gpio: Modify common gpio.h to more closely match Linux
Change "int gp" to "unsigned gpio"
Add request and free entry-points
Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index a1ebb28..c19e16c 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -1,5 +1,6 @@
/*
* Copyright (c) 2011 The Chromium OS Authors.
+ * Copyright (c) 2011, NVIDIA Corp. All rights reserved.
* See file CREDITS for list of people who contributed to this
* project.
*
@@ -19,6 +20,9 @@
* MA 02111-1307 USA
*/
+#ifndef _ASM_GENERIC_GPIO_H_
+#define _ASM_GENERIC_GPIO_H_
+
/*
* Generic GPIO API for U-Boot
*
@@ -36,39 +40,58 @@
* being used by another function. In that case, functions may return
* an error value of -1.
*/
+
+/**
+ * Request ownership of a GPIO.
+ *
+ * @param gpio GPIO number
+ * @param label Name given to the GPIO
+ * @return 0 if ok, -1 on error
+ */
+int gpio_request(unsigned gpio, const char *label);
/**
+ * Stop using the GPIO. This function should not alter pin configuration.
+ *
+ * @param gpio GPIO number
+ * @return 0 if ok, -1 on error
+ */
+int gpio_free(unsigned gpio);
+
+/**
* Make a GPIO an input.
*
- * @param gp GPIO number
+ * @param gpio GPIO number
* @return 0 if ok, -1 on error
*/
-int gpio_direction_input(int gp);
+int gpio_direction_input(unsigned gpio);
/**
* Make a GPIO an output, and set its value.
*
- * @param gp GPIO number
+ * @param gpio GPIO number
* @param value GPIO value (0 for low or 1 for high)
* @return 0 if ok, -1 on error
*/
-int gpio_direction_output(int gp, int value);
+int gpio_direction_output(unsigned gpio, int value);
/**
* Get a GPIO's value. This will work whether the GPIO is an input
* or an output.
*
- * @param gp GPIO number
+ * @param gpio GPIO number
* @return 0 if low, 1 if high, -1 on error
*/
-int gpio_get_value(int gp);
+int gpio_get_value(unsigned gpio);
/**
- * Set an output GPIO's value. The GPIO must already be an output of
+ * Set an output GPIO's value. The GPIO must already be an output or
* this function may have no effect.
*
- * @param gp GPIO number
+ * @param gpio GPIO number
* @param value GPIO value (0 for low or 1 for high)
* @return 0 if ok, -1 on error
*/
-int gpio_set_value(int gp, int value);
+int gpio_set_value(unsigned gpio, int value);
+
+#endif /* _ASM_GENERIC_GPIO_H_ */