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
87 static void sysrq_handle_loglevel(int key) in sysrq_handle_loglevel() argument
91 i = key - '0'; in sysrq_handle_loglevel()
98 .help_msg = "loglevel(0-9)",
104 static void sysrq_handle_SAK(int key) in sysrq_handle_SAK() argument
120 static void sysrq_handle_unraw(int key) in sysrq_handle_unraw() argument
135 static void sysrq_handle_crash(int key) in sysrq_handle_crash() argument
156 static void sysrq_handle_reboot(int key) in sysrq_handle_reboot() argument
169 static void sysrq_handle_sync(int key) in sysrq_handle_sync() argument
180 static void sysrq_handle_show_timers(int key) in sysrq_handle_show_timers() argument
187 .help_msg = "show-all-timers(q)",
191 static void sysrq_handle_mountro(int key) in sysrq_handle_mountro() argument
203 static void sysrq_handle_showlocks(int key) in sysrq_handle_showlocks() argument
210 .help_msg = "show-all-locks(d)",
241 static void sysrq_handle_showallcpus(int key) in sysrq_handle_showallcpus() argument
263 .help_msg = "show-backtrace-all-active-cpus(l)",
269 static void sysrq_handle_showregs(int key) in sysrq_handle_showregs() argument
281 .help_msg = "show-registers(p)",
286 static void sysrq_handle_showstate(int key) in sysrq_handle_showstate() argument
293 .help_msg = "show-task-states(t)",
298 static void sysrq_handle_showstate_blocked(int key) in sysrq_handle_showstate_blocked() argument
304 .help_msg = "show-blocked-tasks(w)",
312 static void sysrq_ftrace_dump(int key) in sysrq_ftrace_dump() argument
318 .help_msg = "dump-ftrace-buffer(z)",
326 static void sysrq_handle_showmem(int key) in sysrq_handle_showmem() argument
332 .help_msg = "show-memory-usage(m)",
346 if (p->flags & PF_KTHREAD) in send_sig_all()
356 static void sysrq_handle_term(int key) in sysrq_handle_term() argument
363 .help_msg = "terminate-all-tasks(e)",
376 .order = -1, in moom_callback()
387 static void sysrq_handle_moom(int key) in sysrq_handle_moom() argument
393 .help_msg = "memory-full-oom-kill(f)",
399 static void sysrq_handle_thaw(int key) in sysrq_handle_thaw() argument
405 .help_msg = "thaw-filesystems(j)",
411 static void sysrq_handle_kill(int key) in sysrq_handle_kill() argument
418 .help_msg = "kill-all-tasks(i)",
423 static void sysrq_handle_unrt(int key) in sysrq_handle_unrt() argument
429 .help_msg = "nice-all-RT-tasks(n)",
434 /* Key Operations table and lock */
461 NULL, /* h - reserved for help */
496 /* key2index calculation, -1 on invalid index */
497 static int sysrq_key_table_key2index(int key) in sysrq_key_table_key2index() argument
501 if ((key >= '0') && (key <= '9')) in sysrq_key_table_key2index()
502 retval = key - '0'; in sysrq_key_table_key2index()
503 else if ((key >= 'a') && (key <= 'z')) in sysrq_key_table_key2index()
504 retval = key + 10 - 'a'; in sysrq_key_table_key2index()
506 retval = -1; in sysrq_key_table_key2index()
513 struct sysrq_key_op *__sysrq_get_key_op(int key) in __sysrq_get_key_op() argument
518 i = sysrq_key_table_key2index(key); in __sysrq_get_key_op()
519 if (i != -1) in __sysrq_get_key_op()
525 static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p) in __sysrq_put_key_op() argument
527 int i = sysrq_key_table_key2index(key); in __sysrq_put_key_op()
529 if (i != -1) in __sysrq_put_key_op()
533 void __handle_sysrq(int key, bool check_mask) in __handle_sysrq() argument
550 op_p = __sysrq_get_key_op(key); in __handle_sysrq()
553 * Should we check for enabled operations (/proc/sysrq-trigger in __handle_sysrq()
556 if (!check_mask || sysrq_on_mask(op_p->enable_mask)) { in __handle_sysrq()
557 pr_info("%s\n", op_p->action_msg); in __handle_sysrq()
559 op_p->handler(key); in __handle_sysrq()
576 pr_cont("%s ", sysrq_key_table[i]->help_msg); in __handle_sysrq()
586 void handle_sysrq(int key) in handle_sysrq() argument
589 __handle_sysrq(key, true); in handle_sysrq()
598 "\000\0331234567890-=\177\t" /* 0x00 - 0x0f */
599 "qwertyuiop[]\r\000as" /* 0x10 - 0x1f */
600 "dfghjkl;'`\000\\zxcv" /* 0x20 - 0x2f */
601 "bnm,./\000*\000 \000\201\202\203\204\205" /* 0x30 - 0x3f */
602 "\206\207\210\211\212\000\000789-456+1" /* 0x40 - 0x4f */
603 "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
604 "\r\000/"; /* 0x60 - 0x6f */
634 unsigned short key; in sysrq_parse_reset_sequence() local
636 state->reset_seq_cnt = 0; in sysrq_parse_reset_sequence()
639 key = sysrq_reset_seq[i]; in sysrq_parse_reset_sequence()
641 if (key == KEY_RESERVED || key > KEY_MAX) in sysrq_parse_reset_sequence()
644 __set_bit(key, state->reset_keybit); in sysrq_parse_reset_sequence()
645 state->reset_seq_len++; in sysrq_parse_reset_sequence()
647 if (test_bit(key, state->key_down)) in sysrq_parse_reset_sequence()
648 state->reset_seq_cnt++; in sysrq_parse_reset_sequence()
652 state->reset_canceled = state->reset_seq_cnt != 0; in sysrq_parse_reset_sequence()
654 state->reset_seq_version = sysrq_reset_seq_version; in sysrq_parse_reset_sequence()
661 state->reset_requested = true; in sysrq_do_reset()
669 if (state->reset_requested) in sysrq_handle_reset_request()
673 mod_timer(&state->keyreset_timer, in sysrq_handle_reset_request()
676 sysrq_do_reset(&state->keyreset_timer); in sysrq_handle_reset_request()
680 unsigned int code, int value) in sysrq_detect_reset_sequence() argument
682 if (!test_bit(code, state->reset_keybit)) { in sysrq_detect_reset_sequence()
684 * Pressing any key _not_ in reset sequence cancels in sysrq_detect_reset_sequence()
689 if (value && state->reset_seq_cnt) { in sysrq_detect_reset_sequence()
690 state->reset_canceled = true; in sysrq_detect_reset_sequence()
691 del_timer(&state->keyreset_timer); in sysrq_detect_reset_sequence()
695 * Key release - all keys in the reset sequence need in sysrq_detect_reset_sequence()
699 del_timer(&state->keyreset_timer); in sysrq_detect_reset_sequence()
701 if (--state->reset_seq_cnt == 0) in sysrq_detect_reset_sequence()
702 state->reset_canceled = false; in sysrq_detect_reset_sequence()
704 /* key press, not autorepeat */ in sysrq_detect_reset_sequence()
705 if (++state->reset_seq_cnt == state->reset_seq_len && in sysrq_detect_reset_sequence()
706 !state->reset_canceled) { in sysrq_detect_reset_sequence()
715 u32 key; in sysrq_of_get_keyreset_config() local
720 np = of_find_node_by_path("/chosen/linux,sysrq-reset-seq"); in sysrq_of_get_keyreset_config()
729 of_property_for_each_u32(np, "keyset", prop, p, key) { in sysrq_of_get_keyreset_config()
730 if (key == KEY_RESERVED || key > KEY_MAX || in sysrq_of_get_keyreset_config()
734 sysrq_reset_seq[sysrq_reset_seq_len++] = (unsigned short)key; in sysrq_of_get_keyreset_config()
738 of_property_read_u32(np, "timeout-ms", &sysrq_reset_downtime_ms); in sysrq_of_get_keyreset_config()
750 struct input_handle *handle = &sysrq->handle; in sysrq_reinject_alt_sysrq()
751 unsigned int alt_code = sysrq->alt_use; in sysrq_reinject_alt_sysrq()
753 if (sysrq->need_reinject) { in sysrq_reinject_alt_sysrq()
755 sysrq->reinjecting = true; in sysrq_reinject_alt_sysrq()
768 sysrq->reinjecting = false; in sysrq_reinject_alt_sysrq()
773 unsigned int code, int value) in sysrq_handle_keypress() argument
775 bool was_active = sysrq->active; in sysrq_handle_keypress()
778 switch (code) { in sysrq_handle_keypress()
784 if (sysrq->active && code == sysrq->alt_use) in sysrq_handle_keypress()
785 sysrq->active = false; in sysrq_handle_keypress()
787 sysrq->alt = KEY_RESERVED; in sysrq_handle_keypress()
790 sysrq->alt = code; in sysrq_handle_keypress()
791 sysrq->need_reinject = false; in sysrq_handle_keypress()
