Skip to content

Commit

Permalink
Linux joystick cleanups from Alan Swanson
Browse files Browse the repository at this point in the history
  • Loading branch information
@slouken
slouken committed Dec 2, 2002
1 parent 2c3710c commit 10e38ab
Showing 1 changed file with 115 additions and 105 deletions.
220 changes: 115 additions & 105 deletions src/joystick/linux/SDL_sysjoystick.c
View file
Expand Up @@ -48,33 +48,24 @@ static char rcsid =
#include "SDL_sysjoystick.h"
#include "SDL_joystick_c.h"

/* Define this if you want to map axes to hats and trackballs */
#define FANCY_HATS_AND_BALLS

#ifdef FANCY_HATS_AND_BALLS
/* Special joystick configurations:
'JoystickName' Naxes Nhats Nballs
*/
static const char *special_joysticks[] = {
"'MadCatz Panther XL' 3 2 1", /* We don't handle a rudder (axis 8) */
"'SideWinder Precision Pro' 4 1 0",
"'SideWinder 3D Pro' 4 1 0",
"'Microsoft SideWinder 3D Pro' 4 1 0",
"'Microsoft SideWinder Dual Strike USB version 1.0' 2 1 0",
"'WingMan Interceptor' 3 3 0",
/* WingMan Extreme Analog - not recognized by default
"'Analog 3-axis 4-button joystick' 2 1 0",
*/
"'WingMan Extreme Digital 3D' 4 1 0",
"'Analog 2-axis 4-button 1-hat FCS joystick' 2 1 0",
"'Microsoft SideWinder Precision 2 Joystick' 4 1 0",
"'Logitech Inc. WingMan Extreme Digital 3D' 4 1 0",
"'Saitek Saitek X45' 6 1 0",
NULL
/* Special joystick configurations */
static struct {
const char *name;
int naxes;
int nhats;
int nballs;
} special_joysticks[] = {
{ "MadCatz Panther XL", 3, 2, 1 }, /* We don't handle rudder (axis 8) */
{ "SideWinder Precision Pro", 4, 1, 0 },
{ "SideWinder 3D Pro", 4, 1, 0 },
{ "Microsoft SideWinder 3D Pro", 4, 1, 0 },
{ "Microsoft SideWinder Dual Strike USB version 1.0", 2, 1, 0 },
{ "WingMan Interceptor", 3, 3, 0 },
{ "WingMan Extreme Digital 3D", 4, 1, 0 },
{ "Microsoft SideWinder Precision 2 Joystick", 4, 1, 0 },
{ "Logitech Inc. WingMan Extreme Digital 3D", 4, 1, 0 },
{ "Saitek Saitek X45", 6, 1, 0 }
};
#else
#undef USE_INPUT_EVENTS
#endif

/* The maximum number of joysticks we'll detect */
#define MAX_JOYSTICKS 32
Expand All @@ -96,8 +87,8 @@ struct joystick_hwdata {
} *balls;

/* Support for the Linux 2.4 unified input interface */
SDL_bool is_hid;
#ifdef USE_INPUT_EVENTS
SDL_bool is_hid;
Uint8 key_map[KEY_MAX-BTN_MISC];
Uint8 abs_map[ABS_MAX];
struct axis_correct {
Expand Down Expand Up @@ -146,14 +137,14 @@ int SDL_SYS_JoystickInit(void)
{
/* The base path of the joystick devices */
const char *joydev_pattern[] = {
"/dev/js%d",
#ifdef USE_INPUT_EVENTS
"/dev/input/event%d",
#endif
"/dev/input/js%d"
"/dev/input/js%d",
"/dev/js%d"
};
int numjoysticks;
int i, j, done;
int i, j;
int fd;
char path[PATH_MAX];
dev_t dev_nums[MAX_JOYSTICKS]; /* major/minor device numbers */
Expand All @@ -179,9 +170,9 @@ int SDL_SYS_JoystickInit(void)
}
}
}

for ( i=0; i<SDL_TABLESIZE(joydev_pattern); ++i ) {
done = 0;
for ( j=0; (j < MAX_JOYSTICKS) && !done; ++j ) {
for ( j=0; j < MAX_JOYSTICKS; ++j ) {
sprintf(path, joydev_pattern[i], j);

