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Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[deliverable/linux.git] / drivers / net / ieee802154 / atusb.c
1 /*
2 * atusb.c - Driver for the ATUSB IEEE 802.15.4 dongle
3 *
4 * Written 2013 by Werner Almesberger <werner@almesberger.net>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2
9 *
10 * Based on at86rf230.c and spi_atusb.c.
11 * at86rf230.c is
12 * Copyright (C) 2009 Siemens AG
13 * Written by: Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com>
14 *
15 * spi_atusb.c is
16 * Copyright (c) 2011 Richard Sharpe <realrichardsharpe@gmail.com>
17 * Copyright (c) 2011 Stefan Schmidt <stefan@datenfreihafen.org>
18 * Copyright (c) 2011 Werner Almesberger <werner@almesberger.net>
19 *
20 * USB initialization is
21 * Copyright (c) 2013 Alexander Aring <alex.aring@gmail.com>
22 */
23
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/module.h>
27 #include <linux/jiffies.h>
28 #include <linux/usb.h>
29 #include <linux/skbuff.h>
30
31 #include <net/cfg802154.h>
32 #include <net/mac802154.h>
33
34 #include "at86rf230.h"
35 #include "atusb.h"
36
37 #define ATUSB_JEDEC_ATMEL 0x1f /* JEDEC manufacturer ID */
38
39 #define ATUSB_NUM_RX_URBS 4 /* allow for a bit of local latency */
40 #define ATUSB_ALLOC_DELAY_MS 100 /* delay after failed allocation */
41 #define ATUSB_TX_TIMEOUT_MS 200 /* on the air timeout */
42
43 struct atusb {
44 struct ieee802154_hw *hw;
45 struct usb_device *usb_dev;
46 int shutdown; /* non-zero if shutting down */
47 int err; /* set by first error */
48
49 /* RX variables */
50 struct delayed_work work; /* memory allocations */
51 struct usb_anchor idle_urbs; /* URBs waiting to be submitted */
52 struct usb_anchor rx_urbs; /* URBs waiting for reception */
53
54 /* TX variables */
55 struct usb_ctrlrequest tx_dr;
56 struct urb *tx_urb;
57 struct sk_buff *tx_skb;
58 uint8_t tx_ack_seq; /* current TX ACK sequence number */
59 };
60
61 /* ----- USB commands without data ----------------------------------------- */
62
63 /* To reduce the number of error checks in the code, we record the first error
64 * in atusb->err and reject all subsequent requests until the error is cleared.
65 */
66
67 static int atusb_control_msg(struct atusb *atusb, unsigned int pipe,
68 __u8 request, __u8 requesttype,
69 __u16 value, __u16 index,
70 void *data, __u16 size, int timeout)
71 {
72 struct usb_device *usb_dev = atusb->usb_dev;
73 int ret;
74
75 if (atusb->err)
76 return atusb->err;
77
78 ret = usb_control_msg(usb_dev, pipe, request, requesttype,
79 value, index, data, size, timeout);
80 if (ret < 0) {
81 atusb->err = ret;
82 dev_err(&usb_dev->dev,
83 "atusb_control_msg: req 0x%02x val 0x%x idx 0x%x, error %d\n",
84 request, value, index, ret);
85 }
86 return ret;
87 }
88
89 static int atusb_command(struct atusb *atusb, uint8_t cmd, uint8_t arg)
90 {
91 struct usb_device *usb_dev = atusb->usb_dev;
92
93 dev_dbg(&usb_dev->dev, "atusb_command: cmd = 0x%x\n", cmd);
94 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
95 cmd, ATUSB_REQ_TO_DEV, arg, 0, NULL, 0, 1000);
96 }
97
98 static int atusb_write_reg(struct atusb *atusb, uint8_t reg, uint8_t value)
99 {
100 struct usb_device *usb_dev = atusb->usb_dev;
101
102 dev_dbg(&usb_dev->dev, "atusb_write_reg: 0x%02x <- 0x%02x\n",
103 reg, value);
104 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
105 ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
106 value, reg, NULL, 0, 1000);
107 }
108
109 static int atusb_read_reg(struct atusb *atusb, uint8_t reg)
110 {
111 struct usb_device *usb_dev = atusb->usb_dev;
112 int ret;
113 uint8_t value;
114
115 dev_dbg(&usb_dev->dev, "atusb: reg = 0x%x\n", reg);
116 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
117 ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
118 0, reg, &value, 1, 1000);
119 return ret >= 0 ? value : ret;
120 }
121
122 static int atusb_write_subreg(struct atusb *atusb, uint8_t reg, uint8_t mask,
123 uint8_t shift, uint8_t value)
124 {
125 struct usb_device *usb_dev = atusb->usb_dev;
126 uint8_t orig, tmp;
127 int ret = 0;
128
129 dev_dbg(&usb_dev->dev, "atusb_write_subreg: 0x%02x <- 0x%02x\n",
130 reg, value);
131
132 orig = atusb_read_reg(atusb, reg);
133
134 /* Write the value only into that part of the register which is allowed
135 * by the mask. All other bits stay as before.
136 */
137 tmp = orig & ~mask;
138 tmp |= (value << shift) & mask;
139
140 if (tmp != orig)
141 ret = atusb_write_reg(atusb, reg, tmp);
142
143 return ret;
144 }
145
146 static int atusb_get_and_clear_error(struct atusb *atusb)
147 {
148 int err = atusb->err;
149
150 atusb->err = 0;
151 return err;
152 }
153
154 /* ----- skb allocation ---------------------------------------------------- */
155
156 #define MAX_PSDU 127
157 #define MAX_RX_XFER (1 + MAX_PSDU + 2 + 1) /* PHR+PSDU+CRC+LQI */
158
159 #define SKB_ATUSB(skb) (*(struct atusb **)(skb)->cb)
160
161 static void atusb_in(struct urb *urb);
162
163 static int atusb_submit_rx_urb(struct atusb *atusb, struct urb *urb)
164 {
165 struct usb_device *usb_dev = atusb->usb_dev;
166 struct sk_buff *skb = urb->context;
167 int ret;
168
169 if (!skb) {
170 skb = alloc_skb(MAX_RX_XFER, GFP_KERNEL);
171 if (!skb) {
172 dev_warn_ratelimited(&usb_dev->dev,
173 "atusb_in: can't allocate skb\n");
174 return -ENOMEM;
175 }
176 skb_put(skb, MAX_RX_XFER);
177 SKB_ATUSB(skb) = atusb;
178 }
179
180 usb_fill_bulk_urb(urb, usb_dev, usb_rcvbulkpipe(usb_dev, 1),
181 skb->data, MAX_RX_XFER, atusb_in, skb);
182 usb_anchor_urb(urb, &atusb->rx_urbs);
183
184 ret = usb_submit_urb(urb, GFP_KERNEL);
185 if (ret) {
186 usb_unanchor_urb(urb);
187 kfree_skb(skb);
188 urb->context = NULL;
189 }
190 return ret;
191 }
192
193 static void atusb_work_urbs(struct work_struct *work)
194 {
195 struct atusb *atusb =
196 container_of(to_delayed_work(work), struct atusb, work);
197 struct usb_device *usb_dev = atusb->usb_dev;
198 struct urb *urb;
199 int ret;
200
201 if (atusb->shutdown)
202 return;
203
204 do {
205 urb = usb_get_from_anchor(&atusb->idle_urbs);
206 if (!urb)
207 return;
208 ret = atusb_submit_rx_urb(atusb, urb);
209 } while (!ret);
210
211 usb_anchor_urb(urb, &atusb->idle_urbs);
212 dev_warn_ratelimited(&usb_dev->dev,
213 "atusb_in: can't allocate/submit URB (%d)\n", ret);
214 schedule_delayed_work(&atusb->work,
215 msecs_to_jiffies(ATUSB_ALLOC_DELAY_MS) + 1);
216 }
217
218 /* ----- Asynchronous USB -------------------------------------------------- */
219
220 static void atusb_tx_done(struct atusb *atusb, uint8_t seq)
221 {
222 struct usb_device *usb_dev = atusb->usb_dev;
223 uint8_t expect = atusb->tx_ack_seq;
224
225 dev_dbg(&usb_dev->dev, "atusb_tx_done (0x%02x/0x%02x)\n", seq, expect);
226 if (seq == expect) {
227 /* TODO check for ifs handling in firmware */
228 ieee802154_xmit_complete(atusb->hw, atusb->tx_skb, false);
229 } else {
230 /* TODO I experience this case when atusb has a tx complete
231 * irq before probing, we should fix the firmware it's an
232 * unlikely case now that seq == expect is then true, but can
233 * happen and fail with a tx_skb = NULL;
234 */
235 ieee802154_wake_queue(atusb->hw);
236 if (atusb->tx_skb)
237 dev_kfree_skb_irq(atusb->tx_skb);
238 }
239 }
240
241 static void atusb_in_good(struct urb *urb)
242 {
243 struct usb_device *usb_dev = urb->dev;
244 struct sk_buff *skb = urb->context;
