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openwrt-xburst/target/linux/at91-2.6/patches/003-gpio-driver.patch
hcg 455638113d userspace gpio driver for .21 
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7368 3c298f89-4303-0410-b956-a3cf2f4a3e73
2007-05-28 13:47:22 +00:00

356 lines
8.7 KiB
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--- 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");
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