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Input: dynamically allocate ABS information

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As all callers are now changed to only use the input_abs_*() access
helpers, switching over to dynamically allocated ABS information is
easy. This reduces size of struct input_dev from 3152 to 1640 on
64 bit architectures.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Daniel Mack 2010-08-02 20:18:21 -07:00 • committed by Dmitry Torokhov
parent 987a6c0298
commit d31b2865a4
3 changed files with 63 additions and 57 deletions
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21
drivers/input/evdev.c
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@ -649,13 +649,7 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
t = _IOC_NR(cmd) & ABS_MAX;
abs.value = input_abs_get_val(dev, t);
abs.minimum = input_abs_get_min(dev, t);
abs.maximum = input_abs_get_max(dev, t);
abs.fuzz = input_abs_get_fuzz(dev, t);
abs.flat = input_abs_get_flat(dev, t);
abs.resolution = input_abs_get_res(dev, t);
abs = dev->absinfo[t];
if (copy_to_user(p, &abs, min_t(size_t,
_IOC_SIZE(cmd),
@ -691,6 +685,9 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
sizeof(struct input_absinfo))))
return -EFAULT;
if (_IOC_SIZE(cmd) < sizeof(struct input_absinfo))
abs.resolution = 0;
/* We can't change number of reserved MT slots */
if (t == ABS_MT_SLOT)
return -EINVAL;
@ -701,15 +698,7 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
* of event.
*/
spin_lock_irq(&dev->event_lock);
input_abs_set_val(dev, t, abs.value);
input_abs_set_min(dev, t, abs.minimum);
input_abs_set_max(dev, t, abs.maximum);
input_abs_set_fuzz(dev, t, abs.fuzz);
input_abs_set_flat(dev, t, abs.flat);
input_abs_set_res(dev, t, _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ?
0 : abs.resolution);
dev->absinfo[t] = abs;
spin_unlock_irq(&dev->event_lock);
return 0;