1 // SPDX-License-Identifier: GPL-2.0
3 * arch/sh/boards/landisk/gio.c - driver for landisk
5 * This driver will also support the I-O DATA Device, Inc. LANDISK Board.
6 * LANDISK and USL-5P Button, LED and GIO driver drive function.
8 * Copylight (C) 2006 kogiidena
9 * Copylight (C) 2002 Atom Create Engineering Co., Ltd. *
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/kdev_t.h>
14 #include <linux/cdev.h>
17 #include <linux/uaccess.h>
18 #include <mach-landisk/mach/gio.h>
19 #include <mach-landisk/mach/iodata_landisk.h>
22 #define GIO_MINOR 2 /* GIO minor no. */
25 static struct cdev *cdev_p;
28 static int gio_open(struct inode *inode, struct file *filp)
34 minor = MINOR(inode->i_rdev);
35 if (minor < DEVCOUNT) {
47 static int gio_close(struct inode *inode, struct file *filp)
51 minor = MINOR(inode->i_rdev);
52 if (minor < DEVCOUNT) {
58 static long gio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
61 static unsigned int addr = 0;
63 if (cmd & 0x01) { /* write */
64 if (copy_from_user(&data, (int *)arg, sizeof(int))) {
70 case GIODRV_IOCSGIOSETADDR: /* address set */
74 case GIODRV_IOCSGIODATA1: /* write byte */
75 __raw_writeb((unsigned char)(0x0ff & data), addr);
78 case GIODRV_IOCSGIODATA2: /* write word */
82 __raw_writew((unsigned short int)(0x0ffff & data), addr);
85 case GIODRV_IOCSGIODATA4: /* write long */
89 __raw_writel(data, addr);
92 case GIODRV_IOCGGIODATA1: /* read byte */
93 data = __raw_readb(addr);
96 case GIODRV_IOCGGIODATA2: /* read word */
100 data = __raw_readw(addr);
103 case GIODRV_IOCGGIODATA4: /* read long */
107 data = __raw_readl(addr);
114 if ((cmd & 0x01) == 0) { /* read */
115 if (copy_to_user((int *)arg, &data, sizeof(int))) {
122 static const struct file_operations gio_fops = {
123 .owner = THIS_MODULE,
124 .open = gio_open, /* open */
125 .release = gio_close, /* release */
126 .unlocked_ioctl = gio_ioctl,
127 .llseek = noop_llseek,
130 static int __init gio_init(void)
134 printk(KERN_INFO "gio: driver initialized\n");
138 if ((error = alloc_chrdev_region(&dev, 0, DEVCOUNT, "gio")) < 0) {
140 "gio: Couldn't alloc_chrdev_region, error=%d\n",
145 cdev_p = cdev_alloc();
146 cdev_p->ops = &gio_fops;
147 error = cdev_add(cdev_p, dev, DEVCOUNT);
150 "gio: Couldn't cdev_add, error=%d\n", error);
157 static void __exit gio_exit(void)
160 unregister_chrdev_region(dev, DEVCOUNT);
163 module_init(gio_init);
164 module_exit(gio_exit);
166 MODULE_LICENSE("GPL");