mirror of https://gitee.com/openkylin/linux.git
watchdog: it87: Convert to use watchdog core infrastructure
Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Guenter Roeck
Wim Van Sebroeck
parent
7334030173
commit
1d7b80394c
|
|
@ -1069,6 +1069,7 @@ config IT8712F_WDT
|
|||
config IT87_WDT
|
||||
tristate "IT87 Watchdog Timer"
|
||||
depends on X86
|
||||
select WATCHDOG_CORE
|
||||
---help---
|
||||
This is the driver for the hardware watchdog on the ITE IT8620,
|
||||
IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726 and IT8728
|
||||
|
|
|
|||
|
|
@ -32,26 +32,18 @@
|
|||
#include <linux/moduleparam.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/ioport.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <linux/notifier.h>
|
||||
#include <linux/reboot.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/io.h>
|
||||
|
||||
|
||||
#define WATCHDOG_VERSION "1.14"
|
||||
#define WATCHDOG_NAME "IT87 WDT"
|
||||
#define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n"
|
||||
#define WD_MAGIC 'V'
|
||||
|
||||
/* Defaults for Module Parameter */
|
||||
#define DEFAULT_NOGAMEPORT 0
|
||||
#define DEFAULT_NOCIR 0
|
||||
#define DEFAULT_EXCLUSIVE 1
|
||||
#define DEFAULT_TIMEOUT 60
|
||||
#define DEFAULT_TESTMODE 0
|
||||
#define DEFAULT_NOWAYOUT WATCHDOG_NOWAYOUT
|
||||
|
|
@ -129,23 +121,17 @@
|
|||
#define GP_BASE_DEFAULT 0x0201
|
||||
|
||||
/* wdt_status */
|
||||
#define WDTS_TIMER_RUN 0
|
||||
#define WDTS_DEV_OPEN 1
|
||||
#define WDTS_KEEPALIVE 2
|
||||
#define WDTS_LOCKED 3
|
||||
#define WDTS_USE_GP 4
|
||||
#define WDTS_EXPECTED 5
|
||||
#define WDTS_USE_CIR 6
|
||||
#define WDTS_USE_GP 0
|
||||
#define WDTS_USE_CIR 1
|
||||
|
||||
static unsigned int base, gpact, ciract, max_units, chip_type;
|
||||
static unsigned long wdt_status;
|
||||
static unsigned int base, gpact, ciract, max_units, chip_type;
|
||||
static unsigned long wdt_status;
|
||||
|
||||
static int nogameport = DEFAULT_NOGAMEPORT;
|
||||
static int nocir = DEFAULT_NOCIR;
|
||||
static int exclusive = DEFAULT_EXCLUSIVE;
|
||||
static int timeout = DEFAULT_TIMEOUT;
|
||||
static int testmode = DEFAULT_TESTMODE;
|
||||
static bool nowayout = DEFAULT_NOWAYOUT;
|
||||
static int nogameport = DEFAULT_NOGAMEPORT;
|
||||
static int nocir = DEFAULT_NOCIR;
|
||||
static unsigned int timeout = DEFAULT_TIMEOUT;
|
||||
static int testmode = DEFAULT_TESTMODE;
|
||||
static bool nowayout = DEFAULT_NOWAYOUT;
|
||||
|
||||
module_param(nogameport, int, 0);
|
||||
MODULE_PARM_DESC(nogameport, "Forbid the activation of game port, default="
|
||||
|
|
@ -153,9 +139,6 @@ MODULE_PARM_DESC(nogameport, "Forbid the activation of game port, default="
|
|||
module_param(nocir, int, 0);
|
||||
MODULE_PARM_DESC(nocir, "Forbid the use of Consumer IR interrupts to reset timer, default="
|
||||
__MODULE_STRING(DEFAULT_NOCIR));
|
||||
module_param(exclusive, int, 0);
|
||||
MODULE_PARM_DESC(exclusive, "Watchdog exclusive device open, default="
|
||||
__MODULE_STRING(DEFAULT_EXCLUSIVE));
|
||||
module_param(timeout, int, 0);
|
||||
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, default="
|
||||
__MODULE_STRING(DEFAULT_TIMEOUT));
|
||||
|
|
@ -227,7 +210,7 @@ static inline void superio_outw(int val, int reg)
|
|||
}
|
||||
|
||||
/* Internal function, should be called after superio_select(GPIO) */
|
||||
static void wdt_update_timeout(void)
|
||||
static void _wdt_update_timeout(void)
|
||||
{
|
||||
unsigned char cfg = WDT_KRST;
|
||||
int tm = timeout;
|
||||
|
|
@ -249,6 +232,21 @@ static void wdt_update_timeout(void)
|
|||
superio_outb(tm>>8, WDTVALMSB);
|
||||
}
|
||||
|
||||
static int wdt_update_timeout(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = superio_enter();
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
superio_select(GPIO);
|
||||
_wdt_update_timeout();
|
||||
superio_exit();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int wdt_round_time(int t)
|
||||
{
|
||||
t += 59;
|
||||
|
|
@ -258,25 +256,22 @@ static int wdt_round_time(int t)
|
|||
|
||||
/* watchdog timer handling */
|
||||
|
||||
static void wdt_keepalive(void)
|
||||
static int wdt_keepalive(struct watchdog_device *wdd)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
if (test_bit(WDTS_USE_GP, &wdt_status))
|
||||
inb(base);
|
||||
else if (test_bit(WDTS_USE_CIR, &wdt_status))
|
||||
/* The timer reloads with around 5 msec delay */
|
||||
outb(0x55, CIR_DR(base));
|
||||
else {
|
||||
if (superio_enter())
|
||||
return;
|
||||
else
|
||||
ret = wdt_update_timeout();
|
||||
|
||||
superio_select(GPIO);
|
||||
wdt_update_timeout();
|
||||
superio_exit();
|
||||
}
|
||||
set_bit(WDTS_KEEPALIVE, &wdt_status);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int wdt_start(void)
|
||||
static int wdt_start(struct watchdog_device *wdd)
|
||||
{
|
||||
int ret = superio_enter();
|
||||
if (ret)
|
||||
|
|
@ -287,14 +282,15 @@ static int wdt_start(void)
|
|||
superio_outb(WDT_GAMEPORT, WDTCTRL);
|
||||
else if (test_bit(WDTS_USE_CIR, &wdt_status))
|
||||
superio_outb(WDT_CIRINT, WDTCTRL);
|
||||
wdt_update_timeout();
|
||||
|
||||
_wdt_update_timeout();
|
||||
|
||||
superio_exit();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int wdt_stop(void)
|
||||
static int wdt_stop(struct watchdog_device *wdd)
|
||||
{
|
||||
int ret = superio_enter();
|
||||
if (ret)
|
||||
|
|
@ -321,280 +317,49 @@ static int wdt_stop(void)
|
|||
* Used within WDIOC_SETTIMEOUT watchdog device ioctl.
|
||||
*/
|
||||
|
||||
static int wdt_set_timeout(int t)
|
||||
static int wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
|
||||
{
|
||||
if (t < 1 || t > max_units * 60)
|
||||
return -EINVAL;
|
||||
int ret = 0;
|
||||
|
||||
if (t > max_units)
|
||||
timeout = wdt_round_time(t);
|
||||
else
|
||||
timeout = t;
|
||||
t = wdt_round_time(t);
|
||||
|
||||
if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
|
||||
int ret = superio_enter();
|
||||
if (ret)
|
||||
return ret;
|
||||
wdd->timeout = t;
|
||||
|
||||
superio_select(GPIO);
|
||||
wdt_update_timeout();
|
||||
superio_exit();
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
if (watchdog_hw_running(wdd))
|
||||
ret = wdt_update_timeout();
|
||||
|
||||
/**
|
||||
* wdt_get_status - determines the status supported by watchdog ioctl
|
||||
* @status: status returned to user space
|
||||
*
|
||||
* The status bit of the device does not allow to distinguish
|
||||
* between a regular system reset and a watchdog forced reset.
|
||||
* But, in test mode it is useful, so it is supported through
|
||||
* WDIOC_GETSTATUS watchdog ioctl. Additionally the driver
|
||||
* reports the keepalive signal and the acception of the magic.
|
||||
*
|
||||
* Used within WDIOC_GETSTATUS watchdog device ioctl.
|
||||
*/
|
||||
|
||||
static int wdt_get_status(int *status)
|
||||
{
|
||||
*status = 0;
|
||||
if (testmode) {
|
||||
int ret = superio_enter();
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
superio_select(GPIO);
|
||||
if (superio_inb(WDTCTRL) & WDT_ZERO) {
|
||||
superio_outb(0x00, WDTCTRL);
|
||||
clear_bit(WDTS_TIMER_RUN, &wdt_status);
|
||||
*status |= WDIOF_CARDRESET;
|
||||
}
|
||||
|
||||
superio_exit();
|
||||
}
|
||||
if (test_and_clear_bit(WDTS_KEEPALIVE, &wdt_status))
|
||||
*status |= WDIOF_KEEPALIVEPING;
|
||||
if (test_bit(WDTS_EXPECTED, &wdt_status))
|
||||
*status |= WDIOF_MAGICCLOSE;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* /dev/watchdog handling */
|
||||
|
||||
/**
|
||||
* wdt_open - watchdog file_operations .open
|
||||
* @inode: inode of the device
|
||||
* @file: file handle to the device
|
||||
*
|
||||
* The watchdog timer starts by opening the device.
|
||||
*
|
||||
* Used within the file operation of the watchdog device.
|
||||
*/
|
||||
|
||||
static int wdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (exclusive && test_and_set_bit(WDTS_DEV_OPEN, &wdt_status))
|
||||
return -EBUSY;
|
||||
if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) {
|
||||
int ret;
|
||||
if (nowayout && !test_and_set_bit(WDTS_LOCKED, &wdt_status))
|
||||
__module_get(THIS_MODULE);
|
||||
|
||||
ret = wdt_start();
|
||||
if (ret) {
|
||||
clear_bit(WDTS_LOCKED, &wdt_status);
|
||||
clear_bit(WDTS_TIMER_RUN, &wdt_status);
|
||||
clear_bit(WDTS_DEV_OPEN, &wdt_status);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
/**
|
||||
* wdt_release - watchdog file_operations .release
|
||||
* @inode: inode of the device
|
||||
* @file: file handle to the device
|
||||
*
|
||||
* Closing the watchdog device either stops the watchdog timer
|
||||
* or in the case, that nowayout is set or the magic character
|
||||
* wasn't written, a critical warning about an running watchdog
|
||||
* timer is given.
|
||||
*
|
||||
* Used within the file operation of the watchdog device.
|
||||
*/
|
||||
|
||||
static int wdt_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
|
||||
if (test_and_clear_bit(WDTS_EXPECTED, &wdt_status)) {
|
||||
int ret = wdt_stop();
|
||||
if (ret) {
|
||||
/*
|
||||
* Stop failed. Just keep the watchdog alive
|
||||
* and hope nothing bad happens.
|
||||
*/
|
||||
set_bit(WDTS_EXPECTED, &wdt_status);
|
||||
wdt_keepalive();
|
||||
return ret;
|
||||
}
|
||||
clear_bit(WDTS_TIMER_RUN, &wdt_status);
|
||||
} else {
|
||||
wdt_keepalive();
|
||||
pr_crit("unexpected close, not stopping watchdog!\n");
|
||||
}
|
||||
}
|
||||
clear_bit(WDTS_DEV_OPEN, &wdt_status);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* wdt_write - watchdog file_operations .write
|
||||
* @file: file handle to the watchdog
|
||||
* @buf: buffer to write
|
||||
* @count: count of bytes
|
||||
* @ppos: pointer to the position to write. No seeks allowed
|
||||
*
|
||||
* A write to a watchdog device is defined as a keepalive signal. Any
|
||||
* write of data will do, as we don't define content meaning.
|
||||
*
|
||||
* Used within the file operation of the watchdog device.
|
||||
*/
|
||||
|
||||
static ssize_t wdt_write(struct file *file, const char __user *buf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
if (count) {
|
||||
clear_bit(WDTS_EXPECTED, &wdt_status);
|
||||
wdt_keepalive();
|
||||
}
|
||||
if (!nowayout) {
|
||||
size_t ofs;
|
||||
|
||||
/* note: just in case someone wrote the magic character long ago */
|
||||
for (ofs = 0; ofs != count; ofs++) {
|
||||
char c;
|
||||
if (get_user(c, buf + ofs))
|
||||
return -EFAULT;
|
||||
if (c == WD_MAGIC)
|
||||
set_bit(WDTS_EXPECTED, &wdt_status);
|
||||
}
|
||||
}
|
||||
return count;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct watchdog_info ident = {
|
||||
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
|
||||
.firmware_version = 1,
|
||||
.firmware_version = 1,
|
||||
.identity = WATCHDOG_NAME,
|
||||
};
|
||||
|
||||
/**
|
||||
* wdt_ioctl - watchdog file_operations .unlocked_ioctl
|
||||
* @file: file handle to the device
|
||||
* @cmd: watchdog command
|
||||
* @arg: argument pointer
|
||||
*
|
||||
* The watchdog API defines a common set of functions for all watchdogs
|
||||
* according to their available features.
|
||||
*
|
||||
* Used within the file operation of the watchdog device.
|
||||
*/
|
||||
static struct watchdog_ops wdt_ops = {
|
||||
.owner = THIS_MODULE,
|
||||
.start = wdt_start,
|
||||
.stop = wdt_stop,
|
||||
.ping = wdt_keepalive,
|
||||
.set_timeout = wdt_set_timeout,
|
||||
};
|
||||
|
||||
static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
int rc = 0, status, new_options, new_timeout;
|
||||
union {
|
||||
struct watchdog_info __user *ident;
|
||||
int __user *i;
|
||||
} uarg;
|
||||
|
||||
uarg.i = (int __user *)arg;
|
||||
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
return copy_to_user(uarg.ident,
|
||||
&ident, sizeof(ident)) ? -EFAULT : 0;
|
||||
|
||||
case WDIOC_GETSTATUS:
|
||||
rc = wdt_get_status(&status);
|
||||
if (rc)
|
||||
return rc;
|
||||
return put_user(status, uarg.i);
|
||||
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
return put_user(0, uarg.i);
|
||||
|
||||
case WDIOC_KEEPALIVE:
|
||||
wdt_keepalive();
|
||||
return 0;
|
||||
|
||||
case WDIOC_SETOPTIONS:
|
||||
if (get_user(new_options, uarg.i))
|
||||
return -EFAULT;
|
||||
|
||||
switch (new_options) {
|
||||
case WDIOS_DISABLECARD:
|
||||
if (test_bit(WDTS_TIMER_RUN, &wdt_status)) {
|
||||
rc = wdt_stop();
|
||||
if (rc)
|
||||
return rc;
|
||||
}
|
||||
clear_bit(WDTS_TIMER_RUN, &wdt_status);
|
||||
return 0;
|
||||
|
||||
case WDIOS_ENABLECARD:
|
||||
if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) {
|
||||
rc = wdt_start();
|
||||
if (rc) {
|
||||
clear_bit(WDTS_TIMER_RUN, &wdt_status);
|
||||
return rc;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
|
||||
default:
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
case WDIOC_SETTIMEOUT:
|
||||
