Commit | Line | Data |
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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> | |
b10958d3 WVS |
32 | * - added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT |
33 | * | |
34 | * Version 0.6 (2002/04/12): Rob Radez <rob@osinvestor.com> | |
35 | * - make mixcomwd_opened unsigned, | |
36 | * removed lock_kernel/unlock_kernel from mixcomwd_release, | |
37 | * modified ioctl a bit to conform to API | |
1da177e4 LT |
38 | * |
39 | */ | |
40 | ||
b10958d3 | 41 | #define VERSION "0.6" |
1da177e4 LT |
42 | |
43 | #include <linux/module.h> | |
44 | #include <linux/moduleparam.h> | |
1da177e4 LT |
45 | #include <linux/types.h> |
46 | #include <linux/miscdevice.h> | |
47 | #include <linux/ioport.h> | |
48 | #include <linux/watchdog.h> | |
49 | #include <linux/fs.h> | |
50 | #include <linux/reboot.h> | |
51 | #include <linux/init.h> | |
4e57b681 TS |
52 | #include <linux/jiffies.h> |
53 | #include <linux/timer.h> | |
1da177e4 LT |
54 | #include <asm/uaccess.h> |
55 | #include <asm/io.h> | |
56 | ||
63e6e17e WVS |
57 | /* |
58 | * We have two types of cards that can be probed: | |
59 | * 1) The Mixcom cards: these cards can be found at addresses | |
60 | * 0x180, 0x280, 0x380 with an additional offset of 0xc10. | |
61 | * (Or 0xd90, 0xe90, 0xf90). | |
62 | * 2) The FlashCOM cards: these cards can be set up at | |
63 | * 0x300 -> 0x378, in 0x8 jumps with an offset of 0x04. | |
64 | * (Or 0x304 -> 0x37c in 0x8 jumps). | |
65 | * Each card has it's own ID. | |
66 | */ | |
1da177e4 | 67 | #define MIXCOM_ID 0x11 |
1da177e4 | 68 | #define FLASHCOM_ID 0x18 |
21baf3c7 WVS |
69 | static struct { |
70 | int ioport; | |
71 | int id; | |
72 | } mixcomwd_io_info[] __devinitdata = { | |
73 | /* The Mixcom cards */ | |
74 | {0x0d90, MIXCOM_ID}, | |
75 | {0x0e90, MIXCOM_ID}, | |
76 | {0x0f90, MIXCOM_ID}, | |
77 | /* The FlashCOM cards */ | |
78 | {0x0304, FLASHCOM_ID}, | |
79 | {0x030c, FLASHCOM_ID}, | |
80 | {0x0314, FLASHCOM_ID}, | |
81 | {0x031c, FLASHCOM_ID}, | |
82 | {0x0324, FLASHCOM_ID}, | |
83 | {0x032c, FLASHCOM_ID}, | |
84 | {0x0334, FLASHCOM_ID}, | |
85 | {0x033c, FLASHCOM_ID}, | |
86 | {0x0344, FLASHCOM_ID}, | |
87 | {0x034c, FLASHCOM_ID}, | |
88 | {0x0354, FLASHCOM_ID}, | |
89 | {0x035c, FLASHCOM_ID}, | |
90 | {0x0364, FLASHCOM_ID}, | |
91 | {0x036c, FLASHCOM_ID}, | |
92 | {0x0374, FLASHCOM_ID}, | |
93 | {0x037c, FLASHCOM_ID}, | |
94 | /* The end of the list */ | |
95 | {0x0000, 0}, | |
96 | }; | |
1da177e4 | 97 | |
82eb7c50 JS |
98 | static void mixcomwd_timerfun(unsigned long d); |
99 | ||
1da177e4 LT |
100 | static unsigned long mixcomwd_opened; /* long req'd for setbit --RR */ |
101 | ||
102 | static int watchdog_port; | |
103 | static int mixcomwd_timer_alive; | |
82eb7c50 | 104 | static DEFINE_TIMER(mixcomwd_timer, mixcomwd_timerfun, 0, 0); |
1da177e4 LT |
105 | static char expect_close; |
106 | ||
4bfdf378 | 107 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 108 | module_param(nowayout, int, 0); |
