mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 22:21:40 +00:00
watchdog: sch56xx: Use watchdog core
Convert sch56xx drivers to the generic watchdog core. Note this patch depends on the "watchdog: Add multiple device support" patch from Alan Cox. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Hans de Goede
Wim Van Sebroeck
parent
e907df3272
commit
fb551405c0
@ -579,7 +579,7 @@ static int __devinit sch5627_probe(struct platform_device *pdev)
|
||||
}
|
||||
|
||||
/* Note failing to register the watchdog is not a fatal error */
|
||||
data->watchdog = sch56xx_watchdog_register(data->addr,
|
||||
data->watchdog = sch56xx_watchdog_register(&pdev->dev, data->addr,
|
||||
(build_code << 24) | (build_id << 8) | hwmon_rev,
|
||||
&data->update_lock, 1);
|
||||
|
||||
|
||||
@ -510,7 +510,7 @@ static int __devinit sch5636_probe(struct platform_device *pdev)
|
||||
}
|
||||
|
||||
/* Note failing to register the watchdog is not a fatal error */
|
||||
data->watchdog = sch56xx_watchdog_register(data->addr,
|
||||
data->watchdog = sch56xx_watchdog_register(&pdev->dev, data->addr,
|
||||
(revision[0] << 8) | revision[1],
|
||||
&data->update_lock, 0);
|
||||
|
||||
|
||||
@ -66,15 +66,9 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
|
||||
|
||||
struct sch56xx_watchdog_data {
|
||||
u16 addr;
|
||||
u32 revision;
|
||||
struct mutex *io_lock;
|
||||
struct mutex watchdog_lock;
|
||||
struct list_head list; /* member of the watchdog_data_list */
|
||||
struct kref kref;
|
||||
struct miscdevice watchdog_miscdev;
|
||||
unsigned long watchdog_is_open;
|
||||
char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
|
||||
char watchdog_expect_close;
|
||||
struct watchdog_info wdinfo;
|
||||
struct watchdog_device wddev;
|
||||
u8 watchdog_preset;
|
||||
u8 watchdog_control;
|
||||
u8 watchdog_output_enable;
|
||||
@ -82,15 +76,6 @@ struct sch56xx_watchdog_data {
|
||||
|
||||
static struct platform_device *sch56xx_pdev;
|
||||
|
||||
/*
|
||||
* Somewhat ugly :( global data pointer list with all sch56xx devices, so that
|
||||
* we can find our device data as when using misc_register there is no other
|
||||
* method to get to ones device data from the open fop.
|
||||
*/
|
||||
static LIST_HEAD(watchdog_data_list);
|
||||
/* Note this lock not only protect list access, but also data.kref access */
|
||||
static DEFINE_MUTEX(watchdog_data_mutex);
|
||||
|
||||
/* Super I/O functions */
|
||||
static inline int superio_inb(int base, int reg)
|
||||
{
|
||||
@ -272,22 +257,13 @@ EXPORT_SYMBOL(sch56xx_read_virtual_reg12);
|
||||
* Watchdog routines
|
||||
*/
|
||||
|
||||
/*
|
||||
* Release our data struct when the platform device has been released *and*
|
||||
* all references to our watchdog device are released.
|
||||
*/
|
||||
static void sch56xx_watchdog_release_resources(struct kref *r)
|
||||
static int watchdog_set_timeout(struct watchdog_device *wddev,
|
||||
unsigned int timeout)
|
||||
{
|
||||
struct sch56xx_watchdog_data *data =
|
||||
container_of(r, struct sch56xx_watchdog_data, kref);
|
||||
kfree(data);
|
||||
}
|
||||
|
||||
static int watchdog_set_timeout(struct sch56xx_watchdog_data *data,
|
||||
int timeout)
|
||||
{
|
||||
int ret, resolution;
|
||||
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
|
||||
unsigned int resolution;
|
||||
u8 control;
|
||||
int ret;
|
||||
|
||||
/* 1 second or 60 second resolution? */
|
||||
if (timeout <= 255)
|
||||
@ -298,12 +274,6 @@ static int watchdog_set_timeout(struct sch56xx_watchdog_data *data,
|
||||
if (timeout < resolution || timeout > (resolution * 255))
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&data->watchdog_lock);
|
||||
if (!data->addr) {
|
||||
ret = -ENODEV;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
if (resolution == 1)
|
||||
control = data->watchdog_control | SCH56XX_WDOG_TIME_BASE_SEC;
|
||||
else
|
||||
@ -316,7 +286,7 @@ static int watchdog_set_timeout(struct sch56xx_watchdog_data *data,
|
||||
control);
|
||||
mutex_unlock(data->io_lock);
|
||||
if (ret)
|
||||
goto leave;
|
||||
return ret;
|
||||
|
||||
data->watchdog_control = control;
|
||||
}
|
||||
@ -326,38 +296,17 @@ static int watchdog_set_timeout(struct sch56xx_watchdog_data *data,
|
||||
* the watchdog countdown.
