linux-toradex.git/include/linux/watchdog.h, branch v4.11-rc3

watchdog: Introduce watchdog_stop_on_unregister helper

2017-02-24T22:00:23+00:00

Many watchdog drivers explicitly stop the watchdog when unregistering it.
While it is unclear if this is actually needed (the whatdog should not be
running at that time if it can be stopped), introduce a helper to
explicitly stop the watchdog in the watchdog core when unregistering it.
This helps reducing driver code size while retaining functionality.

Signed-off-by: Guenter Roeck

watchdog: add watchdog pretimeout governor framework

2016-10-08T08:27:10+00:00

The change adds a simple watchdog pretimeout framework infrastructure,
its purpose is to allow users to select a desired handling of watchdog
pretimeout events, which may be generated by some watchdog devices.

A user selects a default watchdog pretimeout governor during
compilation stage.

Watchdogs with WDIOF_PRETIMEOUT capability now have one more device
attribute in sysfs, pretimeout_governor attribute is intended to display
the selected watchdog pretimeout governor.

The framework has no impact at runtime on watchdog devices with no
WDIOF_PRETIMEOUT capability set.

Signed-off-by: Vladimir Zapolskiy 
Reviewed-by: Guenter Roeck 
Reviewed-by: Wolfram Sang 
Tested-by: Wolfram Sang 
Signed-off-by: Guenter Roeck 
Signed-off-by: Wim Van Sebroeck

watchdog: add pretimeout support to the core

2016-09-24T07:27:15+00:00

Since the watchdog framework centrializes the IOCTL interfaces of device
drivers now, SETPRETIMEOUT and GETPRETIMEOUT need to be added in the
common code.

Signed-off-by: Robin Gong 
Signed-off-by: Wolfram Sang 
[vzapolskiy: added conditional pretimeout sysfs attribute visibility]
Signed-off-by: Vladimir Zapolskiy 
Reviewed-by: Guenter Roeck 
Signed-off-by: Guenter Roeck 
Signed-off-by: Wim Van Sebroeck

watchdog: Improve description of min_hw_heartbeat_ms

2016-07-17T19:00:14+00:00

The description of min_hw_heartbeat_ms is misleading and needs some
improvements.

Signed-off-by: Guenter Roeck 
Signed-off-by: Wim Van Sebroeck

watchdog: Add a device managed API for watchdog_register_device()

2016-07-17T18:52:40+00:00

This helps in reducing code in .remove callbacks and sometimes
dropping .remove callbacks entirely.

Signed-off-by: Neil Armstrong 
Signed-off-by: Guenter Roeck 
Signed-off-by: Wim Van Sebroeck

watchdog: Add support for minimum time between heartbeats

2016-03-16T20:11:19+00:00

Some watchdogs require a minimum time between heartbeats.
Examples are the watchdogs in DA9062 and AT91SAM9x.

Signed-off-by: Guenter Roeck 
Signed-off-by: Wim Van Sebroeck

watchdog: Introduce WDOG_HW_RUNNING flag

2016-03-16T20:11:15+00:00

The WDOG_HW_RUNNING flag is expected to be set by watchdog drivers if
the hardware watchdog is running. If the flag is set, the watchdog
subsystem will ping the watchdog even if the watchdog device is closed.

The watchdog driver stop function is now optional and may be omitted
if the watchdog can not be stopped. If stopping the watchdog is not
possible but the driver implements a stop function, it is responsible
to set the WDOG_HW_RUNNING flag in its stop function.

Signed-off-by: Guenter Roeck 
Signed-off-by: Wim Van Sebroeck

watchdog: Introduce hardware maximum heartbeat in watchdog core

2016-03-16T20:11:14+00:00

Introduce an optional hardware maximum heartbeat in the watchdog core.
The hardware maximum heartbeat can be lower than the maximum timeout.

Drivers can set the maximum hardware heartbeat value in the watchdog data
structure. If the configured timeout exceeds the maximum hardware heartbeat,
the watchdog core enables a timer function to assist sending keepalive
requests to the watchdog driver.

Signed-off-by: Guenter Roeck 
Signed-off-by: Wim Van Sebroeck

watchdog: Add 'action' and 'data' parameters to restart handler callback

2016-03-01T14:36:35+00:00

The 'action' (or restart mode) and data parameters may be used by restart
handlers, so they should be passed to the restart callback functions.

Cc: Sylvain Lemieux 
Signed-off-by: Guenter Roeck 
Signed-off-by: Wim Van Sebroeck

watchdog: Drop pointer to watchdog device from struct watchdog_device

2016-01-11T20:53:59+00:00

The lifetime of the watchdog device pointer is different from the lifetime
of its character device. Remove it entirely to avoid race conditions.

Signed-off-by: Guenter Roeck 
Signed-off-by: Guenter Roeck 
Signed-off-by: Wim Van Sebroeck