On Fri, 24 Apr 2015, Shobhit Kumar <shobhit.kumar@xxxxxxxxx> wrote:
> 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
>
> v2: Ccing maintainers
Shobhit, please resend to linux-gpio@xxxxxxxxxxxxxxx and
linux-kernel@xxxxxxxxxxxxxxx in addition to the maintainers, with
Alexandre's r-b added.
BR,
Jani.
>
> Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
> Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
> Cc: Alexandre Courbot <gnurou@xxxxxxxxx>
> Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
> Signed-off-by: Shobhit Kumar <shobhit.kumar@xxxxxxxxx>
> ---
> drivers/gpio/gpiolib.c | 13 +++++++++++++
> include/linux/gpio/machine.h | 1 +
> 2 files changed, 14 insertions(+)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 59eaa23..2420af9 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1658,6 +1658,19 @@ 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)
> diff --git a/include/linux/gpio/machine.h b/include/linux/gpio/machine.h
> index e270614..c0d712d 100644
> --- a/include/linux/gpio/machine.h
> +++ b/include/linux/gpio/machine.h
> @@ -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 */
> --
> 2.1.0
>
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
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--
Jani Nikula, Intel Open Source Technology Center
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