include/linux/uio_driver.h

   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  * @dma_addr:           DMA handle set by dma_alloc_coherent, used with
  32  *                      UIO_MEM_DMA_COHERENT only (@addr should be the
  33  *                      void * returned from the same dma_alloc_coherent call)
  34  * @offs:               offset of device memory within the page
  35  * @size:               size of IO (multiple of page size)
  36  * @memtype:            type of memory addr points to
  37  * @internal_addr:      ioremap-ped version of addr, for driver internal use
  38  * @dma_device:         device struct that was passed to dma_alloc_coherent,
  39  *                      used with UIO_MEM_DMA_COHERENT only
  40  * @map:                for use by the UIO core only.
  41  */
  42 struct uio_mem {
  43         const char              *name;
  44         phys_addr_t             addr;
  45         dma_addr_t              dma_addr;
  46         unsigned long           offs;
  47         resource_size_t         size;
  48         int                     memtype;
  49         void __iomem            *internal_addr;
  50         struct device           *dma_device;
  51         struct uio_map          *map;
  52 };
  53
  54 #define MAX_UIO_MAPS    5
  55
  56 struct uio_portio;
  57
  58 /**
  59  * struct uio_port - description of a UIO port region
  60  * @name:               name of the port region for identification
  61  * @start:              start of port region
  62  * @size:               size of port region
  63  * @porttype:           type of port (see UIO_PORT_* below)
  64  * @portio:             for use by the UIO core only.
  65  */
  66 struct uio_port {
  67         const char              *name;
  68         unsigned long           start;
  69         unsigned long           size;
  70         int                     porttype;
  71         struct uio_portio       *portio;
  72 };
  73
  74 #define MAX_UIO_PORT_REGIONS    5
  75
  76 struct uio_device {
  77         struct module           *owner;
  78         struct device           dev;
  79         int                     minor;
  80         atomic_t                event;
  81         struct fasync_struct    *async_queue;
  82         wait_queue_head_t       wait;
  83         struct uio_info         *info;
  84         struct mutex            info_lock;
  85         struct kobject          *map_dir;
  86         struct kobject          *portio_dir;
  87 };
  88
  89 /**
  90  * struct uio_info - UIO device capabilities
  91  * @uio_dev:            the UIO device this info belongs to
  92  * @name:               device name
  93  * @version:            device driver version
  94  * @mem:                list of mappable memory regions, size==0 for end of list
  95  * @port:               list of port regions, size==0 for end of list
  96  * @irq:                interrupt number or UIO_IRQ_CUSTOM
  97  * @irq_flags:          flags for request_irq()
  98  * @priv:               optional private data
  99  * @handler:            the device's irq handler
 100  * @mmap:               mmap operation for this uio device
 101  * @open:               open operation for this uio device
 102  * @release:            release operation for this uio device
 103  * @irqcontrol:         disable/enable irqs when 0/1 is written to /dev/uioX
 104  */
 105 struct uio_info {
 106         struct uio_device       *uio_dev;
 107         const char              *name;
 108         const char              *version;
 109         struct uio_mem          mem[MAX_UIO_MAPS];
 110         struct uio_port         port[MAX_UIO_PORT_REGIONS];
 111         long                    irq;
 112         unsigned long           irq_flags;
 113         void                    *priv;
 114         irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
 115         int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
 116         int (*open)(struct uio_info *info, struct inode *inode);
 117         int (*release)(struct uio_info *info, struct inode *inode);
 118         int (*irqcontrol)(struct uio_info *info, s32 irq_on);
 119 };
 120
 121 extern int __must_check
 122         __uio_register_device(struct module *owner,
 123                               struct device *parent,
 124                               struct uio_info *info);
 125
 126 /* use a define to avoid include chaining to get THIS_MODULE */
 127
 128 /**
 129  * uio_register_device - register a new userspace IO device
 130  * @parent:     parent device
 131  * @info:       UIO device capabilities
 132  *
 133  * returns zero on success or a negative error code.
 134  */
 135 #define uio_register_device(parent, info) \
 136         __uio_register_device(THIS_MODULE, parent, info)
 137
 138 extern void uio_unregister_device(struct uio_info *info);
 139 extern void uio_event_notify(struct uio_info *info);
 140
 141 extern int __must_check
 142         __devm_uio_register_device(struct module *owner,
 143                                    struct device *parent,
 144                                    struct uio_info *info);
 145
 146 /* use a define to avoid include chaining to get THIS_MODULE */
 147
 148 /**
 149  * devm_uio_register_device - Resource managed uio_register_device()
 150  * @parent:     parent device
 151  * @info:       UIO device capabilities
 152  *
 153  * returns zero on success or a negative error code.
 154  */
 155 #define devm_uio_register_device(parent, info) \
 156         __devm_uio_register_device(THIS_MODULE, parent, info)
 157
 158 /* defines for uio_info->irq */
 159 #define UIO_IRQ_CUSTOM  -1
 160 #define UIO_IRQ_NONE    0
 161
 162 /* defines for uio_mem->memtype */
 163 #define UIO_MEM_NONE    0
 164 #define UIO_MEM_PHYS    1
 165 #define UIO_MEM_LOGICAL 2
 166 #define UIO_MEM_VIRTUAL 3
 167 #define UIO_MEM_IOVA    4
 168 /*
 169  * UIO_MEM_DMA_COHERENT exists for legacy drivers that had been getting by with
 170  * improperly mapping DMA coherent allocations through the other modes.
 171  * Do not use in new drivers.
 172  */
 173 #define UIO_MEM_DMA_COHERENT    5
 174
 175 /* defines for uio_port->porttype */
 176 #define UIO_PORT_NONE   0
 177 #define UIO_PORT_X86    1
 178 #define UIO_PORT_GPIO   2
 179 #define UIO_PORT_OTHER  3
 180
 181 #endif /* _LINUX_UIO_DRIVER_H_ */