usb_ether.c 3.63 KB
Newer Older
1 2 3
/*
 * Copyright (c) 2011 The Chromium OS Authors.
 *
4
 * SPDX-License-Identifier:	GPL-2.0+
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
 */

#include <common.h>
#include <usb.h>

#include "usb_ether.h"

typedef void (*usb_eth_before_probe)(void);
typedef int (*usb_eth_probe)(struct usb_device *dev, unsigned int ifnum,
			struct ueth_data *ss);
typedef int (*usb_eth_get_info)(struct usb_device *dev, struct ueth_data *ss,
			struct eth_device *dev_desc);

struct usb_eth_prob_dev {
	usb_eth_before_probe	before_probe; /* optional */
	usb_eth_probe			probe;
	usb_eth_get_info		get_info;
};

/* driver functions go here, each bracketed by #ifdef CONFIG_USB_ETHER_xxx */
static const struct usb_eth_prob_dev prob_dev[] = {
26 27 28 29 30 31
#ifdef CONFIG_USB_ETHER_ASIX
	{
		.before_probe = asix_eth_before_probe,
		.probe = asix_eth_probe,
		.get_info = asix_eth_get_info,
	},
32 33 34 35 36 37 38
#endif
#ifdef CONFIG_USB_ETHER_SMSC95XX
	{
		.before_probe = smsc95xx_eth_before_probe,
		.probe = smsc95xx_eth_probe,
		.get_info = smsc95xx_eth_get_info,
	},
39
#endif
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67
	{ },		/* END */
};

static int usb_max_eth_dev; /* number of highest available usb eth device */
static struct ueth_data usb_eth[USB_MAX_ETH_DEV];

/*******************************************************************************
 * tell if current ethernet device is a usb dongle
 */
int is_eth_dev_on_usb_host(void)
{
	int i;
	struct eth_device *dev = eth_get_dev();

	if (dev) {
		for (i = 0; i < usb_max_eth_dev; i++)
			if (&usb_eth[i].eth_dev == dev)
				return 1;
	}
	return 0;
}

/*
 * Given a USB device, ask each driver if it can support it, and attach it
 * to the first driver that says 'yes'
 */
static void probe_valid_drivers(struct usb_device *dev)
{
68
	struct eth_device *eth;
69 70 71 72 73 74 75 76
	int j;

	for (j = 0; prob_dev[j].probe && prob_dev[j].get_info; j++) {
		if (!prob_dev[j].probe(dev, 0, &usb_eth[usb_max_eth_dev]))
			continue;
		/*
		 * ok, it is a supported eth device. Get info and fill it in
		 */
77
		eth = &usb_eth[usb_max_eth_dev].eth_dev;
78 79
		if (prob_dev[j].get_info(dev,
			&usb_eth[usb_max_eth_dev],
80
			eth)) {
81 82 83 84 85 86 87 88 89
			/* found proper driver */
			/* register with networking stack */
			usb_max_eth_dev++;

			/*
			 * usb_max_eth_dev must be incremented prior to this
			 * call since eth_current_changed (internally called)
			 * relies on it
			 */
90 91 92 93
			eth_register(eth);
			if (eth_write_hwaddr(eth, "usbeth",
					usb_max_eth_dev - 1))
				puts("Warning: failed to set MAC address\n");
94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110
			break;
			}
		}
	}

/*******************************************************************************
 * scan the usb and reports device info
 * to the user if mode = 1
 * returns current device or -1 if no
 */
int usb_host_eth_scan(int mode)
{
	int i, old_async;
	struct usb_device *dev;


	if (mode == 1)
111
		printf("       scanning usb for ethernet devices... ");
112 113 114

	old_async = usb_disable_asynch(1); /* asynch transfer not allowed */

115 116 117 118 119
	/* unregister a previously detected device */
	for (i = 0; i < usb_max_eth_dev; i++)
		eth_unregister(&usb_eth[i].eth_dev);

	memset(usb_eth, 0, sizeof(usb_eth));
120 121 122 123 124 125 126 127 128 129 130

	for (i = 0; prob_dev[i].probe; i++) {
		if (prob_dev[i].before_probe)
			prob_dev[i].before_probe();
	}

	usb_max_eth_dev = 0;
	for (i = 0; i < USB_MAX_DEVICE; i++) {
		dev = usb_get_dev_index(i); /* get device */
		debug("i=%d\n", i);
		if (dev == NULL)
Peter Meerwald's avatar
Peter Meerwald committed
131
			break; /* no more devices available */
132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149

		/* find valid usb_ether driver for this device, if any */
		probe_valid_drivers(dev);

		/* check limit */
		if (usb_max_eth_dev == USB_MAX_ETH_DEV) {
			printf("max USB Ethernet Device reached: %d stopping\n",
				usb_max_eth_dev);
			break;
		}
	} /* for */

	usb_disable_asynch(old_async); /* restore asynch value */
	printf("%d Ethernet Device(s) found\n", usb_max_eth_dev);
	if (usb_max_eth_dev > 0)
		return 0;
	return -1;
}