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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * atusb.c - Driver for the ATUSB IEEE 802.15.4 dongle
4 *
5 * Written 2013 by Werner Almesberger <werner@almesberger.net>
6 *
7 * Copyright (c) 2015 - 2016 Stefan Schmidt <stefan@datenfreihafen.org>
8 *
9 * Based on at86rf230.c and spi_atusb.c.
10 * at86rf230.c is
11 * Copyright (C) 2009 Siemens AG
12 * Written by: Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com>
13 *
14 * spi_atusb.c is
15 * Copyright (c) 2011 Richard Sharpe <realrichardsharpe@gmail.com>
16 * Copyright (c) 2011 Stefan Schmidt <stefan@datenfreihafen.org>
17 * Copyright (c) 2011 Werner Almesberger <werner@almesberger.net>
18 *
19 * USB initialization is
20 * Copyright (c) 2013 Alexander Aring <alex.aring@gmail.com>
21 *
22 * Busware HUL support is
23 * Copyright (c) 2017 Josef Filzmaier <j.filzmaier@gmx.at>
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
45struct atusb {
46 struct ieee802154_hw *hw;
47 struct usb_device *usb_dev;
48 struct atusb_chip_data *data;
49 int shutdown; /* non-zero if shutting down */
50 int err; /* set by first error */
51
52 /* RX variables */
53 struct delayed_work work; /* memory allocations */
54 struct usb_anchor idle_urbs; /* URBs waiting to be submitted */
55 struct usb_anchor rx_urbs; /* URBs waiting for reception */
56
57 /* TX variables */
58 struct usb_ctrlrequest tx_dr;
59 struct urb *tx_urb;
60 struct sk_buff *tx_skb;
61 u8 tx_ack_seq; /* current TX ACK sequence number */
62
63 /* Firmware variable */
64 unsigned char fw_ver_maj; /* Firmware major version number */
65 unsigned char fw_ver_min; /* Firmware minor version number */
66 unsigned char fw_hw_type; /* Firmware hardware type */
67};
68
69struct atusb_chip_data {
70 u16 t_channel_switch;
71 int rssi_base_val;
72
73 int (*set_channel)(struct ieee802154_hw*, u8, u8);
74 int (*set_txpower)(struct ieee802154_hw*, s32);
75};
76
77/* ----- USB commands without data ----------------------------------------- */
78
79/* To reduce the number of error checks in the code, we record the first error
80 * in atusb->err and reject all subsequent requests until the error is cleared.
81 */
82
83static int atusb_control_msg(struct atusb *atusb, unsigned int pipe,
84 __u8 request, __u8 requesttype,
85 __u16 value, __u16 index,
86 void *data, __u16 size, int timeout)
87{
88 struct usb_device *usb_dev = atusb->usb_dev;
89 int ret;
90
91 if (atusb->err)
92 return atusb->err;
93
94 ret = usb_control_msg(usb_dev, pipe, request, requesttype,
95 value, index, data, size, timeout);
96 if (ret < 0) {
97 atusb->err = ret;
98 dev_err(&usb_dev->dev,
99 "%s: req 0x%02x val 0x%x idx 0x%x, error %d\n",
100 __func__, request, value, index, ret);
101 }
102 return ret;
103}
104
105static int atusb_command(struct atusb *atusb, u8 cmd, u8 arg)
106{
107 struct usb_device *usb_dev = atusb->usb_dev;
108
109 dev_dbg(&usb_dev->dev, "%s: cmd = 0x%x\n", __func__, cmd);
110 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
111 cmd, ATUSB_REQ_TO_DEV, arg, 0, NULL, 0, 1000);
112}
113
114static int atusb_write_reg(struct atusb *atusb, u8 reg, u8 value)
115{
116 struct usb_device *usb_dev = atusb->usb_dev;
117
118 dev_dbg(&usb_dev->dev, "%s: 0x%02x <- 0x%02x\n", __func__, reg, value);
119 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
120 ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
121 value, reg, NULL, 0, 1000);
122}
123
124static int atusb_read_reg(struct atusb *atusb, u8 reg)
125{
126 struct usb_device *usb_dev = atusb->usb_dev;
127 int ret;
128 u8 *buffer;
129 u8 value;
130
131 buffer = kmalloc(1, GFP_KERNEL);
132 if (!buffer)
133 return -ENOMEM;
134
135 dev_dbg(&usb_dev->dev, "%s: reg = 0x%x\n", __func__, reg);
136 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
137 ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
138 0, reg, buffer, 1, 1000);
139
140 if (ret >= 0) {
141 value = buffer[0];
142 kfree(buffer);
143 return value;
144 } else {
145 kfree(buffer);
146 return ret;
147 }
148}
149
150static int atusb_write_subreg(struct atusb *atusb, u8 reg, u8 mask,
151 u8 shift, u8 value)
152{
153 struct usb_device *usb_dev = atusb->usb_dev;
154 u8 orig, tmp;
155 int ret = 0;
156
157 dev_dbg(&usb_dev->dev, "%s: 0x%02x <- 0x%02x\n", __func__, reg, value);
158
159 orig = atusb_read_reg(atusb, reg);
160
161 /* Write the value only into that part of the register which is allowed
162 * by the mask. All other bits stay as before.
163 */
164 tmp = orig & ~mask;
165 tmp |= (value << shift) & mask;
166
167 if (tmp != orig)
168 ret = atusb_write_reg(atusb, reg, tmp);
169
170 return ret;
171}
172
173static int atusb_read_subreg(struct atusb *lp,
174 unsigned int addr, unsigned int mask,
175 unsigned int shift)
176{
177 int rc;
178
179 rc = atusb_read_reg(lp, addr);
180 rc = (rc & mask) >> shift;
181
182 return rc;
183}
184
185static int atusb_get_and_clear_error(struct atusb *atusb)
186{
187 int err = atusb->err;
188
189 atusb->err = 0;
190 return err;
191}
192
193/* ----- skb allocation ---------------------------------------------------- */
194
195#define MAX_PSDU 127
196#define MAX_RX_XFER (1 + MAX_PSDU + 2 + 1) /* PHR+PSDU+CRC+LQI */
197
198#define SKB_ATUSB(skb) (*(struct atusb **)(skb)->cb)
199
200static void atusb_in(struct urb *urb);
201
202static int atusb_submit_rx_urb(struct atusb *atusb, struct urb *urb)
203{
204 struct usb_device *usb_dev = atusb->usb_dev;
205 struct sk_buff *skb = urb->context;
206 int ret;
207
208 if (!skb) {
209 skb = alloc_skb(MAX_RX_XFER, GFP_KERNEL);
210 if (!skb) {
211 dev_warn_ratelimited(&usb_dev->dev,
212 "atusb_in: can't allocate skb\n");
213 return -ENOMEM;
214 }
215 skb_put(skb, MAX_RX_XFER);
216 SKB_ATUSB(skb) = atusb;
217 }
218
219 usb_fill_bulk_urb(urb, usb_dev, usb_rcvbulkpipe(usb_dev, 1),
220 skb->data, MAX_RX_XFER, atusb_in, skb);
221 usb_anchor_urb(urb, &atusb->rx_urbs);
222
223 ret = usb_submit_urb(urb, GFP_KERNEL);
224 if (ret) {
225 usb_unanchor_urb(urb);
226 kfree_skb(skb);
227 urb->context = NULL;
228 }
229 return ret;
230}
231
232static void atusb_work_urbs(struct work_struct *work)
233{
234 struct atusb *atusb =
235 container_of(to_delayed_work(work), struct atusb, work);
236 struct usb_device *usb_dev = atusb->usb_dev;
237 struct urb *urb;
238 int ret;
239
240 if (atusb->shutdown)
241 return;
242
243 do {
244 urb = usb_get_from_anchor(&atusb->idle_urbs);
245 if (!urb)
246 return;
247 ret = atusb_submit_rx_urb(atusb, urb);
248 } while (!ret);
249
250 usb_anchor_urb(urb, &atusb->idle_urbs);
251 dev_warn_ratelimited(&usb_dev->dev,
252 "atusb_in: can't allocate/submit URB (%d)\n", ret);
253 schedule_delayed_work(&atusb->work,
254 msecs_to_jiffies(ATUSB_ALLOC_DELAY_MS) + 1);
255}
256
257/* ----- Asynchronous USB -------------------------------------------------- */
258
259static void atusb_tx_done(struct atusb *atusb, u8 seq)
260{
261 struct usb_device *usb_dev = atusb->usb_dev;
262 u8 expect = atusb->tx_ack_seq;
263
264 dev_dbg(&usb_dev->dev, "%s (0x%02x/0x%02x)\n", __func__, seq, expect);
265 if (seq == expect) {
266 /* TODO check for ifs handling in firmware */
267 ieee802154_xmit_complete(atusb->hw, atusb->tx_skb, false);
268 } else {
269 /* TODO I experience this case when atusb has a tx complete
270 * irq before probing, we should fix the firmware it's an
271 * unlikely case now that seq == expect is then true, but can
272 * happen and fail with a tx_skb = NULL;
273 */
274 ieee802154_wake_queue(atusb->hw);
275 if (atusb->tx_skb)
276 dev_kfree_skb_irq(atusb->tx_skb);
277 }
278}
279
280static void atusb_in_good(struct urb *urb)
281{
282 struct usb_device *usb_dev = urb->dev;
