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ieee802154: atusb: implement .set_cca_ed_level ops callback
[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 kfree_skb(urb->context);
314 usb_free_urb(urb);
315 }
316 }
317
318 static int atusb_alloc_urbs(struct atusb *atusb, int n)
319 {
320 struct urb *urb;
321
322 while (n) {
323 urb = usb_alloc_urb(0, GFP_KERNEL);
324 if (!urb) {
325 atusb_free_urbs(atusb);
326 return -ENOMEM;
327 }
328 usb_anchor_urb(urb, &atusb->idle_urbs);
329 n--;
330 }
331 return 0;
332 }
333
334 /* ----- IEEE 802.15.4 interface operations -------------------------------- */
335
336 static void atusb_xmit_complete(struct urb *urb)
337 {
338 dev_dbg(&urb->dev->dev, "atusb_xmit urb completed");
339 }
340
341 static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
342 {
343 struct atusb *atusb = hw->priv;
344 struct usb_device *usb_dev = atusb->usb_dev;
345 int ret;
346
347 dev_dbg(&usb_dev->dev, "atusb_xmit (%d)\n", skb->len);
348 atusb->tx_skb = skb;
349 atusb->tx_ack_seq++;
350 atusb->tx_dr.wIndex = cpu_to_le16(atusb->tx_ack_seq);
351 atusb->tx_dr.wLength = cpu_to_le16(skb->len);
352
353 usb_fill_control_urb(atusb->tx_urb, usb_dev,
354 usb_sndctrlpipe(usb_dev, 0),
355 (unsigned char *)&atusb->tx_dr, skb->data,
356 skb->len, atusb_xmit_complete, NULL);
357 ret = usb_submit_urb(atusb->tx_urb, GFP_ATOMIC);
358 dev_dbg(&usb_dev->dev, "atusb_xmit done (%d)\n", ret);
359 return ret;
360 }
361
362 static int atusb_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
363 {
364 struct atusb *atusb = hw->priv;
365 int ret;
366
367 /* This implicitly sets the CCA (Clear Channel Assessment) mode to 0,
368 * "Mode 3a, Carrier sense OR energy above threshold".
369 * We should probably make this configurable. @@@
370 */
371 ret = atusb_write_reg(atusb, RG_PHY_CC_CCA, channel);
372 if (ret < 0)
373 return ret;
374 msleep(1); /* @@@ ugly synchronization */
375 return 0;
376 }
377
378 static int atusb_ed(struct ieee802154_hw *hw, u8 *level)
379 {
380 BUG_ON(!level);
381 *level = 0xbe;
382 return 0;
383 }
384
385 static int atusb_set_hw_addr_filt(struct ieee802154_hw *hw,
386 struct ieee802154_hw_addr_filt *filt,
387 unsigned long changed)
388 {
389 struct atusb *atusb = hw->priv;
390 struct device *dev = &atusb->usb_dev->dev;
391
392 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
393 u16 addr = le16_to_cpu(filt->short_addr);
394
395 dev_vdbg(dev, "atusb_set_hw_addr_filt called for saddr\n");
396 atusb_write_reg(atusb, RG_SHORT_ADDR_0, addr);
397 atusb_write_reg(atusb, RG_SHORT_ADDR_1, addr >> 8);
398 }
399
400 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
401 u16 pan = le16_to_cpu(filt->pan_id);
402
403 dev_vdbg(dev, "atusb_set_hw_addr_filt called for pan id\n");
404 atusb_write_reg(atusb, RG_PAN_ID_0, pan);
405 atusb_write_reg(atusb, RG_PAN_ID_1, pan >> 8);
406 }
407
408 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
409 u8 i, addr[IEEE802154_EXTENDED_ADDR_LEN];
410
411 memcpy(addr, &filt->ieee_addr, IEEE802154_EXTENDED_ADDR_LEN);
412 dev_vdbg(dev, "atusb_set_hw_addr_filt called for IEEE addr\n");
413 for (i = 0; i < 8; i++)
414 atusb_write_reg(atusb, RG_IEEE_ADDR_0 + i, addr[i]);
415 }
416
417 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
418 dev_vdbg(dev,
419 "atusb_set_hw_addr_filt called for panc change\n");
420 if (filt->pan_coord)
421 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1);
422 else
423 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0);
424 }
425
426 return atusb_get_and_clear_error(atusb);
427 }
428
429 static int atusb_start(struct ieee802154_hw *hw)
430 {
431 struct atusb *atusb = hw->priv;
432 struct usb_device *usb_dev = atusb->usb_dev;
433 int ret;
434
435 dev_dbg(&usb_dev->dev, "atusb_start\n");
436 schedule_delayed_work(&atusb->work, 0);
437 atusb_command(atusb, ATUSB_RX_MODE, 1);
438 ret = atusb_get_and_clear_error(atusb);
439 if (ret < 0)
