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evdev: Detect whether input devices are accelerometers
Anything with X, Y and Z axes but no buttons is probably an accelerometer (this is the assumption made in udev). Signed-off-by: Simon McVittie <smcv@collabora.com>
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@ -33,6 +33,24 @@ SDL_EVDEV_GuessDeviceClass(unsigned long bitmask_ev[NBITS(EV_MAX)],
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int devclass = 0;
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unsigned long keyboard_mask;
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/* X, Y, Z axes but no buttons probably means an accelerometer */
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if (test_bit(EV_ABS, bitmask_ev) &&
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test_bit(ABS_X, bitmask_abs) &&
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test_bit(ABS_Y, bitmask_abs) &&
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test_bit(ABS_Z, bitmask_abs) &&
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!test_bit(EV_KEY, bitmask_ev)) {
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return SDL_UDEV_DEVICE_ACCELEROMETER;
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}
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/* RX, RY, RZ axes but no buttons also probably means an accelerometer */
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if (test_bit(EV_ABS, bitmask_ev) &&
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test_bit(ABS_RX, bitmask_abs) &&
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test_bit(ABS_RY, bitmask_abs) &&
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test_bit(ABS_RZ, bitmask_abs) &&
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!test_bit(EV_KEY, bitmask_ev)) {
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return SDL_UDEV_DEVICE_ACCELEROMETER;
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}
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if (test_bit(EV_ABS, bitmask_ev) &&
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test_bit(ABS_X, bitmask_abs) && test_bit(ABS_Y, bitmask_abs)) {
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if (test_bit(BTN_STYLUS, bitmask_key) || test_bit(BTN_TOOL_PEN, bitmask_key)) {
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@ -37,7 +37,8 @@ typedef enum
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SDL_UDEV_DEVICE_KEYBOARD = 0x0002,
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SDL_UDEV_DEVICE_JOYSTICK = 0x0004,
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SDL_UDEV_DEVICE_SOUND = 0x0008,
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SDL_UDEV_DEVICE_TOUCHSCREEN = 0x0010
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SDL_UDEV_DEVICE_TOUCHSCREEN = 0x0010,
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SDL_UDEV_DEVICE_ACCELEROMETER = 0x0020
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} SDL_UDEV_deviceclass;
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#define BITS_PER_LONG (sizeof(unsigned long) * 8)
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