path: root/target/linux/omap24xx/patches-3.1/200-omap-platform.patch

Index: linux-3.1/arch/arm/plat-omap/bootreason.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-3.1/arch/arm/plat-omap/bootreason.c	2011-10-30 00:48:34.877053219 +0200
@@ -0,0 +1,79 @@
+/*
+ * linux/arch/arm/plat-omap/bootreason.c
+ *
+ * OMAP Bootreason passing
+ *
+ * Copyright (c) 2004 Nokia
+ *
+ * Written by David Weinehall <david.weinehall@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/proc_fs.h>
+#include <linux/errno.h>
+#include <plat/board.h>
+
+static char boot_reason[16];
+
+static int omap_bootreason_read_proc(char *page, char **start, off_t off,
+					 int count, int *eof, void *data)
+{
+	int len = 0;
+
+	len += sprintf(page + len, "%s\n", boot_reason);
+
+	*start = page + off;
+
+	if (len > off)
+		len -= off;
+	else
+		len = 0;
+
+	return len < count ? len  : count;
+}
+
+static int __init bootreason_init(void)
+{
+	const struct omap_boot_reason_config *cfg;
+	int reason_valid = 0;
+
+	cfg = omap_get_config(OMAP_TAG_BOOT_REASON, struct omap_boot_reason_config);
+	if (cfg != NULL) {
+		strncpy(boot_reason, cfg->reason_str, sizeof(cfg->reason_str));
+		boot_reason[sizeof(cfg->reason_str)] = 0;
+		reason_valid = 1;
+	} else {
+		/* Read the boot reason from the OMAP registers */
+	}
+
+	if (!reason_valid)
+		return -ENOENT;
+
+	printk(KERN_INFO "Bootup reason: %s\n", boot_reason);
+
+	if (!create_proc_read_entry("bootreason", S_IRUGO, NULL,
+					omap_bootreason_read_proc, NULL))
+		return -ENOMEM;
+
+	return 0;
+}
+
+late_initcall(bootreason_init);
Index: linux-3.1/arch/arm/plat-omap/common.c
===================================================================
--- linux-3.1.orig/arch/arm/plat-omap/common.c	2011-10-30 00:48:32.781054651 +0200
+++ linux-3.1/arch/arm/plat-omap/common.c	2011-10-30 00:48:34.877053219 +0200
@@ -21,18 +21,90 @@
 #include <plat/vram.h>
 #include <plat/dsp.h>
 
+#include <asm/setup.h>
+
 
 #define NO_LENGTH_CHECK 0xffffffff
 
 struct omap_board_config_kernel *omap_board_config __initdata;
 int omap_board_config_size;
 
+unsigned char omap_bootloader_tag[1024];
+int omap_bootloader_tag_len;
+
+/* used by omap-smp.c and board-4430sdp.c */
+void __iomem *gic_cpu_base_addr;
+
+#ifdef CONFIG_OMAP_BOOT_TAG
+
+static int __init parse_tag_omap(const struct tag *tag)
+{
+	u32 size = tag->hdr.size - (sizeof(tag->hdr) >> 2);
+
+        size <<= 2;
+	if (size > sizeof(omap_bootloader_tag))
+		return -1;
+
+	memcpy(omap_bootloader_tag, tag->u.omap.data, size);
+	omap_bootloader_tag_len = size;
+
+        return 0;
+}
+
+__tagtable(ATAG_BOARD, parse_tag_omap);
+
+#endif
+
 static const void *__init get_config(u16 tag, size_t len,
 		int skip, size_t *len_out)
 {
 	struct omap_board_config_kernel *kinfo = NULL;
 	int i;
 
+#ifdef CONFIG_OMAP_BOOT_TAG
+	struct omap_board_config_entry *info = NULL;
+
+	if (omap_bootloader_tag_len > 4)
+		info = (struct omap_board_config_entry *) omap_bootloader_tag;
+	while (info != NULL) {
+		u8 *next;
+
+		if (info->tag == tag) {
+			if (skip == 0)
+				break;
+			skip--;
+		}
+
+		if ((info->len & 0x03) != 0) {
+			/* We bail out to avoid an alignment fault */
+			printk(KERN_ERR "OMAP peripheral config: Length (%d) not word-aligned (tag %04x)\n",
+			       info->len, info->tag);
+			return NULL;
+		}
+		next = (u8 *) info + sizeof(*info) + info->len;
+		if (next >= omap_bootloader_tag + omap_bootloader_tag_len)
+			info = NULL;
+		else
+			info = (struct omap_board_config_entry *) next;
+	}
+	if (info != NULL) {
+		/* Check the length as a lame attempt to check for
+		 * binary inconsistency. */
+		if (len != NO_LENGTH_CHECK) {
+			/* Word-align len */
+			if (len & 0x03)
+				len = (len + 3) & ~0x03;
+			if (info->len != len) {
+				printk(KERN_ERR "OMAP peripheral config: Length mismatch with tag %x (want %d, got %d)\n",
+				       tag, len, info->len);
+				return NULL;
+			}
+		}
+		if (len_out != NULL)
+			*len_out = info->len;
+		return info->data;
+	}
+#endif
 	/* Try to find the config from the board-specific structures
 	 * in the kernel. */
 	for (i = 0; i < omap_board_config_size; i++) {
Index: linux-3.1/arch/arm/plat-omap/component-version.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-3.1/arch/arm/plat-omap/component-version.c	2011-10-30 00:48:34.877053219 +0200
@@ -0,0 +1,64 @@
+/*
+ *  linux/arch/arm/plat-omap/component-version.c
+ *
+ *  Copyright (C) 2005 Nokia Corporation
+ *  Written by Juha Yrjölä <juha.yrjola@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/proc_fs.h>
+#include <plat/board.h>
+
+static int component_version_read_proc(char *page, char **start, off_t off,
+				       int count, int *eof, void *data)
+{
+	int len, i;
+	const struct omap_version_config *ver;
+	char *p;
+
+	i = 0;
+	p = page;
+	while ((ver = omap_get_nr_config(OMAP_TAG_VERSION_STR,
+					 struct omap_version_config, i)) != NULL) {
+		p += sprintf(p, "%-12s%s\n", ver->component, ver->version);
+		i++;
+	}
+
+	len = (p - page) - off;
+	if (len < 0)
+		len = 0;
+
+	*eof = (len <= count) ? 1 : 0;
+	*start = page + off;
+
+	return len;
+}
+
+static int __init component_version_init(void)
+{
+	if (omap_get_config(OMAP_TAG_VERSION_STR, struct omap_version_config) == NULL)
+		return -ENODEV;
+	if (!create_proc_read_entry("component_version", S_IRUGO, NULL,
+				    component_version_read_proc, NULL))
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void __exit component_version_exit(void)
+{
+	remove_proc_entry("component_version", NULL);
+}
+
+late_initcall(component_version_init);
+module_exit(component_version_exit);
+
+MODULE_AUTHOR("Juha Yrjölä <juha.yrjola@nokia.com>");
+MODULE_DESCRIPTION("Component version driver");
+MODULE_LICENSE("GPL");
Index: linux-3.1/arch/arm/plat-omap/Kconfig
===================================================================
--- linux-3.1.orig/arch/arm/plat-omap/Kconfig	2011-10-30 00:48:32.933054543 +0200
+++ linux-3.1/arch/arm/plat-omap/Kconfig	2011-10-30 00:48:34.877053219 +0200
@@ -82,6 +82,38 @@ config OMAP_RESET_CLOCKS
 	  probably do not want this option enabled until your
 	  device drivers work properly.
 
+config OMAP_BOOT_TAG
+	bool "OMAP bootloader information passing"
+        depends on ARCH_OMAP
+        default n
+        help
+          Say Y, if you have a bootloader which passes information
+          about your board and its peripheral configuration.
+
+config OMAP_BOOT_REASON
+	bool "Support for boot reason"
+        depends on OMAP_BOOT_TAG
+        default n
+        help
+          Say Y, if you want to have a procfs entry for reading the boot
+          reason in user-space.
+
+config OMAP_COMPONENT_VERSION
+	bool "Support for component version display"
+	depends on OMAP_BOOT_TAG && PROC_FS
+	default n
+	help
+	  Say Y, if you want to have a procfs entry for reading component
+	  versions (supplied by the bootloader) in user-space.
+
+config OMAP_GPIO_SWITCH
+	bool "GPIO switch support"
+	help
+	  Say Y, if you want to have support for reporting of GPIO
+	  switches (e.g. cover switches) via sysfs. Your bootloader has
+	  to provide information about the switches to the kernel via the
+	  ATAG_BOARD mechanism if they're not defined by the board config.
+
 config OMAP_MUX
 	bool "OMAP multiplexing support"
 	depends on ARCH_OMAP
Index: linux-3.1/arch/arm/plat-omap/Makefile
===================================================================
--- linux-3.1.orig/arch/arm/plat-omap/Makefile	2011-10-30 00:48:32.953054530 +0200
+++ linux-3.1/arch/arm/plat-omap/Makefile	2011-10-30 00:48:34.877053219 +0200
@@ -23,6 +23,9 @@ obj-$(CONFIG_OMAP_IOMMU_DEBUG) += iommu-
 
 obj-$(CONFIG_CPU_FREQ) += cpu-omap.o
 obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o
+obj-$(CONFIG_OMAP_BOOT_REASON) += bootreason.o
+obj-$(CONFIG_OMAP_COMPONENT_VERSION) += component-version.o
+obj-$(CONFIG_OMAP_GPIO_SWITCH) += gpio-switch.o
 obj-$(CONFIG_OMAP_DEBUG_DEVICES) += debug-devices.o
 obj-$(CONFIG_OMAP_DEBUG_LEDS) += debug-leds.o
 i2c-omap-$(CONFIG_I2C_OMAP) := i2c.o
Index: linux-3.1/arch/arm/include/asm/setup.h
===================================================================
--- linux-3.1.orig/arch/arm/include/asm/setup.h	2011-10-30 00:48:32.965054522 +0200
+++ linux-3.1/arch/arm/include/asm/setup.h	2011-10-30 00:48:34.877053219 +0200
@@ -136,6 +136,13 @@ struct tag_acorn {
 	__u8 adfsdrives;
 };
 
+/* TI OMAP specific information */
+#define ATAG_BOARD       0x414f4d50
+
+struct tag_omap {
+	u8 data[0];
+};
+
 /* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
 #define ATAG_MEMCLK	0x41000402
 
@@ -162,6 +169,11 @@ struct tag {
 		struct tag_acorn	acorn;
 
 		/*
+		 * OMAP specific
+                 */
+                struct tag_omap         omap;
+
+		/*
 		 * DC21285 specific
 		 */
 		struct tag_memclk	memclk;
Index: linux-3.1/arch/arm/plat-omap/gpio-switch.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-3.1/arch/arm/plat-omap/gpio-switch.c	2011-10-30 00:48:34.877053219 +0200
@@ -0,0 +1,554 @@
+/*
+ *  linux/arch/arm/plat-omap/gpio-switch.c
+ *
+ *  Copyright (C) 2004-2006 Nokia Corporation
+ *  Written by Juha Yrjölä <juha.yrjola@nokia.com>
+ *         and Paul Mundt <paul.mundt@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/timer.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <plat/hardware.h>
+#include <plat/irqs.h>
+#include <plat/mux.h>
+#include <plat/board.h>
+#include <plat/gpio-switch.h>
+
+struct gpio_switch {
+	char		name[14];
+	u16		gpio;
+	unsigned	flags:4;
+	unsigned	type:4;
+	unsigned	state:1;
+	unsigned	both_edges:1;
+
+	u16		debounce_rising;
+	u16		debounce_falling;
+
+	void (* notify)(void *data, int state);
+	void *notify_data;
+
+	struct work_struct	work;
+	struct timer_list	timer;
+	struct platform_device	pdev;
+
+	struct list_head	node;
+};
+
+static LIST_HEAD(gpio_switches);
+static struct platform_device *gpio_sw_platform_dev;
+static struct platform_driver gpio_sw_driver;
+
+static const struct omap_gpio_switch *board_gpio_sw_table;
+static int board_gpio_sw_count;
+
+static const char *cover_str[2] = { "open", "closed" };
+static const char *connection_str[2] = { "disconnected", "connected" };
+static const char *activity_str[2] = { "inactive", "active" };
+
+/*
+ * GPIO switch state default debounce delay in ms
+ */
+#define OMAP_GPIO_SW_DEFAULT_DEBOUNCE		10
+
+static const char **get_sw_str(struct gpio_switch *sw)
+{
+	switch (sw->type) {
+	case OMAP_GPIO_SWITCH_TYPE_COVER:
+		return cover_str;
+	case OMAP_GPIO_SWITCH_TYPE_CONNECTION:
+		return connection_str;
+	case OMAP_GPIO_SWITCH_TYPE_ACTIVITY:
+		return activity_str;
+	default:
+		BUG();
+		return NULL;
+	}
+}
+
+static const char *get_sw_type(struct gpio_switch *sw)
+{
+	switch (sw->type) {
+	case OMAP_GPIO_SWITCH_TYPE_COVER:
+		return "cover";
+	case OMAP_GPIO_SWITCH_TYPE_CONNECTION:
+		return "connection";
+	case OMAP_GPIO_SWITCH_TYPE_ACTIVITY:
+		return "activity";
+	default:
+		BUG();
+		return NULL;
+	}
+}
+
+static void print_sw_state(struct gpio_switch *sw, int state)
+{
+	const char **str;
+
+	str = get_sw_str(sw);
+	if (str != NULL)
+		printk(KERN_INFO "%s (GPIO %d) is now %s\n", sw->name, sw->gpio, str[state]);
+}
+
+static int gpio_sw_get_state(struct gpio_switch *sw)
+{
+	int state;
+
+	state = gpio_get_value(sw->gpio);
+	if (sw->flags & OMAP_GPIO_SWITCH_FLAG_INVERTED)
+		state = !state;
+
+	return state;
+}
+
+static ssize_t gpio_sw_state_store(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf,
+				   size_t count)
+{
+	struct gpio_switch *sw = dev_get_drvdata(dev);
+	const char **str;
+	char state[16];
+	int enable;
+
+	if (!(sw->flags & OMAP_GPIO_SWITCH_FLAG_OUTPUT))
+		return -EPERM;
+
+	if (sscanf(buf, "%15s", state) != 1)
+		return -EINVAL;
+
+	str = get_sw_str(sw);
+	if (strcmp(state, str[0]) == 0)
+		sw->state = enable = 0;
+	else if (strcmp(state, str[1]) == 0)
+		sw->state = enable = 1;
+	else
+		return -EINVAL;
+
+	if (sw->flags & OMAP_GPIO_SWITCH_FLAG_INVERTED)
+		enable = !enable;
+	gpio_set_value(sw->gpio, enable);
+
+	return count;
+}
+
+static ssize_t gpio_sw_state_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	struct gpio_switch *sw = dev_get_drvdata(dev);
+	const char **str;
+
+	str = get_sw_str(sw);
+	return sprintf(buf, "%s\n", str[sw->state]);
+}
+
+static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, gpio_sw_state_show,
+		   gpio_sw_state_store);
+
+static ssize_t gpio_sw_type_show(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
+{
+	struct gpio_switch *sw = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", get_sw_type(sw));
+}
+
+static DEVICE_ATTR(type, S_IRUGO, gpio_sw_type_show, NULL);
+
+static ssize_t gpio_sw_direction_show(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf)
+{
+	struct gpio_switch *sw = dev_get_drvdata(dev);
+	int is_output;
+
+	is_output = sw->flags & OMAP_GPIO_SWITCH_FLAG_OUTPUT;
+	return sprintf(buf, "%s\n", is_output ? "output" : "input");
+}
+
+static DEVICE_ATTR(direction, S_IRUGO, gpio_sw_direction_show, NULL);
+
+
+static irqreturn_t gpio_sw_irq_handler(int irq, void *arg)
+{
+	struct gpio_switch *sw = arg;
+	unsigned long timeout;
+	int state;
+
+	if (!sw->both_edges) {
+		if (gpio_get_value(sw->gpio))
+			irq_set_irq_type(OMAP_GPIO_IRQ(sw->gpio), IRQ_TYPE_EDGE_FALLING);
+		else
+			irq_set_irq_type(OMAP_GPIO_IRQ(sw->gpio), IRQ_TYPE_EDGE_RISING);
+	}
+
+	state = gpio_sw_get_state(sw);
+	if (sw->state == state)
+		return IRQ_HANDLED;
+
+	if (state)
+		timeout = sw->debounce_rising;
+	else
+		timeout = sw->debounce_falling;
+	if (!timeout)
+		schedule_work(&sw->work);
+	else
+		mod_timer(&sw->timer, jiffies + msecs_to_jiffies(timeout));
+
+	return IRQ_HANDLED;
+}
+
+static void gpio_sw_timer(unsigned long arg)
+{
+	struct gpio_switch *sw = (struct gpio_switch *) arg;
+
+	schedule_work(&sw->work);
+}
+
+static void gpio_sw_handler(struct work_struct *work)
+{
+	struct gpio_switch *sw = container_of(work, struct gpio_switch, work);
+	int state;
+
+	state = gpio_sw_get_state(sw);
+	if (sw->state == state)
+		return;
+
+	sw->state = state;
+	if (sw->notify != NULL)
+		sw->notify(sw->notify_data, state);
+	sysfs_notify(&sw->pdev.dev.kobj, NULL, "state");
+	print_sw_state(sw, state);
+}
+
+static int __init can_do_both_edges(struct gpio_switch *sw)
+{
+	if (!cpu_class_is_omap1())
+		return 1;
+	if (OMAP_GPIO_IS_MPUIO(sw->gpio))
+		return 0;
+	else
+		return 1;
+}
+
+static void gpio_sw_release(struct device *dev)
+{
+}
+
+static int __init new_switch(struct gpio_switch *sw)
+{
+	int r, direction, trigger;
+
+	switch (sw->type) {
+	case OMAP_GPIO_SWITCH_TYPE_COVER:
+	case OMAP_GPIO_SWITCH_TYPE_CONNECTION:
+	case OMAP_GPIO_SWITCH_TYPE_ACTIVITY:
+		break;
+	default:
+		printk(KERN_ERR "invalid GPIO switch type: %d\n", sw->type);
+		return -EINVAL;
+	}
+
+	sw->pdev.name	= sw->name;
+	sw->pdev.id	= -1;
+
+	sw->pdev.dev.parent = &gpio_sw_platform_dev->dev;
+	sw->pdev.dev.driver = &gpio_sw_driver.driver;
+	sw->pdev.dev.release = gpio_sw_release;
+
+	r = platform_device_register(&sw->pdev);
+	if (r) {
+		printk(KERN_ERR "gpio-switch: platform device registration "
+		       "failed for %s", sw->name);
+		return r;
+	}
+	dev_set_drvdata(&sw->pdev.dev, sw);
+
+	r = gpio_request(sw->gpio, "gpio-switch");
+	if (r < 0) {
+		platform_device_unregister(&sw->pdev);
+		return r;
+	}
+
+	/* input: 1, output: 0 */
+	direction = !(sw->flags & OMAP_GPIO_SWITCH_FLAG_OUTPUT);
+	if (direction)
+		gpio_direction_input(sw->gpio);
+	else
+		gpio_direction_output(sw->gpio, 0);
+
+	sw->state = gpio_sw_get_state(sw);
+
+	r = 0;
+	r |= device_create_file(&sw->pdev.dev, &dev_attr_state);
+	r |= device_create_file(&sw->pdev.dev, &dev_attr_type);
+	r |= device_create_file(&sw->pdev.dev, &dev_attr_direction);
+	if (r)
+		printk(KERN_ERR "gpio-switch: attribute file creation "
+		       "failed for %s\n", sw->name);
+
+	if (!direction)
+		return 0;
+
+	if (can_do_both_edges(sw)) {
+		trigger = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
+		sw->both_edges = 1;
+	} else {
+		if (gpio_get_value(sw->gpio))
+			trigger = IRQF_TRIGGER_FALLING;
+		else
+			trigger = IRQF_TRIGGER_RISING;
+	}
+	r = request_irq(OMAP_GPIO_IRQ(sw->gpio), gpio_sw_irq_handler,
+			IRQF_SHARED | trigger, sw->name, sw);
+	if (r < 0) {
+		printk(KERN_ERR "gpio-switch: request_irq() failed "
+		       "for GPIO %d\n", sw->gpio);
+		platform_device_unregister(&sw->pdev);
+		gpio_free(sw->gpio);
+		return r;
+	}
+
+	INIT_WORK(&sw->work, gpio_sw_handler);
+	init_timer(&sw->timer);
+
+	sw->timer.function = gpio_sw_timer;
+	sw->timer.data = (unsigned long)sw;
+
+	list_add(&sw->node, &gpio_switches);
+
+	return 0;
+}
+
+static int __init add_atag_switches(void)
+{
+	const struct omap_gpio_switch_config *cfg;
+	struct gpio_switch *sw;
+	int i, r;
+
+	for (i = 0; ; i++) {
+		cfg = omap_get_nr_config(OMAP_TAG_GPIO_SWITCH,
+					 struct omap_gpio_switch_config, i);
+		if (cfg == NULL)
+			break;
+		sw = kzalloc(sizeof(*sw), GFP_KERNEL);
+		if (sw == NULL) {
+			printk(KERN_ERR "gpio-switch: kmalloc failed\n");
+			return -ENOMEM;
+		}
+		strncpy(sw->name, cfg->name, sizeof(cfg->name));
+		sw->gpio = cfg->gpio;
+		sw->flags = cfg->flags;
+		sw->type = cfg->type;
+		sw->debounce_rising = OMAP_GPIO_SW_DEFAULT_DEBOUNCE;
+		sw->debounce_falling = OMAP_GPIO_SW_DEFAULT_DEBOUNCE;
+		if ((r = new_switch(sw)) < 0) {
+			kfree(sw);
+			return r;
+		}
+	}
+	return 0;
+}
+
+static struct gpio_switch * __init find_switch(int gpio, const char *name)
+{
+	struct gpio_switch *sw;
+
+	list_for_each_entry(sw, &gpio_switches, node) {
+		if ((gpio < 0 || sw->gpio != gpio) &&
+		    (name == NULL || strcmp(sw->name, name) != 0))
+			continue;
+
+		if (gpio < 0 || name == NULL)
+			goto no_check;
+
+		if (strcmp(sw->name, name) != 0)
+			printk("gpio-switch: name mismatch for %d (%s, %s)\n",
+			       gpio, name, sw->name);
+		else if (sw->gpio != gpio)
+			printk("gpio-switch: GPIO mismatch for %s (%d, %d)\n",
+			       name, gpio, sw->gpio);
+no_check:
+		return sw;
+	}
+	return NULL;
+}
+
+static int __init add_board_switches(void)
+{
+	int i;
+
+	for (i = 0; i < board_gpio_sw_count; i++) {
+		const struct omap_gpio_switch *cfg;
+		struct gpio_switch *sw;
+		int r;
+
+		cfg = board_gpio_sw_table + i;
+		if (strlen(cfg->name) > sizeof(sw->name) - 1)
+			return -EINVAL;
+		/* Check whether we only update an existing switch
+		 * or add a new switch. */
+		sw = find_switch(cfg->gpio, cfg->name);
+		if (sw != NULL) {
+			sw->debounce_rising = cfg->debounce_rising;
+			sw->debounce_falling = cfg->debounce_falling;
+			sw->notify = cfg->notify;
+			sw->notify_data = cfg->notify_data;
+			continue;
+		} else {
+			if (cfg->gpio < 0 || cfg->name == NULL) {
+				printk("gpio-switch: required switch not "
+				       "found (%d, %s)\n", cfg->gpio,
+				       cfg->name);
+				continue;
+			}
+		}
+		sw = kzalloc(sizeof(*sw), GFP_KERNEL);
+		if (sw == NULL) {
+			printk(KERN_ERR "gpio-switch: kmalloc failed\n");
+			return -ENOMEM;
+		}
+		strlcpy(sw->name, cfg->name, sizeof(sw->name));
