1 /*****************************************************************************
3 * Filename: ks959-sir.c
5 * Description: Irda KingSun KS-959 USB Dongle
7 * Author: Alex Villacís Lasso <a_villacis@palosanto.com>
8 * with help from Domen Puncer <domen@coderock.org>
10 * Based on stir4200, mcs7780, kingsun-sir drivers.
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *****************************************************************************/
28 * Following is my most current (2007-07-17) understanding of how the Kingsun
29 * KS-959 dongle is supposed to work. This information was deduced by
30 * reverse-engineering and examining the USB traffic captured with USBSnoopy
31 * from the WinXP driver. Feel free to update here as more of the dongle is
34 * My most sincere thanks must go to Domen Puncer <domen@coderock.org> for
35 * invaluable help in cracking the obfuscation and padding required for this
38 * General: This dongle exposes one interface with one interrupt IN endpoint.
39 * However, the interrupt endpoint is NOT used at all for this dongle. Instead,
40 * this dongle uses control transfers for everything, including sending and
41 * receiving the IrDA frame data. Apparently the interrupt endpoint is just a
42 * dummy to ensure the dongle has a valid interface to present to the PC.And I
43 * thought the DonShine dongle was weird... In addition, this dongle uses
44 * obfuscation (?!?!), applied at the USB level, to hide the traffic, both sent
45 * and received, from the dongle. I call it obfuscation because the XOR keying
46 * and padding required to produce an USB traffic acceptable for the dongle can
47 * not be explained by any other technical requirement.
49 * Transmission: To transmit an IrDA frame, the driver must prepare a control
50 * URB with the following as a setup packet:
51 * bRequestType USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE
53 * wValue <length of valid data before padding, little endian>
55 * wLength <length of padded data>
56 * The payload packet must be manually wrapped and escaped (as in stir4200.c),
57 * then padded and obfuscated before being sent. Both padding and obfuscation
58 * are implemented in the procedure obfuscate_tx_buffer(). Suffice to say, the
59 * designer/programmer of the dongle used his name as a source for the
61 * Apparently the dongle cannot handle payloads larger than 256 bytes. The
62 * driver has to perform fragmentation in order to send anything larger than
65 * Reception: To receive data, the driver must poll the dongle regularly (like
66 * kingsun-sir.c) with control URBs and the following as a setup packet:
67 * bRequestType USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE
71 * wLength 0x0800 (size of available buffer)
72 * If there is data to be read, it will be returned as the response payload.
73 * This data is (apparently) not padded, but it is obfuscated. To de-obfuscate
74 * it, the driver must XOR every byte, in sequence, with a value that starts at
75 * 1 and is incremented with each byte processed, and then with 0x55. The value
76 * incremented with each byte processed overflows as an unsigned char. The
77 * resulting bytes form a wrapped SIR frame that is unwrapped and unescaped
78 * as in stir4200.c The incremented value is NOT reset with each frame, but is
79 * kept across the entire session with the dongle. Also, the dongle inserts an
80 * extra garbage byte with value 0x95 (after decoding) every 0xff bytes, which
83 * Speed change: To change the speed of the dongle, the driver prepares a
84 * control URB with the following as a setup packet:
85 * bRequestType USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE
89 * wLength 0x0008 (length of the payload)
90 * The payload is a 8-byte record, apparently identical to the one used in
91 * drivers/usb/serial/cypress_m8.c to change speed:
93 * unsigned int dataBits : 2; // 0 - 5 bits 3 - 8 bits
95 * unsigned int stopBits : 1;
96 * unsigned int parityEnable : 1;
97 * unsigned int parityType : 1;
99 * unsigned int reset : 1;
100 * unsigned char reserved[3]; // set to 0
102 * For now only SIR speeds have been observed with this dongle. Therefore,
103 * nothing is known on what changes (if any) must be done to frame wrapping /
104 * unwrapping for higher than SIR speeds. This driver assumes no change is
105 * necessary and announces support for all the way to 57600 bps. Although the
106 * package announces support for up to 4MBps, tests with a Sony Ericcson K300
107 * phone show corruption when receiving large frames at 115200 bps, the highest
108 * speed announced by the phone. However, transmission at 115200 bps is OK. Go
109 * figure. Since I don't know whether the phone or the dongle is at fault, max
110 * announced speed is 57600 bps until someone produces a device that can run
111 * at higher speeds with this dongle.
