1 /*****************************************************************************
3 * Filename: kingsun-sir.c
5 * Description: Irda KingSun/DonShine USB Dongle
7 * Author: Alex Villac�s Lasso <a_villacis@palosanto.com>
9 * Based on stir4200 and mcs7780 drivers, with (strange?) differences
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.
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.
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.
24 *****************************************************************************/
27 * This is my current (2007-04-25) understanding of how this dongle is supposed
28 * to work. This is based on reverse-engineering and examination of the packet
29 * data sent and received by the WinXP driver using USBSnoopy. Feel free to
30 * update here as more of this dongle is known:
32 * General: Unlike the other USB IrDA dongles, this particular dongle exposes,
33 * not two bulk (in and out) endpoints, but two *interrupt* ones. This dongle,
34 * like the bulk based ones (stir4200.c and mcs7780.c), requires polling in
35 * order to receive data.
36 * Transmission: Just like stir4200, this dongle uses a raw stream of data,
37 * which needs to be wrapped and escaped in a similar way as in stir4200.c.
38 * Reception: Poll-based, as in stir4200. Each read returns the contents of a
39 * 8-byte buffer, of which the first byte (LSB) indicates the number of bytes
40 * (1-7) of valid data contained within the remaining 7 bytes. For example, if
41 * the buffer had the following contents:
42 * 06 ff ff ff c0 01 04 aa
43 * This means that (06) there are 6 bytes of valid data. The byte 0xaa at the
44 * end is garbage (left over from a previous reception) and is discarded.
45 * If a read returns an "impossible" value as the length of valid data (such as
46 * 0x36) in the first byte, then the buffer is uninitialized (as is the case of
47 * first plug-in) and its contents should be discarded. There is currently no
48 * evidence that the top 5 bits of the 1st byte of the buffer can have values
49 * other than 0 once reception begins.
50 * Once valid bytes are collected, the assembled stream is a sequence of
51 * wrapped IrDA frames that is unwrapped and unescaped as in stir4200.c.
52 * BIG FAT WARNING: the dongle does *not* reset the RX buffer in any way after
53 * a successful read from the host, which means that in absence of further
54 * reception, repeated reads from the dongle will return the exact same
55 * contents repeatedly. Attempts to be smart and cache a previous read seem
56 * to result in corrupted packets, so this driver depends on the unwrap logic
57 * to sort out any repeated reads.
58 * Speed change: no commands observed so far to change speed, assumed fixed
62 #include <linux/module.h>
63 #include <linux/moduleparam.h>
64 #include <linux/kernel.h>
65 #include <linux/types.h>
66 #include <linux/errno.h>
67 #include <linux/init.h>
68 #include <linux/slab.h>
69 #include <linux/module.h>
70 #include <linux/kref.h>
71 #include <linux/usb.h>
72 #include <linux/device.h>
73 #include <linux/crc32.h>
75 #include <asm/unaligned.h>
76 #include <asm/byteorder.h>
77 #include <asm/uaccess.h>
79 #include <net/irda/irda.h>
80 #include <net/irda/wrapper.h>
81 #include <net/irda/crc.h>
84 * According to lsusb, 0x07c0 is assigned to
85 * "Code Mercenaries Hard- und Software GmbH"
87 #define KING_VENDOR_ID 0x07c0
88 #define KING_PRODUCT_ID 0x4200
90 /* These are the currently known USB ids */
91 static struct usb_device_id dongles[] = {
92 /* KingSun Co,Ltd IrDA/USB Bridge */
93 { USB_DEVICE(KING_VENDOR_ID, KING_PRODUCT_ID) },
97 MODULE_DEVICE_TABLE(usb, dongles);
99 #define KINGSUN_MTT 0x07
101 #define KINGSUN_FIFO_SIZE 4096
102 #define KINGSUN_EP_IN 0
103 #define KINGSUN_EP_OUT 1
106 struct usb_device *usbdev; /* init: probe_irda */
107 struct net_device *netdev; /* network layer */
108 struct irlap_cb *irlap; /* The link layer we are binded to */
109 struct net_device_stats stats; /* network statistics */
112 __u8 *in_buf; /* receive buffer */
113 __u8 *out_buf; /* transmit buffer */
114 __u8 max_rx; /* max. atomic read from dongle
115 (usually 8), also size of in_buf */
116 __u8 max_tx; /* max. atomic write to dongle
119 iobuff_t rx_buff; /* receive unwrap state machine */
120 struct timeval rx_time;
131 /* Callback transmission routine */
132 static void kingsun_send_irq(struct urb *urb)
134 struct kingsun_cb *kingsun = urb->context;
135 struct net_device *netdev = kingsun->netdev;
137 /* in process of stopping, just drop data */
138 if (!netif_running(kingsun->netdev)) {
139 err("kingsun_send_irq: Network not running!");
143 /* unlink, shutdown, unplug, other nasties */
144 if (urb->status != 0) {
145 err("kingsun_send_irq: urb asynchronously failed - %d",
148 netif_wake_queue(netdev);
152 * Called from net/core when new frame is available.
