aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/watchdog/alim1535_wdt.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/watchdog/alim1535_wdt.c')
-rw-r--r--drivers/watchdog/alim1535_wdt.c186
1 files changed, 91 insertions, 95 deletions
diff --git a/drivers/watchdog/alim1535_wdt.c b/drivers/watchdog/alim1535_wdt.c
index 2b1fbdb2fcf7..88760cb5ec13 100644
--- a/drivers/watchdog/alim1535_wdt.c
+++ b/drivers/watchdog/alim1535_wdt.c
@@ -19,8 +19,8 @@
19#include <linux/fs.h> 19#include <linux/fs.h>
20#include <linux/pci.h> 20#include <linux/pci.h>
21 21
22#include <asm/uaccess.h> 22#include <linux/uaccess.h>
23#include <asm/io.h> 23#include <linux/io.h>
24 24
25#define WATCHDOG_NAME "ALi_M1535" 25#define WATCHDOG_NAME "ALi_M1535"
26#define PFX WATCHDOG_NAME ": " 26#define PFX WATCHDOG_NAME ": "
@@ -30,17 +30,21 @@
30static unsigned long ali_is_open; 30static unsigned long ali_is_open;
31static char ali_expect_release; 31static char ali_expect_release;
32static struct pci_dev *ali_pci; 32static struct pci_dev *ali_pci;
33static u32 ali_timeout_bits; /* stores the computed timeout */ 33static u32 ali_timeout_bits; /* stores the computed timeout */
34static DEFINE_SPINLOCK(ali_lock); /* Guards the hardware */ 34static DEFINE_SPINLOCK(ali_lock); /* Guards the hardware */
35 35
36/* module parameters */ 36/* module parameters */
37static int timeout = WATCHDOG_TIMEOUT; 37static int timeout = WATCHDOG_TIMEOUT;
38module_param(timeout, int, 0); 38module_param(timeout, int, 0);
39MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (0<timeout<18000, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); 39MODULE_PARM_DESC(timeout,
40 "Watchdog timeout in seconds. (0 < timeout < 18000, default="
41 __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
40 42
41static int nowayout = WATCHDOG_NOWAYOUT; 43static int nowayout = WATCHDOG_NOWAYOUT;
42module_param(nowayout, int, 0); 44module_param(nowayout, int, 0);
43MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 45MODULE_PARM_DESC(nowayout,
46 "Watchdog cannot be stopped once started (default="
47 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
44 48
45/* 49/*
46 * ali_start - start watchdog countdown 50 * ali_start - start watchdog countdown
@@ -103,15 +107,16 @@ static void ali_keepalive(void)
103 107
104static int ali_settimer(int t) 108static int ali_settimer(int t)
105{ 109{
106 if(t < 0) 110 if (t < 0)
107 return -EINVAL; 111 return -EINVAL;
108 else if(t < 60) 112 else if (t < 60)
109 ali_timeout_bits = t|(1<<6); 113 ali_timeout_bits = t|(1<<6);
110 else if(t < 3600) 114 else if (t < 3600)
111 ali_timeout_bits = (t/60)|(1<<7); 115 ali_timeout_bits = (t/60)|(1<<7);
112 else if(t < 18000) 116 else if (t < 18000)
113 ali_timeout_bits = (t/300)|(1<<6)|(1<<7); 117 ali_timeout_bits = (t/300)|(1<<6)|(1<<7);
114 else return -EINVAL; 118 else
119 return -EINVAL;
115 120
116 timeout = t; 121 timeout = t;
117 return 0; 122 return 0;
@@ -134,21 +139,22 @@ static int ali_settimer(int t)
134 */ 139 */
135 140
136static ssize_t ali_write(struct file *file, const char __user *data, 141static ssize_t ali_write(struct file *file, const char __user *data,
137 size_t len, loff_t * ppos) 142 size_t len, loff_t *ppos)
138{ 143{
139 /* See if we got the magic character 'V' and reload the timer */ 144 /* See if we got the magic character 'V' and reload the timer */
140 if (len) { 145 if (len) {
141 if (!nowayout) { 146 if (!nowayout) {
142 size_t i; 147 size_t i;
143 148
144 /* note: just in case someone wrote the magic character 149 /* note: just in case someone wrote the
