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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2002 Pavel Machek <pavel@ucw.cz>
* Copyright (C) 2002-2005 by David Brownell
*/
// #define DEBUG // error path messages, extra info
// #define VERBOSE // more; success messages
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/mii.h>
#include <linux/crc32.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <linux/usb/usbnet.h>
/*
* All known Zaurii lie about their standards conformance. At least
* the earliest SA-1100 models lie by saying they support CDC Ethernet.
* Some later models (especially PXA-25x and PXA-27x based ones) lie
* and say they support CDC MDLM (for access to cell phone modems).
*
* There are non-Zaurus products that use these same protocols too.
*
* The annoying thing is that at the same time Sharp was developing
* that annoying standards-breaking software, the Linux community had
* a simple "CDC Subset" working reliably on the same SA-1100 hardware.
* That is, the same functionality but not violating standards.
*
* The CDC Ethernet nonconformance points are troublesome to hosts
* with a true CDC Ethernet implementation:
* - Framing appends a CRC, which the spec says drivers "must not" do;
* - Transfers data in altsetting zero, instead of altsetting 1;
* - All these peripherals use the same ethernet address.
*
* The CDC MDLM nonconformance is less immediately troublesome, since all
* MDLM implementations are quasi-proprietary anyway.
*/
static struct sk_buff *
zaurus_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
{
int padlen;
struct sk_buff *skb2;
padlen = 2;
if (!skb_cloned(skb)) {
int tailroom = skb_tailroom(skb);
if ((padlen + 4) <= tailroom)
goto done;
}
skb2 = skb_copy_expand(skb, 0, 4 + padlen, flags);
dev_kfree_skb_any(skb);
skb = skb2;
if (skb) {
u32 fcs;
done:
fcs = crc32_le(~0, skb->data, skb->len);
fcs = ~fcs;
skb_put_u8(skb, fcs & 0xff);
skb_put_u8(skb, (fcs >> 8) & 0xff);
skb_put_u8(skb, (fcs >> 16) & 0xff);
skb_put_u8(skb, (fcs >> 24) & 0xff);
}
return skb;
}
static int zaurus_bind(struct usbnet *dev, struct usb_interface *intf)
{
/* Belcarra's funky framing has other options; mostly
* TRAILERS (!) with 4 bytes CRC, and maybe 2 pad bytes.
*/
dev->net->hard_header_len += 6;
dev->rx_urb_size = dev->net->hard_header_len + dev->net->mtu;
return usbnet_generic_cdc_bind(dev, intf);
}
/* PDA style devices are always connected if present */
static int always_connected (struct usbnet *dev)
{
return 0;
}
static const struct driver_info zaurus_sl5x00_info = {
.description = "Sharp Zaurus SL-5x00",
.flags = FLAG_POINTTOPOINT | FLAG_FRAMING_Z,
.check_connect = always_connected,
.bind = zaurus_bind,
.unbind = usbnet_cdc_unbind,
.tx_fixup = zaurus_tx_fixup,
};
#define ZAURUS_STRONGARM_INFO ((unsigned long)&zaurus_sl5x00_info)
static const struct driver_info zaurus_pxa_info = {
.description = "Sharp Zaurus, PXA-2xx based",
.flags = FLAG_POINTTOPOINT | FLAG_FRAMING_Z,
.check_connect = always_connected,
.bind = zaurus_bind,
.unbind = usbnet_cdc_unbind,
.tx_fixup = zaurus_tx_fixup,
};
#define ZAURUS_PXA_INFO ((unsigned long)&zaurus_pxa_info)
static const struct driver_info olympus_mxl_info = {
.description = "Olympus R1000",
.flags = FLAG_POINTTOPOINT | FLAG_FRAMING_Z,
.check_connect = always_connected,
.bind = zaurus_bind,
.unbind = usbnet_cdc_unbind,
.tx_fixup = zaurus_tx_fixup,
};
#define OLYMPUS_MXL_INFO ((unsigned long)&olympus_mxl_info)
/* Some more recent products using Lineo/Belcarra code will wrongly claim
* CDC MDLM conformance. They aren't conformant: data endpoints live
* in the control interface, there's no data interface, and it's not used
* to talk to a cell phone radio. But at least we can detect these two
* pseudo-classes, rather than growing this product list with entries for
* each new nonconformant product (sigh).
