lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[WATCHDOG 52/57] w83977f_wdt: clean up, coding style and switch to unlocked_ioctl

Browse Source 
Review and switch to unlocked_ioctl

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Alan Cox
2008-05-19 14:09:34 +01:00
committed by Wim Van Sebroeck
parent c1cfd1a2ff
commit 84af401af8
1 changed files with 111 additions and 114 deletions
Download Patch File Download Diff File Expand all files Collapse all files

215
drivers/watchdog/w83977f_wdt.c
View File

@@ -26,10 +26,10 @@
#include <linux/watchdog.h> #include <linux/watchdog.h>
#include <linux/notifier.h> #include <linux/notifier.h>
#include <linux/reboot.h> #include <linux/reboot.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/io.h>
#include <asm/system.h> #include <asm/system.h>
#include <asm/uaccess.h>
#define WATCHDOG_VERSION "1.00" #define WATCHDOG_VERSION "1.00"
#define WATCHDOG_NAME "W83977F WDT" #define WATCHDOG_NAME "W83977F WDT"
@@ -53,13 +53,17 @@ static char expect_close;
static DEFINE_SPINLOCK(spinlock); static DEFINE_SPINLOCK(spinlock);
module_param(timeout, int, 0); module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout,"Watchdog timeout in seconds (15..7635), default=" __MODULE_STRING(DEFAULT_TIMEOUT) ")"); MODULE_PARM_DESC(timeout,
"Watchdog timeout in seconds (15..7635), default="
__MODULE_STRING(DEFAULT_TIMEOUT) ")");
module_param(testmode, int, 0); module_param(testmode, int, 0);
MODULE_PARM_DESC(testmode,"Watchdog testmode (1 = no reboot), default=0"); MODULE_PARM_DESC(testmode, "Watchdog testmode (1 = no reboot), default=0");
static int nowayout = WATCHDOG_NOWAYOUT; static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0); 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) ")");
/* /*
* Start the watchdog * Start the watchdog
@@ -72,8 +76,8 @@ static int wdt_start(void)
spin_lock_irqsave(&spinlock, flags); spin_lock_irqsave(&spinlock, flags);
/* Unlock the SuperIO chip */ /* Unlock the SuperIO chip */
outb_p(UNLOCK_DATA,IO_INDEX_PORT); outb_p(UNLOCK_DATA, IO_INDEX_PORT);
outb_p(UNLOCK_DATA,IO_INDEX_PORT); outb_p(UNLOCK_DATA, IO_INDEX_PORT);
/* /*
* Select device Aux2 (device=8) to set watchdog regs F2, F3 and F4. * Select device Aux2 (device=8) to set watchdog regs F2, F3 and F4.
@@ -81,18 +85,18 @@ static int wdt_start(void)
* F3 is set to enable watchdog LED blink at timeout. * F3 is set to enable watchdog LED blink at timeout.
* F4 is used to just clear the TIMEOUT'ed state (bit 0). * F4 is used to just clear the TIMEOUT'ed state (bit 0).
*/ */
outb_p(DEVICE_REGISTER,IO_INDEX_PORT); outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
outb_p(0x08,IO_DATA_PORT); outb_p(0x08, IO_DATA_PORT);
outb_p(0xF2,IO_INDEX_PORT); outb_p(0xF2, IO_INDEX_PORT);
outb_p(timeoutW,IO_DATA_PORT); outb_p(timeoutW, IO_DATA_PORT);
outb_p(0xF3,IO_INDEX_PORT); outb_p(0xF3, IO_INDEX_PORT);
outb_p(0x08,IO_DATA_PORT); outb_p(0x08, IO_DATA_PORT);
outb_p(0xF4,IO_INDEX_PORT); outb_p(0xF4, IO_INDEX_PORT);
outb_p(0x00,IO_DATA_PORT); outb_p(0x00, IO_DATA_PORT);
/* Set device Aux2 active */ /* Set device Aux2 active */
outb_p(0x30,IO_INDEX_PORT); outb_p(0x30, IO_INDEX_PORT);
outb_p(0x01,IO_DATA_PORT); outb_p(0x01, IO_DATA_PORT);
/* /*
* Select device Aux1 (dev=7) to set GP16 as the watchdog output * Select device Aux1 (dev=7) to set GP16 as the watchdog output
@@ -101,30 +105,29 @@ static int wdt_start(void)
* In test mode watch the bit 0 on F4 to indicate "triggered" or * In test mode watch the bit 0 on F4 to indicate "triggered" or
* check watchdog LED on SBC. * check watchdog LED on SBC.
