1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20*/
21
22#ifndef SDL_sysjoystick_c_h_
23#define SDL_sysjoystick_c_h_
24
25#include <linux/input.h>
26
27struct SDL_joylist_item;
28struct SDL_sensorlist_item;
29
30// The private structure used to keep track of a joystick
31struct joystick_hwdata
32{
33 int fd;
34 // linux driver creates a separate device for gyro/accelerometer
35 int fd_sensor;
36 struct SDL_joylist_item *item;
37 struct SDL_sensorlist_item *item_sensor;
38 SDL_GUID guid;
39 char *fname; // Used in haptic subsystem
40
41 bool ff_rumble;
42 bool ff_sine;
43 struct ff_effect effect;
44 Uint32 effect_expiration;
45
46 // The current Linux joystick driver maps balls to two axes
47 struct hwdata_ball
48 {
49 int axis[2];
50 } *balls;
51
52 // The current Linux joystick driver maps hats to two axes
53 struct hwdata_hat
54 {
55 int axis[2];
56 } *hats;
57
58 // Support for the Linux 2.4 unified input interface
59 Uint8 key_map[KEY_MAX];
60 Uint8 abs_map[ABS_MAX];
61 bool has_key[KEY_MAX];
62 bool has_abs[ABS_MAX];
63 bool has_accelerometer;
64 bool has_gyro;
65
66 // Support for the classic joystick interface
67 bool classic;
68 Uint16 *key_pam;
69 Uint8 *abs_pam;
70
71 struct axis_correct
72 {
73 bool use_deadzones;
74
75 // Deadzone coefficients
76 int coef[3];
77
78 // Raw coordinate scale
79 int minimum;
80 int maximum;
81 float scale;
82 } abs_correct[ABS_MAX];
83
84 float accelerometer_scale[3];
85 float gyro_scale[3];
86
87 /* Each axis is read independently, if we don't get all axis this call to
88 * LINUX_JoystickUpdateupdate(), store them for the next one */
89 float gyro_data[3];
90 float accel_data[3];
91 Uint64 sensor_tick;
92 Sint32 last_tick;
93
94 bool report_sensor;
95 bool fresh;
96 bool recovering_from_dropped;
97 bool recovering_from_dropped_sensor;
98
99 // Steam Controller support
100 bool m_bSteamController;
101
102 // 4 = (ABS_HAT3X-ABS_HAT0X)/2 (see input-event-codes.h in kernel)
103 int hats_indices[4];
104 bool has_hat[4];
105 struct hat_axis_correct
106 {
107 bool use_deadzones;
108 int minimum[2];
109 int maximum[2];
110 } hat_correct[4];
111
112 // Set when gamepad is pending removal due to ENODEV read error
113 bool gone;
114 bool sensor_gone;
115};
116
117#endif // SDL_sysjoystick_c_h_
118