diff options
Diffstat (limited to 'drivers/watchdog/w83697ug_wdt.c')
| -rw-r--r-- | drivers/watchdog/w83697ug_wdt.c | 397 |
1 files changed, 0 insertions, 397 deletions
diff --git a/drivers/watchdog/w83697ug_wdt.c b/drivers/watchdog/w83697ug_wdt.c deleted file mode 100644 index ff58cb74671..00000000000 --- a/drivers/watchdog/w83697ug_wdt.c +++ /dev/null @@ -1,397 +0,0 @@ -/* - * w83697ug/uf WDT driver - * - * (c) Copyright 2008 Flemming Fransen <ff@nrvissing.net> - * reused original code to support w83697ug/uf. - * - * Based on w83627hf_wdt.c which is based on advantechwdt.c - * which is based on wdt.c. - * Original copyright messages: - * - * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com> - * added support for W83627THF. - * - * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com> - * - * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> - * - * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. - * http://www.redhat.com - * - * 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. - * - * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide - * warranty for any of this software. This material is provided - * "AS-IS" and at no charge. - * - * (c) Copyright 1995 Alan Cox <alan@redhat.com> - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#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 <linux/spinlock.h> -#include <linux/io.h> -#include <linux/uaccess.h> - - -#define WATCHDOG_NAME "w83697ug/uf WDT" -#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ - -static unsigned long wdt_is_open; -static char expect_close; -static DEFINE_SPINLOCK(io_lock); - -static int wdt_io = 0x2e; -module_param(wdt_io, int, 0); -MODULE_PARM_DESC(wdt_io, "w83697ug/uf WDT io port (default 0x2e)"); - -static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ -module_param(timeout, int, 0); -MODULE_PARM_DESC(timeout, - "Watchdog timeout in seconds. 1<= timeout <=255 (default=" - __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); - -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) ")"); - -/* - * Kernel methods. - */ - -#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */ -#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register - (same as EFER) */ -#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */ - -static int w83697ug_select_wd_register(void) -{ - unsigned char c; - unsigned char version; - - outb_p(0x87, WDT_EFER); /* Enter extended function mode */ - outb_p(0x87, WDT_EFER); /* Again according to manual */ - - outb(0x20, WDT_EFER); /* check chip version */ - version = inb(WDT_EFDR); - - if (version == 0x68) { /* W83697UG */ - pr_info("Watchdog chip version 0x%02x = W83697UG/UF found at 0x%04x\n", - version, wdt_io); - - outb_p(0x2b, WDT_EFER); - c = inb_p(WDT_EFDR); /* select WDT0 */ - c &= ~0x04; - outb_p(0x2b, WDT_EFER); - outb_p(c, WDT_EFDR); /* set pin118 to WDT0 */ - - } else { - pr_err("No W83697UG/UF could be found\n"); - return -ENODEV; - } - - outb_p(0x07, WDT_EFER); /* point to logical device number reg */ - outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */ - outb_p(0x30, WDT_EFER); /* select CR30 */ - c = inb_p(WDT_EFDR); - outb_p(c | 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */ - - return 0; -} - -static void w83697ug_unselect_wd_register(void) -{ - outb_p(0xAA, WDT_EFER); /* Leave extended function mode */ -} - -static int w83697ug_init(void) -{ - int ret; - unsigned char t; - - ret = w83697ug_select_wd_register(); - if (ret != 0) - return ret; - - outb_p(0xF6, WDT_EFER); /* Select CRF6 */ - t = inb_p(WDT_EFDR); /* read CRF6 */ - if (t != 0) { - pr_info("Watchdog already running. Resetting timeout to %d sec\n", - timeout); - outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */ - } - outb_p(0xF5, WDT_EFER); /* Select CRF5 */ - t = inb_p(WDT_EFDR); /* read CRF5 */ - t &= ~0x0C; /* set second mode & - disable keyboard turning off watchdog */ - outb_p(t, WDT_EFDR); /* Write back to CRF5 */ - - w83697ug_unselect_wd_register(); - return 0; -} - -static void wdt_ctrl(int timeout) -{ - spin_lock(&io_lock); - - if (w83697ug_select_wd_register() < 0) { - spin_unlock(&io_lock); - return; - } - - outb_p(0xF4, WDT_EFER); /* Select CRF4 */ - outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF4 */ - - w83697ug_unselect_wd_register(); - - spin_unlock(&io_lock); -} - -static int wdt_ping(void) -{ - wdt_ctrl(timeout); - return 0; -} - -static int wdt_disable(void) -{ - wdt_ctrl(0); - return 0; -} - -static int wdt_set_heartbeat(int t) -{ - if (t < 1 || t > 255) - return -EINVAL; - - timeout = t; - return 0; -} - -static ssize_t wdt_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - if (count) { - if (!nowayout) { - size_t i; - - expect_close = 0; - - for (i = 0; i != count; i++) { - char c; - if (get_user(c, buf + i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - } - wdt_ping(); - } - return count; -} - -static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - int new_timeout; - static const struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING | - WDIOF_SETTIMEOUT | - WDIOF_MAGICCLOSE, - .firmware_version = 1, - .identity = "W83697UG WDT", - }; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &ident, sizeof(ident))) - return -EFAULT; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - - case WDIOC_SETOPTIONS: - { - int options, retval = -EINVAL; - - if (get_user(options, p)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - wdt_disable(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) { - wdt_ping(); - retval = 0; - } - - return retval; - } - - case WDIOC_KEEPALIVE: - wdt_ping(); - break; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, p)) - return -EFAULT; - if (wdt_set_heartbeat(new_timeout)) - return -EINVAL; - wdt_ping(); - /* Fall */ - - case WDIOC_GETTIMEOUT: - return put_user(timeout, p); - - default: - return -ENOTTY; - } - return 0; -} - -static int wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(0, &wdt_is_open)) - return -EBUSY; - /* - * Activate - */ - - wdt_ping(); - return nonseekable_open(inode, file); -} - -static int wdt_close(struct inode *inode, struct file *file) -{ - if (expect_close == 42) - wdt_disable(); - else { - pr_crit("Unexpected close, not stopping watchdog!\n"); - wdt_ping(); - } - expect_close = 0; - clear_bit(0, &wdt_is_open); - return 0; -} - -/* - * Notifier for system down - */ - -static int wdt_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) - wdt_disable(); /* Turn the WDT off */ - - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - -static const struct file_operations wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wdt_write, - .unlocked_ioctl = wdt_ioctl, - .open = wdt_open, - .release = wdt_close, -}; - -static struct miscdevice wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &wdt_fops, -}; - -/* - * The WDT needs to learn about soft shutdowns in order to - * turn the timebomb registers off. - */ - -static struct notifier_block wdt_notifier = { - .notifier_call = wdt_notify_sys, -}; - -static int __init wdt_init(void) -{ - int ret; - - pr_info("WDT driver for the Winbond(TM) W83697UG/UF Super I/O chip initialising\n"); - - if (wdt_set_heartbeat(timeout)) { - wdt_set_heartbeat(WATCHDOG_TIMEOUT); - pr_info("timeout value must be 1<=timeout<=255, using %d\n", - WATCHDOG_TIMEOUT); - } - - if (!request_region(wdt_io, 1, WATCHDOG_NAME)) { - pr_err("I/O address 0x%04x already in use\n", wdt_io); - ret = -EIO; - goto out; - } - - ret = w83697ug_init(); - if (ret != 0) - goto unreg_regions; - - ret = register_reboot_notifier(&wdt_notifier); - if (ret != 0) { - pr_err("cannot register reboot notifier (err=%d)\n", ret); - goto unreg_regions; - } - - ret = misc_register(&wdt_miscdev); - if (ret != 0) { - pr_err("cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - goto unreg_reboot; - } - - pr_info("initialized. timeout=%d sec (nowayout=%d)\n", - timeout, nowayout); - -out: - return ret; -unreg_reboot: - unregister_reboot_notifier(&wdt_notifier); -unreg_regions: - release_region(wdt_io, 1); - goto out; -} - -static void __exit wdt_exit(void) -{ - misc_deregister(&wdt_miscdev); - unregister_reboot_notifier(&wdt_notifier); - release_region(wdt_io, 1); -} - -module_init(wdt_init); -module_exit(wdt_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Flemming Frandsen <ff@nrvissing.net>"); -MODULE_DESCRIPTION("w83697ug/uf WDT driver"); |