parport.h

无线传感器网络操作系统源代码

/* $Id: parport.h,v 1.1 2002/01/18 17:52:16 jlhill Exp $ */

#ifndef _PARPORT_H_
#define _PARPORT_H_

/* Start off with user-visible constants */

/* Maximum of 8 ports per machine */
#define PARPORT_MAX  8 

/* Magic numbers */
#define PARPORT_IRQ_NONE  -1
#define PARPORT_DMA_NONE  -1
#define PARPORT_IRQ_AUTO  -2
#define PARPORT_DMA_AUTO  -2
#define PARPORT_DISABLE   -2
#define PARPORT_IRQ_PROBEONLY -3

#define PARPORT_CONTROL_STROBE    0x1
#define PARPORT_CONTROL_AUTOFD    0x2
#define PARPORT_CONTROL_INIT      0x4
#define PARPORT_CONTROL_SELECT    0x8
#define PARPORT_CONTROL_INTEN     0x10
#define PARPORT_CONTROL_DIRECTION 0x20

#define PARPORT_STATUS_ERROR      0x8
#define PARPORT_STATUS_SELECT     0x10
#define PARPORT_STATUS_PAPEROUT   0x20
#define PARPORT_STATUS_ACK        0x40
#define PARPORT_STATUS_BUSY       0x80

/* Type classes for Plug-and-Play probe.  */
typedef enum {
	PARPORT_CLASS_LEGACY = 0,       /* Non-IEEE1284 device */
	PARPORT_CLASS_PRINTER,
	PARPORT_CLASS_MODEM,
	PARPORT_CLASS_NET,
	PARPORT_CLASS_HDC,              /* Hard disk controller */
	PARPORT_CLASS_PCMCIA,
	PARPORT_CLASS_MEDIA,            /* Multimedia device */
	PARPORT_CLASS_FDC,              /* Floppy disk controller */
	PARPORT_CLASS_PORTS,
	PARPORT_CLASS_SCANNER,
	PARPORT_CLASS_DIGCAM,
	PARPORT_CLASS_OTHER,            /* Anything else */
	PARPORT_CLASS_UNSPEC            /* No CLS field in ID */
} parport_device_class;

/* The "modes" entry in parport is a bit field representing the following
 * modes.
 * Note that PARPORT_MODE_PCECPEPP is for the SMC EPP+ECP mode which is NOT
 * 100% compatible with EPP.
 */
#define PARPORT_MODE_PCSPP	        0x0001
#define PARPORT_MODE_PCPS2		0x0002
#define PARPORT_MODE_PCEPP		0x0004
#define PARPORT_MODE_PCECP		0x0008
#define PARPORT_MODE_PCECPEPP		0x0010
#define PARPORT_MODE_PCECR		0x0020  /* ECR Register Exists */
#define PARPORT_MODE_PCECPPS2		0x0040

/* The rest is for the kernel only */
#ifdef __KERNEL__

#include <asm/system.h>
#include <asm/ptrace.h>
#include <asm/spinlock.h>
#include <linux/proc_fs.h>
#include <linux/config.h>

#define PARPORT_NEED_GENERIC_OPS

/* Define this later. */
struct parport;

struct pc_parport_state {
	unsigned int ctr;
	unsigned int ecr;
};

struct parport_state {
	union {
		struct pc_parport_state pc;
		/* ARC has no state. */
		/* AX uses same state information as PC */
		void *misc; 
	} u;
};

struct parport_operations {
	void (*write_data)(struct parport *, unsigned char);
	unsigned char (*read_data)(struct parport *);
	void (*write_control)(struct parport *, unsigned char);
	unsigned char (*read_control)(struct parport *);
	unsigned char (*frob_control)(struct parport *, unsigned char mask, unsigned char val);
	void (*write_econtrol)(struct parport *, unsigned char);
	unsigned char (*read_econtrol)(struct parport *);
	unsigned char (*frob_econtrol)(struct parport *, unsigned char mask, unsigned char val);
	void (*write_status)(struct parport *, unsigned char);
	unsigned char (*read_status)(struct parport *);
	void (*write_fifo)(struct parport *, unsigned char);
	unsigned char (*read_fifo)(struct parport *);

	void (*change_mode)(struct parport *, int);

	void (*release_resources)(struct parport *);
	int (*claim_resources)(struct parport *);

	void (*epp_write_data)(struct parport *, unsigned char);
	unsigned char (*epp_read_data)(struct parport *);
	void (*epp_write_addr)(struct parport *, unsigned char);
	unsigned char (*epp_read_addr)(struct parport *);
	int (*epp_check_timeout)(struct parport *);
	size_t (*epp_write_block)(struct parport *, void *, size_t);
	size_t (*epp_read_block)(struct parport *, void *, size_t);

	int (*ecp_write_block)(struct parport *, void *, size_t, void (*fn)(struct parport *, void *, size_t), void *);
	int (*ecp_read_block)(struct parport *, void *, size_t, void (*fn)(struct parport *, void *, size_t), void *);

	void (*init_state)(struct parport_state *);
	void (*save_state)(struct parport *, struct parport_state *);
	void (*restore_state)(struct parport *, struct parport_state *);

	void (*enable_irq)(struct parport *);
	void (*disable_irq)(struct parport *);
	void (*interrupt)(int, void *, struct pt_regs *);

	void (*inc_use_count)(void);
	void (*dec_use_count)(void);
	void (*fill_inode)(struct inode *inode, int fill);
};

struct parport_device_info {
	parport_device_class class;
	const char *class_name;
	const char *mfr;
	const char *model;
	const char *cmdset;
	const char *description;
};

/* Each device can have two callback functions:
 *  1) a preemption function, called by the resource manager to request
 *     that the driver relinquish control of the port.  The driver should
 *     return zero if it agrees to release the port, and nonzero if it 
 *     refuses.  Do not call parport_release() - the kernel will do this
 *     implicitly.
 *
 *  2) a wake-up function, called by the resource manager to tell drivers
 *     that the port is available to be claimed.  If a driver wants to use
 *     the port, it should call parport_claim() here.
 */

/* A parallel port device */
struct pardevice {
	const char *name;
	struct parport *port;
	int (*preempt)(void *);
	void (*wakeup)(void *);
	void *private;
	void (*irq_func)(int, void *, struct pt_regs *);
	unsigned int flags;
	struct pardevice *next;
	struct pardevice *prev;
	struct parport_state *state;     /* saved status over preemption */
	struct wait_queue *wait_q;
	unsigned long int time;
	unsigned long int timeslice;
	unsigned int waiting;
	struct pardevice *waitprev;
	struct pardevice *waitnext;
};

/* Directory information for the /proc interface */
struct parport_dir {
	struct proc_dir_entry *entry;    /* Directory /proc/parport/X     */
	struct proc_dir_entry *irq;	/*		.../irq           */
	struct proc_dir_entry *devices;  /*		.../devices       */
	struct proc_dir_entry *hardware; /*		.../hardware      */
	struct proc_dir_entry *probe;	 /*		.../autoprobe	  */
	char name[4];
};

/* A parallel port */
struct parport {
	unsigned long base;	/* base address */
	unsigned int size;	/* IO extent */
	const char *name;
	int irq;		/* interrupt (or -1 for none) */
	int dma;
	unsigned int modes;

	struct pardevice *devices;
	struct pardevice *cad;	/* port owner */

	struct pardevice *waithead;
	struct pardevice *waittail;
	
	struct parport *next;