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75318d2d7c
It is no longer needed, so let's remove it, saving a bit of memory. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
404 lines
10 KiB
C
404 lines
10 KiB
C
/*
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* GeneSys GL620USB-A based links
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* Copyright (C) 2001 by Jiun-Jie Huang <huangjj@genesyslogic.com.tw>
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* Copyright (C) 2001 by Stanislav Brabec <utx@penguin.cz>
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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, or
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* (at your option) any later version.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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// #define DEBUG // error path messages, extra info
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// #define VERBOSE // more; success messages
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/workqueue.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include "usbnet.h"
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/*
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* GeneSys GL620USB-A (www.genesyslogic.com.tw)
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*
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* ... should partially interop with the Win32 driver for this hardware.
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* The GeneSys docs imply there's some NDIS issue motivating this framing.
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*
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* Some info from GeneSys:
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* - GL620USB-A is full duplex; GL620USB is only half duplex for bulk.
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* (Some cables, like the BAFO-100c, use the half duplex version.)
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* - For the full duplex model, the low bit of the version code says
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* which side is which ("left/right").
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* - For the half duplex type, a control/interrupt handshake settles
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* the transfer direction. (That's disabled here, partially coded.)
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* A control URB would block until other side writes an interrupt.
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*
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* Original code from Jiun-Jie Huang <huangjj@genesyslogic.com.tw>
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* and merged into "usbnet" by Stanislav Brabec <utx@penguin.cz>.
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*/
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// control msg write command
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#define GENELINK_CONNECT_WRITE 0xF0
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// interrupt pipe index
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#define GENELINK_INTERRUPT_PIPE 0x03
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// interrupt read buffer size
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#define INTERRUPT_BUFSIZE 0x08
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// interrupt pipe interval value
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#define GENELINK_INTERRUPT_INTERVAL 0x10
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// max transmit packet number per transmit
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#define GL_MAX_TRANSMIT_PACKETS 32
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// max packet length
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#define GL_MAX_PACKET_LEN 1514
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// max receive buffer size
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#define GL_RCV_BUF_SIZE \
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(((GL_MAX_PACKET_LEN + 4) * GL_MAX_TRANSMIT_PACKETS) + 4)
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struct gl_packet {
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u32 packet_length;
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char packet_data [1];
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};
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struct gl_header {
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u32 packet_count;
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struct gl_packet packets;
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};
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#ifdef GENELINK_ACK
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// FIXME: this code is incomplete, not debugged; it doesn't
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// handle interrupts correctly; it should use the generic
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// status IRQ code (which didn't exist back in 2001).
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struct gl_priv {
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struct urb *irq_urb;
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char irq_buf [INTERRUPT_BUFSIZE];
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};
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static inline int gl_control_write(struct usbnet *dev, u8 request, u16 value)
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{
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int retval;
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retval = usb_control_msg(dev->udev,
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usb_sndctrlpipe(dev->udev, 0),
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request,
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USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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value,
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0, // index
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0, // data buffer
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0, // size
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USB_CTRL_SET_TIMEOUT);
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return retval;
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}
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static void gl_interrupt_complete(struct urb *urb, struct pt_regs *regs)
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{
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int status = urb->status;
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switch (status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__FUNCTION__, status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d",
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__FUNCTION__, urb->status);
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}
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status = usb_submit_urb(urb, GFP_ATOMIC);
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if (status)
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err("%s - usb_submit_urb failed with result %d",
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__FUNCTION__, status);
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}
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static int gl_interrupt_read(struct usbnet *dev)
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{
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struct gl_priv *priv = dev->priv_data;
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int retval;
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// issue usb interrupt read
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if (priv && priv->irq_urb) {
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// submit urb
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if ((retval = usb_submit_urb(priv->irq_urb, GFP_KERNEL)) != 0)
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dbg("gl_interrupt_read: submit fail - %X...", retval);
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else
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dbg("gl_interrupt_read: submit success...");
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}
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return 0;
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}
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// check whether another side is connected
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static int genelink_check_connect(struct usbnet *dev)
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{
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int retval;
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dbg("genelink_check_connect...");
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// detect whether another side is connected
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if ((retval = gl_control_write(dev, GENELINK_CONNECT_WRITE, 0)) != 0) {
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dbg("%s: genelink_check_connect write fail - %X",
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dev->net->name, retval);
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return retval;
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}
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// usb interrupt read to ack another side
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if ((retval = gl_interrupt_read(dev)) != 0) {
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dbg("%s: genelink_check_connect read fail - %X",
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dev->net->name, retval);
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return retval;
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}
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dbg("%s: genelink_check_connect read success", dev->net->name);
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return 0;
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}
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// allocate and initialize the private data for genelink
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static int genelink_init(struct usbnet *dev)
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{
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struct gl_priv *priv;
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// allocate the private data structure
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if ((priv = kmalloc(sizeof *priv, GFP_KERNEL)) == 0) {
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dbg("%s: cannot allocate private data per device",
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dev->net->name);
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return -ENOMEM;
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}
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// allocate irq urb
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if ((priv->irq_urb = usb_alloc_urb(0, GFP_KERNEL)) == 0) {
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dbg("%s: cannot allocate private irq urb per device",
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dev->net->name);
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kfree(priv);
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return -ENOMEM;
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}
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// fill irq urb
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usb_fill_int_urb(priv->irq_urb, dev->udev,
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usb_rcvintpipe(dev->udev, GENELINK_INTERRUPT_PIPE),
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priv->irq_buf, INTERRUPT_BUFSIZE,
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gl_interrupt_complete, 0,
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GENELINK_INTERRUPT_INTERVAL);
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// set private data pointer
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dev->priv_data = priv;
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return 0;
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}
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// release the private data
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static int genelink_free(struct usbnet *dev)
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{
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struct gl_priv *priv = dev->priv_data;
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if (!priv)
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return 0;
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// FIXME: can't cancel here; it's synchronous, and
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// should have happened earlier in any case (interrupt
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// handling needs to be generic)
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// cancel irq urb first
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usb_kill_urb(priv->irq_urb);
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// free irq urb
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usb_free_urb(priv->irq_urb);
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// free the private data structure
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kfree(priv);
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return 0;
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}
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#endif
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static int genelink_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
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{
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struct gl_header *header;
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struct gl_packet *packet;
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struct sk_buff *gl_skb;
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u32 size;
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header = (struct gl_header *) skb->data;
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// get the packet count of the received skb
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le32_to_cpus(&header->packet_count);
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if ((header->packet_count > GL_MAX_TRANSMIT_PACKETS)
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|| (header->packet_count < 0)) {
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dbg("genelink: invalid received packet count %d",
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header->packet_count);
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return 0;
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}
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// set the current packet pointer to the first packet
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packet = &header->packets;
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// decrement the length for the packet count size 4 bytes
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skb_pull(skb, 4);
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while (header->packet_count > 1) {
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// get the packet length
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size = le32_to_cpu(packet->packet_length);
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// this may be a broken packet
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if (size > GL_MAX_PACKET_LEN) {
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dbg("genelink: invalid rx length %d", size);
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return 0;
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}
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// allocate the skb for the individual packet
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gl_skb = alloc_skb(size, GFP_ATOMIC);
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if (gl_skb) {
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// copy the packet data to the new skb
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memcpy(skb_put(gl_skb, size),
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packet->packet_data, size);
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usbnet_skb_return(dev, gl_skb);
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}
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// advance to the next packet
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packet = (struct gl_packet *)
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&packet->packet_data [size];
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header->packet_count--;
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// shift the data pointer to the next gl_packet
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skb_pull(skb, size + 4);
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}
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// skip the packet length field 4 bytes
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skb_pull(skb, 4);
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if (skb->len > GL_MAX_PACKET_LEN) {
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dbg("genelink: invalid rx length %d", skb->len);
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return 0;
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}
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return 1;
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}
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static struct sk_buff *
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genelink_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
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{
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int padlen;
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int length = skb->len;
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int headroom = skb_headroom(skb);
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int tailroom = skb_tailroom(skb);
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u32 *packet_count;
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u32 *packet_len;
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// FIXME: magic numbers, bleech
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padlen = ((skb->len + (4 + 4*1)) % 64) ? 0 : 1;
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if ((!skb_cloned(skb))
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&& ((headroom + tailroom) >= (padlen + (4 + 4*1)))) {
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if ((headroom < (4 + 4*1)) || (tailroom < padlen)) {
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skb->data = memmove(skb->head + (4 + 4*1),
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skb->data, skb->len);
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skb->tail = skb->data + skb->len;
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}
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} else {
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struct sk_buff *skb2;
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skb2 = skb_copy_expand(skb, (4 + 4*1) , padlen, flags);
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dev_kfree_skb_any(skb);
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skb = skb2;
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if (!skb)
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return NULL;
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}
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// attach the packet count to the header
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packet_count = (u32 *) skb_push(skb, (4 + 4*1));
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packet_len = packet_count + 1;
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*packet_count = cpu_to_le32(1);
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*packet_len = cpu_to_le32(length);
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// add padding byte
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if ((skb->len % dev->maxpacket) == 0)
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skb_put(skb, 1);
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return skb;
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}
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static int genelink_bind(struct usbnet *dev, struct usb_interface *intf)
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{
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dev->hard_mtu = GL_RCV_BUF_SIZE;
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dev->net->hard_header_len += 4;
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dev->in = usb_rcvbulkpipe(dev->udev, dev->driver_info->in);
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dev->out = usb_sndbulkpipe(dev->udev, dev->driver_info->out);
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return 0;
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}
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static const struct driver_info genelink_info = {
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.description = "Genesys GeneLink",
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.flags = FLAG_FRAMING_GL | FLAG_NO_SETINT,
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.bind = genelink_bind,
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.rx_fixup = genelink_rx_fixup,
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.tx_fixup = genelink_tx_fixup,
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.in = 1, .out = 2,
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#ifdef GENELINK_ACK
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.check_connect =genelink_check_connect,
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#endif
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};
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static const struct usb_device_id products [] = {
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{
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USB_DEVICE(0x05e3, 0x0502), // GL620USB-A
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.driver_info = (unsigned long) &genelink_info,
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},
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/* NOT: USB_DEVICE(0x05e3, 0x0501), // GL620USB
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* that's half duplex, not currently supported
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*/
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{ }, // END
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};
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MODULE_DEVICE_TABLE(usb, products);
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static struct usb_driver gl620a_driver = {
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.name = "gl620a",
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.id_table = products,
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.probe = usbnet_probe,
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.disconnect = usbnet_disconnect,
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.suspend = usbnet_suspend,
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.resume = usbnet_resume,
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};
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static int __init usbnet_init(void)
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{
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return usb_register(&gl620a_driver);
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}
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module_init(usbnet_init);
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static void __exit usbnet_exit(void)
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{
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usb_deregister(&gl620a_driver);
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}
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module_exit(usbnet_exit);
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MODULE_AUTHOR("Jiun-Jie Huang");
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MODULE_DESCRIPTION("GL620-USB-A Host-to-Host Link cables");
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MODULE_LICENSE("GPL");
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