// SPDX-License-Identifier: GPL-2.0
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/*
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* IBM/3270 Driver - core functions.
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*
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* Author(s):
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* Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
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* Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Copyright IBM Corp. 2003, 2009
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include <asm/ebcdic.h>
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#include <asm/diag.h>
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#include "raw3270.h"
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#include <linux/major.h>
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#include <linux/kdev_t.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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struct class *class3270;
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/* The main 3270 data structure. */
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struct raw3270 {
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struct list_head list;
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struct ccw_device *cdev;
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int minor;
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short model, rows, cols;
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unsigned int state;
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unsigned long flags;
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struct list_head req_queue; /* Request queue. */
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struct list_head view_list; /* List of available views. */
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struct raw3270_view *view; /* Active view. */
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struct timer_list timer; /* Device timer. */
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unsigned char *ascebc; /* ascii -> ebcdic table */
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struct raw3270_view init_view;
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struct raw3270_request init_reset;
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struct raw3270_request init_readpart;
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struct raw3270_request init_readmod;
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unsigned char init_data[256];
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};
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/* raw3270->state */
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#define RAW3270_STATE_INIT 0 /* Initial state */
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#define RAW3270_STATE_RESET 1 /* Reset command is pending */
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#define RAW3270_STATE_W4ATTN 2 /* Wait for attention interrupt */
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#define RAW3270_STATE_READMOD 3 /* Read partition is pending */
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#define RAW3270_STATE_READY 4 /* Device is usable by views */
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/* raw3270->flags */
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#define RAW3270_FLAGS_14BITADDR 0 /* 14-bit buffer addresses */
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#define RAW3270_FLAGS_BUSY 1 /* Device busy, leave it alone */
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#define RAW3270_FLAGS_CONSOLE 2 /* Device is the console. */
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#define RAW3270_FLAGS_FROZEN 3 /* set if 3270 is frozen for suspend */
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/* Semaphore to protect global data of raw3270 (devices, views, etc). */
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static DEFINE_MUTEX(raw3270_mutex);
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/* List of 3270 devices. */
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static LIST_HEAD(raw3270_devices);
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/*
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* Flag to indicate if the driver has been registered. Some operations
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* like waiting for the end of i/o need to be done differently as long
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* as the kernel is still starting up (console support).
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*/
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static int raw3270_registered;
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/* Module parameters */
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static bool tubxcorrect;
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module_param(tubxcorrect, bool, 0);
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/*
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* Wait queue for device init/delete, view delete.
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*/
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DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);
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static void __raw3270_disconnect(struct raw3270 *rp);
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/*
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* Encode array for 12 bit 3270 addresses.
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*/
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static unsigned char raw3270_ebcgraf[64] = {
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0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
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0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
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0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
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0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
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0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
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0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
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0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
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0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f
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};
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static inline int raw3270_state_ready(struct raw3270 *rp)
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{
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return rp->state == RAW3270_STATE_READY;
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}
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static inline int raw3270_state_final(struct raw3270 *rp)
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{
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return rp->state == RAW3270_STATE_INIT ||
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rp->state == RAW3270_STATE_READY;
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}
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void
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raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr)
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{
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if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) {
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cp[0] = (addr >> 8) & 0x3f;
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cp[1] = addr & 0xff;
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} else {
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cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f];
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cp[1] = raw3270_ebcgraf[addr & 0x3f];
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}
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}
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/*
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* Allocate a new 3270 ccw request
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*/
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struct raw3270_request *
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raw3270_request_alloc(size_t size)
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{
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struct raw3270_request *rq;
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/* Allocate request structure */
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rq = kzalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA);
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if (!rq)
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return ERR_PTR(-ENOMEM);
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/* alloc output buffer. */
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if (size > 0) {
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rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA);
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if (!rq->buffer) {
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kfree(rq);
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return ERR_PTR(-ENOMEM);
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}
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}
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rq->size = size;
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INIT_LIST_HEAD(&rq->list);
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/*
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* Setup ccw.
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*/
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rq->ccw.cda = __pa(rq->buffer);
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rq->ccw.flags = CCW_FLAG_SLI;
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return rq;
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}
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/*
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* Free 3270 ccw request
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*/
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void
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raw3270_request_free (struct raw3270_request *rq)
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{
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kfree(rq->buffer);
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kfree(rq);
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}
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/*
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* Reset request to initial state.
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*/
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void
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raw3270_request_reset(struct raw3270_request *rq)
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{
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BUG_ON(!list_empty(&rq->list));
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rq->ccw.cmd_code = 0;
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rq->ccw.count = 0;
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rq->ccw.cda = __pa(rq->buffer);
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rq->ccw.flags = CCW_FLAG_SLI;
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rq->rescnt = 0;
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rq->rc = 0;
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}
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/*
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* Set command code to ccw of a request.
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*/
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void
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raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd)
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{
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rq->ccw.cmd_code = cmd;
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}
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/*
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* Add data fragment to output buffer.
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*/
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int
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raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size)
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{
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if (size + rq->ccw.count > rq->size)
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return -E2BIG;
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memcpy(rq->buffer + rq->ccw.count, data, size);
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rq->ccw.count += size;
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return 0;
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}
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/*
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* Set address/length pair to ccw of a request.
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*/
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void
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raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size)
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{
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rq->ccw.cda = __pa(data);
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rq->ccw.count = size;
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}
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/*
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* Set idal buffer to ccw of a request.
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*/
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void
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raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib)
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{
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rq->ccw.cda = __pa(ib->data);
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rq->ccw.count = ib->size;
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rq->ccw.flags |= CCW_FLAG_IDA;
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}
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/*
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* Add the request to the request queue, try to start it if the
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* 3270 device is idle. Return without waiting for end of i/o.
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*/
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static int
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__raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
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struct raw3270_request *rq)
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{
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rq->view = view;
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raw3270_get_view(view);
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if (list_empty(&rp->req_queue) &&
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!test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
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/* No other requests are on the queue. Start this one. */
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rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
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(unsigned long) rq, 0, 0);
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if (rq->rc) {
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raw3270_put_view(view);
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return rq->rc;
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}
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}
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list_add_tail(&rq->list, &rp->req_queue);
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return 0;
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}
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int
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raw3270_view_active(struct raw3270_view *view)
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{
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struct raw3270 *rp = view->dev;
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return rp && rp->view == view &&
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!test_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
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}
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int
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raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
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{
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unsigned long flags;
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struct raw3270 *rp;
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int rc;
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spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
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rp = view->dev;
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if (!rp || rp->view != view ||
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test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
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rc = -EACCES;
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else if (!raw3270_state_ready(rp))
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rc = -EBUSY;
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else
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rc = __raw3270_start(rp, view, rq);
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spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
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return rc;
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}
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int
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raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
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{
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struct raw3270 *rp;
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int rc;
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rp = view->dev;
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if (!rp || rp->view != view ||
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test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
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rc = -EACCES;
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else if (!raw3270_state_ready(rp))
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rc = -EBUSY;
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else
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rc = __raw3270_start(rp, view, rq);
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return rc;
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}
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int
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raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
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{
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struct raw3270 *rp;
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rp = view->dev;
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rq->view = view;
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raw3270_get_view(view);
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list_add_tail(&rq->list, &rp->req_queue);
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return 0;
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}
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/*
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* 3270 interrupt routine, called from the ccw_device layer
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*/
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static void
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raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
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{
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struct raw3270 *rp;
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struct raw3270_view *view;
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struct raw3270_request *rq;
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rp = dev_get_drvdata(&cdev->dev);
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if (!rp)
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return;
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rq = (struct raw3270_request *) intparm;
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view = rq ? rq->view : rp->view;
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if (!IS_ERR(irb)) {
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/* Handle CE-DE-UE and subsequent UDE */
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if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END)
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clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
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if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END |
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DEV_STAT_DEV_END |
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DEV_STAT_UNIT_EXCEP))
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set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
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/* Handle disconnected devices */
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if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
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(irb->ecw[0] & SNS0_INTERVENTION_REQ)) {
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set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
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if (rp->state > RAW3270_STATE_RESET)
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__raw3270_disconnect(rp);
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}
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/* Call interrupt handler of the view */
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if (view)
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view->fn->intv(view, rq, irb);
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}
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if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags))
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/* Device busy, do not start I/O */
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return;
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if (rq && !list_empty(&rq->list)) {
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/* The request completed, remove from queue and do callback. */
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list_del_init(&rq->list);
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if (rq->callback)
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rq->callback(rq, rq->callback_data);
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/* Do put_device for get_device in raw3270_start. */
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raw3270_put_view(view);
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}
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/*
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* Try to start each request on request queue until one is
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* started successful.
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*/
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while (!list_empty(&rp->req_queue)) {
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rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
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rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
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(unsigned long) rq, 0, 0);
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if (rq->rc == 0)
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break;
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/* Start failed. Remove request and do callback. */
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list_del_init(&rq->list);
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if (rq->callback)
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rq->callback(rq, rq->callback_data);
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/* Do put_device for get_device in raw3270_start. */
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raw3270_put_view(view);
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}
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}
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/*
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* To determine the size of the 3270 device we need to do:
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* 1) send a 'read partition' data stream to the device
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* 2) wait for the attn interrupt that precedes the query reply
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* 3) do a read modified to get the query reply
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* To make things worse we have to cope with intervention
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* required (3270 device switched to 'stand-by') and command
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* rejects (old devices that can't do 'read partition').
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*/
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struct raw3270_ua { /* Query Reply structure for Usable Area */
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struct { /* Usable Area Query Reply Base */
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short l; /* Length of this structured field */
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char sfid; /* 0x81 if Query Reply */
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char qcode; /* 0x81 if Usable Area */
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char flags0;
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char flags1;
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short w; /* Width of usable area */
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short h; /* Heigth of usavle area */
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char units; /* 0x00:in; 0x01:mm */
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int xr;
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int yr;
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char aw;
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char ah;
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short buffsz; /* Character buffer size, bytes */
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char xmin;
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char ymin;
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char xmax;
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char ymax;
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} __attribute__ ((packed)) uab;
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struct { /* Alternate Usable Area Self-Defining Parameter */
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char l; /* Length of this Self-Defining Parm */
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char sdpid; /* 0x02 if Alternate Usable Area */
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char res;
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char auaid; /* 0x01 is Id for the A U A */
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short wauai; /* Width of AUAi */
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short hauai; /* Height of AUAi */
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char auaunits; /* 0x00:in, 0x01:mm */
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int auaxr;
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int auayr;
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char awauai;
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char ahauai;
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} __attribute__ ((packed)) aua;
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} __attribute__ ((packed));
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static void
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raw3270_size_device_vm(struct raw3270 *rp)
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{
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int rc, model;
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struct ccw_dev_id dev_id;
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struct diag210 diag_data;
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ccw_device_get_id(rp->cdev, &dev_id);
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diag_data.vrdcdvno = dev_id.devno;
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diag_data.vrdclen = sizeof(struct diag210);
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rc = diag210(&diag_data);
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model = diag_data.vrdccrmd;
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/* Use default model 2 if the size could not be detected */
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if (rc || model < 2 || model > 5)
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model = 2;
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switch (model) {
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case 2:
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rp->model = model;
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rp->rows = 24;
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rp->cols = 80;
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break;
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case 3:
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rp->model = model;
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rp->rows = 32;
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rp->cols = 80;
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break;
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case 4:
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rp->model = model;
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rp->rows = 43;
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rp->cols = 80;
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break;
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case 5:
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rp->model = model;
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rp->rows = 27;
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rp->cols = 132;
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break;
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}
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}
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static void
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raw3270_size_device(struct raw3270 *rp)
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{
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struct raw3270_ua *uap;
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/* Got a Query Reply */
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uap = (struct raw3270_ua *) (rp->init_data + 1);
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/* Paranoia check. */
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if (rp->init_readmod.rc || rp->init_data[0] != 0x88 ||
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uap->uab.qcode != 0x81) {
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/* Couldn't detect size. Use default model 2. */
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rp->model = 2;
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rp->rows = 24;
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rp->cols = 80;
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return;
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}
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/* Copy rows/columns of default Usable Area */
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rp->rows = uap->uab.h;
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rp->cols = uap->uab.w;
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/* Check for 14 bit addressing */
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if ((uap->uab.flags0 & 0x0d) == 0x01)
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set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
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/* Check for Alternate Usable Area */
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if (uap->uab.l == sizeof(struct raw3270_ua) &&
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uap->aua.sdpid == 0x02) {
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rp->rows = uap->aua.hauai;
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rp->cols = uap->aua.wauai;
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}
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/* Try to find a model. */
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rp->model = 0;
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if (rp->rows == 24 && rp->cols == 80)
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rp->model = 2;
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if (rp->rows == 32 && rp->cols == 80)
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rp->model = 3;
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if (rp->rows == 43 && rp->cols == 80)
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rp->model = 4;
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if (rp->rows == 27 && rp->cols == 132)
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rp->model = 5;
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}
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static void
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raw3270_size_device_done(struct raw3270 *rp)
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{
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struct raw3270_view *view;
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rp->view = NULL;
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rp->state = RAW3270_STATE_READY;
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/* Notify views about new size */
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list_for_each_entry(view, &rp->view_list, list)
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if (view->fn->resize)
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view->fn->resize(view, rp->model, rp->rows, rp->cols);
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/* Setup processing done, now activate a view */
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list_for_each_entry(view, &rp->view_list, list) {
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rp->view = view;
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if (view->fn->activate(view) == 0)
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break;
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rp->view = NULL;
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}
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}
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static void
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raw3270_read_modified_cb(struct raw3270_request *rq, void *data)
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{
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struct raw3270 *rp = rq->view->dev;
|
|
raw3270_size_device(rp);
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raw3270_size_device_done(rp);
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}
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static void
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raw3270_read_modified(struct raw3270 *rp)
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{
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if (rp->state != RAW3270_STATE_W4ATTN)
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return;
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/* Use 'read modified' to get the result of a read partition. */
|
memset(&rp->init_readmod, 0, sizeof(rp->init_readmod));
|
memset(&rp->init_data, 0, sizeof(rp->init_data));
|
rp->init_readmod.ccw.cmd_code = TC_READMOD;
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rp->init_readmod.ccw.flags = CCW_FLAG_SLI;
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rp->init_readmod.ccw.count = sizeof(rp->init_data);
|
rp->init_readmod.ccw.cda = (__u32) __pa(rp->init_data);
|
rp->init_readmod.callback = raw3270_read_modified_cb;
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rp->state = RAW3270_STATE_READMOD;
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raw3270_start_irq(&rp->init_view, &rp->init_readmod);
|
}
|
|
static void
|
raw3270_writesf_readpart(struct raw3270 *rp)
|
{
|
static const unsigned char wbuf[] =
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{ 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 };
|
|
/* Store 'read partition' data stream to init_data */
|
memset(&rp->init_readpart, 0, sizeof(rp->init_readpart));
|
memset(&rp->init_data, 0, sizeof(rp->init_data));
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memcpy(&rp->init_data, wbuf, sizeof(wbuf));
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rp->init_readpart.ccw.cmd_code = TC_WRITESF;
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rp->init_readpart.ccw.flags = CCW_FLAG_SLI;
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rp->init_readpart.ccw.count = sizeof(wbuf);
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rp->init_readpart.ccw.cda = (__u32) __pa(&rp->init_data);
|
rp->state = RAW3270_STATE_W4ATTN;
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raw3270_start_irq(&rp->init_view, &rp->init_readpart);
|
}
|
|
/*
|
* Device reset
|
*/
|
static void
|
raw3270_reset_device_cb(struct raw3270_request *rq, void *data)
|
{
|
struct raw3270 *rp = rq->view->dev;
|
|
if (rp->state != RAW3270_STATE_RESET)
|
return;
|
if (rq->rc) {
|
/* Reset command failed. */
|
rp->state = RAW3270_STATE_INIT;
|
} else if (MACHINE_IS_VM) {
|
raw3270_size_device_vm(rp);
|
raw3270_size_device_done(rp);
|
} else
|
raw3270_writesf_readpart(rp);
|
memset(&rp->init_reset, 0, sizeof(rp->init_reset));
|
}
|
|
static int
|
__raw3270_reset_device(struct raw3270 *rp)
|
{
|
int rc;
|
|
/* Check if reset is already pending */
|
if (rp->init_reset.view)
|
return -EBUSY;
|
/* Store reset data stream to init_data/init_reset */
|
rp->init_data[0] = TW_KR;
|
rp->init_reset.ccw.cmd_code = TC_EWRITEA;
|
rp->init_reset.ccw.flags = CCW_FLAG_SLI;
|
rp->init_reset.ccw.count = 1;
|
rp->init_reset.ccw.cda = (__u32) __pa(rp->init_data);
|
rp->init_reset.callback = raw3270_reset_device_cb;
|
rc = __raw3270_start(rp, &rp->init_view, &rp->init_reset);
|
if (rc == 0 && rp->state == RAW3270_STATE_INIT)
|
rp->state = RAW3270_STATE_RESET;
|
return rc;
|
}
|
|
static int
|
raw3270_reset_device(struct raw3270 *rp)
|
{
|
unsigned long flags;
|
int rc;
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
rc = __raw3270_reset_device(rp);
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
return rc;
|
}
|
|
int
|
raw3270_reset(struct raw3270_view *view)
|
{
|
struct raw3270 *rp;
|
int rc;
|
|
rp = view->dev;
|
if (!rp || rp->view != view ||
|
test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
|
rc = -EACCES;
|
else if (!raw3270_state_ready(rp))
|
rc = -EBUSY;
|
else
|
rc = raw3270_reset_device(view->dev);
|
return rc;
|
}
|
|
static void
|
__raw3270_disconnect(struct raw3270 *rp)
|
{
|
struct raw3270_request *rq;
|
struct raw3270_view *view;
|
|
rp->state = RAW3270_STATE_INIT;
|
rp->view = &rp->init_view;
|
/* Cancel all queued requests */
|
while (!list_empty(&rp->req_queue)) {
|
rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
|
view = rq->view;
|
rq->rc = -EACCES;
|
list_del_init(&rq->list);
|
if (rq->callback)
|
rq->callback(rq, rq->callback_data);
|
raw3270_put_view(view);
|
}
|
/* Start from scratch */
|
__raw3270_reset_device(rp);
|
}
|
|
static void
|
raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
|
struct irb *irb)
|
{
|
struct raw3270 *rp;
|
|
if (rq) {
|
if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
|
if (irb->ecw[0] & SNS0_CMD_REJECT)
|
rq->rc = -EOPNOTSUPP;
|
else
|
rq->rc = -EIO;
|
}
|
}
|
if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
|
/* Queue read modified after attention interrupt */
|
rp = view->dev;
|
raw3270_read_modified(rp);
|
}
|
}
|
|
static struct raw3270_fn raw3270_init_fn = {
|
.intv = raw3270_init_irq
|
};
|
|
/*
|
* Setup new 3270 device.
|
*/
|
static int
|
raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc)
|
{
|
struct list_head *l;
|
struct raw3270 *tmp;
|
int minor;
|
|
memset(rp, 0, sizeof(struct raw3270));
|
/* Copy ebcdic -> ascii translation table. */
|
memcpy(ascebc, _ascebc, 256);
|
if (tubxcorrect) {
|
/* correct brackets and circumflex */
|
ascebc['['] = 0xad;
|
ascebc[']'] = 0xbd;
|
ascebc['^'] = 0xb0;
|
}
|
rp->ascebc = ascebc;
|
|
/* Set defaults. */
|
rp->rows = 24;
|
rp->cols = 80;
|
|
INIT_LIST_HEAD(&rp->req_queue);
|
INIT_LIST_HEAD(&rp->view_list);
|
|
rp->init_view.dev = rp;
|
rp->init_view.fn = &raw3270_init_fn;
|
rp->view = &rp->init_view;
|
|
/*
|
* Add device to list and find the smallest unused minor
|
* number for it. Note: there is no device with minor 0,
|
* see special case for fs3270.c:fs3270_open().
|
*/
|
mutex_lock(&raw3270_mutex);
|
/* Keep the list sorted. */
|
minor = RAW3270_FIRSTMINOR;
|
rp->minor = -1;
|
list_for_each(l, &raw3270_devices) {
|
tmp = list_entry(l, struct raw3270, list);
|
if (tmp->minor > minor) {
|
rp->minor = minor;
|
__list_add(&rp->list, l->prev, l);
|
break;
|
}
|
minor++;
|
}
|
if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
|
rp->minor = minor;
|
list_add_tail(&rp->list, &raw3270_devices);
|
}
|
mutex_unlock(&raw3270_mutex);
|
/* No free minor number? Then give up. */
|
if (rp->minor == -1)
|
return -EUSERS;
|
rp->cdev = cdev;
|
dev_set_drvdata(&cdev->dev, rp);
|
cdev->handler = raw3270_irq;
|
return 0;
|
}
|
|
#ifdef CONFIG_TN3270_CONSOLE
|
/* Tentative definition - see below for actual definition. */
|
static struct ccw_driver raw3270_ccw_driver;
|
|
/*
|
* Setup 3270 device configured as console.
|
*/
|
struct raw3270 __init *raw3270_setup_console(void)
|
{
|
struct ccw_device *cdev;
|
unsigned long flags;
|
struct raw3270 *rp;
|
char *ascebc;
|
int rc;
|
|
cdev = ccw_device_create_console(&raw3270_ccw_driver);
|
if (IS_ERR(cdev))
|
return ERR_CAST(cdev);
|
|
rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
|
ascebc = kzalloc(256, GFP_KERNEL);
|
rc = raw3270_setup_device(cdev, rp, ascebc);
|
if (rc)
|
return ERR_PTR(rc);
|
set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
|
|
rc = ccw_device_enable_console(cdev);
|
if (rc) {
|
ccw_device_destroy_console(cdev);
|
return ERR_PTR(rc);
|
}
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
do {
|
__raw3270_reset_device(rp);
|
while (!raw3270_state_final(rp)) {
|
ccw_device_wait_idle(rp->cdev);
|
barrier();
|
}
|
} while (rp->state != RAW3270_STATE_READY);
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
return rp;
|
}
|
|
void
|
raw3270_wait_cons_dev(struct raw3270 *rp)
|
{
|
unsigned long flags;
|
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
ccw_device_wait_idle(rp->cdev);
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
}
|
|
#endif
|
|
/*
|
* Create a 3270 device structure.
|
*/
|
static struct raw3270 *
|
raw3270_create_device(struct ccw_device *cdev)
|
{
|
struct raw3270 *rp;
|
char *ascebc;
|
int rc;
|
|
rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
|
if (!rp)
|
return ERR_PTR(-ENOMEM);
|
ascebc = kmalloc(256, GFP_KERNEL);
|
if (!ascebc) {
|
kfree(rp);
|
return ERR_PTR(-ENOMEM);
|
}
|
rc = raw3270_setup_device(cdev, rp, ascebc);
|
if (rc) {
|
kfree(rp->ascebc);
|
kfree(rp);
|
rp = ERR_PTR(rc);
|
}
|
/* Get reference to ccw_device structure. */
|
get_device(&cdev->dev);
|
return rp;
|
}
|
|
/*
|
* Activate a view.
|
*/
|
int
|
raw3270_activate_view(struct raw3270_view *view)
|
{
|
struct raw3270 *rp;
|
struct raw3270_view *oldview, *nv;
|
unsigned long flags;
|
int rc;
|
|
rp = view->dev;
|
if (!rp)
|
return -ENODEV;
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
if (rp->view == view)
|
rc = 0;
|
else if (!raw3270_state_ready(rp))
|
rc = -EBUSY;
|
else if (test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
|
rc = -EACCES;
|
else {
|
oldview = NULL;
|
if (rp->view && rp->view->fn->deactivate) {
|
oldview = rp->view;
|
oldview->fn->deactivate(oldview);
|
}
|
rp->view = view;
|
rc = view->fn->activate(view);
|
if (rc) {
|
/* Didn't work. Try to reactivate the old view. */
|
rp->view = oldview;
|
if (!oldview || oldview->fn->activate(oldview) != 0) {
|
/* Didn't work as well. Try any other view. */
|
list_for_each_entry(nv, &rp->view_list, list)
|
if (nv != view && nv != oldview) {
|
rp->view = nv;
|
if (nv->fn->activate(nv) == 0)
|
break;
|
rp->view = NULL;
|
}
|
}
|
}
|
}
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
return rc;
|
}
|
|
/*
|
* Deactivate current view.
|
*/
|
void
|
raw3270_deactivate_view(struct raw3270_view *view)
|
{
|
unsigned long flags;
|
struct raw3270 *rp;
|
|
rp = view->dev;
|
if (!rp)
|
return;
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
if (rp->view == view) {
|
view->fn->deactivate(view);
|
rp->view = NULL;
|
/* Move deactivated view to end of list. */
|
list_del_init(&view->list);
|
list_add_tail(&view->list, &rp->view_list);
|
/* Try to activate another view. */
|
if (raw3270_state_ready(rp) &&
|
!test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
|
list_for_each_entry(view, &rp->view_list, list) {
|
rp->view = view;
|
if (view->fn->activate(view) == 0)
|
break;
|
rp->view = NULL;
|
}
|
}
|
}
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
}
|
|
/*
|
* Add view to device with minor "minor".
|
*/
|
int
|
raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor, int subclass)
|
{
|
unsigned long flags;
|
struct raw3270 *rp;
|
int rc;
|
|
if (minor <= 0)
|
return -ENODEV;
|
mutex_lock(&raw3270_mutex);
|
rc = -ENODEV;
|
list_for_each_entry(rp, &raw3270_devices, list) {
|
if (rp->minor != minor)
|
continue;
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
atomic_set(&view->ref_count, 2);
|
view->dev = rp;
|
view->fn = fn;
|
view->model = rp->model;
|
view->rows = rp->rows;
|
view->cols = rp->cols;
|
view->ascebc = rp->ascebc;
|
spin_lock_init(&view->lock);
|
lockdep_set_subclass(&view->lock, subclass);
|
list_add(&view->list, &rp->view_list);
|
rc = 0;
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
break;
|
}
|
mutex_unlock(&raw3270_mutex);
|
return rc;
|
}
|
|
/*
|
* Find specific view of device with minor "minor".
|
*/
|
struct raw3270_view *
|
raw3270_find_view(struct raw3270_fn *fn, int minor)
|
{
|
struct raw3270 *rp;
|
struct raw3270_view *view, *tmp;
|
unsigned long flags;
|
|
mutex_lock(&raw3270_mutex);
|
view = ERR_PTR(-ENODEV);
|
list_for_each_entry(rp, &raw3270_devices, list) {
|
if (rp->minor != minor)
|
continue;
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
list_for_each_entry(tmp, &rp->view_list, list) {
|
if (tmp->fn == fn) {
|
raw3270_get_view(tmp);
|
view = tmp;
|
break;
|
}
|
}
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
break;
|
}
|
mutex_unlock(&raw3270_mutex);
|
return view;
|
}
|
|
/*
|
* Remove view from device and free view structure via call to view->fn->free.
|
*/
|
void
|
raw3270_del_view(struct raw3270_view *view)
|
{
|
unsigned long flags;
|
struct raw3270 *rp;
|
struct raw3270_view *nv;
|
|
rp = view->dev;
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
if (rp->view == view) {
|
view->fn->deactivate(view);
|
rp->view = NULL;
|
}
|
list_del_init(&view->list);
|
if (!rp->view && raw3270_state_ready(rp) &&
|
!test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
|
/* Try to activate another view. */
|
list_for_each_entry(nv, &rp->view_list, list) {
|
if (nv->fn->activate(nv) == 0) {
|
rp->view = nv;
|
break;
|
}
|
}
|
}
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
/* Wait for reference counter to drop to zero. */
|
atomic_dec(&view->ref_count);
|
wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
|
if (view->fn->free)
|
view->fn->free(view);
|
}
|
|
/*
|
* Remove a 3270 device structure.
