1 /*- 2 * Copyright (c) 2014 Jakub Wojciech Klama <jceel@FreeBSD.org> 3 * Copyright (c) 2015-2016 Vladimir Kondratyev <wulf@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #ifndef _DEV_EVDEV_EVDEV_PRIVATE_H 29 #define _DEV_EVDEV_EVDEV_PRIVATE_H 30 31 #include <sys/bitstring.h> 32 #include <sys/ck.h> 33 #include <sys/epoch.h> 34 #include <sys/kbio.h> 35 #include <sys/lock.h> 36 #include <sys/malloc.h> 37 #include <sys/mutex.h> 38 #include <sys/queue.h> 39 #include <sys/selinfo.h> 40 #include <sys/sx.h> 41 #include <sys/sysctl.h> 42 43 #include <dev/evdev/evdev.h> 44 #include <dev/evdev/input.h> 45 #include <dev/kbd/kbdreg.h> 46 47 #define NAMELEN 80 48 49 /* 50 * bitstr_t implementation must be identical to one found in EVIOCG* 51 * libevdev ioctls. Our bitstring(3) API is compatible since r299090. 52 */ 53 _Static_assert(sizeof(bitstr_t) == sizeof(unsigned long), 54 "bitstr_t size mismatch"); 55 56 MALLOC_DECLARE(M_EVDEV); 57 58 struct evdev_client; 59 struct evdev_mt; 60 61 #define CURRENT_MT_SLOT(evdev) ((evdev)->ev_absinfo[ABS_MT_SLOT].value) 62 #define MAXIMAL_MT_SLOT(evdev) ((evdev)->ev_absinfo[ABS_MT_SLOT].maximum) 63 64 enum evdev_key_events 65 { 66 KEY_EVENT_UP, 67 KEY_EVENT_DOWN, 68 KEY_EVENT_REPEAT 69 }; 70 71 /* evdev clock IDs in Linux semantic */ 72 enum evdev_clock_id 73 { 74 EV_CLOCK_REALTIME = 0, /* UTC clock */ 75 EV_CLOCK_MONOTONIC, /* monotonic, stops on suspend */ 76 EV_CLOCK_BOOTTIME /* monotonic, suspend-awared */ 77 }; 78 79 /* 80 * Locking. 81 * 82 * Internal evdev structures are protected with next locks: 83 * State lock (s) - Internal state. The data it protects is changed 84 * by incoming evdev events and some ioctls. 85 * Client list epoch (l) - Read access to client list. 86 * Client list lock (l) - Write access to client list. 87 * Client queue locks (q) - One lock per client to serialize access to data 88 * available through character device node. 89 * 90 * Depending on evdev_register_() suffix evdev can run in following modes: 91 * 1. Internal epoch. evdev_register(). All locks are internal. 92 * 2. External epoch. Evdev expects to be run under input epoch entered by 93 * parent driver. The mode is enabled with EVDEV_FLAG_EXT_EPOCH flag. 94 * 3. External mutex. evdev_register_mtx(). Evdev uses mutex provided by parent 95 * driver as both "State lock" and "Client list lock". This mode is 96 * deprecated as it causes ev_open and ev_close handlers to be called with 97 * parent driver mutex taken. 98 */ 99 #define INPUT_EPOCH global_epoch_preempt 100 101 enum evdev_lock_type 102 { 103 EV_LOCK_INTERNAL = 0, /* Internal epoch */ 104 EV_LOCK_MTX, /* Driver`s mutex */ 105 EV_LOCK_EXT_EPOCH, /* External epoch */ 106 }; 107 108 struct evdev_dev 109 { 110 char ev_name[NAMELEN]; 111 char ev_shortname[NAMELEN]; 112 char ev_serial[NAMELEN]; 113 struct cdev * ev_cdev; 114 uid_t ev_cdev_uid; 115 gid_t ev_cdev_gid; 116 int ev_cdev_mode; 117 int ev_unit; 118 enum evdev_lock_type ev_lock_type; 119 struct mtx * ev_state_lock; /* State lock */ 120 struct mtx ev_mtx; /* Internal state lock */ 121 struct sx ev_list_lock; /* Client list lock */ 122 struct input_id ev_id; 123 struct evdev_client * ev_grabber; /* (s) */ 124 size_t ev_report_size; 125 126 /* Supported features: */ 127 bitstr_t bit_decl(ev_prop_flags, INPUT_PROP_CNT); 128 bitstr_t bit_decl(ev_type_flags, EV_CNT); 129 bitstr_t bit_decl(ev_key_flags, KEY_CNT); 130 bitstr_t bit_decl(ev_rel_flags, REL_CNT); 131 bitstr_t bit_decl(ev_abs_flags, ABS_CNT); 132 bitstr_t bit_decl(ev_msc_flags, MSC_CNT); 133 bitstr_t bit_decl(ev_led_flags, LED_CNT); 134 bitstr_t bit_decl(ev_snd_flags, SND_CNT); 135 bitstr_t bit_decl(ev_sw_flags, SW_CNT); 136 struct input_absinfo * ev_absinfo; /* (s) */ 137 bitstr_t bit_decl(ev_flags, EVDEV_FLAG_CNT); 138 139 /* Repeat parameters & callout: */ 140 int ev_rep[REP_CNT]; /* (s) */ 141 struct callout ev_rep_callout; /* (s) */ 142 uint16_t ev_rep_key; /* (s) */ 143 144 /* State: */ 145 bitstr_t bit_decl(ev_key_states, KEY_CNT); /* (s) */ 146 bitstr_t bit_decl(ev_led_states, LED_CNT); /* (s) */ 147 bitstr_t bit_decl(ev_snd_states, SND_CNT); /* (s) */ 148 bitstr_t bit_decl(ev_sw_states, SW_CNT); /* (s) */ 149 bool ev_report_opened; /* (s) */ 150 151 /* KDB state: */ 152 bool ev_kdb_active; 153 bitstr_t bit_decl(ev_kdb_led_states, LED_CNT); 154 155 /* Multitouch protocol type B state: */ 156 struct evdev_mt * ev_mt; /* (s) */ 157 158 /* Counters: */ 159 uint64_t ev_event_count; /* (s) */ 160 uint64_t ev_report_count; /* (s) */ 161 162 /* Parent driver callbacks: */ 163 const struct evdev_methods * ev_methods; 164 void * ev_softc; 165 166 /* Sysctl: */ 167 struct sysctl_ctx_list ev_sysctl_ctx; 168 169 LIST_ENTRY(evdev_dev) ev_link; 170 CK_SLIST_HEAD(, evdev_client) ev_clients; /* (l) */ 171 }; 172 173 #define SYSTEM_CONSOLE_LOCK &Giant 174 175 #define EVDEV_LOCK(evdev) mtx_lock((evdev)->ev_state_lock) 176 #define EVDEV_UNLOCK(evdev) mtx_unlock((evdev)->ev_state_lock) 177 #define EVDEV_LOCK_ASSERT(evdev) do { \ 178 if ((evdev)->ev_state_lock != SYSTEM_CONSOLE_LOCK) \ 179 mtx_assert((evdev)->ev_state_lock, MA_OWNED); \ 180 } while (0) 181 #define EVDEV_ENTER(evdev) do { \ 182 if ((evdev)->ev_lock_type != EV_LOCK_MTX) \ 183 EVDEV_LOCK(evdev); \ 184 else \ 185 EVDEV_LOCK_ASSERT(evdev); \ 186 } while (0) 187 #define EVDEV_EXIT(evdev) do { \ 188 if ((evdev)->ev_lock_type != EV_LOCK_MTX) \ 189 EVDEV_UNLOCK(evdev); \ 190 } while (0) 191 192 #define EVDEV_LIST_LOCK(evdev) do { \ 193 if ((evdev)->ev_lock_type == EV_LOCK_MTX) \ 194 EVDEV_LOCK(evdev); \ 195 else \ 196 sx_xlock(&(evdev)->ev_list_lock); \ 197 } while (0) 198 #define EVDEV_LIST_UNLOCK(evdev) do { \ 199 if ((evdev)->ev_lock_type == EV_LOCK_MTX) \ 200 EVDEV_UNLOCK(evdev); \ 201 else \ 202 sx_unlock(&(evdev)->ev_list_lock); \ 203 } while (0) 204 #define EVDEV_LIST_LOCK_ASSERT(evdev) do { \ 205 if ((evdev)->ev_lock_type == EV_LOCK_MTX) \ 206 EVDEV_LOCK_ASSERT(evdev); \ 207 else \ 208 sx_assert(&(evdev)->ev_list_lock, MA_OWNED); \ 209 } while (0) 210 static inline int 211 EVDEV_LIST_LOCK_SIG(struct evdev_dev *evdev) 212 { 213 if (evdev->ev_lock_type == EV_LOCK_MTX) { 214 EVDEV_LOCK(evdev); 215 return (0); 216 } 217 return (sx_xlock_sig(&evdev->ev_list_lock)); 218 } 219 220 struct evdev_client 221 { 222 struct evdev_dev * ec_evdev; 223 struct mtx ec_buffer_mtx; /* Client queue lock */ 224 size_t ec_buffer_size; 225 size_t ec_buffer_head; /* (q) */ 226 size_t ec_buffer_tail; /* (q) */ 227 size_t ec_buffer_ready; /* (q) */ 228 enum evdev_clock_id ec_clock_id; 229 struct selinfo ec_selp; /* (q) */ 230 struct sigio * ec_sigio; 231 bool ec_async; /* (q) */ 232 bool ec_revoked; /* (l) */ 233 bool ec_blocked; /* (q) */ 234 bool ec_selected; /* (q) */ 235 236 CK_SLIST_ENTRY(evdev_client) ec_link; /* (l) */ 237 238 struct input_event ec_buffer[]; /* (q) */ 239 }; 240 241 #define EVDEV_CLIENT_LOCKQ(client) mtx_lock(&(client)->ec_buffer_mtx) 242 #define EVDEV_CLIENT_UNLOCKQ(client) mtx_unlock(&(client)->ec_buffer_mtx) 243 #define EVDEV_CLIENT_LOCKQ_ASSERT(client) \ 244 mtx_assert(&(client)->ec_buffer_mtx, MA_OWNED) 245 #define EVDEV_CLIENT_EMPTYQ(client) \ 246 ((client)->ec_buffer_head == (client)->ec_buffer_ready) 247 #define EVDEV_CLIENT_SIZEQ(client) \ 248 (((client)->ec_buffer_ready + (client)->ec_buffer_size - \ 249 (client)->ec_buffer_head) % (client)->ec_buffer_size) 250 251 /* bitstring(3) helper */ 252 static inline void 253 bit_change(bitstr_t *bitstr, int bit, int value) 254 { 255 if (value) 256 bit_set(bitstr, bit); 257 else 258 bit_clear(bitstr, bit); 259 } 260 261 /* Input device interface: */ 262 void evdev_send_event(struct evdev_dev *, uint16_t, uint16_t, int32_t); 263 int evdev_inject_event(struct evdev_dev *, uint16_t, uint16_t, int32_t); 264 int evdev_cdev_create(struct evdev_dev *); 265 int evdev_cdev_destroy(struct evdev_dev *); 266 bool evdev_event_supported(struct evdev_dev *, uint16_t); 267 void evdev_set_abs_bit(struct evdev_dev *, uint16_t); 268 void evdev_set_absinfo(struct evdev_dev *, uint16_t, struct input_absinfo *); 269 void evdev_restore_after_kdb(struct evdev_dev *); 270 271 /* Client interface: */ 272 int evdev_register_client(struct evdev_dev *, struct evdev_client *); 273 void evdev_dispose_client(struct evdev_dev *, struct evdev_client *); 274 int evdev_grab_client(struct evdev_dev *, struct evdev_client *); 275 int evdev_release_client(struct evdev_dev *, struct evdev_client *); 276 void evdev_client_push(struct evdev_client *, uint16_t, uint16_t, int32_t); 277 void evdev_notify_event(struct evdev_client *); 278 void evdev_revoke_client(struct evdev_client *); 279 280 /* Multitouch related functions: */ 281 void evdev_mt_init(struct evdev_dev *); 282 void evdev_mt_free(struct evdev_dev *); 283 void evdev_mt_sync_frame(struct evdev_dev *); 284 int evdev_mt_get_last_slot(struct evdev_dev *); 285 void evdev_mt_set_last_slot(struct evdev_dev *, int); 286 int32_t evdev_mt_get_value(struct evdev_dev *, int, int16_t); 287 void evdev_mt_set_value(struct evdev_dev *, int, int16_t, int32_t); 288 int32_t evdev_mt_reassign_id(struct evdev_dev *, int, int32_t); 289 bool evdev_mt_record_event(struct evdev_dev *, uint16_t, uint16_t, int32_t); 290 291 /* Utility functions: */ 292 void evdev_client_dumpqueue(struct evdev_client *); 293 void evdev_send_nfingers(struct evdev_dev *, int); 294 295 #endif /* _DEV_EVDEV_EVDEV_PRIVATE_H */ 296