^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Industrial Computer Source WDT501 driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * (c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * warranty for any of this software. This material is provided
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * "AS-IS" and at no charge.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Release 0.10.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Fixes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Dave Gregorich : Modularisation and minor bugs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Alan Cox : Added the watchdog ioctl() stuff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Alan Cox : Fixed the reboot problem (as noted by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Matt Crocker).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Alan Cox : Added wdt= boot option
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Alan Cox : Cleaned up copy/user stuff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * Tim Hockin : Added insmod parameters, comment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * cleanup, parameterized timeout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * Tigran Aivazian : Restructured wdt_init() to handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * failures
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Joel Becker : Added WDIOC_GET/SETTIMEOUT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Matt Domsch : Added nowayout module option
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include "wd501p.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static unsigned long wdt_is_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static char expect_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * Module parameters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #define WD_TIMO 60 /* Default heartbeat = 60 seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static int heartbeat = WD_TIMO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static int wd_heartbeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) module_param(heartbeat, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) MODULE_PARM_DESC(heartbeat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) "Watchdog heartbeat in seconds. (0 < heartbeat < 65536, default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) __MODULE_STRING(WD_TIMO) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) MODULE_PARM_DESC(nowayout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* You must set these - there is no sane way to probe for this board. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static int io = 0x240;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static int irq = 11;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static DEFINE_SPINLOCK(wdt_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) module_param_hw(io, int, ioport, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) MODULE_PARM_DESC(io, "WDT io port (default=0x240)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) module_param_hw(irq, int, irq, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) MODULE_PARM_DESC(irq, "WDT irq (default=11)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /* Support for the Fan Tachometer on the WDT501-P */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static int tachometer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) module_param(tachometer, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) MODULE_PARM_DESC(tachometer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) "WDT501-P Fan Tachometer support (0=disable, default=0)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static int type = 500;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) module_param(type, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) MODULE_PARM_DESC(type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) "WDT501-P Card type (500 or 501, default=500)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * Programming support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static void wdt_ctr_mode(int ctr, int mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) ctr <<= 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) ctr |= 0x30;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) ctr |= (mode << 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) outb_p(ctr, WDT_CR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static void wdt_ctr_load(int ctr, int val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) outb_p(val&0xFF, WDT_COUNT0+ctr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) outb_p(val>>8, WDT_COUNT0+ctr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * wdt_start:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * Start the watchdog driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static int wdt_start(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) spin_lock_irqsave(&wdt_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) inb_p(WDT_DC); /* Disable watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) wdt_ctr_mode(0, 3); /* Program CTR0 for Mode 3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) Square Wave Generator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) wdt_ctr_mode(1, 2); /* Program CTR1 for Mode 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) Rate Generator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) wdt_ctr_mode(2, 0); /* Program CTR2 for Mode 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) Pulse on Terminal Count */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) wdt_ctr_load(0, 8948); /* Count at 100Hz */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) wdt_ctr_load(1, wd_heartbeat); /* Heartbeat */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) wdt_ctr_load(2, 65535); /* Length of reset pulse */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) outb_p(0, WDT_DC); /* Enable watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) spin_unlock_irqrestore(&wdt_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * wdt_stop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * Stop the watchdog driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static int wdt_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) spin_lock_irqsave(&wdt_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /* Turn the card off */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) inb_p(WDT_DC); /* Disable watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) wdt_ctr_load(2, 0); /* 0 length reset pulses now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) spin_unlock_irqrestore(&wdt_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * wdt_ping:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * Reload counter one with the watchdog heartbeat. We don't bother
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * reloading the cascade counter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static void wdt_ping(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) spin_lock_irqsave(&wdt_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /* Write a watchdog value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) inb_p(WDT_DC); /* Disable watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) wdt_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) Rate Generator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) wdt_ctr_load(1, wd_heartbeat); /* Heartbeat */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) outb_p(0, WDT_DC); /* Enable watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) spin_unlock_irqrestore(&wdt_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * wdt_set_heartbeat:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * @t: the new heartbeat value that needs to be set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * Set a new heartbeat value for the watchdog device. If the heartbeat
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * value is incorrect we keep the old value and return -EINVAL. If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * successful we return 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static int wdt_set_heartbeat(int t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (t < 1 || t > 65535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) heartbeat = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) wd_heartbeat = t * 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * wdt_get_status:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * Extract the status information from a WDT watchdog device. There are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * several board variants so we have to know which bits are valid. Some
