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