drivers/net/usb/zaurus.c

   1 /*
   2  * Copyright (C) 2002 Pavel Machek <pavel@ucw.cz>
   3  * Copyright (C) 2002-2005 by David Brownell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 // #define      DEBUG                   // error path messages, extra info
  21 // #define      VERBOSE                 // more; success messages
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/workqueue.h>
  28 #include <linux/mii.h>
  29 #include <linux/crc32.h>
  30 #include <linux/usb.h>
  31 #include <linux/usb/cdc.h>
  32
  33 #include "usbnet.h"
  34
  35
  36 /*
  37  * All known Zaurii lie about their standards conformance.  At least
  38  * the earliest SA-1100 models lie by saying they support CDC Ethernet.
  39  * Some later models (especially PXA-25x and PXA-27x based ones) lie
  40  * and say they support CDC MDLM (for access to cell phone modems).
  41  *
  42  * There are non-Zaurus products that use these same protocols too.
  43  *
  44  * The annoying thing is that at the same time Sharp was developing
  45  * that annoying standards-breaking software, the Linux community had
  46  * a simple "CDC Subset" working reliably on the same SA-1100 hardware.
  47  * That is, the same functionality but not violating standards.
  48  *
  49  * The CDC Ethernet nonconformance points are troublesome to hosts
  50  * with a true CDC Ethernet implementation:
  51  *   - Framing appends a CRC, which the spec says drivers "must not" do;
  52  *   - Transfers data in altsetting zero, instead of altsetting 1;
  53  *   - All these peripherals use the same ethernet address.
  54  *
  55  * The CDC MDLM nonconformance is less immediately troublesome, since all
  56  * MDLM implementations are quasi-proprietary anyway.
  57  */
  58
  59 static struct sk_buff *
  60 zaurus_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
  61 {
  62         int                     padlen;
  63         struct sk_buff          *skb2;
  64
  65         padlen = 2;
  66         if (!skb_cloned(skb)) {
  67                 int     tailroom = skb_tailroom(skb);
  68                 if ((padlen + 4) <= tailroom)
  69                         goto done;
  70         }
  71         skb2 = skb_copy_expand(skb, 0, 4 + padlen, flags);
  72         dev_kfree_skb_any(skb);
  73         skb = skb2;
  74         if (skb) {
  75                 u32             fcs;
  76 done:
  77                 fcs = crc32_le(~0, skb->data, skb->len);
  78                 fcs = ~fcs;
  79
  80                 *skb_put (skb, 1) = fcs       & 0xff;
  81                 *skb_put (skb, 1) = (fcs>> 8) & 0xff;
  82                 *skb_put (skb, 1) = (fcs>>16) & 0xff;
  83                 *skb_put (skb, 1) = (fcs>>24) & 0xff;
  84         }
  85         return skb;
  86 }
  87
  88 static int zaurus_bind(struct usbnet *dev, struct usb_interface *intf)
  89 {
  90         /* Belcarra's funky framing has other options; mostly
  91          * TRAILERS (!) with 4 bytes CRC, and maybe 2 pad bytes.
