aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/uwb/i1480/i1480u-wlp/lc.c
blob: 488b2e30a0a8b6d684e9ca686dc074ceb75442ee (plain) (blame)
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
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
/*
 * WUSB Wire Adapter: WLP interface
 * Driver for the Linux Network stack.
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * FIXME: docs
 *
 * This implements a very simple network driver for the WLP USB
 * device that is associated to a UWB (Ultra Wide Band) host.
 *
 * This is seen as an interface of a composite device. Once the UWB
 * host has an association to another WLP capable device, the
 * networking interface (aka WLP) can start to send packets back and
 * forth.
 *
 * Limitations:
 *
 *  - Hand cranked; can't ifup the interface until there is an association
 *
 *  - BW allocation very simplistic [see i1480u_mas_set() and callees].
 *
 *
 * ROADMAP:
 *
 *   ENTRY POINTS (driver model):
 *
 *     i1480u_driver_{exit,init}(): initialization of the driver.
 *
 *     i1480u_probe(): called by the driver code when a device
 *                     matching 'i1480u_id_table' is connected.
 *
 *                     This allocs a netdev instance, inits with
 *                     i1480u_add(), then registers_netdev().
 *         i1480u_init()
 *         i1480u_add()
 *
 *     i1480u_disconnect(): device has been disconnected/module
 *                          is being removed.
 *         i1480u_rm()
 */
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/uwb/debug.h>
#include "i1480u-wlp.h"



static inline
void i1480u_init(struct i1480u *i1480u)
{
	/* nothing so far... doesn't it suck? */
	spin_lock_init(&i1480u->lock);
	INIT_LIST_HEAD(&i1480u->tx_list);
	spin_lock_init(&i1480u->tx_list_lock);
	wlp_options_init(&i1480u->options);
	edc_init(&i1480u->tx_errors);
	edc_init(&i1480u->rx_errors);
#ifdef i1480u_FLOW_CONTROL
	edc_init(&i1480u->notif_edc);
#endif
	stats_init(&i1480u->lqe_stats);
	stats_init(&i1480u->rssi_stats);
	wlp_init(&i1480u->wlp);
}

/**
 * Fill WLP device information structure
 *
 * The structure will contain a few character arrays, each ending with a
 * null terminated string. Each string has to fit (excluding terminating
 * character) into a specified range obtained from the WLP substack.
 *
 * It is still not clear exactly how this device information should be
 * obtained. Until we find out we use the USB device descriptor as backup, some
 * information elements have intuitive mappings, other not.
 */
static
void i1480u_fill_device_info(struct wlp *wlp, struct wlp_device_info *dev_info)
{
	struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
	struct usb_device *usb_dev = i1480u->usb_dev;
	/* Treat device name and model name the same */
	if (usb_dev->descriptor.iProduct) {
		usb_string(usb_dev, usb_dev->descriptor.iProduct,
			   dev_info->name, sizeof(dev_info->name));
		usb_string(usb_dev, usb_dev->descriptor.iProduct,
			   dev_info->model_name, sizeof(dev_info->model_name));
	}
	if (usb_dev->descriptor.iManufacturer)
		usb_string(usb_dev, usb_dev->descriptor.iManufacturer,
			   dev_info->manufacturer,
			   sizeof(dev_info->manufacturer));
	scnprintf(dev_info->model_nr, sizeof(dev_info->model_nr), "%04x",
		  __le16_to_cpu(usb_dev->descriptor.bcdDevice));
	if (usb_dev->descriptor.iSerialNumber)
		usb_string(usb_dev, usb_dev->descriptor.iSerialNumber,
			   dev_info->serial, sizeof(dev_info->serial));
	/* FIXME: where should we obtain category? */
	dev_info->prim_dev_type.category = cpu_to_le16(WLP_DEV_CAT_OTHER);
	/* FIXME: Complete OUI and OUIsubdiv attributes */
}

#ifdef i1480u_FLOW_CONTROL
/**
 * Callback for the notification endpoint
 *
 * This mostly controls the xon/xoff protocol. In case of hard error,
 * we stop the queue. If not, we always retry.
 */
static
void i1480u_notif_cb(struct urb *urb, struct pt_regs *regs)
{
	struct i1480u *i1480u = urb->context;
	struct usb_interface *usb_iface = i1480u->usb_iface;
	struct device *dev = &usb_iface->dev;
	int result;

	switch (urb->status) {
	case 0:				/* Got valid data, do xon/xoff */
		switch (i1480u->notif_buffer[0]) {
		case 'N':
			dev_err(dev, "XOFF STOPPING queue at %lu\n", jiffies);
			netif_stop_queue(i1480u->net_dev);
			break;
		case 'A':
			dev_err(dev, "XON STARTING queue at %lu\n", jiffies);
			netif_start_queue(i1480u->net_dev);
			break;
		default:
			dev_err(dev, "NEP: unknown data 0x%02hhx\n",
				i1480u->notif_buffer[0]);
		}
		break;
	case -ECONNRESET:		/* Controlled situation ... */
	case -ENOENT:			/* we killed the URB... */
		dev_err(dev, "NEP: URB reset/noent %d\n", urb->status);
		goto error;
	case -ESHUTDOWN:		/* going away! */
		dev_err(dev, "NEP: URB down %d\n", urb->status);
		goto error;
	default:			/* Retry unless it gets ugly */
		if (edc_inc(&i1480u->notif_edc, EDC_MAX_ERRORS,
			    EDC_ERROR_TIMEFRAME)) {
			dev_err(dev, "NEP: URB max acceptable errors "
				"exceeded; resetting device\n");
			goto error_reset;
		}
		dev_err(dev, "NEP: URB error %d\n", urb->status);
		break;
	}
	result = usb_submit_urb(urb, GFP_ATOMIC);
	if (result < 0) {
		dev_err(dev, "NEP: Can't resubmit URB: %d; resetting device\n",
			result);
		goto error_reset;
	}
	return;

error_reset:
	wlp_reset_all(&i1480-wlp);
error:
	netif_stop_queue(i1480u->net_dev);
	return;
}
#endif

static
int i1480u_add(struct i1480u *i1480u, struct usb_interface *iface)
{
	int result = -ENODEV;
	struct wlp *wlp = &i1480u->wlp;
	struct usb_device *usb_dev = interface_to_usbdev(iface);
	struct net_device *net_dev = i1480u->net_dev;
	struct uwb_rc *rc;
	struct uwb_dev *uwb_dev;
#ifdef i1480u_FLOW_CONTROL
	struct usb_endpoint_descriptor *epd;
#endif

	i1480u->usb_dev = usb_get_dev(usb_dev);
	i1480u->usb_iface = iface;
	rc = uwb_rc_get_by_grandpa(&i1480u->usb_dev->dev);
	if (rc == NULL) {
		dev_err(&iface->dev, "Cannot get associated UWB Radio "
			"Controller\n");
		goto out;
	}
	wlp->xmit_frame = i1480u_xmit_frame;
	wlp->fill_device_info = i1480u_fill_device_info;
	wlp->stop_queue = i1480u_stop_queue;
	wlp->start_queue = i1480u_start_queue;
	result = wlp_setup(wlp, rc, net_dev);
	if (result < 0) {
		dev_err(&iface->dev, "Cannot setup WLP\n");
		goto error_wlp_setup;
	}
	result = 0;
	ether_setup(net_dev);			/* make it an etherdevice */
	uwb_dev = &rc->uwb_dev;
	/* FIXME: hookup address change notifications? */

	memcpy(net_dev->dev_addr, uwb_dev->mac_addr.data,
	       sizeof(net_dev->dev_addr));

	net_dev->hard_header_len = sizeof(struct untd_hdr_cmp)
		+ sizeof(struct wlp_tx_hdr)
		+ WLP_DATA_HLEN
		+ ETH_HLEN;
	net_dev->mtu = 3500;
	net_dev->tx_queue_len = 20;		/* FIXME: maybe use 1000? */

/*	net_dev->flags &= ~IFF_BROADCAST;	FIXME: BUG in firmware */
	/* FIXME: multicast disabled */
	net_dev->flags &= ~IFF_MULTICAST;
	net_dev->features &= ~NETIF_F_SG;
	net_dev->features &= ~NETIF_F_FRAGLIST;
	/* All NETIF_F_*_CSUM disabled */
	net_dev->features |= NETIF_F_HIGHDMA;
	net_dev->watchdog_timeo = 5*HZ;		/* FIXME: a better default? */

	net_dev->open = i1480u_open;
	net_dev->stop = i1480u_stop;
	net_dev->hard_start_xmit = i1480u_hard_start_xmit;
	net_dev->tx_timeout = i1480u_tx_timeout;
	net_dev->get_stats = i1480u_get_stats;
	net_dev->set_config = i1480u_set_config;
	net_dev->change_mtu = i1480u_change_mtu;

#ifdef i1480u_FLOW_CONTROL
	/* Notification endpoint setup (submitted when we open the device) */
	i1480u->notif_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (i1480u->notif_urb == NULL) {
		dev_err(&iface->dev, "Unable to allocate notification URB\n");
		result = -ENOMEM;
		goto error_urb_alloc;
	}
	epd = &iface->cur_altsetting->endpoint[0].desc;
	usb_fill_int_urb(i1480u->notif_urb, usb_dev,
			 usb_rcvintpipe(usb_dev, epd->bEndpointAddress),
			 i1480u->notif_buffer, sizeof(i1480u->notif_buffer),
			 i1480u_notif_cb, i1480u, epd->bInterval);

#endif

	i1480u->tx_inflight.max = i1480u_TX_INFLIGHT_MAX;
	i1480u->tx_inflight.threshold = i1480u_TX_INFLIGHT_THRESHOLD;
	i1480u->tx_inflight.restart_ts = jiffies;
	usb_set_intfdata(iface, i1480u);
	return result;

#ifdef i1480u_FLOW_CONTROL
error_urb_alloc:
#endif
	wlp_remove(wlp);
error_wlp_setup:
	uwb_rc_put(rc);
out:
	usb_put_dev(i1480u->usb_dev);
	return result;
}

static void i1480u_rm(struct i1480u *i1480u)
{
	struct uwb_rc *rc = i1480u->wlp.rc;
	usb_set_intfdata(i1480u->usb_iface, NULL);
#ifdef i1480u_FLOW_CONTROL
	usb_kill_urb(i1480u->notif_urb);
	usb_free_urb(i1480u->notif_urb);
#endif
	wlp_remove(&i1480u->wlp);
	uwb_rc_put(rc);
	usb_put_dev(i1480u->usb_dev);
}

/** Just setup @net_dev's i1480u private data */
static void i1480u_netdev_setup(struct net_device *net_dev)
{
	struct i1480u *i1480u = netdev_priv(net_dev);
	/* Initialize @i1480u */
	memset(i1480u, 0, sizeof(*i1480u));
	i1480u_init(i1480u);
}

/**
 * Probe a i1480u interface and register it
 *
 * @iface:   USB interface to link to
 * @id:      USB class/subclass/protocol id
 * @returns: 0 if ok, < 0 errno code on error.
 *
 * Does basic housekeeping stuff and then allocs a netdev with space
 * for the i1480u  data. Initializes, registers in i1480u, registers in
 * netdev, ready to go.
 */
static int i1480u_probe(struct usb_interface *iface,
			const struct usb_device_id *id)
{
	int result;
	struct net_device *net_dev;
	struct device *dev = &iface->dev;
	struct i1480u *i1480u;

	/* Allocate instance [calls i1480u_netdev_setup() on it] */
	result = -ENOMEM;
	net_dev = alloc_netdev(sizeof(*i1480u), "wlp%d", i1480u_netdev_setup);
	if (net_dev == NULL) {
		dev_err(dev, "no memory for network device instance\n");
		goto error_alloc_netdev;
	}
	SET_NETDEV_DEV(net_dev, dev);
	i1480u = netdev_priv(net_dev);
	i1480u->net_dev = net_dev;
	result = i1480u_add(i1480u, iface);	/* Now setup all the wlp stuff */
	if (result < 0) {
		dev_err(dev, "cannot add i1480u device: %d\n", result);
		goto error_i1480u_add;
	}
	result = register_netdev(net_dev);	/* Okey dokey, bring it up */
	if (result < 0) {
		dev_err(dev, "cannot register network device: %d\n", result);
		goto error_register_netdev;
	}
	i1480u_sysfs_setup(i1480u);
	if (result < 0)
		goto error_sysfs_init;
	return 0;

error_sysfs_init:
	unregister_netdev(net_dev);
error_register_netdev:
	i1480u_rm(i1480u);
error_i1480u_add:
	free_netdev(net_dev);
error_alloc_netdev:
	return result;
}


/**
 * Disconect a i1480u from the system.
 *
 * i1480u_stop() has been called before, so al the rx and tx contexts
 * have been taken down already. Make sure the queue is stopped,
 * unregister netdev and i1480u, free and kill.
 */
static void i1480u_disconnect(struct usb_interface *iface)
{
	struct i1480u *i1480u;
	struct net_device *net_dev;

	i1480u = usb_get_intfdata(iface);
	net_dev = i1480u->net_dev;
	netif_stop_queue(net_dev);
#ifdef i1480u_FLOW_CONTROL
	usb_kill_urb(i1480u->notif_urb);
#endif
	i1480u_sysfs_release(i1480u);
	unregister_netdev(net_dev);
	i1480u_rm(i1480u);
	free_netdev(net_dev);
}

static struct usb_device_id i1480u_id_table[] = {
	{
		.match_flags = USB_DEVICE_ID_MATCH_DEVICE \
				|  USB_DEVICE_ID_MATCH_DEV_INFO \
				|  USB_DEVICE_ID_MATCH_INT_INFO,
		.idVendor = 0x8086,
		.idProduct = 0x0c3b,
		.bDeviceClass = 0xef,
		.bDeviceSubClass = 0x02,
		.bDeviceProtocol = 0x02,
		.bInterfaceClass = 0xff,
		.bInterfaceSubClass = 0xff,
		.bInterfaceProtocol = 0xff,
	},
	{},
};
MODULE_DEVICE_TABLE(usb, i1480u_id_table);

static struct usb_driver i1480u_driver = {
	.name =		KBUILD_MODNAME,
	.probe =	i1480u_probe,
	.disconnect =	i1480u_disconnect,
	.id_table =	i1480u_id_table,
};

static int __init i1480u_driver_init(void)
{
	return usb_register(&i1480u_driver);
}
module_init(i1480u_driver_init);


static void __exit i1480u_driver_exit(void)
{
	usb_deregister(&i1480u_driver);
}
module_exit(i1480u_driver_exit);

MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
MODULE_DESCRIPTION("i1480 Wireless UWB Link WLP networking for USB");
MODULE_LICENSE("GPL");