/*
* NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x
*
- * This code is based on wdt.c with original copyright
+ * This code is based on wdt.c with original copyright.
*
- * (C) Copyright 2006 Marcus Junker, <junker@anduras.de>
- * and Sven Anders, <anders@anduras.de>
+ * (C) Copyright 2006 Sven Anders, <anders@anduras.de>
+ * and Marcus Junker, <junker@anduras.de>
*
* 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 Marcus Junker, Sven Anders nor ANDURAS AG
+ * Neither Sven Anders, Marcus Junker nor ANDURAS AG
* admit liability nor provide warranty for any of this software.
* This material is provided "AS-IS" and at no charge.
*
- * Release 1.00.
- *
+ * Release 1.1
*/
-
-/* #define DEBUG 1 */
-
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <asm/uaccess.h>
#include <asm/system.h>
-#define WATCHDOG_NAME "pc87413 WDT"
-#define PFX WATCHDOG_NAME ": "
-#define DPFX WATCHDOG_NAME " - DEBUG: "
-
-#define WDT_INDEX_IO_PORT (io+0) /* */
-#define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1)
-#define SWC_LDN 0x04
-#define SIOCFG2 0x22 /* Serial IO register */
-#define WDCTL 0x10 /* Watchdog-Timer-Controll-Register */
-#define WDTO 0x11 /* Watchdog timeout register */
-#define WDCFG 0x12 /* Watchdog config register */
-
-#define WD_TIMEOUT 1 /* minutes (1 ... 255) */
+/* #define DEBUG 1 */
+#define DEFAULT_TIMEOUT 1 /* 1 minute */
+#define MAX_TIMEOUT 255
-static int pc87413_is_open=0;
+#define VERSION "1.1"
+#define MODNAME "pc87413 WDT"
+#define PFX MODNAME ": "
+#define DPFX MODNAME " - DEBUG: "
-/*
- * You must set these - there is no sane way to probe for this board.
- * You can use pc87413=x to set these now.
- */
+#define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */
+#define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1)
+#define SWC_LDN 0x04
+#define SIOCFG2 0x22 /* Serial IO register */
+#define WDCTL 0x10 /* Watchdog-Timer-Controll-Register */
+#define WDTO 0x11 /* Watchdog timeout register */
+#define WDCFG 0x12 /* Watchdog config register */
+static int io = 0x2E; /* Address used on Portwell Boards */
+static int timeout = DEFAULT_TIMEOUT; /* timeout value */
+static unsigned long timer_enabled = 0; /* is the timer enabled? */
-/**
- * module_params
- *
- * Setup options. The board isn't really probe-able so we have to
- * get the user to tell us the configuration.
- */
+static char expect_close; /* is the close expected? */
-static int io=0x2E; /* Normally used addres on Portwell Boards */
-module_param(io, int, 0);
-MODULE_PARM_DESC(wdt_io, WATCHDOG_NAME " io port (default 0x2E)");
+static spinlock_t io_lock; /* to guard the watchdog from io races */
-static int timeout = WD_TIMEOUT; /* in minutes */
-module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes. 1<= timeout <=63, default=" __MODULE_STRING(WD_TIMEOUT) ".");
+static int nowayout = WATCHDOG_NOWAYOUT;
+/* -- Low level function ----------------------------------------*/
-/******************************************
- * Helper functions
- ******************************************/
+/* Select pins for Watchdog output */
-static void
-pc87413_select_wdt_out (void)
+static inline void pc87413_select_wdt_out (void)
{
+ unsigned int cr_data = 0;
- unsigned int cr_data=0;
-
- /* Select multiple pin,pin55,as WDT output */
+ /* Step 1: Select multiple pin,pin55,as WDT output */
outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
outb_p(cr_data, WDT_DATA_IO_PORT);
-
- #ifdef DEBUG
- printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", cr_data);
- #endif
+#ifdef DEBUG
+ printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output:"
