include/linux/uio_driver.h

   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@linutronix.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/module.h>
  18 #include <linux/fs.h>
  19 #include <linux/interrupt.h>
  20
  21 struct uio_map;
  22
  23 /**
  24  * struct uio_mem - description of a UIO memory region
  25  * @addr:               address of the device's memory
  26  * @size:               size of IO
  27  * @memtype:            type of memory addr points to
  28  * @internal_addr:      ioremap-ped version of addr, for driver internal use
  29  * @map:                for use by the UIO core only.
  30  */
  31 struct uio_mem {
  32         unsigned long           addr;
  33         unsigned long           size;
  34         int                     memtype;
  35         void __iomem            *internal_addr;
  36         struct uio_map          *map;
  37 };
  38
  39 #define MAX_UIO_MAPS    5
  40
  41 struct uio_device;
  42
  43 /**
  44  * struct uio_info - UIO device capabilities
  45  * @uio_dev:            the UIO device this info belongs to
  46  * @name:               device name
  47  * @version:            device driver version
  48  * @mem:                list of mappable memory regions, size==0 for end of list
  49  * @irq:                interrupt number or UIO_IRQ_CUSTOM
  50  * @irq_flags:          flags for request_irq()
  51  * @priv:               optional private data
  52  * @handler:            the device's irq handler
  53  * @mmap:               mmap operation for this uio device
  54  * @open:               open operation for this uio device
  55  * @release:            release operation for this uio device
  56  * @irqcontrol:         disable/enable irqs when 0/1 is written to /dev/uioX
  57  */
  58 struct uio_info {
  59         struct uio_device       *uio_dev;
  60         char                    *name;
  61         char                    *version;
  62         struct uio_mem          mem[MAX_UIO_MAPS];
  63         long                    irq;
  64         unsigned long           irq_flags;
  65         void                    *priv;
  66         irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
  67         int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
  68         int (*open)(struct uio_info *info, struct inode *inode);
  69         int (*release)(struct uio_info *info, struct inode *inode);
  70         int (*irqcontrol)(struct uio_info *info, s32 irq_on);
  71 };
  72
  73 extern int __must_check
  74         __uio_register_device(struct module *owner,
  75                               struct device *parent,
  76                               struct uio_info *info);
  77 static inline int __must_check
  78         uio_register_device(struct device *parent, struct uio_info *info)
  79 {
  80         return __uio_register_device(THIS_MODULE, parent, info);
  81 }
  82 extern void uio_unregister_device(struct uio_info *info);
  83 extern void uio_event_notify(struct uio_info *info);
  84
  85 /* defines for uio_info->irq */
  86 #define UIO_IRQ_CUSTOM  -1
  87 #define UIO_IRQ_NONE    -2
  88
  89 /* defines for uio_mem->memtype */
  90 #define UIO_MEM_NONE    0
  91 #define UIO_MEM_PHYS    1
  92 #define UIO_MEM_LOGICAL 2
  93 #define UIO_MEM_VIRTUAL 3
  94
  95 #endif /* _LINUX_UIO_DRIVER_H_ */