2 * drivers/s390/char/raw3270.c
3 * IBM/3270 Driver - core functions.
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 (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
11 #include <linux/bootmem.h>
12 #include <linux/module.h>
13 #include <linux/err.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/list.h>
17 #include <linux/slab.h>
18 #include <linux/types.h>
19 #include <linux/wait.h>
21 #include <asm/ccwdev.h>
23 #include <asm/ebcdic.h>
28 #include <linux/major.h>
29 #include <linux/kdev_t.h>
30 #include <linux/device.h>
31 #include <linux/mutex.h>
33 static struct class *class3270;
35 /* The main 3270 data structure. */
37 struct list_head list;
38 struct ccw_device *cdev;
41 short model, rows, cols;
44 struct list_head req_queue; /* Request queue. */
45 struct list_head view_list; /* List of available views. */
46 struct raw3270_view *view; /* Active view. */
48 struct timer_list timer; /* Device timer. */
50 unsigned char *ascebc; /* ascii -> ebcdic table */
51 struct device *clttydev; /* 3270-class tty device ptr */
52 struct device *cltubdev; /* 3270-class tub device ptr */
54 struct raw3270_request init_request;
55 unsigned char init_data[256];
59 #define RAW3270_FLAGS_14BITADDR 0 /* 14-bit buffer addresses */
60 #define RAW3270_FLAGS_BUSY 1 /* Device busy, leave it alone */
61 #define RAW3270_FLAGS_ATTN 2 /* Device sent an ATTN interrupt */
62 #define RAW3270_FLAGS_READY 4 /* Device is useable by views */
63 #define RAW3270_FLAGS_CONSOLE 8 /* Device is the console. */
65 /* Semaphore to protect global data of raw3270 (devices, views, etc). */
66 static DEFINE_MUTEX(raw3270_mutex);
68 /* List of 3270 devices. */
69 static LIST_HEAD(raw3270_devices);
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).
76 static int raw3270_registered;
78 /* Module parameters */
79 static int tubxcorrect = 0;
80 module_param(tubxcorrect, bool, 0);
83 * Wait queue for device init/delete, view delete.
85 DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);
88 * Encode array for 12 bit 3270 addresses.
90 static 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
102 raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr)
104 if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) {
105 cp[0] = (addr >> 8) & 0x3f;
108 cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f];
109 cp[1] = raw3270_ebcgraf[addr & 0x3f];
114 * Allocate a new 3270 ccw request
116 struct raw3270_request *
117 raw3270_request_alloc(size_t size)
119 struct raw3270_request *rq;
121 /* Allocate request structure */
122 rq = kzalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA);
124 return ERR_PTR(-ENOMEM);
126 /* alloc output buffer. */
128 rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA);
131 return ERR_PTR(-ENOMEM);
135 INIT_LIST_HEAD(&rq->list);
140 rq->ccw.cda = __pa(rq->buffer);
141 rq->ccw.flags = CCW_FLAG_SLI;
146 #ifdef CONFIG_TN3270_CONSOLE
148 * Allocate a new 3270 ccw request from bootmem. Only works very
149 * early in the boot process. Only con3270.c should be using this.
151 struct raw3270_request __init *raw3270_request_alloc_bootmem(size_t size)
153 struct raw3270_request *rq;
155 rq = alloc_bootmem_low(sizeof(struct raw3270));
157 /* alloc output buffer. */
159 rq->buffer = alloc_bootmem_low(size);
161 INIT_LIST_HEAD(&rq->list);
166 rq->ccw.cda = __pa(rq->buffer);
167 rq->ccw.flags = CCW_FLAG_SLI;
174 * Free 3270 ccw request
177 raw3270_request_free (struct raw3270_request *rq)
184 * Reset request to initial state.
187 raw3270_request_reset(struct raw3270_request *rq)
189 BUG_ON(!list_empty(&rq->list));
190 rq->ccw.cmd_code = 0;
192 rq->ccw.cda = __pa(rq->buffer);
193 rq->ccw.flags = CCW_FLAG_SLI;
199 * Set command code to ccw of a request.