|
||||
*/
|
||||
data->watchdog_preset = DIV_ROUND_UP(timeout, resolution);
|
||||
wddev->timeout = data->watchdog_preset * resolution;
|
||||
|
||||
ret = data->watchdog_preset * resolution;
|
||||
leave:
|
||||
mutex_unlock(&data->watchdog_lock);
|
||||
return ret;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int watchdog_get_timeout(struct sch56xx_watchdog_data *data)
|
||||
{
|
||||
int timeout;
|
||||
|
||||
mutex_lock(&data->watchdog_lock);
|
||||
if (data->watchdog_control & SCH56XX_WDOG_TIME_BASE_SEC)
|
||||
timeout = data->watchdog_preset;
|
||||
else
|
||||
timeout = data->watchdog_preset * 60;
|
||||
mutex_unlock(&data->watchdog_lock);
|
||||
|
||||
return timeout;
|
||||
}
|
||||
|
||||
static int watchdog_start(struct sch56xx_watchdog_data *data)
|
||||
static int watchdog_start(struct watchdog_device *wddev)
|
||||
{
|
||||
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
|
||||
int ret;
|
||||
u8 val;
|
||||
|
||||
mutex_lock(&data->watchdog_lock);
|
||||
if (!data->addr) {
|
||||
ret = -ENODEV;
|
||||
goto leave_unlock_watchdog;
|
||||
}
|
||||
|
||||
/*
|
||||
* The sch56xx's watchdog cannot really be started / stopped
|
||||
* it is always running, but we can avoid the timer expiring
|
||||
@ -405,39 +354,29 @@ static int watchdog_start(struct sch56xx_watchdog_data *data)
|
||||
|
||||
leave:
|
||||
mutex_unlock(data->io_lock);
|
||||
leave_unlock_watchdog:
|
||||
mutex_unlock(&data->watchdog_lock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int watchdog_trigger(struct sch56xx_watchdog_data *data)
|
||||
static int watchdog_trigger(struct watchdog_device *wddev)
|
||||
{
|
||||
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
|
||||
int ret;
|
||||
|
||||
mutex_lock(&data->watchdog_lock);
|
||||
if (!data->addr) {
|
||||
ret = -ENODEV;
|
||||
goto leave;
|
||||
}
|
||||
|
||||
/* Reset the watchdog countdown counter */
|
||||
mutex_lock(data->io_lock);
|
||||
ret = sch56xx_write_virtual_reg(data->addr, SCH56XX_REG_WDOG_PRESET,
|
||||
data->watchdog_preset);
|
||||
mutex_unlock(data->io_lock);
|
||||
leave:
|
||||
mutex_unlock(&data->watchdog_lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int watchdog_stop_unlocked(struct sch56xx_watchdog_data *data)
|
||||
static int watchdog_stop(struct watchdog_device *wddev)
|
||||
{
|
||||
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
|
||||
int ret = 0;
|
||||
u8 val;
|
||||
|
||||
if (!data->addr)
|
||||
return -ENODEV;
|
||||
|
||||
if (data->watchdog_output_enable & SCH56XX_WDOG_OUTPUT_ENABLE) {
|
||||
val = data->watchdog_output_enable &
|
||||
~SCH56XX_WDOG_OUTPUT_ENABLE;
|
||||
@ -455,184 +394,19 @@ static int watchdog_stop_unlocked(struct sch56xx_watchdog_data *data)
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int watchdog_stop(struct sch56xx_watchdog_data *data)
|
||||
{
|
||||
int ret;
|
||||
|
||||
mutex_lock(&data->watchdog_lock);
|
||||
ret = watchdog_stop_unlocked(data);
|
||||
mutex_unlock(&data->watchdog_lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int watchdog_release(struct inode *inode, struct file *filp)
|
||||
{
|
||||
struct sch56xx_watchdog_data *data = filp->private_data;
|
||||
|
||||
if (data->watchdog_expect_close) {
|
||||
watchdog_stop(data);
|
||||
data->watchdog_expect_close = 0;
|
||||
} else {
|
||||
watchdog_trigger(data);