+ " Bit7 to 1: %d\n", cr_data);
+#endif
}
-static void
-pc87413_enable_swc(void)
-{
+/* Enable SWC functions */
- unsigned int cr_data=0;
+static inline void pc87413_enable_swc(void)
+{
+ unsigned int cr_data=0;
/* Step 2: Enable SWC functions */
outb_p(SWC_LDN, WDT_DATA_IO_PORT);
outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */
- cr_data = inb (WDT_DATA_IO_PORT);
+ cr_data = inb(WDT_DATA_IO_PORT);
cr_data |= 0x01; /* Set Bit0 to 1 */
outb_p(0x30, WDT_INDEX_IO_PORT);
outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */
- #ifdef DEBUG
+#ifdef DEBUG
printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n");
- #endif
+#endif
}
-static unsigned int
-pc87413_get_swc_base(void)
+/* Read SWC I/O base address */
+
+static inline unsigned int pc87413_get_swc_base(void)
{
- unsigned int swc_base_addr = 0;
- unsigned char addr_l, addr_h = 0;
+ unsigned int swc_base_addr = 0;
+ unsigned char addr_l, addr_h = 0;
/* Step 3: Read SWC I/O Base Address */
outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */
- addr_h = inb (WDT_DATA_IO_PORT);
+ addr_h = inb(WDT_DATA_IO_PORT);
outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */
- addr_l = inb (WDT_DATA_IO_PORT);
-
+ addr_l = inb(WDT_DATA_IO_PORT);
swc_base_addr = (addr_h << 8) + addr_l;
- #ifdef DEBUG
- printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d, res %d\n", addr_l, addr_h, swc_base_addr);
- #endif
+#ifdef DEBUG
+ printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d,"
+ " res %d\n", addr_l, addr_h, swc_base_addr);
+#endif
return swc_base_addr;
}
-static void
-pc87413_swc_bank3(unsigned int swc_base_addr)
+/* Select Bank 3 of SWC */
+
+static inline void pc87413_swc_bank3(unsigned int swc_base_addr)
{
/* Step 4: Select Bank3 of SWC */
- outb_p (inb (swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f);
+ outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f);
- #ifdef DEBUG
+#ifdef DEBUG
printk(KERN_INFO DPFX "Select Bank3 of SWC\n");
- #endif
-
+#endif
}
-static void
-pc87413_programm_wdto (unsigned int swc_base_addr, char pc87413_time)
+/* Set watchdog timeout to x minutes */
+
+static inline void pc87413_programm_wdto(unsigned int swc_base_addr,
+ char pc87413_time)
{
/* Step 5: Programm WDTO, Twd. */
- outb_p (pc87413_time, swc_base_addr + WDTO);
+ outb_p(pc87413_time, swc_base_addr + WDTO);
- #ifdef DEBUG
+#ifdef DEBUG
printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time);
- #endif
+#endif
}
-static void
-pc87413_enable_wden (unsigned int swc_base_addr)
+/* Enable WDEN */
+
+static inline void pc87413_enable_wden(unsigned int swc_base_addr)
{
/* Step 6: Enable WDEN */
outb_p(inb (swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL);
- #ifdef DEBUG
+#ifdef DEBUG
printk(KERN_INFO DPFX "Enable WDEN\n");
- #endif
+#endif
}
-static void
-pc87413_enable_sw_wd_tren (unsigned int swc_base_addr)
+/* Enable SW_WD_TREN */
+static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr)
{
/* Enable SW_WD_TREN */
outb_p(inb (swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG);
- #ifdef DEBUG
+#ifdef DEBUG
printk(KERN_INFO DPFX "Enable SW_WD_TREN\n");
- #endif
+#endif
}
-static void
-pc87413_disable_sw_wd_tren (unsigned int swc_base_addr)
+/* Disable SW_WD_TREN */
+
+static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr)
{
/* Disable SW_WD_TREN */
outb_p(inb (swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG);
- #ifdef DEBUG
+#ifdef DEBUG
printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n");
- #endif
+#endif
}
+/* Enable SW_WD_TRG */
-static void
