424 lines
12 KiB
C
424 lines
12 KiB
C
/*
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* WUSB Wire Adapter: WLP interface
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* Driver for the Linux Network stack.
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* FIXME: docs
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*
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* This implements a very simple network driver for the WLP USB
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* device that is associated to a UWB (Ultra Wide Band) host.
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*
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* This is seen as an interface of a composite device. Once the UWB
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* host has an association to another WLP capable device, the
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* networking interface (aka WLP) can start to send packets back and
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* forth.
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*
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* Limitations:
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*
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* - Hand cranked; can't ifup the interface until there is an association
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*
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* - BW allocation very simplistic [see i1480u_mas_set() and callees].
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*
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*
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* ROADMAP:
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*
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* ENTRY POINTS (driver model):
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*
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* i1480u_driver_{exit,init}(): initialization of the driver.
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*
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* i1480u_probe(): called by the driver code when a device
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* matching 'i1480u_id_table' is connected.
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*
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* This allocs a netdev instance, inits with
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* i1480u_add(), then registers_netdev().
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* i1480u_init()
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* i1480u_add()
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*
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* i1480u_disconnect(): device has been disconnected/module
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* is being removed.
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* i1480u_rm()
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*/
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#include <linux/if_arp.h>
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#include <linux/etherdevice.h>
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#include "i1480u-wlp.h"
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static inline
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void i1480u_init(struct i1480u *i1480u)
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{
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/* nothing so far... doesn't it suck? */
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spin_lock_init(&i1480u->lock);
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INIT_LIST_HEAD(&i1480u->tx_list);
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spin_lock_init(&i1480u->tx_list_lock);
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wlp_options_init(&i1480u->options);
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edc_init(&i1480u->tx_errors);
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edc_init(&i1480u->rx_errors);
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#ifdef i1480u_FLOW_CONTROL
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edc_init(&i1480u->notif_edc);
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#endif
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stats_init(&i1480u->lqe_stats);
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stats_init(&i1480u->rssi_stats);
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wlp_init(&i1480u->wlp);
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}
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/**
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* Fill WLP device information structure
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*
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* The structure will contain a few character arrays, each ending with a
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* null terminated string. Each string has to fit (excluding terminating
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* character) into a specified range obtained from the WLP substack.
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*
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* It is still not clear exactly how this device information should be
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* obtained. Until we find out we use the USB device descriptor as backup, some
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* information elements have intuitive mappings, other not.
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*/
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static
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void i1480u_fill_device_info(struct wlp *wlp, struct wlp_device_info *dev_info)
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{
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struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
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struct usb_device *usb_dev = i1480u->usb_dev;
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/* Treat device name and model name the same */
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if (usb_dev->descriptor.iProduct) {
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usb_string(usb_dev, usb_dev->descriptor.iProduct,
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dev_info->name, sizeof(dev_info->name));
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usb_string(usb_dev, usb_dev->descriptor.iProduct,
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dev_info->model_name, sizeof(dev_info->model_name));
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}
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if (usb_dev->descriptor.iManufacturer)
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usb_string(usb_dev, usb_dev->descriptor.iManufacturer,
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dev_info->manufacturer,
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sizeof(dev_info->manufacturer));
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scnprintf(dev_info->model_nr, sizeof(dev_info->model_nr), "%04x",
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__le16_to_cpu(usb_dev->descriptor.bcdDevice));
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if (usb_dev->descriptor.iSerialNumber)
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usb_string(usb_dev, usb_dev->descriptor.iSerialNumber,
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dev_info->serial, sizeof(dev_info->serial));
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/* FIXME: where should we obtain category? */
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dev_info->prim_dev_type.category = cpu_to_le16(WLP_DEV_CAT_OTHER);
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/* FIXME: Complete OUI and OUIsubdiv attributes */
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}
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#ifdef i1480u_FLOW_CONTROL
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/**
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* Callback for the notification endpoint
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*
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* This mostly controls the xon/xoff protocol. In case of hard error,
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* we stop the queue. If not, we always retry.
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*/
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static
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void i1480u_notif_cb(struct urb *urb, struct pt_regs *regs)
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{
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struct i1480u *i1480u = urb->context;
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struct usb_interface *usb_iface = i1480u->usb_iface;
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struct device *dev = &usb_iface->dev;
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int result;
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switch (urb->status) {
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case 0: /* Got valid data, do xon/xoff */
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switch (i1480u->notif_buffer[0]) {
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case 'N':
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dev_err(dev, "XOFF STOPPING queue at %lu\n", jiffies);
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netif_stop_queue(i1480u->net_dev);
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break;
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case 'A':
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dev_err(dev, "XON STARTING queue at %lu\n", jiffies);
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netif_start_queue(i1480u->net_dev);
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break;
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default:
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dev_err(dev, "NEP: unknown data 0x%02hhx\n",
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i1480u->notif_buffer[0]);
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}
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break;
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case -ECONNRESET: /* Controlled situation ... */
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case -ENOENT: /* we killed the URB... */
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dev_err(dev, "NEP: URB reset/noent %d\n", urb->status);
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goto error;
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case -ESHUTDOWN: /* going away! */
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dev_err(dev, "NEP: URB down %d\n", urb->status);
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goto error;
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default: /* Retry unless it gets ugly */
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if (edc_inc(&i1480u->notif_edc, EDC_MAX_ERRORS,
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EDC_ERROR_TIMEFRAME)) {
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dev_err(dev, "NEP: URB max acceptable errors "
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"exceeded; resetting device\n");
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goto error_reset;
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}
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dev_err(dev, "NEP: URB error %d\n", urb->status);
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break;
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}
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result = usb_submit_urb(urb, GFP_ATOMIC);
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if (result < 0) {
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dev_err(dev, "NEP: Can't resubmit URB: %d; resetting device\n",
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result);
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goto error_reset;
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}
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return;
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error_reset:
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wlp_reset_all(&i1480-wlp);
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error:
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netif_stop_queue(i1480u->net_dev);
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return;
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}
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#endif
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static const struct net_device_ops i1480u_netdev_ops = {
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.ndo_open = i1480u_open,
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.ndo_stop = i1480u_stop,
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.ndo_start_xmit = i1480u_hard_start_xmit,
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.ndo_tx_timeout = i1480u_tx_timeout,
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.ndo_set_config = i1480u_set_config,
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.ndo_change_mtu = i1480u_change_mtu,
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};
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static
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int i1480u_add(struct i1480u *i1480u, struct usb_interface *iface)
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{
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int result = -ENODEV;
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struct wlp *wlp = &i1480u->wlp;
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struct usb_device *usb_dev = interface_to_usbdev(iface);
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struct net_device *net_dev = i1480u->net_dev;
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struct uwb_rc *rc;
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struct uwb_dev *uwb_dev;
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#ifdef i1480u_FLOW_CONTROL
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struct usb_endpoint_descriptor *epd;
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#endif
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i1480u->usb_dev = usb_get_dev(usb_dev);
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i1480u->usb_iface = iface;
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rc = uwb_rc_get_by_grandpa(&i1480u->usb_dev->dev);
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if (rc == NULL) {
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dev_err(&iface->dev, "Cannot get associated UWB Radio "
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"Controller\n");
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goto out;
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}
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wlp->xmit_frame = i1480u_xmit_frame;
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wlp->fill_device_info = i1480u_fill_device_info;
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wlp->stop_queue = i1480u_stop_queue;
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wlp->start_queue = i1480u_start_queue;
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result = wlp_setup(wlp, rc, net_dev);
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if (result < 0) {
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dev_err(&iface->dev, "Cannot setup WLP\n");
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goto error_wlp_setup;
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}
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result = 0;
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ether_setup(net_dev); /* make it an etherdevice */
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uwb_dev = &rc->uwb_dev;
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/* FIXME: hookup address change notifications? */
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memcpy(net_dev->dev_addr, uwb_dev->mac_addr.data,
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sizeof(net_dev->dev_addr));
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net_dev->hard_header_len = sizeof(struct untd_hdr_cmp)
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+ sizeof(struct wlp_tx_hdr)
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+ WLP_DATA_HLEN
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+ ETH_HLEN;
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net_dev->mtu = 3500;
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net_dev->tx_queue_len = 20; /* FIXME: maybe use 1000? */
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/* net_dev->flags &= ~IFF_BROADCAST; FIXME: BUG in firmware */
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/* FIXME: multicast disabled */
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net_dev->flags &= ~IFF_MULTICAST;
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net_dev->features &= ~NETIF_F_SG;
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net_dev->features &= ~NETIF_F_FRAGLIST;
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/* All NETIF_F_*_CSUM disabled */
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net_dev->features |= NETIF_F_HIGHDMA;
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net_dev->watchdog_timeo = 5*HZ; /* FIXME: a better default? */
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net_dev->netdev_ops = &i1480u_netdev_ops;
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#ifdef i1480u_FLOW_CONTROL
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/* Notification endpoint setup (submitted when we open the device) */
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i1480u->notif_urb = usb_alloc_urb(0, GFP_KERNEL);
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if (i1480u->notif_urb == NULL) {
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dev_err(&iface->dev, "Unable to allocate notification URB\n");
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result = -ENOMEM;
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goto error_urb_alloc;
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}
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epd = &iface->cur_altsetting->endpoint[0].desc;
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usb_fill_int_urb(i1480u->notif_urb, usb_dev,
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usb_rcvintpipe(usb_dev, epd->bEndpointAddress),
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i1480u->notif_buffer, sizeof(i1480u->notif_buffer),
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i1480u_notif_cb, i1480u, epd->bInterval);
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#endif
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i1480u->tx_inflight.max = i1480u_TX_INFLIGHT_MAX;
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i1480u->tx_inflight.threshold = i1480u_TX_INFLIGHT_THRESHOLD;
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i1480u->tx_inflight.restart_ts = jiffies;
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usb_set_intfdata(iface, i1480u);
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return result;
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#ifdef i1480u_FLOW_CONTROL
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error_urb_alloc:
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#endif
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wlp_remove(wlp);
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error_wlp_setup:
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uwb_rc_put(rc);
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out:
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usb_put_dev(i1480u->usb_dev);
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return result;
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}
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static void i1480u_rm(struct i1480u *i1480u)
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{
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struct uwb_rc *rc = i1480u->wlp.rc;
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usb_set_intfdata(i1480u->usb_iface, NULL);
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#ifdef i1480u_FLOW_CONTROL
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usb_kill_urb(i1480u->notif_urb);
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usb_free_urb(i1480u->notif_urb);
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#endif
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wlp_remove(&i1480u->wlp);
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uwb_rc_put(rc);
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usb_put_dev(i1480u->usb_dev);
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}
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/** Just setup @net_dev's i1480u private data */
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static void i1480u_netdev_setup(struct net_device *net_dev)
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{
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struct i1480u *i1480u = netdev_priv(net_dev);
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/* Initialize @i1480u */
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memset(i1480u, 0, sizeof(*i1480u));
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i1480u_init(i1480u);
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}
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/**
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* Probe a i1480u interface and register it
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*
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* @iface: USB interface to link to
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* @id: USB class/subclass/protocol id
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* @returns: 0 if ok, < 0 errno code on error.
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*
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* Does basic housekeeping stuff and then allocs a netdev with space
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* for the i1480u data. Initializes, registers in i1480u, registers in
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* netdev, ready to go.
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*/
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static int i1480u_probe(struct usb_interface *iface,
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const struct usb_device_id *id)
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{
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int result;
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struct net_device *net_dev;
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struct device *dev = &iface->dev;
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struct i1480u *i1480u;
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/* Allocate instance [calls i1480u_netdev_setup() on it] */
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result = -ENOMEM;
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net_dev = alloc_netdev(sizeof(*i1480u), "wlp%d", i1480u_netdev_setup);
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if (net_dev == NULL) {
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dev_err(dev, "no memory for network device instance\n");
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goto error_alloc_netdev;
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}
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SET_NETDEV_DEV(net_dev, dev);
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i1480u = netdev_priv(net_dev);
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i1480u->net_dev = net_dev;
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result = i1480u_add(i1480u, iface); /* Now setup all the wlp stuff */
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if (result < 0) {
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dev_err(dev, "cannot add i1480u device: %d\n", result);
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goto error_i1480u_add;
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}
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result = register_netdev(net_dev); /* Okey dokey, bring it up */
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if (result < 0) {
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dev_err(dev, "cannot register network device: %d\n", result);
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goto error_register_netdev;
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}
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i1480u_sysfs_setup(i1480u);
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if (result < 0)
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goto error_sysfs_init;
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return 0;
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error_sysfs_init:
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unregister_netdev(net_dev);
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error_register_netdev:
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i1480u_rm(i1480u);
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error_i1480u_add:
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free_netdev(net_dev);
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error_alloc_netdev:
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return result;
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}
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/**
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* Disconect a i1480u from the system.
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*
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* i1480u_stop() has been called before, so al the rx and tx contexts
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* have been taken down already. Make sure the queue is stopped,
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* unregister netdev and i1480u, free and kill.
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*/
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static void i1480u_disconnect(struct usb_interface *iface)
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{
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struct i1480u *i1480u;
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struct net_device *net_dev;
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i1480u = usb_get_intfdata(iface);
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net_dev = i1480u->net_dev;
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netif_stop_queue(net_dev);
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#ifdef i1480u_FLOW_CONTROL
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usb_kill_urb(i1480u->notif_urb);
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#endif
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i1480u_sysfs_release(i1480u);
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unregister_netdev(net_dev);
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i1480u_rm(i1480u);
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free_netdev(net_dev);
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}
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static struct usb_device_id i1480u_id_table[] = {
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{
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.match_flags = USB_DEVICE_ID_MATCH_DEVICE \
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| USB_DEVICE_ID_MATCH_DEV_INFO \
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| USB_DEVICE_ID_MATCH_INT_INFO,
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.idVendor = 0x8086,
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.idProduct = 0x0c3b,
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.bDeviceClass = 0xef,
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.bDeviceSubClass = 0x02,
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.bDeviceProtocol = 0x02,
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.bInterfaceClass = 0xff,
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.bInterfaceSubClass = 0xff,
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.bInterfaceProtocol = 0xff,
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},
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{},
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};
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MODULE_DEVICE_TABLE(usb, i1480u_id_table);
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static struct usb_driver i1480u_driver = {
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.name = KBUILD_MODNAME,
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.probe = i1480u_probe,
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.disconnect = i1480u_disconnect,
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.id_table = i1480u_id_table,
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};
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static int __init i1480u_driver_init(void)
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{
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return usb_register(&i1480u_driver);
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}
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module_init(i1480u_driver_init);
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static void __exit i1480u_driver_exit(void)
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{
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usb_deregister(&i1480u_driver);
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}
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module_exit(i1480u_driver_exit);
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MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
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MODULE_DESCRIPTION("i1480 Wireless UWB Link WLP networking for USB");
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MODULE_LICENSE("GPL");
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