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|
/*****************************************************************************
*
* 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
|