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author | Daniel Mack <daniel@caiaq.de> | 2010-08-03 03:18:21 (GMT) |
---|---|---|
committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2010-08-03 03:30:04 (GMT) |
commit | d31b2865a4e8a9dd02f39e56c8fadb824c5e187b (patch) | |
tree | cbe062757aa54c88c8e9ae2bf6ff87f791313c60 /drivers/input | |
parent | 987a6c0298260b7aa40702b349282554d6180e4b (diff) | |
download | linux-d31b2865a4e8a9dd02f39e56c8fadb824c5e187b.tar.xz |
Input: dynamically allocate ABS information
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>
Diffstat (limited to 'drivers/input')
-rw-r--r-- | drivers/input/evdev.c | 21 | ||||
-rw-r--r-- | drivers/input/input.c | 42 |
2 files changed, 45 insertions, 18 deletions
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index 9807c8f..08f48c0 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -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; diff --git a/drivers/input/input.c b/drivers/input/input.c index 7259adb..a9b025f 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -182,7 +182,7 @@ static int input_handle_abs_event(struct input_dev *dev, is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST; if (!is_mt_event) { - pold = &dev->abs[code]; + pold = &dev->absinfo[code].value; } else if (dev->mt) { struct input_mt_slot *mtslot = &dev->mt[dev->slot]; pold = &mtslot->abs[code - ABS_MT_FIRST]; @@ -196,7 +196,7 @@ static int input_handle_abs_event(struct input_dev *dev, if (pold) { *pval = input_defuzz_abs_event(*pval, *pold, - dev->absfuzz[code]); + dev->absinfo[code].fuzz); if (*pold == *pval) return INPUT_IGNORE_EVENT; @@ -391,6 +391,43 @@ void input_inject_event(struct input_handle *handle, EXPORT_SYMBOL(input_inject_event); /** + * input_alloc_absinfo - allocates array of input_absinfo structs + * @dev: the input device emitting absolute events + * + * If the absinfo struct the caller asked for is already allocated, this + * functions will not do anything. + */ +void input_alloc_absinfo(struct input_dev *dev) +{ + if (!dev->absinfo) + dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), + GFP_KERNEL); + + WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); +} +EXPORT_SYMBOL(input_alloc_absinfo); + +void input_set_abs_params(struct input_dev *dev, unsigned int axis, + int min, int max, int fuzz, int flat) +{ + struct input_absinfo *absinfo; + + input_alloc_absinfo(dev); + if (!dev->absinfo) + return; + + absinfo = &dev->absinfo[axis]; + absinfo->minimum = min; + absinfo->maximum = max; + absinfo->fuzz = fuzz; + absinfo->flat = flat; + + dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); +} +EXPORT_SYMBOL(input_set_abs_params); + + +/** * input_grab_device - grabs device for exclusive use * @handle: input handle that wants to own the device * @@ -1308,6 +1345,7 @@ static void input_dev_release(struct device *device) input_ff_destroy(dev); input_mt_destroy_slots(dev); + kfree(dev->absinfo); kfree(dev); module_put(THIS_MODULE); |