2 * IBM/3270 Driver - core functions.
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
10 #include <linux/bootmem.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>
20 #include <asm/ccwdev.h>
22 #include <asm/ebcdic.h>
27 #include <linux/major.h>
28 #include <linux/kdev_t.h>
29 #include <linux/device.h>
30 #include <linux/mutex.h>
32 static 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 device *clttydev; /* 3270-class tty device ptr */
51 struct device *cltubdev; /* 3270-class tub device ptr */
53 struct raw3270_request init_request;
54 unsigned char init_data[256];
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 */
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 ||
310 test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
312 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
315 rc = __raw3270_start(rp, view, rq);
316 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
321 raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
327 if (!rp || rp->view != view ||
328 test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
330 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
333 rc = __raw3270_start(rp, view, rq);
338 raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
344 raw3270_get_view(view);
345 list_add_tail(&rq->list, &rp->req_queue);
350 * 3270 interrupt routine, called from the ccw_device layer
353 raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
356 struct raw3270_view *view;
357 struct raw3270_request *rq;
360 rp = dev_get_drvdata(&cdev->dev);
363 rq = (struct raw3270_request *) intparm;
364 view = rq ? rq->view : rp->view;
367 rc = RAW3270_IO_RETRY;
368 else if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
370 rc = RAW3270_IO_DONE;
371 } else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END |
372 DEV_STAT_UNIT_EXCEP)) {
373 /* Handle CE-DE-UE and subsequent UDE */
374 set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
375 rc = RAW3270_IO_BUSY;
376 } else if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
377 /* Wait for UDE if busy flag is set. */
378 if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
379 clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
380 /* Got it, now retry. */
381 rc = RAW3270_IO_RETRY;
383 rc = RAW3270_IO_BUSY;
385 rc = view->fn->intv(view, rq, irb);
387 rc = RAW3270_IO_DONE;
390 case RAW3270_IO_DONE:
392 case RAW3270_IO_BUSY:
394 * Intervention required by the operator. We have to wait
395 * for unsolicited device end.
398 case RAW3270_IO_RETRY:
401 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
402 (unsigned long) rq, 0, 0);
404 return; /* Sucessfully restarted. */
406 case RAW3270_IO_STOP:
409 raw3270_halt_io_nolock(rp, rq);
416 BUG_ON(list_empty(&rq->list));
417 /* The request completed, remove from queue and do callback. */
418 list_del_init(&rq->list);
420 rq->callback(rq, rq->callback_data);
421 /* Do put_device for get_device in raw3270_start. */
422 raw3270_put_view(view);
425 * Try to start each request on request queue until one is
426 * started successful.
428 while (!list_empty(&rp->req_queue)) {
429 rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
430 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
431 (unsigned long) rq, 0, 0);
434 /* Start failed. Remove request and do callback. */
435 list_del_init(&rq->list);
437 rq->callback(rq, rq->callback_data);
438 /* Do put_device for get_device in raw3270_start. */
439 raw3270_put_view(view);
447 struct raw3270_ua { /* Query Reply structure for Usable Area */
448 struct { /* Usable Area Query Reply Base */
449 short l; /* Length of this structured field */
450 char sfid; /* 0x81 if Query Reply */
451 char qcode; /* 0x81 if Usable Area */
454 short w; /* Width of usable area */
455 short h; /* Heigth of usavle area */
456 char units; /* 0x00:in; 0x01:mm */
461 short buffsz; /* Character buffer size, bytes */
466 } __attribute__ ((packed)) uab;
467 struct { /* Alternate Usable Area Self-Defining Parameter */
468 char l; /* Length of this Self-Defining Parm */
469 char sdpid; /* 0x02 if Alternate Usable Area */
471 char auaid; /* 0x01 is Id for the A U A */
472 short wauai; /* Width of AUAi */
473 short hauai; /* Height of AUAi */
474 char auaunits; /* 0x00:in, 0x01:mm */
479 } __attribute__ ((packed)) aua;
480 } __attribute__ ((packed));
482 static struct diag210 raw3270_init_diag210;
483 static DEFINE_MUTEX(raw3270_init_mutex);
486 raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
490 * Unit-Check Processing:
491 * Expect Command Reject or Intervention Required.
