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v6.8
   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * IBM/3270 Driver - core functions.
   4 *
   5 * Author(s):
   6 *   Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
   7 *   Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
   8 *     Copyright IBM Corp. 2003, 2009
   9 */
  10
 
  11#include <linux/module.h>
  12#include <linux/err.h>
  13#include <linux/init.h>
  14#include <linux/interrupt.h>
  15#include <linux/list.h>
  16#include <linux/slab.h>
  17#include <linux/types.h>
  18#include <linux/wait.h>
  19
  20#include <asm/ccwdev.h>
  21#include <asm/cio.h>
  22#include <asm/ebcdic.h>
  23#include <asm/diag.h>
  24
  25#include "raw3270.h"
  26
  27#include <linux/major.h>
  28#include <linux/kdev_t.h>
  29#include <linux/device.h>
  30#include <linux/mutex.h>
  31
  32struct class *class3270;
  33EXPORT_SYMBOL(class3270);
  34
  35/* The main 3270 data structure. */
  36struct raw3270 {
  37	struct list_head list;
  38	struct ccw_device *cdev;
  39	int minor;
  40
  41	int model, rows, cols;
  42	int old_model, old_rows, old_cols;
  43	unsigned int state;
  44	unsigned long flags;
  45
  46	struct list_head req_queue;	/* Request queue. */
  47	struct list_head view_list;	/* List of available views. */
  48	struct raw3270_view *view;	/* Active view. */
  49
  50	struct timer_list timer;	/* Device timer. */
  51
  52	unsigned char *ascebc;		/* ascii -> ebcdic table */
 
 
  53
  54	struct raw3270_view init_view;
  55	struct raw3270_request init_reset;
  56	struct raw3270_request init_readpart;
  57	struct raw3270_request init_readmod;
  58	unsigned char init_data[256];
  59	struct work_struct resize_work;
  60};
  61
  62/* raw3270->state */
  63#define RAW3270_STATE_INIT	0	/* Initial state */
  64#define RAW3270_STATE_RESET	1	/* Reset command is pending */
  65#define RAW3270_STATE_W4ATTN	2	/* Wait for attention interrupt */
  66#define RAW3270_STATE_READMOD	3	/* Read partition is pending */
  67#define RAW3270_STATE_READY	4	/* Device is usable by views */
  68
  69/* raw3270->flags */
  70#define RAW3270_FLAGS_14BITADDR	0	/* 14-bit buffer addresses */
  71#define RAW3270_FLAGS_BUSY	1	/* Device busy, leave it alone */
  72#define RAW3270_FLAGS_CONSOLE	2	/* Device is the console. */
 
 
 
  73
  74/* Semaphore to protect global data of raw3270 (devices, views, etc). */
  75static DEFINE_MUTEX(raw3270_mutex);
  76
  77/* List of 3270 devices. */
  78static LIST_HEAD(raw3270_devices);
  79
  80/*
  81 * Flag to indicate if the driver has been registered. Some operations
  82 * like waiting for the end of i/o need to be done differently as long
  83 * as the kernel is still starting up (console support).
  84 */
  85static int raw3270_registered;
  86
  87/* Module parameters */
  88static bool tubxcorrect;
  89module_param(tubxcorrect, bool, 0);
  90
  91/*
  92 * Wait queue for device init/delete, view delete.
  93 */
  94DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);
  95EXPORT_SYMBOL(raw3270_wait_queue);
  96
  97static void __raw3270_disconnect(struct raw3270 *rp);
  98
  99/*
 100 * Encode array for 12 bit 3270 addresses.
 101 */
 102static unsigned char raw3270_ebcgraf[64] =	{
 103	0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
 104	0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
 105	0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
 106	0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
 107	0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
 108	0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
 109	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
 110	0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f
 111};
 112
 113static inline int raw3270_state_ready(struct raw3270 *rp)
 
 114{
 115	return rp->state == RAW3270_STATE_READY;
 116}
 117
 118void raw3270_buffer_address(struct raw3270 *rp, char *cp, int x, int y)
 119{
 120	int addr;
 121
 122	if (x < 0)
 123		x = max_t(int, 0, rp->view->cols + x);
 124	if (y < 0)
 125		y = max_t(int, 0, rp->view->rows + y);
 126	addr = (y * rp->view->cols) + x;
 127	if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) {
 128		cp[0] = (addr >> 8) & 0x3f;
 129		cp[1] = addr & 0xff;
 130	} else {
 131		cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f];
 132		cp[1] = raw3270_ebcgraf[addr & 0x3f];
 133	}
 134}
 135EXPORT_SYMBOL(raw3270_buffer_address);
 136
 137/*
 138 * Allocate a new 3270 ccw request
 139 */
 140struct raw3270_request *raw3270_request_alloc(size_t size)
 
 141{
 142	struct raw3270_request *rq;
 143
 144	/* Allocate request structure */
 145	rq = kzalloc(sizeof(*rq), GFP_KERNEL | GFP_DMA);
 146	if (!rq)
 147		return ERR_PTR(-ENOMEM);
 148
 149	/* alloc output buffer. */
 150	if (size > 0) {
 151		rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA);
 152		if (!rq->buffer) {
 153			kfree(rq);
 154			return ERR_PTR(-ENOMEM);
 155		}
 156	}
 157	rq->size = size;
 158	INIT_LIST_HEAD(&rq->list);
 159
 160	/*
 161	 * Setup ccw.
 162	 */
 163	rq->ccw.cda = __pa(rq->buffer);
 164	rq->ccw.flags = CCW_FLAG_SLI;
 165
 166	return rq;
 167}
 168EXPORT_SYMBOL(raw3270_request_alloc);
 169
 170/*
 171 * Free 3270 ccw request
 172 */
 173void raw3270_request_free(struct raw3270_request *rq)
 
 174{
 175	kfree(rq->buffer);
 176	kfree(rq);
 177}
 178EXPORT_SYMBOL(raw3270_request_free);
 179
 180/*
 181 * Reset request to initial state.
 182 */
 183int raw3270_request_reset(struct raw3270_request *rq)
 
 184{
 185	if (WARN_ON_ONCE(!list_empty(&rq->list)))
 186		return -EBUSY;
 187	rq->ccw.cmd_code = 0;
 188	rq->ccw.count = 0;
 189	rq->ccw.cda = __pa(rq->buffer);
 190	rq->ccw.flags = CCW_FLAG_SLI;
 191	rq->rescnt = 0;
 192	rq->rc = 0;
 193	return 0;
 194}
 195EXPORT_SYMBOL(raw3270_request_reset);
 196
 197/*
 198 * Set command code to ccw of a request.
 199 */
 200void raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd)
 
 201{
 202	rq->ccw.cmd_code = cmd;
 203}
 204EXPORT_SYMBOL(raw3270_request_set_cmd);
 205
 206/*
 207 * Add data fragment to output buffer.
 208 */
 209int raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size)
 
 210{
 211	if (size + rq->ccw.count > rq->size)
 212		return -E2BIG;
 213	memcpy(rq->buffer + rq->ccw.count, data, size);
 214	rq->ccw.count += size;
 215	return 0;
 216}
 217EXPORT_SYMBOL(raw3270_request_add_data);
 218
 219/*
 220 * Set address/length pair to ccw of a request.
 221 */
 222void raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size)
 
 223{
 224	rq->ccw.cda = __pa(data);
 225	rq->ccw.count = size;
 226}
 227EXPORT_SYMBOL(raw3270_request_set_data);
 228
 229/*
 230 * Set idal buffer to ccw of a request.
 231 */
 232void raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib)
 
 233{
 234	rq->ccw.cda = __pa(ib->data);
 235	rq->ccw.count = ib->size;
 236	rq->ccw.flags |= CCW_FLAG_IDA;
 237}
 238EXPORT_SYMBOL(raw3270_request_set_idal);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 239
 240/*
 241 * Add the request to the request queue, try to start it if the
 242 * 3270 device is idle. Return without waiting for end of i/o.
 243 */
 244static int __raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
 245			   struct raw3270_request *rq)
 
 246{
 247	rq->view = view;
 248	raw3270_get_view(view);
 249	if (list_empty(&rp->req_queue) &&
 250	    !test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
 251		/* No other requests are on the queue. Start this one. */
 252		rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
 253					  (unsigned long)rq, 0, 0);
 254		if (rq->rc) {
 255			raw3270_put_view(view);
 256			return rq->rc;
 257		}
 258	}
 259	list_add_tail(&rq->list, &rp->req_queue);
 260	return 0;
 261}
 262
 263int raw3270_view_active(struct raw3270_view *view)
 264{
 265	struct raw3270 *rp = view->dev;
 266
 267	return rp && rp->view == view;
 268}
 269
 270int raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
 271{
 272	unsigned long flags;
 273	struct raw3270 *rp;
 274	int rc;
 275
 276	spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
 277	rp = view->dev;
 278	if (!rp || rp->view != view)
 
 279		rc = -EACCES;
 280	else if (!raw3270_state_ready(rp))
 281		rc = -EBUSY;
 282	else
 283		rc =  __raw3270_start(rp, view, rq);
 284	spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
 285	return rc;
 286}
 287EXPORT_SYMBOL(raw3270_start);
 288
 289int raw3270_start_request(struct raw3270_view *view, struct raw3270_request *rq,
 290			  int cmd, void *data, size_t len)
 291{
 292	int rc;
 293
 294	rc = raw3270_request_reset(rq);
 295	if (rc)
 296		return rc;
 297	raw3270_request_set_cmd(rq, cmd);
 298	rc = raw3270_request_add_data(rq, data, len);
 299	if (rc)
 300		return rc;
 301	return raw3270_start(view, rq);
 302}
 303EXPORT_SYMBOL(raw3270_start_request);
 304
 305int raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
 
 306{
 307	struct raw3270 *rp;
 308	int rc;
 309
 310	rp = view->dev;
 311	if (!rp || rp->view != view)
 
 312		rc = -EACCES;
 313	else if (!raw3270_state_ready(rp))
 314		rc = -EBUSY;
 315	else
 316		rc =  __raw3270_start(rp, view, rq);
 317	return rc;
 318}
 319EXPORT_SYMBOL(raw3270_start_locked);
 320
 321int raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
 
 322{
 323	struct raw3270 *rp;
 324
 325	rp = view->dev;
 326	rq->view = view;
 327	raw3270_get_view(view);
 328	list_add_tail(&rq->list, &rp->req_queue);
 329	return 0;
 330}
 331EXPORT_SYMBOL(raw3270_start_irq);
 332
 333/*
 334 * 3270 interrupt routine, called from the ccw_device layer
 335 */
 336static void raw3270_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
 
 337{
 338	struct raw3270 *rp;
 339	struct raw3270_view *view;
 340	struct raw3270_request *rq;
 
 341
 
 342	rp = dev_get_drvdata(&cdev->dev);
 343	if (!rp)
 344		return;
 345	rq = (struct raw3270_request *)intparm;
 346	view = rq ? rq->view : rp->view;
 347
 348	if (!IS_ERR(irb)) {
 
 
 
 
 
 
 349		/* Handle CE-DE-UE and subsequent UDE */
 350		if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END)
 
 
 
 
 351			clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
 352		if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END |
 353					    DEV_STAT_DEV_END |
 354					    DEV_STAT_UNIT_EXCEP))
 355			set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
 356		/* Handle disconnected devices */
 357		if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
 358		    (irb->ecw[0] & SNS0_INTERVENTION_REQ)) {
 359			set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
 360			if (rp->state > RAW3270_STATE_RESET)
 361				__raw3270_disconnect(rp);
 362		}
 363		/* Call interrupt handler of the view */
 364		if (view)
 365			view->fn->intv(view, rq, irb);
 366	}
 367
 368	if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags))
 369		/* Device busy, do not start I/O */
 
