summaryrefslogtreecommitdiff
path: root/drivers/nfc/nfcmrvl/usb.c
blob: 6cf15c1a261831dadc5194bdc3615c7362c6ce0d (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
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
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
/**
 * Marvell NFC-over-USB driver: USB interface related functions
 *
 * Copyright (C) 2014, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available on the worldwide web at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 **/

#include <linux/module.h>
#include <linux/usb.h>
#include <linux/nfc.h>
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include "nfcmrvl.h"

#define VERSION "1.0"

static struct usb_device_id nfcmrvl_table[] = {
	{ USB_DEVICE_INTERFACE_CLASS(0x1286, 0x2046, 0xff) },
	{ }	/* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, nfcmrvl_table);

#define NFCMRVL_USB_BULK_RUNNING	1
#define NFCMRVL_USB_SUSPENDING		2

struct nfcmrvl_usb_drv_data {
	struct usb_device *udev;
	struct usb_interface *intf;
	unsigned long flags;
	struct work_struct waker;
	struct usb_anchor tx_anchor;
	struct usb_anchor bulk_anchor;
	struct usb_anchor deferred;
	int tx_in_flight;
	/* protects tx_in_flight */
	spinlock_t txlock;
	struct usb_endpoint_descriptor *bulk_tx_ep;
	struct usb_endpoint_descriptor *bulk_rx_ep;
	int suspend_count;
	struct nfcmrvl_private *priv;
};

static int nfcmrvl_inc_tx(struct nfcmrvl_usb_drv_data *drv_data)
{
	unsigned long flags;
	int rv;

	spin_lock_irqsave(&drv_data->txlock, flags);
	rv = test_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
	if (!rv)
		drv_data->tx_in_flight++;
	spin_unlock_irqrestore(&drv_data->txlock, flags);

	return rv;
}

static void nfcmrvl_bulk_complete(struct urb *urb)
{
	struct nfcmrvl_usb_drv_data *drv_data = urb->context;
	int err;

	dev_dbg(&drv_data->udev->dev, "urb %p status %d count %d",
		urb, urb->status, urb->actual_length);

	if (!test_bit(NFCMRVL_NCI_RUNNING, &drv_data->flags))
		return;

	if (!urb->status) {
		if (nfcmrvl_nci_recv_frame(drv_data->priv, urb->transfer_buffer,
					   urb->actual_length) < 0)
			nfc_err(&drv_data->udev->dev, "corrupted Rx packet\n");
	}

	if (!test_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags))
		return;

	usb_anchor_urb(urb, &drv_data->bulk_anchor);
	usb_mark_last_busy(drv_data->udev);

	err = usb_submit_urb(urb, GFP_ATOMIC);
	if (err) {
		/* -EPERM: urb is being killed;
		 * -ENODEV: device got disconnected
		 */
		if (err != -EPERM && err != -ENODEV)
			nfc_err(&drv_data->udev->dev,
				"urb %p failed to resubmit (%d)\n", urb, -err);
		usb_unanchor_urb(urb);
	}
}

static int
nfcmrvl_submit_bulk_urb(struct nfcmrvl_usb_drv_data *drv_data, gfp_t mem_flags)
{
	struct urb *urb;
	unsigned char *buf;
	unsigned int pipe;
	int err, size = NFCMRVL_NCI_MAX_EVENT_SIZE;

	if (!drv_data->bulk_rx_ep)
		return -ENODEV;

	urb = usb_alloc_urb(0, mem_flags);
	if (!urb)
		return -ENOMEM;

	buf = kmalloc(size, mem_flags);
	if (!buf) {
		usb_free_urb(urb);
		return -ENOMEM;
	}

	pipe = usb_rcvbulkpipe(drv_data->udev,
			       drv_data->bulk_rx_ep->bEndpointAddress);

	usb_fill_bulk_urb(urb, drv_data->udev, pipe, buf, size,
			  nfcmrvl_bulk_complete, drv_data);

	urb->transfer_flags |= URB_FREE_BUFFER;

	usb_mark_last_busy(drv_data->udev);
	usb_anchor_urb(urb, &drv_data->bulk_anchor);

	err = usb_submit_urb(urb, mem_flags);
	if (err) {
		if (err != -EPERM && err != -ENODEV)
			nfc_err(&drv_data->udev->dev,
				"urb %p submission failed (%d)\n", urb, -err);
		usb_unanchor_urb(urb);
	}

	usb_free_urb(urb);

