2 * arch/sh/boards/landisk/gio.c - driver for landisk
4 * This driver will also support the I-O DATA Device, Inc. LANDISK Board.
5 * LANDISK and USL-5P Button, LED and GIO driver drive function.
7 * Copylight (C) 2006 kogiidena
8 * Copylight (C) 2002 Atom Create Engineering Co., Ltd. *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main directory of this archive
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/kdev_t.h>
18 #include <linux/cdev.h>
21 #include <asm/uaccess.h>
22 #include <asm/landisk/gio.h>
23 #include <asm/landisk/iodata_landisk.h>
26 #define GIO_MINOR 2 /* GIO minor no. */
29 static struct cdev *cdev_p;
32 static int gio_open(struct inode *inode, struct file *filp)
36 minor = MINOR(inode->i_rdev);
37 if (minor < DEVCOUNT) {
48 static int gio_close(struct inode *inode, struct file *filp)
52 minor = MINOR(inode->i_rdev);
53 if (minor < DEVCOUNT) {
59 static int gio_ioctl(struct inode *inode, struct file *filp,
60 unsigned int cmd, unsigned long arg)
63 static unsigned int addr = 0;
65 if (cmd & 0x01) { /* write */
66 if (copy_from_user(&data, (int *)arg, sizeof(int))) {
72 case GIODRV_IOCSGIOSETADDR: /* address set */
76 case GIODRV_IOCSGIODATA1: /* write byte */
77 ctrl_outb((unsigned char)(0x0ff & data), addr);
80 case GIODRV_IOCSGIODATA2: /* write word */
84 ctrl_outw((unsigned short int)(0x0ffff & data), addr);
87 case GIODRV_IOCSGIODATA4: /* write long */
91 ctrl_outl(data, addr);
94 case GIODRV_IOCGGIODATA1: /* read byte */
95 data = ctrl_inb(addr);
98 case GIODRV_IOCGGIODATA2: /* read word */
102 data = ctrl_inw(addr);
105 case GIODRV_IOCGGIODATA4: /* read long */
109 data = ctrl_inl(addr);
116 if ((cmd & 0x01) == 0) { /* read */
117 if (copy_to_user((int *)arg, &data, sizeof(int))) {
124 static struct file_operations gio_fops = {
125 .owner = THIS_MODULE,
126 .open = gio_open, /* open */
127 .release = gio_close, /* release */
128 .ioctl = gio_ioctl, /* ioctl */
131 static int __init gio_init(void)
135 printk(KERN_INFO "gio: driver initialized\n");
139 if ((error = alloc_chrdev_region(&dev, 0, DEVCOUNT, "gio")) < 0) {
141 "gio: Couldn't alloc_chrdev_region, error=%d\n",
146 cdev_p = cdev_alloc();
147 cdev_p->ops = &gio_fops;
148 error = cdev_add(cdev_p, dev, DEVCOUNT);
151 "gio: Couldn't cdev_add, error=%d\n", error);
158 static void __exit gio_exit(void)
161 unregister_chrdev_region(dev, DEVCOUNT);
164 module_init(gio_init);
165 module_exit(gio_exit);
167 MODULE_LICENSE("GPL");