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 <dm.h>
   9 #include <usb.h>
  10 #include <dm/device-internal.h>
  11
  12 #include "usb_ether.h"
  13
  14 typedef void (*usb_eth_before_probe)(void);
  15 typedef int (*usb_eth_probe)(struct usb_device *dev, unsigned int ifnum,
  16                         struct ueth_data *ss);
  17 typedef int (*usb_eth_get_info)(struct usb_device *dev, struct ueth_data *ss,
  18                         struct eth_device *dev_desc);
  19
  20 struct usb_eth_prob_dev {
  21         usb_eth_before_probe    before_probe; /* optional */
  22         usb_eth_probe                   probe;
  23         usb_eth_get_info                get_info;
  24 };
  25
  26 /* driver functions go here, each bracketed by #ifdef CONFIG_USB_ETHER_xxx */
  27 static const struct usb_eth_prob_dev prob_dev[] = {
  28 #ifdef CONFIG_USB_ETHER_ASIX
  29         {
  30                 .before_probe = asix_eth_before_probe,
  31                 .probe = asix_eth_probe,
  32                 .get_info = asix_eth_get_info,
  33         },
  34 #endif
  35 #ifdef CONFIG_USB_ETHER_ASIX88179
  36         {
  37                 .before_probe = ax88179_eth_before_probe,
  38                 .probe = ax88179_eth_probe,
  39                 .get_info = ax88179_eth_get_info,
  40         },
  41 #endif
  42 #ifdef CONFIG_USB_ETHER_MCS7830
  43         {
  44                 .before_probe = mcs7830_eth_before_probe,
  45                 .probe = mcs7830_eth_probe,
  46                 .get_info = mcs7830_eth_get_info,
  47         },
  48 #endif
  49 #ifdef CONFIG_USB_ETHER_SMSC95XX
  50         {
  51                 .before_probe = smsc95xx_eth_before_probe,
  52                 .probe = smsc95xx_eth_probe,
  53                 .get_info = smsc95xx_eth_get_info,
  54         },
  55 #endif
  56         { },            /* END */
  57 };
  58
  59 static int usb_max_eth_dev; /* number of highest available usb eth device */
  60 static struct ueth_data usb_eth[USB_MAX_ETH_DEV];
  61
  62 /*******************************************************************************
  63  * tell if current ethernet device is a usb dongle
  64  */
  65 int is_eth_dev_on_usb_host(void)
  66 {
  67         int i;
  68         struct eth_device *dev = eth_get_dev();
  69
  70         if (dev) {
  71                 for (i = 0; i < usb_max_eth_dev; i++)
  72                         if (&usb_eth[i].eth_dev == dev)
  73                                 return 1;
  74         }
  75         return 0;
  76 }
  77
  78 /*
  79  * Given a USB device, ask each driver if it can support it, and attach it
  80  * to the first driver that says 'yes'
  81  */
  82 static void probe_valid_drivers(struct usb_device *dev)
  83 {
  84         struct eth_device *eth;
  85         int j;
  86
  87         for (j = 0; prob_dev[j].probe && prob_dev[j].get_info; j++) {
  88                 if (!prob_dev[j].probe(dev, 0, &usb_eth[usb_max_eth_dev]))
  89                         continue;
  90                 /*
  91                  * ok, it is a supported eth device. Get info and fill it in
  92                  */
  93                 eth = &usb_eth[usb_max_eth_dev].eth_dev;
  94                 if (prob_dev[j].get_info(dev,
  95                         &usb_eth[usb_max_eth_dev],
  96                         eth)) {
  97                         /* found proper driver */
  98                         /* register with networking stack */
  99                         usb_max_eth_dev++;
 100
 101                         /*
 102                          * usb_max_eth_dev must be incremented prior to this
 103                          * call since eth_current_changed (internally called)
 104                          * relies on it
 105                          */
 106                         eth_register(eth);
 107                         if (eth_write_hwaddr(eth, "usbeth",
 108                                         usb_max_eth_dev - 1))
 109                                 puts("Warning: failed to set MAC address\n");
 110                         break;
 111                         }
 112                 }
 113         }
 114
 115 /*******************************************************************************
 116  * scan the usb and reports device info
 117  * to the user if mode = 1
 118  * returns current device or -1 if no
 119  */
 120 int usb_host_eth_scan(int mode)
 121 {
 122         int i, old_async;
 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 #ifdef CONFIG_DM_USB
 142         /*
 143          * TODO: We should add USB_DEVICE() declarations to each USB ethernet
 144          * driver and then most of this file can be removed.
 145          */
 146         struct udevice *bus;
 147         struct uclass *uc;
 148         int ret;
 149
 150         ret = uclass_get(UCLASS_USB, &uc);
 151         if (ret)
 152                 return ret;
 153         uclass_foreach_dev(bus, uc) {
 154                 for (i = 0; i < USB_MAX_DEVICE; i++) {
 155                         struct usb_device *dev;
 156
 157                         dev = usb_get_dev_index(bus, i); /* get device */
 158                         debug("i=%d, %s\n", i, dev ? dev->dev->name : "(done)");
 159                         if (!dev)
 160                                 break; /* no more devices available */
 161
 162                         /*
 163                          * find valid usb_ether driver for this device,
 164                          * if any
 165                          */
 166                         probe_valid_drivers(dev);
 167
 168                         /* check limit */
 169                         if (usb_max_eth_dev == USB_MAX_ETH_DEV)
 170                                 break;
 171                 } /* for */
 172         }
 173 #else
 174         for (i = 0; i < USB_MAX_DEVICE; i++) {
 175                 struct usb_device *dev;
 176
 177                 dev = usb_get_dev_index(i); /* get device */
 178                 debug("i=%d\n", i);
 179                 if (!dev)
 180                         break; /* no more devices available */
 181
 182                 /* find valid usb_ether driver for this device, if any */
 183                 probe_valid_drivers(dev);
 184
 185                 /* check limit */
 186                 if (usb_max_eth_dev == USB_MAX_ETH_DEV)
 187                         break;
 188         } /* for */
 189 #endif
 190         if (usb_max_eth_dev == USB_MAX_ETH_DEV) {
 191                 printf("max USB Ethernet Device reached: %d stopping\n",
 192                        usb_max_eth_dev);
 193         }
 194         usb_disable_asynch(old_async); /* restore asynch value */
 195         printf("%d Ethernet Device(s) found\n", usb_max_eth_dev);
 196         if (usb_max_eth_dev > 0)
 197                 return 0;
 198         return -1;
 199 }