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TOMOYO Linux Cross Reference
Linux/include/linux/gameport.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  *  Copyright (c) 1999-2002 Vojtech Pavlik
  4  */
  5 #ifndef _GAMEPORT_H
  6 #define _GAMEPORT_H
  7 
  8 #include <asm/io.h>
  9 #include <linux/types.h>
 10 #include <linux/list.h>
 11 #include <linux/mutex.h>
 12 #include <linux/device.h>
 13 #include <linux/timer.h>
 14 #include <linux/slab.h>
 15 #include <uapi/linux/gameport.h>
 16 
 17 struct gameport {
 18 
 19         void *port_data;        /* Private pointer for gameport drivers */
 20         char name[32];
 21         char phys[32];
 22 
 23         int io;
 24         int speed;
 25         int fuzz;
 26 
 27         void (*trigger)(struct gameport *);
 28         unsigned char (*read)(struct gameport *);
 29         int (*cooked_read)(struct gameport *, int *, int *);
 30         int (*calibrate)(struct gameport *, int *, int *);
 31         int (*open)(struct gameport *, int);
 32         void (*close)(struct gameport *);
 33 
 34         struct timer_list poll_timer;
 35         unsigned int poll_interval;     /* in msecs */
 36         spinlock_t timer_lock;
 37         unsigned int poll_cnt;
 38         void (*poll_handler)(struct gameport *);
 39 
 40         struct gameport *parent, *child;
 41 
 42         struct gameport_driver *drv;
 43         struct mutex drv_mutex;         /* protects serio->drv so attributes can pin driver */
 44 
 45         struct device dev;
 46 
 47         struct list_head node;
 48 };
 49 #define to_gameport_port(d)     container_of(d, struct gameport, dev)
 50 
 51 struct gameport_driver {
 52         const char *description;
 53 
 54         int (*connect)(struct gameport *, struct gameport_driver *drv);
 55         int (*reconnect)(struct gameport *);
 56         void (*disconnect)(struct gameport *);
 57 
 58         struct device_driver driver;
 59 
 60         bool ignore;
 61 };
 62 #define to_gameport_driver(d)   container_of(d, struct gameport_driver, driver)
 63 
 64 int gameport_open(struct gameport *gameport, struct gameport_driver *drv, int mode);
 65 void gameport_close(struct gameport *gameport);
 66 
 67 #if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))
 68 
 69 void __gameport_register_port(struct gameport *gameport, struct module *owner);
 70 /* use a define to avoid include chaining to get THIS_MODULE */
 71 #define gameport_register_port(gameport) \
 72         __gameport_register_port(gameport, THIS_MODULE)
 73 
 74 void gameport_unregister_port(struct gameport *gameport);
 75 
 76 __printf(2, 3)
 77 void gameport_set_phys(struct gameport *gameport, const char *fmt, ...);
 78 
 79 #else
 80 
 81 static inline void gameport_register_port(struct gameport *gameport)
 82 {
 83         return;
 84 }
 85 
 86 static inline void gameport_unregister_port(struct gameport *gameport)
 87 {
 88         return;
 89 }
 90 
 91 static inline __printf(2, 3)
 92 void gameport_set_phys(struct gameport *gameport, const char *fmt, ...)
 93 {
 94         return;
 95 }
 96 
 97 #endif
 98 
 99 static inline struct gameport *gameport_allocate_port(void)
100 {
101         struct gameport *gameport = kzalloc(sizeof(struct gameport), GFP_KERNEL);
102 
103         return gameport;
104 }
105 
106 static inline void gameport_free_port(struct gameport *gameport)
107 {
108         kfree(gameport);
109 }
110 
111 static inline void gameport_set_name(struct gameport *gameport, const char *name)
112 {
113         strlcpy(gameport->name, name, sizeof(gameport->name));
114 }
115 
116 /*
117  * Use the following functions to manipulate gameport's per-port
118  * driver-specific data.
119  */
120 static inline void *gameport_get_drvdata(struct gameport *gameport)
121 {
122         return dev_get_drvdata(&gameport->dev);
123 }
124 
125 static inline void gameport_set_drvdata(struct gameport *gameport, void *data)
126 {
127         dev_set_drvdata(&gameport->dev, data);
128 }
129 
130 /*
131  * Use the following functions to pin gameport's driver in process context
132  */
133 static inline int gameport_pin_driver(struct gameport *gameport)
134 {
135         return mutex_lock_interruptible(&gameport->drv_mutex);
136 }
137 
138 static inline void gameport_unpin_driver(struct gameport *gameport)
139 {
140         mutex_unlock(&gameport->drv_mutex);
141 }
142 
143 int __must_check __gameport_register_driver(struct gameport_driver *drv,
144                                 struct module *owner, const char *mod_name);
145 
146 /* use a define to avoid include chaining to get THIS_MODULE & friends */
147 #define gameport_register_driver(drv) \
148         __gameport_register_driver(drv, THIS_MODULE, KBUILD_MODNAME)
149 
150 void gameport_unregister_driver(struct gameport_driver *drv);
151 
152 /**
153  * module_gameport_driver() - Helper macro for registering a gameport driver
154  * @__gameport_driver: gameport_driver struct
155  *
156  * Helper macro for gameport drivers which do not do anything special in
157  * module init/exit. This eliminates a lot of boilerplate. Each module may
158  * only use this macro once, and calling it replaces module_init() and
159  * module_exit().
160  */
161 #define module_gameport_driver(__gameport_driver) \
162         module_driver(__gameport_driver, gameport_register_driver, \
163                        gameport_unregister_driver)
164 
165 
166 static inline void gameport_trigger(struct gameport *gameport)
167 {
168         if (gameport->trigger)
169                 gameport->trigger(gameport);
170         else
171                 outb(0xff, gameport->io);
172 }
173 
174 static inline unsigned char gameport_read(struct gameport *gameport)
175 {
176         if (gameport->read)
177                 return gameport->read(gameport);
178         else
179                 return inb(gameport->io);
180 }
181 
182 static inline int gameport_cooked_read(struct gameport *gameport, int *axes, int *buttons)
183 {
184         if (gameport->cooked_read)
185                 return gameport->cooked_read(gameport, axes, buttons);
186         else
187                 return -1;
188 }
189 
190 static inline int gameport_calibrate(struct gameport *gameport, int *axes, int *max)
191 {
192         if (gameport->calibrate)
193                 return gameport->calibrate(gameport, axes, max);
194         else
195                 return -1;
196 }
197 
198 static inline int gameport_time(struct gameport *gameport, int time)
199 {
200         return (time * gameport->speed) / 1000;
201 }
202 
203 static inline void gameport_set_poll_handler(struct gameport *gameport, void (*handler)(struct gameport *))
204 {
205         gameport->poll_handler = handler;
206 }
207 
208 static inline void gameport_set_poll_interval(struct gameport *gameport, unsigned int msecs)
209 {
210         gameport->poll_interval = msecs;
211 }
212 
213 void gameport_start_polling(struct gameport *gameport);
214 void gameport_stop_polling(struct gameport *gameport);
215 
216 #endif
217 

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