linux-kernel - [PATCH] gpiolib: Export gpiochip_request_own_desc and gpiochip_free_own

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Date:	Mon, 21 Jul 2014 21:26:34 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-gpio@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH] gpiolib: Export gpiochip_request_own_desc and gpiochip_free_own_desc

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);
+
 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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