linux-toradex.git/Documentation/watchdog, branch v3.10.78

watchdog: core: dt: add support for the timeout-sec dt property

2013-03-01T11:48:36+00:00

Add support for watchdog drivers to initialize/set the timeout field
of the watchdog_device structure. The timeout field is initialised
either with the module timeout parameter value (if valid) or with the
timeout-sec dt property (if valid). If both are invalid the initial
value is unchanged.

Signed-off-by: Fabio Porcedda 
Acked-by: Nicolas Ferre 
Signed-off-by: Wim Van Sebroeck

watchdog: fix watchdog-test.c build warning

2012-08-29T15:12:58+00:00

Fix compiler warning by making the function static:

Documentation/watchdog/src/watchdog-test.c:34:6: warning: no previous prototype for 'term'

Signed-off-by: Randy Dunlap 
Signed-off-by: Wim Van Sebroeck

Watchdog: DA9052/53 PMIC watchdog support

2012-05-30T05:56:12+00:00

This driver adds support for the watchdog functionality provided by
the Dialog Semiconductor DA9052 PMIC chip.

Tested on samsung smdkv6410 and i.mx53 QS boards.

Signed-off-by: Anthony Olech 
Signed-off-by: Ashish Jangam 
Signed-off-by: Wim Van Sebroeck

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 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

Documentation/watchdog: Fix the file descriptor leak when no cmdline arg given

2012-05-23T14:27:48+00:00

we start a infinite loop when user gives ./watchdog-test, and when user
ctrl + c's the program, we just exit immeadiately with out closing the
filedescriptor of the watchdog device. a signal handler is used to
do the job of closing the filedescriptor and exiting the program.

Signed-off-by: Devendra Naga 
Signed-off-by: Wim Van Sebroeck

Documentation/watchdog: close the fd when cmdline arg given

2012-05-23T14:27:40+00:00

in the watchdog test code, the ioctl is performed on the watchdog device
and just doing exit(0) so we leak a filedescripor.

Signed-off-by: Devendra Naga 
Signed-off-by: Wim Van Sebroeck

Documentation/watchdog: Fix a small typo

2012-05-23T14:27:00+00:00

Signed-off-by: Devendra Naga 
Signed-off-by: Wim Van Sebroeck