145 * five months ago... */ 150 magic character five months ago... */
146 ali_expect_release = 0; 151 ali_expect_release = 0;
147 152
148 /* scan to see whether or not we got the magic character */ 153 /* scan to see whether or not we got
154 the magic character */
149 for (i = 0; i != len; i++) { 155 for (i = 0; i != len; i++) {
150 char c; 156 char c;
151 if(get_user(c, data+i)) 157 if (get_user(c, data+i))
152 return -EFAULT; 158 return -EFAULT;
153 if (c == 'V') 159 if (c == 'V')
154 ali_expect_release = 42; 160 ali_expect_release = 42;
@@ -163,7 +169,6 @@ static ssize_t ali_write(struct file *file, const char __user *data,
163 169
164/* 170/*
165 * ali_ioctl - handle watchdog ioctls 171 * ali_ioctl - handle watchdog ioctls
166 * @inode: VFS inode
167 * @file: VFS file pointer 172 * @file: VFS file pointer
168 * @cmd: ioctl number 173 * @cmd: ioctl number
169 * @arg: arguments to the ioctl 174 * @arg: arguments to the ioctl
@@ -172,8 +177,7 @@ static ssize_t ali_write(struct file *file, const char __user *data,
172 * we want an extension to enable irq ack monitoring and the like 177 * we want an extension to enable irq ack monitoring and the like
173 */ 178 */
174 179
175static int ali_ioctl(struct inode *inode, struct file *file, 180static long ali_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
176 unsigned int cmd, unsigned long arg)
177{ 181{
178 void __user *argp = (void __user *)arg; 182 void __user *argp = (void __user *)arg;
179 int __user *p = argp; 183 int __user *p = argp;
@@ -186,57 +190,45 @@ static int ali_ioctl(struct inode *inode, struct file *file,
186 }; 190 };
187 191
188 switch (cmd) { 192 switch (cmd) {
189 case WDIOC_GETSUPPORT: 193 case WDIOC_GETSUPPORT:
190 return copy_to_user(argp, &ident, 194 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
191 sizeof (ident)) ? -EFAULT : 0;
192
193 case WDIOC_GETSTATUS:
194 case WDIOC_GETBOOTSTATUS:
195 return put_user(0, p);
196
197 case WDIOC_KEEPALIVE:
198 ali_keepalive();
199 return 0;
200
201 case WDIOC_SETOPTIONS:
202 {
203 int new_options, retval = -EINVAL;
204
205 if (get_user (new_options, p))
206 return -EFAULT;
207
208 if (new_options & WDIOS_DISABLECARD) {
209 ali_stop();
210 retval = 0;
211 }
212
213 if (new_options & WDIOS_ENABLECARD) {
214 ali_start();
215 retval = 0;
216 }
217 195
218 return retval; 196 case WDIOC_GETSTATUS:
197 case WDIOC_GETBOOTSTATUS:
198 return put_user(0, p);
199 case WDIOC_KEEPALIVE:
200 ali_keepalive();
201 return 0;
202 case WDIOC_SETOPTIONS:
203 {
204 int new_options, retval = -EINVAL;
205
206 if (get_user(new_options, p))
207 return -EFAULT;
208 if (new_options & WDIOS_DISABLECARD) {
209 ali_stop();
210 retval = 0;
219 } 211 }
220 212 if (new_options & WDIOS_ENABLECARD) {
221 case WDIOC_SETTIMEOUT: 213 ali_start();
222 { 214 retval = 0;
223 int new_timeout;
224
225 if (get_user(new_timeout, p))
226 return -EFAULT;
227
228 if (ali_settimer(new_timeout))
229 return -EINVAL;
230
231 ali_keepalive();
232 /* Fall */
233 } 215 }
234 216 return retval;
235 case WDIOC_GETTIMEOUT: 217 }
236 return put_user(timeout, p); 218 case WDIOC_SETTIMEOUT:
237 219 {
238 default: 220 int new_timeout;
239 return -ENOTTY; 221 if (get_user(new_timeout, p))
222 return -EFAULT;
223 if (ali_settimer(new_timeout))
224 return -EINVAL;
225 ali_keepalive();
226 /* Fall */
227 }
228 case WDIOC_GETTIMEOUT:
229 return put_user(timeout, p);
230 default:
231 return -ENOTTY;
240 } 232 }
241} 233}
242 234
@@ -274,10 +266,11 @@ static int ali_release(struct inode *inode, struct file *file)
274 /* 266 /*
275 * Shut off the timer. 267 * Shut off the timer.
