1 /****************************************************************************** 2 * xusbatm.c - dumb usbatm-based driver for modems initialized in userspace 3 * 4 * Copyright (C) 2005 Duncan Sands, Roman Kagan (rkagan % mail ! ru) 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 59 18 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 * 20 ******************************************************************************/ 21 22 #include <linux/module.h> 23 #include <linux/netdevice.h> /* FIXME: required by linux/etherdevice.h */ 24 #include <linux/etherdevice.h> /* for random_ether_addr() */ 25 26 #include "usbatm.h" 27 28 29 #define XUSBATM_DRIVERS_MAX 8 30 31 #define XUSBATM_PARM(name, type, parmtype, desc) \ 32 static type name[XUSBATM_DRIVERS_MAX]; \ 33 static int num_##name; \ 34 module_param_array(name, parmtype, &num_##name, 0444); \ 35 MODULE_PARM_DESC(name, desc) 36 37 XUSBATM_PARM(vendor, unsigned short, ushort, "USB device vendor"); 38 XUSBATM_PARM(product, unsigned short, ushort, "USB device product"); 39 40 XUSBATM_PARM(rx_endpoint, unsigned char, byte, "rx endpoint number"); 41 XUSBATM_PARM(tx_endpoint, unsigned char, byte, "tx endpoint number"); 42 XUSBATM_PARM(rx_padding, unsigned char, byte, "rx padding (default 0)"); 43 XUSBATM_PARM(tx_padding, unsigned char, byte, "tx padding (default 0)"); 44 XUSBATM_PARM(rx_altsetting, unsigned char, byte, "rx altsetting (default 0)"); 45 XUSBATM_PARM(tx_altsetting, unsigned char, byte, "rx altsetting (default 0)"); 46 47 static const char xusbatm_driver_name[] = "xusbatm"; 48 49 static struct usbatm_driver xusbatm_drivers[XUSBATM_DRIVERS_MAX]; 50 static struct usb_device_id xusbatm_usb_ids[XUSBATM_DRIVERS_MAX + 1]; 51 static struct usb_driver xusbatm_usb_driver; 52 53 static struct usb_interface *xusbatm_find_intf (struct usb_device *usb_dev, int altsetting, u8 ep) 54 { 55 struct usb_host_interface *alt; 56 struct usb_interface *intf; 57 int i, j; 58 59 for(i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) 60 if ((intf = usb_dev->actconfig->interface[i]) && (alt = usb_altnum_to_altsetting(intf, altsetting))) 61 for (j = 0; j < alt->desc.bNumEndpoints; j++) 62 if (alt->endpoint[j].desc.bEndpointAddress == ep) 63 return intf; 64 return NULL; 65 } 66 67 static int xusbatm_capture_intf (struct usbatm_data *usbatm, struct usb_device *usb_dev, 68 struct usb_interface *intf, int altsetting, int claim) 69 { 70 int ifnum = intf->altsetting->desc.bInterfaceNumber; 71 int ret; 72 73 if (claim && (ret = usb_driver_claim_interface(&xusbatm_usb_driver, intf, usbatm))) { 74 usb_err(usbatm, "%s: failed to claim interface %2d (%d)!\n", __func__, ifnum, ret); 75 return ret; 76 } 77 if ((ret = usb_set_interface(usb_dev, ifnum, altsetting))) { 78 usb_err(usbatm, "%s: altsetting %2d for interface %2d failed (%d)!\n", __func__, altsetting, ifnum, ret); 79 return ret; 80 } 81 return 0; 82 } 83 84 static void xusbatm_release_intf (struct usb_device *usb_dev, struct usb_interface *intf, int claimed) 85 { 86 if (claimed) { 87 usb_set_intfdata(intf, NULL); 88 usb_driver_release_interface(&xusbatm_usb_driver, intf); 89 } 90 } 91 92 static int xusbatm_bind(struct usbatm_data *usbatm, 93 struct usb_interface *intf, const struct usb_device_id *id) 94 { 95 struct usb_device *usb_dev = interface_to_usbdev(intf); 96 int drv_ix = id - xusbatm_usb_ids; 97 int rx_alt = rx_altsetting[drv_ix]; 98 int tx_alt = tx_altsetting[drv_ix]; 99 struct usb_interface *rx_intf = xusbatm_find_intf(usb_dev, rx_alt, rx_endpoint[drv_ix]); 100 struct usb_interface *tx_intf = xusbatm_find_intf(usb_dev, tx_alt, tx_endpoint[drv_ix]); 101 int ret; 102 103 usb_dbg(usbatm, "%s: binding driver %d: vendor %04x product %04x" 104 " rx: ep %02x padd %d alt %2d tx: ep %02x padd %d alt %2d\n", 105 __func__, drv_ix, vendor[drv_ix], product[drv_ix], 106 rx_endpoint[drv_ix], rx_padding[drv_ix], rx_alt, 107 tx_endpoint[drv_ix], tx_padding[drv_ix], tx_alt); 108 109 if (!rx_intf || !tx_intf) { 110 if (!rx_intf) 111 usb_dbg(usbatm, "%s: no interface contains endpoint %02x in altsetting %2d\n", 112 __func__, rx_endpoint[drv_ix], rx_alt); 113 if (!tx_intf) 114 usb_dbg(usbatm, "%s: no interface contains endpoint %02x in altsetting %2d\n", 115 __func__, tx_endpoint[drv_ix], tx_alt); 116 return -ENODEV; 117 } 118 119 if ((rx_intf != intf) && (tx_intf != intf)) 120 return -ENODEV; 121 122 if ((rx_intf == tx_intf) && (rx_alt != tx_alt)) { 123 usb_err(usbatm, "%s: altsettings clash on interface %2d (%2d vs %2d)!\n", __func__, 124 rx_intf->altsetting->desc.bInterfaceNumber, rx_alt, tx_alt); 125 return -EINVAL; 126 } 127 128 usb_dbg(usbatm, "%s: rx If#=%2d; tx If#=%2d\n", __func__, 129 rx_intf->altsetting->desc.bInterfaceNumber, 130 tx_intf->altsetting->desc.bInterfaceNumber); 131 132 if ((ret = xusbatm_capture_intf(usbatm, usb_dev, rx_intf, rx_alt, rx_intf != intf))) 133 return ret; 134 135 if ((tx_intf != rx_intf) && (ret = xusbatm_capture_intf(usbatm, usb_dev, tx_intf, tx_alt, tx_intf != intf))) { 136 xusbatm_release_intf(usb_dev, rx_intf, rx_intf != intf); 137 return ret; 138 } 139 140 return 0; 141 } 142 143 static void xusbatm_unbind(struct usbatm_data *usbatm, 144 struct usb_interface *intf) 145 { 146 struct usb_device *usb_dev = interface_to_usbdev(intf); 147 int i; 148 149 usb_dbg(usbatm, "%s entered\n", __func__); 150 151 for(i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) { 152 struct usb_interface *cur_intf = usb_dev->actconfig->interface[i]; 153 154 if (cur_intf && (usb_get_intfdata(cur_intf) == usbatm)) { 155 usb_set_intfdata(cur_intf, NULL); 156 usb_driver_release_interface(&xusbatm_usb_driver, cur_intf); 157 } 158 } 159 } 160 161 static int xusbatm_atm_start(struct usbatm_data *usbatm, 162 struct atm_dev *atm_dev) 163 { 164 atm_dbg(usbatm, "%s entered\n", __func__); 165 166 /* use random MAC as we've no way to get it from the device */ 167 random_ether_addr(atm_dev->esi); 168 169 return 0; 170 } 171 172 173 static int xusbatm_usb_probe(struct usb_interface *intf, 174 const struct usb_device_id *id) 175 { 176 return usbatm_usb_probe(intf, id, 177 xusbatm_drivers + (id - xusbatm_usb_ids)); 178 } 179 180 static struct usb_driver xusbatm_usb_driver = { 181 .name = xusbatm_driver_name, 182 .probe = xusbatm_usb_probe, 183 .disconnect = usbatm_usb_disconnect, 184 .id_table = xusbatm_usb_ids 185 }; 186 187 static int __init xusbatm_init(void) 188 { 189 int i; 190 191 dbg("xusbatm_init"); 192 193 if (!num_vendor || 194 num_vendor != num_product || 195 num_vendor != num_rx_endpoint || 196 num_vendor != num_tx_endpoint) { 197 warn("malformed module parameters"); 198 return -EINVAL; 199 } 200 201 for (i = 0; i < num_vendor; i++) { 202 rx_endpoint[i] |= USB_DIR_IN; 203 tx_endpoint[i] &= USB_ENDPOINT_NUMBER_MASK; 204 205 xusbatm_usb_ids[i].match_flags = USB_DEVICE_ID_MATCH_DEVICE; 206 xusbatm_usb_ids[i].idVendor = vendor[i]; 207 xusbatm_usb_ids[i].idProduct = product[i]; 208 209 xusbatm_drivers[i].driver_name = xusbatm_driver_name; 210 xusbatm_drivers[i].bind = xusbatm_bind; 211 xusbatm_drivers[i].unbind = xusbatm_unbind; 212 xusbatm_drivers[i].atm_start = xusbatm_atm_start; 213 xusbatm_drivers[i].bulk_in = rx_endpoint[i]; 214 xusbatm_drivers[i].bulk_out = tx_endpoint[i]; 215 xusbatm_drivers[i].rx_padding = rx_padding[i]; 216 xusbatm_drivers[i].tx_padding = tx_padding[i]; 217 } 218 219 return usb_register(&xusbatm_usb_driver); 220 } 221 module_init(xusbatm_init); 222 223 static void __exit xusbatm_exit(void) 224 { 225 dbg("xusbatm_exit entered"); 226 227 usb_deregister(&xusbatm_usb_driver); 228 } 229 module_exit(xusbatm_exit); 230 231 MODULE_AUTHOR("Roman Kagan, Duncan Sands"); 232 MODULE_DESCRIPTION("Driver for USB ADSL modems initialized in userspace"); 233 MODULE_LICENSE("GPL"); 234 MODULE_VERSION("0.1"); 235