114 #include <linux/module.h>
115 #include <linux/moduleparam.h>
116 #include <linux/kernel.h>
117 #include <linux/types.h>
118 #include <linux/errno.h>
119 #include <linux/init.h>
120 #include <linux/slab.h>
121 #include <linux/usb.h>
122 #include <linux/device.h>
123 #include <linux/crc32.h>
125 #include <asm/unaligned.h>
126 #include <asm/byteorder.h>
127 #include <asm/uaccess.h>
129 #include <net/irda/irda.h>
130 #include <net/irda/wrapper.h>
131 #include <net/irda/crc.h>
133 #define KS959_VENDOR_ID 0x07d0
134 #define KS959_PRODUCT_ID 0x4959
136 /* These are the currently known USB ids */
137 static struct usb_device_id dongles[] = {
138 /* KingSun Co,Ltd IrDA/USB Bridge */
139 {USB_DEVICE(KS959_VENDOR_ID, KS959_PRODUCT_ID)},
143 MODULE_DEVICE_TABLE(usb, dongles);
145 #define KINGSUN_MTT 0x07
146 #define KINGSUN_REQ_RECV 0x01
147 #define KINGSUN_REQ_SEND 0x09
149 #define KINGSUN_RCV_FIFO_SIZE 2048 /* Max length we can receive */
150 #define KINGSUN_SND_FIFO_SIZE 2048 /* Max packet we can send */
151 #define KINGSUN_SND_PACKET_SIZE 256 /* Max packet dongle can handle */
153 struct ks959_speedparams {
154 __le32 baudrate; /* baud rate, little endian */
159 #define KS_DATA_5_BITS 0x00
160 #define KS_DATA_6_BITS 0x01
161 #define KS_DATA_7_BITS 0x02
162 #define KS_DATA_8_BITS 0x03
164 #define KS_STOP_BITS_1 0x00
165 #define KS_STOP_BITS_2 0x08
167 #define KS_PAR_DISABLE 0x00
168 #define KS_PAR_EVEN 0x10
169 #define KS_PAR_ODD 0x30
170 #define KS_RESET 0x80
173 struct usb_device *usbdev; /* init: probe_irda */
174 struct net_device *netdev; /* network layer */
175 struct irlap_cb *irlap; /* The link layer we are binded to */
179 struct usb_ctrlrequest *tx_setuprequest;
182 unsigned int tx_buf_clear_used;
183 unsigned int tx_buf_clear_sent;
186 struct usb_ctrlrequest *rx_setuprequest;
189 __u8 rx_variable_xormask;
190 iobuff_t rx_unwrap_buff;
191 struct timeval rx_time;
193 struct usb_ctrlrequest *speed_setuprequest;
194 struct urb *speed_urb;
195 struct ks959_speedparams speedparams;
196 unsigned int new_speed;
202 /* Procedure to perform the obfuscation/padding expected by the dongle
204 * buf_cleartext (IN) Cleartext version of the IrDA frame to transmit
205 * len_cleartext (IN) Length of the cleartext version of IrDA frame
206 * buf_xoredtext (OUT) Obfuscated version of frame built by proc
207 * len_maxbuf (OUT) Maximum space available at buf_xoredtext
209 * (return) length of obfuscated frame with padding
211 * If not enough space (as indicated by len_maxbuf vs. required padding),
214 * The value of lookup_string is actually a required portion of the algorithm.
