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| 1 | /* |
| 2 | * Input Multitouch Library |
| 3 | * |
| 4 | * Copyright (c) 2008-2010 Henrik Rydberg |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 as published by |
| 8 | * the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/input/mt.h> |
| 12 | #include <linux/export.h> |
| 13 | #include <linux/slab.h> |
| 14 | |
| 15 | #define TRKID_SGN ((TRKID_MAX + 1) >> 1) |
| 16 | |
| 17 | /** |
| 18 | * input_mt_init_slots() - initialize MT input slots |
| 19 | * @dev: input device supporting MT events and finger tracking |
| 20 | * @num_slots: number of slots used by the device |
| 21 | * |
| 22 | * This function allocates all necessary memory for MT slot handling |
| 23 | * in the input device, prepares the ABS_MT_SLOT and |
| 24 | * ABS_MT_TRACKING_ID events for use and sets up appropriate buffers. |
| 25 | * May be called repeatedly. Returns -EINVAL if attempting to |
| 26 | * reinitialize with a different number of slots. |
| 27 | */ |
| 28 | int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots) |
| 29 | { |
| 30 | int i; |
| 31 | |
| 32 | if (!num_slots) |
| 33 | return 0; |
| 34 | if (dev->mt) |
| 35 | return dev->mtsize != num_slots ? -EINVAL : 0; |
| 36 | |
| 37 | dev->mt = kcalloc(num_slots, sizeof(struct input_mt_slot), GFP_KERNEL); |
| 38 | if (!dev->mt) |
| 39 | return -ENOMEM; |
| 40 | |
| 41 | dev->mtsize = num_slots; |
| 42 | input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0); |
| 43 | input_set_abs_params(dev, ABS_MT_TRACKING_ID, 0, TRKID_MAX, 0, 0); |
| 44 | input_set_events_per_packet(dev, 6 * num_slots); |
| 45 | |
| 46 | /* Mark slots as 'unused' */ |
| 47 | for (i = 0; i < num_slots; i++) |
| 48 | input_mt_set_value(&dev->mt[i], ABS_MT_TRACKING_ID, -1); |
| 49 | |
| 50 | return 0; |
| 51 | } |
| 52 | EXPORT_SYMBOL(input_mt_init_slots); |
| 53 | |
| 54 | /** |
| 55 | * input_mt_destroy_slots() - frees the MT slots of the input device |
| 56 | * @dev: input device with allocated MT slots |
| 57 | * |
| 58 | * This function is only needed in error path as the input core will |
| 59 | * automatically free the MT slots when the device is destroyed. |
| 60 | */ |
| 61 | void input_mt_destroy_slots(struct input_dev *dev) |
| 62 | { |
| 63 | kfree(dev->mt); |
| 64 | dev->mt = NULL; |
| 65 | dev->mtsize = 0; |
| 66 | dev->slot = 0; |
| 67 | dev->trkid = 0; |
| 68 | } |
| 69 | EXPORT_SYMBOL(input_mt_destroy_slots); |
| 70 | |
| 71 | /** |
| 72 | * input_mt_report_slot_state() - report contact state |
| 73 | * @dev: input device with allocated MT slots |
| 74 | * @tool_type: the tool type to use in this slot |
| 75 | * @active: true if contact is active, false otherwise |
| 76 | * |
| 77 | * Reports a contact via ABS_MT_TRACKING_ID, and optionally |
| 78 | * ABS_MT_TOOL_TYPE. If active is true and the slot is currently |
| 79 | * inactive, or if the tool type is changed, a new tracking id is |
| 80 | * assigned to the slot. The tool type is only reported if the |
| 81 | * corresponding absbit field is set. |
| 82 | */ |
| 83 | void input_mt_report_slot_state(struct input_dev *dev, |
| 84 | unsigned int tool_type, bool active) |
| 85 | { |
| 86 | struct input_mt_slot *mt; |
| 87 | int id; |
| 88 | |
| 89 | if (!dev->mt || !active) { |
| 90 | input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, -1); |
| 91 | return; |
| 92 | } |
| 93 | |
| 94 | mt = &dev->mt[dev->slot]; |
| 95 | id = input_mt_get_value(mt, ABS_MT_TRACKING_ID); |
| 96 | if (id < 0 || input_mt_get_value(mt, ABS_MT_TOOL_TYPE) != tool_type) |
| 97 | id = input_mt_new_trkid(dev); |
| 98 | |
| 99 | input_event(dev, EV_ABS, ABS_MT_TRACKING_ID, id); |
| 100 | input_event(dev, EV_ABS, ABS_MT_TOOL_TYPE, tool_type); |
| 101 | } |
| 102 | EXPORT_SYMBOL(input_mt_report_slot_state); |
| 103 | |
| 104 | /** |
| 105 | * input_mt_report_finger_count() - report contact count |
| 106 | * @dev: input device with allocated MT slots |
| 107 | * @count: the number of contacts |
| 108 | * |
| 109 | * Reports the contact count via BTN_TOOL_FINGER, BTN_TOOL_DOUBLETAP, |
| 110 | * BTN_TOOL_TRIPLETAP and BTN_TOOL_QUADTAP. |
| 111 | * |
| 112 | * The input core ensures only the KEY events already setup for |
| 113 | * this device will produce output. |
| 114 | */ |
| 115 | void input_mt_report_finger_count(struct input_dev *dev, int count) |
| 116 | { |
| 117 | input_event(dev, EV_KEY, BTN_TOOL_FINGER, count == 1); |
| 118 | input_event(dev, EV_KEY, BTN_TOOL_DOUBLETAP, count == 2); |
| 119 | input_event(dev, EV_KEY, BTN_TOOL_TRIPLETAP, count == 3); |
| 120 | input_event(dev, EV_KEY, BTN_TOOL_QUADTAP, count == 4); |
| 121 | input_event(dev, EV_KEY, BTN_TOOL_QUINTTAP, count == 5); |
| 122 | } |
| 123 | EXPORT_SYMBOL(input_mt_report_finger_count); |
| 124 | |
| 125 | /** |
| 126 | * input_mt_report_pointer_emulation() - common pointer emulation |
| 127 | * @dev: input device with allocated MT slots |
| 128 | * @use_count: report number of active contacts as finger count |
| 129 | * |
| 130 | * Performs legacy pointer emulation via BTN_TOUCH, ABS_X, ABS_Y and |
| 131 | * ABS_PRESSURE. Touchpad finger count is emulated if use_count is true. |
| 132 | * |
| 133 | * The input core ensures only the KEY and ABS axes already setup for |
| 134 | * this device will produce output. |
| 135 | */ |
| 136 | void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count) |
| 137 | { |
| 138 | struct input_mt_slot *oldest = NULL; |
| 139 | int oldid = dev->trkid; |
| 140 | int count = 0; |
| 141 | int i; |
| 142 | |
| 143 | for (i = 0; i < dev->mtsize; ++i) { |
| 144 | struct input_mt_slot *ps = &dev->mt[i]; |
| 145 | int id = input_mt_get_value(ps, ABS_MT_TRACKING_ID); |
| 146 | |
| 147 | if (id < 0) |
| 148 | continue; |
| 149 | if ((id - oldid) & TRKID_SGN) { |
| 150 | oldest = ps; |
| 151 | oldid = id; |
| 152 | } |
| 153 | count++; |
| 154 | } |
| 155 | |
| 156 | input_event(dev, EV_KEY, BTN_TOUCH, count > 0); |
| 157 | if (use_count) |
| 158 | input_mt_report_finger_count(dev, count); |
| 159 | |
| 160 | if (oldest) { |
| 161 | int x = input_mt_get_value(oldest, ABS_MT_POSITION_X); |
| 162 | int y = input_mt_get_value(oldest, ABS_MT_POSITION_Y); |
| 163 | int p = input_mt_get_value(oldest, ABS_MT_PRESSURE); |
| 164 | |
| 165 | input_event(dev, EV_ABS, ABS_X, x); |
| 166 | input_event(dev, EV_ABS, ABS_Y, y); |
| 167 | input_event(dev, EV_ABS, ABS_PRESSURE, p); |
| 168 | } else { |
| 169 | input_event(dev, EV_ABS, ABS_PRESSURE, 0); |
| 170 | } |
| 171 | } |
| 172 | EXPORT_SYMBOL(input_mt_report_pointer_emulation); |
| 173 |
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