167 lines
3.2 KiB
C
167 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* arch/sh/boards/landisk/gio.c - driver for landisk
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*
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* This driver will also support the I-O DATA Device, Inc. LANDISK Board.
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* LANDISK and USL-5P Button, LED and GIO driver drive function.
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*
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* Copylight (C) 2006 kogiidena
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* Copylight (C) 2002 Atom Create Engineering Co., Ltd. *
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kdev_t.h>
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#include <linux/cdev.h>
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#include <linux/fs.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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#include <mach-landisk/mach/gio.h>
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#include <mach-landisk/mach/iodata_landisk.h>
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#define DEVCOUNT 4
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#define GIO_MINOR 2 /* GIO minor no. */
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static dev_t dev;
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static struct cdev *cdev_p;
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static int openCnt;
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static int gio_open(struct inode *inode, struct file *filp)
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{
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int minor;
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int ret = -ENOENT;
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preempt_disable();
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minor = MINOR(inode->i_rdev);
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if (minor < DEVCOUNT) {
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if (openCnt > 0) {
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ret = -EALREADY;
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} else {
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openCnt++;
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ret = 0;
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}
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}
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preempt_enable();
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return ret;
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}
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static int gio_close(struct inode *inode, struct file *filp)
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{
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int minor;
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minor = MINOR(inode->i_rdev);
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if (minor < DEVCOUNT) {
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openCnt--;
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}
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return 0;
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}
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static long gio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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unsigned int data;
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static unsigned int addr = 0;
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if (cmd & 0x01) { /* write */
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if (copy_from_user(&data, (int *)arg, sizeof(int))) {
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return -EFAULT;
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}
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}
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switch (cmd) {
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case GIODRV_IOCSGIOSETADDR: /* address set */
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addr = data;
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break;
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case GIODRV_IOCSGIODATA1: /* write byte */
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__raw_writeb((unsigned char)(0x0ff & data), addr);
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break;
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case GIODRV_IOCSGIODATA2: /* write word */
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if (addr & 0x01) {
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return -EFAULT;
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}
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__raw_writew((unsigned short int)(0x0ffff & data), addr);
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break;
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case GIODRV_IOCSGIODATA4: /* write long */
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if (addr & 0x03) {
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return -EFAULT;
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}
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__raw_writel(data, addr);
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break;
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case GIODRV_IOCGGIODATA1: /* read byte */
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data = __raw_readb(addr);
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break;
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case GIODRV_IOCGGIODATA2: /* read word */
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if (addr & 0x01) {
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return -EFAULT;
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}
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data = __raw_readw(addr);
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break;
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case GIODRV_IOCGGIODATA4: /* read long */
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if (addr & 0x03) {
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return -EFAULT;
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}
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data = __raw_readl(addr);
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break;
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default:
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return -EFAULT;
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break;
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}
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if ((cmd & 0x01) == 0) { /* read */
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if (copy_to_user((int *)arg, &data, sizeof(int))) {
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return -EFAULT;
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}
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}
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return 0;
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}
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static const struct file_operations gio_fops = {
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.owner = THIS_MODULE,
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.open = gio_open, /* open */
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.release = gio_close, /* release */
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.unlocked_ioctl = gio_ioctl,
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.llseek = noop_llseek,
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};
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static int __init gio_init(void)
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{
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int error;
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printk(KERN_INFO "gio: driver initialized\n");
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openCnt = 0;
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if ((error = alloc_chrdev_region(&dev, 0, DEVCOUNT, "gio")) < 0) {
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printk(KERN_ERR
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"gio: Couldn't alloc_chrdev_region, error=%d\n",
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error);
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return 1;
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}
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cdev_p = cdev_alloc();
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cdev_p->ops = &gio_fops;
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error = cdev_add(cdev_p, dev, DEVCOUNT);
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if (error) {
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printk(KERN_ERR
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"gio: Couldn't cdev_add, error=%d\n", error);
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return 1;
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}
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return 0;
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}
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static void __exit gio_exit(void)
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{
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cdev_del(cdev_p);
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unregister_chrdev_region(dev, DEVCOUNT);
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}
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module_init(gio_init);
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module_exit(gio_exit);
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MODULE_LICENSE("GPL");
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