440 usb_kill_anchored_urbs(&atusb->idle_urbs);
441 return ret;
442 }
443
444 static void atusb_stop(struct ieee802154_hw *hw)
445 {
446 struct atusb *atusb = hw->priv;
447 struct usb_device *usb_dev = atusb->usb_dev;
448
449 dev_dbg(&usb_dev->dev, "atusb_stop\n");
450 usb_kill_anchored_urbs(&atusb->idle_urbs);
451 atusb_command(atusb, ATUSB_RX_MODE, 0);
452 atusb_get_and_clear_error(atusb);
453 }
454
455 #define ATUSB_MAX_TX_POWERS 0xF
456 static const s32 atusb_powers[ATUSB_MAX_TX_POWERS + 1] = {
457 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
458 -900, -1200, -1700,
459 };
460
461 static int
462 atusb_set_txpower(struct ieee802154_hw *hw, s32 mbm)
463 {
464 struct atusb *atusb = hw->priv;
465 u32 i;
466
467 for (i = 0; i < hw->phy->supported.tx_powers_size; i++) {
468 if (hw->phy->supported.tx_powers[i] == mbm)
469 return atusb_write_subreg(atusb, SR_TX_PWR_23X, i);
470 }
471
472 return -EINVAL;
473 }
474
475 #define ATUSB_MAX_ED_LEVELS 0xF
476 static const s32 atusb_ed_levels[ATUSB_MAX_ED_LEVELS + 1] = {
477 -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
478 -7100, -6900, -6700, -6500, -6300, -6100,
479 };
480
481 static int
482 atusb_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
483 {
484 struct atusb *atusb = hw->priv;
485 u32 i;
486
487 for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
488 if (hw->phy->supported.cca_ed_levels[i] == mbm)
489 return atusb_write_subreg(atusb, SR_CCA_ED_THRES, i);
490 }
491
492 return -EINVAL;
493 }
494
495 static int
496 atusb_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be, u8 retries)
497 {
498 struct atusb *atusb = hw->priv;
499 int ret;
500
501 ret = atusb_write_subreg(atusb, SR_MIN_BE, min_be);
502 if (ret)
503 return ret;
504
505 ret = atusb_write_subreg(atusb, SR_MAX_BE, max_be);
506 if (ret)
507 return ret;
508
509 return atusb_write_subreg(atusb, SR_MAX_CSMA_RETRIES, retries);
510 }
511
512 static int
513 atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
514 {
515 struct atusb *atusb = hw->priv;
516 int ret;
517
518 if (on) {
519 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1);
520 if (ret < 0)
521 return ret;
522
523 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1);
524 if (ret < 0)
525 return ret;
526 } else {
527 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0);
528 if (ret < 0)
529 return ret;
530
531 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0);
532 if (ret < 0)
533 return ret;
534 }
535
536 return 0;
537 }
538
539 static struct ieee802154_ops atusb_ops = {
540 .owner = THIS_MODULE,
541 .xmit_async = atusb_xmit,
542 .ed = atusb_ed,
543 .set_channel = atusb_channel,
544 .start = atusb_start,
545 .stop = atusb_stop,
546 .set_hw_addr_filt = atusb_set_hw_addr_filt,
547 .set_txpower = atusb_set_txpower,
548 .set_cca_ed_level = atusb_set_cca_ed_level,
549 .set_csma_params = atusb_set_csma_params,
550 .set_promiscuous_mode = atusb_set_promiscuous_mode,
551 };
552
553 /* ----- Firmware and chip version information ----------------------------- */
554
555 static int atusb_get_and_show_revision(struct atusb *atusb)
556 {
557 struct usb_device *usb_dev = atusb->usb_dev;
558 unsigned char buffer[3];
559 int ret;
560
561 /* Get a couple of the ATMega Firmware values */
562 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
563 ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0,
564 buffer, 3, 1000);
565 if (ret >= 0)
566 dev_info(&usb_dev->dev,
567 "Firmware: major: %u, minor: %u, hardware type: %u\n",
568 buffer[0], buffer[1], buffer[2]);
569 if (buffer[0] == 0 && buffer[1] < 2) {
570 dev_info(&usb_dev->dev,
571 "Firmware version (%u.%u) is predates our first public release.",
572 buffer[0], buffer[1]);
573 dev_info(&usb_dev->dev, "Please update to version 0.2 or newer");
574 }
575
576 return ret;
577 }
578
579 static int atusb_get_and_show_build(struct atusb *atusb)
580 {
581 struct usb_device *usb_dev = atusb->usb_dev;
582 char build[ATUSB_BUILD_SIZE + 1];
583 int ret;
584
585 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
586 ATUSB_BUILD, ATUSB_REQ_FROM_DEV, 0, 0,
587 build, ATUSB_BUILD_SIZE, 1000);
588 if (ret >= 0) {
589 build[ret] = 0;
590 dev_info(&usb_dev->dev, "Firmware: build %s\n", build);
591 }
592
593 return ret;
594 }
595
596 static int atusb_get_and_show_chip(struct atusb *atusb)
597 {
598 struct usb_device *usb_dev = atusb->usb_dev;
599 uint8_t man_id_0, man_id_1, part_num, version_num;
600 const char *chip;
601
602 man_id_0 = atusb_read_reg(atusb, RG_MAN_ID_0);
603 man_id_1 = atusb_read_reg(atusb, RG_MAN_ID_1);
604 part_num = atusb_read_reg(atusb, RG_PART_NUM);
605 version_num = atusb_read_reg(atusb, RG_VERSION_NUM);
606
607 if (atusb->err)
608 return atusb->err;
609
610 if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) {
611 dev_err(&usb_dev->dev,
612 "non-Atmel transceiver xxxx%02x%02x\n",
613 man_id_1, man_id_0);
614 goto fail;
615 }
616
617 switch (part_num) {
618 case 2:
619 chip = "AT86RF230";
620 break;
621 case 3:
622 chip = "AT86RF231";
623 break;
624 default:
625 dev_err(&usb_dev->dev,
626 "unexpected transceiver, part 0x%02x version 0x%02x\n",
627 part_num, version_num);
628 goto fail;
629 }
630
631 dev_info(&usb_dev->dev, "ATUSB: %s version %d\n", chip, version_num);
632
633 return 0;
634
635 fail:
636 atusb->err = -ENODEV;
637 return -ENODEV;
638 }
639
640 /* ----- Setup ------------------------------------------------------------- */
641
642 static int atusb_probe(struct usb_interface *interface,
643 const struct usb_device_id *id)
644 {
645 struct usb_device *usb_dev = interface_to_usbdev(interface);
646 struct ieee802154_hw *hw;
647 struct atusb *atusb = NULL;
648 int ret = -ENOMEM;
649
650 hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops);
651 if (!hw)
652 return -ENOMEM;
653
654 atusb = hw->priv;
655 atusb->hw = hw;
656 atusb->usb_dev = usb_get_dev(usb_dev);
657 usb_set_intfdata(interface, atusb);
658
659 atusb->shutdown = 0;
660 atusb->err = 0;
661 INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs);
662 init_usb_anchor(&atusb->idle_urbs);
663 init_usb_anchor(&atusb->rx_urbs);
664
665 if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS))
666 goto fail;
667
668 atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV;
669 atusb->tx_dr.bRequest = ATUSB_TX;
670 atusb->tx_dr.wValue = cpu_to_le16(0);
671
672 atusb->tx_urb = usb_alloc_urb(0, GFP_ATOMIC);
673 if (!atusb->tx_urb)
674 goto fail;
675
676 hw->parent = &usb_dev->dev;
677 hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
678 IEEE802154_HW_PROMISCUOUS | IEEE802154_HW_CSMA_PARAMS;
679
680 hw->phy->flags = WPAN_PHY_FLAG_TXPOWER | WPAN_PHY_FLAG_CCA_ED_LEVEL;
681
682 hw->phy->supported.cca_ed_levels = atusb_ed_levels;
683 hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(atusb_ed_levels);
684
685 hw->phy->current_page = 0;
686 hw->phy->current_channel = 11; /* reset default */
687 hw->phy->supported.channels[0] = 0x7FFF800;
688 hw->phy->supported.tx_powers = atusb_powers;
689 hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
690 hw->phy->transmit_power = hw->phy->supported.tx_powers[0];
691 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
692 hw->phy->cca_ed_level = hw->phy->supported.cca_ed_levels[7];
693
694 atusb_command(atusb, ATUSB_RF_RESET, 0);
695 atusb_get_and_show_chip(atusb);
696 atusb_get_and_show_revision(atusb);
697 atusb_get_and_show_build(atusb);
698 ret = atusb_get_and_clear_error(atusb);
699 if (ret) {
700 dev_err(&atusb->usb_dev->dev,
701 "%s: initialization failed, error = %d\n",
702 __func__, ret);
703 goto fail;
704 }
705
706 ret = ieee802154_register_hw(hw);
707 if (ret)
708 goto fail;
709
710 /* If we just powered on, we're now in P_ON and need to enter TRX_OFF
711 * explicitly. Any resets after that will send us straight to TRX_OFF,
712 * making the command below redundant.
713 */
714 atusb_write_reg(atusb, RG_TRX_STATE, STATE_FORCE_TRX_OFF);
715 msleep(1); /* reset => TRX_OFF, tTR13 = 37 us */
716
717 #if 0
718 /* Calculating the maximum time available to empty the frame buffer
719 * on reception:
720 *
721 * According to [1], the inter-frame gap is
722 * R * 20 * 16 us + 128 us
723 * where R is a random number from 0 to 7. Furthermore, we have 20 bit
724 * times (80 us at 250 kbps) of SHR of the next frame before the
725 * transceiver begins storing data in the frame buffer.
726 *
727 * This yields a minimum time of 208 us between the last data of a
728 * frame and the first data of the next frame. This time is further
729 * reduced by interrupt latency in the atusb firmware.
730 *
731 * atusb currently needs about 500 us to retrieve a maximum-sized
732 * frame. We therefore have to allow reception of a new frame to begin
733 * while we retrieve the previous frame.
734 *
735 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based
736 * network", Jennic 2006.
737 * http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
738 */
739
740 atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1);
741 #endif
742 atusb_write_reg(atusb, RG_IRQ_MASK, 0xff);
743
744 ret = atusb_get_and_clear_error(atusb);
745 if (!ret)
746 return 0;
747
748 dev_err(&atusb->usb_dev->dev,
749 "%s: setup failed, error = %d\n",
750 __func__, ret);
751
752 ieee802154_unregister_hw(hw);
753 fail:
754 atusb_free_urbs(atusb);
755 usb_kill_urb(atusb->tx_urb);
756 usb_free_urb(atusb->tx_urb);
757 usb_put_dev(usb_dev);
758 ieee802154_free_hw(hw);
759 return ret;
760 }
761
762 static void atusb_disconnect(struct usb_interface *interface)
763 {
764 struct atusb *atusb = usb_get_intfdata(interface);
765
766 dev_dbg(&atusb->usb_dev->dev, "atusb_disconnect\n");
767
768 atusb->shutdown = 1;
769 cancel_delayed_work_sync(&atusb->work);
770
771 usb_kill_anchored_urbs(&atusb->rx_urbs);
772 atusb_free_urbs(atusb);
773 usb_kill_urb(atusb->tx_urb);
774 usb_free_urb(atusb->tx_urb);
775
776 ieee802154_unregister_hw(atusb->hw);
777
778 ieee802154_free_hw(atusb->hw);
779
780 usb_set_intfdata(interface, NULL);
781 usb_put_dev(atusb->usb_dev);
782
783 pr_debug("atusb_disconnect done\n");
784 }
785
786 /* The devices we work with */
787 static const struct usb_device_id atusb_device_table[] = {
788 {
789 .match_flags = USB_DEVICE_ID_MATCH_DEVICE |
790 USB_DEVICE_ID_MATCH_INT_INFO,
791 .idVendor = ATUSB_VENDOR_ID,
792 .idProduct = ATUSB_PRODUCT_ID,
793 .bInterfaceClass = USB_CLASS_VENDOR_SPEC
794 },
795 /* end with null element */
796 {}
797 };
798 MODULE_DEVICE_TABLE(usb, atusb_device_table);
799
800 static struct usb_driver atusb_driver = {
801 .name = "atusb",
802 .probe = atusb_probe,
803 .disconnect = atusb_disconnect,
804 .id_table = atusb_device_table,
805 };
806 module_usb_driver(atusb_driver);
807
808 MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>");
809 MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>");
810 MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>");
811 MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>");
812 MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver");
813 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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