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/device.h>
  18 #include <linux/fs.h>
  19 #include <linux/interrupt.h>
  20
  21 struct module;
  22 struct uio_map;
  23
  24 /**
  25  * struct uio_mem - description of a UIO memory region
  26  * @name:               name of the memory region for identification
  27  * @addr:               address of the device's memory rounded to page
  28  *                      size (phys_addr is used since addr can be
  29  *                      logical, virtual, or physical & phys_addr_t
  30  *                      should always be large enough to handle any of
  31  *                      the address types)
  32  * @offs:               offset of device memory within the page
  33  * @size:               size of IO (multiple of page size)
  34  * @memtype:            type of memory addr points to
  35  * @internal_addr:      ioremap-ped version of addr, for driver internal use
  36  * @map:                for use by the UIO core only.
  37  */
  38 struct uio_mem {
  39         const char              *name;
  40         phys_addr_t             addr;
  41         unsigned long           offs;
  42         resource_size_t         size;
  43         int                     memtype;
  44         void __iomem            *internal_addr;
  45         struct uio_map          *map;
  46 };
  47
  48 #define MAX_UIO_MAPS    5
  49
  50 struct uio_portio;
  51
  52 /**
  53  * struct uio_port - description of a UIO port region
  54  * @name:               name of the port region for identification
  55  * @start:              start of port region
  56  * @size:               size of port region
  57  * @porttype:           type of port (see UIO_PORT_* below)
  58  * @portio:             for use by the UIO core only.
  59  */
  60 struct uio_port {
  61         const char              *name;
  62         unsigned long           start;
  63         unsigned long           size;
  64         int                     porttype;
  65         struct uio_portio       *portio;
  66 };
  67
  68 #define MAX_UIO_PORT_REGIONS    5
  69
  70 struct uio_device {
  71         struct module           *owner;
  72         struct device           dev;
  73         int                     minor;
  74         atomic_t                event;
  75         struct fasync_struct    *async_queue;
  76         wait_queue_head_t       wait;
  77         struct uio_info         *info;
  78         struct mutex            info_lock;
  79         struct kobject          *map_dir;
  80         struct kobject          *portio_dir;
  81 };
  82
  83 /**
  84  * struct uio_info - UIO device capabilities
  85  * @uio_dev:            the UIO device this info belongs to
  86  * @name:               device name
  87  * @version:            device driver version
  88  * @mem:                list of mappable memory regions, size==0 for end of list
  89  * @port:               list of port regions, size==0 for end of list
  90  * @irq:                interrupt number or UIO_IRQ_CUSTOM
  91  * @irq_flags:          flags for request_irq()
  92  * @priv:               optional private data
  93  * @handler:            the device's irq handler
  94  * @mmap:               mmap operation for this uio device
  95  * @open:               open operation for this uio device
  96  * @release:            release operation for this uio device
  97  * @irqcontrol:         disable/enable irqs when 0/1 is written to /dev/uioX
  98  */
  99 struct uio_info {
 100         struct uio_device       *uio_dev;
 101         const char              *name;
 102         const char              *version;
 103         struct uio_mem          mem[MAX_UIO_MAPS];
 104         struct uio_port         port[MAX_UIO_PORT_REGIONS];
 105         long                    irq;
 106         unsigned long           irq_flags;
 107         void                    *priv;
 108         irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
 109         int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
 110         int (*open)(struct uio_info *info, struct inode *inode);
 111         int (*release)(struct uio_info *info, struct inode *inode);
 112         int (*irqcontrol)(struct uio_info *info, s32 irq_on);
 113 };
 114
 115 extern int __must_check
 116         __uio_register_device(struct module *owner,
 117                               struct device *parent,
 118                               struct uio_info *info);
 119
 120 /* use a define to avoid include chaining to get THIS_MODULE */
 121 #define uio_register_device(parent, info) \
 122         __uio_register_device(THIS_MODULE, parent, info)
 123
 124 extern void uio_unregister_device(struct uio_info *info);
 125 extern void uio_event_notify(struct uio_info *info);
 126
 127 /* defines for uio_info->irq */
 128 #define UIO_IRQ_CUSTOM  -1
 129 #define UIO_IRQ_NONE    0
 130
 131 /* defines for uio_mem->memtype */
 132 #define UIO_MEM_NONE    0
 133 #define UIO_MEM_PHYS    1
 134 #define UIO_MEM_LOGICAL 2
 135 #define UIO_MEM_VIRTUAL 3
 136
 137 /* defines for uio_port->porttype */
 138 #define UIO_PORT_NONE   0
 139 #define UIO_PORT_X86    1
 140 #define UIO_PORT_GPIO   2
 141 #define UIO_PORT_OTHER  3
 142
 143 #endif /* _LINUX_UIO_DRIVER_H_ */