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