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Date: Tue, 18 Feb 2003 14:50:38 +0100
From: Tomas Szepe <szepe@pinerecords.com>
To: torvalds@transmeta.com
Cc: alan@lxorguk.ukuu.org.uk, linux-kernel@vger.kernel.org
Subject: [PATCH] morse code panics for 2.5.62
Message-ID: <20030218135038.GA1048@louise.pinerecords.com>
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Hi Linus, Alan,

Morse code panics for 2.5.62:

o  Completely arch-independent.
o  No longer touches atkbd (as suggested by Vojtech Pavlik).
o  With minimal changes to existing code.
o  Introducing morse code ops -- a good hack value (MOST IMPORTANT!!).
o  Useful to people who spend most of their time in X.

Please review,
-- 
Tomas Szepe <szepe@pinerecords.com>


diff -urN a/drivers/char/keyboard.c b/drivers/char/keyboard.c
--- a/drivers/char/keyboard.c	2003-02-15 10:20:06.000000000 +0100
+++ b/drivers/char/keyboard.c	2003-02-15 10:21:35.000000000 +0100
@@ -260,6 +260,27 @@
 }
 
 /*
+ * Turn all possible leds on or off.
+ */
+void kd_turn_all_leds(int on_or_off)
+{
+	struct list_head *node;
+	on_or_off = on_or_off ? 1 : 0;
+
+	list_for_each(node, &kbd_handler.h_list) {
+		struct input_handle *handle = to_handle_h(node);
+		if (test_bit(EV_LED, handle->dev->evbit)) {
+			int led;
+			for (led = 0; led <= LED_MAX; led++) {
+				if (test_bit(led, handle->dev->ledbit))
+					input_event(handle->dev, EV_LED, led,
+						on_or_off);
+			}
+		}
+	}
+}
+
+/*
  * Setting the keyboard rate.
  */
 static inline unsigned int ms_to_jiffies(unsigned int ms) {
diff -urN a/include/linux/morseops.h b/include/linux/morseops.h
--- a/include/linux/morseops.h	1970-01-01 01:00:00.000000000 +0100
+++ b/include/linux/morseops.h	2003-02-15 10:21:35.000000000 +0100
@@ -0,0 +1,26 @@
+/* Yes, it's morse code ops indeed. */
+
+#ifndef _LINUX_MORSEOPS_H
+#define _LINUX_MORSEOPS_H
+
+#include <linux/config.h>
+
+#if defined(CONFIG_MORSE_PANICS)
+
+extern const unsigned char morsetable[];	/* in kernel/morse.c */
+void panic_morseblink(char *buf);		/* in kernel/morse.c */
+
+static inline unsigned char tomorse(char c) {
+	if (c >= 'a' && c <= 'z')
+		c = c - 'a' + 'A';
+	if (c >= '"' && c <= '_') {
+		return morsetable[c - '"'];
+	} else
+		return 0;
+}
+
+#else	/* CONFIG_MORSE_PANICS */
+ #define panic_morseblink(buf)
+#endif	/* CONFIG_MORSE_PANICS */
+
+#endif	/* _LINUX_MORSEOPS_H */
diff -urN a/include/linux/vt_kern.h b/include/linux/vt_kern.h
--- a/include/linux/vt_kern.h	2002-12-16 07:01:55.000000000 +0100
+++ b/include/linux/vt_kern.h	2003-02-15 10:21:35.000000000 +0100
@@ -33,7 +33,10 @@
 	wait_queue_head_t paste_wait;
 } *vt_cons[MAX_NR_CONSOLES];
 
+/* keyboard.c */
+
 extern void kd_mksound(unsigned int hz, unsigned int ticks);
+extern void kd_turn_all_leds(int on_or_off);
 extern int kbd_rate(struct kbd_repeat *rep);
 
 /* console.c */
diff -urN a/init/Kconfig b/init/Kconfig
--- a/init/Kconfig	2003-02-11 01:09:48.000000000 +0100
+++ b/init/Kconfig	2003-02-15 10:21:35.000000000 +0100
@@ -98,6 +98,21 @@
 		     13 =>  8 KB
 		     12 =>  4 KB
 
+config MORSE_PANICS
+	bool "Morse code panics"
+	depends on VT
+	help
+	  When enabled, this code will make a panicking kernel cry for
+	  help in morse code, signalling on the leds of a possibly attached
+	  keyboard and/or a bleeper.  You can enable/disable your morse
+	  output devices of choice using the "panicmorse" kernel boot
+	  parameter.  Currently, "panicmorse=0" will disable the signalling
+	  completely, "panicmorse=1" (the default) will only blink the leds,
+	  "panicmorse=2" will only beep, and "panicmorse=3" will do both.
+
+	  If unsure, say Y.  This feature is very helpful to those who
+	  spend most of their time in X.
+
 endmenu
 
 
diff -urN a/kernel/Makefile b/kernel/Makefile
--- a/kernel/Makefile	2003-02-11 01:09:48.000000000 +0100
+++ b/kernel/Makefile	2003-02-15 10:21:35.000000000 +0100
@@ -18,6 +18,7 @@
 obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
 obj-$(CONFIG_SOFTWARE_SUSPEND) += suspend.o
 obj-$(CONFIG_COMPAT) += compat.o
+obj-$(CONFIG_MORSE_PANICS) += morse.o
 
 ifneq ($(CONFIG_IA64),y)
 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
diff -urN a/kernel/morse.c b/kernel/morse.c
--- a/kernel/morse.c	1970-01-01 01:00:00.000000000 +0100
+++ b/kernel/morse.c	2003-02-15 10:21:35.000000000 +0100
@@ -0,0 +1,125 @@
+/*
+ *  kernel/morse.c
+ *
+ *  Copyright (C) 2002 Andrew Rodland <arodland@noln.com>
+ *  Copyright (C) 2003 Tomas Szepe <szepe@pinerecords.com>
+ *
+ *  Tell the user who may be running in X and not see the console that
+ *  we have panic'd.  This is to distingush panics from "real lockups."
+ *  Could in theory send the panic message as morse, but that is left
+ *  as an exercise for the reader.
+ *
+ *  And now it's done! LED and speaker morse code by Andrew Rodland
+ *  <arodland@noln.com>, with improvements based on suggestions from
+ *  linux@horizon.com and a host of others.
+ *
+ *  Initial 2.5 morsepanics port and cleanup by
+ *  Tomas Szepe <szepe@pinerecords.com>, January 2003.
+ */
+
+#include <linux/config.h>
+#include <linux/morseops.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/vt_kern.h>
+
+#define DITLEN		(HZ / 5)
+#define DAHLEN		(3 * DITLEN)
+#define SPACELEN	(7 * DITLEN)
+#define FREQ		844
+
+static int morse_setting = 1;
+
+const unsigned char morsetable[] = {
+	0122, 0, 0310, 0, 0, 0163,				/* "#$%&' */
+	055, 0155, 0, 0, 0163, 0141, 0152, 0051, 		/* ()*+,-./ */
+	077, 076, 074, 070, 060, 040, 041, 043, 047, 057,	/* 0-9 */
+	0107, 0125, 0, 0061, 0, 0114, 0, 			/* :;<=>?@ */
+	006, 021, 025, 011, 002, 024, 013, 020, 004,		/* A-I */
+	036, 015, 022, 007, 005, 017, 026, 033, 012,		/* J-R */
+	010, 003, 014, 030, 016, 031, 035, 023,			/* S-Z */
+	0, 0, 0, 0, 0154					/* [\]^_ */
+};
+
+void panic_morseblink(char *buf)
+{ 
+	static unsigned long next_jiffie = 0;
+	static char * bufpos = 0;
+	static unsigned char morse = 0;
+	static char state = 1;
+	
+	if (!morse_setting) 
+		return;
+
+	if (!buf)
+		buf = "Uh oh, we lost the panic msg.";
+
+	/* Waiting for something? */
+	if (bufpos && time_after(next_jiffie, jiffies))
+		return;
+
+	if (state) {	/* Coming off of a blink. */
+		if (morse_setting & 0x01)
+			kd_turn_all_leds(0);
+
+		state = 0;
+
+		if (morse > 1) {
+			/* Not done yet, just a one-dit pause. */
+			next_jiffie = jiffies + DITLEN;
+		} else {
+			/* Get a new char, figure out how much space. */
+
+			/* First time through */
+			if (!bufpos)
+				bufpos = (char *) buf;
+
+			if (!*bufpos) {
+				/* Repeating */
+				bufpos = (char *) buf;
+				next_jiffie = jiffies + SPACELEN;
+			} else {
+				/* Inter-letter space */
+				next_jiffie = jiffies + DAHLEN; 
+			}
+
+			if (!(morse = tomorse(*bufpos))) {
+				next_jiffie = jiffies + SPACELEN;
+				state = 1;	/* And get us back here */
+			}
+			bufpos++;
+		}
+	} else {
+		/* Starting a new blink.  We have a valid code in morse. */
+		int len;
+
+		len = (morse & 001) ? DAHLEN : DITLEN;
+
+		if (morse_setting & 0x02)
+			kd_mksound(FREQ, len);
+
+		next_jiffie = jiffies + len;
+
+		if (morse_setting & 0x01)
+			kd_turn_all_leds(1);
+
+		state = 1;
+		morse >>= 1;
+	}
+}
+
+static int __init panicmorse_setup(char *str)
+{
+	int par;
+	if (get_option(&str, &par)) 
+		morse_setting = par;
+	return 1;
+}
+
+/*  "panicmorse=0" disables the blinking as it caused problems with
+ *  certain console switches.
+ *
+ *  "panicmorse | 1" does the show using kbd leds.
+ *  "panicmorse | 2" throws in bleeping via kd_mksound().
+ */
+__setup("panicmorse=", panicmorse_setup);
diff -urN a/kernel/panic.c b/kernel/panic.c
--- a/kernel/panic.c	2003-01-09 14:25:40.000000000 +0100
+++ b/kernel/panic.c	2003-02-15 10:21:35.000000000 +0100
@@ -16,6 +16,7 @@
 #include <linux/init.h>
 #include <linux/sysrq.h>
 #include <linux/interrupt.h>
+#include <linux/morseops.h>
 
 asmlinkage void sys_sync(void);	/* it's really int */
 
@@ -95,7 +96,8 @@
         disabled_wait(caller);
 #endif
 	local_irq_enable();
-	for(;;) {
+	for (;;) {
+		panic_morseblink(buf);
 		CHECK_EMERGENCY_SYNC
 	}
 }
-
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