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 45 static const char xusbatm_driver_name[] = "xusbatm"; 46 47 static struct usbatm_driver xusbatm_drivers[XUSBATM_DRIVERS_MAX]; 48 static struct usb_device_id xusbatm_usb_ids[XUSBATM_DRIVERS_MAX + 1]; 49 static struct usb_driver xusbatm_usb_driver; 50 51 static int usb_intf_has_ep(const struct usb_interface *intf, u8 ep) 52 { 53 int i, j; 54 55 for (i = 0; i < intf->num_altsetting; i++) { 56 struct usb_host_interface *alt = intf->altsetting; 57 for (j = 0; j < alt->desc.bNumEndpoints; j++) 58 if ((alt->endpoint[i].desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) == ep) 59 return 1; 60 } 61 return 0; 62 } 63 64 static int xusbatm_bind(struct usbatm_data *usbatm_instance, 65 struct usb_interface *intf, const struct usb_device_id *id, 66 int *need_heavy_init) 67 { 68 struct usb_device *usb_dev = interface_to_usbdev(intf); 69 int drv_ix = id - xusbatm_usb_ids; 70 int rx_ep_present = usb_intf_has_ep(intf, rx_endpoint[drv_ix]); 71 int tx_ep_present = usb_intf_has_ep(intf, tx_endpoint[drv_ix]); 72 u8 searched_ep = rx_ep_present ? tx_endpoint[drv_ix] : rx_endpoint[drv_ix]; 73 int i, ret; 74 75 usb_dbg(usbatm_instance, "%s: binding driver %d: vendor %#x product %#x" 76 " rx: ep %#x padd %d tx: ep %#x padd %d\n", 77 __func__, drv_ix, vendor[drv_ix], product[drv_ix], 78 rx_endpoint[drv_ix], rx_padding[drv_ix], 79 tx_endpoint[drv_ix], tx_padding[drv_ix]); 80 81 if (!rx_ep_present && !tx_ep_present) { 82 usb_dbg(usbatm_instance, "%s: intf #%d has neither rx (%#x) nor tx (%#x) endpoint\n", 83 __func__, intf->altsetting->desc.bInterfaceNumber, 84 rx_endpoint[drv_ix], tx_endpoint[drv_ix]); 85 return -ENODEV; 86 } 87 88 if (rx_ep_present && tx_ep_present) 89 return 0; 90 91 for(i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) { 92 struct usb_interface *cur_if = usb_dev->actconfig->interface[i]; 93 94 if (cur_if != intf && usb_intf_has_ep(cur_if, searched_ep)) { 95 ret = usb_driver_claim_interface(&xusbatm_usb_driver, 96 cur_if, usbatm_instance); 97 if (!ret) 98 usb_err(usbatm_instance, "%s: failed to claim interface #%d (%d)\n", 99 __func__, cur_if->altsetting->desc.bInterfaceNumber, ret); 100 return ret; 101 } 102 } 103 104 usb_err(usbatm_instance, "%s: no interface has endpoint %#x\n", 105 __func__, searched_ep); 106 return -ENODEV; 107 } 108 109 static void xusbatm_unbind(struct usbatm_data *usbatm_instance, 110 struct usb_interface *intf) 111 { 112 struct usb_device *usb_dev = interface_to_usbdev(intf); 113 int i; 114 usb_dbg(usbatm_instance, "%s entered\n", __func__); 115 116 for(i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) { 117 struct usb_interface *cur_if = usb_dev->actconfig->interface[i]; 118 usb_set_intfdata(cur_if, NULL); 119 usb_driver_release_interface(&xusbatm_usb_driver, cur_if); 120 } 121 } 122 123 static int xusbatm_atm_start(struct usbatm_data *usbatm_instance, 124 struct atm_dev *atm_dev) 125 { 126 atm_dbg(usbatm_instance, "%s entered\n", __func__); 127 128 /* use random MAC as we've no way to get it from the device */ 129 random_ether_addr(atm_dev->esi); 130 131 return 0; 132 } 133 134 135 static int xusbatm_usb_probe(struct usb_interface *intf, 136 const struct usb_device_id *id) 137 { 138 return usbatm_usb_probe(intf, id, 139 xusbatm_drivers + (id - xusbatm_usb_ids)); 140 } 141 142 static struct usb_driver xusbatm_usb_driver = { 143 .owner = THIS_MODULE, 144 .name = xusbatm_driver_name, 145 .probe = xusbatm_usb_probe, 146 .disconnect = usbatm_usb_disconnect, 147 .id_table = xusbatm_usb_ids 148 }; 149 150 static int __init xusbatm_init(void) 151 { 152 int i; 153 154 dbg("xusbatm_init"); 155 156 if (!num_vendor || 157 num_vendor != num_product || 158 num_vendor != num_rx_endpoint || 159 num_vendor != num_tx_endpoint) { 160 warn("malformed module parameters"); 161 return -EINVAL; 162 } 163 164 for (i = 0; i < num_vendor; i++) { 165 xusbatm_usb_ids[i].match_flags = USB_DEVICE_ID_MATCH_DEVICE; 166 xusbatm_usb_ids[i].idVendor = vendor[i]; 167 xusbatm_usb_ids[i].idProduct = product[i]; 168 169 170 xusbatm_drivers[i].owner = THIS_MODULE; 171 xusbatm_drivers[i].driver_name = xusbatm_driver_name; 172 xusbatm_drivers[i].bind = xusbatm_bind; 173 xusbatm_drivers[i].unbind = xusbatm_unbind; 174 xusbatm_drivers[i].atm_start = xusbatm_atm_start; 175 xusbatm_drivers[i].in = rx_endpoint[i]; 176 xusbatm_drivers[i].out = tx_endpoint[i]; 177 xusbatm_drivers[i].rx_padding = rx_padding[i]; 178 xusbatm_drivers[i].tx_padding = tx_padding[i]; 179 } 180 181 return usb_register(&xusbatm_usb_driver); 182 } 183 module_init(xusbatm_init); 184 185 static void __exit xusbatm_exit(void) 186 { 187 dbg("xusbatm_exit entered"); 188 189 usb_deregister(&xusbatm_usb_driver); 190 } 191 module_exit(xusbatm_exit); 192 193 MODULE_AUTHOR("Roman Kagan, Duncan Sands"); 194 MODULE_DESCRIPTION("Driver for USB ADSL modems initialized in userspace"); 195 MODULE_LICENSE("GPL"); 196 MODULE_VERSION("0.1"); 197