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UIO: Add the User IO core code

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This interface allows the ability to write the majority of a driver in
userspace with only a very small shell of a driver in the kernel itself.
It uses a char device and sysfs to interact with a userspace process to
process interrupts and control memory accesses.

See the docbook documentation for more details on how to use this
interface.

From: Hans J. Koch <hjk@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Benedikt Spranger <b.spranger@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Hans J. Koch 2006-12-07 10:58:29 +01:00 • committed by Greg Kroah-Hartman
parent 5bae7ac9fe
commit beafc54c4e
6 changed files with 811 additions and 0 deletions
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91
include/linux/uio_driver.h Normal file
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/*
* include/linux/uio_driver.h
*
* Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de>
* Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
* Copyright(C) 2006, Hans J. Koch <hjk@linutronix.de>
* Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com>
*
* Userspace IO driver.
*
* Licensed under the GPLv2 only.
*/
#ifndef _UIO_DRIVER_H_
#define _UIO_DRIVER_H_
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
/**
* struct uio_mem - description of a UIO memory region
* @kobj: kobject for this mapping
* @addr: address of the device's memory
* @size: size of IO
* @memtype: type of memory addr points to
* @internal_addr: ioremap-ped version of addr, for driver internal use
*/
struct uio_mem {
struct kobject kobj;
unsigned long addr;
unsigned long size;
int memtype;
void __iomem *internal_addr;
};
#define MAX_UIO_MAPS 5
struct uio_device;
/**
* struct uio_info - UIO device capabilities
* @uio_dev: the UIO device this info belongs to
* @name: device name
* @version: device driver version
* @mem: list of mappable memory regions, size==0 for end of list
* @irq: interrupt number or UIO_IRQ_CUSTOM
* @irq_flags: flags for request_irq()
* @priv: optional private data
* @handler: the device's irq handler
* @mmap: mmap operation for this uio device
* @open: open operation for this uio device
* @release: release operation for this uio device
*/
struct uio_info {
struct uio_device *uio_dev;
char *name;
char *version;
struct uio_mem mem[MAX_UIO_MAPS];
long irq;
unsigned long irq_flags;
void *priv;
irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
int (*open)(struct uio_info *info, struct inode *inode);
int (*release)(struct uio_info *info, struct inode *inode);
};
extern int __must_check
__uio_register_device(struct module *owner,
struct device *parent,
struct uio_info *info);
static inline int __must_check
uio_register_device(struct device *parent, struct uio_info *info)
{
return __uio_register_device(THIS_MODULE, parent, info);
}
extern void uio_unregister_device(struct uio_info *info);
extern void uio_event_notify(struct uio_info *info);
/* defines for uio_device->irq */
#define UIO_IRQ_CUSTOM -1
#define UIO_IRQ_NONE -2
/* defines for uio_device->memtype */
#define UIO_MEM_NONE 0
#define UIO_MEM_PHYS 1
#define UIO_MEM_LOGICAL 2
#define UIO_MEM_VIRTUAL 3
#endif /* _LINUX_UIO_DRIVER_H_ */