Atlas - SDL_evdev_capabilities.c
Home / ext / SDL / src / core / linux Lines: 1 | Size: 6248 bytes [Download] [Show on GitHub] [Search similar files] [Raw] [Raw (proxy)][FILE BEGIN]1/* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2025 Sam Lantinga <[email protected]> 4 Copyright (C) 2020 Collabora Ltd. 5 6 This software is provided 'as-is', without any express or implied 7 warranty. In no event will the authors be held liable for any damages 8 arising from the use of this software. 9 10 Permission is granted to anyone to use this software for any purpose, 11 including commercial applications, and to alter it and redistribute it 12 freely, subject to the following restrictions: 13 14 1. The origin of this software must not be misrepresented; you must not 15 claim that you wrote the original software. If you use this software 16 in a product, an acknowledgment in the product documentation would be 17 appreciated but is not required. 18 2. Altered source versions must be plainly marked as such, and must not be 19 misrepresented as being the original software. 20 3. This notice may not be removed or altered from any source distribution. 21*/ 22#include "SDL_internal.h" 23 24#include "SDL_evdev_capabilities.h" 25 26#ifdef HAVE_LINUX_INPUT_H 27 28// missing defines in older Linux kernel headers 29#ifndef BTN_TRIGGER_HAPPY 30#define BTN_TRIGGER_HAPPY 0x2c0 31#endif 32#ifndef BTN_DPAD_UP 33#define BTN_DPAD_UP 0x220 34#endif 35#ifndef KEY_ALS_TOGGLE 36#define KEY_ALS_TOGGLE 0x230 37#endif 38 39extern int 40SDL_EVDEV_GuessDeviceClass(const unsigned long bitmask_props[NBITS(INPUT_PROP_MAX)], 41 const unsigned long bitmask_ev[NBITS(EV_MAX)], 42 const unsigned long bitmask_abs[NBITS(ABS_MAX)], 43 const unsigned long bitmask_key[NBITS(KEY_MAX)], 44 const unsigned long bitmask_rel[NBITS(REL_MAX)]) 45{ 46 struct range 47 { 48 unsigned start; 49 unsigned end; 50 }; 51 52 // key code ranges above BTN_MISC (start is inclusive, stop is exclusive) 53 static const struct range high_key_blocks[] = { 54 { KEY_OK, BTN_DPAD_UP }, 55 { KEY_ALS_TOGGLE, BTN_TRIGGER_HAPPY } 56 }; 57 58 int devclass = 0; 59 unsigned long keyboard_mask; 60 61 // If the kernel specifically says it's an accelerometer, believe it 62 if (test_bit(INPUT_PROP_ACCELEROMETER, bitmask_props)) { 63 return SDL_UDEV_DEVICE_ACCELEROMETER; 64 } 65 66 // We treat pointing sticks as indistinguishable from mice 67 if (test_bit(INPUT_PROP_POINTING_STICK, bitmask_props)) { 68 return SDL_UDEV_DEVICE_MOUSE; 69 } 70 71 // We treat buttonpads as equivalent to touchpads 72 if (test_bit(INPUT_PROP_TOPBUTTONPAD, bitmask_props) || 73 test_bit(INPUT_PROP_BUTTONPAD, bitmask_props) || 74 test_bit(INPUT_PROP_SEMI_MT, bitmask_props)) { 75 return SDL_UDEV_DEVICE_TOUCHPAD; 76 } 77 78 // X, Y, Z axes but no buttons probably means an accelerometer 79 if (test_bit(EV_ABS, bitmask_ev) && 80 test_bit(ABS_X, bitmask_abs) && 81 test_bit(ABS_Y, bitmask_abs) && 82 test_bit(ABS_Z, bitmask_abs) && 83 !test_bit(EV_KEY, bitmask_ev)) { 84 return SDL_UDEV_DEVICE_ACCELEROMETER; 85 } 86 87 /* RX, RY, RZ axes but no buttons probably means a gyro or 88 * accelerometer (we don't distinguish) */ 89 if (test_bit(EV_ABS, bitmask_ev) && 90 test_bit(ABS_RX, bitmask_abs) && 91 test_bit(ABS_RY, bitmask_abs) && 92 test_bit(ABS_RZ, bitmask_abs) && 93 !test_bit(EV_KEY, bitmask_ev)) { 94 return SDL_UDEV_DEVICE_ACCELEROMETER; 95 } 96 97 if (test_bit(EV_ABS, bitmask_ev) && 98 test_bit(ABS_X, bitmask_abs) && test_bit(ABS_Y, bitmask_abs)) { 99 if (test_bit(BTN_STYLUS, bitmask_key) || test_bit(BTN_TOOL_PEN, bitmask_key)) { 100 ; // ID_INPUT_TABLET 101 } else if (test_bit(BTN_TOOL_FINGER, bitmask_key) && !test_bit(BTN_TOOL_PEN, bitmask_key)) { 102 devclass |= SDL_UDEV_DEVICE_TOUCHPAD; // ID_INPUT_TOUCHPAD 103 } else if (test_bit(BTN_MOUSE, bitmask_key)) { 104 devclass |= SDL_UDEV_DEVICE_MOUSE; // ID_INPUT_MOUSE 105 } else if (test_bit(BTN_TOUCH, bitmask_key)) { 106 /* TODO: better determining between touchscreen and multitouch touchpad, 107 see https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-input_id.c */ 108 devclass |= SDL_UDEV_DEVICE_TOUCHSCREEN; // ID_INPUT_TOUCHSCREEN 109 } 110 111 if (test_bit(BTN_TRIGGER, bitmask_key) || 112 test_bit(BTN_A, bitmask_key) || 113 test_bit(BTN_1, bitmask_key) || 114 test_bit(ABS_RX, bitmask_abs) || 115 test_bit(ABS_RY, bitmask_abs) || 116 test_bit(ABS_RZ, bitmask_abs) || 117 test_bit(ABS_THROTTLE, bitmask_abs) || 118 test_bit(ABS_RUDDER, bitmask_abs) || 119 test_bit(ABS_WHEEL, bitmask_abs) || 120 test_bit(ABS_GAS, bitmask_abs) || 121 test_bit(ABS_BRAKE, bitmask_abs)) { 122 devclass |= SDL_UDEV_DEVICE_JOYSTICK; // ID_INPUT_JOYSTICK 123 } 124 } 125 126 if (test_bit(EV_REL, bitmask_ev) && 127 test_bit(REL_X, bitmask_rel) && test_bit(REL_Y, bitmask_rel) && 128 test_bit(BTN_MOUSE, bitmask_key)) { 129 devclass |= SDL_UDEV_DEVICE_MOUSE; // ID_INPUT_MOUSE 130 } 131 132 if (test_bit(EV_KEY, bitmask_ev)) { 133 unsigned i; 134 unsigned long found = 0; 135 136 for (i = 0; i < BTN_MISC / BITS_PER_LONG; ++i) { 137 found |= bitmask_key[i]; 138 } 139 // If there are no keys in the lower block, check the higher blocks 140 if (!found) { 141 unsigned block; 142 for (block = 0; block < (sizeof(high_key_blocks) / sizeof(struct range)); ++block) { 143 for (i = high_key_blocks[block].start; i < high_key_blocks[block].end; ++i) { 144 if (test_bit(i, bitmask_key)) { 145 found = 1; 146 break; 147 } 148 } 149 } 150 } 151 152 if (found > 0) { 153 devclass |= SDL_UDEV_DEVICE_HAS_KEYS; // ID_INPUT_KEY 154 } 155 } 156 157 /* the first 32 bits are ESC, numbers, and Q to D, so if we have all of 158 * those, consider it to be a fully-featured keyboard; 159 * do not test KEY_RESERVED, though */ 160 keyboard_mask = 0xFFFFFFFE; 161 if ((bitmask_key[0] & keyboard_mask) == keyboard_mask) { 162 devclass |= SDL_UDEV_DEVICE_KEYBOARD; // ID_INPUT_KEYBOARD 163 } 164 165 return devclass; 166} 167 168#endif // HAVE_LINUX_INPUT_H 169[FILE END](C) 2025 0x4248 (C) 2025 4248 Media and 4248 Systems, All part of 0x4248 See LICENCE files for more information. 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