[PATCH] USB ATM: generic DSL modem driver xusbatm

Doesn't do any firmware loading etc, just transmission and reception.
The user needs to take care of modem initialization, and load the
module with parameters giving the endpoints to use and so forth.
Signed-off-by: Duncan Sands <baldrick@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/atm/xusbatm.c

+/******************************************************************************
+ *  xusbatm.c -	dumb usbatm-based driver for modems initialized in userspace
+ *
+ *  Copyright (C) 2005 Duncan Sands, Roman Kagan (rkagan % mail ! ru)
+ *
+ *  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/netdevice.h>		/* FIXME: required by linux/etherdevice.h */
+#include <linux/etherdevice.h>		/* for random_ether_addr() */
+
+#include "usbatm.h"
+
+
+#define XUSBATM_DRIVERS_MAX	8
+
+#define XUSBATM_PARM(name, type, parmtype, desc) \
+	static type name[XUSBATM_DRIVERS_MAX]; \
+	static int num_##name; \
+	module_param_array(name, parmtype, &num_##name, 0444); \
+	MODULE_PARM_DESC(name, desc)
+
+XUSBATM_PARM(vendor, unsigned short, ushort, "USB device vendor");
+XUSBATM_PARM(product, unsigned short, ushort, "USB device product");
+
+XUSBATM_PARM(rx_endpoint, unsigned char, byte, "rx endpoint number");
+XUSBATM_PARM(tx_endpoint, unsigned char, byte, "tx endpoint number");
+XUSBATM_PARM(rx_padding, unsigned char, byte, "rx padding (default 0)");
+XUSBATM_PARM(tx_padding, unsigned char, byte, "tx padding (default 0)");
+
+static const char xusbatm_driver_name[] = "xusbatm";
+
+static struct usbatm_driver xusbatm_drivers[XUSBATM_DRIVERS_MAX];
+static struct usb_device_id xusbatm_usb_ids[XUSBATM_DRIVERS_MAX + 1];
+static struct usb_driver xusbatm_usb_driver;
+
+static int usb_intf_has_ep(const struct usb_interface *intf, u8 ep)
+{
+	int i, j;
+
+	for (i = 0; i < intf->num_altsetting; i++) {
+		struct usb_host_interface *alt = intf->altsetting;
+		for (j = 0; j < alt->desc.bNumEndpoints; j++)
+			if ((alt->endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) == ep)
+				return 1;
+	}
+	return 0;
+}
+
+static int xusbatm_bind(struct usbatm_data *usbatm_instance,
+			struct usb_interface *intf, const struct usb_device_id *id,
+			int *need_heavy_init)
+{
+	struct usb_device *usb_dev = interface_to_usbdev(intf);
+	int drv_ix = id - xusbatm_usb_ids;
+	int rx_ep_present = usb_intf_has_ep(intf, rx_endpoint[drv_ix]);
+	int tx_ep_present = usb_intf_has_ep(intf, tx_endpoint[drv_ix]);
+	u8 searched_ep = rx_ep_present ? tx_endpoint[drv_ix] : rx_endpoint[drv_ix];
+	int i, ret;
+
+	usb_dbg(usbatm_instance, "%s: binding driver %d: vendor %#x product %#x"
+		" rx: ep %#x padd %d tx: ep %#x padd %d\n",
+		__func__, drv_ix, vendor[drv_ix], product[drv_ix],
+		rx_endpoint[drv_ix], rx_padding[drv_ix],
+		tx_endpoint[drv_ix], tx_padding[drv_ix]);
+
+	if (!rx_ep_present && !tx_ep_present) {
+		usb_dbg(usbatm_instance, "%s: intf #%d has neither rx (%#x) nor tx (%#x) endpoint\n",
+			__func__, intf->altsetting->desc.bInterfaceNumber,
+			rx_endpoint[drv_ix], tx_endpoint[drv_ix]);
+		return -ENODEV;
+	}
+
+	if (rx_ep_present && tx_ep_present)
+		return 0;
+
+	for(i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) {
+		struct usb_interface *cur_if = usb_dev->actconfig->interface[i];
+
+		if (cur_if != intf && usb_intf_has_ep(cur_if, searched_ep)) {
+			ret = usb_driver_claim_interface(&xusbatm_usb_driver,
+							 cur_if, usbatm_instance);
+			if (!ret)
+				usb_err(usbatm_instance, "%s: failed to claim interface #%d (%d)\n",
+					__func__, cur_if->altsetting->desc.bInterfaceNumber, ret);
+			return ret;
+		}
+	}
+
+	usb_err(usbatm_instance, "%s: no interface has endpoint %#x\n",
+		__func__, searched_ep);
+	return -ENODEV;
+}
+
+static void xusbatm_unbind(struct usbatm_data *usbatm_instance,
+			   struct usb_interface *intf)
+{
+	struct usb_device *usb_dev = interface_to_usbdev(intf);
+	int i;
+	usb_dbg(usbatm_instance, "%s entered\n", __func__);
+
+	for(i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) {
+		struct usb_interface *cur_if = usb_dev->actconfig->interface[i];
+		usb_set_intfdata(cur_if, NULL);
+		usb_driver_release_interface(&xusbatm_usb_driver, cur_if);
+	}
+}
+
+static int xusbatm_atm_start(struct usbatm_data *usbatm_instance,
+			     struct atm_dev *atm_dev)
+{
+	atm_dbg(usbatm_instance, "%s entered\n", __func__);
+
+	/* use random MAC as we've no way to get it from the device */
+	random_ether_addr(atm_dev->esi);
+
+	return 0;
+}
+
+
+static int xusbatm_usb_probe(struct usb_interface *intf,
+			     const struct usb_device_id *id)
+{
+	return usbatm_usb_probe(intf, id,
+				xusbatm_drivers + (id - xusbatm_usb_ids));
+}
+
+static struct usb_driver xusbatm_usb_driver = {
+	.owner		= THIS_MODULE,
+	.name		= xusbatm_driver_name,
+	.probe		= xusbatm_usb_probe,
+	.disconnect	= usbatm_usb_disconnect,
+	.id_table	= xusbatm_usb_ids
+};
+
+static int __init xusbatm_init(void)
+{
+	int i;
+
+	dbg("xusbatm_init");
+
+	if (!num_vendor ||
+	    num_vendor != num_product ||
+	    num_vendor != num_rx_endpoint ||
+	    num_vendor != num_tx_endpoint) {
+		warn("malformed module parameters");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < num_vendor; i++) {
+		xusbatm_usb_ids[i].match_flags	= USB_DEVICE_ID_MATCH_DEVICE;
+		xusbatm_usb_ids[i].idVendor	= vendor[i];
+		xusbatm_usb_ids[i].idProduct	= product[i];
+
+
+		xusbatm_drivers[i].owner	= THIS_MODULE;
+		xusbatm_drivers[i].driver_name	= xusbatm_driver_name;
+		xusbatm_drivers[i].bind		= xusbatm_bind;
+		xusbatm_drivers[i].unbind	= xusbatm_unbind;
+		xusbatm_drivers[i].atm_start	= xusbatm_atm_start;
+		xusbatm_drivers[i].in		= rx_endpoint[i];
+		xusbatm_drivers[i].out		= tx_endpoint[i];
+		xusbatm_drivers[i].rx_padding	= rx_padding[i];
+		xusbatm_drivers[i].tx_padding	= tx_padding[i];
+	}
+
+	return usb_register(&xusbatm_usb_driver);
+}
+module_init(xusbatm_init);
+
+static void __exit xusbatm_exit(void)
+{
+	dbg("xusbatm_exit entered");
+
+	usb_deregister(&xusbatm_usb_driver);
+}
+module_exit(xusbatm_exit);
+
+MODULE_AUTHOR("Roman Kagan, Duncan Sands");
+MODULE_DESCRIPTION("Driver for USB ADSL modems initialized in userspace");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.1");