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authorDaniel Mack <daniel@caiaq.de>2010-08-03 07:18:21 +0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2010-08-03 07:30:04 +0400
commitd31b2865a4e8a9dd02f39e56c8fadb824c5e187b (patch)
treecbe062757aa54c88c8e9ae2bf6ff87f791313c60 /drivers/input/input.c
parent987a6c0298260b7aa40702b349282554d6180e4b (diff)
downloadlinux-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/input.c')
-rw-r--r--drivers/input/input.c42
1 files changed, 40 insertions, 2 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 7259adb8619d..a9b025f4147a 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);