202 raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd)
204 rq->ccw.cmd_code = cmd;
208 * Add data fragment to output buffer.
211 raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size)
213 if (size + rq->ccw.count > rq->size)
215 memcpy(rq->buffer + rq->ccw.count, data, size);
216 rq->ccw.count += size;
221 * Set address/length pair to ccw of a request.
224 raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size)
226 rq->ccw.cda = __pa(data);
227 rq->ccw.count = size;
231 * Set idal buffer to ccw of a request.
234 raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib)
236 rq->ccw.cda = __pa(ib->data);
237 rq->ccw.count = ib->size;
238 rq->ccw.flags |= CCW_FLAG_IDA;
245 raw3270_halt_io_nolock(struct raw3270 *rp, struct raw3270_request *rq)
250 if (raw3270_request_final(rq))
252 /* Check if interrupt has already been processed */
253 for (retries = 0; retries < 5; retries++) {
255 rc = ccw_device_halt(rp->cdev, (long) rq);
257 rc = ccw_device_clear(rp->cdev, (long) rq);
259 break; /* termination successful */
265 raw3270_halt_io(struct raw3270 *rp, struct raw3270_request *rq)
270 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
271 rc = raw3270_halt_io_nolock(rp, rq);
272 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
277 * Add the request to the request queue, try to start it if the
278 * 3270 device is idle. Return without waiting for end of i/o.
281 __raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
282 struct raw3270_request *rq)
285 raw3270_get_view(view);
286 if (list_empty(&rp->req_queue) &&
287 !test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
288 /* No other requests are on the queue. Start this one. */
289 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
290 (unsigned long) rq, 0, 0);
292 raw3270_put_view(view);
296 list_add_tail(&rq->list, &rp->req_queue);
301 raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
307 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
309 if (!rp || rp->view != view)
311 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
314 rc = __raw3270_start(rp, view, rq);
315 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
320 raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
326 if (!rp || rp->view != view)
328 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
331 rc = __raw3270_start(rp, view, rq);
336 raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
342 raw3270_get_view(view);
343 list_add_tail(&rq->list, &rp->req_queue);
348 * 3270 interrupt routine, called from the ccw_device layer
351 raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
354 struct raw3270_view *view;
355 struct raw3270_request *rq;
358 rp = (struct raw3270 *) cdev->dev.driver_data;
361 rq = (struct raw3270_request *) intparm;
362 view = rq ? rq->view : rp->view;
365 rc = RAW3270_IO_RETRY;
366 else if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
368 rc = RAW3270_IO_DONE;
369 } else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END |
370 DEV_STAT_UNIT_EXCEP)) {
371 /* Handle CE-DE-UE and subsequent UDE */
372 set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
373 rc = RAW3270_IO_BUSY;
374 } else if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
375 /* Wait for UDE if busy flag is set. */
376 if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
377 clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
378 /* Got it, now retry. */
379 rc = RAW3270_IO_RETRY;
381 rc = RAW3270_IO_BUSY;
383 rc = view->fn->intv(view, rq, irb);
385 rc = RAW3270_IO_DONE;
388 case RAW3270_IO_DONE:
390 case RAW3270_IO_BUSY:
392 * Intervention required by the operator. We have to wait
393 * for unsolicited device end.
396 case RAW3270_IO_RETRY:
399 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
400 (unsigned long) rq, 0, 0);
402 return; /* Sucessfully restarted. */
404 case RAW3270_IO_STOP:
407 raw3270_halt_io_nolock(rp, rq);
414 BUG_ON(list_empty(&rq->list));
415 /* The request completed, remove from queue and do callback. */
416 list_del_init(&rq->list);
418 rq->callback(rq, rq->callback_data);
419 /* Do put_device for get_device in raw3270_start. */
420 raw3270_put_view(view);
423 * Try to start each request on request queue until one is
424 * started successful.
426 while (!list_empty(&rp->req_queue)) {
427 rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
428 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
429 (unsigned long) rq, 0, 0);
432 /* Start failed. Remove request and do callback. */
433 list_del_init(&rq->list);
435 rq->callback(rq, rq->callback_data);
436 /* Do put_device for get_device in raw3270_start. */
437 raw3270_put_view(view);
445 struct raw3270_ua { /* Query Reply structure for Usable Area */
446 struct { /* Usable Area Query Reply Base */
447 short l; /* Length of this structured field */
448 char sfid; /* 0x81 if Query Reply */
449 char qcode; /* 0x81 if Usable Area */
452 short w; /* Width of usable area */
453 short h; /* Heigth of usavle area */
454 char units; /* 0x00:in; 0x01:mm */
459 short buffsz; /* Character buffer size, bytes */
464 } __attribute__ ((packed)) uab;
465 struct { /* Alternate Usable Area Self-Defining Parameter */
466 char l; /* Length of this Self-Defining Parm */
467 char sdpid; /* 0x02 if Alternate Usable Area */
469 char auaid; /* 0x01 is Id for the A U A */
470 short wauai; /* Width of AUAi */
471 short hauai; /* Height of AUAi */
472 char auaunits; /* 0x00:in, 0x01:mm */
477 } __attribute__ ((packed)) aua;
478 } __attribute__ ((packed));
480 static struct diag210 raw3270_init_diag210;
481 static DEFINE_MUTEX(raw3270_init_mutex);
484 raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
488 * Unit-Check Processing:
489 * Expect Command Reject or Intervention Required.
491 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
492 /* Request finished abnormally. */
493 if (irb->ecw[0] & SNS0_INTERVENTION_REQ) {
494 set_bit(RAW3270_FLAGS_BUSY, &view->dev->flags);
495 return RAW3270_IO_BUSY;
499 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
500 if (irb->ecw[0] & SNS0_CMD_REJECT)
501 rq->rc = -EOPNOTSUPP;
505 /* Request finished normally. Copy residual count. */
506 rq->rescnt = irb->scsw.cmd.count;
508 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
509 set_bit(RAW3270_FLAGS_ATTN, &view->dev->flags);
510 wake_up(&raw3270_wait_queue);
512 return RAW3270_IO_DONE;
515 static struct raw3270_fn raw3270_init_fn = {
516 .intv = raw3270_init_irq
519 static struct raw3270_view raw3270_init_view = {
520 .fn = &raw3270_init_fn
524 * raw3270_wait/raw3270_wait_interruptible/__raw3270_wakeup
525 * Wait for end of request. The request must have been started
526 * with raw3270_start, rc = 0. The device lock may NOT have been
527 * released between calling raw3270_start and raw3270_wait.
530 raw3270_wake_init(struct raw3270_request *rq, void *data)
532 wake_up((wait_queue_head_t *) data);
536 * Special wait function that can cope with console initialization.
539 raw3270_start_init(struct raw3270 *rp, struct raw3270_view *view,
540 struct raw3270_request *rq)
545 #ifdef CONFIG_TN3270_CONSOLE
546 if (raw3270_registered == 0) {
547 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
549 rc = __raw3270_start(rp, view, rq);
551 while (!raw3270_request_final(rq)) {
555 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
559 rq->callback = raw3270_wake_init;
560 rq->callback_data = &raw3270_wait_queue;
561 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
562 rc = __raw3270_start(rp, view, rq);
563 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
566 /* Now wait for the completion. */
567 rc = wait_event_interruptible(raw3270_wait_queue,
568 raw3270_request_final(rq));
569 if (rc == -ERESTARTSYS) { /* Interrupted by a signal. */
570 raw3270_halt_io(view->dev, rq);
571 /* No wait for the halt to complete. */
572 wait_event(raw3270_wait_queue, raw3270_request_final(rq));
579 __raw3270_size_device_vm(struct raw3270 *rp)
582 struct ccw_dev_id dev_id;
584 ccw_device_get_id(rp->cdev, &dev_id);
585 raw3270_init_diag210.vrdcdvno = dev_id.devno;
586 raw3270_init_diag210.vrdclen = sizeof(struct diag210);
587 rc = diag210(&raw3270_init_diag210);
590 model = raw3270_init_diag210.vrdccrmd;
620 __raw3270_size_device(struct raw3270 *rp)
622 static const unsigned char wbuf[] =
623 { 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 };
624 struct raw3270_ua *uap;
625 unsigned short count;
629 * To determine the size of the 3270 device we need to do:
630 * 1) send a 'read partition' data stream to the device
631 * 2) wait for the attn interrupt that preceeds the query reply
632 * 3) do a read modified to get the query reply
633 * To make things worse we have to cope with intervention
634 * required (3270 device switched to 'stand-by') and command
635 * rejects (old devices that can't do 'read partition').
637 memset(&rp->init_request, 0, sizeof(rp->init_request));
638 memset(&rp->init_data, 0, 256);
639 /* Store 'read partition' data stream to init_data */
640 memcpy(&rp->init_data, wbuf, sizeof(wbuf));
641 INIT_LIST_HEAD(&rp->init_request.list);
642 rp->init_request.ccw.cmd_code = TC_WRITESF;
643 rp->init_request.ccw.flags = CCW_FLAG_SLI;
644 rp->init_request.ccw.count = sizeof(wbuf);
645 rp->init_request.ccw.cda = (__u32) __pa(&rp->init_data);
647 rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
649 /* Check error cases: -ERESTARTSYS, -EIO and -EOPNOTSUPP */
652 /* Wait for attention interrupt. */
653 #ifdef CONFIG_TN3270_CONSOLE
654 if (raw3270_registered == 0) {
657 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
658 while (!test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags))
660 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
663 rc = wait_event_interruptible(raw3270_wait_queue,
664 test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags));
669 * The device accepted the 'read partition' command. Now
670 * set up a read ccw and issue it.
672 rp->init_request.ccw.cmd_code = TC_READMOD;
673 rp->init_request.ccw.flags = CCW_FLAG_SLI;
674 rp->init_request.ccw.count = sizeof(rp->init_data);
675 rp->init_request.ccw.cda = (__u32) __pa(rp->init_data);
676 rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
679 /* Got a Query Reply */
680 count = sizeof(rp->init_data) - rp->init_request.rescnt;
681 uap = (struct raw3270_ua *) (rp->init_data + 1);
682 /* Paranoia check. */
683 if (rp->init_data[0] != 0x88 || uap->uab.qcode != 0x81)
685 /* Copy rows/columns of default Usable Area */
686 rp->rows = uap->uab.h;
687 rp->cols = uap->uab.w;
688 /* Check for 14 bit addressing */
689 if ((uap->uab.flags0 & 0x0d) == 0x01)
690 set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
691 /* Check for Alternate Usable Area */
692 if (uap->uab.l == sizeof(struct raw3270_ua) &&
693 uap->aua.sdpid == 0x02) {
694 rp->rows = uap->aua.hauai;
695 rp->cols = uap->aua.wauai;
701 raw3270_size_device(struct raw3270 *rp)
705 mutex_lock(&raw3270_init_mutex);
706 rp->view = &raw3270_init_view;
707 raw3270_init_view.dev = rp;
709 rc = __raw3270_size_device_vm(rp);
711 rc = __raw3270_size_device(rp);
712 raw3270_init_view.dev = NULL;
714 mutex_unlock(&raw3270_init_mutex);
715 if (rc == 0) { /* Found something. */
716 /* Try to find a model. */
718 if (rp->rows == 24 && rp->cols == 80)
720 if (rp->rows == 32 && rp->cols == 80)
722 if (rp->rows == 43 && rp->cols == 80)
724 if (rp->rows == 27 && rp->cols == 132)
727 /* Couldn't detect size. Use default model 2. */
737 raw3270_reset_device(struct raw3270 *rp)
741 mutex_lock(&raw3270_init_mutex);
742 memset(&rp->init_request, 0, sizeof(rp->init_request));
743 memset(&rp->init_data, 0, sizeof(rp->init_data));
744 /* Store reset data stream to init_data/init_request */
745 rp->init_data[0] = TW_KR;
746 INIT_LIST_HEAD(&rp->init_request.list);
747 rp->init_request.ccw.cmd_code = TC_EWRITEA;
748 rp->init_request.ccw.flags = CCW_FLAG_SLI;
749 rp->init_request.ccw.count = 1;
750 rp->init_request.ccw.cda = (__u32) __pa(rp->init_data);
751 rp->view = &raw3270_init_view;
752 raw3270_init_view.dev = rp;
753 rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
754 raw3270_init_view.dev = NULL;
756 mutex_unlock(&raw3270_init_mutex);
761 raw3270_reset(struct raw3270_view *view)
767 if (!rp || rp->view != view)
769 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
772 rc = raw3270_reset_device(view->dev);
777 * Setup new 3270 device.
780 raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc)
786 memset(rp, 0, sizeof(struct raw3270));
787 /* Copy ebcdic -> ascii translation table. */
788 memcpy(ascebc, _ascebc, 256);
790 /* correct brackets and circumflex */
801 INIT_LIST_HEAD(&rp->req_queue);
802 INIT_LIST_HEAD(&rp->view_list);
805 * Add device to list and find the smallest unused minor
806 * number for it. Note: there is no device with minor 0,
807 * see special case for fs3270.c:fs3270_open().
809 mutex_lock(&raw3270_mutex);
810 /* Keep the list sorted. */
811 minor = RAW3270_FIRSTMINOR;
813 list_for_each(l, &raw3270_devices) {
814 tmp = list_entry(l, struct raw3270, list);
815 if (tmp->minor > minor) {
817 __list_add(&rp->list, l->prev, l);
822 if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
824 list_add_tail(&rp->list, &raw3270_devices);
826 mutex_unlock(&raw3270_mutex);
827 /* No free minor number? Then give up. */
831 cdev->dev.driver_data = rp;
832 cdev->handler = raw3270_irq;
836 #ifdef CONFIG_TN3270_CONSOLE
838 * Setup 3270 device configured as console.
840 struct raw3270 __init *raw3270_setup_console(struct ccw_device *cdev)
846 rp = (struct raw3270 *) alloc_bootmem_low(sizeof(struct raw3270));
847 ascebc = (char *) alloc_bootmem(256);
848 rc = raw3270_setup_device(cdev, rp, ascebc);
851 set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
852 rc = raw3270_reset_device(rp);
855 rc = raw3270_size_device(rp);
858 rc = raw3270_reset_device(rp);
861 set_bit(RAW3270_FLAGS_READY, &rp->flags);
866 raw3270_wait_cons_dev(struct raw3270 *rp)
870 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
872 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
878 * Create a 3270 device structure.
880 static struct raw3270 *
881 raw3270_create_device(struct ccw_device *cdev)
887 rp = kmalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
889 return ERR_PTR(-ENOMEM);
890 ascebc = kmalloc(256, GFP_KERNEL);
893 return ERR_PTR(-ENOMEM);
895 rc = raw3270_setup_device(cdev, rp, ascebc);
901 /* Get reference to ccw_device structure. */
902 get_device(&cdev->dev);
910 raw3270_activate_view(struct raw3270_view *view)
913 struct raw3270_view *oldview, *nv;
920 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
921 if (rp->view == view)
923 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
929 oldview->fn->deactivate(oldview);
932 rc = view->fn->activate(view);
934 /* Didn't work. Try to reactivate the old view. */
936 if (!oldview || oldview->fn->activate(oldview) != 0) {
937 /* Didn't work as well. Try any other view. */
938 list_for_each_entry(nv, &rp->view_list, list)
939 if (nv != view && nv != oldview) {
941 if (nv->fn->activate(nv) == 0)
948 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
953 * Deactivate current view.