|
||||
pr_crit("unexpected close, not stopping watchdog!\n");
|
||||
}
|
||||
|
||||
clear_bit(0, &data->watchdog_is_open);
|
||||
|
||||
mutex_lock(&watchdog_data_mutex);
|
||||
kref_put(&data->kref, sch56xx_watchdog_release_resources);
|
||||
mutex_unlock(&watchdog_data_mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int watchdog_open(struct inode *inode, struct file *filp)
|
||||
{
|
||||
struct sch56xx_watchdog_data *pos, *data = NULL;
|
||||
int ret, watchdog_is_open;
|
||||
|
||||
/*
|
||||
* We get called from drivers/char/misc.c with misc_mtx hold, and we
|
||||
* call misc_register() from sch56xx_watchdog_probe() with
|
||||
* watchdog_data_mutex hold, as misc_register() takes the misc_mtx
|
||||
* lock, this is a possible deadlock, so we use mutex_trylock here.
|
||||
*/
|
||||
if (!mutex_trylock(&watchdog_data_mutex))
|
||||
return -ERESTARTSYS;
|
||||
list_for_each_entry(pos, &watchdog_data_list, list) {
|
||||
if (pos->watchdog_miscdev.minor == iminor(inode)) {
|
||||
data = pos;
|
||||
break;
|
||||
}
|
||||
}
|
||||
/* Note we can never not have found data, so we don't check for this */
|
||||
watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
|
||||
if (!watchdog_is_open)
|
||||
kref_get(&data->kref);
|
||||
mutex_unlock(&watchdog_data_mutex);
|
||||
|
||||
if (watchdog_is_open)
|
||||
return -EBUSY;
|
||||
|
||||
filp->private_data = data;
|
||||
|
||||
/* Start the watchdog */
|
||||
ret = watchdog_start(data);
|
||||
if (ret) {
|
||||
watchdog_release(inode, filp);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return nonseekable_open(inode, filp);
|
||||
}
|
||||
|
||||
static ssize_t watchdog_write(struct file *filp, const char __user *buf,
|
||||
size_t count, loff_t *offset)
|
||||
{
|
||||
int ret;
|
||||
struct sch56xx_watchdog_data *data = filp->private_data;
|
||||
|
||||
if (count) {
|
||||
if (!nowayout) {
|
||||
size_t i;
|
||||
|
||||
/* Clear it in case it was set with a previous write */
|
||||
data->watchdog_expect_close = 0;
|
||||
|
||||
for (i = 0; i != count; i++) {
|
||||
char c;
|
||||
if (get_user(c, buf + i))
|
||||
return -EFAULT;
|
||||
if (c == 'V')
|
||||
data->watchdog_expect_close = 1;
|
||||
}
|
||||
}
|
||||
ret = watchdog_trigger(data);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
static long watchdog_ioctl(struct file *filp, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
struct watchdog_info ident = {
|
||||
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
|
||||
.identity = "sch56xx watchdog"
|
||||
};
|
||||
int i, ret = 0;
|
||||
struct sch56xx_watchdog_data *data = filp->private_data;
|
||||
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
ident.firmware_version = data->revision;
|
||||
if (!nowayout)
|
||||
ident.options |= WDIOF_MAGICCLOSE;
|
||||
if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
|
||||
ret = -EFAULT;
|
||||
break;
|
||||
|
||||
case WDIOC_GETSTATUS:
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
ret = put_user(0, (int __user *)arg);
|
||||
break;
|
||||
|
||||
case WDIOC_KEEPALIVE:
|
||||
ret = watchdog_trigger(data);
|
||||
break;
|
||||
|
||||
case WDIOC_GETTIMEOUT:
|
||||
i = watchdog_get_timeout(data);
|
||||
ret = put_user(i, (int __user *)arg);
|
||||
break;
|
||||
|
||||
case WDIOC_SETTIMEOUT:
|
||||
if (get_user(i, (int __user *)arg)) {
