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: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 20 insertions, 4 deletions

diff --git a/drivers/misc/phantom.c b/drivers/misc/phantom.c
index 7fa61e907e1c..5447a603686a 100644
--- a/drivers/misc/phantom.c
+++ b/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,
 };