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8#include <linux/module.h>
9#include <linux/usb.h>
10#include <linux/nfc.h>
11#include <net/nfc/nci.h>
12#include <net/nfc/nci_core.h>
13#include "nfcmrvl.h"
14
15static struct usb_device_id nfcmrvl_table[] = {
16 { USB_DEVICE_AND_INTERFACE_INFO(0x1286, 0x2046,
17 USB_CLASS_VENDOR_SPEC, 4, 1) },
18 { }
19};
20
21MODULE_DEVICE_TABLE(usb, nfcmrvl_table);
22
23#define NFCMRVL_USB_BULK_RUNNING 1
24#define NFCMRVL_USB_SUSPENDING 2
25
26struct nfcmrvl_usb_drv_data {
27 struct usb_device *udev;
28 struct usb_interface *intf;
29 unsigned long flags;
30 struct work_struct waker;
31 struct usb_anchor tx_anchor;
32 struct usb_anchor bulk_anchor;
33 struct usb_anchor deferred;
34 int tx_in_flight;
35
36 spinlock_t txlock;
37 struct usb_endpoint_descriptor *bulk_tx_ep;
38 struct usb_endpoint_descriptor *bulk_rx_ep;
39 int suspend_count;
40 struct nfcmrvl_private *priv;
41};
42
43static int nfcmrvl_inc_tx(struct nfcmrvl_usb_drv_data *drv_data)
44{
45 unsigned long flags;
46 int rv;
47
48 spin_lock_irqsave(&drv_data->txlock, flags);
49 rv = test_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
50 if (!rv)
51 drv_data->tx_in_flight++;
52 spin_unlock_irqrestore(&drv_data->txlock, flags);
53
54 return rv;
55}
56
57static void nfcmrvl_bulk_complete(struct urb *urb)
58{
59 struct nfcmrvl_usb_drv_data *drv_data = urb->context;
60 int err;
61
62 dev_dbg(&drv_data->udev->dev, "urb %p status %d count %d\n",
63 urb, urb->status, urb->actual_length);
64
65 if (!test_bit(NFCMRVL_NCI_RUNNING, &drv_data->flags))
66 return;
67
68 if (!urb->status) {
69 struct sk_buff *skb;
70
71 skb = nci_skb_alloc(drv_data->priv->ndev, urb->actual_length,
72 GFP_ATOMIC);
73 if (!skb) {
74 nfc_err(&drv_data->udev->dev, "failed to alloc mem\n");
75 } else {
76 skb_put_data(skb, urb->transfer_buffer,
77 urb->actual_length);
78 if (nfcmrvl_nci_recv_frame(drv_data->priv, skb) < 0)
79 nfc_err(&drv_data->udev->dev,
80 "corrupted Rx packet\n");
81 }
82 }
83
84 if (!test_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags))
85 return;
86
87 usb_anchor_urb(urb, &drv_data->bulk_anchor);
88 usb_mark_last_busy(drv_data->udev);
89
90 err = usb_submit_urb(urb, GFP_ATOMIC);
91 if (err) {
92
93
94
95 if (err != -EPERM && err != -ENODEV)
96 nfc_err(&drv_data->udev->dev,
97 "urb %p failed to resubmit (%d)\n", urb, -err);
98 usb_unanchor_urb(urb);
99 }
100}
101
102static int
103nfcmrvl_submit_bulk_urb(struct nfcmrvl_usb_drv_data *drv_data, gfp_t mem_flags)
104{
105 struct urb *urb;
106 unsigned char *buf;
107 unsigned int pipe;
108 int err, size = NFCMRVL_NCI_MAX_EVENT_SIZE;
109
110 if (!drv_data->bulk_rx_ep)
111 return -ENODEV;
112
113 urb = usb_alloc_urb(0, mem_flags);
114 if (!urb)
115 return -ENOMEM;
116
117 buf = kmalloc(size, mem_flags);
118 if (!buf) {
119 usb_free_urb(urb);
120 return -ENOMEM;
121 }
122
123 pipe = usb_rcvbulkpipe(drv_data->udev,
124 drv_data->bulk_rx_ep->bEndpointAddress);