154 static int kingsun_hard_xmit(struct sk_buff *skb, struct net_device *netdev)
156 struct kingsun_cb *kingsun;
160 if (skb == NULL || netdev == NULL)
163 netif_stop_queue(netdev);
165 /* the IRDA wrapping routines don't deal with non linear skb */
166 SKB_LINEAR_ASSERT(skb);
168 kingsun = netdev_priv(netdev);
170 spin_lock(&kingsun->lock);
172 /* Append data to the end of whatever data remains to be transmitted */
173 wraplen = async_wrap_skb(skb,
177 /* Calculate how much data can be transmitted in this urb */
178 usb_fill_int_urb(kingsun->tx_urb, kingsun->usbdev,
179 usb_sndintpipe(kingsun->usbdev, kingsun->ep_out),
180 kingsun->out_buf, wraplen, kingsun_send_irq,
183 if ((ret = usb_submit_urb(kingsun->tx_urb, GFP_ATOMIC))) {
184 err("kingsun_hard_xmit: failed tx_urb submit: %d", ret);
190 kingsun->stats.tx_errors++;
191 netif_start_queue(netdev);
194 kingsun->stats.tx_packets++;
195 kingsun->stats.tx_bytes += skb->len;
199 spin_unlock(&kingsun->lock);
204 /* Receive callback function */
205 static void kingsun_rcv_irq(struct urb *urb)
207 struct kingsun_cb *kingsun = urb->context;
210 /* in process of stopping, just drop data */
211 if (!netif_running(kingsun->netdev)) {
212 kingsun->receiving = 0;
216 /* unlink, shutdown, unplug, other nasties */
217 if (urb->status != 0) {
218 err("kingsun_rcv_irq: urb asynchronously failed - %d",
220 kingsun->receiving = 0;
224 if (urb->actual_length == kingsun->max_rx) {
225 __u8 *bytes = urb->transfer_buffer;
228 /* The very first byte in the buffer indicates the length of
229 valid data in the read. This byte must be in the range
230 1..kingsun->max_rx -1 . Values outside this range indicate
231 an uninitialized Rx buffer when the dongle has just been
233 if (bytes[0] >= 1 && bytes[0] < kingsun->max_rx) {
234 for (i = 1; i <= bytes[0]; i++) {
235 async_unwrap_char(kingsun->netdev,
237 &kingsun->rx_buff, bytes[i]);
239 kingsun->netdev->last_rx = jiffies;
240 do_gettimeofday(&kingsun->rx_time);
242 (kingsun->rx_buff.state != OUTSIDE_FRAME)
245 } else if (urb->actual_length > 0) {
246 err("%s(): Unexpected response length, expected %d got %d",
247 __FUNCTION__, kingsun->max_rx, urb->actual_length);
249 /* This urb has already been filled in kingsun_net_open */
250 ret = usb_submit_urb(urb, GFP_ATOMIC);
254 * Function kingsun_net_open (dev)
256 * Network device is taken up. Usually this is done by "ifconfig irda0 up"
258 static int kingsun_net_open(struct net_device *netdev)
260 struct kingsun_cb *kingsun = netdev_priv(netdev);
264 /* At this point, urbs are NULL, and skb is NULL (see kingsun_probe) */
265 kingsun->receiving = 0;
267 /* Initialize for SIR to copy data directly into skb. */
268 kingsun->rx_buff.in_frame = FALSE;
269 kingsun->rx_buff.state = OUTSIDE_FRAME;
270 kingsun->rx_buff.truesize = IRDA_SKB_MAX_MTU;
271 kingsun->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
272 if (!kingsun->rx_buff.skb)
275 skb_reserve(kingsun->rx_buff.skb, 1);
276 kingsun->rx_buff.head = kingsun->rx_buff.skb->data;
277 do_gettimeofday(&kingsun->rx_time);
279 kingsun->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
280 if (!kingsun->rx_urb)
283 kingsun->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
284 if (!kingsun->tx_urb)
288 * Now that everything should be initialized properly,
289 * Open new IrLAP layer instance to take care of us...
291 sprintf(hwname, "usb#%d", kingsun->usbdev->devnum);
292 kingsun->irlap = irlap_open(netdev, &kingsun->qos, hwname);
293 if (!kingsun->irlap) {
294 err("kingsun-sir: irlap_open failed");
298 /* Start first reception */
299 usb_fill_int_urb(kingsun->rx_urb, kingsun->usbdev,
300 usb_rcvintpipe(kingsun->usbdev, kingsun->ep_in),
301 kingsun->in_buf, kingsun->max_rx,
302 kingsun_rcv_irq, kingsun, 1);
303 kingsun->rx_urb->status = 0;
304 err = usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
306 err("kingsun-sir: first urb-submit failed: %d", err);
310 netif_start_queue(netdev);
312 /* Situation at this point:
313 - all work buffers allocated
314 - urbs allocated and ready to fill
315 - max rx packet known (in max_rx)
316 - unwrap state machine initialized, in state outside of any frame
317 - receive request in progress
318 - IrLAP layer started, about to hand over packets to send
324 irlap_close(kingsun->irlap);
326 if (kingsun->tx_urb) {
327 usb_free_urb(kingsun->tx_urb);
328 kingsun->tx_urb = NULL;
330 if (kingsun->rx_urb) {
331 usb_free_urb(kingsun->rx_urb);
332 kingsun->rx_urb = NULL;
334 if (kingsun->rx_buff.skb) {
335 kfree_skb(kingsun->rx_buff.skb);
336 kingsun->rx_buff.skb = NULL;
337 kingsun->rx_buff.head = NULL;
343 * Function kingsun_net_close (kingsun)
345 * Network device is taken down. Usually this is done by
346 * "ifconfig irda0 down"
348 static int kingsun_net_close(struct net_device *netdev)
350 struct kingsun_cb *kingsun = netdev_priv(netdev);
352 /* Stop transmit processing */
353 netif_stop_queue(netdev);
355 /* Mop up receive && transmit urb's */
356 usb_kill_urb(kingsun->tx_urb);
357 usb_kill_urb(kingsun->rx_urb);
359 usb_free_urb(kingsun->tx_urb);
360 usb_free_urb(kingsun->rx_urb);
362 kingsun->tx_urb = NULL;
363 kingsun->rx_urb = NULL;
365 kfree_skb(kingsun->rx_buff.skb);
366 kingsun->rx_buff.skb = NULL;
367 kingsun->rx_buff.head = NULL;
368 kingsun->rx_buff.in_frame = FALSE;
369 kingsun->rx_buff.state = OUTSIDE_FRAME;
370 kingsun->receiving = 0;
372 /* Stop and remove instance of IrLAP */
374 irlap_close(kingsun->irlap);
376 kingsun->irlap = NULL;
382 * IOCTLs : Extra out-of-band network commands...
