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/module.h>
122 #include <linux/kref.h>
123 #include <linux/usb.h>
124 #include <linux/device.h>
125 #include <linux/crc32.h>
127 #include <asm/unaligned.h>
128 #include <asm/byteorder.h>
129 #include <asm/uaccess.h>
131 #include <net/irda/irda.h>
132 #include <net/irda/wrapper.h>
133 #include <net/irda/crc.h>
135 #define KS959_VENDOR_ID 0x07d0
136 #define KS959_PRODUCT_ID 0x4959
138 /* These are the currently known USB ids */
139 static struct usb_device_id dongles[] = {
140 /* KingSun Co,Ltd IrDA/USB Bridge */
141 {USB_DEVICE(KS959_VENDOR_ID, KS959_PRODUCT_ID)},
145 MODULE_DEVICE_TABLE(usb, dongles);
147 #define KINGSUN_MTT 0x07
148 #define KINGSUN_REQ_RECV 0x01
149 #define KINGSUN_REQ_SEND 0x09
151 #define KINGSUN_RCV_FIFO_SIZE 2048 /* Max length we can receive */
152 #define KINGSUN_SND_FIFO_SIZE 2048 /* Max packet we can send */
153 #define KINGSUN_SND_PACKET_SIZE 256 /* Max packet dongle can handle */
155 struct ks959_speedparams {
156 __le32 baudrate; /* baud rate, little endian */
159 } __attribute__ ((packed));
161 #define KS_DATA_5_BITS 0x00
162 #define KS_DATA_6_BITS 0x01
163 #define KS_DATA_7_BITS 0x02
164 #define KS_DATA_8_BITS 0x03
166 #define KS_STOP_BITS_1 0x00
167 #define KS_STOP_BITS_2 0x08
169 #define KS_PAR_DISABLE 0x00
170 #define KS_PAR_EVEN 0x10
171 #define KS_PAR_ODD 0x30
172 #define KS_RESET 0x80
175 struct usb_device *usbdev; /* init: probe_irda */
176 struct net_device *netdev; /* network layer */
177 struct irlap_cb *irlap; /* The link layer we are binded to */
178 struct net_device_stats stats; /* network statistics */
181 struct usb_ctrlrequest *tx_setuprequest;
184 unsigned int tx_buf_clear_used;
185 unsigned int tx_buf_clear_sent;
188 struct usb_ctrlrequest *rx_setuprequest;
191 __u8 rx_variable_xormask;
192 iobuff_t rx_unwrap_buff;
193 struct timeval rx_time;
195 struct usb_ctrlrequest *speed_setuprequest;
196 struct urb *speed_urb;
197 struct ks959_speedparams speedparams;
198 unsigned int new_speed;
204 /* Procedure to perform the obfuscation/padding expected by the dongle
206 * buf_cleartext (IN) Cleartext version of the IrDA frame to transmit
207 * len_cleartext (IN) Length of the cleartext version of IrDA frame
208 * buf_xoredtext (OUT) Obfuscated version of frame built by proc
209 * len_maxbuf (OUT) Maximum space available at buf_xoredtext
211 * (return) length of obfuscated frame with padding
213 * If not enough space (as indicated by len_maxbuf vs. required padding),
216 * The value of lookup_string is actually a required portion of the algorithm.