245 struct atusb *atusb = SKB_ATUSB(skb);
246 uint8_t len, lqi;
247
248 if (!urb->actual_length) {
249 dev_dbg(&usb_dev->dev, "atusb_in: zero-sized URB ?\n");
250 return;
251 }
252
253 len = *skb->data;
254
255 if (urb->actual_length == 1) {
256 atusb_tx_done(atusb, len);
257 return;
258 }
259
260 if (len + 1 > urb->actual_length - 1) {
261 dev_dbg(&usb_dev->dev, "atusb_in: frame len %d+1 > URB %u-1\n",
262 len, urb->actual_length);
263 return;
264 }
265
266 if (!ieee802154_is_valid_psdu_len(len)) {
267 dev_dbg(&usb_dev->dev, "atusb_in: frame corrupted\n");
268 return;
269 }
270
271 lqi = skb->data[len + 1];
272 dev_dbg(&usb_dev->dev, "atusb_in: rx len %d lqi 0x%02x\n", len, lqi);
273 skb_pull(skb, 1); /* remove PHR */
274 skb_trim(skb, len); /* get payload only */
275 ieee802154_rx_irqsafe(atusb->hw, skb, lqi);
276 urb->context = NULL; /* skb is gone */
277 }
278
279 static void atusb_in(struct urb *urb)
280 {
281 struct usb_device *usb_dev = urb->dev;
282 struct sk_buff *skb = urb->context;
283 struct atusb *atusb = SKB_ATUSB(skb);
284
285 dev_dbg(&usb_dev->dev, "atusb_in: status %d len %d\n",
286 urb->status, urb->actual_length);
287 if (urb->status) {
288 if (urb->status == -ENOENT) { /* being killed */
289 kfree_skb(skb);
290 urb->context = NULL;
291 return;
292 }
293 dev_dbg(&usb_dev->dev, "atusb_in: URB error %d\n", urb->status);
294 } else {
295 atusb_in_good(urb);
296 }
297
298 usb_anchor_urb(urb, &atusb->idle_urbs);
299 if (!atusb->shutdown)
300 schedule_delayed_work(&atusb->work, 0);
301 }
302
303 /* ----- URB allocation/deallocation --------------------------------------- */
304
305 static void atusb_free_urbs(struct atusb *atusb)
306 {
307 struct urb *urb;
308
309 while (1) {
310 urb = usb_get_from_anchor(&atusb->idle_urbs);
311 if (!urb)
312 break;
313 if (urb->context)
314 kfree_skb(urb->context);
315 usb_free_urb(urb);
316 }
317 }
318
319 static int atusb_alloc_urbs(struct atusb *atusb, int n)
320 {
321 struct urb *urb;
322
323 while (n) {
324 urb = usb_alloc_urb(0, GFP_KERNEL);
325 if (!urb) {
326 atusb_free_urbs(atusb);
327 return -ENOMEM;
328 }
329 usb_anchor_urb(urb, &atusb->idle_urbs);
330 n--;
331 }
332 return 0;
333 }
334
335 /* ----- IEEE 802.15.4 interface operations -------------------------------- */
336
337 static void atusb_xmit_complete(struct urb *urb)
338 {
339 dev_dbg(&urb->dev->dev, "atusb_xmit urb completed");
340 }
341
342 static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
343 {
344 struct atusb *atusb = hw->priv;
345 struct usb_device *usb_dev = atusb->usb_dev;
346 int ret;
347
348 dev_dbg(&usb_dev->dev, "atusb_xmit (%d)\n", skb->len);
349 atusb->tx_skb = skb;
350 atusb->tx_ack_seq++;
351 atusb->tx_dr.wIndex = cpu_to_le16(atusb->tx_ack_seq);
352 atusb->tx_dr.wLength = cpu_to_le16(skb->len);
353
354 usb_fill_control_urb(atusb->tx_urb, usb_dev,
355 usb_sndctrlpipe(usb_dev, 0),
356 (unsigned char *)&atusb->tx_dr, skb->data,
357 skb->len, atusb_xmit_complete, NULL);
358 ret = usb_submit_urb(atusb->tx_urb, GFP_ATOMIC);
359 dev_dbg(&usb_dev->dev, "atusb_xmit done (%d)\n", ret);
360 return ret;
361 }
362
363 static int atusb_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
364 {
365 struct atusb *atusb = hw->priv;
366 int ret;
367
368 /* This implicitly sets the CCA (Clear Channel Assessment) mode to 0,
369 * "Mode 3a, Carrier sense OR energy above threshold".
370 * We should probably make this configurable. @@@
371 */
372 ret = atusb_write_reg(atusb, RG_PHY_CC_CCA, channel);
373 if (ret < 0)
374 return ret;
375 msleep(1); /* @@@ ugly synchronization */
376 return 0;
377 }
378
379 static int atusb_ed(struct ieee802154_hw *hw, u8 *level)
380 {
381 BUG_ON(!level);
382 *level = 0xbe;
383 return 0;
384 }
385
386 static int atusb_set_hw_addr_filt(struct ieee802154_hw *hw,
387 struct ieee802154_hw_addr_filt *filt,
388 unsigned long changed)
389 {
390 struct atusb *atusb = hw->priv;
391 struct device *dev = &atusb->usb_dev->dev;
392
393 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
394 u16 addr = le16_to_cpu(filt->short_addr);
395
396 dev_vdbg(dev, "atusb_set_hw_addr_filt called for saddr\n");
397 atusb_write_reg(atusb, RG_SHORT_ADDR_0, addr);
398 atusb_write_reg(atusb, RG_SHORT_ADDR_1, addr >> 8);
399 }
400
401 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
402 u16 pan = le16_to_cpu(filt->pan_id);
403
404 dev_vdbg(dev, "atusb_set_hw_addr_filt called for pan id\n");
405 atusb_write_reg(atusb, RG_PAN_ID_0, pan);
406 atusb_write_reg(atusb, RG_PAN_ID_1, pan >> 8);
407 }
408
409 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
410 u8 i, addr[IEEE802154_EXTENDED_ADDR_LEN];
411
412 memcpy(addr, &filt->ieee_addr, IEEE802154_EXTENDED_ADDR_LEN);
413 dev_vdbg(dev, "atusb_set_hw_addr_filt called for IEEE addr\n");
414 for (i = 0; i < 8; i++)
415 atusb_write_reg(atusb, RG_IEEE_ADDR_0 + i, addr[i]);
416 }
417
418 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
419 dev_vdbg(dev,
420 "atusb_set_hw_addr_filt called for panc change\n");
421 if (filt->pan_coord)
422 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1);
423 else
424 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0);
425 }
426
427 return atusb_get_and_clear_error(atusb);
428 }
429
430 static int atusb_start(struct ieee802154_hw *hw)
431 {
432 struct atusb *atusb = hw->priv;
433 struct usb_device *usb_dev = atusb->usb_dev;
434 int ret;
435
436 dev_dbg(&usb_dev->dev, "atusb_start\n");
437 schedule_delayed_work(&atusb->work, 0);
438 atusb_command(atusb, ATUSB_RX_MODE, 1);
439 ret = atusb_get_and_clear_error(atusb);
440 if (ret < 0)
441 usb_kill_anchored_urbs(&atusb->idle_urbs);
442 return ret;
443 }
444
445 static void atusb_stop(struct ieee802154_hw *hw)
446 {
447 struct atusb *atusb = hw->priv;
448 struct usb_device *usb_dev = atusb->usb_dev;
449
450 dev_dbg(&usb_dev->dev, "atusb_stop\n");
451 usb_kill_anchored_urbs(&atusb->idle_urbs);
452 atusb_command(atusb, ATUSB_RX_MODE, 0);
453 atusb_get_and_clear_error(atusb);
454 }
455
456 #define ATUSB_MAX_TX_POWERS 0xF
