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| author | Henrik Rydberg <rydberg@euromail.se> | 2010-08-28 21:33:50 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2010-08-28 21:39:43 -0700 |
| commit | ba4d695a90c9176fca8e45d6c872bbf4e8bed315 (patch) | |
| tree | 48e9cefe52865fe5d1f24268081dc87139b3618f /drivers/input/input.c | |
| parent | 2c4e9671edfef534e9726366707d64e63d44e7e6 (diff) | |
| download | linux-stable-ba4d695a90c9176fca8e45d6c872bbf4e8bed315.tar.gz linux-stable-ba4d695a90c9176fca8e45d6c872bbf4e8bed315.tar.bz2 linux-stable-ba4d695a90c9176fca8e45d6c872bbf4e8bed315.zip | |
Input: MT - initialize slots to unused
For MT slots, the ABS_MT_TRACKING_ID determines whether a slot is in use,
but currently leaves initialization up to the drivers. This patch sets the
slot state to unused upon creation.
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/input.c')
| -rw-r--r-- | drivers/input/input.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c index a9b025f4147a..ab6982056518 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -1599,11 +1599,14 @@ EXPORT_SYMBOL(input_free_device); * @dev: input device supporting MT events and finger tracking * @num_slots: number of slots used by the device * - * This function allocates all necessary memory for MT slot handling - * in the input device, and adds ABS_MT_SLOT to the device capabilities. + * This function allocates all necessary memory for MT slot handling in the + * input device, and adds ABS_MT_SLOT to the device capabilities. All slots + * are initially marked as unused iby setting ABS_MT_TRACKING_ID to -1. */ int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots) { + int i; + if (!num_slots) return 0; @@ -1614,6 +1617,10 @@ int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots) dev->mtsize = num_slots; input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0); + /* Mark slots as 'unused' */ + for (i = 0; i < num_slots; i++) + dev->mt[i].abs[ABS_MT_TRACKING_ID - ABS_MT_FIRST] = -1; + return 0; } EXPORT_SYMBOL(input_mt_create_slots); |