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path: root/drivers/watchdog/acquirewdt.c
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Diffstat (limited to 'drivers/watchdog/acquirewdt.c')
-rw-r--r--drivers/watchdog/acquirewdt.c130
1 files changed, 63 insertions, 67 deletions
diff --git a/drivers/watchdog/acquirewdt.c b/drivers/watchdog/acquirewdt.c
index 85269c365a10..6e46a551395c 100644
--- a/drivers/watchdog/acquirewdt.c
+++ b/drivers/watchdog/acquirewdt.c
@@ -58,39 +58,45 @@
58#include <linux/types.h> /* For standard types (like size_t) */ 58#include <linux/types.h> /* For standard types (like size_t) */
59#include <linux/errno.h> /* For the -ENODEV/... values */ 59#include <linux/errno.h> /* For the -ENODEV/... values */
60#include <linux/kernel.h> /* For printk/panic/... */ 60#include <linux/kernel.h> /* For printk/panic/... */
61#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ 61#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
62 (WATCHDOG_MINOR) */
62#include <linux/watchdog.h> /* For the watchdog specific items */ 63#include <linux/watchdog.h> /* For the watchdog specific items */
63#include <linux/fs.h> /* For file operations */ 64#include <linux/fs.h> /* For file operations */
64#include <linux/ioport.h> /* For io-port access */ 65#include <linux/ioport.h> /* For io-port access */
65#include <linux/platform_device.h> /* For platform_driver framework */ 66#include <linux/platform_device.h> /* For platform_driver framework */
66#include <linux/init.h> /* For __init/__exit/... */ 67#include <linux/init.h> /* For __init/__exit/... */
67 68#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
68#include <asm/uaccess.h> /* For copy_to_user/put_user/... */ 69#include <linux/io.h> /* For inb/outb/... */
69#include <asm/io.h> /* For inb/outb/... */
70 70
71/* Module information */ 71/* Module information */
72#define DRV_NAME "acquirewdt" 72#define DRV_NAME "acquirewdt"
73#define PFX DRV_NAME ": " 73#define PFX DRV_NAME ": "
74#define WATCHDOG_NAME "Acquire WDT" 74#define WATCHDOG_NAME "Acquire WDT"
75#define WATCHDOG_HEARTBEAT 0 /* There is no way to see what the correct time-out period is */ 75/* There is no way to see what the correct time-out period is */
76#define WATCHDOG_HEARTBEAT 0
76 77
77/* internal variables */ 78/* internal variables */
78static struct platform_device *acq_platform_device; /* the watchdog platform device */ 79/* the watchdog platform device */
80static struct platform_device *acq_platform_device;
79static unsigned long acq_is_open; 81static unsigned long acq_is_open;
80static char expect_close; 82static char expect_close;
81 83
82/* module parameters */ 84/* module parameters */
83static int wdt_stop = 0x43; /* You must set this - there is no sane way to probe for this board. */ 85/* You must set this - there is no sane way to probe for this board. */
86static int wdt_stop = 0x43;
84module_param(wdt_stop, int, 0); 87module_param(wdt_stop, int, 0);
85MODULE_PARM_DESC(wdt_stop, "Acquire WDT 'stop' io port (default 0x43)"); 88MODULE_PARM_DESC(wdt_stop, "Acquire WDT 'stop' io port (default 0x43)");
86 89
87static int wdt_start = 0x443; /* You must set this - there is no sane way to probe for this board. */ 90/* You must set this - there is no sane way to probe for this board. */
91static int wdt_start = 0x443;
88module_param(wdt_start, int, 0); 92module_param(wdt_start, int, 0);
89MODULE_PARM_DESC(wdt_start, "Acquire WDT 'start' io port (default 0x443)"); 93MODULE_PARM_DESC(wdt_start, "Acquire WDT 'start' io port (default 0x443)");
90 94
91static int nowayout = WATCHDOG_NOWAYOUT; 95static int nowayout = WATCHDOG_NOWAYOUT;
92module_param(nowayout, int, 0); 96module_param(nowayout, int, 0);
93MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 97MODULE_PARM_DESC(nowayout,
