whether or not we got the magic character */ + /* scan to see whether or not we got the + magic character */ for (i = 0; i != count; i++) { char c; if (get_user(c, buf + i)) @@ -132,64 +138,55 @@ static ssize_t acq_write(struct file *file, const char __user *buf, size_t count expect_close = 42; } } - - /* Well, anyhow someone wrote to us, we should return that favour */ + /* Well, anyhow someone wrote to us, we should + return that favour */ acq_keepalive(); } return count; } -static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) +static long acq_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int options, retval = -EINVAL; void __user *argp = (void __user *)arg; int __user *p = argp; - static struct watchdog_info ident = - { + static const struct watchdog_info ident = { .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .firmware_version = 1, .identity = WATCHDOG_NAME, }; - switch(cmd) - { + switch (cmd) { case WDIOC_GETSUPPORT: - return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; + return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - - case WDIOC_KEEPALIVE: - acq_keepalive(); - return 0; - - case WDIOC_GETTIMEOUT: - return put_user(WATCHDOG_HEARTBEAT, p); + return put_user(0, p); case WDIOC_SETOPTIONS: { - if (get_user(options, p)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) - { - acq_stop(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) - { - acq_keepalive(); - retval = 0; - } - - return retval; + if (get_user(options, p)) + return -EFAULT; + if (options & WDIOS_DISABLECARD) { + acq_stop(); + retval = 0; + } + if (options & WDIOS_ENABLECARD) { + acq_keepalive(); + retval = 0; + } + return retval; } + case WDIOC_KEEPALIVE: + acq_keepalive(); + return 0; + + case WDIOC_GETTIMEOUT: + return put_user(WATCHDOG_HEARTBEAT, p); default: - return -ENOTTY; + return -ENOTTY; } } @@ -211,7 +208,7 @@ static int acq_close(struct inode *inode, struct file *file) if (expect_close == 42) { acq_stop(); } else { - printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); + pr_crit("Unexpected close, not stopping watchdog!\n"); acq_keepalive(); } clear_bit(0, &acq_is_open); @@ -227,7 +224,7 @@ static const struct file_operations acq_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = acq_write, - .ioctl = acq_ioctl, + .unlocked_ioctl = acq_ioctl, .open = acq_open, .release = acq_close, }; @@ -242,38 +239,32 @@ static struct miscdevice acq_miscdev = { * Init & exit routines */ -static int __devinit acq_probe(struct platform_device *dev) +static int __init acq_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; } - ret = misc_register(&acq_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. (nowayout=%d)\n", - nowayout); + pr_info("initialized. (nowayout=%d)\n", nowayout); return 0; - unreg_regions: release_region(wdt_start, 1); unreg_stop: @@ -283,12 +274,12 @@ out: return ret; } -static int __devexit acq_remove(struct platform_device *dev) +static int acq_remove(struct platform_device *dev) { misc_deregister(&acq_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; } @@ -300,8 +291,7 @@ static void acq_shutdown(struct platform_device *dev) } static struct platform_driver acquirewdt_driver = { - .probe = acq_probe, - .remove = __devexit_p(acq_remove), + .remove = acq_remove, .shutdown = acq_shutdown, .driver = { .owner = THIS_MODULE, @@ -313,22 +303,20 @@ 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; + pr_info("WDT driver for Acquire single board computer initialising\n"); - 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; - } + acq_platform_device = platform_device_register_simple(DRV_NAME, + -1, NULL, 0); + if (IS_ERR(acq_platform_device)) + return PTR_ERR(acq_platform_device); + err = platform_driver_probe(&acquirewdt_driver, acq_probe); + if (err) + goto unreg_platform_device; return 0; -unreg_platform_driver: - platform_driver_unregister(&acquirewdt_driver); +unreg_platform_device: + platform_device_unregister(acq_platform_device); return err; } @@ -336,7 +324,7 @@ 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"); + pr_info("Watchdog Module Unloaded\n"); } module_init(acq_init); @@ -345,4 +333,3 @@ module_exit(acq_exit); MODULE_AUTHOR("David Woodhouse"); MODULE_DESCRIPTION("Acquire Inc. Single Board Computer Watchdog Timer driver"); MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |