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linux: If the kernel specifically tells us the device type, trust it

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If a device is positively identified as an accelerometer, pointing stick
or clickpad, then we don't need to second-guess it.

In practice this does not change the result for any device in our
test data, so add some artificial records that exercise this.

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2023-06-16 15:16:44 +01:00 committed by Sam Lantinga
parent 0d5aa70e62
commit d584592822
2 changed files with 48 additions and 1 deletions
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19
src/core/linux/SDL_evdev_capabilities.c
View File

@ -58,6 +58,22 @@ SDL_EVDEV_GuessDeviceClass(const unsigned long bitmask_props[NBITS(INPUT_PROP_MA
int devclass = 0;
unsigned long keyboard_mask;
/* If the kernel specifically says it's an accelerometer, believe it */
if (test_bit(INPUT_PROP_ACCELEROMETER, bitmask_props)) {
return SDL_UDEV_DEVICE_ACCELEROMETER;
}
/* We treat pointing sticks as indistinguishable from mice */
if (test_bit(INPUT_PROP_POINTING_STICK, bitmask_props)) {
return SDL_UDEV_DEVICE_MOUSE;
}
/* We treat buttonpads as equivalent to touchpads */
if (test_bit(INPUT_PROP_TOPBUTTONPAD, bitmask_props) ||
test_bit(INPUT_PROP_BUTTONPAD, bitmask_props)) {
return SDL_UDEV_DEVICE_TOUCHPAD;
}
/* X, Y, Z axes but no buttons probably means an accelerometer */
if (test_bit(EV_ABS, bitmask_ev) &&
test_bit(ABS_X, bitmask_abs) &&
@ -67,7 +83,8 @@ SDL_EVDEV_GuessDeviceClass(const unsigned long bitmask_props[NBITS(INPUT_PROP_MA
return SDL_UDEV_DEVICE_ACCELEROMETER;
}
/* RX, RY, RZ axes but no buttons also probably means an accelerometer */
/* RX, RY, RZ axes but no buttons probably means a gyro or
* accelerometer (we don't distinguish) */
if (test_bit(EV_ABS, bitmask_ev) &&
test_bit(ABS_RX, bitmask_abs) &&
test_bit(ABS_RY, bitmask_abs) &&

30
test/testevdev.c
View File

@ -1758,6 +1758,36 @@ static const GuessTest guess_tests[] =
.hid_report_descriptor_length = sizeof (fanatec_handbrake_hid_report_descriptor),
.hid_report_descriptor = &fanatec_handbrake_hid_report_descriptor[0],
},
{ /* Artificial test data, not a real device */
.name = "Fake accelerometer with fewer than usual axes reported",
.expected = SDL_UDEV_DEVICE_ACCELEROMETER,
/* SYN, ABS */
.ev = { 0x09 },
/* X only */
.abs = { 0x01 },
/* ACCELEROMETER */
.props = { 0x40 },
},
{ /* Artificial test data, not a real device */
.name = "Fake pointing stick with no buttons",
.expected = SDL_UDEV_DEVICE_MOUSE,
/* SYN, REL */
.ev = { 0x05 },
/* X,Y */
.rel = { 0x03 },
/* POINTER, POINTING_STICK */
.props = { 0x21 },
},
{ /* Artificial test data, not a real device */
.name = "Fake buttonpad",
.expected = SDL_UDEV_DEVICE_TOUCHPAD,
/* SYN, ABS */
.ev = { 0x09 },
/* X,Y */
.abs = { 0x03 },
/* POINTER, BUTTONPAD */
.props = { 0x05 },
},
{
.name = "No information",
.expected = SDL_UDEV_DEVICE_UNKNOWN,