summaryrefslogtreecommitdiffstats
path: root/include/linux/uio_driver.h
blob: a3cd7cb67a69fec3d82e3583f6527d611110cd2f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*
 * include/linux/uio_driver.h
 *
 * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de>
 * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
 * Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de>
 * Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com>
 *
 * Userspace IO driver.
 *
 * Licensed under the GPLv2 only.
 */

#ifndef _UIO_DRIVER_H_
#define _UIO_DRIVER_H_

#include <linux/device.h>
#include <linux/fs.h>
#include <linux/interrupt.h>

struct module;
struct uio_map;

/**
 * struct uio_mem - description of a UIO memory region
 * @name:		name of the memory region for identification
 * @addr:               address of the device's memory rounded to page
 * 			size (phys_addr is used since addr can be
 * 			logical, virtual, or physical & phys_addr_t
 * 			should always be large enough to handle any of
 * 			the address types)
 * @offs:               offset of device memory within the page
 * @size:		size of IO (multiple of page size)
 * @memtype:		type of memory addr points to
 * @internal_addr:	ioremap-ped version of addr, for driver internal use
 * @map:		for use by the UIO core only.
 */
struct uio_mem {
	const char		*name;
	phys_addr_t		addr;
	unsigned long		offs;
	resource_size_t		size;
	int			memtype;
	void __iomem		*internal_addr;
	struct uio_map		*map;
};

#define MAX_UIO_MAPS	5

struct uio_portio;

/**
 * struct uio_port - description of a UIO port region
 * @name:		name of the port region for identification
 * @start:		start of port region
 * @size:		size of port region
 * @porttype:		type of port (see UIO_PORT_* below)
 * @portio:		for use by the UIO core only.
 */
struct uio_port {
	const char		*name;
	unsigned long		start;
	unsigned long		size;
	int			porttype;
	struct uio_portio	*portio;
};

#define MAX_UIO_PORT_REGIONS	5

struct uio_device {
        struct module           *owner;
	struct device		dev;
        int                     minor;
        atomic_t                event;
        struct fasync_struct    *async_queue;
        wait_queue_head_t       wait;
        struct uio_info         *info;
	struct mutex		info_lock;
        struct kobject          *map_dir;
        struct kobject          *portio_dir;
};

/**
 * struct uio_info - UIO device capabilities
 * @uio_dev:		the UIO device this info belongs to
 * @name:		device name
 * @version:		device driver version
 * @mem:		list of mappable memory regions, size==0 for end of list
 * @port:		list of port regions, size==0 for end of list
 * @irq:		interrupt number or UIO_IRQ_CUSTOM
 * @irq_flags:		flags for request_irq()
 * @priv:		optional private data
 * @handler:		the device's irq handler
 * @mmap:		mmap operation for this uio device
 * @open:		open operation for this uio device
 * @release:		release operation for this uio device
 * @irqcontrol:		disable/enable irqs when 0/1 is written to /dev/uioX
 */
struct uio_info {
	struct uio_device	*uio_dev;
	const char		*name;
	const char		*version;
	struct uio_mem		mem[MAX_UIO_MAPS];
	struct uio_port		port[MAX_UIO_PORT_REGIONS];
	long			irq;
	unsigned long		irq_flags;
	void			*priv;
	irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
	int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
	int (*open)(struct uio_info *info, struct inode *inode);
	int (*release)(struct uio_info *info, struct inode *inode);
	int (*irqcontrol)(struct uio_info *info, s32 irq_on);
};

extern int __must_check
	__uio_register_device(struct module *owner,
			      struct device *parent,
			      struct uio_info *info);

/* use a define to avoid include chaining to get THIS_MODULE */
#define uio_register_device(parent, info) \
	__uio_register_device(THIS_MODULE, parent, info)

extern void uio_unregister_device(struct uio_info *info);
extern void uio_event_notify(struct uio_info *info);

/* defines for uio_info->irq */
#define UIO_IRQ_CUSTOM	-1
#define UIO_IRQ_NONE	0

/* defines for uio_mem->memtype */
#define UIO_MEM_NONE	0
#define UIO_MEM_PHYS	1
#define UIO_MEM_LOGICAL	2
#define UIO_MEM_VIRTUAL 3
#define UIO_MEM_IOVA	4

/* defines for uio_port->porttype */
#define UIO_PORT_NONE	0
#define UIO_PORT_X86	1
#define UIO_PORT_GPIO	2
#define UIO_PORT_OTHER	3

#endif /* _LINUX_UIO_DRIVER_H_ */
OpenPOWER on IntegriCloud