274 lines
6.5 KiB
C
274 lines
6.5 KiB
C
/*
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* $Id: cobra.c,v 1.19 2002/01/22 20:26:52 vojtech Exp $
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*
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* Copyright (c) 1999-2001 Vojtech Pavlik
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*/
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/*
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* Creative Labs Blaster GamePad Cobra driver for Linux
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Should you need to contact me, the author, you can do so either by
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* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
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* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/gameport.h>
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#include <linux/input.h>
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#include <linux/jiffies.h>
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#define DRIVER_DESC "Creative Labs Blaster GamePad Cobra driver"
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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#define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */
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#define COBRA_LENGTH 36
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static int cobra_btn[] = { BTN_START, BTN_SELECT, BTN_TL, BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL2, BTN_TR2, 0 };
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struct cobra {
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struct gameport *gameport;
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struct input_dev *dev[2];
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int reads;
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int bads;
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unsigned char exists;
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char phys[2][32];
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};
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static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
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{
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unsigned long flags;
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unsigned char u, v, w;
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__u64 buf[2];
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int r[2], t[2];
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int i, j, ret;
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int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
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for (i = 0; i < 2; i++) {
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r[i] = buf[i] = 0;
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t[i] = COBRA_MAX_STROBE;
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}
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local_irq_save(flags);
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u = gameport_read(gameport);
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do {
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t[0]--; t[1]--;
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v = gameport_read(gameport);
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for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
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if (w & 0x30) {
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if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
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buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
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t[i] = strobe;
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u = v;
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} else t[i] = 0;
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}
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} while (t[0] > 0 || t[1] > 0);
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local_irq_restore(flags);
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ret = 0;
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for (i = 0; i < 2; i++) {
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if (r[i] != COBRA_LENGTH) continue;
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for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
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buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
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if (j < COBRA_LENGTH) ret |= (1 << i);
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data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0)
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| ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
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| ((buf[i] >> 11) & 0x1f00000);
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}
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return ret;
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}
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static void cobra_poll(struct gameport *gameport)
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{
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struct cobra *cobra = gameport_get_drvdata(gameport);
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struct input_dev *dev;
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unsigned int data[2];
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int i, j, r;
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cobra->reads++;
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if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
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cobra->bads++;
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return;
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}
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for (i = 0; i < 2; i++)
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if (cobra->exists & r & (1 << i)) {
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dev = cobra->dev[i];
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input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
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input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
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for (j = 0; cobra_btn[j]; j++)
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input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
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input_sync(dev);
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}
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}
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static int cobra_open(struct input_dev *dev)
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{
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struct cobra *cobra = dev->private;
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gameport_start_polling(cobra->gameport);
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return 0;
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}
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static void cobra_close(struct input_dev *dev)
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{
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struct cobra *cobra = dev->private;
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gameport_stop_polling(cobra->gameport);
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}
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static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
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{
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struct cobra *cobra;
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struct input_dev *input_dev;
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unsigned int data[2];
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int i, j;
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int err;
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cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
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if (!cobra)
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return -ENOMEM;
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cobra->gameport = gameport;
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gameport_set_drvdata(gameport, cobra);
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err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
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if (err)
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goto fail1;
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cobra->exists = cobra_read_packet(gameport, data);
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for (i = 0; i < 2; i++)
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if ((cobra->exists >> i) & data[i] & 1) {
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printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
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" Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
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cobra->exists &= ~(1 << i);
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}
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if (!cobra->exists) {
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err = -ENODEV;
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goto fail2;
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}
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gameport_set_poll_handler(gameport, cobra_poll);
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gameport_set_poll_interval(gameport, 20);
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for (i = 0; i < 2; i++) {
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if (~(cobra->exists >> i) & 1)
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continue;
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cobra->dev[i] = input_dev = input_allocate_device();
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if (!input_dev) {
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err = -ENOMEM;
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goto fail3;
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}
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sprintf(cobra->phys[i], "%s/input%d", gameport->phys, i);
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input_dev->name = "Creative Labs Blaster GamePad Cobra";
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input_dev->phys = cobra->phys[i];
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input_dev->id.bustype = BUS_GAMEPORT;
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input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
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input_dev->id.product = 0x0008;
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input_dev->id.version = 0x0100;
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input_dev->cdev.dev = &gameport->dev;
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input_dev->private = cobra;
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input_dev->open = cobra_open;
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input_dev->close = cobra_close;
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input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
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for (j = 0; cobra_btn[j]; j++)
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set_bit(cobra_btn[j], input_dev->keybit);
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input_register_device(cobra->dev[i]);
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}
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return 0;
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fail3: for (i = 0; i < 2; i++)
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if (cobra->dev[i])
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input_unregister_device(cobra->dev[i]);
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fail2: gameport_close(gameport);
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fail1: gameport_set_drvdata(gameport, NULL);
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kfree(cobra);
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return err;
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}
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static void cobra_disconnect(struct gameport *gameport)
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{
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struct cobra *cobra = gameport_get_drvdata(gameport);
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int i;
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for (i = 0; i < 2; i++)
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if ((cobra->exists >> i) & 1)
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input_unregister_device(cobra->dev[i]);
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gameport_close(gameport);
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gameport_set_drvdata(gameport, NULL);
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kfree(cobra);
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}
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static struct gameport_driver cobra_drv = {
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.driver = {
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.name = "cobra",
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},
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.description = DRIVER_DESC,
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.connect = cobra_connect,
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.disconnect = cobra_disconnect,
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};
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static int __init cobra_init(void)
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{
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gameport_register_driver(&cobra_drv);
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return 0;
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}
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static void __exit cobra_exit(void)
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{
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gameport_unregister_driver(&cobra_drv);
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}
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module_init(cobra_init);
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module_exit(cobra_exit);
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