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Linux/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/io.h>
 42 
 43 #include <pcmcia/cistpl.h>
 44 #include <pcmcia/ciscode.h>
 45 #include <pcmcia/ds.h>
 46 #include <pcmcia/cisreg.h>
 47 
 48 #include <net/bluetooth/bluetooth.h>
 49 #include <net/bluetooth/hci_core.h>
 50 
 51 
 52 
 53 /* ======================== Module parameters ======================== */
 54 
 55 
 56 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 57 MODULE_DESCRIPTION("Bluetooth driver for Nokia Connectivity Card DTL-1");
 58 MODULE_LICENSE("GPL");
 59 
 60 
 61 
 62 /* ======================== Local structures ======================== */
 63 
 64 
 65 struct dtl1_info {
 66         struct pcmcia_device *p_dev;
 67 
 68         struct hci_dev *hdev;
 69 
 70         spinlock_t lock;                /* For serializing operations */
 71 
 72         unsigned long flowmask;         /* HCI flow mask */
 73         int ri_latch;
 74 
 75         struct sk_buff_head txq;
 76         unsigned long tx_state;
 77 
 78         unsigned long rx_state;
 79         unsigned long rx_count;
 80         struct sk_buff *rx_skb;
 81 };
 82 
 83 
 84 static int dtl1_config(struct pcmcia_device *link);
 85 
 86 
 87 /* Transmit states  */
 88 #define XMIT_SENDING  1
 89 #define XMIT_WAKEUP   2
 90 #define XMIT_WAITING  8
 91 
 92 /* Receiver States */
 93 #define RECV_WAIT_NSH   0
 94 #define RECV_WAIT_DATA  1
 95 
 96 
 97 struct nsh {
 98         u8 type;
 99         u8 zero;
100         u16 len;
101 } __packed;     /* Nokia Specific Header */
102 
103 #define NSHL  4                         /* Nokia Specific Header Length */
104 
105 
106 
107 /* ======================== Interrupt handling ======================== */
108 
109 
110 static int dtl1_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
111 {
112         int actual = 0;
113 
114         /* Tx FIFO should be empty */
115         if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
116                 return 0;
117 
118         /* Fill FIFO with current frame */
119         while ((fifo_size-- > 0) && (actual < len)) {
120                 /* Transmit next byte */
121                 outb(buf[actual], iobase + UART_TX);
122                 actual++;
123         }
124 
125         return actual;
126 }
127 
128 
129 static void dtl1_write_wakeup(struct dtl1_info *info)
130 {
131         if (!info) {
132                 BT_ERR("Unknown device");
133                 return;
134         }
135 
136         if (test_bit(XMIT_WAITING, &(info->tx_state))) {
137                 set_bit(XMIT_WAKEUP, &(info->tx_state));
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                 unsigned int iobase = info->p_dev->resource[0]->start;
148                 register struct sk_buff *skb;
149                 int len;
150 
151                 clear_bit(XMIT_WAKEUP, &(info->tx_state));
152 
153                 if (!pcmcia_dev_present(info->p_dev))
154                         return;
155 
156                 skb = skb_dequeue(&(info->txq));
157                 if (!skb)
158                         break;
159 
160                 /* Send frame */
161                 len = dtl1_write(iobase, 32, skb->data, skb->len);
162 
163                 if (len == skb->len) {
164                         set_bit(XMIT_WAITING, &(info->tx_state));
165                         kfree_skb(skb);
166                 } else {
167                         skb_pull(skb, len);
168                         skb_queue_head(&(info->txq), skb);
169                 }
170 
171                 info->hdev->stat.byte_tx += len;
172 
173         } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
174 
175         clear_bit(XMIT_SENDING, &(info->tx_state));
176 }
177 
178 
179 static void dtl1_control(struct dtl1_info *info, struct sk_buff *skb)
180 {
181         u8 flowmask = *(u8 *)skb->data;
182         int i;
183 
184         printk(KERN_INFO "Bluetooth: Nokia control data =");
185         for (i = 0; i < skb->len; i++)
186                 printk(" %02x", skb->data[i]);
187 
188         printk("\n");
189 
190         /* transition to active state */
191         if (((info->flowmask & 0x07) == 0) && ((flowmask & 0x07) != 0)) {
192                 clear_bit(XMIT_WAITING, &(info->tx_state));
193                 dtl1_write_wakeup(info);
194         }
195 
196         info->flowmask = flowmask;
197 
198         kfree_skb(skb);
199 }
200 
201 
202 static void dtl1_receive(struct dtl1_info *info)
203 {
204         unsigned int iobase;
205         struct nsh *nsh;
206         int boguscount = 0;
207 
208         if (!info) {
209                 BT_ERR("Unknown device");
210                 return;
211         }
212 
213         iobase = info->p_dev->resource[0]->start;
214 
215         do {
216                 info->hdev->stat.byte_rx++;
217 
218                 /* Allocate packet */
219                 if (info->rx_skb == NULL) {
220                         info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
221                         if (!info->rx_skb) {
222                                 BT_ERR("Can't allocate mem for new packet");
223                                 info->rx_state = RECV_WAIT_NSH;
224                                 info->rx_count = NSHL;
225                                 return;
226                         }
227                 }
228 
229                 *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
230                 nsh = (struct nsh *)info->rx_skb->data;
231 
232                 info->rx_count--;
233 
234                 if (info->rx_count == 0) {
235 
236                         switch (info->rx_state) {
237                         case RECV_WAIT_NSH:
238                                 info->rx_state = RECV_WAIT_DATA;
239                                 info->rx_count = nsh->len + (nsh->len & 0x0001);
240                                 break;
241                         case RECV_WAIT_DATA:
242                                 hci_skb_pkt_type(info->rx_skb) = nsh->type;
243 
244                                 /* remove PAD byte if it exists */
245                                 if (nsh->len & 0x0001) {
246                                         info->rx_skb->tail--;
247                                         info->rx_skb->len--;
248                                 }
249 
250                                 /* remove NSH */
251                                 skb_pull(info->rx_skb, NSHL);
252 
253                                 switch (hci_skb_pkt_type(info->rx_skb)) {
254                                 case 0x80:
255                                         /* control data for the Nokia Card */
256                                         dtl1_control(info, info->rx_skb);
257                                         break;
258                                 case 0x82:
259                                 case 0x83:
260                                 case 0x84:
261                                         /* send frame to the HCI layer */
262                                         hci_skb_pkt_type(info->rx_skb) &= 0x0f;
263                                         hci_recv_frame(info->hdev, info->rx_skb);
264                                         break;
265                                 default:
266                                         /* unknown packet */
267                                         BT_ERR("Unknown HCI packet with type 0x%02x received",
268                                                hci_skb_pkt_type(info->rx_skb));
269                                         kfree_skb(info->rx_skb);
270                                         break;
271                                 }
272 
273                                 info->rx_state = RECV_WAIT_NSH;
274                                 info->rx_count = NSHL;
275                                 info->rx_skb = NULL;
276                                 break;
277                         }
278 
279                 }
280 
281                 /* Make sure we don't stay here too long */
282                 if (boguscount++ > 32)
283                         break;
284 
285         } while (inb(iobase + UART_LSR) & UART_LSR_DR);
286 }
287 
288 
289 static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
290 {
291         struct dtl1_info *info = dev_inst;
292         unsigned int iobase;
293         unsigned char msr;
294         int boguscount = 0;
295         int iir, lsr;
296         irqreturn_t r = IRQ_NONE;
297 
298         if (!info || !info->hdev)
299                 /* our irq handler is shared */
300                 return IRQ_NONE;
301 
302         iobase = info->p_dev->resource[0]->start;
303 
304         spin_lock(&(info->lock));
305 
306         iir = inb(iobase + UART_IIR) & UART_IIR_ID;
307         while (iir) {
308 
309                 r = IRQ_HANDLED;
310                 /* Clear interrupt */
311                 lsr = inb(iobase + UART_LSR);
312 
