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/etherdevice.h>          /* for random_ether_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         if ((ret = usb_set_interface(usb_dev, ifnum, altsetting))) {
  77                 usb_err(usbatm, "%s: altsetting %2d for interface %2d failed (%d)!\n", __func__, altsetting, ifnum, ret);
  78                 return ret;
  79         }
  80         return 0;
  81 }
  82
  83 static void xusbatm_release_intf(struct usb_device *usb_dev, struct usb_interface *intf, int claimed)
  84 {
  85         if (claimed) {
  86                 usb_set_intfdata(intf, NULL);
  87                 usb_driver_release_interface(&xusbatm_usb_driver, intf);
  88         }
  89 }
  90
  91 static int xusbatm_bind(struct usbatm_data *usbatm,
  92                         struct usb_interface *intf, const struct usb_device_id *id)
  93 {
  94         struct usb_device *usb_dev = interface_to_usbdev(intf);
  95         int drv_ix = id - xusbatm_usb_ids;
  96         int rx_alt = rx_altsetting[drv_ix];
  97         int tx_alt = tx_altsetting[drv_ix];
  98         struct usb_interface *rx_intf = xusbatm_find_intf(usb_dev, rx_alt, rx_endpoint[drv_ix]);
  99         struct usb_interface *tx_intf = xusbatm_find_intf(usb_dev, tx_alt, tx_endpoint[drv_ix]);
 100         int ret;
 101
 102         usb_dbg(usbatm, "%s: binding driver %d: vendor %04x product %04x"
 103                 " rx: ep %02x padd %d alt %2d tx: ep %02x padd %d alt %2d\n",
 104                 __func__, drv_ix, vendor[drv_ix], product[drv_ix],
 105                 rx_endpoint[drv_ix], rx_padding[drv_ix], rx_alt,
 106                 tx_endpoint[drv_ix], tx_padding[drv_ix], tx_alt);
 107
 108         if (!rx_intf || !tx_intf) {
 109                 if (!rx_intf)
 110                         usb_dbg(usbatm, "%s: no interface contains endpoint %02x in altsetting %2d\n",
 111                                 __func__, rx_endpoint[drv_ix], rx_alt);
 112                 if (!tx_intf)
 113                         usb_dbg(usbatm, "%s: no interface contains endpoint %02x in altsetting %2d\n",
 114                                 __func__, tx_endpoint[drv_ix], tx_alt);
 115                 return -ENODEV;
 116         }
 117
 118         if ((rx_intf != intf) && (tx_intf != intf))
 119                 return -ENODEV;
 120
 121         if ((rx_intf == tx_intf) && (rx_alt != tx_alt)) {
 122                 usb_err(usbatm, "%s: altsettings clash on interface %2d (%2d vs %2d)!\n", __func__,
 123                                 rx_intf->altsetting->desc.bInterfaceNumber, rx_alt, tx_alt);
 124                 return -EINVAL;
 125         }
 126
 127         usb_dbg(usbatm, "%s: rx If#=%2d; tx If#=%2d\n", __func__,
 128                         rx_intf->altsetting->desc.bInterfaceNumber,
 129                         tx_intf->altsetting->desc.bInterfaceNumber);
 130
 131         if ((ret = xusbatm_capture_intf(usbatm, usb_dev, rx_intf, rx_alt, rx_intf != intf)))
 132                 return ret;
 133
 134         if ((tx_intf != rx_intf) && (ret = xusbatm_capture_intf(usbatm, usb_dev, tx_intf, tx_alt, tx_intf != intf))) {
 135                 xusbatm_release_intf(usb_dev, rx_intf, rx_intf != intf);
 136                 return ret;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static void xusbatm_unbind(struct usbatm_data *usbatm,
 143                            struct usb_interface *intf)
 144 {
 145         struct usb_device *usb_dev = interface_to_usbdev(intf);
 146         int i;
 147
 148         usb_dbg(usbatm, "%s entered\n", __func__);
 149
 150         for (i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) {
 151                 struct usb_interface *cur_intf = usb_dev->actconfig->interface[i];
 152
 153                 if (cur_intf && (usb_get_intfdata(cur_intf) == usbatm)) {
 154                         usb_set_intfdata(cur_intf, NULL);
 155                         usb_driver_release_interface(&xusbatm_usb_driver, cur_intf);
 156                 }
 157         }
 158 }
 159
 160 static int xusbatm_atm_start(struct usbatm_data *usbatm,
 161                              struct atm_dev *atm_dev)
 162 {
 163         atm_dbg(usbatm, "%s entered\n", __func__);
 164
 165         /* use random MAC as we've no way to get it from the device */
 166         random_ether_addr(atm_dev->esi);
 167
 168         return 0;
 169 }
 170
 171
 172 static int xusbatm_usb_probe(struct usb_interface *intf,
 173                              const struct usb_device_id *id)
 174 {
 175         return usbatm_usb_probe(intf, id,
 176                                 xusbatm_drivers + (id - xusbatm_usb_ids));
 177 }
 178
 179 static struct usb_driver xusbatm_usb_driver = {
 180         .name           = xusbatm_driver_name,
 181         .probe          = xusbatm_usb_probe,
 182         .disconnect     = usbatm_usb_disconnect,
 183         .id_table       = xusbatm_usb_ids
 184 };
 185
 186 static int __init xusbatm_init(void)
 187 {
 188         int i;
 189
 190         dbg("xusbatm_init");
 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         dbg("xusbatm_exit entered");
 225
 226         usb_deregister(&xusbatm_usb_driver);
 227 }
 228 module_exit(xusbatm_exit);
 229
 230 MODULE_AUTHOR("Roman Kagan, Duncan Sands");
 231 MODULE_DESCRIPTION("Driver for USB ADSL modems initialized in userspace");
 232 MODULE_LICENSE("GPL");
 233 MODULE_VERSION("0.1");