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1 | /* |
2 | * MixCom Watchdog: A Simple Hardware Watchdog Device |
3 | * Based on Softdog driver by Alan Cox and PC Watchdog driver by Ken Hollis |
4 | * |
5 | * Author: Gergely Madarasz <gorgo@itc.hu> |
6 | * |
7 | * Copyright (c) 1999 ITConsult-Pro Co. <info@itc.hu> |
8 | * |
9 | * This program is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU General Public License |
11 | * as published by the Free Software Foundation; either version |
12 | * 2 of the License, or (at your option) any later version. |
13 | * |
14 | * Version 0.1 (99/04/15): |
15 | * - first version |
16 | * |
17 | * Version 0.2 (99/06/16): |
18 | * - added kernel timer watchdog ping after close |
19 | * since the hardware does not support watchdog shutdown |
20 | * |
21 | * Version 0.3 (99/06/21): |
22 | * - added WDIOC_GETSTATUS and WDIOC_GETSUPPORT ioctl calls |
23 | * |
24 | * Version 0.3.1 (99/06/22): |
25 | * - allow module removal while internal timer is active, |
26 | * print warning about probable reset |
27 | * |
28 | * Version 0.4 (99/11/15): |
29 | * - support for one more type board |
30 | * |
31 | * Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com> |
32 | * - added nowayout module option to override |
33 | * CONFIG_WATCHDOG_NOWAYOUT |
34 | * |
35 | * Version 0.6 (2002/04/12): Rob Radez <rob@osinvestor.com> |
36 | * - make mixcomwd_opened unsigned, |
37 | * removed lock_kernel/unlock_kernel from mixcomwd_release, |
38 | * modified ioctl a bit to conform to API |
39 | * |
40 | */ |
41 | |
42 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
43 | |
44 | #define VERSION "0.6" |
45 | #define WATCHDOG_NAME "mixcomwd" |
46 | |
47 | #include <linux/module.h> |
48 | #include <linux/moduleparam.h> |
49 | #include <linux/types.h> |
50 | #include <linux/miscdevice.h> |
51 | #include <linux/ioport.h> |
52 | #include <linux/watchdog.h> |
53 | #include <linux/fs.h> |
54 | #include <linux/reboot.h> |
55 | #include <linux/init.h> |
56 | #include <linux/jiffies.h> |
57 | #include <linux/timer.h> |
58 | #include <linux/uaccess.h> |
59 | #include <linux/io.h> |
60 | |
61 | /* |
62 | * We have two types of cards that can be probed: |
63 | * 1) The Mixcom cards: these cards can be found at addresses |
64 | * 0x180, 0x280, 0x380 with an additional offset of 0xc10. |
65 | * (Or 0xd90, 0xe90, 0xf90). |
66 | * 2) The FlashCOM cards: these cards can be set up at |
67 | * 0x300 -> 0x378, in 0x8 jumps with an offset of 0x04. |
68 | * (Or 0x304 -> 0x37c in 0x8 jumps). |
69 | * Each card has it's own ID. |
70 | */ |
71 | #define MIXCOM_ID 0x11 |
72 | #define FLASHCOM_ID 0x18 |
73 | static struct { |
74 | int ioport; |
75 | int id; |
76 | } mixcomwd_io_info[] = { |
77 | /* The Mixcom cards */ |
78 | {0x0d90, MIXCOM_ID}, |
79 | {0x0e90, MIXCOM_ID}, |
80 | {0x0f90, MIXCOM_ID}, |
81 | /* The FlashCOM cards */ |
82 | {0x0304, FLASHCOM_ID}, |
83 | {0x030c, FLASHCOM_ID}, |
84 | {0x0314, FLASHCOM_ID}, |
85 | {0x031c, FLASHCOM_ID}, |
86 | {0x0324, FLASHCOM_ID}, |
87 | {0x032c, FLASHCOM_ID}, |
88 | {0x0334, FLASHCOM_ID}, |
89 | {0x033c, FLASHCOM_ID}, |
90 | {0x0344, FLASHCOM_ID}, |
91 | {0x034c, FLASHCOM_ID}, |
92 | {0x0354, FLASHCOM_ID}, |
