/*****************************************************************************
*
* Filename: kingsun-sir.c
* Version: 0.1.1
* Description: Irda KingSun/DonShine USB Dongle
* Status: Experimental
* Author: Alex Villacís Lasso <a_villacis@palosanto.com>
*
* Based on stir4200 and mcs7780 drivers, with (strange?) differences
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*****************************************************************************/
/*
* This is my current (2007-04-25) understanding of how this dongle is supposed
* to work. This is based on reverse-engineering and examination of the packet
* data sent and received by the WinXP driver using USBSnoopy. Feel free to
* update here as more of this dongle is known:
*
* General: Unlike the other USB IrDA dongles, this particular dongle exposes,
* not two bulk (in and out) endpoints, but two *interrupt* ones. This dongle,
* like the bulk based ones (stir4200.c and mcs7780.c), requires polling in
* order to receive data.
* Transmission: Just like stir4200, this dongle uses a raw stream of data,
* which needs to be wrapped and escaped in a similar way as in stir4200.c.
* Reception: Poll-based, as in stir4200. Each read returns the contents of a
* 8-byte buffer, of which the first byte (LSB) indicates the number of bytes
* (1-7) of valid data contained within the remaining 7 bytes. For example, if
* the buffer had the following contents:
* 06 ff ff ff c0 01 04 aa
* This means that (06) there are 6 bytes of valid data. The byte 0xaa at the
* end is garbage (left over from a previous reception) and is discarded.
* If a read returns an "impossible" value as the length of valid data (such as
* 0x36) in the first byte, then the buffer is uninitialized (as is the case of
* first plug-in) and its contents should be discarded. There is currently no
* evidence that the top 5 bits of the 1st byte of the buffer can have values
* other than 0 once reception begins.
* Once valid bytes are collected, the assembled stream is a sequence of
* wrapped IrDA frames that is unwrapped and unescaped as in stir4200.c.
* BIG FAT WARNING: the dongle does *not* reset the RX buffer in any way after
* a successful read from the host, which means that in absence of further
* reception, repeated reads from the dongle will return the exact same
* contents repeatedly. Attempts to be smart and cache a previous read seem
* to result in corrupted packets, so this driver depends on the unwrap logic
* to sort out any repeated reads.
* Speed change: no commands observed so far to change speed, assumed fixed
* 9600bps (SIR).
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/device.h>
#include <linux/crc32.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include <net/irda/irda.h>
#include <net/irda/wrapper.h>
#include <net/irda/crc.h>
/*
* According to lsusb, 0x07c0 is assigned to
* "Code Mercenaries Hard- und Software GmbH"
*/
#define KING_VENDOR_ID 0x07c0
#define KING_PRODUCT_ID 0x4200
/* These are the currently known USB ids */
static struct usb_device_id dongles[] = {
/* KingSun Co,Ltd IrDA/USB Bridge */
{ USB_DEVICE(KING_VENDOR_ID, KING_PRODUCT_ID) },
{ }
};
MODULE_DEVICE_TABLE(usb, dongles);
#define KINGSUN_MTT 0x07
#define KINGSUN_FIFO_SIZE 4096
#define KINGSUN_EP_IN 0
#define KINGSUN_EP_OUT 1
struct kingsun_cb {
struct usb_device *usbdev; /* init: probe_irda */
struct net_device *netdev; /* network layer */
struct irlap_cb *irlap; /* The link layer we are binded to */
struct qos_info qos;
__u8 *in_buf; /* receive buffer */
__u8 *out_buf; /* transmit buffer */
__u8 max_rx; /* max. atomic read from dongle
(usually 8), also size of in_buf */
__u8 max_tx; /* max. atomic write to dongle
(usually 8) */
iobuff_t rx_buff; /* receive unwrap state machine */
struct timeval rx_time;
spinlock_t lock;
int receiving;
__u8 ep_in;
__u8 ep_out;
struct urb *tx_urb;
struct urb *rx_urb;
};
/* Callback transmission routine */
static void kingsun_send_irq(struct urb *urb)
{
struct kingsun_cb *kingsun = urb->context;
struct net_device *netdev = kingsun->netdev;
/* in process of stopping, just drop data */
if (!netif_running(kingsun->netdev)) {
err("kingsun_send_irq: Network not running!");
return;
}
/* unlink, shutdown, unplug, other nasties */
if (urb->status != 0) {
err("kingsun_send_irq: urb asynchronously failed - %d",
urb->status);
}
netif_wake_queue(netdev);
}
/*
* Called from net/core when new frame is available.
*/
static netdev_tx_t kingsun_hard_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct kingsun_cb *kingsun;
int wraplen;
int ret = 0;
netif_stop_queue(netdev);
/* the IRDA wrapping routines don't deal with non linear skb */
SKB_LINEAR_ASSERT(skb);
kingsun = netdev_priv(netdev);
spin_lock(&kingsun->lock);
/* Append data to the end of whatever data remains to be transmitted */
wraplen = async_wrap_skb(skb,
kingsun->out_buf,
KINGSUN_FIFO_SIZE);
/* Calculate how much data can be transmitted in this urb */
usb_fill_int_urb(kingsun->tx_urb, kingsun->usbdev,
usb_sndintpipe(kingsun->usbdev, kingsun->ep_out),
kingsun->out_buf, wraplen, kingsun_send_irq,
kingsun, 1);
if ((ret = usb_submit_urb(kingsun->tx_urb, GFP_ATOMIC))) {
err("kingsun_hard_xmit: failed tx_urb submit: %d", ret);
switch (ret) {
case -ENODEV:
case -EPIPE:
break;
default:
netdev->stats.tx_errors++;
netif_start_queue(netdev);
}
} else {
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += skb->len;
}
dev_kfree_skb(skb);
spin_unlock(&kingsun->lock);
return NETDEV_TX_OK;
}
/* Receive callback function */
static void kingsun_rcv_irq(struct urb *urb)
{
struct kingsun_cb *kingsun = urb->context;
int ret;
/* in process of stopping, just drop data */
if (!netif_running(kingsun->netdev)) {
kingsun->receiving = 0;
return;
}
/* unlink, shutdown, unplug, other nasties */
if (urb->status != 0) {
err("kingsun_rcv_irq: urb asynchronously failed - %d",
urb->status);
kingsun->receiving = 0;
return;
}
if (urb->actual_length == kingsun->max_rx) {
__u8 *bytes = urb->transfer_buffer;
int i;
/* The very first byte in the buffer indicates the length of
valid data in the read. This byte must be in the range
1..kingsun->max_rx -1 . Values outside this range indicate
an uninitialized Rx buffer when the dongle has just been
plugged in. */
if (bytes[0] >= 1 && bytes[0] < kingsun->max_rx) {
for (i = 1; i <= bytes[0]; i++) {
async_unwrap_char(kingsun->netdev,
&kingsun->netdev->stats,
&kingsun->rx_buff, bytes[i]);
}
do_gettimeofday(&kingsun->rx_time);
kingsun->receiving =
(kingsun->rx_buff.state != OUTSIDE_FRAME)
? 1 : 0;
}
} else if (urb->actual_length > 0) {
err("%s(): Unexpected response length, expected %d got %d",
__func__, kingsun->max_rx, urb->actual_length);
}
/* This urb has already been filled in kingsun_net_open */
ret = usb_submit_urb(urb, GFP_ATOMIC);
}
/*
* Function kingsun_net_open (dev)
*
* Network device is taken up. Usually this is done by "ifconfig irda0 up"
*/
static int kingsun_net_open(struct net_device *netdev)
{
struct kingsun_cb *kingsun = netdev_priv(netdev);
int err = -ENOMEM;
char hwname[16];
/* At this point, urbs are NULL, and skb is NULL (see kingsun_probe) */
kingsun->receiving = 0;
/* Initialize for SIR to copy data directly into skb. */
kingsun->rx_buff.in_frame = FALSE;
kingsun->rx_buff.state = OUTSIDE_FRAME;
kingsun->rx_buff.truesize = IRDA_SKB_MAX_MTU;
kingsun->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
if (!kingsun->rx_buff.skb)
goto free_mem;
skb_reserve(kingsun->rx_buff.skb, 1);
kingsun->rx_buff.head = kingsun->rx_buff.skb->data;
do_gettimeofday(&kingsun->rx_time);
kingsun->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!kingsun->rx_urb)
goto free_mem;
kingsun->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!kingsun->tx_urb)
goto free_mem;
/*
* Now that everything should be initialized properly,
* Open new IrLAP layer instance to take care of us...
*/
sprintf(hwname, "usb#%d", kingsun->usbdev->devnum);
kingsun->irlap = irlap_open(netdev, &kingsun->qos, hwname);
if (!kingsun->irlap) {
err("kingsun-sir: irlap_open failed");
goto free_mem;
}
/* Start first reception */
usb_fill_int_urb(kingsun->rx_urb, kingsun->usbdev,
usb_rcvintpipe(kingsun->usbdev, kingsun->ep_in),
kingsun->in_buf, kingsun->max_rx,
kingsun_rcv_irq, kingsun, 1);
kingsun->rx_urb->status = 0;
err = usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
if (err) {
err("kingsun-sir: first urb-submit failed: %d", err);
goto close_irlap;
}
netif_start_queue(netdev);
/* Situation at this point:
- all work buffers allocated
- urbs allocated and ready to fill
- max rx packet known (in max_rx)
- unwrap state machine initialized, in state outside of any frame
- receive request in progress
- IrLAP layer started, about to hand over packets to send
*/
return 0;
close_irlap:
irlap_close(kingsun->irlap);
free_mem:
if (kingsun->tx_urb) {
usb_free_urb(kingsun->tx_urb);
kingsun->tx_urb = NULL;
}
if (kingsun->rx_urb) {
usb_free_urb(kingsun->rx_urb);
kingsun->rx_urb = NULL;
}
if (kingsun->rx_buff.skb) {
kfree_skb(kingsun->rx_buff.skb);
kingsun->rx_buff.skb = NULL;
kingsun->rx_buff.head = NULL;
}
return err;
}
/*
* Function kingsun_net_close (kingsun)
*
* Network device is taken down. Usually this is done by
* "ifconfig irda0 down"
*/
static int kingsun_net_close(struct net_device *netdev)
{
struct kingsun_cb *kingsun = netdev_priv(netdev);
/* Stop transmit processing */
netif_stop_queue(netdev);
/* Mop up receive && transmit urb's */
usb_kill_urb(kingsun->tx_urb);
usb_kill_urb(kingsun->rx_urb);
usb_free_urb(kingsun->tx_urb);
usb_free_urb(kingsun->rx_urb);
kingsun->tx_urb = NULL;
kingsun->rx_urb = NULL;
kfree_skb(kingsun->rx_buff.skb);
kingsun->rx_buff.skb = NULL;
kingsun->rx_buff.head = NULL;
kingsun->rx_buff.in_frame = FALSE;
kingsun->rx_buff.state = OUTSIDE_FRAME;
kingsun->receiving = 0;
/* Stop and remove instance of IrLAP */
if (kingsun->irlap)
irlap_close(kingsun->irlap);
kingsun->irlap = NULL;
return 0;
}
/*
* IOCTLs : Extra out-of-band network commands...
