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/*
* joy-analog.h Version 1.2
*
* Copyright (c) 1996-1998 Vojtech Pavlik
*/
/*
* This file is designed to be included in any joystick driver
* that communicates with standard analog joysticks. This currently
* is: joy-analog.c, joy-assasin.c, and joy-lightning.c
*/
/*
* 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
*/
#define JS_AN_AXES_STD 0x0f
#define JS_AN_BUTTONS_STD 0xf0
#define JS_AN_BUTTONS_CHF 0x01
#define JS_AN_HAT1_CHF 0x02
#define JS_AN_HAT2_CHF 0x04
#define JS_AN_ANY_CHF 0x07
#define JS_AN_HAT_FCS 0x08
#define JS_AN_HATS_ALL 0x0e
#define JS_AN_BUTTON_PXY_X 0x10
#define JS_AN_BUTTON_PXY_Y 0x20
#define JS_AN_BUTTON_PXY_U 0x40
#define JS_AN_BUTTON_PXY_V 0x80
#define JS_AN_BUTTONS_PXY_XY 0x30
#define JS_AN_BUTTONS_PXY_UV 0xc0
#define JS_AN_BUTTONS_PXY 0xf0
static struct {
int x;
int y;
} js_an_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1, 0}, { 0, 1}, {-1, 0}};
struct js_an_info {
int io;
unsigned char mask[2];
unsigned int extensions;
int axes[4];
int initial[4];
unsigned char buttons;
};
/*
* js_an_decode() decodes analog joystick data.
*/
static void js_an_decode(struct js_an_info *info, int **axes, int **buttons)
{
int i, j, k;
int hat1, hat2, hat3;
hat1 = hat2 = hat3 = 0;
if (info->mask[0] & JS_AN_BUTTONS_STD) buttons[0][0] = 0;
if (info->mask[1] & JS_AN_BUTTONS_STD) buttons[1][0] = 0;
if (info->extensions & JS_AN_ANY_CHF) {
switch (info->buttons) {
case 0x1: buttons[0][0] = 0x01; break;
case 0x2: buttons[0][0] = 0x02; break;
case 0x4: buttons[0][0] = 0x04; break;
case 0x8: buttons[0][0] = 0x08; break;
case 0x5: buttons[0][0] = 0x10; break;
case 0x9: buttons[0][0] = 0x20; break;
case 0xf: hat1 = 1; break;
case 0xb: hat1 = 2; break;
case 0x7: hat1 = 3; break;
case 0x3: hat1 = 4; break;
case 0xe: hat2 = 1; break;
case 0xa: hat2 = 2; break;
case 0x6: hat2 = 3; break;
case 0xc: hat2 = 4; break;
}
k = info->extensions & JS_AN_BUTTONS_CHF ? 6 : 4;
} else {
for (i = 1; i >= 0; i--)
for (j = k = 0; j < 4; j++)
if (info->mask[i] & (0x10 << j))
buttons[i][0] |= ((info->buttons >> j) & 1) << k++;
}
if (info->extensions & JS_AN_BUTTON_PXY_X)
buttons[0][0] |= (info->axes[2] < (info->initial[2] >> 1)) << k++;
if (info->extensions & JS_AN_BUTTON_PXY_Y)
buttons[0][0] |= (info->axes[3] < (info->initial[3] >> 1)) << k++;
if (info->extensions & JS_AN_BUTTON_PXY_U)
buttons[0][0] |= (info->axes[2] > (info->initial[2] + (info->initial[2] >> 1))) << k++;
if (info->extensions & JS_AN_BUTTON_PXY_V)
buttons[0][0] |= (info->axes[3] > (info->initial[3] + (info->initial[3] >> 1))) << k++;
if (info->extensions & JS_AN_HAT_FCS)
for (j = 0; j < 4; j++)
if (info->axes[3] < ((info->initial[3] * ((j << 1) + 1)) >> 3)) {
hat3 = j + 1;
break;
}
for (i = 1; i >= 0; i--)
for (j = k = 0; j < 4; j++)
if (info->mask[i] & (1 << j))
axes[i][k++] = info->axes[j];
if (info->extensions & JS_AN_HAT1_CHF) {
axes[0][k++] = js_an_hat_to_axis[hat1].x;
axes[0][k++] = js_an_hat_to_axis[hat1].y;
}
if (info->extensions & JS_AN_HAT2_CHF) {
axes[0][k++] = js_an_hat_to_axis[hat2].x;
axes[0][k++] = js_an_hat_to_axis[hat2].y;
}
if (info->extensions & JS_AN_HAT_FCS) {
axes[0][k++] = js_an_hat_to_axis[hat3].x;
axes[0][k++] = js_an_hat_to_axis[hat3].y;
}
}
/*
* js_an_count_bits() counts set bits in a byte.
*/
static inline int js_an_count_bits(unsigned long c)
{
int i = 0;
while (c) {
i += c & 1;
c >>= 1;
}
return i;
}
/*
* js_an_init_corr() initializes the correction values for
* analog joysticks.
