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
45 struct 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
69 struct 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
atusb_write_subreg(struct atusb * atusb,u8 reg,u8 mask,u8 shift,u8 value)77 static int atusb_write_subreg(struct atusb *atusb, u8 reg, u8 mask,
78 u8 shift, u8 value)
79 {
80 struct usb_device *usb_dev = atusb->usb_dev;
81 u8 orig, tmp;
82 int ret = 0;
83
84 dev_dbg(&usb_dev->dev, "%s: 0x%02x <- 0x%02x\n", __func__, reg, value);
85
86 ret = usb_control_msg_recv(usb_dev, 0, ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
87 0, reg, &orig, 1, 1000, GFP_KERNEL);
88 if (ret < 0)
89 return ret;
90
91 /* Write the value only into that part of the register which is allowed
92 * by the mask. All other bits stay as before.
93 */
94 tmp = orig & ~mask;
95 tmp |= (value << shift) & mask;
96
97 if (tmp != orig)
98 ret = usb_control_msg_send(usb_dev, 0, ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
99 tmp, reg, NULL, 0, 1000, GFP_KERNEL);
100
101 return ret;
102 }
103
atusb_read_subreg(struct atusb * lp,unsigned int addr,unsigned int mask,unsigned int shift)104 static int atusb_read_subreg(struct atusb *lp,
105 unsigned int addr, unsigned int mask,
106 unsigned int shift)
107 {
108 int reg, ret;
109
110 ret = usb_control_msg_recv(lp->usb_dev, 0, ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
111 0, addr, ®, 1, 1000, GFP_KERNEL);
112 if (ret < 0)
113 return ret;
114
115 reg = (reg & mask) >> shift;
116
117 return reg;
118 }
119
atusb_get_and_clear_error(struct atusb * atusb)120 static int atusb_get_and_clear_error(struct atusb *atusb)
121 {
122 int err = atusb->err;
123
124 atusb->err = 0;
125 return err;
126 }
127
128 /* ----- skb allocation ---------------------------------------------------- */
129
130 #define MAX_PSDU 127
131 #define MAX_RX_XFER (1 + MAX_PSDU + 2 + 1) /* PHR+PSDU+CRC+LQI */
132
133 #define SKB_ATUSB(skb) (*(struct atusb **)(skb)->cb)
134
135 static void atusb_in(struct urb *urb);
136
atusb_submit_rx_urb(struct atusb * atusb,struct urb * urb)137 static int atusb_submit_rx_urb(struct atusb *atusb, struct urb *urb)
138 {
139 struct usb_device *usb_dev = atusb->usb_dev;
140 struct sk_buff *skb = urb->context;
141 int ret;
142
143 if (!skb) {
144 skb = alloc_skb(MAX_RX_XFER, GFP_KERNEL);
145 if (!skb) {
146 dev_warn_ratelimited(&usb_dev->dev,
147 "atusb_in: can't allocate skb\n");
148 return -ENOMEM;
149 }
150 skb_put(skb, MAX_RX_XFER);
151 SKB_ATUSB(skb) = atusb;
152 }
153
154 usb_fill_bulk_urb(urb, usb_dev, usb_rcvbulkpipe(usb_dev, 1),
155 skb->data, MAX_RX_XFER, atusb_in, skb);
156 usb_anchor_urb(urb, &atusb->rx_urbs);
157
158 ret = usb_submit_urb(urb, GFP_KERNEL);
159 if (ret) {
160 usb_unanchor_urb(urb);
161 kfree_skb(skb);
162 urb->context = NULL;
163 }
164 return ret;
165 }
166
atusb_work_urbs(struct work_struct * work)167 static void atusb_work_urbs(struct work_struct *work)
168 {
169 struct atusb *atusb =
170 container_of(to_delayed_work(work), struct atusb, work);
171 struct usb_device *usb_dev = atusb->usb_dev;
172 struct urb *urb;
173 int ret;
174
175 if (atusb->shutdown)
176 return;
177
178 do {
179 urb = usb_get_from_anchor(&atusb->idle_urbs);
180 if (!urb)
181 return;
182 ret = atusb_submit_rx_urb(atusb, urb);
183 } while (!ret);
184
185 usb_anchor_urb(urb, &atusb->idle_urbs);
186 dev_warn_ratelimited(&usb_dev->dev,
187 "atusb_in: can't allocate/submit URB (%d)\n", ret);
188 schedule_delayed_work(&atusb->work,
189 msecs_to_jiffies(ATUSB_ALLOC_DELAY_MS) + 1);
190 }
191
192 /* ----- Asynchronous USB -------------------------------------------------- */
193
atusb_tx_done(struct atusb * atusb,u8 seq,int reason)194 static void atusb_tx_done(struct atusb *atusb, u8 seq, int reason)
195 {
196 struct usb_device *usb_dev = atusb->usb_dev;
197 u8 expect = atusb->tx_ack_seq;
198
199 dev_dbg(&usb_dev->dev, "%s (0x%02x/0x%02x)\n", __func__, seq, expect);
200 if (seq == expect) {
201 /* TODO check for ifs handling in firmware */
202 if (reason == IEEE802154_SUCCESS)
203 ieee802154_xmit_complete(atusb->hw, atusb->tx_skb, false);
204 else
205 ieee802154_xmit_error(atusb->hw, atusb->tx_skb, reason);
206 } else {
207 /* TODO I experience this case when atusb has a tx complete
208 * irq before probing, we should fix the firmware it's an
209 * unlikely case now that seq == expect is then true, but can
210 * happen and fail with a tx_skb = NULL;
211 */
212 ieee802154_xmit_hw_error(atusb->hw, atusb->tx_skb);
213 }
214 }
215
atusb_in_good(struct urb * urb)216 static void atusb_in_good(struct urb *urb)
217 {
218 struct usb_device *usb_dev = urb->dev;
219 struct sk_buff *skb = urb->context;
220 struct atusb *atusb = SKB_ATUSB(skb);
221 int result = IEEE802154_SUCCESS;
222 u8 len, lqi, trac;
223
224 if (!urb->actual_length) {
225 dev_dbg(&usb_dev->dev, "atusb_in: zero-sized URB ?\n");
226 return;
227 }
228
229 len = *skb->data;
230
231 switch (urb->actual_length) {
232 case 2:
233 trac = TRAC_MASK(*(skb->data + 1));
234 switch (trac) {
235 case TRAC_SUCCESS:
236 case TRAC_SUCCESS_DATA_PENDING:
237 /* already IEEE802154_SUCCESS */
238 break;
239 case TRAC_CHANNEL_ACCESS_FAILURE:
240 result = IEEE802154_CHANNEL_ACCESS_FAILURE;
241 break;
242 case TRAC_NO_ACK:
243 result = IEEE802154_NO_ACK;
244 break;
245 default:
246 result = IEEE802154_SYSTEM_ERROR;
247 }
248
249 fallthrough;
250 case 1:
251 atusb_tx_done(atusb, len, result);
252 return;
253 }
254
255 if (len + 1 > urb->actual_length - 1) {
256 dev_dbg(&usb_dev->dev, "atusb_in: frame len %d+1 > URB %u-1\n",
257 len, urb->actual_length);
258 return;
259 }
260
261 if (!ieee802154_is_valid_psdu_len(len)) {
262 dev_dbg(&usb_dev->dev, "atusb_in: frame corrupted\n");
263 return;
264 }
265
266 lqi = skb->data[len + 1];
267 dev_dbg(&usb_dev->dev, "atusb_in: rx len %d lqi 0x%02x\n", len, lqi);
268 skb_pull(skb, 1); /* remove PHR */
269 skb_trim(skb, len); /* get payload only */
270 ieee802154_rx_irqsafe(atusb->hw, skb, lqi);
271 urb->context = NULL; /* skb is gone */
272 }
273
atusb_in(struct urb * urb)274 static void atusb_in(struct urb *urb)
275 {
276 struct usb_device *usb_dev = urb->dev;
277 struct sk_buff *skb = urb->context;
278 struct atusb *atusb = SKB_ATUSB(skb);
279
280 dev_dbg(&usb_dev->dev, "%s: status %d len %d\n", __func__,
281 urb->status, urb->actual_length);
282 if (urb->status) {
283 if (urb->status == -ENOENT) { /* being killed */
284 kfree_skb(skb);
285 urb->context = NULL;
286 return;
287 }
288 dev_dbg(&usb_dev->dev, "%s: URB error %d\n", __func__, urb->status);
289 } else {
290 atusb_in_good(urb);
291 }
292
293 usb_anchor_urb(urb, &atusb->idle_urbs);
294 if (!atusb->shutdown)
295 schedule_delayed_work(&atusb->work, 0);
296 }
297
298 /* ----- URB allocation/deallocation --------------------------------------- */
299
atusb_free_urbs(struct atusb * atusb)300 static void atusb_free_urbs(struct atusb *atusb)
301 {
302 struct urb *urb;
303
304 while (1) {
305 urb = usb_get_from_anchor(&atusb->idle_urbs);
306 if (!urb)
307 break;
308 kfree_skb(urb->context);
309 usb_free_urb(urb);
310 }
311 }
312
atusb_alloc_urbs(struct atusb * atusb,int n)313 static int atusb_alloc_urbs(struct atusb *atusb, int n)
314 {
315 struct urb *urb;
316
317 while (n) {
318 urb = usb_alloc_urb(0, GFP_KERNEL);
319 if (!urb) {
320 atusb_free_urbs(atusb);
321 return -ENOMEM;
322 }
323 usb_anchor_urb(urb, &atusb->idle_urbs);
324 usb_free_urb(urb);
325 n--;
326 }
327 return 0;
328 }
329
330 /* ----- IEEE 802.15.4 interface operations -------------------------------- */
331
atusb_xmit_complete(struct urb * urb)332 static void atusb_xmit_complete(struct urb *urb)
333 {
334 dev_dbg(&urb->dev->dev, "atusb_xmit urb completed");
335 }
336
atusb_xmit(struct ieee802154_hw * hw,struct sk_buff * skb)337 static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb)
338 {
339 struct atusb *atusb = hw->priv;
340 struct usb_device *usb_dev = atusb->usb_dev;
341 int ret;
342
343 dev_dbg(&usb_dev->dev, "%s (%d)\n", __func__, skb->len);
344 atusb->tx_skb = skb;
345 atusb->tx_ack_seq++;
346 atusb->tx_dr.wIndex = cpu_to_le16(atusb->tx_ack_seq);
347 atusb->tx_dr.wLength = cpu_to_le16(skb->len);
348
349 usb_fill_control_urb(atusb->tx_urb, usb_dev,
350 usb_sndctrlpipe(usb_dev, 0),
351 (unsigned char *)&atusb->tx_dr, skb->data,
352 skb->len, atusb_xmit_complete, NULL);
353 ret = usb_submit_urb(atusb->tx_urb, GFP_ATOMIC);
