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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/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_ */
139 

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