125
126 usb_fill_bulk_urb(urb, drv_data->udev, pipe, buf, size,
127 nfcmrvl_bulk_complete, drv_data);
128
129 urb->transfer_flags |= URB_FREE_BUFFER;
130
131 usb_mark_last_busy(drv_data->udev);
132 usb_anchor_urb(urb, &drv_data->bulk_anchor);
133
134 err = usb_submit_urb(urb, mem_flags);
135 if (err) {
136 if (err != -EPERM && err != -ENODEV)
137 nfc_err(&drv_data->udev->dev,
138 "urb %p submission failed (%d)\n", urb, -err);
139 usb_unanchor_urb(urb);
140 }
141
142 usb_free_urb(urb);
143
144 return err;
145}
146
147static void nfcmrvl_tx_complete(struct urb *urb)
148{
149 struct sk_buff *skb = urb->context;
150 struct nci_dev *ndev = (struct nci_dev *)skb->dev;
151 struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
152 struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
153 unsigned long flags;
154
155 nfc_info(priv->dev, "urb %p status %d count %d\n",
156 urb, urb->status, urb->actual_length);
157
158 spin_lock_irqsave(&drv_data->txlock, flags);
159 drv_data->tx_in_flight--;
160 spin_unlock_irqrestore(&drv_data->txlock, flags);
161
162 kfree(urb->setup_packet);
163 kfree_skb(skb);
164}
165
166static int nfcmrvl_usb_nci_open(struct nfcmrvl_private *priv)
167{
168 struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
169 int err;
170
171 err = usb_autopm_get_interface(drv_data->intf);
172 if (err)
173 return err;
174
175 drv_data->intf->needs_remote_wakeup = 1;
176
177 err = nfcmrvl_submit_bulk_urb(drv_data, GFP_KERNEL);
178 if (err)
179 goto failed;
180
181 set_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
182 nfcmrvl_submit_bulk_urb(drv_data, GFP_KERNEL);
183
184 usb_autopm_put_interface(drv_data->intf);
185 return 0;
186
187failed:
188 usb_autopm_put_interface(drv_data->intf);
189 return err;
190}
191
192static void nfcmrvl_usb_stop_traffic(struct nfcmrvl_usb_drv_data *drv_data)
193{
194 usb_kill_anchored_urbs(&drv_data->bulk_anchor);
195}
196
197static int nfcmrvl_usb_nci_close(struct nfcmrvl_private *priv)
198{
199 struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
200 int err;
201
202 cancel_work_sync(&drv_data->waker);
203
204 clear_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
205
206 nfcmrvl_usb_stop_traffic(drv_data);
207 usb_kill_anchored_urbs(&drv_data->tx_anchor);
208 err = usb_autopm_get_interface(drv_data->intf);
209 if (err)
210 goto failed;
211
212 drv_data->intf->needs_remote_wakeup = 0;
213 usb_autopm_put_interface(drv_data->intf);
214
215failed:
216 usb_scuttle_anchored_urbs(&drv_data->deferred);
217 return 0;
218}
219
220static int nfcmrvl_usb_nci_send(struct nfcmrvl_private *priv,
221 struct sk_buff *skb)
222{
223 struct nfcmrvl_usb_drv_data *drv_data = priv->drv_data;
224 struct urb *urb;
225 unsigned int pipe;
226 int err;
227
228 if (!drv_data->bulk_tx_ep)
229 return -ENODEV;
230
231 urb = usb_alloc_urb(0, GFP_ATOMIC);
232 if (!urb)
233 return -ENOMEM;
234
235 pipe = usb_sndbulkpipe(drv_data->udev,
236 drv_data->bulk_tx_ep->bEndpointAddress);
237
238 usb_fill_bulk_urb(urb, drv_data->udev, pipe, skb->data, skb->len,
239 nfcmrvl_tx_complete, skb);
240
241 err = nfcmrvl_inc_tx(drv_data);
242 if (err) {
243 usb_anchor_urb(urb, &drv_data->deferred);
244 schedule_work(&drv_data->waker);
245 err = 0;
246 goto done;
247 }
248
249 usb_anchor_urb(urb, &drv_data->tx_anchor);
250
251 err = usb_submit_urb(urb, GFP_ATOMIC);
252 if (err) {
253 if (err != -EPERM && err != -ENODEV)
254 nfc_err(&drv_data->udev->dev,
255 "urb %p submission failed (%d)\n", urb, -err);
256 kfree(urb->setup_packet);
257 usb_unanchor_urb(urb);
258 } else {
259 usb_mark_last_busy(drv_data->udev);
260 }
261
262done:
263 usb_free_urb(urb);
264 return err;
265}
266
267static const struct nfcmrvl_if_ops usb_ops = {
268 .nci_open = nfcmrvl_usb_nci_open,
269 .nci_close = nfcmrvl_usb_nci_close,
270 .nci_send = nfcmrvl_usb_nci_send,
271};
272
273static void nfcmrvl_waker(struct work_struct *work)
274{
275 struct nfcmrvl_usb_drv_data *drv_data =
276 container_of(work, struct nfcmrvl_usb_drv_data, waker);
277 int err;
278
279 err = usb_autopm_get_interface(drv_data->intf);
280 if (err)
281 return;
282
283 usb_autopm_put_interface(drv_data->intf);
284}
285
286static int nfcmrvl_probe(struct usb_interface *intf,
287 const struct usb_device_id *id)
288{
289 struct nfcmrvl_usb_drv_data *drv_data;
290 struct nfcmrvl_private *priv;
291 int i;
292 struct usb_device *udev = interface_to_usbdev(intf);
293 struct nfcmrvl_platform_data config;
294
295
296 memset(&config, 0, sizeof(config));
297 config.reset_n_io = -EINVAL;
298
299 nfc_info(&udev->dev, "intf %p id %p\n", intf, id);
300
301 drv_data = devm_kzalloc(&intf->dev, sizeof(*drv_data), GFP_KERNEL);
302 if (!drv_data)
303 return -ENOMEM;
304
305 for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
306 struct usb_endpoint_descriptor *ep_desc;
307
308 ep_desc = &intf->cur_altsetting->endpoint[i].desc;
309
310 if (!drv_data->bulk_tx_ep &&
311 usb_endpoint_is_bulk_out(ep_desc)) {
312 drv_data->bulk_tx_ep = ep_desc;
313 } else if (!drv_data->bulk_rx_ep &&
314 usb_endpoint_is_bulk_in(ep_desc)) {
315 drv_data->bulk_rx_ep = ep_desc;
316 }
317 }
318
319 if (!drv_data->bulk_tx_ep || !drv_data->bulk_rx_ep)
320 return -ENODEV;
321
322 drv_data->udev = udev;
323 drv_data->intf = intf;
324
325 INIT_WORK(&drv_data->waker, nfcmrvl_waker);
326 spin_lock_init(&drv_data->txlock);
327
328 init_usb_anchor(&drv_data->tx_anchor);
329 init_usb_anchor(&drv_data->bulk_anchor);
330 init_usb_anchor(&drv_data->deferred);
331
332 priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_USB, drv_data, &usb_ops,
333 &intf->dev, &config);
334 if (IS_ERR(priv))
335 return PTR_ERR(priv);
336
337 drv_data->priv = priv;
338 drv_data->priv->support_fw_dnld = false;
339
340 usb_set_intfdata(intf, drv_data);
341
342 return 0;
343}
344
345static void nfcmrvl_disconnect(struct usb_interface *intf)
346{
347 struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);
348
349 if (!drv_data)
350 return;
351
352 nfc_info(&drv_data->udev->dev, "intf %p\n", intf);
353
354 nfcmrvl_nci_unregister_dev(drv_data->priv);
355
356 usb_set_intfdata(drv_data->intf, NULL);
357}
358
359#ifdef CONFIG_PM
360static int nfcmrvl_suspend(struct usb_interface *intf, pm_message_t message)
361{
362 struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);
363
364 nfc_info(&drv_data->udev->dev, "intf %p\n", intf);
365
366 if (drv_data->suspend_count++)
367 return 0;
368
369 spin_lock_irq(&drv_data->txlock);
370 if (!(PMSG_IS_AUTO(message) && drv_data->tx_in_flight)) {
371 set_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
372 spin_unlock_irq(&drv_data->txlock);
373 } else {
374 spin_unlock_irq(&drv_data->txlock);
375 drv_data->suspend_count--;
376 return -EBUSY;
377 }
378
379 nfcmrvl_usb_stop_traffic(drv_data);
380 usb_kill_anchored_urbs(&drv_data->tx_anchor);
381
382 return 0;
383}
384
385static void nfcmrvl_play_deferred(struct nfcmrvl_usb_drv_data *drv_data)
386{
387 struct urb *urb;
388 int err;
389
390 while ((urb = usb_get_from_anchor(&drv_data->deferred))) {
391 err = usb_submit_urb(urb, GFP_ATOMIC);
392 if (err)
393 break;
394
395 drv_data->tx_in_flight++;
396 }
397 usb_scuttle_anchored_urbs(&drv_data->deferred);
398}
399
400static int nfcmrvl_resume(struct usb_interface *intf)
401{
402 struct nfcmrvl_usb_drv_data *drv_data = usb_get_intfdata(intf);
403 int err = 0;
404
405 nfc_info(&drv_data->udev->dev, "intf %p\n", intf);
406
407 if (--drv_data->suspend_count)
408 return 0;
409
410 if (!test_bit(NFCMRVL_NCI_RUNNING, &drv_data->flags))
411 goto done;
412
413 if (test_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags)) {
414 err = nfcmrvl_submit_bulk_urb(drv_data, GFP_NOIO);
415 if (err) {
416 clear_bit(NFCMRVL_USB_BULK_RUNNING, &drv_data->flags);
417 goto failed;
418 }
419
420 nfcmrvl_submit_bulk_urb(drv_data, GFP_NOIO);
421 }
422
423 spin_lock_irq(&drv_data->txlock);
424 nfcmrvl_play_deferred(drv_data);
425 clear_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
426 spin_unlock_irq(&drv_data->txlock);
427
428 return 0;
429
430failed:
431 usb_scuttle_anchored_urbs(&drv_data->deferred);
432done:
433 spin_lock_irq(&drv_data->txlock);
434 clear_bit(NFCMRVL_USB_SUSPENDING, &drv_data->flags);
435 spin_unlock_irq(&drv_data->txlock);
436
437 return err;
438}
439#endif
440
441static struct usb_driver nfcmrvl_usb_driver = {
442 .name = "nfcmrvl",
443 .probe = nfcmrvl_probe,
444 .disconnect = nfcmrvl_disconnect,
445#ifdef CONFIG_PM
446 .suspend = nfcmrvl_suspend,
447 .resume = nfcmrvl_resume,
448 .reset_resume = nfcmrvl_resume,
449#endif
450 .id_table = nfcmrvl_table,
451 .supports_autosuspend = 1,
452 .disable_hub_initiated_lpm = 1,
453 .soft_unbind = 1,
454};
455module_usb_driver(nfcmrvl_usb_driver);
456
457MODULE_AUTHOR("Marvell International Ltd.");
458MODULE_DESCRIPTION("Marvell NFC-over-USB driver");
459MODULE_LICENSE("GPL v2");
460
