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 #ifdef CONFIG_USB_ETHER_ASIX 42 { 43 .before_probe = asix_eth_before_probe, 44 .probe = asix_eth_probe, 45 .get_info = asix_eth_get_info, 46 }, 47 #endif 48 { }, /* END */ 49 }; 50 51 static int usb_max_eth_dev; /* number of highest available usb eth device */ 52 static struct ueth_data usb_eth[USB_MAX_ETH_DEV]; 53 54 /******************************************************************************* 55 * tell if current ethernet device is a usb dongle 56 */ 57 int is_eth_dev_on_usb_host(void) 58 { 59 int i; 60 struct eth_device *dev = eth_get_dev(); 61 62 if (dev) { 63 for (i = 0; i < usb_max_eth_dev; i++) 64 if (&usb_eth[i].eth_dev == dev) 65 return 1; 66 } 67 return 0; 68 } 69 70 /* 71 * Given a USB device, ask each driver if it can support it, and attach it 72 * to the first driver that says 'yes' 73 */ 74 static void probe_valid_drivers(struct usb_device *dev) 75 { 76 int j; 77 78 for (j = 0; prob_dev[j].probe && prob_dev[j].get_info; j++) { 79 if (!prob_dev[j].probe(dev, 0, &usb_eth[usb_max_eth_dev])) 80 continue; 81 /* 82 * ok, it is a supported eth device. Get info and fill it in 83 */ 84 if (prob_dev[j].get_info(dev, 85 &usb_eth[usb_max_eth_dev], 86 &usb_eth[usb_max_eth_dev].eth_dev)) { 87 /* found proper driver */ 88 /* register with networking stack */ 89 usb_max_eth_dev++; 90 91 /* 92 * usb_max_eth_dev must be incremented prior to this 93 * call since eth_current_changed (internally called) 94 * relies on it 95 */ 96 eth_register(&usb_eth[usb_max_eth_dev - 1].eth_dev); 97 break; 98 } 99 } 100 } 101 102 /******************************************************************************* 103 * scan the usb and reports device info 104 * to the user if mode = 1 105 * returns current device or -1 if no 106 */ 107 int usb_host_eth_scan(int mode) 108 { 109 int i, old_async; 110 struct usb_device *dev; 111 112 113 if (mode == 1) 114 printf(" scanning bus for ethernet devices... "); 115 116 old_async = usb_disable_asynch(1); /* asynch transfer not allowed */ 117 118 for (i = 0; i < USB_MAX_ETH_DEV; i++) 119 memset(&usb_eth[i], 0, sizeof(usb_eth[i])); 120 121 for (i = 0; prob_dev[i].probe; i++) { 122 if (prob_dev[i].before_probe) 123 prob_dev[i].before_probe(); 124 } 125 126 usb_max_eth_dev = 0; 127 for (i = 0; i < USB_MAX_DEVICE; i++) { 128 dev = usb_get_dev_index(i); /* get device */ 129 debug("i=%d\n", i); 130 if (dev == NULL) 131 break; /* no more devices avaiable */ 132 133 /* find valid usb_ether driver for this device, if any */ 134 probe_valid_drivers(dev); 135 136 /* check limit */ 137 if (usb_max_eth_dev == USB_MAX_ETH_DEV) { 138 printf("max USB Ethernet Device reached: %d stopping\n", 139 usb_max_eth_dev); 140 break; 141 } 142 } /* for */ 143 144 usb_disable_asynch(old_async); /* restore asynch value */ 145 printf("%d Ethernet Device(s) found\n", usb_max_eth_dev); 146 if (usb_max_eth_dev > 0) 147 return 0; 148 return -1; 149 } 150