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@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
  20 struct module;
  21 struct 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  */
  35 struct uio_mem {
  36         const char              *name;
  37         phys_addr_t             addr;
  38         resource_size_t         size;
  39         int                     memtype;
  40         void __iomem            *internal_addr;
  41         struct uio_map          *map;
  42 };
  43
  44 #define MAX_UIO_MAPS    5
  45
  46 struct 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  */
  56 struct 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
  66 struct uio_device {
  67         struct module           *owner;
  68         struct device           *dev;
  69         int                     minor;
  70         atomic_t                event;
  71         struct fasync_struct    *async_queue;
  72         wait_queue_head_t       wait;
  73         struct uio_info         *info;
  74         struct kobject          *map_dir;
  75         struct kobject          *portio_dir;
  76 };
  77
  78 /**
  79  * struct uio_info - UIO device capabilities
  80  * @uio_dev:            the UIO device this info belongs to
  81  * @name:               device name
  82  * @version:            device driver version
  83  * @mem:                list of mappable memory regions, size==0 for end of list
  84  * @port:               list of port regions, size==0 for end of list
  85  * @irq:                interrupt number or UIO_IRQ_CUSTOM
  86  * @irq_flags:          flags for request_irq()
  87  * @priv:               optional private data
  88  * @handler:            the device's irq handler
  89  * @mmap:               mmap operation for this uio device
  90  * @open:               open operation for this uio device
  91  * @release:            release operation for this uio device
  92  * @irqcontrol:         disable/enable irqs when 0/1 is written to /dev/uioX
  93  */
  94 struct uio_info {
  95         struct uio_device       *uio_dev;
  96         const char              *name;
  97         const char              *version;
  98         struct uio_mem          mem[MAX_UIO_MAPS];
  99         struct uio_port         port[MAX_UIO_PORT_REGIONS];
 100         long                    irq;
 101         unsigned long           irq_flags;
 102         void                    *priv;
 103         irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
 104         int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
 105         int (*open)(struct uio_info *info, struct inode *inode);
 106         int (*release)(struct uio_info *info, struct inode *inode);
 107         int (*irqcontrol)(struct uio_info *info, s32 irq_on);
 108 };
 109
 110 extern int __must_check
 111         __uio_register_device(struct module *owner,
 112                               struct device *parent,
 113                               struct uio_info *info);
 114
 115 /* use a define to avoid include chaining to get THIS_MODULE */
 116 #define uio_register_device(parent, info) \
 117         __uio_register_device(THIS_MODULE, parent, info)
 118
 119 extern void uio_unregister_device(struct uio_info *info);
 120 extern void uio_event_notify(struct uio_info *info);
 121
 122 /* defines for uio_info->irq */
 123 #define UIO_IRQ_CUSTOM  -1
 124 #define UIO_IRQ_NONE    0
 125
 126 /* defines for uio_mem->memtype */
 127 #define UIO_MEM_NONE    0
 128 #define UIO_MEM_PHYS    1
 129 #define UIO_MEM_LOGICAL 2
 130 #define UIO_MEM_VIRTUAL 3
 131
 132 /* defines for uio_port->porttype */
 133 #define UIO_PORT_NONE   0
 134 #define UIO_PORT_X86    1
 135 #define UIO_PORT_GPIO   2
 136 #define UIO_PORT_OTHER  3
 137
 138 #endif /* _LINUX_UIO_DRIVER_H_ */