*/
static int kingsun_net_ioctl(struct net_device *netdev, struct ifreq *rq,
int cmd)
{
struct if_irda_req *irq = (struct if_irda_req *) rq;
struct kingsun_cb *kingsun = netdev_priv(netdev);
int ret = 0;
switch (cmd) {
case SIOCSBANDWIDTH: /* Set bandwidth */
if (!capable(CAP_NET_ADMIN))
return -EPERM;
/* Check if the device is still there */
if (netif_device_present(kingsun->netdev))
/* No observed commands for speed change */
ret = -EOPNOTSUPP;
break;
case SIOCSMEDIABUSY: /* Set media busy */
if (!capable(CAP_NET_ADMIN))
return -EPERM;
/* Check if the IrDA stack is still there */
if (netif_running(kingsun->netdev))
irda_device_set_media_busy(kingsun->netdev, TRUE);
break;
case SIOCGRECEIVING:
/* Only approximately true */
irq->ifr_receiving = kingsun->receiving;
break;
default:
ret = -EOPNOTSUPP;
}
return ret;
}
static const struct net_device_ops kingsun_ops = {
.ndo_start_xmit = kingsun_hard_xmit,
.ndo_open = kingsun_net_open,
.ndo_stop = kingsun_net_close,
.ndo_do_ioctl = kingsun_net_ioctl,
};
/*
* This routine is called by the USB subsystem for each new device
* in the system. We need to check if the device is ours, and in
* this case start handling it.
*/
static int kingsun_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_host_interface *interface;
struct usb_endpoint_descriptor *endpoint;
struct usb_device *dev = interface_to_usbdev(intf);
struct kingsun_cb *kingsun = NULL;
struct net_device *net = NULL;
int ret = -ENOMEM;
int pipe, maxp_in, maxp_out;
__u8 ep_in;
__u8 ep_out;
/* Check that there really are two interrupt endpoints.
Check based on the one in drivers/usb/input/usbmouse.c
*/
interface = intf->cur_altsetting;
if (interface->desc.bNumEndpoints != 2) {
err("kingsun-sir: expected 2 endpoints, found %d",
interface->desc.bNumEndpoints);
return -ENODEV;
}
endpoint = &interface->endpoint[KINGSUN_EP_IN].desc;
if (!usb_endpoint_is_int_in(endpoint)) {
err("kingsun-sir: endpoint 0 is not interrupt IN");
return -ENODEV;
}
ep_in = endpoint->bEndpointAddress;
pipe = usb_rcvintpipe(dev, ep_in);
maxp_in = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
if (maxp_in > 255 || maxp_in <= 1) {
err("%s: endpoint 0 has max packet size %d not in range",
__FILE__, maxp_in);
return -ENODEV;
}
endpoint = &interface->endpoint[KINGSUN_EP_OUT].desc;
if (!usb_endpoint_is_int_out(endpoint)) {
err("kingsun-sir: endpoint 1 is not interrupt OUT");
return -ENODEV;
}
ep_out = endpoint->bEndpointAddress;
pipe = usb_sndintpipe(dev, ep_out);
maxp_out = usb_maxpacket(dev, pipe, usb_pipeout(pipe));
/* Allocate network device container. */
net = alloc_irdadev(sizeof(*kingsun));
if(!net)
goto err_out1;
SET_NETDEV_DEV(net, &intf->dev);
kingsun = netdev_priv(net);
kingsun->irlap = NULL;
kingsun->tx_urb = NULL;
kingsun->rx_urb = NULL;
kingsun->ep_in = ep_in;
kingsun->ep_out = ep_out;
kingsun->in_buf = NULL;
kingsun->out_buf = NULL;
kingsun->max_rx = (__u8)maxp_in;
kingsun->max_tx = (__u8)maxp_out;
kingsun->netdev = net;
kingsun->usbdev = dev;
kingsun->rx_buff.in_frame = FALSE;
kingsun->rx_buff.state = OUTSIDE_FRAME;
kingsun->rx_buff.skb = NULL;
kingsun->receiving = 0;
spin_lock_init(&kingsun->lock);
/* Allocate input buffer */
kingsun->in_buf = kmalloc(kingsun->max_rx, GFP_KERNEL);
if (!kingsun->in_buf)
goto free_mem;
/* Allocate output buffer */
kingsun->out_buf = kmalloc(KINGSUN_FIFO_SIZE, GFP_KERNEL);
if (!kingsun->out_buf)
goto free_mem;
printk(KERN_INFO "KingSun/DonShine IRDA/USB found at address %d, "
"Vendor: %x, Product: %x\n",
dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
le16_to_cpu(dev->descriptor.idProduct));
/* Initialize QoS for this device */
irda_init_max_qos_capabilies(&kingsun->qos);
/* That's the Rx capability. */
kingsun->qos.baud_rate.bits &= IR_9600;
kingsun->qos.min_turn_time.bits &= KINGSUN_MTT;
irda_qos_bits_to_value(&kingsun->qos);
/* Override the network functions we need to use */
net->netdev_ops = &kingsun_ops;
ret = register_netdev(net);
if (ret != 0)
goto free_mem;
dev_info(&net->dev, "IrDA: Registered KingSun/DonShine device %s\n",
net->name);
usb_set_intfdata(intf, kingsun);
/* Situation at this point:
- all work buffers allocated
- urbs not allocated, set to NULL
- max rx packet known (in max_rx)
- unwrap state machine (partially) initialized, but skb == NULL
*/
return 0;
free_mem:
if (kingsun->out_buf) kfree(kingsun->out_buf);
if (kingsun->in_buf) kfree(kingsun->in_buf);
free_netdev(net);
err_out1:
return ret;
}
/*
* The current device is removed, the USB layer tell us to shut it down...
*/
static void kingsun_disconnect(struct usb_interface *intf)
{
struct kingsun_cb *kingsun = usb_get_intfdata(intf);
if (!kingsun)
return;
unregister_netdev(kingsun->netdev);
/* Mop up receive && transmit urb's */
if (kingsun->tx_urb != NULL) {
usb_kill_urb(kingsun->tx_urb);
usb_free_urb(kingsun->tx_urb);
kingsun->tx_urb = NULL;
}
if (kingsun->rx_urb != NULL) {
usb_kill_urb(kingsun->rx_urb);
usb_free_urb(kingsun->rx_urb);
kingsun->rx_urb = NULL;
}
kfree(kingsun->out_buf);
kfree(kingsun->in_buf);
free_netdev(kingsun->netdev);
usb_set_intfdata(intf, NULL);
}
#ifdef CONFIG_PM
/* USB suspend, so power off the transmitter/receiver */
static int kingsun_suspend(struct usb_interface *intf, pm_message_t message)
{
struct kingsun_cb *kingsun = usb_get_intfdata(intf);
netif_device_detach(kingsun->netdev);
if (kingsun->tx_urb != NULL) usb_kill_urb(kingsun->tx_urb);
if (kingsun->rx_urb != NULL) usb_kill_urb(kingsun->rx_urb);
return 0;
}
/* Coming out of suspend, so reset hardware */
static int kingsun_resume(struct usb_interface *intf)
{
struct kingsun_cb *kingsun = usb_get_intfdata(intf);
if (kingsun->rx_urb != NULL)
usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
netif_device_attach(kingsun->netdev);
return 0;
}
#endif
/*
* USB device callbacks
*/
static struct usb_driver irda_driver = {
.name = "kingsun-sir",
.probe = kingsun_probe,
.disconnect = kingsun_disconnect,
.id_table = dongles,
#ifdef CONFIG_PM
.suspend = kingsun_suspend,
.resume = kingsun_resume,
#endif
};
/*
* Module insertion
*/
static int __init kingsun_init(void)
{
return usb_register(&irda_driver);
}
module_init(kingsun_init);
/*
* Module removal
*/
static void __exit kingsun_cleanup(void)
{
/* Deregister the driver and remove all pending instances */
usb_deregister(&irda_driver);
}
module_exit(kingsun_cleanup);
MODULE_AUTHOR("Alex Villacís Lasso <a_villacis@palosanto.com>");
MODULE_DESCRIPTION("IrDA-USB Dongle Driver for KingSun/DonShine");
MODULE_LICENSE("GPL");