354 dev_dbg(&usb_dev->dev, "%s done (%d)\n", __func__, ret);
355 return ret;
356 }
357
atusb_ed(struct ieee802154_hw * hw,u8 * level)358 static int atusb_ed(struct ieee802154_hw *hw, u8 *level)
359 {
360 WARN_ON(!level);
361 *level = 0xbe;
362 return 0;
363 }
364
atusb_set_hw_addr_filt(struct ieee802154_hw * hw,struct ieee802154_hw_addr_filt * filt,unsigned long changed)365 static int atusb_set_hw_addr_filt(struct ieee802154_hw *hw,
366 struct ieee802154_hw_addr_filt *filt,
367 unsigned long changed)
368 {
369 struct atusb *atusb = hw->priv;
370 struct device *dev = &atusb->usb_dev->dev;
371
372 if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
373 u16 addr = le16_to_cpu(filt->short_addr);
374
375 dev_vdbg(dev, "%s called for saddr\n", __func__);
376 usb_control_msg_send(atusb->usb_dev, 0, ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
377 addr, RG_SHORT_ADDR_0, NULL, 0, 1000, GFP_KERNEL);
378
379 usb_control_msg_send(atusb->usb_dev, 0, ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
380 addr >> 8, RG_SHORT_ADDR_1, NULL, 0, 1000, GFP_KERNEL);
381 }
382
383 if (changed & IEEE802154_AFILT_PANID_CHANGED) {
384 u16 pan = le16_to_cpu(filt->pan_id);
385
386 dev_vdbg(dev, "%s called for pan id\n", __func__);
387 usb_control_msg_send(atusb->usb_dev, 0, ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
388 pan, RG_PAN_ID_0, NULL, 0, 1000, GFP_KERNEL);
389
390 usb_control_msg_send(atusb->usb_dev, 0, ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
391 pan >> 8, RG_PAN_ID_1, NULL, 0, 1000, GFP_KERNEL);
392 }
393
394 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
395 u8 i, addr[IEEE802154_EXTENDED_ADDR_LEN];
396
397 memcpy(addr, &filt->ieee_addr, IEEE802154_EXTENDED_ADDR_LEN);
398 dev_vdbg(dev, "%s called for IEEE addr\n", __func__);
399 for (i = 0; i < 8; i++)
400 usb_control_msg_send(atusb->usb_dev, 0, ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
401 addr[i], RG_IEEE_ADDR_0 + i, NULL, 0,
402 1000, GFP_KERNEL);
403 }
404
405 if (changed & IEEE802154_AFILT_PANC_CHANGED) {
406 dev_vdbg(dev, "%s called for panc change\n", __func__);
407 if (filt->pan_coord)
408 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1);
409 else
410 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0);
411 }
412
413 return atusb_get_and_clear_error(atusb);
414 }
415
atusb_start(struct ieee802154_hw * hw)416 static int atusb_start(struct ieee802154_hw *hw)
417 {
418 struct atusb *atusb = hw->priv;
419 struct usb_device *usb_dev = atusb->usb_dev;
420 int ret;
421
422 dev_dbg(&usb_dev->dev, "%s\n", __func__);
423 schedule_delayed_work(&atusb->work, 0);
424 usb_control_msg_send(atusb->usb_dev, 0, ATUSB_RX_MODE, ATUSB_REQ_TO_DEV, 1, 0,
425 NULL, 0, 1000, GFP_KERNEL);
426 ret = atusb_get_and_clear_error(atusb);
427 if (ret < 0)
428 usb_kill_anchored_urbs(&atusb->idle_urbs);
429 return ret;
430 }
431
atusb_stop(struct ieee802154_hw * hw)432 static void atusb_stop(struct ieee802154_hw *hw)
433 {
434 struct atusb *atusb = hw->priv;
435 struct usb_device *usb_dev = atusb->usb_dev;
436
437 dev_dbg(&usb_dev->dev, "%s\n", __func__);
438 usb_kill_anchored_urbs(&atusb->idle_urbs);
439 usb_control_msg_send(atusb->usb_dev, 0, ATUSB_RX_MODE, ATUSB_REQ_TO_DEV, 0, 0,
440 NULL, 0, 1000, GFP_KERNEL);
441 atusb_get_and_clear_error(atusb);
442 }
443
444 #define ATUSB_MAX_TX_POWERS 0xF
445 static const s32 atusb_powers[ATUSB_MAX_TX_POWERS + 1] = {
446 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700,
447 -900, -1200, -1700,
448 };
449
450 static int
atusb_txpower(struct ieee802154_hw * hw,s32 mbm)451 atusb_txpower(struct ieee802154_hw *hw, s32 mbm)
452 {
453 struct atusb *atusb = hw->priv;
454
455 if (atusb->data)
456 return atusb->data->set_txpower(hw, mbm);
457 else
458 return -ENOTSUPP;
459 }
460
461 static int
atusb_set_txpower(struct ieee802154_hw * hw,s32 mbm)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
hulusb_set_txpower(struct ieee802154_hw * hw,s32 mbm)476 hulusb_set_txpower(struct ieee802154_hw *hw, s32 mbm)
477 {
478 u32 i;
479
480 for (i = 0; i < hw->phy->supported.tx_powers_size; i++) {
481 if (hw->phy->supported.tx_powers[i] == mbm)
482 return atusb_write_subreg(hw->priv, SR_TX_PWR_212, i);
483 }
484
485 return -EINVAL;
486 }
487
488 #define ATUSB_MAX_ED_LEVELS 0xF
489 static const s32 atusb_ed_levels[ATUSB_MAX_ED_LEVELS + 1] = {
490 -9100, -8900, -8700, -8500, -8300, -8100, -7900, -7700, -7500, -7300,
491 -7100, -6900, -6700, -6500, -6300, -6100,
492 };
493
494 #define AT86RF212_MAX_TX_POWERS 0x1F
495 static const s32 at86rf212_powers[AT86RF212_MAX_TX_POWERS + 1] = {
496 500, 400, 300, 200, 100, 0, -100, -200, -300, -400, -500, -600, -700,
497 -800, -900, -1000, -1100, -1200, -1300, -1400, -1500, -1600, -1700,
498 -1800, -1900, -2000, -2100, -2200, -2300, -2400, -2500, -2600,
499 };
500
501 #define AT86RF2XX_MAX_ED_LEVELS 0xF
502 static const s32 at86rf212_ed_levels_100[AT86RF2XX_MAX_ED_LEVELS + 1] = {
503 -10000, -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200,
504 -8000, -7800, -7600, -7400, -7200, -7000,
505 };
506
507 static const s32 at86rf212_ed_levels_98[AT86RF2XX_MAX_ED_LEVELS + 1] = {
508 -9800, -9600, -9400, -9200, -9000, -8800, -8600, -8400, -8200, -8000,
509 -7800, -7600, -7400, -7200, -7000, -6800,
510 };
511
512 static int
atusb_set_cca_mode(struct ieee802154_hw * hw,const struct wpan_phy_cca * cca)513 atusb_set_cca_mode(struct ieee802154_hw *hw, const struct wpan_phy_cca *cca)
514 {
515 struct atusb *atusb = hw->priv;
516 u8 val;
517
518 /* mapping 802.15.4 to driver spec */
519 switch (cca->mode) {
520 case NL802154_CCA_ENERGY:
521 val = 1;
522 break;
523 case NL802154_CCA_CARRIER:
524 val = 2;
525 break;
526 case NL802154_CCA_ENERGY_CARRIER:
527 switch (cca->opt) {
528 case NL802154_CCA_OPT_ENERGY_CARRIER_AND:
529 val = 3;
530 break;
531 case NL802154_CCA_OPT_ENERGY_CARRIER_OR:
532 val = 0;
533 break;
534 default:
535 return -EINVAL;
536 }
537 break;
538 default:
539 return -EINVAL;
540 }
541
542 return atusb_write_subreg(atusb, SR_CCA_MODE, val);
543 }
544
hulusb_set_cca_ed_level(struct atusb * lp,int rssi_base_val)545 static int hulusb_set_cca_ed_level(struct atusb *lp, int rssi_base_val)
546 {
547 int cca_ed_thres;
548
549 cca_ed_thres = atusb_read_subreg(lp, SR_CCA_ED_THRES);
550 if (cca_ed_thres < 0)
551 return cca_ed_thres;
552
553 switch (rssi_base_val) {
554 case -98:
555 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_98;
556 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_98);
557 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_98[cca_ed_thres];
558 break;
559 case -100:
560 lp->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
561 lp->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
562 lp->hw->phy->cca_ed_level = at86rf212_ed_levels_100[cca_ed_thres];
563 break;
564 default:
565 WARN_ON(1);
566 }
567
568 return 0;
569 }
570
571 static int
atusb_set_cca_ed_level(struct ieee802154_hw * hw,s32 mbm)572 atusb_set_cca_ed_level(struct ieee802154_hw *hw, s32 mbm)
573 {
574 struct atusb *atusb = hw->priv;
575 u32 i;
576
577 for (i = 0; i < hw->phy->supported.cca_ed_levels_size; i++) {
578 if (hw->phy->supported.cca_ed_levels[i] == mbm)
579 return atusb_write_subreg(atusb, SR_CCA_ED_THRES, i);
580 }
581
582 return -EINVAL;
583 }
584
atusb_channel(struct ieee802154_hw * hw,u8 page,u8 channel)585 static int atusb_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
586 {
587 struct atusb *atusb = hw->priv;
588 int ret = -ENOTSUPP;
589
590 if (atusb->data) {
591 ret = atusb->data->set_channel(hw, page, channel);
592 /* @@@ ugly synchronization */
593 msleep(atusb->data->t_channel_switch);
594 }
595
596 return ret;
597 }
598
atusb_set_channel(struct ieee802154_hw * hw,u8 page,u8 channel)599 static int atusb_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
600 {
601 struct atusb *atusb = hw->priv;
602 int ret;
603
604 ret = atusb_write_subreg(atusb, SR_CHANNEL, channel);
605 if (ret < 0)
606 return ret;
607 return 0;
608 }
609
hulusb_set_channel(struct ieee802154_hw * hw,u8 page,u8 channel)610 static int hulusb_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
611 {
612 int rc;
613 int rssi_base_val;
614
615 struct atusb *lp = hw->priv;
616
617 if (channel == 0)
618 rc = atusb_write_subreg(lp, SR_SUB_MODE, 0);
619 else
620 rc = atusb_write_subreg(lp, SR_SUB_MODE, 1);
621 if (rc < 0)
622 return rc;
623
624 if (page == 0) {