276 */ 268 */
277 if (ali_expect_release == 42) { 269 if (ali_expect_release == 42)
278 ali_stop(); 270 ali_stop();
279 } else { 271 else {
280 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); 272 printk(KERN_CRIT PFX
273 "Unexpected close, not stopping watchdog!\n");
281 ali_keepalive(); 274 ali_keepalive();
282 } 275 }
283 clear_bit(0, &ali_is_open); 276 clear_bit(0, &ali_is_open);
@@ -292,13 +285,11 @@ static int ali_release(struct inode *inode, struct file *file)
292 */ 285 */
293 286
294 287
295static int ali_notify_sys(struct notifier_block *this, unsigned long code, void *unused) 288static int ali_notify_sys(struct notifier_block *this,
289 unsigned long code, void *unused)
296{ 290{
297 if (code==SYS_DOWN || code==SYS_HALT) { 291 if (code == SYS_DOWN || code == SYS_HALT)
298 /* Turn the WDT off */ 292 ali_stop(); /* Turn the WDT off */
299 ali_stop();
300 }
301
302 return NOTIFY_DONE; 293 return NOTIFY_DONE;
303} 294}
304 295
@@ -340,10 +331,10 @@ static int __init ali_find_watchdog(void)
340 331
341 /* Check for the a 7101 PMU */ 332 /* Check for the a 7101 PMU */
342 pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x7101, NULL); 333 pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x7101, NULL);
343 if(pdev == NULL) 334 if (pdev == NULL)
344 return -ENODEV; 335 return -ENODEV;
345 336
346 if(pci_enable_device(pdev)) { 337 if (pci_enable_device(pdev)) {
347 pci_dev_put(pdev); 338 pci_dev_put(pdev);
348 return -EIO; 339 return -EIO;
349 } 340 }
@@ -355,9 +346,12 @@ static int __init ali_find_watchdog(void)
355 */ 346 */
356 pci_read_config_dword(pdev, 0xCC, &wdog); 347 pci_read_config_dword(pdev, 0xCC, &wdog);
357 348
358 wdog &= ~0x3F; /* Timer bits */ 349 /* Timer bits */
359 wdog &= ~((1<<27)|(1<<26)|(1<<25)|(1<<24)); /* Issued events */ 350 wdog &= ~0x3F;
360 wdog &= ~((1<<16)|(1<<13)|(1<<12)|(1<<11)|(1<<10)|(1<<9)); /* No monitor bits */ 351 /* Issued events */
352 wdog &= ~((1<<27)|(1<<26)|(1<<25)|(1<<24));
353 /* No monitor bits */
354 wdog &= ~((1<<16)|(1<<13)|(1<<12)|(1<<11)|(1<<10)|(1<<9));
361 355
362 pci_write_config_dword(pdev, 0xCC, wdog); 356 pci_write_config_dword(pdev, 0xCC, wdog);
363 357
@@ -369,12 +363,12 @@ static int __init ali_find_watchdog(void)
369 */ 363 */
370 364
371static const struct file_operations ali_fops = { 365static const struct file_operations ali_fops = {
372 .owner = THIS_MODULE, 366 .owner = THIS_MODULE,
373 .llseek = no_llseek, 367 .llseek = no_llseek,
374 .write = ali_write, 368 .write = ali_write,
375 .ioctl = ali_ioctl, 369 .unlocked_ioctl = ali_ioctl,
376 .open = ali_open, 370 .open = ali_open,
377 .release = ali_release, 371 .release = ali_release,
378}; 372};
379 373
380static struct miscdevice ali_miscdev = { 374static struct miscdevice ali_miscdev = {
@@ -399,15 +393,16 @@ static int __init watchdog_init(void)
399 int ret; 393 int ret;
400 394
401 /* Check whether or not the hardware watchdog is there */ 395 /* Check whether or not the hardware watchdog is there */
402 if (ali_find_watchdog() != 0) { 396 if (ali_find_watchdog() != 0)
403 return -ENODEV; 397 return -ENODEV;
404 }
405 398
406 /* Check that the timeout value is within it's range ; if not reset to the default */ 399 /* Check that the timeout value is within it's range;
400 if not reset to the default */
407 if (timeout < 1 || timeout >= 18000) { 401 if (timeout < 1 || timeout >= 18000) {
408 timeout = WATCHDOG_TIMEOUT; 402 timeout = WATCHDOG_TIMEOUT;
409 printk(KERN_INFO PFX "timeout value must be 0<timeout<18000, using %d\n", 403 printk(KERN_INFO PFX
410 timeout); 404 "timeout value must be 0 < timeout < 18000, using %d\n",
405 timeout);
411 } 406 }
412 407
413 /* Calculate the watchdog's timeout */ 408 /* Calculate the watchdog's timeout */
@@ -415,15 +410,16 @@ static int __init watchdog_init(void)
415 410
416 ret = register_reboot_notifier(&ali_notifier); 411 ret = register_reboot_notifier(&ali_notifier);
417 if (ret != 0) { 412 if (ret != 0) {
418 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", 413 printk(KERN_ERR PFX
419 ret); 414 "cannot register reboot notifier (err=%d)\n", ret);
420 goto out; 415 goto out;
421 } 416 }
422 417
423 ret = misc_register(&ali_miscdev); 418 ret = misc_register(&ali_miscdev);
424 if (ret != 0) { 419 if (ret != 0) {
425 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 420 printk(KERN_ERR PFX
426 WATCHDOG_MINOR, ret); 421 "cannot register miscdev on minor=%d (err=%d)\n",
422 WATCHDOG_MINOR, ret);
427 goto unreg_reboot; 423 goto unreg_reboot;
428 } 424 }
429 425