pcmcia: do not use io_req_t after call to pcmcia_request_io()
[linux-2.6.git] / drivers / bluetooth / dtl1_cs.c
1 /*
2  *
3  *  A driver for Nokia Connectivity Card DTL-1 devices
4  *
5  *  Copyright (C) 2001-2002  Marcel Holtmann <marcel@holtmann.org>
6  *
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License version 2 as
10  *  published by the Free Software Foundation;
11  *
12  *  Software distributed under the License is distributed on an "AS
13  *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
14  *  implied. See the License for the specific language governing
15  *  rights and limitations under the License.
16  *
17  *  The initial developer of the original code is David A. Hinds
18  *  <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
19  *  are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
20  *
21  */
22
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.h>
45 #include <pcmcia/cistpl.h>
46 #include <pcmcia/ciscode.h>
47 #include <pcmcia/ds.h>
48 #include <pcmcia/cisreg.h>
49
50 #include <net/bluetooth/bluetooth.h>
51 #include <net/bluetooth/hci_core.h>
52
53
54
55 /* ======================== Module parameters ======================== */
56
57
58 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
59 MODULE_DESCRIPTION("Bluetooth driver for Nokia Connectivity Card DTL-1");
60 MODULE_LICENSE("GPL");
61
62
63
64 /* ======================== Local structures ======================== */
65
66
67 typedef struct dtl1_info_t {
68         struct pcmcia_device *p_dev;
69
70         struct hci_dev *hdev;
71
72         spinlock_t lock;                /* For serializing operations */
73
74         unsigned long flowmask;         /* HCI flow mask */
75         int ri_latch;
76
77         struct sk_buff_head txq;
78         unsigned long tx_state;
79
80         unsigned long rx_state;
81         unsigned long rx_count;
82         struct sk_buff *rx_skb;
83 } dtl1_info_t;
84
85
86 static int dtl1_config(struct pcmcia_device *link);
87 static void dtl1_release(struct pcmcia_device *link);
88
89 static void dtl1_detach(struct pcmcia_device *p_dev);
90
91
92 /* Transmit states  */
93 #define XMIT_SENDING  1
94 #define XMIT_WAKEUP   2
95 #define XMIT_WAITING  8
96
97 /* Receiver States */
98 #define RECV_WAIT_NSH   0
99 #define RECV_WAIT_DATA  1
100
101
102 typedef struct {
103         u8 type;
104         u8 zero;
105         u16 len;
106 } __attribute__ ((packed)) nsh_t;       /* Nokia Specific Header */
107
108 #define NSHL  4                         /* Nokia Specific Header Length */
109
110
111
112 /* ======================== Interrupt handling ======================== */
113
114
115 static int dtl1_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
116 {
117         int actual = 0;
118
119         /* Tx FIFO should be empty */
120         if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
121                 return 0;
122
123         /* Fill FIFO with current frame */
124         while ((fifo_size-- > 0) && (actual < len)) {
125                 /* Transmit next byte */
126                 outb(buf[actual], iobase + UART_TX);
127                 actual++;
128         }
129
130         return actual;
131 }
132
133
134 static void dtl1_write_wakeup(dtl1_info_t *info)
135 {
136         if (!info) {
137                 BT_ERR("Unknown device");
138                 return;
139         }
140
141         if (test_bit(XMIT_WAITING, &(info->tx_state))) {
142                 set_bit(XMIT_WAKEUP, &(info->tx_state));
143                 return;
144         }
145
146         if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
147                 set_bit(XMIT_WAKEUP, &(info->tx_state));
148                 return;
149         }
150
151         do {
152                 register unsigned int iobase = info->p_dev->resource[0]->start;
153                 register struct sk_buff *skb;
154                 register int len;
155
156                 clear_bit(XMIT_WAKEUP, &(info->tx_state));
157
158                 if (!pcmcia_dev_present(info->p_dev))
159                         return;
160
161                 if (!(skb = skb_dequeue(&(info->txq))))
162                         break;
163
164                 /* Send frame */
165                 len = dtl1_write(iobase, 32, skb->data, skb->len);
166
167                 if (len == skb->len) {
168                         set_bit(XMIT_WAITING, &(info->tx_state));
169                         kfree_skb(skb);
170                 } else {
171                         skb_pull(skb, len);
172                         skb_queue_head(&(info->txq), skb);
173                 }
174
175                 info->hdev->stat.byte_tx += len;
176
177         } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
178
179         clear_bit(XMIT_SENDING, &(info->tx_state));
180 }
181
182
183 static void dtl1_control(dtl1_info_t *info, struct sk_buff *skb)
184 {
185         u8 flowmask = *(u8 *)skb->data;
186         int i;
187
188         printk(KERN_INFO "Bluetooth: Nokia control data =");
189         for (i = 0; i < skb->len; i++) {
190                 printk(" %02x", skb->data[i]);
191         }
192         printk("\n");
193
194         /* transition to active state */
195         if (((info->flowmask & 0x07) == 0) && ((flowmask & 0x07) != 0)) {
196                 clear_bit(XMIT_WAITING, &(info->tx_state));
197                 dtl1_write_wakeup(info);
198         }
199
200         info->flowmask = flowmask;
201
202         kfree_skb(skb);
203 }
204
205
206 static void dtl1_receive(dtl1_info_t *info)
207 {
208         unsigned int iobase;
209         nsh_t *nsh;
210         int boguscount = 0;
211
212         if (!info) {
213                 BT_ERR("Unknown device");
214                 return;
215         }
216
217         iobase = info->p_dev->resource[0]->start;
218
219         do {
220                 info->hdev->stat.byte_rx++;
221
222                 /* Allocate packet */
223                 if (info->rx_skb == NULL)
224                         if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
225                                 BT_ERR("Can't allocate mem for new packet");
226                                 info->rx_state = RECV_WAIT_NSH;
227                                 info->rx_count = NSHL;
228                                 return;
229                         }
230
231                 *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
232                 nsh = (nsh_t *)info->rx_skb->data;
233
234                 info->rx_count--;
235
236                 if (info->rx_count == 0) {
237
238                         switch (info->rx_state) {
239                         case RECV_WAIT_NSH:
240                                 info->rx_state = RECV_WAIT_DATA;
241                                 info->rx_count = nsh->len + (nsh->len & 0x0001);
242                                 break;
243                         case RECV_WAIT_DATA:
244                                 bt_cb(info->rx_skb)->pkt_type = nsh->type;
245
246                                 /* remove PAD byte if it exists */
247                                 if (nsh->len & 0x0001) {
248                                         info->rx_skb->tail--;
249                                         info->rx_skb->len--;
250                                 }
251
252                                 /* remove NSH */
253                                 skb_pull(info->rx_skb, NSHL);
254
255                                 switch (bt_cb(info->rx_skb)->pkt_type) {
256                                 case 0x80:
257                                         /* control data for the Nokia Card */
258                                         dtl1_control(info, info->rx_skb);
259                                         break;
260                                 case 0x82:
261                                 case 0x83:
262                                 case 0x84:
263                                         /* send frame to the HCI layer */
264                                         info->rx_skb->dev = (void *) info->hdev;
265                                         bt_cb(info->rx_skb)->pkt_type &= 0x0f;
266                                         hci_recv_frame(info->rx_skb);
267                                         break;
268                                 default:
269                                         /* unknown packet */
270                                         BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
271                                         kfree_skb(info->rx_skb);
272                                         break;
273                                 }
274
275                                 info->rx_state = RECV_WAIT_NSH;
276                                 info->rx_count = NSHL;
277                                 info->rx_skb = NULL;
278                                 break;
279                         }
280
281                 }
282
283                 /* Make sure we don't stay here too long */
284                 if (boguscount++ > 32)
285                         break;
286
287         } while (inb(iobase + UART_LSR) & UART_LSR_DR);
288 }
289
290
291 static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
292 {
293         dtl1_info_t *info = dev_inst;
294         unsigned int iobase;
295         unsigned char msr;
296         int boguscount = 0;
297         int iir, lsr;
298         irqreturn_t r = IRQ_NONE;
299
300         if (!info || !info->hdev)
301                 /* our irq handler is shared */
302                 return IRQ_NONE;
303
304         iobase = info->p_dev->resource[0]->start;
305
306         spin_lock(&(info->lock));
307
308         iir = inb(iobase + UART_IIR) & UART_IIR_ID;
309         while (iir) {
310
311                 r = IRQ_HANDLED;
312                 /* Clear interrupt */
313                 lsr = inb(iobase + UART_LSR);
314
315                 switch (iir) {
316                 case UART_IIR_RLSI:
317                         BT_ERR("RLSI");
318                         break;
319                 case UART_IIR_RDI:
320                         /* Receive interrupt */
321                         dtl1_receive(info);
322                         break;
323                 case UART_IIR_THRI:
324                         if (lsr & UART_LSR_THRE) {
325                                 /* Transmitter ready for data */
326                                 dtl1_write_wakeup(info);
327                         }
328                         break;
329                 default:
330                         BT_ERR("Unhandled IIR=%#x", iir);
331                         break;
332                 }
333
334                 /* Make sure we don't stay here too long */
335                 if (boguscount++ > 100)
336                         break;
337
338                 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
339
340         }
341
342         msr = inb(iobase + UART_MSR);
343
344         if (info->ri_latch ^ (msr & UART_MSR_RI)) {
345                 info->ri_latch = msr & UART_MSR_RI;
346                 clear_bit(XMIT_WAITING, &(info->tx_state));
347                 dtl1_write_wakeup(info);
348                 r = IRQ_HANDLED;
349         }
350
351         spin_unlock(&(info->lock));
352
353         return r;
354 }
355
356
357
358 /* ======================== HCI interface ======================== */
359
360
361 static int dtl1_hci_open(struct hci_dev *hdev)
362 {
363         set_bit(HCI_RUNNING, &(hdev->flags));
364
365         return 0;
366 }
367
368
369 static int dtl1_hci_flush(struct hci_dev *hdev)
370 {
371         dtl1_info_t *info = (dtl1_info_t *)(hdev->driver_data);
372
373         /* Drop TX queue */
374         skb_queue_purge(&(info->txq));
375
376         return 0;
377 }
378
379
380 static int dtl1_hci_close(struct hci_dev *hdev)
381 {
382         if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
383                 return 0;
384
385         dtl1_hci_flush(hdev);
386
387         return 0;
388 }
389
390
391 static int dtl1_hci_send_frame(struct sk_buff *skb)
392 {
393         dtl1_info_t *info;
394         struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
395         struct sk_buff *s;
396         nsh_t nsh;
397
398         if (!hdev) {
399                 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
400                 return -ENODEV;
401         }
402
403         info = (dtl1_info_t *)(hdev->driver_data);
404
405         switch (bt_cb(skb)->pkt_type) {
406         case HCI_COMMAND_PKT:
407                 hdev->stat.cmd_tx++;
408                 nsh.type = 0x81;
409                 break;
410         case HCI_ACLDATA_PKT:
411                 hdev->stat.acl_tx++;
412                 nsh.type = 0x82;
413                 break;
414         case HCI_SCODATA_PKT:
415                 hdev->stat.sco_tx++;
416                 nsh.type = 0x83;
417                 break;
418         default:
419                 return -EILSEQ;
420         };
421
422         nsh.zero = 0;
423         nsh.len = skb->len;
424
425         s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
426         if (!s)
427                 return -ENOMEM;
428
429         skb_reserve(s, NSHL);
430         skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
431         if (skb->len & 0x0001)
432                 *skb_put(s, 1) = 0;     /* PAD */
433
434         /* Prepend skb with Nokia frame header and queue */
435         memcpy(skb_push(s, NSHL), &nsh, NSHL);
436         skb_queue_tail(&(info->txq), s);
437
438         dtl1_write_wakeup(info);
439
440         kfree_skb(skb);
441
442         return 0;
443 }
444
445
446 static void dtl1_hci_destruct(struct hci_dev *hdev)
447 {
448 }
449
450
451 static int dtl1_hci_ioctl(struct hci_dev *hdev, unsigned int cmd,  unsigned long arg)
452 {
453         return -ENOIOCTLCMD;
454 }
455
456
457
458 /* ======================== Card services HCI interaction ======================== */
459
460
461 static int dtl1_open(dtl1_info_t *info)
462 {
463         unsigned long flags;
464         unsigned int iobase = info->p_dev->resource[0]->start;
465         struct hci_dev *hdev;
466
467         spin_lock_init(&(info->lock));
468
469         skb_queue_head_init(&(info->txq));
470
471         info->rx_state = RECV_WAIT_NSH;
472         info->rx_count = NSHL;
473         info->rx_skb = NULL;
474
475         set_bit(XMIT_WAITING, &(info->tx_state));
476
477         /* Initialize HCI device */
478         hdev = hci_alloc_dev();
479         if (!hdev) {
480                 BT_ERR("Can't allocate HCI device");
481                 return -ENOMEM;
482         }
483
484         info->hdev = hdev;
485
486         hdev->bus = HCI_PCCARD;
487         hdev->driver_data = info;
488         SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
489
490         hdev->open     = dtl1_hci_open;
491         hdev->close    = dtl1_hci_close;
492         hdev->flush    = dtl1_hci_flush;
493         hdev->send     = dtl1_hci_send_frame;
494         hdev->destruct = dtl1_hci_destruct;
495         hdev->ioctl    = dtl1_hci_ioctl;
496
497         hdev->owner = THIS_MODULE;
498
499         spin_lock_irqsave(&(info->lock), flags);
500
501         /* Reset UART */
502         outb(0, iobase + UART_MCR);
503
504         /* Turn off interrupts */
505         outb(0, iobase + UART_IER);
506
507         /* Initialize UART */
508         outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
509         outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
510
511         info->ri_latch = inb(info->p_dev->resource[0]->start + UART_MSR)
512                                 & UART_MSR_RI;
513
514         /* Turn on interrupts */
515         outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
516
517         spin_unlock_irqrestore(&(info->lock), flags);
518
519         /* Timeout before it is safe to send the first HCI packet */
520         msleep(2000);
521
522         /* Register HCI device */
523         if (hci_register_dev(hdev) < 0) {
524                 BT_ERR("Can't register HCI device");
525                 info->hdev = NULL;
526                 hci_free_dev(hdev);
527                 return -ENODEV;
528         }
529
530         return 0;
531 }
532
533
534 static int dtl1_close(dtl1_info_t *info)
535 {
536         unsigned long flags;
537         unsigned int iobase = info->p_dev->resource[0]->start;
538         struct hci_dev *hdev = info->hdev;
539
540         if (!hdev)
541                 return -ENODEV;
542
543         dtl1_hci_close(hdev);
544
545         spin_lock_irqsave(&(info->lock), flags);
546
547         /* Reset UART */
548         outb(0, iobase + UART_MCR);
549
550         /* Turn off interrupts */
551         outb(0, iobase + UART_IER);
552
553         spin_unlock_irqrestore(&(info->lock), flags);
554
555         if (hci_unregister_dev(hdev) < 0)
556                 BT_ERR("Can't unregister HCI device %s", hdev->name);
557
558         hci_free_dev(hdev);
559
560         return 0;
561 }
562
563 static int dtl1_probe(struct pcmcia_device *link)
564 {
565         dtl1_info_t *info;
566
567         /* Create new info device */
568         info = kzalloc(sizeof(*info), GFP_KERNEL);
569         if (!info)
570                 return -ENOMEM;
571
572         info->p_dev = link;
573         link->priv = info;
574
575         link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
576         link->io.NumPorts1 = 8;
577
578         link->conf.Attributes = CONF_ENABLE_IRQ;
579         link->conf.IntType = INT_MEMORY_AND_IO;
580
581         return dtl1_config(link);
582 }
583
584
585 static void dtl1_detach(struct pcmcia_device *link)
586 {
587         dtl1_info_t *info = link->priv;
588
589         dtl1_release(link);
590
591         kfree(info);
592 }
593
594 static int dtl1_confcheck(struct pcmcia_device *p_dev,
595                           cistpl_cftable_entry_t *cf,
596                           cistpl_cftable_entry_t *dflt,
597                           unsigned int vcc,
598                           void *priv_data)
599 {
600         if ((cf->io.nwin == 1) && (cf->io.win[0].len > 8)) {
601                 p_dev->io.BasePort1 = cf->io.win[0].base;
602                 p_dev->io.NumPorts1 = cf->io.win[0].len;        /*yo */
603                 p_dev->io.IOAddrLines = cf->io.flags & CISTPL_IO_LINES_MASK;
604                 if (!pcmcia_request_io(p_dev, &p_dev->io))
605                         return 0;
606         }
607         return -ENODEV;
608 }
609
610 static int dtl1_config(struct pcmcia_device *link)
611 {
612         dtl1_info_t *info = link->priv;
613         int i;
614
615         /* Look for a generic full-sized window */
616         link->io.NumPorts1 = 8;
617         if (pcmcia_loop_config(link, dtl1_confcheck, NULL) < 0)
618                 goto failed;
619
620         i = pcmcia_request_irq(link, dtl1_interrupt);
621         if (i != 0)
622                 goto failed;
623
624         i = pcmcia_request_configuration(link, &link->conf);
625         if (i != 0)
626                 goto failed;
627
628         if (dtl1_open(info) != 0)
629                 goto failed;
630
631         return 0;
632
633 failed:
634         dtl1_release(link);
635         return -ENODEV;
636 }
637
638
639 static void dtl1_release(struct pcmcia_device *link)
640 {
641         dtl1_info_t *info = link->priv;
642
643         dtl1_close(info);
644
645         pcmcia_disable_device(link);
646 }
647
648
649 static struct pcmcia_device_id dtl1_ids[] = {
650         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
651         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
652         PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
653         PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
654         PCMCIA_DEVICE_NULL
655 };
656 MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
657
658 static struct pcmcia_driver dtl1_driver = {
659         .owner          = THIS_MODULE,
660         .drv            = {
661                 .name   = "dtl1_cs",
662         },
663         .probe          = dtl1_probe,
664         .remove         = dtl1_detach,
665         .id_table       = dtl1_ids,
666 };
667
668 static int __init init_dtl1_cs(void)
669 {
670         return pcmcia_register_driver(&dtl1_driver);
671 }
672
673
674 static void __exit exit_dtl1_cs(void)
675 {
676         pcmcia_unregister_driver(&dtl1_driver);
677 }
678
679 module_init(init_dtl1_cs);
680 module_exit(exit_dtl1_cs);