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) * bits default to one and some to zero in order to be maximally painful.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * we then map the bits onto the status ioctl flags.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static int wdt_get_status(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) unsigned char new_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) int status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) spin_lock_irqsave(&wdt_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) new_status = inb_p(WDT_SR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) spin_unlock_irqrestore(&wdt_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) if (new_status & WDC_SR_ISOI0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) status |= WDIOF_EXTERN1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) if (new_status & WDC_SR_ISII1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) status |= WDIOF_EXTERN2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (type == 501) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (!(new_status & WDC_SR_TGOOD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) status |= WDIOF_OVERHEAT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (!(new_status & WDC_SR_PSUOVER))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) status |= WDIOF_POWEROVER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (!(new_status & WDC_SR_PSUUNDR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) status |= WDIOF_POWERUNDER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (tachometer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (!(new_status & WDC_SR_FANGOOD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) status |= WDIOF_FANFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * wdt_get_temperature:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * Reports the temperature in degrees Fahrenheit. The API is in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) * farenheit. It was designed by an imperial measurement luddite.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static int wdt_get_temperature(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) unsigned short c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) spin_lock_irqsave(&wdt_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) c = inb_p(WDT_RT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) spin_unlock_irqrestore(&wdt_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return (c * 11 / 15) + 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static void wdt_decode_501(int status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (!(status & WDC_SR_TGOOD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) pr_crit("Overheat alarm (%d)\n", inb_p(WDT_RT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (!(status & WDC_SR_PSUOVER))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) pr_crit("PSU over voltage\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (!(status & WDC_SR_PSUUNDR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) pr_crit("PSU under voltage\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * wdt_interrupt:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * @irq: Interrupt number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * @dev_id: Unused as we don't allow multiple devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * Handle an interrupt from the board. These are raised when the status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * map changes in what the board considers an interesting way. That means
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) * a failure condition occurring.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static irqreturn_t wdt_interrupt(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * Read the status register see what is up and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * then printk it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) unsigned char status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) spin_lock(&wdt_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) status = inb_p(WDT_SR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) pr_crit("WDT status %d\n", status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (type == 501) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) wdt_decode_501(status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) if (tachometer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (!(status & WDC_SR_FANGOOD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) pr_crit("Possible fan fault\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (!(status & WDC_SR_WCCR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) #ifdef SOFTWARE_REBOOT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) #ifdef ONLY_TESTING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) pr_crit("Would Reboot\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) pr_crit("Initiating system reboot\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) emergency_restart();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) pr_crit("Reset in 5ms\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) spin_unlock(&wdt_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * wdt_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * @file: file handle to the watchdog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * @buf: buffer to write (unused as data does not matter here
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * @count: count of bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * @ppos: pointer to the position to write. No seeks allowed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * A write to a watchdog device is defined as a keepalive signal. Any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * write of data will do, as we we don't define content meaning.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static ssize_t wdt_write(struct file *file, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) /* In case it was set long ago */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) for (i = 0; i != count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (get_user(c, buf + i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) if (c == 'V')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) expect_close = 42;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) wdt_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * wdt_ioctl:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * @file: file handle to the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * @cmd: watchdog command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * @arg: argument pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * The watchdog API defines a common set of functions for all watchdogs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) * according to their available features. We only actually usefully support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * querying capabilities and current status.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) int __user *p = argp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) int new_heartbeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) struct watchdog_info ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) .options = WDIOF_SETTIMEOUT|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) WDIOF_MAGICCLOSE|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) WDIOF_KEEPALIVEPING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) .firmware_version = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) .identity = "WDT500/501",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) /* Add options according to the card we have */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (type == 501) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) WDIOF_POWEROVER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) if (tachometer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) ident.options |= WDIOF_FANFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) status = wdt_get_status();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) return put_user(status, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) case WDIOC_GETBOOTSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) return put_user(0, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) wdt_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) case WDIOC_SETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) if (get_user(new_heartbeat, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (wdt_set_heartbeat(new_heartbeat))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) wdt_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) case WDIOC_GETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) return put_user(heartbeat, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) * wdt_open:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) * @inode: inode of device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) * @file: file handle to device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) * The watchdog device has been opened. The watchdog device is single
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * open and on opening we load the counters. Counter zero is a 100Hz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) * cascade, into counter 1 which downcounts to reboot. When the counter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) * triggers counter 2 downcounts the length of the reset pulse which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) * set set to be as long as possible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) static int wdt_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) if (test_and_set_bit(0, &wdt_is_open))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * Activate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) * wdt_release:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) * @inode: inode to board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) * @file: file handle to board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * The watchdog has a configurable API. There is a religious dispute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * between people who want their watchdog to be able to shut down and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * those who want to be sure if the watchdog manager dies the machine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) * reboots. In the former case we disable the counters, in the latter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) * case you have to open it again very soon.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) static int wdt_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (expect_close == 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) wdt_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) clear_bit(0, &wdt_is_open);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) pr_crit("WDT device closed unexpectedly. WDT will not stop!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) wdt_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) * wdt_temp_read:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) * @file: file handle to the watchdog board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) * @buf: buffer to write 1 byte into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * @count: length of buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * @ptr: offset (no seek allowed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * Temp_read reports the temperature in degrees Fahrenheit. The API is in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * farenheit. It was designed by an imperial measurement luddite.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) static ssize_t wdt_temp_read(struct file *file, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) size_t count, loff_t *ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) int temperature = wdt_get_temperature();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (copy_to_user(buf, &temperature, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) * wdt_temp_open:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) * @inode: inode of device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) * @file: file handle to device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) * The temperature device has been opened.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) static int wdt_temp_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * wdt_temp_release:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * @inode: inode to board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) * @file: file handle to board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * The temperature device has been closed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) static int wdt_temp_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * notify_sys:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * @this: our notifier block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) * @code: the event being reported
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * @unused: unused
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) * Our notifier is called on system shutdowns. We want to turn the card
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) * off at reboot otherwise the machine will reboot again during memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * test or worse yet during the following fsck. This would suck, in fact
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) * trust me - if it happens it does suck.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (code == SYS_DOWN || code == SYS_HALT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) wdt_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * Kernel Interfaces
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) static const struct file_operations wdt_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) .write = wdt_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) .unlocked_ioctl = wdt_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) .open = wdt_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) .release = wdt_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) static struct miscdevice wdt_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) .minor = WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) .name = "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) .fops = &wdt_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) static const struct file_operations wdt_temp_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) .read = wdt_temp_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) .open = wdt_temp_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) .release = wdt_temp_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) static struct miscdevice temp_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) .minor = TEMP_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) .name = "temperature",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) .fops = &wdt_temp_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) * The WDT card needs to learn about soft shutdowns in order to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) * turn the timebomb registers off.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) static struct notifier_block wdt_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) .notifier_call = wdt_notify_sys,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) * cleanup_module:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) * Unload the watchdog. You cannot do this with any file handles open.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) * If your watchdog is set to continue ticking on close and you unload
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) * it, well it keeps ticking. We won't get the interrupt but the board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) * will not touch PC memory so all is fine. You just have to load a new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) * module in 60 seconds or reboot.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) static void __exit wdt_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) misc_deregister(&wdt_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) if (type == 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) misc_deregister(&temp_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) unregister_reboot_notifier(&wdt_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) free_irq(irq, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) release_region(io, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) * wdt_init:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) * Set up the WDT watchdog board. All we have to do is grab the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) * resources we require and bitch if anyone beat us to them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) * The open() function will actually kick the board off.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) static int __init wdt_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) if (type != 500 && type != 501) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) pr_err("unknown card type '%d'\n", type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) /* Check that the heartbeat value is within it's range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) if not reset to the default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) if (wdt_set_heartbeat(heartbeat)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) wdt_set_heartbeat(WD_TIMO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) WD_TIMO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) if (!request_region(io, 8, "wdt501p")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) pr_err("I/O address 0x%04x already in use\n", io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) ret = request_irq(irq, wdt_interrupt, 0, "wdt501p", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) pr_err("IRQ %d is not free\n", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) goto outreg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) ret = register_reboot_notifier(&wdt_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) pr_err("cannot register reboot notifier (err=%d)\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) goto outirq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) if (type == 501) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) ret = misc_register(&temp_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) pr_err("cannot register miscdev on minor=%d (err=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) TEMP_MINOR, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) goto outrbt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) ret = misc_register(&wdt_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) pr_err("cannot register miscdev on minor=%d (err=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) WATCHDOG_MINOR, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) goto outmisc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) pr_info("WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) io, irq, heartbeat, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (type == 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) pr_info("Fan Tachometer is %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) tachometer ? "Enabled" : "Disabled");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) outmisc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) if (type == 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) misc_deregister(&temp_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) outrbt:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) unregister_reboot_notifier(&wdt_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) outirq:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) free_irq(irq, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) outreg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) release_region(io, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) module_init(wdt_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) module_exit(wdt_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) MODULE_AUTHOR("Alan Cox");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) MODULE_DESCRIPTION("Driver for ISA ICS watchdog cards (WDT500/501)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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