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23#include <linux/module.h>
24
25#include <linux/kernel.h>
26#include <linux/init.h>
27#include <linux/slab.h>
28#include <linux/types.h>
29#include <linux/delay.h>
30#include <linux/errno.h>
31#include <linux/ptrace.h>
32#include <linux/ioport.h>
33#include <linux/spinlock.h>
34#include <linux/moduleparam.h>
35
36#include <linux/skbuff.h>
37#include <linux/string.h>
38#include <linux/serial.h>
39#include <linux/serial_reg.h>
40#include <linux/bitops.h>
41#include <asm/system.h>
42#include <asm/io.h>
43
44#include <pcmcia/cs_types.h>
45#include <pcmcia/cs.h>
46#include <pcmcia/cistpl.h>
47#include <pcmcia/ciscode.h>
48#include <pcmcia/ds.h>
49#include <pcmcia/cisreg.h>
50
51#include <net/bluetooth/bluetooth.h>
52#include <net/bluetooth/hci_core.h>
53
54
55
56
57
58
59MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
60MODULE_DESCRIPTION("Bluetooth driver for Bluetooth PCMCIA cards with HCI UART interface");
61MODULE_LICENSE("GPL");
62
63
64
65
66
67
68typedef struct btuart_info_t {
69 struct pcmcia_device *p_dev;
70 dev_node_t node;
71
72 struct hci_dev *hdev;
73
74 spinlock_t lock;
75
76 struct sk_buff_head txq;
77 unsigned long tx_state;
78
79 unsigned long rx_state;
80 unsigned long rx_count;
81 struct sk_buff *rx_skb;
82} btuart_info_t;
83
84
85static int btuart_config(struct pcmcia_device *link);
86static void btuart_release(struct pcmcia_device *link);
87
88static void btuart_detach(struct pcmcia_device *p_dev);
89
90
91
92#define SPEED_MAX 115200
93
94
95#define DEFAULT_BAUD_RATE 115200
96
97
98
99#define XMIT_SENDING 1
100#define XMIT_WAKEUP 2
101#define XMIT_WAITING 8
102
103
104#define RECV_WAIT_PACKET_TYPE 0
105#define RECV_WAIT_EVENT_HEADER 1
106#define RECV_WAIT_ACL_HEADER 2
107#define RECV_WAIT_SCO_HEADER 3
108#define RECV_WAIT_DATA 4
109
110
111
112
113
114
115static int btuart_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
116{
117 int actual = 0;
118
119
120 if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
121 return 0;
122
123
124 while ((fifo_size-- > 0) && (actual < len)) {
125
126 outb(buf[actual], iobase + UART_TX);
127 actual++;
128 }
129
130 return actual;
131}
132
133
134static void btuart_write_wakeup(btuart_info_t *info)
135{
136 if (!info) {
137 BT_ERR("Unknown device");
138 return;
139 }
140
141 if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
142 set_bit(XMIT_WAKEUP, &(info->tx_state));
143 return;
144 }
145
146 do {
147 register unsigned int iobase = info->p_dev->io.BasePort1;
148 register struct sk_buff *skb;
149 register int len;
150
151 clear_bit(XMIT_WAKEUP, &(info->tx_state));
152
153 if (!pcmcia_dev_present(info->p_dev))
154 return;
155
156 if (!(skb = skb_dequeue(&(info->txq))))
157 break;
158
159
160 len = btuart_write(iobase, 16, skb->data, skb->len);
161 set_bit(XMIT_WAKEUP, &(info->tx_state));
162
163 if (len == skb->len) {
164 kfree_skb(skb);
165 } else {
166 skb_pull(skb, len);
167 skb_queue_head(&(info->txq), skb);
168 }
169
170 info->hdev->stat.byte_tx += len;
171
172 } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
173
174 clear_bit(XMIT_SENDING, &(info->tx_state));
175}
176
177
178static void btuart_receive(btuart_info_t *info)
179{
180 unsigned int iobase;
181 int boguscount = 0;
182
183 if (!info) {
184 BT_ERR("Unknown device");
185 return;
186 }
187
188 iobase = info->p_dev->io.BasePort1;
189
190 do {
191 info->hdev->stat.byte_rx++;
192
193
194 if (info->rx_skb == NULL) {
195 info->rx_state = RECV_WAIT_PACKET_TYPE;
196 info->rx_count = 0;
197 if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
198 BT_ERR("Can't allocate mem for new packet");
199 return;
200 }
201 }
202
203 if (info->rx_state == RECV_WAIT_PACKET_TYPE) {
204
205 info->rx_skb->dev = (void *) info->hdev;
206 bt_cb(info->rx_skb)->pkt_type = inb(iobase + UART_RX);
207
208 switch (bt_cb(info->rx_skb)->pkt_type) {
209
210 case HCI_EVENT_PKT:
211 info->rx_state = RECV_WAIT_EVENT_HEADER;
212 info->rx_count = HCI_EVENT_HDR_SIZE;
213 break;
214
215 case HCI_ACLDATA_PKT:
216 info->rx_state = RECV_WAIT_ACL_HEADER;
217 info->rx_count = HCI_ACL_HDR_SIZE;
218 break;
219
220 case HCI_SCODATA_PKT:
221 info->rx_state = RECV_WAIT_SCO_HEADER;
222 info->rx_count = HCI_SCO_HDR_SIZE;
223 break;
224
225 default:
226
227 BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
228 info->hdev->stat.err_rx++;
229 clear_bit(HCI_RUNNING, &(info->hdev->flags));
230
231 kfree_skb(info->rx_skb);
232 info->rx_skb = NULL;
233 break;
234
235 }
236
237 } else {
238
239 *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
240 info->rx_count--;
241
242 if (info->rx_count == 0) {
243
244 int dlen;
245 struct hci_event_hdr *eh;
246 struct hci_acl_hdr *ah;
247 struct hci_sco_hdr *sh;
248
249
250 switch (info->rx_state) {
251
252 case RECV_WAIT_EVENT_HEADER:
253 eh = hci_event_hdr(info->rx_skb);
254 info->rx_state = RECV_WAIT_DATA;
255 info->rx_count = eh->plen;
256 break;
257
258 case RECV_WAIT_ACL_HEADER:
259 ah = hci_acl_hdr(info->rx_skb);
260 dlen = __le16_to_cpu(ah->dlen);
261 info->rx_state = RECV_WAIT_DATA;
262 info->rx_count = dlen;
263 break;
264
265 case RECV_WAIT_SCO_HEADER:
266 sh = hci_sco_hdr(info->rx_skb);
267 info->rx_state = RECV_WAIT_DATA;
268 info->rx_count = sh->dlen;
269 break;
270
271 case RECV_WAIT_DATA:
272 hci_recv_frame(info->rx_skb);
273 info->rx_skb = NULL;
274 break;
275
276 }
277
278 }
279
280 }
281
282
283 if (boguscount++ > 16)
284 break;
285
286 } while (inb(iobase + UART_LSR) & UART_LSR_DR);
287}
288
289
290static irqreturn_t btuart_interrupt(int irq, void *dev_inst)
291{
292 btuart_info_t *info = dev_inst;
293 unsigned int iobase;
294 int boguscount = 0;
295 int iir, lsr;
296 irqreturn_t r = IRQ_NONE;
297
298 BUG_ON(!info->hdev);
299
300 iobase = info->p_dev->io.BasePort1;
301
302 spin_lock(&(info->lock));
303
304 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
305 while (iir) {
306 r = IRQ_HANDLED;
307
308
309 lsr = inb(iobase + UART_LSR);
310
311 switch (iir) {
312 case UART_IIR_RLSI:
313 BT_ERR("RLSI");
314 break;
315 case UART_IIR_RDI:
316
317 btuart_receive(info);
318 break;
319 case UART_IIR_THRI:
320 if (lsr & UART_LSR_THRE) {
321
322 btuart_write_wakeup(info);
323 }
324 break;
325 default:
326 BT_ERR("Unhandled IIR=%#x", iir);
327 break;
328 }
329
330
331 if (boguscount++ > 100)
332 break;
333
334 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
335
336 }
337
338 spin_unlock(&(info->lock));
339
340 return r;
341}
342
343
344static void btuart_change_speed(btuart_info_t *info, unsigned int speed)
345{
346 unsigned long flags;
347 unsigned int iobase;
348 int fcr;
349 int lcr;
350 int divisor;
351
352 if (!info) {
353 BT_ERR("Unknown device");
354 return;
355 }
356
357 iobase = info->p_dev->io.BasePort1;
358
359 spin_lock_irqsave(&(info->lock), flags);
360
361
362 outb(0, iobase + UART_IER);
363
364 divisor = SPEED_MAX / speed;
365
366 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT;
367
368
369
370
371
372
373
374 if (speed < 38400)
375 fcr |= UART_FCR_TRIGGER_1;
376 else
377 fcr |= UART_FCR_TRIGGER_14;
378
379
380 lcr = UART_LCR_WLEN8;
381
382 outb(UART_LCR_DLAB | lcr, iobase + UART_LCR);
383 outb(divisor & 0xff, iobase + UART_DLL);
384 outb(divisor >> 8, iobase + UART_DLM);
385 outb(lcr, iobase + UART_LCR);
386 outb(fcr, iobase + UART_FCR);
387
388
389 outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
390
391 spin_unlock_irqrestore(&(info->lock), flags);
392}
393
394
395
396
397
398
399static int btuart_hci_flush(struct hci_dev *hdev)
400{
401 btuart_info_t *info = (btuart_info_t *)(hdev->driver_data);
402
403
404 skb_queue_purge(&(info->txq));
405
406 return 0;
407}
408
409
410static int btuart_hci_open(struct hci_dev *hdev)
411{
412 set_bit(HCI_RUNNING, &(hdev->flags));
413
414 return 0;
415}
416
417
418static int btuart_hci_close(struct hci_dev *hdev)
419{
420 if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
421 return 0;
422
423 btuart_hci_flush(hdev);
424
425 return 0;
426}
427
428
429static int btuart_hci_send_frame(struct sk_buff *skb)
430{
431 btuart_info_t *info;
432 struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
433
434 if (!hdev) {
435 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
436 return -ENODEV;
437 }
438
439 info = (btuart_info_t *)(hdev->driver_data);
440
441 switch (bt_cb(skb)->pkt_type) {
442 case HCI_COMMAND_PKT:
443 hdev->stat.cmd_tx++;
444 break;
445 case HCI_ACLDATA_PKT:
446 hdev->stat.acl_tx++;
447 break;
448 case HCI_SCODATA_PKT:
449 hdev->stat.sco_tx++;
450 break;
451 };
452
453
454 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
455 skb_queue_tail(&(info->txq), skb);
456
457 btuart_write_wakeup(info);
458
459 return 0;
460}
461
462
463static void btuart_hci_destruct(struct hci_dev *hdev)
464{
465}
466
467
468static int btuart_hci_ioctl(struct hci_dev *hdev, unsigned int cmd, unsigned long arg)
469{
470 return -ENOIOCTLCMD;
471}
472
473
474
475
476
477
478static int btuart_open(btuart_info_t *info)
479{
480 unsigned long flags;
481 unsigned int iobase = info->p_dev->io.BasePort1;
482 struct hci_dev *hdev;
483
484 spin_lock_init(&(info->lock));
485
486 skb_queue_head_init(&(info->txq));
487
488 info->rx_state = RECV_WAIT_PACKET_TYPE;
489 info->rx_count = 0;
490 info->rx_skb = NULL;
491
492
493 hdev = hci_alloc_dev();
494 if (!hdev) {
495 BT_ERR("Can't allocate HCI device");
496 return -ENOMEM;
497 }
498
499 info->hdev = hdev;
500
501 hdev->type = HCI_PCCARD;
502 hdev->driver_data = info;
503 SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
504
505 hdev->open = btuart_hci_open;
506 hdev->close = btuart_hci_close;
507 hdev->flush = btuart_hci_flush;
508 hdev->send = btuart_hci_send_frame;
509 hdev->destruct = btuart_hci_destruct;
510 hdev->ioctl = btuart_hci_ioctl;
511
512 hdev->owner = THIS_MODULE;
513
514 spin_lock_irqsave(&(info->lock), flags);
515
516
517 outb(0, iobase + UART_MCR);
518
519
520 outb(0, iobase + UART_IER);
521
522
523 outb(UART_LCR_WLEN8, iobase + UART_LCR);
524 outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
525
526
527
528
529 spin_unlock_irqrestore(&(info->lock), flags);
530
531 btuart_change_speed(info, DEFAULT_BAUD_RATE);
532
533
534 msleep(1000);
535
536
537 if (hci_register_dev(hdev) < 0) {
538 BT_ERR("Can't register HCI device");
539 info->hdev = NULL;
540 hci_free_dev(hdev);
541 return -ENODEV;
542 }
543
544 return 0;
545}
546
547
548static int btuart_close(btuart_info_t *info)
549{
550 unsigned long flags;
551 unsigned int iobase = info->p_dev->io.BasePort1;
552 struct hci_dev *hdev = info->hdev;
553
554 if (!hdev)
555 return -ENODEV;
556
557 btuart_hci_close(hdev);
558
559 spin_lock_irqsave(&(info->lock), flags);
560
561
562 outb(0, iobase + UART_MCR);
563
564
565 outb(0, iobase + UART_IER);
566
567 spin_unlock_irqrestore(&(info->lock), flags);
568
569 if (hci_unregister_dev(hdev) < 0)
570 BT_ERR("Can't unregister HCI device %s", hdev->name);
571
572 hci_free_dev(hdev);
573
574 return 0;
575}
576
577static int btuart_probe(struct pcmcia_device *link)
578{
579 btuart_info_t *info;
580
581
582 info = kzalloc(sizeof(*info), GFP_KERNEL);
583 if (!info)
584 return -ENOMEM;
585
586 info->p_dev = link;
587 link->priv = info;
588
589 link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
590 link->io.NumPorts1 = 8;
591 link->irq.Attributes = IRQ_TYPE_DYNAMIC_SHARING | IRQ_HANDLE_PRESENT;
592 link->irq.IRQInfo1 = IRQ_LEVEL_ID;
593
594 link->irq.Handler = btuart_interrupt;
595 link->irq.Instance = info;
596
597 link->conf.Attributes = CONF_ENABLE_IRQ;
598 link->conf.IntType = INT_MEMORY_AND_IO;
599
600 return btuart_config(link);
601}
602
603
604static void btuart_detach(struct pcmcia_device *link)
605{
606 btuart_info_t *info = link->priv;
607
608 btuart_release(link);
609 kfree(info);
610}
611
612static int btuart_check_config(struct pcmcia_device *p_dev,
613 cistpl_cftable_entry_t *cf,
614 cistpl_cftable_entry_t *dflt,
615 unsigned int vcc,
616 void *priv_data)
617{
618 int *try = priv_data;
619
620 if (cf->vpp1.present & (1 << CISTPL_POWER_VNOM))
621 p_dev->conf.Vpp = cf->vpp1.param[CISTPL_POWER_VNOM] / 10000;
622 if ((cf->io.nwin > 0) && (cf->io.win[0].len == 8) &&
623 (cf->io.win[0].base != 0)) {
624 p_dev->io.BasePort1 = cf->io.win[0].base;
625 p_dev->io.IOAddrLines = (*try == 0) ? 16 :
626 cf->io.flags & CISTPL_IO_LINES_MASK;
627 if (!pcmcia_request_io(p_dev, &p_dev->io))
628 return 0;
629 }
630 return -ENODEV;
631}
632
633static int btuart_check_config_notpicky(struct pcmcia_device *p_dev,
634 cistpl_cftable_entry_t *cf,
635 cistpl_cftable_entry_t *dflt,
636 unsigned int vcc,
637 void *priv_data)
638{
639 static unsigned int base[5] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x0 };
640 int j;
641
642 if ((cf->io.nwin > 0) && ((cf->io.flags & CISTPL_IO_LINES_MASK) <= 3)) {
643 for (j = 0; j < 5; j++) {
644 p_dev->io.BasePort1 = base[j];
645 p_dev->io.IOAddrLines = base[j] ? 16 : 3;
646 if (!pcmcia_request_io(p_dev, &p_dev->io))
647 return 0;
648 }
649 }
650 return -ENODEV;
651}
652
653static int btuart_config(struct pcmcia_device *link)
654{
655 btuart_info_t *info = link->priv;
656 int i;
657 int try;
658
659
660
661 for (try = 0; try < 2; try++)
662 if (!pcmcia_loop_config(link, btuart_check_config, &try))
663 goto found_port;
664
665
666
667
668 if (!pcmcia_loop_config(link, btuart_check_config_notpicky, NULL))
669 goto found_port;
670
671 BT_ERR("No usable port range found");
672 cs_error(link, RequestIO, -ENODEV);
673 goto failed;
674
675found_port:
676 i = pcmcia_request_irq(link, &link->irq);
677 if (i != 0) {
678 cs_error(link, RequestIRQ, i);
679 link->irq.AssignedIRQ = 0;
680 }
681
682 i = pcmcia_request_configuration(link, &link->conf);
683 if (i != 0) {
684 cs_error(link, RequestConfiguration, i);
685 goto failed;
686 }
687
688 if (btuart_open(info) != 0)
689 goto failed;
690
691 strcpy(info->node.dev_name, info->hdev->name);
692 link->dev_node = &info->node;
693
694 return 0;
695
696failed:
697 btuart_release(link);
698 return -ENODEV;
699}
700
701
702static void btuart_release(struct pcmcia_device *link)
703{
704 btuart_info_t *info = link->priv;
705
706 btuart_close(info);
707
708 pcmcia_disable_device(link);
709}
710
711static struct pcmcia_device_id btuart_ids[] = {
712
713 PCMCIA_DEVICE_NULL
714};
715MODULE_DEVICE_TABLE(pcmcia, btuart_ids);
716
717static struct pcmcia_driver btuart_driver = {
718 .owner = THIS_MODULE,
719 .drv = {
720 .name = "btuart_cs",
721 },
722 .probe = btuart_probe,
723 .remove = btuart_detach,
724 .id_table = btuart_ids,
725};
726
727static int __init init_btuart_cs(void)
728{
729 return pcmcia_register_driver(&btuart_driver);
730}
731
732
733static void __exit exit_btuart_cs(void)
734{
735 pcmcia_unregister_driver(&btuart_driver);
736}
737
738module_init(init_btuart_cs);
739module_exit(exit_btuart_cs);
740
