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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * include/linux/uio_driver.h
4 *
5 * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de>
6 * Copyright(C) 2005, Linutronix GmbH, Thomas Gleixner <tglx@kernel.org>
7 * Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de>
8 * Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com>
9 *
10 * Userspace IO driver.
11 */
12
13#ifndef _UIO_DRIVER_H_
14#define _UIO_DRIVER_H_
15
16#include <linux/device.h>
17#include <linux/fs.h>
18#include <linux/interrupt.h>
19
20struct module;
21struct uio_map;
22
23/**
24 * struct uio_mem - description of a UIO memory region
25 * @name: name of the memory region for identification
26 * @addr: address of the device's memory rounded to page
27 * size (phys_addr is used since addr can be
28 * logical, virtual, or physical & phys_addr_t
29 * should always be large enough to handle any of
30 * the address types)
31 * @dma_addr: DMA handle set by dma_alloc_coherent, used with
32 * UIO_MEM_DMA_COHERENT only (@addr should be the
33 * void * returned from the same dma_alloc_coherent call)
34 * @offs: offset of device memory within the page
35 * @size: size of IO (multiple of page size)
36 * @memtype: type of memory addr points to
37 * @internal_addr: ioremap-ped version of addr, for driver internal use
38 * @dma_device: device struct that was passed to dma_alloc_coherent,
39 * used with UIO_MEM_DMA_COHERENT only
40 * @map: for use by the UIO core only.
41 */
42struct uio_mem {
43 const char *name;
44 phys_addr_t addr;
45 dma_addr_t dma_addr;
46 unsigned long offs;
47 resource_size_t size;
48 int memtype;
49 void __iomem *internal_addr;
50 struct device *dma_device;
51 struct uio_map *map;
52};
53
54#define MAX_UIO_MAPS 5
55
56struct uio_portio;
57
58/**
59 * struct uio_port - description of a UIO port region
60 * @name: name of the port region for identification
61 * @start: start of port region
62 * @size: size of port region
63 * @porttype: type of port (see UIO_PORT_* below)
64 * @portio: for use by the UIO core only.
65 */
66struct uio_port {
67 const char *name;
68 unsigned long start;
69 unsigned long size;
70 int porttype;
71 struct uio_portio *portio;
72};
73
74#define MAX_UIO_PORT_REGIONS 5
75
76struct uio_device {
77 struct module *owner;
78 struct device dev;
79 int minor;
80 atomic_t event;
81 struct fasync_struct *async_queue;
82 wait_queue_head_t wait;
83 struct uio_info *info;
84 struct mutex info_lock;
85 struct kobject *map_dir;
86 struct kobject *portio_dir;
87};
88
89/**
90 * struct uio_info - UIO device capabilities
91 * @uio_dev: the UIO device this info belongs to
92 * @name: device name
93 * @version: device driver version
94 * @mem: list of mappable memory regions, size==0 for end of list
95 * @port: list of port regions, size==0 for end of list
96 * @irq: interrupt number or UIO_IRQ_CUSTOM
97 * @irq_flags: flags for request_irq()
98 * @priv: optional private data
99 * @handler: the device's irq handler
100 * @mmap: mmap operation for this uio device
101 * @open: open operation for this uio device
102 * @release: release operation for this uio device
103 * @irqcontrol: disable/enable irqs when 0/1 is written to /dev/uioX
104 */
105struct uio_info {
106 struct uio_device *uio_dev;
107 const char *name;
108 const char *version;
109 struct uio_mem mem[MAX_UIO_MAPS];
110 struct uio_port port[MAX_UIO_PORT_REGIONS];
111 long irq;
112 unsigned long irq_flags;
113 void *priv;
114 irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
115 int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
116 int (*open)(struct uio_info *info, struct inode *inode);
117 int (*release)(struct uio_info *info, struct inode *inode);
118 int (*irqcontrol)(struct uio_info *info, s32 irq_on);
119};
120
121extern int __must_check
122 __uio_register_device(struct module *owner,
123 struct device *parent,
124 struct uio_info *info);
125
126/* use a define to avoid include chaining to get THIS_MODULE */
127
128/**
129 * uio_register_device - register a new userspace IO device
130 * @parent: parent device
131 * @info: UIO device capabilities
132 *
133 * returns zero on success or a negative error code.
134 */
135#define uio_register_device(parent, info) \
136 __uio_register_device(THIS_MODULE, parent, info)
137
138extern void uio_unregister_device(struct uio_info *info);
139extern void uio_event_notify(struct uio_info *info);
140
141extern int __must_check
142 __devm_uio_register_device(struct module *owner,
143 struct device *parent,
144 struct uio_info *info);
145
146/* use a define to avoid include chaining to get THIS_MODULE */
147
148/**
149 * devm_uio_register_device - Resource managed uio_register_device()
150 * @parent: parent device
151 * @info: UIO device capabilities
152 *
153 * returns zero on success or a negative error code.
154 */
155#define devm_uio_register_device(parent, info) \
156 __devm_uio_register_device(THIS_MODULE, parent, info)
157
158/* defines for uio_info->irq */
159#define UIO_IRQ_CUSTOM -1
160#define UIO_IRQ_NONE 0
161
162/* defines for uio_mem->memtype */
163#define UIO_MEM_NONE 0
164#define UIO_MEM_PHYS 1
165#define UIO_MEM_LOGICAL 2
166#define UIO_MEM_VIRTUAL 3
167#define UIO_MEM_IOVA 4
168/*
169 * UIO_MEM_DMA_COHERENT exists for legacy drivers that had been getting by with
170 * improperly mapping DMA coherent allocations through the other modes.
171 * Do not use in new drivers.
172 */
173#define UIO_MEM_DMA_COHERENT 5
174
175/* defines for uio_port->porttype */
176#define UIO_PORT_NONE 0
177#define UIO_PORT_X86 1
178#define UIO_PORT_GPIO 2
179#define UIO_PORT_OTHER 3
180
181#endif /* _LINUX_UIO_DRIVER_H_ */
182

source code of linux/include/linux/uio_driver.h