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yaml
---
r: 107846
b: refs/heads/master
c: c1c8dd3
h: refs/heads/master
v: v3
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Alan Cox authored and Wim Van Sebroeck committed Jun 21, 2008
1 parent 8ab3848 commit 0100389
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Showing 2 changed files with 74 additions and 76 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 46a3949ddc422882cc27c88d078838cd31885d78
refs/heads/master: c1c8dd39f53e56d6a92aa6a2db9940d912d7ee4c
148 changes: 73 additions & 75 deletions trunk/drivers/watchdog/w83697hf_wdt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -36,9 +36,9 @@
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/uaccess.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>

#define WATCHDOG_NAME "w83697hf/hg WDT"
Expand All @@ -53,37 +53,43 @@ static DEFINE_SPINLOCK(io_lock);
/* You must set this - there is no sane way to probe for this board. */
static int wdt_io = 0x2e;
module_param(wdt_io, int, 0);
MODULE_PARM_DESC(wdt_io, "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)");
MODULE_PARM_DESC(wdt_io,
"w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)");

static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255 (default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
MODULE_PARM_DESC(timeout,
"Watchdog timeout in seconds. 1<= timeout <=255 (default="
__MODULE_STRING(WATCHDOG_TIMEOUT) ")");

static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

static int early_disable = WATCHDOG_EARLY_DISABLE;
module_param(early_disable, int, 0);
MODULE_PARM_DESC(early_disable, "Watchdog gets disabled at boot time (default=" __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")");
MODULE_PARM_DESC(early_disable,
"Watchdog gets disabled at boot time (default="
__MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")");

/*
* Kernel methods.
*/

#define W83697HF_EFER (wdt_io+0) /* Extended Function Enable Register */
#define W83697HF_EFIR (wdt_io+0) /* Extended Function Index Register (same as EFER) */
#define W83697HF_EFDR (wdt_io+1) /* Extended Function Data Register */
#define W83697HF_EFER (wdt_io + 0) /* Extended Function Enable Register */
#define W83697HF_EFIR (wdt_io + 0) /* Extended Function Index Register
(same as EFER) */
#define W83697HF_EFDR (wdt_io + 1) /* Extended Function Data Register */

static inline void
w83697hf_unlock(void)
static inline void w83697hf_unlock(void)
{
outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */
outb_p(0x87, W83697HF_EFER); /* Again according to manual */
}

static inline void
w83697hf_lock(void)
static inline void w83697hf_lock(void)
{
outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */
}
Expand All @@ -93,41 +99,36 @@ w83697hf_lock(void)
* w83697hf_write_timeout() must be called with the device unlocked.
*/

static unsigned char
w83697hf_get_reg(unsigned char reg)
static unsigned char w83697hf_get_reg(unsigned char reg)
{
outb_p(reg, W83697HF_EFIR);
return inb_p(W83697HF_EFDR);
}

static void
w83697hf_set_reg(unsigned char reg, unsigned char data)
static void w83697hf_set_reg(unsigned char reg, unsigned char data)
{
outb_p(reg, W83697HF_EFIR);
outb_p(data, W83697HF_EFDR);
}

static void
w83697hf_write_timeout(int timeout)
static void w83697hf_write_timeout(int timeout)
{
w83697hf_set_reg(0xF4, timeout); /* Write Timeout counter to CRF4 */
/* Write Timeout counter to CRF4 */
w83697hf_set_reg(0xF4, timeout);
}

static void
w83697hf_select_wdt(void)
static void w83697hf_select_wdt(void)
{
w83697hf_unlock();
w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */
}

static inline void
w83697hf_deselect_wdt(void)
static inline void w83697hf_deselect_wdt(void)
{
w83697hf_lock();
}

static void
w83697hf_init(void)
static void w83697hf_init(void)
{
unsigned char bbuf;

Expand All @@ -136,7 +137,9 @@ w83697hf_init(void)
bbuf = w83697hf_get_reg(0x29);
bbuf &= ~0x60;
bbuf |= 0x20;
w83697hf_set_reg(0x29, bbuf); /* Set pin 119 to WDTO# mode (= CR29, WDT0) */

/* Set pin 119 to WDTO# mode (= CR29, WDT0) */
w83697hf_set_reg(0x29, bbuf);

bbuf = w83697hf_get_reg(0xF3);
bbuf &= ~0x04;
Expand All @@ -145,8 +148,7 @@ w83697hf_init(void)
w83697hf_deselect_wdt();
}

static void
wdt_ping(void)
static void wdt_ping(void)
{
spin_lock(&io_lock);
w83697hf_select_wdt();
Expand All @@ -157,8 +159,7 @@ wdt_ping(void)
spin_unlock(&io_lock);
}

static void
wdt_enable(void)
static void wdt_enable(void)
{
spin_lock(&io_lock);
w83697hf_select_wdt();
Expand All @@ -170,8 +171,7 @@ wdt_enable(void)
spin_unlock(&io_lock);
}

static void
wdt_disable(void)
static void wdt_disable(void)
{
spin_lock(&io_lock);
w83697hf_select_wdt();
Expand All @@ -183,8 +183,7 @@ wdt_disable(void)
spin_unlock(&io_lock);
}

static unsigned char
wdt_running(void)
static unsigned char wdt_running(void)
{
unsigned char t;

