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Commit be9015ab authored by Shobhit Kumar's avatar Shobhit Kumar Committed by Daniel Vetter
Browse files

gpiolib: Add support for removing registered consumer lookup table 



In case we unload and load a driver module again that is registering a
lookup table, without this it will result in multiple entries. Provide
an option to remove the lookup table on driver unload

Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Reviewed-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Tested-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarShobhit Kumar <shobhit.kumar@intel.com>
Acked-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 52721d9d

drivers/gpio/gpiolib.c

+13 −0
Original line number Diff line number Diff line
@@ -1672,6 +1672,19 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table *table) 
	mutex_unlock(&gpio_lookup_lock);

}



/**

 * gpiod_remove_lookup_table() - unregister GPIO device consumers

 * @table: table of consumers to unregister

 */

void gpiod_remove_lookup_table(struct gpiod_lookup_table *table)

{

	mutex_lock(&gpio_lookup_lock);



	list_del(&table->list);



	mutex_unlock(&gpio_lookup_lock);

}



static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,

				      unsigned int idx,

				      enum gpio_lookup_flags *flags)

include/linux/gpio/machine.h

+1 −0
Original line number Diff line number Diff line
@@ -57,5 +57,6 @@ struct gpiod_lookup_table { 
}



void gpiod_add_lookup_table(struct gpiod_lookup_table *table);

void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);



#endif /* __LINUX_GPIO_MACHINE_H */