98 "Watchdog cannot be stopped once started (default="
99 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
94 100
95/* 101/*
96 * Watchdog Operations 102 * Watchdog Operations
@@ -112,18 +118,18 @@ static void acq_stop(void)
112 * /dev/watchdog handling 118 * /dev/watchdog handling
113 */ 119 */
114 120
115static ssize_t acq_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 121static ssize_t acq_write(struct file *file, const char __user *buf,
122 size_t count, loff_t *ppos)
116{ 123{
117 /* See if we got the magic character 'V' and reload the timer */ 124 /* See if we got the magic character 'V' and reload the timer */
118 if(count) { 125 if (count) {
119 if (!nowayout) { 126 if (!nowayout) {
120 size_t i; 127 size_t i;
121
122 /* note: just in case someone wrote the magic character 128 /* note: just in case someone wrote the magic character
123 * five months ago... */ 129 five months ago... */
124 expect_close = 0; 130 expect_close = 0;
125 131 /* scan to see whether or not we got the
126 /* scan to see whether or not we got the magic character */ 132 magic character */
127 for (i = 0; i != count; i++) { 133 for (i = 0; i != count; i++) {
128 char c; 134 char c;
129 if (get_user(c, buf + i)) 135 if (get_user(c, buf + i))
@@ -132,64 +138,55 @@ static ssize_t acq_write(struct file *file, const char __user *buf, size_t count
132 expect_close = 42; 138 expect_close = 42;
133 } 139 }
134 } 140 }
135 141 /* Well, anyhow someone wrote to us, we should
136 /* Well, anyhow someone wrote to us, we should return that favour */ 142 return that favour */
137 acq_keepalive(); 143 acq_keepalive();
138 } 144 }
139 return count; 145 return count;
140} 146}
141 147
142static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 148static long acq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
143 unsigned long arg)
144{ 149{
145 int options, retval = -EINVAL; 150 int options, retval = -EINVAL;
146 void __user *argp = (void __user *)arg; 151 void __user *argp = (void __user *)arg;
147 int __user *p = argp; 152 int __user *p = argp;
148 static struct watchdog_info ident = 153 static struct watchdog_info ident = {
149 {
150 .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, 154 .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
151 .firmware_version = 1, 155 .firmware_version = 1,
152 .identity = WATCHDOG_NAME, 156 .identity = WATCHDOG_NAME,
153 }; 157 };
154 158
155 switch(cmd) 159 switch (cmd) {
156 {
157 case WDIOC_GETSUPPORT: 160 case WDIOC_GETSUPPORT:
158 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; 161 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
159 162
160 case WDIOC_GETSTATUS: 163 case WDIOC_GETSTATUS:
161 case WDIOC_GETBOOTSTATUS: 164 case WDIOC_GETBOOTSTATUS:
162 return put_user(0, p); 165 return put_user(0, p);
163
164 case WDIOC_KEEPALIVE:
165 acq_keepalive();
166 return 0;
167
168 case WDIOC_GETTIMEOUT:
169 return put_user(WATCHDOG_HEARTBEAT, p);
170 166
171 case WDIOC_SETOPTIONS: 167 case WDIOC_SETOPTIONS:
172 { 168 {
173 if (get_user(options, p)) 169 if (get_user(options, p))
174 return -EFAULT; 170 return -EFAULT;
175 171 if (options & WDIOS_DISABLECARD) {
176 if (options & WDIOS_DISABLECARD) 172 acq_stop();
177 { 173 retval = 0;
178 acq_stop(); 174 }
179 retval = 0; 175 if (options & WDIOS_ENABLECARD) {
180 } 176 acq_keepalive();
181 177 retval = 0;
182 if (options & WDIOS_ENABLECARD) 178 }
183 { 179 return retval;
184 acq_keepalive();
185 retval = 0;
186 }
187
188 return retval;
189 } 180 }
181 case WDIOC_KEEPALIVE:
182 acq_keepalive();
183 return 0;
184
185 case WDIOC_GETTIMEOUT:
186 return put_user(WATCHDOG_HEARTBEAT, p);
190 187
191 default: 188 default:
192 return -ENOTTY; 189 return -ENOTTY;
193 } 190 }
194} 191}
195 192
@@ -211,7 +208,8 @@ static int acq_close(struct inode *inode, struct file *file)
211 if (expect_close == 42) { 208 if (expect_close == 42) {
212 acq_stop(); 209 acq_stop();
213 } else { 210 } else {
214 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); 211 printk(KERN_CRIT PFX
212 "Unexpected close, not stopping watchdog!\n");
215 acq_keepalive(); 213 acq_keepalive();
216 } 214 }
217 clear_bit(0, &acq_is_open); 215 clear_bit(0, &acq_is_open);
@@ -227,7 +225,7 @@ static const struct file_operations acq_fops = {
227 .owner = THIS_MODULE, 225 .owner = THIS_MODULE,
228 .llseek = no_llseek, 226 .llseek = no_llseek,
229 .write = acq_write, 227 .write = acq_write,
230 .ioctl = acq_ioctl, 228 .unlocked_ioctl = acq_ioctl,
231 .open = acq_open, 229 .open = acq_open,
232 .release = acq_close, 230 .release = acq_close,
233}; 231};
@@ -248,32 +246,29 @@ static int __devinit acq_probe(struct platform_device *dev)
248 246
249 if (wdt_stop != wdt_start) { 247 if (wdt_stop != wdt_start) {
250 if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) { 248 if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
251 printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", 249 printk(KERN_ERR PFX
252 wdt_stop); 250 "I/O address 0x%04x already in use\n", wdt_stop);
253 ret = -EIO; 251 ret = -EIO;
254 goto out; 252 goto out;
255 } 253 }
256 } 254 }
257 255
258 if (!request_region(wdt_start, 1, WATCHDOG_NAME)) { 256 if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
259 printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", 257 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
260 wdt_start); 258 wdt_start);
261 ret = -EIO; 259 ret = -EIO;
262 goto unreg_stop; 260 goto unreg_stop;
263 } 261 }
264
265 ret = misc_register(&acq_miscdev); 262 ret = misc_register(&acq_miscdev);
266 if (ret != 0) { 263 if (ret != 0) {
267 printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 264 printk(KERN_ERR PFX
268 WATCHDOG_MINOR, ret); 265 "cannot register miscdev on minor=%d (err=%d)\n",
266 WATCHDOG_MINOR, ret);
269 goto unreg_regions; 267 goto unreg_regions;
270 } 268 }
271 269 printk(KERN_INFO PFX "initialized. (nowayout=%d)\n", nowayout);
272 printk (KERN_INFO PFX "initialized. (nowayout=%d)\n",
273 nowayout);
274 270
275 return 0; 271 return 0;
276
277unreg_regions: 272unreg_regions:
278 release_region(wdt_start, 1); 273 release_region(wdt_start, 1);
279unreg_stop: 274unreg_stop:
@@ -286,9 +281,9 @@ out:
286static int __devexit acq_remove(struct platform_device *dev) 281static int __devexit acq_remove(struct platform_device *dev)
287{ 282{
288 misc_deregister(&acq_miscdev); 283 misc_deregister(&acq_miscdev);
289 release_region(wdt_start,1); 284 release_region(wdt_start, 1);
290 if(wdt_stop != wdt_start) 285 if (wdt_stop != wdt_start)
291 release_region(wdt_stop,1); 286 release_region(wdt_stop, 1);
292 287
293 return 0; 288 return 0;
294} 289}
@@ -313,18 +308,19 @@ static int __init acq_init(void)
313{ 308{
314 int err; 309 int err;
315 310
316 printk(KERN_INFO "WDT driver for Acquire single board computer initialising.\n"); 311 printk(KERN_INFO
312 "WDT driver for Acquire single board computer initialising.\n");
317 313
318 err = platform_driver_register(&acquirewdt_driver); 314 err = platform_driver_register(&acquirewdt_driver);
319 if (err) 315 if (err)
320 return err; 316 return err;
321 317
322 acq_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0); 318 acq_platform_device = platform_device_register_simple(DRV_NAME,
319 -1, NULL, 0);
323 if (IS_ERR(acq_platform_device)) { 320 if (IS_ERR(acq_platform_device)) {
324 err = PTR_ERR(acq_platform_device); 321 err = PTR_ERR(acq_platform_device);
325 goto unreg_platform_driver; 322 goto unreg_platform_driver;
326 } 323 }
327
328 return 0; 324 return 0;
329 325
330unreg_platform_driver: 326unreg_platform_driver: