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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | /* * 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); |