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>
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@ -1599,11 +1599,14 @@ EXPORT_SYMBOL(input_free_device);
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* @dev: input device supporting MT events and finger tracking
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* @num_slots: number of slots used by the device
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*
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* This function allocates all necessary memory for MT slot handling
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* in the input device, and adds ABS_MT_SLOT to the device capabilities.
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* This function allocates all necessary memory for MT slot handling in the
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* input device, and adds ABS_MT_SLOT to the device capabilities. All slots
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* are initially marked as unused iby setting ABS_MT_TRACKING_ID to -1.
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*/
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int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots)
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{
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int i;
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if (!num_slots)
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return 0;
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@ -1614,6 +1617,10 @@ int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots)
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dev->mtsize = num_slots;
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input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0);
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/* Mark slots as 'unused' */
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for (i = 0; i < num_slots; i++)
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dev->mt[i].abs[ABS_MT_TRACKING_ID - ABS_MT_FIRST] = -1;
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return 0;
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}
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EXPORT_SYMBOL(input_mt_create_slots);
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