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Date:	Tue, 22 Jul 2014 13:42:10 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH] gpiolib: Export gpiochip_request_own_desc and gpiochip_free_own_desc

On Tue, Jul 22, 2014 at 1:26 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> Both functions were introduced to let gpio drivers request their own
> gpio pins. Without exporting the functions, this can however only be
> used by gpio drivers built into the kernel.
>
> Secondary impact is that the functions can not currently be used by
> platform initialization code associated with the gpio-pca953x driver.
> This code permits auto-export of gpio pins through platform data, but
> if this functionality is used, the module can no longer be unloaded due
> to the problem solved with the introduction of gpiochip_request_own_desc
> and gpiochip_free_own_desc.
>
> Export both function so they can be used from modules and from
> platform initialization code.
>
> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  drivers/gpio/gpiolib.c        | 2 ++
>  drivers/gpio/gpiolib.h        | 3 ---
>  include/linux/gpio/consumer.h | 3 +++
>  3 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 43d9e34..04c647e 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1953,6 +1953,7 @@ int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label)
>
>         return __gpiod_request(desc, label);
>  }
> +EXPORT_SYMBOL(gpiochip_request_own_desc);
>
>  /**
>   * gpiochip_free_own_desc - Free GPIO requested by the chip driver
> @@ -1966,6 +1967,7 @@ void gpiochip_free_own_desc(struct gpio_desc *desc)
>         if (desc)
>                 __gpiod_free(desc);
>  }
> +EXPORT_SYMBOL(gpiochip_free_own_desc);
>
>  /* Drivers MUST set GPIO direction before making get/set calls.  In
>   * some cases this is done in early boot, before IRQs are enabled.
> diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
> index 1a4103d..2bdb69d 100644
> --- a/drivers/gpio/gpiolib.h
> +++ b/drivers/gpio/gpiolib.h
> @@ -45,9 +45,6 @@ acpi_get_gpiod_by_index(struct device *dev, int index,
>  }
>  #endif
>
> -int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label);
> -void gpiochip_free_own_desc(struct gpio_desc *desc);
> -
>  struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
>                    const char *list_name, int index, enum of_gpio_flags *flags);
>
> diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
> index 05e53cc..e85f7e6 100644
> --- a/include/linux/gpio/consumer.h
> +++ b/include/linux/gpio/consumer.h
> @@ -32,6 +32,9 @@ struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
>
>  void gpiod_put(struct gpio_desc *desc);
>
> +int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label);
> +void gpiochip_free_own_desc(struct gpio_desc *desc);

I guess these functions should be made public in driver.h, not
consumer.h. Users will be GPIO drivers and platform code, not device
drivers which are the typical consumers of GPIOs.

> +
>  struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
>                                               const char *con_id);
>  struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
> --
> 1.9.1
>
--
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