Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
39309645 AC |
32 | * - added nowayout module option to override |
33 | * CONFIG_WATCHDOG_NOWAYOUT | |
b10958d3 WVS |
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 | |
1da177e4 LT |
39 | * |
40 | */ | |
41 | ||
b10958d3 | 42 | #define VERSION "0.6" |
1c067318 WVS |
43 | #define WATCHDOG_NAME "mixcomwd" |
44 | #define PFX WATCHDOG_NAME ": " | |
1da177e4 LT |
45 | |
46 | #include <linux/module.h> | |
47 | #include <linux/moduleparam.h> | |
1da177e4 LT |
48 | #include <linux/types.h> |
49 | #include <linux/miscdevice.h> | |
50 | #include <linux/ioport.h> | |
51 | #include <linux/watchdog.h> | |
52 | #include <linux/fs.h> | |
53 | #include <linux/reboot.h> | |
54 | #include <linux/init.h> | |
4e57b681 TS |
55 | #include <linux/jiffies.h> |
56 | #include <linux/timer.h> | |
39309645 AC |
57 | #include <linux/uaccess.h> |
58 | #include <linux/io.h> | |
1da177e4 | 59 | |
63e6e17e WVS |
60 | /* |
61 | * We have two types of cards that can be probed: | |
62 | * 1) The Mixcom cards: these cards can be found at addresses | |
63 | * 0x180, 0x280, 0x380 with an additional offset of 0xc10. | |
64 | * (Or 0xd90, 0xe90, 0xf90). | |
65 | * 2) The FlashCOM cards: these cards can be set up at | |
66 | * 0x300 -> 0x378, in 0x8 jumps with an offset of 0x04. | |
67 | * (Or 0x304 -> 0x37c in 0x8 jumps). | |
68 | * Each card has it's own ID. | |
69 | */ | |
1da177e4 | 70 | #define MIXCOM_ID 0x11 |
1da177e4 | 71 | #define FLASHCOM_ID 0x18 |
21baf3c7 WVS |
72 | static struct { |
73 | int ioport; | |
74 | int id; | |
75 | } mixcomwd_io_info[] __devinitdata = { | |
76 | /* The Mixcom cards */ | |
77 | {0x0d90, MIXCOM_ID}, | |
78 | {0x0e90, MIXCOM_ID}, | |
79 | {0x0f90, MIXCOM_ID}, | |
80 | /* The FlashCOM cards */ | |
81 | {0x0304, FLASHCOM_ID}, | |
82 | {0x030c, FLASHCOM_ID}, | |
83 | {0x0314, FLASHCOM_ID}, | |
84 | {0x031c, FLASHCOM_ID}, | |
85 | {0x0324, FLASHCOM_ID}, | |
86 | {0x032c, FLASHCOM_ID}, | |
87 | {0x0334, FLASHCOM_ID}, | |
88 | {0x033c, FLASHCOM_ID}, | |
89 | {0x0344, FLASHCOM_ID}, | |
90 | {0x034c, FLASHCOM_ID}, | |
91 | {0x0354, FLASHCOM_ID}, | |
92 | {0x035c, FLASHCOM_ID}, | |
93 | {0x0364, FLASHCOM_ID}, | |
94 | {0x036c, FLASHCOM_ID}, | |
95 | {0x0374, FLASHCOM_ID}, | |
96 | {0x037c, FLASHCOM_ID}, | |
97 | /* The end of the list */ | |
98 | {0x0000, 0}, | |
99 | }; | |
1da177e4 | 100 | |
82eb7c50 JS |
101 | static void mixcomwd_timerfun(unsigned long d); |
102 | ||
1da177e4 LT |
103 | static unsigned long mixcomwd_opened; /* long req'd for setbit --RR */ |
104 | ||
105 | static int watchdog_port; | |
106 | static int mixcomwd_timer_alive; | |
82eb7c50 | 107 | static DEFINE_TIMER(mixcomwd_timer, mixcomwd_timerfun, 0, 0); |
1da177e4 LT |
108 | static char expect_close; |
109 | ||
4bfdf378 | 110 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 111 | module_param(nowayout, int, 0); |
39309645 AC |
112 | MODULE_PARM_DESC(nowayout, |
113 | "Watchdog cannot be stopped once started (default=" | |
114 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
1da177e4 LT |
115 | |
116 | static void mixcomwd_ping(void) | |
117 | { | |
39309645 | 118 | outb_p(55, watchdog_port); |
1da177e4 LT |
119 | return; |
120 | } | |
121 | ||
122 | static void mixcomwd_timerfun(unsigned long d) | |
123 | { | |
124 | mixcomwd_ping(); | |
