Atlas - SDL_sysjoystick_c.h
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
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
[FILE END]
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