*/ */
outb_p(DEVICE_REGISTER,IO_INDEX_PORT); outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
outb_p(0x07,IO_DATA_PORT); outb_p(0x07, IO_DATA_PORT);
if (!testmode) if (!testmode) {
{
unsigned pin_map; unsigned pin_map;
outb_p(0xE6,IO_INDEX_PORT); outb_p(0xE6, IO_INDEX_PORT);
outb_p(0x0A,IO_DATA_PORT); outb_p(0x0A, IO_DATA_PORT);
outb_p(0x2C,IO_INDEX_PORT); outb_p(0x2C, IO_INDEX_PORT);
pin_map = inb_p(IO_DATA_PORT); pin_map = inb_p(IO_DATA_PORT);
pin_map |= 0x10; pin_map |= 0x10;
pin_map &= ~(0x20); pin_map &= ~(0x20);
outb_p(0x2C,IO_INDEX_PORT); outb_p(0x2C, IO_INDEX_PORT);
outb_p(pin_map,IO_DATA_PORT); outb_p(pin_map, IO_DATA_PORT);
} }
outb_p(0xE3,IO_INDEX_PORT); outb_p(0xE3, IO_INDEX_PORT);
outb_p(0x08,IO_DATA_PORT); outb_p(0x08, IO_DATA_PORT);
/* Set device Aux1 active */ /* Set device Aux1 active */
outb_p(0x30,IO_INDEX_PORT); outb_p(0x30, IO_INDEX_PORT);
outb_p(0x01,IO_DATA_PORT); outb_p(0x01, IO_DATA_PORT);
/* Lock the SuperIO chip */ /* Lock the SuperIO chip */
outb_p(LOCK_DATA,IO_INDEX_PORT); outb_p(LOCK_DATA, IO_INDEX_PORT);
spin_unlock_irqrestore(&spinlock, flags); spin_unlock_irqrestore(&spinlock, flags);
@@ -144,8 +147,8 @@ static int wdt_stop(void)
spin_lock_irqsave(&spinlock, flags); spin_lock_irqsave(&spinlock, flags);
/* Unlock the SuperIO chip */ /* Unlock the SuperIO chip */
outb_p(UNLOCK_DATA,IO_INDEX_PORT); outb_p(UNLOCK_DATA, IO_INDEX_PORT);
outb_p(UNLOCK_DATA,IO_INDEX_PORT); outb_p(UNLOCK_DATA, IO_INDEX_PORT);
/* /*
* Select device Aux2 (device=8) to set watchdog regs F2, F3 and F4. * Select device Aux2 (device=8) to set watchdog regs F2, F3 and F4.
@@ -153,33 +156,32 @@ static int wdt_stop(void)
* F3 is reset to its default state. * F3 is reset to its default state.
* F4 clears the TIMEOUT'ed state (bit 0) - back to default. * F4 clears the TIMEOUT'ed state (bit 0) - back to default.
*/ */
outb_p(DEVICE_REGISTER,IO_INDEX_PORT); outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
outb_p(0x08,IO_DATA_PORT); outb_p(0x08, IO_DATA_PORT);
outb_p(0xF2,IO_INDEX_PORT); outb_p(0xF2, IO_INDEX_PORT);
outb_p(0xFF,IO_DATA_PORT); outb_p(0xFF, IO_DATA_PORT);
outb_p(0xF3,IO_INDEX_PORT); outb_p(0xF3, IO_INDEX_PORT);
outb_p(0x00,IO_DATA_PORT); outb_p(0x00, IO_DATA_PORT);
outb_p(0xF4,IO_INDEX_PORT); outb_p(0xF4, IO_INDEX_PORT);
outb_p(0x00,IO_DATA_PORT); outb_p(0x00, IO_DATA_PORT);
outb_p(0xF2,IO_INDEX_PORT); outb_p(0xF2, IO_INDEX_PORT);
outb_p(0x00,IO_DATA_PORT); outb_p(0x00, IO_DATA_PORT);
/* /*
* Select device Aux1 (dev=7) to set GP16 (in reg E6) and * Select device Aux1 (dev=7) to set GP16 (in reg E6) and
* Gp13 (in reg E3) as inputs. * Gp13 (in reg E3) as inputs.
