drivers/uwb/i1480/i1480u-wlp/lc.c

   1 /*
   2  * WUSB Wire Adapter: WLP interface
   3  * Driver for the Linux Network stack.
   4  *
   5  * Copyright (C) 2005-2006 Intel Corporation
   6  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version
  10  * 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  *
  22  *
  23  * FIXME: docs
  24  *
  25  * This implements a very simple network driver for the WLP USB
  26  * device that is associated to a UWB (Ultra Wide Band) host.
  27  *
  28  * This is seen as an interface of a composite device. Once the UWB
  29  * host has an association to another WLP capable device, the
  30  * networking interface (aka WLP) can start to send packets back and
  31  * forth.
  32  *
  33  * Limitations:
  34  *
  35  *  - Hand cranked; can't ifup the interface until there is an association
  36  *
  37  *  - BW allocation very simplistic [see i1480u_mas_set() and callees].
  38  *
  39  *
  40  * ROADMAP:
  41  *
  42  *   ENTRY POINTS (driver model):
  43  *
  44  *     i1480u_driver_{exit,init}(): initialization of the driver.
  45  *
  46  *     i1480u_probe(): called by the driver code when a device
  47  *                     matching 'i1480u_id_table' is connected.
  48  *
  49  *                     This allocs a netdev instance, inits with
  50  *                     i1480u_add(), then registers_netdev().
  51  *         i1480u_init()
  52  *         i1480u_add()
  53  *
  54  *     i1480u_disconnect(): device has been disconnected/module
  55  *                          is being removed.
  56  *         i1480u_rm()
  57  */
  58 #include <linux/if_arp.h>
  59 #include <linux/etherdevice.h>
  60
  61 #include "i1480u-wlp.h"
  62
  63
  64
  65 static inline
  66 void i1480u_init(struct i1480u *i1480u)
  67 {
  68         /* nothing so far... doesn't it suck? */
  69         spin_lock_init(&i1480u->lock);
  70         INIT_LIST_HEAD(&i1480u->tx_list);
  71         spin_lock_init(&i1480u->tx_list_lock);
  72         wlp_options_init(&i1480u->options);
  73         edc_init(&i1480u->tx_errors);
  74         edc_init(&i1480u->rx_errors);
  75 #ifdef i1480u_FLOW_CONTROL
  76         edc_init(&i1480u->notif_edc);
  77 #endif
  78         stats_init(&i1480u->lqe_stats);
  79         stats_init(&i1480u->rssi_stats);
  80         wlp_init(&i1480u->wlp);
  81 }
  82
  83 /**
  84  * Fill WLP device information structure
  85  *
  86  * The structure will contain a few character arrays, each ending with a
  87  * null terminated string. Each string has to fit (excluding terminating
  88  * character) into a specified range obtained from the WLP substack.
  89  *
  90  * It is still not clear exactly how this device information should be
  91  * obtained. Until we find out we use the USB device descriptor as backup, some
  92  * information elements have intuitive mappings, other not.
  93  */
  94 static
  95 void i1480u_fill_device_info(struct wlp *wlp, struct wlp_device_info *dev_info)
  96 {
  97         struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
  98         struct usb_device *usb_dev = i1480u->usb_dev;
  99         /* Treat device name and model name the same */
 100         if (usb_dev->descriptor.iProduct) {
 101                 usb_string(usb_dev, usb_dev->descriptor.iProduct,
 102                            dev_info->name, sizeof(dev_info->name));
 103                 usb_string(usb_dev, usb_dev->descriptor.iProduct,
 104                            dev_info->model_name, sizeof(dev_info->model_name));
 105         }
 106         if (usb_dev->descriptor.iManufacturer)
 107                 usb_string(usb_dev, usb_dev->descriptor.iManufacturer,
 108                            dev_info->manufacturer,
 109                            sizeof(dev_info->manufacturer));
 110         scnprintf(dev_info->model_nr, sizeof(dev_info->model_nr), "%04x",
 111                   __le16_to_cpu(usb_dev->descriptor.bcdDevice));
 112         if (usb_dev->descriptor.iSerialNumber)
 113                 usb_string(usb_dev, usb_dev->descriptor.iSerialNumber,
 114                            dev_info->serial, sizeof(dev_info->serial));
 115         /* FIXME: where should we obtain category? */
 116         dev_info->prim_dev_type.category = cpu_to_le16(WLP_DEV_CAT_OTHER);
 117         /* FIXME: Complete OUI and OUIsubdiv attributes */
 118 }
 119
 120 #ifdef i1480u_FLOW_CONTROL
 121 /**
 122  * Callback for the notification endpoint
 123  *
 124  * This mostly controls the xon/xoff protocol. In case of hard error,
 125  * we stop the queue. If not, we always retry.
