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