patch-2.1.91 linux/drivers/char/macmouse.c

• Lines: 312
• Date: Sat Mar 21 11:06:17 1998
• Orig file: v2.1.90/linux/drivers/char/macmouse.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.90/linux/drivers/char/macmouse.c linux/drivers/char/macmouse.c
@@ -0,0 +1,311 @@
+/*
+ * Macintosh ADB Mouse driver for Linux
+ *
+ * 27 Oct 1997 Michael Schmitz
+ *
+ * Apple mouse protocol according to:
+ *
+ * Device code shamelessly stolen from:
+ */
+/*
+ * Atari Mouse Driver for Linux
+ * by Robert de Vries (robert@and.nl) 19Jul93
+ *
+ * 16 Nov 1994 Andreas Schwab
+ * Compatibility with busmouse
+ * Support for three button mouse (shamelessly stolen from MiNT)
+ * third button wired to one of the joystick directions on joystick 1
+ *
+ * 1996/02/11 Andreas Schwab
+ * Module support
+ * Allow multiple open's
+ */
+
+#include <linux/module.h>
+
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/mm.h>
+#include <linux/random.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+
+#include <asm/setup.h>
+#include <asm/mac_mouse.h>
+#include <asm/segment.h>
+#include <asm/uaccess.h>
+
+static struct mouse_status mouse;
+static int mac_mouse_x_threshold = 2, mac_mouse_y_threshold = 2;
+static int mac_mouse_buttons = 0;
+
+extern void (*mac_mouse_interrupt_hook) (char *, int);
+extern int mac_emulate_button2;
+extern int mac_emulate_button3;
+
+extern int console_loglevel;
+
+/*
+ *	XXX: need to figure out what ADB mouse packets mean ... 
+ *	This is the stuff stolen from the Atari driver ...
+ */
+static void mac_mouse_interrupt(char *buf, int nb)
+{
+    static int buttons = 7;	/* all mouse buttons _up_ !! */
+
+  /*
+    Handler 1 -- 100cpi original Apple mouse protocol.
+    Handler 2 -- 200cpi original Apple mouse protocol.
+
+    For Apple's standard one-button mouse protocol the data array will
+    contain the following values:
+
+                BITS    COMMENTS
+    data[0] = 0000 0000 ADB packet identifer.
+    data[1] = ???? ???? (?)
+    data[2] = ???? ??00 Bits 0-1 should be zero for a mouse device.
+    data[3] = bxxx xxxx First button and x-axis motion.
+    data[4] = byyy yyyy Second button and y-axis motion.
+
+    NOTE: data[0] is confirmed by the parent function and need not be
+    checked here.
+  */
+
+  /*
+    Handler 4 -- Apple Extended mouse protocol.
+
+    For Apple's 3-button mouse protocol the data array will contain the
+    following values:
+
+		BITS    COMMENTS
+    data[0] = 0000 0000 ADB packet identifer.
+    data[1] = 0100 0000 Extended protocol register.
+	      Bits 6-7 are the device id, which should be 1.
+	      Bits 4-5 are resolution which is in "units/inch".
+	      The Logitech MouseMan returns these bits clear but it has
+	      200/300cpi resolution.
+	      Bits 0-3 are unique vendor id.
+    data[2] = 0011 1100 Bits 0-1 should be zero for a mouse device.
+	      Bits 2-3 should be 8 + 4.
+		      Bits 4-7 should be 3 for a mouse device.
+    data[3] = bxxx xxxx Left button and x-axis motion.
+    data[4] = byyy yyyy Second button and y-axis motion.
+    data[5] = byyy bxxx Third button and fourth button.  
+    	      Y is additiona. high bits of y-axis motion.  
+    	      X is additional high bits of x-axis motion.
+
+    NOTE: data[0] and data[2] are confirmed by the parent function and
+    need not be checked here.
+  */
+
+    /*
+     * 'buttons' here means 'button down' states!
+     * Button 1 (left)  : bit 2, busmouse button 3
+     * Button 2 (right) : bit 0, busmouse button 1
+     * Button 3 (middle): bit 1, busmouse button 2
+     */
+
+    /* x/y and buttons swapped */
+    
+    if (buf[0] ==  0)	{				/* real packet : use buttons? */
+#ifdef DEBUG_ADBMOUSE
+	if (console_loglevel >= 8)
+	    printk("mac_mouse: real data; "); 
+#endif
+	/* button 1 (left, bit 2) : always significant ! */
+	buttons = (buttons&3) | (buf[3] & 0x80 ? 4 : 0); /* 1+2 unchanged */
+	/* button 2 (right, bit 0) present ? */
+	if ( !mac_emulate_button2 ) 
+	    buttons = (buttons&6) | (buf[4] & 0x80 ? 1 : 0); /* 2+3 unchanged */
+	/* button 2 (middle) present? */
+	/* data valid only if extended mouse format ! (buf[3] = 0 else)*/
+	if ( !mac_emulate_button3 && buf[1]&0x40 )
+	    buttons = (buttons&5) | (buf[5] & 0x80 ? 2 : 0); /* 1+3 unchanged */
+    } else {					/* fake packet : use 2+3 */