215 * Seems the designer of the dongle wanted to state who exactly is responsible
216 * for implementing obfuscation. Send your best (or other) wishes to him ]:-)
218 static unsigned int obfuscate_tx_buffer(const __u8 * buf_cleartext,
219 unsigned int len_cleartext,
220 __u8 * buf_xoredtext,
221 unsigned int len_maxbuf)
223 unsigned int len_xoredtext;
225 /* Calculate required length with padding, check for necessary space */
226 len_xoredtext = ((len_cleartext + 7) & ~0x7) + 0x10;
227 if (len_xoredtext <= len_maxbuf) {
228 static const __u8 lookup_string[] = "wangshuofei19710";
231 /* Unlike the WinXP driver, we *do* clear out the padding */
232 memset(buf_xoredtext, 0, len_xoredtext);
234 xor_mask = lookup_string[(len_cleartext & 0x0f) ^ 0x06] ^ 0x55;
236 while (len_cleartext-- > 0) {
237 *buf_xoredtext++ = *buf_cleartext++ ^ xor_mask;
242 return len_xoredtext;
245 /* Callback transmission routine */
246 static void ks959_speed_irq(struct urb *urb)
248 /* unlink, shutdown, unplug, other nasties */
249 if (urb->status != 0) {
250 dev_err(&urb->dev->dev,
251 "ks959_speed_irq: urb asynchronously failed - %d\n",
256 /* Send a control request to change speed of the dongle */
257 static int ks959_change_speed(struct ks959_cb *kingsun, unsigned speed)
259 static unsigned int supported_speeds[] = { 2400, 9600, 19200, 38400,
260 57600, 115200, 576000, 1152000, 4000000, 0
265 if (kingsun->speed_setuprequest == NULL || kingsun->speed_urb == NULL)
268 /* Check that requested speed is among the supported ones */
269 for (i = 0; supported_speeds[i] && supported_speeds[i] != speed; i++) ;
270 if (supported_speeds[i] == 0)
273 memset(&(kingsun->speedparams), 0, sizeof(struct ks959_speedparams));
274 kingsun->speedparams.baudrate = cpu_to_le32(speed);
275 kingsun->speedparams.flags = KS_DATA_8_BITS;
277 /* speed_setuprequest pre-filled in ks959_probe */
278 usb_fill_control_urb(kingsun->speed_urb, kingsun->usbdev,
279 usb_sndctrlpipe(kingsun->usbdev, 0),
280 (unsigned char *)kingsun->speed_setuprequest,
281 &(kingsun->speedparams),
282 sizeof(struct ks959_speedparams), ks959_speed_irq,
284 kingsun->speed_urb->status = 0;
285 err = usb_submit_urb(kingsun->speed_urb, GFP_ATOMIC);
290 /* Submit one fragment of an IrDA frame to the dongle */
291 static void ks959_send_irq(struct urb *urb);
292 static int ks959_submit_tx_fragment(struct ks959_cb *kingsun)
295 unsigned int wraplen;
298 /* Check whether current plaintext can produce a padded buffer that fits
299 within the range handled by the dongle */
300 wraplen = (KINGSUN_SND_PACKET_SIZE & ~0x7) - 0x10;
301 if (wraplen > kingsun->tx_buf_clear_used)
302 wraplen = kingsun->tx_buf_clear_used;
304 /* Perform dongle obfuscation. Also remove the portion of the frame that
305 was just obfuscated and will now be sent to the dongle. */
306 padlen = obfuscate_tx_buffer(kingsun->tx_buf_clear, wraplen,
307 kingsun->tx_buf_xored,
308 KINGSUN_SND_PACKET_SIZE);
310 /* Calculate how much data can be transmitted in this urb */
311 kingsun->tx_setuprequest->wValue = cpu_to_le16(wraplen);
312 kingsun->tx_setuprequest->wLength = cpu_to_le16(padlen);
313 /* Rest of the fields were filled in ks959_probe */
314 usb_fill_control_urb(kingsun->tx_urb, kingsun->usbdev,
315 usb_sndctrlpipe(kingsun->usbdev, 0),
316 (unsigned char *)kingsun->tx_setuprequest,
317 kingsun->tx_buf_xored, padlen,
318 ks959_send_irq, kingsun);
319 kingsun->tx_urb->status = 0;
320 ret = usb_submit_urb(kingsun->tx_urb, GFP_ATOMIC);