-pc87413_enable_sw_wd_trg (unsigned int swc_base_addr)
+static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr)
{
-
/* Enable SW_WD_TRG */
outb_p(inb (swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL);
- #ifdef DEBUG
+#ifdef DEBUG
printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n");
- #endif
+#endif
}
-static void
-pc87413_disable_sw_wd_trg (unsigned int swc_base_addr)
-{
+/* Disable SW_WD_TRG */
+static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr)
+{
/* Disable SW_WD_TRG */
outb_p(inb (swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);
- #ifdef DEBUG
+#ifdef DEBUG
printk(KERN_INFO DPFX "Disable SW_WD_TRG\n");
- #endif
+#endif
}
+/* -- Higher level functions ------------------------------------*/
+/* Enable the watchdog */
-static void
-pc87413_disable(void)
+static void pc87413_enable(void)
{
- unsigned int swc_base_addr;
+ unsigned int swc_base_addr;
+
+ spin_lock(&io_lock);
pc87413_select_wdt_out();
pc87413_enable_swc();
swc_base_addr = pc87413_get_swc_base();
pc87413_swc_bank3(swc_base_addr);
- pc87413_disable_sw_wd_tren(swc_base_addr);
- pc87413_disable_sw_wd_trg(swc_base_addr);
- pc87413_programm_wdto(swc_base_addr, 0);
+ pc87413_programm_wdto(swc_base_addr, timeout);
+ pc87413_enable_wden(swc_base_addr);
+ pc87413_enable_sw_wd_tren(swc_base_addr);
+ pc87413_enable_sw_wd_trg(swc_base_addr);
+
+ spin_unlock(&io_lock);
}
+/* Disable the watchdog */
-static void
-pc87413_refresh(char pc87413_time)
+static void pc87413_disable(void)
{
- unsigned int swc_base_addr;
+ unsigned int swc_base_addr;
+
+ spin_lock(&io_lock);
pc87413_select_wdt_out();
pc87413_enable_swc();
pc87413_swc_bank3(swc_base_addr);
pc87413_disable_sw_wd_tren(swc_base_addr);
pc87413_disable_sw_wd_trg(swc_base_addr);
- pc87413_programm_wdto(swc_base_addr, pc87413_time);
- pc87413_enable_wden(swc_base_addr);
- pc87413_enable_sw_wd_tren(swc_base_addr);
- pc87413_enable_sw_wd_trg(swc_base_addr);
+ pc87413_programm_wdto(swc_base_addr, 0);
+
+ spin_unlock(&io_lock);
}
+/* Refresh the watchdog */
-static void
-pc87413_enable(char pc87413_time)
+static void pc87413_refresh(void)
{
- unsigned int swc_base_addr;
+ unsigned int swc_base_addr;
+
+ spin_lock(&io_lock);
pc87413_select_wdt_out();
pc87413_enable_swc();
swc_base_addr = pc87413_get_swc_base();
pc87413_swc_bank3(swc_base_addr);
- pc87413_programm_wdto(swc_base_addr, pc87413_time);
+ pc87413_disable_sw_wd_tren(swc_base_addr);
+ pc87413_disable_sw_wd_trg(swc_base_addr);
+ pc87413_programm_wdto(swc_base_addr, timeout);
pc87413_enable_wden(swc_base_addr);
pc87413_enable_sw_wd_tren(swc_base_addr);
pc87413_enable_sw_wd_trg(swc_base_addr);
+ spin_unlock(&io_lock);
}
+/* -- File operations -------------------------------------------*/
+
+/**
+ * pc87413_open:
+ * @inode: inode of device
+ * @file: file handle to device
+ *
+ */
+
+static int pc87413_open(struct inode *inode, struct file *file)
+{
+ /* /dev/watchdog can only be opened once */
+
+ if (test_and_set_bit(0, &timer_enabled))
+ return -EBUSY;
+
+ if (nowayout)
+ __module_get(THIS_MODULE);
-/*******************************************
- * Kernel methods.
- *******************************************/
+ /* Reload and activate timer */
+ pc87413_refresh();
+ printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to"
+ " %d minute(s).\n", timeout);
+
+ return nonseekable_open(inode, file);
+}
/**
- * pc87413_status:
- *
- * Extract the status information from a WDT watchdog device. There are
- * several board variants so we have to know which bits are valid. Some
- * bits default to one and some to zero in order to be maximally painful.