+#ifdef DEBUG_ADBMOUSE
+	if (console_loglevel >= 8)
+	    printk("mac_mouse: fake data; "); 
+#endif
+	/* we only see state changes here, but the fake driver takes care
+	 * to preserve state... button 1 state must stay unchanged! */
+	buttons = (buttons&4) | ((buf[4] & 0x80 ? 1 : 0) | (buf[5] & 0x80 ? 2 : 0));
+    }
+
+    add_mouse_randomness(((~buttons & 7) << 16) + ((buf[2]&0x7f) << 8) + (buf[1]&0x7f));
+    mouse.buttons = buttons & 7;
+    mouse.dx += ((buf[4]&0x7f) < 64 ? (buf[4]&0x7f) : (buf[4]&0x7f)-128 );
+    mouse.dy -= ((buf[3]&0x7f) < 64 ? (buf[3]&0x7f) : (buf[3]&0x7f)-128 );
+
+#ifdef DEBUG_ADBMOUSE
+    if (console_loglevel >= 8)
+        printk(" %X %X %X buttons %x dx %d dy %d \n", 
+               buf[3], buf[4], buf[5], mouse.buttons, mouse.dx, mouse.dy);
+#endif
+ 
+    mouse.ready = 1;
+    wake_up_interruptible(&mouse.wait);
+    if (mouse.fasyncptr)
+	kill_fasync(mouse.fasyncptr, SIGIO);
+
+}
+
+static int fasync_mouse(struct file *filp, int on)
+{
+	int retval;
+
+	retval = fasync_helper(filp, on, &mouse.fasyncptr);
+	if (retval < 0)
+		return retval;
+	return 0;
+}
+
+static int release_mouse(struct inode *inode, struct file *file)
+{
+    fasync_mouse(file, 0);
+    if (--mouse.active)
+      return 0;
+
+    mac_mouse_interrupt_hook = NULL;
+    MOD_DEC_USE_COUNT;
+    return 0;
+}
+
+static int open_mouse(struct inode *inode, struct file *file)
+{
+    if (mouse.active++)
+	return 0;
+	
+    mouse.ready = 0;
+
+    mouse.dx = mouse.dy = 0;
+    mac_mouse_buttons = 0;
+    MOD_INC_USE_COUNT;
+    mac_mouse_interrupt_hook = mac_mouse_interrupt;
+    return 0;
+}
+
+static ssize_t write_mouse(struct file *file, const char *buffer,
+			   size_t count, loff_t *ppos)
+{
+    return -EINVAL;
+}
+
+static ssize_t read_mouse(struct file *file, char *buffer, size_t count,
+			  loff_t *ppos)
+{
+    int dx, dy, buttons;
+
+    if (count < 3)
+	return -EINVAL;
+    if (!mouse.ready)
+	return -EAGAIN;
+    dx = mouse.dx;
+    dy = mouse.dy;
+    buttons = mouse.buttons;
+    if (dx > 127)
+      dx = 127;
+    else if (dx < -128)
+      dx = -128;
+    if (dy > 127)
+      dy = 127;
+    else if (dy < -128)
+      dy = -128;
+    mouse.dx -= dx;
+    mouse.dy -= dy;
+    if (mouse.dx == 0 && mouse.dy == 0)
+      mouse.ready = 0;
+    if (put_user(buttons | 0x80, buffer++) ||
+	put_user((char) dx, buffer++) ||
+	put_user((char) dy, buffer++))
+      return -EFAULT;
+    if (count > 3)
+      if (clear_user(buffer, count - 3))
+	return -EFAULT;
+    return count;
+}
+
+static unsigned int mouse_poll(struct file *file, poll_table *wait)
+{
+	poll_wait(&mouse.wait, wait);
+	if (mouse.ready)
+		return POLLIN | POLLRDNORM;
+	return 0;
+}
+
+struct file_operations mac_mouse_fops = {
+    NULL,		/* mouse_seek */
+    read_mouse,
+    write_mouse,
+    NULL,		/* mouse_readdir */
+    mouse_poll,
+    NULL,		/* mouse_ioctl */
+    NULL,		/* mouse_mmap */
+    open_mouse,
+    release_mouse,
+    NULL,
+    fasync_mouse,
+};
+
+#define ADB_MOUSE_MINOR	10
+
+static struct miscdevice mac_mouse = {
+    ADB_MOUSE_MINOR, "adbmouse", &mac_mouse_fops
+};
+
+__initfunc(int mac_mouse_init(void))
+{
+    mouse.active = 0;
+    mouse.ready = 0;
+    mouse.wait = NULL;
+
+    if (!MACH_IS_MAC)
+	return -ENODEV;
+
+    printk(KERN_INFO "Macintosh ADB mouse installed.\n");
+    misc_register(&mac_mouse);
+    return 0;
+}
+
+
+#define	MIN_THRESHOLD 1
+#define	MAX_THRESHOLD 20	/* more seems not reasonable... */
+
+__initfunc(void mac_mouse_setup(char *str, int *ints))
+{
+    if (ints[0] < 1) {
+	printk( "mac_mouse_setup: no arguments!\n" );
+	return;
+    }
+    else if (ints[0] > 2) {
+	printk( "mac_mouse_setup: too many arguments\n" );
+    }
+
+    if (ints[1] < MIN_THRESHOLD || ints[1] > MAX_THRESHOLD)
+	printk( "mac_mouse_setup: bad threshold value (ignored)\n" );
+    else {
+	mac_mouse_x_threshold = ints[1];
+	mac_mouse_y_threshold = ints[1];
+	if (ints[0] > 1) {
+	    if (ints[2] < MIN_THRESHOLD || ints[2] > MAX_THRESHOLD)
+		printk("mac_mouse_setup: bad threshold value (ignored)\n" );
+	    else
+		mac_mouse_y_threshold = ints[2];
+	}
+    }
+	
+}
+
+#ifdef MODULE
+#include <asm/setup.h>
+
+int init_module(void)
+{
+    return mac_mouse_init();
+}
+
+void cleanup_module(void)
+{
+    misc_deregister(&mac_mouse);
+}
+#endif