first steps towards (optional) serial mouse support

1 files changed, 27 insertions, 12 deletions

diff --git a/mousetsr.h b/mousetsr.h
index f33dc11..704f670 100644
--- a/mousetsr.h
+++ b/mousetsr.h
@@ -38,6 +38,8 @@
 #define USE_WHEEL 1
 /** Enable Intellimouse Explorer protocol (two wheels and 5 buttons). */
 #define USE_IMEX 1
+/** Enable support for serial mouse. */
+#define USE_SERIAL 1
 /** Trace mouse events verbosily. */
 #define TRACE_EVENTS 0
 /** Trace (noisy) API calls. */
@@ -53,11 +55,14 @@
 
 #define USE_INTEGRATION (USE_VIRTUALBOX || USE_VMWARE)
 
-/** Max size of PS/2 packet that we support. */
-#define MAX_PS2_PACKET_SIZE 4
+/** Max size of PS/2/serial packet that we support. */
+#define MAX_PACKET_SIZE 4
 
-/** Maximum number of 55ms ticks that may pass between two bytes of the same PS/2 packet */
-#define MAX_PS2_PACKET_DELAY 2
+/** Maximum number of 55ms ticks that may pass between two bytes of the same packet */
+#define MAX_PACKET_DELAY 2
+
+/** Maximum COMn port. */
+#define MAX_PORTS 4
 
 /** Maximum number of buttons supported by this driver. */
 #define MAX_BUTTONS 5
@@ -97,11 +102,15 @@ enum {
 
 typedef struct tsrdata {
 	// TSR installation data
+	// Note that because of WatcomC limitations the offsets of these
+	// are hardcoded in the inline ASM, so do not change them.
 	/** Previous int33 ISR, storing it for uninstall. */
 	void (__interrupt __far *prev_int33_handler)();
-#if USE_WIN386
+	/** Previous ISR for IRQ 3 or 4, depending on the used serial port. */
+	void (__interrupt __far *prev_irq3_4_handler)();
+	/** Previous int2f ISR, may need to chain to it. */
 	void (__interrupt __far *prev_int2f_handler)();
-#endif
+
 	// Settings configured via the command line
 #if USE_WHEEL
 	/** Whether to enable & use wheel mouse. */
@@ -126,24 +135,28 @@ typedef struct tsrdata {
 	struct point screen_granularity;
 
 	// Detected mouse hardware & status
-	/** Current negotiated PS/2 device_id */
+	/** Current mouse's port. 0 = PS/2 , 1...N serial. */
+	uint8_t port;
+	/** Current negotiated PS/2 device_id (or serial mouse type) */
 	uint8_t device_id;
 	/** Number of buttons of current device. */
 	uint8_t num_buttons;
-#if USE_WHEEL
 	/** Number of wheels of current device. */
 	uint8_t num_wheels;
-#endif
-	/** Packet size that the BIOS is currently using. Either 1 (streaming) or 3 (plain). */
+	/** Packet size that the PS/2 BIOS is currently using. Either 1 (streaming) or 3 (plain). */
 	uint8_t bios_packet_size;
 	/** Packet size that we are currently expecting internally. Usually 3 (plain) or 4 (with wheel). */
 	uint8_t packet_size;
 	/** For streaming mode: number of bytes received so far (< packet_size). */
 	uint8_t cur_packet_bytes;
-	/** Stores the bytes received so far (cur_bytes). */
-	uint8_t ps2_packet[MAX_PS2_PACKET_SIZE];
+	/** Stores the bytes received so far (cur_packet_bytes). */
+	uint8_t cur_packet[MAX_PACKET_SIZE];
 	/** Number of ticks at the point when we started to receive this packet. */
 	uint16_t cur_packet_ticks;
+	/** IO base for the current port. */
+	uint16_t port_io;
+	/** IRQ for the current port. */
+	uint8_t port_irq;
 
 	// Current mouse settings
 	/** Mouse sensitivity/speed. */
@@ -255,6 +268,8 @@ typedef TSRDATA __far * LPTSRDATA;
 
 extern void __declspec(naked) __far int33_isr(void);
 
+extern void __declspec(naked) __far irq3_4_isr(void);
+
 extern void __declspec(naked) __far int2f_isr(void);
 
 extern LPTSRDATA __far get_tsr_data(bool installed);