+ * pc87413_release:
+ * @inode: inode to board
+ * @file: file handle to board
*
- * we then map the bits onto the status ioctl flags.
+ * The watchdog has a configurable API. There is a religious dispute
+ * between people who want their watchdog to be able to shut down and
+ * those who want to be sure if the watchdog manager dies the machine
+ * reboots. In the former case we disable the counters, in the latter
+ * case you have to open it again very soon.
*/
-static int pc87413_status(void)
+static int pc87413_release(struct inode *inode, struct file *file)
{
- /* Not supported */
+ /* Shut off the timer. */
+
+ if (expect_close == 42) {
+ pc87413_disable();
+ printk(KERN_INFO MODNAME "Watchdog disabled,"
+ " sleeping again...\n");
+ } else {
+ printk(KERN_CRIT MODNAME "Unexpected close, not stopping"
+ " watchdog!\n");
+ pc87413_refresh();
+ }
+
+ clear_bit(0, &timer_enabled);
+ expect_close = 0;
- return 1;
+ return 0;
}
-static long long pc87413_llseek(struct file *file, long long offset, int origin)
+/**
+ * pc87413_status:
+ *
+ * return, if the watchdog is enabled (timeout is set...)
+ */
+
+
+static int pc87413_status(void)
{
- return -ESPIPE;
+ return 1; /* currently not supported */
}
/**
* pc87413_write:
* @file: file handle to the watchdog
- * @buf: buffer to write (unused as data does not matter here
- * @count: count of bytes
+ * @data: data buffer to write
+ * @len: length in bytes
* @ppos: pointer to the position to write. No seeks allowed
*
* A write to a watchdog device is defined as a keepalive signal. Any
* write of data will do, as we we don't define content meaning.
*/
-static ssize_t
-pc87413_write (struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+static ssize_t pc87413_write(struct file *file, const char __user *data,
+ size_t len, loff_t *ppos)
{
- if (count) {
- pc87413_refresh (WD_TIMEOUT);
- #ifdef DEBUG
- printk(KERN_INFO DPFX "Write\n");
- #endif
+ /* See if we got the magic character 'V' and reload the timer */
+ if (len) {
+ if (!nowayout) {
+ size_t i;
+
+ /* reset expect flag */
+ expect_close = 0;
+
+ /* scan to see whether or not we got the magic character */
+ for (i = 0; i != len; i++) {
+ char c;
+ if (get_user(c, data+i))
+ return -EFAULT;
+ if (c == 'V')
+ expect_close = 42;
+ }
+ }
+
+ /* someone wrote to us, we should reload the timer */
+ pc87413_refresh();
}
- return count;
-}
-
-/*
- * Read reports the temperature in degrees Fahrenheit.
- */
-static ssize_t
-pc87413_read(struct file *file, char *buf, size_t count, loff_t *ptr)
-{
-
-// char timeout;
-//
-// outb_p(0x08, WDT_EFER); /* Select locical device 8 */
-// outb_p(0x0F6, WDT_EFER); /* Select CRF6 */
-// timeout = inb(WDT_EFDR); /* Read Timeout counter from CRF6 */
-
-
-// if(copy_to_user(buf,&timeout,1))
-// return -EFAULT;
- return 1;
-
-
+ return len;
}
- /**
+/**
* pc87413_ioctl:
* @inode: inode of the device
* @file: file handle to the device
* querying capabilities and current status.