217 * Seems the designer of the dongle wanted to state who exactly is responsible
218 * for implementing obfuscation. Send your best (or other) wishes to him ]:-)
220 static unsigned int obfuscate_tx_buffer(const __u8 * buf_cleartext,
221 unsigned int len_cleartext,
222 __u8 * buf_xoredtext,
223 unsigned int len_maxbuf)
225 unsigned int len_xoredtext;
227 /* Calculate required length with padding, check for necessary space */
228 len_xoredtext = ((len_cleartext + 7) & ~0x7) + 0x10;
229 if (len_xoredtext <= len_maxbuf) {
230 static const __u8 lookup_string[] = "wangshuofei19710";
233 /* Unlike the WinXP driver, we *do* clear out the padding */
234 memset(buf_xoredtext, 0, len_xoredtext);
236 xor_mask = lookup_string[(len_cleartext & 0x0f) ^ 0x06] ^ 0x55;
238 while (len_cleartext-- > 0) {
239 *buf_xoredtext++ = *buf_cleartext++ ^ xor_mask;
244 return len_xoredtext;
247 /* Callback transmission routine */
248 static void ks959_speed_irq(struct urb *urb)
250 /* unlink, shutdown, unplug, other nasties */
251 if (urb->status != 0) {
252 err("ks959_speed_irq: urb asynchronously failed - %d",
257 /* Send a control request to change speed of the dongle */
258 static int ks959_change_speed(struct ks959_cb *kingsun, unsigned speed)
260 static unsigned int supported_speeds[] = { 2400, 9600, 19200, 38400,
261 57600, 115200, 576000, 1152000, 4000000, 0
266 if (kingsun->speed_setuprequest == NULL || kingsun->speed_urb == NULL)
269 /* Check that requested speed is among the supported ones */
270 for (i = 0; supported_speeds[i] && supported_speeds[i] != speed; i++) ;
271 if (supported_speeds[i] == 0)
274 memset(&(kingsun->speedparams), 0, sizeof(struct ks959_speedparams));
275 kingsun->speedparams.baudrate = cpu_to_le32(speed);
276 kingsun->speedparams.flags = KS_DATA_8_BITS;
278 /* speed_setuprequest pre-filled in ks959_probe */
279 usb_fill_control_urb(kingsun->speed_urb, kingsun->usbdev,
280 usb_sndctrlpipe(kingsun->usbdev, 0),
281 (unsigned char *)kingsun->speed_setuprequest,
282 &(kingsun->speedparams),
283 sizeof(struct ks959_speedparams), ks959_speed_irq,
285 kingsun->speed_urb->status = 0;
286 err = usb_submit_urb(kingsun->speed_urb, GFP_ATOMIC);
291 /* Submit one fragment of an IrDA frame to the dongle */
292 static void ks959_send_irq(struct urb *urb);
293 static int ks959_submit_tx_fragment(struct ks959_cb *kingsun)
296 unsigned int wraplen;
299 /* Check whether current plaintext can produce a padded buffer that fits
300 within the range handled by the dongle */
301 wraplen = (KINGSUN_SND_PACKET_SIZE & ~0x7) - 0x10;
302 if (wraplen > kingsun->tx_buf_clear_used)
303 wraplen = kingsun->tx_buf_clear_used;
305 /* Perform dongle obfuscation. Also remove the portion of the frame that
306 was just obfuscated and will now be sent to the dongle. */
307 padlen = obfuscate_tx_buffer(kingsun->tx_buf_clear, wraplen,
308 kingsun->tx_buf_xored,
309 KINGSUN_SND_PACKET_SIZE);
311 /* Calculate how much data can be transmitted in this urb */
312 kingsun->tx_setuprequest->wValue = cpu_to_le16(wraplen);
313 kingsun->tx_setuprequest->wLength = cpu_to_le16(padlen);
314 /* Rest of the fields were filled in ks959_probe */
315 usb_fill_control_urb(kingsun->tx_urb, kingsun->usbdev,
316 usb_sndctrlpipe(kingsun->usbdev, 0),
317 (unsigned char *)kingsun->tx_setuprequest,
318 kingsun->tx_buf_xored, padlen,
319 ks959_send_irq, kingsun);
320 kingsun->tx_urb->status = 0;
321 ret = usb_submit_urb(kingsun->tx_urb, GFP_ATOMIC);
323 /* Remember how much data was sent, in order to update at callback */
324 kingsun->tx_buf_clear_sent = (ret == 0) ? wraplen : 0;
328 /* Callback transmission routine */
329 static void ks959_send_irq(struct urb *urb)
331 struct ks959_cb *kingsun = urb->context;
332 struct net_device *netdev = kingsun->netdev;
335 /* in process of stopping, just drop data */
336 if (!netif_running(kingsun->netdev)) {
337 err("ks959_send_irq: Network not running!");
341 /* unlink, shutdown, unplug, other nasties */
342 if (urb->status != 0) {
343 err("ks959_send_irq: urb asynchronously failed - %d",
348 if (kingsun->tx_buf_clear_used > 0) {
349 /* Update data remaining to be sent */
350 if (kingsun->tx_buf_clear_sent < kingsun->tx_buf_clear_used) {
351 memmove(kingsun->tx_buf_clear,
352 kingsun->tx_buf_clear +
353 kingsun->tx_buf_clear_sent,
354 kingsun->tx_buf_clear_used -
355 kingsun->tx_buf_clear_sent);
357 kingsun->tx_buf_clear_used -= kingsun->tx_buf_clear_sent;
358 kingsun->tx_buf_clear_sent = 0;
360 if (kingsun->tx_buf_clear_used > 0) {
361 /* There is more data to be sent */
362 if ((ret = ks959_submit_tx_fragment(kingsun)) != 0) {
363 err("ks959_send_irq: failed tx_urb submit: %d",
370 kingsun->stats.tx_errors++;
371 netif_start_queue(netdev);
375 /* All data sent, send next speed && wake network queue */
376 if (kingsun->new_speed != -1 &&
377 cpu_to_le32(kingsun->new_speed) !=
378 kingsun->speedparams.baudrate)
379 ks959_change_speed(kingsun, kingsun->new_speed);
381 netif_wake_queue(netdev);
387 * Called from net/core when new frame is available.
389 static int ks959_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
391 struct ks959_cb *kingsun;
392 unsigned int wraplen;
395 if (skb == NULL || netdev == NULL)
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 err("ks959_hard_xmit: failed tx_urb submit: %d", ret);
420 kingsun->stats.tx_errors++;
421 netif_start_queue(netdev);
424 kingsun->stats.tx_packets++;
425 kingsun->stats.tx_bytes += skb->len;
430 spin_unlock(&kingsun->lock);
435 /* Receive callback function */
436 static void ks959_rcv_irq(struct urb *urb)
438 struct ks959_cb *kingsun = urb->context;
441 /* in process of stopping, just drop data */
442 if (!netif_running(kingsun->netdev)) {
443 kingsun->receiving = 0;
447 /* unlink, shutdown, unplug, other nasties */
448 if (urb->status != 0) {
449 err("kingsun_rcv_irq: urb asynchronously failed - %d",
451 kingsun->receiving = 0;
455 if (urb->actual_length > 0) {
456 __u8 *bytes = urb->transfer_buffer;
459 for (i = 0; i < urb->actual_length; i++) {
460 /* De-obfuscation implemented here: variable portion of
461 xormask is incremented, and then used with the encoded
462 byte for the XOR. The result of the operation is used
463 to unwrap the SIR frame. */
464 kingsun->rx_variable_xormask++;
466 bytes[i] ^ kingsun->rx_variable_xormask ^ 0x55u;
468 /* rx_variable_xormask doubles as an index counter so we
469 can skip the byte at 0xff (wrapped around to 0).
471 if (kingsun->rx_variable_xormask != 0) {
472 async_unwrap_char(kingsun->netdev,
474 &kingsun->rx_unwrap_buff,
478 kingsun->netdev->last_rx = jiffies;
479 do_gettimeofday(&kingsun->rx_time);
481 (kingsun->rx_unwrap_buff.state != OUTSIDE_FRAME) ? 1 : 0;
484 /* This urb has already been filled in kingsun_net_open. Setup
485 packet must be re-filled, but it is assumed that urb keeps the
486 pointer to the initial setup packet, as well as the payload buffer.
487 Setup packet is already pre-filled at ks959_probe.
490 ret = usb_submit_urb(urb, GFP_ATOMIC);
494 * Function kingsun_net_open (dev)
496 * Network device is taken up. Usually this is done by "ifconfig irda0 up"
498 static int ks959_net_open(struct net_device *netdev)
500 struct ks959_cb *kingsun = netdev_priv(netdev);
504 /* At this point, urbs are NULL, and skb is NULL (see kingsun_probe) */
505 kingsun->receiving = 0;
507 /* Initialize for SIR to copy data directly into skb. */
508 kingsun->rx_unwrap_buff.in_frame = FALSE;
509 kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
510 kingsun->rx_unwrap_buff.truesize = IRDA_SKB_MAX_MTU;
511 kingsun->rx_unwrap_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
512 if (!kingsun->rx_unwrap_buff.skb)
515 skb_reserve(kingsun->rx_unwrap_buff.skb, 1);
516 kingsun->rx_unwrap_buff.head = kingsun->rx_unwrap_buff.skb->data;
517 do_gettimeofday(&kingsun->rx_time);
519 kingsun->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
520 if (!kingsun->rx_urb)
523 kingsun->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
524 if (!kingsun->tx_urb)
527 kingsun->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
528 if (!kingsun->speed_urb)
531 /* Initialize speed for dongle */
532 kingsun->new_speed = 9600;
533 err = ks959_change_speed(kingsun, 9600);
538 * Now that everything should be initialized properly,
539 * Open new IrLAP layer instance to take care of us...
541 sprintf(hwname, "usb#%d", kingsun->usbdev->devnum);
542 kingsun->irlap = irlap_open(netdev, &kingsun->qos, hwname);
543 if (!kingsun->irlap) {
544 err("ks959-sir: irlap_open failed");
548 /* Start reception. Setup request already pre-filled in ks959_probe */
549 usb_fill_control_urb(kingsun->rx_urb, kingsun->usbdev,
550 usb_rcvctrlpipe(kingsun->usbdev, 0),
551 (unsigned char *)kingsun->rx_setuprequest,
552 kingsun->rx_buf, KINGSUN_RCV_FIFO_SIZE,
553 ks959_rcv_irq, kingsun);
554 kingsun->rx_urb->status = 0;
555 err = usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
557 err("ks959-sir: first urb-submit failed: %d", err);
561 netif_start_queue(netdev);
563 /* Situation at this point:
564 - all work buffers allocated
565 - urbs allocated and ready to fill
566 - max rx packet known (in max_rx)
567 - unwrap state machine initialized, in state outside of any frame
568 - receive request in progress
569 - IrLAP layer started, about to hand over packets to send
575 irlap_close(kingsun->irlap);
577 usb_free_urb(kingsun->speed_urb);
578 kingsun->speed_urb = NULL;
579 usb_free_urb(kingsun->tx_urb);
580 kingsun->tx_urb = NULL;
581 usb_free_urb(kingsun->rx_urb);
582 kingsun->rx_urb = NULL;
583 if (kingsun->rx_unwrap_buff.skb) {
584 kfree_skb(kingsun->rx_unwrap_buff.skb);
585 kingsun->rx_unwrap_buff.skb = NULL;
586 kingsun->rx_unwrap_buff.head = NULL;
592 * Function kingsun_net_close (kingsun)
594 * Network device is taken down. Usually this is done by
595 * "ifconfig irda0 down"
597 static int ks959_net_close(struct net_device *netdev)
599 struct ks959_cb *kingsun = netdev_priv(netdev);
601 /* Stop transmit processing */
602 netif_stop_queue(netdev);
604 /* Mop up receive && transmit urb's */
605 usb_kill_urb(kingsun->tx_urb);
606 usb_free_urb(kingsun->tx_urb);
607 kingsun->tx_urb = NULL;
609 usb_kill_urb(kingsun->speed_urb);
610 usb_free_urb(kingsun->speed_urb);
611 kingsun->speed_urb = NULL;
613 usb_kill_urb(kingsun->rx_urb);
614 usb_free_urb(kingsun->rx_urb);
615 kingsun->rx_urb = NULL;
617 kfree_skb(kingsun->rx_unwrap_buff.skb);
618 kingsun->rx_unwrap_buff.skb = NULL;
619 kingsun->rx_unwrap_buff.head = NULL;
620 kingsun->rx_unwrap_buff.in_frame = FALSE;
621 kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
622 kingsun->receiving = 0;
624 /* Stop and remove instance of IrLAP */
626 irlap_close(kingsun->irlap);
628 kingsun->irlap = NULL;
634 * IOCTLs : Extra out-of-band network commands...
636 static int ks959_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
638 struct if_irda_req *irq = (struct if_irda_req *)rq;
639 struct ks959_cb *kingsun = netdev_priv(netdev);
643 case SIOCSBANDWIDTH: /* Set bandwidth */
644 if (!capable(CAP_NET_ADMIN))
647 /* Check if the device is still there */
648 if (netif_device_present(kingsun->netdev))
649 return ks959_change_speed(kingsun, irq->ifr_baudrate);
652 case SIOCSMEDIABUSY: /* Set media busy */
653 if (!capable(CAP_NET_ADMIN))
656 /* Check if the IrDA stack is still there */
657 if (netif_running(kingsun->netdev))
658 irda_device_set_media_busy(kingsun->netdev, TRUE);
662 /* Only approximately true */
663 irq->ifr_receiving = kingsun->receiving;
674 * Get device stats (for /proc/net/dev and ifconfig)
676 static struct net_device_stats *ks959_net_get_stats(struct net_device *netdev)
678 struct ks959_cb *kingsun = netdev_priv(netdev);
679 return &kingsun->stats;
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->hard_start_xmit = ks959_hard_xmit;
795 net->open = ks959_net_open;
796 net->stop = ks959_net_close;
797 net->get_stats = ks959_net_get_stats;
798 net->do_ioctl = ks959_net_ioctl;
800 ret = register_netdev(net);
804 dev_info(&net->dev, "IrDA: Registered KingSun KS-959 device %s\n",
807 usb_set_intfdata(intf, kingsun);
809 /* Situation at this point:
810 - all work buffers allocated
811 - setup requests pre-filled
812 - urbs not allocated, set to NULL
813 - max rx packet known (is KINGSUN_FIFO_SIZE)
814 - unwrap state machine (partially) initialized, but skb == NULL
820 kfree(kingsun->speed_setuprequest);
821 kfree(kingsun->tx_setuprequest);
822 kfree(kingsun->tx_buf_xored);
823 kfree(kingsun->tx_buf_clear);
824 kfree(kingsun->rx_setuprequest);
825 kfree(kingsun->rx_buf);
832 * The current device is removed, the USB layer tell us to shut it down...
834 static void ks959_disconnect(struct usb_interface *intf)
836 struct ks959_cb *kingsun = usb_get_intfdata(intf);
841 unregister_netdev(kingsun->netdev);
843 /* Mop up receive && transmit urb's */
844 if (kingsun->speed_urb != NULL) {
845 usb_kill_urb(kingsun->speed_urb);
846 usb_free_urb(kingsun->speed_urb);
847 kingsun->speed_urb = NULL;
849 if (kingsun->tx_urb != NULL) {
850 usb_kill_urb(kingsun->tx_urb);
851 usb_free_urb(kingsun->tx_urb);
852 kingsun->tx_urb = NULL;
854 if (kingsun->rx_urb != NULL) {
855 usb_kill_urb(kingsun->rx_urb);
856 usb_free_urb(kingsun->rx_urb);
857 kingsun->rx_urb = NULL;
860 kfree(kingsun->speed_setuprequest);
861 kfree(kingsun->tx_setuprequest);
862 kfree(kingsun->tx_buf_xored);
863 kfree(kingsun->tx_buf_clear);
864 kfree(kingsun->rx_setuprequest);
865 kfree(kingsun->rx_buf);
866 free_netdev(kingsun->netdev);
868 usb_set_intfdata(intf, NULL);
872 /* USB suspend, so power off the transmitter/receiver */
873 static int ks959_suspend(struct usb_interface *intf, pm_message_t message)
875 struct ks959_cb *kingsun = usb_get_intfdata(intf);
877 netif_device_detach(kingsun->netdev);
878 if (kingsun->speed_urb != NULL)
879 usb_kill_urb(kingsun->speed_urb);
880 if (kingsun->tx_urb != NULL)
881 usb_kill_urb(kingsun->tx_urb);
882 if (kingsun->rx_urb != NULL)
883 usb_kill_urb(kingsun->rx_urb);
887 /* Coming out of suspend, so reset hardware */
888 static int ks959_resume(struct usb_interface *intf)
890 struct ks959_cb *kingsun = usb_get_intfdata(intf);
892 if (kingsun->rx_urb != NULL) {
893 /* Setup request already filled in ks959_probe */
894 usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
896 netif_device_attach(kingsun->netdev);
903 * USB device callbacks
905 static struct usb_driver irda_driver = {
907 .probe = ks959_probe,
908 .disconnect = ks959_disconnect,
911 .suspend = ks959_suspend,
912 .resume = ks959_resume,
919 static int __init ks959_init(void)
921 return usb_register(&irda_driver);
924 module_init(ks959_init);
929 static void __exit ks959_cleanup(void)
931 /* Deregister the driver and remove all pending instances */
932 usb_deregister(&irda_driver);
935 module_exit(ks959_cleanup);
937 MODULE_AUTHOR("Alex Villacís Lasso <a_villacis@palosanto.com>");
938 MODULE_DESCRIPTION("IrDA-USB Dongle Driver for KingSun KS-959");
939 MODULE_LICENSE("GPL");