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36#define VERSION "0.5"
37
38#include <linux/module.h>
39#include <linux/config.h>
40#include <linux/types.h>
41#include <linux/kernel.h>
42#include <linux/fs.h>
43#include <linux/mm.h>
44#include <linux/miscdevice.h>
45#include <linux/ioport.h>
46#include <linux/watchdog.h>
47#include <linux/reboot.h>
48#include <linux/init.h>
49#include <linux/smp_lock.h>
50#include <asm/uaccess.h>
51#include <asm/io.h>
52
53static int mixcomwd_ioports[] = { 0x180, 0x280, 0x380, 0x000 };
54
55#define MIXCOM_WATCHDOG_OFFSET 0xc10
56#define MIXCOM_ID 0x11
57#define FLASHCOM_WATCHDOG_OFFSET 0x4
58#define FLASHCOM_ID 0x18
59
60static long mixcomwd_opened;
61
62static int watchdog_port;
63
64static int mixcomwd_timer_alive;
65static struct timer_list mixcomwd_timer;
66static int expect_close = 0;
67
68#ifdef CONFIG_WATCHDOG_NOWAYOUT
69static int nowayout = 1;
70#else
71static int nowayout = 0;
72#endif
73
74MODULE_PARM(nowayout,"i");
75MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
76
77static void mixcomwd_ping(void)
78{
79 outb_p(55,watchdog_port);
80 return;
81}
82
83static void mixcomwd_timerfun(unsigned long d)
84{
85 mixcomwd_ping();
86
87 mod_timer(&mixcomwd_timer,jiffies+ 5*HZ);
88}
89
90
91
92
93
94static int mixcomwd_open(struct inode *inode, struct file *file)
95{
96 if(test_and_set_bit(0,&mixcomwd_opened)) {
97 return -EBUSY;
98 }
99 mixcomwd_ping();
100
101 if (nowayout) {
102 MOD_INC_USE_COUNT;
103 }
104 if(mixcomwd_timer_alive) {
105 del_timer(&mixcomwd_timer);
106 mixcomwd_timer_alive=0;
107 }
108 return 0;
109}
110
111static int mixcomwd_release(struct inode *inode, struct file *file)
112{
113
114 lock_kernel();
115 if (expect_close) {
116 if(mixcomwd_timer_alive) {
117 printk(KERN_ERR "mixcomwd: release called while internal timer alive");
118 unlock_kernel();
119 return -EBUSY;
120 }
121 init_timer(&mixcomwd_timer);
122 mixcomwd_timer.expires=jiffies + 5 * HZ;
123 mixcomwd_timer.function=mixcomwd_timerfun;
124 mixcomwd_timer.data=0;
125 mixcomwd_timer_alive=1;
126 add_timer(&mixcomwd_timer);
127 } else {
128 printk(KERN_CRIT "mixcomwd: WDT device closed unexpectedly. WDT will not stop!\n");
129 }
130
131 clear_bit(0,&mixcomwd_opened);
132 unlock_kernel();
133 return 0;
134}
135
136
137static ssize_t mixcomwd_write(struct file *file, const char *data, size_t len, loff_t *ppos)
138{
139 if (ppos != &file->f_pos) {
140 return -ESPIPE;
141 }
142
143 if(len)
144 {
145 if (!nowayout) {
146 size_t i;
147
148
149 expect_close = 0;
150
151 for (i = 0; i != len; i++) {
152 char c;
153 if (get_user(c, data + i))
154 return -EFAULT;
155 if (c == 'V')
156 expect_close = 1;
157 }
158 }
159 mixcomwd_ping();
160 return 1;
161 }
162 return 0;
163}
164
165static int mixcomwd_ioctl(struct inode *inode, struct file *file,
166 unsigned int cmd, unsigned long arg)
167{
168 int status;
169 static struct watchdog_info ident = {
170 WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
171 1, "MixCOM watchdog"
172 };
173
174 switch(cmd)
175 {
176 case WDIOC_GETSTATUS:
177 status=mixcomwd_opened;
178 if (!nowayout) {
179 status|=mixcomwd_timer_alive;
180 }
181 if (copy_to_user((int *)arg, &status, sizeof(int))) {
182 return -EFAULT;
183 }
184 break;
185 case WDIOC_GETSUPPORT:
186 if (copy_to_user((struct watchdog_info *)arg, &ident,
187 sizeof(ident))) {
188 return -EFAULT;
189 }
190 break;
191 case WDIOC_KEEPALIVE:
192 mixcomwd_ping();
193 break;
194 default:
195 return -ENOTTY;
196 }
197 return 0;
198}
199
200static struct file_operations mixcomwd_fops=
201{
202 owner: THIS_MODULE,
203 write: mixcomwd_write,
204 ioctl: mixcomwd_ioctl,
205 open: mixcomwd_open,
206 release: mixcomwd_release,
207};
208
209static struct miscdevice mixcomwd_miscdev=
210{
211 WATCHDOG_MINOR,
212 "watchdog",
213 &mixcomwd_fops
214};
215
216static int __init mixcomwd_checkcard(int port)
217{
218 int id;
219
220 if(check_region(port+MIXCOM_WATCHDOG_OFFSET,1)) {
221 return 0;
222 }
223
224 id=inb_p(port + MIXCOM_WATCHDOG_OFFSET) & 0x3f;
225 if(id!=MIXCOM_ID) {
226 return 0;
227 }
228 return 1;
229}
230
231static int __init flashcom_checkcard(int port)
232{
233 int id;
234
235 if(check_region(port + FLASHCOM_WATCHDOG_OFFSET,1)) {
236 return 0;
237 }
238
239 id=inb_p(port + FLASHCOM_WATCHDOG_OFFSET);
240 if(id!=FLASHCOM_ID) {
241 return 0;
242 }
243 return 1;
244 }
245
246static int __init mixcomwd_init(void)
247{
248 int i;
249 int ret;
250 int found=0;
251
252 for (i = 0; !found && mixcomwd_ioports[i] != 0; i++) {
253 if (mixcomwd_checkcard(mixcomwd_ioports[i])) {
254 found = 1;
255 watchdog_port = mixcomwd_ioports[i] + MIXCOM_WATCHDOG_OFFSET;
256 }
257 }
258
259
260 for (i = 0x300; !found && i < 0x380; i+=0x8) {
261 if (flashcom_checkcard(i)) {
262 found = 1;
263 watchdog_port = i + FLASHCOM_WATCHDOG_OFFSET;
264 }
265 }
266
267 if (!found) {
268 printk("mixcomwd: No card detected, or port not available.\n");
269 return -ENODEV;
270 }
271
272 request_region(watchdog_port,1,"MixCOM watchdog");
273
274 ret = misc_register(&mixcomwd_miscdev);
275 if (ret)
276 return ret;
277
278 printk(KERN_INFO "MixCOM watchdog driver v%s, watchdog port at 0x%3x\n",VERSION,watchdog_port);
279
280 return 0;
281}
282
283static void __exit mixcomwd_exit(void)
284{
285 if (!nowayout) {
286 if(mixcomwd_timer_alive) {
287 printk(KERN_WARNING "mixcomwd: I quit now, hardware will"
288 " probably reboot!\n");
289 del_timer(&mixcomwd_timer);
290 mixcomwd_timer_alive=0;
291 }
292 }
293 release_region(watchdog_port,1);
294 misc_deregister(&mixcomwd_miscdev);
295}
296
297module_init(mixcomwd_init);
298module_exit(mixcomwd_exit);
299
300MODULE_LICENSE("GPL");
301EXPORT_NO_SYMBOLS;
302
