1 /* 2 * atusb.c - Driver for the ATUSB IEEE 802.15.4 dongle 3 * 4 * Written 2013 by Werner Almesberger <werner@almesberger.net> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation, version 2 9 * 10 * Based on at86rf230.c and spi_atusb.c. 11 * at86rf230.c is 12 * Copyright (C) 2009 Siemens AG 13 * Written by: Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com> 14 * 15 * spi_atusb.c is 16 * Copyright (c) 2011 Richard Sharpe <realrichardsharpe@gmail.com> 17 * Copyright (c) 2011 Stefan Schmidt <stefan@datenfreihafen.org> 18 * Copyright (c) 2011 Werner Almesberger <werner@almesberger.net> 19 * 20 * USB initialization is 21 * Copyright (c) 2013 Alexander Aring <alex.aring@gmail.com> 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/slab.h> 26 #include <linux/module.h> 27 #include <linux/jiffies.h> 28 #include <linux/usb.h> 29 #include <linux/skbuff.h> 30 31 #include <net/cfg802154.h> 32 #include <net/mac802154.h> 33 34 #include "at86rf230.h" 35 #include "atusb.h" 36 37 #define ATUSB_JEDEC_ATMEL 0x1f /* JEDEC manufacturer ID */ 38 39 #define ATUSB_NUM_RX_URBS 4 /* allow for a bit of local latency */ 40 #define ATUSB_ALLOC_DELAY_MS 100 /* delay after failed allocation */ 41 #define ATUSB_TX_TIMEOUT_MS 200 /* on the air timeout */ 42 43 struct atusb { 44 struct ieee802154_hw *hw; 45 struct usb_device *usb_dev; 46 int shutdown; /* non-zero if shutting down */ 47 int err; /* set by first error */ 48 49 /* RX variables */ 50 struct delayed_work work; /* memory allocations */ 51 struct usb_anchor idle_urbs; /* URBs waiting to be submitted */ 52 struct usb_anchor rx_urbs; /* URBs waiting for reception */ 53 54 /* TX variables */ 55 struct usb_ctrlrequest tx_dr; 56 struct urb *tx_urb; 57 struct sk_buff *tx_skb; 58 uint8_t tx_ack_seq; /* current TX ACK sequence number */ 59 }; 60 61 /* ----- USB commands without data ----------------------------------------- */ 62 63 /* To reduce the number of error checks in the code, we record the first error 64 * in atusb->err and reject all subsequent requests until the error is cleared. 65 */ 66 67 static int atusb_control_msg(struct atusb *atusb, unsigned int pipe, 68 __u8 request, __u8 requesttype, 69 __u16 value, __u16 index, 70 void *data, __u16 size, int timeout) 71 { 72 struct usb_device *usb_dev = atusb->usb_dev; 73 int ret; 74 75 if (atusb->err) 76 return atusb->err; 77 78 ret = usb_control_msg(usb_dev, pipe, request, requesttype, 79 value, index, data, size, timeout); 80 if (ret < 0) { 81 atusb->err = ret; 82 dev_err(&usb_dev->dev, 83 "atusb_control_msg: req 0x%02x val 0x%x idx 0x%x, error %d\n", 84 request, value, index, ret); 85 } 86 return ret; 87 } 88 89 static int atusb_command(struct atusb *atusb, uint8_t cmd, uint8_t arg) 90 { 91 struct usb_device *usb_dev = atusb->usb_dev; 92 93 dev_dbg(&usb_dev->dev, "atusb_command: cmd = 0x%x\n", cmd); 94 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0), 95 cmd, ATUSB_REQ_TO_DEV, arg, 0, NULL, 0, 1000); 96 } 97 98 static int atusb_write_reg(struct atusb *atusb, uint8_t reg, uint8_t value) 99 { 100 struct usb_device *usb_dev = atusb->usb_dev; 101 102 dev_dbg(&usb_dev->dev, "atusb_write_reg: 0x%02x <- 0x%02x\n", 103 reg, value); 104 return atusb_control_msg(atusb, usb_sndctrlpipe(usb_dev, 0), 105 ATUSB_REG_WRITE, ATUSB_REQ_TO_DEV, 106 value, reg, NULL, 0, 1000); 107 } 108 109 static int atusb_read_reg(struct atusb *atusb, uint8_t reg) 110 { 111 struct usb_device *usb_dev = atusb->usb_dev; 112 int ret; 113 uint8_t value; 114 115 dev_dbg(&usb_dev->dev, "atusb: reg = 0x%x\n", reg); 116 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0), 117 ATUSB_REG_READ, ATUSB_REQ_FROM_DEV, 118 0, reg, &value, 1, 1000); 119 return ret >= 0 ? value : ret; 120 } 121 122 static int atusb_write_subreg(struct atusb *atusb, uint8_t reg, uint8_t mask, 123 uint8_t shift, uint8_t value) 124 { 125 struct usb_device *usb_dev = atusb->usb_dev; 126 uint8_t orig, tmp; 127 int ret = 0; 128 129 dev_dbg(&usb_dev->dev, "atusb_write_subreg: 0x%02x <- 0x%02x\n", 130 reg, value); 131 132 orig = atusb_read_reg(atusb, reg); 133 134 /* Write the value only into that part of the register which is allowed 135 * by the mask. All other bits stay as before. 136 */ 137 tmp = orig & ~mask; 138 tmp |= (value << shift) & mask; 139 140 if (tmp != orig) 141 ret = atusb_write_reg(atusb, reg, tmp); 142 143 return ret; 144 } 145 146 static int atusb_get_and_clear_error(struct atusb *atusb) 147 { 148 int err = atusb->err; 149 150 atusb->err = 0; 151 return err; 152 } 153 154 /* ----- skb allocation ---------------------------------------------------- */ 155 156 #define MAX_PSDU 127 157 #define MAX_RX_XFER (1 + MAX_PSDU + 2 + 1) /* PHR+PSDU+CRC+LQI */ 158 159 #define SKB_ATUSB(skb) (*(struct atusb **)(skb)->cb) 160 161 static void atusb_in(struct urb *urb); 162 163 static int atusb_submit_rx_urb(struct atusb *atusb, struct urb *urb) 164 { 165 struct usb_device *usb_dev = atusb->usb_dev; 166 struct sk_buff *skb = urb->context; 167 int ret; 168 169 if (!skb) { 170 skb = alloc_skb(MAX_RX_XFER, GFP_KERNEL); 171 if (!skb) { 172 dev_warn_ratelimited(&usb_dev->dev, 173 "atusb_in: can't allocate skb\n"); 174 return -ENOMEM; 175 } 176 skb_put(skb, MAX_RX_XFER); 177 SKB_ATUSB(skb) = atusb; 178 } 179 180 usb_fill_bulk_urb(urb, usb_dev, usb_rcvbulkpipe(usb_dev, 1), 181 skb->data, MAX_RX_XFER, atusb_in, skb); 182 usb_anchor_urb(urb, &atusb->rx_urbs); 183 184 ret = usb_submit_urb(urb, GFP_KERNEL); 185 if (ret) { 186 usb_unanchor_urb(urb); 187 kfree_skb(skb); 188 urb->context = NULL; 189 } 190 return ret; 191 } 192 193 static void atusb_work_urbs(struct work_struct *work) 194 { 195 struct atusb *atusb = 196 container_of(to_delayed_work(work), struct atusb, work); 197 struct usb_device *usb_dev = atusb->usb_dev; 198 struct urb *urb; 199 int ret; 200 201 if (atusb->shutdown) 202 return; 203 204 do { 205 urb = usb_get_from_anchor(&atusb->idle_urbs); 206 if (!urb) 207 return; 208 ret = atusb_submit_rx_urb(atusb, urb); 209 } while (!ret); 210 211 usb_anchor_urb(urb, &atusb->idle_urbs); 212 dev_warn_ratelimited(&usb_dev->dev, 213 "atusb_in: can't allocate/submit URB (%d)\n", ret); 214 schedule_delayed_work(&atusb->work, 215 msecs_to_jiffies(ATUSB_ALLOC_DELAY_MS) + 1); 216 } 217 218 /* ----- Asynchronous USB -------------------------------------------------- */ 219 220 static void atusb_tx_done(struct atusb *atusb, uint8_t seq) 221 { 222 struct usb_device *usb_dev = atusb->usb_dev; 223 uint8_t expect = atusb->tx_ack_seq; 224 225 dev_dbg(&usb_dev->dev, "atusb_tx_done (0x%02x/0x%02x)\n", seq, expect); 226 if (seq == expect) { 227 /* TODO check for ifs handling in firmware */ 228 ieee802154_xmit_complete(atusb->hw, atusb->tx_skb, false); 229 } else { 230 /* TODO I experience this case when atusb has a tx complete 231 * irq before probing, we should fix the firmware it's an 232 * unlikely case now that seq == expect is then true, but can 233 * happen and fail with a tx_skb = NULL; 234 */ 235 ieee802154_wake_queue(atusb->hw); 236 if (atusb->tx_skb) 237 dev_kfree_skb_irq(atusb->tx_skb); 238 } 239 } 240 241 static void atusb_in_good(struct urb *urb) 242 { 243 struct usb_device *usb_dev = urb->dev; 244 struct sk_buff *skb = urb->context; 245 struct atusb *atusb = SKB_ATUSB(skb); 246 uint8_t len, lqi; 247 248 if (!urb->actual_length) { 249 dev_dbg(&usb_dev->dev, "atusb_in: zero-sized URB ?\n"); 250 return; 251 } 252 253 len = *skb->data; 254 255 if (urb->actual_length == 1) { 256 atusb_tx_done(atusb, len); 257 return; 258 } 259 260 if (len + 1 > urb->actual_length - 1) { 261 dev_dbg(&usb_dev->dev, "atusb_in: frame len %d+1 > URB %u-1\n", 262 len, urb->actual_length); 263 return; 264 } 265 266 if (!ieee802154_is_valid_psdu_len(len)) { 267 dev_dbg(&usb_dev->dev, "atusb_in: frame corrupted\n"); 268 return; 269 } 270 271 lqi = skb->data[len + 1]; 272 dev_dbg(&usb_dev->dev, "atusb_in: rx len %d lqi 0x%02x\n", len, lqi); 273 skb_pull(skb, 1); /* remove PHR */ 274 skb_trim(skb, len); /* get payload only */ 275 ieee802154_rx_irqsafe(atusb->hw, skb, lqi); 276 urb->context = NULL; /* skb is gone */ 277 } 278 279 static void atusb_in(struct urb *urb) 280 { 281 struct usb_device *usb_dev = urb->dev; 282 struct sk_buff *skb = urb->context; 283 struct atusb *atusb = SKB_ATUSB(skb); 284 285 dev_dbg(&usb_dev->dev, "atusb_in: status %d len %d\n", 286 urb->status, urb->actual_length); 287 if (urb->status) { 288 if (urb->status == -ENOENT) { /* being killed */ 289 kfree_skb(skb); 290 urb->context = NULL; 291 return; 292 } 293 dev_dbg(&usb_dev->dev, "atusb_in: URB error %d\n", urb->status); 294 } else { 295 atusb_in_good(urb); 296 } 297 298 usb_anchor_urb(urb, &atusb->idle_urbs); 299 if (!atusb->shutdown) 300 schedule_delayed_work(&atusb->work, 0); 301 } 302 303 /* ----- URB allocation/deallocation --------------------------------------- */ 304 305 static void atusb_free_urbs(struct atusb *atusb) 306 { 307 struct urb *urb; 308 309 while (1) { 310 urb = usb_get_from_anchor(&atusb->idle_urbs); 311 if (!urb) 312 break; 313 if (urb->context) 314 kfree_skb(urb->context); 315 usb_free_urb(urb); 316 } 317 } 318 319 static int atusb_alloc_urbs(struct atusb *atusb, int n) 320 { 321 struct urb *urb; 322 323 while (n) { 324 urb = usb_alloc_urb(0, GFP_KERNEL); 325 if (!urb) { 326 atusb_free_urbs(atusb); 327 return -ENOMEM; 328 } 329 usb_anchor_urb(urb, &atusb->idle_urbs); 330 n--; 331 } 332 return 0; 333 } 334 335 /* ----- IEEE 802.15.4 interface operations -------------------------------- */ 336 337 static void atusb_xmit_complete(struct urb *urb) 338 { 339 dev_dbg(&urb->dev->dev, "atusb_xmit urb completed"); 340 } 341 342 static int atusb_xmit(struct