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Input: synaptics - add support for reporting x/y resolution

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Synaptics uses anisotropic coordinate system.  On some wide touchpads
vertical resolution can be twice as high as horizontal which causes
unequal sensitivity on x/y directions.  Add support for reading the
resolution with EVIOCGABS ioctl.

Signed-off-by: Tero Saarni <tero.saarni@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Tero Saarni
2009-06-10 23:27:24 -07:00
committed by Dmitry Torokhov
parent d7ed5d883c
commit ec20a022aa
4 changed files with 41 additions and 3 deletions
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12
drivers/input/evdev.c
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@ -626,8 +626,11 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
abs.maximum = dev->absmax[t];
abs.fuzz = dev->absfuzz[t];
abs.flat = dev->absflat[t];
abs.resolution = dev->absres[t];
if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
if (copy_to_user(p, &abs, min_t(size_t,
_IOC_SIZE(cmd),
sizeof(struct input_absinfo))))
return -EFAULT;
return 0;
@ -654,8 +657,9 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
t = _IOC_NR(cmd) & ABS_MAX;
if (copy_from_user(&abs, p,
sizeof(struct input_absinfo)))
if (copy_from_user(&abs, p, min_t(size_t,
_IOC_SIZE(cmd),
sizeof(struct input_absinfo))))
return -EFAULT;
/*
@ -670,6 +674,8 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
dev->absmax[t] = abs.maximum;
dev->absfuzz[t] = abs.fuzz;
dev->absflat[t] = abs.flat;
dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ?
0 : abs.resolution;
spin_unlock_irq(&dev->event_lock);