mm: Don't pin ZERO_PAGE in pin_user_pages()

[linux-block.git] / include / linux / gpio.h

diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 85beb236c925bf27d4f3d24773e48cb6a1777294..8528353e073b652c7585c4b6f78cda43cd303af8 100644 (file)
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -12,7 +12,9 @@
 #ifndef __LINUX_GPIO_H
 #define __LINUX_GPIO_H
 
-#include <linux/errno.h>
+#include <linux/types.h>
+
+struct device;
 
 /* see Documentation/driver-api/gpio/legacy.rst */
 
@@ -55,50 +57,94 @@ struct gpio {
 
 #ifdef CONFIG_GPIOLIB
 
-#ifdef CONFIG_ARCH_HAVE_CUSTOM_GPIO_H
-#include <asm/gpio.h>
-#else
+#include <linux/gpio/consumer.h>
+
+/*
+ * "valid" GPIO numbers are nonnegative and may be passed to
+ * setup routines like gpio_request().  Only some valid numbers
+ * can successfully be requested and used.
+ *
+ * Invalid GPIO numbers are useful for indicating no-such-GPIO in
+ * platform data and other tables.
+ */
+static inline bool gpio_is_valid(int number)
+{
+       /* only non-negative numbers are valid */
+       return number >= 0;
+}
+
+/*
+ * Platforms may implement their GPIO interface with library code,
+ * at a small performance cost for non-inlined operations and some
+ * extra memory (for code and for per-GPIO table entries).
+ */
+
+/*
+ * At the end we want all GPIOs to be dynamically allocated from 0.
+ * However, some legacy drivers still perform fixed allocation.
+ * Until they are all fixed, leave 0-512 space for them.
+ */
+#define GPIO_DYNAMIC_BASE      512
 
-#include <asm-generic/gpio.h>
+/* Always use the library code for GPIO management calls,
+ * or when sleeping may be involved.
+ */
+int gpio_request(unsigned gpio, const char *label);
+void gpio_free(unsigned gpio);
 
-static inline int gpio_get_value(unsigned int gpio)
+static inline int gpio_direction_input(unsigned gpio)
+{
+       return gpiod_direction_input(gpio_to_desc(gpio));
+}
+static inline int gpio_direction_output(unsigned gpio, int value)
+{
+       return gpiod_direction_output_raw(gpio_to_desc(gpio), value);
+}
+
+static inline int gpio_get_value_cansleep(unsigned gpio)
+{
+       return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio));
+}
+static inline void gpio_set_value_cansleep(unsigned gpio, int value)
 {
-       return __gpio_get_value(gpio);
+       return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value);
 }
 
-static inline void gpio_set_value(unsigned int gpio, int value)
+static inline int gpio_get_value(unsigned gpio)
 {
-       __gpio_set_value(gpio, value);
+       return gpiod_get_raw_value(gpio_to_desc(gpio));
+}
+static inline void gpio_set_value(unsigned gpio, int value)
+{
+       return gpiod_set_raw_value(gpio_to_desc(gpio), value);
 }
 
-static inline int gpio_cansleep(unsigned int gpio)
+static inline int gpio_cansleep(unsigned gpio)
 {
-       return __gpio_cansleep(gpio);
+       return gpiod_cansleep(gpio_to_desc(gpio));
 }
 
-static inline int gpio_to_irq(unsigned int gpio)
+static inline int gpio_to_irq(unsigned gpio)
 {
-       return __gpio_to_irq(gpio);
+       return gpiod_to_irq(gpio_to_desc(gpio));
 }
 
-#endif /* ! CONFIG_ARCH_HAVE_CUSTOM_GPIO_H */
+int gpio_request_one(unsigned gpio, unsigned long flags, const char *label);
+int gpio_request_array(const struct gpio *array, size_t num);
+void gpio_free_array(const struct gpio *array, size_t num);
 
 /* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */
 
-struct device;
-
 int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
 int devm_gpio_request_one(struct device *dev, unsigned gpio,
                          unsigned long flags, const char *label);
 
 #else /* ! CONFIG_GPIOLIB */
 
-#include <linux/bug.h>
 #include <linux/kernel.h>
-#include <linux/types.h>
 
-struct device;
-struct gpio_chip;
+#include <asm/bug.h>
+#include <asm/errno.h>
 
 static inline bool gpio_is_valid(int number)
 {
@@ -147,11 +193,6 @@ static inline int gpio_direction_output(unsigned gpio, int value)
        return -ENOSYS;
 }
 
-static inline int gpio_set_debounce(unsigned gpio, unsigned debounce)
-{
-       return -ENOSYS;
-}
-
 static inline int gpio_get_value(unsigned gpio)
 {
        /* GPIO can never have been requested or set as {in,out}put */
@@ -185,19 +226,6 @@ static inline void gpio_set_value_cansleep(unsigned gpio, int value)
        WARN_ON(1);
 }
 
-static inline int gpio_export(unsigned gpio, bool direction_may_change)
-{
-       /* GPIO can never have been requested or set as {in,out}put */
-       WARN_ON(1);
-       return -EINVAL;
-}
-
-static inline void gpio_unexport(unsigned gpio)
-{
-       /* GPIO can never have been exported */
-       WARN_ON(1);
-}
-
 static inline int gpio_to_irq(unsigned gpio)
 {
        /* GPIO can never have been requested or set as input */