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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 | // 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) { pr_warn("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"); |