82eb7c50 | 125 | mod_timer(&mixcomwd_timer, jiffies + 5 * HZ); |
1da177e4 LT |
126 | } |
127 | ||
128 | /* | |
129 | * Allow only one person to hold it open | |
130 | */ | |
131 | ||
132 | static int mixcomwd_open(struct inode *inode, struct file *file) | |
133 | { | |
39309645 | 134 | if (test_and_set_bit(0, &mixcomwd_opened)) |
1da177e4 | 135 | return -EBUSY; |
39309645 | 136 | |
1da177e4 LT |
137 | mixcomwd_ping(); |
138 | ||
39309645 | 139 | if (nowayout) |
1da177e4 LT |
140 | /* |
141 | * fops_get() code via open() has already done | |
142 | * a try_module_get() so it is safe to do the | |
143 | * __module_get(). | |
144 | */ | |
145 | __module_get(THIS_MODULE); | |
39309645 AC |
146 | else { |
147 | if (mixcomwd_timer_alive) { | |
1da177e4 | 148 | del_timer(&mixcomwd_timer); |
39309645 | 149 | mixcomwd_timer_alive = 0; |
1da177e4 LT |
150 | } |
151 | } | |
152 | return nonseekable_open(inode, file); | |
153 | } | |
154 | ||
155 | static int mixcomwd_release(struct inode *inode, struct file *file) | |
156 | { | |
157 | if (expect_close == 42) { | |
39309645 AC |
158 | if (mixcomwd_timer_alive) { |
159 | printk(KERN_ERR PFX | |
160 | "release called while internal timer alive"); | |
1da177e4 LT |
161 | return -EBUSY; |
162 | } | |
39309645 | 163 | mixcomwd_timer_alive = 1; |
82eb7c50 | 164 | mod_timer(&mixcomwd_timer, jiffies + 5 * HZ); |
39309645 AC |
165 | } else |
166 | printk(KERN_CRIT PFX | |
167 | "WDT device closed unexpectedly. WDT will not stop!\n"); | |
1da177e4 | 168 | |
39309645 AC |
169 | clear_bit(0, &mixcomwd_opened); |
170 | expect_close = 0; | |
1da177e4 LT |
171 | return 0; |
172 | } | |
173 | ||
174 | ||
39309645 AC |
175 | static ssize_t mixcomwd_write(struct file *file, const char __user *data, |
176 | size_t len, loff_t *ppos) | |
1da177e4 | 177 | { |
39309645 | 178 | if (len) { |
1da177e4 LT |
179 | if (!nowayout) { |
180 | size_t i; | |
181 | ||
182 | /* In case it was set long ago */ | |
183 | expect_close = 0; | |
184 | ||
185 | for (i = 0; i != len; i++) { | |
186 | char c; | |
187 | if (get_user(c, data + i)) | |
188 | return -EFAULT; | |
189 | if (c == 'V') | |
190 | expect_close = 42; | |
191 | } | |
192 | } | |
193 | mixcomwd_ping(); | |
194 | } | |
195 | return len; | |
196 | } | |
197 | ||
39309645 AC |
198 | static long mixcomwd_ioctl(struct file *file, |
199 | unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
200 | { |
201 | void __user *argp = (void __user *)arg; | |
202 | int __user *p = argp; | |
203 | int status; | |
42747d71 | 204 | static const struct watchdog_info ident = { |
1da177e4 LT |
205 | .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, |
206 | .firmware_version = 1, | |
207 | .identity = "MixCOM watchdog", | |
208 | }; | |
209 | ||
39309645 | 210 | switch (cmd) { |
0c06090c WVS |
211 | case WDIOC_GETSUPPORT: |
212 | if (copy_to_user(argp, &ident, sizeof(ident))) | |
213 | return -EFAULT; | |
214 | break; | |
39309645 AC |
215 | case WDIOC_GETSTATUS: |
216 | status = mixcomwd_opened; | |
217 | if (!nowayout) | |
218 | status |= mixcomwd_timer_alive; | |
219 | return put_user(status, p); | |
220 | case WDIOC_GETBOOTSTATUS: | |
221 | return put_user(0, p); | |
39309645 AC |
222 | case WDIOC_KEEPALIVE: |
223 | mixcomwd_ping(); | |
224 | break; | |
225 | default: | |
226 | return -ENOTTY; | |
