drivers/usb/atm/xusbatm.c

   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");