1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * See file CREDITS for list of people who contributed to this 4 * project. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 19 * MA 02111-1307 USA 20 */ 21 22 #include <common.h> 23 #include <usb.h> 24 25 #include "usb_ether.h" 26 27 typedef void (*usb_eth_before_probe)(void); 28 typedef int (*usb_eth_probe)(struct usb_device *dev, unsigned int ifnum, 29 struct ueth_data *ss); 30 typedef int (*usb_eth_get_info)(struct usb_device *dev, struct ueth_data *ss, 31 struct eth_device *dev_desc); 32 33 struct usb_eth_prob_dev { 34 usb_eth_before_probe before_probe; /* optional */ 35 usb_eth_probe probe; 36 usb_eth_get_info get_info; 37 }; 38 39 /* driver functions go here, each bracketed by #ifdef CONFIG_USB_ETHER_xxx */ 40 static const struct usb_eth_prob_dev prob_dev[] = { 41 { }, /* END */ 42 }; 43 44 static int usb_max_eth_dev; /* number of highest available usb eth device */ 45 static struct ueth_data usb_eth[USB_MAX_ETH_DEV]; 46 47 /******************************************************************************* 48 * tell if current ethernet device is a usb dongle 49 */ 50 int is_eth_dev_on_usb_host(void) 51 { 52 int i; 53 struct eth_device *dev = eth_get_dev(); 54 55 if (dev) { 56 for (i = 0; i < usb_max_eth_dev; i++) 57 if (&usb_eth[i].eth_dev == dev) 58 return 1; 59 } 60 return 0; 61 } 62 63 /* 64 * Given a USB device, ask each driver if it can support it, and attach it 65 * to the first driver that says 'yes' 66 */ 67 static void probe_valid_drivers(struct usb_device *dev) 68 { 69 int j; 70 71 for (j = 0; prob_dev[j].probe && prob_dev[j].get_info; j++) { 72 if (!prob_dev[j].probe(dev, 0, &usb_eth[usb_max_eth_dev])) 73 continue; 74 /* 75 * ok, it is a supported eth device. Get info and fill it in 76 */ 77 if (prob_dev[j].get_info(dev, 78 &usb_eth[usb_max_eth_dev], 79 &usb_eth[usb_max_eth_dev].eth_dev)) { 80 /* found proper driver */ 81 /* register with networking stack */ 82 usb_max_eth_dev++; 83 84 /* 85 * usb_max_eth_dev must be incremented prior to this 86 * call since eth_current_changed (internally called) 87 * relies on it 88 */ 89 eth_register(&usb_eth[usb_max_eth_dev - 1].eth_dev); 90 break; 91 } 92 } 93 } 94 95 /******************************************************************************* 96 * scan the usb and reports device info 97 * to the user if mode = 1 98 * returns current device or -1 if no 99 */ 100 int usb_host_eth_scan(int mode) 101 { 102 int i, old_async; 103 struct usb_device *dev; 104 105 106 if (mode == 1) 107 printf(" scanning bus for ethernet devices... "); 108 109 old_async = usb_disable_asynch(1); /* asynch transfer not allowed */ 110 111 for (i = 0; i < USB_MAX_ETH_DEV; i++) 112 memset(&usb_eth[i], 0, sizeof(usb_eth[i])); 113 114 for (i = 0; prob_dev[i].probe; i++) { 115 if (prob_dev[i].before_probe) 116 prob_dev[i].before_probe(); 117 } 118 119 usb_max_eth_dev = 0; 120 for (i = 0; i < USB_MAX_DEVICE; i++) { 121 dev = usb_get_dev_index(i); /* get device */ 122 debug("i=%d\n", i); 123 if (dev == NULL) 124 break; /* no more devices avaiable */ 125 126 /* find valid usb_ether driver for this device, if any */ 127 probe_valid_drivers(dev); 128 129 /* check limit */ 130 if (usb_max_eth_dev == USB_MAX_ETH_DEV) { 131 printf("max USB Ethernet Device reached: %d stopping\n", 132 usb_max_eth_dev); 133 break; 134 } 135 } /* for */ 136 137 usb_disable_asynch(old_async); /* restore asynch value */ 138 printf("%d Ethernet Device(s) found\n", usb_max_eth_dev); 139 if (usb_max_eth_dev > 0) 140 return 0; 141 return -1; 142 } 143 144