From: Guenter Roeck Date: Mon, 21 Jul 2014 18:12:16 +0000 (-0700) Subject: gpio: Add support for GPIOF_ACTIVE_LOW to gpio_request_one functions X-Git-Tag: omap-for-v3.17/fixes-against-rc2~114^2~15 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2be001739242fac1083f3b21898158492844699d;p=pandora-kernel.git gpio: Add support for GPIOF_ACTIVE_LOW to gpio_request_one functions The gpio include file and the gpio documentation declare and document GPIOF_ACTIVE_LOW as one of the flags to be passed to gpio_request_one and related functions. However, the flag is not evaluated or used. This can cause problems in at least two areas: First, the same API can be used to auto-export pins to user space. The missing support for GPIOF_ACTIVE_LOW results in unexpected behavior for such auto-exported pins. Second, the requested gpio pin can be convered for use by gpiod functions with gpio_to_desc(). While gpio API functions do not support GPIOF_ACTIVE_LOW, gpiod functions do, which again results in unexpected behavior. Check the flag in gpio_request_one and set the gpio internal flag FLAG_ACTIVE_LOW if it is set to address those problems. Signed-off-by: Guenter Roeck Reviewed-by: Alexandre Courbot Signed-off-by: Linus Walleij --- Reading git-diff-tree failed