1 /*- 2 * Copyright (c) 2016 Vladimir Kondratyev <wulf@cicgroup.ru> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/malloc.h> 31 #include <sys/lock.h> 32 #include <sys/mutex.h> 33 #include <sys/systm.h> 34 35 #include <dev/evdev/input.h> 36 #include <dev/evdev/evdev.h> 37 #include <dev/evdev/evdev_private.h> 38 39 #ifdef DEBUG 40 #define debugf(fmt, args...) printf("evdev: " fmt "\n", ##args) 41 #else 42 #define debugf(fmt, args...) 43 #endif 44 45 static uint16_t evdev_fngmap[] = { 46 BTN_TOOL_FINGER, 47 BTN_TOOL_DOUBLETAP, 48 BTN_TOOL_TRIPLETAP, 49 BTN_TOOL_QUADTAP, 50 BTN_TOOL_QUINTTAP, 51 }; 52 53 static uint16_t evdev_mtstmap[][2] = { 54 { ABS_MT_POSITION_X, ABS_X }, 55 { ABS_MT_POSITION_Y, ABS_Y }, 56 { ABS_MT_PRESSURE, ABS_PRESSURE }, 57 { ABS_MT_TOUCH_MAJOR, ABS_TOOL_WIDTH }, 58 }; 59 60 struct evdev_mt_slot { 61 uint64_t ev_report; 62 int32_t ev_mt_states[MT_CNT]; 63 }; 64 65 struct evdev_mt { 66 int32_t ev_mt_last_reported_slot; 67 struct evdev_mt_slot ev_mt_slots[]; 68 }; 69 70 void 71 evdev_mt_init(struct evdev_dev *evdev) 72 { 73 int32_t slot, slots; 74 75 slots = MAXIMAL_MT_SLOT(evdev) + 1; 76 77 evdev->ev_mt = malloc(offsetof(struct evdev_mt, ev_mt_slots) + 78 sizeof(struct evdev_mt_slot) * slots, M_EVDEV, M_WAITOK | M_ZERO); 79 80 /* Initialize multitouch protocol type B states */ 81 for (slot = 0; slot < slots; slot++) { 82 /* 83 * .ev_report should not be initialized to initial value of 84 * report counter (0) as it brokes free slot detection in 85 * evdev_get_mt_slot_by_tracking_id. So initialize it to -1 86 */ 87 evdev->ev_mt->ev_mt_slots[slot] = (struct evdev_mt_slot) { 88 .ev_report = 0xFFFFFFFFFFFFFFFFULL, 89 .ev_mt_states[ABS_MT_INDEX(ABS_MT_TRACKING_ID)] = -1, 90 }; 91 } 92 93 if (bit_test(evdev->ev_flags, EVDEV_FLAG_MT_STCOMPAT)) 94 evdev_support_mt_compat(evdev); 95 } 96 97 void 98 evdev_mt_free(struct evdev_dev *evdev) 99 { 100 101 free(evdev->ev_mt, M_EVDEV); 102 } 103 104 int32_t 105 evdev_get_last_mt_slot(struct evdev_dev *evdev) 106 { 107 108 return (evdev->ev_mt->ev_mt_last_reported_slot); 109 } 110 111 void 112 evdev_set_last_mt_slot(struct evdev_dev *evdev, int32_t slot) 113 { 114 115 evdev->ev_mt->ev_mt_last_reported_slot = slot; 116 } 117 118 inline int32_t 119 evdev_get_mt_value(struct evdev_dev *evdev, int32_t slot, int16_t code) 120 { 121 122 return (evdev->ev_mt-> 123 ev_mt_slots[slot].ev_mt_states[ABS_MT_INDEX(code)]); 124 } 125 126 inline void 127 evdev_set_mt_value(struct evdev_dev *evdev, int32_t slot, int16_t code, 128 int32_t value) 129 { 130 131 if (code == ABS_MT_TRACKING_ID && value == -1) 132 evdev->ev_mt->ev_mt_slots[slot].ev_report = 133 evdev->ev_report_count; 134 135 evdev->ev_mt->ev_mt_slots[slot].ev_mt_states[ABS_MT_INDEX(code)] = 136 value; 137 } 138 139 int32_t 140 evdev_get_mt_slot_by_tracking_id(struct evdev_dev *evdev, int32_t tracking_id) 141 { 142 int32_t tr_id, slot, free_slot = -1; 143 144 for (slot = 0; slot <= MAXIMAL_MT_SLOT(evdev); slot++) { 145 tr_id = evdev_get_mt_value(evdev, slot, ABS_MT_TRACKING_ID); 146 if (tr_id == tracking_id) 147 return (slot); 148 /* 149 * Its possible that slot will be reassigned in a place of just 150 * released one within the same report. To avoid this compare 151 * report counter with slot`s report number updated with each 152 * ABS_MT_TRACKING_ID change. 153 */ 154 if (free_slot == -1 && tr_id == -1 && 155 evdev->ev_mt->ev_mt_slots[slot].ev_report != 156 evdev->ev_report_count) 157 free_slot = slot; 158 } 159 160 return (free_slot); 161 } 162 163 void 164 evdev_support_nfingers(struct evdev_dev *evdev, int32_t nfingers) 165 { 166 int32_t i; 167 168 for (i = 0; i < MIN(nitems(evdev_fngmap), nfingers); i++) 169 evdev_support_key(evdev, evdev_fngmap[i]); 170 } 171 172 void 173 evdev_support_mt_compat(struct evdev_dev *evdev) 174 { 175 int32_t i; 176 177 if (evdev->ev_absinfo == NULL) 178 return; 179 180 evdev_support_event(evdev, EV_KEY); 181 evdev_support_key(evdev, BTN_TOUCH); 182 183 /* Touchscreens should not advertise tap tool capabilities */ 184 if (!bit_test(evdev->ev_prop_flags, INPUT_PROP_DIRECT)) 185 evdev_support_nfingers(evdev, MAXIMAL_MT_SLOT(evdev) + 1); 186 187 /* Echo 0-th MT-slot as ST-slot */ 188 for (i = 0; i < nitems(evdev_mtstmap); i++) 189 if (bit_test(evdev->ev_abs_flags, evdev_mtstmap[i][0])) 190 evdev_support_abs(evdev, evdev_mtstmap[i][1], 191 evdev->ev_absinfo[evdev_mtstmap[i][0]].value, 192 evdev->ev_absinfo[evdev_mtstmap[i][0]].minimum, 193 evdev->ev_absinfo[evdev_mtstmap[i][0]].maximum, 194 evdev->ev_absinfo[evdev_mtstmap[i][0]].fuzz, 195 evdev->ev_absinfo[evdev_mtstmap[i][0]].flat, 196 evdev->ev_absinfo[evdev_mtstmap[i][0]].resolution); 197 } 198 199 static int32_t 200 evdev_count_fingers(struct evdev_dev *evdev) 201 { 202 int32_t nfingers = 0, i; 203 204 for (i = 0; i <= MAXIMAL_MT_SLOT(evdev); i++) 205 if (evdev_get_mt_value(evdev, i, ABS_MT_TRACKING_ID) != -1) 206 nfingers++; 207 208 return (nfingers); 209 } 210 211 static void 212 evdev_send_nfingers(struct evdev_dev *evdev, int32_t nfingers) 213 { 214 int32_t i; 215 216 EVDEV_LOCK_ASSERT(evdev); 217 218 if (nfingers > nitems(evdev_fngmap)) 219 nfingers = nitems(evdev_fngmap); 220 221 for (i = 0; i < nitems(evdev_fngmap); i++) 222 evdev_send_event(evdev, EV_KEY, evdev_fngmap[i], 223 nfingers == i + 1); 224 } 225 226 void 227 evdev_push_nfingers(struct evdev_dev *evdev, int32_t nfingers) 228 { 229 230 EVDEV_LOCK(evdev); 231 evdev_send_nfingers(evdev, nfingers); 232 EVDEV_UNLOCK(evdev); 233 } 234 235 void 236 evdev_send_mt_compat(struct evdev_dev *evdev) 237 { 238 int32_t nfingers, i; 239 240 EVDEV_LOCK_ASSERT(evdev); 241 242 nfingers = evdev_count_fingers(evdev); 243 evdev_send_event(evdev, EV_KEY, BTN_TOUCH, nfingers > 0); 244 245 if (evdev_get_mt_value(evdev, 0, ABS_MT_TRACKING_ID) != -1) 246 /* Echo 0-th MT-slot as ST-slot */ 247 for (i = 0; i < nitems(evdev_mtstmap); i++) 248 if (bit_test(evdev->ev_abs_flags, evdev_mtstmap[i][1])) 249 evdev_send_event(evdev, EV_ABS, 250 evdev_mtstmap[i][1], 251 evdev_get_mt_value(evdev, 0, 252 evdev_mtstmap[i][0])); 253 254 /* Touchscreens should not report tool taps */ 255 if (!bit_test(evdev->ev_prop_flags, INPUT_PROP_DIRECT)) 256 evdev_send_nfingers(evdev, nfingers); 257 258 if (nfingers == 0) 259 evdev_send_event(evdev, EV_ABS, ABS_PRESSURE, 0); 260 } 261 262 void 263 evdev_push_mt_compat(struct evdev_dev *evdev) 264 { 265 266 EVDEV_LOCK(evdev); 267 evdev_send_mt_compat(evdev); 268 EVDEV_UNLOCK(evdev); 269 } 270