drivers: irda: fix sign bug
[linux-2.6.git] / drivers / net / irda / ksdazzle-sir.c
1 /*****************************************************************************
2 *
3 * Filename:      ksdazzle.c
4 * Version:       0.1.2
5 * Description:   Irda KingSun Dazzle USB Dongle
6 * Status:        Experimental
7 * Author:        Alex Villacís Lasso <a_villacis@palosanto.com>
8 *
9 *    Based on stir4200, mcs7780, kingsun-sir drivers.
10 *
11 *    This program is free software; you can redistribute it and/or modify
12 *    it under the terms of the GNU General Public License as published by
13 *    the Free Software Foundation; either version 2 of the License.
14 *
15 *    This program is distributed in the hope that it will be useful,
16 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
17 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 *    GNU General Public License for more details.
19 *
20 *    You should have received a copy of the GNU General Public License
21 *    along with this program; if not, write to the Free Software
22 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 *
24 *****************************************************************************/
25
26 /*
27  * Following is my most current (2007-07-26) understanding of how the Kingsun
28  * 07D0:4100 dongle (sometimes known as the MA-660) is supposed to work. This
29  * information was deduced by examining the USB traffic captured with USBSnoopy
30  * from the WinXP driver. Feel free to update here as more of the dongle is
31  * known.
32  *
33  * General: This dongle exposes one interface with two interrupt endpoints, one
34  * IN and one OUT. In this regard, it is similar to what the Kingsun/Donshine
35  * dongle (07c0:4200) exposes. Traffic is raw and needs to be wrapped and
36  * unwrapped manually as in stir4200, kingsun-sir, and ks959-sir.
37  *
38  * Transmission: To transmit an IrDA frame, it is necessary to wrap it, then
39  * split it into multiple segments of up to 7 bytes each, and transmit each in
40  * sequence. It seems that sending a single big block (like kingsun-sir does)
41  * won't work with this dongle. Each segment needs to be prefixed with a value
42  * equal to (unsigned char)0xF8 + <number of bytes in segment>, inside a payload
43  * of exactly 8 bytes. For example, a segment of 1 byte gets prefixed by 0xF9,
44  * and one of 7 bytes gets prefixed by 0xFF. The bytes at the end of the
45  * payload, not considered by the prefix, are ignored (set to 0 by this
46  * implementation).
47  *
48  * Reception: To receive data, the driver must poll the dongle regularly (like
49  * kingsun-sir.c) with interrupt URBs. If data is available, it will be returned
50  * in payloads from 0 to 8 bytes long. When concatenated, these payloads form
51  * a raw IrDA stream that needs to be unwrapped as in stir4200 and kingsun-sir
52  *
53  * Speed change: To change the speed of the dongle, the driver prepares a
54  * control URB with the following as a setup packet:
55  *    bRequestType    USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE
56  *    bRequest        0x09
57  *    wValue          0x0200
58  *    wIndex          0x0001
59  *    wLength         0x0008 (length of the payload)
60  * The payload is a 8-byte record, apparently identical to the one used in
61  * drivers/usb/serial/cypress_m8.c to change speed:
62  *     __u32 baudSpeed;
63  *    unsigned int dataBits : 2;    // 0 - 5 bits 3 - 8 bits
64  *    unsigned int : 1;
65  *    unsigned int stopBits : 1;
66  *    unsigned int parityEnable : 1;
67  *    unsigned int parityType : 1;
68  *    unsigned int : 1;
69  *    unsigned int reset : 1;
70  *    unsigned char reserved[3];    // set to 0
71  *
72  * For now only SIR speeds have been observed with this dongle. Therefore,
73  * nothing is known on what changes (if any) must be done to frame wrapping /
74  * unwrapping for higher than SIR speeds. This driver assumes no change is
75  * necessary and announces support for all the way to 115200 bps.
76  */
77
78 #include <linux/module.h>
79 #include <linux/moduleparam.h>
80 #include <linux/kernel.h>
81 #include <linux/types.h>
82 #include <linux/errno.h>
83 #include <linux/init.h>
84 #include <linux/slab.h>
85 #include <linux/usb.h>
86 #include <linux/device.h>
87 #include <linux/crc32.h>
88
89 #include <asm/unaligned.h>
90 #include <asm/byteorder.h>
91 #include <asm/uaccess.h>
92
93 #include <net/irda/irda.h>
94 #include <net/irda/wrapper.h>
95 #include <net/irda/crc.h>
96
97 #define KSDAZZLE_VENDOR_ID 0x07d0
98 #define KSDAZZLE_PRODUCT_ID 0x4100
99
100 /* These are the currently known USB ids */
101 static struct usb_device_id dongles[] = {
102         /* KingSun Co,Ltd  IrDA/USB Bridge */
103         {USB_DEVICE(KSDAZZLE_VENDOR_ID, KSDAZZLE_PRODUCT_ID)},
104         {}
105 };
106
107 MODULE_DEVICE_TABLE(usb, dongles);
108
109 #define KINGSUN_MTT 0x07
110 #define KINGSUN_REQ_RECV 0x01
111 #define KINGSUN_REQ_SEND 0x09
112
113 #define KINGSUN_SND_FIFO_SIZE    2048   /* Max packet we can send */
114 #define KINGSUN_RCV_MAX 2048    /* Max transfer we can receive */
115
116 struct ksdazzle_speedparams {
117         __le32 baudrate;        /* baud rate, little endian */
118         __u8 flags;
119         __u8 reserved[3];
120 } __packed;
121
122 #define KS_DATA_5_BITS 0x00
123 #define KS_DATA_6_BITS 0x01
124 #define KS_DATA_7_BITS 0x02
125 #define KS_DATA_8_BITS 0x03
126
127 #define KS_STOP_BITS_1 0x00
128 #define KS_STOP_BITS_2 0x08
129
130 #define KS_PAR_DISABLE    0x00
131 #define KS_PAR_EVEN    0x10
132 #define KS_PAR_ODD    0x30
133 #define KS_RESET    0x80
134
135 #define KINGSUN_EP_IN                   0
136 #define KINGSUN_EP_OUT                  1
137
138 struct ksdazzle_cb {
139         struct usb_device *usbdev;      /* init: probe_irda */
140         struct net_device *netdev;      /* network layer */
141         struct irlap_cb *irlap; /* The link layer we are binded to */
142
143         struct qos_info qos;
144
145         struct urb *tx_urb;
146         __u8 *tx_buf_clear;
147         unsigned int tx_buf_clear_used;
148         unsigned int tx_buf_clear_sent;
149         __u8 tx_payload[8];
150
151         struct urb *rx_urb;
152         __u8 *rx_buf;
153         iobuff_t rx_unwrap_buff;
154
155         struct usb_ctrlrequest *speed_setuprequest;
156         struct urb *speed_urb;
157         struct ksdazzle_speedparams speedparams;
158         unsigned int new_speed;
159
160         __u8 ep_in;
161         __u8 ep_out;
162
163         spinlock_t lock;
164         int receiving;
165 };
166
167 /* Callback transmission routine */
168 static void ksdazzle_speed_irq(struct urb *urb)
169 {
170         /* unlink, shutdown, unplug, other nasties */
171         if (urb->status != 0) {
172                 err("ksdazzle_speed_irq: urb asynchronously failed - %d",
173                     urb->status);
174         }
175 }
176
177 /* Send a control request to change speed of the dongle */
178 static int ksdazzle_change_speed(struct ksdazzle_cb *kingsun, unsigned speed)
179 {
180         static unsigned int supported_speeds[] = { 2400, 9600, 19200, 38400,
181                 57600, 115200, 576000, 1152000, 4000000, 0
182         };
183         int err;
184         unsigned int i;
185
186         if (kingsun->speed_setuprequest == NULL || kingsun->speed_urb == NULL)
187                 return -ENOMEM;
188
189         /* Check that requested speed is among the supported ones */
190         for (i = 0; supported_speeds[i] && supported_speeds[i] != speed; i++) ;
191         if (supported_speeds[i] == 0)
192                 return -EOPNOTSUPP;
193
194         memset(&(kingsun->speedparams), 0, sizeof(struct ksdazzle_speedparams));
195         kingsun->speedparams.baudrate = cpu_to_le32(speed);
196         kingsun->speedparams.flags = KS_DATA_8_BITS;
197
198         /* speed_setuprequest pre-filled in ksdazzle_probe */
199         usb_fill_control_urb(kingsun->speed_urb, kingsun->usbdev,
200                              usb_sndctrlpipe(kingsun->usbdev, 0),
201                              (unsigned char *)kingsun->speed_setuprequest,
202                              &(kingsun->speedparams),
203                              sizeof(struct ksdazzle_speedparams),