457 static const s32 atusb_powers[ATUSB_MAX_TX_POWERS + 1] = {
458 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
459 -900, -1200, -1700,
460 };
461
462 static int
463 atusb_set_txpower(struct ieee802154_hw *hw, s32 mbm)
464 {
465 struct atusb *atusb = hw->priv;
466 u32 i;
467
468 for (i = 0; i < hw->phy->supported.tx_powers_size; i++) {
469 if (hw->phy->supported.tx_powers[i] == mbm)
470 return atusb_write_subreg(atusb, SR_TX_PWR_23X, i);
471 }
472
473 return -EINVAL;
474 }
475
476 static int
477 atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
478 {
479 struct atusb *atusb = hw->priv;
480 int ret;
481
482 if (on) {
483 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1);
484 if (ret < 0)
485 return ret;
486
487 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1);
488 if (ret < 0)
489 return ret;
490 } else {
491 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0);
492 if (ret < 0)
493 return ret;
494
495 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0);
496 if (ret < 0)
497 return ret;
498 }
499
500 return 0;
501 }
502
503 static struct ieee802154_ops atusb_ops = {
504 .owner = THIS_MODULE,
505 .xmit_async = atusb_xmit,
506 .ed = atusb_ed,
507 .set_channel = atusb_channel,
508 .start = atusb_start,
509 .stop = atusb_stop,
510 .set_hw_addr_filt = atusb_set_hw_addr_filt,
511 .set_txpower = atusb_set_txpower,
512 .set_promiscuous_mode = atusb_set_promiscuous_mode,
513 };
514
515 /* ----- Firmware and chip version information ----------------------------- */
516
517 static int atusb_get_and_show_revision(struct atusb *atusb)
518 {
519 struct usb_device *usb_dev = atusb->usb_dev;
520 unsigned char buffer[3];
521 int ret;
522
523 /* Get a couple of the ATMega Firmware values */
524 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
525 ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0,
526 buffer, 3, 1000);
527 if (ret >= 0)
528 dev_info(&usb_dev->dev,
529 "Firmware: major: %u, minor: %u, hardware type: %u\n",
530 buffer[0], buffer[1], buffer[2]);
531 if (buffer[0] == 0 && buffer[1] < 2) {
532 dev_info(&usb_dev->dev,
533 "Firmware version (%u.%u) is predates our first public release.",
534 buffer[0], buffer[1]);
535 dev_info(&usb_dev->dev, "Please update to version 0.2 or newer");
536 }
537
538 return ret;
539 }
540
541 static int atusb_get_and_show_build(struct atusb *atusb)
542 {
543 struct usb_device *usb_dev = atusb->usb_dev;
544 char build[ATUSB_BUILD_SIZE + 1];
545 int ret;
546
547 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
548 ATUSB_BUILD, ATUSB_REQ_FROM_DEV, 0, 0,
549 build, ATUSB_BUILD_SIZE, 1000);
550 if (ret >= 0) {
551 build[ret] = 0;
552 dev_info(&usb_dev->dev, "Firmware: build %s\n", build);
553 }
554
555 return ret;
556 }
557
558 static int atusb_get_and_show_chip(struct atusb *atusb)
559 {
560 struct usb_device *usb_dev = atusb->usb_dev;
561 uint8_t man_id_0, man_id_1, part_num, version_num;
562 const char *chip;
563
564 man_id_0 = atusb_read_reg(atusb, RG_MAN_ID_0);
565 man_id_1 = atusb_read_reg(atusb, RG_MAN_ID_1);
566 part_num = atusb_read_reg(atusb, RG_PART_NUM);
567 version_num = atusb_read_reg(atusb, RG_VERSION_NUM);
568
569 if (atusb->err)
570 return atusb->err;
571
572 if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) {
573 dev_err(&usb_dev->dev,
574 "non-Atmel transceiver xxxx%02x%02x\n",
575 man_id_1, man_id_0);
576 goto fail;
577 }
578
579 switch (part_num) {
580 case 2:
581 chip = "AT86RF230";
582 break;
583 case 3:
584 chip = "AT86RF231";
585 break;
586 default:
587 dev_err(&usb_dev->dev,
588 "unexpected transceiver, part 0x%02x version 0x%02x\n",
589 part_num, version_num);
590 goto fail;
591 }
592
593 dev_info(&usb_dev->dev, "ATUSB: %s version %d\n", chip, version_num);
594
595 return 0;
596
597 fail:
598 atusb->err = -ENODEV;
599 return -ENODEV;
600 }
601
602 /* ----- Setup ------------------------------------------------------------- */
603
604 static int atusb_probe(struct usb_interface *interface,
605 const struct usb_device_id *id)
606 {
607 struct usb_device *usb_dev = interface_to_usbdev(interface);
608 struct ieee802154_hw *hw;
609 struct atusb *atusb = NULL;
610 int ret = -ENOMEM;
611
612 hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops);
613 if (!hw)
614 return -ENOMEM;
615
616 atusb = hw->priv;
617 atusb->hw = hw;
618 atusb->usb_dev = usb_get_dev(usb_dev);
619 usb_set_intfdata(interface, atusb);
620
621 atusb->shutdown = 0;
622 atusb->err = 0;
623 INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs);
624 init_usb_anchor(&atusb->idle_urbs);
625 init_usb_anchor(&atusb->rx_urbs);
626
627 if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS))
628 goto fail;
629
630 atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV;
631 atusb->tx_dr.bRequest = ATUSB_TX;
632 atusb->tx_dr.wValue = cpu_to_le16(0);
633
634 atusb->tx_urb = usb_alloc_urb(0, GFP_ATOMIC);
635 if (!atusb->tx_urb)
636 goto fail;
637
638 hw->parent = &usb_dev->dev;
639 hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
640 IEEE802154_HW_PROMISCUOUS;
641
642 hw->phy->flags = WPAN_PHY_FLAG_TXPOWER;
643
644 hw->phy->current_page = 0;
645 hw->phy->current_channel = 11; /* reset default */
646 hw->phy->supported.channels[0] = 0x7FFF800;
647 hw->phy->supported.tx_powers = atusb_powers;
648 hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
649 hw->phy->transmit_power = hw->phy->supported.tx_powers[0];
650 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
651
652 atusb_command(atusb, ATUSB_RF_RESET, 0);
653 atusb_get_and_show_chip(atusb);
654 atusb_get_and_show_revision(atusb);
655 atusb_get_and_show_build(atusb);
656 ret = atusb_get_and_clear_error(atusb);
657 if (ret) {
658 dev_err(&atusb->usb_dev->dev,
659 "%s: initialization failed, error = %d\n",
660 __func__, ret);
661 goto fail;
662 }
663
664 ret = ieee802154_register_hw(hw);
665 if (ret)
666 goto fail;
667
668 /* If we just powered on, we're now in P_ON and need to enter TRX_OFF
669 * explicitly. Any resets after that will send us straight to TRX_OFF,
670 * making the command below redundant.
671 */
672 atusb_write_reg(atusb, RG_TRX_STATE, STATE_FORCE_TRX_OFF);
673 msleep(1); /* reset => TRX_OFF, tTR13 = 37 us */
674
675 #if 0
676 /* Calculating the maximum time available to empty the frame buffer
677 * on reception:
678 *
679 * According to [1], the inter-frame gap is
680 * R * 20 * 16 us + 128 us
681 * where R is a random number from 0 to 7. Furthermore, we have 20 bit
682 * times (80 us at 250 kbps) of SHR of the next frame before the
683 * transceiver begins storing data in the frame buffer.
684 *
685 * This yields a minimum time of 208 us between the last data of a
686 * frame and the first data of the next frame. This time is further
687 * reduced by interrupt latency in the atusb firmware.
688 *
689 * atusb currently needs about 500 us to retrieve a maximum-sized
690 * frame. We therefore have to allow reception of a new frame to begin
691 * while we retrieve the previous frame.
692 *
693 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based
694 * network", Jennic 2006.
695 * http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
696 */
697
698 atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1);
699 #endif
700 atusb_write_reg(atusb, RG_IRQ_MASK, 0xff);
701
702 ret = atusb_get_and_clear_error(atusb);
703 if (!ret)
704 return 0;
705
706 dev_err(&atusb->usb_dev->dev,
707 "%s: setup failed, error = %d\n",
708 __func__, ret);
709
710 ieee802154_unregister_hw(hw);
711 fail:
712 atusb_free_urbs(atusb);
713 usb_kill_urb(atusb->tx_urb);
714 usb_free_urb(atusb->tx_urb);
715 usb_put_dev(usb_dev);
716 ieee802154_free_hw(hw);
717 return ret;
718 }
719
720 static void atusb_disconnect(struct usb_interface *interface)
721 {
722 struct atusb *atusb = usb_get_intfdata(interface);
723
724 dev_dbg(&atusb->usb_dev->dev, "atusb_disconnect\n");
725
726 atusb->shutdown = 1;
727 cancel_delayed_work_sync(&atusb->work);
728
729 usb_kill_anchored_urbs(&atusb->rx_urbs);
730 atusb_free_urbs(atusb);
731 usb_kill_urb(atusb->tx_urb);
732 usb_free_urb(atusb->tx_urb);
733
734 ieee802154_unregister_hw(atusb->hw);
735
736 ieee802154_free_hw(atusb->hw);
737
738 usb_set_intfdata(interface, NULL);
739 usb_put_dev(atusb->usb_dev);
740
741 pr_debug("atusb_disconnect done\n");
742 }
743
744 /* The devices we work with */
745 static const struct usb_device_id atusb_device_table[] = {
746 {
747 .match_flags = USB_DEVICE_ID_MATCH_DEVICE |
748 USB_DEVICE_ID_MATCH_INT_INFO,
749 .idVendor = ATUSB_VENDOR_ID,
750 .idProduct = ATUSB_PRODUCT_ID,
751 .bInterfaceClass = USB_CLASS_VENDOR_SPEC
752 },
753 /* end with null element */
754 {}
755 };
756 MODULE_DEVICE_TABLE(usb, atusb_device_table);
757
758 static struct usb_driver atusb_driver = {
759 .name = "atusb",
760 .probe = atusb_probe,
761 .disconnect = atusb_disconnect,
762 .id_table = atusb_device_table,
763 };
764 module_usb_driver(atusb_driver);
765
766 MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>");
767 MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>");
768 MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>");
769 MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>");
770 MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver");
771 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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