 126  */
 127 static
 128 void i1480u_notif_cb(struct urb *urb, struct pt_regs *regs)
 129 {
 130         struct i1480u *i1480u = urb->context;
 131         struct usb_interface *usb_iface = i1480u->usb_iface;
 132         struct device *dev = &usb_iface->dev;
 133         int result;
 134
 135         switch (urb->status) {
 136         case 0:                         /* Got valid data, do xon/xoff */
 137                 switch (i1480u->notif_buffer[0]) {
 138                 case 'N':
 139                         dev_err(dev, "XOFF STOPPING queue at %lu\n", jiffies);
 140                         netif_stop_queue(i1480u->net_dev);
 141                         break;
 142                 case 'A':
 143                         dev_err(dev, "XON STARTING queue at %lu\n", jiffies);
 144                         netif_start_queue(i1480u->net_dev);
 145                         break;
 146                 default:
 147                         dev_err(dev, "NEP: unknown data 0x%02hhx\n",
 148                                 i1480u->notif_buffer[0]);
 149                 }
 150                 break;
 151         case -ECONNRESET:               /* Controlled situation ... */
 152         case -ENOENT:                   /* we killed the URB... */
 153                 dev_err(dev, "NEP: URB reset/noent %d\n", urb->status);
 154                 goto error;
 155         case -ESHUTDOWN:                /* going away! */
 156                 dev_err(dev, "NEP: URB down %d\n", urb->status);
 157                 goto error;
 158         default:                        /* Retry unless it gets ugly */
 159                 if (edc_inc(&i1480u->notif_edc, EDC_MAX_ERRORS,
 160                             EDC_ERROR_TIMEFRAME)) {
 161                         dev_err(dev, "NEP: URB max acceptable errors "
 162                                 "exceeded; resetting device\n");
 163                         goto error_reset;
 164                 }
 165                 dev_err(dev, "NEP: URB error %d\n", urb->status);
 166                 break;
 167         }
 168         result = usb_submit_urb(urb, GFP_ATOMIC);
 169         if (result < 0) {
 170                 dev_err(dev, "NEP: Can't resubmit URB: %d; resetting device\n",
 171                         result);
 172                 goto error_reset;
 173         }
 174         return;
 175
 176 error_reset:
 177         wlp_reset_all(&i1480-wlp);
 178 error:
 179         netif_stop_queue(i1480u->net_dev);
 180         return;
 181 }
 182 #endif
 183
 184 static const struct net_device_ops i1480u_netdev_ops = {
 185         .ndo_open       = i1480u_open,
 186         .ndo_stop       = i1480u_stop,
 187         .ndo_start_xmit = i1480u_hard_start_xmit,
 188         .ndo_tx_timeout = i1480u_tx_timeout,
 189         .ndo_set_config = i1480u_set_config,
 190         .ndo_change_mtu = i1480u_change_mtu,
 191 };
 192
 193 static
 194 int i1480u_add(struct i1480u *i1480u, struct usb_interface *iface)
 195 {
 196         int result = -ENODEV;
 197         struct wlp *wlp = &i1480u->wlp;
 198         struct usb_device *usb_dev = interface_to_usbdev(iface);
 199         struct net_device *net_dev = i1480u->net_dev;
 200         struct uwb_rc *rc;
 201         struct uwb_dev *uwb_dev;
 202 #ifdef i1480u_FLOW_CONTROL
 203         struct usb_endpoint_descriptor *epd;
 204 #endif
 205
 206         i1480u->usb_dev = usb_get_dev(usb_dev);
 207         i1480u->usb_iface = iface;
 208         rc = uwb_rc_get_by_grandpa(&i1480u->usb_dev->dev);
 209         if (rc == NULL) {
 210                 dev_err(&iface->dev, "Cannot get associated UWB Radio "
 211                         "Controller\n");
 212                 goto out;
 213         }
 214         wlp->xmit_frame = i1480u_xmit_frame;
