Re: [PATCH v2] gpiolib: Export gpiochip_request_own_desc and gpiochip_free_own_desc

From: Guenter Roeck
Date: Tue Jul 22 2014 - 02:53:34 EST


On 07/21/2014 11:43 PM, Mika Westerberg wrote:
On Mon, Jul 21, 2014 at 10:18:25PM -0700, Guenter Roeck 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.

The reason why these are private to drivers is that those are dangerous
if used blindly.

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.

However, you have valid reason above. I wonder if this requires
some documentation in Documentation/gpio/driver.txt?

Sure. Any idea what I should write, or do you want me to come up with something ?

Cc: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v2: Move function declarations from consumer.h to driver.h.

drivers/gpio/gpiolib.c | 2 ++
drivers/gpio/gpiolib.h | 3 ---
include/linux/gpio/driver.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);

EXPORT_SYMBOL_GPL?

Ok.

Thanks,
Guenter

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