283 struct sk_buff *skb = urb->context;
284 struct atusb *atusb = SKB_ATUSB(skb);
285 u8 len, lqi;
286
287 if (!urb->actual_length) {
288 dev_dbg(&usb_dev->dev, "atusb_in: zero-sized URB ?\n");
289 return;
290 }
291
292 len = *skb->data;
293
294 if (urb->actual_length == 1) {
295 atusb_tx_done(atusb, len);
296 return;
297 }
298
299 if (len + 1 > urb->actual_length - 1) {
300 dev_dbg(&usb_dev->dev, "atusb_in: frame len %d+1 > URB %u-1\n",
301 len, urb->actual_length);
302 return;
303 }
304
305 if (!ieee802154_is_valid_psdu_len(len)) {
306 dev_dbg(&usb_dev->dev, "atusb_in: frame corrupted\n");
307 return;
308 }
309
310 lqi = skb->data[len + 1];
311 dev_dbg(&usb_dev->dev, "atusb_in: rx len %d lqi 0x%02x\n", len, lqi);
312 skb_pull(skb, 1); /* remove PHR */
313 skb_trim(skb, len); /* get payload only */
314 ieee802154_rx_irqsafe(atusb->hw, skb, lqi);
315 urb->context = NULL; /* skb is gone */
316}
317
318static void atusb_in(struct urb *urb)
319{
320 struct usb_device *usb_dev = urb->dev;
321 struct sk_buff *skb = urb->context;
322 struct atusb *atusb = SKB_ATUSB(skb);
323
324 dev_dbg(&usb_dev->dev, "%s: status %d len %d\n", __func__,
325 urb->status, urb->actual_length);
326 if (urb->status) {
327 if (urb->status == -ENOENT) { /* being killed */
328 kfree_skb(skb);
329 urb->context = NULL;
330 return;
331 }
332 dev_dbg(&usb_dev->dev, "%s: URB error %d\n", __func__, urb->status);
333 } else {
334 atusb_in_good(urb);
335 }
336
337 usb_anchor_urb(urb, &atusb->idle_urbs);
338 if (!atusb->shutdown)
339 schedule_delayed_work(&atusb->work, 0);
340}
341
342/* ----- URB allocation/deallocation --------------------------------------- */
343
344static void atusb_free_urbs(struct atusb *atusb)
345{
346 struct urb *urb;
347
348 while (1) {
349 urb = usb_get_from_anchor(&atusb->idle_urbs);
350 if (!urb)
351 break;
352 kfree_skb(urb->context);
353 usb_free_urb(urb);
354 }
355}
356
357static int atusb_alloc_urbs(struct atusb *atusb, int n)
358{
359 struct urb *urb;
360
361 while (n) {
362 urb = usb_alloc_urb(0, GFP_KERNEL);
363 if (!urb) {
364 atusb_free_urbs(atusb);
365 return -ENOMEM;
366 }
367 usb_anchor_urb(urb, &atusb->idle_urbs);
368 n--;
369 }
370 return 0;
371}
372
373/* ----- IEEE 802.15.4 interface operations -------------------------------- */
374
375static void atusb_xmit_complete(struct urb *urb)
376{
377 dev_dbg(&urb->dev->dev, "atusb_xmit urb completed");
378}
379
380static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
381{
382 struct atusb *atusb = hw->priv;
383 struct usb_device *usb_dev = atusb->usb_dev;
384 int ret;
385
386 dev_dbg(&usb_dev->dev, "%s (%d)\n", __func__, skb->len);
387 atusb->tx_skb = skb;
388 atusb->tx_ack_seq++;
389 atusb->tx_dr.wIndex = cpu_to_le16(atusb->tx_ack_seq);
390 atusb->tx_dr.wLength = cpu_to_le16(skb->len);
391
392 usb_fill_control_urb(atusb->tx_urb, usb_dev,
393 usb_sndctrlpipe(usb_dev, 0),
394 (unsigned char *)&atusb->tx_dr, skb->data,
395 skb->len, atusb_xmit_complete, NULL);
396 ret = usb_submit_urb(atusb->tx_urb, GFP_ATOMIC);
397 dev_dbg(&usb_dev->dev, "%s done (%d)\n", __func__, ret);
398 return ret;
399}
400
401static int atusb_ed(struct ieee802154_hw *hw, u8 *level)
402{
403 WARN_ON(!level);
404 *level = 0xbe;
405 return 0;
406}
407
408static int atusb_set_hw_addr_filt(struct ieee802154_hw *hw,
409 struct ieee802154_hw_addr_filt *filt,
410 unsigned long changed)
411{
412 struct atusb *atusb = hw->priv;
413 struct device *dev = &atusb->usb_dev->dev;
414
415 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
416 u16 addr = le16_to_cpu(filt->short_addr);
417
418 dev_vdbg(dev, "%s called for saddr\n", __func__);
419 atusb_write_reg(atusb, RG_SHORT_ADDR_0, addr);
420 atusb_write_reg(atusb, RG_SHORT_ADDR_1, addr >> 8);
421 }
422
423 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
424 u16 pan = le16_to_cpu(filt->pan_id);
425
426 dev_vdbg(dev, "%s called for pan id\n", __func__);
427 atusb_write_reg(atusb, RG_PAN_ID_0, pan);
428 atusb_write_reg(atusb, RG_PAN_ID_1, pan >> 8);
429 }
430
431 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
432 u8 i, addr[IEEE802154_EXTENDED_ADDR_LEN];
433
434 memcpy(addr, &filt->ieee_addr, IEEE802154_EXTENDED_ADDR_LEN);
435 dev_vdbg(dev, "%s called for IEEE addr\n", __func__);
436 for (i = 0; i < 8; i++)
437 atusb_write_reg(atusb, RG_IEEE_ADDR_0 + i, addr[i]);
438 }
439
440 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
441 dev_vdbg(dev, "%s called for panc change\n", __func__);
442 if (filt->pan_coord)
443 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1);
444 else
445 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0);
446 }
447
448 return atusb_get_and_clear_error(atusb);
449}
450
451static int atusb_start(struct ieee802154_hw *hw)
452{
453 struct atusb *atusb = hw->priv;
454 struct usb_device *usb_dev = atusb->usb_dev;
455 int ret;
456
457 dev_dbg(&usb_dev->dev, "%s\n", __func__);
458 schedule_delayed_work(&atusb->work, 0);
459 atusb_command(atusb, ATUSB_RX_MODE, 1);
460 ret = atusb_get_and_clear_error(atusb);
461 if (ret < 0)
462 usb_kill_anchored_urbs(&atusb->idle_urbs);
463 return ret;
464}
465
466static void atusb_stop(struct ieee802154_hw *hw)
467{
468 struct atusb *atusb = hw->priv;
469 struct usb_device *usb_dev = atusb->usb_dev;
470
471 dev_dbg(&usb_dev->dev, "%s\n", __func__);
472 usb_kill_anchored_urbs(&atusb->idle_urbs);
473 atusb_command(atusb, ATUSB_RX_MODE, 0);
474 atusb_get_and_clear_error(atusb);
475}
476
477#define ATUSB_MAX_TX_POWERS 0xF
478static const s32 atusb_powers[ATUSB_MAX_TX_POWERS + 1] = {
479 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
480 -900, -1200, -1700,
481};
482
483static int
484atusb_txpower(struct ieee802154_hw *hw, s32 mbm)
485{
486 struct atusb *atusb = hw->priv;
487
488 if (atusb->data)
489 return atusb->data->set_txpower(hw, mbm);
490 else
491 return -ENOTSUPP;
492}
493
494static int
495atusb_set_txpower(struct ieee802154_hw *hw, s32 mbm)
496{
497 struct atusb *atusb = hw->priv;
498 u32 i;
499
500 for (i = 0; i < hw->phy->supported.tx_powers_size; i++) {
501 if (hw->phy->supported.tx_powers[i] == mbm)
502 return atusb_write_subreg(atusb, SR_TX_PWR_23X, i);
503 }
504
505 return -EINVAL;
506}
507
508static int
509hulusb_set_txpower(struct ieee802154_hw *hw, s32 mbm)
510{
511 u32 i;
512
513 for (i = 0; i < hw->phy->supported.tx_powers_size; i++) {
514 if (hw->phy->supported.tx_powers[i] == mbm)
515 return atusb_write_subreg(hw->priv, SR_TX_PWR_212, i);
516 }
517
518 return -EINVAL;
519}
520
521#define ATUSB_MAX_ED_LEVELS 0xF
522static const s32 atusb_ed_levels[ATUSB_MAX_ED_LEVELS + 1] = {
523 -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
524 -7100, -6900, -6700, -6500, -6300, -6100,
525};
526
527#define AT86RF212_MAX_TX_POWERS 0x1F
528static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
529 500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
530 -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
531 -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
532};
533
534#define AT86RF2XX_MAX_ED_LEVELS 0xF
535static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
536 -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
537 -8000, -7800, -7600, -7400, -7200, -7000,
538};
539
540static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
541 -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
542 -7800, -7600, -7400, -7200, -7000, -6800,
543};
544
545static int
546atusb_set_cca_mode(struct ieee802154_hw *hw, const struct wpan_phy_cca *cca)
547{
548 struct atusb *atusb = hw->priv;
549 u8 val;
550
551 /* mapping 802.15.4 to driver spec */
552 switch (cca->mode) {
553 case NL802154_CCA_ENERGY:
554 val = 1;
555 break;
556 case NL802154_CCA_CARRIER:
557 val = 2;
558 break;
559 case NL802154_CCA_ENERGY_CARRIER:
560 switch (cca->opt) {
561 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
562 val = 3;
563 break;
564 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
565 val = 0;
566 break;
567 default:
568 return -EINVAL;
569 }
570 break;
571 default:
572 return -EINVAL;
573 }
574
575 return atusb_write_subreg(atusb, SR_CCA_MODE, val);
576}
577
578static int hulusb_set_cca_ed_level(struct atusb *lp, int rssi_base_val)
579{
580 unsigned int cca_ed_thres;
581
582 cca_ed_thres = atusb_read_subreg(lp, SR_CCA_ED_THRES);
583
584 switch (rssi_base_val) {
585 case -98:
586 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
587 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
588 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
589 break;
590 case -100:
591 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
592 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
593 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
594 break;
595 default:
596 WARN_ON(1);
597 }
598
599 return 0;
600}
601
602static int
603atusb_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
604{
605 struct atusb *atusb = hw->priv;
606 u32 i;
607
608 for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
609 if (hw->phy->supported.cca_ed_levels[i] == mbm)
610 return atusb_write_subreg(atusb, SR_CCA_ED_THRES, i);
611 }
612
613 return -EINVAL;
614}
615
616static int atusb_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
617{
618 struct atusb *atusb = hw->priv;
619 int ret = -ENOTSUPP;
620
621 if (atusb->data) {
622 ret = atusb->data->set_channel(hw, page, channel);
623 /* @@@ ugly synchronization */
624 msleep(atusb->data->t_channel_switch);
625 }
626
627 return ret;
628}
629
630static int atusb_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
631{
632 struct atusb *atusb = hw->priv;
633 int ret;
634
635 ret = atusb_write_subreg(atusb, SR_CHANNEL, channel);
636 if (ret < 0)
637 return ret;
638 return 0;
639}
640
641static int hulusb_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
642{
643 int rc;
644 int rssi_base_val;
645
646 struct atusb *lp = hw->priv;
647
648 if (channel == 0)
649 rc = atusb_write_subreg(lp, SR_SUB_MODE, 0);
650 else
651 rc = atusb_write_subreg(lp, SR_SUB_MODE, 1);
652 if (rc < 0)
653 return rc;
654
655 if (page == 0) {
656 rc = atusb_write_subreg(lp, SR_BPSK_QPSK, 0);
657 rssi_base_val = -100;
658 } else {
659 rc = atusb_write_subreg(lp, SR_BPSK_QPSK, 1);
660 rssi_base_val = -98;
661 }
662 if (rc < 0)
663 return rc;
664
665 rc = hulusb_set_cca_ed_level(lp, rssi_base_val);
666 if (rc < 0)
667 return rc;
668
669 /* This sets the symbol_duration according frequency on the 212.
670 * TODO move this handling while set channel and page in cfg802154.
671 * We can do that, this timings are according 802.15.4 standard.
672 * If we do that in cfg802154, this is a more generic calculation.
673 *
674 * This should also protected from ifs_timer. Means cancel timer and
675 * init with a new value. For now, this is okay.
676 */
677 if (channel == 0) {
678 if (page == 0) {
679 /* SUB:0 and BPSK:0 -> BPSK-20 */
680 lp->hw->phy->symbol_duration = 50;
681 } else {
682 /* SUB:1 and BPSK:0 -> BPSK-40 */
683 lp->hw->phy->symbol_duration = 25;
684 }
685 } else {
686 if (page == 0)
687 /* SUB:0 and BPSK:1 -> OQPSK-100/200/400 */
688 lp->hw->phy->symbol_duration = 40;
689 else
690 /* SUB:1 and BPSK:1 -> OQPSK-250/500/1000 */
691 lp->hw->phy->symbol_duration = 16;
692 }
693
694 lp->hw->phy->lifs_period = IEEE802154_LIFS_PERIOD *
695 lp->hw->phy->symbol_duration;
696 lp->hw->phy->sifs_period = IEEE802154_SIFS_PERIOD *
697 lp->hw->phy->symbol_duration;
698
699 return atusb_write_subreg(lp, SR_CHANNEL, channel);
700}
701
702static int
703atusb_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be, u8 retries)
704{
705 struct atusb *atusb = hw->priv;
706 int ret;
707
708 ret = atusb_write_subreg(atusb, SR_MIN_BE, min_be);
709 if (ret)
710 return ret;
711
712 ret = atusb_write_subreg(atusb, SR_MAX_BE, max_be);
713 if (ret)
714 return ret;
715
716 return atusb_write_subreg(atusb, SR_MAX_CSMA_RETRIES, retries);
717}
718
719static int
720hulusb_set_lbt(struct ieee802154_hw *hw, bool on)
721{
722 struct atusb *atusb = hw->priv;
723
724 return atusb_write_subreg(atusb, SR_CSMA_LBT_MODE, on);
725}
726
727static int
728atusb_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
729{
730 struct atusb *atusb = hw->priv;
731
732 return atusb_write_subreg(atusb, SR_MAX_FRAME_RETRIES, retries);
733}
734
735static int
736atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
737{
738 struct atusb *atusb = hw->priv;
739 int ret;
740
741 if (on) {
742 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1);
743 if (ret < 0)
744 return ret;
745
746 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1);
747 if (ret < 0)
748 return ret;
749 } else {
750 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0);
751 if (ret < 0)
752 return ret;
753
754 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0);
755 if (ret < 0)
756 return ret;
757 }
758
759 return 0;
760}
761
762static struct atusb_chip_data atusb_chip_data = {
763 .t_channel_switch = 1,
764 .rssi_base_val = -91,
765 .set_txpower = atusb_set_txpower,
766 .set_channel = atusb_set_channel,
767};
768
769static struct atusb_chip_data hulusb_chip_data = {
770 .t_channel_switch = 11,
771 .rssi_base_val = -100,
772 .set_txpower = hulusb_set_txpower,
773 .set_channel = hulusb_set_channel,
774};
775
776static const struct ieee802154_ops atusb_ops = {
777 .owner = THIS_MODULE,
778 .xmit_async = atusb_xmit,
779 .ed = atusb_ed,
780 .set_channel = atusb_channel,
781 .start = atusb_start,
782 .stop = atusb_stop,
783 .set_hw_addr_filt = atusb_set_hw_addr_filt,
784 .set_txpower = atusb_txpower,
785 .set_lbt = hulusb_set_lbt,
786 .set_cca_mode = atusb_set_cca_mode,
787 .set_cca_ed_level = atusb_set_cca_ed_level,
788 .set_csma_params = atusb_set_csma_params,
789 .set_frame_retries = atusb_set_frame_retries,
790 .set_promiscuous_mode = atusb_set_promiscuous_mode,
791};
792
793/* ----- Firmware and chip version information ----------------------------- */
794
795static int atusb_get_and_show_revision(struct atusb *atusb)
796{
797 struct usb_device *usb_dev = atusb->usb_dev;
798 char *hw_name;
799 unsigned char *buffer;
800 int ret;
801
802 buffer = kmalloc(3, GFP_KERNEL);
803 if (!buffer)
804 return -ENOMEM;
805
806 /* Get a couple of the ATMega Firmware values */
807 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
808 ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0,
809 buffer, 3, 1000);
810 if (ret >= 0) {
811 atusb->fw_ver_maj = buffer[0];
812 atusb->fw_ver_min = buffer[1];
813 atusb->fw_hw_type = buffer[2];
814
815 switch (atusb->fw_hw_type) {
816 case ATUSB_HW_TYPE_100813:
817 case ATUSB_HW_TYPE_101216:
818 case ATUSB_HW_TYPE_110131:
819 hw_name = "ATUSB";
820 atusb->data = &atusb_chip_data;
821 break;
822 case ATUSB_HW_TYPE_RZUSB:
823 hw_name = "RZUSB";
824 atusb->data = &atusb_chip_data;
825 break;
826 case ATUSB_HW_TYPE_HULUSB:
827 hw_name = "HULUSB";
828 atusb->data = &hulusb_chip_data;
829 break;
830 default:
831 hw_name = "UNKNOWN";
832 atusb->err = -ENOTSUPP;
833 ret = -ENOTSUPP;
834 break;
835 }
836
837 dev_info(&usb_dev->dev,
838 "Firmware: major: %u, minor: %u, hardware type: %s (%d)\n",
839 atusb->fw_ver_maj, atusb->fw_ver_min, hw_name,
840 atusb->fw_hw_type);
841 }
842 if (atusb->fw_ver_maj == 0 && atusb->fw_ver_min < 2) {
843 dev_info(&usb_dev->dev,