322 /* Remember how much data was sent, in order to update at callback */
323 kingsun->tx_buf_clear_sent = (ret == 0) ? wraplen : 0;
327 /* Callback transmission routine */
328 static void ks959_send_irq(struct urb *urb)
330 struct ks959_cb *kingsun = urb->context;
331 struct net_device *netdev = kingsun->netdev;
334 /* in process of stopping, just drop data */
335 if (!netif_running(kingsun->netdev)) {
336 dev_err(&kingsun->usbdev->dev,
337 "ks959_send_irq: Network not running!\n");
341 /* unlink, shutdown, unplug, other nasties */
342 if (urb->status != 0) {
343 dev_err(&kingsun->usbdev->dev,
344 "ks959_send_irq: urb asynchronously failed - %d\n",
349 if (kingsun->tx_buf_clear_used > 0) {
350 /* Update data remaining to be sent */
351 if (kingsun->tx_buf_clear_sent < kingsun->tx_buf_clear_used) {
352 memmove(kingsun->tx_buf_clear,
353 kingsun->tx_buf_clear +
354 kingsun->tx_buf_clear_sent,
355 kingsun->tx_buf_clear_used -
356 kingsun->tx_buf_clear_sent);
358 kingsun->tx_buf_clear_used -= kingsun->tx_buf_clear_sent;
359 kingsun->tx_buf_clear_sent = 0;
361 if (kingsun->tx_buf_clear_used > 0) {
362 /* There is more data to be sent */
363 if ((ret = ks959_submit_tx_fragment(kingsun)) != 0) {
364 dev_err(&kingsun->usbdev->dev,
365 "ks959_send_irq: failed tx_urb submit: %d\n",
372 netdev->stats.tx_errors++;
373 netif_start_queue(netdev);
377 /* All data sent, send next speed && wake network queue */
378 if (kingsun->new_speed != -1 &&
379 cpu_to_le32(kingsun->new_speed) !=
380 kingsun->speedparams.baudrate)
381 ks959_change_speed(kingsun, kingsun->new_speed);
383 netif_wake_queue(netdev);
389 * Called from net/core when new frame is available.
391 static netdev_tx_t ks959_hard_xmit(struct sk_buff *skb,
392 struct net_device *netdev)
394 struct ks959_cb *kingsun;
395 unsigned int wraplen;
398 netif_stop_queue(netdev);
400 /* the IRDA wrapping routines don't deal with non linear skb */
401 SKB_LINEAR_ASSERT(skb);
403 kingsun = netdev_priv(netdev);
405 spin_lock(&kingsun->lock);
406 kingsun->new_speed = irda_get_next_speed(skb);
408 /* Append data to the end of whatever data remains to be transmitted */
410 async_wrap_skb(skb, kingsun->tx_buf_clear, KINGSUN_SND_FIFO_SIZE);
411 kingsun->tx_buf_clear_used = wraplen;
413 if ((ret = ks959_submit_tx_fragment(kingsun)) != 0) {
414 dev_err(&kingsun->usbdev->dev,
415 "ks959_hard_xmit: failed tx_urb submit: %d\n", ret);
421 netdev->stats.tx_errors++;
422 netif_start_queue(netdev);
425 netdev->stats.tx_packets++;
426 netdev->stats.tx_bytes += skb->len;
431 spin_unlock(&kingsun->lock);
436 /* Receive callback function */
437 static void ks959_rcv_irq(struct urb *urb)
439 struct ks959_cb *kingsun = urb->context;
442 /* in process of stopping, just drop data */
443 if (!netif_running(kingsun->netdev)) {
444 kingsun->receiving = 0;
448 /* unlink, shutdown, unplug, other nasties */
449 if (urb->status != 0) {
450 dev_err(&kingsun->usbdev->dev,
451 "kingsun_rcv_irq: urb asynchronously failed - %d\n",
453 kingsun->receiving = 0;
457 if (urb->actual_length > 0) {
458 __u8 *bytes = urb->transfer_buffer;
461 for (i = 0; i < urb->actual_length; i++) {
462 /* De-obfuscation implemented here: variable portion of
463 xormask is incremented, and then used with the encoded
464 byte for the XOR. The result of the operation is used
465 to unwrap the SIR frame. */
466 kingsun->rx_variable_xormask++;
468 bytes[i] ^ kingsun->rx_variable_xormask ^ 0x55u;
470 /* rx_variable_xormask doubles as an index counter so we
471 can skip the byte at 0xff (wrapped around to 0).
473 if (kingsun->rx_variable_xormask != 0) {
474 async_unwrap_char(kingsun->netdev,
475 &kingsun->netdev->stats,
476 &kingsun->rx_unwrap_buff,
480 do_gettimeofday(&kingsun->rx_time);
482 (kingsun->rx_unwrap_buff.state != OUTSIDE_FRAME) ? 1 : 0;
485 /* This urb has already been filled in kingsun_net_open. Setup
486 packet must be re-filled, but it is assumed that urb keeps the
487 pointer to the initial setup packet, as well as the payload buffer.
488 Setup packet is already pre-filled at ks959_probe.
491 ret = usb_submit_urb(urb, GFP_ATOMIC);
495 * Function kingsun_net_open (dev)
497 * Network device is taken up. Usually this is done by "ifconfig irda0 up"
499 static int ks959_net_open(struct net_device *netdev)
501 struct ks959_cb *kingsun = netdev_priv(netdev);
505 /* At this point, urbs are NULL, and skb is NULL (see kingsun_probe) */
506 kingsun->receiving = 0;
508 /* Initialize for SIR to copy data directly into skb. */
509 kingsun->rx_unwrap_buff.in_frame = FALSE;
510 kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
511 kingsun->rx_unwrap_buff.truesize = IRDA_SKB_MAX_MTU;
512 kingsun->rx_unwrap_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
513 if (!kingsun->rx_unwrap_buff.skb)
516 skb_reserve(kingsun->rx_unwrap_buff.skb, 1);
517 kingsun->rx_unwrap_buff.head = kingsun->rx_unwrap_buff.skb->data;
518 do_gettimeofday(&kingsun->rx_time);
520 kingsun->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
521 if (!kingsun->rx_urb)
524 kingsun->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
525 if (!kingsun->tx_urb)
528 kingsun->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
529 if (!kingsun->speed_urb)
532 /* Initialize speed for dongle */
533 kingsun->new_speed = 9600;
534 err = ks959_change_speed(kingsun, 9600);
539 * Now that everything should be initialized properly,
540 * Open new IrLAP layer instance to take care of us...
