path: root/target/linux/at91-2.6/patches/003-gpio-driver.patch

--- linux-2.6.21.1.orig/arch/arm/mach-at91/gpio.c	2007-04-27 23:49:26.000000000 +0200
+++ linux-2.6.21.1/arch/arm/mach-at91/gpio.c	2007-05-28 15:30:48.000000000 +0200
@@ -27,6 +27,7 @@
 
 static struct at91_gpio_bank *gpio;
 static int gpio_banks;
+static u32 pio_gpio_pin[4] = { 0, 0, 0, 0 };
 
 
 static inline void __iomem *pin_to_controller(unsigned pin)
@@ -71,9 +72,13 @@
 {
 	void __iomem	*pio = pin_to_controller(pin);
 	unsigned	mask = pin_to_mask(pin);
+	int bank = (pin - PIN_BASE) / 32;
 
 	if (!pio)
 		return -EINVAL;
+
+	pio_gpio_pin[bank] |= mask;
+
 	__raw_writel(mask, pio + PIO_IDR);
 	__raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
 	__raw_writel(mask, pio + PIO_PER);
@@ -130,10 +135,13 @@
 {
 	void __iomem	*pio = pin_to_controller(pin);
 	unsigned	mask = pin_to_mask(pin);
+	int bank = (pin - PIN_BASE) / 32;
 
 	if (!pio)
 		return -EINVAL;
 
+	pio_gpio_pin[bank] |= mask;
+
 	__raw_writel(mask, pio + PIO_IDR);
 	__raw_writel(mask, pio + (use_pullup ? PIO_PUER : PIO_PUDR));
 	__raw_writel(mask, pio + PIO_ODR);
@@ -151,10 +159,13 @@
 {
 	void __iomem	*pio = pin_to_controller(pin);
 	unsigned	mask = pin_to_mask(pin);
+	int bank = (pin - PIN_BASE) / 32;
 
 	if (!pio)
 		return -EINVAL;
 
+	pio_gpio_pin[bank] |= mask;
+
 	__raw_writel(mask, pio + PIO_IDR);
 	__raw_writel(mask, pio + PIO_PUDR);
 	__raw_writel(mask, pio + (value ? PIO_SODR : PIO_CODR));
@@ -262,6 +273,18 @@
 }
 EXPORT_SYMBOL(at91_get_gpio_value);
 
+int at91_is_pin_gpio(unsigned pin)
+{
+  void __iomem  *pio = pin_to_controller(pin);
+  unsigned  mask = pin_to_mask(pin);
+  int     bank = (pin - PIN_BASE) / 32;
+
+  if (!pio)
+    return -EINVAL;
+  return (pio_gpio_pin[bank] & mask) != 0;
+}
+EXPORT_SYMBOL(at91_is_pin_gpio);
+
 /*--------------------------------------------------------------------------*/
 
 #ifdef CONFIG_PM
--- linux-2.6.21.1.orig/drivers/char/Kconfig	2007-05-28 12:22:29.000000000 +0200
+++ linux-2.6.21.1/drivers/char/Kconfig	2007-05-28 15:37:43.000000000 +0200
@@ -1087,5 +1087,12 @@
 	  The SPI driver gives user mode access to this serial
 	  bus on the AT91RM9200 processor.
 
+config AT91_VLIO
+  tristate "Versalink LED and GPIO interface"
+  depends on ARCH_AT91RM9200 && MACH_VLINK
+  default n
+  help
+    Provides a handler GPIO's in userspace
+
 endmenu
 
--- linux-2.6.21.1.orig/drivers/char/Makefile	2007-05-28 12:22:29.000000000 +0200
+++ linux-2.6.21.1/drivers/char/Makefile	2007-05-28 15:38:11.000000000 +0200
@@ -95,6 +95,7 @@
 obj-$(CONFIG_TELCLOCK)		+= tlclk.o
 obj-$(CONFIG_AT91_SPI)		+= at91_spi.o
 obj-$(CONFIG_AT91_SPIDEV)	+= at91_spidev.o
+obj-$(CONFIG_AT91_VLIO)  += vlink_giu.o
 