493 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
494 /* Request finished abnormally. */
495 if (irb->ecw[0] & SNS0_INTERVENTION_REQ) {
496 set_bit(RAW3270_FLAGS_BUSY, &view->dev->flags);
497 return RAW3270_IO_BUSY;
501 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
502 if (irb->ecw[0] & SNS0_CMD_REJECT)
503 rq->rc = -EOPNOTSUPP;
507 /* Request finished normally. Copy residual count. */
508 rq->rescnt = irb->scsw.cmd.count;
510 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
511 set_bit(RAW3270_FLAGS_ATTN, &view->dev->flags);
512 wake_up(&raw3270_wait_queue);
514 return RAW3270_IO_DONE;
517 static struct raw3270_fn raw3270_init_fn = {
518 .intv = raw3270_init_irq
521 static struct raw3270_view raw3270_init_view = {
522 .fn = &raw3270_init_fn
526 * raw3270_wait/raw3270_wait_interruptible/__raw3270_wakeup
527 * Wait for end of request. The request must have been started
528 * with raw3270_start, rc = 0. The device lock may NOT have been
529 * released between calling raw3270_start and raw3270_wait.
532 raw3270_wake_init(struct raw3270_request *rq, void *data)
534 wake_up((wait_queue_head_t *) data);
538 * Special wait function that can cope with console initialization.
541 raw3270_start_init(struct raw3270 *rp, struct raw3270_view *view,
542 struct raw3270_request *rq)
547 #ifdef CONFIG_TN3270_CONSOLE
548 if (raw3270_registered == 0) {
549 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
551 rc = __raw3270_start(rp, view, rq);
553 while (!raw3270_request_final(rq)) {
557 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
561 rq->callback = raw3270_wake_init;
562 rq->callback_data = &raw3270_wait_queue;
563 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
564 rc = __raw3270_start(rp, view, rq);
565 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
568 /* Now wait for the completion. */
569 rc = wait_event_interruptible(raw3270_wait_queue,
570 raw3270_request_final(rq));
571 if (rc == -ERESTARTSYS) { /* Interrupted by a signal. */
572 raw3270_halt_io(view->dev, rq);
573 /* No wait for the halt to complete. */
574 wait_event(raw3270_wait_queue, raw3270_request_final(rq));
581 __raw3270_size_device_vm(struct raw3270 *rp)
584 struct ccw_dev_id dev_id;
586 ccw_device_get_id(rp->cdev, &dev_id);
587 raw3270_init_diag210.vrdcdvno = dev_id.devno;
588 raw3270_init_diag210.vrdclen = sizeof(struct diag210);
589 rc = diag210(&raw3270_init_diag210);
592 model = raw3270_init_diag210.vrdccrmd;
622 __raw3270_size_device(struct raw3270 *rp)
624 static const unsigned char wbuf[] =
625 { 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 };
626 struct raw3270_ua *uap;
627 unsigned short count;
631 * To determine the size of the 3270 device we need to do:
632 * 1) send a 'read partition' data stream to the device
633 * 2) wait for the attn interrupt that preceeds the query reply
634 * 3) do a read modified to get the query reply
635 * To make things worse we have to cope with intervention
636 * required (3270 device switched to 'stand-by') and command
637 * rejects (old devices that can't do 'read partition').
639 memset(&rp->init_request, 0, sizeof(rp->init_request));
640 memset(&rp->init_data, 0, 256);
641 /* Store 'read partition' data stream to init_data */
642 memcpy(&rp->init_data, wbuf, sizeof(wbuf));
643 INIT_LIST_HEAD(&rp->init_request.list);
644 rp->init_request.ccw.cmd_code = TC_WRITESF;
645 rp->init_request.ccw.flags = CCW_FLAG_SLI;
646 rp->init_request.ccw.count = sizeof(wbuf);
647 rp->init_request.ccw.cda = (__u32) __pa(&rp->init_data);
649 rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
651 /* Check error cases: -ERESTARTSYS, -EIO and -EOPNOTSUPP */
654 /* Wait for attention interrupt. */
655 #ifdef CONFIG_TN3270_CONSOLE
656 if (raw3270_registered == 0) {
659 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
660 while (!test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags))
662 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
665 rc = wait_event_interruptible(raw3270_wait_queue,
666 test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags));
671 * The device accepted the 'read partition' command. Now
672 * set up a read ccw and issue it.
674 rp->init_request.ccw.cmd_code = TC_READMOD;
675 rp->init_request.ccw.flags = CCW_FLAG_SLI;
676 rp->init_request.ccw.count = sizeof(rp->init_data);
677 rp->init_request.ccw.cda = (__u32) __pa(rp->init_data);
678 rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
681 /* Got a Query Reply */
682 count = sizeof(rp->init_data) - rp->init_request.rescnt;
683 uap = (struct raw3270_ua *) (rp->init_data + 1);
684 /* Paranoia check. */
685 if (rp->init_data[0] != 0x88 || uap->uab.qcode != 0x81)
687 /* Copy rows/columns of default Usable Area */
688 rp->rows = uap->uab.h;
689 rp->cols = uap->uab.w;
690 /* Check for 14 bit addressing */
691 if ((uap->uab.flags0 & 0x0d) == 0x01)
692 set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
693 /* Check for Alternate Usable Area */
694 if (uap->uab.l == sizeof(struct raw3270_ua) &&
695 uap->aua.sdpid == 0x02) {
696 rp->rows = uap->aua.hauai;
697 rp->cols = uap->aua.wauai;
703 raw3270_size_device(struct raw3270 *rp)
707 mutex_lock(&raw3270_init_mutex);
708 rp->view = &raw3270_init_view;
709 raw3270_init_view.dev = rp;
711 rc = __raw3270_size_device_vm(rp);
713 rc = __raw3270_size_device(rp);
714 raw3270_init_view.dev = NULL;
716 mutex_unlock(&raw3270_init_mutex);
717 if (rc == 0) { /* Found something. */
718 /* Try to find a model. */
720 if (rp->rows == 24 && rp->cols == 80)
722 if (rp->rows == 32 && rp->cols == 80)
724 if (rp->rows == 43 && rp->cols == 80)
726 if (rp->rows == 27 && rp->cols == 132)
729 /* Couldn't detect size. Use default model 2. */
739 raw3270_reset_device(struct raw3270 *rp)
743 mutex_lock(&raw3270_init_mutex);
744 memset(&rp->init_request, 0, sizeof(rp->init_request));
745 memset(&rp->init_data, 0, sizeof(rp->init_data));
746 /* Store reset data stream to init_data/init_request */
747 rp->init_data[0] = TW_KR;
748 INIT_LIST_HEAD(&rp->init_request.list);
749 rp->init_request.ccw.cmd_code = TC_EWRITEA;
750 rp->init_request.ccw.flags = CCW_FLAG_SLI;
751 rp->init_request.ccw.count = 1;
752 rp->init_request.ccw.cda = (__u32) __pa(rp->init_data);
753 rp->view = &raw3270_init_view;
754 raw3270_init_view.dev = rp;
755 rc = raw3270_start_init(rp, &raw3270_init_view, &rp->init_request);
756 raw3270_init_view.dev = NULL;
758 mutex_unlock(&raw3270_init_mutex);
763 raw3270_reset(struct raw3270_view *view)
769 if (!rp || rp->view != view ||
770 test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
772 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
775 rc = raw3270_reset_device(view->dev);
780 * Setup new 3270 device.
783 raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc)
789 memset(rp, 0, sizeof(struct raw3270));
790 /* Copy ebcdic -> ascii translation table. */
791 memcpy(ascebc, _ascebc, 256);
793 /* correct brackets and circumflex */
804 INIT_LIST_HEAD(&rp->req_queue);
805 INIT_LIST_HEAD(&rp->view_list);
808 * Add device to list and find the smallest unused minor
809 * number for it. Note: there is no device with minor 0,
810 * see special case for fs3270.c:fs3270_open().