|
*/
|
static void
|
raw3270_delete_device(struct raw3270 *rp)
|
{
|
struct ccw_device *cdev;
|
|
/* Remove from device chain. */
|
mutex_lock(&raw3270_mutex);
|
list_del_init(&rp->list);
|
mutex_unlock(&raw3270_mutex);
|
|
/* Disconnect from ccw_device. */
|
cdev = rp->cdev;
|
rp->cdev = NULL;
|
dev_set_drvdata(&cdev->dev, NULL);
|
cdev->handler = NULL;
|
|
/* Put ccw_device structure. */
|
put_device(&cdev->dev);
|
|
/* Now free raw3270 structure. */
|
kfree(rp->ascebc);
|
kfree(rp);
|
}
|
|
static int
|
raw3270_probe (struct ccw_device *cdev)
|
{
|
return 0;
|
}
|
|
/*
|
* Additional attributes for a 3270 device
|
*/
|
static ssize_t
|
raw3270_model_show(struct device *dev, struct device_attribute *attr, char *buf)
|
{
|
return snprintf(buf, PAGE_SIZE, "%i\n",
|
((struct raw3270 *) dev_get_drvdata(dev))->model);
|
}
|
static DEVICE_ATTR(model, 0444, raw3270_model_show, NULL);
|
|
static ssize_t
|
raw3270_rows_show(struct device *dev, struct device_attribute *attr, char *buf)
|
{
|
return snprintf(buf, PAGE_SIZE, "%i\n",
|
((struct raw3270 *) dev_get_drvdata(dev))->rows);
|
}
|
static DEVICE_ATTR(rows, 0444, raw3270_rows_show, NULL);
|
|
static ssize_t
|
raw3270_columns_show(struct device *dev, struct device_attribute *attr, char *buf)
|
{
|
return snprintf(buf, PAGE_SIZE, "%i\n",
|
((struct raw3270 *) dev_get_drvdata(dev))->cols);
|
}
|
static DEVICE_ATTR(columns, 0444, raw3270_columns_show, NULL);
|
|
static struct attribute * raw3270_attrs[] = {
|
&dev_attr_model.attr,
|
&dev_attr_rows.attr,
|
&dev_attr_columns.attr,
|
NULL,
|
};
|
|
static const struct attribute_group raw3270_attr_group = {
|
.attrs = raw3270_attrs,
|
};
|
|
static int raw3270_create_attributes(struct raw3270 *rp)
|
{
|
return sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
|
}
|
|
/*
|
* Notifier for device addition/removal
|
*/
|
static LIST_HEAD(raw3270_notifier);
|
|
int raw3270_register_notifier(struct raw3270_notifier *notifier)
|
{
|
struct raw3270 *rp;
|
|
mutex_lock(&raw3270_mutex);
|
list_add_tail(¬ifier->list, &raw3270_notifier);
|
list_for_each_entry(rp, &raw3270_devices, list)
|
notifier->create(rp->minor);
|
mutex_unlock(&raw3270_mutex);
|
return 0;
|
}
|
|
void raw3270_unregister_notifier(struct raw3270_notifier *notifier)
|
{
|
struct raw3270 *rp;
|
|
mutex_lock(&raw3270_mutex);
|
list_for_each_entry(rp, &raw3270_devices, list)
|
notifier->destroy(rp->minor);
|
list_del(¬ifier->list);
|
mutex_unlock(&raw3270_mutex);
|
}
|
|
/*
|
* Set 3270 device online.
|
*/
|
static int
|
raw3270_set_online (struct ccw_device *cdev)
|
{
|
struct raw3270_notifier *np;
|
struct raw3270 *rp;
|
int rc;
|
|
rp = raw3270_create_device(cdev);
|
if (IS_ERR(rp))
|
return PTR_ERR(rp);
|
rc = raw3270_create_attributes(rp);
|
if (rc)
|
goto failure;
|
raw3270_reset_device(rp);
|
mutex_lock(&raw3270_mutex);
|
list_for_each_entry(np, &raw3270_notifier, list)
|
np->create(rp->minor);
|
mutex_unlock(&raw3270_mutex);
|
return 0;
|
|
failure:
|
raw3270_delete_device(rp);
|
return rc;
|
}
|
|
/*
|
* Remove 3270 device structure.
|
*/
|
static void
|
raw3270_remove (struct ccw_device *cdev)
|
{
|
unsigned long flags;
|
struct raw3270 *rp;
|
struct raw3270_view *v;
|
struct raw3270_notifier *np;
|
|
rp = dev_get_drvdata(&cdev->dev);
|
/*
|
* _remove is the opposite of _probe; it's probe that
|
* should set up rp. raw3270_remove gets entered for
|
* devices even if they haven't been varied online.
|
* Thus, rp may validly be NULL here.
|
*/
|
if (rp == NULL)
|
return;
|
|
sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);
|
|
/* Deactivate current view and remove all views. */
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
if (rp->view) {
|
if (rp->view->fn->deactivate)
|
rp->view->fn->deactivate(rp->view);
|
rp->view = NULL;
|
}
|
while (!list_empty(&rp->view_list)) {
|
v = list_entry(rp->view_list.next, struct raw3270_view, list);
|
if (v->fn->release)
|
v->fn->release(v);
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
raw3270_del_view(v);
|
spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
|
}
|
spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
|
|
mutex_lock(&raw3270_mutex);
|
list_for_each_entry(np, &raw3270_notifier, list)
|
np->destroy(rp->minor);
|
mutex_unlock(&raw3270_mutex);
|
|
/* Reset 3270 device. */
|
raw3270_reset_device(rp);
|
/* And finally remove it. */
|
raw3270_delete_device(rp);
|
}
|
|
/*
|
* Set 3270 device offline.
|
*/
|
static int
|
raw3270_set_offline (struct ccw_device *cdev)
|
{
|
struct raw3270 *rp;
|
|
rp = dev_get_drvdata(&cdev->dev);
|
if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
|
return -EBUSY;
|
raw3270_remove(cdev);
|
return 0;
|
}
|
|
static int raw3270_pm_stop(struct ccw_device *cdev)
|
{
|
struct raw3270 *rp;
|
struct raw3270_view *view;
|
unsigned long flags;
|
|
rp = dev_get_drvdata(&cdev->dev);
|
if (!rp)
|
return 0;
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
if (rp->view && rp->view->fn->deactivate)
|
rp->view->fn->deactivate(rp->view);
|
if (!test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) {
|
/*
|
* Release tty and fullscreen for all non-console
|
* devices.
|
*/
|
list_for_each_entry(view, &rp->view_list, list) {
|
if (view->fn->release)
|
view->fn->release(view);
|
}
|
}
|
set_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
return 0;
|
}
|
|
static int raw3270_pm_start(struct ccw_device *cdev)
|
{
|
struct raw3270 *rp;
|
unsigned long flags;
|
|
rp = dev_get_drvdata(&cdev->dev);
|
if (!rp)
|
return 0;
|
spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
|
clear_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
|
if (rp->view && rp->view->fn->activate)
|
rp->view->fn->activate(rp->view);
|
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
|
return 0;
|
}
|
|
void raw3270_pm_unfreeze(struct raw3270_view *view)
|
{
|
#ifdef CONFIG_TN3270_CONSOLE
|
struct raw3270 *rp;
|
|
rp = view->dev;
|
if (rp && test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
|
ccw_device_force_console(rp->cdev);
|
#endif
|
}
|
|
static struct ccw_device_id raw3270_id[] = {
|
{ CCW_DEVICE(0x3270, 0) },
|
{ CCW_DEVICE(0x3271, 0) },
|
{ CCW_DEVICE(0x3272, 0) },
|
{ CCW_DEVICE(0x3273, 0) },
|
{ CCW_DEVICE(0x3274, 0) },
|
{ CCW_DEVICE(0x3275, 0) },
|
{ CCW_DEVICE(0x3276, 0) },
|
{ CCW_DEVICE(0x3277, 0) },
|
{ CCW_DEVICE(0x3278, 0) },
|
{ CCW_DEVICE(0x3279, 0) },
|
{ CCW_DEVICE(0x3174, 0) },
|
{ /* end of list */ },
|
};
|
|
static struct ccw_driver raw3270_ccw_driver = {
|
.driver = {
|
.name = "3270",
|
.owner = THIS_MODULE,
|
},
|
.ids = raw3270_id,
|
.probe = &raw3270_probe,
|
.remove = &raw3270_remove,
|
.set_online = &raw3270_set_online,
|
.set_offline = &raw3270_set_offline,
|
.freeze = &raw3270_pm_stop,
|
.thaw = &raw3270_pm_start,
|
.restore = &raw3270_pm_start,
|
.int_class = IRQIO_C70,
|
};
|
|
static int
|
raw3270_init(void)
|
{
|
struct raw3270 *rp;
|
int rc;
|
|
if (raw3270_registered)
|
return 0;
|
raw3270_registered = 1;
|
rc = ccw_driver_register(&raw3270_ccw_driver);
|
if (rc == 0) {
|
/* Create attributes for early (= console) device. */
|
mutex_lock(&raw3270_mutex);
|
class3270 = class_create(THIS_MODULE, "3270");
|
list_for_each_entry(rp, &raw3270_devices, list) {
|
get_device(&rp->cdev->dev);
|
raw3270_create_attributes(rp);
|
}
|
mutex_unlock(&raw3270_mutex);
|
}
|
return rc;
|
}
|
|
static void
|
raw3270_exit(void)
|
{
|
ccw_driver_unregister(&raw3270_ccw_driver);
|
class_destroy(class3270);
|
}
|
|
MODULE_LICENSE("GPL");
|
|
module_init(raw3270_init);
|
module_exit(raw3270_exit);
|
|
EXPORT_SYMBOL(class3270);
|
EXPORT_SYMBOL(raw3270_request_alloc);
|
EXPORT_SYMBOL(raw3270_request_free);
|
EXPORT_SYMBOL(raw3270_request_reset);
|
EXPORT_SYMBOL(raw3270_request_set_cmd);
|
EXPORT_SYMBOL(raw3270_request_add_data);
|
EXPORT_SYMBOL(raw3270_request_set_data);
|
EXPORT_SYMBOL(raw3270_request_set_idal);
|
EXPORT_SYMBOL(raw3270_buffer_address);
|
EXPORT_SYMBOL(raw3270_add_view);
|
EXPORT_SYMBOL(raw3270_del_view);
|
EXPORT_SYMBOL(raw3270_find_view);
|
EXPORT_SYMBOL(raw3270_activate_view);
|
EXPORT_SYMBOL(raw3270_deactivate_view);
|
EXPORT_SYMBOL(raw3270_start);
|
EXPORT_SYMBOL(raw3270_start_locked);
|
EXPORT_SYMBOL(raw3270_start_irq);
|
EXPORT_SYMBOL(raw3270_reset);
|
EXPORT_SYMBOL(raw3270_register_notifier);
|
EXPORT_SYMBOL(raw3270_unregister_notifier);
|
EXPORT_SYMBOL(raw3270_wait_queue);
|
