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authorLaxman Dewangan <ldewangan@nvidia.com>2012-02-17 20:26:22 +0530
committerGrant Likely <grant.likely@secretlab.ca>2012-03-05 07:49:44 -0700
commit25553ff0756c59b617af6bdd280c94e943164184 (patch)
tree6ca9ec045b5d2e10523fdf46facac59aa683f4ce /include/linux/gpio.h
parentaca5ce14eb773a75e5d935968b2e390dc5bd29c3 (diff)
downloadop-kernel-dev-25553ff0756c59b617af6bdd280c94e943164184.zip
op-kernel-dev-25553ff0756c59b617af6bdd280c94e943164184.tar.gz
gpio: gpiolib: Support for open source/emitter gpios
Adding support for the open source gpio on which client can specify the open source property through GPIO flag GPIOF_OPEN_SOURCE at the time of gpio request. The open source pins are normally pulled low and it cannot be driven to output with value of 0 and so when client request for setting the pin to LOW, the gpio will be set to input direction to make pin in tristate and hence PULL-DOWN on pins will make the state to LOW. The open source pin can be driven to HIGH by setting output with value of 1. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'include/linux/gpio.h')
-rw-r--r--include/linux/gpio.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 66a5b2e..67851bb 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -17,6 +17,9 @@
/* Gpio pin is open drain */
#define GPIOF_OPEN_DRAIN (1 << 2)
+/* Gpio pin is open source */
+#define GPIOF_OPEN_SOURCE (1 << 3)
+
/**
* struct gpio - a structure describing a GPIO with configuration
* @gpio: the GPIO number
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