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742 lines
17 KiB
742 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Industrial Computer Source PCI-WDT500/501 driver |
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* |
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* (c) Copyright 1996-1997 Alan Cox <[email protected]>, |
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* All Rights Reserved. |
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* |
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* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide |
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* warranty for any of this software. This material is provided |
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* "AS-IS" and at no charge. |
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* |
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* (c) Copyright 1995 Alan Cox <[email protected]> |
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* |
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* Release 0.10. |
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* |
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* Fixes |
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* Dave Gregorich : Modularisation and minor bugs |
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* Alan Cox : Added the watchdog ioctl() stuff |
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* Alan Cox : Fixed the reboot problem (as noted by |
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* Matt Crocker). |
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* Alan Cox : Added wdt= boot option |
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* Alan Cox : Cleaned up copy/user stuff |
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* Tim Hockin : Added insmod parameters, comment cleanup |
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* Parameterized timeout |
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* JP Nollmann : Added support for PCI wdt501p |
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* Alan Cox : Split ISA and PCI cards into two drivers |
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* Jeff Garzik : PCI cleanups |
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* Tigran Aivazian : Restructured wdtpci_init_one() to handle |
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* failures |
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* Joel Becker : Added WDIOC_GET/SETTIMEOUT |
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* Zwane Mwaikambo : Magic char closing, locking changes, |
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* cleanups |
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* Matt Domsch : nowayout module option |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/interrupt.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/types.h> |
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#include <linux/miscdevice.h> |
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#include <linux/watchdog.h> |
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#include <linux/ioport.h> |
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#include <linux/delay.h> |
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#include <linux/notifier.h> |
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#include <linux/reboot.h> |
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#include <linux/fs.h> |
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#include <linux/pci.h> |
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#include <linux/io.h> |
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#include <linux/uaccess.h> |
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#define WDT_IS_PCI |
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#include "wd501p.h" |
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/* We can only use 1 card due to the /dev/watchdog restriction */ |
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static int dev_count; |
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|
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static unsigned long open_lock; |
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static DEFINE_SPINLOCK(wdtpci_lock); |
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static char expect_close; |
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static resource_size_t io; |
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static int irq; |
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/* Default timeout */ |
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#define WD_TIMO 60 /* Default heartbeat = 60 seconds */ |
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static int heartbeat = WD_TIMO; |
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static int wd_heartbeat; |
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module_param(heartbeat, int, 0); |
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MODULE_PARM_DESC(heartbeat, |
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"Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" |
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__MODULE_STRING(WD_TIMO) ")"); |
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|
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static bool nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, bool, 0); |
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MODULE_PARM_DESC(nowayout, |
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"Watchdog cannot be stopped once started (default=" |
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
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|
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/* Support for the Fan Tachometer on the PCI-WDT501 */ |
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static int tachometer; |
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module_param(tachometer, int, 0); |
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MODULE_PARM_DESC(tachometer, |
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"PCI-WDT501 Fan Tachometer support (0=disable, default=0)"); |
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static int type = 500; |
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module_param(type, int, 0); |
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MODULE_PARM_DESC(type, |
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"PCI-WDT501 Card type (500 or 501 , default=500)"); |
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|
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/* |
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* Programming support |
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*/ |
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static void wdtpci_ctr_mode(int ctr, int mode) |
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{ |
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ctr <<= 6; |
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ctr |= 0x30; |
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ctr |= (mode << 1); |
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outb(ctr, WDT_CR); |
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udelay(8); |
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} |
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static void wdtpci_ctr_load(int ctr, int val) |
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{ |
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outb(val & 0xFF, WDT_COUNT0 + ctr); |
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udelay(8); |
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outb(val >> 8, WDT_COUNT0 + ctr); |
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udelay(8); |
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} |
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/** |
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* wdtpci_start: |
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* |
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* Start the watchdog driver. |
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*/ |
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static int wdtpci_start(void) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&wdtpci_lock, flags); |
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|
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/* |
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* "pet" the watchdog, as Access says. |
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* This resets the clock outputs. |
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*/ |
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inb(WDT_DC); /* Disable watchdog */ |
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udelay(8); |
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wdtpci_ctr_mode(2, 0); /* Program CTR2 for Mode 0: |
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Pulse on Terminal Count */ |
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outb(0, WDT_DC); /* Enable watchdog */ |
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udelay(8); |
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inb(WDT_DC); /* Disable watchdog */ |
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udelay(8); |
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outb(0, WDT_CLOCK); /* 2.0833MHz clock */ |
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udelay(8); |
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inb(WDT_BUZZER); /* disable */ |
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udelay(8); |
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inb(WDT_OPTONOTRST); /* disable */ |
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udelay(8); |
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inb(WDT_OPTORST); /* disable */ |
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udelay(8); |
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inb(WDT_PROGOUT); /* disable */ |
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udelay(8); |
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wdtpci_ctr_mode(0, 3); /* Program CTR0 for Mode 3: |
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Square Wave Generator */ |
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wdtpci_ctr_mode(1, 2); /* Program CTR1 for Mode 2: |
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Rate Generator */ |
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wdtpci_ctr_mode(2, 1); /* Program CTR2 for Mode 1: |
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Retriggerable One-Shot */ |
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wdtpci_ctr_load(0, 20833); /* count at 100Hz */ |
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wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */ |
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/* DO NOT LOAD CTR2 on PCI card! -- JPN */ |
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outb(0, WDT_DC); /* Enable watchdog */ |
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udelay(8); |
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spin_unlock_irqrestore(&wdtpci_lock, flags); |
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return 0; |
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} |
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/** |
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* wdtpci_stop: |
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* |
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* Stop the watchdog driver. |
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*/ |
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static int wdtpci_stop(void) |
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{ |
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unsigned long flags; |
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/* Turn the card off */ |
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spin_lock_irqsave(&wdtpci_lock, flags); |
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inb(WDT_DC); /* Disable watchdog */ |
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udelay(8); |
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wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */ |
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spin_unlock_irqrestore(&wdtpci_lock, flags); |
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return 0; |
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} |
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/** |
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* wdtpci_ping: |
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* |
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* Reload counter one with the watchdog heartbeat. We don't bother |
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* reloading the cascade counter. |
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*/ |
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static int wdtpci_ping(void) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&wdtpci_lock, flags); |
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/* Write a watchdog value */ |
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inb(WDT_DC); /* Disable watchdog */ |
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udelay(8); |
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wdtpci_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2: |
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Rate Generator */ |
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wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */ |
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outb(0, WDT_DC); /* Enable watchdog */ |
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udelay(8); |
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spin_unlock_irqrestore(&wdtpci_lock, flags); |
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return 0; |
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} |
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/** |
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* wdtpci_set_heartbeat: |
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* @t: the new heartbeat value that needs to be set. |
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* |
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* Set a new heartbeat value for the watchdog device. If the heartbeat |
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* value is incorrect we keep the old value and return -EINVAL. |
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* If successful we return 0. |
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*/ |
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static int wdtpci_set_heartbeat(int t) |
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{ |
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/* Arbitrary, can't find the card's limits */ |
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if (t < 1 || t > 65535) |
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return -EINVAL; |
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heartbeat = t; |
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wd_heartbeat = t * 100; |
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return 0; |
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} |
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/** |
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* wdtpci_get_status: |
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* @status: the new status. |
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* |
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* Extract the status information from a WDT watchdog device. There are |
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* several board variants so we have to know which bits are valid. Some |
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* bits default to one and some to zero in order to be maximally painful. |
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* |
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* we then map the bits onto the status ioctl flags. |
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*/ |
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static int wdtpci_get_status(int *status) |
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{ |
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unsigned char new_status; |
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unsigned long flags; |
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spin_lock_irqsave(&wdtpci_lock, flags); |
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new_status = inb(WDT_SR); |
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spin_unlock_irqrestore(&wdtpci_lock, flags); |
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*status = 0; |
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if (new_status & WDC_SR_ISOI0) |
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*status |= WDIOF_EXTERN1; |
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if (new_status & WDC_SR_ISII1) |
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*status |= WDIOF_EXTERN2; |
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if (type == 501) { |
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if (!(new_status & WDC_SR_TGOOD)) |
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*status |= WDIOF_OVERHEAT; |
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if (!(new_status & WDC_SR_PSUOVER)) |
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*status |= WDIOF_POWEROVER; |
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if (!(new_status & WDC_SR_PSUUNDR)) |
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*status |= WDIOF_POWERUNDER; |
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if (tachometer) { |
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if (!(new_status & WDC_SR_FANGOOD)) |
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*status |= WDIOF_FANFAULT; |
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} |
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} |
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return 0; |
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} |
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/** |
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* wdtpci_get_temperature: |
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* |
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* Reports the temperature in degrees Fahrenheit. The API is in |
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* farenheit. It was designed by an imperial measurement luddite. |
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*/ |
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static int wdtpci_get_temperature(int *temperature) |
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{ |
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unsigned short c; |
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unsigned long flags; |
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spin_lock_irqsave(&wdtpci_lock, flags); |
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c = inb(WDT_RT); |
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udelay(8); |
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spin_unlock_irqrestore(&wdtpci_lock, flags); |
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*temperature = (c * 11 / 15) + 7; |
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return 0; |
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} |
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/** |
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* wdtpci_interrupt: |
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* @irq: Interrupt number |
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* @dev_id: Unused as we don't allow multiple devices. |
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* |
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* Handle an interrupt from the board. These are raised when the status |
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* map changes in what the board considers an interesting way. That means |
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* a failure condition occurring. |
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*/ |
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static irqreturn_t wdtpci_interrupt(int irq, void *dev_id) |
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{ |
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/* |
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* Read the status register see what is up and |
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* then printk it. |
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*/ |
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unsigned char status; |
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spin_lock(&wdtpci_lock); |
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status = inb(WDT_SR); |
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udelay(8); |
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pr_crit("status %d\n", status); |
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if (type == 501) { |
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if (!(status & WDC_SR_TGOOD)) { |
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pr_crit("Overheat alarm (%d)\n", inb(WDT_RT)); |
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udelay(8); |
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} |
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if (!(status & WDC_SR_PSUOVER)) |
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pr_crit("PSU over voltage\n"); |
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if (!(status & WDC_SR_PSUUNDR)) |
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pr_crit("PSU under voltage\n"); |
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if (tachometer) { |
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if (!(status & WDC_SR_FANGOOD)) |
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pr_crit("Possible fan fault\n"); |
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} |
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} |
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if (!(status & WDC_SR_WCCR)) { |
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#ifdef SOFTWARE_REBOOT |
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#ifdef ONLY_TESTING |
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pr_crit("Would Reboot\n"); |
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#else |
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pr_crit("Initiating system reboot\n"); |
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emergency_restart(); |
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#endif |
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#else |
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pr_crit("Reset in 5ms\n"); |
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#endif |
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} |
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spin_unlock(&wdtpci_lock); |
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return IRQ_HANDLED; |
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} |
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/** |
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* wdtpci_write: |
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* @file: file handle to the watchdog |
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* @buf: buffer to write (unused as data does not matter here |
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* @count: count of bytes |
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* @ppos: pointer to the position to write. No seeks allowed |
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* |
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* A write to a watchdog device is defined as a keepalive signal. Any |
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* write of data will do, as we we don't define content meaning. |
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*/ |
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static ssize_t wdtpci_write(struct file *file, const char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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if (count) { |
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if (!nowayout) { |
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size_t i; |
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/* In case it was set long ago */ |
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expect_close = 0; |
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for (i = 0; i != count; i++) { |
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char c; |
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if (get_user(c, buf + i)) |
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return -EFAULT; |
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if (c == 'V') |
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expect_close = 42; |
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} |
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} |
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wdtpci_ping(); |
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} |
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return count; |
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} |
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/** |
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* wdtpci_ioctl: |
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* @file: file handle to the device |
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* @cmd: watchdog command |
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* @arg: argument pointer |
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* |
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* The watchdog API defines a common set of functions for all watchdogs |
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* according to their available features. We only actually usefully support |
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* querying capabilities and current status. |
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*/ |
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static long wdtpci_ioctl(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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void __user *argp = (void __user *)arg; |
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int __user *p = argp; |
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int new_heartbeat; |
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int status; |
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struct watchdog_info ident = { |
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.options = WDIOF_SETTIMEOUT| |
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WDIOF_MAGICCLOSE| |
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WDIOF_KEEPALIVEPING, |
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.firmware_version = 1, |
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.identity = "PCI-WDT500/501", |
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}; |
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/* Add options according to the card we have */ |
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ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); |
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if (type == 501) { |
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ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER| |
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WDIOF_POWEROVER); |
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if (tachometer) |
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ident.options |= WDIOF_FANFAULT; |
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} |
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switch (cmd) { |
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case WDIOC_GETSUPPORT: |
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return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; |
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case WDIOC_GETSTATUS: |
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wdtpci_get_status(&status); |
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return put_user(status, p); |
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case WDIOC_GETBOOTSTATUS: |
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return put_user(0, p); |
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case WDIOC_KEEPALIVE: |
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wdtpci_ping(); |
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return 0; |
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case WDIOC_SETTIMEOUT: |
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if (get_user(new_heartbeat, p)) |
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return -EFAULT; |
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if (wdtpci_set_heartbeat(new_heartbeat)) |
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return -EINVAL; |
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wdtpci_ping(); |
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fallthrough; |
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case WDIOC_GETTIMEOUT: |
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return put_user(heartbeat, p); |
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default: |
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return -ENOTTY; |
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} |
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} |
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/** |
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* wdtpci_open: |
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* @inode: inode of device |
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* @file: file handle to device |
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* |
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* The watchdog device has been opened. The watchdog device is single |
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* open and on opening we load the counters. Counter zero is a 100Hz |
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* cascade, into counter 1 which downcounts to reboot. When the counter |
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* triggers counter 2 downcounts the length of the reset pulse which |
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* set set to be as long as possible. |
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*/ |
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static int wdtpci_open(struct inode *inode, struct file *file) |
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{ |
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if (test_and_set_bit(0, &open_lock)) |
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return -EBUSY; |
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|
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if (nowayout) |
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__module_get(THIS_MODULE); |
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/* |
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* Activate |
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*/ |
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wdtpci_start(); |
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return stream_open(inode, file); |
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} |
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/** |
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* wdtpci_release: |
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* @inode: inode to board |
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* @file: file handle to board |
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* |
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* The watchdog has a configurable API. There is a religious dispute |
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* between people who want their watchdog to be able to shut down and |
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* those who want to be sure if the watchdog manager dies the machine |
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* reboots. In the former case we disable the counters, in the latter |
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* case you have to open it again very soon. |
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*/ |
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static int wdtpci_release(struct inode *inode, struct file *file) |
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{ |
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if (expect_close == 42) { |
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wdtpci_stop(); |
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} else { |
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pr_crit("Unexpected close, not stopping timer!\n"); |
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wdtpci_ping(); |
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} |
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expect_close = 0; |
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clear_bit(0, &open_lock); |
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return 0; |
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} |
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/** |
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* wdtpci_temp_read: |
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* @file: file handle to the watchdog board |
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* @buf: buffer to write 1 byte into |
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* @count: length of buffer |
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* @ptr: offset (no seek allowed) |
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* |
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* Read reports the temperature in degrees Fahrenheit. The API is in |
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* fahrenheit. It was designed by an imperial measurement luddite. |
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*/ |
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static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ptr) |
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{ |
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int temperature; |
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|
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if (wdtpci_get_temperature(&temperature)) |
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return -EFAULT; |
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|
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if (copy_to_user(buf, &temperature, 1)) |
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return -EFAULT; |
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|
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return 1; |
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} |
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/** |
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* wdtpci_temp_open: |
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* @inode: inode of device |
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* @file: file handle to device |
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* |
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* The temperature device has been opened. |
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*/ |
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|
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static int wdtpci_temp_open(struct inode *inode, struct file *file) |
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{ |
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return stream_open(inode, file); |
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} |
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|
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/** |
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* wdtpci_temp_release: |
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* @inode: inode to board |
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* @file: file handle to board |
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* |
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* The temperature device has been closed. |
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*/ |
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|
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static int wdtpci_temp_release(struct inode *inode, struct file *file) |
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{ |
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return 0; |
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} |
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|
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/** |
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* notify_sys: |
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* @this: our notifier block |
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* @code: the event being reported |
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* @unused: unused |
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* |
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* Our notifier is called on system shutdowns. We want to turn the card |
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* off at reboot otherwise the machine will reboot again during memory |
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* test or worse yet during the following fsck. This would suck, in fact |
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* trust me - if it happens it does suck. |
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*/ |
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|
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static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code, |
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void *unused) |
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{ |
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if (code == SYS_DOWN || code == SYS_HALT) |
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wdtpci_stop(); |
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return NOTIFY_DONE; |
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} |
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|
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/* |
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* Kernel Interfaces |
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*/ |
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|
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|
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static const struct file_operations wdtpci_fops = { |
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.owner = THIS_MODULE, |
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.llseek = no_llseek, |
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.write = wdtpci_write, |
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.unlocked_ioctl = wdtpci_ioctl, |
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.compat_ioctl = compat_ptr_ioctl, |
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.open = wdtpci_open, |
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.release = wdtpci_release, |
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}; |
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|
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static struct miscdevice wdtpci_miscdev = { |
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.minor = WATCHDOG_MINOR, |
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.name = "watchdog", |
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.fops = &wdtpci_fops, |
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}; |
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|
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static const struct file_operations wdtpci_temp_fops = { |
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.owner = THIS_MODULE, |
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.llseek = no_llseek, |
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.read = wdtpci_temp_read, |
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.open = wdtpci_temp_open, |
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.release = wdtpci_temp_release, |
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}; |
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|
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static struct miscdevice temp_miscdev = { |
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.minor = TEMP_MINOR, |
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.name = "temperature", |
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.fops = &wdtpci_temp_fops, |
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}; |
|
|
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/* |
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* The WDT card needs to learn about soft shutdowns in order to |
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* turn the timebomb registers off. |
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*/ |
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|
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static struct notifier_block wdtpci_notifier = { |
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.notifier_call = wdtpci_notify_sys, |
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}; |
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|
|
|
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static int wdtpci_init_one(struct pci_dev *dev, |
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const struct pci_device_id *ent) |
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{ |
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int ret = -EIO; |
|
|
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dev_count++; |
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if (dev_count > 1) { |
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pr_err("This driver only supports one device\n"); |
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return -ENODEV; |
|
} |
|
|
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if (type != 500 && type != 501) { |
|
pr_err("unknown card type '%d'\n", type); |
|
return -ENODEV; |
|
} |
|
|
|
if (pci_enable_device(dev)) { |
|
pr_err("Not possible to enable PCI Device\n"); |
|
return -ENODEV; |
|
} |
|
|
|
if (pci_resource_start(dev, 2) == 0x0000) { |
|
pr_err("No I/O-Address for card detected\n"); |
|
ret = -ENODEV; |
|
goto out_pci; |
|
} |
|
|
|
if (pci_request_region(dev, 2, "wdt_pci")) { |
|
pr_err("I/O address 0x%llx already in use\n", |
|
(unsigned long long)pci_resource_start(dev, 2)); |
|
goto out_pci; |
|
} |
|
|
|
irq = dev->irq; |
|
io = pci_resource_start(dev, 2); |
|
|
|
if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED, |
|
"wdt_pci", &wdtpci_miscdev)) { |
|
pr_err("IRQ %d is not free\n", irq); |
|
goto out_reg; |
|
} |
|
|
|
pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n", |
|
(unsigned long long)io, irq); |
|
|
|
/* Check that the heartbeat value is within its range; |
|
if not reset to the default */ |
|
if (wdtpci_set_heartbeat(heartbeat)) { |
|
wdtpci_set_heartbeat(WD_TIMO); |
|
pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n", |
|
WD_TIMO); |
|
} |
|
|
|
ret = register_reboot_notifier(&wdtpci_notifier); |
|
if (ret) { |
|
pr_err("cannot register reboot notifier (err=%d)\n", ret); |
|
goto out_irq; |
|
} |
|
|
|
if (type == 501) { |
|
ret = misc_register(&temp_miscdev); |
|
if (ret) { |
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
|
TEMP_MINOR, ret); |
|
goto out_rbt; |
|
} |
|
} |
|
|
|
ret = misc_register(&wdtpci_miscdev); |
|
if (ret) { |
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
|
WATCHDOG_MINOR, ret); |
|
goto out_misc; |
|
} |
|
|
|
pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", |
|
heartbeat, nowayout); |
|
if (type == 501) |
|
pr_info("Fan Tachometer is %s\n", |
|
tachometer ? "Enabled" : "Disabled"); |
|
|
|
ret = 0; |
|
out: |
|
return ret; |
|
|
|
out_misc: |
|
if (type == 501) |
|
misc_deregister(&temp_miscdev); |
|
out_rbt: |
|
unregister_reboot_notifier(&wdtpci_notifier); |
|
out_irq: |
|
free_irq(irq, &wdtpci_miscdev); |
|
out_reg: |
|
pci_release_region(dev, 2); |
|
out_pci: |
|
pci_disable_device(dev); |
|
goto out; |
|
} |
|
|
|
|
|
static void wdtpci_remove_one(struct pci_dev *pdev) |
|
{ |
|
/* here we assume only one device will ever have |
|
* been picked up and registered by probe function */ |
|
misc_deregister(&wdtpci_miscdev); |
|
if (type == 501) |
|
misc_deregister(&temp_miscdev); |
|
unregister_reboot_notifier(&wdtpci_notifier); |
|
free_irq(irq, &wdtpci_miscdev); |
|
pci_release_region(pdev, 2); |
|
pci_disable_device(pdev); |
|
dev_count--; |
|
} |
|
|
|
|
|
static const struct pci_device_id wdtpci_pci_tbl[] = { |
|
{ |
|
.vendor = PCI_VENDOR_ID_ACCESSIO, |
|
.device = PCI_DEVICE_ID_ACCESSIO_WDG_CSM, |
|
.subvendor = PCI_ANY_ID, |
|
.subdevice = PCI_ANY_ID, |
|
}, |
|
{ 0, }, /* terminate list */ |
|
}; |
|
MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl); |
|
|
|
|
|
static struct pci_driver wdtpci_driver = { |
|
.name = "wdt_pci", |
|
.id_table = wdtpci_pci_tbl, |
|
.probe = wdtpci_init_one, |
|
.remove = wdtpci_remove_one, |
|
}; |
|
|
|
module_pci_driver(wdtpci_driver); |
|
|
|
MODULE_AUTHOR("JP Nollmann, Alan Cox"); |
|
MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards"); |
|
MODULE_LICENSE("GPL");
|
|
|