*/
static void __init js_an_init_corr(struct js_an_info *info, int **axes, struct js_corr **corr, int prec)
{
int i, j, t;
for (i = 0; i < 2; i++)
for (j = 0; j < js_an_count_bits(info->mask[i] & 0xf); j++) {
if ((j == 2 && (info->mask[i] & 0xb) == 0xb) ||
(j == 3 && (info->mask[i] & 0xf) == 0xf)) {
t = (axes[i][0] + axes[i][1]) >> 1;
} else {
t = axes[i][j];
}
corr[i][j].type = JS_CORR_BROKEN;
corr[i][j].prec = prec;
corr[i][j].coef[0] = t - (t >> 3);
corr[i][j].coef[1] = t + (t >> 3);
corr[i][j].coef[2] = (1 << 29) / (t - (t >> 2) + 1);
corr[i][j].coef[3] = (1 << 29) / (t - (t >> 2) + 1);
}
i = js_an_count_bits(info->mask[0] & 0xf);
for (j = i; j < i + (js_an_count_bits(info->extensions & JS_AN_HATS_ALL) << 1); j++) {
corr[0][j].type = JS_CORR_BROKEN;
corr[0][j].prec = 0;
corr[0][j].coef[0] = 0;
corr[0][j].coef[1] = 0;
corr[0][j].coef[2] = (1 << 29);
corr[0][j].coef[3] = (1 << 29);
}
for (i = 0; i < 4; i++)
info->initial[i] = info->axes[i];
}
/*
* js_an_probe_devs() probes for analog joysticks.
*/
static int __init js_an_probe_devs(struct js_an_info *info, int exist, int mask0, int mask1, struct js_port *port)
{
info->mask[0] = info->mask[1] = info->extensions = 0;
if (mask0 || mask1) {
info->mask[0] = mask0 & (exist | 0xf0);
info->mask[1] = mask1 & (exist | 0xf0) & ~info->mask[0];
info->extensions = (mask0 >> 8) & ((exist & JS_AN_HAT_FCS) | ((exist << 2) & JS_AN_BUTTONS_PXY_XY) |
((exist << 4) & JS_AN_BUTTONS_PXY_UV) | JS_AN_ANY_CHF);
if (info->extensions & JS_AN_BUTTONS_PXY) {
info->mask[0] &= ~((info->extensions & JS_AN_BUTTONS_PXY_XY) >> 2);
info->mask[0] &= ~((info->extensions & JS_AN_BUTTONS_PXY_UV) >> 4);
info->mask[1] = 0;
}
if (info->extensions & JS_AN_HAT_FCS) {
info->mask[0] &= ~JS_AN_HAT_FCS;
info->mask[1] = 0;
info->extensions &= ~(JS_AN_BUTTON_PXY_Y | JS_AN_BUTTON_PXY_U);
}
if (info->extensions & JS_AN_ANY_CHF) {
info->mask[0] |= 0xf0;
info->mask[1] = 0;
}
if (!(info->mask[0] | info->mask[1])) return -1;
} else {
switch (exist) {
case 0x0:
return -1;
case 0x3:
info->mask[0] = 0xf3; /* joystick 0, assuming 4-button */
break;
case 0xb:
info->mask[0] = 0xfb; /* 3-axis, 4-button joystick */
break;
case 0xc:
info->mask[0] = 0xcc; /* joystick 1 */
break;
case 0xf:
info->mask[0] = 0x33; /* joysticks 0 and 1 */
info->mask[1] = 0xcc;
break;
default:
printk(KERN_WARNING "joy-analog: Unknown joystick device detected "
"(data=%#x), contact <vojtech@suse.cz>\n", exist);
return -1;
}
}
return !!info->mask[0] + !!info->mask[1];
}
/*
* js_an_axes() returns the number of axes for an analog joystick.
*/
static inline int js_an_axes(int i, struct js_an_info *info)
{
return js_an_count_bits(info->mask[i] & 0x0f) + js_an_count_bits(info->extensions & JS_AN_HATS_ALL) * 2;
}
/*
* js_an_buttons() returns the number of buttons for an analog joystick.
*/
static inline int js_an_buttons(int i, struct js_an_info *info)
{
return js_an_count_bits(info->mask[i] & 0xf0) +
(info->extensions & JS_AN_BUTTONS_CHF) * 2 +
js_an_count_bits(info->extensions & JS_AN_BUTTONS_PXY);
}
/*
* js_an_name() constructs a name for an analog joystick.
*/
static char js_an_name_buf[128] __initdata = "";
static char __init *js_an_name(int i, struct js_an_info *info)
{
sprintf(js_an_name_buf, "Analog %d-axis %d-button",
js_an_count_bits(info->mask[i] & 0x0f),
js_an_buttons(i, info));
if (info->extensions & JS_AN_HATS_ALL)
sprintf(js_an_name_buf, "%s %d-hat",
js_an_name_buf,
js_an_count_bits(info->extensions & JS_AN_HATS_ALL));
strcat(js_an_name_buf, " joystick");
if (info->extensions)
sprintf(js_an_name_buf, "%s with%s%s%s extensions",
js_an_name_buf,
info->extensions & JS_AN_ANY_CHF ? " CHF" : "",
info->extensions & JS_AN_HAT_FCS ? " FCS" : "",
info->extensions & JS_AN_BUTTONS_PXY ? " XY-button" : "");
return js_an_name_buf;
}
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