*/ */
outb_p(DEVICE_REGISTER,IO_INDEX_PORT); outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
outb_p(0x07,IO_DATA_PORT); outb_p(0x07, IO_DATA_PORT);
if (!testmode) if (!testmode) {
{ outb_p(0xE6, IO_INDEX_PORT);
outb_p(0xE6,IO_INDEX_PORT); outb_p(0x01, IO_DATA_PORT);
outb_p(0x01,IO_DATA_PORT);
} }
outb_p(0xE3,IO_INDEX_PORT); outb_p(0xE3, IO_INDEX_PORT);
outb_p(0x01,IO_DATA_PORT); outb_p(0x01, IO_DATA_PORT);
/* Lock the SuperIO chip */ /* Lock the SuperIO chip */
outb_p(LOCK_DATA,IO_INDEX_PORT); outb_p(LOCK_DATA, IO_INDEX_PORT);
spin_unlock_irqrestore(&spinlock, flags); spin_unlock_irqrestore(&spinlock, flags);
@@ -200,17 +202,17 @@ static int wdt_keepalive(void)
spin_lock_irqsave(&spinlock, flags); spin_lock_irqsave(&spinlock, flags);
/* Unlock the SuperIO chip */ /* Unlock the SuperIO chip */
outb_p(UNLOCK_DATA,IO_INDEX_PORT); outb_p(UNLOCK_DATA, IO_INDEX_PORT);
outb_p(UNLOCK_DATA,IO_INDEX_PORT); outb_p(UNLOCK_DATA, IO_INDEX_PORT);
/* Select device Aux2 (device=8) to kick watchdog reg F2 */ /* Select device Aux2 (device=8) to kick watchdog reg F2 */
outb_p(DEVICE_REGISTER,IO_INDEX_PORT); outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
outb_p(0x08,IO_DATA_PORT); outb_p(0x08, IO_DATA_PORT);
outb_p(0xF2,IO_INDEX_PORT); outb_p(0xF2, IO_INDEX_PORT);
outb_p(timeoutW,IO_DATA_PORT); outb_p(timeoutW, IO_DATA_PORT);
/* Lock the SuperIO chip */ /* Lock the SuperIO chip */
outb_p(LOCK_DATA,IO_INDEX_PORT); outb_p(LOCK_DATA, IO_INDEX_PORT);
spin_unlock_irqrestore(&spinlock, flags); spin_unlock_irqrestore(&spinlock, flags);
@@ -261,17 +263,17 @@ static int wdt_get_status(int *status)
spin_lock_irqsave(&spinlock, flags); spin_lock_irqsave(&spinlock, flags);
/* Unlock the SuperIO chip */ /* Unlock the SuperIO chip */
outb_p(UNLOCK_DATA,IO_INDEX_PORT); outb_p(UNLOCK_DATA, IO_INDEX_PORT);
outb_p(UNLOCK_DATA,IO_INDEX_PORT); outb_p(UNLOCK_DATA, IO_INDEX_PORT);
/* Select device Aux2 (device=8) to read watchdog reg F4 */ /* Select device Aux2 (device=8) to read watchdog reg F4 */
outb_p(DEVICE_REGISTER,IO_INDEX_PORT); outb_p(DEVICE_REGISTER, IO_INDEX_PORT);
outb_p(0x08,IO_DATA_PORT); outb_p(0x08, IO_DATA_PORT);
outb_p(0xF4,IO_INDEX_PORT); outb_p(0xF4, IO_INDEX_PORT);
new_status = inb_p(IO_DATA_PORT); new_status = inb_p(IO_DATA_PORT);
/* Lock the SuperIO chip */ /* Lock the SuperIO chip */
outb_p(LOCK_DATA,IO_INDEX_PORT); outb_p(LOCK_DATA, IO_INDEX_PORT);
spin_unlock_irqrestore(&spinlock, flags); spin_unlock_irqrestore(&spinlock, flags);
@@ -290,7 +292,7 @@ static int wdt_get_status(int *status)
static int wdt_open(struct inode *inode, struct file *file) static int wdt_open(struct inode *inode, struct file *file)
{ {
/* If the watchdog is alive we don't need to start it again */ /* If the watchdog is alive we don't need to start it again */
if( test_and_set_bit(0, &timer_alive) ) if (test_and_set_bit(0, &timer_alive))
return -EBUSY; return -EBUSY;
if (nowayout) if (nowayout)
@@ -306,13 +308,13 @@ static int wdt_release(struct inode *inode, struct file *file)
* Shut off the timer. * Shut off the timer.