|
||||
ret = -EFAULT;
|
||||
break;
|
||||
}
|
||||
ret = watchdog_set_timeout(data, i);
|
||||
if (ret >= 0)
|
||||
ret = put_user(ret, (int __user *)arg);
|
||||
break;
|
||||
|
||||
case WDIOC_SETOPTIONS:
|
||||
if (get_user(i, (int __user *)arg)) {
|
||||
ret = -EFAULT;
|
||||
break;
|
||||
}
|
||||
|
||||
if (i & WDIOS_DISABLECARD)
|
||||
ret = watchdog_stop(data);
|
||||
else if (i & WDIOS_ENABLECARD)
|
||||
ret = watchdog_trigger(data);
|
||||
else
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
|
||||
default:
|
||||
ret = -ENOTTY;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct file_operations watchdog_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.open = watchdog_open,
|
||||
.release = watchdog_release,
|
||||
.write = watchdog_write,
|
||||
.unlocked_ioctl = watchdog_ioctl,
|
||||
static const struct watchdog_ops watchdog_ops = {
|
||||
.owner = THIS_MODULE,
|
||||
.start = watchdog_start,
|
||||
.stop = watchdog_stop,
|
||||
.ping = watchdog_trigger,
|
||||
.set_timeout = watchdog_set_timeout,
|
||||
};
|
||||
|
||||
struct sch56xx_watchdog_data *sch56xx_watchdog_register(
|
||||
struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
|
||||
u16 addr, u32 revision, struct mutex *io_lock, int check_enabled)
|
||||
{
|
||||
struct sch56xx_watchdog_data *data;
|
||||
int i, err, control, output_enable;
|
||||
const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
|
||||
int err, control, output_enable;
|
||||
|
||||
/* Cache the watchdog registers */
|
||||
mutex_lock(io_lock);
|
||||
@ -656,82 +430,53 @@ struct sch56xx_watchdog_data *sch56xx_watchdog_register(
|
||||
return NULL;
|
||||
|
||||
data->addr = addr;
|
||||
data->revision = revision;
|
||||
data->io_lock = io_lock;
|
||||
|
||||
strlcpy(data->wdinfo.identity, "sch56xx watchdog",
|
||||
sizeof(data->wdinfo.identity));
|
||||
data->wdinfo.firmware_version = revision;
|
||||
data->wdinfo.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT;
|
||||
if (!nowayout)
|
||||
data->wdinfo.options |= WDIOF_MAGICCLOSE;
|
||||
|
||||
data->wddev.info = &data->wdinfo;
|
||||
data->wddev.ops = &watchdog_ops;
|
||||
data->wddev.parent = parent;
|
||||
data->wddev.timeout = 60;
|
||||
data->wddev.min_timeout = 1;
|
||||
data->wddev.max_timeout = 255 * 60;
|
||||
if (nowayout)
|
||||
data->wddev.status |= WDOG_NO_WAY_OUT;
|
||||
if (output_enable & SCH56XX_WDOG_OUTPUT_ENABLE)
|
||||
data->wddev.status |= WDOG_ACTIVE;
|
||||
|
||||
/* Since the watchdog uses a downcounter there is no register to read
|
||||
the BIOS set timeout from (if any was set at all) ->
|
||||
Choose a preset which will give us a 1 minute timeout */
|
||||
if (control & SCH56XX_WDOG_TIME_BASE_SEC)
|
||||
data->watchdog_preset = 60; /* seconds */
|
||||
else
|
||||
data->watchdog_preset = 1; /* minute */
|
||||
|
||||
data->watchdog_control = control;
|
||||
data->watchdog_output_enable = output_enable;
|
||||
mutex_init(&data->watchdog_lock);
|
||||
INIT_LIST_HEAD(&data->list);
|
||||
kref_init(&data->kref);
|
||||
|
||||
err = watchdog_set_timeout(data, 60);
|
||||
if (err < 0)
|
||||
goto error;
|
||||
|
||||
/*
|
||||
* We take the data_mutex lock early so that watchdog_open() cannot
|
||||
* run when misc_register() has completed, but we've not yet added
|
||||
* our data to the watchdog_data_list.
