Input: implement new force feedback interface

Implement a new force feedback interface, in which all non-driver-specific
operations are separated to a common module. This includes handling effect
type validations, locking, etc.

The effects are now file descriptor specific instead of the previous strange
half-process half-fd specific behaviour. The effect memory of devices is not
emptied if the root user opens and closes the device while another user is
using effects. This is a minor change and most likely no force feedback
aware programs are affected by this negatively.

Otherwise the userspace interface is left unaltered.

Signed-off-by: Anssi Hannula <anssi.hannula@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 15 insertions, 17 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 4bf48188cc91..12c7ab876c34 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -391,8 +391,10 @@ static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
         struct evdev *evdev = list->evdev;
         struct input_dev *dev = evdev->handle.dev;
         struct input_absinfo abs;
+        struct ff_effect effect;
         int __user *ip = (int __user *)p;
         int i, t, u, v;
+        int error;
 
         if (!evdev->exist)
                 return -ENODEV;
@@ -460,27 +462,22 @@ static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
                         return 0;
 
                 case EVIOCSFF:
-                        if (dev->upload_effect) {
-                                struct ff_effect effect;
-                                int err;
-
-                                if (copy_from_user(&effect, p, sizeof(effect)))
-                                        return -EFAULT;
-                                err = dev->upload_effect(dev, &effect);
-                                if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
-                                        return -EFAULT;
-                                return err;
-                        } else
-                                return -ENOSYS;
+                        if (copy_from_user(&effect, p, sizeof(effect)))
+                                return -EFAULT;
 
-                case EVIOCRMFF:
-                        if (!dev->erase_effect)
-                                return -ENOSYS;
+                        error = input_ff_upload(dev, &effect, file);
 
-                        return dev->erase_effect(dev, (int)(unsigned long) p);
+                        if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
+                                return -EFAULT;
+
+                        return error;
+
+                case EVIOCRMFF:
+                        return input_ff_erase(dev, (int)(unsigned long) p, file);
 
                 case EVIOCGEFFECTS:
-                        if (put_user(dev->ff_effects_max, ip))
+                        i = test_bit(EV_FF, dev->evbit) ? dev->ff->max_effects : 0;
+                        if (put_user(i, ip))
                                 return -EFAULT;
                         return 0;
 
@@ -669,6 +666,7 @@ static void evdev_disconnect(struct input_handle *handle)
         evdev->exist = 0;
 
         if (evdev->open) {
+                input_flush_device(handle, NULL);
                 input_close_device(handle);
                 wake_up_interruptible(&evdev->wait);
                 list_for_each_entry(list, &evdev->list, node)