542 sprintf(hwname, "usb#%d", kingsun->usbdev->devnum);
543 kingsun->irlap = irlap_open(netdev, &kingsun->qos, hwname);
544 if (!kingsun->irlap) {
546 dev_err(&kingsun->usbdev->dev, "irlap_open failed\n");
550 /* Start reception. Setup request already pre-filled in ks959_probe */
551 usb_fill_control_urb(kingsun->rx_urb, kingsun->usbdev,
552 usb_rcvctrlpipe(kingsun->usbdev, 0),
553 (unsigned char *)kingsun->rx_setuprequest,
554 kingsun->rx_buf, KINGSUN_RCV_FIFO_SIZE,
555 ks959_rcv_irq, kingsun);
556 kingsun->rx_urb->status = 0;
557 err = usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
559 dev_err(&kingsun->usbdev->dev,
560 "first urb-submit failed: %d\n", err);
564 netif_start_queue(netdev);
566 /* Situation at this point:
567 - all work buffers allocated
568 - urbs allocated and ready to fill
569 - max rx packet known (in max_rx)
570 - unwrap state machine initialized, in state outside of any frame
571 - receive request in progress
572 - IrLAP layer started, about to hand over packets to send
578 irlap_close(kingsun->irlap);
580 usb_free_urb(kingsun->speed_urb);
581 kingsun->speed_urb = NULL;
582 usb_free_urb(kingsun->tx_urb);
583 kingsun->tx_urb = NULL;
584 usb_free_urb(kingsun->rx_urb);
585 kingsun->rx_urb = NULL;
586 if (kingsun->rx_unwrap_buff.skb) {
587 kfree_skb(kingsun->rx_unwrap_buff.skb);
588 kingsun->rx_unwrap_buff.skb = NULL;
589 kingsun->rx_unwrap_buff.head = NULL;
595 * Function kingsun_net_close (kingsun)
597 * Network device is taken down. Usually this is done by
598 * "ifconfig irda0 down"
600 static int ks959_net_close(struct net_device *netdev)
602 struct ks959_cb *kingsun = netdev_priv(netdev);
604 /* Stop transmit processing */
605 netif_stop_queue(netdev);
607 /* Mop up receive && transmit urb's */
608 usb_kill_urb(kingsun->tx_urb);
609 usb_free_urb(kingsun->tx_urb);
610 kingsun->tx_urb = NULL;
612 usb_kill_urb(kingsun->speed_urb);
613 usb_free_urb(kingsun->speed_urb);
614 kingsun->speed_urb = NULL;
616 usb_kill_urb(kingsun->rx_urb);
617 usb_free_urb(kingsun->rx_urb);
618 kingsun->rx_urb = NULL;
620 kfree_skb(kingsun->rx_unwrap_buff.skb);
621 kingsun->rx_unwrap_buff.skb = NULL;
622 kingsun->rx_unwrap_buff.head = NULL;
623 kingsun->rx_unwrap_buff.in_frame = FALSE;
624 kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
625 kingsun->receiving = 0;
627 /* Stop and remove instance of IrLAP */
629 irlap_close(kingsun->irlap);
631 kingsun->irlap = NULL;
637 * IOCTLs : Extra out-of-band network commands...
639 static int ks959_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
641 struct if_irda_req *irq = (struct if_irda_req *)rq;
642 struct ks959_cb *kingsun = netdev_priv(netdev);
646 case SIOCSBANDWIDTH: /* Set bandwidth */
647 if (!capable(CAP_NET_ADMIN))
650 /* Check if the device is still there */
651 if (netif_device_present(kingsun->netdev))
652 return ks959_change_speed(kingsun, irq->ifr_baudrate);
655 case SIOCSMEDIABUSY: /* Set media busy */
656 if (!capable(CAP_NET_ADMIN))
659 /* Check if the IrDA stack is still there */
660 if (netif_running(kingsun->netdev))
661 irda_device_set_media_busy(kingsun->netdev, TRUE);
665 /* Only approximately true */
666 irq->ifr_receiving = kingsun->receiving;
676 static const struct net_device_ops ks959_ops = {
677 .ndo_start_xmit = ks959_hard_xmit,
678 .ndo_open = ks959_net_open,
679 .ndo_stop = ks959_net_close,
680 .ndo_do_ioctl = ks959_net_ioctl,
683 * This routine is called by the USB subsystem for each new device
684 * in the system. We need to check if the device is ours, and in
685 * this case start handling it.