844 "Firmware version (%u.%u) predates our first public release.",
845 atusb->fw_ver_maj, atusb->fw_ver_min);
846 dev_info(&usb_dev->dev, "Please update to version 0.2 or newer");
847 }
848
849 kfree(buffer);
850 return ret;
851}
852
853static int atusb_get_and_show_build(struct atusb *atusb)
854{
855 struct usb_device *usb_dev = atusb->usb_dev;
856 char *build;
857 int ret;
858
859 build = kmalloc(ATUSB_BUILD_SIZE + 1, GFP_KERNEL);
860 if (!build)
861 return -ENOMEM;
862
863 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
864 ATUSB_BUILD, ATUSB_REQ_FROM_DEV, 0, 0,
865 build, ATUSB_BUILD_SIZE, 1000);
866 if (ret >= 0) {
867 build[ret] = 0;
868 dev_info(&usb_dev->dev, "Firmware: build %s\n", build);
869 }
870
871 kfree(build);
872 return ret;
873}
874
875static int atusb_get_and_conf_chip(struct atusb *atusb)
876{
877 struct usb_device *usb_dev = atusb->usb_dev;
878 u8 man_id_0, man_id_1, part_num, version_num;
879 const char *chip;
880 struct ieee802154_hw *hw = atusb->hw;
881
882 man_id_0 = atusb_read_reg(atusb, RG_MAN_ID_0);
883 man_id_1 = atusb_read_reg(atusb, RG_MAN_ID_1);
884 part_num = atusb_read_reg(atusb, RG_PART_NUM);
885 version_num = atusb_read_reg(atusb, RG_VERSION_NUM);
886
887 if (atusb->err)
888 return atusb->err;
889
890 hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
891 IEEE802154_HW_PROMISCUOUS | IEEE802154_HW_CSMA_PARAMS;
892
893 hw->phy->flags = WPAN_PHY_FLAG_TXPOWER | WPAN_PHY_FLAG_CCA_ED_LEVEL |
894 WPAN_PHY_FLAG_CCA_MODE;
895
896 hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
897 BIT(NL802154_CCA_CARRIER) |
898 BIT(NL802154_CCA_ENERGY_CARRIER);
899 hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
900 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
901
902 hw->phy->cca.mode = NL802154_CCA_ENERGY;
903
904 hw->phy->current_page = 0;
905
906 if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) {
907 dev_err(&usb_dev->dev,
908 "non-Atmel transceiver xxxx%02x%02x\n",
909 man_id_1, man_id_0);
910 goto fail;
911 }
912
913 switch (part_num) {
914 case 2:
915 chip = "AT86RF230";
916 atusb->hw->phy->supported.channels[0] = 0x7FFF800;
917 atusb->hw->phy->current_channel = 11; /* reset default */
918 atusb->hw->phy->symbol_duration = 16;
919 atusb->hw->phy->supported.tx_powers = atusb_powers;
920 atusb->hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
921 hw->phy->supported.cca_ed_levels = atusb_ed_levels;
922 hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(atusb_ed_levels);
923 break;
924 case 3:
925 chip = "AT86RF231";
926 atusb->hw->phy->supported.channels[0] = 0x7FFF800;
927 atusb->hw->phy->current_channel = 11; /* reset default */
928 atusb->hw->phy->symbol_duration = 16;
929 atusb->hw->phy->supported.tx_powers = atusb_powers;
930 atusb->hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
931 hw->phy->supported.cca_ed_levels = atusb_ed_levels;
932 hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(atusb_ed_levels);
933 break;
934 case 7:
935 chip = "AT86RF212";
936 atusb->hw->flags |= IEEE802154_HW_LBT;
937 atusb->hw->phy->supported.channels[0] = 0x00007FF;
938 atusb->hw->phy->supported.channels[2] = 0x00007FF;
939 atusb->hw->phy->current_channel = 5;
940 atusb->hw->phy->symbol_duration = 25;
941 atusb->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
942 atusb->hw->phy->supported.tx_powers = at86rf212_powers;
943 atusb->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
944 atusb->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
945 atusb->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
946 break;
947 default:
948 dev_err(&usb_dev->dev,
949 "unexpected transceiver, part 0x%02x version 0x%02x\n",
950 part_num, version_num);
951 goto fail;
952 }
953
954 hw->phy->transmit_power = hw->phy->supported.tx_powers[0];
955 hw->phy->cca_ed_level = hw->phy->supported.cca_ed_levels[7];
956
957 dev_info(&usb_dev->dev, "ATUSB: %s version %d\n", chip, version_num);
958
959 return 0;
960
961fail:
962 atusb->err = -ENODEV;
963 return -ENODEV;
964}
965
966static int atusb_set_extended_addr(struct atusb *atusb)
967{
968 struct usb_device *usb_dev = atusb->usb_dev;
969 unsigned char *buffer;
970 __le64 extended_addr;
971 u64 addr;
972 int ret;
973
974 /* Firmware versions before 0.3 do not support the EUI64_READ command.
975 * Just use a random address and be done.
976 */
977 if (atusb->fw_ver_maj == 0 && atusb->fw_ver_min < 3) {
978 ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
979 return 0;
980 }
981
982 buffer = kmalloc(IEEE802154_EXTENDED_ADDR_LEN, GFP_KERNEL);
983 if (!buffer)
984 return -ENOMEM;
985
986 /* Firmware is new enough so we fetch the address from EEPROM */
987 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
988 ATUSB_EUI64_READ, ATUSB_REQ_FROM_DEV, 0, 0,
989 buffer, IEEE802154_EXTENDED_ADDR_LEN, 1000);
990 if (ret < 0) {
991 dev_err(&usb_dev->dev, "failed to fetch extended address, random address set\n");
992 ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
993 kfree(buffer);
994 return ret;
995 }
996
997 memcpy(&extended_addr, buffer, IEEE802154_EXTENDED_ADDR_LEN);
998 /* Check if read address is not empty and the unicast bit is set correctly */
999 if (!ieee802154_is_valid_extended_unicast_addr(extended_addr)) {
1000 dev_info(&usb_dev->dev, "no permanent extended address found, random address set\n");
1001 ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
1002 } else {
1003 atusb->hw->phy->perm_extended_addr = extended_addr;
1004 addr = swab64((__force u64)atusb->hw->phy->perm_extended_addr);
1005 dev_info(&usb_dev->dev, "Read permanent extended address %8phC from device\n",
1006 &addr);
1007 }
1008
1009 kfree(buffer);
1010 return ret;
1011}
1012
1013/* ----- Setup ------------------------------------------------------------- */
1014
1015static int atusb_probe(struct usb_interface *interface,
1016 const struct usb_device_id *id)
1017{
1018 struct usb_device *usb_dev = interface_to_usbdev(interface);
1019 struct ieee802154_hw *hw;
1020 struct atusb *atusb = NULL;
1021 int ret = -ENOMEM;
1022
1023 hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops);
1024 if (!hw)
1025 return -ENOMEM;
1026
1027 atusb = hw->priv;
1028 atusb->hw = hw;
1029 atusb->usb_dev = usb_get_dev(usb_dev);
1030 usb_set_intfdata(interface, atusb);
1031
1032 atusb->shutdown = 0;
1033 atusb->err = 0;
1034 INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs);
1035 init_usb_anchor(&atusb->idle_urbs);
1036 init_usb_anchor(&atusb->rx_urbs);
1037
1038 if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS))
1039 goto fail;
1040
1041 atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV;
1042 atusb->tx_dr.bRequest = ATUSB_TX;
1043 atusb->tx_dr.wValue = cpu_to_le16(0);
1044
1045 atusb->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1046 if (!atusb->tx_urb)
1047 goto fail;
1048
1049 hw->parent = &usb_dev->dev;
1050
1051 atusb_command(atusb, ATUSB_RF_RESET, 0);
1052 atusb_get_and_conf_chip(atusb);
1053 atusb_get_and_show_revision(atusb);
1054 atusb_get_and_show_build(atusb);
1055 atusb_set_extended_addr(atusb);
1056
1057 if ((atusb->fw_ver_maj == 0 && atusb->fw_ver_min >= 3) || atusb->fw_ver_maj > 0)
1058 hw->flags |= IEEE802154_HW_FRAME_RETRIES;
1059
1060 ret = atusb_get_and_clear_error(atusb);
1061 if (ret) {
1062 dev_err(&atusb->usb_dev->dev,
1063 "%s: initialization failed, error = %d\n",
1064 __func__, ret);
1065 goto fail;
1066 }
1067
1068 ret = ieee802154_register_hw(hw);
1069 if (ret)
1070 goto fail;
1071
1072 /* If we just powered on, we're now in P_ON and need to enter TRX_OFF
1073 * explicitly. Any resets after that will send us straight to TRX_OFF,
1074 * making the command below redundant.
