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udev: Factor out SDL_EVDEV_GuessDeviceClass

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This works on capability bitfields that can either come from udev or
from ioctls, so it is equally applicable to both udev and non-udev
input device detection.

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2020-11-11 19:14:34 -08:00
parent 13e7d1a958
commit 8db3171b98
10 changed files with 153 additions and 69 deletions
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55
src/core/linux/SDL_udev.c
View file

@ -32,6 +32,7 @@
#include <linux/input.h>
#include "SDL_assert.h"
#include "SDL_evdev_capabilities.h"
#include "SDL_loadso.h"
#include "SDL_timer.h"
#include "SDL_hints.h"
@ -291,12 +292,6 @@ SDL_UDEV_LoadLibrary(void)
return retval;
}
#define BITS_PER_LONG (sizeof(unsigned long) * 8)
#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
#define OFF(x) ((x)%BITS_PER_LONG)
#define LONG(x) ((x)/BITS_PER_LONG)
#define test_bit(bit, array) ((array[LONG(bit)] >> OFF(bit)) & 1)
static void get_caps(struct udev_device *dev, struct udev_device *pdev, const char *attr, unsigned long *bitmask, size_t bitmask_len)
{
const char *value;
@ -330,13 +325,11 @@ static void get_caps(struct udev_device *dev, struct udev_device *pdev, const ch
static int
guess_device_class(struct udev_device *dev)
{
int devclass = 0;
struct udev_device *pdev;
unsigned long bitmask_ev[NBITS(EV_MAX)];
unsigned long bitmask_abs[NBITS(ABS_MAX)];
unsigned long bitmask_key[NBITS(KEY_MAX)];
unsigned long bitmask_rel[NBITS(REL_MAX)];
unsigned long keyboard_mask;
/* walk up the parental chain until we find the real input device; the
* argument is very likely a subdevice of this, like eventN */
@ -353,48 +346,10 @@ guess_device_class(struct udev_device *dev)
get_caps(dev, pdev, "capabilities/rel", bitmask_rel, SDL_arraysize(bitmask_rel));
get_caps(dev, pdev, "capabilities/key", bitmask_key, SDL_arraysize(bitmask_key));
if (test_bit(EV_ABS, bitmask_ev) &&
test_bit(ABS_X, bitmask_abs) && test_bit(ABS_Y, bitmask_abs)) {
if (test_bit(BTN_STYLUS, bitmask_key) || test_bit(BTN_TOOL_PEN, bitmask_key)) {
; /* ID_INPUT_TABLET */
} else if (test_bit(BTN_TOOL_FINGER, bitmask_key) && !test_bit(BTN_TOOL_PEN, bitmask_key)) {
; /* ID_INPUT_TOUCHPAD */
} else if (test_bit(BTN_MOUSE, bitmask_key)) {
devclass |= SDL_UDEV_DEVICE_MOUSE; /* ID_INPUT_MOUSE */
} else if (test_bit(BTN_TOUCH, bitmask_key)) {
/* TODO: better determining between touchscreen and multitouch touchpad,
see https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-input_id.c */
devclass |= SDL_UDEV_DEVICE_TOUCHSCREEN; /* ID_INPUT_TOUCHSCREEN */
}
if (test_bit(BTN_TRIGGER, bitmask_key) ||
test_bit(BTN_A, bitmask_key) ||
test_bit(BTN_1, bitmask_key) ||
test_bit(ABS_RX, bitmask_abs) ||
test_bit(ABS_RY, bitmask_abs) ||
test_bit(ABS_RZ, bitmask_abs) ||
test_bit(ABS_THROTTLE, bitmask_abs) ||
test_bit(ABS_RUDDER, bitmask_abs) ||
test_bit(ABS_WHEEL, bitmask_abs) ||
test_bit(ABS_GAS, bitmask_abs) ||
test_bit(ABS_BRAKE, bitmask_abs)) {
devclass |= SDL_UDEV_DEVICE_JOYSTICK; /* ID_INPUT_JOYSTICK */
}
}
if (test_bit(EV_REL, bitmask_ev) &&
test_bit(REL_X, bitmask_rel) && test_bit(REL_Y, bitmask_rel) &&
test_bit(BTN_MOUSE, bitmask_key)) {
devclass |= SDL_UDEV_DEVICE_MOUSE; /* ID_INPUT_MOUSE */
}
/* the first 32 bits are ESC, numbers, and Q to D; if we have any of
* those, consider it a keyboard device; do not test KEY_RESERVED, though */
keyboard_mask = 0xFFFFFFFE;
if ((bitmask_key[0] & keyboard_mask) != 0)
devclass |= SDL_UDEV_DEVICE_KEYBOARD; /* ID_INPUT_KEYBOARD */
return devclass;
return SDL_EVDEV_GuessDeviceClass(&bitmask_ev[0],
&bitmask_abs[0],
&bitmask_key[0],
&bitmask_rel[0]);
}
static void