*/
-static int
-pc87413_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
+static int pc87413_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
{
- static struct watchdog_info ident=
- {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
- .firmware_version = 1,
- .identity = "pc87413(HF/F)"
+ int new_timeout;
+
+ union {
+ struct watchdog_info __user *ident;
+ int __user *i;
+ } uarg;
+
+ static struct watchdog_info ident = {
+ .options = WDIOF_KEEPALIVEPING |
+ WDIOF_SETTIMEOUT |
+ WDIOF_MAGICCLOSE,
+ .firmware_version = 1,
+ .identity = "PC87413(HF/F) watchdog"
};
- ident.options=1; /* Mask down to the card we have */
+ uarg.i = (int __user *)arg;
- switch(cmd)
- {
+ switch(cmd) {
default:
- return -ENOIOCTLCMD;
+ return -ENOTTY;
+
case WDIOC_GETSUPPORT:
- return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
+ return copy_to_user(uarg.ident, &ident,
+ sizeof(ident)) ? -EFAULT : 0;
+
case WDIOC_GETSTATUS:
- return put_user(pc87413_status(),(int *)arg);
+ return put_user(pc87413_status(), uarg.i);
+
case WDIOC_GETBOOTSTATUS:
- return put_user(0, (int *)arg);
+ return put_user(0, uarg.i);
+
case WDIOC_KEEPALIVE:
- pc87413_refresh(WD_TIMEOUT);
- #ifdef DEBUG
- printk(KERN_INFO DPFX "keepalive\n");
- #endif
+ pc87413_refresh();
+#ifdef DEBUG
+ printk(KERN_INFO DPFX "keepalive\n");
+#endif
return 0;
- }
-}
-/**
- * pc87413_open:
- * @inode: inode of device
- * @file: file handle to device
- *
- * One of our two misc devices has been opened. The watchdog device is
- * single open and on opening we load the counters. Counter zero is a
- * 100Hz cascade, into counter 1 which downcounts to reboot. When the
- * counter triggers counter 2 downcounts the length of the reset pulse
- * which set set to be as long as possible.
- */
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_timeout, uarg.i))
+ return -EFAULT;
-static int
-pc87413_open(struct inode *inode, struct file *file)
-{
- switch(MINOR(inode->i_rdev))
- {
- case WATCHDOG_MINOR:
- if(pc87413_is_open)
- return -EBUSY;
- /*
- * Activate
- */
-
- pc87413_is_open=1;
- pc87413_refresh(WD_TIMEOUT);
- #ifdef DEBUG
- printk(KERN_INFO DPFX "Open\n");
- #endif
- return 0;
- case TEMP_MINOR:
- return 0;
- default:
- return -ENODEV;
- }
-}
+ // the API states this is given in secs
+ new_timeout /= 60;
-/**
- * pc87413_close:
- * @inode: inode to board
- * @file: file handle to board
- *
- * The watchdog has a configurable API. There is a religious dispute
- * between people who want their watchdog to be able to shut down and
- * those who want to be sure if the watchdog manager dies the machine
- * reboots. In the former case we disable the counters, in the latter
- * case you have to open it again very soon.
- */
+ if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
+ return -EINVAL;
-static int
-pc87413_release(struct inode *inode, struct file *file)
-{
- if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
- {
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- pc87413_disable();
-#endif
- pc87413_is_open=0;
- #ifdef DEBUG
- printk(KERN_INFO DPFX "Release\n");
- #endif
+ timeout = new_timeout;
+ pc87413_refresh();
+
+ // fall through and return the new timeout...
+
+ case WDIOC_GETTIMEOUT:
+
+ new_timeout = timeout * 60;
+
+ return put_user(new_timeout, uarg.i);
+
+ case WDIOC_SETOPTIONS:
+ {
+ int options, retval = -EINVAL;
+
+ if (get_user(options, uarg.i))
+ return -EFAULT;
+
+ if (options & WDIOS_DISABLECARD) {
+ pc87413_disable();
+ retval = 0;
+ }
+
+ if (options & WDIOS_ENABLECARD) {
+ pc87413_enable();
+ retval = 0;
+ }
+
+ return retval;
+ }
}
- return 0;
}
+/* -- Notifier funtions -----------------------------------------*/
+
/**
* notify_sys:
* @this: our notifier block
* trust me - if it happens it does suck.
