patch-2.1.125 linux/drivers/char/joystick/joy-gravis.c

• Lines: 357
• Date: Thu Oct 8 17:25:16 1998
• Orig file: v2.1.124/linux/drivers/char/joystick/joy-gravis.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.124/linux/drivers/char/joystick/joy-gravis.c linux/drivers/char/joystick/joy-gravis.c
@@ -0,0 +1,356 @@
+/*
+ *  joy-gravis.c  Version 1.2
+ *
+ *  Copyright (c) 1998 Vojtech Pavlik
+ */
+
+/*
+ * This is a module for the Linux joystick driver, supporting
+ * Gravis GrIP digital joystick family.
+ */
+
+/*
+ * 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@ucw.cz>, or by paper mail:
+ * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
+ */
+
+#include <asm/io.h>
+#include <asm/system.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/joystick.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#define JS_GR_MODE_GPP		1
+#define JS_GR_LENGTH_GPP	24
+#define JS_GR_STROBE_GPP	75
+
+#define JS_GR_MODE_XT		2
+#define JS_GR_LENGTH_XT		4
+#define JS_GR_STROBE_XT		30
+#define JS_GR_MAX_CHUNKS_XT	10	
+#define JS_GR_MAX_BITS_XT	30	
+
+static int js_gr_port_list[] __initdata = {0x201, 0};
+static struct js_port* js_gr_port __initdata = NULL;
+
+struct js_gr_info {
+	int io;
+	unsigned char mode[2];
+};
+
+/*
+ * js_gr_gpp_read_packet() reads a Gravis GamePad Pro packet.
+ */
+
+static int js_gr_gpp_read_packet(int io, int shift, unsigned int *data)
+{
+	unsigned int t, t1;
+	unsigned char u, v;
+	int i;
+	unsigned long flags;
+
+	int strobe = (js_time_speed * JS_GR_STROBE_GPP) >> 10;
+
+	i = 0;
+	data[0] = 0;
+
+	__save_flags(flags);
+	__cli();
+	u = inb(io) >> shift;
+	t = js_get_time();
+
+	do {
+		v = (inb(io) >> shift) & 3;
+		t1 = js_get_time();
+		if ((u ^ v) & u & 1) {
+			data[0] |= (v >> 1) << i++;
+			t = t1;
+		}
+		u = v;
+	} while (i < JS_GR_LENGTH_GPP && js_delta(t1,t) < strobe);
+
+	__restore_flags(flags);
+
+	if (i < JS_GR_LENGTH_GPP) return -1;
+
+	for (i = 0; i < JS_GR_LENGTH_GPP && (data[0] & 0xfe4210) ^ 0x7c0000; i++)
+		data[0] = data[0] >> 1 | (data[0] & 1) << 23;
+
+	return -(i == JS_GR_LENGTH_GPP);
+}
+
+/*
+ * js_gr_xt_read_packet() reads a Gravis Xterminator packet.
+ */
+
+static int js_gr_xt_read_packet(int io, int shift, unsigned int *data)
+{
+	unsigned int t, t1;
+	unsigned char u, v, w;
+	unsigned int i, j, buf, crc;
+	unsigned long flags;
+	char status;
+
+	int strobe = (js_time_speed * JS_GR_STROBE_XT) >> 10;
+
+	data[0] = data[1] = data[2] = data[3] = 0;
+	status = buf = i = j = 0;
+
+	__save_flags(flags);
+	__cli();
+
+	v = w = (inb(io) >> shift) & 3;
+	t = js_get_time();
+
+	do {
+		u = (inb(io) >> shift) & 3;
+		t1 = js_get_time();
+
+		if (u ^ v) {
+
+			if ((u ^ v) & 1) {
+				buf = (buf << 1) | (u >> 1);
+				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++;
+				}
+				buf = 0;
+				i = 0;
+			}
+
+			t = t1;
+			w = v;
+			v = u;
+		}
+
+	} while (status != 0xf && i < JS_GR_MAX_BITS_XT && j < JS_GR_MAX_CHUNKS_XT && js_delta(t1,t) < strobe);
+
+	__restore_flags(flags);
+
+	return -(status != 0xf);
+}
+
+/*
+ * js_gr_read() reads and analyzes GrIP joystick data.
+ */
+
+static int js_gr_read(void *xinfo, int **axes, int **buttons)
+{
+	struct js_gr_info *info = xinfo;
+	unsigned int data[JS_GR_LENGTH_XT];
+	int i;
+
+	for (i = 0; i < 2; i++)
+		switch (info->mode[i]) {
+
+			case JS_GR_MODE_GPP:
+
+				if (js_gr_gpp_read_packet(info->io, (i << 1) + 4, data)) return -1;
+
+				axes[i][0] = ((data[0] >> 15) & 1) - ((data[0] >> 16) & 1);
+				axes[i][1] = ((data[0] >> 13) & 1) - ((data[0] >> 12) & 1);
+
+				data[0] = ((data[0] >> 6) & 0x37) | (data[0] & 0x08) | ((data[0] << 1) & 0x40) |
+				       ((data[0] << 5) & 0x80) | ((data[0] << 8) & 0x300);
+
+				buttons[i][0] = (data[0] & 0xfc) | ((data[0] >> 1) & 0x101) | ((data[0] << 1) & 0x202);
+
+				break;
+
+			case JS_GR_MODE_XT:
+
+				if (js_gr_xt_read_packet(info->io, (i << 1) + 4, data)) return -1;
+
+				axes[i][0] =       (data[0] >> 2) & 0x3f;
+				axes[i][1] = 63 - ((data[0] >> 8) & 0x3f);
+				axes[i][2] = (data[1] >> 2) & 0x3f;
+				axes[i][3] = (data[1] >> 8) & 0x3f;
+				axes[i][4] = (data[2] >> 8) & 0x3f;
+				axes[i][5] = ((data[2] >> 1) & 1) - ( data[2]       & 1);
+				axes[i][6] = ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1);
+				axes[i][7] = ((data[2] >> 5) & 1) - ((data[2] >> 4) & 1);
+				axes[i][8] = ((data[2] >> 6) & 1) - ((data[2] >> 7) & 1);
+
+				buttons[i][0] = (data[3] >> 3) & 0x7ff;
+
+				break;
+
+			default:
+				break;
+
+		}
+
+
+	return 0;
+}
+
+/*
+ * js_gr_open() is a callback from the file open routine.
