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328a14e70e
Sometimes it is necessary to enable/disable the interrupt of a UIO device from the userspace part of the driver. With this patch, the UIO kernel driver can implement an "irqcontrol()" function that does this. Userspace can write an s32 value to /dev/uioX (usually 0 or 1 to turn the irq off or on). The UIO core will then call the driver's irqcontrol function. Signed-off-by: Hans J. Koch <hjk@linutronix.de> Acked-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> Acked-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/*
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* include/linux/uio_driver.h
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*
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* Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de>
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* Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
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* Copyright(C) 2006, Hans J. Koch <hjk@linutronix.de>
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* Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com>
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*
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* Userspace IO driver.
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*
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* Licensed under the GPLv2 only.
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*/
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#ifndef _UIO_DRIVER_H_
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#define _UIO_DRIVER_H_
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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struct uio_map;
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/**
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* struct uio_mem - description of a UIO memory region
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* @addr: address of the device's memory
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* @size: size of IO
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* @memtype: type of memory addr points to
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* @internal_addr: ioremap-ped version of addr, for driver internal use
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* @map: for use by the UIO core only.
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*/
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struct uio_mem {
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unsigned long addr;
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unsigned long size;
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int memtype;
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void __iomem *internal_addr;
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struct uio_map *map;
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};
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#define MAX_UIO_MAPS 5
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struct uio_device;
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/**
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* struct uio_info - UIO device capabilities
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* @uio_dev: the UIO device this info belongs to
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* @name: device name
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* @version: device driver version
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* @mem: list of mappable memory regions, size==0 for end of list
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* @irq: interrupt number or UIO_IRQ_CUSTOM
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* @irq_flags: flags for request_irq()
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* @priv: optional private data
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* @handler: the device's irq handler
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* @mmap: mmap operation for this uio device
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* @open: open operation for this uio device
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* @release: release operation for this uio device
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* @irqcontrol: disable/enable irqs when 0/1 is written to /dev/uioX
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*/
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struct uio_info {
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struct uio_device *uio_dev;
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char *name;
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char *version;
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struct uio_mem mem[MAX_UIO_MAPS];
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long irq;
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unsigned long irq_flags;
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void *priv;
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irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
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int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
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int (*open)(struct uio_info *info, struct inode *inode);
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int (*release)(struct uio_info *info, struct inode *inode);
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int (*irqcontrol)(struct uio_info *info, s32 irq_on);
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};
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extern int __must_check
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__uio_register_device(struct module *owner,
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struct device *parent,
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struct uio_info *info);
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static inline int __must_check
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uio_register_device(struct device *parent, struct uio_info *info)
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{
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return __uio_register_device(THIS_MODULE, parent, info);
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}
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extern void uio_unregister_device(struct uio_info *info);
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extern void uio_event_notify(struct uio_info *info);
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/* defines for uio_device->irq */
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#define UIO_IRQ_CUSTOM -1
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#define UIO_IRQ_NONE -2
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/* defines for uio_device->memtype */
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#define UIO_MEM_NONE 0
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#define UIO_MEM_PHYS 1
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#define UIO_MEM_LOGICAL 2
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#define UIO_MEM_VIRTUAL 3
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#endif /* _LINUX_UIO_DRIVER_H_ */
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