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/config.h>
12 #include <linux/bootmem.h>
13 #include <linux/module.h>
14 #include <linux/err.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/types.h>
20 #include <linux/wait.h>
22 #include <asm/ccwdev.h>
24 #include <asm/ebcdic.h>
28 #include <linux/major.h>
29 #include <linux/kdev_t.h>
30 #include <linux/device.h>
32 struct class *class3270;
34 /* The main 3270 data structure. */
36 struct list_head list;
37 struct ccw_device *cdev;
40 short model, rows, cols;
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. */
47 struct timer_list timer; /* Device timer. */
49 unsigned char *ascebc; /* ascii -> ebcdic table */
50 struct class_device *clttydev; /* 3270-class tty device ptr */
51 struct class_device *cltubdev; /* 3270-class tub device ptr */
55 #define RAW3270_FLAGS_14BITADDR 0 /* 14-bit buffer addresses */
56 #define RAW3270_FLAGS_BUSY 1 /* Device busy, leave it alone */
57 #define RAW3270_FLAGS_ATTN 2 /* Device sent an ATTN interrupt */
58 #define RAW3270_FLAGS_READY 4 /* Device is useable by views */
59 #define RAW3270_FLAGS_CONSOLE 8 /* Device is the console. */
61 /* Semaphore to protect global data of raw3270 (devices, views, etc). */
62 static DECLARE_MUTEX(raw3270_sem);
64 /* List of 3270 devices. */
65 static struct list_head raw3270_devices = LIST_HEAD_INIT(raw3270_devices);
68 * Flag to indicate if the driver has been registered. Some operations
69 * like waiting for the end of i/o need to be done differently as long
70 * as the kernel is still starting up (console support).
72 static int raw3270_registered;
74 /* Module parameters */
75 static int tubxcorrect = 0;
76 module_param(tubxcorrect, bool, 0);
79 * Wait queue for device init/delete, view delete.
81 DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);
84 * Encode array for 12 bit 3270 addresses.
86 unsigned char raw3270_ebcgraf[64] = {
87 0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
88 0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
89 0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
90 0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
91 0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
92 0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
93 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
94 0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f
98 raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr)
100 if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) {
101 cp[0] = (addr >> 8) & 0x3f;
104 cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f];
105 cp[1] = raw3270_ebcgraf[addr & 0x3f];
110 * Allocate a new 3270 ccw request
112 struct raw3270_request *
113 raw3270_request_alloc(size_t size)
115 struct raw3270_request *rq;
117 /* Allocate request structure */
118 rq = kzalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA);
120 return ERR_PTR(-ENOMEM);
122 /* alloc output buffer. */
124 rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA);
127 return ERR_PTR(-ENOMEM);
131 INIT_LIST_HEAD(&rq->list);
136 rq->ccw.cda = __pa(rq->buffer);
137 rq->ccw.flags = CCW_FLAG_SLI;
142 #ifdef CONFIG_TN3270_CONSOLE
144 * Allocate a new 3270 ccw request from bootmem. Only works very
145 * early in the boot process. Only con3270.c should be using this.
147 struct raw3270_request *
148 raw3270_request_alloc_bootmem(size_t size)
150 struct raw3270_request *rq;
152 rq = alloc_bootmem_low(sizeof(struct raw3270));
154 return ERR_PTR(-ENOMEM);
155 memset(rq, 0, sizeof(struct raw3270_request));
157 /* alloc output buffer. */
159 rq->buffer = alloc_bootmem_low(size);
161 free_bootmem((unsigned long) rq,
162 sizeof(struct raw3270));
163 return ERR_PTR(-ENOMEM);
167 INIT_LIST_HEAD(&rq->list);
172 rq->ccw.cda = __pa(rq->buffer);
173 rq->ccw.flags = CCW_FLAG_SLI;
180 * Free 3270 ccw request
183 raw3270_request_free (struct raw3270_request *rq)
190 * Reset request to initial state.
193 raw3270_request_reset(struct raw3270_request *rq)
195 BUG_ON(!list_empty(&rq->list));
196 rq->ccw.cmd_code = 0;
198 rq->ccw.cda = __pa(rq->buffer);
199 rq->ccw.flags = CCW_FLAG_SLI;
205 * Set command code to ccw of a request.
208 raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd)
210 rq->ccw.cmd_code = cmd;
214 * Add data fragment to output buffer.
217 raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size)
219 if (size + rq->ccw.count > rq->size)
221 memcpy(rq->buffer + rq->ccw.count, data, size);
222 rq->ccw.count += size;
227 * Set address/length pair to ccw of a request.
230 raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size)
232 rq->ccw.cda = __pa(data);
233 rq->ccw.count = size;
237 * Set idal buffer to ccw of a request.
240 raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib)
242 rq->ccw.cda = __pa(ib->data);
243 rq->ccw.count = ib->size;
244 rq->ccw.flags |= CCW_FLAG_IDA;
251 raw3270_halt_io_nolock(struct raw3270 *rp, struct raw3270_request *rq)
256 if (raw3270_request_final(rq))
258 /* Check if interrupt has already been processed */
259 for (retries = 0; retries < 5; retries++) {
261 rc = ccw_device_halt(rp->cdev, (long) rq);
263 rc = ccw_device_clear(rp->cdev, (long) rq);
265 break; /* termination successful */
271 raw3270_halt_io(struct raw3270 *rp, struct raw3270_request *rq)
276 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
277 rc = raw3270_halt_io_nolock(rp, rq);
278 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
283 * Add the request to the request queue, try to start it if the
284 * 3270 device is idle. Return without waiting for end of i/o.
287 __raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
288 struct raw3270_request *rq)
291 raw3270_get_view(view);
292 if (list_empty(&rp->req_queue) &&
293 !test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
294 /* No other requests are on the queue. Start this one. */
295 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
296 (unsigned long) rq, 0, 0);
298 raw3270_put_view(view);
302 list_add_tail(&rq->list, &rp->req_queue);
307 raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
313 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
315 if (!rp || rp->view != view)
317 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
320 rc = __raw3270_start(rp, view, rq);
321 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
326 raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
332 if (!rp || rp->view != view)
334 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
337 rc = __raw3270_start(rp, view, rq);
342 raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
348 raw3270_get_view(view);
349 list_add_tail(&rq->list, &rp->req_queue);
354 * 3270 interrupt routine, called from the ccw_device layer
357 raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
360 struct raw3270_view *view;
361 struct raw3270_request *rq;
364 rp = (struct raw3270 *) cdev->dev.driver_data;
367 rq = (struct raw3270_request *) intparm;
368 view = rq ? rq->view : rp->view;
371 rc = RAW3270_IO_RETRY;
372 else if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) {
374 rc = RAW3270_IO_DONE;
375 } else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END |
376 DEV_STAT_UNIT_EXCEP)) {
377 /* Handle CE-DE-UE and subsequent UDE */
378 set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
379 rc = RAW3270_IO_BUSY;
380 } else if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
381 /* Wait for UDE if busy flag is set. */
382 if (irb->scsw.dstat & DEV_STAT_DEV_END) {
383 clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
384 /* Got it, now retry. */
385 rc = RAW3270_IO_RETRY;
387 rc = RAW3270_IO_BUSY;
389 rc = view->fn->intv(view, rq, irb);
391 rc = RAW3270_IO_DONE;
394 case RAW3270_IO_DONE:
396 case RAW3270_IO_BUSY:
398 * Intervention required by the operator. We have to wait
399 * for unsolicited device end.
402 case RAW3270_IO_RETRY:
405 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
406 (unsigned long) rq, 0, 0);
408 return; /* Sucessfully restarted. */
410 case RAW3270_IO_STOP:
413 raw3270_halt_io_nolock(rp, rq);
420 BUG_ON(list_empty(&rq->list));
421 /* The request completed, remove from queue and do callback. */
422 list_del_init(&rq->list);
424 rq->callback(rq, rq->callback_data);
425 /* Do put_device for get_device in raw3270_start. */
426 raw3270_put_view(view);
429 * Try to start each request on request queue until one is
430 * started successful.
432 while (!list_empty(&rp->req_queue)) {
433 rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
434 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
435 (unsigned long) rq, 0, 0);
438 /* Start failed. Remove request and do callback. */
439 list_del_init(&rq->list);
441 rq->callback(rq, rq->callback_data);
442 /* Do put_device for get_device in raw3270_start. */
443 raw3270_put_view(view);
451 struct raw3270_ua { /* Query Reply structure for Usable Area */
452 struct { /* Usable Area Query Reply Base */
453 short l; /* Length of this structured field */
454 char sfid; /* 0x81 if Query Reply */
455 char qcode; /* 0x81 if Usable Area */
458 short w; /* Width of usable area */
459 short h; /* Heigth of usavle area */
460 char units; /* 0x00:in; 0x01:mm */
465 short buffsz; /* Character buffer size, bytes */
470 } __attribute__ ((packed)) uab;
471 struct { /* Alternate Usable Area Self-Defining Parameter */
472 char l; /* Length of this Self-Defining Parm */
473 char sdpid; /* 0x02 if Alternate Usable Area */
475 char auaid; /* 0x01 is Id for the A U A */
476 short wauai; /* Width of AUAi */
477 short hauai; /* Height of AUAi */
478 char auaunits; /* 0x00:in, 0x01:mm */
483 } __attribute__ ((packed)) aua;
484 } __attribute__ ((packed));
486 static unsigned char raw3270_init_data[256];
487 static struct raw3270_request raw3270_init_request;
488 static struct diag210 raw3270_init_diag210;
489 static DECLARE_MUTEX(raw3270_init_sem);
492 raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
496 * Unit-Check Processing:
497 * Expect Command Reject or Intervention Required.
499 if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK) {
500 /* Request finished abnormally. */
501 if (irb->ecw[0] & SNS0_INTERVENTION_REQ) {
502 set_bit(RAW3270_FLAGS_BUSY, &view->dev->flags);
503 return RAW3270_IO_BUSY;
507 if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK) {
508 if (irb->ecw[0] & SNS0_CMD_REJECT)
509 rq->rc = -EOPNOTSUPP;
513 /* Request finished normally. Copy residual count. */
514 rq->rescnt = irb->scsw.count;
516 if (irb->scsw.dstat & DEV_STAT_ATTENTION) {
517 set_bit(RAW3270_FLAGS_ATTN, &view->dev->flags);
518 wake_up(&raw3270_wait_queue);
520 return RAW3270_IO_DONE;
523 static struct raw3270_fn raw3270_init_fn = {
524 .intv = raw3270_init_irq
527 static struct raw3270_view raw3270_init_view = {
528 .fn = &raw3270_init_fn
532 * raw3270_wait/raw3270_wait_interruptible/__raw3270_wakeup
533 * Wait for end of request. The request must have been started
534 * with raw3270_start, rc = 0. The device lock may NOT have been
535 * released between calling raw3270_start and raw3270_wait.
538 raw3270_wake_init(struct raw3270_request *rq, void *data)
540 wake_up((wait_queue_head_t *) data);
544 * Special wait function that can cope with console initialization.
547 raw3270_start_init(struct raw3270 *rp, struct raw3270_view *view,
548 struct raw3270_request *rq)
551 wait_queue_head_t wq;
554 #ifdef CONFIG_TN3270_CONSOLE
555 if (raw3270_registered == 0) {
556 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
558 rc = __raw3270_start(rp, view, rq);
560 while (!raw3270_request_final(rq)) {
564 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
568 init_waitqueue_head(&wq);
569 rq->callback = raw3270_wake_init;
570 rq->callback_data = &wq;
571 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
572 rc = __raw3270_start(rp, view, rq);
573 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
576 /* Now wait for the completion. */
577 rc = wait_event_interruptible(wq, raw3270_request_final(rq));
578 if (rc == -ERESTARTSYS) { /* Interrupted by a signal. */
579 raw3270_halt_io(view->dev, rq);
580 /* No wait for the halt to complete. */
581 wait_event(wq, raw3270_request_final(rq));
588 __raw3270_size_device_vm(struct raw3270 *rp)
592 raw3270_init_diag210.vrdcdvno =
593 _ccw_device_get_device_number(rp->cdev);
594 raw3270_init_diag210.vrdclen = sizeof(struct diag210);
595 rc = diag210(&raw3270_init_diag210);
598 model = raw3270_init_diag210.vrdccrmd;
621 printk(KERN_WARNING "vrdccrmd is 0x%.8x\n", model);
629 __raw3270_size_device(struct raw3270 *rp)
631 static const unsigned char wbuf[] =
632 { 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 };
633 struct raw3270_ua *uap;
634 unsigned short count;
638 * To determine the size of the 3270 device we need to do:
639 * 1) send a 'read partition' data stream to the device
640 * 2) wait for the attn interrupt that preceeds the query reply
641 * 3) do a read modified to get the query reply
642 * To make things worse we have to cope with intervention
643 * required (3270 device switched to 'stand-by') and command
644 * rejects (old devices that can't do 'read partition').
646 memset(&raw3270_init_request, 0, sizeof(raw3270_init_request));
647 memset(raw3270_init_data, 0, sizeof(raw3270_init_data));
648 /* Store 'read partition' data stream to raw3270_init_data */
649 memcpy(raw3270_init_data, wbuf, sizeof(wbuf));
650 INIT_LIST_HEAD(&raw3270_init_request.list);
651 raw3270_init_request.ccw.cmd_code = TC_WRITESF;
652 raw3270_init_request.ccw.flags = CCW_FLAG_SLI;
653 raw3270_init_request.ccw.count = sizeof(wbuf);
654 raw3270_init_request.ccw.cda = (__u32) __pa(raw3270_init_data);
656 rc = raw3270_start_init(rp, &raw3270_init_view, &raw3270_init_request);
658 /* Check error cases: -ERESTARTSYS, -EIO and -EOPNOTSUPP */
661 /* Wait for attention interrupt. */
662 #ifdef CONFIG_TN3270_CONSOLE
663 if (raw3270_registered == 0) {
666 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
667 while (!test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags))
669 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
672 rc = wait_event_interruptible(raw3270_wait_queue,
673 test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags));
678 * The device accepted the 'read partition' command. Now
679 * set up a read ccw and issue it.
681 raw3270_init_request.ccw.cmd_code = TC_READMOD;
682 raw3270_init_request.ccw.flags = CCW_FLAG_SLI;
683 raw3270_init_request.ccw.count = sizeof(raw3270_init_data);
684 raw3270_init_request.ccw.cda = (__u32) __pa(raw3270_init_data);
685 rc = raw3270_start_init(rp, &raw3270_init_view, &raw3270_init_request);
688 /* Got a Query Reply */
689 count = sizeof(raw3270_init_data) - raw3270_init_request.rescnt;
690 uap = (struct raw3270_ua *) (raw3270_init_data + 1);
691 /* Paranoia check. */
692 if (raw3270_init_data[0] != 0x88 || uap->uab.qcode != 0x81)
694 /* Copy rows/columns of default Usable Area */
695 rp->rows = uap->uab.h;
696 rp->cols = uap->uab.w;
697 /* Check for 14 bit addressing */
698 if ((uap->uab.flags0 & 0x0d) == 0x01)
699 set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
700 /* Check for Alternate Usable Area */
701 if (uap->uab.l == sizeof(struct raw3270_ua) &&
702 uap->aua.sdpid == 0x02) {
703 rp->rows = uap->aua.hauai;
704 rp->cols = uap->aua.wauai;
710 raw3270_size_device(struct raw3270 *rp)
714 down(&raw3270_init_sem);
715 rp->view = &raw3270_init_view;
716 raw3270_init_view.dev = rp;
718 rc = __raw3270_size_device_vm(rp);
720 rc = __raw3270_size_device(rp);
721 raw3270_init_view.dev = 0;
723 up(&raw3270_init_sem);
724 if (rc == 0) { /* Found something. */
725 /* Try to find a model. */
727 if (rp->rows == 24 && rp->cols == 80)
729 if (rp->rows == 32 && rp->cols == 80)
731 if (rp->rows == 43 && rp->cols == 80)
733 if (rp->rows == 27 && rp->cols == 132)
736 /* Couldn't detect size. Use default model 2. */
746 raw3270_reset_device(struct raw3270 *rp)
750 down(&raw3270_init_sem);
751 memset(&raw3270_init_request, 0, sizeof(raw3270_init_request));
752 memset(raw3270_init_data, 0, sizeof(raw3270_init_data));
753 /* Store reset data stream to raw3270_init_data/raw3270_init_request */
754 raw3270_init_data[0] = TW_KR;
755 INIT_LIST_HEAD(&raw3270_init_request.list);
756 raw3270_init_request.ccw.cmd_code = TC_EWRITEA;
757 raw3270_init_request.ccw.flags = CCW_FLAG_SLI;
758 raw3270_init_request.ccw.count = 1;
759 raw3270_init_request.ccw.cda = (__u32) __pa(raw3270_init_data);
760 rp->view = &raw3270_init_view;
761 raw3270_init_view.dev = rp;
762 rc = raw3270_start_init(rp, &raw3270_init_view, &raw3270_init_request);
763 raw3270_init_view.dev = 0;
765 up(&raw3270_init_sem);
770 raw3270_reset(struct raw3270_view *view)
776 if (!rp || rp->view != view)
778 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
781 rc = raw3270_reset_device(view->dev);
786 * Setup new 3270 device.
789 raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc)
795 memset(rp, 0, sizeof(struct raw3270));
796 /* Copy ebcdic -> ascii translation table. */
797 memcpy(ascebc, _ascebc, 256);
799 /* correct brackets and circumflex */
810 INIT_LIST_HEAD(&rp->req_queue);
811 INIT_LIST_HEAD(&rp->view_list);
814 * Add device to list and find the smallest unused minor
815 * number for it. Note: there is no device with minor 0,
816 * see special case for fs3270.c:fs3270_open().
819 /* Keep the list sorted. */
820 minor = RAW3270_FIRSTMINOR;
822 list_for_each(l, &raw3270_devices) {
823 tmp = list_entry(l, struct raw3270, list);
824 if (tmp->minor > minor) {
826 __list_add(&rp->list, l->prev, l);
831 if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
833 list_add_tail(&rp->list, &raw3270_devices);
836 /* No free minor number? Then give up. */
840 cdev->dev.driver_data = rp;
841 cdev->handler = raw3270_irq;
845 #ifdef CONFIG_TN3270_CONSOLE
847 * Setup 3270 device configured as console.
850 raw3270_setup_console(struct ccw_device *cdev)
856 rp = (struct raw3270 *) alloc_bootmem(sizeof(struct raw3270));
857 ascebc = (char *) alloc_bootmem(256);
858 rc = raw3270_setup_device(cdev, rp, ascebc);
861 set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
862 rc = raw3270_reset_device(rp);
865 rc = raw3270_size_device(rp);
868 rc = raw3270_reset_device(rp);
871 set_bit(RAW3270_FLAGS_READY, &rp->flags);
876 raw3270_wait_cons_dev(struct raw3270 *rp)
880 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
882 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
888 * Create a 3270 device structure.
890 static struct raw3270 *
891 raw3270_create_device(struct ccw_device *cdev)
897 rp = kmalloc(sizeof(struct raw3270), GFP_KERNEL);
899 return ERR_PTR(-ENOMEM);
900 ascebc = kmalloc(256, GFP_KERNEL);
903 return ERR_PTR(-ENOMEM);
905 rc = raw3270_setup_device(cdev, rp, ascebc);
911 /* Get reference to ccw_device structure. */
912 get_device(&cdev->dev);
920 raw3270_activate_view(struct raw3270_view *view)
923 struct raw3270_view *oldview, *nv;
930 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
931 if (rp->view == view)
933 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
939 oldview->fn->deactivate(oldview);
942 rc = view->fn->activate(view);
944 /* Didn't work. Try to reactivate the old view. */
946 if (!oldview || oldview->fn->activate(oldview) != 0) {
947 /* Didn't work as well. Try any other view. */
948 list_for_each_entry(nv, &rp->view_list, list)
949 if (nv != view && nv != oldview) {
951 if (nv->fn->activate(nv) == 0)
958 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
963 * Deactivate current view.
966 raw3270_deactivate_view(struct raw3270_view *view)
974 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
975 if (rp->view == view) {
976 view->fn->deactivate(view);
978 /* Move deactivated view to end of list. */
979 list_del_init(&view->list);
980 list_add_tail(&view->list, &rp->view_list);
981 /* Try to activate another view. */
982 if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
983 list_for_each_entry(view, &rp->view_list, list) {
985 if (view->fn->activate(view) == 0)
991 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
995 * Add view to device with minor "minor".
998 raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor)
1000 unsigned long flags;
1008 list_for_each_entry(rp, &raw3270_devices, list) {
1009 if (rp->minor != minor)
1011 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1012 if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
1013 atomic_set(&view->ref_count, 2);
1016 view->model = rp->model;
1017 view->rows = rp->rows;
1018 view->cols = rp->cols;
1019 view->ascebc = rp->ascebc;
1020 spin_lock_init(&view->lock);
1021 list_add(&view->list, &rp->view_list);
1024 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1032 * Find specific view of device with minor "minor".
1034 struct raw3270_view *
1035 raw3270_find_view(struct raw3270_fn *fn, int minor)
1038 struct raw3270_view *view, *tmp;
1039 unsigned long flags;
1042 view = ERR_PTR(-ENODEV);
1043 list_for_each_entry(rp, &raw3270_devices, list) {
1044 if (rp->minor != minor)
1046 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1047 if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
1048 view = ERR_PTR(-ENOENT);
1049 list_for_each_entry(tmp, &rp->view_list, list) {
1050 if (tmp->fn == fn) {
1051 raw3270_get_view(tmp);
1057 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1065 * Remove view from device and free view structure via call to view->fn->free.
1068 raw3270_del_view(struct raw3270_view *view)
1070 unsigned long flags;
1072 struct raw3270_view *nv;
1075 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1076 if (rp->view == view) {
1077 view->fn->deactivate(view);
1080 list_del_init(&view->list);
1081 if (!rp->view && test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
1082 /* Try to activate another view. */
1083 list_for_each_entry(nv, &rp->view_list, list) {
1084 if (nv->fn->activate(nv) == 0) {
1090 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1091 /* Wait for reference counter to drop to zero. */
1092 atomic_dec(&view->ref_count);
1093 wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
1095 view->fn->free(view);
1099 * Remove a 3270 device structure.
1102 raw3270_delete_device(struct raw3270 *rp)
1104 struct ccw_device *cdev;
1106 /* Remove from device chain. */
1109 class_device_destroy(class3270,
1110 MKDEV(IBM_TTY3270_MAJOR, rp->minor));
1112 class_device_destroy(class3270,
1113 MKDEV(IBM_FS3270_MAJOR, rp->minor));
1114 list_del_init(&rp->list);
1117 /* Disconnect from ccw_device. */
1120 cdev->dev.driver_data = 0;
1123 /* Put ccw_device structure. */
1124 put_device(&cdev->dev);
1126 /* Now free raw3270 structure. */
1132 raw3270_probe (struct ccw_device *cdev)
1138 * Additional attributes for a 3270 device
1141 raw3270_model_show(struct device *dev, struct device_attribute *attr, char *buf)
1143 return snprintf(buf, PAGE_SIZE, "%i\n",
1144 ((struct raw3270 *) dev->driver_data)->model);
1146 static DEVICE_ATTR(model, 0444, raw3270_model_show, 0);
1149 raw3270_rows_show(struct device *dev, struct device_attribute *attr, char *buf)
1151 return snprintf(buf, PAGE_SIZE, "%i\n",
1152 ((struct raw3270 *) dev->driver_data)->rows);
1154 static DEVICE_ATTR(rows, 0444, raw3270_rows_show, 0);
1157 raw3270_columns_show(struct device *dev, struct device_attribute *attr, char *buf)
1159 return snprintf(buf, PAGE_SIZE, "%i\n",
1160 ((struct raw3270 *) dev->driver_data)->cols);
1162 static DEVICE_ATTR(columns, 0444, raw3270_columns_show, 0);
1164 static struct attribute * raw3270_attrs[] = {
1165 &dev_attr_model.attr,
1166 &dev_attr_rows.attr,
1167 &dev_attr_columns.attr,
1171 static struct attribute_group raw3270_attr_group = {
1172 .attrs = raw3270_attrs,
1176 raw3270_create_attributes(struct raw3270 *rp)
1178 //FIXME: check return code
1179 sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
1181 class_device_create(class3270, NULL,
1182 MKDEV(IBM_TTY3270_MAJOR, rp->minor),
1183 &rp->cdev->dev, "tty%s",
1184 rp->cdev->dev.bus_id);
1186 class_device_create(class3270, NULL,
1187 MKDEV(IBM_FS3270_MAJOR, rp->minor),
1188 &rp->cdev->dev, "tub%s",
1189 rp->cdev->dev.bus_id);
1193 * Notifier for device addition/removal
1195 struct raw3270_notifier {
1196 struct list_head list;
1197 void (*notifier)(int, int);
1200 static struct list_head raw3270_notifier = LIST_HEAD_INIT(raw3270_notifier);
1202 int raw3270_register_notifier(void (*notifier)(int, int))
1204 struct raw3270_notifier *np;
1207 np = kmalloc(sizeof(struct raw3270_notifier), GFP_KERNEL);
1210 np->notifier = notifier;
1212 list_add_tail(&np->list, &raw3270_notifier);
1213 list_for_each_entry(rp, &raw3270_devices, list) {
1214 get_device(&rp->cdev->dev);
1215 notifier(rp->minor, 1);
1221 void raw3270_unregister_notifier(void (*notifier)(int, int))
1223 struct raw3270_notifier *np;
1226 list_for_each_entry(np, &raw3270_notifier, list)
1227 if (np->notifier == notifier) {
1228 list_del(&np->list);
1236 * Set 3270 device online.
1239 raw3270_set_online (struct ccw_device *cdev)
1242 struct raw3270_notifier *np;
1245 rp = raw3270_create_device(cdev);
1248 rc = raw3270_reset_device(rp);
1251 rc = raw3270_size_device(rp);
1254 rc = raw3270_reset_device(rp);
1257 raw3270_create_attributes(rp);
1258 set_bit(RAW3270_FLAGS_READY, &rp->flags);
1260 list_for_each_entry(np, &raw3270_notifier, list)
1261 np->notifier(rp->minor, 1);
1266 raw3270_delete_device(rp);
1271 * Remove 3270 device structure.
1274 raw3270_remove (struct ccw_device *cdev)
1276 unsigned long flags;
1278 struct raw3270_view *v;
1279 struct raw3270_notifier *np;
1281 rp = cdev->dev.driver_data;
1283 * _remove is the opposite of _probe; it's probe that
1284 * should set up rp. raw3270_remove gets entered for
1285 * devices even if they haven't been varied online.
1286 * Thus, rp may validly be NULL here.
1290 clear_bit(RAW3270_FLAGS_READY, &rp->flags);
1292 sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);
1294 /* Deactivate current view and remove all views. */
1295 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1297 rp->view->fn->deactivate(rp->view);
1300 while (!list_empty(&rp->view_list)) {
1301 v = list_entry(rp->view_list.next, struct raw3270_view, list);
1304 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1305 raw3270_del_view(v);
1306 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1308 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1311 list_for_each_entry(np, &raw3270_notifier, list)
1312 np->notifier(rp->minor, 0);
1315 /* Reset 3270 device. */
1316 raw3270_reset_device(rp);
1317 /* And finally remove it. */
1318 raw3270_delete_device(rp);
1322 * Set 3270 device offline.
1325 raw3270_set_offline (struct ccw_device *cdev)
1329 rp = cdev->dev.driver_data;
1330 if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
1332 raw3270_remove(cdev);
1336 static struct ccw_device_id raw3270_id[] = {
1337 { CCW_DEVICE(0x3270, 0) },
1338 { CCW_DEVICE(0x3271, 0) },
1339 { CCW_DEVICE(0x3272, 0) },
1340 { CCW_DEVICE(0x3273, 0) },
1341 { CCW_DEVICE(0x3274, 0) },
1342 { CCW_DEVICE(0x3275, 0) },
1343 { CCW_DEVICE(0x3276, 0) },
1344 { CCW_DEVICE(0x3277, 0) },
1345 { CCW_DEVICE(0x3278, 0) },
1346 { CCW_DEVICE(0x3279, 0) },
1347 { CCW_DEVICE(0x3174, 0) },
1348 { /* end of list */ },
1351 static struct ccw_driver raw3270_ccw_driver = {
1353 .owner = THIS_MODULE,
1355 .probe = &raw3270_probe,
1356 .remove = &raw3270_remove,
1357 .set_online = &raw3270_set_online,
1358 .set_offline = &raw3270_set_offline,
1367 if (raw3270_registered)
1369 raw3270_registered = 1;
1370 rc = ccw_driver_register(&raw3270_ccw_driver);
1372 /* Create attributes for early (= console) device. */
1374 class3270 = class_create(THIS_MODULE, "3270");
1375 list_for_each_entry(rp, &raw3270_devices, list) {
1376 get_device(&rp->cdev->dev);
1377 raw3270_create_attributes(rp);
1387 ccw_driver_unregister(&raw3270_ccw_driver);
1388 class_destroy(class3270);
1391 MODULE_LICENSE("GPL");
1393 module_init(raw3270_init);
1394 module_exit(raw3270_exit);
1396 EXPORT_SYMBOL(raw3270_request_alloc);
1397 EXPORT_SYMBOL(raw3270_request_free);
1398 EXPORT_SYMBOL(raw3270_request_reset);
1399 EXPORT_SYMBOL(raw3270_request_set_cmd);
1400 EXPORT_SYMBOL(raw3270_request_add_data);
1401 EXPORT_SYMBOL(raw3270_request_set_data);
1402 EXPORT_SYMBOL(raw3270_request_set_idal);
1403 EXPORT_SYMBOL(raw3270_buffer_address);
1404 EXPORT_SYMBOL(raw3270_add_view);
1405 EXPORT_SYMBOL(raw3270_del_view);
1406 EXPORT_SYMBOL(raw3270_find_view);
1407 EXPORT_SYMBOL(raw3270_activate_view);
1408 EXPORT_SYMBOL(raw3270_deactivate_view);
1409 EXPORT_SYMBOL(raw3270_start);
1410 EXPORT_SYMBOL(raw3270_start_locked);
1411 EXPORT_SYMBOL(raw3270_start_irq);
1412 EXPORT_SYMBOL(raw3270_reset);
1413 EXPORT_SYMBOL(raw3270_register_notifier);
1414 EXPORT_SYMBOL(raw3270_unregister_notifier);
1415 EXPORT_SYMBOL(raw3270_wait_queue);