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/*
* Linux Broadcom BCM47xx GPIO char driver
*
* Copyright 2007, Broadcom Corporation
* All Rights Reserved.
*
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
* $Id: linux_gpio.c,v 1.1.1.1 2008/07/21 09:20:53 james26_jang Exp $
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <asm/uaccess.h>
#include <typedefs.h>
#include <bcmutils.h>
#include <sbutils.h>
#include <bcmdevs.h>
#include <linux_gpio.h>
/* handle to the sb */
static sb_t *gpio_sbh;
/* major number assigned to the device and device handles */
static int gpio_major;
devfs_handle_t gpiodev_handle;
static int
gpio_open(struct inode *inode, struct file * file)
{
MOD_INC_USE_COUNT;
return 0;
}
static int
gpio_release(struct inode *inode, struct file * file)
{
MOD_DEC_USE_COUNT;
return 0;
}
static int
gpio_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
struct gpio_ioctl gpioioc;
if (copy_from_user(&gpioioc, (struct gpio_ioctl *)arg, sizeof(struct gpio_ioctl)))
return -EFAULT;
switch (cmd) {
case GPIO_IOC_RESERVE:
gpioioc.val = sb_gpioreserve(gpio_sbh, gpioioc.mask, GPIO_APP_PRIORITY);
break;
case GPIO_IOC_RELEASE:
/*
* releasing the gpio doesn't change the current
* value on the GPIO last write value
* persists till some one overwrites it
*/
gpioioc.val = sb_gpiorelease(gpio_sbh, gpioioc.mask, GPIO_APP_PRIORITY);
break;
case GPIO_IOC_OUT:
gpioioc.val = sb_gpioout(gpio_sbh, gpioioc.mask, gpioioc.val,
GPIO_APP_PRIORITY);
break;
case GPIO_IOC_OUTEN:
gpioioc.val = sb_gpioouten(gpio_sbh, gpioioc.mask, gpioioc.val,
GPIO_APP_PRIORITY);
break;
case GPIO_IOC_IN:
gpioioc.val = sb_gpioin(gpio_sbh);
break;
default:
break;
}
if (copy_to_user((struct gpio_ioctl *)arg, &gpioioc, sizeof(struct gpio_ioctl)))
return -EFAULT;
return 0;
}
static struct file_operations gpio_fops = {
owner: THIS_MODULE,
open: gpio_open,
release: gpio_release,
ioctl: gpio_ioctl,
};
static int __init
gpio_init(void)
{
if (!(gpio_sbh = sb_kattach(SB_OSH)))
return -ENODEV;
if ((gpio_major = devfs_register_chrdev(0, "gpio", &gpio_fops)) < 0)
return gpio_major;
gpiodev_handle = devfs_register(NULL, "gpio", DEVFS_FL_DEFAULT,
gpio_major, 0, S_IFCHR | S_IRUGO | S_IWUGO,
&gpio_fops, NULL);
return 0;
}
static void __exit
gpio_exit(void)
{
if (gpiodev_handle != NULL)
devfs_unregister(gpiodev_handle);
gpiodev_handle = NULL;
devfs_unregister_chrdev(gpio_major, "gpio");
sb_detach(gpio_sbh);
}
module_init(gpio_init);
module_exit(gpio_exit);
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