*/
-static int
-pc87413_notify_sys(struct notifier_block *this, unsigned long code,
- void *unused)
+static int pc87413_notify_sys(struct notifier_block *this,
+ unsigned long code,
+ void *unused)
{
- if(code==SYS_DOWN || code==SYS_HALT)
+ if (code == SYS_DOWN || code == SYS_HALT)
{
/* Turn the card off */
pc87413_disable();
return NOTIFY_DONE;
}
-
-/*****************************************************
- * Kernel Interfaces
- *****************************************************/
-
+/* -- Module's structures ---------------------------------------*/
static struct file_operations pc87413_fops = {
.owner = THIS_MODULE,
- .llseek = pc87413_llseek,
- .read = pc87413_read,
+ .llseek = no_llseek,
.write = pc87413_write,
.ioctl = pc87413_ioctl,
.open = pc87413_open,
.release = pc87413_release,
};
-static struct miscdevice pc87413_miscdev=
+static struct notifier_block pc87413_notifier =
{
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &pc87413_fops
+ .notifier_call = pc87413_notify_sys,
};
-/*
- * The WDT card needs to learn about soft shutdowns in order to
- * turn the timebomb registers off.
- */
-
-static struct notifier_block pc87413_notifier=
+static struct miscdevice pc87413_miscdev=
{
- pc87413_notify_sys,
- NULL,
- 0
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &pc87413_fops
};
+/* -- Module init functions -------------------------------------*/
/**
- * pc87413_exit:
- *
- * Unload the watchdog. You cannot do this with any file handles open.
- * If your watchdog is set to continue ticking on close and you unload
- * it, well it keeps ticking. We won't get the interrupt but the board
- * will not touch PC memory so all is fine. You just have to load a new
- * module in 60 seconds or reboot.
- */
-
-static void
-pc87413_exit(void)
-{
- pc87413_disable();
- misc_deregister(&pc87413_miscdev);
- unregister_reboot_notifier(&pc87413_notifier);
- /* release_region(io,2); */
-}
-
-
-/**
- * pc87413_init:
+ * pc87413_init: module's "constructor"
*
* Set up the WDT watchdog board. All we have to do is grab the
* resources we require and bitch if anyone beat us to them.
* The open() function will actually kick the board off.
*/
-static int
-pc87413_init(void)
+static int __init pc87413_init(void)
{
int ret;
- printk(KERN_INFO PFX "Version 1.00 at io 0x%X\n", WDT_INDEX_IO_PORT);
+ spin_lock_init(&io_lock);
+ printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", WDT_INDEX_IO_PORT);
/* request_region(io, 2, "pc87413"); */
-
ret = register_reboot_notifier(&pc87413_notifier);
if (ret != 0) {
- printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
- ret);
+ printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+ ret);
}
-
-
ret = misc_register(&pc87413_miscdev);
if (ret != 0) {
- printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
+ printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, ret);
unregister_reboot_notifier(&pc87413_notifier);
return ret;
}
- printk (KERN_INFO PFX "initialized. timeout=%d min \n", timeout);
+ printk(KERN_INFO PFX "initialized. timeout=%d min \n", timeout);
-
- pc87413_enable(WD_TIMEOUT);
+ pc87413_enable();
return 0;
}
+/**
+ * pc87413_exit: module's "destructor"
+ *
+ * Unload the watchdog. You cannot do this with any file handles open.
+ * If your watchdog is set to continue ticking on close and you unload
+ * it, well it keeps ticking. We won't get the interrupt but the board
+ * will not touch PC memory so all is fine. You just have to load a new
+ * module in 60 seconds or reboot.
+ */
+
+static void __exit pc87413_exit(void)
+{
+ /* Stop the timer before we leave */
+ if (!nowayout)
+ {
+ pc87413_disable();
+ printk(KERN_INFO MODNAME "Watchdog disabled.\n");
+ }
+
+ misc_deregister(&pc87413_miscdev);
+ unregister_reboot_notifier(&pc87413_notifier);
+ /* release_region(io,2); */
+
+ printk(MODNAME " watchdog component driver removed.\n");
+}
module_init(pc87413_init);
module_exit(pc87413_exit);
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, Sven Anders <anders@anduras.de>");
+MODULE_AUTHOR("Sven Anders <anders@anduras.de>, Marcus Junker <junker@anduras.de>,");
MODULE_DESCRIPTION("PC87413 WDT driver");
+MODULE_LICENSE("GPL");
+
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+module_param(io, int, 0);
+MODULE_PARM_DESC(wdt_io, MODNAME " I/O port (default: " __MODULE_STRING(io) ").");
+
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes (default=" __MODULE_STRING(timeout) ").");
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff