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_SMSC95XX 34 { 35 .before_probe = smsc95xx_eth_before_probe, 36 .probe = smsc95xx_eth_probe, 37 .get_info = smsc95xx_eth_get_info, 38 }, 39 #endif 40 { }, /* END */ 41 }; 42 43 static int usb_max_eth_dev; /* number of highest available usb eth device */ 44 static struct ueth_data usb_eth[USB_MAX_ETH_DEV]; 45 46 /******************************************************************************* 47 * tell if current ethernet device is a usb dongle 48 */ 49 int is_eth_dev_on_usb_host(void) 50 { 51 int i; 52 struct eth_device *dev = eth_get_dev(); 53 54 if (dev) { 55 for (i = 0; i < usb_max_eth_dev; i++) 56 if (&usb_eth[i].eth_dev == dev) 57 return 1; 58 } 59 return 0; 60 } 61 62 /* 63 * Given a USB device, ask each driver if it can support it, and attach it 64 * to the first driver that says 'yes' 65 */ 66 static void probe_valid_drivers(struct usb_device *dev) 67 { 68 struct eth_device *eth; 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 eth = &usb_eth[usb_max_eth_dev].eth_dev; 78 if (prob_dev[j].get_info(dev, 79 &usb_eth[usb_max_eth_dev], 80 eth)) { 81 /* found proper driver */ 82 /* register with networking stack */ 83 usb_max_eth_dev++; 84 85 /* 86 * usb_max_eth_dev must be incremented prior to this 87 * call since eth_current_changed (internally called) 88 * relies on it 89 */ 90 eth_register(eth); 91 if (eth_write_hwaddr(eth, "usbeth", 92 usb_max_eth_dev - 1)) 93 puts("Warning: failed to set MAC address\n"); 94 break; 95 } 96 } 97 } 98 99 /******************************************************************************* 100 * scan the usb and reports device info 101 * to the user if mode = 1 102 * returns current device or -1 if no 103 */ 104 int usb_host_eth_scan(int mode) 105 { 106 int i, old_async; 107 struct usb_device *dev; 108 109 110 if (mode == 1) 111 printf(" scanning usb for ethernet devices... "); 112 113 old_async = usb_disable_asynch(1); /* asynch transfer not allowed */ 114 115 /* unregister a previously detected device */ 116 for (i = 0; i < usb_max_eth_dev; i++) 117 eth_unregister(&usb_eth[i].eth_dev); 118 119 memset(usb_eth, 0, sizeof(usb_eth)); 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 available */ 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