1075 */
1076 atusb_write_reg(atusb, RG_TRX_STATE, STATE_FORCE_TRX_OFF);
1077 msleep(1); /* reset => TRX_OFF, tTR13 = 37 us */
1078
1079#if 0
1080 /* Calculating the maximum time available to empty the frame buffer
1081 * on reception:
1082 *
1083 * According to [1], the inter-frame gap is
1084 * R * 20 * 16 us + 128 us
1085 * where R is a random number from 0 to 7. Furthermore, we have 20 bit
1086 * times (80 us at 250 kbps) of SHR of the next frame before the
1087 * transceiver begins storing data in the frame buffer.
1088 *
1089 * This yields a minimum time of 208 us between the last data of a
1090 * frame and the first data of the next frame. This time is further
1091 * reduced by interrupt latency in the atusb firmware.
1092 *
1093 * atusb currently needs about 500 us to retrieve a maximum-sized
1094 * frame. We therefore have to allow reception of a new frame to begin
1095 * while we retrieve the previous frame.
1096 *
1097 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based
1098 * network", Jennic 2006.
1099 * http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
1100 */
1101
1102 atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1);
1103#endif
1104 atusb_write_reg(atusb, RG_IRQ_MASK, 0xff);
1105
1106 ret = atusb_get_and_clear_error(atusb);
1107 if (!ret)
1108 return 0;
1109
1110 dev_err(&atusb->usb_dev->dev,
1111 "%s: setup failed, error = %d\n",
1112 __func__, ret);
1113
1114 ieee802154_unregister_hw(hw);
1115fail:
1116 atusb_free_urbs(atusb);
1117 usb_kill_urb(atusb->tx_urb);
1118 usb_free_urb(atusb->tx_urb);
1119 usb_put_dev(usb_dev);
1120 ieee802154_free_hw(hw);
1121 return ret;
1122}
1123
1124static void atusb_disconnect(struct usb_interface *interface)
1125{
1126 struct atusb *atusb = usb_get_intfdata(interface);
1127
1128 dev_dbg(&atusb->usb_dev->dev, "%s\n", __func__);
1129
1130 atusb->shutdown = 1;
1131 cancel_delayed_work_sync(&atusb->work);
1132
1133 usb_kill_anchored_urbs(&atusb->rx_urbs);
1134 atusb_free_urbs(atusb);
1135 usb_kill_urb(atusb->tx_urb);
1136 usb_free_urb(atusb->tx_urb);
1137
1138 ieee802154_unregister_hw(atusb->hw);
1139
1140 usb_put_dev(atusb->usb_dev);
1141
1142 ieee802154_free_hw(atusb->hw);
1143
1144 usb_set_intfdata(interface, NULL);
1145
1146 pr_debug("%s done\n", __func__);
1147}
1148
1149/* The devices we work with */
1150static const struct usb_device_id atusb_device_table[] = {
1151 {
1152 .match_flags = USB_DEVICE_ID_MATCH_DEVICE |
1153 USB_DEVICE_ID_MATCH_INT_INFO,
1154 .idVendor = ATUSB_VENDOR_ID,
1155 .idProduct = ATUSB_PRODUCT_ID,
1156 .bInterfaceClass = USB_CLASS_VENDOR_SPEC
1157 },
1158 /* end with null element */
1159 {}
1160};
1161MODULE_DEVICE_TABLE(usb, atusb_device_table);
1162
1163static struct usb_driver atusb_driver = {
1164 .name = "atusb",
1165 .probe = atusb_probe,
1166 .disconnect = atusb_disconnect,
1167 .id_table = atusb_device_table,
1168};
1169module_usb_driver(atusb_driver);
1170
1171MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>");
1172MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>");
1173MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>");
1174MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>");
1175MODULE_AUTHOR("Josef Filzmaier <j.filzmaier@gmx.at>");
1176MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver");
1177MODULE_LICENSE("GPL");
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
45struct 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 /* Firmware variable */
63 unsigned char fw_ver_maj; /* Firmware major version number */
64 unsigned char fw_ver_min; /* Firmware minor version number */
65 unsigned char fw_hw_type; /* Firmware hardware type */
66};
67
68/* ----- USB commands without data ----------------------------------------- */
69
70/* To reduce the number of error checks in the code, we record the first error
71 * in atusb->err and reject all subsequent requests until the error is cleared.
72 */
73
74static int atusb_control_msg(struct atusb *atusb, unsigned int pipe,
75 __u8 request, __u8 requesttype,
76 __u16 value, __u16 index,
77 void *data, __u16 size, int timeout)
78{
79 struct usb_device *usb_dev = atusb->usb_dev;
80 int ret;
81
82 if (atusb->err)
83 return atusb->err;
84
85 ret = usb_control_msg(usb_dev, pipe, request, requesttype,
86 value, index, data, size, timeout);
87 if (ret < 0) {
88 atusb->err = ret;
89 dev_err(&usb_dev->dev,
90 "atusb_control_msg: req 0x%02x val 0x%x idx 0x%x, error %d\n",
91 request, value, index, ret);
92 }
93 return ret;
94}
95
96static int atusb_command(struct atusb *atusb, uint8_t cmd, uint8_t arg)
97{
98 struct usb_device *usb_dev = atusb->usb_dev;
99
100 dev_dbg(&usb_dev->dev, "atusb_command: cmd = 0x%x\n", cmd);
101 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
102 cmd, ATUSB_REQ_TO_DEV, arg, 0, NULL, 0, 1000);
103}
104
105static int atusb_write_reg(struct atusb *atusb, uint8_t reg, uint8_t value)
106{
107 struct usb_device *usb_dev = atusb->usb_dev;
108
109 dev_dbg(&usb_dev->dev, "atusb_write_reg: 0x%02x <- 0x%02x\n",
110 reg, value);
111 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0),
112 ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
113 value, reg, NULL, 0, 1000);
114}
115
116static int atusb_read_reg(struct atusb *atusb, uint8_t reg)
117{
118 struct usb_device *usb_dev = atusb->usb_dev;
119 int ret;
120 uint8_t *buffer;
121 uint8_t value;
122
123 buffer = kmalloc(1, GFP_KERNEL);
124 if (!buffer)
125 return -ENOMEM;
126
127 dev_dbg(&usb_dev->dev, "atusb: reg = 0x%x\n", reg);
128 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
129 ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
130 0, reg, buffer, 1, 1000);
131
132 if (ret >= 0) {
133 value = buffer[0];
134 kfree(buffer);
135 return value;
136 } else {
137 kfree(buffer);
138 return ret;
139 }
140}
141
142static int atusb_write_subreg(struct atusb *atusb, uint8_t reg, uint8_t mask,
143 uint8_t shift, uint8_t value)
144{
145 struct usb_device *usb_dev = atusb->usb_dev;
146 uint8_t orig, tmp;
147 int ret = 0;
148
149 dev_dbg(&usb_dev->dev, "atusb_write_subreg: 0x%02x <- 0x%02x\n",
150 reg, value);
151
152 orig = atusb_read_reg(atusb, reg);
153
154 /* Write the value only into that part of the register which is allowed
155 * by the mask. All other bits stay as before.
156 */
157 tmp = orig & ~mask;
158 tmp |= (value << shift) & mask;
159
160 if (tmp != orig)
161 ret = atusb_write_reg(atusb, reg, tmp);
162
163 return ret;
164}
165
166static int atusb_get_and_clear_error(struct atusb *atusb)
167{
168 int err = atusb->err;
169
170 atusb->err = 0;
171 return err;
172}
173
174/* ----- skb allocation ---------------------------------------------------- */
175
176#define MAX_PSDU 127
177#define MAX_RX_XFER (1 + MAX_PSDU + 2 + 1) /* PHR+PSDU+CRC+LQI */
178
179#define SKB_ATUSB(skb) (*(struct atusb **)(skb)->cb)
180
181static void atusb_in(struct urb *urb);
182
183static int atusb_submit_rx_urb(struct atusb *atusb, struct urb *urb)
184{
185 struct usb_device *usb_dev = atusb->usb_dev;
186 struct sk_buff *skb = urb->context;
187 int ret;
188
189 if (!skb) {
190 skb = alloc_skb(MAX_RX_XFER, GFP_KERNEL);
191 if (!skb) {
192 dev_warn_ratelimited(&usb_dev->dev,
193 "atusb_in: can't allocate skb\n");
194 return -ENOMEM;
195 }
196 skb_put(skb, MAX_RX_XFER);
197 SKB_ATUSB(skb) = atusb;
198 }
199
200 usb_fill_bulk_urb(urb, usb_dev, usb_rcvbulkpipe(usb_dev, 1),
201 skb->data, MAX_RX_XFER, atusb_in, skb);
202 usb_anchor_urb(urb, &atusb->rx_urbs);
203
204 ret = usb_submit_urb(urb, GFP_KERNEL);
205 if (ret) {
206 usb_unanchor_urb(urb);
207 kfree_skb(skb);
208 urb->context = NULL;
209 }
210 return ret;
211}
212
213static void atusb_work_urbs(struct work_struct *work)
214{
215 struct atusb *atusb =
216 container_of(to_delayed_work(work), struct atusb, work);
217 struct usb_device *usb_dev = atusb->usb_dev;
218 struct urb *urb;
219 int ret;
220
221 if (atusb->shutdown)
222 return;
223
224 do {
225 urb = usb_get_from_anchor(&atusb->idle_urbs);
226 if (!urb)
227 return;
228 ret = atusb_submit_rx_urb(atusb, urb);
229 } while (!ret);
230
231 usb_anchor_urb(urb, &atusb->idle_urbs);
232 dev_warn_ratelimited(&usb_dev->dev,
233 "atusb_in: can't allocate/submit URB (%d)\n", ret);
234 schedule_delayed_work(&atusb->work,
235 msecs_to_jiffies(ATUSB_ALLOC_DELAY_MS) + 1);
236}
237
238/* ----- Asynchronous USB -------------------------------------------------- */
239
240static void atusb_tx_done(struct atusb *atusb, uint8_t seq)
241{
242 struct usb_device *usb_dev = atusb->usb_dev;
243 uint8_t expect = atusb->tx_ack_seq;
244
245 dev_dbg(&usb_dev->dev, "atusb_tx_done (0x%02x/0x%02x)\n", seq, expect);
246 if (seq == expect) {
247 /* TODO check for ifs handling in firmware */
248 ieee802154_xmit_complete(atusb->hw, atusb->tx_skb, false);
249 } else {
250 /* TODO I experience this case when atusb has a tx complete
251 * irq before probing, we should fix the firmware it's an
252 * unlikely case now that seq == expect is then true, but can
253 * happen and fail with a tx_skb = NULL;
254 */
255 ieee802154_wake_queue(atusb->hw);
256 if (atusb->tx_skb)
257 dev_kfree_skb_irq(atusb->tx_skb);
258 }
259}
260
261static void atusb_in_good(struct urb *urb)
262{
263 struct usb_device *usb_dev = urb->dev;
264 struct sk_buff *skb = urb->context;
265 struct atusb *atusb = SKB_ATUSB(skb);
266 uint8_t len, lqi;
267
268 if (!urb->actual_length) {
269 dev_dbg(&usb_dev->dev, "atusb_in: zero-sized URB ?\n");
270 return;
271 }
272
273 len = *skb->data;
274
275 if (urb->actual_length == 1) {
276 atusb_tx_done(atusb, len);
277 return;
278 }
279
280 if (len + 1 > urb->actual_length - 1) {
281 dev_dbg(&usb_dev->dev, "atusb_in: frame len %d+1 > URB %u-1\n",
282 len, urb->actual_length);
283 return;
284 }
285
286 if (!ieee802154_is_valid_psdu_len(len)) {
287 dev_dbg(&usb_dev->dev, "atusb_in: frame corrupted\n");
288 return;
289 }
290
291 lqi = skb->data[len + 1];
292 dev_dbg(&usb_dev->dev, "atusb_in: rx len %d lqi 0x%02x\n", len, lqi);
293 skb_pull(skb, 1); /* remove PHR */
294 skb_trim(skb, len); /* get payload only */
295 ieee802154_rx_irqsafe(atusb->hw, skb, lqi);
296 urb->context = NULL; /* skb is gone */
297}
298
299static void atusb_in(struct urb *urb)
300{
301 struct usb_device *usb_dev = urb->dev;
302 struct sk_buff *skb = urb->context;
303 struct atusb *atusb = SKB_ATUSB(skb);
304
305 dev_dbg(&usb_dev->dev, "atusb_in: status %d len %d\n",
306 urb->status, urb->actual_length);
307 if (urb->status) {
308 if (urb->status == -ENOENT) { /* being killed */
309 kfree_skb(skb);
310 urb->context = NULL;
311 return;
312 }
313 dev_dbg(&usb_dev->dev, "atusb_in: URB error %d\n", urb->status);
314 } else {
315 atusb_in_good(urb);
316 }
317
318 usb_anchor_urb(urb, &atusb->idle_urbs);
319 if (!atusb->shutdown)
320 schedule_delayed_work(&atusb->work, 0);
321}
322
323/* ----- URB allocation/deallocation --------------------------------------- */
324
325static void atusb_free_urbs(struct atusb *atusb)
326{
327 struct urb *urb;
328
329 while (1) {
330 urb = usb_get_from_anchor(&atusb->idle_urbs);
331 if (!urb)
332 break;
333 kfree_skb(urb->context);
334 usb_free_urb(urb);
335 }
336}
337
338static int atusb_alloc_urbs(struct atusb *atusb, int n)
339{
340 struct urb *urb;
341
342 while (n) {
343 urb = usb_alloc_urb(0, GFP_KERNEL);
344 if (!urb) {
345 atusb_free_urbs(atusb);
346 return -ENOMEM;
347 }
348 usb_anchor_urb(urb, &atusb->idle_urbs);
349 n--;
350 }
351 return 0;
352}
353
354/* ----- IEEE 802.15.4 interface operations -------------------------------- */
355
356static void atusb_xmit_complete(struct urb *urb)
357{
358 dev_dbg(&urb->dev->dev, "atusb_xmit urb completed");
359}
360
361static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
362{
363 struct atusb *atusb = hw->priv;
364 struct usb_device *usb_dev = atusb->usb_dev;
365 int ret;
366
367 dev_dbg(&usb_dev->dev, "atusb_xmit (%d)\n", skb->len);
368 atusb->tx_skb = skb;
369 atusb->tx_ack_seq++;
370 atusb->tx_dr.wIndex = cpu_to_le16(atusb->tx_ack_seq);
371 atusb->tx_dr.wLength = cpu_to_le16(skb->len);
372
373 usb_fill_control_urb(atusb->tx_urb, usb_dev,
374 usb_sndctrlpipe(usb_dev, 0),
375 (unsigned char *)&atusb->tx_dr, skb->data,
376 skb->len, atusb_xmit_complete, NULL);
377 ret = usb_submit_urb(atusb->tx_urb, GFP_ATOMIC);
378 dev_dbg(&usb_dev->dev, "atusb_xmit done (%d)\n", ret);
379 return ret;
380}
381
382static int atusb_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
383{
384 struct atusb *atusb = hw->priv;
385 int ret;
386
387 ret = atusb_write_subreg(atusb, SR_CHANNEL, channel);
388 if (ret < 0)
389 return ret;
390 msleep(1); /* @@@ ugly synchronization */
391 return 0;
392}
393
394static int atusb_ed(struct ieee802154_hw *hw, u8 *level)
395{
396 BUG_ON(!level);
397 *level = 0xbe;
398 return 0;
399}
400
401static int atusb_set_hw_addr_filt(struct ieee802154_hw *hw,
402 struct ieee802154_hw_addr_filt *filt,
403 unsigned long changed)
404{
405 struct atusb *atusb = hw->priv;
406 struct device *dev = &atusb->usb_dev->dev;
407
408 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
409 u16 addr = le16_to_cpu(filt->short_addr);
410
411 dev_vdbg(dev, "atusb_set_hw_addr_filt called for saddr\n");
412 atusb_write_reg(atusb, RG_SHORT_ADDR_0, addr);
413 atusb_write_reg(atusb, RG_SHORT_ADDR_1, addr >> 8);
414 }
415
416 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
417 u16 pan = le16_to_cpu(filt->pan_id);
418
419 dev_vdbg(dev, "atusb_set_hw_addr_filt called for pan id\n");
420 atusb_write_reg(atusb, RG_PAN_ID_0, pan);
421 atusb_write_reg(atusb, RG_PAN_ID_1, pan >> 8);
422 }
423
424 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
425 u8 i, addr[IEEE802154_EXTENDED_ADDR_LEN];
426
427 memcpy(addr, &filt->ieee_addr, IEEE802154_EXTENDED_ADDR_LEN);
428 dev_vdbg(dev, "atusb_set_hw_addr_filt called for IEEE addr\n");
429 for (i = 0; i < 8; i++)
430 atusb_write_reg(atusb, RG_IEEE_ADDR_0 + i, addr[i]);
431 }
432
