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 extern struct bus_type serio_bus;
  22
  23 struct serio {
  24         void *port_data;
  25
  26         char name[32];
  27         char phys[32];
  28         char firmware_id[128];
  29
  30         bool manual_bind;
  31
  32         struct serio_device_id id;
  33
  34         /* Protects critical sections from port's interrupt handler */
  35         spinlock_t lock;
  36
  37         int (*write)(struct serio *, unsigned char);
  38         int (*open)(struct serio *);
  39         void (*close)(struct serio *);
  40         int (*start)(struct serio *);
  41         void (*stop)(struct serio *);
  42
  43         struct serio *parent;
  44         /* Entry in parent->children list */
  45         struct list_head child_node;
  46         struct list_head children;
  47         /* Level of nesting in serio hierarchy */
  48         unsigned int depth;
  49
  50         /*
  51          * serio->drv is accessed from interrupt handlers; when modifying
  52          * caller should acquire serio->drv_mutex and serio->lock.
  53          */
  54         struct serio_driver *drv;
  55         /* Protects serio->drv so attributes can pin current driver */
  56         struct mutex drv_mutex;
  57
  58         struct device dev;
  59
  60         struct list_head node;
  61
  62         /*
  63          * For use by PS/2 layer when several ports share hardware and
  64          * may get indigestion when exposed to concurrent access (i8042).
  65          */
  66         struct mutex *ps2_cmd_mutex;
  67 };
  68 #define to_serio_port(d)        container_of(d, struct serio, dev)
  69
  70 struct serio_driver {
  71         const char *description;
  72
  73         const struct serio_device_id *id_table;
  74         bool manual_bind;
  75
  76         void (*write_wakeup)(struct serio *);
  77         irqreturn_t (*interrupt)(struct serio *, unsigned char, unsigned int);
  78         int  (*connect)(struct serio *, struct serio_driver *drv);
  79         int  (*reconnect)(struct serio *);
  80         int  (*fast_reconnect)(struct serio *);
  81         void (*disconnect)(struct serio *);
  82         void (*cleanup)(struct serio *);
  83
  84         struct device_driver driver;
  85 };
  86 #define to_serio_driver(d)      container_of(d, struct serio_driver, driver)
  87
  88 int serio_open(struct serio *serio, struct serio_driver *drv);
  89 void serio_close(struct serio *serio);
  90 void serio_rescan(struct serio *serio);
  91 void serio_reconnect(struct serio *serio);
  92 irqreturn_t serio_interrupt(struct serio *serio, unsigned char data, unsigned int flags);
  93
  94 void __serio_register_port(struct serio *serio, struct module *owner);
  95
  96 /* use a define to avoid include chaining to get THIS_MODULE */
  97 #define serio_register_port(serio) \
  98         __serio_register_port(serio, THIS_MODULE)
  99
 100 void serio_unregister_port(struct serio *serio);
 101 void serio_unregister_child_port(struct serio *serio);
 102
 103 int __must_check __serio_register_driver(struct serio_driver *drv,
 104                                 struct module *owner, const char *mod_name);
 105
 106 /* use a define to avoid include chaining to get THIS_MODULE & friends */
 107 #define serio_register_driver(drv) \
 108         __serio_register_driver(drv, THIS_MODULE, KBUILD_MODNAME)
 109
 110 void serio_unregister_driver(struct serio_driver *drv);
 111
 112 /**
 113  * module_serio_driver() - Helper macro for registering a serio driver
 114  * @__serio_driver: serio_driver struct
 115  *
 116  * Helper macro for serio drivers which do not do anything special in
 117  * module init/exit. This eliminates a lot of boilerplate. Each module
 118  * may only use this macro once, and calling it replaces module_init()
 119  * and module_exit().
 120  */
 121 #define module_serio_driver(__serio_driver) \
 122         module_driver(__serio_driver, serio_register_driver, \
 123                        serio_unregister_driver)
 124
 125 static inline int serio_write(struct serio *serio, unsigned char data)
 126 {
 127         if (serio->write)
 128                 return serio->write(serio, data);
 129         else
 130                 return -1;
 131 }
 132
 133 static inline void serio_drv_write_wakeup(struct serio *serio)
 134 {
 135         if (serio->drv && serio->drv->write_wakeup)
 136                 serio->drv->write_wakeup(serio);
 137 }
 138
 139 /*
 140  * Use the following functions to manipulate serio's per-port
 141  * driver-specific data.
 142  */
 143 static inline void *serio_get_drvdata(struct serio *serio)
 144 {
 145         return dev_get_drvdata(&serio->dev);
 146 }
 147
 148 static inline void serio_set_drvdata(struct serio *serio, void *data)
 149 {
 150         dev_set_drvdata(&serio->dev, data);
 151 }
 152
 153 /*
 154  * Use the following functions to protect critical sections in
 155  * driver code from port's interrupt handler
 156  */
 157 static inline void serio_pause_rx(struct serio *serio)
 158 {
 159         spin_lock_irq(&serio->lock);
 160 }
 161
 162 static inline void serio_continue_rx(struct serio *serio)
 163 {
 164         spin_unlock_irq(&serio->lock);
 165 }
 166
 167 #endif