|
||||
*/
|
||||
mutex_lock(&watchdog_data_mutex);
|
||||
for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
|
||||
/* Register our watchdog part */
|
||||
snprintf(data->watchdog_name, sizeof(data->watchdog_name),
|
||||
"watchdog%c", (i == 0) ? '\0' : ('0' + i));
|
||||
data->watchdog_miscdev.name = data->watchdog_name;
|
||||
data->watchdog_miscdev.fops = &watchdog_fops;
|
||||
data->watchdog_miscdev.minor = watchdog_minors[i];
|
||||
err = misc_register(&data->watchdog_miscdev);
|
||||
if (err == -EBUSY)
|
||||
continue;
|
||||
if (err)
|
||||
break;
|
||||
|
||||
list_add(&data->list, &watchdog_data_list);
|
||||
pr_info("Registered /dev/%s chardev major 10, minor: %d\n",
|
||||
data->watchdog_name, watchdog_minors[i]);
|
||||
break;
|
||||
}
|
||||
mutex_unlock(&watchdog_data_mutex);
|
||||
|
||||
watchdog_set_drvdata(&data->wddev, data);
|
||||
err = watchdog_register_device(&data->wddev);
|
||||
if (err) {
|
||||
pr_err("Registering watchdog chardev: %d\n", err);
|
||||
goto error;
|
||||
}
|
||||
if (i == ARRAY_SIZE(watchdog_minors)) {
|
||||
pr_warn("Couldn't register watchdog (no free minor)\n");
|
||||
goto error;
|
||||
kfree(data);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return data;
|
||||
|
||||
error:
|
||||
kfree(data);
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL(sch56xx_watchdog_register);
|
||||
|
||||
void sch56xx_watchdog_unregister(struct sch56xx_watchdog_data *data)
|
||||
{
|
||||
mutex_lock(&watchdog_data_mutex);
|
||||
misc_deregister(&data->watchdog_miscdev);
|
||||
list_del(&data->list);
|
||||
mutex_unlock(&watchdog_data_mutex);
|
||||
|
||||
mutex_lock(&data->watchdog_lock);
|
||||
if (data->watchdog_is_open) {
|
||||
pr_warn("platform device unregistered with watchdog "
|
||||
"open! Stopping watchdog.\n");
|
||||
watchdog_stop_unlocked(data);
|
||||
}
|
||||
/* Tell the wdog start/stop/trigger functions our dev is gone */
|
||||
data->addr = 0;
|
||||
data->io_lock = NULL;
|
||||
mutex_unlock(&data->watchdog_lock);
|
||||
|
||||
mutex_lock(&watchdog_data_mutex);
|
||||
kref_put(&data->kref, sch56xx_watchdog_release_resources);
|
||||
mutex_unlock(&watchdog_data_mutex);
|
||||
watchdog_unregister_device(&data->wddev);
|
||||
kfree(data);
|
||||
}
|
||||
EXPORT_SYMBOL(sch56xx_watchdog_unregister);
|
||||
|
||||
|
||||
@ -27,6 +27,6 @@ int sch56xx_read_virtual_reg16(u16 addr, u16 reg);
|
||||
int sch56xx_read_virtual_reg12(u16 addr, u16 msb_reg, u16 lsn_reg,
|
||||
int high_nibble);
|
||||
|
||||
struct sch56xx_watchdog_data *sch56xx_watchdog_register(
|
||||
struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
|
||||
u16 addr, u32 revision, struct mutex *io_lock, int check_enabled);
|
||||
void sch56xx_watchdog_unregister(struct sch56xx_watchdog_data *data);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user