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[/] [or1k_old/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [char/] [busmouse.c] - Rev 1765
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/* * 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_select * * Modified again by Nathan Laredo to interface with * 0.96c-pl1 IRQ handling changes (13JUL92) * didn't bother touching select code. * * Modified the select() 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 * * Minor addition by Cliff Matthews * added fasync support * * Modularised 6-Sep-95 Philip Blundell <pjb27@cam.ac.uk> * * Replaced dumb busy loop with udelay() 16 Nov 95 * Nathan Laredo <laredo@gnu.ai.mit.edu> * * Track I/O ports with request_region(). 12 Dec 95 Philip Blundell */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/busmouse.h> #include <linux/signal.h> #include <linux/errno.h> #include <linux/mm.h> #include <linux/miscdevice.h> #include <linux/random.h> #include <linux/delay.h> #include <linux/ioport.h> #include <asm/io.h> #include <asm/segment.h> #include <asm/system.h> #include <asm/irq.h> static struct mouse_status mouse; static int mouse_irq = MOUSE_IRQ; void bmouse_setup(char *str, int *ints) { if (ints[0] > 0) mouse_irq=ints[1]; } static void mouse_interrupt(int irq, void *dev_id, struct pt_regs *regs) { char dx, dy; unsigned char buttons; outb(MSE_READ_X_LOW, MSE_CONTROL_PORT); dx = (inb(MSE_DATA_PORT) & 0xf); outb(MSE_READ_X_HIGH, MSE_CONTROL_PORT); dx |= (inb(MSE_DATA_PORT) & 0xf) << 4; outb(MSE_READ_Y_LOW, MSE_CONTROL_PORT ); dy = (inb(MSE_DATA_PORT) & 0xf); outb(MSE_READ_Y_HIGH, MSE_CONTROL_PORT); buttons = inb(MSE_DATA_PORT); dy |= (buttons & 0xf) << 4; buttons = ((buttons >> 5) & 0x07); 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; if (mouse.dx > 2048) mouse.dx = 2048; if (mouse.dy < -2048) mouse.dy = -2048; if (mouse.dy > 2048) mouse.dy = 2048; if (mouse.fasyncptr) kill_fasync(mouse.fasyncptr, SIGIO); } MSE_INT_ON(); } static int fasync_mouse(struct inode *inode, struct file *filp, int on) { int retval; retval = fasync_helper(inode, filp, on, &mouse.fasyncptr); if (retval < 0) return retval; return 0; } /* * close access to the mouse */ static void close_mouse(struct inode * inode, struct file * file) { fasync_mouse(inode, file, 0); if (--mouse.active) return; MSE_INT_OFF(); free_irq(mouse_irq, NULL); MOD_DEC_USE_COUNT; } /* * open access to the mouse */ static int open_mouse(struct inode * inode, struct file * file) { if (!mouse.present) return -EINVAL; if (mouse.active++) return 0; if (request_irq(mouse_irq, mouse_interrupt, 0, "busmouse", NULL)) { mouse.active--; return -EBUSY; } mouse.ready = 0; mouse.dx = 0; mouse.dy = 0; mouse.buttons = 0x87; MOD_INC_USE_COUNT; MSE_INT_ON(); return 0; } /* * writes are disallowed */ static int write_mouse(struct inode * inode, struct file * file, const char * buffer, int count) { return -EINVAL; } /* * read mouse data. Currently never blocks. */ static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count) { int r; int dx; int dy; unsigned char buttons; /* long flags; */ 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_fs_byte() calls, * so paging in put_user() does not effect mouse tracking. */ /* save_flags(flags); cli(); */ disable_irq(mouse_irq); dx = mouse.dx; dy = mouse.dy; if (dx < -127) dx = -127; if (dx > 127) dx = 127; if (dy < -127) dy = -127; if (dy > 127) dy = 127; buttons = mouse.buttons; mouse.dx -= dx; mouse.dy -= dy; mouse.ready = 0; enable_irq(mouse_irq); /* restore_flags(flags); */ 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; } /* * select for mouse input */ static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait) { if (sel_type == SEL_IN) { if (mouse.ready) return 1; select_wait(&mouse.wait, wait); } return 0; } struct file_operations bus_mouse_fops = { NULL, /* mouse_seek */ read_mouse, write_mouse, NULL, /* mouse_readdir */ mouse_select, /* mouse_select */ NULL, /* mouse_ioctl */ NULL, /* mouse_mmap */ open_mouse, close_mouse, NULL, fasync_mouse, }; static struct miscdevice bus_mouse = { LOGITECH_BUSMOUSE, "busmouse", &bus_mouse_fops }; int bus_mouse_init(void) { if (check_region(LOGIBM_BASE, LOGIBM_EXTENT)) { mouse.present = 0; return -EIO; } outb(MSE_CONFIG_BYTE, MSE_CONFIG_PORT); outb(MSE_SIGNATURE_BYTE, MSE_SIGNATURE_PORT); udelay(100L); /* wait for reply from mouse */ if (inb(MSE_SIGNATURE_PORT) != MSE_SIGNATURE_BYTE) { mouse.present = 0; return -EIO; } outb(MSE_DEFAULT_MODE, MSE_CONFIG_PORT); MSE_INT_OFF(); request_region(LOGIBM_BASE, LOGIBM_EXTENT, "busmouse"); mouse.present = 1; mouse.active = 0; mouse.ready = 0; mouse.buttons = 0x87; mouse.dx = 0; mouse.dy = 0; mouse.wait = NULL; printk(KERN_INFO "Logitech bus mouse detected, using IRQ %d.\n", mouse_irq); misc_register(&bus_mouse); return 0; } #ifdef MODULE int init_module(void) { return bus_mouse_init(); } void cleanup_module(void) { misc_deregister(&bus_mouse); release_region(LOGIBM_BASE, LOGIBM_EXTENT); } #endif
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