93 | {0x035c, FLASHCOM_ID}, |
94 | {0x0364, FLASHCOM_ID}, |
95 | {0x036c, FLASHCOM_ID}, |
96 | {0x0374, FLASHCOM_ID}, |
97 | {0x037c, FLASHCOM_ID}, |
98 | /* The end of the list */ |
99 | {0x0000, 0}, |
100 | }; |
101 | |
102 | static void mixcomwd_timerfun(unsigned long d); |
103 | |
104 | static unsigned long mixcomwd_opened; /* long req'd for setbit --RR */ |
105 | |
106 | static int watchdog_port; |
107 | static int mixcomwd_timer_alive; |
108 | static DEFINE_TIMER(mixcomwd_timer, mixcomwd_timerfun, 0, 0); |
109 | static char expect_close; |
110 | |
111 | static bool nowayout = WATCHDOG_NOWAYOUT; |
112 | module_param(nowayout, bool, 0); |
113 | MODULE_PARM_DESC(nowayout, |
114 | "Watchdog cannot be stopped once started (default=" |
115 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
116 | |
117 | static void mixcomwd_ping(void) |
118 | { |
119 | outb_p(55, watchdog_port); |
120 | return; |
121 | } |
122 | |
123 | static void mixcomwd_timerfun(unsigned long d) |
124 | { |
125 | mixcomwd_ping(); |
126 | mod_timer(&mixcomwd_timer, jiffies + 5 * HZ); |
127 | } |
128 | |
129 | /* |
130 | * Allow only one person to hold it open |
131 | */ |
132 | |
133 | static int mixcomwd_open(struct inode *inode, struct file *file) |
134 | { |
135 | if (test_and_set_bit(0, &mixcomwd_opened)) |
136 | return -EBUSY; |
137 | |
138 | mixcomwd_ping(); |
139 | |
140 | if (nowayout) |
141 | /* |
142 | * fops_get() code via open() has already done |
143 | * a try_module_get() so it is safe to do the |
144 | * __module_get(). |
145 | */ |
146 | __module_get(THIS_MODULE); |
147 | else { |
148 | if (mixcomwd_timer_alive) { |
149 | del_timer(&mixcomwd_timer); |
150 | mixcomwd_timer_alive = 0; |
151 | } |
152 | } |
153 | return nonseekable_open(inode, file); |
154 | } |
155 | |
156 | static int mixcomwd_release(struct inode *inode, struct file *file) |
157 | { |
158 | if (expect_close == 42) { |
159 | if (mixcomwd_timer_alive) { |
160 | pr_err("release called while internal timer alive\n"); |
161 | return -EBUSY; |
162 | } |
163 | mixcomwd_timer_alive = 1; |
164 | mod_timer(&mixcomwd_timer, jiffies + 5 * HZ); |
165 | } else |
166 | pr_crit("WDT device closed unexpectedly. WDT will not stop!\n"); |
167 | |
168 | clear_bit(0, &mixcomwd_opened); |
169 | expect_close = 0; |
170 | return 0; |
171 | } |
172 | |
173 | |
174 | static ssize_t mixcomwd_write(struct file *file, const char __user *data, |
175 | size_t len, loff_t *ppos) |
176 | { |
177 | if (len) { |
178 | if (!nowayout) { |
179 | size_t i; |
180 | |
181 | /* In case it was set long ago */ |
182 | expect_close = 0; |
183 | |
184 | for (i = 0; i != len; i++) { |
185 | char c; |
186 | if (get_user(c, data + i)) |
187 | return -EFAULT; |
188 | if (c == 'V') |
189 | expect_close = 42; |
190 | } |
191 | } |
192 | mixcomwd_ping(); |
193 | } |
194 | return len; |
195 | } |
196 | |
197 | static long mixcomwd_ioctl(struct file *file, |
198 | unsigned int cmd, unsigned long arg) |
199 | { |
200 | void __user *argp = (void __user *)arg; |
201 | int __user *p = argp; |
202 | int status; |
203 | static const struct watchdog_info ident = { |
204 | .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, |
