include/linux/serio.h

   1 /*
   2  * Copyright (C) 1999-2002 Vojtech Pavlik
   3 *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  */
   8 #ifndef _SERIO_H
   9 #define _SERIO_H
  10
  11
  12 #include <linux/types.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/list.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/mutex.h>
  17 #include <linux/device.h>
  18 #include <linux/mod_devicetable.h>
  19 #include <uapi/linux/serio.h>
  20
  21 struct serio {
  22         void *port_data;
  23
  24         char name[32];
  25         char phys[32];
  26         char firmware_id[128];
  27
  28         bool manual_bind;
  29
  30         struct serio_device_id id;
  31
  32         spinlock_t lock;                /* protects critical sections from port's interrupt handler */
  33
  34         int (*write)(struct serio *, unsigned char);
  35         int (*open)(struct serio *);
  36         void (*close)(struct serio *);
  37         int (*start)(struct serio *);
  38         void (*stop)(struct serio *);
  39
  40         struct serio *parent;
  41         struct list_head child_node;    /* Entry in parent->children list */
  42         struct list_head children;
  43         unsigned int depth;             /* level of nesting in serio hierarchy */
  44
  45         struct serio_driver *drv;       /* accessed from interrupt, must be protected by serio->lock and serio->sem */
  46         struct mutex drv_mutex;         /* protects serio->drv so attributes can pin driver */
  47
  48         struct device dev;
  49
  50         struct list_head node;
  51 };
  52 #define to_serio_port(d)        container_of(d, struct serio, dev)
  53
  54 struct serio_driver {
  55         const char *description;
  56
  57         const struct serio_device_id *id_table;
  58         bool manual_bind;
  59
  60         void (*write_wakeup)(struct serio *);
  61         irqreturn_t (*interrupt)(struct serio *, unsigned char, unsigned int);
  62         int  (*connect)(struct serio *, struct serio_driver *drv);
  63         int  (*reconnect)(struct serio *);
  64         void (*disconnect)(struct serio *);
  65         void (*cleanup)(struct serio *);
  66
  67         struct device_driver driver;
  68 };
  69 #define to_serio_driver(d)      container_of(d, struct serio_driver, driver)
  70
  71 int serio_open(struct serio *serio, struct serio_driver *drv);
  72 void serio_close(struct serio *serio);
  73 void serio_rescan(struct serio *serio);
  74 void serio_reconnect(struct serio *serio);
  75 irqreturn_t serio_interrupt(struct serio *serio, unsigned char data, unsigned int flags);
  76
  77 void __serio_register_port(struct serio *serio, struct module *owner);
  78
  79 /* use a define to avoid include chaining to get THIS_MODULE */
  80 #define serio_register_port(serio) \
  81         __serio_register_port(serio, THIS_MODULE)
  82
  83 void serio_unregister_port(struct serio *serio);
  84 void serio_unregister_child_port(struct serio *serio);
  85
  86 int __must_check __serio_register_driver(struct serio_driver *drv,
  87                                 struct module *owner, const char *mod_name);
  88
  89 /* use a define to avoid include chaining to get THIS_MODULE & friends */
  90 #define serio_register_driver(drv) \
  91         __serio_register_driver(drv, THIS_MODULE, KBUILD_MODNAME)
  92
  93 void serio_unregister_driver(struct serio_driver *drv);
  94
  95 /**
  96  * module_serio_driver() - Helper macro for registering a serio driver
  97  * @__serio_driver: serio_driver struct
  98  *
  99  * Helper macro for serio drivers which do not do anything special in
 100  * module init/exit. This eliminates a lot of boilerplate. Each module
 101  * may only use this macro once, and calling it replaces module_init()
 102  * and module_exit().
 103  */
 104 #define module_serio_driver(__serio_driver) \
 105         module_driver(__serio_driver, serio_register_driver, \
 106                        serio_unregister_driver)
 107
 108 static inline int serio_write(struct serio *serio, unsigned char data)
 109 {
 110         if (serio->write)
 111                 return serio->write(serio, data);
 112         else
 113                 return -1;
 114 }
 115
 116 static inline void serio_drv_write_wakeup(struct serio *serio)
 117 {
 118         if (serio->drv && serio->drv->write_wakeup)
 119                 serio->drv->write_wakeup(serio);
 120 }
 121
 122 /*
 123  * Use the following functions to manipulate serio's per-port
 124  * driver-specific data.
 125  */
 126 static inline void *serio_get_drvdata(struct serio *serio)
 127 {
 128         return dev_get_drvdata(&serio->dev);
 129 }
 130
 131 static inline void serio_set_drvdata(struct serio *serio, void *data)
 132 {
 133         dev_set_drvdata(&serio->dev, data);
 134 }
 135
 136 /*
 137  * Use the following functions to protect critical sections in
 138  * driver code from port's interrupt handler
 139  */
 140 static inline void serio_pause_rx(struct serio *serio)
 141 {
 142         spin_lock_irq(&serio->lock);
 143 }
 144
 145 static inline void serio_continue_rx(struct serio *serio)
 146 {
 147         spin_unlock_irq(&serio->lock);
 148 }
 149
 150 #endif