include/linux/gameport.h

   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