grip.c
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上传日期:2013-04-10
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- /*
- * $Id: grip.c,v 1.14 2000/06/06 21:13:36 vojtech Exp $
- *
- * Copyright (c) 1998-2000 Vojtech Pavlik
- *
- * Sponsored by SuSE
- */
- /*
- * Gravis/Kensington GrIP protocol joystick and gamepad driver for Linux
- */
- /*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Should you need to contact me, the author, you can do so either by
- * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
- * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
- */
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/gameport.h>
- #include <linux/input.h>
- #define GRIP_MODE_GPP 1
- #define GRIP_MODE_BD 2
- #define GRIP_MODE_XT 3
- #define GRIP_MODE_DC 4
- #define GRIP_LENGTH_GPP 24
- #define GRIP_STROBE_GPP 200 /* 200 us */
- #define GRIP_LENGTH_XT 4
- #define GRIP_STROBE_XT 64 /* 64 us */
- #define GRIP_MAX_CHUNKS_XT 10
- #define GRIP_MAX_BITS_XT 30
- #define GRIP_REFRESH_TIME HZ/50 /* 20 ms */
- struct grip {
- struct gameport *gameport;
- struct timer_list timer;
- struct input_dev dev[2];
- unsigned char mode[2];
- int used;
- int reads;
- int bads;
- };
- static int grip_btn_gpp[] = { BTN_START, BTN_SELECT, BTN_TR2, BTN_Y, 0, BTN_TL2, BTN_A, BTN_B, BTN_X, 0, BTN_TL, BTN_TR, -1 };
- static int grip_btn_bd[] = { BTN_THUMB, BTN_THUMB2, BTN_TRIGGER, BTN_TOP, BTN_BASE, -1 };
- static int grip_btn_xt[] = { BTN_TRIGGER, BTN_THUMB, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_SELECT, BTN_START, BTN_MODE, -1 };
- static int grip_btn_dc[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, -1 };
- static int grip_abs_gpp[] = { ABS_X, ABS_Y, -1 };
- static int grip_abs_bd[] = { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };
- static int grip_abs_xt[] = { ABS_X, ABS_Y, ABS_BRAKE, ABS_GAS, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, -1 };
- static int grip_abs_dc[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 };
- static char *grip_name[] = { NULL, "Gravis GamePad Pro", "Gravis Blackhawk Digital",
- "Gravis Xterminator Digital", "Gravis Xterminator DualControl" };
- static int *grip_abs[] = { 0, grip_abs_gpp, grip_abs_bd, grip_abs_xt, grip_abs_dc };
- static int *grip_btn[] = { 0, grip_btn_gpp, grip_btn_bd, grip_btn_xt, grip_btn_dc };
- static char grip_anx[] = { 0, 0, 3, 5, 5 };
- static char grip_cen[] = { 0, 0, 2, 2, 4 };
- /*
- * grip_gpp_read_packet() reads a Gravis GamePad Pro packet.
- */
- static int grip_gpp_read_packet(struct gameport *gameport, int shift, unsigned int *data)
- {
- unsigned long flags;
- unsigned char u, v;
- unsigned int t;
- int i;
- int strobe = gameport_time(gameport, GRIP_STROBE_GPP);
- data[0] = 0;
- t = strobe;
- i = 0;
- __save_flags(flags);
- __cli();
- v = gameport_read(gameport) >> shift;
- do {
- t--;
- u = v; v = (gameport_read(gameport) >> shift) & 3;
- if (~v & u & 1) {
- data[0] |= (v >> 1) << i++;
- t = strobe;
- }
- } while (i < GRIP_LENGTH_GPP && t > 0);
- __restore_flags(flags);
- if (i < GRIP_LENGTH_GPP) return -1;
- for (i = 0; i < GRIP_LENGTH_GPP && (data[0] & 0xfe4210) ^ 0x7c0000; i++)
- data[0] = data[0] >> 1 | (data[0] & 1) << (GRIP_LENGTH_GPP - 1);
- return -(i == GRIP_LENGTH_GPP);
- }
- /*
- * grip_xt_read_packet() reads a Gravis Xterminator packet.
- */
- static int grip_xt_read_packet(struct gameport *gameport, int shift, unsigned int *data)
- {
- unsigned int i, j, buf, crc;
- unsigned char u, v, w;
- unsigned long flags;
- unsigned int t;
- char status;
- int strobe = gameport_time(gameport, GRIP_STROBE_XT);
- data[0] = data[1] = data[2] = data[3] = 0;
- status = buf = i = j = 0;
- t = strobe;
- __save_flags(flags);
- __cli();
- v = w = (gameport_read(gameport) >> shift) & 3;
- do {
- t--;
- u = (gameport_read(gameport) >> shift) & 3;
- if (u ^ v) {
- if ((u ^ v) & 1) {
- buf = (buf << 1) | (u >> 1);
- t = strobe;
- i++;
- } else
- if ((((u ^ v) & (v ^ w)) >> 1) & ~(u | v | w) & 1) {
- if (i == 20) {
- crc = buf ^ (buf >> 7) ^ (buf >> 14);
- if (!((crc ^ (0x25cb9e70 >> ((crc >> 2) & 0x1c))) & 0xf)) {
- data[buf >> 18] = buf >> 4;
- status |= 1 << (buf >> 18);
- }
- j++;
- }
- t = strobe;
- buf = 0;
- i = 0;
- }
- w = v;
- v = u;
- }
- } while (status != 0xf && i < GRIP_MAX_BITS_XT && j < GRIP_MAX_CHUNKS_XT && t > 0);
- __restore_flags(flags);
- return -(status != 0xf);
- }
- /*
- * grip_timer() repeatedly polls the joysticks and generates events.
- */
- static void grip_timer(unsigned long private)
- {
- struct grip *grip = (void*) private;
- unsigned int data[GRIP_LENGTH_XT];
- struct input_dev *dev;
- int i, j;
- for (i = 0; i < 2; i++) {
- dev = grip->dev + i;
- grip->reads++;
- switch (grip->mode[i]) {
- case GRIP_MODE_GPP:
- if (grip_gpp_read_packet(grip->gameport, (i << 1) + 4, data)) {
- grip->bads++;
- break;
- }
- input_report_abs(dev, ABS_X, ((*data >> 15) & 1) - ((*data >> 16) & 1));
- input_report_abs(dev, ABS_Y, ((*data >> 13) & 1) - ((*data >> 12) & 1));
- for (j = 0; j < 12; j++)
- if (grip_btn_gpp[j])
- input_report_key(dev, grip_btn_gpp[j], (*data >> j) & 1);
- break;
- case GRIP_MODE_BD:
- if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
- grip->bads++;
- break;
- }
- input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f);
- input_report_abs(dev, ABS_Y, 63 - ((data[0] >> 8) & 0x3f));
- input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);
- input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1));
- input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
- for (j = 0; j < 5; j++)
- input_report_key(dev, grip_btn_bd[j], (data[3] >> (j + 4)) & 1);
- break;
- case GRIP_MODE_XT:
- if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
- grip->bads++;
- break;
- }
- input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f);
- input_report_abs(dev, ABS_Y, 63 - ((data[0] >> 8) & 0x3f));
- input_report_abs(dev, ABS_BRAKE, (data[1] >> 2) & 0x3f);
- input_report_abs(dev, ABS_GAS, (data[1] >> 8) & 0x3f);
- input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);
- input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1));
- input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
- input_report_abs(dev, ABS_HAT1X, ((data[2] >> 5) & 1) - ((data[2] >> 4) & 1));
- input_report_abs(dev, ABS_HAT1Y, ((data[2] >> 6) & 1) - ((data[2] >> 7) & 1));
- for (j = 0; j < 11; j++)
- input_report_key(dev, grip_btn_xt[j], (data[3] >> (j + 3)) & 1);
- break;
- case GRIP_MODE_DC:
- if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) {
- grip->bads++;
- break;
- }
- input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f);
- input_report_abs(dev, ABS_Y, (data[0] >> 8) & 0x3f);
- input_report_abs(dev, ABS_RX, (data[1] >> 2) & 0x3f);
- input_report_abs(dev, ABS_RY, (data[1] >> 8) & 0x3f);