 obj-$(CONFIG_WATCHDOG)		+= watchdog/
 obj-$(CONFIG_MWAVE)		+= mwave/
--- linux-2.6.21.1.orig/drivers/char/vlink_giu.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.21.1/drivers/char/vlink_giu.c	2007-05-28 15:39:47.000000000 +0200
@@ -0,0 +1,256 @@
+/*
+ *  Driver for FDL Versalink GPIO
+ *
+ *  Copyright (C) 2005 Guthrie Consulting
+ *	Author: Hamish Guthrie <hamish@prodigi.ch>
+ *
+ *  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 program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <linux/fcntl.h>
+#include <linux/seq_file.h>
+#include <linux/cdev.h>
+#include <asm/arch/gpio.h>
+#include <asm/uaccess.h>
+
+static int major;	/* default is dynamic major device number */
+module_param(major, int, 0);
+MODULE_PARM_DESC(major, "Major device number");
+
+#define VIO_NR_DEVS 96
+
+struct vio_dev {
+	struct cdev cdev;
+};
+
+struct vio_dev *vio_devices;
+static struct class *vio_class;
+
+static ssize_t gpio_read(struct file *file, char __user *buf, size_t len,
+                         loff_t *ppos)
+{
+	unsigned int pin;
+	int retval;
+	char value = '0';
+
+	pin = iminor(file->f_dentry->d_inode);
+
+	retval = at91_get_gpio_value(PIN_BASE + pin);
+	if (retval < 0)
+		return -EFAULT;
+
+	value = retval + 0x30;
+	if (put_user(value, buf))
+		return -EFAULT;
+
+	return 1;
+}
+
+static ssize_t gpio_write(struct file *file, const char __user *data,
+                          size_t len, loff_t *ppos)
+{
+	unsigned int pin;
+	size_t i;
+	char c;
+	int retval = 0;
+
+	pin = iminor(file->f_dentry->d_inode);
+
+	for (i = 0; i < len; i++) {
+		if (get_user(c, data + i))
+			return -EFAULT;
+
+		switch (c) {
+		case '0':
+		case '1':
+			retval = at91_set_gpio_value(PIN_BASE + pin, (int)c - 0x30);
+			if (retval < 0)
+				return -EFAULT;
+			break;
+		default:
+			break;
+		}
+
+		if (retval < 0)
+			break;
+	}
+
+	return i;
+}
+
+static int gpio_open(struct inode *inode, struct file *file)
+{
+	return nonseekable_open(inode, file);
+}
+
+static int gpio_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static struct file_operations vio_fops = {
+	.owner		= THIS_MODULE,
+	.read		= gpio_read,
+	.write		= gpio_write,
+	.open		= gpio_open,
+	.release	= gpio_release,
+};
+
+static void vio_setup_cdev(struct vio_dev *dev, int index)
+{
+	int err, devno = MKDEV(major, index);
+
+	cdev_init(&dev->cdev, &vio_fops);
+	dev->cdev.owner = THIS_MODULE;
+	dev->cdev.ops = &vio_fops;
+	err = cdev_add (&dev->cdev, devno, 1);
+	if (err)
+		printk(KERN_NOTICE "vio: Error %d adding vio%d", err, index);
+}
+
+static int vio_remove(struct platform_device *dev)
+{
+	int i;
+	dev_t devno = MKDEV(major, 0);
+
+	if (vio_devices) {
+		for(i=0; i<VIO_NR_DEVS; i++) {
+			int iodev = at91_is_pin_gpio(PIN_BASE + i);
+			if (iodev) {
+				cdev_del(&vio_devices[i].cdev);
+				class_device_destroy(vio_class, MKDEV(major, i));
+			}
+		}
+		kfree(vio_devices);
+	}
+
+	class_destroy(vio_class);
+	unregister_chrdev_region(devno, VIO_NR_DEVS);
+
+	platform_set_drvdata(dev, NULL);
+
+	return 0;
+}
+
+static int vio_probe(struct platform_device *dev)
+{
+	int retval, i, j;
+	dev_t vdev = 0;
+
+	if (major) {
+		vdev = MKDEV(major, 0);
+		retval = register_chrdev_region(vdev, VIO_NR_DEVS, "vio");
+	} else {
+		retval = alloc_chrdev_region(&vdev, 0, VIO_NR_DEVS, "vio");
+		major = MAJOR(vdev);
+	}
+	if (retval < 0) {
+		printk(KERN_WARNING "vio: can't get major %d\n", major);
+		return retval;
+	}
+
+	if (major == 0) {
+		major = retval;
+		printk(KERN_INFO "vio: major number %d\n", major);
+	}
+
+	vio_class = class_create(THIS_MODULE, "vio");
+
+	if (IS_ERR(vio_class)) {
+		printk(KERN_ERR "vio: Error creating vio class\n");
+		vio_remove(dev);
+		return PTR_ERR(vio_class);
+	}
+
+	vio_devices = kmalloc(VIO_NR_DEVS * sizeof(struct vio_dev), GFP_KERNEL);
+	if (!vio_devices) {
+		retval = -ENOMEM;
+		goto fail;
+	}
+	memset(vio_devices, 0, VIO_NR_DEVS * sizeof(struct vio_dev));
+
+	for (i=0; i<VIO_NR_DEVS/32; i++)
+		for(j=0; j<32; j++) {
+			int iodev = at91_is_pin_gpio(PIN_BASE + i*32 + j);
+			if (iodev) {
+				vio_setup_cdev(&vio_devices[i*32 + j], i*32 + j);
+				class_device_create(vio_class, NULL, MKDEV(major, i*32 + j), NULL,
+					"vio%c%d", i + 'A', j);
+			}
+		}
+
+	platform_set_drvdata(dev, vio_devices);
+
+	return 0;
+
+fail:
+	vio_remove(dev);
+	return retval;
+}
+
+static struct platform_device *vio_platform_device;
+
+static struct platform_driver vio_driver = {
+	.probe 		= vio_probe,
+	.remove		= vio_remove,
+	.driver		= {
+		.name	= "vio",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init vio_init(void)
+{
+	int retval;
+
+	vio_platform_device = platform_device_register_simple("vio", -1, NULL, 0);
+	if (IS_ERR(vio_platform_device)) {
+		printk(KERN_WARNING "vio: device registration failed\n");
+		return PTR_ERR(vio_platform_device);
+	}
+
+	retval = platform_driver_register(&vio_driver);
+	if (retval < 0) {
+		printk(KERN_WARNING "vio: driver registration failed\n");
+		platform_device_unregister(vio_platform_device);
+	}
+	
+	return retval;
+}
+
+static void __exit vio_exit(void)
+{
+	platform_driver_unregister(&vio_driver);
+	platform_device_unregister(vio_platform_device);
+}
+
+module_init(vio_init);
+module_exit(vio_exit);
+
+MODULE_AUTHOR("Hamish Guthrie <hamish@prodigi.ch>");
+MODULE_DESCRIPTION("FDL Versalink GPIO Driver");
+MODULE_LICENSE("GPL");