ieee802154_hw *hw, struct sk_buff *skb) 343 { 344 struct atusb *atusb = hw->priv; 345 struct usb_device *usb_dev = atusb->usb_dev; 346 int ret; 347 348 dev_dbg(&usb_dev->dev, "atusb_xmit (%d)\n", skb->len); 349 atusb->tx_skb = skb; 350 atusb->tx_ack_seq++; 351 atusb->tx_dr.wIndex = cpu_to_le16(atusb->tx_ack_seq); 352 atusb->tx_dr.wLength = cpu_to_le16(skb->len); 353 354 usb_fill_control_urb(atusb->tx_urb, usb_dev, 355 usb_sndctrlpipe(usb_dev, 0), 356 (unsigned char *)&atusb->tx_dr, skb->data, 357 skb->len, atusb_xmit_complete, NULL); 358 ret = usb_submit_urb(atusb->tx_urb, GFP_ATOMIC); 359 dev_dbg(&usb_dev->dev, "atusb_xmit done (%d)\n", ret); 360 return ret; 361 } 362 363 static int atusb_channel(struct ieee802154_hw *hw, u8 page, u8 channel) 364 { 365 struct atusb *atusb = hw->priv; 366 int ret; 367 368 /* This implicitly sets the CCA (Clear Channel Assessment) mode to 0, 369 * "Mode 3a, Carrier sense OR energy above threshold". 370 * We should probably make this configurable. @@@ 371 */ 372 ret = atusb_write_reg(atusb, RG_PHY_CC_CCA, channel); 373 if (ret < 0) 374 return ret; 375 msleep(1); /* @@@ ugly synchronization */ 376 return 0; 377 } 378 379 static int atusb_ed(struct ieee802154_hw *hw, u8 *level) 380 { 381 BUG_ON(!level); 382 *level = 0xbe; 383 return 0; 384 } 385 386 static int atusb_set_hw_addr_filt(struct ieee802154_hw *hw, 387 struct ieee802154_hw_addr_filt *filt, 388 unsigned long changed) 389 { 390 struct atusb *atusb = hw->priv; 391 struct device *dev = &atusb->usb_dev->dev; 392 393 if (changed & IEEE802154_AFILT_SADDR_CHANGED) { 394 u16 addr = le16_to_cpu(filt->short_addr); 395 396 dev_vdbg(dev, "atusb_set_hw_addr_filt called for saddr\n"); 397 atusb_write_reg(atusb, RG_SHORT_ADDR_0, addr); 398 atusb_write_reg(atusb, RG_SHORT_ADDR_1, addr >> 8); 399 } 400 401 if (changed & IEEE802154_AFILT_PANID_CHANGED) { 402 u16 pan = le16_to_cpu(filt->pan_id); 403 404 dev_vdbg(dev, "atusb_set_hw_addr_filt called for pan id\n"); 405 atusb_write_reg(atusb, RG_PAN_ID_0, pan); 406 atusb_write_reg(atusb, RG_PAN_ID_1, pan >> 8); 407 } 408 409 if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) { 410 u8 i, addr[IEEE802154_EXTENDED_ADDR_LEN]; 411 412 memcpy(addr, &filt->ieee_addr, IEEE802154_EXTENDED_ADDR_LEN); 413 dev_vdbg(dev, "atusb_set_hw_addr_filt called for IEEE addr\n"); 414 for (i = 0; i < 8; i++) 415 atusb_write_reg(atusb, RG_IEEE_ADDR_0 + i, addr[i]); 416 } 417 418 if (changed & IEEE802154_AFILT_PANC_CHANGED) { 419 dev_vdbg(dev, 420 "atusb_set_hw_addr_filt called for panc change\n"); 421 if (filt->pan_coord) 422 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 1); 423 else 424 atusb_write_subreg(atusb, SR_AACK_I_AM_COORD, 0); 425 } 426 427 return atusb_get_and_clear_error(atusb); 428 } 429 430 static int atusb_start(struct ieee802154_hw *hw) 431 { 432 struct atusb *atusb = hw->priv; 433 struct usb_device *usb_dev = atusb->usb_dev; 434 int ret; 435 436 dev_dbg(&usb_dev->dev, "atusb_start\n"); 437 schedule_delayed_work(&atusb->work, 0); 438 atusb_command(atusb, ATUSB_RX_MODE, 1); 439 ret = atusb_get_and_clear_error(atusb); 440 if (ret < 0) 441 usb_kill_anchored_urbs(&atusb->idle_urbs); 442 return ret; 443 } 444 445 static void atusb_stop(struct ieee802154_hw *hw) 446 { 447 struct atusb *atusb = hw->priv; 448 struct usb_device *usb_dev = atusb->usb_dev; 449 450 dev_dbg(&usb_dev->dev, "atusb_stop\n"); 451 usb_kill_anchored_urbs(&atusb->idle_urbs); 452 atusb_command(atusb, ATUSB_RX_MODE, 0); 453 atusb_get_and_clear_error(atusb); 454 } 455 456 #define ATUSB_MAX_TX_POWERS 0xF 457 static const s32 atusb_powers[ATUSB_MAX_TX_POWERS + 1] = { 458 300, 280, 230, 180, 130, 70, 0, -100, -200, -300, -400, -500, -700, 459 -900, -1200, -1700, 460 }; 461 462 static int 463 atusb_set_txpower(struct ieee802154_hw *hw, s32 mbm) 464 { 465 struct atusb *atusb = hw->priv; 466 u32 i; 467 468 for (i = 0; i < hw->phy->supported.tx_powers_size; i++) { 469 if (hw->phy->supported.tx_powers[i] == mbm) 470 return atusb_write_subreg(atusb, SR_TX_PWR_23X, i); 471 } 472 473 return -EINVAL; 474 } 475 476 static int 477 atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on) 478 { 479 struct atusb *atusb = hw->priv; 480 int ret; 481 482 if (on) { 483 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 1); 484 if (ret < 0) 485 return ret; 486 487 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 1); 488 if (ret < 0) 489 return ret; 490 } else { 491 ret = atusb_write_subreg(atusb, SR_AACK_PROM_MODE, 0); 492 if (ret < 0) 493 return ret; 494 495 ret = atusb_write_subreg(atusb, SR_AACK_DIS_ACK, 0); 496 if (ret < 0) 497 return ret; 498 } 499 500 return 0; 501 } 502 503 static struct ieee802154_ops atusb_ops = { 504 .owner = THIS_MODULE, 505 .xmit_async = atusb_xmit, 506 .ed = atusb_ed, 507 .set_channel = atusb_channel, 508 .start = atusb_start, 509 .stop = atusb_stop, 510 .set_hw_addr_filt = atusb_set_hw_addr_filt, 511 .set_txpower = atusb_set_txpower, 512 .set_promiscuous_mode = atusb_set_promiscuous_mode, 513 }; 514 515 /* ----- Firmware and chip version information ----------------------------- */ 516 517 static int atusb_get_and_show_revision(struct atusb *atusb) 518 { 519 struct usb_device *usb_dev = atusb->usb_dev; 520 unsigned char buffer[3]; 521 int ret; 522 523 /* Get a couple of the ATMega Firmware values */ 524 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0), 525 ATUSB_ID, ATUSB_REQ_FROM_DEV, 0, 0, 526 buffer, 3, 1000); 527 if (ret >= 0) 528 dev_info(&usb_dev->dev, 529 "Firmware: major: %u, minor: %u, hardware type: %u\n", 530 buffer[0], buffer[1], buffer[2]); 531 if (buffer[0] == 0 && buffer[1] < 2) { 532 dev_info(&usb_dev->dev, 533 "Firmware version (%u.%u) is predates our first public release.", 534 buffer[0], buffer[1]); 535 dev_info(&usb_dev->dev, "Please update to version 0.2 or newer"); 536 } 537 538 return ret; 539 } 540 541 static int atusb_get_and_show_build(struct atusb *atusb) 542 { 543 struct usb_device *usb_dev = atusb->usb_dev; 544 char build[ATUSB_BUILD_SIZE + 1]; 545 int ret; 546 547 ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0), 548 ATUSB_BUILD, ATUSB_REQ_FROM_DEV, 0, 0, 549 build, ATUSB_BUILD_SIZE, 1000); 550 if (ret >= 0) { 551 build[ret] = 0; 552 dev_info(&usb_dev->dev, "Firmware: build %s\n", build); 553 } 554 555 return ret; 556 } 557 558 static int atusb_get_and_show_chip(struct atusb *atusb) 559 { 560 struct usb_device *usb_dev = atusb->usb_dev; 561 uint8_t man_id_0, man_id_1, part_num, version_num; 562 const char *chip; 563 564 man_id_0 = atusb_read_reg(atusb, RG_MAN_ID_0); 565 man_id_1 = atusb_read_reg(atusb, RG_MAN_ID_1); 566 part_num = atusb_read_reg(atusb, RG_PART_NUM); 567 version_num = atusb_read_reg(atusb, RG_VERSION_NUM); 568 569 if (atusb->err) 570 return atusb->err; 571 572 if ((man_id_1 << 8 | man_id_0) != ATUSB_JEDEC_ATMEL) { 573 dev_err(&usb_dev->dev, 574 "non-Atmel transceiver xxxx%02x%02x\n", 575 man_id_1, man_id_0); 576 goto fail; 577 } 578 579 switch (part_num) { 580 case 2: 581 chip = "AT86RF230"; 582 break; 583 case 3: 584 chip = "AT86RF231"; 585 break; 586 default: 587 dev_err(&usb_dev->dev, 588 "unexpected transceiver, part 0x%02x version 0x%02x\n", 589 part_num, version_num); 590 goto fail; 591 } 592 593 dev_info(&usb_dev->dev, "ATUSB: %s version %d\n", chip, version_num); 594 595 return 0; 596 597 fail: 598 atusb->err = -ENODEV; 599 return -ENODEV; 600 } 601 602 /* ----- Setup ------------------------------------------------------------- */ 603 604 static int atusb_probe(struct usb_interface *interface, 605 const struct usb_device_id *id) 606 { 607 struct usb_device *usb_dev = interface_to_usbdev(interface); 608 struct ieee802154_hw *hw; 609 struct atusb *atusb = NULL; 610 int ret = -ENOMEM; 611 612 hw = ieee802154_alloc_hw(sizeof(struct atusb), &atusb_ops); 613 if (!hw) 614 return -ENOMEM; 615 616 atusb = hw->priv; 617 atusb->hw = hw; 618 atusb->usb_dev = usb_get_dev(usb_dev); 619 usb_set_intfdata(interface, atusb); 620 621 atusb->shutdown = 0; 622 atusb->err = 0; 623 INIT_DELAYED_WORK(&atusb->work, atusb_work_urbs); 624 init_usb_anchor(&atusb->idle_urbs); 625 init_usb_anchor(&atusb->rx_urbs); 626 627 if (atusb_alloc_urbs(atusb, ATUSB_NUM_RX_URBS)) 628 goto fail; 629 630 atusb->tx_dr.bRequestType = ATUSB_REQ_TO_DEV; 631 atusb->tx_dr.bRequest = ATUSB_TX; 632 atusb->tx_dr.wValue = cpu_to_le16(0); 633 634 atusb->tx_urb = usb_alloc_urb(0, GFP_ATOMIC); 635 if (!atusb->tx_urb) 636 goto fail; 637 638 hw->parent = &usb_dev->dev; 639 hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT | 640 IEEE802154_HW_PROMISCUOUS; 641 642 hw->phy->flags = WPAN_PHY_FLAG_TXPOWER; 643 644 hw->phy->current_page = 0; 645 hw->phy->current_channel = 11; /* reset default */ 646 hw->phy->supported.channels[0] = 0x7FFF800; 647 hw->phy->supported.tx_powers = atusb_powers; 648 hw->phy->supported.tx_powers_size = ARRAY_SIZE(atusb_powers); 649 hw->phy->transmit_power = hw->phy->supported.tx_powers[0]; 650 ieee802154_random_extended_addr(&hw->phy->perm_extended_addr); 651 652 atusb_command(atusb, ATUSB_RF_RESET, 0); 653 atusb_get_and_show_chip(atusb); 654 atusb_get_and_show_revision(atusb); 655 atusb_get_and_show_build(atusb); 656 ret = atusb_get_and_clear_error(atusb); 657 if (ret) { 658 dev_err(&atusb->usb_dev->dev, 659 "%s: initialization failed, error = %d\n", 660 __func__, ret); 661 goto fail; 662 } 663 664 ret = ieee802154_register_hw(hw); 665 if (ret) 666 goto fail; 667 668 /* If we just powered on, we're now in P_ON and need to enter TRX_OFF 669 * explicitly. Any resets after that will send us straight to TRX_OFF, 670 * making the command below redundant. 671 */ 672 atusb_write_reg(atusb, RG_TRX_STATE, STATE_FORCE_TRX_OFF); 673 msleep(1); /* reset => TRX_OFF, tTR13 = 37 us */ 674 675 #if 0 676 /* Calculating the maximum time available to empty the frame buffer 677 * on reception: 678 * 679 * According to [1], the inter-frame gap is 680 * R * 20 * 16 us + 128 us 681 * where R is a random number from 0 to 7. Furthermore, we have 20 bit 682 * times (80 us at 250 kbps) of SHR of the next frame before the 683 * transceiver begins storing data in the frame buffer. 684 * 685 * This yields a minimum time of 208 us between the last data of a 686 * frame and the first data of the next frame. This time is further 687 * reduced by interrupt latency in the atusb firmware. 688 * 689 * atusb currently needs about 500 us to retrieve a maximum-sized 690 * frame. We therefore have to allow reception of a new frame to begin 691 * while we retrieve the previous frame. 692 * 693 * [1] "JN-AN-1035 Calculating data rates in an IEEE 802.15.4-based 694 * network", Jennic 2006. 695 * http://www.jennic.com/download_file.php?supportFile=JN-AN-1035%20Calculating%20802-15-4%20Data%20Rates-1v0.pdf 696 */ 697 698 atusb_write_subreg(atusb, SR_RX_SAFE_MODE, 1); 699 #endif 700 atusb_write_reg(atusb, RG_IRQ_MASK, 0xff); 701 702 ret = atusb_get_and_clear_error(atusb); 703 if (!ret) 704 return 0; 705 706 dev_err(&atusb->usb_dev->dev, 707 "%s: setup failed, error = %d\n", 708 __func__, ret); 709 710 ieee802154_unregister_hw(hw); 711 fail: 712 atusb_free_urbs(atusb); 713 usb_kill_urb(atusb->tx_urb); 714 usb_free_urb(atusb->tx_urb); 715 usb_put_dev(usb_dev); 716 ieee802154_free_hw(hw); 717 return ret; 718 } 719 720 static void atusb_disconnect(struct usb_interface *interface) 721 { 722 struct atusb *atusb = usb_get_intfdata(interface); 723 724 dev_dbg(&atusb->usb_dev->dev, "atusb_disconnect\n"); 725 726 atusb->shutdown = 1; 727 cancel_delayed_work_sync(&atusb->work); 728 729 usb_kill_anchored_urbs(&atusb->rx_urbs); 730 atusb_free_urbs(atusb); 731 usb_kill_urb(atusb->tx_urb); 732 usb_free_urb(atusb->tx_urb); 733 734 ieee802154_unregister_hw(atusb->hw); 735 736 ieee802154_free_hw(atusb->hw); 737 738 usb_set_intfdata(interface, NULL); 739 usb_put_dev(atusb->usb_dev); 740 741 pr_debug("atusb_disconnect done\n"); 742 } 743 744 /* The devices we work with */ 745 static const struct usb_device_id atusb_device_table[] = { 746 { 747 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | 748 USB_DEVICE_ID_MATCH_INT_INFO, 749 .idVendor = ATUSB_VENDOR_ID, 750 .idProduct = ATUSB_PRODUCT_ID, 751 .bInterfaceClass = USB_CLASS_VENDOR_SPEC 752 }, 753 /* end with null element */ 754 {} 755 }; 756 MODULE_DEVICE_TABLE(usb, atusb_device_table); 757 758 static struct usb_driver atusb_driver = { 759 .name = "atusb", 760 .probe = atusb_probe, 761 .disconnect = atusb_disconnect, 762 .id_table = atusb_device_table, 763 }; 764 module_usb_driver(atusb_driver); 765 766 MODULE_AUTHOR("Alexander Aring <alex.aring@gmail.com>"); 767 MODULE_AUTHOR("Richard Sharpe <realrichardsharpe@gmail.com>"); 768 MODULE_AUTHOR("Stefan Schmidt <stefan@datenfreihafen.org>"); 769 MODULE_AUTHOR("Werner Almesberger <werner@almesberger.net>"); 770 MODULE_DESCRIPTION("ATUSB IEEE 802.15.4 Driver"); 771 MODULE_LICENSE("GPL"); 772