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authorAndrew Jeffery <andrew@aj.id.au>2017-11-30 06:55:24 +0300
committerLinus Walleij <linus.walleij@linaro.org>2017-12-03 00:42:34 +0300
commite10f72bf4b3e8885c1915a119141481e7fc45ca8 (patch)
tree12f85b22ea1e17f9bb38f9cbb61a62da2abe44cd /include/linux/gpio
parente2843cb6cd6ba433d18d87e3e922b6e49ecccf01 (diff)
downloadlinux-e10f72bf4b3e8885c1915a119141481e7fc45ca8.tar.xz
gpio: gpiolib: Generalise state persistence beyond sleep
General support for state persistence is added to gpiolib with the introduction of a new pinconf parameter to propagate the request to hardware. The existing persistence support for sleep is adapted to include hardware support if the GPIO driver provides it. Persistence continues to be enabled by default; in-kernel consumers can opt out, but userspace (currently) does not have a choice. The *_SLEEP_MAY_LOSE_VALUE and *_SLEEP_MAINTAIN_VALUE symbols are renamed, dropping the SLEEP prefix to reflect that the concept is no longer sleep-specific. I feel that renaming to just *_MAY_LOSE_VALUE could initially be misinterpreted, so I've further changed the symbols to *_TRANSITORY and *_PERSISTENT to address this. The sysfs interface is modified only to keep consistency with the chardev interface in enforcing persistence for userspace exports. Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/gpio')
-rw-r--r--include/linux/gpio/consumer.h8
-rw-r--r--include/linux/gpio/machine.h4
2 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 7447d85dbe2f..540b2c142493 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -139,6 +139,7 @@ void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
int *value_array);
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
+int gpiod_set_transitory(struct gpio_desc *desc, bool transitory);
int gpiod_is_active_low(const struct gpio_desc *desc);
int gpiod_cansleep(const struct gpio_desc *desc);
@@ -431,6 +432,13 @@ static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
return -ENOSYS;
}
+static inline int gpiod_set_transitory(struct gpio_desc *desc, bool transitory)
+{
+ /* GPIO can never have been requested */
+ WARN_ON(1);
+ return -ENOSYS;
+}
+
static inline int gpiod_is_active_low(const struct gpio_desc *desc)
{
/* GPIO can never have been requested */
diff --git a/include/linux/gpio/machine.h b/include/linux/gpio/machine.h
index 846be7c69a52..b2f2dc638463 100644
--- a/include/linux/gpio/machine.h
+++ b/include/linux/gpio/machine.h
@@ -10,8 +10,8 @@ enum gpio_lookup_flags {
GPIO_ACTIVE_LOW = (1 << 0),
GPIO_OPEN_DRAIN = (1 << 1),
GPIO_OPEN_SOURCE = (1 << 2),
- GPIO_SLEEP_MAINTAIN_VALUE = (0 << 3),
- GPIO_SLEEP_MAY_LOSE_VALUE = (1 << 3),
+ GPIO_PERSISTENT = (0 << 3),
+ GPIO_TRANSITORY = (1 << 3),
};
/**