drivers/usb/eth/usb_ether.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <usb.h>
   9
  10 #include "usb_ether.h"
  11
  12 typedef void (*usb_eth_before_probe)(void);
  13 typedef int (*usb_eth_probe)(struct usb_device *dev, unsigned int ifnum,
  14                         struct ueth_data *ss);
  15 typedef int (*usb_eth_get_info)(struct usb_device *dev, struct ueth_data *ss,
  16                         struct eth_device *dev_desc);
  17
  18 struct usb_eth_prob_dev {
  19         usb_eth_before_probe    before_probe; /* optional */
  20         usb_eth_probe                   probe;
  21         usb_eth_get_info                get_info;
  22 };
  23
  24 /* driver functions go here, each bracketed by #ifdef CONFIG_USB_ETHER_xxx */
  25 static const struct usb_eth_prob_dev prob_dev[] = {
  26 #ifdef CONFIG_USB_ETHER_ASIX
  27         {
  28                 .before_probe = asix_eth_before_probe,
  29                 .probe = asix_eth_probe,
  30                 .get_info = asix_eth_get_info,
  31         },
  32 #endif
  33 #ifdef CONFIG_USB_ETHER_ASIX88179
  34         {
  35                 .before_probe = ax88179_eth_before_probe,
  36                 .probe = ax88179_eth_probe,
  37                 .get_info = ax88179_eth_get_info,
  38         },
  39 #endif
  40 #ifdef CONFIG_USB_ETHER_MCS7830
  41         {
  42                 .before_probe = mcs7830_eth_before_probe,
  43                 .probe = mcs7830_eth_probe,
  44                 .get_info = mcs7830_eth_get_info,
  45         },
  46 #endif
  47 #ifdef CONFIG_USB_ETHER_SMSC95XX
  48         {
  49                 .before_probe = smsc95xx_eth_before_probe,
  50                 .probe = smsc95xx_eth_probe,
  51                 .get_info = smsc95xx_eth_get_info,
  52         },
  53 #endif
  54         { },            /* END */
  55 };
  56
  57 static int usb_max_eth_dev; /* number of highest available usb eth device */
  58 static struct ueth_data usb_eth[USB_MAX_ETH_DEV];
  59
  60 /*******************************************************************************
  61  * tell if current ethernet device is a usb dongle
  62  */
  63 int is_eth_dev_on_usb_host(void)
  64 {
  65         int i;
  66         struct eth_device *dev = eth_get_dev();
  67
  68         if (dev) {
  69                 for (i = 0; i < usb_max_eth_dev; i++)
  70                         if (&usb_eth[i].eth_dev == dev)
  71                                 return 1;
  72         }
  73         return 0;
  74 }
  75
  76 /*
  77  * Given a USB device, ask each driver if it can support it, and attach it
  78  * to the first driver that says 'yes'
  79  */
  80 static void probe_valid_drivers(struct usb_device *dev)
  81 {
  82         struct eth_device *eth;
  83         int j;
  84
  85         for (j = 0; prob_dev[j].probe && prob_dev[j].get_info; j++) {
  86                 if (!prob_dev[j].probe(dev, 0, &usb_eth[usb_max_eth_dev]))
  87                         continue;
  88                 /*
  89                  * ok, it is a supported eth device. Get info and fill it in
  90                  */
  91                 eth = &usb_eth[usb_max_eth_dev].eth_dev;
  92                 if (prob_dev[j].get_info(dev,
  93                         &usb_eth[usb_max_eth_dev],
  94                         eth)) {
  95                         /* found proper driver */
  96                         /* register with networking stack */
  97                         usb_max_eth_dev++;
  98
  99                         /*
 100                          * usb_max_eth_dev must be incremented prior to this
 101                          * call since eth_current_changed (internally called)
 102                          * relies on it
 103                          */
 104                         eth_register(eth);
 105                         if (eth_write_hwaddr(eth, "usbeth",
 106                                         usb_max_eth_dev - 1))
 107                                 puts("Warning: failed to set MAC address\n");
 108                         break;
 109                         }
 110                 }
 111         }
 112
 113 /*******************************************************************************
 114  * scan the usb and reports device info
 115  * to the user if mode = 1
 116  * returns current device or -1 if no
 117  */
 118 int usb_host_eth_scan(int mode)
 119 {
 120         int i, old_async;
 121         struct usb_device *dev;
 122
 123
 124         if (mode == 1)
 125                 printf("       scanning usb for ethernet devices... ");
 126
 127         old_async = usb_disable_asynch(1); /* asynch transfer not allowed */
 128
 129         /* unregister a previously detected device */
 130         for (i = 0; i < usb_max_eth_dev; i++)
 131                 eth_unregister(&usb_eth[i].eth_dev);
 132
 133         memset(usb_eth, 0, sizeof(usb_eth));
 134
 135         for (i = 0; prob_dev[i].probe; i++) {
 136                 if (prob_dev[i].before_probe)
 137                         prob_dev[i].before_probe();
 138         }
 139
 140         usb_max_eth_dev = 0;
 141         for (i = 0; i < USB_MAX_DEVICE; i++) {
 142                 dev = usb_get_dev_index(i); /* get device */
 143                 debug("i=%d\n", i);
 144                 if (dev == NULL)
 145                         break; /* no more devices available */
 146
 147                 /* find valid usb_ether driver for this device, if any */
 148                 probe_valid_drivers(dev);
 149
 150                 /* check limit */
 151                 if (usb_max_eth_dev == USB_MAX_ETH_DEV) {
 152                         printf("max USB Ethernet Device reached: %d stopping\n",
 153                                 usb_max_eth_dev);
 154                         break;
 155                 }
 156         } /* for */
 157
 158         usb_disable_asynch(old_async); /* restore asynch value */
 159         printf("%d Ethernet Device(s) found\n", usb_max_eth_dev);
 160         if (usb_max_eth_dev > 0)
 161                 return 0;
 162         return -1;
 163 }