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Linux/include/linux/uio_driver.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * include/linux/uio_driver.h
  4  *
  5  * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de>
  6  * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
  7  * Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de>
  8  * Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com>
  9  *
 10  * Userspace IO driver.
 11  */
 12 
 13 #ifndef _UIO_DRIVER_H_
 14 #define _UIO_DRIVER_H_
 15 
 16 #include <linux/device.h>
 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 mutex            info_lock;
 78         struct kobject          *map_dir;
 79         struct kobject          *portio_dir;
 80 };
 81 
 82 /**
 83  * struct uio_info - UIO device capabilities
 84  * @uio_dev:            the UIO device this info belongs to
 85  * @name:               device name
 86  * @version:            device driver version
 87  * @mem:                list of mappable memory regions, size==0 for end of list
 88  * @port:               list of port regions, size==0 for end of list
 89  * @irq:                interrupt number or UIO_IRQ_CUSTOM
 90  * @irq_flags:          flags for request_irq()
 91  * @priv:               optional private data
 92  * @handler:            the device's irq handler
 93  * @mmap:               mmap operation for this uio device
 94  * @open:               open operation for this uio device
 95  * @release:            release operation for this uio device
 96  * @irqcontrol:         disable/enable irqs when 0/1 is written to /dev/uioX
 97  */
 98 struct uio_info {
 99         struct uio_device       *uio_dev;
100         const char              *name;
101         const char              *version;
102         struct uio_mem          mem[MAX_UIO_MAPS];
103         struct uio_port         port[MAX_UIO_PORT_REGIONS];
104         long                    irq;
105         unsigned long           irq_flags;
106         void                    *priv;
107         irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
108         int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
109         int (*open)(struct uio_info *info, struct inode *inode);
110         int (*release)(struct uio_info *info, struct inode *inode);
111         int (*irqcontrol)(struct uio_info *info, s32 irq_on);
112 };
113 
114 extern int __must_check
115         __uio_register_device(struct module *owner,
116                               struct device *parent,
117                               struct uio_info *info);
118 
119 /* use a define to avoid include chaining to get THIS_MODULE */
120 #define uio_register_device(parent, info) \
121         __uio_register_device(THIS_MODULE, parent, info)
122 
123 extern void uio_unregister_device(struct uio_info *info);
124 extern void uio_event_notify(struct uio_info *info);
125 
126 extern int __must_check
127         __devm_uio_register_device(struct module *owner,
128                                    struct device *parent,
129                                    struct uio_info *info);
130 
131 /* use a define to avoid include chaining to get THIS_MODULE */
132 #define devm_uio_register_device(parent, info) \
133         __devm_uio_register_device(THIS_MODULE, parent, info)
134 
135 /* defines for uio_info->irq */
136 #define UIO_IRQ_CUSTOM  -1
137 #define UIO_IRQ_NONE    0
138 
139 /* defines for uio_mem->memtype */
140 #define UIO_MEM_NONE    0
141 #define UIO_MEM_PHYS    1
142 #define UIO_MEM_LOGICAL 2
143 #define UIO_MEM_VIRTUAL 3
144 #define UIO_MEM_IOVA    4
145 
146 /* defines for uio_port->porttype */
147 #define UIO_PORT_NONE   0
148 #define UIO_PORT_X86    1
149 #define UIO_PORT_GPIO   2
150 #define UIO_PORT_OTHER  3
151 
152 #endif /* _LINUX_UIO_DRIVER_H_ */
153 

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