bffda5c8 | 109 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
1da177e4 LT |
110 | |
111 | static void mixcomwd_ping(void) | |
112 | { | |
113 | outb_p(55,watchdog_port); | |
114 | return; | |
115 | } | |
116 | ||
117 | static void mixcomwd_timerfun(unsigned long d) | |
118 | { | |
119 | mixcomwd_ping(); | |
120 | ||
82eb7c50 | 121 | mod_timer(&mixcomwd_timer, jiffies + 5 * HZ); |
1da177e4 LT |
122 | } |
123 | ||
124 | /* | |
125 | * Allow only one person to hold it open | |
126 | */ | |
127 | ||
128 | static int mixcomwd_open(struct inode *inode, struct file *file) | |
129 | { | |
130 | if(test_and_set_bit(0,&mixcomwd_opened)) { | |
131 | return -EBUSY; | |
132 | } | |
133 | mixcomwd_ping(); | |
134 | ||
135 | if (nowayout) { | |
136 | /* | |
137 | * fops_get() code via open() has already done | |
138 | * a try_module_get() so it is safe to do the | |
139 | * __module_get(). | |
140 | */ | |
141 | __module_get(THIS_MODULE); | |
142 | } else { | |
143 | if(mixcomwd_timer_alive) { | |
144 | del_timer(&mixcomwd_timer); | |
145 | mixcomwd_timer_alive=0; | |
146 | } | |
147 | } | |
148 | return nonseekable_open(inode, file); | |
149 | } | |
150 | ||
151 | static int mixcomwd_release(struct inode *inode, struct file *file) | |
152 | { | |
153 | if (expect_close == 42) { | |
154 | if(mixcomwd_timer_alive) { | |
155 | printk(KERN_ERR "mixcomwd: release called while internal timer alive"); | |
156 | return -EBUSY; | |
157 | } | |
1da177e4 | 158 | mixcomwd_timer_alive=1; |
82eb7c50 | 159 | mod_timer(&mixcomwd_timer, jiffies + 5 * HZ); |
1da177e4 LT |
160 | } else { |
161 | printk(KERN_CRIT "mixcomwd: WDT device closed unexpectedly. WDT will not stop!\n"); | |
162 | } | |
163 | ||
164 | clear_bit(0,&mixcomwd_opened); | |
165 | expect_close=0; | |
166 | return 0; | |
167 | } | |
168 | ||
169 | ||
170 | static ssize_t mixcomwd_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) | |
171 | { | |
172 | if(len) | |
173 | { | |
174 | if (!nowayout) { | |
175 | size_t i; | |
176 | ||
177 | /* In case it was set long ago */ | |
178 | expect_close = 0; | |
179 | ||
180 | for (i = 0; i != len; i++) { | |
181 | char c; | |
182 | if (get_user(c, data + i)) | |
183 | return -EFAULT; | |
184 | if (c == 'V') | |
185 | expect_close = 42; | |
186 | } | |
187 | } | |
188 | mixcomwd_ping(); | |
189 | } | |
190 | return len; | |
191 | } | |
192 | ||
193 | static int mixcomwd_ioctl(struct inode *inode, struct file *file, | |
194 | unsigned int cmd, unsigned long arg) | |
195 | { | |
196 | void __user *argp = (void __user *)arg; | |
197 | int __user *p = argp; | |
198 | int status; | |
199 | static struct watchdog_info ident = { | |
200 | .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, | |
201 | .firmware_version = 1, | |
202 | .identity = "MixCOM watchdog", | |
203 | }; | |
204 | ||
205 | switch(cmd) | |
206 | { | |
207 | case WDIOC_GETSTATUS: | |
208 | status=mixcomwd_opened; | |
209 | if (!nowayout) { | |
