This source file includes following definitions.
- gs_alloc_req
- gs_free_req
- gs_send_packet
- gs_start_tx
- gs_start_rx
- gs_rx_push
- gs_read_complete
- gs_write_complete
- gs_free_requests
- gs_alloc_requests
- gs_start_io
- gs_open
- gs_writes_finished
- gs_close
- gs_write
- gs_put_char
- gs_flush_chars
- gs_write_room
- gs_chars_in_buffer
- gs_unthrottle
- gs_break_ctl
- gs_request_new
- gs_request_free
- gs_complete_out
- gs_console_connect
- gs_console_disconnect
- gs_console_thread
- gs_console_setup
- gs_console_write
- gs_console_device
- gserial_console_init
- gserial_console_exit
- gs_console_connect
- gs_console_disconnect
- gserial_console_init
- gserial_console_exit
- gs_port_alloc
- gs_closed
- gserial_free_port
- gserial_free_line
- gserial_alloc_line
- gserial_connect
- gserial_disconnect
- userial_init
- userial_cleanup
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17 #include <linux/kernel.h>
18 #include <linux/sched.h>
19 #include <linux/device.h>
20 #include <linux/delay.h>
21 #include <linux/tty.h>
22 #include <linux/tty_flip.h>
23 #include <linux/slab.h>
24 #include <linux/export.h>
25 #include <linux/module.h>
26 #include <linux/console.h>
27 #include <linux/kthread.h>
28 #include <linux/workqueue.h>
29 #include <linux/kfifo.h>
30
31 #include "u_serial.h"
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80 #define QUEUE_SIZE 16
81 #define WRITE_BUF_SIZE 8192
82 #define GS_CONSOLE_BUF_SIZE 8192
83
84
85 struct gscons_info {
86 struct gs_port *port;
87 struct task_struct *console_thread;
88 struct kfifo con_buf;
89
90 spinlock_t con_lock;
91 int req_busy;
92 struct usb_request *console_req;
93 };
94
95
96
97
98
99 struct gs_port {
100 struct tty_port port;
101 spinlock_t port_lock;
102
103 struct gserial *port_usb;
104
105 bool openclose;
106 u8 port_num;
107
108 struct list_head read_pool;
109 int read_started;
110 int read_allocated;
111 struct list_head read_queue;
112 unsigned n_read;
113 struct delayed_work push;
114
115 struct list_head write_pool;
116 int write_started;
117 int write_allocated;
118 struct kfifo port_write_buf;
119 wait_queue_head_t drain_wait;
120 bool write_busy;
121 wait_queue_head_t close_wait;
122
123
124 struct usb_cdc_line_coding port_line_coding;
125 };
126
127 static struct portmaster {
128 struct mutex lock;
129 struct gs_port *port;
130 } ports[MAX_U_SERIAL_PORTS];
131
132 #define GS_CLOSE_TIMEOUT 15
133
134
135
136 #ifdef VERBOSE_DEBUG
137 #ifndef pr_vdebug
138 #define pr_vdebug(fmt, arg...) \
139 pr_debug(fmt, ##arg)
140 #endif
141 #else
142 #ifndef pr_vdebug
143 #define pr_vdebug(fmt, arg...) \
144 ({ if (0) pr_debug(fmt, ##arg); })
145 #endif
146 #endif
147
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156
157
158 struct usb_request *
159 gs_alloc_req(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
160 {
161 struct usb_request *req;
162
163 req = usb_ep_alloc_request(ep, kmalloc_flags);
164
165 if (req != NULL) {
166 req->length = len;
167 req->buf = kmalloc(len, kmalloc_flags);
168 if (req->buf == NULL) {
169 usb_ep_free_request(ep, req);
170 return NULL;
171 }
172 }
173
174 return req;
175 }
176 EXPORT_SYMBOL_GPL(gs_alloc_req);
177
178
179
180
181
182
183 void gs_free_req(struct usb_ep *ep, struct usb_request *req)
184 {
185 kfree(req->buf);
186 usb_ep_free_request(ep, req);
187 }
188 EXPORT_SYMBOL_GPL(gs_free_req);
189
190
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196
197
198
199 static unsigned
200 gs_send_packet(struct gs_port *port, char *packet, unsigned size)
201 {
202 unsigned len;
203
204 len = kfifo_len(&port->port_write_buf);
205 if (len < size)
206 size = len;
207 if (size != 0)
208 size = kfifo_out(&port->port_write_buf, packet, size);
209 return size;
210 }
211
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219
220
221
222
223 static int gs_start_tx(struct gs_port *port)
224
225
226
227
228 {
229 struct list_head *pool = &port->write_pool;
230 struct usb_ep *in;
231 int status = 0;
232 bool do_tty_wake = false;
233
234 if (!port->port_usb)
235 return status;
236
237 in = port->port_usb->in;
238
239 while (!port->write_busy && !list_empty(pool)) {
240 struct usb_request *req;
241 int len;
242
243 if (port->write_started >= QUEUE_SIZE)
244 break;
245
246 req = list_entry(pool->next, struct usb_request, list);
247 len = gs_send_packet(port, req->buf, in->maxpacket);
248 if (len == 0) {
249 wake_up_interruptible(&port->drain_wait);
250 break;
251 }
252 do_tty_wake = true;
253
254 req->length = len;
255 list_del(&req->list);
256 req->zero = kfifo_is_empty(&port->port_write_buf);
257
258 pr_vdebug("ttyGS%d: tx len=%d, 0x%02x 0x%02x 0x%02x ...\n",
259 port->port_num, len, *((u8 *)req->buf),
260 *((u8 *)req->buf+1), *((u8 *)req->buf+2));
261
262
263
264
265
266
267
268
269 port->write_busy = true;
270 spin_unlock(&port->port_lock);
271 status = usb_ep_queue(in, req, GFP_ATOMIC);
272 spin_lock(&port->port_lock);
273 port->write_busy = false;
274
275 if (status) {
276 pr_debug("%s: %s %s err %d\n",
277 __func__, "queue", in->name, status);
278 list_add(&req->list, pool);
279 break;
280 }
281
282 port->write_started++;
283
284
285 if (!port->port_usb)
286 break;
287 }
288
289 if (do_tty_wake && port->port.tty)
290 tty_wakeup(port->port.tty);
291 return status;
292 }
293
294
295
296
297 static unsigned gs_start_rx(struct gs_port *port)
298
299
300
301
302 {
303 struct list_head *pool = &port->read_pool;
304 struct usb_ep *out = port->port_usb->out;
305
306 while (!list_empty(pool)) {
307 struct usb_request *req;
308 int status;
309 struct tty_struct *tty;
310
311
312 tty = port->port.tty;
313 if (!tty)
314 break;
315
316 if (port->read_started >= QUEUE_SIZE)
317 break;
318
319 req = list_entry(pool->next, struct usb_request, list);
320 list_del(&req->list);
321 req->length = out->maxpacket;
322
323
324
325
326 spin_unlock(&port->port_lock);
327 status = usb_ep_queue(out, req, GFP_ATOMIC);
328 spin_lock(&port->port_lock);
329
330 if (status) {
331 pr_debug("%s: %s %s err %d\n",
332 __func__, "queue", out->name, status);
333 list_add(&req->list, pool);
334 break;
335 }
336 port->read_started++;
337
338
339 if (!port->port_usb)
340 break;
341 }
342 return port->read_started;
343 }
344
345
346
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349
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351
352
353
354
355 static void gs_rx_push(struct work_struct *work)
356 {
357 struct delayed_work *w = to_delayed_work(work);
358 struct gs_port *port = container_of(w, struct gs_port, push);
359 struct tty_struct *tty;
360 struct list_head *queue = &port->read_queue;
361 bool disconnect = false;
362 bool do_push = false;
363
364
365 spin_lock_irq(&port->port_lock);
366 tty = port->port.tty;
367 while (!list_empty(queue)) {
368 struct usb_request *req;
369
370 req = list_first_entry(queue, struct usb_request, list);
371
372
373 if (tty && tty_throttled(tty))
374 break;
375
376 switch (req->status) {
377 case -ESHUTDOWN:
378 disconnect = true;
379 pr_vdebug("ttyGS%d: shutdown\n", port->port_num);
380 break;
381
382 default:
383
384 pr_warn("ttyGS%d: unexpected RX status %d\n",
385 port->port_num, req->status);
386
387 case 0:
388
389 break;
390 }
391
392
393 if (req->actual && tty) {
394 char *packet = req->buf;
395 unsigned size = req->actual;
396 unsigned n;
397 int count;
398
399
400 n = port->n_read;
401 if (n) {
402 packet += n;
403 size -= n;
404 }
405
406 count = tty_insert_flip_string(&port->port, packet,
407 size);
408 if (count)
409 do_push = true;
410 if (count != size) {
411
412 port->n_read += count;
413 pr_vdebug("ttyGS%d: rx block %d/%d\n",
414 port->port_num, count, req->actual);
415 break;
416 }
417 port->n_read = 0;
418 }
419
420 list_move(&req->list, &port->read_pool);
421 port->read_started--;
422 }
423
424
425
426
427 if (do_push)
428 tty_flip_buffer_push(&port->port);
429
430
431
432
433
434
435
436
437
438 if (!list_empty(queue) && !tty_throttled(tty))
439 schedule_delayed_work(&port->push, 1);
440
441
442 if (!disconnect && port->port_usb)
443 gs_start_rx(port);
444
445 spin_unlock_irq(&port->port_lock);
446 }
447
448 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
449 {
450 struct gs_port *port = ep->driver_data;
451
452
453 spin_lock(&port->port_lock);
454 list_add_tail(&req->list, &port->read_queue);
455 schedule_delayed_work(&port->push, 0);
456 spin_unlock(&port->port_lock);
457 }
458
459 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
460 {
461 struct gs_port *port = ep->driver_data;
462
463 spin_lock(&port->port_lock);
464 list_add(&req->list, &port->write_pool);
465 port->write_started--;
466
467 switch (req->status) {
468 default:
469
470 pr_warn("%s: unexpected %s status %d\n",
471 __func__, ep->name, req->status);
472
473 case 0:
474
475 gs_start_tx(port);
476 break;
477
478 case -ESHUTDOWN:
479
480 pr_vdebug("%s: %s shutdown\n", __func__, ep->name);
481 break;
482 }
483
484 spin_unlock(&port->port_lock);
485 }
486
487 static void gs_free_requests(struct usb_ep *ep, struct list_head *head,
488 int *allocated)
489 {
490 struct usb_request *req;
491
492 while (!list_empty(head)) {
493 req = list_entry(head->next, struct usb_request, list);
494 list_del(&req->list);
495 gs_free_req(ep, req);
496 if (allocated)
497 (*allocated)--;
498 }
499 }
500
501 static int gs_alloc_requests(struct usb_ep *ep, struct list_head *head,
502 void (*fn)(struct usb_ep *, struct usb_request *),
503 int *allocated)
504 {
505 int i;
506 struct usb_request *req;
507 int n = allocated ? QUEUE_SIZE - *allocated : QUEUE_SIZE;
508
509
510
511
512
513 for (i = 0; i < n; i++) {
514 req = gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC);
515 if (!req)
516 return list_empty(head) ? -ENOMEM : 0;
517 req->complete = fn;
518 list_add_tail(&req->list, head);
519 if (allocated)
520 (*allocated)++;
521 }
522 return 0;
523 }
524
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527
528
529
530
531
532
533
534 static int gs_start_io(struct gs_port *port)
535 {
536 struct list_head *head = &port->read_pool;
537 struct usb_ep *ep = port->port_usb->out;
538 int status;
539 unsigned started;
540
541
542
543
544
545
546
547 status = gs_alloc_requests(ep, head, gs_read_complete,
548 &port->read_allocated);
549 if (status)
550 return status;
551
552 status = gs_alloc_requests(port->port_usb->in, &port->write_pool,
553 gs_write_complete, &port->write_allocated);
554 if (status) {
555 gs_free_requests(ep, head, &port->read_allocated);
556 return status;
557 }
558
559
560 port->n_read = 0;
561 started = gs_start_rx(port);
562
563 if (started) {
564 gs_start_tx(port);
565
566
567 tty_wakeup(port->port.tty);
568 } else {
569 gs_free_requests(ep, head, &port->read_allocated);
570 gs_free_requests(port->port_usb->in, &port->write_pool,
571 &port->write_allocated);
572 status = -EIO;
573 }
574
575 return status;
576 }
577
578
579
580
581
582
583
584
585
586
587 static int gs_open(struct tty_struct *tty, struct file *file)
588 {
589 int port_num = tty->index;
590 struct gs_port *port;
591 int status;
592
593 do {
594 mutex_lock(&ports[port_num].lock);
595 port = ports[port_num].port;
596 if (!port)
597 status = -ENODEV;
598 else {
599 spin_lock_irq(&port->port_lock);
600
601
602 if (port->port.count) {
603 status = 0;
604 port->port.count++;
605
606
607 } else if (port->openclose) {
608 status = -EBUSY;
609
610
611 } else {
612 status = -EAGAIN;
613 port->openclose = true;
614 }
615 spin_unlock_irq(&port->port_lock);
616 }
617 mutex_unlock(&ports[port_num].lock);
618
619 switch (status) {
620 default:
621
622 return status;
623 case -EAGAIN:
624
625 break;
626 case -EBUSY:
627
628 msleep(1);
629
630
631
632 break;
633 }
634 } while (status != -EAGAIN);
635
636
637 spin_lock_irq(&port->port_lock);
638
639
640 if (!kfifo_initialized(&port->port_write_buf)) {
641
642 spin_unlock_irq(&port->port_lock);
643 status = kfifo_alloc(&port->port_write_buf,
644 WRITE_BUF_SIZE, GFP_KERNEL);
645 spin_lock_irq(&port->port_lock);
646
647 if (status) {
648 pr_debug("gs_open: ttyGS%d (%p,%p) no buffer\n",
649 port->port_num, tty, file);
650 port->openclose = false;
651 goto exit_unlock_port;
652 }
653 }
654
655
656
657
658
659
660
661 tty->driver_data = port;
662 port->port.tty = tty;
663
664 port->port.count = 1;
665 port->openclose = false;
666
667
668 if (port->port_usb) {
669 struct gserial *gser = port->port_usb;
670
671 pr_debug("gs_open: start ttyGS%d\n", port->port_num);
672 gs_start_io(port);
673
674 if (gser->connect)
675 gser->connect(gser);
676 }
677
678 pr_debug("gs_open: ttyGS%d (%p,%p)\n", port->port_num, tty, file);
679
680 status = 0;
681
682 exit_unlock_port:
683 spin_unlock_irq(&port->port_lock);
684 return status;
685 }
686
687 static int gs_writes_finished(struct gs_port *p)
688 {
689 int cond;
690
691
692 spin_lock_irq(&p->port_lock);
693 cond = (p->port_usb == NULL) || !kfifo_len(&p->port_write_buf);
694 spin_unlock_irq(&p->port_lock);
695
696 return cond;
697 }
698
699 static void gs_close(struct tty_struct *tty, struct file *file)
700 {
701 struct gs_port *port = tty->driver_data;
702 struct gserial *gser;
703
704 spin_lock_irq(&port->port_lock);
705
706 if (port->port.count != 1) {
707 if (port->port.count == 0)
708 WARN_ON(1);
709 else
710 --port->port.count;
711 goto exit;
712 }
713
714 pr_debug("gs_close: ttyGS%d (%p,%p) ...\n", port->port_num, tty, file);
715
716
717
718
719 port->openclose = true;
720 port->port.count = 0;
721
722 gser = port->port_usb;
723 if (gser && gser->disconnect)
724 gser->disconnect(gser);
725
726
727
728
729 if (kfifo_len(&port->port_write_buf) > 0 && gser) {
730 spin_unlock_irq(&port->port_lock);
731 wait_event_interruptible_timeout(port->drain_wait,
732 gs_writes_finished(port),
733 GS_CLOSE_TIMEOUT * HZ);
734 spin_lock_irq(&port->port_lock);
735 gser = port->port_usb;
736 }
737
738
739
740
741
742 if (gser == NULL)
743 kfifo_free(&port->port_write_buf);
744 else
745 kfifo_reset(&port->port_write_buf);
746
747 port->port.tty = NULL;
748
749 port->openclose = false;
750
751 pr_debug("gs_close: ttyGS%d (%p,%p) done!\n",
752 port->port_num, tty, file);
753
754 wake_up(&port->close_wait);
755 exit:
756 spin_unlock_irq(&port->port_lock);
757 }
758
759 static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
760 {
761 struct gs_port *port = tty->driver_data;
762 unsigned long flags;
763
764 pr_vdebug("gs_write: ttyGS%d (%p) writing %d bytes\n",
765 port->port_num, tty, count);
766
767 spin_lock_irqsave(&port->port_lock, flags);
768 if (count)
769 count = kfifo_in(&port->port_write_buf, buf, count);
770
771 if (port->port_usb)
772 gs_start_tx(port);
773 spin_unlock_irqrestore(&port->port_lock, flags);
774
775 return count;
776 }
777
778 static int gs_put_char(struct tty_struct *tty, unsigned char ch)
779 {
780 struct gs_port *port = tty->driver_data;
781 unsigned long flags;
782 int status;
783
784 pr_vdebug("gs_put_char: (%d,%p) char=0x%x, called from %ps\n",
785 port->port_num, tty, ch, __builtin_return_address(0));
786
787 spin_lock_irqsave(&port->port_lock, flags);
788 status = kfifo_put(&port->port_write_buf, ch);
789 spin_unlock_irqrestore(&port->port_lock, flags);
790
791 return status;
792 }
793
794 static void gs_flush_chars(struct tty_struct *tty)
795 {
796 struct gs_port *port = tty->driver_data;
797 unsigned long flags;
798
799 pr_vdebug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);
800
801 spin_lock_irqsave(&port->port_lock, flags);
802 if (port->port_usb)
803 gs_start_tx(port);
804 spin_unlock_irqrestore(&port->port_lock, flags);
805 }
806
807 static int gs_write_room(struct tty_struct *tty)
808 {
809 struct gs_port *port = tty->driver_data;
810 unsigned long flags;
811 int room = 0;
812
813 spin_lock_irqsave(&port->port_lock, flags);
814 if (port->port_usb)
815 room = kfifo_avail(&port->port_write_buf);
816 spin_unlock_irqrestore(&port->port_lock, flags);
817
818 pr_vdebug("gs_write_room: (%d,%p) room=%d\n",
819 port->port_num, tty, room);
820
821 return room;
822 }
823
824 static int gs_chars_in_buffer(struct tty_struct *tty)
825 {
826 struct gs_port *port = tty->driver_data;
827 unsigned long flags;
828 int chars = 0;
829
830 spin_lock_irqsave(&port->port_lock, flags);
831 chars = kfifo_len(&port->port_write_buf);
832 spin_unlock_irqrestore(&port->port_lock, flags);
833
834 pr_vdebug("gs_chars_in_buffer: (%d,%p) chars=%d\n",
835 port->port_num, tty, chars);
836
837 return chars;
838 }
839
840
841 static void gs_unthrottle(struct tty_struct *tty)
842 {
843 struct gs_port *port = tty->driver_data;
844 unsigned long flags;
845
846 spin_lock_irqsave(&port->port_lock, flags);
847 if (port->port_usb) {
848
849
850
851
852 pr_vdebug("ttyGS%d: unthrottle\n", port->port_num);
853 schedule_delayed_work(&port->push, 0);
854 }
855 spin_unlock_irqrestore(&port->port_lock, flags);
856 }
857
858 static int gs_break_ctl(struct tty_struct *tty, int duration)
859 {
860 struct gs_port *port = tty->driver_data;
861 int status = 0;
862 struct gserial *gser;
863
864 pr_vdebug("gs_break_ctl: ttyGS%d, send break (%d) \n",
865 port->port_num, duration);
866
867 spin_lock_irq(&port->port_lock);
868 gser = port->port_usb;
869 if (gser && gser->send_break)
870 status = gser->send_break(gser, duration);
871 spin_unlock_irq(&port->port_lock);
872
873 return status;
874 }
875
876 static const struct tty_operations gs_tty_ops = {
877 .open = gs_open,
878 .close = gs_close,
879 .write = gs_write,
880 .put_char = gs_put_char,
881 .flush_chars = gs_flush_chars,
882 .write_room = gs_write_room,
883 .chars_in_buffer = gs_chars_in_buffer,
884 .unthrottle = gs_unthrottle,
885 .break_ctl = gs_break_ctl,
886 };
887
888
889
890 static struct tty_driver *gs_tty_driver;
891
892 #ifdef CONFIG_U_SERIAL_CONSOLE
893
894 static struct gscons_info gscons_info;
895 static struct console gserial_cons;
896
897 static struct usb_request *gs_request_new(struct usb_ep *ep)
898 {
899 struct usb_request *req = usb_ep_alloc_request(ep, GFP_ATOMIC);
900 if (!req)
901 return NULL;
902
903 req->buf = kmalloc(ep->maxpacket, GFP_ATOMIC);
904 if (!req->buf) {
905 usb_ep_free_request(ep, req);
906 return NULL;
907 }
908
909 return req;
910 }
911
912 static void gs_request_free(struct usb_request *req, struct usb_ep *ep)
913 {
914 if (!req)
915 return;
916
917 kfree(req->buf);
918 usb_ep_free_request(ep, req);
919 }
920
921 static void gs_complete_out(struct usb_ep *ep, struct usb_request *req)
922 {
923 struct gscons_info *info = &gscons_info;
924
925 switch (req->status) {
926 default:
927 pr_warn("%s: unexpected %s status %d\n",
928 __func__, ep->name, req->status);
929
930 case 0:
931
932 spin_lock(&info->con_lock);
933 info->req_busy = 0;
934 spin_unlock(&info->con_lock);
935
936 wake_up_process(info->console_thread);
937 break;
938 case -ESHUTDOWN:
939
940 pr_vdebug("%s: %s shutdown\n", __func__, ep->name);
941 break;
942 }
943 }
944
945 static int gs_console_connect(int port_num)
946 {
947 struct gscons_info *info = &gscons_info;
948 struct gs_port *port;
949 struct usb_ep *ep;
950
951 if (port_num != gserial_cons.index) {
952 pr_err("%s: port num [%d] is not support console\n",
953 __func__, port_num);
954 return -ENXIO;
955 }
956
957 port = ports[port_num].port;
958 ep = port->port_usb->in;
959 if (!info->console_req) {
960 info->console_req = gs_request_new(ep);
961 if (!info->console_req)
962 return -ENOMEM;
963 info->console_req->complete = gs_complete_out;
964 }
965
966 info->port = port;
967 spin_lock(&info->con_lock);
968 info->req_busy = 0;
969 spin_unlock(&info->con_lock);
970 pr_vdebug("port[%d] console connect!\n", port_num);
971 return 0;
972 }
973
974 static void gs_console_disconnect(struct usb_ep *ep)
975 {
976 struct gscons_info *info = &gscons_info;
977 struct usb_request *req = info->console_req;
978
979 gs_request_free(req, ep);
980 info->console_req = NULL;
981 }
982
983 static int gs_console_thread(void *data)
984 {
985 struct gscons_info *info = &gscons_info;
986 struct gs_port *port;
987 struct usb_request *req;
988 struct usb_ep *ep;
989 int xfer, ret, count, size;
990
991 do {
992 port = info->port;
993 set_current_state(TASK_INTERRUPTIBLE);
994 if (!port || !port->port_usb
995 || !port->port_usb->in || !info->console_req)
996 goto sched;
997
998 req = info->console_req;
999 ep = port->port_usb->in;
1000
1001 spin_lock_irq(&info->con_lock);
1002 count = kfifo_len(&info->con_buf);
1003 size = ep->maxpacket;
1004
1005 if (count > 0 && !info->req_busy) {
1006 set_current_state(TASK_RUNNING);
1007 if (count < size)
1008 size = count;
1009
1010 xfer = kfifo_out(&info->con_buf, req->buf, size);
1011 req->length = xfer;
1012
1013 spin_unlock(&info->con_lock);
1014 ret = usb_ep_queue(ep, req, GFP_ATOMIC);
1015 spin_lock(&info->con_lock);
1016 if (ret < 0)
1017 info->req_busy = 0;
1018 else
1019 info->req_busy = 1;
1020
1021 spin_unlock_irq(&info->con_lock);
1022 } else {
1023 spin_unlock_irq(&info->con_lock);
1024 sched:
1025 if (kthread_should_stop()) {
1026 set_current_state(TASK_RUNNING);
1027 break;
1028 }
1029 schedule();
1030 }
1031 } while (1);
1032
1033 return 0;
1034 }
1035
1036 static int gs_console_setup(struct console *co, char *options)
1037 {
1038 struct gscons_info *info = &gscons_info;
1039 int status;
1040
1041 info->port = NULL;
1042 info->console_req = NULL;
1043 info->req_busy = 0;
1044 spin_lock_init(&info->con_lock);
1045
1046 status = kfifo_alloc(&info->con_buf, GS_CONSOLE_BUF_SIZE, GFP_KERNEL);
1047 if (status) {
1048 pr_err("%s: allocate console buffer failed\n", __func__);
1049 return status;
1050 }
1051
1052 info->console_thread = kthread_create(gs_console_thread,
1053 co, "gs_console");
1054 if (IS_ERR(info->console_thread)) {
1055 pr_err("%s: cannot create console thread\n", __func__);
1056 kfifo_free(&info->con_buf);
1057 return PTR_ERR(info->console_thread);
1058 }
1059 wake_up_process(info->console_thread);
1060
1061 return 0;
1062 }
1063
1064 static void gs_console_write(struct console *co,
1065 const char *buf, unsigned count)
1066 {
1067 struct gscons_info *info = &gscons_info;
1068 unsigned long flags;
1069
1070 spin_lock_irqsave(&info->con_lock, flags);
1071 kfifo_in(&info->con_buf, buf, count);
1072 spin_unlock_irqrestore(&info->con_lock, flags);
1073
1074 wake_up_process(info->console_thread);
1075 }
1076
1077 static struct tty_driver *gs_console_device(struct console *co, int *index)
1078 {
1079 struct tty_driver **p = (struct tty_driver **)co->data;
1080
1081 if (!*p)
1082 return NULL;
1083
1084 *index = co->index;
1085 return *p;
1086 }
1087
1088 static struct console gserial_cons = {
1089 .name = "ttyGS",
1090 .write = gs_console_write,
1091 .device = gs_console_device,
1092 .setup = gs_console_setup,
1093 .flags = CON_PRINTBUFFER,
1094 .index = -1,
1095 .data = &gs_tty_driver,
1096 };
1097
1098 static void gserial_console_init(void)
1099 {
1100 register_console(&gserial_cons);
1101 }
1102
1103 static void gserial_console_exit(void)
1104 {
1105 struct gscons_info *info = &gscons_info;
1106
1107 unregister_console(&gserial_cons);
1108 if (!IS_ERR_OR_NULL(info->console_thread))
1109 kthread_stop(info->console_thread);
1110 kfifo_free(&info->con_buf);
1111 }
1112
1113 #else
1114
1115 static int gs_console_connect(int port_num)
1116 {
1117 return 0;
1118 }
1119
1120 static void gs_console_disconnect(struct usb_ep *ep)
1121 {
1122 }
1123
1124 static void gserial_console_init(void)
1125 {
1126 }
1127
1128 static void gserial_console_exit(void)
1129 {
1130 }
1131
1132 #endif
1133
1134 static int
1135 gs_port_alloc(unsigned port_num, struct usb_cdc_line_coding *coding)
1136 {
1137 struct gs_port *port;
1138 int ret = 0;
1139
1140 mutex_lock(&ports[port_num].lock);
1141 if (ports[port_num].port) {
1142 ret = -EBUSY;
1143 goto out;
1144 }
1145
1146 port = kzalloc(sizeof(struct gs_port), GFP_KERNEL);
1147 if (port == NULL) {
1148 ret = -ENOMEM;
1149 goto out;
1150 }
1151
1152 tty_port_init(&port->port);
1153 spin_lock_init(&port->port_lock);
1154 init_waitqueue_head(&port->drain_wait);
1155 init_waitqueue_head(&port->close_wait);
1156
1157 INIT_DELAYED_WORK(&port->push, gs_rx_push);
1158
1159 INIT_LIST_HEAD(&port->read_pool);
1160 INIT_LIST_HEAD(&port->read_queue);
1161 INIT_LIST_HEAD(&port->write_pool);
1162
1163 port->port_num = port_num;
1164 port->port_line_coding = *coding;
1165
1166 ports[port_num].port = port;
1167 out:
1168 mutex_unlock(&ports[port_num].lock);
1169 return ret;
1170 }
1171
1172 static int gs_closed(struct gs_port *port)
1173 {
1174 int cond;
1175
1176 spin_lock_irq(&port->port_lock);
1177 cond = (port->port.count == 0) && !port->openclose;
1178 spin_unlock_irq(&port->port_lock);
1179 return cond;
1180 }
1181
1182 static void gserial_free_port(struct gs_port *port)
1183 {
1184 cancel_delayed_work_sync(&port->push);
1185
1186 wait_event(port->close_wait, gs_closed(port));
1187 WARN_ON(port->port_usb != NULL);
1188 tty_port_destroy(&port->port);
1189 kfree(port);
1190 }
1191
1192 void gserial_free_line(unsigned char port_num)
1193 {
1194 struct gs_port *port;
1195
1196 mutex_lock(&ports[port_num].lock);
1197 if (WARN_ON(!ports[port_num].port)) {
1198 mutex_unlock(&ports[port_num].lock);
1199 return;
1200 }
1201 port = ports[port_num].port;
1202 ports[port_num].port = NULL;
1203 mutex_unlock(&ports[port_num].lock);
1204
1205 gserial_free_port(port);
1206 tty_unregister_device(gs_tty_driver, port_num);
1207 gserial_console_exit();
1208 }
1209 EXPORT_SYMBOL_GPL(gserial_free_line);
1210
1211 int gserial_alloc_line(unsigned char *line_num)
1212 {
1213 struct usb_cdc_line_coding coding;
1214 struct device *tty_dev;
1215 int ret;
1216 int port_num;
1217
1218 coding.dwDTERate = cpu_to_le32(9600);
1219 coding.bCharFormat = 8;
1220 coding.bParityType = USB_CDC_NO_PARITY;
1221 coding.bDataBits = USB_CDC_1_STOP_BITS;
1222
1223 for (port_num = 0; port_num < MAX_U_SERIAL_PORTS; port_num++) {
1224 ret = gs_port_alloc(port_num, &coding);
1225 if (ret == -EBUSY)
1226 continue;
1227 if (ret)
1228 return ret;
1229 break;
1230 }
1231 if (ret)
1232 return ret;
1233
1234
1235
1236 tty_dev = tty_port_register_device(&ports[port_num].port->port,
1237 gs_tty_driver, port_num, NULL);
1238 if (IS_ERR(tty_dev)) {
1239 struct gs_port *port;
1240 pr_err("%s: failed to register tty for port %d, err %ld\n",
1241 __func__, port_num, PTR_ERR(tty_dev));
1242
1243 ret = PTR_ERR(tty_dev);
1244 mutex_lock(&ports[port_num].lock);
1245 port = ports[port_num].port;
1246 ports[port_num].port = NULL;
1247 mutex_unlock(&ports[port_num].lock);
1248 gserial_free_port(port);
1249 goto err;
1250 }
1251 *line_num = port_num;
1252 gserial_console_init();
1253 err:
1254 return ret;
1255 }
1256 EXPORT_SYMBOL_GPL(gserial_alloc_line);
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279 int gserial_connect(struct gserial *gser, u8 port_num)
1280 {
1281 struct gs_port *port;
1282 unsigned long flags;
1283 int status;
1284
1285 if (port_num >= MAX_U_SERIAL_PORTS)
1286 return -ENXIO;
1287
1288 port = ports[port_num].port;
1289 if (!port) {
1290 pr_err("serial line %d not allocated.\n", port_num);
1291 return -EINVAL;
1292 }
1293 if (port->port_usb) {
1294 pr_err("serial line %d is in use.\n", port_num);
1295 return -EBUSY;
1296 }
1297
1298
1299 status = usb_ep_enable(gser->in);
1300 if (status < 0)
1301 return status;
1302 gser->in->driver_data = port;
1303
1304 status = usb_ep_enable(gser->out);
1305 if (status < 0)
1306 goto fail_out;
1307 gser->out->driver_data = port;
1308
1309
1310 spin_lock_irqsave(&port->port_lock, flags);
1311 gser->ioport = port;
1312 port->port_usb = gser;
1313
1314
1315
1316
1317 gser->port_line_coding = port->port_line_coding;
1318
1319
1320
1321
1322
1323
1324 if (port->port.count) {
1325 pr_debug("gserial_connect: start ttyGS%d\n", port->port_num);
1326 gs_start_io(port);
1327 if (gser->connect)
1328 gser->connect(gser);
1329 } else {
1330 if (gser->disconnect)
1331 gser->disconnect(gser);
1332 }
1333
1334 status = gs_console_connect(port_num);
1335 spin_unlock_irqrestore(&port->port_lock, flags);
1336
1337 return status;
1338
1339 fail_out:
1340 usb_ep_disable(gser->in);
1341 return status;
1342 }
1343 EXPORT_SYMBOL_GPL(gserial_connect);
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355 void gserial_disconnect(struct gserial *gser)
1356 {
1357 struct gs_port *port = gser->ioport;
1358 unsigned long flags;
1359
1360 if (!port)
1361 return;
1362
1363
1364 spin_lock_irqsave(&port->port_lock, flags);
1365
1366
1367 port->port_line_coding = gser->port_line_coding;
1368
1369 port->port_usb = NULL;
1370 gser->ioport = NULL;
1371 if (port->port.count > 0 || port->openclose) {
1372 wake_up_interruptible(&port->drain_wait);
1373 if (port->port.tty)
1374 tty_hangup(port->port.tty);
1375 }
1376 spin_unlock_irqrestore(&port->port_lock, flags);
1377
1378
1379 usb_ep_disable(gser->out);
1380 usb_ep_disable(gser->in);
1381
1382
1383 spin_lock_irqsave(&port->port_lock, flags);
1384 if (port->port.count == 0 && !port->openclose)
1385 kfifo_free(&port->port_write_buf);
1386 gs_free_requests(gser->out, &port->read_pool, NULL);
1387 gs_free_requests(gser->out, &port->read_queue, NULL);
1388 gs_free_requests(gser->in, &port->write_pool, NULL);
1389
1390 port->read_allocated = port->read_started =
1391 port->write_allocated = port->write_started = 0;
1392
1393 gs_console_disconnect(gser->in);
1394 spin_unlock_irqrestore(&port->port_lock, flags);
1395 }
1396 EXPORT_SYMBOL_GPL(gserial_disconnect);
1397
1398 static int userial_init(void)
1399 {
1400 unsigned i;
1401 int status;
1402
1403 gs_tty_driver = alloc_tty_driver(MAX_U_SERIAL_PORTS);
1404 if (!gs_tty_driver)
1405 return -ENOMEM;
1406
1407 gs_tty_driver->driver_name = "g_serial";
1408 gs_tty_driver->name = "ttyGS";
1409
1410
1411 gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
1412 gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
1413 gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1414 gs_tty_driver->init_termios = tty_std_termios;
1415
1416
1417
1418
1419
1420 gs_tty_driver->init_termios.c_cflag =
1421 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1422 gs_tty_driver->init_termios.c_ispeed = 9600;
1423 gs_tty_driver->init_termios.c_ospeed = 9600;
1424
1425 tty_set_operations(gs_tty_driver, &gs_tty_ops);
1426 for (i = 0; i < MAX_U_SERIAL_PORTS; i++)
1427 mutex_init(&ports[i].lock);
1428
1429
1430 status = tty_register_driver(gs_tty_driver);
1431 if (status) {
1432 pr_err("%s: cannot register, err %d\n",
1433 __func__, status);
1434 goto fail;
1435 }
1436
1437 pr_debug("%s: registered %d ttyGS* device%s\n", __func__,
1438 MAX_U_SERIAL_PORTS,
1439 (MAX_U_SERIAL_PORTS == 1) ? "" : "s");
1440
1441 return status;
1442 fail:
1443 put_tty_driver(gs_tty_driver);
1444 gs_tty_driver = NULL;
1445 return status;
1446 }
1447 module_init(userial_init);
1448
1449 static void userial_cleanup(void)
1450 {
1451 tty_unregister_driver(gs_tty_driver);
1452 put_tty_driver(gs_tty_driver);
1453 gs_tty_driver = NULL;
1454 }
1455 module_exit(userial_cleanup);
1456
1457 MODULE_LICENSE("GPL");