--- /dev/null
+/*
+ * Input Multitouch Library
+ *
+ * Copyright (c) 2008-2010 Henrik Rydberg
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/input/mt.h>
+#include <linux/slab.h>
+
+#define TRKID_SGN ((TRKID_MAX + 1) >> 1)
+
+/**
+ * input_mt_init_slots() - initialize MT input slots
+ * @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, prepares the ABS_MT_SLOT and
+ * ABS_MT_TRACKING_ID events for use and sets up appropriate buffers.
+ * May be called repeatedly. Returns -EINVAL if attempting to
+ * reinitialize with a different number of slots.
+ */
+int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots)
+{
+ int i;
+
+ if (!num_slots)
+ return 0;
+ if (dev->mt)
+ return dev->mtsize != num_slots ? -EINVAL : 0;
+
+ dev->mt = kcalloc(num_slots, sizeof(struct input_mt_slot), GFP_KERNEL);
+ if (!dev->mt)
+ return -ENOMEM;
+
+ dev->mtsize = num_slots;
+ input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0);
+ input_set_abs_params(dev, ABS_MT_TRACKING_ID, 0, TRKID_MAX, 0, 0);
+ input_set_events_per_packet(dev, 6 * num_slots);
+
+ /* Mark slots as 'unused' */
+ for (i = 0; i < num_slots; i++)
+ input_mt_set_value(&dev->mt[i], ABS_MT_TRACKING_ID, -1);
+
+ return 0;
+}
+EXPORT_SYMBOL(input_mt_init_slots);
+
+/**
+ * input_mt_destroy_slots() - frees the MT slots of the input device
+ * @dev: input device with allocated MT slots
+ *
+ * This function is only needed in error path as the input core will
+ * automatically free the MT slots when the device is destroyed.
+ */
+void input_mt_destroy_slots(struct input_dev *dev)
+{
+ kfree(dev->mt);
+ dev->mt = NULL;
+ dev->mtsize = 0;
+ dev->slot = 0;
+ dev->trkid = 0;
+}
+EXPORT_SYMBOL(input_mt_destroy_slots);
+
+/**
+ * input_mt_report_slot_state() - report contact state
+ * @dev: input device with allocated MT slots
+ * @tool_type: the tool type to use in this slot
+ * @active: true if contact is active, false otherwise
+ *
+ * Reports a contact via ABS_MT_TRACKING_ID, and optionally
+ * ABS_MT_TOOL_TYPE. If active is true and the slot is currently
+ * inactive, or if the tool type is changed, a new tracking id is
+ * assigned to the slot. The tool type is only reported if the
+ * corresponding absbit field is set.
+ */
+void input_mt_report_slot_state(struct input_dev *dev,
+ unsigned int tool_type, bool active)
+{
+ struct input_mt_slot *mt;
+ int id;
+
+ if (!dev->mt || !active) {
+ input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1);
+ return;
+ }
+
+ mt = &dev->mt[dev->slot];
+ id = input_mt_get_value(mt, ABS_MT_TRACKING_ID);
+ if (id < 0 || input_mt_get_value(mt, ABS_MT_TOOL_TYPE) != tool_type)
+ id = input_mt_new_trkid(dev);
+
+ input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, id);
+ input_event(dev, EV_ABS, ABS_MT_TOOL_TYPE, tool_type);
+}
+EXPORT_SYMBOL(input_mt_report_slot_state);
+
+/**
+ * input_mt_report_finger_count() - report contact count
+ * @dev: input device with allocated MT slots
+ * @count: the number of contacts
+ *
+ * Reports the contact count via BTN_TOOL_FINGER, BTN_TOOL_DOUBLETAP,
+ * BTN_TOOL_TRIPLETAP and BTN_TOOL_QUADTAP.
+ *
+ * The input core ensures only the KEY events already setup for
+ * this device will produce output.
+ */
+void input_mt_report_finger_count(struct input_dev *dev, int count)
+{
+ input_event(dev, EV_KEY, BTN_TOOL_FINGER, count == 1);
+ input_event(dev, EV_KEY, BTN_TOOL_DOUBLETAP, count == 2);
+ input_event(dev, EV_KEY, BTN_TOOL_TRIPLETAP, count == 3);
+ input_event(dev, EV_KEY, BTN_TOOL_QUADTAP, count == 4);
+}
+EXPORT_SYMBOL(input_mt_report_finger_count);
+
+/**
+ * input_mt_report_pointer_emulation() - common pointer emulation
+ * @dev: input device with allocated MT slots
+ * @use_count: report number of active contacts as finger count
+ *
+ * Performs legacy pointer emulation via BTN_TOUCH, ABS_X, ABS_Y and
+ * ABS_PRESSURE. Touchpad finger count is emulated if use_count is true.
+ *
+ * The input core ensures only the KEY and ABS axes already setup for
+ * this device will produce output.
+ */
+void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count)
+{
+ struct input_mt_slot *oldest = 0;
+ int oldid = dev->trkid;
+ int count = 0;
+ int i;
+
+ for (i = 0; i < dev->mtsize; ++i) {
+ struct input_mt_slot *ps = &dev->mt[i];
+ int id = input_mt_get_value(ps, ABS_MT_TRACKING_ID);
+
+ if (id < 0)
+ continue;
+ if ((id - oldid) & TRKID_SGN) {
+ oldest = ps;
+ oldid = id;
+ }
+ count++;
+ }
+
+ input_event(dev, EV_KEY, BTN_TOUCH, count > 0);
+ if (use_count)
+ input_mt_report_finger_count(dev, count);
+
+ if (oldest) {
+ int x = input_mt_get_value(oldest, ABS_MT_POSITION_X);
+ int y = input_mt_get_value(oldest, ABS_MT_POSITION_Y);
+ int p = input_mt_get_value(oldest, ABS_MT_PRESSURE);
+
+ input_event(dev, EV_ABS, ABS_X, x);
+ input_event(dev, EV_ABS, ABS_Y, y);
+ input_event(dev, EV_ABS, ABS_PRESSURE, p);
+ } else {
+ input_event(dev, EV_ABS, ABS_PRESSURE, 0);
+ }
+}
+EXPORT_SYMBOL(input_mt_report_pointer_emulation);
projects / mv-sheeva.git / blobdiff