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