* Lock it in if it's a module and we set nowayout * Lock it in if it's a module and we set nowayout
*/ */
if (expect_close == 42) if (expect_close == 42) {
{
wdt_stop(); wdt_stop();
clear_bit(0, &timer_alive); clear_bit(0, &timer_alive);
} else { } else {
wdt_keepalive(); wdt_keepalive();
printk(KERN_CRIT PFX "unexpected close, not stopping watchdog!\n"); printk(KERN_CRIT PFX
"unexpected close, not stopping watchdog!\n");
} }
expect_close = 0; expect_close = 0;
return 0; return 0;
@@ -333,24 +335,22 @@ static ssize_t wdt_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos) size_t count, loff_t *ppos)
{ {
/* See if we got the magic character 'V' and reload the timer */ /* See if we got the magic character 'V' and reload the timer */
if(count) if (count) {
{ if (!nowayout) {
if (!nowayout)
{
size_t ofs; size_t ofs;
/* note: just in case someone wrote the magic character long ago */ /* note: just in case someone wrote the
magic character long ago */
expect_close = 0; expect_close = 0;
/* scan to see whether or not we got the magic character */ /* scan to see whether or not we got the
for(ofs = 0; ofs != count; ofs++) magic character */
{ for (ofs = 0; ofs != count; ofs++) {
char c; char c;
if (get_user(c, buf + ofs)) if (get_user(c, buf + ofs))
return -EFAULT; return -EFAULT;
if (c == 'V') { if (c == 'V')
expect_close = 42; expect_close = 42;
}
} }
} }
@@ -377,8 +377,7 @@ static struct watchdog_info ident = {
.identity = WATCHDOG_NAME, .identity = WATCHDOG_NAME,
}; };
static int wdt_ioctl(struct inode *inode, struct file *file, static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
unsigned int cmd, unsigned long arg)
{ {
int status; int status;
int new_options, retval = -EINVAL; int new_options, retval = -EINVAL;
@@ -390,13 +389,13 @@ static int wdt_ioctl(struct inode *inode, struct file *file,
uarg.i = (int __user *)arg; uarg.i = (int __user *)arg;
switch(cmd) switch (cmd) {
{
default: default:
return -ENOTTY; return -ENOTTY;
case WDIOC_GETSUPPORT: case WDIOC_GETSUPPORT:
return copy_to_user(uarg.ident, &ident, sizeof(ident)) ? -EFAULT : 0; return copy_to_user(uarg.ident, &ident,
sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS: case WDIOC_GETSTATUS:
wdt_get_status(&status); wdt_get_status(&status);
@@ -410,7 +409,7 @@ static int wdt_ioctl(struct inode *inode, struct file *file,
return 0; return 0;
case WDIOC_SETOPTIONS: case WDIOC_SETOPTIONS:
if (get_user (new_options, uarg.i)) if (get_user(new_options, uarg.i))
return -EFAULT; return -EFAULT;
if (new_options & WDIOS_DISABLECARD) { if (new_options & WDIOS_DISABLECARD) {
@@ -444,23 +443,21 @@ static int wdt_ioctl(struct inode *inode, struct file *file,
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) void *unused)
{ {
if (code==SYS_DOWN || code==SYS_HALT) if (code == SYS_DOWN || code == SYS_HALT)
wdt_stop(); wdt_stop();
return NOTIFY_DONE; return NOTIFY_DONE;
} }
static const struct file_operations wdt_fops= static const struct file_operations wdt_fops = {
