linux-kernel - [patch 2.6.20-rc1 2/6] OMAP GPIO wrappers

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Message-Id: <200612201309.45366.david-b@pacbell.net>
Date:	Wed, 20 Dec 2006 13:09:44 -0800
From:	David Brownell <david-b@...bell.net>
To:	Linux Kernel list <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...l.org>,
	Andrew Victor <andrew@...people.com>,
	Bill Gatliff <bgat@...lgatliff.com>,
	Haavard Skinnemoen <hskinnemoen@...el.com>, jamey.hicks@...com,
	Kevin Hilman <khilman@...sta.com>,
	Nicolas Pitre <nico@....org>,
	Russell King <rmk@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>,
	pHilipp Zabel <philipp.zabel@...il.com>
Subject: [patch 2.6.20-rc1 2/6] OMAP GPIO wrappers

This teaches OMAP how to implement the cross-platform GPIO interfaces.

Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>


Index: at91/include/asm-arm/arch-omap/gpio.h
===================================================================
--- at91.orig/include/asm-arm/arch-omap/gpio.h	2006-12-19 01:45:33.000000000 -0800
+++ at91/include/asm-arm/arch-omap/gpio.h	2006-12-19 02:06:11.000000000 -0800
@@ -76,4 +76,58 @@ extern void omap_set_gpio_direction(int 
 extern void omap_set_gpio_dataout(int gpio, int enable);
 extern int omap_get_gpio_datain(int gpio);
 
+/*-------------------------------------------------------------------------*/
+
+/* wrappers for "new style" GPIO calls. the old OMAP-specfic ones should
+ * eventually be removed (along with this errno.h inclusion), and maybe
+ * gpios should put MPUIOs last too.
+ */
+
+#include <asm/errno.h>
+
+static inline int gpio_request(unsigned gpio, const char *label)
+	{ return omap_request_gpio(gpio); }
+
+static inline void gpio_free(unsigned gpio)
+	{ omap_free_gpio(gpio); }
+
+
+static inline int __gpio_set_direction(unsigned gpio, int is_input)
+{
+	if (cpu_class_is_omap2()) {
+		if (gpio > OMAP_MAX_GPIO_LINES)
+			return -EINVAL;
+	} else {
+		if (gpio > (OMAP_MAX_GPIO_LINES + 16 /* MPUIO */))
+			return -EINVAL;
+	}
+	omap_set_gpio_direction(gpio, is_input);
+	return 0;
+}
+
+static inline int gpio_direction_input(unsigned gpio)
+	{ return __gpio_set_direction(gpio, 1); }
+
+static inline int gpio_direction_output(unsigned gpio)
+	{ return __gpio_set_direction(gpio, 0); }
+
+
+static inline int gpio_get_value(unsigned gpio)
+	{ return omap_get_gpio_datain(gpio); }
+
+static inline void gpio_set_value(unsigned gpio, int value)
+	{ omap_set_gpio_dataout(gpio, value); }
+
+#include <asm-generic/gpio.h>		/* cansleep wrappers */
+
+static inline int gpio_to_irq(unsigned gpio)
+	{ return OMAP_GPIO_IRQ(gpio); }
+
+static inline int irq_to_gpio(unsigned irq)
+{
+	if (cpu_class_is_omap1() && (irq < (IH_MPUIO_BASE + 16)))
+		return (irq - IH_MPUIO_BASE) + OMAP_MAX_GPIO_LINES;
+	return irq - IH_GPIO_BASE;
+}
+
 #endif
-
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