// SPDX-License-Identifier: GPL-2.0+ /****************************************************************************** * xusbatm.c - dumb usbatm-based driver for modems initialized in userspace * * Copyright (C) 2005 Duncan Sands, Roman Kagan (rkagan % mail ! ru) ******************************************************************************/ #include <linux/module.h> #include <linux/etherdevice.h> /* for eth_random_addr() */ #include "usbatm.h" #define XUSBATM_DRIVERS_MAX 8 #define XUSBATM_PARM(name, type, parmtype, desc) \ static type name[XUSBATM_DRIVERS_MAX]; \ static unsigned 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)"); XUSBATM_PARM(rx_altsetting, unsigned char, byte, "rx altsetting (default 0)"); XUSBATM_PARM(tx_altsetting, unsigned char, byte, "rx altsetting (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 struct usb_interface *xusbatm_find_intf(struct usb_device *usb_dev, int altsetting, u8 ep) { struct usb_host_interface *alt; struct usb_interface *intf; int i, j; for (i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) if ((intf = usb_dev->actconfig->interface[i]) && (alt = usb_altnum_to_altsetting(intf, altsetting))) for (j = 0; j < alt->desc.bNumEndpoints; j++) if (alt->endpoint[j].desc.bEndpointAddress == ep) return intf; return NULL; } static int xusbatm_capture_intf(struct usbatm_data *usbatm, struct usb_device *usb_dev, struct usb_interface *intf, int altsetting, int claim) { int ifnum = intf->altsetting->desc.bInterfaceNumber; int ret; if (claim && (ret = usb_driver_claim_interface(&xusbatm_usb_driver, intf, usbatm))) { usb_err(usbatm, "%s: failed to claim interface %2d (%d)!\n", __func__, ifnum, ret); return ret; } ret = usb_set_interface(usb_dev, ifnum, altsetting); if (ret) { usb_err(usbatm, "%s: altsetting %2d for interface %2d failed (%d)!\n", __func__, altsetting, ifnum, ret); return ret; } return 0; } static void xusbatm_release_intf(struct usb_device *usb_dev, struct usb_interface *intf, int claimed) { if (claimed) { usb_set_intfdata(intf, NULL); usb_driver_release_interface(&xusbatm_usb_driver, intf); } } static int xusbatm_bind(struct usbatm_data *usbatm, struct usb_interface *intf, const struct usb_device_id *id) { struct usb_device *usb_dev = interface_to_usbdev(intf); int drv_ix = id - xusbatm_usb_ids; int rx_alt = rx_altsetting[drv_ix]; int tx_alt = tx_altsetting[drv_ix]; struct usb_interface *rx_intf = xusbatm_find_intf(usb_dev, rx_alt, rx_endpoint[drv_ix]); struct usb_interface *tx_intf = xusbatm_find_intf(usb_dev, tx_alt, tx_endpoint[drv_ix]); int ret; usb_dbg(usbatm, "%s: binding driver %d: vendor %04x product %04x" " rx: ep %02x padd %d alt %2d tx: ep %02x padd %d alt %2d\n", __func__, drv_ix, vendor[drv_ix], product[drv_ix], rx_endpoint[drv_ix], rx_padding[drv_ix], rx_alt, tx_endpoint[drv_ix], tx_padding[drv_ix], tx_alt); if (!rx_intf || !tx_intf) { if (!rx_intf) usb_dbg(usbatm, "%s: no interface contains endpoint %02x in altsetting %2d\n", __func__, rx_endpoint[drv_ix], rx_alt); if (!tx_intf) usb_dbg(usbatm, "%s: no interface contains endpoint %02x in altsetting %2d\n", __func__, tx_endpoint[drv_ix], tx_alt); return -ENODEV; } if ((rx_intf != intf) && (tx_intf != intf)) return -ENODEV; if ((rx_intf == tx_intf) && (rx_alt != tx_alt)) { usb_err(usbatm, "%s: altsettings clash on interface %2d (%2d vs %2d)!\n", __func__, rx_intf->altsetting->desc.bInterfaceNumber, rx_alt, tx_alt); return -EINVAL; } usb_dbg(usbatm, "%s: rx If#=%2d; tx If#=%2d\n", __func__, rx_intf->altsetting->desc.bInterfaceNumber, tx_intf->altsetting->desc.bInterfaceNumber); ret = xusbatm_capture_intf(usbatm, usb_dev, rx_intf, rx_alt, rx_intf != intf); if (ret) return ret; if ((tx_intf != rx_intf) && (ret = xusbatm_capture_intf(usbatm, usb_dev, tx_intf, tx_alt, tx_intf != intf))) { xusbatm_release_intf(usb_dev, rx_intf, rx_intf != intf); return ret; } return 0; } static void xusbatm_unbind(struct usbatm_data *usbatm, struct usb_interface *intf) { struct usb_device *usb_dev = interface_to_usbdev(intf); int i; usb_dbg(usbatm, "%s entered\n", __func__); for (i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) { struct usb_interface *cur_intf = usb_dev->actconfig->interface[i]; if (cur_intf && (usb_get_intfdata(cur_intf) == usbatm)) { usb_set_intfdata(cur_intf, NULL); usb_driver_release_interface(&xusbatm_usb_driver, cur_intf); } } } static int xusbatm_atm_start(struct usbatm_data *usbatm, struct atm_dev *atm_dev) { atm_dbg(usbatm, "%s entered\n", __func__); /* use random MAC as we've no way to get it from the device */ eth_random_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 = { .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; if (!num_vendor || num_vendor != num_product || num_vendor != num_rx_endpoint || num_vendor != num_tx_endpoint) { printk(KERN_WARNING "xusbatm: malformed module parameters\n"); return -EINVAL; } for (i = 0; i < num_vendor; i++) { rx_endpoint[i] |= USB_DIR_IN; tx_endpoint[i] &= USB_ENDPOINT_NUMBER_MASK; 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].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].bulk_in = rx_endpoint[i]; xusbatm_drivers[i].bulk_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) { 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");