210 | status|=mixcomwd_timer_alive; | |
211 | } | |
212 | if (copy_to_user(p, &status, sizeof(int))) { | |
213 | return -EFAULT; | |
214 | } | |
215 | break; | |
216 | case WDIOC_GETSUPPORT: | |
217 | if (copy_to_user(argp, &ident, sizeof(ident))) { | |
218 | return -EFAULT; | |
219 | } | |
220 | break; | |
221 | case WDIOC_KEEPALIVE: | |
222 | mixcomwd_ping(); | |
223 | break; | |
224 | default: | |
795b89d2 | 225 | return -ENOTTY; |
1da177e4 LT |
226 | } |
227 | return 0; | |
228 | } | |
229 | ||
62322d25 | 230 | static const struct file_operations mixcomwd_fops= |
1da177e4 LT |
231 | { |
232 | .owner = THIS_MODULE, | |
233 | .llseek = no_llseek, | |
234 | .write = mixcomwd_write, | |
235 | .ioctl = mixcomwd_ioctl, | |
236 | .open = mixcomwd_open, | |
237 | .release = mixcomwd_release, | |
238 | }; | |
239 | ||
240 | static struct miscdevice mixcomwd_miscdev= | |
241 | { | |
242 | .minor = WATCHDOG_MINOR, | |
243 | .name = "watchdog", | |
244 | .fops = &mixcomwd_fops, | |
245 | }; | |
246 | ||
4194db10 | 247 | static int __init checkcard(int port, int card_id) |
1da177e4 LT |
248 | { |
249 | int id; | |
250 | ||
1da177e4 LT |
251 | if (!request_region(port, 1, "MixCOM watchdog")) { |
252 | return 0; | |
253 | } | |
254 | ||
255 | id=inb_p(port); | |
4194db10 WVS |
256 | if (card_id==MIXCOM_ID) |
257 | id &= 0x3f; | |
258 | ||
259 | if (id!=card_id) { | |
1da177e4 LT |
260 | release_region(port, 1); |
261 | return 0; | |
262 | } | |
4194db10 WVS |
263 | return 1; |
264 | } | |
1da177e4 LT |
265 | |
266 | static int __init mixcomwd_init(void) | |
267 | { | |
268 | int i; | |
269 | int ret; | |
270 | int found=0; | |
271 | ||
21baf3c7 WVS |
272 | for (i = 0; !found && mixcomwd_io_info[i].ioport != 0; i++) { |
273 | if (checkcard(mixcomwd_io_info[i].ioport, | |
274 | mixcomwd_io_info[i].id)) { | |
1da177e4 | 275 | found = 1; |
21baf3c7 | 276 | watchdog_port = mixcomwd_io_info[i].ioport; |
1da177e4 LT |
277 | } |
278 | } | |
279 | ||
280 | if (!found) { | |
281 | printk("mixcomwd: No card detected, or port not available.\n"); | |
282 | return -ENODEV; | |
283 | } | |
284 | ||
285 | ret = misc_register(&mixcomwd_miscdev); | |
286 | if (ret) | |
287 | { | |
288 | release_region(watchdog_port, 1); | |
289 | return ret; | |
290 | } | |
291 | ||
292 | printk(KERN_INFO "MixCOM watchdog driver v%s, watchdog port at 0x%3x\n",VERSION,watchdog_port); | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | static void __exit mixcomwd_exit(void) | |
298 | { | |
299 | if (!nowayout) { | |
300 | if(mixcomwd_timer_alive) { | |
301 | printk(KERN_WARNING "mixcomwd: I quit now, hardware will" | |
302 | " probably reboot!\n"); | |
82eb7c50 | 303 | del_timer_sync(&mixcomwd_timer); |
1da177e4 LT |
304 | mixcomwd_timer_alive=0; |
305 | } | |
306 | } | |
307 | release_region(watchdog_port,1); | |
308 | misc_deregister(&mixcomwd_miscdev); | |
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_LICENSE("GPL"); | |
317 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |