Lines Matching +full:key +full:- +full:code
1 // SPDX-License-Identifier: GPL-2.0
3 * Linux Magic System Request Key Hacks
9 * overhauled to use key registration
68 * sysrq_mask - Getter for sysrq_enabled mask.
101 static void sysrq_handle_loglevel(int key) in sysrq_handle_loglevel() argument
105 i = key - '0'; in sysrq_handle_loglevel()
112 .help_msg = "loglevel(0-9)",
118 static void sysrq_handle_SAK(int key) in sysrq_handle_SAK() argument
135 static void sysrq_handle_unraw(int key) in sysrq_handle_unraw() argument
150 static void sysrq_handle_crash(int key) in sysrq_handle_crash() argument
164 static void sysrq_handle_reboot(int key) in sysrq_handle_reboot() argument
179 static void sysrq_handle_sync(int key) in sysrq_handle_sync() argument
190 static void sysrq_handle_show_timers(int key) in sysrq_handle_show_timers() argument
197 .help_msg = "show-all-timers(q)",
201 static void sysrq_handle_mountro(int key) in sysrq_handle_mountro() argument
213 static void sysrq_handle_showlocks(int key) in sysrq_handle_showlocks() argument
220 .help_msg = "show-all-locks(d)",
251 static void sysrq_handle_showallcpus(int key) in sysrq_handle_showallcpus() argument
273 .help_msg = "show-backtrace-all-active-cpus(l)",
279 static void sysrq_handle_showregs(int key) in sysrq_handle_showregs() argument
291 .help_msg = "show-registers(p)",
296 static void sysrq_handle_showstate(int key) in sysrq_handle_showstate() argument
303 .help_msg = "show-task-states(t)",
308 static void sysrq_handle_showstate_blocked(int key) in sysrq_handle_showstate_blocked() argument
314 .help_msg = "show-blocked-tasks(w)",
322 static void sysrq_ftrace_dump(int key) in sysrq_ftrace_dump() argument
328 .help_msg = "dump-ftrace-buffer(z)",
336 static void sysrq_handle_showmem(int key) in sysrq_handle_showmem() argument
342 .help_msg = "show-memory-usage(m)",
356 if (p->flags & PF_KTHREAD) in send_sig_all()
366 static void sysrq_handle_term(int key) in sysrq_handle_term() argument
373 .help_msg = "terminate-all-tasks(e)",
386 .order = -1, in moom_callback()
397 static void sysrq_handle_moom(int key) in sysrq_handle_moom() argument
403 .help_msg = "memory-full-oom-kill(f)",
408 static void sysrq_handle_thaw(int key) in sysrq_handle_thaw() argument
414 .help_msg = "thaw-filesystems(j)",
419 static void sysrq_handle_kill(int key) in sysrq_handle_kill() argument
426 .help_msg = "kill-all-tasks(i)",
431 static void sysrq_handle_unrt(int key) in sysrq_handle_unrt() argument
437 .help_msg = "nice-all-RT-tasks(n)",
442 /* Key Operations table and lock */
469 NULL, /* h - reserved for help */
530 /* key2index calculation, -1 on invalid index */
531 static int sysrq_key_table_key2index(int key) in sysrq_key_table_key2index() argument
535 if ((key >= '0') && (key <= '9')) in sysrq_key_table_key2index()
536 retval = key - '0'; in sysrq_key_table_key2index()
537 else if ((key >= 'a') && (key <= 'z')) in sysrq_key_table_key2index()
538 retval = key + 10 - 'a'; in sysrq_key_table_key2index()
539 else if ((key >= 'A') && (key <= 'Z')) in sysrq_key_table_key2index()
540 retval = key + 36 - 'A'; in sysrq_key_table_key2index()
542 retval = -1; in sysrq_key_table_key2index()
549 static const struct sysrq_key_op *__sysrq_get_key_op(int key) in __sysrq_get_key_op() argument
554 i = sysrq_key_table_key2index(key); in __sysrq_get_key_op()
555 if (i != -1) in __sysrq_get_key_op()
561 static void __sysrq_put_key_op(int key, const struct sysrq_key_op *op_p) in __sysrq_put_key_op() argument
563 int i = sysrq_key_table_key2index(key); in __sysrq_put_key_op()
565 if (i != -1) in __sysrq_put_key_op()
569 void __handle_sysrq(int key, bool check_mask) in __handle_sysrq() argument
590 op_p = __sysrq_get_key_op(key); in __handle_sysrq()
593 * Should we check for enabled operations (/proc/sysrq-trigger in __handle_sysrq()
596 if (!check_mask || sysrq_on_mask(op_p->enable_mask)) { in __handle_sysrq()
597 pr_info("%s\n", op_p->action_msg); in __handle_sysrq()
599 op_p->handler(key); in __handle_sysrq()
616 pr_cont("%s ", sysrq_key_table[i]->help_msg); in __handle_sysrq()
628 void handle_sysrq(int key) in handle_sysrq() argument
631 __handle_sysrq(key, true); in handle_sysrq()
640 "\000\0331234567890-=\177\t" /* 0x00 - 0x0f */
641 "qwertyuiop[]\r\000as" /* 0x10 - 0x1f */
642 "dfghjkl;'`\000\\zxcv" /* 0x20 - 0x2f */
643 "bnm,./\000*\000 \000\201\202\203\204\205" /* 0x30 - 0x3f */
644 "\206\207\210\211\212\000\000789-456+1" /* 0x40 - 0x4f */
645 "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
646 "\r\000/"; /* 0x60 - 0x6f */
678 unsigned short key; in sysrq_parse_reset_sequence() local
680 state->reset_seq_cnt = 0; in sysrq_parse_reset_sequence()
683 key = sysrq_reset_seq[i]; in sysrq_parse_reset_sequence()
685 if (key == KEY_RESERVED || key > KEY_MAX) in sysrq_parse_reset_sequence()
688 __set_bit(key, state->reset_keybit); in sysrq_parse_reset_sequence()
689 state->reset_seq_len++; in sysrq_parse_reset_sequence()
691 if (test_bit(key, state->key_down)) in sysrq_parse_reset_sequence()
692 state->reset_seq_cnt++; in sysrq_parse_reset_sequence()
696 state->reset_canceled = state->reset_seq_cnt != 0; in sysrq_parse_reset_sequence()
698 state->reset_seq_version = sysrq_reset_seq_version; in sysrq_parse_reset_sequence()
705 state->reset_requested = true; in sysrq_do_reset()
712 if (state->reset_requested) in sysrq_handle_reset_request()
716 mod_timer(&state->keyreset_timer, in sysrq_handle_reset_request()
719 sysrq_do_reset(&state->keyreset_timer); in sysrq_handle_reset_request()
723 unsigned int code, int value) in sysrq_detect_reset_sequence() argument
725 if (!test_bit(code, state->reset_keybit)) { in sysrq_detect_reset_sequence()
727 * Pressing any key _not_ in reset sequence cancels in sysrq_detect_reset_sequence()
732 if (value && state->reset_seq_cnt) { in sysrq_detect_reset_sequence()
733 state->reset_canceled = true; in sysrq_detect_reset_sequence()
734 del_timer(&state->keyreset_timer); in sysrq_detect_reset_sequence()
738 * Key release - all keys in the reset sequence need in sysrq_detect_reset_sequence()
742 del_timer(&state->keyreset_timer); in sysrq_detect_reset_sequence()
744 if (--state->reset_seq_cnt == 0) in sysrq_detect_reset_sequence()
745 state->reset_canceled = false; in sysrq_detect_reset_sequence()
747 /* key press, not autorepeat */ in sysrq_detect_reset_sequence()
748 if (++state->reset_seq_cnt == state->reset_seq_len && in sysrq_detect_reset_sequence()
749 !state->reset_canceled) { in sysrq_detect_reset_sequence()
758 u32 key; in sysrq_of_get_keyreset_config() local
763 np = of_find_node_by_path("/chosen/linux,sysrq-reset-seq"); in sysrq_of_get_keyreset_config()
772 of_property_for_each_u32(np, "keyset", prop, p, key) { in sysrq_of_get_keyreset_config()
773 if (key == KEY_RESERVED || key > KEY_MAX || in sysrq_of_get_keyreset_config()
777 sysrq_reset_seq[sysrq_reset_seq_len++] = (unsigned short)key; in sysrq_of_get_keyreset_config()
781 of_property_read_u32(np, "timeout-ms", &sysrq_reset_downtime_ms); in sysrq_of_get_keyreset_config()
795 struct input_handle *handle = &sysrq->handle; in sysrq_reinject_alt_sysrq()
796 unsigned int alt_code = sysrq->alt_use; in sysrq_reinject_alt_sysrq()
798 if (sysrq->need_reinject) { in sysrq_reinject_alt_sysrq()
800 sysrq->reinjecting = true; in sysrq_reinject_alt_sysrq()
813 sysrq->reinjecting = false; in sysrq_reinject_alt_sysrq()
818 unsigned int code, int value) in sysrq_handle_keypress() argument
820 bool was_active = sysrq->active; in sysrq_handle_keypress()
823 switch (code) { in sysrq_handle_keypress()
829 if (sysrq->active && code == sysrq->alt_use) in sysrq_handle_keypress()
830 sysrq->active = false; in sysrq_handle_keypress()
832 sysrq->alt = KEY_RESERVED; in sysrq_handle_keypress()
835 sysrq->alt = code; in sysrq_handle_keypress()
836 sysrq->need_reinject = false; in sysrq_handle_keypress()
843 sysrq->shift = KEY_RESERVED; in sysrq_handle_keypress()
845 sysrq->shift = code; in sysrq_handle_keypress()
849 if (value == 1 && sysrq->alt != KEY_RESERVED) { in sysrq_handle_keypress()
850 sysrq->active = true; in sysrq_handle_keypress()
851 sysrq->alt_use = sysrq->alt; in sysrq_handle_keypress()
852 /* either RESERVED (for released) or actual code */ in sysrq_handle_keypress()
853 sysrq->shift_use = sysrq->shift; in sysrq_handle_keypress()
856 * to re-inject Alt-SysRq keysroke. in sysrq_handle_keypress()
858 sysrq->need_reinject = true; in sysrq_handle_keypress()
865 * do not clear key bit it KGDB will end up sending in sysrq_handle_keypress()
869 if (sysrq->active) in sysrq_handle_keypress()
870 clear_bit(KEY_SYSRQ, sysrq->handle.dev->key); in sysrq_handle_keypress()
875 if (sysrq->active && value && value != 2) { in sysrq_handle_keypress()
876 unsigned char c = sysrq_xlate[code]; in sysrq_handle_keypress()
878 sysrq->need_reinject = false; in sysrq_handle_keypress()
879 if (sysrq->shift_use != KEY_RESERVED) in sysrq_handle_keypress()
886 suppress = sysrq->active; in sysrq_handle_keypress()
888 if (!sysrq->active) { in sysrq_handle_keypress()
893 if (sysrq->reset_seq_version != sysrq_reset_seq_version) in sysrq_handle_keypress()
897 * If we are not suppressing key presses keep track of in sysrq_handle_keypress()
902 set_bit(code, sysrq->key_down); in sysrq_handle_keypress()
904 clear_bit(code, sysrq->key_down); in sysrq_handle_keypress()
907 schedule_work(&sysrq->reinject_work); in sysrq_handle_keypress()
910 sysrq_detect_reset_sequence(sysrq, code, value); in sysrq_handle_keypress()
912 } else if (value == 0 && test_and_clear_bit(code, sysrq->key_down)) { in sysrq_handle_keypress()
924 unsigned int type, unsigned int code, int value) in sysrq_filter() argument
926 struct sysrq_state *sysrq = handle->private; in sysrq_filter()
930 * Do not filter anything if we are in the process of re-injecting in sysrq_filter()
933 if (sysrq->reinjecting) in sysrq_filter()
943 suppress = sysrq_handle_keypress(sysrq, code, value); in sysrq_filter()
947 suppress = sysrq->active; in sysrq_filter()
963 return -ENOMEM; in sysrq_connect()
965 INIT_WORK(&sysrq->reinject_work, sysrq_reinject_alt_sysrq); in sysrq_connect()
967 sysrq->handle.dev = dev; in sysrq_connect()
968 sysrq->handle.handler = handler; in sysrq_connect()
969 sysrq->handle.name = "sysrq"; in sysrq_connect()
970 sysrq->handle.private = sysrq; in sysrq_connect()
971 timer_setup(&sysrq->keyreset_timer, sysrq_do_reset, 0); in sysrq_connect()
973 error = input_register_handle(&sysrq->handle); in sysrq_connect()
980 error = input_open_device(&sysrq->handle); in sysrq_connect()
989 input_unregister_handle(&sysrq->handle); in sysrq_connect()
997 struct sysrq_state *sysrq = handle->private; in sysrq_disconnect()
1000 cancel_work_sync(&sysrq->reinject_work); in sysrq_disconnect()
1001 del_timer_sync(&sysrq->keyreset_timer); in sysrq_disconnect()
1008 * keyboards have SysRq key predefined and so user may add it to keymap
1056 return -EINVAL; in sysrq_reset_seq_param_set()
1058 *((unsigned short *)kp->arg) = val; in sysrq_reset_seq_param_set()
1110 static int __sysrq_swap_key_ops(int key, const struct sysrq_key_op *insert_op_p, in __sysrq_swap_key_ops() argument
1116 if (__sysrq_get_key_op(key) == remove_op_p) { in __sysrq_swap_key_ops()
1117 __sysrq_put_key_op(key, insert_op_p); in __sysrq_swap_key_ops()
1120 retval = -1; in __sysrq_swap_key_ops()
1126 * Wait for it to go away before returning, so the code for an old in __sysrq_swap_key_ops()
1134 int register_sysrq_key(int key, const struct sysrq_key_op *op_p) in register_sysrq_key() argument
1136 return __sysrq_swap_key_ops(key, op_p, NULL); in register_sysrq_key()
1140 int unregister_sysrq_key(int key, const struct sysrq_key_op *op_p) in unregister_sysrq_key() argument
1142 return __sysrq_swap_key_ops(key, NULL, op_p); in unregister_sysrq_key()
1148 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
1157 return -EFAULT; in write_sysrq_trigger()
1171 if (!proc_create("sysrq-trigger", S_IWUSR, NULL, in sysrq_init_procfs()