Linux-2.6.12-rc2
[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/config.h>
24 #include <linux/module.h>
25
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/types.h>
30 #include <linux/sched.h>
31 #include <linux/delay.h>
32 #include <linux/errno.h>
33 #include <linux/ptrace.h>
34 #include <linux/ioport.h>
35 #include <linux/spinlock.h>
36 #include <linux/moduleparam.h>
37
38 #include <linux/skbuff.h>
39 #include <linux/string.h>
40 #include <linux/serial.h>
41 #include <linux/serial_reg.h>
42 #include <linux/bitops.h>
43 #include <asm/system.h>
44 #include <asm/io.h>
45
46 #include <pcmcia/version.h>
47 #include <pcmcia/cs_types.h>
48 #include <pcmcia/cs.h>
49 #include <pcmcia/cistpl.h>
50 #include <pcmcia/ciscode.h>
51 #include <pcmcia/ds.h>
52 #include <pcmcia/cisreg.h>
53
54 #include <net/bluetooth/bluetooth.h>
55 #include <net/bluetooth/hci_core.h>
56
57
58
59 /* ======================== Module parameters ======================== */
60
61
62 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
63 MODULE_DESCRIPTION("Bluetooth driver for Nokia Connectivity Card DTL-1");
64 MODULE_LICENSE("GPL");
65
66
67
68 /* ======================== Local structures ======================== */
69
70
71 typedef struct dtl1_info_t {
72         dev_link_t link;
73         dev_node_t node;
74
75         struct hci_dev *hdev;
76
77         spinlock_t lock;                /* For serializing operations */
78
79         unsigned long flowmask;         /* HCI flow mask */
80         int ri_latch;
81
82         struct sk_buff_head txq;
83         unsigned long tx_state;
84
85         unsigned long rx_state;
86         unsigned long rx_count;
87         struct sk_buff *rx_skb;
88 } dtl1_info_t;
89
90
91 static void dtl1_config(dev_link_t *link);
92 static void dtl1_release(dev_link_t *link);
93 static int dtl1_event(event_t event, int priority, event_callback_args_t *args);
94
95 static dev_info_t dev_info = "dtl1_cs";
96
97 static dev_link_t *dtl1_attach(void);
98 static void dtl1_detach(dev_link_t *);
99
100 static dev_link_t *dev_list = NULL;
101
102
103 /* Transmit states  */
104 #define XMIT_SENDING  1
105 #define XMIT_WAKEUP   2
106 #define XMIT_WAITING  8
107
108 /* Receiver States */
109 #define RECV_WAIT_NSH   0
110 #define RECV_WAIT_DATA  1
111
112
113 typedef struct {
114         u8 type;
115         u8 zero;
116         u16 len;
117 } __attribute__ ((packed)) nsh_t;       /* Nokia Specific Header */
118
119 #define NSHL  4                         /* Nokia Specific Header Length */
120
121
122
123 /* ======================== Interrupt handling ======================== */
124
125
126 static int dtl1_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
127 {
128         int actual = 0;
129
130         /* Tx FIFO should be empty */
131         if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
132                 return 0;
133
134         /* Fill FIFO with current frame */
135         while ((fifo_size-- > 0) && (actual < len)) {
136                 /* Transmit next byte */
137                 outb(buf[actual], iobase + UART_TX);
138                 actual++;
139         }
140
141         return actual;
142 }
143
144
145 static void dtl1_write_wakeup(dtl1_info_t *info)
146 {
147         if (!info) {
148                 BT_ERR("Unknown device");
149                 return;
150         }
151
152         if (test_bit(XMIT_WAITING, &(info->tx_state))) {
153                 set_bit(XMIT_WAKEUP, &(info->tx_state));
154                 return;
155         }
156
157         if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
158                 set_bit(XMIT_WAKEUP, &(info->tx_state));
159                 return;
160         }
161
162         do {
163                 register unsigned int iobase = info->link.io.BasePort1;
164                 register struct sk_buff *skb;
165                 register int len;
166
167                 clear_bit(XMIT_WAKEUP, &(info->tx_state));
168
169                 if (!(info->link.state & DEV_PRESENT))
170                         return;
171
172                 if (!(skb = skb_dequeue(&(info->txq))))
173                         break;
174
175                 /* Send frame */
176                 len = dtl1_write(iobase, 32, skb->data, skb->len);
177
178                 if (len == skb->len) {
179                         set_bit(XMIT_WAITING, &(info->tx_state));
180                         kfree_skb(skb);
181                 } else {
182                         skb_pull(skb, len);
183                         skb_queue_head(&(info->txq), skb);
184                 }
185
186                 info->hdev->stat.byte_tx += len;
187
188         } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
189
190         clear_bit(XMIT_SENDING, &(info->tx_state));
191 }
192
193
194 static void dtl1_control(dtl1_info_t *info, struct sk_buff *skb)
195 {
196         u8 flowmask = *(u8 *)skb->data;
197         int i;
198
199         printk(KERN_INFO "Bluetooth: Nokia control data =");
200         for (i = 0; i < skb->len; i++) {
201                 printk(" %02x", skb->data[i]);
202         }
203         printk("\n");
204
205         /* transition to active state */
206         if (((info->flowmask & 0x07) == 0) && ((flowmask & 0x07) != 0)) {
207                 clear_bit(XMIT_WAITING, &(info->tx_state));
208                 dtl1_write_wakeup(info);
209         }
210
211         info->flowmask = flowmask;
212
213         kfree_skb(skb);
214 }
215
216
217 static void dtl1_receive(dtl1_info_t *info)
218 {
219         unsigned int iobase;
220         nsh_t *nsh;
221         int boguscount = 0;
222
223         if (!info) {
224                 BT_ERR("Unknown device");
225                 return;
226         }
227
228         iobase = info->link.io.BasePort1;
229
230         do {
231                 info->hdev->stat.byte_rx++;
232
233                 /* Allocate packet */
234                 if (info->rx_skb == NULL)
235                         if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
236                                 BT_ERR("Can't allocate mem for new packet");
237                                 info->rx_state = RECV_WAIT_NSH;
238                                 info->rx_count = NSHL;
239                                 return;
240                         }
241
242                 *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
243                 nsh = (nsh_t *)info->rx_skb->data;
244
245                 info->rx_count--;
246
247                 if (info->rx_count == 0) {
248
249                         switch (info->rx_state) {
250                         case RECV_WAIT_NSH:
251                                 info->rx_state = RECV_WAIT_DATA;
252                                 info->rx_count = nsh->len + (nsh->len & 0x0001);
253                                 break;
254                         case RECV_WAIT_DATA:
255                                 info->rx_skb->pkt_type = nsh->type;
256
257                                 /* remove PAD byte if it exists */
258                                 if (nsh->len & 0x0001) {
259                                         info->rx_skb->tail--;
260                                         info->rx_skb->len--;
261                                 }
262
263                                 /* remove NSH */
264                                 skb_pull(info->rx_skb, NSHL);
265
266                                 switch (info->rx_skb->pkt_type) {
267                                 case 0x80:
268                                         /* control data for the Nokia Card */
269                                         dtl1_control(info, info->rx_skb);
270                                         break;
271                                 case 0x82:
272                                 case 0x83:
273                                 case 0x84:
274                                         /* send frame to the HCI layer */
275                                         info->rx_skb->dev = (void *) info->hdev;
276                                         info->rx_skb->pkt_type &= 0x0f;
277                                         hci_recv_frame(info->rx_skb);
278                                         break;
279                                 default:
280                                         /* unknown packet */
281                                         BT_ERR("Unknown HCI packet with type 0x%02x received", info->rx_skb->pkt_type);
282                                         kfree_skb(info->rx_skb);
283                                         break;
284                                 }
285
286                                 info->rx_state = RECV_WAIT_NSH;
287                                 info->rx_count = NSHL;
288                                 info->rx_skb = NULL;
289                                 break;
290                         }
291
292                 }
293
294                 /* Make sure we don't stay here too long */
295                 if (boguscount++ > 32)
296                         break;
297
298         } while (inb(iobase + UART_LSR) & UART_LSR_DR);
299 }
300
301
302 static irqreturn_t dtl1_interrupt(int irq, void *dev_inst, struct pt_regs *regs)
303 {
304         dtl1_info_t *info = dev_inst;
305         unsigned int iobase;
306         unsigned char msr;
307         int boguscount = 0;
308         int iir, lsr;
309
310         if (!info || !info->hdev) {
311                 BT_ERR("Call of irq %d for unknown device", irq);
312                 return IRQ_NONE;
313         }
314
315         iobase = info->link.io.BasePort1;
316
317         spin_lock(&(info->lock));
318
319         iir = inb(iobase + UART_IIR) & UART_IIR_ID;
320         while (iir) {
321
322                 /* Clear interrupt */
323                 lsr = inb(iobase + UART_LSR);
324
325                 switch (iir) {
326                 case UART_IIR_RLSI:
327                         BT_ERR("RLSI");
328                         break;
329                 case UART_IIR_RDI:
330                         /* Receive interrupt */
331                         dtl1_receive(info);
332                         break;
333                 case UART_IIR_THRI:
334                         if (lsr & UART_LSR_THRE) {
335                                 /* Transmitter ready for data */
336                                 dtl1_write_wakeup(info);
337                         }
338                         break;
339                 default:
340                         BT_ERR("Unhandled IIR=%#x", iir);
341                         break;
342                 }
343
344                 /* Make sure we don't stay here too long */
345                 if (boguscount++ > 100)
346                         break;
347
348                 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
349
350         }
351
352         msr = inb(iobase + UART_MSR);
353
354         if (info->ri_latch ^ (msr & UART_MSR_RI)) {
355                 info->ri_latch = msr & UART_MSR_RI;
356                 clear_bit(XMIT_WAITING, &(info->tx_state));
357                 dtl1_write_wakeup(info);
358         }
359
360         spin_unlock(&(info->lock));
361
362         return IRQ_HANDLED;
363 }
364
365
366
367 /* ======================== HCI interface ======================== */
368
369
370 static int dtl1_hci_open(struct hci_dev *hdev)
371 {
372         set_bit(HCI_RUNNING, &(hdev->flags));
373
374         return 0;
375 }
376
377
378 static int dtl1_hci_flush(struct hci_dev *hdev)
379 {
380         dtl1_info_t *info = (dtl1_info_t *)(hdev->driver_data);
381
382         /* Drop TX queue */
383         skb_queue_purge(&(info->txq));
384
385         return 0;
386 }
387
388
389 static int dtl1_hci_close(struct hci_dev *hdev)
390 {
391         if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
392                 return 0;
393
394         dtl1_hci_flush(hdev);
395
396         return 0;
397 }
398
399
400 static int dtl1_hci_send_frame(struct sk_buff *skb)
401 {
402         dtl1_info_t *info;
403         struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
404         struct sk_buff *s;
405         nsh_t nsh;
406
407         if (!hdev) {
408                 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
409                 return -ENODEV;
410         }
411
412         info = (dtl1_info_t *)(hdev->driver_data);
413
414         switch (skb->pkt_type) {
415         case HCI_COMMAND_PKT:
416                 hdev->stat.cmd_tx++;
417                 nsh.type = 0x81;
418                 break;
419         case HCI_ACLDATA_PKT:
420                 hdev->stat.acl_tx++;
421                 nsh.type = 0x82;
422                 break;
423         case HCI_SCODATA_PKT:
424                 hdev->stat.sco_tx++;
425                 nsh.type = 0x83;
426                 break;
427         };
428
429         nsh.zero = 0;
430         nsh.len = skb->len;
431
432         s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
433         skb_reserve(s, NSHL);
434         memcpy(skb_put(s, skb->len), skb->data, skb->len);
435         if (skb->len & 0x0001)
436                 *skb_put(s, 1) = 0;     /* PAD */
437
438         /* Prepend skb with Nokia frame header and queue */
439         memcpy(skb_push(s, NSHL), &nsh, NSHL);
440         skb_queue_tail(&(info->txq), s);
441
442         dtl1_write_wakeup(info);
443
444         kfree_skb(skb);
445
446         return 0;
447 }
448
449
450 static void dtl1_hci_destruct(struct hci_dev *hdev)
451 {
452 }
453
454
455 static int dtl1_hci_ioctl(struct hci_dev *hdev, unsigned int cmd,  unsigned long arg)
456 {
457         return -ENOIOCTLCMD;
458 }
459
460
461
462 /* ======================== Card services HCI interaction ======================== */
463
464
465 static int dtl1_open(dtl1_info_t *info)
466 {
467         unsigned long flags;
468         unsigned int iobase = info->link.io.BasePort1;
469         struct hci_dev *hdev;
470
471         spin_lock_init(&(info->lock));
472
473         skb_queue_head_init(&(info->txq));
474
475         info->rx_state = RECV_WAIT_NSH;
476         info->rx_count = NSHL;
477         info->rx_skb = NULL;
478
479         set_bit(XMIT_WAITING, &(info->tx_state));
480
481         /* Initialize HCI device */
482         hdev = hci_alloc_dev();
483         if (!hdev) {
484                 BT_ERR("Can't allocate HCI device");
485                 return -ENOMEM;
486         }
487
488         info->hdev = hdev;
489
490         hdev->type = HCI_PCCARD;
491         hdev->driver_data = info;
492
493         hdev->open     = dtl1_hci_open;
494         hdev->close    = dtl1_hci_close;
495         hdev->flush    = dtl1_hci_flush;
496         hdev->send     = dtl1_hci_send_frame;
497         hdev->destruct = dtl1_hci_destruct;
498         hdev->ioctl    = dtl1_hci_ioctl;
499
500         hdev->owner = THIS_MODULE;
501
502         spin_lock_irqsave(&(info->lock), flags);
503
504         /* Reset UART */
505         outb(0, iobase + UART_MCR);
506
507         /* Turn off interrupts */
508         outb(0, iobase + UART_IER);
509
510         /* Initialize UART */
511         outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
512         outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
513
514         info->ri_latch = inb(info->link.io.BasePort1 + UART_MSR) & UART_MSR_RI;
515
516         /* Turn on interrupts */
517         outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
518
519         spin_unlock_irqrestore(&(info->lock), flags);
520
521         /* Timeout before it is safe to send the first HCI packet */
522         msleep(2000);
523
524         /* Register HCI device */
525         if (hci_register_dev(hdev) < 0) {
526                 BT_ERR("Can't register HCI device");
527                 info->hdev = NULL;
528                 hci_free_dev(hdev);
529                 return -ENODEV;
530         }
531
532         return 0;
533 }
534
535
536 static int dtl1_close(dtl1_info_t *info)
537 {
538         unsigned long flags;
539         unsigned int iobase = info->link.io.BasePort1;
540         struct hci_dev *hdev = info->hdev;
541
542         if (!hdev)
543                 return -ENODEV;
544
545         dtl1_hci_close(hdev);
546
547         spin_lock_irqsave(&(info->lock), flags);
548
549         /* Reset UART */
550         outb(0, iobase + UART_MCR);
551
552         /* Turn off interrupts */
553         outb(0, iobase + UART_IER);
554
555         spin_unlock_irqrestore(&(info->lock), flags);
556
557         if (hci_unregister_dev(hdev) < 0)
558                 BT_ERR("Can't unregister HCI device %s", hdev->name);
559
560         hci_free_dev(hdev);
561
562         return 0;
563 }
564
565 static dev_link_t *dtl1_attach(void)
566 {
567         dtl1_info_t *info;
568         client_reg_t client_reg;
569         dev_link_t *link;
570         int ret;
571
572         /* Create new info device */
573         info = kmalloc(sizeof(*info), GFP_KERNEL);
574         if (!info)
575                 return NULL;
576         memset(info, 0, sizeof(*info));
577
578         link = &info->link;
579         link->priv = info;
580
581         link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
582         link->io.NumPorts1 = 8;
583         link->irq.Attributes = IRQ_TYPE_EXCLUSIVE | IRQ_HANDLE_PRESENT;
584         link->irq.IRQInfo1 = IRQ_LEVEL_ID;
585
586         link->irq.Handler = dtl1_interrupt;
587         link->irq.Instance = info;
588
589         link->conf.Attributes = CONF_ENABLE_IRQ;
590         link->conf.Vcc = 50;
591         link->conf.IntType = INT_MEMORY_AND_IO;
592
593         /* Register with Card Services */
594         link->next = dev_list;
595         dev_list = link;
596         client_reg.dev_info = &dev_info;
597         client_reg.EventMask =
598                 CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
599                 CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
600                 CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
601         client_reg.event_handler = &dtl1_event;
602         client_reg.Version = 0x0210;
603         client_reg.event_callback_args.client_data = link;
604
605         ret = pcmcia_register_client(&link->handle, &client_reg);
606         if (ret != CS_SUCCESS) {
607                 cs_error(link->handle, RegisterClient, ret);
608                 dtl1_detach(link);
609                 return NULL;
610         }
611
612         return link;
613 }
614
615
616 static void dtl1_detach(dev_link_t *link)
617 {
618         dtl1_info_t *info = link->priv;
619         dev_link_t **linkp;
620         int ret;
621
622         /* Locate device structure */
623         for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
624                 if (*linkp == link)
625                         break;
626
627         if (*linkp == NULL)
628                 return;
629
630         if (link->state & DEV_CONFIG)
631                 dtl1_release(link);
632
633         if (link->handle) {
634                 ret = pcmcia_deregister_client(link->handle);
635                 if (ret != CS_SUCCESS)
636                         cs_error(link->handle, DeregisterClient, ret);
637         }
638
639         /* Unlink device structure, free bits */
640         *linkp = link->next;
641
642         kfree(info);
643 }
644
645 static int get_tuple(client_handle_t handle, tuple_t *tuple, cisparse_t *parse)
646 {
647         int i;
648
649         i = pcmcia_get_tuple_data(handle, tuple);
650         if (i != CS_SUCCESS)
651                 return i;
652
653         return pcmcia_parse_tuple(handle, tuple, parse);
654 }
655
656 static int first_tuple(client_handle_t handle, tuple_t *tuple, cisparse_t *parse)
657 {
658         if (pcmcia_get_first_tuple(handle, tuple) != CS_SUCCESS)
659                 return CS_NO_MORE_ITEMS;
660         return get_tuple(handle, tuple, parse);
661 }
662
663 static int next_tuple(client_handle_t handle, tuple_t *tuple, cisparse_t *parse)
664 {
665         if (pcmcia_get_next_tuple(handle, tuple) != CS_SUCCESS)
666                 return CS_NO_MORE_ITEMS;
667         return get_tuple(handle, tuple, parse);
668 }
669
670 static void dtl1_config(dev_link_t *link)
671 {
672         client_handle_t handle = link->handle;
673         dtl1_info_t *info = link->priv;
674         tuple_t tuple;
675         u_short buf[256];
676         cisparse_t parse;
677         cistpl_cftable_entry_t *cf = &parse.cftable_entry;
678         config_info_t config;
679         int i, last_ret, last_fn;
680
681         tuple.TupleData = (cisdata_t *)buf;
682         tuple.TupleOffset = 0;
683         tuple.TupleDataMax = 255;
684         tuple.Attributes = 0;
685
686         /* Get configuration register information */
687         tuple.DesiredTuple = CISTPL_CONFIG;
688         last_ret = first_tuple(handle, &tuple, &parse);
689         if (last_ret != CS_SUCCESS) {
690                 last_fn = ParseTuple;
691                 goto cs_failed;
692         }
693         link->conf.ConfigBase = parse.config.base;
694         link->conf.Present = parse.config.rmask[0];
695
696         /* Configure card */
697         link->state |= DEV_CONFIG;
698         i = pcmcia_get_configuration_info(handle, &config);
699         link->conf.Vcc = config.Vcc;
700
701         tuple.TupleData = (cisdata_t *)buf;
702         tuple.TupleOffset = 0;
703         tuple.TupleDataMax = 255;
704         tuple.Attributes = 0;