625 rc = atusb_write_subreg(lp, SR_BPSK_QPSK, 0);
626 rssi_base_val = -100;
627 } else {
628 rc = atusb_write_subreg(lp, SR_BPSK_QPSK, 1);
629 rssi_base_val = -98;
630 }
631 if (rc < 0)
632 return rc;
633
634 rc = hulusb_set_cca_ed_level(lp, rssi_base_val);
635 if (rc < 0)
636 return rc;
637
638 return atusb_write_subreg(lp, SR_CHANNEL, channel);
639 }
640
641 static int
atusb_set_csma_params(struct ieee802154_hw * hw,u8 min_be,u8 max_be,u8 retries)642 atusb_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be, u8 retries)
643 {
644 struct atusb *atusb = hw->priv;
645 int ret;
646
647 ret = atusb_write_subreg(atusb, SR_MIN_BE, min_be);
648 if (ret)
649 return ret;
650
651 ret = atusb_write_subreg(atusb, SR_MAX_BE, max_be);
652 if (ret)
653 return ret;
654
655 return atusb_write_subreg(atusb, SR_MAX_CSMA_RETRIES, retries);
656 }
657
658 static int
hulusb_set_lbt(struct ieee802154_hw * hw,bool on)659 hulusb_set_lbt(struct ieee802154_hw *hw, bool on)
660 {
661 struct atusb *atusb = hw->priv;
662
663 return atusb_write_subreg(atusb, SR_CSMA_LBT_MODE, on);
664 }
665
666 static int
atusb_set_frame_retries(struct ieee802154_hw * hw,s8 retries)667 atusb_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
668 {
669 struct atusb *atusb = hw->priv;
670
671 return atusb_write_subreg(atusb, SR_MAX_FRAME_RETRIES, retries);
672 }
673
674 static int
atusb_set_promiscuous_mode(struct ieee802154_hw * hw,const bool on)675 atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
676 {
677 struct atusb *atusb = hw->priv;
678 int ret;
679
680 if (on) {
681 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1);
682 if (ret < 0)
683 return ret;
684
685 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1);
686 if (ret < 0)
687 return ret;
688 } else {
689 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0);
690 if (ret < 0)
691 return ret;
692
693 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0);
694 if (ret < 0)
695 return ret;
696 }
697
698 return 0;
699 }
700
701 static struct atusb_chip_data atusb_chip_data = {
702 .t_channel_switch = 1,
703 .rssi_base_val = -91,
704 .set_txpower = atusb_set_txpower,
705 .set_channel = atusb_set_channel,
706 };
707
708 static struct atusb_chip_data hulusb_chip_data = {
709 .t_channel_switch = 11,
710 .rssi_base_val = -100,
711 .set_txpower = hulusb_set_txpower,
712 .set_channel = hulusb_set_channel,
713 };
714
715 static const struct ieee802154_ops atusb_ops = {
716 .owner = THIS_MODULE,
717 .xmit_async = atusb_xmit,
718 .ed = atusb_ed,
719 .set_channel = atusb_channel,
720 .start = atusb_start,
721 .stop = atusb_stop,
722 .set_hw_addr_filt = atusb_set_hw_addr_filt,
723 .set_txpower = atusb_txpower,
724 .set_lbt = hulusb_set_lbt,
725 .set_cca_mode = atusb_set_cca_mode,
726 .set_cca_ed_level = atusb_set_cca_ed_level,
727 .set_csma_params = atusb_set_csma_params,
728 .set_frame_retries = atusb_set_frame_retries,
729 .set_promiscuous_mode = atusb_set_promiscuous_mode,
730 };
731
732 /* ----- Firmware and chip version information ----------------------------- */
733
atusb_get_and_show_revision(struct atusb * atusb)734 static int atusb_get_and_show_revision(struct atusb *atusb)
735 {
736 struct usb_device *usb_dev = atusb->usb_dev;
737 char *hw_name;
738 unsigned char buffer[3];
739 int ret;
740
741 /* Get a couple of the ATMega Firmware values */
742 ret = usb_control_msg_recv(atusb->usb_dev, 0, ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0,
743 buffer, 3, 1000, GFP_KERNEL);
744 if (!ret) {
745 atusb->fw_ver_maj = buffer[0];
746 atusb->fw_ver_min = buffer[1];
747 atusb->fw_hw_type = buffer[2];
748
749 switch (atusb->fw_hw_type) {
750 case ATUSB_HW_TYPE_100813:
751 case ATUSB_HW_TYPE_101216:
752 case ATUSB_HW_TYPE_110131:
753 hw_name = "ATUSB";
754 atusb->data = &atusb_chip_data;
755 break;
756 case ATUSB_HW_TYPE_RZUSB:
757 hw_name = "RZUSB";
758 atusb->data = &atusb_chip_data;
759 break;
760 case ATUSB_HW_TYPE_HULUSB:
761 hw_name = "HULUSB";
762 atusb->data = &hulusb_chip_data;
763 break;
764 default:
765 hw_name = "UNKNOWN";
766 atusb->err = -ENOTSUPP;
767 ret = -ENOTSUPP;
768 break;
769 }
770
771 dev_info(&usb_dev->dev,
772 "Firmware: major: %u, minor: %u, hardware type: %s (%d)\n",
773 atusb->fw_ver_maj, atusb->fw_ver_min, hw_name,
774 atusb->fw_hw_type);
775 }
776 if (atusb->fw_ver_maj == 0 && atusb->fw_ver_min < 2) {
777 dev_info(&usb_dev->dev,
778 "Firmware version (%u.%u) predates our first public release.",
779 atusb->fw_ver_maj, atusb->fw_ver_min);
780 dev_info(&usb_dev->dev, "Please update to version 0.2 or newer");
781 }
782
783 return ret;
784 }
785
atusb_get_and_show_build(struct atusb * atusb)786 static int atusb_get_and_show_build(struct atusb *atusb)
787 {
788 struct usb_device *usb_dev = atusb->usb_dev;
789 char *build;
790 int ret;
791
792 build = kmalloc(ATUSB_BUILD_SIZE + 1, GFP_KERNEL);
793 if (!build)
794 return -ENOMEM;
795
796 ret = usb_control_msg(atusb->usb_dev, usb_rcvctrlpipe(usb_dev, 0), ATUSB_BUILD,
797 ATUSB_REQ_FROM_DEV, 0, 0, build, ATUSB_BUILD_SIZE, 1000);
798 if (ret >= 0) {
799 build[ret] = 0;
800 dev_info(&usb_dev->dev, "Firmware: build %s\n", build);
801 }
802
803 kfree(build);
804 return ret;
805 }
806
atusb_get_and_conf_chip(struct atusb * atusb)807 static int atusb_get_and_conf_chip(struct atusb *atusb)
808 {
809 struct usb_device *usb_dev = atusb->usb_dev;
810 u8 man_id_0, man_id_1, part_num, version_num;
811 const char *chip;
812 struct ieee802154_hw *hw = atusb->hw;
813 int ret;
814
815 ret = usb_control_msg_recv(usb_dev, 0, ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
816 0, RG_MAN_ID_0, &man_id_0, 1, 1000, GFP_KERNEL);
817 if (ret < 0)
818 return ret;
819
820 ret = usb_control_msg_recv(usb_dev, 0, ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
821 0, RG_MAN_ID_1, &man_id_1, 1, 1000, GFP_KERNEL);
822 if (ret < 0)
823 return ret;
824
825 ret = usb_control_msg_recv(usb_dev, 0, ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
826 0, RG_PART_NUM, &part_num, 1, 1000, GFP_KERNEL);
827 if (ret < 0)
828 return ret;
829
830 ret = usb_control_msg_recv(usb_dev, 0, ATUSB_REG_READ, ATUSB_REQ_FROM_DEV,
831 0, RG_VERSION_NUM, &version_num, 1, 1000, GFP_KERNEL);
832 if (ret < 0)
833 return ret;
834
835 hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
836 IEEE802154_HW_PROMISCUOUS | IEEE802154_HW_CSMA_PARAMS;
837
838 hw->phy->flags = WPAN_PHY_FLAG_TXPOWER | WPAN_PHY_FLAG_CCA_ED_LEVEL |
839 WPAN_PHY_FLAG_CCA_MODE;
840
841 hw->phy->supported.cca_modes = BIT(NL802154_CCA_ENERGY) |
842 BIT(NL802154_CCA_CARRIER) |
843 BIT(NL802154_CCA_ENERGY_CARRIER);
844 hw->phy->supported.cca_opts = BIT(NL802154_CCA_OPT_ENERGY_CARRIER_AND) |
845 BIT(NL802154_CCA_OPT_ENERGY_CARRIER_OR);
846
847 hw->phy->cca.mode = NL802154_CCA_ENERGY;
848
849 hw->phy->current_page = 0;
850
851 if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) {
852 dev_err(&usb_dev->dev,
853 "non-Atmel transceiver xxxx%02x%02x\n",
854 man_id_1, man_id_0);
855 goto fail;
856 }
857
858 switch (part_num) {
859 case 2:
860 chip = "AT86RF230";
861 atusb->hw->phy->supported.channels[0] = 0x7FFF800;
862 atusb->hw->phy->current_channel = 11; /* reset default */
863 atusb->hw->phy->supported.tx_powers = atusb_powers;
864 atusb->hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
865 hw->phy->supported.cca_ed_levels = atusb_ed_levels;
866 hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(atusb_ed_levels);
867 break;
868 case 3:
869 chip = "AT86RF231";
870 atusb->hw->phy->supported.channels[0] = 0x7FFF800;
871 atusb->hw->phy->current_channel = 11; /* reset default */
872 atusb->hw->phy->supported.tx_powers = atusb_powers;
873 atusb->hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers);
874 hw->phy->supported.cca_ed_levels = atusb_ed_levels;
875 hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(atusb_ed_levels);
876 break;
877 case 7:
878 chip = "AT86RF212";
879 atusb->hw->flags |= IEEE802154_HW_LBT;
880 atusb->hw->phy->supported.channels[0] = 0x00007FF;
881 atusb->hw->phy->supported.channels[2] = 0x00007FF;
882 atusb->hw->phy->current_channel = 5;
883 atusb->hw->phy->supported.lbt = NL802154_SUPPORTED_BOOL_BOTH;
884 atusb->hw->phy->supported.tx_powers = at86rf212_powers;
885 atusb->hw->phy->supported.tx_powers_size = ARRAY_SIZE(at86rf212_powers);
886 atusb->hw->phy->supported.cca_ed_levels = at86rf212_ed_levels_100;
887 atusb->hw->phy->supported.cca_ed_levels_size = ARRAY_SIZE(at86rf212_ed_levels_100);
888 break;
889 default:
890 dev_err(&usb_dev->dev,
891 "unexpected transceiver, part 0x%02x version 0x%02x\n",
892 part_num, version_num);
893 goto fail;
894 }
895
896 hw->phy->transmit_power = hw->phy->supported.tx_powers[0];
897 hw->phy->cca_ed_level = hw->phy->supported.cca_ed_levels[7];
898
899 dev_info(&usb_dev->dev, "ATUSB: %s version %d\n", chip, version_num);
900
901 return 0;
902
903 fail:
904 atusb->err = -ENODEV;
905 return -ENODEV;
906 }
907
atusb_set_extended_addr(struct atusb * atusb)908 static int atusb_set_extended_addr(struct atusb *atusb)
909 {
910 struct usb_device *usb_dev = atusb->usb_dev;
911 unsigned char buffer[IEEE802154_EXTENDED_ADDR_LEN];
912 __le64 extended_addr;
913 u64 addr;
914 int ret;
915
916 /* Firmware versions before 0.3 do not support the EUI64_READ command.
917 * Just use a random address and be done.
918 */
919 if (atusb->fw_ver_maj == 0 && atusb->fw_ver_min < 3) {
920 ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
921 return 0;
922 }
923
924 /* Firmware is new enough so we fetch the address from EEPROM */
925 ret = usb_control_msg_recv(atusb->usb_dev, 0, ATUSB_EUI64_READ, ATUSB_REQ_FROM_DEV, 0, 0,
926 buffer, IEEE802154_EXTENDED_ADDR_LEN, 1000, GFP_KERNEL);
927 if (ret < 0) {
928 dev_err(&usb_dev->dev, "failed to fetch extended address, random address set\n");
929 ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
930 return ret;
931 }
932
933 memcpy(&extended_addr, buffer, IEEE802154_EXTENDED_ADDR_LEN);
934 /* Check if read address is not empty and the unicast bit is set correctly */
935 if (!ieee802154_is_valid_extended_unicast_addr(extended_addr)) {
936 dev_info(&usb_dev->dev, "no permanent extended address found, random address set\n");
937 ieee802154_random_extended_addr(&atusb->hw->phy->perm_extended_addr);
938 } else {
939 atusb->hw->phy->perm_extended_addr = extended_addr;
940 addr = swab64((__force u64)atusb->hw->phy->perm_extended_addr);
941 dev_info(&usb_dev->dev, "Read permanent extended address %8phC from device\n",
942 &addr);
943 }
944
945 return ret;
946 }
947
948 /* ----- Setup ------------------------------------------------------------- */
949
atusb_probe(struct usb_interface * interface,const struct usb_device_id * id)950 static int atusb_probe(struct usb_interface *interface,
951 const struct usb_device_id *id)
952 {
953 struct usb_device *usb_dev = interface_to_usbdev(interface);
954 struct ieee802154_hw *hw;
955 struct atusb *atusb = NULL;
956 int ret = -ENOMEM;
957
958 hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops);
959 if (!hw)
960 return -ENOMEM;
961
962 atusb = hw->priv;
963 atusb->hw = hw;
964 atusb->usb_dev = usb_get_dev(usb_dev);
965 usb_set_intfdata(interface, atusb);
966
967 atusb->shutdown = 0;
968 atusb->err = 0;
969 INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs);
970 init_usb_anchor(&atusb->idle_urbs);
971 init_usb_anchor(&atusb->rx_urbs);
972
973 if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS))
974 goto fail;
975
976 atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV;
977 atusb->tx_dr.bRequest = ATUSB_TX;
978 atusb->tx_dr.wValue = cpu_to_le16(0);
979
980 atusb->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
981 if (!atusb->tx_urb)
982 goto fail;
983
984 hw->parent = &usb_dev->dev;
985
986 usb_control_msg_send(atusb->usb_dev, 0, ATUSB_RF_RESET, ATUSB_REQ_TO_DEV, 0, 0,
987 NULL, 0, 1000, GFP_KERNEL);
988 atusb_get_and_conf_chip(atusb);
989 atusb_get_and_show_revision(atusb);
990 atusb_get_and_show_build(atusb);
991 atusb_set_extended_addr(atusb);
992
993 if ((atusb->fw_ver_maj == 0 && atusb->fw_ver_min >= 3) || atusb->fw_ver_maj > 0)
994 hw->flags |= IEEE802154_HW_FRAME_RETRIES;
995
996 ret = atusb_get_and_clear_error(atusb);
997 if (ret) {
998 dev_err(&atusb->usb_dev->dev,
999 "%s: initialization failed, error = %d\n",
1000 __func__, ret);
1001 goto fail;
1002 }
1003
1004 ret = ieee802154_register_hw(hw);
1005 if (ret)
1006 goto fail;
1007
1008 /* If we just powered on, we're now in P_ON and need to enter TRX_OFF
1009 * explicitly. Any resets after that will send us straight to TRX_OFF,
1010 * making the command below redundant.
1011 */
1012 usb_control_msg_send(atusb->usb_dev, 0, ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
1013 STATE_FORCE_TRX_OFF, RG_TRX_STATE, NULL, 0, 1000, GFP_KERNEL);
1014
1015 msleep(1); /* reset => TRX_OFF, tTR13 = 37 us */
1016
1017 #if 0
1018 /* Calculating the maximum time available to empty the frame buffer
1019 * on reception:
1020 *
1021 * According to [1], the inter-frame gap is
1022 * R * 20 * 16 us + 128 us
1023 * where R is a random number from 0 to 7. Furthermore, we have 20 bit
1024 * times (80 us at 250 kbps) of SHR of the next frame before the
1025 * transceiver begins storing data in the frame buffer.
1026 *
1027 * This yields a minimum time of 208 us between the last data of a
1028 * frame and the first data of the next frame. This time is further
1029 * reduced by interrupt latency in the atusb firmware.
1030 *
1031 * atusb currently needs about 500 us to retrieve a maximum-sized
1032 * frame. We therefore have to allow reception of a new frame to begin
1033 * while we retrieve the previous frame.
1034 *
1035 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based
1036 * network", Jennic 2006.
1037 * http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf
1038 */
1039
1040 atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1);
1041 #endif
1042 usb_control_msg_send(atusb->usb_dev, 0, ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV,
1043 0xff, RG_IRQ_MASK, NULL, 0, 1000, GFP_KERNEL);
1044
1045 ret = atusb_get_and_clear_error(atusb);
1046 if (!ret)
1047 return 0;
1048
1049 dev_err(&atusb->usb_dev->dev,
1050 "%s: setup failed, error = %d\n",
1051 __func__, ret);
1052
1053 ieee802154_unregister_hw(hw);
1054 fail:
1055 atusb_free_urbs(atusb);
1056 usb_kill_urb(atusb->tx_urb);
1057 usb_free_urb(atusb->tx_urb);
1058 usb_put_dev(usb_dev);
1059 ieee802154_free_hw(hw);
1060 return ret;
1061 }
1062
atusb_disconnect(struct usb_interface * interface)1063 static void atusb_disconnect(struct usb_interface *interface)
1064 {
1065 struct atusb *atusb = usb_get_intfdata(interface);
1066
1067 dev_dbg(&atusb->usb_dev->dev, "%s\n", __func__);
1068
1069 atusb->shutdown = 1;
1070 cancel_delayed_work_sync(&atusb->work);
1071
1072 usb_kill_anchored_urbs(&atusb->rx_urbs);
1073 atusb_free_urbs(atusb);
1074 usb_kill_urb(atusb->tx_urb);
1075 usb_free_urb(atusb->tx_urb);
1076
1077 ieee802154_unregister_hw(atusb->hw);
1078
1079 usb_put_dev(atusb->usb_dev);
1080
1081 ieee802154_free_hw(atusb->hw);
1082
1083 usb_set_intfdata(interface, NULL);
1084
1085 pr_debug("%s done\n", __func__);
1086 }
1087
1088 /* The devices we work with */
1089 static const struct usb_device_id atusb_device_table[] = {
1090 {
1091 .match_flags = USB_DEVICE_ID_MATCH_DEVICE |
1092 USB_DEVICE_ID_MATCH_INT_INFO,
1093 .idVendor = ATUSB_VENDOR_ID,
1094 .idProduct = ATUSB_PRODUCT_ID,
1095 .bInterfaceClass = USB_CLASS_VENDOR_SPEC
1096 },
1097 /* end with null element */
1098 {}
1099 };
1100 MODULE_DEVICE_TABLE(usb, atusb_device_table);
1101
1102 static struct usb_driver atusb_driver = {
1103 .name = "atusb",
1104 .probe = atusb_probe,
1105 .disconnect = atusb_disconnect,
1106 .id_table = atusb_device_table,
1107 };
1108 module_usb_driver(atusb_driver);
1109
1110 MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>");
1111 MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>");
1112 MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>");
1113 MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>");
1114 MODULE_AUTHOR("Josef Filzmaier <j.filzmaier@gmx.at>");
1115 MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver");
1116 MODULE_LICENSE("GPL");
1117