summaryrefslogtreecommitdiffstats
path: root/drivers/usb/atm/xusbatm.c
blob: b3b1bb78b2ef458bb1bd78b3825f9895e24762a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
/******************************************************************************
 *  xusbatm.c -	dumb usbatm-based driver for modems initialized in userspace
 *
 *  Copyright (C) 2005 Duncan Sands, Roman Kagan (rkagan % mail ! ru)
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the Free
 *  Software Foundation; either version 2 of the License, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 *  more details.
 *
 *  You should have received a copy of the GNU General Public License along with
 *  this program; if not, write to the Free Software Foundation, Inc., 59
 *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 ******************************************************************************/

#include <linux/module.h>
#include <linux/etherdevice.h>		/* for eth_random_addr() */

#include "usbatm.h"


#define XUSBATM_DRIVERS_MAX	8

#define XUSBATM_PARM(name, type, parmtype, desc) \
	static type name[XUSBATM_DRIVERS_MAX]; \
	static unsigned int num_##name; \
	module_param_array(name, parmtype, &num_##name, 0444); \
	MODULE_PARM_DESC(name, desc)

XUSBATM_PARM(vendor, unsigned short, ushort, "USB device vendor");
XUSBATM_PARM(product, unsigned short, ushort, "USB device product");

XUSBATM_PARM(rx_endpoint, unsigned char, byte, "rx endpoint number");
XUSBATM_PARM(tx_endpoint, unsigned char, byte, "tx endpoint number");
XUSBATM_PARM(rx_padding, unsigned char, byte, "rx padding (default 0)");
XUSBATM_PARM(tx_padding, unsigned char, byte, "tx padding (default 0)");
XUSBATM_PARM(rx_altsetting, unsigned char, byte, "rx altsetting (default 0)");
XUSBATM_PARM(tx_altsetting, unsigned char, byte, "rx altsetting (default 0)");

static const char xusbatm_driver_name[] = "xusbatm";

static struct usbatm_driver xusbatm_drivers[XUSBATM_DRIVERS_MAX];
static struct usb_device_id xusbatm_usb_ids[XUSBATM_DRIVERS_MAX + 1];
static struct usb_driver xusbatm_usb_driver;

static struct usb_interface *xusbatm_find_intf(struct usb_device *usb_dev, int altsetting, u8 ep)
{
	struct usb_host_interface *alt;
	struct usb_interface *intf;
	int i, j;

	for (i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++)
		if ((intf = usb_dev->actconfig->interface[i]) && (alt = usb_altnum_to_altsetting(intf, altsetting)))
			for (j = 0; j < alt->desc.bNumEndpoints; j++)
				if (alt->endpoint[j].desc.bEndpointAddress == ep)
					return intf;
	return NULL;
}

static int xusbatm_capture_intf(struct usbatm_data *usbatm, struct usb_device *usb_dev,
		struct usb_interface *intf, int altsetting, int claim)
{
	int ifnum = intf->altsetting->desc.bInterfaceNumber;
	int ret;

	if (claim && (ret = usb_driver_claim_interface(&xusbatm_usb_driver, intf, usbatm))) {
		usb_err(usbatm, "%s: failed to claim interface %2d (%d)!\n", __func__, ifnum, ret);
		return ret;
	}
	if ((ret = usb_set_interface(usb_dev, ifnum, altsetting))) {
		usb_err(usbatm, "%s: altsetting %2d for interface %2d failed (%d)!\n", __func__, altsetting, ifnum, ret);
		return ret;
	}
	return 0;
}

static void xusbatm_release_intf(struct usb_device *usb_dev, struct usb_interface *intf, int claimed)
{
	if (claimed) {
		usb_set_intfdata(intf, NULL);
		usb_driver_release_interface(&xusbatm_usb_driver, intf);
	}
}

static int xusbatm_bind(struct usbatm_data *usbatm,
			struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	int drv_ix = id - xusbatm_usb_ids;
	int rx_alt = rx_altsetting[drv_ix];
	int tx_alt = tx_altsetting[drv_ix];
	struct usb_interface *rx_intf = xusbatm_find_intf(usb_dev, rx_alt, rx_endpoint[drv_ix]);
	struct usb_interface *tx_intf = xusbatm_find_intf(usb_dev, tx_alt, tx_endpoint[drv_ix]);
	int ret;

	usb_dbg(usbatm, "%s: binding driver %d: vendor %04x product %04x"
		" rx: ep %02x padd %d alt %2d tx: ep %02x padd %d alt %2d\n",
		__func__, drv_ix, vendor[drv_ix], product[drv_ix],
		rx_endpoint[drv_ix], rx_padding[drv_ix], rx_alt,
		tx_endpoint[drv_ix], tx_padding[drv_ix], tx_alt);

	if (!rx_intf || !tx_intf) {
		if (!rx_intf)
			usb_dbg(usbatm, "%s: no interface contains endpoint %02x in altsetting %2d\n",
				__func__, rx_endpoint[drv_ix], rx_alt);
		if (!tx_intf)
			usb_dbg(usbatm, "%s: no interface contains endpoint %02x in altsetting %2d\n",
				__func__, tx_endpoint[drv_ix], tx_alt);
		return -ENODEV;
	}

	if ((rx_intf != intf) && (tx_intf != intf))
		return -ENODEV;

	if ((rx_intf == tx_intf) && (rx_alt != tx_alt)) {
		usb_err(usbatm, "%s: altsettings clash on interface %2d (%2d vs %2d)!\n", __func__,
				rx_intf->altsetting->desc.bInterfaceNumber, rx_alt, tx_alt);
		return -EINVAL;
	}

	usb_dbg(usbatm, "%s: rx If#=%2d; tx If#=%2d\n", __func__,
			rx_intf->altsetting->desc.bInterfaceNumber,
			tx_intf->altsetting->desc.bInterfaceNumber);

	if ((ret = xusbatm_capture_intf(usbatm, usb_dev, rx_intf, rx_alt, rx_intf != intf)))
		return ret;

	if ((tx_intf != rx_intf) && (ret = xusbatm_capture_intf(usbatm, usb_dev, tx_intf, tx_alt, tx_intf != intf))) {
		xusbatm_release_intf(usb_dev, rx_intf, rx_intf != intf);
		return ret;
	}

	return 0;
}

static void xusbatm_unbind(struct usbatm_data *usbatm,
			   struct usb_interface *intf)
{
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	int i;

	usb_dbg(usbatm, "%s entered\n", __func__);

	for (i = 0; i < usb_dev->actconfig->desc.bNumInterfaces; i++) {
		struct usb_interface *cur_intf = usb_dev->actconfig->interface[i];

		if (cur_intf && (usb_get_intfdata(cur_intf) == usbatm)) {
			usb_set_intfdata(cur_intf, NULL);
			usb_driver_release_interface(&xusbatm_usb_driver, cur_intf);
		}
	}
}

static int xusbatm_atm_start(struct usbatm_data *usbatm,
			     struct atm_dev *atm_dev)
{
	atm_dbg(usbatm, "%s entered\n", __func__);

	/* use random MAC as we've no way to get it from the device */
	eth_random_addr(atm_dev->esi);

	return 0;
}


static int xusbatm_usb_probe(struct usb_interface *intf,
			     const struct usb_device_id *id)
{
	return usbatm_usb_probe(intf, id,
				xusbatm_drivers + (id - xusbatm_usb_ids));
}

static struct usb_driver xusbatm_usb_driver = {
	.name		= xusbatm_driver_name,
	.probe		= xusbatm_usb_probe,
	.disconnect	= usbatm_usb_disconnect,
	.id_table	= xusbatm_usb_ids
};

static int __init xusbatm_init(void)
{
	int i;

	if (!num_vendor ||
	    num_vendor != num_product ||
	    num_vendor != num_rx_endpoint ||
	    num_vendor != num_tx_endpoint) {
		printk(KERN_WARNING "xusbatm: malformed module parameters\n");
		return -EINVAL;
	}

	for (i = 0; i < num_vendor; i++) {
		rx_endpoint[i] |= USB_DIR_IN;
		tx_endpoint[i] &= USB_ENDPOINT_NUMBER_MASK;

		xusbatm_usb_ids[i].match_flags	= USB_DEVICE_ID_MATCH_DEVICE;
		xusbatm_usb_ids[i].idVendor	= vendor[i];
		xusbatm_usb_ids[i].idProduct	= product[i];

		xusbatm_drivers[i].driver_name	= xusbatm_driver_name;
		xusbatm_drivers[i].bind		= xusbatm_bind;
		xusbatm_drivers[i].unbind	= xusbatm_unbind;
		xusbatm_drivers[i].atm_start	= xusbatm_atm_start;
		xusbatm_drivers[i].bulk_in	= rx_endpoint[i];
		xusbatm_drivers[i].bulk_out	= tx_endpoint[i];
		xusbatm_drivers[i].rx_padding	= rx_padding[i];
		xusbatm_drivers[i].tx_padding	= tx_padding[i];
	}

	return usb_register(&xusbatm_usb_driver);
}
module_init(xusbatm_init);

static void __exit xusbatm_exit(void)
{
	usb_deregister(&xusbatm_usb_driver);
}
module_exit(xusbatm_exit);

MODULE_AUTHOR("Roman Kagan, Duncan Sands");
MODULE_DESCRIPTION("Driver for USB ADSL modems initialized in userspace");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1");
OpenPOWER on IntegriCloud