if (get_user(new_timeout, uarg.i))
|
||||
return -EFAULT;
|
||||
rc = wdt_set_timeout(new_timeout);
|
||||
case WDIOC_GETTIMEOUT:
|
||||
if (put_user(timeout, uarg.i))
|
||||
return -EFAULT;
|
||||
return rc;
|
||||
|
||||
default:
|
||||
return -ENOTTY;
|
||||
}
|
||||
}
|
||||
static struct watchdog_device wdt_dev = {
|
||||
.info = &ident,
|
||||
.ops = &wdt_ops,
|
||||
.min_timeout = 1,
|
||||
};
|
||||
|
||||
static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
|
||||
void *unused)
|
||||
void *unused)
|
||||
{
|
||||
if (code == SYS_DOWN || code == SYS_HALT)
|
||||
wdt_stop();
|
||||
wdt_stop(&wdt_dev);
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
static const struct file_operations wdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = wdt_write,
|
||||
.unlocked_ioctl = wdt_ioctl,
|
||||
.open = wdt_open,
|
||||
.release = wdt_release,
|
||||
};
|
||||
|
||||
static struct miscdevice wdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &wdt_fops,
|
||||
};
|
||||
|
||||
static struct notifier_block wdt_notifier = {
|
||||
.notifier_call = wdt_notify_sys,
|
||||
};
|
||||
|
|
@ -708,19 +473,15 @@ static int __init it87_wdt_init(void)
|
|||
if (timeout > max_units)
|
||||
timeout = wdt_round_time(timeout);
|
||||
|
||||
wdt_dev.timeout = timeout;
|
||||
wdt_dev.max_timeout = max_units * 60;
|
||||
|
||||
rc = register_reboot_notifier(&wdt_notifier);
|
||||
if (rc) {
|
||||
pr_err("Cannot register reboot notifier (err=%d)\n", rc);
|
||||
goto err_out_region;
|
||||
}
|
||||
|
||||
rc = misc_register(&wdt_miscdev);
|
||||
if (rc) {
|
||||
pr_err("Cannot register miscdev on minor=%d (err=%d)\n",
|
||||
wdt_miscdev.minor, rc);
|
||||
goto err_out_reboot;
|
||||
}
|
||||
|
||||
/* Initialize CIR to use it as keepalive source */
|
||||
if (test_bit(WDTS_USE_CIR, &wdt_status)) {
|
||||
outb(0x00, CIR_RCR(base));
|
||||
|
|
@ -732,9 +493,15 @@ static int __init it87_wdt_init(void)
|
|||
outb(0x09, CIR_IER(base));
|
||||
}
|
||||
|
||||
pr_info("Chip IT%04x revision %d initialized. timeout=%d sec (nowayout=%d testmode=%d exclusive=%d nogameport=%d nocir=%d)\n",
|
||||
rc = watchdog_register_device(&wdt_dev);
|
||||
if (rc) {
|
||||
pr_err("Cannot register watchdog device (err=%d)\n", rc);
|
||||
goto err_out_reboot;
|
||||
}
|
||||
|
||||
pr_info("Chip IT%04x revision %d initialized. timeout=%d sec (nowayout=%d testmode=%d nogameport=%d nocir=%d)\n",
|
||||
chip_type, chip_rev, timeout,
|
||||
nowayout, testmode, exclusive, nogameport, nocir);
|
||||
nowayout, testmode, nogameport, nocir);
|
||||
|
||||
superio_exit();
|
||||
return 0;
|
||||
|
|
@ -778,7 +545,7 @@ static void __exit it87_wdt_exit(void)
|
|||
superio_exit();
|
||||
}
|
||||
|
||||
misc_deregister(&wdt_miscdev);
|
||||
watchdog_unregister_device(&wdt_dev);
|
||||
unregister_reboot_notifier(&wdt_notifier);
|
||||
|
||||
if (test_bit(WDTS_USE_GP, &wdt_status))
|
||||
|
|
|
|||
Loading…
Reference in New Issue