Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Wim Van Sebroeck | 1009 | 44.92% | 9 | 20.45% |
Linus Torvalds (pre-git) | 668 | 29.74% | 4 | 9.09% |
Alan Cox | 201 | 8.95% | 1 | 2.27% |
Dave Jones | 108 | 4.81% | 4 | 9.09% |
Joe Perches | 84 | 3.74% | 1 | 2.27% |
Arnaldo Carvalho de Melo | 57 | 2.54% | 1 | 2.27% |
Linus Torvalds | 27 | 1.20% | 4 | 9.09% |
Al Viro | 26 | 1.16% | 1 | 2.27% |
Art Haas | 20 | 0.89% | 1 | 2.27% |
Andrew Morton | 11 | 0.49% | 3 | 6.82% |
Randy Dunlap | 8 | 0.36% | 1 | 2.27% |
Jingoo Han | 6 | 0.27% | 1 | 2.27% |
Alexey Dobriyan | 4 | 0.18% | 1 | 2.27% |
Kirill Smelkov | 2 | 0.09% | 1 | 2.27% |
Guillaume Thouvenin | 2 | 0.09% | 1 | 2.27% |
Ilpo Järvinen | 2 | 0.09% | 1 | 2.27% |
Arjan van de Ven | 2 | 0.09% | 1 | 2.27% |
Guenter Roeck | 2 | 0.09% | 1 | 2.27% |
Eric W. Biedermann | 1 | 0.04% | 1 | 2.27% |
Shile Zhang | 1 | 0.04% | 1 | 2.27% |
H Hartley Sweeten | 1 | 0.04% | 1 | 2.27% |
Andrey Panin | 1 | 0.04% | 1 | 2.27% |
David Howells | 1 | 0.04% | 1 | 2.27% |
Thomas Gleixner | 1 | 0.04% | 1 | 2.27% |
Gustavo A. R. Silva | 1 | 0.04% | 1 | 2.27% |
Total | 2246 | 44 |
// SPDX-License-Identifier: GPL-2.0+ /* * Industrial Computer Source PCI-WDT500/501 driver * * (c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>, * All Rights Reserved. * * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide * warranty for any of this software. This material is provided * "AS-IS" and at no charge. * * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk> * * Release 0.10. * * Fixes * Dave Gregorich : Modularisation and minor bugs * Alan Cox : Added the watchdog ioctl() stuff * Alan Cox : Fixed the reboot problem (as noted by * Matt Crocker). * Alan Cox : Added wdt= boot option * Alan Cox : Cleaned up copy/user stuff * Tim Hockin : Added insmod parameters, comment cleanup * Parameterized timeout * JP Nollmann : Added support for PCI wdt501p * Alan Cox : Split ISA and PCI cards into two drivers * Jeff Garzik : PCI cleanups * Tigran Aivazian : Restructured wdtpci_init_one() to handle * failures * Joel Becker : Added WDIOC_GET/SETTIMEOUT * Zwane Mwaikambo : Magic char closing, locking changes, * cleanups * Matt Domsch : nowayout module option */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/interrupt.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/ioport.h> #include <linux/delay.h> #include <linux/notifier.h> #include <linux/reboot.h> #include <linux/fs.h> #include <linux/pci.h> #include <linux/io.h> #include <linux/uaccess.h> #define WDT_IS_PCI #include "wd501p.h" /* We can only use 1 card due to the /dev/watchdog restriction */ static int dev_count; static unsigned long open_lock; static DEFINE_SPINLOCK(wdtpci_lock); static char expect_close; static resource_size_t io; static int irq; /* Default timeout */ #define WD_TIMO 60 /* Default heartbeat = 60 seconds */ static int heartbeat = WD_TIMO; static int wd_heartbeat; module_param(heartbeat, int, 0); MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")"); static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); /* Support for the Fan Tachometer on the PCI-WDT501 */ static int tachometer; module_param(tachometer, int, 0); MODULE_PARM_DESC(tachometer, "PCI-WDT501 Fan Tachometer support (0=disable, default=0)"); static int type = 500; module_param(type, int, 0); MODULE_PARM_DESC(type, "PCI-WDT501 Card type (500 or 501 , default=500)"); /* * Programming support */ static void wdtpci_ctr_mode(int ctr, int mode) { ctr <<= 6; ctr |= 0x30; ctr |= (mode << 1); outb(ctr, WDT_CR); udelay(8); } static void wdtpci_ctr_load(int ctr, int val) { outb(val & 0xFF, WDT_COUNT0 + ctr); udelay(8); outb(val >> 8, WDT_COUNT0 + ctr); udelay(8); } /** * wdtpci_start: * * Start the watchdog driver. */ static int wdtpci_start(void) { unsigned long flags; spin_lock_irqsave(&wdtpci_lock, flags); /* * "pet" the watchdog, as Access says. * This resets the clock outputs. */ inb(WDT_DC); /* Disable watchdog */ udelay(8); wdtpci_ctr_mode(2, 0); /* Program CTR2 for Mode 0: Pulse on Terminal Count */ outb(0, WDT_DC); /* Enable watchdog */ udelay(8); inb(WDT_DC); /* Disable watchdog */ udelay(8); outb(0, WDT_CLOCK); /* 2.0833MHz clock */ udelay(8); inb(WDT_BUZZER); /* disable */ udelay(8); inb(WDT_OPTONOTRST); /* disable */ udelay(8); inb(WDT_OPTORST); /* disable */ udelay(8); inb(WDT_PROGOUT); /* disable */ udelay(8); wdtpci_ctr_mode(0, 3); /* Program CTR0 for Mode 3: Square Wave Generator */ wdtpci_ctr_mode(1, 2); /* Program CTR1 for Mode 2: Rate Generator */ wdtpci_ctr_mode(2, 1); /* Program CTR2 for Mode 1: Retriggerable One-Shot */ wdtpci_ctr_load(0, 20833); /* count at 100Hz */ wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */ /* DO NOT LOAD CTR2 on PCI card! -- JPN */ outb(0, WDT_DC); /* Enable watchdog */ udelay(8); spin_unlock_irqrestore(&wdtpci_lock, flags); return 0; } /** * wdtpci_stop: * * Stop the watchdog driver. */ static int wdtpci_stop(void) { unsigned long flags; /* Turn the card off */ spin_lock_irqsave(&wdtpci_lock, flags); inb(WDT_DC); /* Disable watchdog */ udelay(8); wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */ spin_unlock_irqrestore(&wdtpci_lock, flags); return 0; } /** * wdtpci_ping: * * Reload counter one with the watchdog heartbeat. We don't bother * reloading the cascade counter. */ static int wdtpci_ping(void) { unsigned long flags; spin_lock_irqsave(&wdtpci_lock, flags); /* Write a watchdog value */ inb(WDT_DC); /* Disable watchdog */ udelay(8); wdtpci_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2: Rate Generator */ wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */ outb(0, WDT_DC); /* Enable watchdog */ udelay(8); spin_unlock_irqrestore(&wdtpci_lock, flags); return 0; } /** * wdtpci_set_heartbeat: * @t: the new heartbeat value that needs to be set. * * Set a new heartbeat value for the watchdog device. If the heartbeat * value is incorrect we keep the old value and return -EINVAL. * If successful we return 0. */ static int wdtpci_set_heartbeat(int t) { /* Arbitrary, can't find the card's limits */ if (t < 1 || t > 65535) return -EINVAL; heartbeat = t; wd_heartbeat = t * 100; return 0; } /** * wdtpci_get_status: * @status: the new 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. * * we then map the bits onto the status ioctl flags. */ static int wdtpci_get_status(int *status) { unsigned char new_status; unsigned long flags; spin_lock_irqsave(&wdtpci_lock, flags); new_status = inb(WDT_SR); spin_unlock_irqrestore(&wdtpci_lock, flags); *status = 0; if (new_status & WDC_SR_ISOI0) *status |= WDIOF_EXTERN1; if (new_status & WDC_SR_ISII1) *status |= WDIOF_EXTERN2; if (type == 501) { if (!(new_status & WDC_SR_TGOOD)) *status |= WDIOF_OVERHEAT; if (!(new_status & WDC_SR_PSUOVER)) *status |= WDIOF_POWEROVER; if (!(new_status & WDC_SR_PSUUNDR)) *status |= WDIOF_POWERUNDER; if (tachometer) { if (!(new_status & WDC_SR_FANGOOD)) *status |= WDIOF_FANFAULT; } } return 0; } /** * wdtpci_get_temperature: * * Reports the temperature in degrees Fahrenheit. The API is in * farenheit. It was designed by an imperial measurement luddite. */ static int wdtpci_get_temperature(int *temperature) { unsigned short c; unsigned long flags; spin_lock_irqsave(&wdtpci_lock, flags); c = inb(WDT_RT); udelay(8); spin_unlock_irqrestore(&wdtpci_lock, flags); *temperature = (c * 11 / 15) + 7; return 0; } /** * wdtpci_interrupt: * @irq: Interrupt number * @dev_id: Unused as we don't allow multiple devices. * * Handle an interrupt from the board. These are raised when the status * map changes in what the board considers an interesting way. That means * a failure condition occurring. */ static irqreturn_t wdtpci_interrupt(int irq, void *dev_id) { /* * Read the status register see what is up and * then printk it. */ unsigned char status; spin_lock(&wdtpci_lock); status = inb(WDT_SR); udelay(8); pr_crit("status %d\n", status); if (type == 501) { if (!(status & WDC_SR_TGOOD)) { pr_crit("Overheat alarm (%d)\n", inb(WDT_RT)); udelay(8); } if (!(status & WDC_SR_PSUOVER)) pr_crit("PSU over voltage\n"); if (!(status & WDC_SR_PSUUNDR)) pr_crit("PSU under voltage\n"); if (tachometer) { if (!(status & WDC_SR_FANGOOD)) pr_crit("Possible fan fault\n"); } } if (!