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         void (*disconnect)(struct serio *);
  81         void (*cleanup)(struct serio *);
  82
  83         struct device_driver driver;
  84 };
  85 #define to_serio_driver(d)      container_of(d, struct serio_driver, driver)
  86
  87 int serio_open(struct serio *serio, struct serio_driver *drv);
  88 void serio_close(struct serio *serio);
  89 void serio_rescan(struct serio *serio);
  90 void serio_reconnect(struct serio *serio);
  91 irqreturn_t serio_interrupt(struct serio *serio, unsigned char data, unsigned int flags);
  92
  93 void __serio_register_port(struct serio *serio, struct module *owner);
  94
  95 /* use a define to avoid include chaining to get THIS_MODULE */
  96 #define serio_register_port(serio) \
  97         __serio_register_port(serio, THIS_MODULE)
  98
  99 void serio_unregister_port(struct serio *serio);
 100 void serio_unregister_child_port(struct serio *serio);
 101
 102 int __must_check __serio_register_driver(struct serio_driver *drv,
 103                                 struct module *owner, const char *mod_name);
 104
 105 /* use a define to avoid include chaining to get THIS_MODULE & friends */
 106 #define serio_register_driver(drv) \
 107         __serio_register_driver(drv, THIS_MODULE, KBUILD_MODNAME)
 108
 109 void serio_unregister_driver(struct serio_driver *drv);
 110
 111 /**
 112  * module_serio_driver() - Helper macro for registering a serio driver
 113  * @__serio_driver: serio_driver struct
 114  *
 115  * Helper macro for serio drivers which do not do anything special in
 116  * module init/exit. This eliminates a lot of boilerplate. Each module
 117  * may only use this macro once, and calling it replaces module_init()
 118  * and module_exit().
 119  */
 120 #define module_serio_driver(__serio_driver) \
 121         module_driver(__serio_driver, serio_register_driver, \
 122                        serio_unregister_driver)
 123
 124 static inline int serio_write(struct serio *serio, unsigned char data)
 125 {
 126         if (serio->write)
 127                 return serio->write(serio, data);
 128         else
 129                 return -1;
 130 }
 131
 132 static inline void serio_drv_write_wakeup(struct serio *serio)
 133 {
 134         if (serio->drv && serio->drv->write_wakeup)
 135                 serio->drv->write_wakeup(serio);
 136 }
 137
 138 /*
 139  * Use the following functions to manipulate serio's per-port
 140  * driver-specific data.
 141  */
 142 static inline void *serio_get_drvdata(struct serio *serio)
 143 {
 144         return dev_get_drvdata(&serio->dev);
 145 }
 146
 147 static inline void serio_set_drvdata(struct serio *serio, void *data)
 148 {
 149         dev_set_drvdata(&serio->dev, data);
 150 }
 151
 152 /*
 153  * Use the following functions to protect critical sections in
 154  * driver code from port's interrupt handler
 155  */
 156 static inline void serio_pause_rx(struct serio *serio)
 157 {
 158         spin_lock_irq(&serio->lock);
 159 }
 160
 161 static inline void serio_continue_rx(struct serio *serio)
 162 {
 163         spin_unlock_irq(&serio->lock);
 164 }
 165
 166 #endif