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Input: evdev - rearrange ioctl handling
Split ioctl handling into 3 separate sections: fixed-length ioctls, variable-length ioctls and multi-number variable length handlers. This reduces identation and makes the code a bit clearer. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov
parent
d31b2865a4
commit
448cd1664a
@ -492,13 +492,15 @@ static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
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}
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#define OLD_KEY_MAX 0x1ff
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static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode)
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static int handle_eviocgbit(struct input_dev *dev,
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unsigned int type, unsigned int size,
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void __user *p, int compat_mode)
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{
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static unsigned long keymax_warn_time;
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unsigned long *bits;
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int len;
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switch (_IOC_NR(cmd) & EV_MAX) {
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switch (type) {
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case 0: bits = dev->evbit; len = EV_MAX; break;
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case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
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@ -517,7 +519,7 @@ static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user
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* EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
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* should be in bytes, not in bits.
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*/
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if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) {
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if (type == EV_KEY && size == OLD_KEY_MAX) {
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len = OLD_KEY_MAX;
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if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
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printk(KERN_WARNING
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@ -528,7 +530,7 @@ static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user
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BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
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}
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return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
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return bits_to_user(bits, len, size, p, compat_mode);
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}
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#undef OLD_KEY_MAX
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@ -542,8 +544,10 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
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struct ff_effect effect;
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int __user *ip = (int __user *)p;
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unsigned int i, t, u, v;
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unsigned int size;
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int error;
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/* First we check for fixed-length commands */
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switch (cmd) {
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case EVIOCGVERSION:
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@ -610,101 +614,102 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
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return evdev_grab(evdev, client);
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else
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return evdev_ungrab(evdev, client);
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}
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default:
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size = _IOC_SIZE(cmd);
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if (_IOC_TYPE(cmd) != 'E')
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return -EINVAL;
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/* Now check variable-length commands */
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#define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
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if (_IOC_DIR(cmd) == _IOC_READ) {
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switch (EVIOC_MASK_SIZE(cmd)) {
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if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
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return handle_eviocgbit(dev, cmd, p, compat_mode);
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case EVIOCGKEY(0):
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return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode);
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if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
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return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
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p, compat_mode);
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case EVIOCGLED(0):
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return bits_to_user(dev->led, LED_MAX, size, p, compat_mode);
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if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
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return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
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p, compat_mode);
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case EVIOCGSND(0):
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return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode);
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if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
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return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
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p, compat_mode);
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case EVIOCGSW(0):
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return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode);
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if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
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return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
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p, compat_mode);
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case EVIOCGNAME(0):
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return str_to_user(dev->name, size, p);
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if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
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return str_to_user(dev->name, _IOC_SIZE(cmd), p);
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case EVIOCGPHYS(0):
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return str_to_user(dev->phys, size, p);
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if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
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return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
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case EVIOCGUNIQ(0):
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return str_to_user(dev->uniq, size, p);
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if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
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return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
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case EVIOC_MASK_SIZE(EVIOCSFF):
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if (input_ff_effect_from_user(p, size, &effect))
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return -EFAULT;
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if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
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error = input_ff_upload(dev, &effect, file);
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t = _IOC_NR(cmd) & ABS_MAX;
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abs = dev->absinfo[t];
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if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
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return -EFAULT;
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if (copy_to_user(p, &abs, min_t(size_t,
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_IOC_SIZE(cmd),
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sizeof(struct input_absinfo))))
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return -EFAULT;
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return error;
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}
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return 0;
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}
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/* Multi-number variable-length handlers */
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if (_IOC_TYPE(cmd) != 'E')
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return -EINVAL;
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}
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if (_IOC_DIR(cmd) == _IOC_READ) {
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if (_IOC_DIR(cmd) == _IOC_WRITE) {
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if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
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return handle_eviocgbit(dev,
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_IOC_NR(cmd) & EV_MAX, size,
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p, compat_mode);
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if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) {
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if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
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if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect))
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return -EFAULT;
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t = _IOC_NR(cmd) & ABS_MAX;
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abs = dev->absinfo[t];
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error = input_ff_upload(dev, &effect, file);
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if (copy_to_user(p, &abs, min_t(size_t,
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size, sizeof(struct input_absinfo))))
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return -EFAULT;
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if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
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return -EFAULT;
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return error;
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}
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if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
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t = _IOC_NR(cmd) & ABS_MAX;
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if (copy_from_user(&abs, p, min_t(size_t,
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_IOC_SIZE(cmd),
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sizeof(struct input_absinfo))))
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return -EFAULT;
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if (_IOC_SIZE(cmd) < sizeof(struct input_absinfo))
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abs.resolution = 0;
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/* We can't change number of reserved MT slots */
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if (t == ABS_MT_SLOT)
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return -EINVAL;
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/*
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* Take event lock to ensure that we are not
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* changing device parameters in the middle
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* of event.
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*/
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spin_lock_irq(&dev->event_lock);
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dev->absinfo[t] = abs;
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spin_unlock_irq(&dev->event_lock);
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return 0;
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}
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return 0;
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}
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}
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if (_IOC_DIR(cmd) == _IOC_READ) {
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if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
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t = _IOC_NR(cmd) & ABS_MAX;
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if (copy_from_user(&abs, p, min_t(size_t,
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size, sizeof(struct input_absinfo))))
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return -EFAULT;
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if (size < sizeof(struct input_absinfo))
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abs.resolution = 0;
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/* We can't change number of reserved MT slots */
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if (t == ABS_MT_SLOT)
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return -EINVAL;
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/*
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* Take event lock to ensure that we are not
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* changing device parameters in the middle
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* of event.
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*/
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spin_lock_irq(&dev->event_lock);
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dev->absinfo[t] = abs;
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spin_unlock_irq(&dev->event_lock);
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return 0;
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}
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}
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return -EINVAL;
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}
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