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