Expand All @@ -199,18 +198,17 @@ wdt_running(void)
return t;
}

static int
wdt_set_heartbeat(int t)
static int wdt_set_heartbeat(int t)
{
if ((t < 1) || (t > 255))
if (t < 1 || t > 255)
return -EINVAL;

timeout = t;
return 0;
}

static ssize_t
wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
static ssize_t wdt_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
if (count) {
if (!nowayout) {
Expand All @@ -231,15 +229,14 @@ wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
return count;
}

static int
wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_timeout;
static struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
static const struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
| WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "W83697HF WDT",
};
Expand Down Expand Up @@ -295,8 +292,7 @@ wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
return 0;
}

static int
wdt_open(struct inode *inode, struct file *file)
static int wdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &wdt_is_open))
return -EBUSY;
Expand All @@ -308,13 +304,13 @@ wdt_open(struct inode *inode, struct file *file)
return nonseekable_open(inode, file);
}

static int
wdt_close(struct inode *inode, struct file *file)
static int wdt_close(struct inode *inode, struct file *file)
{
if (expect_close == 42) {
if (expect_close == 42)
wdt_disable();
} else {
printk (KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
else {
printk(KERN_CRIT PFX
"Unexpected close, not stopping watchdog!\n");
wdt_ping();
}
expect_close = 0;
Expand All @@ -326,8 +322,7 @@ wdt_close(struct inode *inode, struct file *file)
* Notifier for system down
*/

static int
wdt_notify_sys(struct notifier_block *this, unsigned long code,
static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
if (code == SYS_DOWN || code == SYS_HALT) {
Expand All @@ -345,7 +340,7 @@ static const struct file_operations wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = wdt_write,
.ioctl = wdt_ioctl,
.unlocked_ioctl = wdt_ioctl,
.open = wdt_open,
.release = wdt_close,
};
Expand All @@ -365,36 +360,38 @@ static struct notifier_block wdt_notifier = {
.notifier_call = wdt_notify_sys,
};

static int
w83697hf_check_wdt(void)
static int w83697hf_check_wdt(void)
{
if (!request_region(wdt_io, 2, WATCHDOG_NAME)) {
printk (KERN_ERR PFX "I/O address 0x%x already in use\n", wdt_io);
printk(KERN_ERR PFX
"I/O address 0x%x already in use\n", wdt_io);
return -EIO;
}

printk (KERN_DEBUG PFX "Looking for watchdog at address 0x%x\n", wdt_io);
printk(KERN_DEBUG PFX
"Looking for watchdog at address 0x%x\n", wdt_io);
w83697hf_unlock();
if (w83697hf_get_reg(0x20) == 0x60) {
printk (KERN_INFO PFX "watchdog found at address 0x%x\n", wdt_io);
printk(KERN_INFO PFX
"watchdog found at address 0x%x\n", wdt_io);
w83697hf_lock();
return 0;
}
w83697hf_lock(); /* Reprotect in case it was a compatible device */
/* Reprotect in case it was a compatible device */
w83697hf_lock();

printk (KERN_INFO PFX "watchdog not found at address 0x%x\n", wdt_io);
printk(KERN_INFO PFX "watchdog not found at address 0x%x\n", wdt_io);
release_region(wdt_io, 2);
return -EIO;
}

static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 };

static int __init
wdt_init(void)
static int __init wdt_init(void)
{
int ret, i, found = 0;

printk (KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n");
printk(KERN_INFO PFX "WDT driver for W83697HF/HG initializing\n");

if (wdt_io == 0) {
/* we will autodetect the W83697HF/HG watchdog */
Expand All @@ -409,7 +406,7 @@ wdt_init(void)
}

if (!found) {
printk (KERN_ERR PFX "No W83697HF/HG could be found\n");
printk(KERN_ERR PFX "No W83697HF/HG could be found\n");
ret = -EIO;
goto out;
}
Expand All @@ -423,25 +420,27 @@ wdt_init(void)

if (wdt_set_heartbeat(timeout)) {
wdt_set_heartbeat(WATCHDOG_TIMEOUT);
printk (KERN_INFO PFX "timeout value must be 1<=timeout<=255, using %d\n",
WATCHDOG_TIMEOUT);
printk(KERN_INFO PFX
"timeout value must be 1 <= timeout <= 255, using %d\n",
WATCHDOG_TIMEOUT);
}

ret = register_reboot_notifier(&wdt_notifier);
if (ret != 0) {
printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
ret);
printk(KERN_ERR PFX
"cannot register reboot notifier (err=%d)\n", ret);
goto unreg_regions;
}

ret = misc_register(&wdt_miscdev);
if (ret != 0) {
printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
printk(KERN_ERR PFX
"cannot register miscdev on minor=%d (err=%d)\n",
WATCHDOG_MINOR, ret);
goto unreg_reboot;
}

printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
timeout, nowayout);

out:
Expand All @@ -453,8 +452,7 @@ wdt_init(void)
goto out;
}

static void __exit
wdt_exit(void)
static void __exit wdt_exit(void)
{
misc_deregister(&wdt_miscdev);
unregister_reboot_notifier(&wdt_notifier);
Expand Down

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