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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
[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 * Copyright (c) 2015 - 2016 Stefan Schmidt <stefan@datenfreihafen.org>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation, version 2
11 *
12 * Based on at86rf230.c and spi_atusb.c.
13 * at86rf230.c is
14 * Copyright (C) 2009 Siemens AG
15 * Written by: Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com>
16 *
17 * spi_atusb.c is
18 * Copyright (c) 2011 Richard Sharpe <realrichardsharpe@gmail.com>
19 * Copyright (c) 2011 Stefan Schmidt <stefan@datenfreihafen.org>
20 * Copyright (c) 2011 Werner Almesberger <werner@almesberger.net>
21 *
22 * USB initialization is
23 * Copyright (c) 2013 Alexander Aring <alex.aring@gmail.com>
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/module.h>
29 #include <linux/jiffies.h>
30 #include <linux/usb.h>
31 #include <linux/skbuff.h>
32
33 #include <net/cfg802154.h>
34 #include <net/mac802154.h>
35
36 #include "at86rf230.h"
37 #include "atusb.h"
38
39 #define ATUSB_JEDEC_ATMEL 0x1f /* JEDEC manufacturer ID */
40
41 #define ATUSB_NUM_RX_URBS 4 /* allow for a bit of local latency */
42 #define ATUSB_ALLOC_DELAY_MS 100 /* delay after failed allocation */
43 #define ATUSB_TX_TIMEOUT_MS 200 /* on the air timeout */
44
45 struct atusb {
46 struct ieee802154_hw *hw;
47 struct usb_device *usb_dev;
48 int shutdown; /* non-zero if shutting down */
49 int err; /* set by first error */
50
51 /* RX variables */
52 struct delayed_work work; /* memory allocations */
53 struct usb_anchor idle_urbs; /* URBs waiting to be submitted */
54 struct usb_anchor rx_urbs; /* URBs waiting for reception */
55
56 /* TX variables */
57 struct usb_ctrlrequest tx_dr;
58 struct urb *tx_urb;
59 struct sk_buff *tx_skb;
60 uint8_t tx_ack_seq; /* current TX ACK sequence number */
61 };
62
63 /* ----- USB commands without data ----------------------------------------- */
64
65 /* To reduce the number of error checks in the code, we record the first error
66 * in atusb->err and reject all subsequent requests until the error is cleared.
67 */
68
69 static int atusb_control_msg(struct atusb *atusb, unsigned int pipe,
70 __u8 request, __u8 requesttype,
71 __u16 value, __u16 index,
72 void *data, __u16 size, int timeout)
73 {
74 struct usb_device *usb_dev = atusb->usb_dev;
75 int ret;
76
77 if (atusb->err)
78 return atusb->err;
79
80 ret = usb_control_msg(usb_dev, pipe, request, requesttype,
81 value, index, data, size, timeout);
82 if (ret < 0) {
83 atusb->err = ret;
84 dev_err(&usb_dev->dev,
85 "atusb_control_msg: req 0x%02x val 0x%x idx 0x%x, error %d\n",
86 request, value, index, ret);
87 }
88 return ret;
89 }
90
91 static int atusb_command(struct atusb *atusb, uint8_t cmd, uint8_t arg)
92 {
93 struct usb_device *usb_dev = atusb->usb_dev;
94
95 dev_dbg(&usb_dev->dev, "atusb_command: cmd = 0x%x\n", cmd);
96 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
97 cmd, ATUSB_REQ_TO_DEV, arg, 0, NULL, 0, 1000);
98 }
99
100 static int atusb_write_reg(struct atusb *atusb, uint8_t reg, uint8_t value)
101 {
102 struct usb_device *usb_dev = atusb->usb_dev;
103
104 dev_dbg(&usb_dev->dev, "atusb_write_reg: 0x%02x <- 0x%02x\n",
105 reg, value);
106 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
107 ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
108 value, reg, NULL, 0, 1000);
109 }
110
111 static int atusb_read_reg(struct atusb *atusb, uint8_t reg)
112 {
113 struct usb_device *usb_dev = atusb->usb_dev;
114 int ret;
115 uint8_t value;
116
117 dev_dbg(&usb_dev->dev, "atusb: reg = 0x%x\n", reg);
118 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
119 ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
120 0, reg, &value, 1, 1000);
121 return ret >= 0 ? value : ret;
122 }
123
124 static int atusb_write_subreg(struct atusb *atusb, uint8_t reg, uint8_t mask,
125 uint8_t shift, uint8_t value)
126 {
127 struct usb_device *usb_dev = atusb->usb_dev;
128 uint8_t orig, tmp;
129 int ret = 0;
130
131 dev_dbg(&usb_dev->dev, "atusb_write_subreg: 0x%02x <- 0x%02x\n",
132 reg, value);
133
134 orig = atusb_read_reg(atusb, reg);
135
136 /* Write the value only into that part of the register which is allowed
137 * by the mask. All other bits stay as before.
138 */
139 tmp = orig & ~mask;
140 tmp |= (value << shift) & mask;
141
142 if (tmp != orig)
143 ret = atusb_write_reg(atusb, reg, tmp);
144
145 return ret;
146 }
147
148 static int atusb_get_and_clear_error(struct atusb *atusb)
149 {
150 int err = atusb->err;
151
152 atusb->err = 0;
153 return err;
154 }
155
156 /* ----- skb allocation ---------------------------------------------------- */
157
158 #define MAX_PSDU 127
159 #define MAX_RX_XFER (1 + MAX_PSDU + 2 + 1) /* PHR+PSDU+CRC+LQI */
160
161 #define SKB_ATUSB(skb) (*(struct atusb **)(skb)->cb)
162
163 static void atusb_in(struct urb *urb);
164
165 static int atusb_submit_rx_urb(struct atusb *atusb, struct urb *urb)
166 {
167 struct usb_device *usb_dev = atusb->usb_dev;
168 struct sk_buff *skb = urb->context;
169 int ret;
170
171 if (!skb) {
172 skb = alloc_skb(MAX_RX_XFER, GFP_KERNEL);
173 if (!skb) {
174 dev_warn_ratelimited(&usb_dev->dev,
175 "atusb_in: can't allocate skb\n");
176 return -ENOMEM;
177 }
178 skb_put(skb, MAX_RX_XFER);
179 SKB_ATUSB(skb) = atusb;
180 }
181
182 usb_fill_bulk_urb(urb, usb_dev, usb_rcvbulkpipe(usb_dev, 1),
183 skb->data, MAX_RX_XFER, atusb_in, skb);
184 usb_anchor_urb(urb, &atusb->rx_urbs);
185
186 ret = usb_submit_urb(urb, GFP_KERNEL);
187 if (ret) {
188 usb_unanchor_urb(urb);
189 kfree_skb(skb);
190 urb->context = NULL;
191 }
192 return ret;
193 }
194
195 static void atusb_work_urbs(struct work_struct *work)
196 {
197 struct atusb *atusb =
198 container_of(to_delayed_work(work), struct atusb, work);
199 struct usb_device *usb_dev = atusb->usb_dev;
200 struct urb *urb;
201 int ret;
202
203 if (atusb->shutdown)
204 return;
205
206 do {
207 urb = usb_get_from_anchor(&atusb->idle_urbs);
208 if (!urb)
209 return;
210 ret = atusb_submit_rx_urb(atusb, urb);
211 } while (!ret);
212
213 usb_anchor_urb(urb, &atusb->idle_urbs);
214 dev_warn_ratelimited(&usb_dev->dev,
215 "atusb_in: can't allocate/submit URB (%d)\n", ret);
216 schedule_delayed_work(&atusb->work,
217 msecs_to_jiffies(ATUSB_ALLOC_DELAY_MS) + 1);
218 }
219
220 /* ----- Asynchronous USB -------------------------------------------------- */
221
222 static void atusb_tx_done(struct atusb *atusb, uint8_t seq)
223 {
224 struct usb_device *usb_dev = atusb->usb_dev;
225 uint8_t expect = atusb->tx_ack_seq;
226
227 dev_dbg(&usb_dev->dev, "atusb_tx_done (0x%02x/0x%02x)\n", seq, expect);
228 if (seq == expect) {
229 /* TODO check for ifs handling in firmware */
230 ieee802154_xmit_complete(atusb->hw, atusb->tx_skb, false);
231 } else {
232 /* TODO I experience this case when atusb has a tx complete
233 * irq before probing, we should fix the firmware it's an
234 * unlikely case now that seq == expect is then true, but can
235 * happen and fail with a tx_skb = NULL;
236 */
237 ieee802154_wake_queue(atusb->hw);
238 if (atusb->tx_skb)
239 dev_kfree_skb_irq(atusb->tx_skb);
240 }
241 }
242
243 static void atusb_in_good(struct urb *urb)
244 {
245 struct usb_device *usb_dev = urb->dev;
246 struct sk_buff *skb = urb->context;
247 struct atusb *atusb = SKB_ATUSB(skb);
248 uint8_t len, lqi;
249
250 if (!urb->actual_length) {
251 dev_dbg(&usb_dev->dev, "atusb_in: zero-sized URB ?\n");
252 return;
253 }
254
255 len = *skb->data;
256
257 if (urb->actual_length == 1) {
258 atusb_tx_done(atusb, len);
259 return;
260 }
261
262 if (len + 1 > urb->actual_length - 1) {
263 dev_dbg(&usb_dev->dev, "atusb_in: frame len %d+1 > URB %u-1\n",
264 len, urb->actual_length);
265 return;
266 }
267
268 if (!ieee802154_is_valid_psdu_len(len)) {
269 dev_dbg(&usb_dev->dev, "atusb_in: frame corrupted\n");
270 return;
271 }
272
273 lqi = skb->data[len + 1];
274 dev_dbg(&usb_dev->dev, "atusb_in: rx len %d lqi 0x%02x\n", len, lqi);
275 skb_pull(skb, 1); /* remove PHR */
276 skb_trim(skb, len); /* get payload only */
277 ieee802154_rx_irqsafe(atusb->hw, skb, lqi);
278 urb->context = NULL; /* skb is gone */
279 }
280
281 static void atusb_in(struct urb *urb)
282 {
283 struct usb_device *usb_dev = urb->dev;
284 struct sk_buff *skb = urb->context;
285 struct atusb *atusb = SKB_ATUSB(skb);
286
287 dev_dbg(&usb_dev->dev, "atusb_in: status %d len %d\n",
288 urb->status, urb->actual_length);
289 if (urb->status) {
290 if (urb->status == -ENOENT) { /* being killed */
291 kfree_skb(skb);
292 urb->context = NULL;
293 return;
294 }
295 dev_dbg(&usb_dev->dev, "atusb_in: URB error %d\n", urb->status);
296 } else {
297 atusb_in_good(urb);
298 }
299
300 usb_anchor_urb(urb, &atusb->idle_urbs);
301 if (!atusb->shutdown)
302 schedule_delayed_work(&atusb->work, 0);
303 }
304
305 /* ----- URB allocation/deallocation --------------------------------------- */
306
307 static void atusb_free_urbs(struct atusb *atusb)
308 {
309 struct urb *urb;
310
311 while (1) {
312 urb = usb_get_from_anchor(&atusb->idle_urbs);
313 if (!urb)
314 break;
315 kfree_skb(urb->context);
316 usb_free_urb(urb);
317 }
318 }
319
320 static int atusb_alloc_urbs(struct atusb *atusb, int n)
321 {
322 struct urb *urb;
323
324 while (n) {
325 urb = usb_alloc_urb(0, GFP_KERNEL);
326 if (!urb) {
327 atusb_free_urbs(atusb);
328 return -ENOMEM;
329 }
330 usb_anchor_urb(urb, &atusb->idle_urbs);
331 n--;
332 }
333 return 0;
334 }
335
336 /* ----- IEEE 802.15.4 interface operations -------------------------------- */
337
338 static void atusb_xmit_complete(struct urb *urb)
339 {
340 dev_dbg(&urb->dev->dev, "atusb_xmit urb completed");
341 }
342
343 static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
344 {
345 struct atusb *atusb = hw->priv;
346 struct usb_device *usb_dev = atusb->usb_dev;
347 int ret;
348
349 dev_dbg(&usb_dev->dev, "atusb_xmit (%d)\n", skb->len);
350 atusb->tx_skb = skb;
351 atusb->tx_ack_seq++;
352 atusb->tx_dr.wIndex = cpu_to_le16(atusb->tx_ack_seq);
353 atusb->tx_dr.wLength = cpu_to_le16(skb->len);
354
355 usb_fill_control_urb(atusb->tx_urb, usb_dev,
356 usb_sndctrlpipe(usb_dev, 0),
357 (unsigned char *)&atusb->tx_dr, skb->data,
358 skb->len, atusb_xmit_complete, NULL);
359 ret = usb_submit_urb(atusb->tx_urb, GFP_ATOMIC);
360 dev_dbg(&usb_dev->dev, "atusb_xmit done (%d)\n", ret);
361 return ret;
362 }
363
364 static int atusb_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
365 {
366 struct atusb *atusb = hw->priv;
367 int ret;
368
369 /* This implicitly sets the CCA (Clear Channel Assessment) mode to 0,
370 * "Mode 3a, Carrier sense OR energy above threshold".
371 * We should probably make this configurable. @@@
372 */
373 ret = atusb_write_reg(atusb, RG_PHY_CC_CCA, channel);
374 if (ret < 0)
375 return ret;
376 msleep(1); /* @@@ ugly synchronization */
377 return 0;
378 }
379
380 static int atusb_ed(struct ieee802154_hw *hw, u8 *level)
381 {
382 BUG_ON(!level);
383 *level = 0xbe;
384 return 0;
385 }
386
387 static int atusb_set_hw_addr_filt(struct ieee802154_hw *hw,
388 struct ieee802154_hw_addr_filt *filt,
389 unsigned long changed)
390 {
391 struct atusb *atusb = hw->priv;
392 struct device *dev = &atusb->usb_dev->dev;
393
394 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
395 u16 addr = le16_to_cpu(filt->short_addr);
396
397 dev_vdbg(dev, "atusb_set_hw_addr_filt called for saddr\n");
398 atusb_write_reg(atusb, RG_SHORT_ADDR_0, addr);
399 atusb_write_reg(atusb, RG_SHORT_ADDR_1, addr >> 8);
400 }
401
402 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
403 u16 pan = le16_to_cpu(filt->pan_id);
404
405 dev_vdbg(dev, "atusb_set_hw_addr_filt called for pan id\n");
406 atusb_write_reg(atusb, RG_PAN_ID_0, pan);
407 atusb_write_reg(atusb, RG_PAN_ID_1, pan >> 8);
408 }
409
410 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
411 u8 i, addr[IEEE802154_EXTENDED_ADDR_LEN];
412
413 memcpy(addr, &filt->ieee_addr, IEEE802154_EXTENDED_ADDR_LEN);
414 dev_vdbg(dev, "atusb_set_hw_addr_filt called for IEEE addr\n");
415 for (i = 0; i < 8; i++)
416 atusb_write_reg(atusb, RG_IEEE_ADDR_0 + i, addr[i]);
417 }
418
419 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
420 dev_vdbg(dev,
421 "atusb_set_hw_addr_filt called for panc change\n");
422 if (filt->pan_coord)
423 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1);
424 else
425 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0);
426 }
427
428 return atusb_get_and_clear_error(atusb);
429 }
430
431 static int atusb_start(struct ieee802154_hw *hw)
432 {
433 struct atusb *atusb = hw->priv;
434 struct usb_device *usb_dev = atusb->usb_dev;
435 int ret;
436
437 dev_dbg(&usb_dev->dev, "atusb_start\n");
438 schedule_delayed_work(&atusb->work, 0);
439 atusb_command(atusb, ATUSB_RX_MODE, 1);
440 ret = atusb_get_and_clear_error(atusb);
441 if (ret < 0)
442 usb_kill_anchored_urbs(&atusb->idle_urbs);
443 return ret;
444 }
445
446 static void atusb_stop(struct ieee802154_hw *hw)
447 {
448 struct atusb *atusb = hw->priv;
449 struct usb_device *usb_dev = atusb->usb_dev;
450
451 dev_dbg(&usb_dev->dev, "atusb_stop\n");
452 usb_kill_anchored_urbs(&atusb->idle_urbs);
453 atusb_command(atusb, ATUSB_RX_MODE, 0);
454 atusb_get_and_clear_error(atusb);
455 }
456
457 #define ATUSB_MAX_TX_POWERS 0xF
458 static const s32 atusb_powers[ATUSB_MAX_TX_POWERS + 1] = {
459 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
460 -900, -1200, -1700,
461 };
462
463 static int
464 atusb_set_txpower(struct ieee802154_hw *hw, s32 mbm)
465 {
466 struct atusb *atusb = hw->priv;
467 u32 i;
468
469 for (i = 0; i < hw->phy->supported.tx_powers_size; i++) {
470 if (hw->phy->supported.tx_powers[i] == mbm)
471 return atusb_write_subreg(atusb, SR_TX_PWR_23X, i);
472 }
473
474 return -EINVAL;
475 }
476
477 #define ATUSB_MAX_ED_LEVELS 0xF
478 static const s32 atusb_ed_levels[ATUSB_MAX_ED_LEVELS + 1] = {
479 -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
480 -7100, -6900, -6700, -6500, -6300, -6100,
481 };
482
483 static int
484 atusb_set_cca_mode(struct ieee802154_hw *hw, const struct wpan_phy_cca *cca)
485 {
486 struct atusb *atusb = hw->priv;
487 u8 val;
488
489 /* mapping 802.15.4 to driver spec */
490 switch (cca->mode) {
491 case NL802154_CCA_ENERGY:
492 val = 1;
493 break;
494 case NL802154_CCA_CARRIER:
495 val = 2;
496 break;
497 case NL802154_CCA_ENERGY_CARRIER:
498 switch (cca->opt) {
499 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
500 val = 3;
501 break;
502 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
503 val = 0;
504 break;
505 default:
506 return -EINVAL;
507 }
508 break;
509 default:
510 return -EINVAL;
511 }
512
513 return atusb_write_subreg(atusb, SR_CCA_MODE, val);
514 }
515
516 static int
517 atusb_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
518 {
519 struct atusb *atusb = hw->priv;
520 u32 i;
521
522 for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
523 if (hw->phy->supported.cca_ed_levels[i] == mbm)
524 return atusb_write_subreg(atusb, SR_CCA_ED_THRES, i);
525 }
526
527 return -EINVAL;
528 }
529
530 static int
531 atusb_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be, u8 retries)
532 {
533 struct atusb *atusb = hw->priv;
534 int ret;
535
536 ret = atusb_write_subreg(atusb, SR_MIN_BE, min_be);
537 if (ret)
538 return ret;
539
540 ret = atusb_write_subreg(atusb, SR_MAX_BE, max_be);
541 if (ret)
542 return ret;
543
544 return atusb_write_subreg(atusb, SR_MAX_CSMA_RETRIES, retries);
545 }
546
547 static int
548 atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
549 {
550 struct atusb *atusb = hw->priv;
551 int ret;
552
553 if (on) {
554 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1);
555 if (ret < 0)
556 return ret;
557
558 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1);
559 if (ret < 0)
560 return ret;
561 } else {
562 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0);
563 if (ret < 0)
564 return ret;
565
566 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0);
567 if (ret < 0)
568 return ret;
569 }
570
571 return 0;
572 }
573
574 static struct ieee802154_ops atusb_ops = {
575 .owner = THIS_MODULE,
576 .xmit_async = atusb_xmit,
577 .ed = atusb_ed,
578 .set_channel = atusb_channel,
579 .start = atusb_start,
580 .stop = atusb_stop,
581 .set_hw_addr_filt = atusb_set_hw_addr_filt,
582 .set_txpower = atusb_set_txpower,
583 .set_cca_mode = atusb_set_cca_mode,
584 .set_cca_ed_level = atusb_set_cca_ed_level,
585 .set_csma_params = atusb_set_csma_params,
586 .set_promiscuous_mode = atusb_set_promiscuous_mode,
587 };
588
589 /* ----- Firmware and chip version information ----------------------------- */
590
591 static int atusb_get_and_show_revision(struct atusb *atusb)
592 {
593 struct usb_device *usb_dev = atusb->usb_dev;
594 unsigned char buffer[3];
595 int ret;
596
597 /* Get a couple of the ATMega Firmware values */
598 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
599 ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0,
600 buffer, 3, 1000);
601 if (ret >= 0)
602 dev_info(&usb_dev->dev,
603 "Firmware: major: %u, minor: %u, hardware type: %u\n",
604 buffer[0], buffer[1], buffer[2]);
605 if (buffer[0] == 0 && buffer[1] < 2) {
606 dev_info(&usb_dev->dev,
607 "Firmware version (%u.%u) is predates our first public release.",
608 buffer[0], buffer[1]);
609 dev_info(&usb_dev->dev, "Please update to version 0.2 or newer");
610 }
611
612 return ret;
613 }
614
615 static int atusb_get_and_show_build(struct atusb *atusb)
616 {
617 struct usb_device *usb_dev = atusb->usb_dev;
618 char build[ATUSB_BUILD_SIZE + 1];
619 int ret;
620
621 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
622 ATUSB_BUILD, ATUSB_REQ_FROM_DEV, 0, 0,
623 build, ATUSB_BUILD_SIZE, 1000);
624 if (ret >= 0) {
625 build[ret] = 0;
626 dev_info(&usb_dev->dev, "Firmware: build %s\n", build);
627 }
628
629 return ret;
630 }
631
632 static int atusb_get_and_show_chip(struct atusb *atusb)
633 {
634 struct usb_device *usb_dev = atusb->usb_dev;
635 uint8_t man_id_0, man_id_1, part_num, version_num;
636 const char *chip;
637
638 man_id_0 = atusb_read_reg(atusb, RG_MAN_ID_0);
639 man_id_1 = atusb_read_reg(atusb, RG_MAN_ID_1);
640 part_num = atusb_read_reg(atusb, RG_PART_NUM);
641 version_num = atusb_read_reg(atusb, RG_VERSION_NUM);
642
643 if (atusb->err)
644 return atusb->err;
645
646 if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) {
647 dev_err(&usb_dev->dev,
648 "non-Atmel transceiver xxxx%02x%02x\n",
649 man_id_1, man_id_0);
650 goto fail;
651 }
652
653 switch (part_num) {
654 case 2:
655 chip = "AT86RF230";
656 break;
657 case 3:
658 chip = "AT86RF231";
659 break;
660 default:
661 dev_err(&usb_dev->dev,
662 "unexpected transceiver, part 0x%02x version 0x%02x\n",
663 part_num, version_num);
664 goto fail;
665 }
666
667 dev_info(&usb_dev->dev, "ATUSB: %s version %d\n", chip, version_num);
668
669 return 0;
670
671 fail:
672 atusb->err = -ENODEV;
673 return -ENODEV;
674 }
675
676 /* ----- Setup ------------------------------------------------------------- */
677
678 static int atusb_probe(struct usb_interface *interface,
679 const struct usb_device_id *id)
680 {
681 struct usb_device *usb_dev = interface_to_usbdev(interface);
682 struct ieee802154_hw *hw;
683 struct atusb *atusb = NULL;
684 int ret = -ENOMEM;
685
686 hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops);
687 if (!hw)
688 return -ENOMEM;
689
690 atusb = hw->priv;
691 atusb->hw = hw;
692 atusb->usb_dev = usb_get_dev(usb_dev);
693 usb_set_intfdata(interface, atusb);
694
695 atusb->shutdown = 0;
696 atusb->err = 0;
697 INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs);
698 init_usb_anchor(&atusb->idle_urbs);
699 init_usb_anchor(&atusb->rx_urbs);
700
701 if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS))
702 goto fail;
703
704 atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV;
705 atusb->tx_dr.bRequest = ATUSB_TX;
706 atusb->tx_dr.wValue = cpu_to_le16(0);
707
708 atusb->tx_urb = usb_alloc_urb(0, GFP_ATOMIC);
709 if (!atusb->tx_urb)
710 goto fail;
711
712 hw->parent = &usb_dev->dev;
713 hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
714 IEEE802154_HW_PROMISCUOUS | IEEE802154_HW_CSMA_PARAMS;
715
716 hw->phy->flags = WPAN_PHY_FLAG_TXPOWER | WPAN_PHY_FLAG_CCA_ED_LEVEL |
717 WPAN_PHY_FLAG_CCA_MODE;
718
719 hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
720 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
721 hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
722 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
723
724 hw->phy->supported.cca_ed_levels = atusb_ed_levels;
725 hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(atusb_ed_levels);
726
727 hw->phy->cca.mode = NL802154_CCA_ENERGY;
728
729 hw->phy->current_page = 0;
730 hw->phy->current_channel = 11; /* reset default */
731 hw->phy->supported.channels[0] = 0x7FFF800;
732 hw->phy->supported.tx_powers = atusb_powers;
733 hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
734 hw->phy->transmit_power = hw->phy->supported.tx_powers[0];
735 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
736 hw->phy->cca_ed_level = hw->phy->supported.cca_ed_levels[7];
737
738 atusb_command(atusb, ATUSB_RF_RESET, 0);
739 atusb_get_and_show_chip(atusb);
740 atusb_get_and_show_revision(atusb);
741 atusb_get_and_show_build(atusb);
742 ret = atusb_get_and_clear_error(atusb);
743 if (ret) {
744 dev_err(&atusb->usb_dev->dev,
745 "%s: initialization failed, error = %d\n",
746 __func__, ret);
747 goto fail;
748 }
749
750 ret = ieee802154_register_hw(hw);
751 if (ret)
752 goto fail;
753
754 /* If we just powered on, we're now in P_ON and need to enter TRX_OFF
755 * explicitly. Any resets after that will send us straight to TRX_OFF,
756 * making the command below redundant.
757 */
758 atusb_write_reg(atusb, RG_TRX_STATE, STATE_FORCE_TRX_OFF);
759 msleep(1); /* reset => TRX_OFF, tTR13 = 37 us */
760
761 #if 0
762 /* Calculating the maximum time available to empty the frame buffer
763 * on reception:
764 *
765 * According to [1], the inter-frame gap is
766 * R * 20 * 16 us + 128 us
767 * where R is a random number from 0 to 7. Furthermore, we have 20 bit
768 * times (80 us at 250 kbps) of SHR of the next frame before the
769 * transceiver begins storing data in the frame buffer.
770 *
771 * This yields a minimum time of 208 us between the last data of a
772 * frame and the first data of the next frame. This time is further
773 * reduced by interrupt latency in the atusb firmware.
774 *
775 * atusb currently needs about 500 us to retrieve a maximum-sized
776 * frame. We therefore have to allow reception of a new frame to begin
777 * while we retrieve the previous frame.
778 *
779 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based
780 * network", Jennic 2006.
781 * http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
782 */
783
784 atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1);
785 #endif
786 atusb_write_reg(atusb, RG_IRQ_MASK, 0xff);
787
788 ret = atusb_get_and_clear_error(atusb);
789 if (!ret)
790 return 0;
791
792 dev_err(&atusb->usb_dev->dev,
793 "%s: setup failed, error = %d\n",
794 __func__, ret);
795
796 ieee802154_unregister_hw(hw);
797 fail:
798 atusb_free_urbs(atusb);
799 usb_kill_urb(atusb->tx_urb);
800 usb_free_urb(atusb->tx_urb);
801 usb_put_dev(usb_dev);
802 ieee802154_free_hw(hw);
803 return ret;
804 }
805
806 static void atusb_disconnect(struct usb_interface *interface)
807 {
808 struct atusb *atusb = usb_get_intfdata(interface);
809
810 dev_dbg(&atusb->usb_dev->dev, "atusb_disconnect\n");
811
812 atusb->shutdown = 1;
813 cancel_delayed_work_sync(&atusb->work);
814
815 usb_kill_anchored_urbs(&atusb->rx_urbs);
816 atusb_free_urbs(atusb);
817 usb_kill_urb(atusb->tx_urb);
818 usb_free_urb(atusb->tx_urb);
819
820 ieee802154_unregister_hw(atusb->hw);
821
822 ieee802154_free_hw(atusb->hw);
823
824 usb_set_intfdata(interface, NULL);
825 usb_put_dev(atusb->usb_dev);
826
827 pr_debug("atusb_disconnect done\n");
828 }
829
830 /* The devices we work with */
831 static const struct usb_device_id atusb_device_table[] = {
832 {
833 .match_flags = USB_DEVICE_ID_MATCH_DEVICE |
834 USB_DEVICE_ID_MATCH_INT_INFO,
835 .idVendor = ATUSB_VENDOR_ID,
836 .idProduct = ATUSB_PRODUCT_ID,
837 .bInterfaceClass = USB_CLASS_VENDOR_SPEC
838 },
839 /* end with null element */
840 {}
841 };
842 MODULE_DEVICE_TABLE(usb, atusb_device_table);
843
844 static struct usb_driver atusb_driver = {
845 .name = "atusb",
846 .probe = atusb_probe,
847 .disconnect = atusb_disconnect,
848 .id_table = atusb_device_table,
849 };
850 module_usb_driver(atusb_driver);
851
852 MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>");
853 MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>");
854 MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>");
855 MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>");
856 MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver");
857 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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