*/
static const u8 safe_guid[16] = {
0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
};
static const u8 blan_guid[16] = {
0x74, 0xf0, 0x3d, 0xbd, 0x1e, 0xc1, 0x44, 0x70,
0xa3, 0x67, 0x71, 0x34, 0xc9, 0xf5, 0x54, 0x37,
};
static int blan_mdlm_bind(struct usbnet *dev, struct usb_interface *intf)
{
u8 *buf = intf->cur_altsetting->extra;
int len = intf->cur_altsetting->extralen;
struct usb_cdc_mdlm_desc *desc = NULL;
struct usb_cdc_mdlm_detail_desc *detail = NULL;
while (len > 3) {
if (buf [1] != USB_DT_CS_INTERFACE)
goto next_desc;
/* use bDescriptorSubType, and just verify that we get a
* "BLAN" (or "SAFE") descriptor.
*/
switch (buf [2]) {
case USB_CDC_MDLM_TYPE:
if (desc) {
dev_dbg(&intf->dev, "extra MDLM\n");
goto bad_desc;
}
desc = (void *) buf;
if (desc->bLength != sizeof *desc) {
dev_dbg(&intf->dev, "MDLM len %u\n",
desc->bLength);
goto bad_desc;
}
/* expect bcdVersion 1.0, ignore */
if (memcmp(&desc->bGUID, blan_guid, 16) &&
memcmp(&desc->bGUID, safe_guid, 16)) {
/* hey, this one might _really_ be MDLM! */
dev_dbg(&intf->dev, "MDLM guid\n");
goto bad_desc;
}
break;
case USB_CDC_MDLM_DETAIL_TYPE:
if (detail) {
dev_dbg(&intf->dev, "extra MDLM detail\n");
goto bad_desc;
}
detail = (void *) buf;
switch (detail->bGuidDescriptorType) {
case 0: /* "SAFE" */
if (detail->bLength != (sizeof *detail + 2))
goto bad_detail;
break;
case 1: /* "BLAN" */
if (detail->bLength != (sizeof *detail + 3))
goto bad_detail;
break;
default:
goto bad_detail;
}
/* assuming we either noticed BLAN already, or will
* find it soon, there are some data bytes here:
* - bmNetworkCapabilities (unused)
* - bmDataCapabilities (bits, see below)
* - bPad (ignored, for PADAFTER -- BLAN-only)
* bits are:
* - 0x01 -- Zaurus framing (add CRC)
* - 0x02 -- PADBEFORE (CRC includes some padding)
* - 0x04 -- PADAFTER (some padding after CRC)
* - 0x08 -- "fermat" packet mangling (for hw bugs)
* the PADBEFORE appears not to matter; we interop
* with devices that use it and those that don't.
*/
if ((detail->bDetailData[1] & ~0x02) != 0x01) {
/* bmDataCapabilities == 0 would be fine too,
* but framing is minidriver-coupled for now.
*/
bad_detail:
dev_dbg(&intf->dev,
"bad MDLM detail, %d %d %d\n",
detail->bLength,
detail->bDetailData[0],
detail->bDetailData[2]);
goto bad_desc;
}
/* same extra framing as for non-BLAN mode */
dev->net->hard_header_len += 6;
dev->rx_urb_size = dev->net->hard_header_len
+ dev->net->mtu;
break;
}
next_desc:
len -= buf [0]; /* bLength */
buf += buf [0];
}
if (!desc || !detail) {
dev_dbg(&intf->dev, "missing cdc mdlm %s%sdescriptor\n",
desc ? "" : "func ",
detail ? "" : "detail ");
goto bad_desc;
}
/* There's probably a CDC Ethernet descriptor there, but we can't
* rely on the Ethernet address it provides since not all vendors
* bother to make it unique. Likewise there's no point in tracking
* of the CDC event notifications.
*/
return usbnet_get_endpoints(dev, intf);
bad_desc:
dev_info(&dev->udev->dev, "unsupported MDLM descriptors\n");
return -ENODEV;
}
static const struct driver_info bogus_mdlm_info = {
.description = "pseudo-MDLM (BLAN) device",
.flags = FLAG_POINTTOPOINT | FLAG_FRAMING_Z,
.check_connect = always_connected,
.tx_fixup = zaurus_tx_fixup,
.bind = blan_mdlm_bind,
};
static const struct usb_device_id products [] = {
#define ZAURUS_MASTER_INTERFACE \
.bInterfaceClass = USB_CLASS_COMM, \
.bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET, \
.bInterfaceProtocol = USB_CDC_PROTO_NONE
/* SA-1100 based Sharp Zaurus ("collie"), or compatible. */
{
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = 0x04DD,
.idProduct = 0x8004,
ZAURUS_MASTER_INTERFACE,
.driver_info = ZAURUS_STRONGARM_INFO,
},
/* PXA-2xx based models are also lying-about-cdc. If you add any
* more devices that claim to be CDC Ethernet, make sure they get
* added to the blacklist in cdc_ether too.
*
* NOTE: OpenZaurus versions with 2.6 kernels won't use these entries,
* unlike the older ones with 2.4 "embedix" kernels.
*/
{
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = 0x04DD,
.idProduct = 0x8005, /* A-300 */
ZAURUS_MASTER_INTERFACE,
.driver_info = ZAURUS_PXA_INFO,
}, {
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = 0x04DD,
.idProduct = 0x8006, /* B-500/SL-5600 */
ZAURUS_MASTER_INTERFACE,
.driver_info = ZAURUS_PXA_INFO,
}, {
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = 0x04DD,
.idProduct = 0x8007, /* C-700 */
ZAURUS_MASTER_INTERFACE,
.driver_info = ZAURUS_PXA_INFO,
}, {
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = 0x04DD,
.idProduct = 0x9031, /* C-750 C-760 */
ZAURUS_MASTER_INTERFACE,
.driver_info = ZAURUS_PXA_INFO,
}, {
/* C-750/C-760/C-860/SL-C3000 PDA in MDLM mode */
USB_DEVICE_AND_INTERFACE_INFO(0x04DD, 0x9031, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &bogus_mdlm_info,
}, {
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = 0x04DD,
.idProduct = 0x9032, /* SL-6000 */
ZAURUS_MASTER_INTERFACE,
.driver_info = ZAURUS_PXA_INFO,
}, {
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = 0x04DD,
/* reported with some C860 units */
.idProduct = 0x9050, /* C-860 */
ZAURUS_MASTER_INTERFACE,
.driver_info = ZAURUS_PXA_INFO,
},
{
/* Motorola Rokr E6 */
USB_DEVICE_AND_INTERFACE_INFO(0x22b8, 0x6027, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &bogus_mdlm_info,
}, {
/* Motorola MOTOMAGX phones */
USB_DEVICE_AND_INTERFACE_INFO(0x22b8, 0x6425, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &bogus_mdlm_info,
},
/* Olympus has some models with a Zaurus-compatible option.
* R-1000 uses a FreeScale i.MXL cpu (ARMv4T)
*/
{
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
| USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = 0x07B4,
.idProduct = 0x0F02, /* R-1000 */
ZAURUS_MASTER_INTERFACE,
.driver_info = OLYMPUS_MXL_INFO,
},
/* Logitech Harmony 900 - uses the pseudo-MDLM (BLAN) driver */
{
USB_DEVICE_AND_INTERFACE_INFO(0x046d, 0xc11f, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &bogus_mdlm_info,
},
{ }, // END
};
MODULE_DEVICE_TABLE(usb, products);
static struct usb_driver zaurus_driver = {
.name = "zaurus",
.id_table = products,
.probe = usbnet_probe,
.disconnect = usbnet_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.disable_hub_initiated_lpm = 1,
};
module_usb_driver(zaurus_driver);
MODULE_AUTHOR("Pavel Machek, David Brownell");
MODULE_DESCRIPTION("Sharp Zaurus PDA, and compatible products");
MODULE_LICENSE("GPL");
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