384 static int kingsun_net_ioctl(struct net_device *netdev, struct ifreq *rq,
387 struct if_irda_req *irq = (struct if_irda_req *) rq;
388 struct kingsun_cb *kingsun = netdev_priv(netdev);
392 case SIOCSBANDWIDTH: /* Set bandwidth */
393 if (!capable(CAP_NET_ADMIN))
396 /* Check if the device is still there */
397 if (netif_device_present(kingsun->netdev))
398 /* No observed commands for speed change */
402 case SIOCSMEDIABUSY: /* Set media busy */
403 if (!capable(CAP_NET_ADMIN))
406 /* Check if the IrDA stack is still there */
407 if (netif_running(kingsun->netdev))
408 irda_device_set_media_busy(kingsun->netdev, TRUE);
412 /* Only approximately true */
413 irq->ifr_receiving = kingsun->receiving;
424 * Get device stats (for /proc/net/dev and ifconfig)
426 static struct net_device_stats *
427 kingsun_net_get_stats(struct net_device *netdev)
429 struct kingsun_cb *kingsun = netdev_priv(netdev);
430 return &kingsun->stats;
434 * This routine is called by the USB subsystem for each new device
435 * in the system. We need to check if the device is ours, and in
436 * this case start handling it.
438 static int kingsun_probe(struct usb_interface *intf,
439 const struct usb_device_id *id)
441 struct usb_host_interface *interface;
442 struct usb_endpoint_descriptor *endpoint;
444 struct usb_device *dev = interface_to_usbdev(intf);
445 struct kingsun_cb *kingsun = NULL;
446 struct net_device *net = NULL;
448 int pipe, maxp_in, maxp_out;
452 /* Check that there really are two interrupt endpoints.
453 Check based on the one in drivers/usb/input/usbmouse.c
455 interface = intf->cur_altsetting;
456 if (interface->desc.bNumEndpoints != 2) {
457 err("kingsun-sir: expected 2 endpoints, found %d",
458 interface->desc.bNumEndpoints);
461 endpoint = &interface->endpoint[KINGSUN_EP_IN].desc;
462 if (!usb_endpoint_is_int_in(endpoint)) {
463 err("kingsun-sir: endpoint 0 is not interrupt IN");
467 ep_in = endpoint->bEndpointAddress;
468 pipe = usb_rcvintpipe(dev, ep_in);
469 maxp_in = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
470 if (maxp_in > 255 || maxp_in <= 1) {
471 err("%s: endpoint 0 has max packet size %d not in range",
476 endpoint = &interface->endpoint[KINGSUN_EP_OUT].desc;
477 if (!usb_endpoint_is_int_out(endpoint)) {
478 err("kingsun-sir: endpoint 1 is not interrupt OUT");
482 ep_out = endpoint->bEndpointAddress;
483 pipe = usb_sndintpipe(dev, ep_out);
484 maxp_out = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
486 /* Allocate network device container. */
487 net = alloc_irdadev(sizeof(*kingsun));
491 SET_MODULE_OWNER(net);
492 SET_NETDEV_DEV(net, &intf->dev);
493 kingsun = netdev_priv(net);
494 kingsun->irlap = NULL;
495 kingsun->tx_urb = NULL;
496 kingsun->rx_urb = NULL;
497 kingsun->ep_in = ep_in;
498 kingsun->ep_out = ep_out;
499 kingsun->in_buf = NULL;
500 kingsun->out_buf = NULL;
501 kingsun->max_rx = (__u8)maxp_in;
502 kingsun->max_tx = (__u8)maxp_out;
503 kingsun->netdev = net;
504 kingsun->usbdev = dev;
505 kingsun->rx_buff.in_frame = FALSE;
506 kingsun->rx_buff.state = OUTSIDE_FRAME;
507 kingsun->rx_buff.skb = NULL;
508 kingsun->receiving = 0;
509 spin_lock_init(&kingsun->lock);
511 /* Allocate input buffer */
512 kingsun->in_buf = (__u8 *)kmalloc(kingsun->max_rx, GFP_KERNEL);
513 if (!kingsun->in_buf)
516 /* Allocate output buffer */
517 kingsun->out_buf = (__u8 *)kmalloc(KINGSUN_FIFO_SIZE, GFP_KERNEL);
518 if (!kingsun->out_buf)
521 printk(KERN_INFO "KingSun/DonShine IRDA/USB found at address %d, "
522 "Vendor: %x, Product: %x\n",
523 dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
524 le16_to_cpu(dev->descriptor.idProduct));
526 /* Initialize QoS for this device */
527 irda_init_max_qos_capabilies(&kingsun->qos);
529 /* That's the Rx capability. */
530 kingsun->qos.baud_rate.bits &= IR_9600;
531 kingsun->qos.min_turn_time.bits &= KINGSUN_MTT;
532 irda_qos_bits_to_value(&kingsun->qos);
534 /* Override the network functions we need to use */
535 net->hard_start_xmit = kingsun_hard_xmit;
536 net->open = kingsun_net_open;
537 net->stop = kingsun_net_close;
538 net->get_stats = kingsun_net_get_stats;
539 net->do_ioctl = kingsun_net_ioctl;
541 ret = register_netdev(net);
545 info("IrDA: Registered KingSun/DonShine device %s", net->name);
547 usb_set_intfdata(intf, kingsun);
549 /* Situation at this point:
550 - all work buffers allocated
551 - urbs not allocated, set to NULL
552 - max rx packet known (in max_rx)
553 - unwrap state machine (partially) initialized, but skb == NULL
559 if (kingsun->out_buf) kfree(kingsun->out_buf);
560 if (kingsun->in_buf) kfree(kingsun->in_buf);
567 * The current device is removed, the USB layer tell us to shut it down...
569 static void kingsun_disconnect(struct usb_interface *intf)
571 struct kingsun_cb *kingsun = usb_get_intfdata(intf);
576 unregister_netdev(kingsun->netdev);
578 /* Mop up receive && transmit urb's */
579 if (kingsun->tx_urb != NULL) {
580 usb_kill_urb(kingsun->tx_urb);
581 usb_free_urb(kingsun->tx_urb);
582 kingsun->tx_urb = NULL;
584 if (kingsun->rx_urb != NULL) {
585 usb_kill_urb(kingsun->rx_urb);
586 usb_free_urb(kingsun->rx_urb);
587 kingsun->rx_urb = NULL;
590 kfree(kingsun->out_buf);
591 kfree(kingsun->in_buf);
592 free_netdev(kingsun->netdev);
594 usb_set_intfdata(intf, NULL);
598 /* USB suspend, so power off the transmitter/receiver */
599 static int kingsun_suspend(struct usb_interface *intf, pm_message_t message)
601 struct kingsun_cb *kingsun = usb_get_intfdata(intf);
603 netif_device_detach(kingsun->netdev);
604 if (kingsun->tx_urb != NULL) usb_kill_urb(kingsun->tx_urb);
605 if (kingsun->rx_urb != NULL) usb_kill_urb(kingsun->rx_urb);
609 /* Coming out of suspend, so reset hardware */
610 static int kingsun_resume(struct usb_interface *intf)
612 struct kingsun_cb *kingsun = usb_get_intfdata(intf);
614 if (kingsun->rx_urb != NULL)
615 usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
616 netif_device_attach(kingsun->netdev);
623 * USB device callbacks
625 static struct usb_driver irda_driver = {
626 .name = "kingsun-sir",
627 .probe = kingsun_probe,
628 .disconnect = kingsun_disconnect,
631 .suspend = kingsun_suspend,
632 .resume = kingsun_resume,
639 static int __init kingsun_init(void)
641 return usb_register(&irda_driver);
643 module_init(kingsun_init);
648 static void __exit kingsun_cleanup(void)
650 /* Deregister the driver and remove all pending instances */
651 usb_deregister(&irda_driver);
653 module_exit(kingsun_cleanup);
655 MODULE_AUTHOR("Alex Villac�s Lasso <a_villacis@palosanto.com>");
656 MODULE_DESCRIPTION("IrDA-USB Dongle Driver for KingSun/DonShine");
657 MODULE_LICENSE("GPL");