204                              ksdazzle_speed_irq, kingsun);
205         kingsun->speed_urb->status = 0;
206         err = usb_submit_urb(kingsun->speed_urb, GFP_ATOMIC);
207
208         return err;
209 }
210
211 /* Submit one fragment of an IrDA frame to the dongle */
212 static void ksdazzle_send_irq(struct urb *urb);
213 static int ksdazzle_submit_tx_fragment(struct ksdazzle_cb *kingsun)
214 {
215         unsigned int wraplen;
216         int ret;
217
218         /* We can send at most 7 bytes of payload at a time */
219         wraplen = 7;
220         if (wraplen > kingsun->tx_buf_clear_used)
221                 wraplen = kingsun->tx_buf_clear_used;
222
223         /* Prepare payload prefix with used length */
224         memset(kingsun->tx_payload, 0, 8);
225         kingsun->tx_payload[0] = (unsigned char)0xf8 + wraplen;
226         memcpy(kingsun->tx_payload + 1, kingsun->tx_buf_clear, wraplen);
227
228         usb_fill_int_urb(kingsun->tx_urb, kingsun->usbdev,
229                          usb_sndintpipe(kingsun->usbdev, kingsun->ep_out),
230                          kingsun->tx_payload, 8, ksdazzle_send_irq, kingsun, 1);
231         kingsun->tx_urb->status = 0;
232         ret = usb_submit_urb(kingsun->tx_urb, GFP_ATOMIC);
233
234         /* Remember how much data was sent, in order to update at callback */
235         kingsun->tx_buf_clear_sent = (ret == 0) ? wraplen : 0;
236         return ret;
237 }
238
239 /* Callback transmission routine */
240 static void ksdazzle_send_irq(struct urb *urb)
241 {
242         struct ksdazzle_cb *kingsun = urb->context;
243         struct net_device *netdev = kingsun->netdev;
244         int ret = 0;
245
246         /* in process of stopping, just drop data */
247         if (!netif_running(kingsun->netdev)) {
248                 err("ksdazzle_send_irq: Network not running!");
249                 return;
250         }
251
252         /* unlink, shutdown, unplug, other nasties */
253         if (urb->status != 0) {
254                 err("ksdazzle_send_irq: urb asynchronously failed - %d",
255                     urb->status);
256                 return;
257         }
258
259         if (kingsun->tx_buf_clear_used > 0) {
260                 /* Update data remaining to be sent */
261                 if (kingsun->tx_buf_clear_sent < kingsun->tx_buf_clear_used) {
262                         memmove(kingsun->tx_buf_clear,
263                                 kingsun->tx_buf_clear +
264                                 kingsun->tx_buf_clear_sent,
265                                 kingsun->tx_buf_clear_used -
266                                 kingsun->tx_buf_clear_sent);
267                 }
268                 kingsun->tx_buf_clear_used -= kingsun->tx_buf_clear_sent;
269                 kingsun->tx_buf_clear_sent = 0;
270
271                 if (kingsun->tx_buf_clear_used > 0) {
272                         /* There is more data to be sent */
273                         if ((ret = ksdazzle_submit_tx_fragment(kingsun)) != 0) {
274                                 err("ksdazzle_send_irq: failed tx_urb submit: %d", ret);
275                                 switch (ret) {
276                                 case -ENODEV:
277                                 case -EPIPE:
278                                         break;
279                                 default:
280                                         netdev->stats.tx_errors++;
281                                         netif_start_queue(netdev);
282                                 }
283                         }
284                 } else {
285                         /* All data sent, send next speed && wake network queue */
286                         if (kingsun->new_speed != -1 &&
287                             cpu_to_le32(kingsun->new_speed) !=
288                             kingsun->speedparams.baudrate)
289                                 ksdazzle_change_speed(kingsun,
290                                                       kingsun->new_speed);
291
292                         netif_wake_queue(netdev);
293                 }
294         }
295 }
296
297 /*
298  * Called from net/core when new frame is available.
299  */
300 static netdev_tx_t ksdazzle_hard_xmit(struct sk_buff *skb,
301                                             struct net_device *netdev)
302 {
303         struct ksdazzle_cb *kingsun;
304         unsigned int wraplen;
305         int ret = 0;
306
307         netif_stop_queue(netdev);
308
309         /* the IRDA wrapping routines don't deal with non linear skb */
310         SKB_LINEAR_ASSERT(skb);
311
312         kingsun = netdev_priv(netdev);
313
314         spin_lock(&kingsun->lock);
315         kingsun->new_speed = irda_get_next_speed(skb);
316
317         /* Append data to the end of whatever data remains to be transmitted */
318         wraplen =
319             async_wrap_skb(skb, kingsun->tx_buf_clear, KINGSUN_SND_FIFO_SIZE);
320         kingsun->tx_buf_clear_used = wraplen;
321
322         if ((ret = ksdazzle_submit_tx_fragment(kingsun)) != 0) {
323                 err("ksdazzle_hard_xmit: failed tx_urb submit: %d", ret);
324                 switch (ret) {
325                 case -ENODEV:
326                 case -EPIPE:
327                         break;
328                 default:
329                         netdev->stats.tx_errors++;
330                         netif_start_queue(netdev);
331                 }
332         } else {
333                 netdev->stats.tx_packets++;
334                 netdev->stats.tx_bytes += skb->len;
335
336         }
337
338         dev_kfree_skb(skb);
339         spin_unlock(&kingsun->lock);
340
341         return NETDEV_TX_OK;
342 }
343
344 /* Receive callback function */
345 static void ksdazzle_rcv_irq(struct urb *urb)
346 {
347         struct ksdazzle_cb *kingsun = urb->context;
348         struct net_device *netdev = kingsun->netdev;
349
350         /* in process of stopping, just drop data */
351         if (!netif_running(netdev)) {
352                 kingsun->receiving = 0;
353                 return;
354         }
355
356         /* unlink, shutdown, unplug, other nasties */
357         if (urb->status != 0) {
358                 err("ksdazzle_rcv_irq: urb asynchronously failed - %d",
359                     urb->status);
360                 kingsun->receiving = 0;
361                 return;
362         }
363
364         if (urb->actual_length > 0) {
365                 __u8 *bytes = urb->transfer_buffer;
366                 unsigned int i;
367
368                 for (i = 0; i < urb->actual_length; i++) {
369                         async_unwrap_char(netdev, &netdev->stats,
370                                           &kingsun->rx_unwrap_buff, bytes[i]);
371                 }
372                 kingsun->receiving =
373                     (kingsun->rx_unwrap_buff.state != OUTSIDE_FRAME) ? 1 : 0;
374         }
375
376         /* This urb has already been filled in ksdazzle_net_open. It is assumed that
377            urb keeps the pointer to the payload buffer.
378          */
379         urb->status = 0;
380         usb_submit_urb(urb, GFP_ATOMIC);
381 }
382
383 /*
384  * Function ksdazzle_net_open (dev)
385  *
386  *    Network device is taken up. Usually this is done by "ifconfig irda0 up"
387  */
388 static int ksdazzle_net_open(struct net_device *netdev)
389 {
390         struct ksdazzle_cb *kingsun = netdev_priv(netdev);
391         int err = -ENOMEM;
392         char hwname[16];
393
394         /* At this point, urbs are NULL, and skb is NULL (see ksdazzle_probe) */
395         kingsun->receiving = 0;
396
397         /* Initialize for SIR to copy data directly into skb.  */
398         kingsun->rx_unwrap_buff.in_frame = FALSE;
399         kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
400         kingsun->rx_unwrap_buff.truesize = IRDA_SKB_MAX_MTU;
401         kingsun->rx_unwrap_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
402         if (!kingsun->rx_unwrap_buff.skb)
403                 goto free_mem;
404
405         skb_reserve(kingsun->rx_unwrap_buff.skb, 1);
406         kingsun->rx_unwrap_buff.head = kingsun->rx_unwrap_buff.skb->data;
407
408         kingsun->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
409         if (!kingsun->rx_urb)
410                 goto free_mem;
411
412         kingsun->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
413         if (!kingsun->tx_urb)
414                 goto free_mem;
415
416         kingsun->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
417         if (!kingsun->speed_urb)
418                 goto free_mem;
419
420         /* Initialize speed for dongle */
421         kingsun->new_speed = 9600;
422         err = ksdazzle_change_speed(kingsun, 9600);
423         if (err < 0)
424                 goto free_mem;
425
426         /*
427          * Now that everything should be initialized properly,
428          * Open new IrLAP layer instance to take care of us...
429          */
430         sprintf(hwname, "usb#%d", kingsun->usbdev->devnum);
431         kingsun->irlap = irlap_open(netdev, &kingsun->qos, hwname);
432         if (!kingsun->irlap) {
433                 err("ksdazzle-sir: irlap_open failed");
434                 goto free_mem;
435         }
436
437         /* Start reception. */
438         usb_fill_int_urb(kingsun->rx_urb, kingsun->usbdev,
439                          usb_rcvintpipe(kingsun->usbdev, kingsun->ep_in),
440                          kingsun->rx_buf, KINGSUN_RCV_MAX, ksdazzle_rcv_irq,
441                          kingsun, 1);
442         kingsun->rx_urb->status = 0;
443         err = usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
444         if (err) {
445                 err("ksdazzle-sir: first urb-submit failed: %d", err);
446                 goto close_irlap;
447         }
448
449         netif_start_queue(netdev);
450
451         /* Situation at this point:
452            - all work buffers allocated
453            - urbs allocated and ready to fill
454            - max rx packet known (in max_rx)
455            - unwrap state machine initialized, in state outside of any frame
456            - receive request in progress
457            - IrLAP layer started, about to hand over packets to send
458          */
459
460         return 0;
461
462       close_irlap:
463         irlap_close(kingsun->irlap);
464       free_mem:
465         usb_free_urb(kingsun->speed_urb);
466         kingsun->speed_urb = NULL;
467         usb_free_urb(kingsun->tx_urb);
468         kingsun->tx_urb = NULL;
469         usb_free_urb(kingsun->rx_urb);
470         kingsun->rx_urb = NULL;
471         if (kingsun->rx_unwrap_buff.skb) {
472                 kfree_skb(kingsun->rx_unwrap_buff.skb);
473                 kingsun->rx_unwrap_buff.skb = NULL;
474                 kingsun->rx_unwrap_buff.head = NULL;
475         }
476         return err;
477 }
478
479 /*
480  * Function ksdazzle_net_close (dev)
481  *
482  *    Network device is taken down. Usually this is done by
483  *    "ifconfig irda0 down"
484  */
485 static int ksdazzle_net_close(struct net_device *netdev)
486 {
487         struct ksdazzle_cb *kingsun = netdev_priv(netdev);
488
489         /* Stop transmit processing */
490         netif_stop_queue(netdev);
491
492         /* Mop up receive && transmit urb's */
493         usb_kill_urb(kingsun->tx_urb);
494         usb_free_urb(kingsun->tx_urb);
495         kingsun->tx_urb = NULL;
496
497         usb_kill_urb(kingsun->speed_urb);
498         usb_free_urb(kingsun->speed_urb);
499         kingsun->speed_urb = NULL;
500
501         usb_kill_urb(kingsun->rx_urb);
502         usb_free_urb(kingsun->rx_urb);
503         kingsun->rx_urb = NULL;
504
505         kfree_skb(kingsun->rx_unwrap_buff.skb);
506         kingsun->rx_unwrap_buff.skb = NULL;
507         kingsun->rx_unwrap_buff.head = NULL;
508         kingsun->rx_unwrap_buff.in_frame = FALSE;
509         kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
510         kingsun->receiving = 0;
511
512         /* Stop and remove instance of IrLAP */
513         irlap_close(kingsun->irlap);
514
515         kingsun->irlap = NULL;
516
517         return 0;
518 }
519
520 /*
521  * IOCTLs : Extra out-of-band network commands...
522  */
523 static int ksdazzle_net_ioctl(struct net_device *netdev, struct ifreq *rq,
524                               int cmd)
525 {
526         struct if_irda_req *irq = (struct if_irda_req *)rq;
527         struct ksdazzle_cb *kingsun = netdev_priv(netdev);
528         int ret = 0;
529
530         switch (cmd) {
531         case SIOCSBANDWIDTH:    /* Set bandwidth */
532                 if (!capable(CAP_NET_ADMIN))
533                         return -EPERM;
534
535                 /* Check if the device is still there */
536                 if (netif_device_present(kingsun->netdev))
537                         return ksdazzle_change_speed(kingsun,
538                                                      irq->ifr_baudrate);
539                 break;
540
541         case SIOCSMEDIABUSY:    /* Set media busy */
542                 if (!capable(CAP_NET_ADMIN))
543                         return -EPERM;
544
545                 /* Check if the IrDA stack is still there */
546                 if (netif_running(kingsun->netdev))
547                         irda_device_set_media_busy(kingsun->netdev, TRUE);
548                 break;
549
550         case SIOCGRECEIVING:
551                 /* Only approximately true */
552                 irq->ifr_receiving = kingsun->receiving;
553                 break;
554
555         default:
556                 ret = -EOPNOTSUPP;
557         }
558
559         return ret;
560 }
561
562 static const struct net_device_ops ksdazzle_ops = {
563         .ndo_start_xmit = ksdazzle_hard_xmit,
564         .ndo_open       = ksdazzle_net_open,
565         .ndo_stop       = ksdazzle_net_close,
566         .ndo_do_ioctl   = ksdazzle_net_ioctl,
567 };
568
569 /*
570  * This routine is called by the USB subsystem for each new device
571  * in the system. We need to check if the device is ours, and in
572  * this case start handling it.
573  */
574 static int ksdazzle_probe(struct usb_interface *intf,
575                           const struct usb_device_id *id)
576 {
577         struct usb_host_interface *interface;
578         struct usb_endpoint_descriptor *endpoint;
579
580         struct usb_device *dev = interface_to_usbdev(intf);
581         struct ksdazzle_cb *kingsun = NULL;
582         struct net_device *net = NULL;
583         int ret = -ENOMEM;
584         int pipe, maxp_in, maxp_out;
585         __u8 ep_in;
586         __u8 ep_out;
587
588         /* Check that there really are two interrupt endpoints. Check based on the
589            one in drivers/usb/input/usbmouse.c
590          */
591         interface = intf->cur_altsetting;
592         if (interface->desc.bNumEndpoints != 2) {
593                 err("ksdazzle: expected 2 endpoints, found %d",
594                     interface->desc.bNumEndpoints);
595                 return -ENODEV;
596         }
597         endpoint = &interface->endpoint[KINGSUN_EP_IN].desc;
598         if (!usb_endpoint_is_int_in(endpoint)) {
599                 err("ksdazzle: endpoint 0 is not interrupt IN");
600                 return -ENODEV;
601         }
602
603         ep_in = endpoint->bEndpointAddress;
604         pipe = usb_rcvintpipe(dev, ep_in);
605         maxp_in = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
606         if (maxp_in > 255 || maxp_in <= 1) {
607                 err("ksdazzle: endpoint 0 has max packet size %d not in range [2..255]", maxp_in);
608                 return -ENODEV;
609         }
610
611         endpoint = &interface->endpoint[KINGSUN_EP_OUT].desc;
612         if (!usb_endpoint_is_int_out(endpoint)) {
613                 err("ksdazzle: endpoint 1 is not interrupt OUT");
614                 return -ENODEV;
615         }
616
617         ep_out = endpoint->bEndpointAddress;
618         pipe = usb_sndintpipe(dev, ep_out);
619         maxp_out = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
620
621         /* Allocate network device container. */
622         net = alloc_irdadev(sizeof(*kingsun));
623         if (!net)
624                 goto err_out1;
625
626         SET_NETDEV_DEV(net, &intf->dev);
627         kingsun = netdev_priv(net);
628         kingsun->netdev = net;
629         kingsun->usbdev = dev;
630         kingsun->ep_in = ep_in;
631         kingsun->ep_out = ep_out;
632         kingsun->irlap = NULL;
633         kingsun->tx_urb = NULL;
634         kingsun->tx_buf_clear = NULL;
635         kingsun->tx_buf_clear_used = 0;
636         kingsun->tx_buf_clear_sent = 0;
637
638         kingsun->rx_urb = NULL;
639         kingsun->rx_buf = NULL;
640         kingsun->rx_unwrap_buff.in_frame = FALSE;
641         kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
642         kingsun->rx_unwrap_buff.skb = NULL;
643         kingsun->receiving = 0;
644         spin_lock_init(&kingsun->lock);
645
646         kingsun->speed_setuprequest = NULL;
647         kingsun->speed_urb = NULL;
648         kingsun->speedparams.baudrate = 0;
649
650         /* Allocate input buffer */
651         kingsun->rx_buf = kmalloc(KINGSUN_RCV_MAX, GFP_KERNEL);
652         if (!kingsun->rx_buf)
653                 goto free_mem;
654
655         /* Allocate output buffer */
656         kingsun->tx_buf_clear = kmalloc(KINGSUN_SND_FIFO_SIZE, GFP_KERNEL);
657         if (!kingsun->tx_buf_clear)
658                 goto free_mem;
659
660         /* Allocate and initialize speed setup packet */
661         kingsun->speed_setuprequest =
662             kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
663         if (!kingsun->speed_setuprequest)
664                 goto free_mem;
665         kingsun->speed_setuprequest->bRequestType =
666             USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
667         kingsun->speed_setuprequest->bRequest = KINGSUN_REQ_SEND;
668         kingsun->speed_setuprequest->wValue = cpu_to_le16(0x0200);
669         kingsun->speed_setuprequest->wIndex = cpu_to_le16(0x0001);
670         kingsun->speed_setuprequest->wLength =
671             cpu_to_le16(sizeof(struct ksdazzle_speedparams));
672
673         printk(KERN_INFO "KingSun/Dazzle IRDA/USB found at address %d, "
674                "Vendor: %x, Product: %x\n",
675                dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
676                le16_to_cpu(dev->descriptor.idProduct));
677
678         /* Initialize QoS for this device */
679         irda_init_max_qos_capabilies(&kingsun->qos);
680
681         /* Baud rates known to be supported. Please uncomment if devices (other
682            than a SonyEriccson K300 phone) can be shown to support higher speeds
683            with this dongle.
684          */
685         kingsun->qos.baud_rate.bits =
686             IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200;
687         kingsun->qos.min_turn_time.bits &= KINGSUN_MTT;
688         irda_qos_bits_to_value(&kingsun->qos);
689
690         /* Override the network functions we need to use */
691         net->netdev_ops = &ksdazzle_ops;
692
693         ret = register_netdev(net);
694         if (ret != 0)
695                 goto free_mem;
696
697         dev_info(&net->dev, "IrDA: Registered KingSun/Dazzle device %s\n",
698                  net->name);
699
700         usb_set_intfdata(intf, kingsun);
701
702         /* Situation at this point:
703            - all work buffers allocated
704            - setup requests pre-filled
705            - urbs not allocated, set to NULL
706            - max rx packet known (is KINGSUN_FIFO_SIZE)
707            - unwrap state machine (partially) initialized, but skb == NULL
708          */
709
710         return 0;
711
712       free_mem:
713         kfree(kingsun->speed_setuprequest);
714         kfree(kingsun->tx_buf_clear);
715         kfree(kingsun->rx_buf);
716         free_netdev(net);
717       err_out1:
718         return ret;
719 }
720
721 /*
722  * The current device is removed, the USB layer tell us to shut it down...
723  */
724 static void ksdazzle_disconnect(struct usb_interface *intf)
725 {
726         struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
727
728         if (!kingsun)
729                 return;
730
731         unregister_netdev(kingsun->netdev);
732
733         /* Mop up receive && transmit urb's */
734         usb_kill_urb(kingsun->speed_urb);
735         usb_free_urb(kingsun->speed_urb);
736         kingsun->speed_urb = NULL;
737
738         usb_kill_urb(kingsun->tx_urb);
739         usb_free_urb(kingsun->tx_urb);
740         kingsun->tx_urb = NULL;
741
742         usb_kill_urb(kingsun->rx_urb);
743         usb_free_urb(kingsun->rx_urb);
744         kingsun->rx_urb = NULL;
745
746         kfree(kingsun->speed_setuprequest);
747         kfree(kingsun->tx_buf_clear);
748         kfree(kingsun->rx_buf);
749         free_netdev(kingsun->netdev);
750
751         usb_set_intfdata(intf, NULL);
752 }
753
754 #ifdef CONFIG_PM
755 /* USB suspend, so power off the transmitter/receiver */
756 static int ksdazzle_suspend(struct usb_interface *intf, pm_message_t message)
757 {
758         struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
759
760         netif_device_detach(kingsun->netdev);
761         if (kingsun->speed_urb != NULL)
762                 usb_kill_urb(kingsun->speed_urb);
763         if (kingsun->tx_urb != NULL)
764                 usb_kill_urb(kingsun->tx_urb);
765         if (kingsun->rx_urb != NULL)
766                 usb_kill_urb(kingsun->rx_urb);
767         return 0;
768 }
769
770 /* Coming out of suspend, so reset hardware */
771 static int ksdazzle_resume(struct usb_interface *intf)
772 {
773         struct ksdazzle_cb *kingsun = usb_get_intfdata(intf);
774
775         if (kingsun->rx_urb != NULL) {
776                 /* Setup request already filled in ksdazzle_probe */
777                 usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
778         }
779         netif_device_attach(kingsun->netdev);
780
781         return 0;
782 }
783 #endif
784
785 /*
786  * USB device callbacks
787  */
788 static struct usb_driver irda_driver = {
789         .name = "ksdazzle-sir",
790         .probe = ksdazzle_probe,
791         .disconnect = ksdazzle_disconnect,
792         .id_table = dongles,
793 #ifdef CONFIG_PM
794         .suspend = ksdazzle_suspend,
795         .resume = ksdazzle_resume,
796 #endif
797 };
798
799 /*
800  * Module insertion
801  */
802 static int __init ksdazzle_init(void)
803 {
804         return usb_register(&irda_driver);
805 }
806
807 module_init(ksdazzle_init);
808
809 /*
810  * Module removal
811  */
812 static void __exit ksdazzle_cleanup(void)
813 {
814         /* Deregister the driver and remove all pending instances */
815         usb_deregister(&irda_driver);
816 }
817
818 module_exit(ksdazzle_cleanup);
819
820 MODULE_AUTHOR("Alex Villacís Lasso <a_villacis@palosanto.com>");
821 MODULE_DESCRIPTION("IrDA-USB Dongle Driver for KingSun Dazzle");
822 MODULE_LICENSE("GPL");