introduce cx82310_eth: Conexant CX82310-based ADSL router USB ethernet driver (cc28a20e) · Commits · 戴 / test

drivers/net/usb/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -358,6 +358,14 @@ config USB_NET_ZAURUS
		really need this non-conformant variant of CDC Ethernet (or in
		some cases CDC MDLM) protocol, not "g_ether".

		config USB_NET_CX82310_ETH
		tristate "Conexant CX82310 USB ethernet port"
		depends on USB_USBNET
		help
		Choose this option if you're using a Conexant CX82310-based ADSL
		router with USB ethernet port. This driver is for routers only,
		it will not work with ADSL modems (use cxacru driver instead).

		config USB_HSO
		tristate "Option USB High Speed Mobile Devices"
		depends on USB && RFKILL

drivers/net/usb/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -25,4 +25,5 @@ obj-$(CONFIG_USB_NET_INT51X1) += int51x1.o
		obj-$(CONFIG_USB_CDC_PHONET) += cdc-phonet.o
		obj-$(CONFIG_USB_IPHETH) += ipheth.o
		obj-$(CONFIG_USB_SIERRA_NET) += sierra_net.o
		obj-$(CONFIG_USB_NET_CX82310_ETH) += cx82310_eth.o

drivers/net/usb/cx82310_eth.c

0 → 100644

+354 −0

Original line number	Diff line number	Diff line
		/*
		* Driver for USB ethernet port of Conexant CX82310-based ADSL routers
		* Copyright (C) 2010 by Ondrej Zary
		* some parts inspired by the cxacru driver
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/netdevice.h>
		#include <linux/etherdevice.h>
		#include <linux/ethtool.h>
		#include <linux/workqueue.h>
		#include <linux/mii.h>
		#include <linux/usb.h>
		#include <linux/usb/usbnet.h>

		enum cx82310_cmd {
		CMD_START = 0x84, /* no effect? */
		CMD_STOP = 0x85, /* no effect? */
		CMD_GET_STATUS = 0x90, /* returns nothing? */
		CMD_GET_MAC_ADDR = 0x91, /* read MAC address */
		CMD_GET_LINK_STATUS = 0x92, /* not useful, link is always up */
		CMD_ETHERNET_MODE = 0x99, /* unknown, needed during init */
		};

		enum cx82310_status {
		STATUS_UNDEFINED,
		STATUS_SUCCESS,
		STATUS_ERROR,
		STATUS_UNSUPPORTED,
		STATUS_UNIMPLEMENTED,
		STATUS_PARAMETER_ERROR,
		STATUS_DBG_LOOPBACK,
		};

		#define CMD_PACKET_SIZE 64
		/* first command after power on can take around 8 seconds */
		#define CMD_TIMEOUT 15000
		#define CMD_REPLY_RETRY 5

		#define CX82310_MTU 1514
		#define CMD_EP 0x01

		/*
		* execute control command
		* - optionally send some data (command parameters)
		* - optionally wait for the reply
		* - optionally read some data from the reply
		*/
		static int cx82310_cmd(struct usbnet *dev, enum cx82310_cmd cmd, bool reply,
		u8 wdata, int wlen, u8 rdata, int rlen)
		{
		int actual_len, retries, ret;
		struct usb_device *udev = dev->udev;
		u8 *buf = kzalloc(CMD_PACKET_SIZE, GFP_KERNEL);

		if (!buf)
		return -ENOMEM;

		/* create command packet */
		buf[0] = cmd;
		if (wdata)
		memcpy(buf + 4, wdata, min_t(int, wlen, CMD_PACKET_SIZE - 4));