(status & WDC_SR_WCCR)) { #ifdef SOFTWARE_REBOOT #ifdef ONLY_TESTING pr_crit("Would Reboot\n"); #else pr_crit("Initiating system reboot\n"); emergency_restart(); #endif #else pr_crit("Reset in 5ms\n"); #endif } spin_unlock(&wdtpci_lock); return IRQ_HANDLED; } /** * wdtpci_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 wdtpci_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { if (count) { if (!nowayout) { size_t i; /* In case it was set long ago */ expect_close = 0; for (i = 0; i != count; i++) { char c; if (get_user(c, buf + i)) return -EFAULT; if (c == 'V') expect_close = 42; } } wdtpci_ping(); } return count; } /** * wdtpci_ioctl: * @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. We only actually usefully support * querying capabilities and current status. */ static long wdtpci_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; int new_heartbeat; int status; struct watchdog_info ident = { .options = WDIOF_SETTIMEOUT| WDIOF_MAGICCLOSE| WDIOF_KEEPALIVEPING, .firmware_version = 1, .identity = "PCI-WDT500/501", }; /* Add options according to the card we have */ ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); if (type == 501) { ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER| WDIOF_POWEROVER); if (tachometer) ident.options |= WDIOF_FANFAULT; } switch (cmd) { case WDIOC_GETSUPPORT: return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; case WDIOC_GETSTATUS: wdtpci_get_status(&status); return put_user(status, p); case WDIOC_GETBOOTSTATUS: return put_user(0, p); case WDIOC_KEEPALIVE: wdtpci_ping(); return 0; case WDIOC_SETTIMEOUT: if (get_user(new_heartbeat, p)) return -EFAULT; if (wdtpci_set_heartbeat(new_heartbeat)) return -EINVAL; wdtpci_ping(); /* fall through */ case WDIOC_GETTIMEOUT: return put_user(heartbeat, p); default: return -ENOTTY; } } /** * wdtpci_open: * @inode: inode of device * @file: file handle to device * * The watchdog device 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. */ static int wdtpci_open(struct inode *inode, struct file *file) { if (test_and_set_bit(0, &open_lock)) return -EBUSY; if (nowayout) __module_get(THIS_MODULE); /* * Activate */ wdtpci_start(); return stream_open(inode, file); } /** * wdtpci_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 wdtpci_release(struct inode *inode, struct file *file) { if (expect_close == 42) { wdtpci_stop(); } else { pr_crit("Unexpected close, not stopping timer!\n"); wdtpci_ping(); } expect_close = 0; clear_bit(0, &open_lock); return 0; } /** * wdtpci_temp_read: * @file: file handle to the watchdog board * @buf: buffer to write 1 byte into * @count: length of buffer * @ptr: offset (no seek allowed) * * Read reports the temperature in degrees Fahrenheit. The API is in * fahrenheit. It was designed by an imperial measurement luddite. */ static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr) { int temperature; if (wdtpci_get_temperature(&temperature)) return -EFAULT; if (copy_to_user(buf, &temperature, 1)) return -EFAULT; return 1; } /** * wdtpci_temp_open: * @inode: inode of device * @file: file handle to device * * The temperature device has been opened. */ static int wdtpci_temp_open(struct inode *inode, struct file *file) { return stream_open(inode, file); } /** * wdtpci_temp_release: * @inode: inode to board * @file: file handle to board * * The temperature device has been closed. */ static int wdtpci_temp_release(struct inode *inode, struct file *file) { return 0; } /** * 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 wdtpci_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { if (code == SYS_DOWN || code == SYS_HALT) wdtpci_stop(); return NOTIFY_DONE; } /* * Kernel Interfaces */ static const struct file_operations wdtpci_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = wdtpci_write, .unlocked_ioctl = wdtpci_ioctl, .open = wdtpci_open, .release = wdtpci_release, }; static struct miscdevice wdtpci_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &wdtpci_fops, }; static const struct file_operations wdtpci_temp_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .read = wdtpci_temp_read, .open = wdtpci_temp_open, .release = wdtpci_temp_release, }; static struct miscdevice temp_miscdev = { .minor = TEMP_MINOR, .name = "temperature", .fops = &wdtpci_temp_fops, }; /* * The WDT card needs to learn about soft shutdowns in order to * turn the timebomb registers off. */ static struct notifier_block wdtpci_notifier = { .notifier_call = wdtpci_notify_sys, }; static int wdtpci_init_one(struct pci_dev *dev, const struct pci_device_id *ent) { int ret = -EIO; dev_count++; if (dev_count > 1) { pr_err("This driver only supports one device\n"); return -ENODEV; } 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");
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