/* rcg06302000 replaced access(F_OK) call with stat().
Expand Down Expand Up @@ -210,7 +201,7 @@ int SDL_SYS_JoystickInit(void)
#ifdef DEBUG_INPUT_EVENTS
printf("Checking %s\n", path);
#endif
if ( (i > 0) && ! EV_IsJoystick(fd) ) {
if ( (i == 0) && ! EV_IsJoystick(fd) ) {
close(fd);
continue;
}
Expand All @@ -223,20 +214,23 @@ int SDL_SYS_JoystickInit(void)
dev_nums[numjoysticks] = sb.st_rdev;
++numjoysticks;
}
} else {
done = 1;
}
} else
break;
}
/* This is a special case...
If we're looking at the /dev/input event devices, and we found
at least one, then we don't want to look at the input joystick
devices, since they're built on top of devices that we've already
seen, so we're done.
*/
if ( i > 0 && j > 0 ) {
done = 1;
}

#ifdef USE_INPUT_EVENTS
/* This is a special case...
If the event devices are valid then the joystick devices
will be duplicates but without extra information about their
hats or balls. Unfortunately, the event devices can't
currently be calibrated, so it's a win-lose situation.
So : /dev/input/eventX = /dev/input/jsY = /dev/jsY
*/
if ( (i == 0) && (numjoysticks > 0) )
break;
#endif
}

return(numjoysticks);
}

Expand Down Expand Up @@ -264,8 +258,6 @@ const char *SDL_SYS_JoystickName(int index)
return name;
}

#ifdef FANCY_HATS_AND_BALLS

static int allocate_hatdata(SDL_Joystick *joystick)
{
int i;
Expand Down Expand Up @@ -298,34 +290,84 @@ static int allocate_balldata(SDL_Joystick *joystick)
return(0);
}

static SDL_bool ConfigJoystick(SDL_Joystick *joystick,
const char *name, const char *config)
static SDL_bool JS_ConfigJoystick(SDL_Joystick *joystick, int fd)
{
char cfg_name[128];
SDL_bool handled;
unsigned char n;
int old_axes, tmp_naxes, tmp_nhats, tmp_nballs;
const char *name;
char *env, env_name[128];
int i;

handled = SDL_FALSE;

if ( config == NULL ) {
return(SDL_FALSE);
/* Default joystick device settings */
if ( ioctl(fd, JSIOCGAXES, &n) < 0 ) {
joystick->naxes = 2;
} else {
joystick->naxes = n;
}
strcpy(cfg_name, "");
if ( *config == '\'' ) {
sscanf(config, "'%[^']s'", cfg_name);
config += strlen(cfg_name)+2;
if ( ioctl(fd, JSIOCGBUTTONS, &n) < 0 ) {
joystick->nbuttons = 2;
} else {
sscanf(config, "%s", cfg_name);
config += strlen(cfg_name);
joystick->nbuttons = n;
}
handled = SDL_FALSE;
if ( strcmp(cfg_name, name) == 0 ) {
/* Get the number of axes, hats and balls for this joystick */
int joystick_axes = joystick->naxes;
sscanf(config, "%d %d %d",
&joystick->naxes, &joystick->nhats, &joystick->nballs);

/* Allocate the extra data for mapping them */
name = SDL_SYS_JoystickName(joystick->index);
old_axes = joystick->naxes;