		/* send command packet */
		ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, CMD_EP), buf,
		CMD_PACKET_SIZE, &actual_len, CMD_TIMEOUT);
		if (ret < 0) {
		dev_err(&dev->udev->dev, "send command %#x: error %d\n",
		cmd, ret);
		goto end;
		}

		if (reply) {
		/* wait for reply, retry if it's empty */
		for (retries = 0; retries < CMD_REPLY_RETRY; retries++) {
		ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, CMD_EP),
		buf, CMD_PACKET_SIZE, &actual_len,
		CMD_TIMEOUT);
		if (ret < 0) {
		dev_err(&dev->udev->dev,
		"reply receive error %d\n", ret);
		goto end;
		}
		if (actual_len > 0)
		break;
		}
		if (actual_len == 0) {
		dev_err(&dev->udev->dev, "no reply to command %#x\n",
		cmd);
		ret = -EIO;
		goto end;
		}
		if (buf[0] != cmd) {
		dev_err(&dev->udev->dev,
		"got reply to command %#x, expected: %#x\n",
		buf[0], cmd);
		ret = -EIO;
		goto end;
		}
		if (buf[1] != STATUS_SUCCESS) {
		dev_err(&dev->udev->dev, "command %#x failed: %#x\n",
		cmd, buf[1]);
		ret = -EIO;
		goto end;
		}
		if (rdata)
		memcpy(rdata, buf + 4,
		min_t(int, rlen, CMD_PACKET_SIZE - 4));
		}
		end:
		kfree(buf);
		return ret;
		}

		#define partial_len data[0] /* length of partial packet data */
		#define partial_rem data[1] /* remaining (missing) data length */
		#define partial_data data[2] /* partial packet data */

		static int cx82310_bind(struct usbnet dev, struct usb_interface intf)
		{
		int ret;
		char buf[15];
		struct usb_device *udev = dev->udev;

		/* avoid ADSL modems - continue only if iProduct is "USB NET CARD" */
		if (udev->descriptor.iProduct &&
		usb_string(udev, udev->descriptor.iProduct, buf, sizeof(buf)) &&
		strcmp(buf, "USB NET CARD")) {
		dev_err(&udev->dev,
		"probably an ADSL modem, use cxacru driver instead\n");
		return -ENODEV;
		}

		ret = usbnet_get_endpoints(dev, intf);
		if (ret)
		return ret;

		/*
		* this must not include ethernet header as the device can send partial
		* packets with no header (URB is at least 2 bytes long, so 2 is OK)
		*/
		dev->net->hard_header_len = 2;
		/* we can send at most 1514 bytes of data (+ 2-byte header) per URB */
		dev->hard_mtu = CX82310_MTU + dev->net->hard_header_len;
		/* we can receive URBs up to 4KB from the device */
		dev->rx_urb_size = 4096;

		dev->partial_data = (unsigned long) kmalloc(dev->hard_mtu, GFP_KERNEL);
		if (!dev->partial_data)
		return -ENOMEM;

		/* enable ethernet mode (?) */
		ret = cx82310_cmd(dev, CMD_ETHERNET_MODE, true, "\x01", 1, NULL, 0);
		if (ret) {
		dev_err(&udev->dev, "unable to enable ethernet mode: %d\n",
		ret);
		goto err;
		}

		/* get the MAC address */
		ret = cx82310_cmd(dev, CMD_GET_MAC_ADDR, true, NULL, 0,
		dev->net->dev_addr, ETH_ALEN);
		if (ret) {
		dev_err(&udev->dev, "unable to read MAC address: %d\n", ret);
		goto err;
		}

		/* start (does not seem to have any effect?) */
		ret = cx82310_cmd(dev, CMD_START, false, NULL, 0, NULL, 0);
		if (ret)
		goto err;

		return 0;
		err:
		kfree((void *)dev->partial_data);
		return ret;
		}

		static void cx82310_unbind(struct usbnet dev, struct usb_interface intf)
		{
		kfree((void *)dev->partial_data);
		}

		/*
		* RX is NOT easy - we can receive multiple packets per skb, each having 2-byte
		* packet length at the beginning.
		* The last packet might be incomplete (when it crosses the 4KB URB size),
		* continuing in the next skb (without any headers).
		* If a packet has odd length, there is one extra byte at the end (before next
		* packet or at the end of the URB).
		*/
		static int cx82310_rx_fixup(struct usbnet dev, struct sk_buff skb)
		{
		int len;
		struct sk_buff *skb2;