796 if (value == 1 && sysrq->alt != KEY_RESERVED) { in sysrq_handle_keypress()
797 sysrq->active = true; in sysrq_handle_keypress()
798 sysrq->alt_use = sysrq->alt; in sysrq_handle_keypress()
801 * to re-inject Alt-SysRq keysroke. in sysrq_handle_keypress()
803 sysrq->need_reinject = true; in sysrq_handle_keypress()
810 * do not clear key bit it KGDB will end up sending in sysrq_handle_keypress()
814 if (sysrq->active) in sysrq_handle_keypress()
815 clear_bit(KEY_SYSRQ, sysrq->handle.dev->key); in sysrq_handle_keypress()
820 if (sysrq->active && value && value != 2) { in sysrq_handle_keypress()
821 sysrq->need_reinject = false; in sysrq_handle_keypress()
822 __handle_sysrq(sysrq_xlate[code], true); in sysrq_handle_keypress()
827 suppress = sysrq->active; in sysrq_handle_keypress()
829 if (!sysrq->active) { in sysrq_handle_keypress()
834 if (sysrq->reset_seq_version != sysrq_reset_seq_version) in sysrq_handle_keypress()
838 * If we are not suppressing key presses keep track of in sysrq_handle_keypress()
843 set_bit(code, sysrq->key_down); in sysrq_handle_keypress()
845 clear_bit(code, sysrq->key_down); in sysrq_handle_keypress()
848 schedule_work(&sysrq->reinject_work); in sysrq_handle_keypress()
851 sysrq_detect_reset_sequence(sysrq, code, value); in sysrq_handle_keypress()
853 } else if (value == 0 && test_and_clear_bit(code, sysrq->key_down)) { in sysrq_handle_keypress()
865 unsigned int type, unsigned int code, int value) in sysrq_filter() argument
867 struct sysrq_state *sysrq = handle->private; in sysrq_filter()
871 * Do not filter anything if we are in the process of re-injecting in sysrq_filter()
874 if (sysrq->reinjecting) in sysrq_filter()
884 suppress = sysrq_handle_keypress(sysrq, code, value); in sysrq_filter()
888 suppress = sysrq->active; in sysrq_filter()
904 return -ENOMEM; in sysrq_connect()
906 INIT_WORK(&sysrq->reinject_work, sysrq_reinject_alt_sysrq); in sysrq_connect()
908 sysrq->handle.dev = dev; in sysrq_connect()
909 sysrq->handle.handler = handler; in sysrq_connect()
910 sysrq->handle.name = "sysrq"; in sysrq_connect()
911 sysrq->handle.private = sysrq; in sysrq_connect()
912 timer_setup(&sysrq->keyreset_timer, sysrq_do_reset, 0); in sysrq_connect()
914 error = input_register_handle(&sysrq->handle); in sysrq_connect()
921 error = input_open_device(&sysrq->handle); in sysrq_connect()
930 input_unregister_handle(&sysrq->handle); in sysrq_connect()
938 struct sysrq_state *sysrq = handle->private; in sysrq_disconnect()
941 cancel_work_sync(&sysrq->reinject_work); in sysrq_disconnect()
942 del_timer_sync(&sysrq->keyreset_timer); in sysrq_disconnect()
949 * keyboards have SysRq key predefined and so user may add it to keymap
1004 return -EINVAL; in sysrq_reset_seq_param_set()
1006 *((unsigned short *)kp->arg) = val; in sysrq_reset_seq_param_set()
1057 static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p, in __sysrq_swap_key_ops() argument
1063 if (__sysrq_get_key_op(key) == remove_op_p) { in __sysrq_swap_key_ops()
1064 __sysrq_put_key_op(key, insert_op_p); in __sysrq_swap_key_ops()
1067 retval = -1; in __sysrq_swap_key_ops()
1073 * Wait for it to go away before returning, so the code for an old in __sysrq_swap_key_ops()
1081 int register_sysrq_key(int key, struct sysrq_key_op *op_p) in register_sysrq_key() argument
1083 return __sysrq_swap_key_ops(key, op_p, NULL); in register_sysrq_key()
1087 int unregister_sysrq_key(int key, struct sysrq_key_op *op_p) in unregister_sysrq_key() argument
1089 return __sysrq_swap_key_ops(key, NULL, op_p); in unregister_sysrq_key()
1095 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
1104 return -EFAULT; in write_sysrq_trigger()
1118 if (!proc_create("sysrq-trigger", S_IWUSR, NULL, in sysrq_init_procfs()