Small kernel patch for Logitech iTouch

From: Mike Paul (mbp2@Lehigh.EDU)
Date: Tue Jan 29 2002 - 17:28:23 EST

The current discussion about dealing with patch integration in Linux has
reminded me of this little patch I wrote a few months back for my Logitech
iTouch cordless keyboard. It's mainly to put an end to the "unknown scancode"
messages that would appear on the console every few minutes and corrupt my
display, but while I was at it I added keycodes for the special-function
buttons on the keyboard too.

Here's the patch, and it's a pretty straightforward one. It should apply
cleanly to 2.4.17.

--- linux/drivers/char/pc_keyb.c Fri Mar 2 21:38:37 2001
+++ linux-logitech/drivers/char/pc_keyb.c Mon Oct 8 22:40:56 2001
@@ -223,22 +223,46 @@
 #define E0_MSLW 125
 #define E0_MSRW 126
 #define E0_MSTM 127
+/*
+ * Extra buttons on the Logitech Cordless iTouch
+ *
+ * Note that the Sleep button generates both a press and release event when
+ * pressed, and ignores subsequent presses until about 4 seconds after the last
+ * time it was pressed.
+ */
+/* Power-management */
+#define E0_SLEEP 112
+/* Audio controls */
+#define E0_MUTE 113
+#define E0_VOLDN 114
+#define E0_VOLUP 115
+#define E0_PLAY 116
+#define E0_STOP 117
+#define E0_PREV 120
+#define E0_NEXT 121
+/* Internet keys */
+#define E0_EMAIL 122
+#define E0_SEARCH 123
+#define E0_RUN 124
+#define E0_HOMEPG 125
+/* Sent every few minutes for no apparent reason */
+#define E1_PING 126
 
 static unsigned char e0_keys[128] = {
   0, 0, 0, 0, 0, 0, 0, 0, /* 0x00-0x07 */
   0, 0, 0, 0, 0, 0, 0, 0, /* 0x08-0x0f */
- 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10-0x17 */
- 0, 0, 0, 0, E0_KPENTER, E0_RCTRL, 0, 0, /* 0x18-0x1f */
- 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20-0x27 */
- 0, 0, 0, 0, 0, 0, 0, 0, /* 0x28-0x2f */
- 0, 0, 0, 0, 0, E0_KPSLASH, 0, E0_PRSCR, /* 0x30-0x37 */
+ E0_PREV, 0, 0, 0, 0, 0, 0, 0, /* 0x10-0x17 */
+ E0_MUTE, E0_NEXT, 0, 0, E0_KPENTER, E0_RCTRL, 0, 0, /* 0x18-0x1f */
+ 0, 0, E0_PLAY, 0, E0_STOP, 0, 0, 0, /* 0x20-0x27 */
+ 0, 0, 0, 0, 0, 0, E0_VOLDN, 0, /* 0x28-0x2f */
+ E0_VOLUP, 0, E0_HOMEPG, 0, 0, E0_KPSLASH, 0, E0_PRSCR, /* 0x30-0x37 */
   E0_RALT, 0, 0, 0, 0, E0_F13, E0_F14, E0_HELP, /* 0x38-0x3f */
   E0_DO, E0_F17, 0, 0, 0, 0, E0_BREAK, E0_HOME, /* 0x40-0x47 */
   E0_UP, E0_PGUP, 0, E0_LEFT, E0_OK, E0_RIGHT, E0_KPMINPLUS, E0_END,/* 0x48-0x4f */
   E0_DOWN, E0_PGDN, E0_INS, E0_DEL, 0, 0, 0, 0, /* 0x50-0x57 */
- 0, 0, 0, E0_MSLW, E0_MSRW, E0_MSTM, 0, 0, /* 0x58-0x5f */
- 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60-0x67 */
- 0, 0, 0, 0, 0, 0, 0, E0_MACRO, /* 0x68-0x6f */
+ 0, 0, 0, E0_MSLW, E0_MSRW, E0_MSTM, 0, E0_SLEEP, /* 0x58-0x5f */
+ 0, 0, 0, 0, 0, E0_SEARCH, E0_RUN, 0, /* 0x60-0x67 */
+ 0, 0, 0, 0, E0_EMAIL, 0, 0, E0_MACRO, /* 0x68-0x6f */
   0, 0, 0, 0, 0, 0, 0, 0, /* 0x70-0x77 */
   0, 0, 0, 0, 0, 0, 0, 0 /* 0x78-0x7f */
 };
@@ -311,6 +335,10 @@
           /*
            * usually it will be 0xe0, but a Pause key generates
            * e1 1d 45 e1 9d c5 when pressed, and nothing when released
+ *
+ * The Logitech Cordless iTouch generates e1 5c every few minutes for
+ * no apparent reason. It might have something to do with reporting
+ * battery status, but I don't know.
            */
           if (prev_scancode != 0xe0) {
               if (prev_scancode == 0xe1 && scancode == 0x1d) {
@@ -318,6 +346,9 @@
                   return 0;
               } else if (prev_scancode == 0x100 && scancode == 0x45) {
                   *keycode = E1_PAUSE;
+ prev_scancode = 0;
+ } else if (prev_scancode == 0xe1 && scancode == 0x5c) {
+ *keycode = E1_PING;
                   prev_scancode = 0;
               } else {
 #ifdef KBD_REPORT_UNKN 

-- 

Mike Paul
mbp2@lehigh.edu
http://www.lehigh.edu/~mbp2/
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