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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: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Shobhit Kumar 2015-06-26 14:32:04 +05:30 committed by Daniel Vetter
parent 52721d9d33
commit be9015abb8
2 changed files with 14 additions and 0 deletions
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13
drivers/gpio/gpiolib.c
View File

@ -1672,6 +1672,19 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
mutex_unlock(&gpio_lookup_lock); 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, static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
unsigned int idx, unsigned int idx,
enum gpio_lookup_flags *flags) enum gpio_lookup_flags *flags)

1
include/linux/gpio/machine.h
View File

@ -57,5 +57,6 @@ struct gpiod_lookup_table {
} }
void gpiod_add_lookup_table(struct gpiod_lookup_table *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 */ #endif /* __LINUX_GPIO_MACHINE_H */