 215         wlp->fill_device_info = i1480u_fill_device_info;
 216         wlp->stop_queue = i1480u_stop_queue;
 217         wlp->start_queue = i1480u_start_queue;
 218         result = wlp_setup(wlp, rc, net_dev);
 219         if (result < 0) {
 220                 dev_err(&iface->dev, "Cannot setup WLP\n");
 221                 goto error_wlp_setup;
 222         }
 223         result = 0;
 224         ether_setup(net_dev);                   /* make it an etherdevice */
 225         uwb_dev = &rc->uwb_dev;
 226         /* FIXME: hookup address change notifications? */
 227
 228         memcpy(net_dev->dev_addr, uwb_dev->mac_addr.data,
 229                sizeof(net_dev->dev_addr));
 230
 231         net_dev->hard_header_len = sizeof(struct untd_hdr_cmp)
 232                 + sizeof(struct wlp_tx_hdr)
 233                 + WLP_DATA_HLEN
 234                 + ETH_HLEN;
 235         net_dev->mtu = 3500;
 236         net_dev->tx_queue_len = 20;             /* FIXME: maybe use 1000? */
 237
 238 /*      net_dev->flags &= ~IFF_BROADCAST;       FIXME: BUG in firmware */
 239         /* FIXME: multicast disabled */
 240         net_dev->flags &= ~IFF_MULTICAST;
 241         net_dev->features &= ~NETIF_F_SG;
 242         net_dev->features &= ~NETIF_F_FRAGLIST;
 243         /* All NETIF_F_*_CSUM disabled */
 244         net_dev->features |= NETIF_F_HIGHDMA;
 245         net_dev->watchdog_timeo = 5*HZ;         /* FIXME: a better default? */
 246
 247         net_dev->netdev_ops = &i1480u_netdev_ops;
 248
 249 #ifdef i1480u_FLOW_CONTROL
 250         /* Notification endpoint setup (submitted when we open the device) */
 251         i1480u->notif_urb = usb_alloc_urb(0, GFP_KERNEL);
 252         if (i1480u->notif_urb == NULL) {
 253                 dev_err(&iface->dev, "Unable to allocate notification URB\n");
 254                 result = -ENOMEM;
 255                 goto error_urb_alloc;
 256         }
 257         epd = &iface->cur_altsetting->endpoint[0].desc;
 258         usb_fill_int_urb(i1480u->notif_urb, usb_dev,
 259                          usb_rcvintpipe(usb_dev, epd->bEndpointAddress),
 260                          i1480u->notif_buffer, sizeof(i1480u->notif_buffer),
 261                          i1480u_notif_cb, i1480u, epd->bInterval);
 262
 263 #endif
 264
 265         i1480u->tx_inflight.max = i1480u_TX_INFLIGHT_MAX;
 266         i1480u->tx_inflight.threshold = i1480u_TX_INFLIGHT_THRESHOLD;
 267         i1480u->tx_inflight.restart_ts = jiffies;
 268         usb_set_intfdata(iface, i1480u);
 269         return result;
 270
 271 #ifdef i1480u_FLOW_CONTROL
 272 error_urb_alloc:
 273 #endif
 274         wlp_remove(wlp);
 275 error_wlp_setup:
 276         uwb_rc_put(rc);
 277 out:
 278         usb_put_dev(i1480u->usb_dev);
 279         return result;
 280 }
 281
 282 static void i1480u_rm(struct i1480u *i1480u)
 283 {
 284         struct uwb_rc *rc = i1480u->wlp.rc;
 285         usb_set_intfdata(i1480u->usb_iface, NULL);
 286 #ifdef i1480u_FLOW_CONTROL
 287         usb_kill_urb(i1480u->notif_urb);
 288         usb_free_urb(i1480u->notif_urb);
 289 #endif
 290         wlp_remove(&i1480u->wlp);
 291         uwb_rc_put(rc);
 292         usb_put_dev(i1480u->usb_dev);
 293 }
 294
 295 /** Just setup @net_dev's i1480u private data */
 296 static void i1480u_netdev_setup(struct net_device *net_dev)
 297 {
 298         struct i1480u *i1480u = netdev_priv(net_dev);
 299         /* Initialize @i1480u */
 300         memset(i1480u, 0, sizeof(*i1480u));
 301         i1480u_init(i1480u);
 302 }
 303
 304 /**
 305  * Probe a i1480u interface and register it
 306  *
 307  * @iface:   USB interface to link to
 308  * @id:      USB class/subclass/protocol id
 309  * @returns: 0 if ok, < 0 errno code on error.
 310  *
 311  * Does basic housekeeping stuff and then allocs a netdev with space
 312  * for the i1480u  data. Initializes, registers in i1480u, registers in
 313  * netdev, ready to go.
 314  */
 315 static int i1480u_probe(struct usb_interface *iface,
 316                         const struct usb_device_id *id)
 317 {
 318         int result;
 319         struct net_device *net_dev;
 320         struct device *dev = &iface->dev;
 321         struct i1480u *i1480u;
 322
 323         /* Allocate instance [calls i1480u_netdev_setup() on it] */
 324         result = -ENOMEM;
 325         net_dev = alloc_netdev(sizeof(*i1480u), "wlp%d", i1480u_netdev_setup);
 326         if (net_dev == NULL) {
 327                 dev_err(dev, "no memory for network device instance\n");
 328                 goto error_alloc_netdev;
 329         }
 330         SET_NETDEV_DEV(net_dev, dev);
 331         i1480u = netdev_priv(net_dev);
 332         i1480u->net_dev = net_dev;
 333         result = i1480u_add(i1480u, iface);     /* Now setup all the wlp stuff */
 334         if (result < 0) {
 335                 dev_err(dev, "cannot add i1480u device: %d\n", result);
 336                 goto error_i1480u_add;
 337         }
 338         result = register_netdev(net_dev);      /* Okey dokey, bring it up */
 339         if (result < 0) {
 340                 dev_err(dev, "cannot register network device: %d\n", result);
 341                 goto error_register_netdev;
 342         }
 343         i1480u_sysfs_setup(i1480u);
 344         if (result < 0)
 345                 goto error_sysfs_init;
 346         return 0;
 347
 348 error_sysfs_init:
 349         unregister_netdev(net_dev);
 350 error_register_netdev:
 351         i1480u_rm(i1480u);
 352 error_i1480u_add:
 353         free_netdev(net_dev);
 354 error_alloc_netdev:
 355         return result;
 356 }
 357
 358
 359 /**
 360  * Disconect a i1480u from the system.
 361  *
 362  * i1480u_stop() has been called before, so al the rx and tx contexts
 363  * have been taken down already. Make sure the queue is stopped,
 364  * unregister netdev and i1480u, free and kill.
 365  */
 366 static void i1480u_disconnect(struct usb_interface *iface)
 367 {
 368         struct i1480u *i1480u;
 369         struct net_device *net_dev;
 370
 371         i1480u = usb_get_intfdata(iface);
 372         net_dev = i1480u->net_dev;
 373         netif_stop_queue(net_dev);
 374 #ifdef i1480u_FLOW_CONTROL
 375         usb_kill_urb(i1480u->notif_urb);
 376 #endif
 377         i1480u_sysfs_release(i1480u);
 378         unregister_netdev(net_dev);
 379         i1480u_rm(i1480u);
 380         free_netdev(net_dev);
 381 }
 382
 383 static struct usb_device_id i1480u_id_table[] = {
 384         {
 385                 .match_flags = USB_DEVICE_ID_MATCH_DEVICE \
 386                                 |  USB_DEVICE_ID_MATCH_DEV_INFO \
 387                                 |  USB_DEVICE_ID_MATCH_INT_INFO,
 388                 .idVendor = 0x8086,
 389                 .idProduct = 0x0c3b,
 390                 .bDeviceClass = 0xef,
 391                 .bDeviceSubClass = 0x02,
 392                 .bDeviceProtocol = 0x02,
 393                 .bInterfaceClass = 0xff,
 394                 .bInterfaceSubClass = 0xff,
 395                 .bInterfaceProtocol = 0xff,
 396         },
 397         {},
 398 };
 399 MODULE_DEVICE_TABLE(usb, i1480u_id_table);
 400
 401 static struct usb_driver i1480u_driver = {
 402         .name =         KBUILD_MODNAME,
 403         .probe =        i1480u_probe,
 404         .disconnect =   i1480u_disconnect,
 405         .id_table =     i1480u_id_table,
 406 };
 407
 408 static int __init i1480u_driver_init(void)
 409 {
 410         return usb_register(&i1480u_driver);
 411 }
 412 module_init(i1480u_driver_init);
 413
 414
 415 static void __exit i1480u_driver_exit(void)
 416 {
 417         usb_deregister(&i1480u_driver);
 418 }
 419 module_exit(i1480u_driver_exit);
 420
 421 MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
 422 MODULE_DESCRIPTION("i1480 Wireless UWB Link WLP networking for USB");
 423 MODULE_LICENSE("GPL");