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Fixed bug 4665 - Add support for single touch evdev devices
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Jan Martin Mikkelsen

The attached patch adds support for single-touch evdev devices.

These devices report ABS_X, ABS_Y and BTN_TOUCH events. This patch sets them up as MT devices with a single slot and handles the appropriate messages.
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@slouken
slouken committed Jun 12, 2019
1 parent 797b281 commit d01150a
Showing 1 changed file with 38 additions and 16 deletions.
54 changes: 38 additions & 16 deletions src/core/linux/SDL_evdev.c
View file
Expand Up @@ -272,6 +272,12 @@ SDL_EVDEV_Poll(void)
position is sent in EV_ABS ABS_X/ABS_Y, switching to
next finger after earlist is released) */
if (item->is_touchscreen && events[i].code == BTN_TOUCH) {
if (item->touchscreen_data->max_slots == 1) {
if (events[i].value)
item->touchscreen_data->slots[0].delta = EVDEV_TOUCH_SLOTDELTA_DOWN;
else
item->touchscreen_data->slots[0].delta = EVDEV_TOUCH_SLOTDELTA_UP;
}
break;
}

Expand Down Expand Up @@ -328,14 +334,20 @@ SDL_EVDEV_Poll(void)
}
break;
case ABS_X:
if (item->is_touchscreen) /* FIXME: temp hack */
break;
SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, events[i].value, mouse->y);
if (item->is_touchscreen) {
if (item->touchscreen_data->max_slots != 1)
break;
item->touchscreen_data->slots[0].x = events[i].value;
} else
SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, events[i].value, mouse->y);
break;
case ABS_Y:
if (item->is_touchscreen) /* FIXME: temp hack */
break;
SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, mouse->x, events[i].value);
if (item->is_touchscreen) {
if (item->touchscreen_data->max_slots != 1)
break;
item->touchscreen_data->slots[0].y = events[i].value;
} else
SDL_SendMouseMotion(mouse->focus, mouse->mouseID, SDL_FALSE, mouse->x, events[i].value);
break;
default:
break;
Expand Down Expand Up @@ -444,6 +456,7 @@ static int
SDL_EVDEV_init_touchscreen(SDL_evdevlist_item* item)
{
int ret, i;
unsigned long xreq, yreq;
char name[64];
struct input_absinfo abs_info;

Expand All @@ -466,7 +479,24 @@ SDL_EVDEV_init_touchscreen(SDL_evdevlist_item* item)
return SDL_OutOfMemory();
}

ret = ioctl(item->fd, EVIOCGABS(ABS_MT_POSITION_X), &abs_info);
ret = ioctl(item->fd, EVIOCGABS(ABS_MT_SLOT), &abs_info);
if (ret < 0) {
SDL_free(item->touchscreen_data->name);
SDL_free(item->touchscreen_data);
return SDL_SetError("Failed to get evdev touchscreen limits");
}

if (abs_info.maximum == 0) {
item->touchscreen_data->max_slots = 1;
xreq = EVIOCGABS(ABS_X);
yreq = EVIOCGABS(ABS_Y);
} else {
item->touchscreen_data->max_slots = abs_info.maximum + 1;
xreq = EVIOCGABS(ABS_MT_POSITION_X);
yreq = EVIOCGABS(ABS_MT_POSITION_Y);
}

ret = ioctl(item->fd, xreq, &abs_info);
if (ret < 0) {
SDL_free(item->touchscreen_data->name);
SDL_free(item->touchscreen_data);
Expand All @@ -476,7 +506,7 @@ SDL_EVDEV_init_touchscreen(SDL_evdevlist_item* item)
item->touchscreen_data->max_x = abs_info.maximum;
item->touchscreen_data->range_x = abs_info.maximum - abs_info.minimum;

ret = ioctl(item->fd, EVIOCGABS(ABS_MT_POSITION_Y), &abs_info);
ret = ioctl(item->fd, yreq, &abs_info);
if (ret < 0) {
SDL_free(item->touchscreen_data->name);
SDL_free(item->touchscreen_data);
Expand All @@ -496,14 +526,6 @@ SDL_EVDEV_init_touchscreen(SDL_evdevlist_item* item)
item->touchscreen_data->max_pressure = abs_info.maximum;
item->touchscreen_data->range_pressure = abs_info.maximum - abs_info.minimum;

ret = ioctl(item->fd, EVIOCGABS(ABS_MT_SLOT), &abs_info);
if (ret < 0) {
SDL_free(item->touchscreen_data->name);
SDL_free(item->touchscreen_data);
return SDL_SetError("Failed to get evdev touchscreen limits");
}
item->touchscreen_data->max_slots = abs_info.maximum + 1;

item->touchscreen_data->slots = SDL_calloc(
item->touchscreen_data->max_slots,
sizeof(*item->touchscreen_data->slots));
Expand Down

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