Misc: phantom, add compat ioctl

Openhaptics uses pointers in _IOC() macros, implement compat for them. Also
add _IOC alternatives which are not 32/64 bit dependent (structures
passed through aren't yet) -- libphantom will use them.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: NJiri Slaby <jirislaby@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/misc/phantom.c

@@ -12,6 +12,7 @@
  *  or alternatively, you might use OpenHaptics provided by Sensable.
  */
 
+#include <linux/compat.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/device.h>
@@ -91,11 +92,8 @@ static long phantom_ioctl(struct file *file, unsigned int cmd,
 	unsigned long flags;
 	unsigned int i;
 
-	if (_IOC_TYPE(cmd) != PH_IOC_MAGIC ||
-			_IOC_NR(cmd) > PH_IOC_MAXNR)
-		return -ENOTTY;
-
 	switch (cmd) {
+	case PHN_SETREG:
 	case PHN_SET_REG:
 		if (copy_from_user(&r, argp, sizeof(r)))
 			return -EFAULT;
@@ -126,6 +124,7 @@ static long phantom_ioctl(struct file *file, unsigned int cmd,
 			phantom_status(dev, dev->status & ~PHB_RUNNING);
 		spin_unlock_irqrestore(&dev->regs_lock, flags);
 		break;
+	case PHN_SETREGS:
 	case PHN_SET_REGS:
 		if (copy_from_user(&rs, argp, sizeof(rs)))
 			return -EFAULT;
@@ -143,6 +142,7 @@ static long phantom_ioctl(struct file *file, unsigned int cmd,
 		}
 		spin_unlock_irqrestore(&dev->regs_lock, flags);
 		break;
+	case PHN_GETREG:
 	case PHN_GET_REG:
 		if (copy_from_user(&r, argp, sizeof(r)))
 			return -EFAULT;
@@ -155,6 +155,7 @@ static long phantom_ioctl(struct file *file, unsigned int cmd,
 		if (copy_to_user(argp, &r, sizeof(r)))
 			return -EFAULT;
 		break;
+	case PHN_GETREGS:
 	case PHN_GET_REGS: {
 		u32 m;
 
@@ -191,6 +192,20 @@ static long phantom_ioctl(struct file *file, unsigned int cmd,
 	return 0;
 }
 
+#ifdef CONFIG_COMPAT
+static long phantom_compat_ioctl(struct file *filp, unsigned int cmd,
+		unsigned long arg)
+{
+	if (_IOC_NR(cmd) <= 3 && _IOC_SIZE(cmd) == sizeof(compat_uptr_t)) {
+		cmd &= ~(_IOC_SIZEMASK << _IOC_SIZESHIFT);
+		cmd |= sizeof(void *) << _IOC_SIZESHIFT;
+	}
+	return phantom_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
+}
+#else
+#define phantom_compat_ioctl NULL
+#endif
+
 static int phantom_open(struct inode *inode, struct file *file)
 {
 	struct phantom_device *dev = container_of(inode->i_cdev,
@@ -253,6 +268,7 @@ static struct file_operations phantom_file_ops = {
 	.open = phantom_open,
 	.release = phantom_release,
 	.unlocked_ioctl = phantom_ioctl,
+	.compat_ioctl = phantom_compat_ioctl,
 	.poll = phantom_poll,
 };
 

include/linux/phantom.h

@@ -34,7 +34,10 @@ struct phm_regs {
  * use improved registers update (no more phantom switchoffs when using
  * libphantom) */
 #define PHN_NOT_OH		_IO  (PH_IOC_MAGIC, 4)
-#define PH_IOC_MAXNR		4
+#define PHN_GETREG		_IOWR(PH_IOC_MAGIC, 5, struct phm_reg)
+#define PHN_SETREG		_IOW(PH_IOC_MAGIC, 6, struct phm_reg)
+#define PHN_GETREGS		_IOWR(PH_IOC_MAGIC, 7, struct phm_regs)
+#define PHN_SETREGS		_IOW(PH_IOC_MAGIC, 8, struct phm_regs)
 
 #define PHN_CONTROL		0x6     /* control byte in iaddr space */
 #define PHN_CTL_AMP		0x1     /*   switch after torques change */