		/*
		* If the last skb ended with an incomplete packet, this skb contains
		* end of that packet at the beginning.
		*/
		if (dev->partial_rem) {
		len = dev->partial_len + dev->partial_rem;
		skb2 = alloc_skb(len, GFP_ATOMIC);
		if (!skb2)
		return 0;
		skb_put(skb2, len);
		memcpy(skb2->data, (void *)dev->partial_data,
		dev->partial_len);
		memcpy(skb2->data + dev->partial_len, skb->data,
		dev->partial_rem);
		usbnet_skb_return(dev, skb2);
		skb_pull(skb, (dev->partial_rem + 1) & ~1);
		dev->partial_rem = 0;
		if (skb->len < 2)
		return 1;
		}

		if (skb->len < 2) {
		dev_err(&dev->udev->dev, "RX frame too short: %d B\n",
		skb->len);
		return 0;
		}

		/* a skb can contain multiple packets */
		while (skb->len > 1) {
		/* first two bytes are packet length */
		len = skb->data[0] \| (skb->data[1] << 8);
		skb_pull(skb, 2);

		/* if last packet in the skb, let usbnet to process it */
		if (len == skb->len \|\| len + 1 == skb->len) {
		skb_trim(skb, len);
		break;
		}

		if (len > CX82310_MTU) {
		dev_err(&dev->udev->dev, "RX packet too long: %d B\n",
		len);
		return 0;
		}

		/* incomplete packet, save it for the next skb */
		if (len > skb->len) {
		dev->partial_len = skb->len;
		dev->partial_rem = len - skb->len;
		memcpy((void *)dev->partial_data, skb->data,
		dev->partial_len);
		skb_pull(skb, skb->len);
		break;
		}

		skb2 = alloc_skb(len, GFP_ATOMIC);
		if (!skb2)
		return 0;
		skb_put(skb2, len);
		memcpy(skb2->data, skb->data, len);
		/* process the packet */
		usbnet_skb_return(dev, skb2);

		skb_pull(skb, (len + 1) & ~1);
		}

		/* let usbnet process the last packet */
		return 1;
		}

		/* TX is easy, just add 2 bytes of length at the beginning */
		static struct sk_buff cx82310_tx_fixup(struct usbnet dev, struct sk_buff *skb,
		gfp_t flags)
		{
		int len = skb->len;

		if (skb_headroom(skb) < 2) {
		struct sk_buff *skb2 = skb_copy_expand(skb, 2, 0, flags);
		dev_kfree_skb_any(skb);
		skb = skb2;
		if (!skb)
		return NULL;
		}
		skb_push(skb, 2);

		skb->data[0] = len;
		skb->data[1] = len >> 8;

		return skb;
		}


		static const struct driver_info cx82310_info = {
		.description = "Conexant CX82310 USB ethernet",
		.flags = FLAG_ETHER,
		.bind = cx82310_bind,
		.unbind = cx82310_unbind,
		.rx_fixup = cx82310_rx_fixup,
		.tx_fixup = cx82310_tx_fixup,
		};

		#define USB_DEVICE_CLASS(vend, prod, cl, sc, pr) \
		.match_flags = USB_DEVICE_ID_MATCH_DEVICE \| \
		USB_DEVICE_ID_MATCH_DEV_INFO, \
		.idVendor = (vend), \
		.idProduct = (prod), \
		.bDeviceClass = (cl), \
		.bDeviceSubClass = (sc), \
		.bDeviceProtocol = (pr)

		static const struct usb_device_id products[] = {
		{
		USB_DEVICE_CLASS(0x0572, 0xcb01, 0xff, 0, 0),
		.driver_info = (unsigned long) &cx82310_info
		},
		{ },
		};
		MODULE_DEVICE_TABLE(usb, products);

		static struct usb_driver cx82310_driver = {
		.name = "cx82310_eth",
		.id_table = products,
		.probe = usbnet_probe,
		.disconnect = usbnet_disconnect,
		.suspend = usbnet_suspend,
		.resume = usbnet_resume,
		};

		static int __init cx82310_init(void)
		{
		return usb_register(&cx82310_driver);
		}
		module_init(cx82310_init);

		static void __exit cx82310_exit(void)
		{
		usb_deregister(&cx82310_driver);
		}
		module_exit(cx82310_exit);

		MODULE_AUTHOR("Ondrej Zary");
		MODULE_DESCRIPTION("Conexant CX82310-based ADSL router USB ethernet driver");
		MODULE_LICENSE("GPL");

Admin message