| Message ID | 1352326119-7301-1-git-send-email-thierry.reding@avionic-design.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, 7 Nov 2012 23:08:39 +0100, Thierry Reding <thierry.reding@avionic-design.de> wrote: > This function finds the struct backlight_device for a given device tree > node. A dummy function is provided so that it safely compiles out if OF > support is disabled. > > Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Looks okay to me. Reviewed-by: Grant Likely <grant.likely@secretlab.ca> > --- > drivers/video/backlight/backlight.c | 17 +++++++++++++++++ > include/linux/backlight.h | 10 ++++++++++ > 2 files changed, 27 insertions(+) > > diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c > index 297db2f..0d1ed4f 100644 > --- a/drivers/video/backlight/backlight.c > +++ b/drivers/video/backlight/backlight.c > @@ -370,6 +370,23 @@ void backlight_device_unregister(struct backlight_device *bd) > } > EXPORT_SYMBOL(backlight_device_unregister); > > +#if IS_ENABLED(CONFIG_OF) > +static int of_parent_match(struct device *dev, void *data) > +{ > + return dev->parent && dev->parent->of_node == data; > +} > + > +struct backlight_device *of_find_backlight_by_node(struct device_node *node) > +{ > + struct device *dev; > + > + dev = class_find_device(backlight_class, NULL, node, of_parent_match); > + > + return dev ? to_backlight_device(dev) : NULL; > +} > +EXPORT_SYMBOL(of_find_backlight_by_node); > +#endif > + > static void __exit backlight_class_exit(void) > { > class_destroy(backlight_class); > diff --git a/include/linux/backlight.h b/include/linux/backlight.h > index 5ffc6dd..11840e9 100644 > --- a/include/linux/backlight.h > +++ b/include/linux/backlight.h > @@ -134,4 +134,14 @@ struct generic_bl_info { > void (*kick_battery)(void); > }; > > +#if IS_ENABLED(CONFIG_OF) > +struct backlight_device *of_find_backlight_by_node(struct device_node *node); > +#else > +static inline struct backlight_device * > +of_find_backlight_by_node(struct device_node *node) > +{ > + return NULL; > +} > +#endif > + > #endif > -- > 1.8.0 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index 297db2f..0d1ed4f 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -370,6 +370,23 @@ void backlight_device_unregister(struct backlight_device *bd) } EXPORT_SYMBOL(backlight_device_unregister); +#if IS_ENABLED(CONFIG_OF) +static int of_parent_match(struct device *dev, void *data) +{ + return dev->parent && dev->parent->of_node == data; +} + +struct backlight_device *of_find_backlight_by_node(struct device_node *node) +{ + struct device *dev; + + dev = class_find_device(backlight_class, NULL, node, of_parent_match); + + return dev ? to_backlight_device(dev) : NULL; +} +EXPORT_SYMBOL(of_find_backlight_by_node); +#endif + static void __exit backlight_class_exit(void) { class_destroy(backlight_class); diff --git a/include/linux/backlight.h b/include/linux/backlight.h index 5ffc6dd..11840e9 100644 --- a/include/linux/backlight.h +++ b/include/linux/backlight.h @@ -134,4 +134,14 @@ struct generic_bl_info { void (*kick_battery)(void); }; +#if IS_ENABLED(CONFIG_OF) +struct backlight_device *of_find_backlight_by_node(struct device_node *node); +#else +static inline struct backlight_device * +of_find_backlight_by_node(struct device_node *node) +{ + return NULL; +} +#endif + #endif
This function finds the struct backlight_device for a given device tree node. A dummy function is provided so that it safely compiles out if OF support is disabled. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> --- drivers/video/backlight/backlight.c | 17 +++++++++++++++++ include/linux/backlight.h | 10 ++++++++++ 2 files changed, 27 insertions(+)