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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/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 #define UIO_MEM_IOVA    4
137 
138 /* defines for uio_port->porttype */
139 #define UIO_PORT_NONE   0
140 #define UIO_PORT_X86    1
141 #define UIO_PORT_GPIO   2
142 #define UIO_PORT_OTHER  3
143 
144 #endif /* _LINUX_UIO_DRIVER_H_ */
145 

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