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/module.h>
11 #include <linux/err.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/list.h>
15 #include <linux/slab.h>
16 #include <linux/types.h>
17 #include <linux/wait.h>
19 #include <asm/ccwdev.h>
21 #include <asm/ebcdic.h>
26 #include <linux/major.h>
27 #include <linux/kdev_t.h>
28 #include <linux/device.h>
29 #include <linux/mutex.h>
31 struct class *class3270;
33 /* The main 3270 data structure. */
35 struct list_head list;
36 struct ccw_device *cdev;
39 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 */
51 struct raw3270_view init_view;
52 struct raw3270_request init_reset;
53 struct raw3270_request init_readpart;
54 struct raw3270_request init_readmod;
55 unsigned char init_data[256];
59 #define RAW3270_STATE_INIT 0 /* Initial state */
60 #define RAW3270_STATE_RESET 1 /* Reset command is pending */
61 #define RAW3270_STATE_W4ATTN 2 /* Wait for attention interrupt */
62 #define RAW3270_STATE_READMOD 3 /* Read partition is pending */
63 #define RAW3270_STATE_READY 4 /* Device is usable by views */
66 #define RAW3270_FLAGS_14BITADDR 0 /* 14-bit buffer addresses */
67 #define RAW3270_FLAGS_BUSY 1 /* Device busy, leave it alone */
68 #define RAW3270_FLAGS_CONSOLE 2 /* Device is the console. */
69 #define RAW3270_FLAGS_FROZEN 3 /* set if 3270 is frozen for suspend */
71 /* Semaphore to protect global data of raw3270 (devices, views, etc). */
72 static DEFINE_MUTEX(raw3270_mutex);
74 /* List of 3270 devices. */
75 static LIST_HEAD(raw3270_devices);
78 * Flag to indicate if the driver has been registered. Some operations
79 * like waiting for the end of i/o need to be done differently as long
80 * as the kernel is still starting up (console support).
82 static int raw3270_registered;
84 /* Module parameters */
85 static bool tubxcorrect = 0;
86 module_param(tubxcorrect, bool, 0);
89 * Wait queue for device init/delete, view delete.
91 DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue);
94 * Encode array for 12 bit 3270 addresses.
96 static unsigned char raw3270_ebcgraf[64] = {
97 0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
98 0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
99 0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
100 0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
101 0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
102 0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
103 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
104 0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f
107 static inline int raw3270_state_ready(struct raw3270 *rp)
109 return rp->state == RAW3270_STATE_READY;
112 static inline int raw3270_state_final(struct raw3270 *rp)
114 return rp->state == RAW3270_STATE_INIT ||
115 rp->state == RAW3270_STATE_READY;
119 raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr)
121 if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) {
122 cp[0] = (addr >> 8) & 0x3f;
125 cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f];
126 cp[1] = raw3270_ebcgraf[addr & 0x3f];
131 * Allocate a new 3270 ccw request
133 struct raw3270_request *
134 raw3270_request_alloc(size_t size)
136 struct raw3270_request *rq;
138 /* Allocate request structure */
139 rq = kzalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA);
141 return ERR_PTR(-ENOMEM);
143 /* alloc output buffer. */
145 rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA);
148 return ERR_PTR(-ENOMEM);
152 INIT_LIST_HEAD(&rq->list);
157 rq->ccw.cda = __pa(rq->buffer);
158 rq->ccw.flags = CCW_FLAG_SLI;
164 * Free 3270 ccw request
167 raw3270_request_free (struct raw3270_request *rq)
174 * Reset request to initial state.
177 raw3270_request_reset(struct raw3270_request *rq)
179 BUG_ON(!list_empty(&rq->list));
180 rq->ccw.cmd_code = 0;
182 rq->ccw.cda = __pa(rq->buffer);
183 rq->ccw.flags = CCW_FLAG_SLI;
189 * Set command code to ccw of a request.
192 raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd)
194 rq->ccw.cmd_code = cmd;
198 * Add data fragment to output buffer.
201 raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size)
203 if (size + rq->ccw.count > rq->size)
205 memcpy(rq->buffer + rq->ccw.count, data, size);
206 rq->ccw.count += size;
211 * Set address/length pair to ccw of a request.
214 raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size)
216 rq->ccw.cda = __pa(data);
217 rq->ccw.count = size;
221 * Set idal buffer to ccw of a request.
224 raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib)
226 rq->ccw.cda = __pa(ib->data);
227 rq->ccw.count = ib->size;
228 rq->ccw.flags |= CCW_FLAG_IDA;
235 __raw3270_halt_io(struct raw3270 *rp, struct raw3270_request *rq)
240 if (raw3270_request_final(rq))
242 /* Check if interrupt has already been processed */
243 for (retries = 0; retries < 5; retries++) {
245 rc = ccw_device_halt(rp->cdev, (long) rq);
247 rc = ccw_device_clear(rp->cdev, (long) rq);
249 break; /* termination successful */
255 * Add the request to the request queue, try to start it if the
256 * 3270 device is idle. Return without waiting for end of i/o.
259 __raw3270_start(struct raw3270 *rp, struct raw3270_view *view,
260 struct raw3270_request *rq)
263 raw3270_get_view(view);
264 if (list_empty(&rp->req_queue) &&
265 !test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
266 /* No other requests are on the queue. Start this one. */
267 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
268 (unsigned long) rq, 0, 0);
270 raw3270_put_view(view);
274 list_add_tail(&rq->list, &rp->req_queue);
279 raw3270_view_active(struct raw3270_view *view)
281 struct raw3270 *rp = view->dev;
283 return rp && rp->view == view &&
284 !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
288 raw3270_start(struct raw3270_view *view, struct raw3270_request *rq)
294 spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags);
296 if (!rp || rp->view != view ||
297 test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
299 else if (!raw3270_state_ready(rp))
302 rc = __raw3270_start(rp, view, rq);
303 spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags);
308 raw3270_start_locked(struct raw3270_view *view, struct raw3270_request *rq)
314 if (!rp || rp->view != view ||
315 test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
317 else if (!raw3270_state_ready(rp))
320 rc = __raw3270_start(rp, view, rq);
325 raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq)
331 raw3270_get_view(view);
332 list_add_tail(&rq->list, &rp->req_queue);
337 * 3270 interrupt routine, called from the ccw_device layer
340 raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
343 struct raw3270_view *view;
344 struct raw3270_request *rq;
347 rp = dev_get_drvdata(&cdev->dev);
350 rq = (struct raw3270_request *) intparm;
351 view = rq ? rq->view : rp->view;
354 rc = RAW3270_IO_RETRY;
355 else if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
357 rc = RAW3270_IO_DONE;
358 } else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END |
359 DEV_STAT_UNIT_EXCEP)) {
360 /* Handle CE-DE-UE and subsequent UDE */
361 set_bit(RAW3270_FLAGS_BUSY, &rp->flags);
362 rc = RAW3270_IO_BUSY;
363 } else if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) {
364 /* Wait for UDE if busy flag is set. */
365 if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
366 clear_bit(RAW3270_FLAGS_BUSY, &rp->flags);
367 /* Got it, now retry. */
368 rc = RAW3270_IO_RETRY;
370 rc = RAW3270_IO_BUSY;
372 rc = view->fn->intv(view, rq, irb);
374 rc = RAW3270_IO_DONE;
377 case RAW3270_IO_DONE:
379 case RAW3270_IO_BUSY:
381 * Intervention required by the operator. We have to wait
382 * for unsolicited device end.
385 case RAW3270_IO_RETRY:
388 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
389 (unsigned long) rq, 0, 0);
391 return; /* Successfully restarted. */
393 case RAW3270_IO_STOP:
396 __raw3270_halt_io(rp, rq);
403 BUG_ON(list_empty(&rq->list));
404 /* The request completed, remove from queue and do callback. */
405 list_del_init(&rq->list);
407 rq->callback(rq, rq->callback_data);
408 /* Do put_device for get_device in raw3270_start. */
409 raw3270_put_view(view);
412 * Try to start each request on request queue until one is
413 * started successful.
415 while (!list_empty(&rp->req_queue)) {
416 rq = list_entry(rp->req_queue.next,struct raw3270_request,list);
417 rq->rc = ccw_device_start(rp->cdev, &rq->ccw,
418 (unsigned long) rq, 0, 0);
421 /* Start failed. Remove request 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);
431 * To determine the size of the 3270 device we need to do:
432 * 1) send a 'read partition' data stream to the device
433 * 2) wait for the attn interrupt that precedes the query reply
434 * 3) do a read modified to get the query reply
435 * To make things worse we have to cope with intervention
436 * required (3270 device switched to 'stand-by') and command
437 * rejects (old devices that can't do 'read partition').
439 struct raw3270_ua { /* Query Reply structure for Usable Area */
440 struct { /* Usable Area Query Reply Base */
441 short l; /* Length of this structured field */
442 char sfid; /* 0x81 if Query Reply */
443 char qcode; /* 0x81 if Usable Area */
446 short w; /* Width of usable area */
447 short h; /* Heigth of usavle area */
448 char units; /* 0x00:in; 0x01:mm */
453 short buffsz; /* Character buffer size, bytes */
458 } __attribute__ ((packed)) uab;
459 struct { /* Alternate Usable Area Self-Defining Parameter */
460 char l; /* Length of this Self-Defining Parm */
461 char sdpid; /* 0x02 if Alternate Usable Area */
463 char auaid; /* 0x01 is Id for the A U A */
464 short wauai; /* Width of AUAi */
465 short hauai; /* Height of AUAi */
466 char auaunits; /* 0x00:in, 0x01:mm */
471 } __attribute__ ((packed)) aua;
472 } __attribute__ ((packed));
475 raw3270_size_device_vm(struct raw3270 *rp)
478 struct ccw_dev_id dev_id;
479 struct diag210 diag_data;
481 ccw_device_get_id(rp->cdev, &dev_id);
482 diag_data.vrdcdvno = dev_id.devno;
483 diag_data.vrdclen = sizeof(struct diag210);
484 rc = diag210(&diag_data);
485 model = diag_data.vrdccrmd;
486 /* Use default model 2 if the size could not be detected */
487 if (rc || model < 2 || model > 5)
514 raw3270_size_device(struct raw3270 *rp)
516 struct raw3270_ua *uap;
518 /* Got a Query Reply */
519 uap = (struct raw3270_ua *) (rp->init_data + 1);
520 /* Paranoia check. */
521 if (rp->init_readmod.rc || rp->init_data[0] != 0x88 ||
522 uap->uab.qcode != 0x81) {
523 /* Couldn't detect size. Use default model 2. */
529 /* Copy rows/columns of default Usable Area */
530 rp->rows = uap->uab.h;
531 rp->cols = uap->uab.w;
532 /* Check for 14 bit addressing */
533 if ((uap->uab.flags0 & 0x0d) == 0x01)
534 set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags);
535 /* Check for Alternate Usable Area */
536 if (uap->uab.l == sizeof(struct raw3270_ua) &&
537 uap->aua.sdpid == 0x02) {
538 rp->rows = uap->aua.hauai;
539 rp->cols = uap->aua.wauai;
541 /* Try to find a model. */
543 if (rp->rows == 24 && rp->cols == 80)
545 if (rp->rows == 32 && rp->cols == 80)
547 if (rp->rows == 43 && rp->cols == 80)
549 if (rp->rows == 27 && rp->cols == 132)
554 raw3270_size_device_done(struct raw3270 *rp)
556 struct raw3270_view *view;
559 rp->state = RAW3270_STATE_READY;
560 /* Notify views about new size */
561 list_for_each_entry(view, &rp->view_list, list)
562 if (view->fn->resize)
563 view->fn->resize(view, rp->model, rp->rows, rp->cols);
564 /* Setup processing done, now activate a view */
565 list_for_each_entry(view, &rp->view_list, list) {
567 if (view->fn->activate(view) == 0)
574 raw3270_read_modified_cb(struct raw3270_request *rq, void *data)
576 struct raw3270 *rp = rq->view->dev;
578 raw3270_size_device(rp);
579 raw3270_size_device_done(rp);
583 raw3270_read_modified(struct raw3270 *rp)
585 if (rp->state != RAW3270_STATE_W4ATTN)
587 /* Use 'read modified' to get the result of a read partition. */
588 memset(&rp->init_readmod, 0, sizeof(rp->init_readmod));
589 memset(&rp->init_data, 0, sizeof(rp->init_data));
590 rp->init_readmod.ccw.cmd_code = TC_READMOD;
591 rp->init_readmod.ccw.flags = CCW_FLAG_SLI;
592 rp->init_readmod.ccw.count = sizeof(rp->init_data);
593 rp->init_readmod.ccw.cda = (__u32) __pa(rp->init_data);
594 rp->init_readmod.callback = raw3270_read_modified_cb;
595 rp->state = RAW3270_STATE_READMOD;
596 raw3270_start_irq(&rp->init_view, &rp->init_readmod);
600 raw3270_writesf_readpart(struct raw3270 *rp)
602 static const unsigned char wbuf[] =
603 { 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 };
605 /* Store 'read partition' data stream to init_data */
606 memset(&rp->init_readpart, 0, sizeof(rp->init_readpart));
607 memset(&rp->init_data, 0, sizeof(rp->init_data));
608 memcpy(&rp->init_data, wbuf, sizeof(wbuf));
609 rp->init_readpart.ccw.cmd_code = TC_WRITESF;
610 rp->init_readpart.ccw.flags = CCW_FLAG_SLI;
611 rp->init_readpart.ccw.count = sizeof(wbuf);
612 rp->init_readpart.ccw.cda = (__u32) __pa(&rp->init_data);
613 rp->state = RAW3270_STATE_W4ATTN;
614 raw3270_start_irq(&rp->init_view, &rp->init_readpart);
621 raw3270_reset_device_cb(struct raw3270_request *rq, void *data)
623 struct raw3270 *rp = rq->view->dev;
625 if (rp->state != RAW3270_STATE_RESET)
628 /* Reset command failed. */
629 rp->state = RAW3270_STATE_INIT;
630 } else if (MACHINE_IS_VM) {
631 raw3270_size_device_vm(rp);
632 raw3270_size_device_done(rp);
634 raw3270_writesf_readpart(rp);
635 memset(&rp->init_reset, 0, sizeof(rp->init_reset));
639 __raw3270_reset_device(struct raw3270 *rp)
643 /* Check if reset is already pending */
644 if (rp->init_reset.view)
646 /* Store reset data stream to init_data/init_reset */
647 rp->init_data[0] = TW_KR;
648 rp->init_reset.ccw.cmd_code = TC_EWRITEA;
649 rp->init_reset.ccw.flags = CCW_FLAG_SLI;
650 rp->init_reset.ccw.count = 1;
651 rp->init_reset.ccw.cda = (__u32) __pa(rp->init_data);
652 rp->init_reset.callback = raw3270_reset_device_cb;
653 rc = __raw3270_start(rp, &rp->init_view, &rp->init_reset);
654 if (rc == 0 && rp->state == RAW3270_STATE_INIT)
655 rp->state = RAW3270_STATE_RESET;
660 raw3270_reset_device(struct raw3270 *rp)
665 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
666 rc = __raw3270_reset_device(rp);
667 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
672 raw3270_reset(struct raw3270_view *view)
678 if (!rp || rp->view != view ||
679 test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
681 else if (!raw3270_state_ready(rp))
684 rc = raw3270_reset_device(view->dev);
689 raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq,
695 * Unit-Check Processing:
696 * Expect Command Reject or Intervention Required.
698 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
699 /* Request finished abnormally. */
700 if (irb->ecw[0] & SNS0_INTERVENTION_REQ) {
701 set_bit(RAW3270_FLAGS_BUSY, &view->dev->flags);
702 return RAW3270_IO_BUSY;
706 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
707 if (irb->ecw[0] & SNS0_CMD_REJECT)
708 rq->rc = -EOPNOTSUPP;
713 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
714 /* Queue read modified after attention interrupt */
716 raw3270_read_modified(rp);
718 return RAW3270_IO_DONE;
721 static struct raw3270_fn raw3270_init_fn = {
722 .intv = raw3270_init_irq
726 * Setup new 3270 device.
729 raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc)
735 memset(rp, 0, sizeof(struct raw3270));
736 /* Copy ebcdic -> ascii translation table. */
737 memcpy(ascebc, _ascebc, 256);
739 /* correct brackets and circumflex */
750 INIT_LIST_HEAD(&rp->req_queue);
751 INIT_LIST_HEAD(&rp->view_list);
753 rp->init_view.dev = rp;
754 rp->init_view.fn = &raw3270_init_fn;
755 rp->view = &rp->init_view;
758 * Add device to list and find the smallest unused minor
759 * number for it. Note: there is no device with minor 0,
760 * see special case for fs3270.c:fs3270_open().
762 mutex_lock(&raw3270_mutex);
763 /* Keep the list sorted. */
764 minor = RAW3270_FIRSTMINOR;
766 list_for_each(l, &raw3270_devices) {
767 tmp = list_entry(l, struct raw3270, list);
768 if (tmp->minor > minor) {
770 __list_add(&rp->list, l->prev, l);
775 if (rp->minor == -1 && minor < RAW3270_MAXDEVS + RAW3270_FIRSTMINOR) {
777 list_add_tail(&rp->list, &raw3270_devices);
779 mutex_unlock(&raw3270_mutex);
780 /* No free minor number? Then give up. */
784 dev_set_drvdata(&cdev->dev, rp);
785 cdev->handler = raw3270_irq;
789 #ifdef CONFIG_TN3270_CONSOLE
790 /* Tentative definition - see below for actual definition. */
791 static struct ccw_driver raw3270_ccw_driver;
794 * Setup 3270 device configured as console.
796 struct raw3270 __init *raw3270_setup_console(void)
798 struct ccw_device *cdev;
804 cdev = ccw_device_create_console(&raw3270_ccw_driver);
806 return ERR_CAST(cdev);
808 rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
809 ascebc = kzalloc(256, GFP_KERNEL);
810 rc = raw3270_setup_device(cdev, rp, ascebc);
813 set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags);
815 rc = ccw_device_enable_console(cdev);
817 ccw_device_destroy_console(cdev);
821 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
823 __raw3270_reset_device(rp);
824 while (!raw3270_state_final(rp)) {
825 ccw_device_wait_idle(rp->cdev);
828 } while (rp->state != RAW3270_STATE_READY);
829 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
834 raw3270_wait_cons_dev(struct raw3270 *rp)
838 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
839 ccw_device_wait_idle(rp->cdev);
840 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
846 * Create a 3270 device structure.
848 static struct raw3270 *
849 raw3270_create_device(struct ccw_device *cdev)
855 rp = kzalloc(sizeof(struct raw3270), GFP_KERNEL | GFP_DMA);
857 return ERR_PTR(-ENOMEM);
858 ascebc = kmalloc(256, GFP_KERNEL);
861 return ERR_PTR(-ENOMEM);
863 rc = raw3270_setup_device(cdev, rp, ascebc);
869 /* Get reference to ccw_device structure. */
870 get_device(&cdev->dev);
878 raw3270_activate_view(struct raw3270_view *view)
881 struct raw3270_view *oldview, *nv;
888 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
889 if (rp->view == view)
891 else if (!raw3270_state_ready(rp))
893 else if (test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
897 if (rp->view && rp->view->fn->deactivate) {
899 oldview->fn->deactivate(oldview);
902 rc = view->fn->activate(view);
904 /* Didn't work. Try to reactivate the old view. */
906 if (!oldview || oldview->fn->activate(oldview) != 0) {
907 /* Didn't work as well. Try any other view. */
908 list_for_each_entry(nv, &rp->view_list, list)
909 if (nv != view && nv != oldview) {
911 if (nv->fn->activate(nv) == 0)
918 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
923 * Deactivate current view.
926 raw3270_deactivate_view(struct raw3270_view *view)
934 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
935 if (rp->view == view) {
936 view->fn->deactivate(view);
938 /* Move deactivated view to end of list. */
939 list_del_init(&view->list);
940 list_add_tail(&view->list, &rp->view_list);
941 /* Try to activate another view. */
942 if (raw3270_state_ready(rp) &&
943 !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
944 list_for_each_entry(view, &rp->view_list, list) {
946 if (view->fn->activate(view) == 0)
952 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
956 * Add view to device with minor "minor".
959 raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor)
967 mutex_lock(&raw3270_mutex);
969 list_for_each_entry(rp, &raw3270_devices, list) {
970 if (rp->minor != minor)
972 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
973 atomic_set(&view->ref_count, 2);
976 view->model = rp->model;
977 view->rows = rp->rows;
978 view->cols = rp->cols;
979 view->ascebc = rp->ascebc;
980 spin_lock_init(&view->lock);
981 list_add(&view->list, &rp->view_list);
983 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
986 mutex_unlock(&raw3270_mutex);
991 * Find specific view of device with minor "minor".
993 struct raw3270_view *
994 raw3270_find_view(struct raw3270_fn *fn, int minor)
997 struct raw3270_view *view, *tmp;
1000 mutex_lock(&raw3270_mutex);
1001 view = ERR_PTR(-ENODEV);
1002 list_for_each_entry(rp, &raw3270_devices, list) {
1003 if (rp->minor != minor)
1005 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1006 list_for_each_entry(tmp, &rp->view_list, list) {
1007 if (tmp->fn == fn) {
1008 raw3270_get_view(tmp);
1013 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1016 mutex_unlock(&raw3270_mutex);
1021 * Remove view from device and free view structure via call to view->fn->free.
1024 raw3270_del_view(struct raw3270_view *view)
1026 unsigned long flags;
1028 struct raw3270_view *nv;
1031 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1032 if (rp->view == view) {
1033 view->fn->deactivate(view);
1036 list_del_init(&view->list);
1037 if (!rp->view && raw3270_state_ready(rp) &&
1038 !test_bit(RAW3270_FLAGS_FROZEN, &rp->flags)) {
1039 /* Try to activate another view. */
1040 list_for_each_entry(nv, &rp->view_list, list) {
1041 if (nv->fn->activate(nv) == 0) {
1047 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1048 /* Wait for reference counter to drop to zero. */
1049 atomic_dec(&view->ref_count);
1050 wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0);
1052 view->fn->free(view);
1056 * Remove a 3270 device structure.
1059 raw3270_delete_device(struct raw3270 *rp)
1061 struct ccw_device *cdev;
1063 /* Remove from device chain. */
1064 mutex_lock(&raw3270_mutex);
1065 list_del_init(&rp->list);
1066 mutex_unlock(&raw3270_mutex);
1068 /* Disconnect from ccw_device. */
1071 dev_set_drvdata(&cdev->dev, NULL);
1072 cdev->handler = NULL;
1074 /* Put ccw_device structure. */
1075 put_device(&cdev->dev);
1077 /* Now free raw3270 structure. */
1083 raw3270_probe (struct ccw_device *cdev)
1089 * Additional attributes for a 3270 device
1092 raw3270_model_show(struct device *dev, struct device_attribute *attr, char *buf)
1094 return snprintf(buf, PAGE_SIZE, "%i\n",
1095 ((struct raw3270 *) dev_get_drvdata(dev))->model);
1097 static DEVICE_ATTR(model, 0444, raw3270_model_show, NULL);
1100 raw3270_rows_show(struct device *dev, struct device_attribute *attr, char *buf)
1102 return snprintf(buf, PAGE_SIZE, "%i\n",
1103 ((struct raw3270 *) dev_get_drvdata(dev))->rows);
1105 static DEVICE_ATTR(rows, 0444, raw3270_rows_show, NULL);
1108 raw3270_columns_show(struct device *dev, struct device_attribute *attr, char *buf)
1110 return snprintf(buf, PAGE_SIZE, "%i\n",
1111 ((struct raw3270 *) dev_get_drvdata(dev))->cols);
1113 static DEVICE_ATTR(columns, 0444, raw3270_columns_show, NULL);
1115 static struct attribute * raw3270_attrs[] = {
1116 &dev_attr_model.attr,
1117 &dev_attr_rows.attr,
1118 &dev_attr_columns.attr,
1122 static struct attribute_group raw3270_attr_group = {
1123 .attrs = raw3270_attrs,
1126 static int raw3270_create_attributes(struct raw3270 *rp)
1128 return sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group);
1132 * Notifier for device addition/removal
1134 static LIST_HEAD(raw3270_notifier);
1136 int raw3270_register_notifier(struct raw3270_notifier *notifier)
1140 mutex_lock(&raw3270_mutex);
1141 list_add_tail(¬ifier->list, &raw3270_notifier);
1142 list_for_each_entry(rp, &raw3270_devices, list)
1143 notifier->create(rp->minor);
1144 mutex_unlock(&raw3270_mutex);
1148 void raw3270_unregister_notifier(struct raw3270_notifier *notifier)
1152 mutex_lock(&raw3270_mutex);
1153 list_for_each_entry(rp, &raw3270_devices, list)
1154 notifier->destroy(rp->minor);
1155 list_del(¬ifier->list);
1156 mutex_unlock(&raw3270_mutex);
1160 * Set 3270 device online.
1163 raw3270_set_online (struct ccw_device *cdev)
1165 struct raw3270_notifier *np;
1169 rp = raw3270_create_device(cdev);
1172 rc = raw3270_create_attributes(rp);
1175 raw3270_reset_device(rp);
1176 mutex_lock(&raw3270_mutex);
1177 list_for_each_entry(np, &raw3270_notifier, list)
1178 np->create(rp->minor);
1179 mutex_unlock(&raw3270_mutex);
1183 raw3270_delete_device(rp);
1188 * Remove 3270 device structure.
1191 raw3270_remove (struct ccw_device *cdev)
1193 unsigned long flags;
1195 struct raw3270_view *v;
1196 struct raw3270_notifier *np;
1198 rp = dev_get_drvdata(&cdev->dev);
1200 * _remove is the opposite of _probe; it's probe that
1201 * should set up rp. raw3270_remove gets entered for
1202 * devices even if they haven't been varied online.
1203 * Thus, rp may validly be NULL here.
1208 sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group);
1210 /* Deactivate current view and remove all views. */
1211 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1213 if (rp->view->fn->deactivate)
1214 rp->view->fn->deactivate(rp->view);
1217 while (!list_empty(&rp->view_list)) {
1218 v = list_entry(rp->view_list.next, struct raw3270_view, list);
1221 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1222 raw3270_del_view(v);
1223 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1225 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1227 mutex_lock(&raw3270_mutex);
1228 list_for_each_entry(np, &raw3270_notifier, list)
1229 np->destroy(rp->minor);
1230 mutex_unlock(&raw3270_mutex);
1232 /* Reset 3270 device. */
1233 raw3270_reset_device(rp);
1234 /* And finally remove it. */
1235 raw3270_delete_device(rp);
1239 * Set 3270 device offline.
1242 raw3270_set_offline (struct ccw_device *cdev)
1246 rp = dev_get_drvdata(&cdev->dev);
1247 if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags))
1249 raw3270_remove(cdev);
1253 static int raw3270_pm_stop(struct ccw_device *cdev)
1256 struct raw3270_view *view;
1257 unsigned long flags;
1259 rp = dev_get_drvdata(&cdev->dev);
1262 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1263 if (rp->view && rp->view->fn->deactivate)
1264 rp->view->fn->deactivate(rp->view);
1265 if (!test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) {
1267 * Release tty and fullscreen for all non-console
1270 list_for_each_entry(view, &rp->view_list, list) {
1271 if (view->fn->release)
1272 view->fn->release(view);
1275 set_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
1276 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1280 static int raw3270_pm_start(struct ccw_device *cdev)
1283 unsigned long flags;
1285 rp = dev_get_drvdata(&cdev->dev);
1288 spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags);
1289 clear_bit(RAW3270_FLAGS_FROZEN, &rp->flags);
1290 if (rp->view && rp->view->fn->activate)
1291 rp->view->fn->activate(rp->view);
1292 spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
1296 void raw3270_pm_unfreeze(struct raw3270_view *view)
1298 #ifdef CONFIG_TN3270_CONSOLE
1302 if (rp && test_bit(RAW3270_FLAGS_FROZEN, &rp->flags))
1303 ccw_device_force_console(rp->cdev);
1307 static struct ccw_device_id raw3270_id[] = {
1308 { CCW_DEVICE(0x3270, 0) },
1309 { CCW_DEVICE(0x3271, 0) },
1310 { CCW_DEVICE(0x3272, 0) },
1311 { CCW_DEVICE(0x3273, 0) },
1312 { CCW_DEVICE(0x3274, 0) },
1313 { CCW_DEVICE(0x3275, 0) },
1314 { CCW_DEVICE(0x3276, 0) },
1315 { CCW_DEVICE(0x3277, 0) },
1316 { CCW_DEVICE(0x3278, 0) },
1317 { CCW_DEVICE(0x3279, 0) },
1318 { CCW_DEVICE(0x3174, 0) },
1319 { /* end of list */ },
1322 static struct ccw_driver raw3270_ccw_driver = {
1325 .owner = THIS_MODULE,
1328 .probe = &raw3270_probe,
1329 .remove = &raw3270_remove,
1330 .set_online = &raw3270_set_online,
1331 .set_offline = &raw3270_set_offline,
1332 .freeze = &raw3270_pm_stop,
1333 .thaw = &raw3270_pm_start,
1334 .restore = &raw3270_pm_start,
1335 .int_class = IRQIO_C70,
1344 if (raw3270_registered)
1346 raw3270_registered = 1;
1347 rc = ccw_driver_register(&raw3270_ccw_driver);
1349 /* Create attributes for early (= console) device. */
1350 mutex_lock(&raw3270_mutex);
1351 class3270 = class_create(THIS_MODULE, "3270");
1352 list_for_each_entry(rp, &raw3270_devices, list) {
1353 get_device(&rp->cdev->dev);
1354 raw3270_create_attributes(rp);
1356 mutex_unlock(&raw3270_mutex);
1364 ccw_driver_unregister(&raw3270_ccw_driver);
1365 class_destroy(class3270);
1368 MODULE_LICENSE("GPL");
1370 module_init(raw3270_init);
1371 module_exit(raw3270_exit);
1373 EXPORT_SYMBOL(class3270);
1374 EXPORT_SYMBOL(raw3270_request_alloc);
1375 EXPORT_SYMBOL(raw3270_request_free);
1376 EXPORT_SYMBOL(raw3270_request_reset);
1377 EXPORT_SYMBOL(raw3270_request_set_cmd);
1378 EXPORT_SYMBOL(raw3270_request_add_data);
1379 EXPORT_SYMBOL(raw3270_request_set_data);
1380 EXPORT_SYMBOL(raw3270_request_set_idal);
1381 EXPORT_SYMBOL(raw3270_buffer_address);
1382 EXPORT_SYMBOL(raw3270_add_view);
1383 EXPORT_SYMBOL(raw3270_del_view);
1384 EXPORT_SYMBOL(raw3270_find_view);
1385 EXPORT_SYMBOL(raw3270_activate_view);
1386 EXPORT_SYMBOL(raw3270_deactivate_view);
1387 EXPORT_SYMBOL(raw3270_start);
1388 EXPORT_SYMBOL(raw3270_start_locked);
1389 EXPORT_SYMBOL(raw3270_start_irq);
1390 EXPORT_SYMBOL(raw3270_reset);
1391 EXPORT_SYMBOL(raw3270_register_notifier);
1392 EXPORT_SYMBOL(raw3270_unregister_notifier);
1393 EXPORT_SYMBOL(raw3270_wait_queue);