956 raw3270_deactivate_view(struct raw3270_view *view)
964 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
965 if (rp->view == view) {
966 view->fn->deactivate(view);
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 (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
973 list_for_each_entry(view, &rp->view_list, list) {
975 if (view->fn->activate(view) == 0)
981 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
985 * Add view to device with minor "minor".
988 raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor)
996 mutex_lock(&raw3270_mutex);
998 list_for_each_entry(rp, &raw3270_devices, list) {
999 if (rp->minor != minor)
1001 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1002 if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
1003 atomic_set(&view->ref_count, 2);
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 list_add(&view->list, &rp->view_list);
1014 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1017 mutex_unlock(&raw3270_mutex);
1022 * Find specific view of device with minor "minor".
1024 struct raw3270_view *
1025 raw3270_find_view(struct raw3270_fn *fn, int minor)
1028 struct raw3270_view *view, *tmp;
1029 unsigned long flags;
1031 mutex_lock(&raw3270_mutex);
1032 view = ERR_PTR(-ENODEV);
1033 list_for_each_entry(rp, &raw3270_devices, list) {
1034 if (rp->minor != minor)
1036 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1037 if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
1038 view = ERR_PTR(-ENOENT);
1039 list_for_each_entry(tmp, &rp->view_list, list) {
1040 if (tmp->fn == fn) {
1041 raw3270_get_view(tmp);
1047 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1050 mutex_unlock(&raw3270_mutex);
1055 * Remove view from device and free view structure via call to view->fn->free.
1058 raw3270_del_view(struct raw3270_view *view)
1060 unsigned long flags;
1062 struct raw3270_view *nv;
1065 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1066 if (rp->view == view) {
1067 view->fn->deactivate(view);
1070 list_del_init(&view->list);
1071 if (!rp->view && test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
1072 /* Try to activate another view. */
1073 list_for_each_entry(nv, &rp->view_list, list) {
1074 if (nv->fn->activate(nv) == 0) {
1080 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1081 /* Wait for reference counter to drop to zero. */
1082 atomic_dec(&view->ref_count);
1083 wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
1085 view->fn->free(view);
1089 * Remove a 3270 device structure.
1092 raw3270_delete_device(struct raw3270 *rp)
1094 struct ccw_device *cdev;
1096 /* Remove from device chain. */
1097 mutex_lock(&raw3270_mutex);
1098 if (rp->clttydev && !IS_ERR(rp->clttydev))
1099 device_destroy(class3270, MKDEV(IBM_TTY3270_MAJOR, rp->minor));
1100 if (rp->cltubdev && !IS_ERR(rp->cltubdev))
1101 device_destroy(class3270, MKDEV(IBM_FS3270_MAJOR, rp->minor));
1102 list_del_init(&rp->list);
1103 mutex_unlock(&raw3270_mutex);
1105 /* Disconnect from ccw_device. */
1108 cdev->dev.driver_data = NULL;
1109 cdev->handler = NULL;
1111 /* Put ccw_device structure. */
1112 put_device(&cdev->dev);
1114 /* Now free raw3270 structure. */
1120 raw3270_probe (struct ccw_device *cdev)
1126 * Additional attributes for a 3270 device
1129 raw3270_model_show(struct device *dev, struct device_attribute *attr, char *buf)
1131 return snprintf(buf, PAGE_SIZE, "%i\n",
1132 ((struct raw3270 *) dev->driver_data)->model);
1134 static DEVICE_ATTR(model, 0444, raw3270_model_show, NULL);
1137 raw3270_rows_show(struct device *dev, struct device_attribute *attr, char *buf)
1139 return snprintf(buf, PAGE_SIZE, "%i\n",
1140 ((struct raw3270 *) dev->driver_data)->rows);
1142 static DEVICE_ATTR(rows, 0444, raw3270_rows_show, NULL);
1145 raw3270_columns_show(struct device *dev, struct device_attribute *attr, char *buf)
1147 return snprintf(buf, PAGE_SIZE, "%i\n",
1148 ((struct raw3270 *) dev->driver_data)->cols);
1150 static DEVICE_ATTR(columns, 0444, raw3270_columns_show, NULL);
1152 static struct attribute * raw3270_attrs[] = {
1153 &dev_attr_model.attr,
1154 &dev_attr_rows.attr,
1155 &dev_attr_columns.attr,
1159 static struct attribute_group raw3270_attr_group = {
1160 .attrs = raw3270_attrs,
1163 static int raw3270_create_attributes(struct raw3270 *rp)
1167 rc = sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
1171 rp->clttydev = device_create(class3270, &rp->cdev->dev,
1172 MKDEV(IBM_TTY3270_MAJOR, rp->minor), NULL,
1173 "tty%s", dev_name(&rp->cdev->dev));
1174 if (IS_ERR(rp->clttydev)) {
1175 rc = PTR_ERR(rp->clttydev);
1179 rp->cltubdev = device_create(class3270, &rp->cdev->dev,
1180 MKDEV(IBM_FS3270_MAJOR, rp->minor), NULL,
1181 "tub%s", dev_name(&rp->cdev->dev));
1182 if (!IS_ERR(rp->cltubdev))
1185 rc = PTR_ERR(rp->cltubdev);
1186 device_destroy(class3270, MKDEV(IBM_TTY3270_MAJOR, rp->minor));
1189 sysfs_remove_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
1195 * Notifier for device addition/removal
1197 struct raw3270_notifier {
1198 struct list_head list;
1199 void (*notifier)(int, int);
1202 static LIST_HEAD(raw3270_notifier);
1204 int raw3270_register_notifier(void (*notifier)(int, int))
1206 struct raw3270_notifier *np;
1209 np = kmalloc(sizeof(struct raw3270_notifier), GFP_KERNEL);
1212 np->notifier = notifier;
1213 mutex_lock(&raw3270_mutex);
1214 list_add_tail(&np->list, &raw3270_notifier);
1215 list_for_each_entry(rp, &raw3270_devices, list) {
1216 get_device(&rp->cdev->dev);
1217 notifier(rp->minor, 1);
1219 mutex_unlock(&raw3270_mutex);
1223 void raw3270_unregister_notifier(void (*notifier)(int, int))
1225 struct raw3270_notifier *np;
1227 mutex_lock(&raw3270_mutex);
1228 list_for_each_entry(np, &raw3270_notifier, list)
1229 if (np->notifier == notifier) {
1230 list_del(&np->list);
1234 mutex_unlock(&raw3270_mutex);
1238 * Set 3270 device online.
1241 raw3270_set_online (struct ccw_device *cdev)
1244 struct raw3270_notifier *np;
1247 rp = raw3270_create_device(cdev);
1250 rc = raw3270_reset_device(rp);
1253 rc = raw3270_size_device(rp);
1256 rc = raw3270_reset_device(rp);
1259 rc = raw3270_create_attributes(rp);
1262 set_bit(RAW3270_FLAGS_READY, &rp->flags);
1263 mutex_lock(&raw3270_mutex);
1264 list_for_each_entry(np, &raw3270_notifier, list)
1265 np->notifier(rp->minor, 1);
1266 mutex_unlock(&raw3270_mutex);
1270 raw3270_delete_device(rp);
1275 * Remove 3270 device structure.
1278 raw3270_remove (struct ccw_device *cdev)
1280 unsigned long flags;
1282 struct raw3270_view *v;
1283 struct raw3270_notifier *np;
1285 rp = cdev->dev.driver_data;
1287 * _remove is the opposite of _probe; it's probe that
1288 * should set up rp. raw3270_remove gets entered for
1289 * devices even if they haven't been varied online.
1290 * Thus, rp may validly be NULL here.
1294 clear_bit(RAW3270_FLAGS_READY, &rp->flags);
1296 sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);
1298 /* Deactivate current view and remove all views. */
1299 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1301 rp->view->fn->deactivate(rp->view);
1304 while (!list_empty(&rp->view_list)) {
1305 v = list_entry(rp->view_list.next, struct raw3270_view, list);
1308 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1309 raw3270_del_view(v);
1310 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1312 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1314 mutex_lock(&raw3270_mutex);
1315 list_for_each_entry(np, &raw3270_notifier, list)
1316 np->notifier(rp->minor, 0);
1317 mutex_unlock(&raw3270_mutex);
1319 /* Reset 3270 device. */
1320 raw3270_reset_device(rp);
1321 /* And finally remove it. */
1322 raw3270_delete_device(rp);
1326 * Set 3270 device offline.
1329 raw3270_set_offline (struct ccw_device *cdev)
1333 rp = cdev->dev.driver_data;
1334 if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
1336 raw3270_remove(cdev);
1340 static struct ccw_device_id raw3270_id[] = {
1341 { CCW_DEVICE(0x3270, 0) },
1342 { CCW_DEVICE(0x3271, 0) },
1343 { CCW_DEVICE(0x3272, 0) },
1344 { CCW_DEVICE(0x3273, 0) },
1345 { CCW_DEVICE(0x3274, 0) },
1346 { CCW_DEVICE(0x3275, 0) },
1347 { CCW_DEVICE(0x3276, 0) },
1348 { CCW_DEVICE(0x3277, 0) },
1349 { CCW_DEVICE(0x3278, 0) },
1350 { CCW_DEVICE(0x3279, 0) },
1351 { CCW_DEVICE(0x3174, 0) },
1352 { /* end of list */ },
1355 static struct ccw_driver raw3270_ccw_driver = {
1357 .owner = THIS_MODULE,
1359 .probe = &raw3270_probe,
1360 .remove = &raw3270_remove,
1361 .set_online = &raw3270_set_online,
1362 .set_offline = &raw3270_set_offline,
1371 if (raw3270_registered)
1373 raw3270_registered = 1;
1374 rc = ccw_driver_register(&raw3270_ccw_driver);
1376 /* Create attributes for early (= console) device. */
1377 mutex_lock(&raw3270_mutex);
1378 class3270 = class_create(THIS_MODULE, "3270");
1379 list_for_each_entry(rp, &raw3270_devices, list) {
1380 get_device(&rp->cdev->dev);
1381 raw3270_create_attributes(rp);
1383 mutex_unlock(&raw3270_mutex);
1391 ccw_driver_unregister(&raw3270_ccw_driver);
1392 class_destroy(class3270);
1395 MODULE_LICENSE("GPL");
1397 module_init(raw3270_init);
1398 module_exit(raw3270_exit);
1400 EXPORT_SYMBOL(raw3270_request_alloc);
1401 EXPORT_SYMBOL(raw3270_request_free);
1402 EXPORT_SYMBOL(raw3270_request_reset);
1403 EXPORT_SYMBOL(raw3270_request_set_cmd);
1404 EXPORT_SYMBOL(raw3270_request_add_data);
1405 EXPORT_SYMBOL(raw3270_request_set_data);
1406 EXPORT_SYMBOL(raw3270_request_set_idal);
1407 EXPORT_SYMBOL(raw3270_buffer_address);
1408 EXPORT_SYMBOL(raw3270_add_view);
1409 EXPORT_SYMBOL(raw3270_del_view);
1410 EXPORT_SYMBOL(raw3270_find_view);
1411 EXPORT_SYMBOL(raw3270_activate_view);
1412 EXPORT_SYMBOL(raw3270_deactivate_view);
1413 EXPORT_SYMBOL(raw3270_start);
1414 EXPORT_SYMBOL(raw3270_start_locked);
1415 EXPORT_SYMBOL(raw3270_start_irq);
1416 EXPORT_SYMBOL(raw3270_reset);
1417 EXPORT_SYMBOL(raw3270_register_notifier);
1418 EXPORT_SYMBOL(raw3270_unregister_notifier);
1419 EXPORT_SYMBOL(raw3270_wait_queue);