watchdog: Convert wm8350_wdt driver to watchdog core
This patch converts wm8350_wdt driver to use watchdog core APIs. Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Axel Lin
Wim Van Sebroeck
Родитель
85f6df1492
Коммит
2e51d90f4d
|
|
@ -74,6 +74,7 @@ config WM831X_WATCHDOG
|
|||
config WM8350_WATCHDOG
|
||||
tristate "WM8350 watchdog"
|
||||
depends on MFD_WM8350
|
||||
select WATCHDOG_CORE
|
||||
help
|
||||
Support for the watchdog in the WM8350 AudioPlus PMIC. When
|
||||
the watchdog triggers the system will be reset.
|
||||
|
|
|
|||
|
|
@ -14,8 +14,6 @@
|
|||
#include <linux/moduleparam.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <linux/uaccess.h>
|
||||
|
|
@ -27,13 +25,10 @@ MODULE_PARM_DESC(nowayout,
|
|||
"Watchdog cannot be stopped once started (default="
|
||||
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
||||
|
||||
static unsigned long wm8350_wdt_users;
|
||||
static struct miscdevice wm8350_wdt_miscdev;
|
||||
static int wm8350_wdt_expect_close;
|
||||
static DEFINE_MUTEX(wdt_mutex);
|
||||
|
||||
static struct {
|
||||
int time; /* Seconds */
|
||||
unsigned int time; /* Seconds */
|
||||
u16 val; /* To be set in WM8350_SYSTEM_CONTROL_2 */
|
||||
} wm8350_wdt_cfgs[] = {
|
||||
{ 1, 0x02 },
|
||||
|
|
@ -41,22 +36,25 @@ static struct {
|
|||
{ 4, 0x05 },
|
||||
};
|
||||
|
||||
static struct wm8350 *get_wm8350(void)
|
||||
static int wm8350_wdt_set_timeout(struct watchdog_device *wdt_dev,
|
||||
unsigned int timeout)
|
||||
{
|
||||
return dev_get_drvdata(wm8350_wdt_miscdev.parent);
|
||||
}
|
||||
|
||||
static int wm8350_wdt_set_timeout(struct wm8350 *wm8350, u16 value)
|
||||
{
|
||||
int ret;
|
||||
struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev);
|
||||
int ret, i;
|
||||
u16 reg;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++)
|
||||
if (wm8350_wdt_cfgs[i].time == timeout)
|
||||
break;
|
||||
if (i == ARRAY_SIZE(wm8350_wdt_cfgs))
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&wdt_mutex);
|
||||
wm8350_reg_unlock(wm8350);
|
||||
|
||||
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
||||
reg &= ~WM8350_WDOG_TO_MASK;
|
||||
reg |= value;
|
||||
reg |= wm8350_wdt_cfgs[i].val;
|
||||
ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
|
||||
|
||||
wm8350_reg_lock(wm8350);
|
||||
|
|
@ -65,8 +63,9 @@ static int wm8350_wdt_set_timeout(struct wm8350 *wm8350, u16 value)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static int wm8350_wdt_start(struct wm8350 *wm8350)
|
||||
static int wm8350_wdt_start(struct watchdog_device *wdt_dev)
|
||||
{
|
||||
struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev);
|
||||
int ret;
|
||||
u16 reg;
|
||||
|
||||
|
|
@ -84,8 +83,9 @@ static int wm8350_wdt_start(struct wm8350 *wm8350)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static int wm8350_wdt_stop(struct wm8350 *wm8350)
|
||||
static int wm8350_wdt_stop(struct watchdog_device *wdt_dev)
|
||||
{
|
||||
struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev);
|
||||
int ret;
|
||||
u16 reg;
|
||||
|
||||
|
|
@ -102,8 +102,9 @@ static int wm8350_wdt_stop(struct wm8350 *wm8350)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static int wm8350_wdt_kick(struct wm8350 *wm8350)
|
||||
static int wm8350_wdt_ping(struct watchdog_device *wdt_dev)
|
||||
{
|
||||
struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev);
|
||||
int ret;
|
||||
u16 reg;
|
||||
|
||||
|
|
@ -117,168 +118,25 @@ static int wm8350_wdt_kick(struct wm8350 *wm8350)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static int wm8350_wdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct wm8350 *wm8350 = get_wm8350();
|
||||
int ret;
|
||||
|
||||
if (!wm8350)
|
||||
return -ENODEV;
|
||||
|
||||
if (test_and_set_bit(0, &wm8350_wdt_users))
|
||||
return -EBUSY;
|
||||
|
||||
ret = wm8350_wdt_start(wm8350);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static int wm8350_wdt_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct wm8350 *wm8350 = get_wm8350();
|
||||
|
||||
if (wm8350_wdt_expect_close)
|
||||
wm8350_wdt_stop(wm8350);
|
||||
else {
|
||||
dev_warn(wm8350->dev, "Watchdog device closed uncleanly\n");
|
||||
wm8350_wdt_kick(wm8350);
|
||||
}
|
||||
|
||||
clear_bit(0, &wm8350_wdt_users);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t wm8350_wdt_write(struct file *file,
|
||||
const char __user *data, size_t count,
|
||||
loff_t *ppos)
|
||||
{
|
||||
struct wm8350 *wm8350 = get_wm8350();