812 mutex_lock(&raw3270_mutex);
813 /* Keep the list sorted. */
814 minor = RAW3270_FIRSTMINOR;
816 list_for_each(l, &raw3270_devices) {
817 tmp = list_entry(l, struct raw3270, list);
818 if (tmp->minor > minor) {
820 __list_add(&rp->list, l->prev, l);
825 if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
827 list_add_tail(&rp->list, &raw3270_devices);
829 mutex_unlock(&raw3270_mutex);
830 /* No free minor number? Then give up. */
834 dev_set_drvdata(&cdev->dev, rp);
835 cdev->handler = raw3270_irq;
839 #ifdef CONFIG_TN3270_CONSOLE
841 * Setup 3270 device configured as console.
843 struct raw3270 __init *raw3270_setup_console(struct ccw_device *cdev)
849 rp = (struct raw3270 *) alloc_bootmem_low(sizeof(struct raw3270));
850 ascebc = (char *) alloc_bootmem(256);
851 rc = raw3270_setup_device(cdev, rp, ascebc);
854 set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
855 rc = raw3270_reset_device(rp);
858 rc = raw3270_size_device(rp);
861 rc = raw3270_reset_device(rp);
864 set_bit(RAW3270_FLAGS_READY, &rp->flags);
869 raw3270_wait_cons_dev(struct raw3270 *rp)
873 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
875 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
881 * Create a 3270 device structure.
883 static struct raw3270 *
884 raw3270_create_device(struct ccw_device *cdev)
890 rp = kmalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
892 return ERR_PTR(-ENOMEM);
893 ascebc = kmalloc(256, GFP_KERNEL);
896 return ERR_PTR(-ENOMEM);
898 rc = raw3270_setup_device(cdev, rp, ascebc);
904 /* Get reference to ccw_device structure. */
905 get_device(&cdev->dev);
913 raw3270_activate_view(struct raw3270_view *view)
916 struct raw3270_view *oldview, *nv;
923 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
924 if (rp->view == view)
926 else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags))
928 else if (test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
934 oldview->fn->deactivate(oldview);
937 rc = view->fn->activate(view);
939 /* Didn't work. Try to reactivate the old view. */
941 if (!oldview || oldview->fn->activate(oldview) != 0) {
942 /* Didn't work as well. Try any other view. */
943 list_for_each_entry(nv, &rp->view_list, list)
944 if (nv != view && nv != oldview) {
946 if (nv->fn->activate(nv) == 0)
953 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
958 * Deactivate current view.
961 raw3270_deactivate_view(struct raw3270_view *view)
969 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
970 if (rp->view == view) {
971 view->fn->deactivate(view);
973 /* Move deactivated view to end of list. */
974 list_del_init(&view->list);
975 list_add_tail(&view->list, &rp->view_list);
976 /* Try to activate another view. */
977 if (test_bit(RAW3270_FLAGS_READY, &rp->flags) &&
978 !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
979 list_for_each_entry(view, &rp->view_list, list) {
981 if (view->fn->activate(view) == 0)
987 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
991 * Add view to device with minor "minor".
994 raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor)
1002 mutex_lock(&raw3270_mutex);
1004 list_for_each_entry(rp, &raw3270_devices, list) {
1005 if (rp->minor != minor)
1007 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1008 if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
1009 atomic_set(&view->ref_count, 2);
1012 view->model = rp->model;
1013 view->rows = rp->rows;
1014 view->cols = rp->cols;
1015 view->ascebc = rp->ascebc;
1016 spin_lock_init(&view->lock);
1017 list_add(&view->list, &rp->view_list);
1020 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1023 mutex_unlock(&raw3270_mutex);
1028 * Find specific view of device with minor "minor".
1030 struct raw3270_view *
1031 raw3270_find_view(struct raw3270_fn *fn, int minor)
1034 struct raw3270_view *view, *tmp;
1035 unsigned long flags;
1037 mutex_lock(&raw3270_mutex);
1038 view = ERR_PTR(-ENODEV);
1039 list_for_each_entry(rp, &raw3270_devices, list) {
1040 if (rp->minor != minor)
1042 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1043 if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) {
1044 view = ERR_PTR(-ENOENT);
1045 list_for_each_entry(tmp, &rp->view_list, list) {
1046 if (tmp->fn == fn) {
1047 raw3270_get_view(tmp);
1053 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1056 mutex_unlock(&raw3270_mutex);
1061 * Remove view from device and free view structure via call to view->fn->free.
1064 raw3270_del_view(struct raw3270_view *view)
1066 unsigned long flags;
1068 struct raw3270_view *nv;
1071 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1072 if (rp->view == view) {
1073 view->fn->deactivate(view);
1076 list_del_init(&view->list);
1077 if (!rp->view && test_bit(RAW3270_FLAGS_READY, &rp->flags) &&
1078 !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
1079 /* Try to activate another view. */
1080 list_for_each_entry(nv, &rp->view_list, list) {
1081 if (nv->fn->activate(nv) == 0) {
1087 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1088 /* Wait for reference counter to drop to zero. */
1089 atomic_dec(&view->ref_count);
1090 wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
1092 view->fn->free(view);
1096 * Remove a 3270 device structure.
1099 raw3270_delete_device(struct raw3270 *rp)
1101 struct ccw_device *cdev;
1103 /* Remove from device chain. */
1104 mutex_lock(&raw3270_mutex);
1105 if (rp->clttydev && !IS_ERR(rp->clttydev))
1106 device_destroy(class3270, MKDEV(IBM_TTY3270_MAJOR, rp->minor));
1107 if (rp->cltubdev && !IS_ERR(rp->cltubdev))
1108 device_destroy(class3270, MKDEV(IBM_FS3270_MAJOR, rp->minor));
1109 list_del_init(&rp->list);
1110 mutex_unlock(&raw3270_mutex);
1112 /* Disconnect from ccw_device. */
1115 dev_set_drvdata(&cdev->dev, NULL);
1116 cdev->handler = NULL;
1118 /* Put ccw_device structure. */
1119 put_device(&cdev->dev);
1121 /* Now free raw3270 structure. */
1127 raw3270_probe (struct ccw_device *cdev)
1133 * Additional attributes for a 3270 device
1136 raw3270_model_show(struct device *dev, struct device_attribute *attr, char *buf)
1138 return snprintf(buf, PAGE_SIZE, "%i\n",
1139 ((struct raw3270 *) dev_get_drvdata(dev))->model);
1141 static DEVICE_ATTR(model, 0444, raw3270_model_show, NULL);
1144 raw3270_rows_show(struct device *dev, struct device_attribute *attr, char *buf)
1146 return snprintf(buf, PAGE_SIZE, "%i\n",
1147 ((struct raw3270 *) dev_get_drvdata(dev))->rows);
1149 static DEVICE_ATTR(rows, 0444, raw3270_rows_show, NULL);
1152 raw3270_columns_show(struct device *dev, struct device_attribute *attr, char *buf)
1154 return snprintf(buf, PAGE_SIZE, "%i\n",
1155 ((struct raw3270 *) dev_get_drvdata(dev))->cols);
1157 static DEVICE_ATTR(columns, 0444, raw3270_columns_show, NULL);
1159 static struct attribute * raw3270_attrs[] = {
1160 &dev_attr_model.attr,
1161 &dev_attr_rows.attr,
1162 &dev_attr_columns.attr,
1166 static struct attribute_group raw3270_attr_group = {
1167 .attrs = raw3270_attrs,
1170 static int raw3270_create_attributes(struct raw3270 *rp)
1174 rc = sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
1178 rp->clttydev = device_create(class3270, &rp->cdev->dev,
1179 MKDEV(IBM_TTY3270_MAJOR, rp->minor), NULL,
1180 "tty%s", dev_name(&rp->cdev->dev));
1181 if (IS_ERR(rp->clttydev)) {
1182 rc = PTR_ERR(rp->clttydev);
1186 rp->cltubdev = device_create(class3270, &rp->cdev->dev,
1187 MKDEV(IBM_FS3270_MAJOR, rp->minor), NULL,
1188 "tub%s", dev_name(&rp->cdev->dev));
1189 if (!IS_ERR(rp->cltubdev))
1192 rc = PTR_ERR(rp->cltubdev);
1193 device_destroy(class3270, MKDEV(IBM_TTY3270_MAJOR, rp->minor));
1196 sysfs_remove_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
1202 * Notifier for device addition/removal
1204 struct raw3270_notifier {
1205 struct list_head list;
1206 void (*notifier)(int, int);
1209 static LIST_HEAD(raw3270_notifier);
1211 int raw3270_register_notifier(void (*notifier)(int, int))
1213 struct raw3270_notifier *np;
1216 np = kmalloc(sizeof(struct raw3270_notifier), GFP_KERNEL);
1219 np->notifier = notifier;
1220 mutex_lock(&raw3270_mutex);
1221 list_add_tail(&np->list, &raw3270_notifier);
1222 list_for_each_entry(rp, &raw3270_devices, list) {
1223 get_device(&rp->cdev->dev);
1224 notifier(rp->minor, 1);
1226 mutex_unlock(&raw3270_mutex);
1230 void raw3270_unregister_notifier(void (*notifier)(int, int))
1232 struct raw3270_notifier *np;
1234 mutex_lock(&raw3270_mutex);
1235 list_for_each_entry(np, &raw3270_notifier, list)
1236 if (np->notifier == notifier) {
1237 list_del(&np->list);
1241 mutex_unlock(&raw3270_mutex);
1245 * Set 3270 device online.
1248 raw3270_set_online (struct ccw_device *cdev)
1251 struct raw3270_notifier *np;
1254 rp = raw3270_create_device(cdev);
1257 rc = raw3270_reset_device(rp);
1260 rc = raw3270_size_device(rp);
1263 rc = raw3270_reset_device(rp);
1266 rc = raw3270_create_attributes(rp);
1269 set_bit(RAW3270_FLAGS_READY, &rp->flags);
1270 mutex_lock(&raw3270_mutex);
1271 list_for_each_entry(np, &raw3270_notifier, list)
1272 np->notifier(rp->minor, 1);
1273 mutex_unlock(&raw3270_mutex);
1277 raw3270_delete_device(rp);
1282 * Remove 3270 device structure.
1285 raw3270_remove (struct ccw_device *cdev)
1287 unsigned long flags;
1289 struct raw3270_view *v;
1290 struct raw3270_notifier *np;
1292 rp = dev_get_drvdata(&cdev->dev);
1294 * _remove is the opposite of _probe; it's probe that
1295 * should set up rp. raw3270_remove gets entered for
1296 * devices even if they haven't been varied online.
1297 * Thus, rp may validly be NULL here.
1301 clear_bit(RAW3270_FLAGS_READY, &rp->flags);
1303 sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);
1305 /* Deactivate current view and remove all views. */
1306 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1308 rp->view->fn->deactivate(rp->view);
1311 while (!list_empty(&rp->view_list)) {
1312 v = list_entry(rp->view_list.next, struct raw3270_view, list);
1315 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1316 raw3270_del_view(v);
1317 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1319 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1321 mutex_lock(&raw3270_mutex);
1322 list_for_each_entry(np, &raw3270_notifier, list)
1323 np->notifier(rp->minor, 0);
1324 mutex_unlock(&raw3270_mutex);
1326 /* Reset 3270 device. */
1327 raw3270_reset_device(rp);
1328 /* And finally remove it. */
1329 raw3270_delete_device(rp);
1333 * Set 3270 device offline.
1336 raw3270_set_offline (struct ccw_device *cdev)
1340 rp = dev_get_drvdata(&cdev->dev);
1341 if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
1343 raw3270_remove(cdev);
1347 static int raw3270_pm_stop(struct ccw_device *cdev)
1350 struct raw3270_view *view;
1351 unsigned long flags;
1353 rp = cdev->dev.driver_data;
1356 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1358 rp->view->fn->deactivate(rp->view);
1359 if (!test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) {
1361 * Release tty and fullscreen for all non-console
1364 list_for_each_entry(view, &rp->view_list, list) {
1365 if (view->fn->release)
1366 view->fn->release(view);
1369 set_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
1370 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1374 static int raw3270_pm_start(struct ccw_device *cdev)
1377 unsigned long flags;
1379 rp = cdev->dev.driver_data;
1382 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1383 clear_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
1385 rp->view->fn->activate(rp->view);
1386 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1390 void raw3270_pm_unfreeze(struct raw3270_view *view)
1395 if (rp && test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
1396 ccw_device_force_console();
1399 static struct ccw_device_id raw3270_id[] = {
1400 { CCW_DEVICE(0x3270, 0) },
1401 { CCW_DEVICE(0x3271, 0) },
1402 { CCW_DEVICE(0x3272, 0) },
1403 { CCW_DEVICE(0x3273, 0) },
1404 { CCW_DEVICE(0x3274, 0) },
1405 { CCW_DEVICE(0x3275, 0) },
1406 { CCW_DEVICE(0x3276, 0) },
1407 { CCW_DEVICE(0x3277, 0) },
1408 { CCW_DEVICE(0x3278, 0) },
1409 { CCW_DEVICE(0x3279, 0) },
1410 { CCW_DEVICE(0x3174, 0) },
1411 { /* end of list */ },
1414 static struct ccw_driver raw3270_ccw_driver = {
1416 .owner = THIS_MODULE,
1418 .probe = &raw3270_probe,
1419 .remove = &raw3270_remove,
1420 .set_online = &raw3270_set_online,
1421 .set_offline = &raw3270_set_offline,
1422 .freeze = &raw3270_pm_stop,
1423 .thaw = &raw3270_pm_start,
1424 .restore = &raw3270_pm_start,
1433 if (raw3270_registered)
1435 raw3270_registered = 1;
1436 rc = ccw_driver_register(&raw3270_ccw_driver);
1438 /* Create attributes for early (= console) device. */
1439 mutex_lock(&raw3270_mutex);
1440 class3270 = class_create(THIS_MODULE, "3270");
1441 list_for_each_entry(rp, &raw3270_devices, list) {
1442 get_device(&rp->cdev->dev);
1443 raw3270_create_attributes(rp);
1445 mutex_unlock(&raw3270_mutex);
1453 ccw_driver_unregister(&raw3270_ccw_driver);
1454 class_destroy(class3270);
1457 MODULE_LICENSE("GPL");
1459 module_init(raw3270_init);
1460 module_exit(raw3270_exit);
1462 EXPORT_SYMBOL(raw3270_request_alloc);
1463 EXPORT_SYMBOL(raw3270_request_free);
1464 EXPORT_SYMBOL(raw3270_request_reset);
1465 EXPORT_SYMBOL(raw3270_request_set_cmd);
1466 EXPORT_SYMBOL(raw3270_request_add_data);
1467 EXPORT_SYMBOL(raw3270_request_set_data);
1468 EXPORT_SYMBOL(raw3270_request_set_idal);
1469 EXPORT_SYMBOL(raw3270_buffer_address);
1470 EXPORT_SYMBOL(raw3270_add_view);
1471 EXPORT_SYMBOL(raw3270_del_view);
1472 EXPORT_SYMBOL(raw3270_find_view);
1473 EXPORT_SYMBOL(raw3270_activate_view);
1474 EXPORT_SYMBOL(raw3270_deactivate_view);
1475 EXPORT_SYMBOL(raw3270_start);
1476 EXPORT_SYMBOL(raw3270_start_locked);
1477 EXPORT_SYMBOL(raw3270_start_irq);
1478 EXPORT_SYMBOL(raw3270_reset);
1479 EXPORT_SYMBOL(raw3270_register_notifier);
1480 EXPORT_SYMBOL(raw3270_unregister_notifier);
1481 EXPORT_SYMBOL(raw3270_wait_queue);