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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [drivers/] [char/] [atixlmouse.c] - Rev 1765
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/* * ATI XL Bus Mouse Driver for Linux * by Bob Harris (rth@sparta.com) * * Uses VFS interface for linux 0.98 (01OCT92) * * Modified by Chris Colohan (colohan@eecg.toronto.edu) * Modularised 8-Sep-95 Philip Blundell <pjb27@cam.ac.uk> * * version 0.3a */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/signal.h> #include <linux/errno.h> #include <linux/miscdevice.h> #include <linux/random.h> #include <asm/io.h> #include <asm/segment.h> #include <asm/system.h> #include <asm/irq.h> #define ATIXL_MOUSE_IRQ 5 /* H/W interrupt # set up on ATIXL board */ #define ATIXL_BUSMOUSE 3 /* Minor device # (mknod c 10 3 /dev/bm) */ /* ATI XL Inport Busmouse Definitions */ #define ATIXL_MSE_DATA_PORT 0x23d #define ATIXL_MSE_SIGNATURE_PORT 0x23e #define ATIXL_MSE_CONTROL_PORT 0x23c #define ATIXL_MSE_READ_BUTTONS 0x00 #define ATIXL_MSE_READ_X 0x01 #define ATIXL_MSE_READ_Y 0x02 /* Some nice ATI XL macros */ /* Select IR7, HOLD UPDATES (INT ENABLED), save X,Y */ #define ATIXL_MSE_DISABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \ outb( (0x20 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); } /* Select IR7, Enable updates (INT ENABLED) */ #define ATIXL_MSE_ENABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \ outb( (0xdf & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); } /* Select IR7 - Mode Register, NO INTERRUPTS */ #define ATIXL_MSE_INT_OFF() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \ outb( (0xe7 & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); } /* Select IR7 - Mode Register, DATA INTERRUPTS ENABLED */ #define ATIXL_MSE_INT_ON() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \ outb( (0x08 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); } /* Same general mouse structure */ static struct mouse_status { char buttons; char latch_buttons; int dx; int dy; int present; int ready; int active; struct wait_queue *wait; struct fasync_struct *fasync; } mouse; void mouse_interrupt(int irq, void *dev_id, struct pt_regs * regs) { char dx, dy, buttons; ATIXL_MSE_DISABLE_UPDATE(); /* Note that interrupts are still enabled */ outb(ATIXL_MSE_READ_X, ATIXL_MSE_CONTROL_PORT); /* Select IR1 - X movement */ dx = inb( ATIXL_MSE_DATA_PORT); outb(ATIXL_MSE_READ_Y, ATIXL_MSE_CONTROL_PORT); /* Select IR2 - Y movement */ dy = inb( ATIXL_MSE_DATA_PORT); outb(ATIXL_MSE_READ_BUTTONS, ATIXL_MSE_CONTROL_PORT); /* Select IR0 - Button Status */ buttons = inb( ATIXL_MSE_DATA_PORT); if (dx != 0 || dy != 0 || buttons != mouse.latch_buttons) { add_mouse_randomness((buttons << 16) + (dy << 8) + dx); mouse.latch_buttons |= buttons; mouse.dx += dx; mouse.dy += dy; mouse.ready = 1; wake_up_interruptible(&mouse.wait); if (mouse.fasync) kill_fasync(mouse.fasync, SIGIO); } ATIXL_MSE_ENABLE_UPDATE(); } static int fasync_mouse(struct inode *inode, struct file *filp, int on) { int retval; retval = fasync_helper(inode, filp, on, &mouse.fasync); if (retval < 0) return retval; return 0; } static void release_mouse(struct inode * inode, struct file * file) { fasync_mouse(inode, file, 0); if (--mouse.active) return; ATIXL_MSE_INT_OFF(); /* Interrupts are really shut down here */ mouse.ready = 0; free_irq(ATIXL_MOUSE_IRQ, NULL); MOD_DEC_USE_COUNT; } static int open_mouse(struct inode * inode, struct file * file) { if (!mouse.present) return -EINVAL; if (mouse.active++) return 0; if (request_irq(ATIXL_MOUSE_IRQ, mouse_interrupt, 0, "ATIXL mouse", NULL)) { mouse.active--; return -EBUSY; } mouse.ready = 0; mouse.dx = 0; mouse.dy = 0; mouse.buttons = mouse.latch_buttons = 0; ATIXL_MSE_INT_ON(); /* Interrupts are really enabled here */ MOD_INC_USE_COUNT; return 0; } static int write_mouse(struct inode * inode, struct file * file, const char * buffer, int count) { return -EINVAL; } static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count) { int i; if (count < 3) return -EINVAL; if (!mouse.ready) return -EAGAIN; ATIXL_MSE_DISABLE_UPDATE(); /* Allowed interrupts to occur during data gathering - shouldn't hurt */ put_user((char)(~mouse.latch_buttons&7) | 0x80 , buffer); if (mouse.dx < -127) mouse.dx = -127; if (mouse.dx > 127) mouse.dx = 127; put_user((char)mouse.dx, buffer + 1); if (mouse.dy < -127) mouse.dy = -127; if (mouse.dy > 127) mouse.dy = 127; put_user((char)-mouse.dy, buffer + 2); for(i = 3; i < count; i++) put_user(0x00, buffer + i); mouse.dx = 0; mouse.dy = 0; mouse.latch_buttons = mouse.buttons; mouse.ready = 0; ATIXL_MSE_ENABLE_UPDATE(); return i; /* i data bytes returned */ } static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait) { if (sel_type != SEL_IN) return 0; if (mouse.ready) return 1; select_wait(&mouse.wait,wait); return 0; } struct file_operations atixl_busmouse_fops = { NULL, /* mouse_seek */ read_mouse, write_mouse, NULL, /* mouse_readdir */ mouse_select, /* mouse_select */ NULL, /* mouse_ioctl */ NULL, /* mouse_mmap */ open_mouse, release_mouse, NULL, fasync_mouse, }; static struct miscdevice atixl_mouse = { ATIXL_BUSMOUSE, "atixl", &atixl_busmouse_fops }; int atixl_busmouse_init(void) { unsigned char a,b,c; a = inb( ATIXL_MSE_SIGNATURE_PORT ); /* Get signature */ b = inb( ATIXL_MSE_SIGNATURE_PORT ); c = inb( ATIXL_MSE_SIGNATURE_PORT ); if (( a != b ) && ( a == c )) printk(KERN_INFO "\nATI Inport "); else{ mouse.present = 0; return -EIO; } outb(0x80, ATIXL_MSE_CONTROL_PORT); /* Reset the Inport device */ outb(0x07, ATIXL_MSE_CONTROL_PORT); /* Select Internal Register 7 */ outb(0x0a, ATIXL_MSE_DATA_PORT); /* Data Interrupts 8+, 1=30hz, 2=50hz, 3=100hz, 4=200hz rate */ mouse.present = 1; mouse.active = 0; mouse.ready = 0; mouse.buttons = mouse.latch_buttons = 0; mouse.dx = mouse.dy = 0; mouse.wait = NULL; printk("Bus mouse detected and installed.\n"); misc_register(&atixl_mouse); return 0; } #ifdef MODULE int init_module(void) { return atixl_busmouse_init(); } void cleanup_module(void) { misc_deregister(&atixl_mouse); } #endif