/*

SDL - Simple DirectMedia Layer

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

This library 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

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with this library; if not, write to the Free

Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Sam Lantinga

slouken@devolution.com

*/

/*

* Joystick driver for the uhid(4) interface found in OpenBSD,

* NetBSD and FreeBSD.

*

* Maintainer: <vedge at csoft.org>

*/

#ifdef SAVE_RCSID

static char rcsid =

"@(#) $Id $";

#endif

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <string.h>

#include <errno.h>

#include <dev/usb/usb.h>

#include <dev/usb/usbhid.h>

#if defined(__FreeBSD__)

# include <libusb.h>

#else

# include <usbhid.h>

#endif

#include "SDL_error.h"

#include "SDL_joystick.h"

#include "SDL_sysjoystick.h"

#include "SDL_joystick_c.h"

#define MAX_UHID_JOYS 4

#define MAX_JOY_JOYS 2

#define MAX_JOYS (MAX_UHID_JOYS + MAX_JOY_JOYS)

struct report {

struct usb_ctl_report *buf; /* Buffer */

size_t size; /* Buffer size */

int rid; /* Report ID */

enum {

SREPORT_UNINIT,

SREPORT_CLEAN,

SREPORT_DIRTY

} status;

};

static struct {

int uhid_report;

enum hid_kind kind;

const char *name;

} const repinfo[] = {

{ UHID_INPUT_REPORT, hid_input, "input" },

{ UHID_OUTPUT_REPORT, hid_output, "output" },

{ UHID_FEATURE_REPORT, hid_feature, "feature" }

};

enum {

REPORT_INPUT = 0,

REPORT_OUTPUT = 1,

REPORT_FEATURE = 2

};

enum {

JOYAXE_X,

JOYAXE_Y,

JOYAXE_Z,

JOYAXE_SLIDER,

JOYAXE_WHEEL

};

struct joystick_hwdata {

int fd;

char *path;

enum {

BSDJOY_UHID, /* uhid(4) */

BSDJOY_JOY /* joy(4) */

} type;

struct report_desc *repdesc;

struct report inreport;

#if 0

int axismin[];

int axismax[];

#endif

};

static char *joynames[MAX_JOYS];

static char *joydevnames[MAX_JOYS];

static int report_alloc(struct report *, struct report_desc *, int);

static void report_free(struct report *);

int

SDL_SYS_JoystickInit(void)

{

char s[10];

int i, fd;

SDL_numjoysticks = 0;

memset(joynames, NULL, sizeof(joynames));

memset(joydevnames, NULL, sizeof(joydevnames));

for (i = 0; i < MAX_UHID_JOYS; i++) {

sprintf(s, "/dev/uhid%d", i);

fd = open(s, O_RDWR);

if (fd > 0) {

joynames[SDL_numjoysticks++] = strdup(s);

close(fd);

}

}

for (i = 0; i < MAX_JOY_JOYS; i++) {

sprintf(s, "/dev/joy%d", i);

fd = open(s, O_RDWR);

if (fd > 0) {

joynames[SDL_numjoysticks++] = strdup(s);

close(fd);

}

}

/* Read the default USB HID usage table. */

hid_init(NULL);

return (SDL_numjoysticks);

}

const char *

SDL_SYS_JoystickName(int index)

{

if (joydevnames[index] != NULL) {

return (joydevnames[index]);

}

return (joynames[index]);

}

int

SDL_SYS_JoystickOpen(SDL_Joystick *joy)

{

char *path = joynames[joy->index];

struct joystick_hwdata *hw;

struct hid_item hitem;

struct hid_data *hdata;

struct report *rep;

int fd;

fd = open(path, O_RDWR);

if (fd < 0) {

SDL_SetError("%s: %s", path, strerror(errno));

return (-1);

}

hw = (struct joystick_hwdata *)malloc(sizeof(struct joystick_hwdata));

if (hw == NULL) {

SDL_OutOfMemory();

close(fd);

return (-1);

}

joy->hwdata = hw;

hw->fd = fd;

hw->path = strdup(path);

hw->type = BSDJOY_UHID;

hw->repdesc = hid_get_report_desc(fd);

if (hw->repdesc == NULL) {

SDL_SetError("%s: USB_GET_REPORT_DESC: %s", hw->path,

strerror(errno));

goto usberr;

}

rep = &hw->inreport;

if (report_alloc(rep, hw->repdesc, REPORT_INPUT) < 0) {

goto usberr;

}

if (rep->size <= 0) {

SDL_SetError("%s: Input report descriptor has invalid length",

hw->path);

goto usberr;

}

hdata = hid_start_parse(hw->repdesc, 1 << hid_input);

if (hdata == NULL) {

SDL_SetError("%s: Cannot start HID parser", hw->path);

goto usberr;

