Fixed MTP to work with TWRP

arch/sh/boards/mach-landisk/gio.c

@@ -0,0 +1,170 @@
+/*
+ * arch/sh/boards/landisk/gio.c - driver for landisk
+ *
+ * This driver will also support the I-O DATA Device, Inc. LANDISK Board.
+ * LANDISK and USL-5P Button, LED and GIO driver drive function.
+ *
+ *   Copylight (C) 2006 kogiidena
+ *   Copylight (C) 2002 Atom Create Engineering Co., Ltd. *
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kdev_t.h>
+#include <linux/cdev.h>
+#include <linux/fs.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <mach-landisk/mach/gio.h>
+#include <mach-landisk/mach/iodata_landisk.h>
+
+#define DEVCOUNT                4
+#define GIO_MINOR	        2	/* GIO minor no. */
+
+static dev_t dev;
+static struct cdev *cdev_p;
+static int openCnt;
+
+static int gio_open(struct inode *inode, struct file *filp)
+{
+	int minor;
+	int ret = -ENOENT;
+
+	preempt_disable();
+	minor = MINOR(inode->i_rdev);
+	if (minor < DEVCOUNT) {
+		if (openCnt > 0) {
+			ret = -EALREADY;
+		} else {
+			openCnt++;
+			ret = 0;
+		}
+	}
+	preempt_enable();
+	return ret;
+}
+
+static int gio_close(struct inode *inode, struct file *filp)
+{
+	int minor;
+
+	minor = MINOR(inode->i_rdev);
+	if (minor < DEVCOUNT) {
+		openCnt--;
+	}
+	return 0;
+}
+
+static long gio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	unsigned int data;
+	static unsigned int addr = 0;
+
+	if (cmd & 0x01) {	/* write */
+		if (copy_from_user(&data, (int *)arg, sizeof(int))) {
+			return -EFAULT;
+		}
+	}
+
+	switch (cmd) {
+	case GIODRV_IOCSGIOSETADDR:	/* address set */
+		addr = data;
+		break;
+
+	case GIODRV_IOCSGIODATA1:	/* write byte */
+		__raw_writeb((unsigned char)(0x0ff & data), addr);
+		break;
+
+	case GIODRV_IOCSGIODATA2:	/* write word */
+		if (addr & 0x01) {
+			return -EFAULT;
+		}
+		__raw_writew((unsigned short int)(0x0ffff & data), addr);
+		break;
+
+	case GIODRV_IOCSGIODATA4:	/* write long */
+		if (addr & 0x03) {
+			return -EFAULT;
+		}
+		__raw_writel(data, addr);
+		break;
+
+	case GIODRV_IOCGGIODATA1:	/* read byte */
+		data = __raw_readb(addr);
+		break;
+
+	case GIODRV_IOCGGIODATA2:	/* read word */
+		if (addr & 0x01) {
+			return -EFAULT;
+		}
+		data = __raw_readw(addr);
+		break;
+
+	case GIODRV_IOCGGIODATA4:	/* read long */
+		if (addr & 0x03) {
+			return -EFAULT;
+		}
+		data = __raw_readl(addr);
+		break;
+	default:
+		return -EFAULT;
+		break;
+	}
+
+	if ((cmd & 0x01) == 0) {	/* read */
+		if (copy_to_user((int *)arg, &data, sizeof(int))) {
+			return -EFAULT;
+		}
+	}
+	return 0;
+}
+
+static const struct file_operations gio_fops = {
+	.owner = THIS_MODULE,
+	.open = gio_open,	/* open */
+	.release = gio_close,	/* release */
+	.unlocked_ioctl = gio_ioctl,
+	.llseek = noop_llseek,
+};
+
+static int __init gio_init(void)
+{
+	int error;
+
+	printk(KERN_INFO "gio: driver initialized\n");
+
+	openCnt = 0;
+
+	if ((error = alloc_chrdev_region(&dev, 0, DEVCOUNT, "gio")) < 0) {
+		printk(KERN_ERR
+		       "gio: Couldn't alloc_chrdev_region, error=%d\n",
+		       error);
+		return 1;
+	}
+
+	cdev_p = cdev_alloc();
+	cdev_p->ops = &gio_fops;
+	error = cdev_add(cdev_p, dev, DEVCOUNT);
+	if (error) {
+		printk(KERN_ERR
+		       "gio: Couldn't cdev_add, error=%d\n", error);
+		return 1;
+	}
+
+	return 0;
+}
+
+static void __exit gio_exit(void)
+{
+	cdev_del(cdev_p);
+	unregister_chrdev_region(dev, DEVCOUNT);
+}
+
+module_init(gio_init);
+module_exit(gio_exit);
+
+MODULE_LICENSE("GPL");