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path: root/drivers/watchdog/wafer5823wdt.c
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Diffstat (limited to 'drivers/watchdog/wafer5823wdt.c')
-rw-r--r--drivers/watchdog/wafer5823wdt.c80
1 files changed, 46 insertions, 34 deletions
diff --git a/drivers/watchdog/wafer5823wdt.c b/drivers/watchdog/wafer5823wdt.c
index 9e368091f799..886cbbcf3eed 100644
--- a/drivers/watchdog/wafer5823wdt.c
+++ b/drivers/watchdog/wafer5823wdt.c
@@ -36,8 +36,8 @@
36#include <linux/reboot.h> 36#include <linux/reboot.h>
37#include <linux/init.h> 37#include <linux/init.h>
38#include <linux/spinlock.h> 38#include <linux/spinlock.h>
39#include <asm/io.h> 39#include <linux/io.h>
40#include <asm/uaccess.h> 40#include <linux/uaccess.h>
41 41
42#define WATCHDOG_NAME "Wafer 5823 WDT" 42#define WATCHDOG_NAME "Wafer 5823 WDT"
43#define PFX WATCHDOG_NAME ": " 43#define PFX WATCHDOG_NAME ": "
@@ -61,11 +61,15 @@ static int wdt_start = 0x443;
61 61
62static int timeout = WD_TIMO; /* in seconds */ 62static int timeout = WD_TIMO; /* in seconds */
63module_param(timeout, int, 0); 63module_param(timeout, int, 0);
64MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255, default=" __MODULE_STRING(WD_TIMO) "."); 64MODULE_PARM_DESC(timeout,
65 "Watchdog timeout in seconds. 1 <= timeout <= 255, default="
66 __MODULE_STRING(WD_TIMO) ".");
65 67
66static int nowayout = WATCHDOG_NOWAYOUT; 68static int nowayout = WATCHDOG_NOWAYOUT;
67module_param(nowayout, int, 0); 69module_param(nowayout, int, 0);
68MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 70MODULE_PARM_DESC(nowayout,
71 "Watchdog cannot be stopped once started (default="
72 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
69 73
70static void wafwdt_ping(void) 74static void wafwdt_ping(void)
71{ 75{
@@ -90,7 +94,8 @@ wafwdt_stop(void)
90 inb_p(wdt_stop); 94 inb_p(wdt_stop);
91} 95}
92 96
93static ssize_t wafwdt_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos) 97static ssize_t wafwdt_write(struct file *file, const char __user *buf,
98 size_t count, loff_t *ppos)
94{ 99{
95 /* See if we got the magic character 'V' and reload the timer */ 100 /* See if we got the magic character 'V' and reload the timer */
96 if (count) { 101 if (count) {
@@ -100,7 +105,8 @@ static ssize_t wafwdt_write(struct file *file, const char __user *buf, size_t co
100 /* In case it was set long ago */ 105 /* In case it was set long ago */
101 expect_close = 0; 106 expect_close = 0;
102 107
103 /* scan to see whether or not we got the magic character */ 108 /* scan to see whether or not we got the magic
109 character */
104 for (i = 0; i != count; i++) { 110 for (i = 0; i != count; i++) {
105 char c; 111 char c;
106 if (get_user(c, buf + i)) 112 if (get_user(c, buf + i))
@@ -109,27 +115,29 @@ static ssize_t wafwdt_write(struct file *file, const char __user *buf, size_t co
109 expect_close = 42; 115 expect_close = 42;
110 } 116 }
111 } 117 }
112 /* Well, anyhow someone wrote to us, we should return that favour */ 118 /* Well, anyhow someone wrote to us, we should
119 return that favour */
113 wafwdt_ping(); 120 wafwdt_ping();
114 } 121 }
115 return count; 122 return count;
116} 123}
117 124
118static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 125static long wafwdt_ioctl(struct file *file, unsigned int cmd,
119 unsigned long arg) 126 unsigned long arg)
120{ 127{
121 int new_timeout; 128 int new_timeout;
122 void __user *argp = (void __user *)arg; 129 void __user *argp = (void __user *)arg;
123 int __user *p = argp; 130 int __user *p = argp;
124 static struct watchdog_info ident = { 131 static const struct watchdog_info ident = {
125 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, 132 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
133 WDIOF_MAGICCLOSE,
126 .firmware_version = 1, 134 .firmware_version = 1,
127 .identity = "Wafer 5823 WDT", 135 .identity = "Wafer 5823 WDT",
128 }; 136 };
129 137
130 switch (cmd) { 138 switch (cmd) {
131 case WDIOC_GETSUPPORT: 139 case WDIOC_GETSUPPORT:
132 if (copy_to_user(argp, &ident, sizeof (ident))) 140 if (copy_to_user(argp, &ident, sizeof(ident)))
133 return -EFAULT; 141 return -EFAULT;
134 break; 142 break;
135 143
@@ -194,10 +202,11 @@ static int wafwdt_open(struct inode *inode, struct file *file)
194static int 202static int
