diff options
Diffstat (limited to 'drivers/char/watchdog/sbc_epx_c3.c')
| -rw-r--r-- | drivers/char/watchdog/sbc_epx_c3.c | 223 |
1 files changed, 0 insertions, 223 deletions
diff --git a/drivers/char/watchdog/sbc_epx_c3.c b/drivers/char/watchdog/sbc_epx_c3.c deleted file mode 100644 index 82cbd8809a69..000000000000 --- a/drivers/char/watchdog/sbc_epx_c3.c +++ /dev/null @@ -1,223 +0,0 @@ -/* - * SBC EPX C3 0.1 A Hardware Watchdog Device for the Winsystems EPX-C3 - * single board computer - * - * (c) Copyright 2006 Calin A. Culianu <calin@ajvar.org>, 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 - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - * based on softdog.c by Alan Cox <alan@redhat.com> - */ - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/mm.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/notifier.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/ioport.h> -#include <asm/uaccess.h> -#include <asm/io.h> - -#define PFX "epx_c3: " -static int epx_c3_alive; - -#define WATCHDOG_TIMEOUT 1 /* 1 sec default 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) ")"); - -#define EPXC3_WATCHDOG_CTL_REG 0x1ee /* write 1 to enable, 0 to disable */ -#define EPXC3_WATCHDOG_PET_REG 0x1ef /* write anything to pet once enabled */ - -static void epx_c3_start(void) -{ - outb(1, EPXC3_WATCHDOG_CTL_REG); -} - -static void epx_c3_stop(void) -{ - - outb(0, EPXC3_WATCHDOG_CTL_REG); - - printk(KERN_INFO PFX "Stopped watchdog timer.\n"); -} - -static void epx_c3_pet(void) -{ - outb(1, EPXC3_WATCHDOG_PET_REG); -} - -/* - * Allow only one person to hold it open - */ -static int epx_c3_open(struct inode *inode, struct file *file) -{ - if (epx_c3_alive) - return -EBUSY; - - if (nowayout) - __module_get(THIS_MODULE); - - /* Activate timer */ - epx_c3_start(); - epx_c3_pet(); - - epx_c3_alive = 1; - printk(KERN_INFO "Started watchdog timer.\n"); - - return nonseekable_open(inode, file); -} - -static int epx_c3_release(struct inode *inode, struct file *file) -{ - /* Shut off the timer. - * Lock it in if it's a module and we defined ...NOWAYOUT */ - if (!nowayout) - epx_c3_stop(); /* Turn the WDT off */ - - epx_c3_alive = 0; - - return 0; -} - -static ssize_t epx_c3_write(struct file *file, const char __user *data, - size_t len, loff_t *ppos) -{ - /* Refresh the timer. */ - if (len) - epx_c3_pet(); - return len; -} - -static int epx_c3_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - int options, retval = -EINVAL; - int __user *argp = (void __user *)arg; - static struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING | - WDIOF_MAGICCLOSE, - .firmware_version = 0, - .identity = "Winsystems EPX-C3 H/W Watchdog", - }; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &ident, sizeof(ident))) - return -EFAULT; - return 0; - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, argp); - case WDIOC_KEEPALIVE: - epx_c3_pet(); - return 0; - case WDIOC_GETTIMEOUT: - return put_user(WATCHDOG_TIMEOUT, argp); - case WDIOC_SETOPTIONS: - if (get_user(options, argp)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - epx_c3_stop(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) { - epx_c3_start(); - retval = 0; - } - - return retval; - default: - return -ENOTTY; - } -} - -static int epx_c3_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) - epx_c3_stop(); /* Turn the WDT off */ - - return NOTIFY_DONE; -} - -static const struct file_operations epx_c3_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = epx_c3_write, - .ioctl = epx_c3_ioctl, - .open = epx_c3_open, - .release = epx_c3_release, -}; - -static struct miscdevice epx_c3_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &epx_c3_fops, -}; - -static struct notifier_block epx_c3_notifier = { - .notifier_call = epx_c3_notify_sys, -}; - -static const char banner[] __initdata = - KERN_INFO PFX "Hardware Watchdog Timer for Winsystems EPX-C3 SBC: 0.1\n"; - -static int __init watchdog_init(void) -{ - int ret; - - if (!request_region(EPXC3_WATCHDOG_CTL_REG, 2, "epxc3_watchdog")) - return -EBUSY; - - ret = register_reboot_notifier(&epx_c3_notifier); - if (ret) { - printk(KERN_ERR PFX "cannot register reboot notifier " - "(err=%d)\n", ret); - goto out; - } - - ret = misc_register(&epx_c3_miscdev); - if (ret) { - printk(KERN_ERR PFX "cannot register miscdev on minor=%d " - "(err=%d)\n", WATCHDOG_MINOR, ret); - unregister_reboot_notifier(&epx_c3_notifier); - goto out; - } - - printk(banner); - - return 0; - -out: - release_region(EPXC3_WATCHDOG_CTL_REG, 2); - return ret; -} - -static void __exit watchdog_exit(void) -{ - misc_deregister(&epx_c3_miscdev); - unregister_reboot_notifier(&epx_c3_notifier); - release_region(EPXC3_WATCHDOG_CTL_REG, 2); -} - -module_init(watchdog_init); -module_exit(watchdog_exit); - -MODULE_AUTHOR("Calin A. Culianu <calin@ajvar.org>"); -MODULE_DESCRIPTION("Hardware Watchdog Device for Winsystems EPX-C3 SBC. Note that there is no way to probe for this device -- so only use it if you are *sure* you are runnning on this specific SBC system from Winsystems! It writes to IO ports 0x1ee and 0x1ef!"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |