Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 12 Oct 2001 04:46:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 12 Oct 2001 04:46:25 -0400 Received: from systemy5.systemy.it ([194.20.140.51]:63734 "EHLO morgana.systemy.it") by vger.kernel.org with ESMTP id ; Fri, 12 Oct 2001 04:46:11 -0400 Date: Fri, 12 Oct 2001 10:46:20 +0200 From: Rodolfo Giometti To: torvalds@transmeta.com Cc: linux-kernel@vger.kernel.org, Mauro Barella Subject: [PATCH] driver for eurotech PC104 on-board watchdog timer Message-ID: <20011012104620.A22799@morgana.systemy.it> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="a8Wt8u1KmwUX3Y2C" Content-Disposition: inline User-Agent: Mutt/1.2.5i Organization: Programmi e soluzioni GNU/Linux Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --a8Wt8u1KmwUX3Y2C Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hello, I developed this two simple drivers for the Eurotech PC104 on-board watchdog timer. One patch is for kernel 2.4.10 (but it applies to the 2.4.12 too) and one is for kernel 2.2.19. I hope you add these patchs to the Linux kernel source. Regards, Rodolfo Giometti -- \\\\ (o o) --oOO-(_)-OOo------------------------------------------------------------ Rodolfo Giometti (ZtW) e-mail: giometti@linux.it giometti@ascensit.com Programmi e soluzioni GNU giometti@oltrelinux.com * Linux Device Drivers home page: giometti.oltrelinux.com * Embedded Systems phone: +39 329 7028903 --a8Wt8u1KmwUX3Y2C Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="patch-2.4.10-eurotechwdt-1.0.0" diff -urN --exclude-from=patch-exclude linux-2.4.10/drivers/char/Config.in lp4_wd/drivers/char/Config.in --- linux-2.4.10/drivers/char/Config.in Sun Sep 23 18:52:38 2001 +++ lp4_wd/drivers/char/Config.in Tue Oct 9 23:00:46 2001 @@ -166,6 +166,7 @@ fi fi tristate ' ZF MachZ Watchdog' CONFIG_MACHZ_WDT + tristate ' Eurotech CPU-1220/1410 Watchdog Timer' CONFIG_EUROTECH_WDT fi endmenu diff -urN --exclude-from=patch-exclude linux-2.4.10/drivers/char/Makefile lp4_wd/drivers/char/Makefile --- linux-2.4.10/drivers/char/Makefile Sun Sep 9 19:43:02 2001 +++ lp4_wd/drivers/char/Makefile Tue Oct 9 23:00:43 2001 @@ -228,6 +228,7 @@ obj-$(CONFIG_977_WATCHDOG) += wdt977.o obj-$(CONFIG_I810_TCO) += i810-tco.o obj-$(CONFIG_MACHZ_WDT) += machzwd.o +obj-$(CONFIG_EUROTECH_WDT) += eurotechwdt.o obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o diff -urN --exclude-from=patch-exclude linux-2.4.10/drivers/char/eurotechwdt.c lp4_wd/drivers/char/eurotechwdt.c --- linux-2.4.10/drivers/char/eurotechwdt.c Thu Jan 1 01:00:00 1970 +++ lp4_wd/drivers/char/eurotechwdt.c Wed Oct 10 11:04:13 2001 @@ -0,0 +1,480 @@ +/* + * Eurotech CPU-1220/1410 on board WDT driver for Linux 2.4.x + * + * (c) Copyright 2001 Ascensit + * (c) Copyright 2001 Rodolfo Giometti + * + * Based on wdt.c. + * Original copyright messages: + * + * (c) Copyright 1996-1997 Alan Cox , 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 * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int eurwdt_is_open; +static int eurwdt_timeout; +static spinlock_t eurwdt_lock; + +/* + * You must set these - there is no sane way to probe for this board. + * You can use wdt=x,y to set these now. + */ + +static int io = 0x3f0; +static int irq = 10; +static char *ev = "int"; + +#define WDT_TIMEOUT 60 /* 1 minute */ + + +/* + * Some symbolic names + */ + +#define WDT_CTRL_REG 0x30 +#define WDT_OUTPIN_CFG 0xe2 + #define WDT_EVENT_INT 0x00 + #define WDT_EVENT_REBOOT 0x08 +#define WDT_UNIT_SEL 0xf1 + #define WDT_UNIT_SECS 0x80 +#define WDT_TIMEOUT_VAL 0xf2 +#define WDT_TIMER_CFG 0xf3 + + +#ifndef MODULE + +/** + * eurwdt_setup: + * @str: command line string + * + * Setup options. The board isn't really probe-able so we have to + * get the user to tell us the configuration. Sane people build it + * modular but the others come here. + */ + +static int __init eurwdt_setup(char *str) +{ + int ints[4]; + + str = get_options (str, ARRAY_SIZE(ints), ints); + + if (ints[0] > 0) { + io = ints[1]; + if (ints[0] > 1) + irq = ints[2]; + } + + return 1; +} + +__setup("wdt=", eurwdt_setup); + +#endif /* !MODULE */ + +MODULE_PARM(io, "i"); +MODULE_PARM_DESC(io, "Eurotech WDT io port (default=0x3f0)"); +MODULE_PARM(irq, "i"); +MODULE_PARM_DESC(irq, "Eurotech WDT irq (default=10)"); +MODULE_PARM(ev, "s"); +MODULE_PARM_DESC(ev, "Eurotech WDT event type (default is `reboot')"); + + +/* + * Programming support + */ + +static inline void eurwdt_write_reg(u8 index, u8 data) +{ + outb(index, io); + outb(data, io+1); +} + +static inline void eurwdt_lock_chip(void) +{ + outb(0xaa, io); +} + +static inline void eurwdt_unlock_chip(void) +{ + outb(0x55, io); + eurwdt_write_reg(0x07, 0x08); /* set the logical device */ +} + +static inline void eurwdt_set_timeout(int timeout) +{ + eurwdt_write_reg(WDT_TIMEOUT_VAL, (u8) timeout); +} + +static inline void eurwdt_disable_timer(void) +{ + eurwdt_set_timeout(0); +} + +static void eurwdt_activate_timer(void) +{ + eurwdt_disable_timer(); + eurwdt_write_reg(WDT_CTRL_REG, 0x01); /* activate the WDT */ + eurwdt_write_reg(WDT_OUTPIN_CFG, !strcmp("int", ev) ? + WDT_EVENT_INT : WDT_EVENT_REBOOT); + /* Setting interrupt line */ + if (irq == 2 || irq > 15 || irq < 0) { + printk(KERN_ERR ": invalid irq number\n"); + irq = 0; /* if invalid we disable interrupt */ + } + if (irq == 0) + printk(KERN_INFO ": interrupt disabled\n"); + eurwdt_write_reg(WDT_TIMER_CFG, irq<<4); + + eurwdt_write_reg(WDT_UNIT_SEL, WDT_UNIT_SECS); /* we use seconds */ + eurwdt_set_timeout(0); /* the default timeout */ +} + + +/* + * Kernel methods. + */ + +void eurwdt_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + printk(KERN_CRIT "timeout WDT timeout\n"); + +#ifdef ONLY_TESTING + printk(KERN_CRIT "Would Reboot.\n"); +#else + printk(KERN_CRIT "Initiating system reboot.\n"); + machine_restart(NULL); +#endif +} + + +/** + * eurwdt_ping: + * + * Reload counter one with the watchdog timeout. + */ + +static void eurwdt_ping(void) +{ + /* Write the watchdog default value */ + eurwdt_set_timeout(eurwdt_timeout); +} + +/** + * eurwdt_write: + * @file: file handle to the watchdog + * @buf: buffer to write (unused as data does not matter here + * @count: count of 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 eurwdt_write(struct file *file, const char *buf, size_t count, +loff_t *ppos) +{ + /* Can't seek (pwrite) on this device */ + if (ppos != &file->f_pos) + return -ESPIPE; + + if (count) { + eurwdt_ping(); /* the default timeout */ + return 1; + } + + return 0; +} + +/** + * eurwdt_ioctl: + * @inode: inode of the device + * @file: file handle to the device + * @cmd: watchdog command + * @arg: argument pointer + * + * The watchdog API defines a common set of functions for all watchdogs + * according to their available features. + */ + +static int eurwdt_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + static struct watchdog_info ident = { + options : WDIOF_CARDRESET, + firmware_version : 1, + identity : "WDT Eurotech CPU-1220/1410" + }; + + int time; + + switch(cmd) { + default: + return -ENOTTY; + + case WDIOC_GETSUPPORT: + return copy_to_user((struct watchdog_info *)arg, &ident, + sizeof(ident)) ? -EFAULT : 0; + + case WDIOC_GETBOOTSTATUS: + return put_user(0, (int *) arg); + + case WDIOC_KEEPALIVE: + eurwdt_ping(); + return 0; + + case WDIOC_SETTIMEOUT: + if (copy_from_user(&time, (int *) arg, sizeof(int))) + return -EFAULT; + + /* Sanity check */ + if (time < 0 || time > 255) + return -EINVAL; + + eurwdt_timeout = time; + eurwdt_set_timeout(time); + return 0; + } +} + +/** + * eurwdt_open: + * @inode: inode of device + * @file: file handle to device + * + * The misc device has been opened. The watchdog device is single + * open and on opening we load the counter. + */ + +static int eurwdt_open(struct inode *inode, struct file *file) +{ + switch (MINOR(inode->i_rdev)) { + case WATCHDOG_MINOR: + spin_lock(&eurwdt_lock); + if (eurwdt_is_open) { + spin_unlock(&eurwdt_lock); + return -EBUSY; + } + + eurwdt_is_open = 1; + eurwdt_timeout = WDT_TIMEOUT; /* initial timeout */ + + /* Activate the WDT */ + eurwdt_activate_timer(); + + spin_unlock(&eurwdt_lock); + + MOD_INC_USE_COUNT; + + return 0; + + case TEMP_MINOR: + return 0; + + default: + return -ENODEV; + } +} + +/** + * eurwdt_release: + * @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. + */ + +static int eurwdt_release(struct inode *inode, struct file *file) +{ + if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { +#ifndef CONFIG_WATCHDOG_NOWAYOUT + eurwdt_disable_timer(); +#endif + eurwdt_is_open = 0; + + MOD_DEC_USE_COUNT; + } + + return 0; +} + +/** + * eurwdt_notify_sys: + * @this: our notifier block + * @code: the event being reported + * @unused: unused + * + * Our notifier is called on system shutdowns. We want to turn the card + * off at reboot otherwise the machine will reboot again during memory + * test or worse yet during the following fsck. This would suck, in fact + * trust me - if it happens it does suck. + */ + +static int eurwdt_notify_sys(struct notifier_block *this, unsigned long code, + void *unused) +{ + if (code == SYS_DOWN || code == SYS_HALT) { + /* Turn the card off */ + eurwdt_disable_timer(); + } + + return NOTIFY_DONE; +} + +/* + * Kernel Interfaces + */ + + +static struct file_operations eurwdt_fops = { + owner: THIS_MODULE, + llseek: no_llseek, + write: eurwdt_write, + ioctl: eurwdt_ioctl, + open: eurwdt_open, + release: eurwdt_release, +}; + +static struct miscdevice eurwdt_miscdev = +{ + WATCHDOG_MINOR, + "watchdog", + &eurwdt_fops +}; + +/* + * The WDT card needs to learn about soft shutdowns in order to + * turn the timebomb registers off. + */ + +static struct notifier_block eurwdt_notifier = +{ + eurwdt_notify_sys, + NULL, + 0 +}; + +/** + * cleanup_module: + * + * 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 eurwdt_exit(void) +{ + eurwdt_lock_chip(); + + misc_deregister(&eurwdt_miscdev); + + unregister_reboot_notifier(&eurwdt_notifier); + release_region(io, 2); + free_irq(irq, NULL); +} + +/** + * eurwdt_init: + * + * Set up the WDT watchdog board. After grabbing the resources + * we require we need also to unlock the device. + * The open() function will actually kick the board off. + */ + +static int __init eurwdt_init(void) +{ + int ret; + + ret = misc_register(&eurwdt_miscdev); + if (ret) { + printk(KERN_ERR "eurwdt: can't misc_register on minor=%d\n", + WATCHDOG_MINOR); + goto out; + } + + ret = request_irq(irq, eurwdt_interrupt, SA_INTERRUPT, "eurwdt", NULL); + if(ret) { + printk(KERN_ERR "eurwdt: IRQ %d is not free.\n", irq); + goto outmisc; + } + + if (!request_region(io, 2, "eurwdt")) { + printk(KERN_ERR "eurwdt: IO %X is not free.\n", io); + ret = -EBUSY; + goto outirq; + } + + ret = register_reboot_notifier(&eurwdt_notifier); + if (ret) { + printk(KERN_ERR "eurwdt: can't register reboot notifier (err=%d)\n", ret); + goto outreg; + } + + eurwdt_unlock_chip(); + + ret = 0; + printk(KERN_INFO "Eurotech WDT driver 0.01 at %X (Interrupt %d)" + " - timeout event: %s\n", + io, irq, (!strcmp("int", ev) ? "int" : "reboot")); + + spin_lock_init(&eurwdt_lock); + + out: + return ret; + + outreg: + release_region(io, 2); + + outirq: + free_irq(irq, NULL); + + outmisc: + misc_deregister(&eurwdt_miscdev); + goto out; +} + +module_init(eurwdt_init); +module_exit(eurwdt_exit); + +MODULE_AUTHOR("Rodolfo Giometti"); +MODULE_DESCRIPTION("Driver for Eurotech CPU-1220/1410 on board watchdog"); +MODULE_LICENSE("GPL"); +EXPORT_NO_SYMBOLS; diff -urN --exclude-from=patch-exclude linux-2.4.10/include/linux/watchdog.h lp4_wd/include/linux/watchdog.h --- linux-2.4.10/include/linux/watchdog.h Thu Oct 4 13:50:34 2001 +++ lp4_wd/include/linux/watchdog.h Wed Oct 10 11:40:15 2001 @@ -25,6 +25,7 @@ #define WDIOC_GETTEMP _IOR(WATCHDOG_IOCTL_BASE, 3, int) #define WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, 4, int) #define WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, 5, int) +#define WDIOC_SETTIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 6, int) #define WDIOF_UNKNOWN -1 /* Unknown flag error */ #define WDIOS_UNKNOWN -1 /* Unknown status error */ --a8Wt8u1KmwUX3Y2C Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="patch-2.2.19-eurotechwdt-1.0.0" diff -urN --exclude-from=patch-exclude linux-2.2.19/drivers/char/Config.in lp2_wd/drivers/char/Config.in --- linux-2.2.19/drivers/char/Config.in Sun Mar 25 18:37:30 2001 +++ lp2_wd/drivers/char/Config.in Tue Oct 9 23:11:18 2001 @@ -114,6 +114,7 @@ fi fi tristate ' WDT PCI Watchdog timer' CONFIG_WDTPCI + tristate ' Eurotech CPU-1220/1410 Watchdog Timer' CONFIG_EUROTECH_WDT endmenu fi diff -urN --exclude-from=patch-exclude linux-2.2.19/drivers/char/Makefile lp2_wd/drivers/char/Makefile --- linux-2.2.19/drivers/char/Makefile Sun Mar 25 18:37:30 2001 +++ lp2_wd/drivers/char/Makefile Tue Oct 9 23:11:05 2001 @@ -317,6 +317,14 @@ endif endif +ifeq ($(CONFIG_EUROTECH_WDT),y) +O_OBJS += eurotechwdt.o +else + ifeq ($(CONFIG_EUROTECH_WDT),m) + M_OBJS += eurotechwdt.o + endif +endif + ifeq ($(CONFIG_MIXCOMWD),y) O_OBJS += mixcomwd.o else diff -urN --exclude-from=patch-exclude linux-2.2.19/drivers/char/eurotechwdt.c lp2_wd/drivers/char/eurotechwdt.c --- linux-2.2.19/drivers/char/eurotechwdt.c Thu Jan 1 01:00:00 1970 +++ lp2_wd/drivers/char/eurotechwdt.c Wed Oct 10 10:59:09 2001 @@ -0,0 +1,475 @@ +/* + * Eurotech CPU-1220/1410 on board WDT driver for Linux 2.2.x + * + * (c) Copyright 2001 Ascensit + * (c) Copyright 2001 Rodolfo Giometti + * + * Based on wdt.c. + * Original copyright messages: + * + * (c) Copyright 1996-1997 Alan Cox , 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 * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int eurwdt_is_open; +static int eurwdt_timeout; +static spinlock_t eurwdt_lock; + +/* + * You must set these - there is no sane way to probe for this board. + * You can use wdt=x,y to set these now. + */ + +static int io = 0x3f0; +static int irq = 10; +static char *ev = "int"; + +#define WDT_TIMEOUT 60 /* 1 minute */ + + +/* + * Some symbolic names + */ + +#define WDT_CTRL_REG 0x30 +#define WDT_OUTPIN_CFG 0xe2 + #define WDT_EVENT_INT 0x00 + #define WDT_EVENT_REBOOT 0x08 +#define WDT_UNIT_SEL 0xf1 + #define WDT_UNIT_SECS 0x80 +#define WDT_TIMEOUT_VAL 0xf2 +#define WDT_TIMER_CFG 0xf3 + + +#ifndef MODULE + +/** + * eurwdt_setup: + * @str: command line string + * + * Setup options. The board isn't really probe-able so we have to + * get the user to tell us the configuration. Sane people build it + * modular but the others come here. + */ + +static int __init eurwdt_setup(char *str) +{ + int ints[4]; + + str = get_options (str, ARRAY_SIZE(ints), ints); + + if (ints[0] > 0) { + io = ints[1]; + if (ints[0] > 1) + irq = ints[2]; + } + + return 1; +} + +__setup("wdt=", eurwdt_setup); + +#endif /* !MODULE */ + +MODULE_PARM(io, "i"); +MODULE_PARM_DESC(io, "Eurotech WDT io port (default=0x3f0)"); +MODULE_PARM(irq, "i"); +MODULE_PARM_DESC(irq, "Eurotech WDT irq (default=10)"); +MODULE_PARM(ev, "s"); +MODULE_PARM_DESC(ev, "Eurotech WDT event type (default is `reboot')"); + + +/* + * Programming support + */ + +static inline void eurwdt_write_reg(u8 index, u8 data) +{ + outb(index, io); + outb(data, io+1); +} + +static inline void eurwdt_lock_chip(void) +{ + outb(0xaa, io); +} + +static inline void eurwdt_unlock_chip(void) +{ + outb(0x55, io); + eurwdt_write_reg(0x07, 0x08); /* set the logical device */ +} + +static inline void eurwdt_set_timeout(int timeout) +{ + eurwdt_write_reg(WDT_TIMEOUT_VAL, (u8) timeout); +} + +static inline void eurwdt_disable_timer(void) +{ + eurwdt_set_timeout(0); +} + +static void eurwdt_activate_timer(void) +{ + eurwdt_disable_timer(); + eurwdt_write_reg(WDT_CTRL_REG, 0x01); /* activate the WDT */ + eurwdt_write_reg(WDT_OUTPIN_CFG, !strcmp("int", ev) ? + WDT_EVENT_INT : WDT_EVENT_REBOOT); + /* Setting interrupt line */ + if (irq == 2 || irq > 15 || irq < 0) { + printk(KERN_ERR ": invalid irq number\n"); + irq = 0; /* if invalid we disable interrupt */ + } + if (irq == 0) + printk(KERN_INFO ": interrupt disabled\n"); + eurwdt_write_reg(WDT_TIMER_CFG, irq<<4); + + eurwdt_write_reg(WDT_UNIT_SEL, WDT_UNIT_SECS); /* we use seconds */ + eurwdt_set_timeout(0); /* the default timeout */ +} + + +/* + * Kernel methods. + */ + +void eurwdt_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + printk(KERN_CRIT "timeout WDT timeout\n"); + +#ifdef ONLY_TESTING + printk(KERN_CRIT "Would Reboot.\n"); +#else + printk(KERN_CRIT "Initiating system reboot.\n"); + machine_restart(NULL); +#endif +} + + +/** + * eurwdt_ping: + * + * Reload counter one with the watchdog timeout. + */ + +static void eurwdt_ping(void) +{ + /* Write the watchdog default value */ + eurwdt_set_timeout(eurwdt_timeout); +} + +/** + * eurwdt_write: + * @file: file handle to the watchdog + * @buf: buffer to write (unused as data does not matter here + * @count: count of 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 eurwdt_write(struct file *file, const char *buf, size_t count, +loff_t *ppos) +{ + /* Can't seek (pwrite) on this device */ + if (ppos != &file->f_pos) + return -ESPIPE; + + if (count) { + eurwdt_ping(); /* the default timeout */ + return 1; + } + + return 0; +} + +/** + * eurwdt_ioctl: + * @inode: inode of the device + * @file: file handle to the device + * @cmd: watchdog command + * @arg: argument pointer + * + * The watchdog API defines a common set of functions for all watchdogs + * according to their available features. + */ + +static int eurwdt_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + static struct watchdog_info ident = { + options : WDIOF_CARDRESET, + firmware_version : 1, + identity : "WDT Eurotech CPU-1220/1410" + }; + + int time; + + switch(cmd) { + default: + return -ENOTTY; + + case WDIOC_GETSUPPORT: + return copy_to_user((struct watchdog_info *)arg, &ident, + sizeof(ident)) ? -EFAULT : 0; + + case WDIOC_GETBOOTSTATUS: + return put_user(0, (int *) arg); + + case WDIOC_KEEPALIVE: + eurwdt_ping(); + return 0; + + case WDIOC_SETTIMEOUT: + if (copy_from_user(&time, (int *) arg, sizeof(int))) + return -EFAULT; + + /* Sanity check */ + if (time < 0 || time > 255) + return -EINVAL; + + eurwdt_timeout = time; + eurwdt_set_timeout(time); + return 0; + } +} + +/** + * eurwdt_open: + * @inode: inode of device + * @file: file handle to device + * + * The misc device has been opened. The watchdog device is single + * open and on opening we load the counter. + */ + +static int eurwdt_open(struct inode *inode, struct file *file) +{ + switch (MINOR(inode->i_rdev)) { + case WATCHDOG_MINOR: + spin_lock(&eurwdt_lock); + if (eurwdt_is_open) { + spin_unlock(&eurwdt_lock); + return -EBUSY; + } + + eurwdt_is_open = 1; + eurwdt_timeout = WDT_TIMEOUT; /* initial timeout */ + + /* Activate the WDT */ + eurwdt_activate_timer(); + + spin_unlock(&eurwdt_lock); + + MOD_INC_USE_COUNT; + + return 0; + + case TEMP_MINOR: + return 0; + + default: + return -ENODEV; + } +} + +/** + * eurwdt_release: + * @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. + */ + +static int eurwdt_release(struct inode *inode, struct file *file) +{ + if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { +#ifndef CONFIG_WATCHDOG_NOWAYOUT + eurwdt_disable_timer(); +#endif + eurwdt_is_open = 0; + + MOD_DEC_USE_COUNT; + } + + return 0; +} + +/** + * eurwdt_notify_sys: + * @this: our notifier block + * @code: the event being reported + * @unused: unused + * + * Our notifier is called on system shutdowns. We want to turn the card + * off at reboot otherwise the machine will reboot again during memory + * test or worse yet during the following fsck. This would suck, in fact + * trust me - if it happens it does suck. + */ + +static int eurwdt_notify_sys(struct notifier_block *this, unsigned long code, + void *unused) +{ + if (code == SYS_DOWN || code == SYS_HALT) { + /* Turn the card off */ + eurwdt_disable_timer(); + } + + return NOTIFY_DONE; +} + +/* + * Kernel Interfaces + */ + + +static struct file_operations eurwdt_fops = { + write: eurwdt_write, + ioctl: eurwdt_ioctl, + open: eurwdt_open, + release: eurwdt_release, +}; + +static struct miscdevice eurwdt_miscdev = +{ + WATCHDOG_MINOR, + "watchdog", + &eurwdt_fops +}; + +/* + * The WDT card needs to learn about soft shutdowns in order to + * turn the timebomb registers off. + */ + +static struct notifier_block eurwdt_notifier = +{ + eurwdt_notify_sys, + NULL, + 0 +}; + +/** + * cleanup_module: + * + * 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. + */ + +#ifdef MODULE + +#define eurwdt_init init_module + +void cleanup_module(void) +{ + eurwdt_lock_chip(); + + misc_deregister(&eurwdt_miscdev); + + unregister_reboot_notifier(&eurwdt_notifier); + release_region(io, 2); + free_irq(irq, NULL); +} + +#endif + +/** + * eurwdt_init: + * + * Set up the WDT watchdog board. After grabbing the resources + * we require we need also to unlock the device. + * The open() function will actually kick the board off. + */ + +__initfunc(int eurwdt_init(void)) +{ + int ret; + + ret = misc_register(&eurwdt_miscdev); + if (ret) { + printk(KERN_ERR "eurwdt: can't misc_register on minor=%d\n", + WATCHDOG_MINOR); + goto out; + } + + ret = request_irq(irq, eurwdt_interrupt, SA_INTERRUPT, "eurwdt", NULL); + if(ret) { + printk(KERN_ERR "eurwdt: IRQ %d is not free.\n", irq); + goto outmisc; + } + + request_region(io, 2, "eurwdt"); + + ret = register_reboot_notifier(&eurwdt_notifier); + if (ret) { + printk(KERN_ERR "eurwdt: can't register reboot notifier (err=%d)\n", ret); + goto outreg; + } + + eurwdt_unlock_chip(); + + ret = 0; + printk(KERN_INFO "Eurotech WDT driver 0.01 at %X (Interrupt %d)" + " - timeout event: %s\n", + io, irq, (!strcmp("int", ev) ? "int" : "reboot")); + + spin_lock_init(&eurwdt_lock); + + out: + return ret; + + outreg: + release_region(io, 2); + free_irq(irq, NULL); + + outmisc: + misc_deregister(&eurwdt_miscdev); + goto out; +} + + +MODULE_AUTHOR("Rodolfo Giometti"); +MODULE_DESCRIPTION("Driver for Eurotech CPU-1220/1410 on board watchdog"); +EXPORT_NO_SYMBOLS; diff -urN --exclude-from=patch-exclude linux-2.2.19/include/linux/watchdog.h lp2_wd/include/linux/watchdog.h --- linux-2.2.19/include/linux/watchdog.h Sun Mar 25 18:37:40 2001 +++ lp2_wd/include/linux/watchdog.h Wed Oct 10 11:41:29 2001 @@ -25,6 +25,7 @@ #define WDIOC_GETTEMP _IOR(WATCHDOG_IOCTL_BASE, 3, int) #define WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, 4, int) #define WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, 5, int) +#define WDIOC_SETTIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 6, int) #define WDIOF_UNKNOWN -1 /* Unknown flag error */ #define WDIOS_UNKNOWN -1 /* Unknown status error */ --a8Wt8u1KmwUX3Y2C-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/