195wafwdt_close(struct inode *inode, struct file *file) 203wafwdt_close(struct inode *inode, struct file *file)
196{ 204{
197 if (expect_close == 42) { 205 if (expect_close == 42)
198 wafwdt_stop(); 206 wafwdt_stop();
199 } else { 207 else {
200 printk(KERN_CRIT PFX "WDT device closed unexpectedly. WDT will not stop!\n"); 208 printk(KERN_CRIT PFX
209 "WDT device closed unexpectedly. WDT will not stop!\n");
201 wafwdt_ping(); 210 wafwdt_ping();
202 } 211 }
203 clear_bit(0, &wafwdt_is_open); 212 clear_bit(0, &wafwdt_is_open);
@@ -209,12 +218,11 @@ wafwdt_close(struct inode *inode, struct file *file)
209 * Notifier for system down 218 * Notifier for system down
210 */ 219 */
211 220
212static int wafwdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) 221static int wafwdt_notify_sys(struct notifier_block *this, unsigned long code,
222 void *unused)
213{ 223{
214 if (code == SYS_DOWN || code == SYS_HALT) { 224 if (code == SYS_DOWN || code == SYS_HALT)
215 /* Turn the WDT off */
216 wafwdt_stop(); 225 wafwdt_stop();
217 }
218 return NOTIFY_DONE; 226 return NOTIFY_DONE;
219} 227}
220 228
@@ -226,7 +234,7 @@ static const struct file_operations wafwdt_fops = {
226 .owner = THIS_MODULE, 234 .owner = THIS_MODULE,
227 .llseek = no_llseek, 235 .llseek = no_llseek,
228 .write = wafwdt_write, 236 .write = wafwdt_write,
229 .ioctl = wafwdt_ioctl, 237 .unlocked_ioctl = wafwdt_ioctl,
230 .open = wafwdt_open, 238 .open = wafwdt_open,
231 .release = wafwdt_close, 239 .release = wafwdt_close,
232}; 240};
@@ -250,25 +258,28 @@ static int __init wafwdt_init(void)
250{ 258{
251 int ret; 259 int ret;
252 260
253 printk(KERN_INFO "WDT driver for Wafer 5823 single board computer initialising.\n"); 261 printk(KERN_INFO
262 "WDT driver for Wafer 5823 single board computer initialising.\n");
254 263
255 if (timeout < 1 || timeout > 255) { 264 if (timeout < 1 || timeout > 255) {
256 timeout = WD_TIMO; 265 timeout = WD_TIMO;
257 printk (KERN_INFO PFX "timeout value must be 1<=x<=255, using %d\n", 266 printk(KERN_INFO PFX
258 timeout); 267 "timeout value must be 1 <= x <= 255, using %d\n",
268 timeout);
259 } 269 }
260 270
261 if (wdt_stop != wdt_start) { 271 if (wdt_stop != wdt_start) {
262 if(!request_region(wdt_stop, 1, "Wafer 5823 WDT")) { 272 if (!request_region(wdt_stop, 1, "Wafer 5823 WDT")) {
263 printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", 273 printk(KERN_ERR PFX
264 wdt_stop); 274 "I/O address 0x%04x already in use\n",
275 wdt_stop);
265 ret = -EIO; 276 ret = -EIO;
266 goto error; 277 goto error;
267 } 278 }
268 } 279 }
269 280
270 if(!request_region(wdt_start, 1, "Wafer 5823 WDT")) { 281 if (!request_region(wdt_start, 1, "Wafer 5823 WDT")) {
271 printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", 282 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
272 wdt_start); 283 wdt_start);
273 ret = -EIO; 284 ret = -EIO;
274 goto error2; 285 goto error2;
@@ -276,19 +287,20 @@ static int __init wafwdt_init(void)
276 287
277 ret = register_reboot_notifier(&wafwdt_notifier); 288 ret = register_reboot_notifier(&wafwdt_notifier);
278 if (ret != 0) { 289 if (ret != 0) {
279 printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", 290 printk(KERN_ERR PFX
280 ret); 291 "cannot register reboot notifier (err=%d)\n", ret);
281 goto error3; 292 goto error3;
282 } 293 }
283 294
284 ret = misc_register(&wafwdt_miscdev); 295 ret = misc_register(&wafwdt_miscdev);
285 if (ret != 0) { 296 if (ret != 0) {
286 printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 297 printk(KERN_ERR PFX
287 WATCHDOG_MINOR, ret); 298 "cannot register miscdev on minor=%d (err=%d)\n",
299 WATCHDOG_MINOR, ret);
288 goto error4; 300 goto error4;
289 } 301 }
290 302
291 printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n", 303 printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
292 timeout, nowayout); 304 timeout, nowayout);
293 305
294 return ret; 306 return ret;
@@ -307,7 +319,7 @@ static void __exit wafwdt_exit(void)
307{ 319{
308 misc_deregister(&wafwdt_miscdev); 320 misc_deregister(&wafwdt_miscdev);
309 unregister_reboot_notifier(&wafwdt_notifier); 321 unregister_reboot_notifier(&wafwdt_notifier);
310 if(wdt_stop != wdt_start) 322 if (wdt_stop != wdt_start)
311 release_region(wdt_stop, 1); 323 release_region(wdt_stop, 1);
312 release_region(wdt_start, 1); 324 release_region(wdt_start, 1);
313} 325}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-21 11:51:52 -0500