- input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f);
- input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1));
- input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1));
- for (j = 0; j < 9; j++)
- input_report_key(dev, grip_btn_dc[j], (data[3] >> (j + 3)) & 1);
- break;
- }
- }
- mod_timer(&grip->timer, jiffies + GRIP_REFRESH_TIME);
- }
- static int grip_open(struct input_dev *dev)
- {
- struct grip *grip = dev->private;
- if (!grip->used++)
- mod_timer(&grip->timer, jiffies + GRIP_REFRESH_TIME);
- return 0;
- }
- static void grip_close(struct input_dev *dev)
- {
- struct grip *grip = dev->private;
- if (!--grip->used)
- del_timer(&grip->timer);
- }
- static void grip_connect(struct gameport *gameport, struct gameport_dev *dev)
- {
- struct grip *grip;
- unsigned int data[GRIP_LENGTH_XT];
- int i, j, t;
- if (!(grip = kmalloc(sizeof(struct grip), GFP_KERNEL)))
- return;
- memset(grip, 0, sizeof(struct grip));
- gameport->private = grip;
- grip->gameport = gameport;
- init_timer(&grip->timer);
- grip->timer.data = (long) grip;
- grip->timer.function = grip_timer;
- if (gameport_open(gameport, dev, GAMEPORT_MODE_RAW))
- goto fail1;
- for (i = 0; i < 2; i++) {
- if (!grip_gpp_read_packet(gameport, (i << 1) + 4, data)) {
- grip->mode[i] = GRIP_MODE_GPP;
- continue;
- }
- if (!grip_xt_read_packet(gameport, (i << 1) + 4, data)) {
- if (!(data[3] & 7)) {
- grip->mode[i] = GRIP_MODE_BD;
- continue;
- }
- if (!(data[2] & 0xf0)) {
- grip->mode[i] = GRIP_MODE_XT;
- continue;
- }
- grip->mode[i] = GRIP_MODE_DC;
- continue;
- }
- }
- if (!grip->mode[0] && !grip->mode[1])
- goto fail2;
- for (i = 0; i < 2; i++)
- if (grip->mode[i]) {
- grip->dev[i].private = grip;
- grip->dev[i].open = grip_open;
- grip->dev[i].close = grip_close;
- grip->dev[i].name = grip_name[grip->mode[i]];
- grip->dev[i].idbus = BUS_GAMEPORT;
- grip->dev[i].idvendor = GAMEPORT_ID_VENDOR_GRAVIS;
- grip->dev[i].idproduct = grip->mode[i];
- grip->dev[i].idversion = 0x0100;
- grip->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
- for (j = 0; (t = grip_abs[grip->mode[i]][j]) >= 0; j++) {
- set_bit(t, grip->dev[i].absbit);
- if (j < grip_cen[grip->mode[i]]) {
- grip->dev[i].absmin[t] = 14;
- grip->dev[i].absmax[t] = 52;
- grip->dev[i].absfuzz[t] = 1;
- grip->dev[i].absflat[t] = 2;
- continue;
- }
- if (j < grip_anx[grip->mode[i]]) {
- grip->dev[i].absmin[t] = 3;
- grip->dev[i].absmax[t] = 57;
- grip->dev[i].absfuzz[t] = 1;
- continue;
- }
- grip->dev[i].absmin[t] = -1;
- grip->dev[i].absmax[t] = 1;
- }
- for (j = 0; (t = grip_btn[grip->mode[i]][j]) >= 0; j++)
- if (t > 0)
- set_bit(t, grip->dev[i].keybit);
- input_register_device(grip->dev + i);
- printk(KERN_INFO "input%d: %s on gameport%d.%dn",
- grip->dev[i].number, grip_name[grip->mode[i]], gameport->number, i);
- }
- return;
- fail2: gameport_close(gameport);
- fail1: kfree(grip);
- }
- static void grip_disconnect(struct gameport *gameport)
- {
- int i;
- struct grip *grip = gameport->private;
- for (i = 0; i < 2; i++)
- if (grip->mode[i])
- input_unregister_device(grip->dev + i);
- gameport_close(gameport);
- kfree(grip);
- }
- static struct gameport_dev grip_dev = {
- connect: grip_connect,
- disconnect: grip_disconnect,
- };
- int __init grip_init(void)
- {
- gameport_register_device(&grip_dev);
- return 0;
- }
- void __exit grip_exit(void)
- {
- gameport_unregister_device(&grip_dev);
- }
- module_init(grip_init);
- module_exit(grip_exit);
- MODULE_LICENSE("GPL");