	return err;
}

static void nfcmrvl_tx_complete(struct urb *urb)
{
	struct sk_buff *skb = urb->context;
	struct nci_dev *ndev = (struct nci_dev *)skb->dev;
	struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
	struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;

	nfc_info(priv->dev, "urb %p status %d count %d\n",
		 urb, urb->status, urb->actual_length);

	spin_lock(&drv_data->txlock);
	drv_data->tx_in_flight--;
	spin_unlock(&drv_data->txlock);

	kfree(urb->setup_packet);
	kfree_skb(skb);
}

static int nfcmrvl_usb_nci_open(struct nfcmrvl_private *priv)
{
	struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
	int err;

	err = usb_autopm_get_interface(drv_data->intf);
	if (err)
		return err;

	drv_data->intf->needs_remote_wakeup = 1;

	err = nfcmrvl_submit_bulk_urb(drv_data, GFP_KERNEL);
	if (err)
		goto failed;

	set_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
	nfcmrvl_submit_bulk_urb(drv_data, GFP_KERNEL);

	usb_autopm_put_interface(drv_data->intf);
	return 0;

failed:
	usb_autopm_put_interface(drv_data->intf);
	return err;
}

static void nfcmrvl_usb_stop_traffic(struct nfcmrvl_usb_drv_data *drv_data)
{
	usb_kill_anchored_urbs(&drv_data->bulk_anchor);
}

static int nfcmrvl_usb_nci_close(struct nfcmrvl_private *priv)
{
	struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
	int err;

	cancel_work_sync(&drv_data->waker);

	clear_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);

	nfcmrvl_usb_stop_traffic(drv_data);
	usb_kill_anchored_urbs(&drv_data->tx_anchor);
	err = usb_autopm_get_interface(drv_data->intf);
	if (err)
		goto failed;

	drv_data->intf->needs_remote_wakeup = 0;
	usb_autopm_put_interface(drv_data->intf);

failed:
	usb_scuttle_anchored_urbs(&drv_data->deferred);
	return 0;
}

static int nfcmrvl_usb_nci_send(struct nfcmrvl_private *priv,
				struct sk_buff *skb)
{
	struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
	struct urb *urb;
	unsigned int pipe;
	int err;

	if (!drv_data->bulk_tx_ep)
		return -ENODEV;

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb)
		return -ENOMEM;

	pipe = usb_sndbulkpipe(drv_data->udev,
				drv_data->bulk_tx_ep->bEndpointAddress);

	usb_fill_bulk_urb(urb, drv_data->udev, pipe, skb->data, skb->len,
			  nfcmrvl_tx_complete, skb);

	err = nfcmrvl_inc_tx(drv_data);
	if (err) {
		usb_anchor_urb(urb, &drv_data->deferred);
		schedule_work(&drv_data->waker);
		err = 0;
		goto done;
	}

	usb_anchor_urb(urb, &drv_data->tx_anchor);

	err = usb_submit_urb(urb, GFP_ATOMIC);
	if (err) {
		if (err != -EPERM && err != -ENODEV)
			nfc_err(&drv_data->udev->dev,
				"urb %p submission failed (%d)\n", urb, -err);
		kfree(urb->setup_packet);
		usb_unanchor_urb(urb);
	} else {
		usb_mark_last_busy(drv_data->udev);
	}

done:
	usb_free_urb(urb);
	return err;
}

static struct nfcmrvl_if_ops usb_ops = {
	.nci_open = nfcmrvl_usb_nci_open,
	.nci_close = nfcmrvl_usb_nci_close,
	.nci_send = nfcmrvl_usb_nci_send,
};

static void nfcmrvl_waker(struct work_struct *work)
{
	struct nfcmrvl_usb_drv_data *drv_data =
			container_of(work, struct nfcmrvl_usb_drv_data, waker);
	int err;

	err = usb_autopm_get_interface(drv_data->intf);
	if (err)
		return;

	usb_autopm_put_interface(drv_data->intf);
}

static int nfcmrvl_probe(struct usb_interface *intf,
			 const struct usb_device_id *id)
{
	struct usb_endpoint_descriptor *ep_desc;
	struct nfcmrvl_usb_drv_data *drv_data;
	struct nfcmrvl_private *priv;
	int i;
	struct usb_device *udev = interface_to_usbdev(intf);

	nfc_info(&udev->dev, "intf %p id %p\n", intf, id);

	drv_data = devm_kzalloc(&intf->dev, sizeof(*drv_data), GFP_KERNEL);
	if (!drv_data)
		return -ENOMEM;

	for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
		ep_desc = &intf->cur_altsetting->endpoint[i].desc;

		if (!drv_data->bulk_tx_ep &&
		    usb_endpoint_is_bulk_out(ep_desc)) {
			drv_data->bulk_tx_ep = ep_desc;
			continue;
		}

		if (!drv_data->bulk_rx_ep &&
		    usb_endpoint_is_bulk_in(ep_desc)) {
			drv_data->bulk_rx_ep = ep_desc;
			continue;
		}
	}

	if (!drv_data->bulk_tx_ep || !drv_data->bulk_rx_ep)
		return -ENODEV;

	drv_data->udev = udev;
	drv_data->intf = intf;

	INIT_WORK(&drv_data->waker, nfcmrvl_waker);
	spin_lock_init(&drv_data->txlock);

	init_usb_anchor(&drv_data->tx_anchor);
	init_usb_anchor(&drv_data->bulk_anchor);
	init_usb_anchor(&drv_data->deferred);

	priv = nfcmrvl_nci_register_dev(drv_data, &usb_ops,
					&drv_data->udev->dev);
	if (IS_ERR(priv))
		return PTR_ERR(priv);

	drv_data->priv = priv;
	priv->dev = &drv_data->udev->dev;

	usb_set_intfdata(intf, drv_data);

	return 0;
}

static void nfcmrvl_disconnect(struct usb_interface *intf)
{
	struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);

	if (!drv_data)
		return;

	nfc_info(&drv_data->udev->dev, "intf %p\n", intf);

	nfcmrvl_nci_unregister_dev(drv_data->priv);

	usb_set_intfdata(drv_data->intf, NULL);
}

#ifdef CONFIG_PM
static int nfcmrvl_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);

	nfc_info(&drv_data->udev->dev, "intf %p\n", intf);

	if (drv_data->suspend_count++)
		return 0;

	spin_lock_irq(&drv_data->txlock);
	if (!(PMSG_IS_AUTO(message) && drv_data->tx_in_flight)) {
		set_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
		spin_unlock_irq(&drv_data->txlock);
	} else {
		spin_unlock_irq(&drv_data->txlock);
		drv_data->suspend_count--;
		return -EBUSY;
	}

	nfcmrvl_usb_stop_traffic(drv_data);
	usb_kill_anchored_urbs(&drv_data->tx_anchor);

	return 0;
}

static void nfcmrvl_play_deferred(struct nfcmrvl_usb_drv_data *drv_data)
{
	struct urb *urb;
	int err;

	while ((urb = usb_get_from_anchor(&drv_data->deferred))) {
		err = usb_submit_urb(urb, GFP_ATOMIC);
		if (err)
			break;

		drv_data->tx_in_flight++;
	}
	usb_scuttle_anchored_urbs(&drv_data->deferred);
}

static int nfcmrvl_resume(struct usb_interface *intf)
{
	struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);
	int err = 0;

	nfc_info(&drv_data->udev->dev, "intf %p\n", intf);

	if (--drv_data->suspend_count)
		return 0;

	if (!test_bit(NFCMRVL_NCI_RUNNING, &drv_data->flags))
		goto done;

	if (test_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags)) {
		err = nfcmrvl_submit_bulk_urb(drv_data, GFP_NOIO);
		if (err) {
			clear_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
			goto failed;
		}

		nfcmrvl_submit_bulk_urb(drv_data, GFP_NOIO);
	}

	spin_lock_irq(&drv_data->txlock);
	nfcmrvl_play_deferred(drv_data);
	clear_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
	spin_unlock_irq(&drv_data->txlock);

	return 0;

failed:
	usb_scuttle_anchored_urbs(&drv_data->deferred);
done:
	spin_lock_irq(&drv_data->txlock);
	clear_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
	spin_unlock_irq(&drv_data->txlock);

	return err;
}
#endif

static struct usb_driver nfcmrvl_usb_driver = {
	.name		= "nfcmrvl",
	.probe		= nfcmrvl_probe,
	.disconnect	= nfcmrvl_disconnect,
#ifdef CONFIG_PM
	.suspend	= nfcmrvl_suspend,
	.resume		= nfcmrvl_resume,
	.reset_resume	= nfcmrvl_resume,
#endif
	.id_table	= nfcmrvl_table,
	.supports_autosuspend = 1,
	.disable_hub_initiated_lpm = 1,
	.soft_unbind = 1,
};
module_usb_driver(nfcmrvl_usb_driver);

MODULE_AUTHOR("Marvell International Ltd.");
MODULE_DESCRIPTION("Marvell NFC-over-USB driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL v2");