linux-toradex.git/include/linux/watchdog.h, branch v3.7.3

UAPI: (Scripted) Disintegrate include/linux

2012-10-13T09:46:48+00:00

Signed-off-by: David Howells 
Acked-by: Arnd Bergmann 
Acked-by: Thomas Gleixner 
Acked-by: Michael Kerrisk 
Acked-by: Paul E. McKenney 
Acked-by: Dave Jones

watchdog: Add support for dynamically allocated watchdog_device structs

2012-05-30T05:55:31+00:00

If a driver's watchdog_device struct is part of a dynamically allocated
struct (which it often will be), merely locking the module is not enough,
even with a drivers module locked, the driver can be unbound from the device,
examples:
1) The root user can unbind it through sysfd
2) The i2c bus master driver being unloaded for an i2c watchdog

I will gladly admit that these are corner cases, but we still need to handle
them correctly.

The fix for this consists of 2 parts:
1) Add ref / unref operations, so that the driver can refcount the struct
   holding the watchdog_device struct and delay freeing it until any
   open filehandles referring to it are closed
2) Most driver operations will do IO on the device and the driver should not
   do any IO on the device after it has been unbound. Rather then letting each
   driver deal with this internally, it is better to ensure at the watchdog
   core level that no operations (other then unref) will get called after
   the driver has called watchdog_unregister_device(). This actually is the
   bulk of this patch.

Signed-off-by: Hans de Goede 
Signed-off-by: Wim Van Sebroeck

watchdog: Add Locking support

2012-05-30T05:55:23+00:00

This patch fixes some potential multithreading issues, despite only
allowing one process to open the /dev/watchdog device, we can still get
called multiple times at the same time, since a program could be using thread,
or could share the fd after a fork.

This causes 2 potential problems:
1) watchdog_start / open do an unlocked test_n_set / test_n_clear,
   if these 2 race, the watchdog could be stopped while the active
   bit indicates it is running or visa versa.

2) Most watchdog_dev drivers probably assume that only one
   watchdog-op will get called at a time, this is not necessary
   true atm.

Signed-off-by: Hans de Goede 
Signed-off-by: Wim Van Sebroeck

watchdog: create all the proper device files

2012-05-30T05:54:46+00:00

Create the watchdog class and it's associated devices.

Signed-off-by: Alan Cox 
Signed-off-by: Hans de Goede 
Signed-off-by: Wim Van Sebroeck

watchdog: Add a flag to indicate the watchdog doesn't reboot things

2012-05-30T05:54:40+00:00

Some watchdogs merely trigger external alarms and controls. In a managed
environment this is very useful but we want drivers to be able to figure
out which is which now multiple dogs can be loaded. Thus add an ALARMONLY
feature flag.

Signed-off-by: Alan Cox 
Signed-off-by: Hans de Goede 
Signed-off-by: Wim Van Sebroeck

watchdog: Add multiple device support

2012-05-30T05:54:25+00:00

We keep the old /dev/watchdog interface file for the first watchdog via
miscdev. This is basically a cut and paste of the relevant interface code
from the rtc driver layer tweaked for watchdog.

Revised to fix problems noted by Hans de Goede

Signed-off-by: Alan Cox 
Signed-off-by: Hans de Goede 
Signed-off-by: Tomas Winkler 
Signed-off-by: Wim Van Sebroeck

watchdog: Add watchdog_active() routine

2012-05-30T05:53:46+00:00

Some watchdog may need to check if watchdog is ACTIVE or not, for example in
their suspend/resume hooks.

This patch adds this routine and changes the core drivers to use it.

Signed-off-by: Viresh Kumar 
Signed-off-by: Wim Van Sebroeck

watchdog: Add support for WDIOC_GETTIMELEFT IOCTL in watchdog core

2012-03-27T18:15:37+00:00

This patch adds support for WDIOC_GETTIMELEFT IOCTL in watchdog core. So, there
is another function pointer added to struct watchdog_ops, which can be passed by
drivers to support this IOCTL.

Related documentation is updated too.

Signed-off-by: Viresh Kumar 
Signed-off-by: Linus Walleij 
Signed-off-by: Wim Van Sebroeck

watchdog: nowayout is bool

2012-03-27T18:06:02+00:00

nowayout is actually a boolean value.
So make it bool for all watchdog device drivers.

Signed-off-by: Wim Van Sebroeck

watchdog: add nowayout helpers to Watchdog Timer Driver Kernel API

2012-01-06T14:22:04+00:00

Add two nowayout helpers for the Watchdog Timer Driver Kernel API.
And apply this to the already converted drivers.
Note: s3c2410_wdt lost the nowayout feature during the conversion.

Reviewed-by: Wolfram Sang 
Acked-by: Mark Brown 
Signed-off-by: Wim Van Sebroeck