1da177e4 LT |
227 | } |
228 | return 0; | |
229 | } | |
230 | ||
10a29304 | 231 | static const struct file_operations mixcomwd_fops = { |
1da177e4 LT |
232 | .owner = THIS_MODULE, |
233 | .llseek = no_llseek, | |
234 | .write = mixcomwd_write, | |
39309645 | 235 | .unlocked_ioctl = mixcomwd_ioctl, |
1da177e4 LT |
236 | .open = mixcomwd_open, |
237 | .release = mixcomwd_release, | |
238 | }; | |
239 | ||
10a29304 | 240 | static struct miscdevice mixcomwd_miscdev = { |
1da177e4 LT |
241 | .minor = WATCHDOG_MINOR, |
242 | .name = "watchdog", | |
243 | .fops = &mixcomwd_fops, | |
244 | }; | |
245 | ||
4194db10 | 246 | static int __init checkcard(int port, int card_id) |
1da177e4 LT |
247 | { |
248 | int id; | |
249 | ||
39309645 | 250 | if (!request_region(port, 1, "MixCOM watchdog")) |
1da177e4 | 251 | return 0; |
1da177e4 | 252 | |
39309645 AC |
253 | id = inb_p(port); |
254 | if (card_id == MIXCOM_ID) | |
4194db10 WVS |
255 | id &= 0x3f; |
256 | ||
39309645 | 257 | if (id != card_id) { |
1da177e4 LT |
258 | release_region(port, 1); |
259 | return 0; | |
260 | } | |
4194db10 WVS |
261 | return 1; |
262 | } | |
1da177e4 LT |
263 | |
264 | static int __init mixcomwd_init(void) | |
265 | { | |
39309645 | 266 | int i, ret, found = 0; |
1da177e4 | 267 | |
21baf3c7 WVS |
268 | for (i = 0; !found && mixcomwd_io_info[i].ioport != 0; i++) { |
269 | if (checkcard(mixcomwd_io_info[i].ioport, | |
270 | mixcomwd_io_info[i].id)) { | |
1da177e4 | 271 | found = 1; |
21baf3c7 | 272 | watchdog_port = mixcomwd_io_info[i].ioport; |
1da177e4 LT |
273 | } |
274 | } | |
275 | ||
276 | if (!found) { | |
39309645 AC |
277 | printk(KERN_ERR PFX |
278 | "No card detected, or port not available.\n"); | |
1da177e4 LT |
279 | return -ENODEV; |
280 | } | |
281 | ||
282 | ret = misc_register(&mixcomwd_miscdev); | |
39309645 AC |
283 | if (ret) { |
284 | printk(KERN_ERR PFX | |
285 | "cannot register miscdev on minor=%d (err=%d)\n", | |
286 | WATCHDOG_MINOR, ret); | |
27c7742e | 287 | goto error_misc_register_watchdog; |
1da177e4 LT |
288 | } |
289 | ||
39309645 AC |
290 | printk(KERN_INFO |
291 | "MixCOM watchdog driver v%s, watchdog port at 0x%3x\n", | |
292 | VERSION, watchdog_port); | |
1da177e4 LT |
293 | |
294 | return 0; | |
27c7742e WVS |
295 | |
296 | error_misc_register_watchdog: | |
297 | release_region(watchdog_port, 1); | |
298 | watchdog_port = 0x0000; | |
299 | return ret; | |
1da177e4 LT |
300 | } |
301 | ||
302 | static void __exit mixcomwd_exit(void) | |
303 | { | |
304 | if (!nowayout) { | |
39309645 | 305 | if (mixcomwd_timer_alive) { |
1c067318 | 306 | printk(KERN_WARNING PFX "I quit now, hardware will" |
1da177e4 | 307 | " probably reboot!\n"); |
82eb7c50 | 308 | del_timer_sync(&mixcomwd_timer); |
39309645 | 309 | mixcomwd_timer_alive = 0; |
1da177e4 LT |
310 | } |
311 | } | |
1da177e4 | 312 | misc_deregister(&mixcomwd_miscdev); |
39309645 | 313 | release_region(watchdog_port, 1); |
1da177e4 LT |
314 | } |
315 | ||
316 | module_init(mixcomwd_init); | |
317 | module_exit(mixcomwd_exit); | |
318 | ||
319 | MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>"); | |
320 | MODULE_DESCRIPTION("MixCom Watchdog driver"); | |
1c067318 | 321 | MODULE_VERSION(VERSION); |
1da177e4 LT |
322 | MODULE_LICENSE("GPL"); |
323 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |