driver.c 21.5 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744
/*
 * Intel Wireless WiMAX Connection 2400m
 * Generic probe/disconnect, reset and message passing
 *
 *
 * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * See i2400m.h for driver documentation. This contains helpers for
 * the driver model glue [_setup()/_release()], handling device resets
 * [_dev_reset_handle()], and the backends for the WiMAX stack ops
 * reset [_op_reset()] and message from user [_op_msg_from_user()].
 *
 * ROADMAP:
 *
 * i2400m_op_msg_from_user()
 *   i2400m_msg_to_dev()
 *   wimax_msg_to_user_send()
 *
 * i2400m_op_reset()
 *   i240m->bus_reset()
 *
 * i2400m_dev_reset_handle()
 *   __i2400m_dev_reset_handle()
 *     __i2400m_dev_stop()
 *     __i2400m_dev_start()
 *
 * i2400m_setup()
 *   i2400m_bootrom_init()
 *   register_netdev()
 *   i2400m_dev_start()
 *     __i2400m_dev_start()
 *       i2400m_dev_bootstrap()
 *       i2400m_tx_setup()
 *       i2400m->bus_dev_start()
 *       i2400m_check_mac_addr()
 *   wimax_dev_add()
 *
 * i2400m_release()
 *   wimax_dev_rm()
 *   i2400m_dev_stop()
 *     __i2400m_dev_stop()
 *       i2400m_dev_shutdown()
 *       i2400m->bus_dev_stop()
 *       i2400m_tx_release()
 *   unregister_netdev()
 */
#include "i2400m.h"
#include <linux/wimax/i2400m.h>
#include <linux/module.h>
#include <linux/moduleparam.h>

#define D_SUBMODULE driver
#include "debug-levels.h"


int i2400m_idle_mode_disabled;	/* 0 (idle mode enabled) by default */
module_param_named(idle_mode_disabled, i2400m_idle_mode_disabled, int, 0644);
MODULE_PARM_DESC(idle_mode_disabled,
		 "If true, the device will not enable idle mode negotiation "
		 "with the base station (when connected) to save power.");

/**
 * i2400m_queue_work - schedule work on a i2400m's queue
 *
 * @i2400m: device descriptor
 *
 * @fn: function to run to execute work. It gets passed a 'struct
 *     work_struct' that is wrapped in a 'struct i2400m_work'. Once
 *     done, you have to (1) i2400m_put(i2400m_work->i2400m) and then
 *     (2) kfree(i2400m_work).
 *
 * @gfp_flags: GFP flags for memory allocation.
 *
 * @pl: pointer to a payload buffer that you want to pass to the _work
 *     function. Use this to pack (for example) a struct with extra
 *     arguments.
 *
 * @pl_size: size of the payload buffer.
 *
 * We do this quite often, so this just saves typing; allocate a
 * wrapper for a i2400m, get a ref to it, pack arguments and launch
 * the work.
 *
 * A usual workflow is:
 *
 * struct my_work_args {
 *         void *something;
 *         int whatever;
 * };
 * ...
 *
 * struct my_work_args my_args = {
 *         .something = FOO,
 *         .whaetever = BLAH
 * };
 * i2400m_queue_work(i2400m, 1, my_work_function, GFP_KERNEL,
 *                   &args, sizeof(args))
 *
 * And now the work function can unpack the arguments and call the
 * real function (or do the job itself):
 *
 * static
 * void my_work_fn((struct work_struct *ws)
 * {
 *         struct i2400m_work *iw =
 *	           container_of(ws, struct i2400m_work, ws);
 *	   struct my_work_args *my_args = (void *) iw->pl;
 *
 *	   my_work(iw->i2400m, my_args->something, my_args->whatevert);
 * }
 */
int i2400m_queue_work(struct i2400m *i2400m,
		      void (*fn)(struct work_struct *), gfp_t gfp_flags,
		      const void *pl, size_t pl_size)
{
	int result;
	struct i2400m_work *iw;

	BUG_ON(i2400m->work_queue == NULL);
	result = -ENOMEM;
	iw = kzalloc(sizeof(*iw) + pl_size, gfp_flags);
	if (iw == NULL)
		goto error_kzalloc;
	iw->i2400m = i2400m_get(i2400m);
	memcpy(iw->pl, pl, pl_size);
	INIT_WORK(&iw->ws, fn);
	result = queue_work(i2400m->work_queue, &iw->ws);
error_kzalloc:
	return result;
}
EXPORT_SYMBOL_GPL(i2400m_queue_work);


/*
 * Schedule i2400m's specific work on the system's queue.
 *
 * Used for a few cases where we really need it; otherwise, identical
 * to i2400m_queue_work().
 *
 * Returns < 0 errno code on error, 1 if ok.
 *
 * If it returns zero, something really bad happened, as it means the
 * works struct was already queued, but we have just allocated it, so
 * it should not happen.
 */
int i2400m_schedule_work(struct i2400m *i2400m,
			 void (*fn)(struct work_struct *), gfp_t gfp_flags)
{
	int result;
	struct i2400m_work *iw;

	BUG_ON(i2400m->work_queue == NULL);
	result = -ENOMEM;
	iw = kzalloc(sizeof(*iw), gfp_flags);
	if (iw == NULL)
		goto error_kzalloc;
	iw->i2400m = i2400m_get(i2400m);
	INIT_WORK(&iw->ws, fn);
	result = schedule_work(&iw->ws);
	if (result == 0)
		result = -ENXIO;
error_kzalloc:
	return result;
}


/*
 * WiMAX stack operation: relay a message from user space
 *
 * @wimax_dev: device descriptor
 * @pipe_name: named pipe the message is for
 * @msg_buf: pointer to the message bytes
 * @msg_len: length of the buffer
 * @genl_info: passed by the generic netlink layer
 *
 * The WiMAX stack will call this function when a message was received
 * from user space.
 *
 * For the i2400m, this is an L3L4 message, as specified in
 * include/linux/wimax/i2400m.h, and thus prefixed with a 'struct
 * i2400m_l3l4_hdr'. Driver (and device) expect the messages to be
 * coded in Little Endian.
 *
 * This function just verifies that the header declaration and the
 * payload are consistent and then deals with it, either forwarding it
 * to the device or procesing it locally.
 *
 * In the i2400m, messages are basically commands that will carry an
 * ack, so we use i2400m_msg_to_dev() and then deliver the ack back to
 * user space. The rx.c code might intercept the response and use it
 * to update the driver's state, but then it will pass it on so it can
 * be relayed back to user space.
 *
 * Note that asynchronous events from the device are processed and
 * sent to user space in rx.c.
 */
static
int i2400m_op_msg_from_user(struct wimax_dev *wimax_dev,
			    const char *pipe_name,
			    const void *msg_buf, size_t msg_len,
			    const struct genl_info *genl_info)
{
	int result;
	struct i2400m *i2400m = wimax_dev_to_i2400m(wimax_dev);
	struct device *dev = i2400m_dev(i2400m);
	struct sk_buff *ack_skb;

	d_fnstart(4, dev, "(wimax_dev %p [i2400m %p] msg_buf %p "
		  "msg_len %zu genl_info %p)\n", wimax_dev, i2400m,
		  msg_buf, msg_len, genl_info);
	ack_skb = i2400m_msg_to_dev(i2400m, msg_buf, msg_len);
	result = PTR_ERR(ack_skb);
	if (IS_ERR(ack_skb))
		goto error_msg_to_dev;
	if (unlikely(i2400m->trace_msg_from_user))
		wimax_msg(&i2400m->wimax_dev, "trace",
			  msg_buf, msg_len, GFP_KERNEL);
	result = wimax_msg_send(&i2400m->wimax_dev, ack_skb);
error_msg_to_dev:
	d_fnend(4, dev, "(wimax_dev %p [i2400m %p] msg_buf %p msg_len %zu "
		"genl_info %p) = %d\n", wimax_dev, i2400m, msg_buf, msg_len,
		genl_info, result);
	return result;
}


/*
 * Context to wait for a reset to finalize
 */
struct i2400m_reset_ctx {
	struct completion completion;
	int result;
};


/*
 * WiMAX stack operation: reset a device
 *
 * @wimax_dev: device descriptor
 *
 * See the documentation for wimax_reset() and wimax_dev->op_reset for
 * the requirements of this function. The WiMAX stack guarantees
 * serialization on calls to this function.
 *
 * Do a warm reset on the device; if it fails, resort to a cold reset
 * and return -ENODEV. On successful warm reset, we need to block
 * until it is complete.
 *
 * The bus-driver implementation of reset takes care of falling back
 * to cold reset if warm fails.
 */
static
int i2400m_op_reset(struct wimax_dev *wimax_dev)
{
	int result;
	struct i2400m *i2400m = wimax_dev_to_i2400m(wimax_dev);
	struct device *dev = i2400m_dev(i2400m);
	struct i2400m_reset_ctx ctx = {
		.completion = COMPLETION_INITIALIZER_ONSTACK(ctx.completion),
		.result = 0,
	};

	d_fnstart(4, dev, "(wimax_dev %p)\n", wimax_dev);
	mutex_lock(&i2400m->init_mutex);
	i2400m->reset_ctx = &ctx;
	mutex_unlock(&i2400m->init_mutex);
	result = i2400m->bus_reset(i2400m, I2400M_RT_WARM);
	if (result < 0)
		goto out;
	result = wait_for_completion_timeout(&ctx.completion, 4*HZ);
	if (result == 0)
		result = -ETIMEDOUT;
	else if (result > 0)
		result = ctx.result;
	/* if result < 0, pass it on */
	mutex_lock(&i2400m->init_mutex);
	i2400m->reset_ctx = NULL;
	mutex_unlock(&i2400m->init_mutex);
out:
	d_fnend(4, dev, "(wimax_dev %p) = %d\n", wimax_dev, result);
	return result;
}


/*
 * Check the MAC address we got from boot mode is ok
 *
 * @i2400m: device descriptor
 *
 * Returns: 0 if ok, < 0 errno code on error.
 */
static
int i2400m_check_mac_addr(struct i2400m *i2400m)
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	struct sk_buff *skb;
	const struct i2400m_tlv_detailed_device_info *ddi;
	struct net_device *net_dev = i2400m->wimax_dev.net_dev;
	const unsigned char zeromac[ETH_ALEN] = { 0 };

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
	skb = i2400m_get_device_info(i2400m);
	if (IS_ERR(skb)) {
		result = PTR_ERR(skb);
		dev_err(dev, "Cannot verify MAC address, error reading: %d\n",
			result);
		goto error;
	}
	/* Extract MAC addresss */
	ddi = (void *) skb->data;
	BUILD_BUG_ON(ETH_ALEN != sizeof(ddi->mac_address));
	d_printf(2, dev, "GET DEVICE INFO: mac addr "
		 "%02x:%02x:%02x:%02x:%02x:%02x\n",
		 ddi->mac_address[0], ddi->mac_address[1],
		 ddi->mac_address[2], ddi->mac_address[3],
		 ddi->mac_address[4], ddi->mac_address[5]);
	if (!memcmp(net_dev->perm_addr, ddi->mac_address,
		   sizeof(ddi->mac_address)))
		goto ok;
	dev_warn(dev, "warning: device reports a different MAC address "
		 "to that of boot mode's\n");
	dev_warn(dev, "device reports     %02x:%02x:%02x:%02x:%02x:%02x\n",
		 ddi->mac_address[0], ddi->mac_address[1],
		 ddi->mac_address[2], ddi->mac_address[3],
		 ddi->mac_address[4], ddi->mac_address[5]);
	dev_warn(dev, "boot mode reported %02x:%02x:%02x:%02x:%02x:%02x\n",
		 net_dev->perm_addr[0], net_dev->perm_addr[1],
		 net_dev->perm_addr[2], net_dev->perm_addr[3],
		 net_dev->perm_addr[4], net_dev->perm_addr[5]);
	if (!memcmp(zeromac, ddi->mac_address, sizeof(zeromac)))
		dev_err(dev, "device reports an invalid MAC address, "
			"not updating\n");
	else {
		dev_warn(dev, "updating MAC address\n");
		net_dev->addr_len = ETH_ALEN;
		memcpy(net_dev->perm_addr, ddi->mac_address, ETH_ALEN);
		memcpy(net_dev->dev_addr, ddi->mac_address, ETH_ALEN);
	}
ok:
	result = 0;
	kfree_skb(skb);
error:
	d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
	return result;
}


/**
 * __i2400m_dev_start - Bring up driver communication with the device
 *
 * @i2400m: device descriptor
 * @flags: boot mode flags
 *
 * Returns: 0 if ok, < 0 errno code on error.
 *
 * Uploads firmware and brings up all the resources needed to be able
 * to communicate with the device.
 *
 * TX needs to be setup before the bus-specific code (otherwise on
 * shutdown, the bus-tx code could try to access it).
 */
static
int __i2400m_dev_start(struct i2400m *i2400m, enum i2400m_bri flags)
{
	int result;
	struct wimax_dev *wimax_dev = &i2400m->wimax_dev;
	struct net_device *net_dev = wimax_dev->net_dev;
	struct device *dev = i2400m_dev(i2400m);
	int times = 3;

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
retry:
	result = i2400m_dev_bootstrap(i2400m, flags);
	if (result < 0) {
		dev_err(dev, "cannot bootstrap device: %d\n", result);
		goto error_bootstrap;
	}
	result = i2400m_tx_setup(i2400m);
	if (result < 0)
		goto error_tx_setup;
	result = i2400m->bus_dev_start(i2400m);
	if (result < 0)
		goto error_bus_dev_start;
	i2400m->work_queue = create_singlethread_workqueue(wimax_dev->name);
	if (i2400m->work_queue == NULL) {
		result = -ENOMEM;
		dev_err(dev, "cannot create workqueue\n");
		goto error_create_workqueue;
	}
	/* At this point is ok to send commands to the device */
	result = i2400m_check_mac_addr(i2400m);
	if (result < 0)
		goto error_check_mac_addr;
	i2400m->ready = 1;
	wimax_state_change(wimax_dev, WIMAX_ST_UNINITIALIZED);
	result = i2400m_dev_initialize(i2400m);
	if (result < 0)
		goto error_dev_initialize;
	/* At this point, reports will come for the device and set it
	 * to the right state if it is different than UNINITIALIZED */
	d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n",
		net_dev, i2400m, result);
	return result;

error_dev_initialize:
error_check_mac_addr:
	destroy_workqueue(i2400m->work_queue);
error_create_workqueue:
	i2400m->bus_dev_stop(i2400m);
error_bus_dev_start:
	i2400m_tx_release(i2400m);
error_tx_setup:
error_bootstrap:
	if (result == -ERESTARTSYS && times-- > 0) {
		flags = I2400M_BRI_SOFT;
		goto retry;
	}
	d_fnend(3, dev, "(net_dev %p [i2400m %p]) = %d\n",
		net_dev, i2400m, result);
	return result;
}


static
int i2400m_dev_start(struct i2400m *i2400m, enum i2400m_bri bm_flags)
{
	int result;
	mutex_lock(&i2400m->init_mutex);	/* Well, start the device */
	result = __i2400m_dev_start(i2400m, bm_flags);
	if (result >= 0)
		i2400m->updown = 1;
	mutex_unlock(&i2400m->init_mutex);
	return result;
}


/**
 * i2400m_dev_stop - Tear down driver communication with the device
 *
 * @i2400m: device descriptor
 *
 * Returns: 0 if ok, < 0 errno code on error.
 *
 * Releases all the resources allocated to communicate with the device.
 */
static
void __i2400m_dev_stop(struct i2400m *i2400m)
{
	struct wimax_dev *wimax_dev = &i2400m->wimax_dev;
	struct device *dev = i2400m_dev(i2400m);

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
	wimax_state_change(wimax_dev, __WIMAX_ST_QUIESCING);
	i2400m_dev_shutdown(i2400m);
	i2400m->ready = 0;
	destroy_workqueue(i2400m->work_queue);
	i2400m->bus_dev_stop(i2400m);
	i2400m_tx_release(i2400m);
	wimax_state_change(wimax_dev, WIMAX_ST_DOWN);
	d_fnend(3, dev, "(i2400m %p) = 0\n", i2400m);
}


/*
 * Watch out -- we only need to stop if there is a need for it. The
 * device could have reset itself and failed to come up again (see
 * _i2400m_dev_reset_handle()).
 */
static
void i2400m_dev_stop(struct i2400m *i2400m)
{
	mutex_lock(&i2400m->init_mutex);
	if (i2400m->updown) {
		__i2400m_dev_stop(i2400m);
		i2400m->updown = 0;
	}
	mutex_unlock(&i2400m->init_mutex);
}


/*
 * The device has rebooted; fix up the device and the driver
 *
 * Tear down the driver communication with the device, reload the
 * firmware and reinitialize the communication with the device.
 *
 * If someone calls a reset when the device's firmware is down, in
 * theory we won't see it because we are not listening. However, just
 * in case, leave the code to handle it.
 *
 * If there is a reset context, use it; this means someone is waiting
 * for us to tell him when the reset operation is complete and the
 * device is ready to rock again.
 *
 * NOTE: if we are in the process of bringing up or down the
 *       communication with the device [running i2400m_dev_start() or
 *       _stop()], don't do anything, let it fail and handle it.
 *
 * This function is ran always in a thread context
 */
static
void __i2400m_dev_reset_handle(struct work_struct *ws)
{
	int result;
	struct i2400m_work *iw = container_of(ws, struct i2400m_work, ws);
	struct i2400m *i2400m = iw->i2400m;
	struct device *dev = i2400m_dev(i2400m);
	enum wimax_st wimax_state;
	struct i2400m_reset_ctx *ctx = i2400m->reset_ctx;

	d_fnstart(3, dev, "(ws %p i2400m %p)\n", ws, i2400m);
	result = 0;
	if (mutex_trylock(&i2400m->init_mutex) == 0) {
		/* We are still in i2400m_dev_start() [let it fail] or
		 * i2400m_dev_stop() [we are shutting down anyway, so
		 * ignore it] or we are resetting somewhere else. */
		dev_err(dev, "device rebooted\n");
		i2400m_msg_to_dev_cancel_wait(i2400m, -ERESTARTSYS);
		complete(&i2400m->msg_completion);
		goto out;
	}
	wimax_state = wimax_state_get(&i2400m->wimax_dev);
	if (wimax_state < WIMAX_ST_UNINITIALIZED) {
		dev_info(dev, "device rebooted: it is down, ignoring\n");
		goto out_unlock;	/* ifconfig up/down wasn't called */
	}
	dev_err(dev, "device rebooted: reinitializing driver\n");
	__i2400m_dev_stop(i2400m);
	i2400m->updown = 0;
	result = __i2400m_dev_start(i2400m,
				    I2400M_BRI_SOFT | I2400M_BRI_MAC_REINIT);
	if (result < 0) {
		dev_err(dev, "device reboot: cannot start the device: %d\n",
			result);
		result = i2400m->bus_reset(i2400m, I2400M_RT_BUS);
		if (result >= 0)
			result = -ENODEV;
	} else
		i2400m->updown = 1;
out_unlock:
	if (i2400m->reset_ctx) {
		ctx->result = result;
		complete(&ctx->completion);
	}
	mutex_unlock(&i2400m->init_mutex);
out:
	i2400m_put(i2400m);
	kfree(iw);
	d_fnend(3, dev, "(ws %p i2400m %p) = void\n", ws, i2400m);
	return;
}


/**
 * i2400m_dev_reset_handle - Handle a device's reset in a thread context
 *
 * Schedule a device reset handling out on a thread context, so it
 * is safe to call from atomic context. We can't use the i2400m's
 * queue as we are going to destroy it and reinitialize it as part of
 * the driver bringup/bringup process.
 *
 * See __i2400m_dev_reset_handle() for details; that takes care of
 * reinitializing the driver to handle the reset, calling into the
 * bus-specific functions ops as needed.
 */
int i2400m_dev_reset_handle(struct i2400m *i2400m)
{
	return i2400m_schedule_work(i2400m, __i2400m_dev_reset_handle,
				    GFP_ATOMIC);
}
EXPORT_SYMBOL_GPL(i2400m_dev_reset_handle);


/**
 * i2400m_setup - bus-generic setup function for the i2400m device
 *
 * @i2400m: device descriptor (bus-specific parts have been initialized)
 *
 * Returns: 0 if ok, < 0 errno code on error.
 *
 * Initializes the bus-generic parts of the i2400m driver; the
 * bus-specific parts have been initialized, function pointers filled
 * out by the bus-specific probe function.
 *
 * As well, this registers the WiMAX and net device nodes. Once this
 * function returns, the device is operative and has to be ready to
 * receive and send network traffic and WiMAX control operations.
 */
int i2400m_setup(struct i2400m *i2400m, enum i2400m_bri bm_flags)
{
	int result = -ENODEV;
	struct device *dev = i2400m_dev(i2400m);
	struct wimax_dev *wimax_dev = &i2400m->wimax_dev;
	struct net_device *net_dev = i2400m->wimax_dev.net_dev;