+ */
+
+static int js_gr_open(struct js_dev *jd)
+{
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+/*
+ * js_gr_close() is a callback from the file release routine.
+ */
+
+static int js_gr_close(struct js_dev *jd)
+{
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+/*
+ * js_gr_init_corr() initializes correction values of
+ * GrIP joysticks.
+ */
+
+static void __init js_gr_init_corr(int mode, struct js_corr *corr)
+{
+	int i;
+
+	switch (mode) {
+
+		case JS_GR_MODE_GPP:
+
+			for (i = 0; i < 2; i++) {
+				corr[i].type = JS_CORR_BROKEN;
+				corr[i].prec = 0;
+				corr[i].coef[0] = 0;
+				corr[i].coef[1] = 0;
+				corr[i].coef[2] = (1 << 29);
+				corr[i].coef[3] = (1 << 29);
+			}
+
+			break;
+
+		case JS_GR_MODE_XT:
+
+			for (i = 0; i < 5; i++) {
+				corr[i].type = JS_CORR_BROKEN;
+				corr[i].prec = 0;
+				corr[i].coef[0] = 31 - 4;
+				corr[i].coef[1] = 32 + 4;
+				corr[i].coef[2] = (1 << 29) / (32 - 14);
+				corr[i].coef[3] = (1 << 29) / (32 - 14);
+			}
+
+			for (i = 5; i < 9; i++) {
+				corr[i].type = JS_CORR_BROKEN;
+				corr[i].prec = 0;
+				corr[i].coef[0] = 0;
+				corr[i].coef[1] = 0;
+				corr[i].coef[2] = (1 << 29);
+				corr[i].coef[3] = (1 << 29);
+			}
+
+			break;
+
+	}
+}
+
+/*
+ * js_gr_probe() probes fro GrIP joysticks.
+ */
+
+static struct js_port __init *js_gr_probe(int io, struct js_port *port)
+{
+	struct js_gr_info info;
+	char *names[] = { NULL, "Gravis GamePad Pro", "Gravis Xterminator" };
+	char axes[] = { 0, 2, 9 };
+	char buttons[] = { 0, 10, 11 };
+	unsigned int data[JS_GR_LENGTH_XT];
+	int i;
+
+	if (check_region(io, 1)) return port;
+
+	info.mode[0] = info.mode[1] = 0;
+
+	for (i = 0; i < 2; i++) {
+		if (!js_gr_gpp_read_packet(io, (i << 1) + 4, data)) info.mode[i] = JS_GR_MODE_GPP;
+		if (!js_gr_xt_read_packet(io, (i << 1) + 4, data)) info.mode[i] = JS_GR_MODE_XT;
+	}
+
+	if (!info.mode[0] && !info.mode[1]) return port;
+
+	info.io = io;
+
+	request_region(io, 1, "joystick (gravis)");
+	port = js_register_port(port, &info, 2, sizeof(struct js_gr_info), js_gr_read);
+
+	for (i = 0; i < 2; i++)
+		if (info.mode[i]) {
+			printk(KERN_INFO "js%d: %s at %#x\n",
+				js_register_device(port, i, axes[info.mode[i]], buttons[info.mode[i]],
+					names[info.mode[i]], js_gr_open, js_gr_close),
+				names[info.mode[i]], io);
+			js_gr_init_corr(info.mode[i], port->corr[i]);
+		}
+
+	return port;
+}
+
+#ifdef MODULE
+int init_module(void)
+#else
+int __init js_gr_init(void)
+#endif
+{
+	int *p;
+
+	for (p = js_gr_port_list; *p; p++) js_gr_port = js_gr_probe(*p, js_gr_port);
+	if (js_gr_port) return 0;
+
+#ifdef MODULE
+	printk(KERN_WARNING "joy-gravis: no joysticks found\n");
+#endif
+
+	return -ENODEV;
+}
+
+#ifdef MODULE
+void cleanup_module(void)
+{
+	int i;
+	struct js_gr_info *info;
+
+	while (js_gr_port) {
+		for (i = 0; i < js_gr_port->ndevs; i++)
+			if (js_gr_port->devs[i])
+				js_unregister_device(js_gr_port->devs[i]);
+		info = js_gr_port->info;
+		release_region(info->io, 1);
+		js_gr_port = js_unregister_port(js_gr_port);
+	}
+}
+#endif