 
 
 
 
 
 370		return;
 371
 372	if (rq && !list_empty(&rq->list)) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 373		/* The request completed, remove from queue and do callback. */
 374		list_del_init(&rq->list);
 375		if (rq->callback)
 376			rq->callback(rq, rq->callback_data);
 377		/* Do put_device for get_device in raw3270_start. */
 378		raw3270_put_view(view);
 379	}
 380
 381	/*
 382	 * Try to start each request on request queue until one is
 383	 * started successful.
 384	 */
 385	while (!list_empty(&rp->req_queue)) {
 386		rq = list_entry(rp->req_queue.next, struct raw3270_request, list);
 387		rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
 388					  (unsigned long)rq, 0, 0);
 389		if (rq->rc == 0)
 390			break;
 391		/* Start failed. Remove request and do callback. */
 392		list_del_init(&rq->list);
 393		if (rq->callback)
 394			rq->callback(rq, rq->callback_data);
 395		/* Do put_device for get_device in raw3270_start. */
 396		raw3270_put_view(view);
 397	}
 398}
 399
 400/*
 401 * To determine the size of the 3270 device we need to do:
 402 * 1) send a 'read partition' data stream to the device
 403 * 2) wait for the attn interrupt that precedes the query reply
 404 * 3) do a read modified to get the query reply
 405 * To make things worse we have to cope with intervention
 406 * required (3270 device switched to 'stand-by') and command
 407 * rejects (old devices that can't do 'read partition').
 408 */
 
 409struct raw3270_ua {	/* Query Reply structure for Usable Area */
 410	struct {	/* Usable Area Query Reply Base */
 411		short l;	/* Length of this structured field */
 412		char  sfid;	/* 0x81 if Query Reply */
 413		char  qcode;	/* 0x81 if Usable Area */
 414		char  flags0;
 415		char  flags1;
 416		short w;	/* Width of usable area */
 417		short h;	/* Heigth of usavle area */
 418		char  units;	/* 0x00:in; 0x01:mm */
 419		int   xr;
 420		int   yr;
 421		char  aw;
 422		char  ah;
 423		short buffsz;	/* Character buffer size, bytes */
 424		char  xmin;
 425		char  ymin;
 426		char  xmax;
 427		char  ymax;
 428	} __packed uab;
 429	struct {	/* Alternate Usable Area Self-Defining Parameter */
 430		char  l;	/* Length of this Self-Defining Parm */
 431		char  sdpid;	/* 0x02 if Alternate Usable Area */
 432		char  res;
 433		char  auaid;	/* 0x01 is Id for the A U A */
 434		short wauai;	/* Width of AUAi */
 435		short hauai;	/* Height of AUAi */
 436		char  auaunits;	/* 0x00:in, 0x01:mm */
 437		int   auaxr;
 438		int   auayr;
 439		char  awauai;
 440		char  ahauai;
 441	} __packed aua;
 442} __packed;
 443
 444static void raw3270_size_device_vm(struct raw3270 *rp)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 445{
 446	int rc, model;
 447	struct ccw_dev_id dev_id;
 448	struct diag210 diag_data;
 449	struct diag8c diag8c_data;
 450
 451	ccw_device_get_id(rp->cdev, &dev_id);
 452	rc = diag8c(&diag8c_data, &dev_id);
 453	if (!rc) {
 454		rp->model = 2;
 455		rp->rows = diag8c_data.height;
 456		rp->cols = diag8c_data.width;
 457		if (diag8c_data.flags & 1)
 458			set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
 459		return;
 460	}
 461
 462	diag_data.vrdcdvno = dev_id.devno;
 463	diag_data.vrdclen = sizeof(struct diag210);
 464	rc = diag210(&diag_data);
 465	model = diag_data.vrdccrmd;
 466	/* Use default model 2 if the size could not be detected */
 467	if (rc || model < 2 || model > 5)
 468		model = 2;
 469	switch (model) {
 470	case 2:
 471		rp->model = model;
 472		rp->rows = 24;
 473		rp->cols = 80;
 474		break;
 475	case 3:
 476		rp->model = model;
 477		rp->rows = 32;
 478		rp->cols = 80;
 479		break;
 480	case 4:
 481		rp->model = model;
 482		rp->rows = 43;
 483		rp->cols = 80;
 484		break;
 485	case 5:
 486		rp->model = model;
 487		rp->rows = 27;
 488		rp->cols = 132;
 489		break;
 
 
 
 490	}
 
 491}
 492
 493static void raw3270_size_device(struct raw3270 *rp, char *init_data)
 
 494{
 
 
 495	struct raw3270_ua *uap;
 
 496
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 497	/* Got a Query Reply */
 498	uap = (struct raw3270_ua *)(init_data + 1);
 499	/* Paranoia check. */
 500	if (init_data[0] != 0x88 || uap->uab.qcode != 0x81) {
 501		/* Couldn't detect size. Use default model 2. */
 502		rp->model = 2;
 503		rp->rows = 24;
 504		rp->cols = 80;
 505		return;
 506	}
 507	/* Copy rows/columns of default Usable Area */
 508	rp->rows = uap->uab.h;
 509	rp->cols = uap->uab.w;
 510	/* Check for 14 bit addressing */
 511	if ((uap->uab.flags0 & 0x0d) == 0x01)
 512		set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
 513	/* Check for Alternate Usable Area */
 514	if (uap->uab.l == sizeof(struct raw3270_ua) &&
 515	    uap->aua.sdpid == 0x02) {
 516		rp->rows = uap->aua.hauai;
 517		rp->cols = uap->aua.wauai;
 518	}
 519	/* Try to find a model. */
 520	rp->model = 0;
 521	if (rp->rows == 24 && rp->cols == 80)
 522		rp->model = 2;
 523	if (rp->rows == 32 && rp->cols == 80)
 524		rp->model = 3;
 525	if (rp->rows == 43 && rp->cols == 80)
 526		rp->model = 4;
 527	if (rp->rows == 27 && rp->cols == 132)
 528		rp->model = 5;
 529}
 530
 531static void raw3270_resize_work(struct work_struct *work)
 
 532{
 533	struct raw3270 *rp = container_of(work, struct raw3270, resize_work);
 534	struct raw3270_view *view;
 535
 536	/* Notify views about new size */
 537	list_for_each_entry(view, &rp->view_list, list) {
 538		if (view->fn->resize)
 539			view->fn->resize(view, rp->model, rp->rows, rp->cols,
 540					 rp->old_model, rp->old_rows, rp->old_cols);
 541	}
 542	rp->old_cols = rp->cols;
 543	rp->old_rows = rp->rows;
 544	rp->old_model = rp->model;
 545	/* Setup processing done, now activate a view */
 546	list_for_each_entry(view, &rp->view_list, list) {
 547		rp->view = view;
 548		if (view->fn->activate(view) == 0)
 549			break;
 550		rp->view = NULL;
 551	}
 552}
 553
 554static void raw3270_size_device_done(struct raw3270 *rp)
 555{
 
 
 
 
 
 
 556	rp->view = NULL;
 557	rp->state = RAW3270_STATE_READY;
 558	schedule_work(&rp->resize_work);
 559}
 560
 561void raw3270_read_modified_cb(struct raw3270_request *rq, void *data)
 562{
 563	struct raw3270 *rp = rq->view->dev;
 564
 565	raw3270_size_device(rp, data);
 566	raw3270_size_device_done(rp);
 567}
 568EXPORT_SYMBOL(raw3270_read_modified_cb);
 569
 570static void raw3270_read_modified(struct raw3270 *rp)
 571{
 572	if (rp->state != RAW3270_STATE_W4ATTN)
 573		return;
 574	/* Use 'read modified' to get the result of a read partition. */
 575	memset(&rp->init_readmod, 0, sizeof(rp->init_readmod));
 576	memset(&rp->init_data, 0, sizeof(rp->init_data));
 577	rp->init_readmod.ccw.cmd_code = TC_READMOD;
 578	rp->init_readmod.ccw.flags = CCW_FLAG_SLI;
 579	rp->init_readmod.ccw.count = sizeof(rp->init_data);
 580	rp->init_readmod.ccw.cda = (__u32)__pa(rp->init_data);
 581	rp->init_readmod.callback = raw3270_read_modified_cb;
 582	rp->init_readmod.callback_data = rp->init_data;
 583	rp->state = RAW3270_STATE_READMOD;
 584	raw3270_start_irq(&rp->init_view, &rp->init_readmod);
 585}
 586
 587static void raw3270_writesf_readpart(struct raw3270 *rp)
 588{
 589	static const unsigned char wbuf[] = {
 590		0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81
 591	};
 592
 593	/* Store 'read partition' data stream to init_data */
 594	memset(&rp->init_readpart, 0, sizeof(rp->init_readpart));
 595	memset(&rp->init_data, 0, sizeof(rp->init_data));
 596	memcpy(&rp->init_data, wbuf, sizeof(wbuf));
 597	rp->init_readpart.ccw.cmd_code = TC_WRITESF;
 598	rp->init_readpart.ccw.flags = CCW_FLAG_SLI;
 599	rp->init_readpart.ccw.count = sizeof(wbuf);
 600	rp->init_readpart.ccw.cda = (__u32)__pa(&rp->init_data);
 601	rp->state = RAW3270_STATE_W4ATTN;
 602	raw3270_start_irq(&rp->init_view, &rp->init_readpart);
 603}
 604
 605/*
 606 * Device reset
 607 */
 608static void raw3270_reset_device_cb(struct raw3270_request *rq, void *data)
 609{
 610	struct raw3270 *rp = rq->view->dev;
 611
 612	if (rp->state != RAW3270_STATE_RESET)
 613		return;
 614	if (rq->rc) {
 615		/* Reset command failed. */
 616		rp->state = RAW3270_STATE_INIT;
 617	} else if (MACHINE_IS_VM) {
 618		raw3270_size_device_vm(rp);
 619		raw3270_size_device_done(rp);
 620	} else {
 621		raw3270_writesf_readpart(rp);
 
 
 
 
 622	}
 623	memset(&rp->init_reset, 0, sizeof(rp->init_reset));
 624}
 625
 626static int __raw3270_reset_device(struct raw3270 *rp)
 627{
 628	int rc;
 629
 630	/* Check if reset is already pending */
 631	if (rp->init_reset.view)
 632		return -EBUSY;
 633	/* Store reset data stream to init_data/init_reset */
 634	rp->init_data[0] = TW_KR;
 635	rp->init_reset.ccw.cmd_code = TC_EWRITEA;
 636	rp->init_reset.ccw.flags = CCW_FLAG_SLI;
 637	rp->init_reset.ccw.count = 1;
 638	rp->init_reset.ccw.cda = (__u32)__pa(rp->init_data);
 639	rp->init_reset.callback = raw3270_reset_device_cb;
 640	rc = __raw3270_start(rp, &rp->init_view, &rp->init_reset);
 641	if (rc == 0 && rp->state == RAW3270_STATE_INIT)
 642		rp->state = RAW3270_STATE_RESET;
 643	return rc;
 644}
 645
 646static int raw3270_reset_device(struct raw3270 *rp)
 
 647{
 648	unsigned long flags;
 649	int rc;
 650
 651	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 652	rc = __raw3270_reset_device(rp);
 653	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 
 
 
 
 
 
 
 
 
 
 
 
 
 654	return rc;
 655}
 656
 657int raw3270_reset(struct raw3270_view *view)
 
 658{
 659	struct raw3270 *rp;
 660	int rc;
 661
 662	rp = view->dev;
 663	if (!rp || rp->view != view)
 
 664		rc = -EACCES;
 665	else if (!raw3270_state_ready(rp))
 666		rc = -EBUSY;
 667	else
 668		rc = raw3270_reset_device(view->dev);
 669	return rc;
 670}
 671EXPORT_SYMBOL(raw3270_reset);
 672
 673static void __raw3270_disconnect(struct raw3270 *rp)
 674{
 675	struct raw3270_request *rq;
 676	struct raw3270_view *view;
 677
 678	rp->state = RAW3270_STATE_INIT;
 679	rp->view = &rp->init_view;
 680	/* Cancel all queued requests */
 681	while (!list_empty(&rp->req_queue)) {
 682		rq = list_entry(rp->req_queue.next, struct raw3270_request, list);
 683		view = rq->view;
 684		rq->rc = -EACCES;
 685		list_del_init(&rq->list);
 686		if (rq->callback)
 687			rq->callback(rq, rq->callback_data);
 688		raw3270_put_view(view);
 689	}
 690	/* Start from scratch */
 691	__raw3270_reset_device(rp);
 692}
 693
 694static void raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
 695			     struct irb *irb)
 696{
 697	struct raw3270 *rp;
 698
 699	if (rq) {
 700		if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 701			if (irb->ecw[0] & SNS0_CMD_REJECT)
 702				rq->rc = -EOPNOTSUPP;
 703			else
 704				rq->rc = -EIO;
 705		}
 706	}
 707	if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
 708		/* Queue read modified after attention interrupt */
 709		rp = view->dev;
 710		raw3270_read_modified(rp);
 711	}
 712}
 713
 714static struct raw3270_fn raw3270_init_fn = {
 715	.intv = raw3270_init_irq
 716};
 717
 718/*
 719 * Setup new 3270 device.
 720 */
 721static int raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp,
 722				char *ascebc)
 723{
 724	struct list_head *l;
 725	struct raw3270 *tmp;
 726	int minor;
 727
 728	memset(rp, 0, sizeof(struct raw3270));
 729	/* Copy ebcdic -> ascii translation table. */
 730	memcpy(ascebc, _ascebc, 256);
 731	if (tubxcorrect) {
 732		/* correct brackets and circumflex */
 733		ascebc['['] = 0xad;
 734		ascebc[']'] = 0xbd;
 735		ascebc['^'] = 0xb0;
 736	}
 737	rp->ascebc = ascebc;
 738
 739	/* Set defaults. */
 740	rp->rows = 24;
 741	rp->cols = 80;
 742	rp->old_rows = rp->rows;
 743	rp->old_cols = rp->cols;
 744
 745	INIT_LIST_HEAD(&rp->req_queue);
 746	INIT_LIST_HEAD(&rp->view_list);
 747
 748	rp->init_view.dev = rp;
 749	rp->init_view.fn = &raw3270_init_fn;
 750	rp->view = &rp->init_view;
 751	INIT_WORK(&rp->resize_work, raw3270_resize_work);
 752
 753	/*
 754	 * Add device to list and find the smallest unused minor
 755	 * number for it. Note: there is no device with minor 0,
 756	 * see special case for fs3270.c:fs3270_open().
 757	 */
 758	mutex_lock(&raw3270_mutex);
 759	/* Keep the list sorted. */
 760	minor = RAW3270_FIRSTMINOR;
 761	rp->minor = -1;
 762	list_for_each(l, &raw3270_devices) {
 763		tmp = list_entry(l, struct raw3270, list);
 764		if (tmp->minor > minor) {
 765			rp->minor = minor;
 766			__list_add(&rp->list, l->prev, l);
 767			break;
 768		}
 769		minor++;
 770	}
 771	if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
 772		rp->minor = minor;
 773		list_add_tail(&rp->list, &raw3270_devices);
 774	}
 775	mutex_unlock(&raw3270_mutex);
 776	/* No free minor number? Then give up. */
 777	if (rp->minor == -1)
 778		return -EUSERS;
 779	rp->cdev = cdev;
 780	dev_set_drvdata(&cdev->dev, rp);
 781	cdev->handler = raw3270_irq;
 782	return 0;
 783}
 784
 785#ifdef CONFIG_TN3270_CONSOLE
 786/* Tentative definition - see below for actual definition. */
 787static struct ccw_driver raw3270_ccw_driver;
 788
 789static inline int raw3270_state_final(struct raw3270 *rp)
 790{
 791	return rp->state == RAW3270_STATE_INIT ||
 792		rp->state == RAW3270_STATE_READY;
 793}
 794
 795/*
 796 * Setup 3270 device configured as console.
 797 */
 798struct raw3270 __init *raw3270_setup_console(void)
 799{
 800	struct ccw_device *cdev;
 801	unsigned long flags;
 802	struct raw3270 *rp;
 803	char *ascebc;
 804	int rc;
 805
 806	cdev = ccw_device_create_console(&raw3270_ccw_driver);
 807	if (IS_ERR(cdev))
 808		return ERR_CAST(cdev);
 809
 810	rp = kzalloc(sizeof(*rp), GFP_KERNEL | GFP_DMA);
 811	ascebc = kzalloc(256, GFP_KERNEL);
 812	rc = raw3270_setup_device(cdev, rp, ascebc);
 813	if (rc)
 814		return ERR_PTR(rc);
 815	set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
 816
 817	rc = ccw_device_enable_console(cdev);
 818	if (rc) {
 819		ccw_device_destroy_console(cdev);
 820		return ERR_PTR(rc);
 821	}
 822
 823	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 824	do {
 825		__raw3270_reset_device(rp);
 826		while (!raw3270_state_final(rp)) {
 827			ccw_device_wait_idle(rp->cdev);
 828			barrier();
 829		}
 830	} while (rp->state != RAW3270_STATE_READY);
 831	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 832	return rp;
 833}
 834
 835void raw3270_wait_cons_dev(struct raw3270 *rp)
 
 836{
 837	unsigned long flags;
 838
 839	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 840	ccw_device_wait_idle(rp->cdev);
 841	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 842}
 843
 844#endif
 845
 846/*
 847 * Create a 3270 device structure.
 848 */
 849static struct raw3270 *raw3270_create_device(struct ccw_device *cdev)
 
 850{
 851	struct raw3270 *rp;
 852	char *ascebc;
 853	int rc;
 854
 855	rp = kzalloc(sizeof(*rp), GFP_KERNEL | GFP_DMA);
 856	if (!rp)
 857		return ERR_PTR(-ENOMEM);
 858	ascebc = kmalloc(256, GFP_KERNEL);
 859	if (!ascebc) {
 860		kfree(rp);
 861		return ERR_PTR(-ENOMEM);
 862	}
 863	rc = raw3270_setup_device(cdev, rp, ascebc);
 864	if (rc) {
 865		kfree(rp->ascebc);
 866		kfree(rp);
 867		rp = ERR_PTR(rc);
 868	}
 869	/* Get reference to ccw_device structure. */
 870	get_device(&cdev->dev);
 871	return rp;
 872}
 873
 874/*
 875 * This helper just validates that it is safe to activate a
 876 * view in the panic() context, due to locking restrictions.
 877 */
 878int raw3270_view_lock_unavailable(struct raw3270_view *view)
 879{
 880	struct raw3270 *rp = view->dev;
 881
 882	if (!rp)
 883		return -ENODEV;
 884	if (spin_is_locked(get_ccwdev_lock(rp->cdev)))
 885		return -EBUSY;
 886	return 0;
 887}
 888
 889static int raw3270_assign_activate_view(struct raw3270 *rp, struct raw3270_view *view)
 890{
 891	rp->view = view;
 892	return view->fn->activate(view);
 893}
 894
 895static int __raw3270_activate_view(struct raw3270 *rp, struct raw3270_view *view)
 896{
 897	struct raw3270_view *oldview = NULL, *nv;
 898	int rc;
 899
 900	if (rp->view == view)
 901		return 0;
 902
 903	if (!raw3270_state_ready(rp))
 904		return -EBUSY;
 905
 906	if (rp->view && rp->view->fn->deactivate) {
 907		oldview = rp->view;
 908		oldview->fn->deactivate(oldview);
 909	}
 910
 911	rc = raw3270_assign_activate_view(rp, view);
 912	if (!rc)
 913		return 0;
 914
 915	/* Didn't work. Try to reactivate the old view. */
 916	if (oldview) {
 917		rc = raw3270_assign_activate_view(rp, oldview);
 918		if (!rc)
 919			return 0;
 920	}
 921
 922	/* Didn't work as well. Try any other view. */
 923	list_for_each_entry(nv, &rp->view_list, list) {
 924		if (nv == view || nv == oldview)
 925			continue;
 926		rc = raw3270_assign_activate_view(rp, nv);
 927		if (!rc)
 928			break;
 929		rp->view = NULL;
 930	}
 931	return rc;
 932}
 933
 934/*
 935 * Activate a view.
 936 */
 937int raw3270_activate_view(struct raw3270_view *view)
 
 938{
 939	struct raw3270 *rp;
 
 940	unsigned long flags;
 941	int rc;
 942
 943	rp = view->dev;
 944	if (!rp)
 945		return -ENODEV;
 946	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 947	rc = __raw3270_activate_view(rp, view);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 948	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 949	return rc;
 950}
 951EXPORT_SYMBOL(raw3270_activate_view);
 952
 953/*
 954 * Deactivate current view.
 955 */
 956void raw3270_deactivate_view(struct raw3270_view *view)
 
 957{
 958	unsigned long flags;
 959	struct raw3270 *rp;
 960
 961	rp = view->dev;
 962	if (!rp)
 963		return;
 964	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 965	if (rp->view == view) {
 966		view->fn->deactivate(view);
 967		rp->view = NULL;
 968		/* Move deactivated view to end of list. */
 969		list_del_init(&view->list);
 970		list_add_tail(&view->list, &rp->view_list);
 971		/* Try to activate another view. */
 972		if (raw3270_state_ready(rp)) {
 
 973			list_for_each_entry(view, &rp->view_list, list) {
 974				rp->view = view;
 975				if (view->fn->activate(view) == 0)
 976					break;
 977				rp->view = NULL;
 978			}
 979		}
 980	}
 981	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 982}
 983EXPORT_SYMBOL(raw3270_deactivate_view);
 984
 985/*
 986 * Add view to device with minor "minor".
 987 */
 988int raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn,
 989		     int minor, int subclass)
 990{
 991	unsigned long flags;
 992	struct raw3270 *rp;
 993	int rc;
 994
 995	if (minor <= 0)
 996		return -ENODEV;
 997	mutex_lock(&raw3270_mutex);
 998	rc = -ENODEV;
 999	list_for_each_entry(rp, &raw3270_devices, list) {
1000		if (rp->minor != minor)
1001			continue;
1002		spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1003		atomic_set(&view->ref_count, 2);
1004		view->dev = rp;
1005		view->fn = fn;
1006		view->model = rp->model;
1007		view->rows = rp->rows;
1008		view->cols = rp->cols;
1009		view->ascebc = rp->ascebc;
1010		spin_lock_init(&view->lock);
1011		lockdep_set_subclass(&view->lock, subclass);
1012		list_add(&view->list, &rp->view_list);
1013		rc = 0;
 
1014		spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1015		break;
1016	}
1017	mutex_unlock(&raw3270_mutex);
1018	return rc;
1019}
1020EXPORT_SYMBOL(raw3270_add_view);
1021
1022/*
1023 * Find specific view of device with minor "minor".
1024 */
1025struct raw3270_view *raw3270_find_view(struct raw3270_fn *fn, int minor)
 
1026{
1027	struct raw3270 *rp;
1028	struct raw3270_view *view, *tmp;
1029	unsigned long flags;
1030
1031	mutex_lock(&raw3270_mutex);
1032	view = ERR_PTR(-ENODEV);
1033	list_for_each_entry(rp, &raw3270_devices, list) {
1034		if (rp->minor != minor)
1035			continue;
1036		spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1037		list_for_each_entry(tmp, &rp->view_list, list) {
1038			if (tmp->fn == fn) {
1039				raw3270_get_view(tmp);
1040				view = tmp;
1041				break;
 
 
 
1042			}
1043		}
1044		spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1045		break;
1046	}
1047	mutex_unlock(&raw3270_mutex);
1048	return view;
1049}
1050EXPORT_SYMBOL(raw3270_find_view);
1051
1052/*
1053 * Remove view from device and free view structure via call to view->fn->free.
1054 */
1055void raw3270_del_view(struct raw3270_view *view)
 
1056{
1057	unsigned long flags;
1058	struct raw3270 *rp;
1059	struct raw3270_view *nv;
1060
1061	rp = view->dev;
1062	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1063	if (rp->view == view) {
1064		view->fn->deactivate(view);
1065		rp->view = NULL;
1066	}
1067	list_del_init(&view->list);
1068	if (!rp->view && raw3270_state_ready(rp)) {
 
1069		/* Try to activate another view. */
1070		list_for_each_entry(nv, &rp->view_list, list) {
1071			if (nv->fn->activate(nv) == 0) {
1072				rp->view = nv;
1073				break;
1074			}
1075		}
1076	}
1077	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1078	/* Wait for reference counter to drop to zero. */
1079	atomic_dec(&view->ref_count);
1080	wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
1081	if (view->fn->free)
1082		view->fn->free(view);
1083}
1084EXPORT_SYMBOL(raw3270_del_view);
1085
1086/*
1087 * Remove a 3270 device structure.
1088 */
1089static void raw3270_delete_device(struct raw3270 *rp)
 
1090{
1091	struct ccw_device *cdev;
1092
1093	/* Remove from device chain. */
1094	mutex_lock(&raw3270_mutex);
 
 
 
 
1095	list_del_init(&rp->list);
1096	mutex_unlock(&raw3270_mutex);
1097
1098	/* Disconnect from ccw_device. */
1099	cdev = rp->cdev;
1100	rp->cdev = NULL;
1101	dev_set_drvdata(&cdev->dev, NULL);
1102	cdev->handler = NULL;
1103
1104	/* Put ccw_device structure. */
1105	put_device(&cdev->dev);
1106
1107	/* Now free raw3270 structure. */
1108	kfree(rp->ascebc);
1109	kfree(rp);
1110}
1111
1112static int raw3270_probe(struct ccw_device *cdev)
 
1113{
1114	return 0;
1115}
1116
1117/*
1118 * Additional attributes for a 3270 device
1119 */
1120static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1121			  char *buf)
1122{
1123	return sysfs_emit(buf, "%i\n",
1124			  ((struct raw3270 *)dev_get_drvdata(dev))->model);
1125}
1126static DEVICE_ATTR_RO(model);
1127
1128static ssize_t rows_show(struct device *dev, struct device_attribute *attr,
1129			 char *buf)
1130{
1131	return sysfs_emit(buf, "%i\n",
1132			  ((struct raw3270 *)dev_get_drvdata(dev))->rows);
1133}
1134static DEVICE_ATTR_RO(rows);
1135
1136static ssize_t
1137columns_show(struct device *dev, struct device_attribute *attr,
1138	     char *buf)
1139{
1140	return sysfs_emit(buf, "%i\n",
1141			  ((struct raw3270 *)dev_get_drvdata(dev))->cols);
1142}
1143static DEVICE_ATTR_RO(columns);
1144
1145static struct attribute *raw3270_attrs[] = {
1146	&dev_attr_model.attr,
1147	&dev_attr_rows.attr,
1148	&dev_attr_columns.attr,
1149	NULL,
1150};
1151
1152static const struct attribute_group raw3270_attr_group = {
1153	.attrs = raw3270_attrs,
1154};
1155
1156static int raw3270_create_attributes(struct raw3270 *rp)
1157{
1158	return sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1159}
1160
1161/*
1162 * Notifier for device addition/removal
1163 */
 
 
 
 
 
1164static LIST_HEAD(raw3270_notifier);
1165
1166int raw3270_register_notifier(struct raw3270_notifier *notifier)
1167{
 
1168	struct raw3270 *rp;
1169
 
 
 
 
1170	mutex_lock(&raw3270_mutex);
1171	list_add_tail(&notifier->list, &raw3270_notifier);
1172	list_for_each_entry(rp, &raw3270_devices, list)
1173		notifier->create(rp->minor);
 
 
1174	mutex_unlock(&raw3270_mutex);
1175	return 0;
1176}
1177EXPORT_SYMBOL(raw3270_register_notifier);
1178
1179void raw3270_unregister_notifier(struct raw3270_notifier *notifier)
1180{
1181	struct raw3270 *rp;
1182
1183	mutex_lock(&raw3270_mutex);
1184	list_for_each_entry(rp, &raw3270_devices, list)
1185		notifier->destroy(rp->minor);
1186	list_del(&notifier->list);
 
 
 
1187	mutex_unlock(&raw3270_mutex);
1188}
1189EXPORT_SYMBOL(raw3270_unregister_notifier);
1190
1191/*
1192 * Set 3270 device online.
1193 */
1194static int raw3270_set_online(struct ccw_device *cdev)
 
1195{
1196	struct raw3270_notifier *np;
1197	struct raw3270 *rp;
 
1198	int rc;
1199
1200	rp = raw3270_create_device(cdev);
1201	if (IS_ERR(rp))
1202		return PTR_ERR(rp);
 
 
 
 
 
 
 
 
 
1203	rc = raw3270_create_attributes(rp);
1204	if (rc)
1205		goto failure;
1206	raw3270_reset_device(rp);
1207	mutex_lock(&raw3270_mutex);
1208	list_for_each_entry(np, &raw3270_notifier, list)
1209		np->create(rp->minor);
1210	mutex_unlock(&raw3270_mutex);
1211	return 0;
1212
1213failure:
1214	raw3270_delete_device(rp);
1215	return rc;
1216}
1217
1218/*
1219 * Remove 3270 device structure.
1220 */
1221static void raw3270_remove(struct ccw_device *cdev)
 
1222{
1223	unsigned long flags;
1224	struct raw3270 *rp;
1225	struct raw3270_view *v;
1226	struct raw3270_notifier *np;
1227
1228	rp = dev_get_drvdata(&cdev->dev);
1229	/*
1230	 * _remove is the opposite of _probe; it's probe that
1231	 * should set up rp.  raw3270_remove gets entered for
1232	 * devices even if they haven't been varied online.
1233	 * Thus, rp may validly be NULL here.
1234	 */
1235	if (!rp)
1236		return;
 
1237
1238	sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);
1239
1240	/* Deactivate current view and remove all views. */
1241	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1242	if (rp->view) {
1243		if (rp->view->fn->deactivate)
1244			rp->view->fn->deactivate(rp->view);
1245		rp->view = NULL;
1246	}
1247	while (!list_empty(&rp->view_list)) {
1248		v = list_entry(rp->view_list.next, struct raw3270_view, list);
1249		if (v->fn->release)
1250			v->fn->release(v);
1251		spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1252		raw3270_del_view(v);
1253		spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1254	}
1255	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1256
1257	mutex_lock(&raw3270_mutex);
1258	list_for_each_entry(np, &raw3270_notifier, list)
1259		np->destroy(rp->minor);
1260	mutex_unlock(&raw3270_mutex);
1261
1262	/* Reset 3270 device. */
1263	raw3270_reset_device(rp);
1264	/* And finally remove it. */
1265	raw3270_delete_device(rp);
1266}
1267
1268/*
1269 * Set 3270 device offline.
1270 */
1271static int raw3270_set_offline(struct ccw_device *cdev)
 
1272{
1273	struct raw3270 *rp;
1274
1275	rp = dev_get_drvdata(&cdev->dev);
1276	if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
1277		return -EBUSY;
1278	raw3270_remove(cdev);
1279	return 0;
1280}
1281
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1282static struct ccw_device_id raw3270_id[] = {
1283	{ CCW_DEVICE(0x3270, 0) },
1284	{ CCW_DEVICE(0x3271, 0) },
1285	{ CCW_DEVICE(0x3272, 0) },
1286	{ CCW_DEVICE(0x3273, 0) },
1287	{ CCW_DEVICE(0x3274, 0) },
1288	{ CCW_DEVICE(0x3275, 0) },
1289	{ CCW_DEVICE(0x3276, 0) },
1290	{ CCW_DEVICE(0x3277, 0) },
1291	{ CCW_DEVICE(0x3278, 0) },
1292	{ CCW_DEVICE(0x3279, 0) },
1293	{ CCW_DEVICE(0x3174, 0) },
1294	{ /* end of list */ },
1295};
1296
1297static struct ccw_driver raw3270_ccw_driver = {
1298	.driver = {
1299		.name	= "3270",
1300		.owner	= THIS_MODULE,
1301	},
1302	.ids		= raw3270_id,
1303	.probe		= &raw3270_probe,
1304	.remove		= &raw3270_remove,
1305	.set_online	= &raw3270_set_online,
1306	.set_offline	= &raw3270_set_offline,
1307	.int_class	= IRQIO_C70,
 
 
1308};
1309
1310static int raw3270_init(void)
 
1311{
1312	struct raw3270 *rp;
1313	int rc;
1314
1315	if (raw3270_registered)
1316		return 0;
1317	raw3270_registered = 1;
1318	rc = ccw_driver_register(&raw3270_ccw_driver);
1319	if (rc == 0) {
1320		/* Create attributes for early (= console) device. */
1321		mutex_lock(&raw3270_mutex);
1322		class3270 = class_create("3270");
1323		list_for_each_entry(rp, &raw3270_devices, list) {
1324			get_device(&rp->cdev->dev);
1325			raw3270_create_attributes(rp);
1326		}
1327		mutex_unlock(&raw3270_mutex);
1328	}
1329	return rc;
1330}
1331
1332static void raw3270_exit(void)
 
1333{
1334	ccw_driver_unregister(&raw3270_ccw_driver);
1335	class_destroy(class3270);
1336}
1337
1338MODULE_LICENSE("GPL");
1339
1340module_init(raw3270_init);
1341module_exit(raw3270_exit);
v3.1
 
   1/*
   2 * IBM/3270 Driver - core functions.
   3 *
   4 * Author(s):
   5 *   Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
   6 *   Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
   7 *     Copyright IBM Corp. 2003, 2009
   8 */
   9
  10#include <linux/kernel_stat.h>
  11#include <linux/module.h>
  12#include <linux/err.h>
  13#include <linux/init.h>
  14#include <linux/interrupt.h>
  15#include <linux/list.h>
  16#include <linux/slab.h>
  17#include <linux/types.h>
  18#include <linux/wait.h>
  19
  20#include <asm/ccwdev.h>
  21#include <asm/cio.h>
  22#include <asm/ebcdic.h>
  23#include <asm/diag.h>
  24
  25#include "raw3270.h"
  26
  27#include <linux/major.h>
  28#include <linux/kdev_t.h>
  29#include <linux/device.h>
  30#include <linux/mutex.h>
  31
  32static struct class *class3270;
 
  33
  34/* The main 3270 data structure. */
  35struct raw3270 {
  36	struct list_head list;
  37	struct ccw_device *cdev;
  38	int minor;
  39
  40	short model, rows, cols;
 