|
||||
size_t i;
|
||||
|
||||
if (count) {
|
||||
wm8350_wdt_kick(wm8350);
|
||||
|
||||
if (!nowayout) {
|
||||
/* In case it was set long ago */
|
||||
wm8350_wdt_expect_close = 0;
|
||||
|
||||
/* scan to see whether or not we got the magic
|
||||
character */
|
||||
for (i = 0; i != count; i++) {
|
||||
char c;
|
||||
if (get_user(c, data + i))
|
||||
return -EFAULT;
|
||||
if (c == 'V')
|
||||
wm8350_wdt_expect_close = 42;
|
||||
}
|
||||
}
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
static const struct watchdog_info ident = {
|
||||
static const struct watchdog_info wm8350_wdt_info = {
|
||||
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
||||
.identity = "WM8350 Watchdog",
|
||||
};
|
||||
|
||||
static long wm8350_wdt_ioctl(struct file *file, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
struct wm8350 *wm8350 = get_wm8350();
|
||||
int ret = -ENOTTY, time, i;
|
||||
void __user *argp = (void __user *)arg;
|
||||
int __user *p = argp;
|
||||
u16 reg;
|
||||
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
ret = copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
|
||||
break;
|
||||
|
||||
case WDIOC_GETSTATUS:
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
ret = put_user(0, p);
|
||||
break;
|
||||
|
||||
case WDIOC_SETOPTIONS:
|
||||
{
|
||||
int options;
|
||||
|
||||
if (get_user(options, p))
|
||||
return -EFAULT;
|
||||
|
||||
ret = -EINVAL;
|
||||
|
||||
/* Setting both simultaneously means at least one must fail */
|
||||
if (options == WDIOS_DISABLECARD)
|
||||
ret = wm8350_wdt_stop(wm8350);
|
||||
|
||||
if (options == WDIOS_ENABLECARD)
|
||||
ret = wm8350_wdt_start(wm8350);
|
||||
break;
|
||||
}
|
||||
|
||||
case WDIOC_KEEPALIVE:
|
||||
ret = wm8350_wdt_kick(wm8350);
|
||||
break;
|
||||
|
||||
case WDIOC_SETTIMEOUT:
|
||||
ret = get_user(time, p);
|
||||
if (ret)
|
||||
break;
|
||||
|
||||
if (time == 0) {
|
||||
if (nowayout)
|
||||
ret = -EINVAL;
|
||||
else
|
||||
wm8350_wdt_stop(wm8350);
|
||||
break;
|
||||
}
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++)
|
||||
if (wm8350_wdt_cfgs[i].time == time)
|
||||
break;
|
||||
if (i == ARRAY_SIZE(wm8350_wdt_cfgs))
|
||||
ret = -EINVAL;
|
||||
else
|
||||
ret = wm8350_wdt_set_timeout(wm8350,
|
||||
wm8350_wdt_cfgs[i].val);
|
||||
break;
|
||||
|
||||
case WDIOC_GETTIMEOUT:
|
||||
reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
|
||||
reg &= WM8350_WDOG_TO_MASK;
|
||||
for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++)
|
||||
if (wm8350_wdt_cfgs[i].val == reg)
|
||||
break;
|
||||
if (i == ARRAY_SIZE(wm8350_wdt_cfgs)) {
|
||||
dev_warn(wm8350->dev,
|
||||
"Unknown watchdog configuration: %x\n", reg);
|
||||
ret = -EINVAL;
|
||||
} else
|
||||
ret = put_user(wm8350_wdt_cfgs[i].time, p);
|
||||
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct file_operations wm8350_wdt_fops = {
|
||||
static const struct watchdog_ops wm8350_wdt_ops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = wm8350_wdt_write,
|
||||
.unlocked_ioctl = wm8350_wdt_ioctl,
|
||||
.open = wm8350_wdt_open,
|
||||
.release = wm8350_wdt_release,
|
||||
.start = wm8350_wdt_start,
|
||||
.stop = wm8350_wdt_stop,
|
||||
.ping = wm8350_wdt_ping,
|
||||
.set_timeout = wm8350_wdt_set_timeout,
|
||||
};
|
||||
|
||||
static struct miscdevice wm8350_wdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &wm8350_wdt_fops,
|
||||
static struct watchdog_device wm8350_wdt = {
|
||||
.info = &wm8350_wdt_info,
|
||||
.ops = &wm8350_wdt_ops,
|
||||
.timeout = 4,
|
||||
.min_timeout = 1,
|
||||
.max_timeout = 4,
|
||||
};
|
||||
|
||||
static int __devinit wm8350_wdt_probe(struct platform_device *pdev)
|
||||
|
|
@ -290,18 +148,18 @@ static int __devinit wm8350_wdt_probe(struct platform_device *pdev)
|
|||
return -ENODEV;
|
||||
}
|
||||
|
||||
watchdog_set_nowayout(&wm8350_wdt, nowayout);
|
||||
watchdog_set_drvdata(&wm8350_wdt, wm8350);
|
||||
|
||||
/* Default to 4s timeout */
|
||||
wm8350_wdt_set_timeout(wm8350, 0x05);
|
||||
wm8350_wdt_set_timeout(&wm8350_wdt, 4);
|
||||
|
||||
wm8350_wdt_miscdev.parent = &pdev->dev;
|
||||
|
||||
return misc_register(&wm8350_wdt_miscdev);
|
||||
return watchdog_register_device(&wm8350_wdt);
|
||||
}
|
||||
|
||||
static int __devexit wm8350_wdt_remove(struct platform_device *pdev)
|
||||
{
|
||||
misc_deregister(&wm8350_wdt_miscdev);
|
||||
|
||||
watchdog_unregister_device(&wm8350_wdt);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче