control.c 42.8 KB
Newer Older
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
/*
 * Intel Wireless WiMAX Connection 2400m
 * Miscellaneous control functions for managing the device
 *
 *
 * Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * Intel Corporation <linux-wimax@intel.com>
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *  - Initial implementation
 *
 * This is a collection of functions used to control the device (plus
 * a few helpers).
 *
 * There are utilities for handling TLV buffers, hooks on the device's
 * reports to act on device changes of state [i2400m_report_hook()],
 * on acks to commands [i2400m_msg_ack_hook()], a helper for sending
 * commands to the device and blocking until a reply arrives
 * [i2400m_msg_to_dev()], a few high level commands for manipulating
 * the device state, powersving mode and configuration plus the
 * routines to setup the device once communication is stablished with
 * it [i2400m_dev_initialize()].
 *
 * ROADMAP
 *
53
 * i2400m_dev_initialize()       Called by i2400m_dev_start()
54 55 56
 *   i2400m_set_init_config()
 *   i2400m_cmd_get_state()
 * i2400m_dev_shutdown()        Called by i2400m_dev_stop()
57
 *   i2400m_reset()
58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
 *
 * i2400m_{cmd,get,set}_*()
 *   i2400m_msg_to_dev()
 *   i2400m_msg_check_status()
 *
 * i2400m_report_hook()         Called on reception of an event
 *   i2400m_report_state_hook()
 *     i2400m_tlv_buffer_walk()
 *     i2400m_tlv_match()
 *     i2400m_report_tlv_system_state()
 *     i2400m_report_tlv_rf_switches_status()
 *     i2400m_report_tlv_media_status()
 *   i2400m_cmd_enter_powersave()
 *
 * i2400m_msg_ack_hook()        Called on reception of a reply to a
 *                              command, get or set
 */

#include <stdarg.h>
#include "i2400m.h"
#include <linux/kernel.h>
79
#include <linux/slab.h>
80 81 82 83 84 85
#include <linux/wimax/i2400m.h>


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

86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
static 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.");

/* 0 (power saving enabled) by default */
static int i2400m_power_save_disabled;
module_param_named(power_save_disabled, i2400m_power_save_disabled, int, 0644);
MODULE_PARM_DESC(power_save_disabled,
		 "If true, the driver will not tell the device to enter "
		 "power saving mode when it reports it is ready for it. "
		 "False by default (so the device is told to do power "
		 "saving).");

101
static int i2400m_passive_mode;	/* 0 (passive mode disabled) by default */
102 103 104 105 106 107
module_param_named(passive_mode, i2400m_passive_mode, int, 0644);
MODULE_PARM_DESC(passive_mode,
		 "If true, the driver will not do any device setup "
		 "and leave it up to user space, who must be properly "
		 "setup.");

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

/*
 * Return if a TLV is of a give type and size
 *
 * @tlv_hdr: pointer to the TLV
 * @tlv_type: type of the TLV we are looking for
 * @tlv_size: expected size of the TLV we are looking for (if -1,
 *            don't check the size). This includes the header
 * Returns: 0 if the TLV matches
 *          < 0 if it doesn't match at all
 *          > 0 total TLV + payload size, if the type matches, but not
 *              the size
 */
static
ssize_t i2400m_tlv_match(const struct i2400m_tlv_hdr *tlv,
		     enum i2400m_tlv tlv_type, ssize_t tlv_size)
{
	if (le16_to_cpu(tlv->type) != tlv_type)	/* Not our type? skip */
		return -1;
	if (tlv_size != -1
	    && le16_to_cpu(tlv->length) + sizeof(*tlv) != tlv_size) {
		size_t size = le16_to_cpu(tlv->length) + sizeof(*tlv);
		printk(KERN_WARNING "W: tlv type 0x%x mismatched because of "
		       "size (got %zu vs %zu expected)\n",
		       tlv_type, size, tlv_size);
		return size;
	}
	return 0;
}


/*
 * Given a buffer of TLVs, iterate over them
 *
 * @i2400m: device instance
 * @tlv_buf: pointer to the beginning of the TLV buffer
 * @buf_size: buffer size in bytes
 * @tlv_pos: seek position; this is assumed to be a pointer returned
 *           by i2400m_tlv_buffer_walk() [and thus, validated]. The
 *           TLV returned will be the one following this one.
 *
 * Usage:
 *
 * tlv_itr = NULL;
 * while (tlv_itr = i2400m_tlv_buffer_walk(i2400m, buf, size, tlv_itr))  {
 *         ...
 *         // Do stuff with tlv_itr, DON'T MODIFY IT
 *         ...
 * }
 */
static
const struct i2400m_tlv_hdr *i2400m_tlv_buffer_walk(
	struct i2400m *i2400m,
	const void *tlv_buf, size_t buf_size,
	const struct i2400m_tlv_hdr *tlv_pos)
{
	struct device *dev = i2400m_dev(i2400m);
	const struct i2400m_tlv_hdr *tlv_top = tlv_buf + buf_size;
	size_t offset, length, avail_size;
	unsigned type;

	if (tlv_pos == NULL)	/* Take the first one? */
		tlv_pos = tlv_buf;
	else			/* Nope, the next one */
		tlv_pos = (void *) tlv_pos
			+ le16_to_cpu(tlv_pos->length) + sizeof(*tlv_pos);
	if (tlv_pos == tlv_top) {	/* buffer done */
		tlv_pos = NULL;
		goto error_beyond_end;
	}
	if (tlv_pos > tlv_top) {
		tlv_pos = NULL;
		WARN_ON(1);
		goto error_beyond_end;
	}
	offset = (void *) tlv_pos - (void *) tlv_buf;
	avail_size = buf_size - offset;
	if (avail_size < sizeof(*tlv_pos)) {
		dev_err(dev, "HW BUG? tlv_buf %p [%zu bytes], tlv @%zu: "
			"short header\n", tlv_buf, buf_size, offset);
		goto error_short_header;
	}
	type = le16_to_cpu(tlv_pos->type);
	length = le16_to_cpu(tlv_pos->length);
	if (avail_size < sizeof(*tlv_pos) + length) {
		dev_err(dev, "HW BUG? tlv_buf %p [%zu bytes], "
			"tlv type 0x%04x @%zu: "
			"short data (%zu bytes vs %zu needed)\n",
			tlv_buf, buf_size, type, offset, avail_size,
			sizeof(*tlv_pos) + length);
		goto error_short_header;
	}
error_short_header:
error_beyond_end:
	return tlv_pos;
}


/*
 * Find a TLV in a buffer of sequential TLVs
 *
 * @i2400m: device descriptor
 * @tlv_hdr: pointer to the first TLV in the sequence
 * @size: size of the buffer in bytes; all TLVs are assumed to fit
 *        fully in the buffer (otherwise we'll complain).
 * @tlv_type: type of the TLV we are looking for
 * @tlv_size: expected size of the TLV we are looking for (if -1,
 *            don't check the size). This includes the header
 *
 * Returns: NULL if the TLV is not found, otherwise a pointer to
 *          it. If the sizes don't match, an error is printed and NULL
 *          returned.
 */
static
const struct i2400m_tlv_hdr *i2400m_tlv_find(
	struct i2400m *i2400m,
	const struct i2400m_tlv_hdr *tlv_hdr, size_t size,
	enum i2400m_tlv tlv_type, ssize_t tlv_size)
{
	ssize_t match;
	struct device *dev = i2400m_dev(i2400m);
	const struct i2400m_tlv_hdr *tlv = NULL;
	while ((tlv = i2400m_tlv_buffer_walk(i2400m, tlv_hdr, size, tlv))) {
		match = i2400m_tlv_match(tlv, tlv_type, tlv_size);
		if (match == 0)		/* found it :) */
			break;
		if (match > 0)
			dev_warn(dev, "TLV type 0x%04x found with size "
				 "mismatch (%zu vs %zu needed)\n",
				 tlv_type, match, tlv_size);
	}
	return tlv;
}


static const struct
{
	char *msg;
	int errno;
} ms_to_errno[I2400M_MS_MAX] = {
	[I2400M_MS_DONE_OK] = { "", 0 },
	[I2400M_MS_DONE_IN_PROGRESS] = { "", 0 },
	[I2400M_MS_INVALID_OP] = { "invalid opcode", -ENOSYS },
	[I2400M_MS_BAD_STATE] = { "invalid state", -EILSEQ },
	[I2400M_MS_ILLEGAL_VALUE] = { "illegal value", -EINVAL },
	[I2400M_MS_MISSING_PARAMS] = { "missing parameters", -ENOMSG },
	[I2400M_MS_VERSION_ERROR] = { "bad version", -EIO },
	[I2400M_MS_ACCESSIBILITY_ERROR] = { "accesibility error", -EIO },
	[I2400M_MS_BUSY] = { "busy", -EBUSY },
	[I2400M_MS_CORRUPTED_TLV] = { "corrupted TLV", -EILSEQ },
	[I2400M_MS_UNINITIALIZED] = { "not unitialized", -EILSEQ },
	[I2400M_MS_UNKNOWN_ERROR] = { "unknown error", -EIO },
	[I2400M_MS_PRODUCTION_ERROR] = { "production error", -EIO },
	[I2400M_MS_NO_RF] = { "no RF", -EIO },
	[I2400M_MS_NOT_READY_FOR_POWERSAVE] =
		{ "not ready for powersave", -EACCES },
	[I2400M_MS_THERMAL_CRITICAL] = { "thermal critical", -EL3HLT },
};


/*
 * i2400m_msg_check_status - translate a message's status code
 *
 * @i2400m: device descriptor
 * @l3l4_hdr: message header
 * @strbuf: buffer to place a formatted error message (unless NULL).
 * @strbuf_size: max amount of available space; larger messages will
 * be truncated.
 *
 * Returns: errno code corresponding to the status code in @l3l4_hdr
 *          and a message in @strbuf describing the error.
 */
int i2400m_msg_check_status(const struct i2400m_l3l4_hdr *l3l4_hdr,
			    char *strbuf, size_t strbuf_size)
{
	int result;
	enum i2400m_ms status = le16_to_cpu(l3l4_hdr->status);
	const char *str;

	if (status == 0)
		return 0;
289
	if (status >= ARRAY_SIZE(ms_to_errno)) {
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
		str = "unknown status code";
		result = -EBADR;
	} else {
		str = ms_to_errno[status].msg;
		result = ms_to_errno[status].errno;
	}
	if (strbuf)
		snprintf(strbuf, strbuf_size, "%s (%d)", str, status);
	return result;
}


/*
 * Act on a TLV System State reported by the device
 *
 * @i2400m: device descriptor
 * @ss: validated System State TLV
 */
static
void i2400m_report_tlv_system_state(struct i2400m *i2400m,
				    const struct i2400m_tlv_system_state *ss)
{
	struct device *dev = i2400m_dev(i2400m);
	struct wimax_dev *wimax_dev = &i2400m->wimax_dev;
	enum i2400m_system_state i2400m_state = le32_to_cpu(ss->state);

	d_fnstart(3, dev, "(i2400m %p ss %p [%u])\n", i2400m, ss, i2400m_state);

	if (i2400m->state != i2400m_state) {
		i2400m->state = i2400m_state;
		wake_up_all(&i2400m->state_wq);
	}
	switch (i2400m_state) {
	case I2400M_SS_UNINITIALIZED:
	case I2400M_SS_INIT:
	case I2400M_SS_CONFIG:
	case I2400M_SS_PRODUCTION:
		wimax_state_change(wimax_dev, WIMAX_ST_UNINITIALIZED);
		break;

	case I2400M_SS_RF_OFF:
	case I2400M_SS_RF_SHUTDOWN:
		wimax_state_change(wimax_dev, WIMAX_ST_RADIO_OFF);
		break;

	case I2400M_SS_READY:
	case I2400M_SS_STANDBY:
	case I2400M_SS_SLEEPACTIVE:
		wimax_state_change(wimax_dev, WIMAX_ST_READY);
		break;

	case I2400M_SS_CONNECTING:
	case I2400M_SS_WIMAX_CONNECTED:
		wimax_state_change(wimax_dev, WIMAX_ST_READY);
		break;

	case I2400M_SS_SCAN:
	case I2400M_SS_OUT_OF_ZONE:
		wimax_state_change(wimax_dev, WIMAX_ST_SCANNING);
		break;

	case I2400M_SS_IDLE:
		d_printf(1, dev, "entering BS-negotiated idle mode\n");
	case I2400M_SS_DISCONNECTING:
	case I2400M_SS_DATA_PATH_CONNECTED:
		wimax_state_change(wimax_dev, WIMAX_ST_CONNECTED);
		break;

	default:
		/* Huh? just in case, shut it down */
		dev_err(dev, "HW BUG? unknown state %u: shutting down\n",
			i2400m_state);
362
		i2400m_reset(i2400m, I2400M_RT_WARM);
363
		break;
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
	d_fnend(3, dev, "(i2400m %p ss %p [%u]) = void\n",
		i2400m, ss, i2400m_state);
}


/*
 * Parse and act on a TLV Media Status sent by the device
 *
 * @i2400m: device descriptor
 * @ms: validated Media Status TLV
 *
 * This will set the carrier up on down based on the device's link
 * report. This is done asides of what the WiMAX stack does based on
 * the device's state as sometimes we need to do a link-renew (the BS
 * wants us to renew a DHCP lease, for example).
 *
 * In fact, doc says that everytime we get a link-up, we should do a
 * DHCP negotiation...
 */
static
void i2400m_report_tlv_media_status(struct i2400m *i2400m,
				    const struct i2400m_tlv_media_status *ms)
{
	struct device *dev = i2400m_dev(i2400m);
	struct wimax_dev *wimax_dev = &i2400m->wimax_dev;
	struct net_device *net_dev = wimax_dev->net_dev;
	enum i2400m_media_status status = le32_to_cpu(ms->media_status);

	d_fnstart(3, dev, "(i2400m %p ms %p [%u])\n", i2400m, ms, status);

	switch (status) {
	case I2400M_MEDIA_STATUS_LINK_UP:
		netif_carrier_on(net_dev);
		break;
	case I2400M_MEDIA_STATUS_LINK_DOWN:
		netif_carrier_off(net_dev);
		break;
	/*
	 * This is the network telling us we need to retrain the DHCP
	 * lease -- so far, we are trusting the WiMAX Network Service
	 * in user space to pick this up and poke the DHCP client.
	 */
	case I2400M_MEDIA_STATUS_LINK_RENEW:
		netif_carrier_on(net_dev);
		break;
	default:
		dev_err(dev, "HW BUG? unknown media status %u\n",
			status);
413
	}
414 415 416 417 418 419
	d_fnend(3, dev, "(i2400m %p ms %p [%u]) = void\n",
		i2400m, ms, status);
}


/*
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
 * Process a TLV from a 'state report'
 *
 * @i2400m: device descriptor
 * @tlv: pointer to the TLV header; it has been already validated for
 *     consistent size.
 * @tag: for error messages
 *
 * Act on the TLVs from a 'state report'.
 */
static
void i2400m_report_state_parse_tlv(struct i2400m *i2400m,
				   const struct i2400m_tlv_hdr *tlv,
				   const char *tag)
{
	struct device *dev = i2400m_dev(i2400m);
	const struct i2400m_tlv_media_status *ms;
	const struct i2400m_tlv_system_state *ss;
	const struct i2400m_tlv_rf_switches_status *rfss;

	if (0 == i2400m_tlv_match(tlv, I2400M_TLV_SYSTEM_STATE, sizeof(*ss))) {
		ss = container_of(tlv, typeof(*ss), hdr);
		d_printf(2, dev, "%s: system state TLV "
			 "found (0x%04x), state 0x%08x\n",
			 tag, I2400M_TLV_SYSTEM_STATE,
			 le32_to_cpu(ss->state));
		i2400m_report_tlv_system_state(i2400m, ss);
	}
	if (0 == i2400m_tlv_match(tlv, I2400M_TLV_RF_STATUS, sizeof(*rfss))) {
		rfss = container_of(tlv, typeof(*rfss), hdr);
		d_printf(2, dev, "%s: RF status TLV "
			 "found (0x%04x), sw 0x%02x hw 0x%02x\n",
			 tag, I2400M_TLV_RF_STATUS,
			 le32_to_cpu(rfss->sw_rf_switch),
			 le32_to_cpu(rfss->hw_rf_switch));
		i2400m_report_tlv_rf_switches_status(i2400m, rfss);
	}
	if (0 == i2400m_tlv_match(tlv, I2400M_TLV_MEDIA_STATUS, sizeof(*ms))) {
		ms = container_of(tlv, typeof(*ms), hdr);
		d_printf(2, dev, "%s: Media Status TLV: %u\n",
			 tag, le32_to_cpu(ms->media_status));
		i2400m_report_tlv_media_status(i2400m, ms);
	}
}


/*
 * Parse a 'state report' and extract information
467 468 469 470 471 472 473 474
 *
 * @i2400m: device descriptor
 * @l3l4_hdr: pointer to message; it has been already validated for
 *            consistent size.
 * @size: size of the message (header + payload). The header length
 *        declaration is assumed to be congruent with @size (as in
 *        sizeof(*l3l4_hdr) + l3l4_hdr->length == size)
 *
475
 * Walk over the TLVs in a report state and act on them.
476 477 478 479 480 481 482 483 484 485 486 487 488 489 490
 */
static
void i2400m_report_state_hook(struct i2400m *i2400m,
			      const struct i2400m_l3l4_hdr *l3l4_hdr,
			      size_t size, const char *tag)
{
	struct device *dev = i2400m_dev(i2400m);
	const struct i2400m_tlv_hdr *tlv;
	size_t tlv_size = le16_to_cpu(l3l4_hdr->length);

	d_fnstart(4, dev, "(i2400m %p, l3l4_hdr %p, size %zu, %s)\n",
		  i2400m, l3l4_hdr, size, tag);
	tlv = NULL;

	while ((tlv = i2400m_tlv_buffer_walk(i2400m, &l3l4_hdr->pl,
491 492
					     tlv_size, tlv)))
		i2400m_report_state_parse_tlv(i2400m, tlv, tag);
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
	d_fnend(4, dev, "(i2400m %p, l3l4_hdr %p, size %zu, %s) = void\n",
		i2400m, l3l4_hdr, size, tag);
}


/*
 * i2400m_report_hook - (maybe) act on a report
 *
 * @i2400m: device descriptor
 * @l3l4_hdr: pointer to message; it has been already validated for
 *            consistent size.
 * @size: size of the message (header + payload). The header length
 *        declaration is assumed to be congruent with @size (as in
 *        sizeof(*l3l4_hdr) + l3l4_hdr->length == size)
 *
 * Extract information we might need (like carrien on/off) from a
 * device report.
 */
void i2400m_report_hook(struct i2400m *i2400m,
			const struct i2400m_l3l4_hdr *l3l4_hdr, size_t size)
{
	struct device *dev = i2400m_dev(i2400m);
	unsigned msg_type;

	d_fnstart(3, dev, "(i2400m %p l3l4_hdr %p size %zu)\n",
		  i2400m, l3l4_hdr, size);
	/* Chew on the message, we might need some information from
	 * here */
	msg_type = le16_to_cpu(l3l4_hdr->type);
	switch (msg_type) {
	case I2400M_MT_REPORT_STATE:	/* carrier detection... */
		i2400m_report_state_hook(i2400m,
					 l3l4_hdr, size, "REPORT STATE");
		break;
	/* If the device is ready for power save, then ask it to do
	 * it. */
	case I2400M_MT_REPORT_POWERSAVE_READY:	/* zzzzz */
		if (l3l4_hdr->status == cpu_to_le16(I2400M_MS_DONE_OK)) {
531 532 533 534 535 536 537 538 539
			if (i2400m_power_save_disabled)
				d_printf(1, dev, "ready for powersave, "
					 "not requesting (disabled by module "
					 "parameter)\n");
			else {
				d_printf(1, dev, "ready for powersave, "
					 "requesting\n");
				i2400m_cmd_enter_powersave(i2400m);
			}
540 541
		}
		break;
542
	}
543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560
	d_fnend(3, dev, "(i2400m %p l3l4_hdr %p size %zu) = void\n",
		i2400m, l3l4_hdr, size);
}


/*
 * i2400m_msg_ack_hook - process cmd/set/get ack for internal status
 *
 * @i2400m: device descriptor
 * @l3l4_hdr: pointer to message; it has been already validated for
 *            consistent size.
 * @size: size of the message
 *
 * Extract information we might need from acks to commands and act on
 * it. This is akin to i2400m_report_hook(). Note most of this
 * processing should be done in the function that calls the
 * command. This is here for some cases where it can't happen...
 */
561 562 563
static void i2400m_msg_ack_hook(struct i2400m *i2400m,
				 const struct i2400m_l3l4_hdr *l3l4_hdr,
				 size_t size)
564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	unsigned ack_type, ack_status;
	char strerr[32];

	/* Chew on the message, we might need some information from
	 * here */
	ack_type = le16_to_cpu(l3l4_hdr->type);
	ack_status = le16_to_cpu(l3l4_hdr->status);
	switch (ack_type) {
	case I2400M_MT_CMD_ENTER_POWERSAVE:
		/* This is just left here for the sake of example, as
		 * the processing is done somewhere else. */
		if (0) {
			result = i2400m_msg_check_status(
				l3l4_hdr, strerr, sizeof(strerr));
			if (result >= 0)
				d_printf(1, dev, "ready for power save: %zd\n",
					 size);
		}
		break;
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
}


/*
 * i2400m_msg_size_check() - verify message size and header are congruent
 *
 * It is ok if the total message size is larger than the expected
 * size, as there can be padding.
 */
int i2400m_msg_size_check(struct i2400m *i2400m,
			  const struct i2400m_l3l4_hdr *l3l4_hdr,
			  size_t msg_size)
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	size_t expected_size;
	d_fnstart(4, dev, "(i2400m %p l3l4_hdr %p msg_size %zu)\n",
		  i2400m, l3l4_hdr, msg_size);
	if (msg_size < sizeof(*l3l4_hdr)) {
		dev_err(dev, "bad size for message header "
			"(expected at least %zu, got %zu)\n",
			(size_t) sizeof(*l3l4_hdr), msg_size);
		result = -EIO;
		goto error_hdr_size;
	}
	expected_size = le16_to_cpu(l3l4_hdr->length) + sizeof(*l3l4_hdr);
	if (msg_size < expected_size) {
		dev_err(dev, "bad size for message code 0x%04x (expected %zu, "
			"got %zu)\n", le16_to_cpu(l3l4_hdr->type),
			expected_size, msg_size);
		result = -EIO;
	} else
		result = 0;
error_hdr_size:
	d_fnend(4, dev,
		"(i2400m %p l3l4_hdr %p msg_size %zu) = %d\n",
		i2400m, l3l4_hdr, msg_size, result);
	return result;
}



/*
 * Cancel a wait for a command ACK
 *
 * @i2400m: device descriptor
 * @code: [negative] errno code to cancel with (don't use
 *     -EINPROGRESS)
 *
 * If there is an ack already filled out, free it.
 */
void i2400m_msg_to_dev_cancel_wait(struct i2400m *i2400m, int code)
{
	struct sk_buff *ack_skb;
	unsigned long flags;

	spin_lock_irqsave(&i2400m->rx_lock, flags);
	ack_skb = i2400m->ack_skb;
	if (ack_skb && !IS_ERR(ack_skb))
646
		kfree_skb(ack_skb);
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
	i2400m->ack_skb = ERR_PTR(code);
	spin_unlock_irqrestore(&i2400m->rx_lock, flags);
}


/**
 * i2400m_msg_to_dev - Send a control message to the device and get a response
 *
 * @i2400m: device descriptor
 *
 * @msg_skb: an skb  *
 *
 * @buf: pointer to the buffer containing the message to be sent; it
 *           has to start with a &struct i2400M_l3l4_hdr and then
 *           followed by the payload. Once this function returns, the
 *           buffer can be reused.
 *
 * @buf_len: buffer size
 *
 * Returns:
 *
 * Pointer to skb containing the ack message. You need to check the
 * pointer with IS_ERR(), as it might be an error code. Error codes
 * could happen because:
 *
 *  - the message wasn't formatted correctly
 *  - couldn't send the message
 *  - failed waiting for a response
 *  - the ack message wasn't formatted correctly
 *
 * The returned skb has been allocated with wimax_msg_to_user_alloc(),
 * it contains the reponse in a netlink attribute and is ready to be
 * passed up to user space with wimax_msg_to_user_send(). To access
 * the payload and its length, use wimax_msg_{data,len}() on the skb.
 *
 * The skb has to be freed with kfree_skb() once done.
 *
 * Description:
 *
 * This function delivers a message/command to the device and waits
 * for an ack to be received. The format is described in
 * linux/wimax/i2400m.h. In summary, a command/get/set is followed by an
 * ack.
 *
 * This function will not check the ack status, that's left up to the
 * caller.  Once done with the ack skb, it has to be kfree_skb()ed.
 *
 * The i2400m handles only one message at the same time, thus we need
 * the mutex to exclude other players.
 *
 * We write the message and then wait for an answer to come back. The
 * RX path intercepts control messages and handles them in
 * i2400m_rx_ctl(). Reports (notifications) are (maybe) processed
 * locally and then forwarded (as needed) to user space on the WiMAX
 * stack message pipe. Acks are saved and passed back to us through an
 * skb in i2400m->ack_skb which is ready to be given to generic
 * netlink if need be.
 */
struct sk_buff *i2400m_msg_to_dev(struct i2400m *i2400m,
				  const void *buf, size_t buf_len)
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	const struct i2400m_l3l4_hdr *msg_l3l4_hdr;
	struct sk_buff *ack_skb;
	const struct i2400m_l3l4_hdr *ack_l3l4_hdr;
	size_t ack_len;
	int ack_timeout;
	unsigned msg_type;
	unsigned long flags;

	d_fnstart(3, dev, "(i2400m %p buf %p len %zu)\n",
		  i2400m, buf, buf_len);

721
	rmb();		/* Make sure we see what i2400m_dev_reset_handle() */
722
	if (i2400m->boot_mode)
723
		return ERR_PTR(-EL3RST);
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757

	msg_l3l4_hdr = buf;
	/* Check msg & payload consistency */
	result = i2400m_msg_size_check(i2400m, msg_l3l4_hdr, buf_len);
	if (result < 0)
		goto error_bad_msg;
	msg_type = le16_to_cpu(msg_l3l4_hdr->type);
	d_printf(1, dev, "CMD/GET/SET 0x%04x %zu bytes\n",
		 msg_type, buf_len);
	d_dump(2, dev, buf, buf_len);

	/* Setup the completion, ack_skb ("we are waiting") and send
	 * the message to the device */
	mutex_lock(&i2400m->msg_mutex);
	spin_lock_irqsave(&i2400m->rx_lock, flags);
	i2400m->ack_skb = ERR_PTR(-EINPROGRESS);
	spin_unlock_irqrestore(&i2400m->rx_lock, flags);
	init_completion(&i2400m->msg_completion);
	result = i2400m_tx(i2400m, buf, buf_len, I2400M_PT_CTRL);
	if (result < 0) {
		dev_err(dev, "can't send message 0x%04x: %d\n",
			le16_to_cpu(msg_l3l4_hdr->type), result);
		goto error_tx;
	}

	/* Some commands take longer to execute because of crypto ops,
	 * so we give them some more leeway on timeout */
	switch (msg_type) {
	case I2400M_MT_GET_TLS_OPERATION_RESULT:
	case I2400M_MT_CMD_SEND_EAP_RESPONSE:
		ack_timeout = 5 * HZ;
		break;
	default:
		ack_timeout = HZ;
758
	}
759

760 761
	if (unlikely(i2400m->trace_msg_from_user))
		wimax_msg(&i2400m->wimax_dev, "echo", buf, buf_len, GFP_KERNEL);
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795
	/* The RX path in rx.c will put any response for this message
	 * in i2400m->ack_skb and wake us up. If we cancel the wait,
	 * we need to change the value of i2400m->ack_skb to something
	 * not -EINPROGRESS so RX knows there is no one waiting. */
	result = wait_for_completion_interruptible_timeout(
		&i2400m->msg_completion, ack_timeout);
	if (result == 0) {
		dev_err(dev, "timeout waiting for reply to message 0x%04x\n",
			msg_type);
		result = -ETIMEDOUT;
		i2400m_msg_to_dev_cancel_wait(i2400m, result);
		goto error_wait_for_completion;
	} else if (result < 0) {
		dev_err(dev, "error waiting for reply to message 0x%04x: %d\n",
			msg_type, result);
		i2400m_msg_to_dev_cancel_wait(i2400m, result);
		goto error_wait_for_completion;
	}

	/* Pull out the ack data from i2400m->ack_skb -- see if it is
	 * an error and act accordingly */
	spin_lock_irqsave(&i2400m->rx_lock, flags);
	ack_skb = i2400m->ack_skb;
	if (IS_ERR(ack_skb))
		result = PTR_ERR(ack_skb);
	else
		result = 0;
	i2400m->ack_skb = NULL;
	spin_unlock_irqrestore(&i2400m->rx_lock, flags);
	if (result < 0)
		goto error_ack_status;
	ack_l3l4_hdr = wimax_msg_data_len(ack_skb, &ack_len);

	/* Check the ack and deliver it if it is ok */
796 797 798
	if (unlikely(i2400m->trace_msg_from_user))
		wimax_msg(&i2400m->wimax_dev, "echo",
			  ack_l3l4_hdr, ack_len, GFP_KERNEL);
799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851
	result = i2400m_msg_size_check(i2400m, ack_l3l4_hdr, ack_len);
	if (result < 0) {
		dev_err(dev, "HW BUG? reply to message 0x%04x: %d\n",
			msg_type, result);
		goto error_bad_ack_len;
	}
	if (msg_type != le16_to_cpu(ack_l3l4_hdr->type)) {
		dev_err(dev, "HW BUG? bad reply 0x%04x to message 0x%04x\n",
			le16_to_cpu(ack_l3l4_hdr->type), msg_type);
		result = -EIO;
		goto error_bad_ack_type;
	}
	i2400m_msg_ack_hook(i2400m, ack_l3l4_hdr, ack_len);
	mutex_unlock(&i2400m->msg_mutex);
	d_fnend(3, dev, "(i2400m %p buf %p len %zu) = %p\n",
		i2400m, buf, buf_len, ack_skb);
	return ack_skb;

error_bad_ack_type:
error_bad_ack_len:
	kfree_skb(ack_skb);
error_ack_status:
error_wait_for_completion:
error_tx:
	mutex_unlock(&i2400m->msg_mutex);
error_bad_msg:
	d_fnend(3, dev, "(i2400m %p buf %p len %zu) = %d\n",
		i2400m, buf, buf_len, result);
	return ERR_PTR(result);
}


/*
 * Definitions for the Enter Power Save command
 *
 * The Enter Power Save command requests the device to go into power
 * saving mode. The device will ack or nak the command depending on it
 * being ready for it. If it acks, we tell the USB subsystem to
 *
 * As well, the device might request to go into power saving mode by
 * sending a report (REPORT_POWERSAVE_READY), in which case, we issue
 * this command. The hookups in the RX coder allow
 */
enum {
	I2400M_WAKEUP_ENABLED  = 0x01,
	I2400M_WAKEUP_DISABLED = 0x02,
	I2400M_TLV_TYPE_WAKEUP_MODE = 144,
};

struct i2400m_cmd_enter_power_save {
	struct i2400m_l3l4_hdr hdr;
	struct i2400m_tlv_hdr tlv;
	__le32 val;
852
} __packed;
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985


/*
 * Request entering power save
 *
 * This command is (mainly) executed when the device indicates that it
 * is ready to go into powersave mode via a REPORT_POWERSAVE_READY.
 */
int i2400m_cmd_enter_powersave(struct i2400m *i2400m)
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	struct sk_buff *ack_skb;
	struct i2400m_cmd_enter_power_save *cmd;
	char strerr[32];

	result = -ENOMEM;
	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (cmd == NULL)
		goto error_alloc;
	cmd->hdr.type = cpu_to_le16(I2400M_MT_CMD_ENTER_POWERSAVE);
	cmd->hdr.length = cpu_to_le16(sizeof(*cmd) - sizeof(cmd->hdr));
	cmd->hdr.version = cpu_to_le16(I2400M_L3L4_VERSION);
	cmd->tlv.type = cpu_to_le16(I2400M_TLV_TYPE_WAKEUP_MODE);
	cmd->tlv.length = cpu_to_le16(sizeof(cmd->val));
	cmd->val = cpu_to_le32(I2400M_WAKEUP_ENABLED);

	ack_skb = i2400m_msg_to_dev(i2400m, cmd, sizeof(*cmd));
	result = PTR_ERR(ack_skb);
	if (IS_ERR(ack_skb)) {
		dev_err(dev, "Failed to issue 'Enter power save' command: %d\n",
			result);
		goto error_msg_to_dev;
	}
	result = i2400m_msg_check_status(wimax_msg_data(ack_skb),
					 strerr, sizeof(strerr));
	if (result == -EACCES)
		d_printf(1, dev, "Cannot enter power save mode\n");
	else if (result < 0)
		dev_err(dev, "'Enter power save' (0x%04x) command failed: "
			"%d - %s\n", I2400M_MT_CMD_ENTER_POWERSAVE,
			result, strerr);
	else
		d_printf(1, dev, "device ready to power save\n");
	kfree_skb(ack_skb);
error_msg_to_dev:
	kfree(cmd);
error_alloc:
	return result;
}
EXPORT_SYMBOL_GPL(i2400m_cmd_enter_powersave);


/*
 * Definitions for getting device information
 */
enum {
	I2400M_TLV_DETAILED_DEVICE_INFO = 140
};

/**
 * i2400m_get_device_info - Query the device for detailed device information
 *
 * @i2400m: device descriptor
 *
 * Returns: an skb whose skb->data points to a 'struct
 *    i2400m_tlv_detailed_device_info'. When done, kfree_skb() it. The
 *    skb is *guaranteed* to contain the whole TLV data structure.
 *
 *    On error, IS_ERR(skb) is true and ERR_PTR(skb) is the error
 *    code.
 */
struct sk_buff *i2400m_get_device_info(struct i2400m *i2400m)
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	struct sk_buff *ack_skb;
	struct i2400m_l3l4_hdr *cmd;
	const struct i2400m_l3l4_hdr *ack;
	size_t ack_len;
	const struct i2400m_tlv_hdr *tlv;
	const struct i2400m_tlv_detailed_device_info *ddi;
	char strerr[32];

	ack_skb = ERR_PTR(-ENOMEM);
	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (cmd == NULL)
		goto error_alloc;
	cmd->type = cpu_to_le16(I2400M_MT_GET_DEVICE_INFO);
	cmd->length = 0;
	cmd->version = cpu_to_le16(I2400M_L3L4_VERSION);

	ack_skb = i2400m_msg_to_dev(i2400m, cmd, sizeof(*cmd));
	if (IS_ERR(ack_skb)) {
		dev_err(dev, "Failed to issue 'get device info' command: %ld\n",
			PTR_ERR(ack_skb));
		goto error_msg_to_dev;
	}
	ack = wimax_msg_data_len(ack_skb, &ack_len);
	result = i2400m_msg_check_status(ack, strerr, sizeof(strerr));
	if (result < 0) {
		dev_err(dev, "'get device info' (0x%04x) command failed: "
			"%d - %s\n", I2400M_MT_GET_DEVICE_INFO, result,
			strerr);
		goto error_cmd_failed;
	}
	tlv = i2400m_tlv_find(i2400m, ack->pl, ack_len - sizeof(*ack),
			      I2400M_TLV_DETAILED_DEVICE_INFO, sizeof(*ddi));
	if (tlv == NULL) {
		dev_err(dev, "GET DEVICE INFO: "
			"detailed device info TLV not found (0x%04x)\n",
			I2400M_TLV_DETAILED_DEVICE_INFO);
		result = -EIO;
		goto error_no_tlv;
	}
	skb_pull(ack_skb, (void *) tlv - (void *) ack_skb->data);
error_msg_to_dev:
	kfree(cmd);
error_alloc:
	return ack_skb;

error_no_tlv:
error_cmd_failed:
	kfree_skb(ack_skb);
	kfree(cmd);
	return ERR_PTR(result);
}


/* Firmware interface versions we support */
enum {
	I2400M_HDIv_MAJOR = 9,
	I2400M_HDIv_MINOR = 1,
986
	I2400M_HDIv_MINOR_2 = 2,
987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001
};


/**
 * i2400m_firmware_check - check firmware versions are compatible with
 * the driver
 *
 * @i2400m: device descriptor
 *
 * Returns: 0 if ok, < 0 errno code an error and a message in the
 *    kernel log.
 *
 * Long function, but quite simple; first chunk launches the command
 * and double checks the reply for the right TLV. Then we process the
 * TLV (where the meat is).
1002 1003 1004 1005
 *
 * Once we process the TLV that gives us the firmware's interface
 * version, we encode it and save it in i2400m->fw_version for future
 * reference.
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
 */
int i2400m_firmware_check(struct i2400m *i2400m)
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	struct sk_buff *ack_skb;
	struct i2400m_l3l4_hdr *cmd;
	const struct i2400m_l3l4_hdr *ack;
	size_t ack_len;
	const struct i2400m_tlv_hdr *tlv;
	const struct i2400m_tlv_l4_message_versions *l4mv;
	char strerr[32];
	unsigned major, minor, branch;

	result = -ENOMEM;
	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (cmd == NULL)
		goto error_alloc;
	cmd->type = cpu_to_le16(I2400M_MT_GET_LM_VERSION);
	cmd->length = 0;
	cmd->version = cpu_to_le16(I2400M_L3L4_VERSION);

	ack_skb = i2400m_msg_to_dev(i2400m, cmd, sizeof(*cmd));
	if (IS_ERR(ack_skb)) {
		result = PTR_ERR(ack_skb);
		dev_err(dev, "Failed to issue 'get lm version' command: %-d\n",
			result);
		goto error_msg_to_dev;
	}
	ack = wimax_msg_data_len(ack_skb, &ack_len);
	result = i2400m_msg_check_status(ack, strerr, sizeof(strerr));
	if (result < 0) {
		dev_err(dev, "'get lm version' (0x%04x) command failed: "
			"%d - %s\n", I2400M_MT_GET_LM_VERSION, result,
			strerr);
		goto error_cmd_failed;
	}
	tlv = i2400m_tlv_find(i2400m, ack->pl, ack_len - sizeof(*ack),
			      I2400M_TLV_L4_MESSAGE_VERSIONS, sizeof(*l4mv));
	if (tlv == NULL) {
		dev_err(dev, "get lm version: TLV not found (0x%04x)\n",
			I2400M_TLV_L4_MESSAGE_VERSIONS);
		result = -EIO;
		goto error_no_tlv;
	}
	l4mv = container_of(tlv, typeof(*l4mv), hdr);
	major = le16_to_cpu(l4mv->major);
	minor = le16_to_cpu(l4mv->minor);
	branch = le16_to_cpu(l4mv->branch);
	result = -EINVAL;
1056 1057
	if (major != I2400M_HDIv_MAJOR) {
		dev_err(dev, "unsupported major fw version "
1058 1059 1060 1061
			"%u.%u.%u\n", major, minor, branch);
		goto error_bad_major;
	}
	result = 0;
1062 1063
	if (minor < I2400M_HDIv_MINOR_2 && minor > I2400M_HDIv_MINOR)
		dev_warn(dev, "untested minor fw version %u.%u.%u\n",
1064
			 major, minor, branch);
1065 1066
	/* Yes, we ignore the branch -- we don't have to track it */
	i2400m->fw_version = major << 16 | minor;
1067 1068
	dev_info(dev, "firmware interface version %u.%u.%u\n",
		 major, minor, branch);
1069
error_bad_major:
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
error_no_tlv:
error_cmd_failed:
	kfree_skb(ack_skb);
error_msg_to_dev:
	kfree(cmd);
error_alloc:
	return result;
}


/*
 * Send an DoExitIdle command to the device to ask it to go out of
 * basestation-idle mode.
 *
 * @i2400m: device descriptor
 *
 * This starts a renegotiation with the basestation that might involve
 * another crypto handshake with user space.
 *
 * Returns: 0 if ok, < 0 errno code on error.
 */
int i2400m_cmd_exit_idle(struct i2400m *i2400m)
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	struct sk_buff *ack_skb;
	struct i2400m_l3l4_hdr *cmd;
	char strerr[32];

	result = -ENOMEM;
	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (cmd == NULL)
		goto error_alloc;
	cmd->type = cpu_to_le16(I2400M_MT_CMD_EXIT_IDLE);
	cmd->length = 0;
	cmd->version = cpu_to_le16(I2400M_L3L4_VERSION);

	ack_skb = i2400m_msg_to_dev(i2400m, cmd, sizeof(*cmd));
	result = PTR_ERR(ack_skb);
	if (IS_ERR(ack_skb)) {
		dev_err(dev, "Failed to issue 'exit idle' command: %d\n",
			result);
		goto error_msg_to_dev;
	}
	result = i2400m_msg_check_status(wimax_msg_data(ack_skb),
					 strerr, sizeof(strerr));
	kfree_skb(ack_skb);
error_msg_to_dev:
	kfree(cmd);
error_alloc:
	return result;

}


/*
 * Query the device for its state, update the WiMAX stack's idea of it
 *
 * @i2400m: device descriptor
 *
 * Returns: 0 if ok, < 0 errno code on error.
 *
 * Executes a 'Get State' command and parses the returned
 * TLVs.
 *
 * Because this is almost identical to a 'Report State', we use
 * i2400m_report_state_hook() to parse the answer. This will set the
 * carrier state, as well as the RF Kill switches state.
 */
1139
static int i2400m_cmd_get_state(struct i2400m *i2400m)
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	struct sk_buff *ack_skb;
	struct i2400m_l3l4_hdr *cmd;
	const struct i2400m_l3l4_hdr *ack;
	size_t ack_len;
	char strerr[32];

	result = -ENOMEM;
	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (cmd == NULL)
		goto error_alloc;
	cmd->type = cpu_to_le16(I2400M_MT_GET_STATE);
	cmd->length = 0;
	cmd->version = cpu_to_le16(I2400M_L3L4_VERSION);

	ack_skb = i2400m_msg_to_dev(i2400m, cmd, sizeof(*cmd));
	if (IS_ERR(ack_skb)) {
		dev_err(dev, "Failed to issue 'get state' command: %ld\n",
			PTR_ERR(ack_skb));
		result = PTR_ERR(ack_skb);
		goto error_msg_to_dev;
	}
	ack = wimax_msg_data_len(ack_skb, &ack_len);
	result = i2400m_msg_check_status(ack, strerr, sizeof(strerr));
	if (result < 0) {
		dev_err(dev, "'get state' (0x%04x) command failed: "
			"%d - %s\n", I2400M_MT_GET_STATE, result, strerr);
		goto error_cmd_failed;
	}
	i2400m_report_state_hook(i2400m, ack, ack_len - sizeof(*ack),
				 "GET STATE");
	result = 0;
	kfree_skb(ack_skb);
error_cmd_failed:
error_msg_to_dev:
	kfree(cmd);
error_alloc:
	return result;
}

/**
 * Set basic configuration settings
 *
 * @i2400m: device descriptor
 * @args: array of pointers to the TLV headers to send for
 *     configuration (each followed by its payload).
 *     TLV headers and payloads must be properly initialized, with the
 *     right endianess (LE).
 * @arg_size: number of pointers in the @args array
 */
1192 1193 1194
static int i2400m_set_init_config(struct i2400m *i2400m,
				  const struct i2400m_tlv_hdr **arg,
				  size_t args)
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	struct sk_buff *ack_skb;
	struct i2400m_l3l4_hdr *cmd;
	char strerr[32];
	unsigned argc, argsize, tlv_size;
	const struct i2400m_tlv_hdr *tlv_hdr;
	void *buf, *itr;

	d_fnstart(3, dev, "(i2400m %p arg %p args %zu)\n", i2400m, arg, args);
	result = 0;
	if (args == 0)
		goto none;
	/* Compute the size of all the TLVs, so we can alloc a
	 * contiguous command block to copy them. */
	argsize = 0;
	for (argc = 0; argc < args; argc++) {
		tlv_hdr = arg[argc];
		argsize += sizeof(*tlv_hdr) + le16_to_cpu(tlv_hdr->length);
	}
	WARN_ON(argc >= 9);	/* As per hw spec */

	/* Alloc the space for the command and TLVs*/
	result = -ENOMEM;
	buf = kzalloc(sizeof(*cmd) + argsize, GFP_KERNEL);
	if (buf == NULL)
		goto error_alloc;
	cmd = buf;
	cmd->type = cpu_to_le16(I2400M_MT_SET_INIT_CONFIG);
	cmd->length = cpu_to_le16(argsize);
	cmd->version = cpu_to_le16(I2400M_L3L4_VERSION);

	/* Copy the TLVs */
	itr = buf + sizeof(*cmd);
	for (argc = 0; argc < args; argc++) {
		tlv_hdr = arg[argc];
		tlv_size = sizeof(*tlv_hdr) + le16_to_cpu(tlv_hdr->length);
		memcpy(itr, tlv_hdr, tlv_size);
		itr += tlv_size;
	}

	/* Send the message! */
	ack_skb = i2400m_msg_to_dev(i2400m, buf, sizeof(*cmd) + argsize);
	result = PTR_ERR(ack_skb);
	if (IS_ERR(ack_skb)) {
		dev_err(dev, "Failed to issue 'init config' command: %d\n",
			result);

		goto error_msg_to_dev;
	}
	result = i2400m_msg_check_status(wimax_msg_data(ack_skb),
					 strerr, sizeof(strerr));
	if (result < 0)
		dev_err(dev, "'init config' (0x%04x) command failed: %d - %s\n",
			I2400M_MT_SET_INIT_CONFIG, result, strerr);
	kfree_skb(ack_skb);
error_msg_to_dev:
	kfree(buf);
error_alloc:
none:
	d_fnend(3, dev, "(i2400m %p arg %p args %zu) = %d\n",
		i2400m, arg, args, result);
	return result;

}

1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
/**
 * i2400m_set_idle_timeout - Set the device's idle mode timeout
 *
 * @i2400m: i2400m device descriptor
 *
 * @msecs: milliseconds for the timeout to enter idle mode. Between
 *     100 to 300000 (5m); 0 to disable. In increments of 100.
 *
 * After this @msecs of the link being idle (no data being sent or
 * received), the device will negotiate with the basestation entering
 * idle mode for saving power. The connection is maintained, but
 * getting out of it (done in tx.c) will require some negotiation,
 * possible crypto re-handshake and a possible DHCP re-lease.
 *
 * Only available if fw_version >= 0x00090002.
 *
 * Returns: 0 if ok, < 0 errno code on error.
 */
int i2400m_set_idle_timeout(struct i2400m *i2400m, unsigned msecs)
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	struct sk_buff *ack_skb;
	struct {
		struct i2400m_l3l4_hdr hdr;
		struct i2400m_tlv_config_idle_timeout cit;
	} *cmd;
	const struct i2400m_l3l4_hdr *ack;
	size_t ack_len;
	char strerr[32];

	result = -ENOSYS;
	if (i2400m_le_v1_3(i2400m))
		goto error_alloc;
	result = -ENOMEM;
	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (cmd == NULL)
		goto error_alloc;
	cmd->hdr.type = cpu_to_le16(I2400M_MT_GET_STATE);
	cmd->hdr.length = cpu_to_le16(sizeof(*cmd) - sizeof(cmd->hdr));
	cmd->hdr.version = cpu_to_le16(I2400M_L3L4_VERSION);

	cmd->cit.hdr.type =
		cpu_to_le16(I2400M_TLV_CONFIG_IDLE_TIMEOUT);
	cmd->cit.hdr.length = cpu_to_le16(sizeof(cmd->cit.timeout));
	cmd->cit.timeout = cpu_to_le32(msecs);

	ack_skb = i2400m_msg_to_dev(i2400m, cmd, sizeof(*cmd));
	if (IS_ERR(ack_skb)) {
		dev_err(dev, "Failed to issue 'set idle timeout' command: "
			"%ld\n", PTR_ERR(ack_skb));
		result = PTR_ERR(ack_skb);
		goto error_msg_to_dev;
	}
	ack = wimax_msg_data_len(ack_skb, &ack_len);
	result = i2400m_msg_check_status(ack, strerr, sizeof(strerr));
	if (result < 0) {
		dev_err(dev, "'set idle timeout' (0x%04x) command failed: "
			"%d - %s\n", I2400M_MT_GET_STATE, result, strerr);
		goto error_cmd_failed;
	}
	result = 0;
	kfree_skb(ack_skb);
error_cmd_failed:
error_msg_to_dev:
	kfree(cmd);
error_alloc:
	return result;
}


1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350
/**
 * i2400m_dev_initialize - Initialize the device once communications are ready
 *
 * @i2400m: device descriptor
 *
 * Returns: 0 if ok, < 0 errno code on error.
 *
 * Configures the device to work the way we like it.
 *
 * At the point of this call, the device is registered with the WiMAX
 * and netdev stacks, firmware is uploaded and we can talk to the
 * device normally.
 */
int i2400m_dev_initialize(struct i2400m *i2400m)
{
	int result;
	struct device *dev = i2400m_dev(i2400m);
	struct i2400m_tlv_config_idle_parameters idle_params;
1351
	struct i2400m_tlv_config_idle_timeout idle_timeout;
1352
	struct i2400m_tlv_config_d2h_data_format df;
1353
	struct i2400m_tlv_config_dl_host_reorder dlhr;
1354 1355 1356 1357
	const struct i2400m_tlv_hdr *args[9];
	unsigned argc = 0;

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
1358 1359
	if (i2400m_passive_mode)
		goto out_passive;
1360
	/* Disable idle mode? (enabled by default) */
1361
	if (i2400m_idle_mode_disabled) {
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
		if (i2400m_le_v1_3(i2400m)) {
			idle_params.hdr.type =
				cpu_to_le16(I2400M_TLV_CONFIG_IDLE_PARAMETERS);
			idle_params.hdr.length = cpu_to_le16(
				sizeof(idle_params) - sizeof(idle_params.hdr));
			idle_params.idle_timeout = 0;
			idle_params.idle_paging_interval = 0;
			args[argc++] = &idle_params.hdr;
		} else {
			idle_timeout.hdr.type =
				cpu_to_le16(I2400M_TLV_CONFIG_IDLE_TIMEOUT);
			idle_timeout.hdr.length = cpu_to_le16(
				sizeof(idle_timeout) - sizeof(idle_timeout.hdr));
			idle_timeout.timeout = 0;
			args[argc++] = &idle_timeout.hdr;
		}
1378
	}
1379
	if (i2400m_ge_v1_4(i2400m)) {
1380
		/* Enable extended RX data format? */
1381 1382 1383 1384 1385 1386
		df.hdr.type =
			cpu_to_le16(I2400M_TLV_CONFIG_D2H_DATA_FORMAT);
		df.hdr.length = cpu_to_le16(
			sizeof(df) - sizeof(df.hdr));
		df.format = 1;
		args[argc++] = &df.hdr;
1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397

		/* Enable RX data reordering?
		 * (switch flipped in rx.c:i2400m_rx_setup() after fw upload) */
		if (i2400m->rx_reorder) {
			dlhr.hdr.type =
				cpu_to_le16(I2400M_TLV_CONFIG_DL_HOST_REORDER);
			dlhr.hdr.length = cpu_to_le16(
				sizeof(dlhr) - sizeof(dlhr.hdr));
			dlhr.reorder = 1;
			args[argc++] = &dlhr.hdr;
		}
1398
	}
1399 1400 1401
	result = i2400m_set_init_config(i2400m, args, argc);
	if (result < 0)
		goto error;
1402
out_passive:
1403 1404 1405 1406 1407 1408 1409 1410
	/*
	 * Update state: Here it just calls a get state; parsing the
	 * result (System State TLV and RF Status TLV [done in the rx
	 * path hooks]) will set the hardware and software RF-Kill
	 * status.
	 */
	result = i2400m_cmd_get_state(i2400m);
error:
1411 1412
	if (result < 0)
		dev_err(dev, "failed to initialize the device: %d\n", result);
1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
	d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
	return result;
}


/**
 * i2400m_dev_shutdown - Shutdown a running device
 *
 * @i2400m: device descriptor
 *
1423 1424 1425 1426
 * Release resources acquired during the running of the device; in
 * theory, should also tell the device to go to sleep, switch off the
 * radio, all that, but at this point, in most cases (driver
 * disconnection, reset handling) we can't even talk to the device.
1427 1428 1429 1430 1431 1432
 */
void i2400m_dev_shutdown(struct i2400m *i2400m)
{
	struct device *dev = i2400m_dev(i2400m);

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
1433
	d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
1434
}