 
  41	unsigned long flags;
  42
  43	struct list_head req_queue;	/* Request queue. */
  44	struct list_head view_list;	/* List of available views. */
  45	struct raw3270_view *view;	/* Active view. */
  46
  47	struct timer_list timer;	/* Device timer. */
  48
  49	unsigned char *ascebc;		/* ascii -> ebcdic table */
  50	struct device *clttydev;	/* 3270-class tty device ptr */
  51	struct device *cltubdev;	/* 3270-class tub device ptr */
  52
  53	struct raw3270_request init_request;
 
 
 
  54	unsigned char init_data[256];
 
  55};
  56
 
 
 
 
 
 
 
  57/* raw3270->flags */
  58#define RAW3270_FLAGS_14BITADDR	0	/* 14-bit buffer addresses */
  59#define RAW3270_FLAGS_BUSY	1	/* Device busy, leave it alone */
  60#define RAW3270_FLAGS_ATTN	2	/* Device sent an ATTN interrupt */
  61#define RAW3270_FLAGS_READY	4	/* Device is useable by views */
  62#define RAW3270_FLAGS_CONSOLE	8	/* Device is the console. */
  63#define RAW3270_FLAGS_FROZEN	16	/* set if 3270 is frozen for suspend */
  64
  65/* Semaphore to protect global data of raw3270 (devices, views, etc). */
  66static DEFINE_MUTEX(raw3270_mutex);
  67
  68/* List of 3270 devices. */
  69static LIST_HEAD(raw3270_devices);
  70
  71/*
  72 * Flag to indicate if the driver has been registered. Some operations
  73 * like waiting for the end of i/o need to be done differently as long
  74 * as the kernel is still starting up (console support).
  75 */
  76static int raw3270_registered;
  77
  78/* Module parameters */
  79static int tubxcorrect = 0;
  80module_param(tubxcorrect, bool, 0);
  81
  82/*
  83 * Wait queue for device init/delete, view delete.
  84 */
  85DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);
 
 
 
  86
  87/*
  88 * Encode array for 12 bit 3270 addresses.
  89 */
  90static unsigned char raw3270_ebcgraf[64] =	{
  91	0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
  92	0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
  93	0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
  94	0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
  95	0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
  96	0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
  97	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
  98	0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f
  99};
 100
 101void
 102raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr)
 103{
 
 
 
 
 
 
 
 
 
 
 
 
 104	if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) {
 105		cp[0] = (addr >> 8) & 0x3f;
 106		cp[1] = addr & 0xff;
 107	} else {
 108		cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f];
 109		cp[1] = raw3270_ebcgraf[addr & 0x3f];
 110	}
 111}
 
 112
 113/*
 114 * Allocate a new 3270 ccw request
 115 */
 116struct raw3270_request *
 117raw3270_request_alloc(size_t size)
 118{
 119	struct raw3270_request *rq;
 120
 121	/* Allocate request structure */
 122	rq = kzalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA);
 123	if (!rq)
 124		return ERR_PTR(-ENOMEM);
 125
 126	/* alloc output buffer. */
 127	if (size > 0) {
 128		rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA);
 129		if (!rq->buffer) {
 130			kfree(rq);
 131			return ERR_PTR(-ENOMEM);
 132		}
 133	}
 134	rq->size = size;
 135	INIT_LIST_HEAD(&rq->list);
 136
 137	/*
 138	 * Setup ccw.
 139	 */
 140	rq->ccw.cda = __pa(rq->buffer);
 141	rq->ccw.flags = CCW_FLAG_SLI;
 142
 143	return rq;
 144}
 
 145
 146/*
 147 * Free 3270 ccw request
 148 */
 149void
 150raw3270_request_free (struct raw3270_request *rq)
 151{
 152	kfree(rq->buffer);
 153	kfree(rq);
 154}
 
 155
 156/*
 157 * Reset request to initial state.
 158 */
 159void
 160raw3270_request_reset(struct raw3270_request *rq)
 161{
 162	BUG_ON(!list_empty(&rq->list));
 
 163	rq->ccw.cmd_code = 0;
 164	rq->ccw.count = 0;
 165	rq->ccw.cda = __pa(rq->buffer);
 166	rq->ccw.flags = CCW_FLAG_SLI;
 167	rq->rescnt = 0;
 168	rq->rc = 0;
 
 169}
 
 170
 171/*
 172 * Set command code to ccw of a request.
 173 */
 174void
 175raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd)
 176{
 177	rq->ccw.cmd_code = cmd;
 178}
 
 179
 180/*
 181 * Add data fragment to output buffer.
 182 */
 183int
 184raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size)
 185{
 186	if (size + rq->ccw.count > rq->size)
 187		return -E2BIG;
 188	memcpy(rq->buffer + rq->ccw.count, data, size);
 189	rq->ccw.count += size;
 190	return 0;
 191}
 
 192
 193/*
 194 * Set address/length pair to ccw of a request.
 195 */
 196void
 197raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size)
 198{
 199	rq->ccw.cda = __pa(data);
 200	rq->ccw.count = size;
 201}
 
 202
 203/*
 204 * Set idal buffer to ccw of a request.
 205 */
 206void
 207raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib)
 208{
 209	rq->ccw.cda = __pa(ib->data);
 210	rq->ccw.count = ib->size;
 211	rq->ccw.flags |= CCW_FLAG_IDA;
 212}
 213
 214/*
 215 * Stop running ccw.
 216 */
 217static int
 218raw3270_halt_io_nolock(struct raw3270 *rp, struct raw3270_request *rq)
 219{
 220	int retries;
 221	int rc;
 222
 223	if (raw3270_request_final(rq))
 224		return 0;
 225	/* Check if interrupt has already been processed */
 226	for (retries = 0; retries < 5; retries++) {
 227		if (retries < 2)
 228			rc = ccw_device_halt(rp->cdev, (long) rq);
 229		else
 230			rc = ccw_device_clear(rp->cdev, (long) rq);
 231		if (rc == 0)
 232			break;		/* termination successful */
 233	}
 234	return rc;
 235}
 236
 237static int
 238raw3270_halt_io(struct raw3270 *rp, struct raw3270_request *rq)
 239{
 240	unsigned long flags;
 241	int rc;
 242
 243	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 244	rc = raw3270_halt_io_nolock(rp, rq);
 245	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 246	return rc;
 247}
 248
 249/*
 250 * Add the request to the request queue, try to start it if the
 251 * 3270 device is idle. Return without waiting for end of i/o.
 252 */
 253static int
 254__raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
 255		struct raw3270_request *rq)
 256{
 257	rq->view = view;
 258	raw3270_get_view(view);
 259	if (list_empty(&rp->req_queue) &&
 260	    !test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
 261		/* No other requests are on the queue. Start this one. */
 262		rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
 263					       (unsigned long) rq, 0, 0);
 264		if (rq->rc) {
 265			raw3270_put_view(view);
 266			return rq->rc;
 267		}
 268	}
 269	list_add_tail(&rq->list, &rp->req_queue);
 270	return 0;
 271}
 272
 273int
 274raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
 
 
 
 
 
 
 275{
 276	unsigned long flags;
 277	struct raw3270 *rp;
 278	int rc;
 279
 280	spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
 281	rp = view->dev;
 282	if (!rp || rp->view != view ||
 283	    test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
 284		rc = -EACCES;
 285	else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
 286		rc = -ENODEV;
 287	else
 288		rc =  __raw3270_start(rp, view, rq);
 289	spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
 290	return rc;
 291}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 292
 293int
 294raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
 295{
 296	struct raw3270 *rp;
 297	int rc;
 298
 299	rp = view->dev;
 300	if (!rp || rp->view != view ||
 301	    test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
 302		rc = -EACCES;
 303	else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
 304		rc = -ENODEV;
 305	else
 306		rc =  __raw3270_start(rp, view, rq);
 307	return rc;
 308}
 
 309
 310int
 311raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
 312{
 313	struct raw3270 *rp;
 314
 315	rp = view->dev;
 316	rq->view = view;
 317	raw3270_get_view(view);
 318	list_add_tail(&rq->list, &rp->req_queue);
 319	return 0;
 320}
 
 321
 322/*
 323 * 3270 interrupt routine, called from the ccw_device layer
 324 */
 325static void
 326raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
 327{
 328	struct raw3270 *rp;
 329	struct raw3270_view *view;
 330	struct raw3270_request *rq;
 331	int rc;
 332
 333	kstat_cpu(smp_processor_id()).irqs[IOINT_C70]++;
 334	rp = dev_get_drvdata(&cdev->dev);
 335	if (!rp)
 336		return;
 337	rq = (struct raw3270_request *) intparm;
 338	view = rq ? rq->view : rp->view;
 339
 340	if (IS_ERR(irb))
 341		rc = RAW3270_IO_RETRY;
 342	else if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
 343		rq->rc = -EIO;
 344		rc = RAW3270_IO_DONE;
 345	} else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END |
 346					   DEV_STAT_UNIT_EXCEP)) {
 347		/* Handle CE-DE-UE and subsequent UDE */
 348		set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
 349		rc = RAW3270_IO_BUSY;
 350	} else if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
 351		/* Wait for UDE if busy flag is set. */
 352		if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
 353			clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
 354			/* Got it, now retry. */
 355			rc = RAW3270_IO_RETRY;
 356		} else
 357			rc = RAW3270_IO_BUSY;
 358	} else if (view)
 359		rc = view->fn->intv(view, rq, irb);
 360	else
 361		rc = RAW3270_IO_DONE;
 
 
 
 
 
 
 
 362
 363	switch (rc) {
 364	case RAW3270_IO_DONE:
 365		break;
 366	case RAW3270_IO_BUSY:
 367		/* 
 368		 * Intervention required by the operator. We have to wait
 369		 * for unsolicited device end.
 370		 */
 371		return;
 372	case RAW3270_IO_RETRY:
 373		if (!rq)
 374			break;
 375		rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
 376					  (unsigned long) rq, 0, 0);
 377		if (rq->rc == 0)
 378			return;	/* Successfully restarted. */
 379		break;
 380	case RAW3270_IO_STOP:
 381		if (!rq)
 382			break;
 383		raw3270_halt_io_nolock(rp, rq);
 384		rq->rc = -EIO;
 385		break;
 386	default:
 387		BUG();
 388	}
 389	if (rq) {
 390		BUG_ON(list_empty(&rq->list));
 391		/* The request completed, remove from queue and do callback. */
 392		list_del_init(&rq->list);
 393		if (rq->callback)
 394			rq->callback(rq, rq->callback_data);
 395		/* Do put_device for get_device in raw3270_start. */
 396		raw3270_put_view(view);
 397	}
 
 398	/*
 399	 * Try to start each request on request queue until one is
 400	 * started successful.
 401	 */
 402	while (!list_empty(&rp->req_queue)) {
 403		rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
 404		rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
 405					  (unsigned long) rq, 0, 0);
 406		if (rq->rc == 0)
 407			break;
 408		/* Start failed. Remove request and do callback. */
 409		list_del_init(&rq->list);
 410		if (rq->callback)
 411			rq->callback(rq, rq->callback_data);
 412		/* Do put_device for get_device in raw3270_start. */
 413		raw3270_put_view(view);
 414	}
 415}
 416
 417/*
 418 * Size sensing.
 