{
.owner = THIS_MODULE, .owner = THIS_MODULE,
.llseek = no_llseek, .llseek = no_llseek,
.write = wdt_write, .write = wdt_write,
.ioctl = wdt_ioctl, .unlocked_ioctl = wdt_ioctl,
.open = wdt_open, .open = wdt_open,
.release = wdt_release, .release = wdt_release,
}; };
static struct miscdevice wdt_miscdev= static struct miscdevice wdt_miscdev = {
{
.minor = WATCHDOG_MINOR, .minor = WATCHDOG_MINOR,
.name = "watchdog", .name = "watchdog",
.fops = &wdt_fops, .fops = &wdt_fops,
@@ -474,20 +471,20 @@ static int __init w83977f_wdt_init(void)
{ {
int rc; int rc;
printk(KERN_INFO PFX DRIVER_VERSION); printk(KERN_INFO PFX DRIVER_VERSION);
/* /*
* Check that the timeout value is within it's range ; * Check that the timeout value is within it's range;
* if not reset to the default * if not reset to the default
*/ */
if (wdt_set_timeout(timeout)) { if (wdt_set_timeout(timeout)) {
wdt_set_timeout(DEFAULT_TIMEOUT); wdt_set_timeout(DEFAULT_TIMEOUT);
printk(KERN_INFO PFX "timeout value must be 15<=timeout<=7635, using %d\n", printk(KERN_INFO PFX
DEFAULT_TIMEOUT); "timeout value must be 15 <= timeout <= 7635, using %d\n",
DEFAULT_TIMEOUT);
} }
if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME)) if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME)) {
{
printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
IO_INDEX_PORT); IO_INDEX_PORT);
rc = -EIO; rc = -EIO;
@@ -495,30 +492,30 @@ static int __init w83977f_wdt_init(void)
} }
rc = register_reboot_notifier(&wdt_notifier); rc = register_reboot_notifier(&wdt_notifier);
if (rc) if (rc) {
{ printk(KERN_ERR PFX
printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", "cannot register reboot notifier (err=%d)\n", rc);
rc);
goto err_out_region; goto err_out_region;
} }
rc = misc_register(&wdt_miscdev); rc = misc_register(&wdt_miscdev);
if (rc) if (rc) {
{ printk(KERN_ERR PFX
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", "cannot register miscdev on minor=%d (err=%d)\n",
wdt_miscdev.minor, rc); wdt_miscdev.minor, rc);
goto err_out_reboot; goto err_out_reboot;
} }
printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d testmode=%d)\n", printk(KERN_INFO PFX
timeout, nowayout, testmode); "initialized. timeout=%d sec (nowayout=%d testmode=%d)\n",
timeout, nowayout, testmode);
return 0; return 0;
err_out_reboot: err_out_reboot:
unregister_reboot_notifier(&wdt_notifier); unregister_reboot_notifier(&wdt_notifier);
err_out_region: err_out_region:
release_region(IO_INDEX_PORT,2); release_region(IO_INDEX_PORT, 2);
err_out: err_out:
return rc; return rc;
} }
@@ -528,7 +525,7 @@ static void __exit w83977f_wdt_exit(void)
wdt_stop(); wdt_stop();
misc_deregister(&wdt_miscdev); misc_deregister(&wdt_miscdev);
unregister_reboot_notifier(&wdt_notifier); unregister_reboot_notifier(&wdt_notifier);
release_region(IO_INDEX_PORT,2); release_region(IO_INDEX_PORT, 2);
} }
module_init(w83977f_wdt_init); module_init(w83977f_wdt_init);