687 static int ks959_probe(struct usb_interface *intf,
688 const struct usb_device_id *id)
690 struct usb_device *dev = interface_to_usbdev(intf);
691 struct ks959_cb *kingsun = NULL;
692 struct net_device *net = NULL;
695 /* Allocate network device container. */
696 net = alloc_irdadev(sizeof(*kingsun));
700 SET_NETDEV_DEV(net, &intf->dev);
701 kingsun = netdev_priv(net);
702 kingsun->netdev = net;
703 kingsun->usbdev = dev;
704 kingsun->irlap = NULL;
705 kingsun->tx_setuprequest = NULL;
706 kingsun->tx_urb = NULL;
707 kingsun->tx_buf_clear = NULL;
708 kingsun->tx_buf_xored = NULL;
709 kingsun->tx_buf_clear_used = 0;
710 kingsun->tx_buf_clear_sent = 0;
712 kingsun->rx_setuprequest = NULL;
713 kingsun->rx_urb = NULL;
714 kingsun->rx_buf = NULL;
715 kingsun->rx_variable_xormask = 0;
716 kingsun->rx_unwrap_buff.in_frame = FALSE;
717 kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
718 kingsun->rx_unwrap_buff.skb = NULL;
719 kingsun->receiving = 0;
720 spin_lock_init(&kingsun->lock);
722 kingsun->speed_setuprequest = NULL;
723 kingsun->speed_urb = NULL;
724 kingsun->speedparams.baudrate = 0;
726 /* Allocate input buffer */
727 kingsun->rx_buf = kmalloc(KINGSUN_RCV_FIFO_SIZE, GFP_KERNEL);
728 if (!kingsun->rx_buf)
731 /* Allocate input setup packet */
732 kingsun->rx_setuprequest =
733 kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
734 if (!kingsun->rx_setuprequest)
736 kingsun->rx_setuprequest->bRequestType =
737 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
738 kingsun->rx_setuprequest->bRequest = KINGSUN_REQ_RECV;
739 kingsun->rx_setuprequest->wValue = cpu_to_le16(0x0200);
740 kingsun->rx_setuprequest->wIndex = 0;
741 kingsun->rx_setuprequest->wLength = cpu_to_le16(KINGSUN_RCV_FIFO_SIZE);
743 /* Allocate output buffer */
744 kingsun->tx_buf_clear = kmalloc(KINGSUN_SND_FIFO_SIZE, GFP_KERNEL);
745 if (!kingsun->tx_buf_clear)
747 kingsun->tx_buf_xored = kmalloc(KINGSUN_SND_PACKET_SIZE, GFP_KERNEL);
748 if (!kingsun->tx_buf_xored)
751 /* Allocate and initialize output setup packet */
752 kingsun->tx_setuprequest =
753 kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
754 if (!kingsun->tx_setuprequest)
756 kingsun->tx_setuprequest->bRequestType =
757 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
758 kingsun->tx_setuprequest->bRequest = KINGSUN_REQ_SEND;
759 kingsun->tx_setuprequest->wValue = 0;
760 kingsun->tx_setuprequest->wIndex = 0;
761 kingsun->tx_setuprequest->wLength = 0;
763 /* Allocate and initialize speed setup packet */
764 kingsun->speed_setuprequest =
765 kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
766 if (!kingsun->speed_setuprequest)
768 kingsun->speed_setuprequest->bRequestType =
769 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
770 kingsun->speed_setuprequest->bRequest = KINGSUN_REQ_SEND;
771 kingsun->speed_setuprequest->wValue = cpu_to_le16(0x0200);
772 kingsun->speed_setuprequest->wIndex = cpu_to_le16(0x0001);
773 kingsun->speed_setuprequest->wLength =
774 cpu_to_le16(sizeof(struct ks959_speedparams));
776 printk(KERN_INFO "KingSun KS-959 IRDA/USB found at address %d, "
777 "Vendor: %x, Product: %x\n",
778 dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
779 le16_to_cpu(dev->descriptor.idProduct));
781 /* Initialize QoS for this device */
782 irda_init_max_qos_capabilies(&kingsun->qos);
784 /* Baud rates known to be supported. Please uncomment if devices (other
785 than a SonyEriccson K300 phone) can be shown to support higher speed
788 kingsun->qos.baud_rate.bits =
789 IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600;
790 kingsun->qos.min_turn_time.bits &= KINGSUN_MTT;
791 irda_qos_bits_to_value(&kingsun->qos);
793 /* Override the network functions we need to use */
794 net->netdev_ops = &ks959_ops;
796 ret = register_netdev(net);
800 dev_info(&net->dev, "IrDA: Registered KingSun KS-959 device %s\n",
803 usb_set_intfdata(intf, kingsun);
805 /* Situation at this point:
806 - all work buffers allocated
807 - setup requests pre-filled
808 - urbs not allocated, set to NULL
809 - max rx packet known (is KINGSUN_FIFO_SIZE)
810 - unwrap state machine (partially) initialized, but skb == NULL
816 kfree(kingsun->speed_setuprequest);
817 kfree(kingsun->tx_setuprequest);
818 kfree(kingsun->tx_buf_xored);
819 kfree(kingsun->tx_buf_clear);
820 kfree(kingsun->rx_setuprequest);
821 kfree(kingsun->rx_buf);
828 * The current device is removed, the USB layer tell us to shut it down...
830 static void ks959_disconnect(struct usb_interface *intf)
832 struct ks959_cb *kingsun = usb_get_intfdata(intf);
837 unregister_netdev(kingsun->netdev);
839 /* Mop up receive && transmit urb's */
840 if (kingsun->speed_urb != NULL) {
841 usb_kill_urb(kingsun->speed_urb);
842 usb_free_urb(kingsun->speed_urb);
843 kingsun->speed_urb = NULL;
845 if (kingsun->tx_urb != NULL) {
846 usb_kill_urb(kingsun->tx_urb);
847 usb_free_urb(kingsun->tx_urb);
848 kingsun->tx_urb = NULL;
850 if (kingsun->rx_urb != NULL) {
851 usb_kill_urb(kingsun->rx_urb);
852 usb_free_urb(kingsun->rx_urb);
853 kingsun->rx_urb = NULL;
856 kfree(kingsun->speed_setuprequest);
857 kfree(kingsun->tx_setuprequest);
858 kfree(kingsun->tx_buf_xored);
859 kfree(kingsun->tx_buf_clear);
860 kfree(kingsun->rx_setuprequest);
861 kfree(kingsun->rx_buf);
862 free_netdev(kingsun->netdev);
864 usb_set_intfdata(intf, NULL);
868 /* USB suspend, so power off the transmitter/receiver */
869 static int ks959_suspend(struct usb_interface *intf, pm_message_t message)
871 struct ks959_cb *kingsun = usb_get_intfdata(intf);
873 netif_device_detach(kingsun->netdev);
874 if (kingsun->speed_urb != NULL)
875 usb_kill_urb(kingsun->speed_urb);
876 if (kingsun->tx_urb != NULL)
877 usb_kill_urb(kingsun->tx_urb);
878 if (kingsun->rx_urb != NULL)
879 usb_kill_urb(kingsun->rx_urb);
883 /* Coming out of suspend, so reset hardware */
884 static int ks959_resume(struct usb_interface *intf)
886 struct ks959_cb *kingsun = usb_get_intfdata(intf);
888 if (kingsun->rx_urb != NULL) {
889 /* Setup request already filled in ks959_probe */
890 usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
892 netif_device_attach(kingsun->netdev);
899 * USB device callbacks
901 static struct usb_driver irda_driver = {
903 .probe = ks959_probe,
904 .disconnect = ks959_disconnect,
907 .suspend = ks959_suspend,
908 .resume = ks959_resume,
912 module_usb_driver(irda_driver);
914 MODULE_AUTHOR("Alex Villacís Lasso <a_villacis@palosanto.com>");
915 MODULE_DESCRIPTION("IrDA-USB Dongle Driver for KingSun KS-959");
916 MODULE_LICENSE("GPL");