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linux/drivers/net/irda/ks959-sir.c

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/*****************************************************************************
*
* Filename: ks959-sir.c
* Version: 0.1.2
* Description: Irda KingSun KS-959 USB Dongle
* Status: Experimental
* Author: Alex Villacís Lasso <a_villacis@palosanto.com>
* with help from Domen Puncer <domen@coderock.org>
*
* Based on stir4200, mcs7780, kingsun-sir drivers.
*
* 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.
*
*****************************************************************************/
/*
* Following is my most current (2007-07-17) understanding of how the Kingsun
* KS-959 dongle is supposed to work. This information was deduced by
* reverse-engineering and examining the USB traffic captured with USBSnoopy
* from the WinXP driver. Feel free to update here as more of the dongle is
* known.
*
* My most sincere thanks must go to Domen Puncer <domen@coderock.org> for
* invaluable help in cracking the obfuscation and padding required for this
* dongle.
*
* General: This dongle exposes one interface with one interrupt IN endpoint.
* However, the interrupt endpoint is NOT used at all for this dongle. Instead,
* this dongle uses control transfers for everything, including sending and
* receiving the IrDA frame data. Apparently the interrupt endpoint is just a
* dummy to ensure the dongle has a valid interface to present to the PC.And I
* thought the DonShine dongle was weird... In addition, this dongle uses
* obfuscation (?!?!), applied at the USB level, to hide the traffic, both sent
* and received, from the dongle. I call it obfuscation because the XOR keying
* and padding required to produce an USB traffic acceptable for the dongle can
* not be explained by any other technical requirement.
*
* Transmission: To transmit an IrDA frame, the driver must prepare a control
* URB with the following as a setup packet:
* bRequestType USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE
* bRequest 0x09
* wValue <length of valid data before padding, little endian>
* wIndex 0x0000
* wLength <length of padded data>
* The payload packet must be manually wrapped and escaped (as in stir4200.c),
* then padded and obfuscated before being sent. Both padding and obfuscation
* are implemented in the procedure obfuscate_tx_buffer(). Suffice to say, the
* designer/programmer of the dongle used his name as a source for the
* obfuscation. WTF?!
* Apparently the dongle cannot handle payloads larger than 256 bytes. The
* driver has to perform fragmentation in order to send anything larger than
* this limit.
*
* Reception: To receive data, the driver must poll the dongle regularly (like
* kingsun-sir.c) with control URBs and the following as a setup packet:
* bRequestType USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE
* bRequest 0x01
* wValue 0x0200
* wIndex 0x0000
* wLength 0x0800 (size of available buffer)
* If there is data to be read, it will be returned as the response payload.
* This data is (apparently) not padded, but it is obfuscated. To de-obfuscate
* it, the driver must XOR every byte, in sequence, with a value that starts at
* 1 and is incremented with each byte processed, and then with 0x55. The value
* incremented with each byte processed overflows as an unsigned char. The
* resulting bytes form a wrapped SIR frame that is unwrapped and unescaped
* as in stir4200.c The incremented value is NOT reset with each frame, but is
* kept across the entire session with the dongle. Also, the dongle inserts an
* extra garbage byte with value 0x95 (after decoding) every 0xff bytes, which
* must be skipped.
*
* Speed change: To change the speed of the dongle, the driver prepares a
* control URB with the following as a setup packet:
* bRequestType USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE
* bRequest 0x09
* wValue 0x0200
* wIndex 0x0001
* wLength 0x0008 (length of the payload)
* The payload is a 8-byte record, apparently identical to the one used in
* drivers/usb/serial/cypress_m8.c to change speed:
* __u32 baudSpeed;
* unsigned int dataBits : 2; // 0 - 5 bits 3 - 8 bits
* unsigned int : 1;
* unsigned int stopBits : 1;
* unsigned int parityEnable : 1;
* unsigned int parityType : 1;
* unsigned int : 1;
* unsigned int reset : 1;
* unsigned char reserved[3]; // set to 0
*
* For now only SIR speeds have been observed with this dongle. Therefore,
* nothing is known on what changes (if any) must be done to frame wrapping /
* unwrapping for higher than SIR speeds. This driver assumes no change is
* necessary and announces support for all the way to 57600 bps. Although the
* package announces support for up to 4MBps, tests with a Sony Ericcson K300
* phone show corruption when receiving large frames at 115200 bps, the highest
* speed announced by the phone. However, transmission at 115200 bps is OK. Go
* figure. Since I don't know whether the phone or the dongle is at fault, max
* announced speed is 57600 bps until someone produces a device that can run
* at higher speeds with this dongle.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.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>
#define KS959_VENDOR_ID 0x07d0
#define KS959_PRODUCT_ID 0x4959
/* These are the currently known USB ids */
static struct usb_device_id dongles[] = {
/* KingSun Co,Ltd IrDA/USB Bridge */
{USB_DEVICE(KS959_VENDOR_ID, KS959_PRODUCT_ID)},
{}
};
MODULE_DEVICE_TABLE(usb, dongles);
#define KINGSUN_MTT 0x07
#define KINGSUN_REQ_RECV 0x01
#define KINGSUN_REQ_SEND 0x09
#define KINGSUN_RCV_FIFO_SIZE 2048 /* Max length we can receive */
#define KINGSUN_SND_FIFO_SIZE 2048 /* Max packet we can send */
#define KINGSUN_SND_PACKET_SIZE 256 /* Max packet dongle can handle */
struct ks959_speedparams {
__le32 baudrate; /* baud rate, little endian */
__u8 flags;
__u8 reserved[3];
} __packed;
#define KS_DATA_5_BITS 0x00
#define KS_DATA_6_BITS 0x01
#define KS_DATA_7_BITS 0x02
#define KS_DATA_8_BITS 0x03
#define KS_STOP_BITS_1 0x00
#define KS_STOP_BITS_2 0x08
#define KS_PAR_DISABLE 0x00
#define KS_PAR_EVEN 0x10
#define KS_PAR_ODD 0x30
#define KS_RESET 0x80
struct ks959_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;
struct usb_ctrlrequest *tx_setuprequest;
struct urb *tx_urb;
__u8 *tx_buf_clear;
unsigned int tx_buf_clear_used;
unsigned int tx_buf_clear_sent;
__u8 *tx_buf_xored;
struct usb_ctrlrequest *rx_setuprequest;
struct urb *rx_urb;
__u8 *rx_buf;
__u8 rx_variable_xormask;
iobuff_t rx_unwrap_buff;
struct usb_ctrlrequest *speed_setuprequest;
struct urb *speed_urb;
struct ks959_speedparams speedparams;
unsigned int new_speed;
spinlock_t lock;
int receiving;
};
/* Procedure to perform the obfuscation/padding expected by the dongle
*
* buf_cleartext (IN) Cleartext version of the IrDA frame to transmit
* len_cleartext (IN) Length of the cleartext version of IrDA frame
* buf_xoredtext (OUT) Obfuscated version of frame built by proc
* len_maxbuf (OUT) Maximum space available at buf_xoredtext
*
* (return) length of obfuscated frame with padding
*
* If not enough space (as indicated by len_maxbuf vs. required padding),
* zero is returned
*
* The value of lookup_string is actually a required portion of the algorithm.
* Seems the designer of the dongle wanted to state who exactly is responsible
* for implementing obfuscation. Send your best (or other) wishes to him ]:-)
*/
static unsigned int obfuscate_tx_buffer(const __u8 * buf_cleartext,
unsigned int len_cleartext,
__u8 * buf_xoredtext,
unsigned int len_maxbuf)
{
unsigned int len_xoredtext;
/* Calculate required length with padding, check for necessary space */
len_xoredtext = ((len_cleartext + 7) & ~0x7) + 0x10;
if (len_xoredtext <= len_maxbuf) {
static const __u8 lookup_string[] = "wangshuofei19710";
__u8 xor_mask;
/* Unlike the WinXP driver, we *do* clear out the padding */
memset(buf_xoredtext, 0, len_xoredtext);
xor_mask = lookup_string[(len_cleartext & 0x0f) ^ 0x06] ^ 0x55;
while (len_cleartext-- > 0) {
*buf_xoredtext++ = *buf_cleartext++ ^ xor_mask;
}
} else {
len_xoredtext = 0;
}
return len_xoredtext;
}
/* Callback transmission routine */
static void ks959_speed_irq(struct urb *urb)
{
/* unlink, shutdown, unplug, other nasties */
if (urb->status != 0) {
dev_err(&urb->dev->dev,
"ks959_speed_irq: urb asynchronously failed - %d\n",
urb->status);
}
}
/* Send a control request to change speed of the dongle */
static int ks959_change_speed(struct ks959_cb *kingsun, unsigned speed)
{
static unsigned int supported_speeds[] = { 2400, 9600, 19200, 38400,
57600, 115200, 576000, 1152000, 4000000, 0
};
int err;
unsigned int i;
if (kingsun->speed_setuprequest == NULL || kingsun->speed_urb == NULL)
return -ENOMEM;
/* Check that requested speed is among the supported ones */
for (i = 0; supported_speeds[i] && supported_speeds[i] != speed; i++) ;
if (supported_speeds[i] == 0)
return -EOPNOTSUPP;
memset(&(kingsun->speedparams), 0, sizeof(struct ks959_speedparams));
kingsun->speedparams.baudrate = cpu_to_le32(speed);
kingsun->speedparams.flags = KS_DATA_8_BITS;
/* speed_setuprequest pre-filled in ks959_probe */
usb_fill_control_urb(kingsun->speed_urb, kingsun->usbdev,
usb_sndctrlpipe(kingsun->usbdev, 0),
(unsigned char *)kingsun->speed_setuprequest,
&(kingsun->speedparams),
sizeof(struct ks959_speedparams), ks959_speed_irq,
kingsun);
kingsun->speed_urb->status = 0;
err = usb_submit_urb(kingsun->speed_urb, GFP_ATOMIC);
return err;
}
/* Submit one fragment of an IrDA frame to the dongle */
static void ks959_send_irq(struct urb *urb);
static int ks959_submit_tx_fragment(struct ks959_cb *kingsun)
{
unsigned int padlen;
unsigned int wraplen;
int ret;
/* Check whether current plaintext can produce a padded buffer that fits
within the range handled by the dongle */
wraplen = (KINGSUN_SND_PACKET_SIZE & ~0x7) - 0x10;
if (wraplen > kingsun->tx_buf_clear_used)
wraplen = kingsun->tx_buf_clear_used;
/* Perform dongle obfuscation. Also remove the portion of the frame that
was just obfuscated and will now be sent to the dongle. */
padlen = obfuscate_tx_buffer(kingsun->tx_buf_clear, wraplen,
kingsun->tx_buf_xored,
KINGSUN_SND_PACKET_SIZE);
/* Calculate how much data can be transmitted in this urb */
kingsun->tx_setuprequest->wValue = cpu_to_le16(wraplen);
kingsun->tx_setuprequest->wLength = cpu_to_le16(padlen);
/* Rest of the fields were filled in ks959_probe */
usb_fill_control_urb(kingsun->tx_urb, kingsun->usbdev,
usb_sndctrlpipe(kingsun->usbdev, 0),
(unsigned char *)kingsun->tx_setuprequest,
kingsun->tx_buf_xored, padlen,
ks959_send_irq, kingsun);
kingsun->tx_urb->status = 0;
ret = usb_submit_urb(kingsun->tx_urb, GFP_ATOMIC);
/* Remember how much data was sent, in order to update at callback */
kingsun->tx_buf_clear_sent = (ret == 0) ? wraplen : 0;
return ret;
}
/* Callback transmission routine */
static void ks959_send_irq(struct urb *urb)
{
struct ks959_cb *kingsun = urb->context;
struct net_device *netdev = kingsun->netdev;
int ret = 0;
/* in process of stopping, just drop data */
if (!netif_running(kingsun->netdev)) {
dev_err(&kingsun->usbdev->dev,
"ks959_send_irq: Network not running!\n");
return;
}
/* unlink, shutdown, unplug, other nasties */
if (urb->status != 0) {
dev_err(&kingsun->usbdev->dev,
"ks959_send_irq: urb asynchronously failed - %d\n",
urb->status);
return;
}
if (kingsun->tx_buf_clear_used > 0) {
/* Update data remaining to be sent */
if (kingsun->tx_buf_clear_sent < kingsun->tx_buf_clear_used) {
memmove(kingsun->tx_buf_clear,
kingsun->tx_buf_clear +
kingsun->tx_buf_clear_sent,
kingsun->tx_buf_clear_used -
kingsun->tx_buf_clear_sent);
}
kingsun->tx_buf_clear_used -= kingsun->tx_buf_clear_sent;
kingsun->tx_buf_clear_sent = 0;
if (kingsun->tx_buf_clear_used > 0) {
/* There is more data to be sent */
if ((ret = ks959_submit_tx_fragment(kingsun)) != 0) {
dev_err(&kingsun->usbdev->dev,
"ks959_send_irq: failed tx_urb submit: %d\n",
ret);
switch (ret) {
case -ENODEV:
case -EPIPE:
break;
default:
netdev->stats.tx_errors++;
netif_start_queue(netdev);
}
}
} else {
/* All data sent, send next speed && wake network queue */
if (kingsun->new_speed != -1 &&
cpu_to_le32(kingsun->new_speed) !=
kingsun->speedparams.baudrate)
ks959_change_speed(kingsun, kingsun->new_speed);
netif_wake_queue(netdev);
}
}
}
/*
* Called from net/core when new frame is available.
