/* * Amiga Mouse Driver for Linux 68k by Michael Rausch * based upon: * * Logitech Bus Mouse Driver for Linux * by James Banks * * Mods by Matthew Dillon * calls verify_area() * tracks better when X is busy or paging * * Heavily modified by David Giller * changed from queue- to counter- driven * hacked out a (probably incorrect) mouse_poll * * Modified again by Nathan Laredo to interface with * 0.96c-pl1 IRQ handling changes (13JUL92) * didn't bother touching poll code. * * Modified the poll() code blindly to conform to the VFS * requirements. 92.07.14 - Linus. Somebody should test it out. * * Modified by Johan Myreen to make room for other mice (9AUG92) * removed assignment chr_fops[10] = &mouse_fops; see mouse.c * renamed mouse_fops => bus_mouse_fops, made bus_mouse_fops public. * renamed this file mouse.c => busmouse.c * * Modified for use in the 1.3 kernels by Jes Sorensen. * * Moved the isr-allocation to the mouse_{open,close} calls, as there * is no reason to service the mouse in the vertical blank isr if * the mouse is not in use. Jes Sorensen */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MSE_INT_ON() mouseint_allowed = 1 #define MSE_INT_OFF() mouseint_allowed = 0 static struct mouse_status mouse; static int mouseint_allowed; static void mouse_interrupt(int irq, void *dummy, struct pt_regs *fp) { static int lastx=0, lasty=0; int dx, dy; int nx, ny; unsigned char buttons; unsigned short joy0dat, potgor; if(!mouseint_allowed) return; MSE_INT_OFF(); /* * This routine assumes, just like Kickstart, that the mouse * has not moved more than 127 ticks since last VBL. */ joy0dat = custom.joy0dat; nx = joy0dat & 0xff; ny = joy0dat >> 8; dx = nx - lastx; if (dx < - 127) dx = (256 + nx) - lastx; if (dx > 127) dx = (nx - 256) - lastx; dy = ny - lasty; if (dy < - 127) dy = (256 + ny) - lasty; if (dy > 127) dy = (ny - 256) - lasty; lastx = nx; lasty = ny; #if 0 dx = -lastdx; dx += (lastdx = joy0dat & 0xff); if (dx < -127) dx = -255-dx; /* underrun */ else if (dx > 127) dx = 255-dx; /* overflow */ dy = -lastdy; dy += (lastdy = joy0dat >> 8); if (dy < -127) dy = -255-dy; else if (dy > 127) dy = 255-dy; #endif potgor = custom.potgor; buttons = (ciaa.pra & 0x40 ? 4 : 0) | /* left button; note that the bits are low-active, as are the expected results -> double negation */ #if 1 (potgor & 0x0100 ? 2 : 0) | /* middle button; emulation goes here */ #endif (potgor & 0x0400 ? 1 : 0); /* right button */ if (dx != 0 || dy != 0 || buttons != mouse.buttons) { add_mouse_randomness((buttons << 16) + (dy << 8) + dx); mouse.buttons = buttons; mouse.dx += dx; mouse.dy -= dy; mouse.ready = 1; wake_up_interruptible(&mouse.wait); /* * keep dx/dy reasonable, but still able to track when X (or * whatever) must page or is busy (i.e. long waits between * reads) */ if (mouse.dx < -2048) mouse.dx = -2048; else if (mouse.dx > 2048) mouse.dx = 2048; if (mouse.dy < -2048) mouse.dy = -2048; else if (mouse.dy > 2048) mouse.dy = 2048; if (mouse.fasyncptr) kill_fasync(mouse.fasyncptr, SIGIO); } MSE_INT_ON(); } 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; } /* * close access to the mouse */ static int release_mouse(struct inode * inode, struct file * file) { fasync_mouse(file, 0); if (--mouse.active) return 0; free_irq(IRQ_AMIGA_VERTB, mouse_interrupt); MSE_INT_OFF(); MOD_DEC_USE_COUNT; return 0; } /* * open access to the mouse, currently only one open is * allowed. */ static int open_mouse(struct inode * inode, struct file * file) { if (!mouse.present) return -EINVAL; if (mouse.active++) return 0; /* * use VBL to poll mouse deltas */ if(request_irq(IRQ_AMIGA_VERTB, mouse_interrupt, 0, "Amiga mouse", mouse_interrupt)) { mouse.present = 0; printk(KERN_INFO "Installing Amiga mouse failed.\n"); return -EIO; } mouse.ready = 0; mouse.dx = 0; mouse.dy = 0; mouse.buttons = 0x87; mouse.active = 1; MOD_INC_USE_COUNT; MSE_INT_ON(); return 0; } /* * writes are disallowed */ static long write_mouse(struct inode * inode, struct file * file, const char * buffer, unsigned long count) { return -EINVAL; } /* * read mouse data. Currently never blocks. */ static long read_mouse(struct inode * inode, struct file * file, char * buffer, unsigned long count) { int r; int dx; int dy; unsigned char buttons; if (count < 3) return -EINVAL; if ((r = verify_area(VERIFY_WRITE, buffer, count))) return r; if (!mouse.ready) return -EAGAIN; /* * Obtain the current mouse parameters and limit as appropriate for * the return data format. Interrupts are only disabled while * obtaining the parameters, NOT during the puts_user() calls, * so paging in put_user() does not effect mouse tracking. */ MSE_INT_OFF(); dx = mouse.dx; dy = mouse.dy; if (dx < -127) dx = -127; else if (dx > 127) dx = 127; if (dy < -127) dy = -127; else if (dy > 127) dy = 127; buttons = mouse.buttons; mouse.dx -= dx; mouse.dy -= dy; mouse.ready = 0; MSE_INT_ON(); put_user(buttons | 0x80, buffer); put_user((char)dx, buffer + 1); put_user((char)dy, buffer + 2); for (r = 3; r < count; r++) put_user(0x00, buffer + r); return r; } /* * poll for mouse input */ 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 amiga_mouse_fops = { NULL, /* mouse_seek */ read_mouse, write_mouse, NULL, /* mouse_readdir */ mouse_poll, /* mouse_poll */ NULL, /* mouse_ioctl */ NULL, /* mouse_mmap */ open_mouse, release_mouse, NULL, fasync_mouse, }; static struct miscdevice amiga_mouse = { AMIGAMOUSE_MINOR, "amigamouse", &amiga_mouse_fops }; __initfunc(int amiga_mouse_init(void)) { if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE)) return -ENODEV; custom.joytest = 0; /* reset counters */ MSE_INT_OFF(); mouse.active = 0; mouse.ready = 0; mouse.buttons = 0x87; mouse.dx = 0; mouse.dy = 0; mouse.wait = NULL; mouse.present = 1; printk(KERN_INFO "Amiga mouse installed.\n"); misc_register(&amiga_mouse); return 0; } #ifdef MODULE #include int init_module(void) { return amiga_mouse_init(); } void cleanup_module(void) { misc_deregister(&amiga_mouse); } #endif