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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / drivers / net / ieee802154 / atusb.c
blobb1cd865ade2e051fe7bea84b552bca086e8f4fef
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 static int
476 atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
477 {
478 struct atusb *atusb = hw->priv;
479 int ret;
480
481 if (on) {
482 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1);
483 if (ret < 0)
484 return ret;
485
486 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1);
487 if (ret < 0)
488 return ret;
489 } else {
490 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0);
491 if (ret < 0)
492 return ret;
493
494 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0);
495 if (ret < 0)
496 return ret;
497 }
498
499 return 0;
500 }
501
502 static struct ieee802154_ops atusb_ops = {
503 .owner = THIS_MODULE,
504 .xmit_async = atusb_xmit,
505 .ed = atusb_ed,
506 .set_channel = atusb_channel,
507 .start = atusb_start,
508 .stop = atusb_stop,
509 .set_hw_addr_filt = atusb_set_hw_addr_filt,
510 .set_txpower = atusb_set_txpower,
511 .set_promiscuous_mode = atusb_set_promiscuous_mode,
512 };
513
514 /* ----- Firmware and chip version information ----------------------------- */
515
516 static int atusb_get_and_show_revision(struct atusb *atusb)
517 {
518 struct usb_device *usb_dev = atusb->usb_dev;
519 unsigned char buffer[3];
520 int ret;
521
522 /* Get a couple of the ATMega Firmware values */
523 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
524 ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0,
525 buffer, 3, 1000);
526 if (ret >= 0)
527 dev_info(&usb_dev->dev,
528 "Firmware: major: %u, minor: %u, hardware type: %u\n",
529 buffer[0], buffer[1], buffer[2]);
530 if (buffer[0] == 0 && buffer[1] < 2) {
531 dev_info(&usb_dev->dev,
532 "Firmware version (%u.%u) is predates our first public release.",
533 buffer[0], buffer[1]);
534 dev_info(&usb_dev->dev, "Please update to version 0.2 or newer");
535 }
536
537 return ret;
538 }
539
540 static int atusb_get_and_show_build(struct atusb *atusb)
541 {
542 struct usb_device *usb_dev = atusb->usb_dev;
543 char build[ATUSB_BUILD_SIZE + 1];
544 int ret;
545
546 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
547 ATUSB_BUILD, ATUSB_REQ_FROM_DEV, 0, 0,
548 build, ATUSB_BUILD_SIZE, 1000);
549 if (ret >= 0) {
550 build[ret] = 0;
551 dev_info(&usb_dev->dev, "Firmware: build %s\n", build);
552 }
553
554 return ret;
555 }
556
557 static int atusb_get_and_show_chip(struct atusb *atusb)
558 {
559 struct usb_device *usb_dev = atusb->usb_dev;
560 uint8_t man_id_0, man_id_1, part_num, version_num;
561 const char *chip;
562
563 man_id_0 = atusb_read_reg(atusb, RG_MAN_ID_0);
564 man_id_1 = atusb_read_reg(atusb, RG_MAN_ID_1);
565 part_num = atusb_read_reg(atusb, RG_PART_NUM);
566 version_num = atusb_read_reg(atusb, RG_VERSION_NUM);
567
568 if (atusb->err)
569 return atusb->err;
570
571 if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) {
572 dev_err(&usb_dev->dev,
573 "non-Atmel transceiver xxxx%02x%02x\n",
574 man_id_1, man_id_0);
575 goto fail;
576 }
577
578 switch (part_num) {
579 case 2:
580 chip = "AT86RF230";
581 break;
582 case 3:
583 chip = "AT86RF231";
584 break;
585 default:
586 dev_err(&usb_dev->dev,
587 "unexpected transceiver, part 0x%02x version 0x%02x\n",
588 part_num, version_num);
589 goto fail;
590 }
591
592 dev_info(&usb_dev->dev, "ATUSB: %s version %d\n", chip, version_num);
593
594 return 0;
595
596 fail:
597 atusb->err = -ENODEV;
598 return -ENODEV;
599 }
600
601 /* ----- Setup ------------------------------------------------------------- */
602
603 static int atusb_probe(struct usb_interface *interface,
604 const struct usb_device_id *id)
605 {
606 struct usb_device *usb_dev = interface_to_usbdev(interface);
607 struct ieee802154_hw *hw;
608 struct atusb *atusb = NULL;
609 int ret = -ENOMEM;
610
611 hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops);
612 if (!hw)
613 return -ENOMEM;
614
615 atusb = hw->priv;
616 atusb->hw = hw;
617 atusb->usb_dev = usb_get_dev(usb_dev);
618 usb_set_intfdata(interface, atusb);
619
620 atusb->shutdown = 0;
621 atusb->err = 0;
622 INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs);
623 init_usb_anchor(&atusb->idle_urbs);
624 init_usb_anchor(&atusb->rx_urbs);
625
626 if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS))
627 goto fail;
628
629 atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV;
630 atusb->tx_dr.bRequest = ATUSB_TX;
631 atusb->tx_dr.wValue = cpu_to_le16(0);
632
633 atusb->tx_urb = usb_alloc_urb(0, GFP_ATOMIC);
634 if (!atusb->tx_urb)
635 goto fail;
636
637 hw->parent = &usb_dev->dev;
638 hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
639 IEEE802154_HW_PROMISCUOUS;
640
641 hw->phy->flags = WPAN_PHY_FLAG_TXPOWER;
642
643 hw->phy->current_page = 0;
644 hw->phy->current_channel = 11; /* reset default */
645 hw->phy->supported.channels[0] = 0x7FFF800;
646 hw->phy->supported.tx_powers = atusb_powers;
647 hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
648 hw->phy->transmit_power = hw->phy->supported.tx_powers[0];
649 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
650
651 atusb_command(atusb, ATUSB_RF_RESET, 0);
652 atusb_get_and_show_chip(atusb);
653 atusb_get_and_show_revision(atusb);
654 atusb_get_and_show_build(atusb);
655 ret = atusb_get_and_clear_error(atusb);
656 if (ret) {
657 dev_err(&atusb->usb_dev->dev,
658 "%s: initialization failed, error = %d\n",
659 __func__, ret);
660 goto fail;
661 }
662
663 ret = ieee802154_register_hw(hw);
664 if (ret)
665 goto fail;
666
667 /* If we just powered on, we're now in P_ON and need to enter TRX_OFF
668 * explicitly. Any resets after that will send us straight to TRX_OFF,
669 * making the command below redundant.
670 */
671 atusb_write_reg(atusb, RG_TRX_STATE, STATE_FORCE_TRX_OFF);
672 msleep(1); /* reset => TRX_OFF, tTR13 = 37 us */
673
674 #if 0
675 /* Calculating the maximum time available to empty the frame buffer
676 * on reception:
677 *
678 * According to [1], the inter-frame gap is
679 * R * 20 * 16 us + 128 us
680 * where R is a random number from 0 to 7. Furthermore, we have 20 bit
681 * times (80 us at 250 kbps) of SHR of the next frame before the
682 * transceiver begins storing data in the frame buffer.
683 *
684 * This yields a minimum time of 208 us between the last data of a
685 * frame and the first data of the next frame. This time is further
686 * reduced by interrupt latency in the atusb firmware.
687 *
688 * atusb currently needs about 500 us to retrieve a maximum-sized
689 * frame. We therefore have to allow reception of a new frame to begin
690 * while we retrieve the previous frame.
691 *
692 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based
693 * network", Jennic 2006.
694 * http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
695 */
696
697 atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1);
698 #endif
699 atusb_write_reg(atusb, RG_IRQ_MASK, 0xff);
700
701 ret = atusb_get_and_clear_error(atusb);
702 if (!ret)
703 return 0;
704
705 dev_err(&atusb->usb_dev->dev,
706 "%s: setup failed, error = %d\n",
707 __func__, ret);
708
709 ieee802154_unregister_hw(hw);
710 fail:
711 atusb_free_urbs(atusb);
712 usb_kill_urb(atusb->tx_urb);
713 usb_free_urb(atusb->tx_urb);
714 usb_put_dev(usb_dev);
715 ieee802154_free_hw(hw);
716 return ret;
717 }
718
719 static void atusb_disconnect(struct usb_interface *interface)
720 {
721 struct atusb *atusb = usb_get_intfdata(interface);
722
723 dev_dbg(&atusb->usb_dev->dev, "atusb_disconnect\n");
724
725 atusb->shutdown = 1;
726 cancel_delayed_work_sync(&atusb->work);
727
728 usb_kill_anchored_urbs(&atusb->rx_urbs);
729 atusb_free_urbs(atusb);
730 usb_kill_urb(atusb->tx_urb);
731 usb_free_urb(atusb->tx_urb);
732
733 ieee802154_unregister_hw(atusb->hw);
734
735 ieee802154_free_hw(atusb->hw);
736
737 usb_set_intfdata(interface, NULL);
738 usb_put_dev(atusb->usb_dev);
739
740 pr_debug("atusb_disconnect done\n");
741 }
742
743 /* The devices we work with */
744 static const struct usb_device_id atusb_device_table[] = {
745 {
746 .match_flags = USB_DEVICE_ID_MATCH_DEVICE |
747 USB_DEVICE_ID_MATCH_INT_INFO,
748 .idVendor = ATUSB_VENDOR_ID,
749 .idProduct = ATUSB_PRODUCT_ID,
750 .bInterfaceClass = USB_CLASS_VENDOR_SPEC
751 },
752 /* end with null element */
753 {}
754 };
755 MODULE_DEVICE_TABLE(usb, atusb_device_table);
756
757 static struct usb_driver atusb_driver = {
758 .name = "atusb",
759 .probe = atusb_probe,
760 .disconnect = atusb_disconnect,
761 .id_table = atusb_device_table,
762 };
763 module_usb_driver(atusb_driver);
764
765 MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>");
766 MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>");
767 MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>");
768 MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>");
769 MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver");
770 MODULE_LICENSE("GPL");
CRIS linux kernel tree