# HG changeset patch
# User Sam Lantinga <slouken@libsdl.org>
# Date 1143012160 0
# Node ID b786d9c15e425f4f8c5444e6061e2c7bcec70dc2
# Parent  95451df282c345305729a3d1762e81931283ac2a
Fixed bug #61

Date: Mon, 24 Feb 2003 13:35:11 +0800
From: "Leonidas"
Subject: [SDL] Re: Trigger mouse wheel event -- not in X-environment

I have looked into the codes for the IMPS/2 mouse wheel mode of fbcon driver.
But I found something weird.

Here's the original codes to set a mouse device into IMPS/2 mode in libSDL.
In the file src/video/fbcon/SDL_fbevents.c
In function static int set_imps2_mode(int fd)
...
 Uint8 set_imps2[] = {0xf3, 200, 0xf3, 100, 0xf3, 80};
 Uint8 reset = 0xff;
 fd_set fdset;
 struct timeval tv;
 int retval = 0;

 // Set mouse device fd into IMPS/2 mode
 if ( write(fd, &set_imps2, sizeof(set_imps2)) == sizeof(set_imps2) ) {
  // ??? then RESET it..???
  if (write(fd, &reset, sizeof (reset)) == sizeof (reset) ) {
   retval = 1;
  }
 }
...........

Since it sets IMPS/2 mode then reset it, so you will never get a mouse into
IMPS/2 mode to use its wheel.
What I did to make the wheel usable is remove the RESET codes.
....
 if ( write(fd, &set_imps2, sizeof(set_imps2)) == sizeof(set_imps2) ) {
    /*
    if (write(fd, &reset, sizeof (reset)) == sizeof (reset) ) {
    }
   */
   retval = 1;
 }
....
And in FB_OpenMouse(_THIS)
Make the device /dev/psaux to be setted into imps2 mode  such that it can be
detected its a imps/2 mouse or not.
(my mouse device is on ps2, but the codes only set /dev/input/mice device
originally)
Then I have done, I can use the mouse wheel when SDL uses frame buff driver.

I dont exactly know I did right or wrong, I just change it for my usuage.
Correct me please, if I did something wrong.

Best regards,
Li Tsung Lin
IAP Product Dept. Engineer
EeRise Corp. (Image Processing System, Computer Vision System)
Hsin Tien, Taipei Hsien, Taiwan, R.O.C.

diff -r 95451df282c3 -r b786d9c15e42 src/video/fbcon/SDL_fbevents.c
--- a/src/video/fbcon/SDL_fbevents.c	Wed Mar 22 07:10:38 2006 +0000
+++ b/src/video/fbcon/SDL_fbevents.c	Wed Mar 22 07:22:40 2006 +0000
@@ -420,9 +420,11 @@
 	int retval = 0;
 
 	if ( write(fd, &set_imps2, sizeof(set_imps2)) == sizeof(set_imps2) ) {
+		/* Don't reset it, that'll clear IMPS/2 mode on some mice
 		if (write(fd, &reset, sizeof (reset)) == sizeof (reset) ) {
 			retval = 1;
 		}
+		*/
 	}
 
 	/* Get rid of any chatter from the above */
@@ -545,7 +547,7 @@
 
 	if ( mousedev == NULL ) {
 		/* FIXME someday... allow multiple mice in this driver */
-		static const char * const ps2mice[] = {
+		static const char *ps2mice[] = {
 		    "/dev/input/mice", "/dev/usbmouse", "/dev/psaux", NULL
 		};
 		/* First try to use GPM in repeater mode */
@@ -568,9 +570,7 @@
 			}
 			if (mouse_fd >= 0) {
 				/* rcg06112001 Attempt to set IMPS/2 mode */
-				if ( i == 0 ) {
-					set_imps2_mode(mouse_fd);
-				}
+				set_imps2_mode(mouse_fd);
 				if (detect_imps2(mouse_fd)) {
 #ifdef DEBUG_MOUSE
 fprintf(stderr, "Using IMPS2 mouse\n");