433 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
434 dev_vdbg(dev,
435 "atusb_set_hw_addr_filt called for panc change\n");
436 if (filt->pan_coord)
437 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1);
438 else
439 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0);
440 }
441
442 return atusb_get_and_clear_error(atusb);
443}
444
445static int atusb_start(struct ieee802154_hw *hw)
446{
447 struct atusb *atusb = hw->priv;
448 struct usb_device *usb_dev = atusb->usb_dev;
449 int ret;
450
451 dev_dbg(&usb_dev->dev, "atusb_start\n");
452 schedule_delayed_work(&atusb->work, 0);
453 atusb_command(atusb, ATUSB_RX_MODE, 1);
454 ret = atusb_get_and_clear_error(atusb);
455 if (ret < 0)
456 usb_kill_anchored_urbs(&atusb->idle_urbs);
457 return ret;
458}
459
460static void atusb_stop(struct ieee802154_hw *hw)
461{
462 struct atusb *atusb = hw->priv;
463 struct usb_device *usb_dev = atusb->usb_dev;
464
465 dev_dbg(&usb_dev->dev, "atusb_stop\n");
466 usb_kill_anchored_urbs(&atusb->idle_urbs);
467 atusb_command(atusb, ATUSB_RX_MODE, 0);
468 atusb_get_and_clear_error(atusb);
469}
470
471#define ATUSB_MAX_TX_POWERS 0xF
472static const s32 atusb_powers[ATUSB_MAX_TX_POWERS + 1] = {
473 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
474 -900, -1200, -1700,
475};
476
477static int
478atusb_set_txpower(struct ieee802154_hw *hw, s32 mbm)
479{
480 struct atusb *atusb = hw->priv;
481 u32 i;
482
483 for (i = 0; i < hw->phy->supported.tx_powers_size; i++) {
484 if (hw->phy->supported.tx_powers[i] == mbm)
485 return atusb_write_subreg(atusb, SR_TX_PWR_23X, i);
486 }
487
488 return -EINVAL;
489}
490
491#define ATUSB_MAX_ED_LEVELS 0xF
492static const s32 atusb_ed_levels[ATUSB_MAX_ED_LEVELS + 1] = {
493 -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
494 -7100, -6900, -6700, -6500, -6300, -6100,
495};
496
497static int
498atusb_set_cca_mode(struct ieee802154_hw *hw, const struct wpan_phy_cca *cca)
499{
500 struct atusb *atusb = hw->priv;
501 u8 val;
502
503 /* mapping 802.15.4 to driver spec */
504 switch (cca->mode) {
505 case NL802154_CCA_ENERGY:
506 val = 1;
507 break;
508 case NL802154_CCA_CARRIER:
509 val = 2;
510 break;
511 case NL802154_CCA_ENERGY_CARRIER:
512 switch (cca->opt) {
513 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
514 val = 3;
515 break;
516 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
517 val = 0;
518 break;
519 default:
520 return -EINVAL;
521 }
522 break;
523 default:
524 return -EINVAL;
525 }
526
527 return atusb_write_subreg(atusb, SR_CCA_MODE, val);
528}
529
530static int
531atusb_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
532{
533 struct atusb *atusb = hw->priv;
534 u32 i;
535
536 for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
537 if (hw->phy->supported.cca_ed_levels[i] == mbm)
538 return atusb_write_subreg(atusb, SR_CCA_ED_THRES, i);
539 }
540
541 return -EINVAL;
542}
543
544static int
545atusb_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be, u8 retries)
546{
547 struct atusb *atusb = hw->priv;
548 int ret;
549
550 ret = atusb_write_subreg(atusb, SR_MIN_BE, min_be);
551 if (ret)
552 return ret;
553
554 ret = atusb_write_subreg(atusb, SR_MAX_BE, max_be);
555 if (ret)
556 return ret;
557
558 return atusb_write_subreg(atusb, SR_MAX_CSMA_RETRIES, retries);
559}
560
561static int
562atusb_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
563{
564 struct atusb *atusb = hw->priv;
565
566 return atusb_write_subreg(atusb, SR_MAX_FRAME_RETRIES, retries);
567}
568
569static int
570atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
571{
572 struct atusb *atusb = hw->priv;
573 int ret;
574
575 if (on) {
576 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1);
577 if (ret < 0)
578 return ret;
579
580 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1);
581 if (ret < 0)
582 return ret;
583 } else {
584 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0);
585 if (ret < 0)
586 return ret;
587
588 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0);
589 if (ret < 0)
590 return ret;
591 }
592
593 return 0;
594}
595
596static const struct ieee802154_ops atusb_ops = {
597 .owner = THIS_MODULE,
598 .xmit_async = atusb_xmit,
599 .ed = atusb_ed,
600 .set_channel = atusb_channel,
601 .start = atusb_start,
602 .stop = atusb_stop,
603 .set_hw_addr_filt = atusb_set_hw_addr_filt,
604 .set_txpower = atusb_set_txpower,
605 .set_cca_mode = atusb_set_cca_mode,
606 .set_cca_ed_level = atusb_set_cca_ed_level,
607 .set_csma_params = atusb_set_csma_params,
608 .set_frame_retries = atusb_set_frame_retries,
609 .set_promiscuous_mode = atusb_set_promiscuous_mode,
610};
611
612/* ----- Firmware and chip version information ----------------------------- */
613
614static int atusb_get_and_show_revision(struct atusb *atusb)
615{
616 struct usb_device *usb_dev = atusb->usb_dev;
617 unsigned char *buffer;
618 int ret;
619
620 buffer = kmalloc(3, GFP_KERNEL);
621 if (!buffer)
622 return -ENOMEM;
623
624 /* Get a couple of the ATMega Firmware values */
625 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
626 ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0,
627 buffer, 3, 1000);
628 if (ret >= 0) {
629 atusb->fw_ver_maj = buffer[0];
630 atusb->fw_ver_min = buffer[1];
631 atusb->fw_hw_type = buffer[2];
632
633 dev_info(&usb_dev->dev,
634 "Firmware: major: %u, minor: %u, hardware type: %u\n",
635 atusb->fw_ver_maj, atusb->fw_ver_min, atusb->fw_hw_type);
636 }
637 if (atusb->fw_ver_maj == 0 && atusb->fw_ver_min < 2) {
638 dev_info(&usb_dev->dev,
639 "Firmware version (%u.%u) predates our first public release.",
640 atusb->fw_ver_maj, atusb->fw_ver_min);
641 dev_info(&usb_dev->dev, "Please update to version 0.2 or newer");
642 }
643
644 kfree(buffer);
645 return ret;
646}
647
648static int atusb_get_and_show_build(struct atusb *atusb)
649{
650 struct usb_device *usb_dev = atusb->usb_dev;
651 char *build;
652 int ret;
653
654 build = kmalloc(ATUSB_BUILD_SIZE + 1, GFP_KERNEL);
655 if (!build)
656 return -ENOMEM;
657
658 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
659 ATUSB_BUILD, ATUSB_REQ_FROM_DEV, 0, 0,
660 build, ATUSB_BUILD_SIZE, 1000);
661 if (ret >= 0) {
662 build[ret] = 0;
663 dev_info(&usb_dev->dev, "Firmware: build %s\n", build);
664 }
665
666 kfree(build);
667 return ret;
668}
669
670static int atusb_get_and_show_chip(struct atusb *atusb)
671{
672 struct usb_device *usb_dev = atusb->usb_dev;
673 uint8_t man_id_0, man_id_1, part_num, version_num;
674 const char *chip;
675
676 man_id_0 = atusb_read_reg(atusb, RG_MAN_ID_0);
677 man_id_1 = atusb_read_reg(atusb, RG_MAN_ID_1);
678 part_num = atusb_read_reg(atusb, RG_PART_NUM);
679 version_num = atusb_read_reg(atusb, RG_VERSION_NUM);
680
681 if (atusb->err)
682 return atusb->err;
683
684 if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) {
685 dev_err(&usb_dev->dev,
686 "non-Atmel transceiver xxxx%02x%02x\n",
687 man_id_1, man_id_0);
688 goto fail;
689 }
690
691 switch (part_num) {
692 case 2:
693 chip = "AT86RF230";
694 break;
695 case 3:
696 chip = "AT86RF231";
697 break;
698 default:
699 dev_err(&usb_dev->dev,
700 "unexpected transceiver, part 0x%02x version 0x%02x\n",
701 part_num, version_num);
702 goto fail;
703 }
704
705 dev_info(&usb_dev->dev, "ATUSB: %s version %d\n", chip, version_num);
706
707 return 0;
708
709fail:
710 atusb->err = -ENODEV;
711 return -ENODEV;
712}
713
714static int atusb_set_extended_addr(struct atusb *atusb)
715{
716 struct usb_device *usb_dev = atusb->usb_dev;
717 unsigned char *buffer;
718 __le64 extended_addr;
719 u64 addr;
720 int ret;
721
722 /* Firmware versions before 0.3 do not support the EUI64_READ command.
723 * Just use a random address and be done */
724 if (atusb->fw_ver_maj == 0 && atusb->fw_ver_min < 3) {
725 ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
726 return 0;
727 }
728
729 buffer = kmalloc(IEEE802154_EXTENDED_ADDR_LEN, GFP_KERNEL);
730 if (!buffer)
731 return -ENOMEM;
732
733 /* Firmware is new enough so we fetch the address from EEPROM */
734 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
735 ATUSB_EUI64_READ, ATUSB_REQ_FROM_DEV, 0, 0,
736 buffer, IEEE802154_EXTENDED_ADDR_LEN, 1000);
737 if (ret < 0) {
738 dev_err(&usb_dev->dev, "failed to fetch extended address, random address set\n");
739 ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
740 kfree(buffer);
741 return ret;
742 }
743
744 memcpy(&extended_addr, buffer, IEEE802154_EXTENDED_ADDR_LEN);
745 /* Check if read address is not empty and the unicast bit is set correctly */
746 if (!ieee802154_is_valid_extended_unicast_addr(extended_addr)) {
747 dev_info(&usb_dev->dev, "no permanent extended address found, random address set\n");
748 ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
749 } else {
750 atusb->hw->phy->perm_extended_addr = extended_addr;
751 addr = swab64((__force u64)atusb->hw->phy->perm_extended_addr);
752 dev_info(&usb_dev->dev, "Read permanent extended address %8phC from device\n",
753 &addr);
754 }
755
756 kfree(buffer);
757 return ret;
758}
759
760/* ----- Setup ------------------------------------------------------------- */
761
762static int atusb_probe(struct usb_interface *interface,
763 const struct usb_device_id *id)
764{
765 struct usb_device *usb_dev = interface_to_usbdev(interface);
766 struct ieee802154_hw *hw;
767 struct atusb *atusb = NULL;
768 int ret = -ENOMEM;
769
770 hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops);
771 if (!hw)
772 return -ENOMEM;
773
774 atusb = hw->priv;
775 atusb->hw = hw;
776 atusb->usb_dev = usb_get_dev(usb_dev);
777 usb_set_intfdata(interface, atusb);
778
779 atusb->shutdown = 0;
780 atusb->err = 0;
781 INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs);
782 init_usb_anchor(&atusb->idle_urbs);
783 init_usb_anchor(&atusb->rx_urbs);
784
785 if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS))
786 goto fail;
787
788 atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV;
789 atusb->tx_dr.bRequest = ATUSB_TX;
790 atusb->tx_dr.wValue = cpu_to_le16(0);
791
792 atusb->tx_urb = usb_alloc_urb(0, GFP_ATOMIC);
793 if (!atusb->tx_urb)
794 goto fail;
795
796 hw->parent = &usb_dev->dev;
797 hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
798 IEEE802154_HW_PROMISCUOUS | IEEE802154_HW_CSMA_PARAMS;
799
800 hw->phy->flags = WPAN_PHY_FLAG_TXPOWER | WPAN_PHY_FLAG_CCA_ED_LEVEL |
801 WPAN_PHY_FLAG_CCA_MODE;
802
803 hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
804 BIT(NL802154_CCA_CARRIER) | BIT(NL802154_CCA_ENERGY_CARRIER);
805 hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
806 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
807
808 hw->phy->supported.cca_ed_levels = atusb_ed_levels;
809 hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(atusb_ed_levels);
810
811 hw->phy->cca.mode = NL802154_CCA_ENERGY;
812
813 hw->phy->current_page = 0;
814 hw->phy->current_channel = 11; /* reset default */
815 hw->phy->supported.channels[0] = 0x7FFF800;
816 hw->phy->supported.tx_powers = atusb_powers;
817 hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
818 hw->phy->transmit_power = hw->phy->supported.tx_powers[0];
819 hw->phy->cca_ed_level = hw->phy->supported.cca_ed_levels[7];
820
821 atusb_command(atusb, ATUSB_RF_RESET, 0);
822 atusb_get_and_show_chip(atusb);
823 atusb_get_and_show_revision(atusb);
824 atusb_get_and_show_build(atusb);
825 atusb_set_extended_addr(atusb);
826
827 if (atusb->fw_ver_maj >= 0 && atusb->fw_ver_min >= 3)
828 hw->flags |= IEEE802154_HW_FRAME_RETRIES;
829
830 ret = atusb_get_and_clear_error(atusb);
831 if (ret) {
832 dev_err(&atusb->usb_dev->dev,
833 "%s: initialization failed, error = %d\n",
834 __func__, ret);
835 goto fail;
836 }
837
838 ret = ieee802154_register_hw(hw);
839 if (ret)
840 goto fail;
841
842 /* If we just powered on, we're now in P_ON and need to enter TRX_OFF
843 * explicitly. Any resets after that will send us straight to TRX_OFF,
844 * making the command below redundant.
845 */
846 atusb_write_reg(atusb, RG_TRX_STATE, STATE_FORCE_TRX_OFF);
847 msleep(1); /* reset => TRX_OFF, tTR13 = 37 us */
848
849#if 0
850 /* Calculating the maximum time available to empty the frame buffer
851 * on reception:
852 *
853 * According to [1], the inter-frame gap is
854 * R * 20 * 16 us + 128 us
855 * where R is a random number from 0 to 7. Furthermore, we have 20 bit
856 * times (80 us at 250 kbps) of SHR of the next frame before the
857 * transceiver begins storing data in the frame buffer.
858 *
859 * This yields a minimum time of 208 us between the last data of a
860 * frame and the first data of the next frame. This time is further
861 * reduced by interrupt latency in the atusb firmware.
862 *
863 * atusb currently needs about 500 us to retrieve a maximum-sized
864 * frame. We therefore have to allow reception of a new frame to begin
865 * while we retrieve the previous frame.
866 *
867 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based
868 * network", Jennic 2006.
869 * http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
870 */
871
872 atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1);
873#endif
874 atusb_write_reg(atusb, RG_IRQ_MASK, 0xff);
875
876 ret = atusb_get_and_clear_error(atusb);
877 if (!ret)
878 return 0;
879
880 dev_err(&atusb->usb_dev->dev,
881 "%s: setup failed, error = %d\n",
882 __func__, ret);
883
884 ieee802154_unregister_hw(hw);
885fail:
886 atusb_free_urbs(atusb);
887 usb_kill_urb(atusb->tx_urb);
888 usb_free_urb(atusb->tx_urb);
889 usb_put_dev(usb_dev);
890 ieee802154_free_hw(hw);
891 return ret;
892}
893
894static void atusb_disconnect(struct usb_interface *interface)
895{
896 struct atusb *atusb = usb_get_intfdata(interface);
897
898 dev_dbg(&atusb->usb_dev->dev, "atusb_disconnect\n");
899
900 atusb->shutdown = 1;
901 cancel_delayed_work_sync(&atusb->work);
902
903 usb_kill_anchored_urbs(&atusb->rx_urbs);
904 atusb_free_urbs(atusb);
905 usb_kill_urb(atusb->tx_urb);
906 usb_free_urb(atusb->tx_urb);
907
908 ieee802154_unregister_hw(atusb->hw);
909
910 ieee802154_free_hw(atusb->hw);
911
912 usb_set_intfdata(interface, NULL);
913 usb_put_dev(atusb->usb_dev);
914
915 pr_debug("atusb_disconnect done\n");
916}
917
918/* The devices we work with */
919static const struct usb_device_id atusb_device_table[] = {
920 {
921 .match_flags = USB_DEVICE_ID_MATCH_DEVICE |
922 USB_DEVICE_ID_MATCH_INT_INFO,
923 .idVendor = ATUSB_VENDOR_ID,
924 .idProduct = ATUSB_PRODUCT_ID,
925 .bInterfaceClass = USB_CLASS_VENDOR_SPEC
926 },
927 /* end with null element */
928 {}
929};
930MODULE_DEVICE_TABLE(usb, atusb_device_table);
931
932static struct usb_driver atusb_driver = {
933 .name = "atusb",
934 .probe = atusb_probe,
935 .disconnect = atusb_disconnect,
936 .id_table = atusb_device_table,
937};
938module_usb_driver(atusb_driver);
939
940MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>");
941MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>");
942MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>");
943MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>");
944MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver");
945MODULE_LICENSE("GPL");