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/etherdevice.h> /* for eth_random_addr() */ 24 25 #include "usbatm.h" 26 27 28 #define XUSBATM_DRIVERS_MAX 8 29 30 #define XUSBATM_PARM(name, type, parmtype, desc) \ 31 static type name[XUSBATM_DRIVERS_MAX]; \ 32 static unsigned int num_##name; \ 33 module_param_array(name, parmtype, &num_##name, 0444); \ 34 MODULE_PARM_DESC(name, desc) 35 36 XUSBATM_PARM(vendor, unsigned short, ushort, "USB device vendor"); 37 XUSBATM_PARM(product, unsigned short, ushort, "USB device product"); 38 39 XUSBATM_PARM(rx_endpoint, unsigned char, byte, "rx endpoint number"); 40 XUSBATM_PARM(tx_endpoint, unsigned char, byte, "tx endpoint number"); 41 XUSBATM_PARM(rx_padding, unsigned char, byte, "rx padding (default 0)"); 42 XUSBATM_PARM(tx_padding, unsigned char, byte, "tx padding (default 0)"); 43 XUSBATM_PARM(rx_altsetting, unsigned char, byte, "rx altsetting (default 0)"); 44 XUSBATM_PARM(tx_altsetting, unsigned char, byte, "rx altsetting (default 0)"); 45 46 static const char xusbatm_driver_name[] = "xusbatm"; 47 48 static struct usbatm_driver xusbatm_drivers[XUSBATM_DRIVERS_MAX]; 49 static struct usb_device_id xusbatm_usb_ids[XUSBATM_DRIVERS_MAX + 1]; 50 static struct usb_driver xusbatm_usb_driver; 51 52 static struct usb_interface *xusbatm_find_intf(struct usb_device *usb_dev, int altsetting, u8 ep) 53 { 54 struct usb_host_interface *alt; 55 struct usb_interface *intf; 56 int i, j; 57 58 for (i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) 59 if ((intf = usb_dev->actconfig->interface[i]) && (alt = usb_altnum_to_altsetting(intf, altsetting))) 60 for (j = 0; j < alt->desc.bNumEndpoints; j++) 61 if (alt->endpoint[j].desc.bEndpointAddress == ep) 62 return intf; 63 return NULL; 64 } 65 66 static int xusbatm_capture_intf(struct usbatm_data *usbatm, struct usb_device *usb_dev, 67 struct usb_interface *intf, int altsetting, int claim) 68 { 69 int ifnum = intf->altsetting->desc.bInterfaceNumber; 70 int ret; 71 72 if (claim && (ret = usb_driver_claim_interface(&xusbatm_usb_driver, intf, usbatm))) { 73 usb_err(usbatm, "%s: failed to claim interface %2d (%d)!\n", __func__, ifnum, ret); 74 return ret; 75 } 76 ret = usb_set_interface(usb_dev, ifnum, altsetting); 77 if (ret) { 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 ret = xusbatm_capture_intf(usbatm, usb_dev, rx_intf, rx_alt, rx_intf != intf); 133 if (ret) 134 return ret; 135 136 if ((tx_intf != rx_intf) && (ret = xusbatm_capture_intf(usbatm, usb_dev, tx_intf, tx_alt, tx_intf != intf))) { 137 xusbatm_release_intf(usb_dev, rx_intf, rx_intf != intf); 138 return ret; 139 } 140 141 return 0; 142 } 143 144 static void xusbatm_unbind(struct usbatm_data *usbatm, 145 struct usb_interface *intf) 146 { 147 struct usb_device *usb_dev = interface_to_usbdev(intf); 148 int i; 149 150 usb_dbg(usbatm, "%s entered\n", __func__); 151 152 for (i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) { 153 struct usb_interface *cur_intf = usb_dev->actconfig->interface[i]; 154 155 if (cur_intf && (usb_get_intfdata(cur_intf) == usbatm)) { 156 usb_set_intfdata(cur_intf, NULL); 157 usb_driver_release_interface(&xusbatm_usb_driver, cur_intf); 158 } 159 } 160 } 161 162 static int xusbatm_atm_start(struct usbatm_data *usbatm, 163 struct atm_dev *atm_dev) 164 { 165 atm_dbg(usbatm, "%s entered\n", __func__); 166 167 /* use random MAC as we've no way to get it from the device */ 168 eth_random_addr(atm_dev->esi); 169 170 return 0; 171 } 172 173 174 static int xusbatm_usb_probe(struct usb_interface *intf, 175 const struct usb_device_id *id) 176 { 177 return usbatm_usb_probe(intf, id, 178 xusbatm_drivers + (id - xusbatm_usb_ids)); 179 } 180 181 static struct usb_driver xusbatm_usb_driver = { 182 .name = xusbatm_driver_name, 183 .probe = xusbatm_usb_probe, 184 .disconnect = usbatm_usb_disconnect, 185 .id_table = xusbatm_usb_ids 186 }; 187 188 static int __init xusbatm_init(void) 189 { 190 int i; 191 192 if (!num_vendor || 193 num_vendor != num_product || 194 num_vendor != num_rx_endpoint || 195 num_vendor != num_tx_endpoint) { 196 printk(KERN_WARNING "xusbatm: malformed module parameters\n"); 197 return -EINVAL; 198 } 199 200 for (i = 0; i < num_vendor; i++) { 201 rx_endpoint[i] |= USB_DIR_IN; 202 tx_endpoint[i] &= USB_ENDPOINT_NUMBER_MASK; 203 204 xusbatm_usb_ids[i].match_flags = USB_DEVICE_ID_MATCH_DEVICE; 205 xusbatm_usb_ids[i].idVendor = vendor[i]; 206 xusbatm_usb_ids[i].idProduct = product[i]; 207 208 xusbatm_drivers[i].driver_name = xusbatm_driver_name; 209 xusbatm_drivers[i].bind = xusbatm_bind; 210 xusbatm_drivers[i].unbind = xusbatm_unbind; 211 xusbatm_drivers[i].atm_start = xusbatm_atm_start; 212 xusbatm_drivers[i].bulk_in = rx_endpoint[i]; 213 xusbatm_drivers[i].bulk_out = tx_endpoint[i]; 214 xusbatm_drivers[i].rx_padding = rx_padding[i]; 215 xusbatm_drivers[i].tx_padding = tx_padding[i]; 216 } 217 218 return usb_register(&xusbatm_usb_driver); 219 } 220 module_init(xusbatm_init); 221 222 static void __exit xusbatm_exit(void) 223 { 224 usb_deregister(&xusbatm_usb_driver); 225 } 226 module_exit(xusbatm_exit); 227 228 MODULE_AUTHOR("Roman Kagan, Duncan Sands"); 229 MODULE_DESCRIPTION("Driver for USB ADSL modems initialized in userspace"); 230 MODULE_LICENSE("GPL"); 231 MODULE_VERSION("0.1"); 232