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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182/* SPDX-License-Identifier: GPL-2.0-only *//* * include/linux/uio_driver.h * * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de> * Copyright(C) 2005, Linutronix GmbH, Thomas Gleixner <tglx@kernel.org> * Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de> * Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com> * * Userspace IO driver. */
#ifndef _UIO_DRIVER_H_#define _UIO_DRIVER_H_
#include <linux/device.h>#include <linux/fs.h>#include <linux/interrupt.h>
struct module;struct uio_map;
/** * struct uio_mem - description of a UIO memory region * @name: name of the memory region for identification * @addr: address of the device's memory rounded to page * size (phys_addr is used since addr can be * logical, virtual, or physical & phys_addr_t * should always be large enough to handle any of * the address types) * @dma_addr: DMA handle set by dma_alloc_coherent, used with * UIO_MEM_DMA_COHERENT only (@addr should be the * void * returned from the same dma_alloc_coherent call) * @offs: offset of device memory within the page * @size: size of IO (multiple of page size) * @memtype: type of memory addr points to * @internal_addr: ioremap-ped version of addr, for driver internal use * @dma_device: device struct that was passed to dma_alloc_coherent, * used with UIO_MEM_DMA_COHERENT only * @map: for use by the UIO core only. */struct uio_mem { const char *name; phys_addr_t addr; dma_addr_t dma_addr; unsigned long offs; resource_size_t size; int memtype; void __iomem *internal_addr; struct device *dma_device; struct uio_map *map;};
#define MAX_UIO_MAPS 5
struct uio_portio;
/** * struct uio_port - description of a UIO port region * @name: name of the port region for identification * @start: start of port region * @size: size of port region * @porttype: type of port (see UIO_PORT_* below) * @portio: for use by the UIO core only. */struct uio_port { const char *name; unsigned long start; unsigned long size; int porttype; struct uio_portio *portio;};
#define MAX_UIO_PORT_REGIONS 5
struct uio_device { struct module *owner; struct device dev; int minor; atomic_t event; struct fasync_struct *async_queue; wait_queue_head_t wait; struct uio_info *info; struct mutex info_lock; struct kobject *map_dir; struct kobject *portio_dir;};
/** * 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 * @port: list of port 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_prepare: mmap_prepare operation for this uio device * @open: open operation for this uio device * @release: release operation for this uio device * @irqcontrol: disable/enable irqs when 0/1 is written to /dev/uioX */struct uio_info { struct uio_device *uio_dev; const char *name; const char *version; struct uio_mem mem[MAX_UIO_MAPS]; struct uio_port port[MAX_UIO_PORT_REGIONS]; long irq; unsigned long irq_flags; void *priv; irqreturn_t (*handler)(int irq, struct uio_info *dev_info); int (*mmap_prepare)(struct uio_info *info, struct vm_area_desc *desc); int (*open)(struct uio_info *info, struct inode *inode); int (*release)(struct uio_info *info, struct inode *inode); int (*irqcontrol)(struct uio_info *info, s32 irq_on);};
extern int __must_check __uio_register_device(struct module *owner, struct device *parent, struct uio_info *info);
/* use a define to avoid include chaining to get THIS_MODULE */
/** * uio_register_device - register a new userspace IO device * @parent: parent device * @info: UIO device capabilities * * returns zero on success or a negative error code. */#define uio_register_device(parent, info) \ __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);
extern int __must_check __devm_uio_register_device(struct module *owner, struct device *parent, struct uio_info *info);
/* use a define to avoid include chaining to get THIS_MODULE */
/** * devm_uio_register_device - Resource managed uio_register_device() * @parent: parent device * @info: UIO device capabilities * * returns zero on success or a negative error code. */#define devm_uio_register_device(parent, info) \ __devm_uio_register_device(THIS_MODULE, parent, info)
/* defines for uio_info->irq */#define UIO_IRQ_CUSTOM -1#define UIO_IRQ_NONE 0
/* defines for uio_mem->memtype */#define UIO_MEM_NONE 0#define UIO_MEM_PHYS 1#define UIO_MEM_LOGICAL 2#define UIO_MEM_VIRTUAL 3#define UIO_MEM_IOVA 4/* * UIO_MEM_DMA_COHERENT exists for legacy drivers that had been getting by with * improperly mapping DMA coherent allocations through the other modes. * Do not use in new drivers. */#define UIO_MEM_DMA_COHERENT 5
/* defines for uio_port->porttype */#define UIO_PORT_NONE 0#define UIO_PORT_X86 1#define UIO_PORT_GPIO 2#define UIO_PORT_OTHER 3
#endif /* _LINUX_UIO_DRIVER_H_ */