To prevent removing if NOWAYOUT, we invalidate the .remove function and
suppress the bind/unbind attributes in sysfs. These are driver
capabilities, so we need to set it up at runtime during init. To avoid
boilerplate, introduce module_watchdog_driver() similar to
module_driver(). On top of that, we then build
module_watchdog_platform_driver(). Others may follow, if needed.
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/watchdog.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 44985c4a1e86..5768fb6b5cde 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -216,4 +216,24 @@ extern void watchdog_unregister_device(struct watchdog_device *);
/* devres register variant */
int devm_watchdog_register_device(struct device *dev, struct watchdog_device *);
+#define module_watchdog_driver(__driver, __register, __unregister, __nowayout, ...) \
+static int __init __driver##_init(void) \
+{ \
+ if (__nowayout) { \
+ __driver.driver.suppress_bind_attrs = true; \
+ __driver.remove = NULL; \
+ } \
+ return __register(&(__driver) ##__VA_ARGS__); \
+} \
+module_init(__driver##_init); \
+static void __exit __driver##_exit(void) \
+{ \
+ __unregister(&(__driver), ##__VA_ARGS__); \
+} \
+module_exit(__driver##_exit)
+
+#define module_watchdog_platform_driver(__platform_driver, __nowayout) \
+ module_watchdog_driver(__platform_driver, platform_driver_register, \
+ platform_driver_unregister, __nowayout)
+
#endif /* ifndef _LINUX_WATCHDOG_H */
--
2.11.0
