^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * MixCom Watchdog: A Simple Hardware Watchdog Device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Based on Softdog driver by Alan Cox and PC Watchdog driver by Ken Hollis
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Gergely Madarasz <gorgo@itc.hu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (c) 1999 ITConsult-Pro Co. <info@itc.hu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Version 0.1 (99/04/15):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * - first version
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Version 0.2 (99/06/16):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * - added kernel timer watchdog ping after close
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * since the hardware does not support watchdog shutdown
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Version 0.3 (99/06/21):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * - added WDIOC_GETSTATUS and WDIOC_GETSUPPORT ioctl calls
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Version 0.3.1 (99/06/22):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * - allow module removal while internal timer is active,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * print warning about probable reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Version 0.4 (99/11/15):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * - support for one more type board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * - added nowayout module option to override
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * CONFIG_WATCHDOG_NOWAYOUT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Version 0.6 (2002/04/12): Rob Radez <rob@osinvestor.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * - make mixcomwd_opened unsigned,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * removed lock_kernel/unlock_kernel from mixcomwd_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * modified ioctl a bit to conform to API
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define VERSION "0.6"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define WATCHDOG_NAME "mixcomwd"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * We have two types of cards that can be probed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * 1) The Mixcom cards: these cards can be found at addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * 0x180, 0x280, 0x380 with an additional offset of 0xc10.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * (Or 0xd90, 0xe90, 0xf90).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * 2) The FlashCOM cards: these cards can be set up at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * 0x300 -> 0x378, in 0x8 jumps with an offset of 0x04.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * (Or 0x304 -> 0x37c in 0x8 jumps).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * Each card has it's own ID.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #define MIXCOM_ID 0x11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #define FLASHCOM_ID 0x18
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) int ioport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) } mixcomwd_io_info[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* The Mixcom cards */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {0x0d90, MIXCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {0x0e90, MIXCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {0x0f90, MIXCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* The FlashCOM cards */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {0x0304, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {0x030c, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {0x0314, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {0x031c, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {0x0324, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {0x032c, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {0x0334, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {0x033c, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {0x0344, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {0x034c, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {0x0354, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {0x035c, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {0x0364, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {0x036c, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {0x0374, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {0x037c, FLASHCOM_ID},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* The end of the list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {0x0000, 0},
^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 mixcomwd_timerfun(struct timer_list *unused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static unsigned long mixcomwd_opened; /* long req'd for setbit --RR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static int watchdog_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static int mixcomwd_timer_alive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static DEFINE_TIMER(mixcomwd_timer, mixcomwd_timerfun);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static char expect_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) MODULE_PARM_DESC(nowayout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static void mixcomwd_ping(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) outb_p(55, watchdog_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static void mixcomwd_timerfun(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) mixcomwd_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) mod_timer(&mixcomwd_timer, jiffies + 5 * HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) * Allow only one person to hold it open
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int mixcomwd_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (test_and_set_bit(0, &mixcomwd_opened))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) mixcomwd_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * fops_get() code via open() has already done
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * a try_module_get() so it is safe to do the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * __module_get().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) __module_get(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (mixcomwd_timer_alive) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) del_timer(&mixcomwd_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) mixcomwd_timer_alive = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static int mixcomwd_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (expect_close == 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (mixcomwd_timer_alive) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) pr_err("release called while internal timer alive\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) mixcomwd_timer_alive = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) mod_timer(&mixcomwd_timer, jiffies + 5 * HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) pr_crit("WDT device closed unexpectedly. WDT will not stop!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) clear_bit(0, &mixcomwd_opened);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static ssize_t mixcomwd_write(struct file *file, const char __user *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) size_t len, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /* In case it was set long ago */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) for (i = 0; i != len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (get_user(c, data + i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (c == 'V')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) expect_close = 42;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) mixcomwd_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return len;
^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) static long mixcomwd_ioctl(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) int __user *p = argp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static const struct watchdog_info ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) .firmware_version = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) .identity = "MixCOM watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) if (copy_to_user(argp, &ident, sizeof(ident)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) status = mixcomwd_opened;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (!nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) status |= mixcomwd_timer_alive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) return put_user(status, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) case WDIOC_GETBOOTSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) return put_user(0, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) mixcomwd_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static const struct file_operations mixcomwd_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) .write = mixcomwd_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) .unlocked_ioctl = mixcomwd_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) .open = mixcomwd_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) .release = mixcomwd_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static struct miscdevice mixcomwd_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) .minor = WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) .name = "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) .fops = &mixcomwd_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) static int __init checkcard(int port, int card_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) int id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (!request_region(port, 1, "MixCOM watchdog"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) id = inb_p(port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (card_id == MIXCOM_ID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) id &= 0x3f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (id != card_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) release_region(port, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return 1;
^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) static int __init mixcomwd_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) int i, ret, found = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) for (i = 0; !found && mixcomwd_io_info[i].ioport != 0; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) if (checkcard(mixcomwd_io_info[i].ioport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) mixcomwd_io_info[i].id)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) found = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) watchdog_port = mixcomwd_io_info[i].ioport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) if (!found) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) pr_err("No card detected, or port not available\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) ret = misc_register(&mixcomwd_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) pr_err("cannot register miscdev on minor=%d (err=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) WATCHDOG_MINOR, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) goto error_misc_register_watchdog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) pr_info("MixCOM watchdog driver v%s, watchdog port at 0x%3x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) VERSION, watchdog_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) error_misc_register_watchdog:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) release_region(watchdog_port, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) watchdog_port = 0x0000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static void __exit mixcomwd_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) if (mixcomwd_timer_alive) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) pr_warn("I quit now, hardware will probably reboot!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) del_timer_sync(&mixcomwd_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) mixcomwd_timer_alive = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) misc_deregister(&mixcomwd_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) release_region(watchdog_port, 1);
^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) module_init(mixcomwd_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) module_exit(mixcomwd_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) MODULE_DESCRIPTION("MixCom Watchdog driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) MODULE_VERSION(VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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