linux/include/linux/uio_driver.h
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   1/*
   2 * include/linux/uio_driver.h
   3 *
   4 * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de>
   5 * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
   6 * Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de>
   7 * Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com>
   8 *
   9 * Userspace IO driver.
  10 *
  11 * Licensed under the GPLv2 only.
  12 */
  13
  14#ifndef _UIO_DRIVER_H_
  15#define _UIO_DRIVER_H_
  16
  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 (phys_addr is used since
  27 *                      addr can be logical, virtual, or physical & phys_addr_t
  28 *                      should always be large enough to handle any of the
  29 *                      address types)
  30 * @size:               size of IO
  31 * @memtype:            type of memory addr points to
  32 * @internal_addr:      ioremap-ped version of addr, for driver internal use
  33 * @map:                for use by the UIO core only.
  34 */
  35struct uio_mem {
  36        const char              *name;
  37        phys_addr_t             addr;
  38        unsigned long           size;
  39        int                     memtype;
  40        void __iomem            *internal_addr;
  41        struct uio_map          *map;
  42};
  43
  44#define MAX_UIO_MAPS    5
  45
  46struct uio_portio;
  47
  48/**
  49 * struct uio_port - description of a UIO port region
  50 * @name:               name of the port region for identification
  51 * @start:              start of port region
  52 * @size:               size of port region
  53 * @porttype:           type of port (see UIO_PORT_* below)
  54 * @portio:             for use by the UIO core only.
  55 */
  56struct uio_port {
  57        const char              *name;
  58        unsigned long           start;
  59        unsigned long           size;
  60        int                     porttype;
  61        struct uio_portio       *portio;
  62};
  63
  64#define MAX_UIO_PORT_REGIONS    5
  65
  66struct uio_device;
  67
  68/**
  69 * struct uio_info - UIO device capabilities
  70 * @uio_dev:            the UIO device this info belongs to
  71 * @name:               device name
  72 * @version:            device driver version
  73 * @mem:                list of mappable memory regions, size==0 for end of list
  74 * @port:               list of port regions, size==0 for end of list
  75 * @irq:                interrupt number or UIO_IRQ_CUSTOM
  76 * @irq_flags:          flags for request_irq()
  77 * @priv:               optional private data
  78 * @handler:            the device's irq handler
  79 * @mmap:               mmap operation for this uio device
  80 * @open:               open operation for this uio device
  81 * @release:            release operation for this uio device
  82 * @irqcontrol:         disable/enable irqs when 0/1 is written to /dev/uioX
  83 */
  84struct uio_info {
  85        struct uio_device       *uio_dev;
  86        const char              *name;
  87        const char              *version;
  88        struct uio_mem          mem[MAX_UIO_MAPS];
  89        struct uio_port         port[MAX_UIO_PORT_REGIONS];
  90        long                    irq;
  91        unsigned long           irq_flags;
  92        void                    *priv;
  93        irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
  94        int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
  95        int (*open)(struct uio_info *info, struct inode *inode);
  96        int (*release)(struct uio_info *info, struct inode *inode);
  97        int (*irqcontrol)(struct uio_info *info, s32 irq_on);
  98};
  99
 100extern int __must_check
 101        __uio_register_device(struct module *owner,
 102                              struct device *parent,
 103                              struct uio_info *info);
 104
 105/* use a define to avoid include chaining to get THIS_MODULE */
 106#define uio_register_device(parent, info) \
 107        __uio_register_device(THIS_MODULE, parent, info)
 108
 109extern void uio_unregister_device(struct uio_info *info);
 110extern void uio_event_notify(struct uio_info *info);
 111
 112/* defines for uio_info->irq */
 113#define UIO_IRQ_CUSTOM  -1
 114#define UIO_IRQ_NONE    0
 115
 116/* defines for uio_mem->memtype */
 117#define UIO_MEM_NONE    0
 118#define UIO_MEM_PHYS    1
 119#define UIO_MEM_LOGICAL 2
 120#define UIO_MEM_VIRTUAL 3
 121
 122/* defines for uio_port->porttype */
 123#define UIO_PORT_NONE   0
 124#define UIO_PORT_X86    1
 125#define UIO_PORT_GPIO   2
 126#define UIO_PORT_OTHER  3
 127
 128#endif /* _LINUX_UIO_DRIVER_H_ */
 129
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