705         tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
706
707         /* Look for a generic full-sized window */
708         link->io.NumPorts1 = 8;
709         i = first_tuple(handle, &tuple, &parse);
710         while (i != CS_NO_MORE_ITEMS) {
711                 if ((i == CS_SUCCESS) && (cf->io.nwin == 1) && (cf->io.win[0].len > 8)) {
712                         link->conf.ConfigIndex = cf->index;
713                         link->io.BasePort1 = cf->io.win[0].base;
714                         link->io.NumPorts1 = cf->io.win[0].len; /*yo */
715                         link->io.IOAddrLines = cf->io.flags & CISTPL_IO_LINES_MASK;
716                         i = pcmcia_request_io(link->handle, &link->io);
717                         if (i == CS_SUCCESS)
718                                 break;
719                 }
720                 i = next_tuple(handle, &tuple, &parse);
721         }
722
723         if (i != CS_SUCCESS) {
724                 cs_error(link->handle, RequestIO, i);
725                 goto failed;
726         }
727
728         i = pcmcia_request_irq(link->handle, &link->irq);
729         if (i != CS_SUCCESS) {
730                 cs_error(link->handle, RequestIRQ, i);
731                 link->irq.AssignedIRQ = 0;
732         }
733
734         i = pcmcia_request_configuration(link->handle, &link->conf);
735         if (i != CS_SUCCESS) {
736                 cs_error(link->handle, RequestConfiguration, i);
737                 goto failed;
738         }
739
740         if (dtl1_open(info) != 0)
741                 goto failed;
742
743         strcpy(info->node.dev_name, info->hdev->name);
744         link->dev = &info->node;
745         link->state &= ~DEV_CONFIG_PENDING;
746
747         return;
748
749 cs_failed:
750         cs_error(link->handle, last_fn, last_ret);
751
752 failed:
753         dtl1_release(link);
754 }
755
756
757 static void dtl1_release(dev_link_t *link)
758 {
759         dtl1_info_t *info = link->priv;
760
761         if (link->state & DEV_PRESENT)
762                 dtl1_close(info);
763
764         link->dev = NULL;
765
766         pcmcia_release_configuration(link->handle);
767         pcmcia_release_io(link->handle, &link->io);
768         pcmcia_release_irq(link->handle, &link->irq);
769
770         link->state &= ~DEV_CONFIG;
771 }
772
773
774 static int dtl1_event(event_t event, int priority, event_callback_args_t *args)
775 {
776         dev_link_t *link = args->client_data;
777         dtl1_info_t *info = link->priv;
778
779         switch (event) {
780         case CS_EVENT_CARD_REMOVAL:
781                 link->state &= ~DEV_PRESENT;
782                 if (link->state & DEV_CONFIG) {
783                         dtl1_close(info);
784                         dtl1_release(link);
785                 }
786                 break;
787         case CS_EVENT_CARD_INSERTION:
788                 link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
789                 dtl1_config(link);
790                 break;
791         case CS_EVENT_PM_SUSPEND:
792                 link->state |= DEV_SUSPEND;
793                 /* Fall through... */
794         case CS_EVENT_RESET_PHYSICAL:
795                 if (link->state & DEV_CONFIG)
796                         pcmcia_release_configuration(link->handle);
797                 break;
798         case CS_EVENT_PM_RESUME:
799                 link->state &= ~DEV_SUSPEND;
800                 /* Fall through... */
801         case CS_EVENT_CARD_RESET:
802                 if (DEV_OK(link))
803                         pcmcia_request_configuration(link->handle, &link->conf);
804                 break;
805         }
806
807         return 0;
808 }
809
810 static struct pcmcia_driver dtl1_driver = {
811         .owner          = THIS_MODULE,
812         .drv            = {
813                 .name   = "dtl1_cs",
814         },
815         .attach         = dtl1_attach,
816         .detach         = dtl1_detach,
817 };
818
819 static int __init init_dtl1_cs(void)
820 {
821         return pcmcia_register_driver(&dtl1_driver);
822 }
823
824
825 static void __exit exit_dtl1_cs(void)
826 {
827         pcmcia_unregister_driver(&dtl1_driver);
828         BUG_ON(dev_list != NULL);
829 }
830
831 module_init(init_dtl1_cs);
832 module_exit(exit_dtl1_cs);