| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org> |
| Copyright (C) 2020 Collabora Ltd. |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| |
| #include "SDL_evdev_capabilities.h" |
| |
| #if HAVE_LIBUDEV_H || defined(SDL_JOYSTICK_LINUX) |
| |
| /* missing defines in older Linux kernel headers */ |
| #ifndef BTN_TRIGGER_HAPPY |
| #define BTN_TRIGGER_HAPPY 0x2c0 |
| #endif |
| #ifndef BTN_DPAD_UP |
| #define BTN_DPAD_UP 0x220 |
| #endif |
| #ifndef KEY_ALS_TOGGLE |
| #define KEY_ALS_TOGGLE 0x230 |
| #endif |
| |
| extern int |
| SDL_EVDEV_GuessDeviceClass(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)]) |
| { |
| struct range { |
| unsigned start; |
| unsigned end; |
| }; |
| |
| /* key code ranges above BTN_MISC (start is inclusive, stop is exclusive)*/ |
| static const struct range high_key_blocks[] = { |
| { KEY_OK, BTN_DPAD_UP }, |
| { KEY_ALS_TOGGLE, BTN_TRIGGER_HAPPY } |
| }; |
| |
| int devclass = 0; |
| unsigned long keyboard_mask; |
| |
| /* X, Y, Z axes but no buttons probably means an accelerometer */ |
| if (test_bit(EV_ABS, bitmask_ev) && |
| test_bit(ABS_X, bitmask_abs) && |
| test_bit(ABS_Y, bitmask_abs) && |
| test_bit(ABS_Z, bitmask_abs) && |
| !test_bit(EV_KEY, bitmask_ev)) { |
| return SDL_UDEV_DEVICE_ACCELEROMETER; |
| } |
| |
| /* RX, RY, RZ axes but no buttons also probably means an accelerometer */ |
| if (test_bit(EV_ABS, bitmask_ev) && |
| test_bit(ABS_RX, bitmask_abs) && |
| test_bit(ABS_RY, bitmask_abs) && |
| test_bit(ABS_RZ, bitmask_abs) && |
| !test_bit(EV_KEY, bitmask_ev)) { |
| return SDL_UDEV_DEVICE_ACCELEROMETER; |
| } |
| |
| 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 */ |
| } |
| |
| if (test_bit(EV_KEY, bitmask_ev)) { |
| unsigned i; |
| unsigned long found = 0; |
| |
| for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i) { |
| found |= bitmask_key[i]; |
| } |
| /* If there are no keys in the lower block, check the higher blocks */ |
| if (!found) { |
| unsigned block; |
| for (block = 0; block < (sizeof(high_key_blocks) / sizeof(struct range)); ++block) { |
| for (i = high_key_blocks[block].start; i < high_key_blocks[block].end; ++i) { |
| if (test_bit(i, bitmask_key)) { |
| found = 1; |
| break; |
| } |
| } |
| } |
| } |
| |
| if (found > 0) { |
| devclass |= SDL_UDEV_DEVICE_KEYBOARD; /* ID_INPUT_KEY */ |
| } |
| } |
| |
| /* 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; |
| } |
| |
| #endif |