205 | .firmware_version = 1, |
206 | .identity = "MixCOM watchdog", |
207 | }; |
208 | |
209 | switch (cmd) { |
210 | case WDIOC_GETSUPPORT: |
211 | if (copy_to_user(argp, &ident, sizeof(ident))) |
212 | return -EFAULT; |
213 | break; |
214 | case WDIOC_GETSTATUS: |
215 | status = mixcomwd_opened; |
216 | if (!nowayout) |
217 | status |= mixcomwd_timer_alive; |
218 | return put_user(status, p); |
219 | case WDIOC_GETBOOTSTATUS: |
220 | return put_user(0, p); |
221 | case WDIOC_KEEPALIVE: |
222 | mixcomwd_ping(); |
223 | break; |
224 | default: |
225 | return -ENOTTY; |
226 | } |
227 | return 0; |
228 | } |
229 | |
230 | static const struct file_operations mixcomwd_fops = { |
231 | .owner = THIS_MODULE, |
232 | .llseek = no_llseek, |
233 | .write = mixcomwd_write, |
234 | .unlocked_ioctl = mixcomwd_ioctl, |
235 | .open = mixcomwd_open, |
236 | .release = mixcomwd_release, |
237 | }; |
238 | |
239 | static struct miscdevice mixcomwd_miscdev = { |
240 | .minor = WATCHDOG_MINOR, |
241 | .name = "watchdog", |
242 | .fops = &mixcomwd_fops, |
243 | }; |
244 | |
245 | static int __init checkcard(int port, int card_id) |
246 | { |
247 | int id; |
248 | |
249 | if (!request_region(port, 1, "MixCOM watchdog")) |
250 | return 0; |
251 | |
252 | id = inb_p(port); |
253 | if (card_id == MIXCOM_ID) |
254 | id &= 0x3f; |
255 | |
256 | if (id != card_id) { |
257 | release_region(port, 1); |
258 | return 0; |
259 | } |
260 | return 1; |
261 | } |
262 | |
263 | static int __init mixcomwd_init(void) |
264 | { |
265 | int i, ret, found = 0; |
266 | |
267 | for (i = 0; !found && mixcomwd_io_info[i].ioport != 0; i++) { |
268 | if (checkcard(mixcomwd_io_info[i].ioport, |
269 | mixcomwd_io_info[i].id)) { |
270 | found = 1; |
271 | watchdog_port = mixcomwd_io_info[i].ioport; |
272 | } |
273 | } |
274 | |
275 | if (!found) { |
276 | pr_err("No card detected, or port not available\n"); |
277 | return -ENODEV; |
278 | } |
279 | |
280 | ret = misc_register(&mixcomwd_miscdev); |
281 | if (ret) { |
282 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
283 | WATCHDOG_MINOR, ret); |
284 | goto error_misc_register_watchdog; |
285 | } |
286 | |
287 | pr_info("MixCOM watchdog driver v%s, watchdog port at 0x%3x\n", |
288 | VERSION, watchdog_port); |
289 | |
290 | return 0; |
291 | |
292 | error_misc_register_watchdog: |
293 | release_region(watchdog_port, 1); |
294 | watchdog_port = 0x0000; |
295 | return ret; |
296 | } |
297 | |
298 | static void __exit mixcomwd_exit(void) |
299 | { |
300 | if (!nowayout) { |
301 | if (mixcomwd_timer_alive) { |
302 | pr_warn("I quit now, hardware will probably reboot!\n"); |
303 | del_timer_sync(&mixcomwd_timer); |
304 | mixcomwd_timer_alive = 0; |
305 | } |
306 | } |
307 | misc_deregister(&mixcomwd_miscdev); |
308 | release_region(watchdog_port, 1); |
309 | } |
310 | |
311 | module_init(mixcomwd_init); |
312 | module_exit(mixcomwd_exit); |
313 | |
314 | MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>"); |
315 | MODULE_DESCRIPTION("MixCom Watchdog driver"); |
316 | MODULE_VERSION(VERSION); |
317 | MODULE_LICENSE("GPL"); |
318 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
319 |
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