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Input: add generic support for sparse keymaps

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More and more devices choose to reimplement support for sparse keymaps
first introduced by wistron driver. Move it into a library module so it
can be easily used by interested parties.

Reviewed-by: Anisse Astier <anisse@astier.eu>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov
2009-12-04 10:22:23 -08:00
parent 6a47081c37
commit 36203c4f3d
6 changed files with 347 additions and 12 deletions
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14
drivers/input/input-polldev.c
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@@ -212,7 +212,7 @@ EXPORT_SYMBOL(input_allocate_polled_device);
* @dev: device to free
*
* The function frees memory allocated for polling device and drops
* reference to the associated input device (if present).
* reference to the associated input device.
*/
void input_free_polled_device(struct input_polled_dev *dev)
{
@@ -258,6 +258,15 @@ int input_register_polled_device(struct input_polled_dev *dev)
return error;
}
/*
* Take extra reference to the underlying input device so
* that it survives call to input_unregister_polled_device()
* and is deleted only after input_free_polled_device()
* has been invoked. This is needed to ease task of freeing
* sparse keymaps.
*/
input_get_device(input);
return 0;
}
EXPORT_SYMBOL(input_register_polled_device);
@@ -269,8 +278,6 @@ EXPORT_SYMBOL(input_register_polled_device);
* The function unregisters previously registered polled input
* device from input layer. Polling is stopped and device is
* ready to be freed with call to input_free_polled_device().
* Callers should not attempt to access dev->input pointer
* after calling this function.
*/
void input_unregister_polled_device(struct input_polled_dev *dev)
{
@@ -278,7 +285,6 @@ void input_unregister_polled_device(struct input_polled_dev *dev)
&input_polldev_attribute_group);
input_unregister_device(dev->input);
dev->input = NULL;
}
EXPORT_SYMBOL(input_unregister_polled_device);