313                 switch (iir) {
314                 case UART_IIR_RLSI:
315                         BT_ERR("RLSI");
316                         break;
317                 case UART_IIR_RDI:
318                         /* Receive interrupt */
319                         dtl1_receive(info);
320                         break;
321                 case UART_IIR_THRI:
322                         if (lsr & UART_LSR_THRE) {
323                                 /* Transmitter ready for data */
324                                 dtl1_write_wakeup(info);
325                         }
326                         break;
327                 default:
328                         BT_ERR("Unhandled IIR=%#x", iir);
329                         break;
330                 }
331 
332                 /* Make sure we don't stay here too long */
333                 if (boguscount++ > 100)
334                         break;
335 
336                 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
337 
338         }
339 
340         msr = inb(iobase + UART_MSR);
341 
342         if (info->ri_latch ^ (msr & UART_MSR_RI)) {
343                 info->ri_latch = msr & UART_MSR_RI;
344                 clear_bit(XMIT_WAITING, &(info->tx_state));
345                 dtl1_write_wakeup(info);
346                 r = IRQ_HANDLED;
347         }
348 
349         spin_unlock(&(info->lock));
350 
351         return r;
352 }
353 
354 
355 
356 /* ======================== HCI interface ======================== */
357 
358 
359 static int dtl1_hci_open(struct hci_dev *hdev)
360 {
361         return 0;
362 }
363 
364 
365 static int dtl1_hci_flush(struct hci_dev *hdev)
366 {
367         struct dtl1_info *info = hci_get_drvdata(hdev);
368 
369         /* Drop TX queue */
370         skb_queue_purge(&(info->txq));
371 
372         return 0;
373 }
374 
375 
376 static int dtl1_hci_close(struct hci_dev *hdev)
377 {
378         dtl1_hci_flush(hdev);
379 
380         return 0;
381 }
382 
383 
384 static int dtl1_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
385 {
386         struct dtl1_info *info = hci_get_drvdata(hdev);
387         struct sk_buff *s;
388         struct nsh nsh;
389 
390         switch (hci_skb_pkt_type(skb)) {
391         case HCI_COMMAND_PKT:
392                 hdev->stat.cmd_tx++;
393                 nsh.type = 0x81;
394                 break;
395         case HCI_ACLDATA_PKT:
396                 hdev->stat.acl_tx++;
397                 nsh.type = 0x82;
398                 break;
399         case HCI_SCODATA_PKT:
400                 hdev->stat.sco_tx++;
401                 nsh.type = 0x83;
402                 break;
403         default:
404                 return -EILSEQ;
405         }
406 
407         nsh.zero = 0;
408         nsh.len = skb->len;
409 
410         s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
411         if (!s)
412                 return -ENOMEM;
413 
414         skb_reserve(s, NSHL);
415         skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
416         if (skb->len & 0x0001)
417                 *skb_put(s, 1) = 0;     /* PAD */
418 
419         /* Prepend skb with Nokia frame header and queue */
420         memcpy(skb_push(s, NSHL), &nsh, NSHL);
421         skb_queue_tail(&(info->txq), s);
422 
423         dtl1_write_wakeup(info);
424 
425         kfree_skb(skb);
426 
427         return 0;
428 }
429 
430 
431 
432 /* ======================== Card services HCI interaction ======================== */
433 
434 
435 static int dtl1_open(struct dtl1_info *info)
436 {
437         unsigned long flags;
438         unsigned int iobase = info->p_dev->resource[0]->start;
439         struct hci_dev *hdev;
440 
441         spin_lock_init(&(info->lock));
442 
443         skb_queue_head_init(&(info->txq));
444 
445         info->rx_state = RECV_WAIT_NSH;
446         info->rx_count = NSHL;
447         info->rx_skb = NULL;
448 
449         set_bit(XMIT_WAITING, &(info->tx_state));
450 
451         /* Initialize HCI device */
452         hdev = hci_alloc_dev();
453         if (!hdev) {
454                 BT_ERR("Can't allocate HCI device");
455                 return -ENOMEM;
456         }
457 
458         info->hdev = hdev;
459 
460         hdev->bus = HCI_PCCARD;
461         hci_set_drvdata(hdev, info);
462         SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
463 
464         hdev->open  = dtl1_hci_open;
465         hdev->close = dtl1_hci_close;
466         hdev->flush = dtl1_hci_flush;
467         hdev->send  = dtl1_hci_send_frame;
468 
469         spin_lock_irqsave(&(info->lock), flags);
470 
471         /* Reset UART */
472         outb(0, iobase + UART_MCR);
473 
474         /* Turn off interrupts */
475         outb(0, iobase + UART_IER);
476 
477         /* Initialize UART */
478         outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
479         outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
480 
481         info->ri_latch = inb(info->p_dev->resource[0]->start + UART_MSR)
482                                 & UART_MSR_RI;
483 
484         /* Turn on interrupts */
485         outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
486 
487         spin_unlock_irqrestore(&(info->lock), flags);
488 
489         /* Timeout before it is safe to send the first HCI packet */
490         msleep(2000);
491 
492         /* Register HCI device */
493         if (hci_register_dev(hdev) < 0) {
494                 BT_ERR("Can't register HCI device");
495                 info->hdev = NULL;
496                 hci_free_dev(hdev);
497                 return -ENODEV;
498         }
499 
500         return 0;
501 }
502 
503 
504 static int dtl1_close(struct dtl1_info *info)
505 {
506         unsigned long flags;
507         unsigned int iobase = info->p_dev->resource[0]->start;
508         struct hci_dev *hdev = info->hdev;
509 
510         if (!hdev)
511                 return -ENODEV;
512 
513         dtl1_hci_close(hdev);
514 
515         spin_lock_irqsave(&(info->lock), flags);
516 
517         /* Reset UART */
518         outb(0, iobase + UART_MCR);
519 
520         /* Turn off interrupts */
521         outb(0, iobase + UART_IER);
522 
523         spin_unlock_irqrestore(&(info->lock), flags);
524 
525         hci_unregister_dev(hdev);
526         hci_free_dev(hdev);
527 
528         return 0;
529 }
530 
531 static int dtl1_probe(struct pcmcia_device *link)
532 {
533         struct dtl1_info *info;
534 
535         /* Create new info device */
536         info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
537         if (!info)
538                 return -ENOMEM;
539 
540         info->p_dev = link;
541         link->priv = info;
542 
543         link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
544 
545         return dtl1_config(link);
546 }
547 
548 
549 static void dtl1_detach(struct pcmcia_device *link)
550 {
551         struct dtl1_info *info = link->priv;
552 
553         dtl1_close(info);
554         pcmcia_disable_device(link);
555 }
556 
557 static int dtl1_confcheck(struct pcmcia_device *p_dev, void *priv_data)
558 {
559         if ((p_dev->resource[1]->end) || (p_dev->resource[1]->end < 8))
560                 return -ENODEV;
561 
562         p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
563         p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
564 
565         return pcmcia_request_io(p_dev);
566 }
567 
568 static int dtl1_config(struct pcmcia_device *link)
569 {
570         struct dtl1_info *info = link->priv;
571         int ret;
572 
573         /* Look for a generic full-sized window */
574         link->resource[0]->end = 8;
575         ret = pcmcia_loop_config(link, dtl1_confcheck, NULL);
576         if (ret)
577                 goto failed;
578 
579         ret = pcmcia_request_irq(link, dtl1_interrupt);
580         if (ret)
581                 goto failed;
582 
583         ret = pcmcia_enable_device(link);
584         if (ret)
585                 goto failed;
586 
587         ret = dtl1_open(info);
588         if (ret)
589                 goto failed;
590 
591         return 0;
592 
593 failed:
594         dtl1_detach(link);
595         return ret;
596 }
597 
598 static const struct pcmcia_device_id dtl1_ids[] = {
599         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
600         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
601         PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
602         PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
603         PCMCIA_DEVICE_NULL
604 };
605 MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
606 
607 static struct pcmcia_driver dtl1_driver = {
608         .owner          = THIS_MODULE,
609         .name           = "dtl1_cs",
610         .probe          = dtl1_probe,
611         .remove         = dtl1_detach,
612         .id_table       = dtl1_ids,
613 };
614 module_pcmcia_driver(dtl1_driver);
615 

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