  92          */
  93         dev->net->hard_header_len += 6;
  94         dev->rx_urb_size = dev->net->hard_header_len + dev->net->mtu;
  95         return usbnet_generic_cdc_bind(dev, intf);
  96 }
  97
  98 /* PDA style devices are always connected if present */
  99 static int always_connected (struct usbnet *dev)
 100 {
 101         return 0;
 102 }
 103
 104 static const struct driver_info zaurus_sl5x00_info = {
 105         .description =  "Sharp Zaurus SL-5x00",
 106         .flags =        FLAG_FRAMING_Z,
 107         .check_connect = always_connected,
 108         .bind =         zaurus_bind,
 109         .unbind =       usbnet_cdc_unbind,
 110         .tx_fixup =     zaurus_tx_fixup,
 111 };
 112 #define ZAURUS_STRONGARM_INFO   ((unsigned long)&zaurus_sl5x00_info)
 113
 114 static const struct driver_info zaurus_pxa_info = {
 115         .description =  "Sharp Zaurus, PXA-2xx based",
 116         .flags =        FLAG_FRAMING_Z,
 117         .check_connect = always_connected,
 118         .bind =         zaurus_bind,
 119         .unbind =       usbnet_cdc_unbind,
 120         .tx_fixup =     zaurus_tx_fixup,
 121 };
 122 #define ZAURUS_PXA_INFO         ((unsigned long)&zaurus_pxa_info)
 123
 124 static const struct driver_info olympus_mxl_info = {
 125         .description =  "Olympus R1000",
 126         .flags =        FLAG_FRAMING_Z,
 127         .check_connect = always_connected,
 128         .bind =         zaurus_bind,
 129         .unbind =       usbnet_cdc_unbind,
 130         .tx_fixup =     zaurus_tx_fixup,
 131 };
 132 #define OLYMPUS_MXL_INFO        ((unsigned long)&olympus_mxl_info)
 133
 134
 135 /* Some more recent products using Lineo/Belcarra code will wrongly claim
 136  * CDC MDLM conformance.  They aren't conformant:  data endpoints live
 137  * in the control interface, there's no data interface, and it's not used
 138  * to talk to a cell phone radio.  But at least we can detect these two
 139  * pseudo-classes, rather than growing this product list with entries for
 140  * each new nonconformant product (sigh).
 141  */
 142 static const u8 safe_guid[16] = {
 143         0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
 144         0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
 145 };
 146 static const u8 blan_guid[16] = {
 147         0x74, 0xf0, 0x3d, 0xbd, 0x1e, 0xc1, 0x44, 0x70,
 148         0xa3, 0x67, 0x71, 0x34, 0xc9, 0xf5, 0x54, 0x37,
 149 };
 150
 151 static int blan_mdlm_bind(struct usbnet *dev, struct usb_interface *intf)
 152 {
 153         u8                              *buf = intf->cur_altsetting->extra;
 154         int                             len = intf->cur_altsetting->extralen;
 155         struct usb_cdc_mdlm_desc        *desc = NULL;
 156         struct usb_cdc_mdlm_detail_desc *detail = NULL;
 157
 158         while (len > 3) {
 159                 if (buf [1] != USB_DT_CS_INTERFACE)
 160                         goto next_desc;
 161
 162                 /* use bDescriptorSubType, and just verify that we get a
 163                  * "BLAN" (or "SAFE") descriptor.
 164                  */
 165                 switch (buf [2]) {
 166                 case USB_CDC_MDLM_TYPE:
 167                         if (desc) {
 168                                 dev_dbg(&intf->dev, "extra MDLM\n");
 169                                 goto bad_desc;
 170                         }
 171                         desc = (void *) buf;
 172                         if (desc->bLength != sizeof *desc) {
 173                                 dev_dbg(&intf->dev, "MDLM len %u\n",
 174                                         desc->bLength);
 175                                 goto bad_desc;
 176                         }
 177                         /* expect bcdVersion 1.0, ignore */
 178                         if (memcmp(&desc->bGUID, blan_guid, 16)
 179                                     && memcmp(&desc->bGUID, safe_guid, 16) ) {
 180                                 /* hey, this one might _really_ be MDLM! */
 181                                 dev_dbg(&intf->dev, "MDLM guid\n");
 182                                 goto bad_desc;
 183                         }
 184                         break;
 185                 case USB_CDC_MDLM_DETAIL_TYPE:
 186                         if (detail) {
 187                                 dev_dbg(&intf->dev, "extra MDLM detail\n");
 188                                 goto bad_desc;
 189                         }
 190                         detail = (void *) buf;
 191                         switch (detail->bGuidDescriptorType) {
 192                         case 0:                 /* "SAFE" */
 193                                 if (detail->bLength != (sizeof *detail + 2))
 194                                         goto bad_detail;
 195                                 break;
 196                         case 1:                 /* "BLAN" */
 197                                 if (detail->bLength != (sizeof *detail + 3))
 198                                         goto bad_detail;
 199                                 break;
 200                         default:
 201                                 goto bad_detail;
 202                         }
 203
 204                         /* assuming we either noticed BLAN already, or will
 205                          * find it soon, there are some data bytes here:
 206                          *  - bmNetworkCapabilities (unused)
 207                          *  - bmDataCapabilities (bits, see below)
 208                          *  - bPad (ignored, for PADAFTER -- BLAN-only)
 209                          * bits are:
 210                          *  - 0x01 -- Zaurus framing (add CRC)
 211                          *  - 0x02 -- PADBEFORE (CRC includes some padding)
 212                          *  - 0x04 -- PADAFTER (some padding after CRC)
 213                          *  - 0x08 -- "fermat" packet mangling (for hw bugs)
 214                          * the PADBEFORE appears not to matter; we interop
 215                          * with devices that use it and those that don't.
 216                          */
 217                         if ((detail->bDetailData[1] & ~0x02) != 0x01) {
 218                                 /* bmDataCapabilities == 0 would be fine too,
 219                                  * but framing is minidriver-coupled for now.
 220                                  */
 221 bad_detail:
 222                                 dev_dbg(&intf->dev,
 223                                                 "bad MDLM detail, %d %d %d\n",
 224                                                 detail->bLength,
 225                                                 detail->bDetailData[0],
 226                                                 detail->bDetailData[2]);
 227                                 goto bad_desc;
 228                         }
 229
 230                         /* same extra framing as for non-BLAN mode */
 231                         dev->net->hard_header_len += 6;
 232                         dev->rx_urb_size = dev->net->hard_header_len
 233                                         + dev->net->mtu;
 234                         break;
 235                 }
 236 next_desc:
 237                 len -= buf [0]; /* bLength */
 238                 buf += buf [0];
 239         }
 240
 241         if (!desc || !detail) {
 242                 dev_dbg(&intf->dev, "missing cdc mdlm %s%sdescriptor\n",
 243                         desc ? "" : "func ",
 244                         detail ? "" : "detail ");
 245                 goto bad_desc;
 246         }
 247
 248         /* There's probably a CDC Ethernet descriptor there, but we can't
 249          * rely on the Ethernet address it provides since not all vendors
 250          * bother to make it unique.  Likewise there's no point in tracking
 251          * of the CDC event notifications.
 252          */
 253         return usbnet_get_endpoints(dev, intf);
 254
 255 bad_desc:
 256         dev_info(&dev->udev->dev, "unsupported MDLM descriptors\n");
 257         return -ENODEV;
 258 }
 259
 260 static const struct driver_info bogus_mdlm_info = {
 261         .description =  "pseudo-MDLM (BLAN) device",
 262         .flags =        FLAG_FRAMING_Z,
 263         .check_connect = always_connected,
 264         .tx_fixup =     zaurus_tx_fixup,
 265         .bind =         blan_mdlm_bind,
 266 };
 267
 268 static const struct usb_device_id       products [] = {
 269 #define ZAURUS_MASTER_INTERFACE \
 270         .bInterfaceClass        = USB_CLASS_COMM, \
 271         .bInterfaceSubClass     = USB_CDC_SUBCLASS_ETHERNET, \
 272         .bInterfaceProtocol     = USB_CDC_PROTO_NONE
 273
 274 /* SA-1100 based Sharp Zaurus ("collie"), or compatible. */
 275 {
 276         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 277                           | USB_DEVICE_ID_MATCH_DEVICE,
 278         .idVendor               = 0x04DD,
 279         .idProduct              = 0x8004,
 280         ZAURUS_MASTER_INTERFACE,
 281         .driver_info = ZAURUS_STRONGARM_INFO,
 282 },
 283
 284 /* PXA-2xx based models are also lying-about-cdc.  If you add any
 285  * more devices that claim to be CDC Ethernet, make sure they get
 286  * added to the blacklist in cdc_ether too.
 287  *
 288  * NOTE:  OpenZaurus versions with 2.6 kernels won't use these entries,
 289  * unlike the older ones with 2.4 "embedix" kernels.
 290  */
 291 {
 292         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 293                           | USB_DEVICE_ID_MATCH_DEVICE,
 294         .idVendor               = 0x04DD,
 295         .idProduct              = 0x8005,       /* A-300 */
 296         ZAURUS_MASTER_INTERFACE,
 297         .driver_info = ZAURUS_PXA_INFO,
 298 }, {
 299         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 300                           | USB_DEVICE_ID_MATCH_DEVICE,
 301         .idVendor               = 0x04DD,
 302         .idProduct              = 0x8006,       /* B-500/SL-5600 */
 303         ZAURUS_MASTER_INTERFACE,
 304         .driver_info = ZAURUS_PXA_INFO,
 305 }, {
 306         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 307                   | USB_DEVICE_ID_MATCH_DEVICE,
 308         .idVendor               = 0x04DD,
 309         .idProduct              = 0x8007,       /* C-700 */
 310         ZAURUS_MASTER_INTERFACE,
 311         .driver_info = ZAURUS_PXA_INFO,
 312 }, {
 313         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 314                  | USB_DEVICE_ID_MATCH_DEVICE,
 315         .idVendor               = 0x04DD,
 316         .idProduct              = 0x9031,       /* C-750 C-760 */
 317         ZAURUS_MASTER_INTERFACE,
 318         .driver_info = ZAURUS_PXA_INFO,
 319 }, {
 320         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 321                  | USB_DEVICE_ID_MATCH_DEVICE,
 322         .idVendor               = 0x04DD,
 323         .idProduct              = 0x9032,       /* SL-6000 */
 324         ZAURUS_MASTER_INTERFACE,
 325         .driver_info = ZAURUS_PXA_INFO,
 326 }, {
 327         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 328                  | USB_DEVICE_ID_MATCH_DEVICE,
 329         .idVendor               = 0x04DD,
 330         /* reported with some C860 units */
 331         .idProduct              = 0x9050,       /* C-860 */
 332         ZAURUS_MASTER_INTERFACE,
 333         .driver_info = ZAURUS_PXA_INFO,
 334 },
 335
 336
 337 /* At least some of the newest PXA units have very different lies about
 338  * their standards support:  they claim to be cell phones offering
 339  * direct access to their radios!  (No, they don't conform to CDC MDLM.)
 340  */
 341 {
 342         USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MDLM,
 343                         USB_CDC_PROTO_NONE),
 344         .driver_info = (unsigned long) &bogus_mdlm_info,
 345 },
 346
 347 /* Olympus has some models with a Zaurus-compatible option.
 348  * R-1000 uses a FreeScale i.MXL cpu (ARMv4T)
 349  */
 350 {
 351         .match_flags    =   USB_DEVICE_ID_MATCH_INT_INFO
 352                  | USB_DEVICE_ID_MATCH_DEVICE,
 353         .idVendor               = 0x07B4,
 354         .idProduct              = 0x0F02,       /* R-1000 */
 355         ZAURUS_MASTER_INTERFACE,
 356         .driver_info = OLYMPUS_MXL_INFO,
 357 },
 358         { },            // END
 359 };
 360 MODULE_DEVICE_TABLE(usb, products);
 361
 362 static struct usb_driver zaurus_driver = {
 363         .name =         "zaurus",
 364         .id_table =     products,
 365         .probe =        usbnet_probe,
 366         .disconnect =   usbnet_disconnect,
 367         .suspend =      usbnet_suspend,
 368         .resume =       usbnet_resume,
 369 };
 370
 371 static int __init zaurus_init(void)
 372 {
 373         return usb_register(&zaurus_driver);
 374 }
 375 module_init(zaurus_init);
 376
 377 static void __exit zaurus_exit(void)
 378 {
 379         usb_deregister(&zaurus_driver);
 380 }
 381 module_exit(zaurus_exit);
 382
 383 MODULE_AUTHOR("Pavel Machek, David Brownell");
 384 MODULE_DESCRIPTION("Sharp Zaurus PDA, and compatible products");
 385 MODULE_LICENSE("GPL");