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);

	snprintf(wimax_dev->name, sizeof(wimax_dev->name),
		 "i2400m-%s:%s", dev->bus->name, dev->bus_id);

	i2400m->bm_cmd_buf = kzalloc(I2400M_BM_CMD_BUF_SIZE, GFP_KERNEL);
	if (i2400m->bm_cmd_buf == NULL) {
		dev_err(dev, "cannot allocate USB command buffer\n");
		goto error_bm_cmd_kzalloc;
	}
	i2400m->bm_ack_buf = kzalloc(I2400M_BM_ACK_BUF_SIZE, GFP_KERNEL);
	if (i2400m->bm_ack_buf == NULL) {
		dev_err(dev, "cannot allocate USB ack buffer\n");
		goto error_bm_ack_buf_kzalloc;
	}
	result = i2400m_bootrom_init(i2400m, bm_flags);
	if (result < 0) {
		dev_err(dev, "read mac addr: bootrom init "
			"failed: %d\n", result);
		goto error_bootrom_init;
	}
	result = i2400m_read_mac_addr(i2400m);
	if (result < 0)
		goto error_read_mac_addr;

	result = register_netdev(net_dev);	/* Okey dokey, bring it up */
	if (result < 0) {
		dev_err(dev, "cannot register i2400m network device: %d\n",
			result);
		goto error_register_netdev;
	}
	netif_carrier_off(net_dev);

	result = i2400m_dev_start(i2400m, bm_flags);
	if (result < 0)
		goto error_dev_start;

	i2400m->wimax_dev.op_msg_from_user = i2400m_op_msg_from_user;
	i2400m->wimax_dev.op_rfkill_sw_toggle = i2400m_op_rfkill_sw_toggle;
	i2400m->wimax_dev.op_reset = i2400m_op_reset;
	result = wimax_dev_add(&i2400m->wimax_dev, net_dev);
	if (result < 0)
		goto error_wimax_dev_add;
	/* User space needs to do some init stuff */
	wimax_state_change(wimax_dev, WIMAX_ST_UNINITIALIZED);

	/* Now setup all that requires a registered net and wimax device. */
	result = i2400m_debugfs_add(i2400m);
	if (result < 0) {
		dev_err(dev, "cannot setup i2400m's debugfs: %d\n", result);
		goto error_debugfs_setup;
	}
	d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
	return result;

error_debugfs_setup:
	wimax_dev_rm(&i2400m->wimax_dev);
error_wimax_dev_add:
	i2400m_dev_stop(i2400m);
error_dev_start:
	unregister_netdev(net_dev);
error_register_netdev:
error_read_mac_addr:
error_bootrom_init:
	kfree(i2400m->bm_ack_buf);
error_bm_ack_buf_kzalloc:
	kfree(i2400m->bm_cmd_buf);
error_bm_cmd_kzalloc:
	d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
	return result;
}
EXPORT_SYMBOL_GPL(i2400m_setup);


/**
 * i2400m_release - release the bus-generic driver resources
 *
 * Sends a disconnect message and undoes any setup done by i2400m_setup()
 */
void i2400m_release(struct i2400m *i2400m)
{
	struct device *dev = i2400m_dev(i2400m);

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
	netif_stop_queue(i2400m->wimax_dev.net_dev);

	i2400m_debugfs_rm(i2400m);
	wimax_dev_rm(&i2400m->wimax_dev);
	i2400m_dev_stop(i2400m);
	unregister_netdev(i2400m->wimax_dev.net_dev);
	kfree(i2400m->bm_ack_buf);
	kfree(i2400m->bm_cmd_buf);
	d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
}
EXPORT_SYMBOL_GPL(i2400m_release);


/*
 * Debug levels control; see debug.h
 */
struct d_level D_LEVEL[] = {
	D_SUBMODULE_DEFINE(control),
	D_SUBMODULE_DEFINE(driver),
	D_SUBMODULE_DEFINE(debugfs),
	D_SUBMODULE_DEFINE(fw),
	D_SUBMODULE_DEFINE(netdev),
	D_SUBMODULE_DEFINE(rfkill),
	D_SUBMODULE_DEFINE(rx),
	D_SUBMODULE_DEFINE(tx),
};
size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);


static
int __init i2400m_driver_init(void)
{
	return 0;
}
module_init(i2400m_driver_init);

static
void __exit i2400m_driver_exit(void)
{
	/* for scheds i2400m_dev_reset_handle() */
	flush_scheduled_work();
	return;
}
module_exit(i2400m_driver_exit);

MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
MODULE_DESCRIPTION("Intel 2400M WiMAX networking bus-generic driver");
MODULE_LICENSE("GPL");
反馈
建议
客服 返回
顶部