*/
static netdev_tx_t ks959_hard_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct ks959_cb *kingsun;
unsigned 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);
kingsun->new_speed = irda_get_next_speed(skb);
/* Append data to the end of whatever data remains to be transmitted */
wraplen =
async_wrap_skb(skb, kingsun->tx_buf_clear, KINGSUN_SND_FIFO_SIZE);
kingsun->tx_buf_clear_used = wraplen;
if ((ret = ks959_submit_tx_fragment(kingsun)) != 0) {
dev_err(&kingsun->usbdev->dev,
"ks959_hard_xmit: failed tx_urb submit: %d\n", 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 ks959_rcv_irq(struct urb *urb)
{
struct ks959_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) {
dev_err(&kingsun->usbdev->dev,
"kingsun_rcv_irq: urb asynchronously failed - %d\n",
urb->status);
kingsun->receiving = 0;
return;
}
if (urb->actual_length > 0) {
__u8 *bytes = urb->transfer_buffer;
unsigned int i;
for (i = 0; i < urb->actual_length; i++) {
/* De-obfuscation implemented here: variable portion of
xormask is incremented, and then used with the encoded
byte for the XOR. The result of the operation is used
to unwrap the SIR frame. */
kingsun->rx_variable_xormask++;
bytes[i] =
bytes[i] ^ kingsun->rx_variable_xormask ^ 0x55u;
/* rx_variable_xormask doubles as an index counter so we
can skip the byte at 0xff (wrapped around to 0).
*/
if (kingsun->rx_variable_xormask != 0) {
async_unwrap_char(kingsun->netdev,
&kingsun->netdev->stats,
&kingsun->rx_unwrap_buff,
bytes[i]);
}
}
kingsun->receiving =
(kingsun->rx_unwrap_buff.state != OUTSIDE_FRAME) ? 1 : 0;
}
/* This urb has already been filled in kingsun_net_open. Setup
packet must be re-filled, but it is assumed that urb keeps the
pointer to the initial setup packet, as well as the payload buffer.
Setup packet is already pre-filled at ks959_probe.
*/
urb->status = 0;
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 ks959_net_open(struct net_device *netdev)
{
struct ks959_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_unwrap_buff.in_frame = FALSE;
kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
kingsun->rx_unwrap_buff.truesize = IRDA_SKB_MAX_MTU;
kingsun->rx_unwrap_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
if (!kingsun->rx_unwrap_buff.skb)
goto free_mem;
skb_reserve(kingsun->rx_unwrap_buff.skb, 1);
kingsun->rx_unwrap_buff.head = kingsun->rx_unwrap_buff.skb->data;
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;
kingsun->speed_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!kingsun->speed_urb)
goto free_mem;
/* Initialize speed for dongle */
kingsun->new_speed = 9600;
err = ks959_change_speed(kingsun, 9600);
if (err < 0)
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 = -ENOMEM;
dev_err(&kingsun->usbdev->dev, "irlap_open failed\n");
goto free_mem;
}
/* Start reception. Setup request already pre-filled in ks959_probe */
usb_fill_control_urb(kingsun->rx_urb, kingsun->usbdev,
usb_rcvctrlpipe(kingsun->usbdev, 0),
(unsigned char *)kingsun->rx_setuprequest,
kingsun->rx_buf, KINGSUN_RCV_FIFO_SIZE,
ks959_rcv_irq, kingsun);
kingsun->rx_urb->status = 0;
err = usb_submit_urb(kingsun->rx_urb, GFP_KERNEL);
if (err) {
dev_err(&kingsun->usbdev->dev,
"first urb-submit failed: %d\n", 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:
usb_free_urb(kingsun->speed_urb);
kingsun->speed_urb = NULL;
usb_free_urb(kingsun->tx_urb);
kingsun->tx_urb = NULL;
usb_free_urb(kingsun->rx_urb);
kingsun->rx_urb = NULL;
if (kingsun->rx_unwrap_buff.skb) {
kfree_skb(kingsun->rx_unwrap_buff.skb);
kingsun->rx_unwrap_buff.skb = NULL;
kingsun->rx_unwrap_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 ks959_net_close(struct net_device *netdev)
{
struct ks959_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_free_urb(kingsun->tx_urb);
kingsun->tx_urb = NULL;
usb_kill_urb(kingsun->speed_urb);
usb_free_urb(kingsun->speed_urb);
kingsun->speed_urb = NULL;
usb_kill_urb(kingsun->rx_urb);
usb_free_urb(kingsun->rx_urb);
kingsun->rx_urb = NULL;
kfree_skb(kingsun->rx_unwrap_buff.skb);
kingsun->rx_unwrap_buff.skb = NULL;
kingsun->rx_unwrap_buff.head = NULL;
kingsun->rx_unwrap_buff.in_frame = FALSE;
kingsun->rx_unwrap_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 ks959_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
{
struct if_irda_req *irq = (struct if_irda_req *)rq;
struct ks959_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))
return ks959_change_speed(kingsun, irq->ifr_baudrate);
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 ks959_ops = {
.ndo_start_xmit = ks959_hard_xmit,
.ndo_open = ks959_net_open,
.ndo_stop = ks959_net_close,
.ndo_do_ioctl = ks959_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 ks959_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *dev = interface_to_usbdev(intf);
struct ks959_cb *kingsun = NULL;
struct net_device *net = NULL;
int ret = -ENOMEM;
/* 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->netdev = net;
kingsun->usbdev = dev;
kingsun->irlap = NULL;
kingsun->tx_setuprequest = NULL;
kingsun->tx_urb = NULL;
kingsun->tx_buf_clear = NULL;
kingsun->tx_buf_xored = NULL;
kingsun->tx_buf_clear_used = 0;
kingsun->tx_buf_clear_sent = 0;
kingsun->rx_setuprequest = NULL;
kingsun->rx_urb = NULL;
kingsun->rx_buf = NULL;
kingsun->rx_variable_xormask = 0;
kingsun->rx_unwrap_buff.in_frame = FALSE;
kingsun->rx_unwrap_buff.state = OUTSIDE_FRAME;
kingsun->rx_unwrap_buff.skb = NULL;
kingsun->receiving = 0;
spin_lock_init(&kingsun->lock);
kingsun->speed_setuprequest = NULL;
kingsun->speed_urb = NULL;
kingsun->speedparams.baudrate = 0;
/* Allocate input buffer */
kingsun->rx_buf = kmalloc(KINGSUN_RCV_FIFO_SIZE, GFP_KERNEL);
if (!kingsun->rx_buf)
goto free_mem;
/* Allocate input setup packet */
kingsun->rx_setuprequest =
kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
if (!kingsun->rx_setuprequest)
goto free_mem;
kingsun->rx_setuprequest->bRequestType =
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
kingsun->rx_setuprequest->bRequest = KINGSUN_REQ_RECV;
kingsun->rx_setuprequest->wValue = cpu_to_le16(0x0200);
kingsun->rx_setuprequest->wIndex = 0;
kingsun->rx_setuprequest->wLength = cpu_to_le16(KINGSUN_RCV_FIFO_SIZE);
/* Allocate output buffer */
kingsun->tx_buf_clear = kmalloc(KINGSUN_SND_FIFO_SIZE, GFP_KERNEL);
if (!kingsun->tx_buf_clear)
goto free_mem;
kingsun->tx_buf_xored = kmalloc(KINGSUN_SND_PACKET_SIZE, GFP_KERNEL);
if (!kingsun->tx_buf_xored)
goto free_mem;
/* Allocate and initialize output setup packet */
kingsun->tx_setuprequest =
kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
if (!kingsun->tx_setuprequest)
goto free_mem;
kingsun->tx_setuprequest->bRequestType =
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
kingsun->tx_setuprequest->bRequest = KINGSUN_REQ_SEND;
kingsun->tx_setuprequest->wValue = 0;
kingsun->tx_setuprequest->wIndex = 0;
kingsun->tx_setuprequest->wLength = 0;
/* Allocate and initialize speed setup packet */
kingsun->speed_setuprequest =
kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
if (!kingsun->speed_setuprequest)
goto free_mem;
kingsun->speed_setuprequest->bRequestType =
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
kingsun->speed_setuprequest->bRequest = KINGSUN_REQ_SEND;
kingsun->speed_setuprequest->wValue = cpu_to_le16(0x0200);
kingsun->speed_setuprequest->wIndex = cpu_to_le16(0x0001);
kingsun->speed_setuprequest->wLength =
cpu_to_le16(sizeof(struct ks959_speedparams));
printk(KERN_INFO "KingSun KS-959 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);
/* Baud rates known to be supported. Please uncomment if devices (other
than a SonyEriccson K300 phone) can be shown to support higher speed
with this dongle.
*/
kingsun->qos.baud_rate.bits =
IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600;
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 = &ks959_ops;
ret = register_netdev(net);
if (ret != 0)
goto free_mem;
dev_info(&net->dev, "IrDA: Registered KingSun KS-959 device %s\n",
net->name);
usb_set_intfdata(intf, kingsun);
/* Situation at this point:
- all work buffers allocated
- setup requests pre-filled
- urbs not allocated, set to NULL
- max rx packet known (is KINGSUN_FIFO_SIZE)
- unwrap state machine (partially) initialized, but skb == NULL
*/
return 0;
free_mem:
kfree(kingsun->speed_setuprequest);
kfree(kingsun->tx_setuprequest);
kfree(kingsun->tx_buf_xored);
kfree(kingsun->tx_buf_clear);
kfree(kingsun->rx_setuprequest);
kfree(kingsun->rx_buf);
free_netdev(net);
err_out1:
return ret;
}
/*
* The current device is removed, the USB layer tell us to shut it down...
*/
static void ks959_disconnect(struct usb_interface *intf)
{
struct ks959_cb *kingsun = usb_get_intfdata(intf);
if (!kingsun)
return;
unregister_netdev(kingsun->netdev);
/* Mop up receive && transmit urb's */
if (kingsun->speed_urb != NULL) {
usb_kill_urb(kingsun->speed_urb);
usb_free_urb(kingsun->speed_urb);
kingsun->speed_urb = NULL;
}
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->speed_setuprequest);
kfree(kingsun->tx_setuprequest);
kfree(kingsun->tx_buf_xored);
kfree(kingsun->tx_buf_clear);
kfree(kingsun->rx_setuprequest);
kfree(kingsun->rx_buf);
free_netdev(kingsun->netdev);
usb_set_intfdata(intf, NULL);
}
#ifdef CONFIG_PM
/* USB suspend, so power off the transmitter/receiver */
static int ks959_suspend(struct usb_interface *intf, pm_message_t message)
{
struct ks959_cb *kingsun = usb_get_intfdata(intf);
netif_device_detach(kingsun->netdev);
if (kingsun->speed_urb != NULL)
usb_kill_urb(kingsun->speed_urb);
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 ks959_resume(struct usb_interface *intf)
{
struct ks959_cb *kingsun = usb_get_intfdata(intf);
if (kingsun->rx_urb != NULL) {
/* Setup request already filled in ks959_probe */
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 = "ks959-sir",
.probe = ks959_probe,
.disconnect = ks959_disconnect,
.id_table = dongles,
#ifdef CONFIG_PM
.suspend = ks959_suspend,
.resume = ks959_resume,
#endif
};
module_usb_driver(irda_driver);
MODULE_AUTHOR("Alex Villacís Lasso <a_villacis@palosanto.com>");
MODULE_DESCRIPTION("IrDA-USB Dongle Driver for KingSun KS-959");
MODULE_LICENSE("GPL");
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