linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * IBM/3270 Driver - core functions.

 *

 * Author(s):

 *   Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)

 *   Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>

 *     Copyright IBM Corp. 2003, 2009

 */

​

#include <linux/module.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/list.h>

#include <linux/slab.h>

#include <linux/types.h>

#include <linux/wait.h>

​

#include <asm/ccwdev.h>

#include <asm/cio.h>

#include <asm/ebcdic.h>

#include <asm/diag.h>

​

#include "raw3270.h"

​

#include <linux/major.h>

#include <linux/kdev_t.h>

#include <linux/device.h>

#include <linux/mutex.h>

​

struct class *class3270;

​

/* The main 3270 data structure. */

struct raw3270 {

    struct list_head list;

    struct ccw_device *cdev;

    int minor;

​

    short model, rows, cols;

    unsigned int state;

    unsigned long flags;

​

    struct list_head req_queue; /* Request queue. */

    struct list_head view_list; /* List of available views. */

    struct raw3270_view *view;  /* Active view. */

​

    struct timer_list timer;    /* Device timer. */

​

    unsigned char *ascebc;      /* ascii -> ebcdic table */

​

    struct raw3270_view init_view;

    struct raw3270_request init_reset;

    struct raw3270_request init_readpart;

    struct raw3270_request init_readmod;

    unsigned char init_data[256];

};

​

/* raw3270->state */

#define RAW3270_STATE_INIT  0   /* Initial state */

#define RAW3270_STATE_RESET 1   /* Reset command is pending */

#define RAW3270_STATE_W4ATTN    2   /* Wait for attention interrupt */

#define RAW3270_STATE_READMOD   3   /* Read partition is pending */

#define RAW3270_STATE_READY 4   /* Device is usable by views */

​

/* raw3270->flags */

#define RAW3270_FLAGS_14BITADDR 0   /* 14-bit buffer addresses */

#define RAW3270_FLAGS_BUSY  1   /* Device busy, leave it alone */

#define RAW3270_FLAGS_CONSOLE   2   /* Device is the console. */

#define RAW3270_FLAGS_FROZEN    3   /* set if 3270 is frozen for suspend */

​

/* Semaphore to protect global data of raw3270 (devices, views, etc). */

static DEFINE_MUTEX(raw3270_mutex);

​

/* List of 3270 devices. */

static LIST_HEAD(raw3270_devices);

​

/*

 * Flag to indicate if the driver has been registered. Some operations

 * like waiting for the end of i/o need to be done differently as long

 * as the kernel is still starting up (console support).

 */

static int raw3270_registered;

​

/* Module parameters */

static bool tubxcorrect;

module_param(tubxcorrect, bool, 0);

​

/*

 * Wait queue for device init/delete, view delete.

 */

DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);