/* Generic analog joystick support */
if ( strstr(name, "Analog") == name && strstr(name, "-hat") ) {
if ( sscanf(name,"Analog %d-axis %*d-button %d-hat",
&tmp_naxes, &tmp_nhats) == 2 ) {

joystick->naxes = tmp_naxes;
joystick->nhats = tmp_nhats;

handled = SDL_TRUE;
}
}

/* Special joystick support */
for ( i=0; i < SDL_TABLESIZE(special_joysticks); ++i ) {
if ( strcmp(name, special_joysticks[i].name) == 0 ) {

joystick->naxes = special_joysticks[i].naxes;
joystick->nhats = special_joysticks[i].nhats;
joystick->nballs = special_joysticks[i].nballs;

handled = SDL_TRUE;
break;
}
}

/* User environment joystick support */
if ( (env = getenv("SDL_LINUX_JOYSTICK")) ) {
strcpy(env_name, "");
if ( *env == '\'' && sscanf(env, "'%[^']s'", env_name) == 1 )
env += strlen(env_name)+2;
else if ( sscanf(env, "%s", env_name) == 1 )
env += strlen(env_name);

if ( strcmp(name, env_name) == 0 ) {

if ( sscanf(env, "%d %d %d", &tmp_naxes, &tmp_nhats,
&tmp_nballs) == 3 ) {

joystick->naxes = tmp_naxes;
joystick->nhats = tmp_nhats;
joystick->nballs = tmp_nballs;

handled = SDL_TRUE;
}
}
}

/* Remap hats and balls */
if (handled) {
if ( joystick->nhats > 0 ) {
/* HACK: Analog hats map to only one axis */
if (joystick_axes == (joystick->naxes+joystick->nhats)){
if (old_axes == (joystick->naxes+joystick->nhats)){
joystick->hwdata->analog_hat = 1;
} else {
if ( allocate_hatdata(joystick) < 0 ) {
Expand All @@ -339,8 +381,8 @@ static SDL_bool ConfigJoystick(SDL_Joystick *joystick,
joystick->nballs = 0;
}
}
handled = SDL_TRUE;
}

return(handled);
}

Expand Down Expand Up @@ -440,21 +482,14 @@ static SDL_bool EV_ConfigJoystick(SDL_Joystick *joystick, int fd)

#endif /* USE_INPUT_EVENTS */

#endif /* FANCY_HATS_AND_BALLS */

/* Function to open a joystick for use.
The joystick to open is specified by the index field of the joystick.
This should fill the nbuttons and naxes fields of the joystick structure.
It returns 0, or -1 if there is an error.
*/
int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
{
#ifdef FANCY_HATS_AND_BALLS
const char *name;
int i;
#endif
int fd;
unsigned char n;

/* Open the joystick and set the joystick file descriptor */
fd = open(SDL_joylist[joystick->index], O_RDONLY, 0);
Expand All @@ -480,31 +515,8 @@ int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
#ifdef USE_INPUT_EVENTS
if ( ! EV_ConfigJoystick(joystick, fd) )
#endif
{
if ( ioctl(fd, JSIOCGAXES, &n) < 0 ) {
joystick->naxes = 2;
} else {
joystick->naxes = n;
}
if ( ioctl(fd, JSIOCGBUTTONS, &n) < 0 ) {
joystick->nbuttons = 2;
} else {
joystick->nbuttons = n;
}
#ifdef FANCY_HATS_AND_BALLS
/* Check for special joystick support */
name = SDL_SYS_JoystickName(joystick->index);
for ( i=0; special_joysticks[i]; ++i ) {
if (ConfigJoystick(joystick,name,special_joysticks[i])){
break;
}
}
if ( special_joysticks[i] == NULL ) {
ConfigJoystick(joystick, name,
getenv("SDL_LINUX_JOYSTICK"));
}
#endif /* FANCY_HATS_AND_BALLS */
}
JS_ConfigJoystick(joystick, fd);

return(0);
}

Expand Down Expand Up @@ -631,13 +643,11 @@ static __inline__ int EV_AxisCorrect(SDL_Joystick *joystick, int which, int valu
value *= correct->coef[2];
value >>= 14;
}

/* Clamp and return */
if ( value < -32767 ) {
value = -32767;
} else
if ( value > 32767 ) {
value = 32767;
}
if ( value < -32767 ) return -32767;
if ( value > 32767 ) return 32767;

return value;
}

Expand Down

0 comments on commit 10e38ab

Please sign in to comment.