}

joy->naxes = 0;

joy->nbuttons = 0;

joy->nhats = 0;

joy->nballs = 0;

while (hid_get_item(hdata, &hitem) > 0) {

char *sp;

const char *s;

switch (hitem.kind) {

case hid_collection:

switch (HID_PAGE(hitem.usage)) {

case HUP_GENERIC_DESKTOP:

switch (HID_USAGE(hitem.usage)) {

case HUG_JOYSTICK:

case HUG_GAME_PAD:

s = hid_usage_in_page(hitem.usage);

sp = malloc(strlen(s) + 5);

sprintf(sp, "%s (%d)", s,

joy->index);

joydevnames[joy->index] = sp;

}

}

break;

case hid_input:

switch (HID_PAGE(hitem.usage)) {

case HUP_UNDEFINED:

break;

case HUP_GENERIC_DESKTOP:

switch (HID_USAGE(hitem.usage)) {

case HUG_X:

case HUG_Y:

case HUG_Z:

case HUG_SLIDER:

case HUG_WHEEL:

#if 0

hw->axismin[joy->naxes] =

hitem.logical_minimum;

hw->axismax[joy->naxes] =

hitem.logical_maximum;

joy->naxes++;

break;

}

break;

case HUP_BUTTON:

joy->nbuttons++;

break;

}

break;

default:

break;

}

}

hid_end_parse(hdata);

/* The poll blocks the event thread. */

fcntl(fd, F_SETFL, O_NONBLOCK);

return (0);

usberr:

close(hw->fd);

free(hw->path);

free(hw);

return (-1);

}

void

SDL_SYS_JoystickUpdate(SDL_Joystick *joy)

{

static struct hid_item hitem;

static struct hid_data *hdata;

static struct report *rep;

rep = &joy->hwdata->inreport;

if (read(joy->hwdata->fd, rep->buf->data, rep->size) != rep->size) {

return;

}

hdata = hid_start_parse(joy->hwdata->repdesc, 1 << hid_input);

if (hdata == NULL) {

fprintf(stderr, "%s: Cannot start HID parser\n",

joy->hwdata->path);

return;

}

switch (hitem.kind) {

case hid_input:

switch (HID_PAGE(hitem.usage)) {

case HUP_UNDEFINED:

continue;

case HUP_GENERIC_DESKTOP:

switch (HID_USAGE(hitem.usage)) {

case HUG_X:

naxe = JOYAXE_X;

goto scaleaxe;

naxe = JOYAXE_Y;

goto scaleaxe;

naxe = JOYAXE_Z;

goto scaleaxe;

case HUG_SLIDER:

naxe = JOYAXE_SLIDER;

goto scaleaxe;

case HUG_WHEEL:

naxe = JOYAXE_WHEEL;

goto scaleaxe;

}

scaleaxe:

v = (Sint32)hid_get_data(rep->buf->data, &hitem);

if (v != 127) {

if (v < 127) {

v = -(256 - v);

v <<= 7;

v++;

} else {

v++;

v <<= 7;

v--;

} else {

v = 0;

}

if (v != joy->axes[naxe]) {

SDL_PrivateJoystickAxis(joy, naxe, v);

}

break;

case HUP_BUTTON:

v = (Sint32)hid_get_data(rep->buf->data,

&hitem);

if (joy->buttons[nbutton] != v) {

SDL_PrivateJoystickButton(joy,

nbutton, v);

}

nbutton++;

break;

}

break;

default:

break;

}

}

hid_end_parse(hdata);

return;

}

/* Function to close a joystick after use */

void

SDL_SYS_JoystickClose(SDL_Joystick *joy)

{

report_free(&joy->hwdata->inreport);

hid_dispose_report_desc(joy->hwdata->repdesc);

close(joy->hwdata->fd);

free(joy->hwdata->path);

free(joy->hwdata);

return;

}

void

SDL_SYS_JoystickQuit(void)

{

int i;

for (i = 0; i < MAX_JOYS; i++) {

if (joynames[i] != NULL)

free(joynames[i]);

if (joydevnames[i] != NULL)

free(joydevnames[i]);

}

return;

}

static int

report_alloc(struct report *r, struct report_desc *rd, int repind)

{

int len;

len = hid_report_size(rd, repinfo[repind].kind, &r->rid);

if (len < 0) {

SDL_SetError("Negative HID report size");

return (-1);

}

r->size = len;

if (r->size > 0) {

r->buf = malloc(sizeof(*r->buf) - sizeof(r->buf->data) +

r->size);

if (r->buf == NULL) {

SDL_OutOfMemory();

return (-1);

}

} else {

r->buf = NULL;

}

r->status = SREPORT_CLEAN;

return (0);

}

static void

report_free(struct report *r)

{

if (r->buf != NULL) {

free(r->buf);

}

r->status = SREPORT_UNINIT;

}