+		sw->gpio = cfg->gpio;
+		sw->flags = cfg->flags;
+		sw->type = cfg->type;
+		sw->debounce_rising = cfg->debounce_rising;
+		sw->debounce_falling = cfg->debounce_falling;
+		sw->notify = cfg->notify;
+		sw->notify_data = cfg->notify_data;
+		if ((r = new_switch(sw)) < 0) {
+			kfree(sw);
+			return r;
+		}
+	}
+	return 0;
+}
+
+static void gpio_sw_cleanup(void)
+{
+	struct gpio_switch *sw = NULL, *old = NULL;
+
+	list_for_each_entry(sw, &gpio_switches, node) {
+		if (old != NULL)
+			kfree(old);
+		flush_scheduled_work();
+		del_timer_sync(&sw->timer);
+
+		free_irq(OMAP_GPIO_IRQ(sw->gpio), sw);
+
+		device_remove_file(&sw->pdev.dev, &dev_attr_state);
+		device_remove_file(&sw->pdev.dev, &dev_attr_type);
+		device_remove_file(&sw->pdev.dev, &dev_attr_direction);
+
+		platform_device_unregister(&sw->pdev);
+		gpio_free(sw->gpio);
+		old = sw;
+	}
+	kfree(old);
+}
+
+static void __init report_initial_state(void)
+{
+	struct gpio_switch *sw;
+
+	list_for_each_entry(sw, &gpio_switches, node) {
+		int state;
+
+		state = gpio_get_value(sw->gpio);
+		if (sw->flags & OMAP_GPIO_SWITCH_FLAG_INVERTED)
+			state = !state;
+		if (sw->notify != NULL)
+			sw->notify(sw->notify_data, state);
+		print_sw_state(sw, state);
+	}
+}
+
+static int gpio_sw_remove(struct platform_device *dev)
+{
+	return 0;
+}
+
+static struct platform_driver gpio_sw_driver = {
+	.remove		= gpio_sw_remove,
+	.driver		= {
+		.name	= "gpio-switch",
+	},
+};
+
+void __init omap_register_gpio_switches(const struct omap_gpio_switch *tbl,
+					int count)
+{
+	BUG_ON(board_gpio_sw_table != NULL);
+
+	board_gpio_sw_table = tbl;
+	board_gpio_sw_count = count;
+}
+
+static int __init gpio_sw_init(void)
+{
+	int r;
+
+	printk(KERN_INFO "OMAP GPIO switch handler initializing\n");
+
+	r = platform_driver_register(&gpio_sw_driver);
+	if (r)
+		return r;
+
+	gpio_sw_platform_dev = platform_device_register_simple("gpio-switch",
+							       -1, NULL, 0);
+	if (IS_ERR(gpio_sw_platform_dev)) {
+		r = PTR_ERR(gpio_sw_platform_dev);
+		goto err1;
+	}
+
+	r = add_atag_switches();
+	if (r < 0)
+		goto err2;
+
+	r = add_board_switches();
+	if (r < 0)
+		goto err2;
+
+	report_initial_state();
+
+	return 0;
+err2:
+	gpio_sw_cleanup();
+	platform_device_unregister(gpio_sw_platform_dev);
+err1:
+	platform_driver_unregister(&gpio_sw_driver);
+	return r;
+}
+
+static void __exit gpio_sw_exit(void)
+{
+	gpio_sw_cleanup();
+	platform_device_unregister(gpio_sw_platform_dev);
+	platform_driver_unregister(&gpio_sw_driver);
+}
+
+#ifndef MODULE
+late_initcall(gpio_sw_init);
+#else
+module_init(gpio_sw_init);
+#endif
+module_exit(gpio_sw_exit);
+
+MODULE_AUTHOR("Juha Yrjölä <juha.yrjola@nokia.com>, Paul Mundt <paul.mundt@nokia.com");
+MODULE_DESCRIPTION("GPIO switch driver");
+MODULE_LICENSE("GPL");
Index: linux-3.1/arch/arm/plat-omap/include/plat/board.h
===================================================================
--- linux-3.1.orig/arch/arm/plat-omap/include/plat/board.h	2011-10-30 00:48:32.949054532 +0200
+++ linux-3.1/arch/arm/plat-omap/include/plat/board.h	2011-10-30 00:48:34.877053219 +0200
@@ -151,6 +151,14 @@ struct omap_board_config_kernel {
 	const void *data;
 };
 
+struct omap_gpio_switch_config {
+	char name[12];
+	u16 gpio;
+	int flags:4;
+	int type:4;
+	int key_code:24; /* Linux key code */
+};
+
 extern const void *__init __omap_get_config(u16 tag, size_t len, int nr);
 
 #define omap_get_config(tag, type) \