 
 
 
 
 
 419 */
 420
 421struct raw3270_ua {	/* Query Reply structure for Usable Area */
 422	struct {	/* Usable Area Query Reply Base */
 423		short l;	/* Length of this structured field */
 424		char  sfid;	/* 0x81 if Query Reply */
 425		char  qcode;	/* 0x81 if Usable Area */
 426		char  flags0;
 427		char  flags1;
 428		short w;	/* Width of usable area */
 429		short h;	/* Heigth of usavle area */
 430		char  units;	/* 0x00:in; 0x01:mm */
 431		int   xr;
 432		int   yr;
 433		char  aw;
 434		char  ah;
 435		short buffsz;	/* Character buffer size, bytes */
 436		char  xmin;
 437		char  ymin;
 438		char  xmax;
 439		char  ymax;
 440	} __attribute__ ((packed)) uab;
 441	struct {	/* Alternate Usable Area Self-Defining Parameter */
 442		char  l;	/* Length of this Self-Defining Parm */
 443		char  sdpid;	/* 0x02 if Alternate Usable Area */
 444		char  res;
 445		char  auaid;	/* 0x01 is Id for the A U A */
 446		short wauai;	/* Width of AUAi */
 447		short hauai;	/* Height of AUAi */
 448		char  auaunits;	/* 0x00:in, 0x01:mm */
 449		int   auaxr;
 450		int   auayr;
 451		char  awauai;
 452		char  ahauai;
 453	} __attribute__ ((packed)) aua;
 454} __attribute__ ((packed));
 455
 456static struct diag210 raw3270_init_diag210;
 457static DEFINE_MUTEX(raw3270_init_mutex);
 458
 459static int
 460raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
 461		 struct irb *irb)
 462{
 463	/*
 464	 * Unit-Check Processing:
 465	 * Expect Command Reject or Intervention Required.
 466	 */
 467	if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 468		/* Request finished abnormally. */
 469		if (irb->ecw[0] & SNS0_INTERVENTION_REQ) {
 470			set_bit(RAW3270_FLAGS_BUSY, &view->dev->flags);
 471			return RAW3270_IO_BUSY;
 472		}
 473	}
 474	if (rq) {
 475		if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 476			if (irb->ecw[0] & SNS0_CMD_REJECT)
 477				rq->rc = -EOPNOTSUPP;
 478			else
 479				rq->rc = -EIO;
 480		} else
 481			/* Request finished normally. Copy residual count. */
 482			rq->rescnt = irb->scsw.cmd.count;
 483	}
 484	if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
 485		set_bit(RAW3270_FLAGS_ATTN, &view->dev->flags);
 486		wake_up(&raw3270_wait_queue);
 487	}
 488	return RAW3270_IO_DONE;
 489}
 490
 491static struct raw3270_fn raw3270_init_fn = {
 492	.intv = raw3270_init_irq
 493};
 494
 495static struct raw3270_view raw3270_init_view = {
 496	.fn = &raw3270_init_fn
 497};
 498
 499/*
 500 * raw3270_wait/raw3270_wait_interruptible/__raw3270_wakeup
 501 * Wait for end of request. The request must have been started
 502 * with raw3270_start, rc = 0. The device lock may NOT have been
 503 * released between calling raw3270_start and raw3270_wait.
 504 */
 505static void
 506raw3270_wake_init(struct raw3270_request *rq, void *data)
 507{
 508	wake_up((wait_queue_head_t *) data);
 509}
 510
 511/*
 512 * Special wait function that can cope with console initialization.
 513 */
 514static int
 515raw3270_start_init(struct raw3270 *rp, struct raw3270_view *view,
 516		   struct raw3270_request *rq)
 517{
 518	unsigned long flags;
 519	int rc;
 520
 521#ifdef CONFIG_TN3270_CONSOLE
 522	if (raw3270_registered == 0) {
 523		spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
 524		rq->callback = NULL;
 525		rc = __raw3270_start(rp, view, rq);
 526		if (rc == 0)
 527			while (!raw3270_request_final(rq)) {
 528				wait_cons_dev();
 529				barrier();
 530			}
 531		spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
 532		return rq->rc;
 533	}
 534#endif
 535	rq->callback = raw3270_wake_init;
 536	rq->callback_data = &raw3270_wait_queue;
 537	spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
 538	rc = __raw3270_start(rp, view, rq);
 539	spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
 540	if (rc)
 541		return rc;
 542	/* Now wait for the completion. */
 543	rc = wait_event_interruptible(raw3270_wait_queue,
 544				      raw3270_request_final(rq));
 545	if (rc == -ERESTARTSYS) {	/* Interrupted by a signal. */
 546		raw3270_halt_io(view->dev, rq);
 547		/* No wait for the halt to complete. */
 548		wait_event(raw3270_wait_queue, raw3270_request_final(rq));
 549		return -ERESTARTSYS;
 550	}
 551	return rq->rc;
 552}
 553
 554static int
 555__raw3270_size_device_vm(struct raw3270 *rp)
 556{
 557	int rc, model;
 558	struct ccw_dev_id dev_id;
 
 
 559
 560	ccw_device_get_id(rp->cdev, &dev_id);
 561	raw3270_init_diag210.vrdcdvno = dev_id.devno;
 562	raw3270_init_diag210.vrdclen = sizeof(struct diag210);
 563	rc = diag210(&raw3270_init_diag210);
 564	if (rc)
 565		return rc;
 566	model = raw3270_init_diag210.vrdccrmd;
 
 
 
 
 
 
 
 
 
 
 
 567	switch (model) {
 568	case 2:
 569		rp->model = model;
 570		rp->rows = 24;
 571		rp->cols = 80;
 572		break;
 573	case 3:
 574		rp->model = model;
 575		rp->rows = 32;
 576		rp->cols = 80;
 577		break;
 578	case 4:
 579		rp->model = model;
 580		rp->rows = 43;
 581		rp->cols = 80;
 582		break;
 583	case 5:
 584		rp->model = model;
 585		rp->rows = 27;
 586		rp->cols = 132;
 587		break;
 588	default:
 589		rc = -EOPNOTSUPP;
 590		break;
 591	}
 592	return rc;
 593}
 594
 595static int
 596__raw3270_size_device(struct raw3270 *rp)
 597{
 598	static const unsigned char wbuf[] =
 599		{ 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 };
 600	struct raw3270_ua *uap;
 601	int rc;
 602
 603	/*
 604	 * To determine the size of the 3270 device we need to do:
 605	 * 1) send a 'read partition' data stream to the device
 606	 * 2) wait for the attn interrupt that precedes the query reply
 607	 * 3) do a read modified to get the query reply
 608	 * To make things worse we have to cope with intervention
 609	 * required (3270 device switched to 'stand-by') and command
 610	 * rejects (old devices that can't do 'read partition').
 611	 */
 612	memset(&rp->init_request, 0, sizeof(rp->init_request));
 613	memset(&rp->init_data, 0, 256);
 614	/* Store 'read partition' data stream to init_data */
 615	memcpy(&rp->init_data, wbuf, sizeof(wbuf));
 616	INIT_LIST_HEAD(&rp->init_request.list);
 617	rp->init_request.ccw.cmd_code = TC_WRITESF;
 618	rp->init_request.ccw.flags = CCW_FLAG_SLI;
 619	rp->init_request.ccw.count = sizeof(wbuf);
 620	rp->init_request.ccw.cda = (__u32) __pa(&rp->init_data);
 621
 622	rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
 623	if (rc)
 624		/* Check error cases: -ERESTARTSYS, -EIO and -EOPNOTSUPP */
 625		return rc;
 626
 627	/* Wait for attention interrupt. */
 628#ifdef CONFIG_TN3270_CONSOLE
 629	if (raw3270_registered == 0) {
 630		unsigned long flags;
 631
 632		spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 633		while (!test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags))
 634			wait_cons_dev();
 635		spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 636	} else
 637#endif
 638		rc = wait_event_interruptible(raw3270_wait_queue,
 639			test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags));
 640	if (rc)
 641		return rc;
 642
 643	/*
 644	 * The device accepted the 'read partition' command. Now
 645	 * set up a read ccw and issue it.
 646	 */
 647	rp->init_request.ccw.cmd_code = TC_READMOD;
 648	rp->init_request.ccw.flags = CCW_FLAG_SLI;
 649	rp->init_request.ccw.count = sizeof(rp->init_data);
 650	rp->init_request.ccw.cda = (__u32) __pa(rp->init_data);
 651	rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
 652	if (rc)
 653		return rc;
 654	/* Got a Query Reply */
 655	uap = (struct raw3270_ua *) (rp->init_data + 1);
 656	/* Paranoia check. */
 657	if (rp->init_data[0] != 0x88 || uap->uab.qcode != 0x81)
 658		return -EOPNOTSUPP;
 
 
 
 
 
 659	/* Copy rows/columns of default Usable Area */
 660	rp->rows = uap->uab.h;
 661	rp->cols = uap->uab.w;
 662	/* Check for 14 bit addressing */
 663	if ((uap->uab.flags0 & 0x0d) == 0x01)
 664		set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
 665	/* Check for Alternate Usable Area */
 666	if (uap->uab.l == sizeof(struct raw3270_ua) &&
 667	    uap->aua.sdpid == 0x02) {
 668		rp->rows = uap->aua.hauai;
 669		rp->cols = uap->aua.wauai;
 670	}
 671	return 0;
 
 
 
 
 
 
 
 
 
 672}
 673
 674static int
 675raw3270_size_device(struct raw3270 *rp)
 676{
 677	int rc;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 678
 679	mutex_lock(&raw3270_init_mutex);
 680	rp->view = &raw3270_init_view;
 681	raw3270_init_view.dev = rp;
 682	if (MACHINE_IS_VM)
 683		rc = __raw3270_size_device_vm(rp);
 684	else
 685		rc = __raw3270_size_device(rp);
 686	raw3270_init_view.dev = NULL;
 687	rp->view = NULL;
 688	mutex_unlock(&raw3270_init_mutex);
 689	if (rc == 0) {	/* Found something. */
 690		/* Try to find a model. */
 691		rp->model = 0;
 692		if (rp->rows == 24 && rp->cols == 80)
 693			rp->model = 2;
 694		if (rp->rows == 32 && rp->cols == 80)
 695			rp->model = 3;
 696		if (rp->rows == 43 && rp->cols == 80)
 697			rp->model = 4;
 698		if (rp->rows == 27 && rp->cols == 132)
 699			rp->model = 5;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 700	} else {
 701		/* Couldn't detect size. Use default model 2. */
 702		rp->model = 2;
 703		rp->rows = 24;
 704		rp->cols = 80;
 705		return 0;
 706	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 707	return rc;
 708}
 709
 710static int
 711raw3270_reset_device(struct raw3270 *rp)
 712{
 
 713	int rc;
 714
 715	mutex_lock(&raw3270_init_mutex);
 716	memset(&rp->init_request, 0, sizeof(rp->init_request));
 717	memset(&rp->init_data, 0, sizeof(rp->init_data));
 718	/* Store reset data stream to init_data/init_request */
 719	rp->init_data[0] = TW_KR;
 720	INIT_LIST_HEAD(&rp->init_request.list);
 721	rp->init_request.ccw.cmd_code = TC_EWRITEA;
 722	rp->init_request.ccw.flags = CCW_FLAG_SLI;
 723	rp->init_request.ccw.count = 1;
 724	rp->init_request.ccw.cda = (__u32) __pa(rp->init_data);
 725	rp->view = &raw3270_init_view;
 726	raw3270_init_view.dev = rp;
 727	rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
 728	raw3270_init_view.dev = NULL;
 729	rp->view = NULL;
 730	mutex_unlock(&raw3270_init_mutex);
 731	return rc;
 732}
 733
 734int
 735raw3270_reset(struct raw3270_view *view)
 736{
 737	struct raw3270 *rp;
 738	int rc;
 739
 740	rp = view->dev;
 741	if (!rp || rp->view != view ||
 742	    test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
 743		rc = -EACCES;
 744	else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
 745		rc = -ENODEV;
 746	else
 747		rc = raw3270_reset_device(view->dev);
 748	return rc;
 749}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 750
 751/*
 752 * Setup new 3270 device.
 753 */
 754static int
 755raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc)
 756{
 757	struct list_head *l;
 758	struct raw3270 *tmp;
 759	int minor;
 760
 761	memset(rp, 0, sizeof(struct raw3270));
 762	/* Copy ebcdic -> ascii translation table. */
 763	memcpy(ascebc, _ascebc, 256);
 764	if (tubxcorrect) {
 765		/* correct brackets and circumflex */
 766		ascebc['['] = 0xad;
 767		ascebc[']'] = 0xbd;
 768		ascebc['^'] = 0xb0;
 769	}
 770	rp->ascebc = ascebc;
 771
 772	/* Set defaults. */
 773	rp->rows = 24;
 774	rp->cols = 80;
 
 
 775
 776	INIT_LIST_HEAD(&rp->req_queue);
 777	INIT_LIST_HEAD(&rp->view_list);
 778
 
 
 
 
 
 779	/*
 780	 * Add device to list and find the smallest unused minor
 781	 * number for it. Note: there is no device with minor 0,
 782	 * see special case for fs3270.c:fs3270_open().
 783	 */
 784	mutex_lock(&raw3270_mutex);
 785	/* Keep the list sorted. */
 786	minor = RAW3270_FIRSTMINOR;
 787	rp->minor = -1;
 788	list_for_each(l, &raw3270_devices) {
 789		tmp = list_entry(l, struct raw3270, list);
 790		if (tmp->minor > minor) {
 791			rp->minor = minor;
 792			__list_add(&rp->list, l->prev, l);
 793			break;
 794		}
 795		minor++;
 796	}
 797	if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
 798		rp->minor = minor;
 799		list_add_tail(&rp->list, &raw3270_devices);
 800	}
 801	mutex_unlock(&raw3270_mutex);
 802	/* No free minor number? Then give up. */
 803	if (rp->minor == -1)
 804		return -EUSERS;
 805	rp->cdev = cdev;
 806	dev_set_drvdata(&cdev->dev, rp);
 807	cdev->handler = raw3270_irq;
 808	return 0;
 809}
 810
 811#ifdef CONFIG_TN3270_CONSOLE
 
 
 
 
 
 
 
 
 
 812/*
 813 * Setup 3270 device configured as console.
 814 */
 815struct raw3270 __init *raw3270_setup_console(struct ccw_device *cdev)
 816{
 
 
 817	struct raw3270 *rp;
 818	char *ascebc;
 819	int rc;
 820
 821	rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
 
 
 
 
 822	ascebc = kzalloc(256, GFP_KERNEL);
 823	rc = raw3270_setup_device(cdev, rp, ascebc);
 824	if (rc)
 825		return ERR_PTR(rc);
 826	set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
 827	rc = raw3270_reset_device(rp);
 828	if (rc)
 
 
 829		return ERR_PTR(rc);
 830	rc = raw3270_size_device(rp);
 831	if (rc)
 832		return ERR_PTR(rc);
 833	rc = raw3270_reset_device(rp);
 834	if (rc)
 835		return ERR_PTR(rc);
 836	set_bit(RAW3270_FLAGS_READY, &rp->flags);
 
 
 
 
 837	return rp;
 838}
 839
 840void
 841raw3270_wait_cons_dev(struct raw3270 *rp)
 842{
 843	unsigned long flags;
 844
 845	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 846	wait_cons_dev();
 847	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 848}
 849
 850#endif
 851
 852/*
 853 * Create a 3270 device structure.
 854 */
 855static struct raw3270 *
 856raw3270_create_device(struct ccw_device *cdev)
 857{
 858	struct raw3270 *rp;
 859	char *ascebc;
 860	int rc;
 861
 862	rp = kmalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
 863	if (!rp)
 864		return ERR_PTR(-ENOMEM);
 865	ascebc = kmalloc(256, GFP_KERNEL);
 866	if (!ascebc) {
 867		kfree(rp);
 868		return ERR_PTR(-ENOMEM);
 869	}
 870	rc = raw3270_setup_device(cdev, rp, ascebc);
 871	if (rc) {
 872		kfree(rp->ascebc);
 873		kfree(rp);
 874		rp = ERR_PTR(rc);
 875	}
 876	/* Get reference to ccw_device structure. */
 877	get_device(&cdev->dev);
 878	return rp;
 879}
 880
 881/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 882 * Activate a view.
 883 */
 884int
 885raw3270_activate_view(struct raw3270_view *view)
 886{
 887	struct raw3270 *rp;
 888	struct raw3270_view *oldview, *nv;
 889	unsigned long flags;
 890	int rc;
 891
 892	rp = view->dev;
 893	if (!rp)
 894		return -ENODEV;
 895	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 896	if (rp->view == view)
 897		rc = 0;
 898	else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
 899		rc = -ENODEV;
 900	else if (test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
 901		rc = -EACCES;
 902	else {
 903		oldview = NULL;
 904		if (rp->view) {
 905			oldview = rp->view;
 906			oldview->fn->deactivate(oldview);
 907		}
 908		rp->view = view;
 909		rc = view->fn->activate(view);
 910		if (rc) {
 911			/* Didn't work. Try to reactivate the old view. */
 912			rp->view = oldview;
 913			if (!oldview || oldview->fn->activate(oldview) != 0) {
 914				/* Didn't work as well. Try any other view. */
 915				list_for_each_entry(nv, &rp->view_list, list)
 916					if (nv != view && nv != oldview) {
 917						rp->view = nv;
 918						if (nv->fn->activate(nv) == 0)
 919							break;
 920						rp->view = NULL;
 921					}
 922			}
 923		}
 924	}
 925	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 926	return rc;
 927}
 
 928
 929/*
 930 * Deactivate current view.
 931 */
 932void
 933raw3270_deactivate_view(struct raw3270_view *view)
 934{
 935	unsigned long flags;
 936	struct raw3270 *rp;
 937
 938	rp = view->dev;
 939	if (!rp)
 940		return;
 941	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 942	if (rp->view == view) {
 943		view->fn->deactivate(view);
 944		rp->view = NULL;
 945		/* Move deactivated view to end of list. */
 946		list_del_init(&view->list);
 947		list_add_tail(&view->list, &rp->view_list);
 948		/* Try to activate another view. */
 949		if (test_bit(RAW3270_FLAGS_READY, &rp->flags) &&
 950		    !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
 951			list_for_each_entry(view, &rp->view_list, list) {
 952				rp->view = view;
 953				if (view->fn->activate(view) == 0)
 954					break;
 955				rp->view = NULL;
 956			}
 957		}
 958	}
 959	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 960}
 
 961
 962/*
 963 * Add view to device with minor "minor".
 964 */
 965int
 966raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor)
 967{
 968	unsigned long flags;
 969	struct raw3270 *rp;
 970	int rc;
 971
 972	if (minor <= 0)
 973		return -ENODEV;
 974	mutex_lock(&raw3270_mutex);
 975	rc = -ENODEV;
 976	list_for_each_entry(rp, &raw3270_devices, list) {
 977		if (rp->minor != minor)
 978			continue;
 979		spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
 980		if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
 981			atomic_set(&view->ref_count, 2);
 982			view->dev = rp;
 983			view->fn = fn;
 984			view->model = rp->model;
 985			view->rows = rp->rows;
 986			view->cols = rp->cols;
 987			view->ascebc = rp->ascebc;
 988			spin_lock_init(&view->lock);
 989			list_add(&view->list, &rp->view_list);
 990			rc = 0;
 991		}
 992		spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
 993		break;
 994	}
 995	mutex_unlock(&raw3270_mutex);
 996	return rc;
 997}
 
 998
 999/*
1000 * Find specific view of device with minor "minor".
1001 */
1002struct raw3270_view *
1003raw3270_find_view(struct raw3270_fn *fn, int minor)
1004{
1005	struct raw3270 *rp;
1006	struct raw3270_view *view, *tmp;
1007	unsigned long flags;
1008
1009	mutex_lock(&raw3270_mutex);
1010	view = ERR_PTR(-ENODEV);
1011	list_for_each_entry(rp, &raw3270_devices, list) {
1012		if (rp->minor != minor)
1013			continue;
1014		spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1015		if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
1016			view = ERR_PTR(-ENOENT);
1017			list_for_each_entry(tmp, &rp->view_list, list) {
1018				if (tmp->fn == fn) {
1019					raw3270_get_view(tmp);
1020					view = tmp;
1021					break;
1022				}
1023			}
1024		}
1025		spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1026		break;
1027	}
1028	mutex_unlock(&raw3270_mutex);
1029	return view;
1030}
 
1031
1032/*
1033 * Remove view from device and free view structure via call to view->fn->free.
1034 */
1035void
1036raw3270_del_view(struct raw3270_view *view)
1037{
1038	unsigned long flags;
1039	struct raw3270 *rp;
1040	struct raw3270_view *nv;
1041
1042	rp = view->dev;
1043	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1044	if (rp->view == view) {
1045		view->fn->deactivate(view);
1046		rp->view = NULL;
1047	}
1048	list_del_init(&view->list);
1049	if (!rp->view && test_bit(RAW3270_FLAGS_READY, &rp->flags) &&
1050	    !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
1051		/* Try to activate another view. */
1052		list_for_each_entry(nv, &rp->view_list, list) {
1053			if (nv->fn->activate(nv) == 0) {
1054				rp->view = nv;
1055				break;
1056			}
1057		}
1058	}
1059	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1060	/* Wait for reference counter to drop to zero. */
1061	atomic_dec(&view->ref_count);
1062	wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
1063	if (view->fn->free)
1064		view->fn->free(view);
1065}
 
1066
1067/*
1068 * Remove a 3270 device structure.
1069 */
1070static void
1071raw3270_delete_device(struct raw3270 *rp)
1072{
1073	struct ccw_device *cdev;
1074
1075	/* Remove from device chain. */
1076	mutex_lock(&raw3270_mutex);
1077	if (rp->clttydev && !IS_ERR(rp->clttydev))
1078		device_destroy(class3270, MKDEV(IBM_TTY3270_MAJOR, rp->minor));
1079	if (rp->cltubdev && !IS_ERR(rp->cltubdev))
1080		device_destroy(class3270, MKDEV(IBM_FS3270_MAJOR, rp->minor));
1081	list_del_init(&rp->list);
1082	mutex_unlock(&raw3270_mutex);
1083
1084	/* Disconnect from ccw_device. */
1085	cdev = rp->cdev;
1086	rp->cdev = NULL;
1087	dev_set_drvdata(&cdev->dev, NULL);
1088	cdev->handler = NULL;
1089
1090	/* Put ccw_device structure. */
1091	put_device(&cdev->dev);
1092
1093	/* Now free raw3270 structure. */
1094	kfree(rp->ascebc);
1095	kfree(rp);
1096}
1097
1098static int
1099raw3270_probe (struct ccw_device *cdev)
1100{
1101	return 0;
1102}
1103
1104/*
1105 * Additional attributes for a 3270 device
1106 */
1107static ssize_t
1108raw3270_model_show(struct device *dev, struct device_attribute *attr, char *buf)
1109{
1110	return snprintf(buf, PAGE_SIZE, "%i\n",
1111			((struct raw3270 *) dev_get_drvdata(dev))->model);
1112}
1113static DEVICE_ATTR(model, 0444, raw3270_model_show, NULL);
1114
1115static ssize_t
1116raw3270_rows_show(struct device *dev, struct device_attribute *attr, char *buf)
1117{
1118	return snprintf(buf, PAGE_SIZE, "%i\n",
1119			((struct raw3270 *) dev_get_drvdata(dev))->rows);
1120}
1121static DEVICE_ATTR(rows, 0444, raw3270_rows_show, NULL);
1122
1123static ssize_t
1124raw3270_columns_show(struct device *dev, struct device_attribute *attr, char *buf)
 
1125{
1126	return snprintf(buf, PAGE_SIZE, "%i\n",
1127			((struct raw3270 *) dev_get_drvdata(dev))->cols);
1128}
1129static DEVICE_ATTR(columns, 0444, raw3270_columns_show, NULL);
1130
1131static struct attribute * raw3270_attrs[] = {
1132	&dev_attr_model.attr,
1133	&dev_attr_rows.attr,
1134	&dev_attr_columns.attr,
1135	NULL,
1136};
1137
1138static struct attribute_group raw3270_attr_group = {
1139	.attrs = raw3270_attrs,
1140};
1141
1142static int raw3270_create_attributes(struct raw3270 *rp)
1143{
1144	int rc;
1145
1146	rc = sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
1147	if (rc)
1148		goto out;
1149
1150	rp->clttydev = device_create(class3270, &rp->cdev->dev,
1151				     MKDEV(IBM_TTY3270_MAJOR, rp->minor), NULL,
1152				     "tty%s", dev_name(&rp->cdev->dev));
1153	if (IS_ERR(rp->clttydev)) {
1154		rc = PTR_ERR(rp->clttydev);
1155		goto out_ttydev;
1156	}
1157
1158	rp->cltubdev = device_create(class3270, &rp->cdev->dev,
1159				     MKDEV(IBM_FS3270_MAJOR, rp->minor), NULL,
1160				     "tub%s", dev_name(&rp->cdev->dev));
1161	if (!IS_ERR(rp->cltubdev))
1162		goto out;
1163
1164	rc = PTR_ERR(rp->cltubdev);
1165	device_destroy(class3270, MKDEV(IBM_TTY3270_MAJOR, rp->minor));
1166
1167out_ttydev:
1168	sysfs_remove_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
1169out:
1170	return rc;
1171}
1172
1173/*
1174 * Notifier for device addition/removal
1175 */
1176struct raw3270_notifier {
1177	struct list_head list;
1178	void (*notifier)(int, int);
1179};
1180
1181static LIST_HEAD(raw3270_notifier);
1182
1183int raw3270_register_notifier(void (*notifier)(int, int))
1184{
1185	struct raw3270_notifier *np;
1186	struct raw3270 *rp;
1187
1188	np = kmalloc(sizeof(struct raw3270_notifier), GFP_KERNEL);
1189	if (!np)
1190		return -ENOMEM;
1191	np->notifier = notifier;
1192	mutex_lock(&raw3270_mutex);
1193	list_add_tail(&np->list, &raw3270_notifier);
1194	list_for_each_entry(rp, &raw3270_devices, list) {
1195		get_device(&rp->cdev->dev);
1196		notifier(rp->minor, 1);
1197	}
1198	mutex_unlock(&raw3270_mutex);
1199	return 0;
1200}
 
1201
1202void raw3270_unregister_notifier(void (*notifier)(int, int))
1203{
1204	struct raw3270_notifier *np;
1205
1206	mutex_lock(&raw3270_mutex);
1207	list_for_each_entry(np, &raw3270_notifier, list)
1208		if (np->notifier == notifier) {
1209			list_del(&np->list);
1210			kfree(np);
1211			break;
1212		}
1213	mutex_unlock(&raw3270_mutex);
1214}
 
1215
1216/*
1217 * Set 3270 device online.
1218 */
1219static int
1220raw3270_set_online (struct ccw_device *cdev)
1221{
 
1222	struct raw3270 *rp;
1223	struct raw3270_notifier *np;
1224	int rc;
1225
1226	rp = raw3270_create_device(cdev);
1227	if (IS_ERR(rp))
1228		return PTR_ERR(rp);
1229	rc = raw3270_reset_device(rp);
1230	if (rc)
1231		goto failure;
1232	rc = raw3270_size_device(rp);
1233	if (rc)
1234		goto failure;
1235	rc = raw3270_reset_device(rp);
1236	if (rc)
1237		goto failure;
1238	rc = raw3270_create_attributes(rp);
1239	if (rc)
1240		goto failure;
1241	set_bit(RAW3270_FLAGS_READY, &rp->flags);
1242	mutex_lock(&raw3270_mutex);
1243	list_for_each_entry(np, &raw3270_notifier, list)
1244		np->notifier(rp->minor, 1);
1245	mutex_unlock(&raw3270_mutex);
1246	return 0;
1247
1248failure:
1249	raw3270_delete_device(rp);
1250	return rc;
1251}
1252
1253/*
1254 * Remove 3270 device structure.
1255 */
1256static void
1257raw3270_remove (struct ccw_device *cdev)
1258{
1259	unsigned long flags;
1260	struct raw3270 *rp;
1261	struct raw3270_view *v;
1262	struct raw3270_notifier *np;
1263
1264	rp = dev_get_drvdata(&cdev->dev);
1265	/*
1266	 * _remove is the opposite of _probe; it's probe that
1267	 * should set up rp.  raw3270_remove gets entered for
1268	 * devices even if they haven't been varied online.
1269	 * Thus, rp may validly be NULL here.
1270	 */
1271	if (rp == NULL)
1272		return;
1273	clear_bit(RAW3270_FLAGS_READY, &rp->flags);
1274
1275	sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);
1276
1277	/* Deactivate current view and remove all views. */
1278	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1279	if (rp->view) {
1280		rp->view->fn->deactivate(rp->view);
 
1281		rp->view = NULL;
1282	}
1283	while (!list_empty(&rp->view_list)) {
1284		v = list_entry(rp->view_list.next, struct raw3270_view, list);
1285		if (v->fn->release)
1286			v->fn->release(v);
1287		spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1288		raw3270_del_view(v);
1289		spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1290	}
1291	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1292
1293	mutex_lock(&raw3270_mutex);
1294	list_for_each_entry(np, &raw3270_notifier, list)
1295		np->notifier(rp->minor, 0);
1296	mutex_unlock(&raw3270_mutex);
1297
1298	/* Reset 3270 device. */
1299	raw3270_reset_device(rp);
1300	/* And finally remove it. */
1301	raw3270_delete_device(rp);
1302}
1303
1304/*
1305 * Set 3270 device offline.
1306 */
1307static int
1308raw3270_set_offline (struct ccw_device *cdev)
1309{
1310	struct raw3270 *rp;
1311
1312	rp = dev_get_drvdata(&cdev->dev);
1313	if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
1314		return -EBUSY;
1315	raw3270_remove(cdev);
1316	return 0;
1317}
1318
1319static int raw3270_pm_stop(struct ccw_device *cdev)
1320{
1321	struct raw3270 *rp;
1322	struct raw3270_view *view;
1323	unsigned long flags;
1324
1325	rp = dev_get_drvdata(&cdev->dev);
1326	if (!rp)
1327		return 0;
1328	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1329	if (rp->view)
1330		rp->view->fn->deactivate(rp->view);
1331	if (!test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) {
1332		/*
1333		 * Release tty and fullscreen for all non-console
1334		 * devices.
1335		 */
1336		list_for_each_entry(view, &rp->view_list, list) {
1337			if (view->fn->release)
1338				view->fn->release(view);
1339		}
1340	}
1341	set_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
1342	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1343	return 0;
1344}
1345
1346static int raw3270_pm_start(struct ccw_device *cdev)
1347{
1348	struct raw3270 *rp;
1349	unsigned long flags;
1350
1351	rp = dev_get_drvdata(&cdev->dev);
1352	if (!rp)
1353		return 0;
1354	spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1355	clear_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
1356	if (rp->view)
1357		rp->view->fn->activate(rp->view);
1358	spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1359	return 0;
1360}
1361
1362void raw3270_pm_unfreeze(struct raw3270_view *view)
1363{
1364#ifdef CONFIG_TN3270_CONSOLE
1365	struct raw3270 *rp;
1366
1367	rp = view->dev;
1368	if (rp && test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
1369		ccw_device_force_console();
1370#endif
1371}
1372
1373static struct ccw_device_id raw3270_id[] = {
1374	{ CCW_DEVICE(0x3270, 0) },
1375	{ CCW_DEVICE(0x3271, 0) },
1376	{ CCW_DEVICE(0x3272, 0) },
1377	{ CCW_DEVICE(0x3273, 0) },
1378	{ CCW_DEVICE(0x3274, 0) },
1379	{ CCW_DEVICE(0x3275, 0) },
1380	{ CCW_DEVICE(0x3276, 0) },
1381	{ CCW_DEVICE(0x3277, 0) },
1382	{ CCW_DEVICE(0x3278, 0) },
1383	{ CCW_DEVICE(0x3279, 0) },
1384	{ CCW_DEVICE(0x3174, 0) },
1385	{ /* end of list */ },
1386};
1387
1388static struct ccw_driver raw3270_ccw_driver = {
1389	.driver = {
1390		.name	= "3270",
1391		.owner	= THIS_MODULE,
1392	},
1393	.ids		= raw3270_id,
1394	.probe		= &raw3270_probe,
1395	.remove		= &raw3270_remove,
1396	.set_online	= &raw3270_set_online,
1397	.set_offline	= &raw3270_set_offline,
1398	.freeze		= &raw3270_pm_stop,
1399	.thaw		= &raw3270_pm_start,
1400	.restore	= &raw3270_pm_start,
1401};
1402
1403static int
1404raw3270_init(void)
1405{
1406	struct raw3270 *rp;
1407	int rc;
1408
1409	if (raw3270_registered)
1410		return 0;
1411	raw3270_registered = 1;
1412	rc = ccw_driver_register(&raw3270_ccw_driver);
1413	if (rc == 0) {
1414		/* Create attributes for early (= console) device. */
1415		mutex_lock(&raw3270_mutex);
1416		class3270 = class_create(THIS_MODULE, "3270");
1417		list_for_each_entry(rp, &raw3270_devices, list) {
1418			get_device(&rp->cdev->dev);
1419			raw3270_create_attributes(rp);
1420		}
1421		mutex_unlock(&raw3270_mutex);
1422	}
1423	return rc;
1424}
1425
1426static void
1427raw3270_exit(void)
1428{
1429	ccw_driver_unregister(&raw3270_ccw_driver);
1430	class_destroy(class3270);
1431}
1432
1433MODULE_LICENSE("GPL");
1434
1435module_init(raw3270_init);
1436module_exit(raw3270_exit);
1437
1438EXPORT_SYMBOL(raw3270_request_alloc);
1439EXPORT_SYMBOL(raw3270_request_free);
1440EXPORT_SYMBOL(raw3270_request_reset);
1441EXPORT_SYMBOL(raw3270_request_set_cmd);
1442EXPORT_SYMBOL(raw3270_request_add_data);
1443EXPORT_SYMBOL(raw3270_request_set_data);
1444EXPORT_SYMBOL(raw3270_request_set_idal);
1445EXPORT_SYMBOL(raw3270_buffer_address);
1446EXPORT_SYMBOL(raw3270_add_view);
1447EXPORT_SYMBOL(raw3270_del_view);
1448EXPORT_SYMBOL(raw3270_find_view);
1449EXPORT_SYMBOL(raw3270_activate_view);
1450EXPORT_SYMBOL(raw3270_deactivate_view);
1451EXPORT_SYMBOL(raw3270_start);
1452EXPORT_SYMBOL(raw3270_start_locked);
1453EXPORT_SYMBOL(raw3270_start_irq);
1454EXPORT_SYMBOL(raw3270_reset);
1455EXPORT_SYMBOL(raw3270_register_notifier);
1456EXPORT_SYMBOL(raw3270_unregister_notifier);
1457EXPORT_SYMBOL(raw3270_wait_queue);