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TOMOYO Linux Cross Reference
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 
 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_ */
142 

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