summaryrefslogtreecommitdiffstats
path: root/drivers/net/wimax/i2400m/usb.c
blob: 16341ffc3df30de6bac85725b10be2a3b2fff95d (plain)
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
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
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
/*
 * Intel Wireless WiMAX Connection 2400m
 * Linux driver model glue for USB device, reset & fw upload
 *
 *
 * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com>
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 * Yanir Lubetkin <yanirx.lubetkin@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-usb.h for a general description of this driver.
 *
 * This file implements driver model glue, and hook ups for the
 * generic driver to implement the bus-specific functions (device
 * communication setup/tear down, firmware upload and resetting).
 *
 * ROADMAP
 *
 * i2400mu_probe()
 *   alloc_netdev()...
 *     i2400mu_netdev_setup()
 *       i2400mu_init()
 *       i2400m_netdev_setup()
 *   i2400m_setup()...
 *
 * i2400mu_disconnect
 *   i2400m_release()
 *   free_netdev()
 *
 * i2400mu_suspend()
 *   i2400m_cmd_enter_powersave()
 *   i2400mu_notification_release()
 *
 * i2400mu_resume()
 *   i2400mu_notification_setup()
 *
 * i2400mu_bus_dev_start()        Called by i2400m_dev_start() [who is
 *   i2400mu_tx_setup()           called by i2400m_setup()]
 *   i2400mu_rx_setup()
 *   i2400mu_notification_setup()
 *
 * i2400mu_bus_dev_stop()         Called by i2400m_dev_stop() [who is
 *   i2400mu_notification_release()  called by i2400m_release()]
 *   i2400mu_rx_release()
 *   i2400mu_tx_release()
 *
 * i2400mu_bus_reset()            Called by i2400m_reset
 *   __i2400mu_reset()
 *     __i2400mu_send_barker()
 *   usb_reset_device()
 */
#include "i2400m-usb.h"
#include <linux/wimax/i2400m.h>
#include <linux/debugfs.h>
#include <linux/slab.h>


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

static char i2400mu_debug_params[128];
module_param_string(debug, i2400mu_debug_params, sizeof(i2400mu_debug_params),
		    0644);
MODULE_PARM_DESC(debug,
		 "String of space-separated NAME:VALUE pairs, where NAMEs "
		 "are the different debug submodules and VALUE are the "
		 "initial debug value to set.");

/* Our firmware file name */
static const char *i2400mu_bus_fw_names_5x50[] = {
#define I2400MU_FW_FILE_NAME_v1_5 "i2400m-fw-usb-1.5.sbcf"
	I2400MU_FW_FILE_NAME_v1_5,
#define I2400MU_FW_FILE_NAME_v1_4 "i2400m-fw-usb-1.4.sbcf"
	I2400MU_FW_FILE_NAME_v1_4,
	NULL,
};


static const char *i2400mu_bus_fw_names_6050[] = {
#define I6050U_FW_FILE_NAME_v1_5 "i6050-fw-usb-1.5.sbcf"
	I6050U_FW_FILE_NAME_v1_5,
	NULL,
};


static
int i2400mu_bus_dev_start(struct i2400m *i2400m)
{
	int result;
	struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
	struct device *dev = &i2400mu->usb_iface->dev;

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
	result = i2400mu_tx_setup(i2400mu);
	if (result < 0)
		goto error_usb_tx_setup;
	result = i2400mu_rx_setup(i2400mu);
	if (result < 0)
		goto error_usb_rx_setup;
	result = i2400mu_notification_setup(i2400mu);
	if (result < 0)
		goto error_notif_setup;
	d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result);
	return result;

error_notif_setup:
	i2400mu_rx_release(i2400mu);
error_usb_rx_setup:
	i2400mu_tx_release(i2400mu);
error_usb_tx_setup:
	d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
	return result;
}


static
void i2400mu_bus_dev_stop(struct i2400m *i2400m)
{
	struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
	struct device *dev = &i2400mu->usb_iface->dev;

	d_fnstart(3, dev, "(i2400m %p)\n", i2400m);
	i2400mu_notification_release(i2400mu);
	i2400mu_rx_release(i2400mu);
	i2400mu_tx_release(i2400mu);
	d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
}


/*
 * Sends a barker buffer to the device
 *
 * This helper will allocate a kmalloced buffer and use it to transmit
 * (then free it). Reason for this is that other arches cannot use
 * stack/vmalloc/text areas for DMA transfers.
 *
 * Error recovery here is simpler: anything is considered a hard error
 * and will move the reset code to use a last-resort bus-based reset.
 */
static
int __i2400mu_send_barker(struct i2400mu *i2400mu,
			  const __le32 *barker,
			  size_t barker_size,
			  unsigned endpoint)
{
	struct usb_endpoint_descriptor *epd = NULL;
	int pipe, actual_len, ret;
	struct device *dev = &i2400mu->usb_iface->dev;
	void *buffer;
	int do_autopm = 1;

	ret = usb_autopm_get_interface(i2400mu->usb_iface);
	if (ret < 0) {
		dev_err(dev, "RESET: can't get autopm: %d\n", ret);
		do_autopm = 0;
	}
	ret = -ENOMEM;
	buffer = kmalloc(barker_size, GFP_KERNEL);
	if (buffer == NULL)
		goto error_kzalloc;
	epd = usb_get_epd(i2400mu->usb_iface, endpoint);
	pipe = usb_sndbulkpipe(i2400mu->usb_dev, epd->bEndpointAddress);
	memcpy(buffer, barker, barker_size);
retry:
	ret = usb_bulk_msg(i2400mu->usb_dev, pipe, buffer, barker_size,
			   &actual_len, 200);
	switch (ret) {
	case 0:
		if (actual_len != barker_size) {	/* Too short? drop it */
			dev_err(dev, "E: %s: short write (%d B vs %zu "
				"expected)\n",
				__func__, actual_len, barker_size);
			ret = -EIO;
		}
		break;
	case -EPIPE:
		/*
		 * Stall -- maybe the device is choking with our
		 * requests. Clear it and give it some time. If they
		 * happen to often, it might be another symptom, so we
		 * reset.
		 *
		 * No error handling for usb_clear_halt(0; if it
		 * works, the retry works; if it fails, this switch
		 * does the error handling for us.
		 */
		if (edc_inc(&i2400mu->urb_edc,
			    10 * EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
			dev_err(dev, "E: %s: too many stalls in "
				"URB; resetting device\n", __func__);
			usb_queue_reset_device(i2400mu->usb_iface);
			/* fallthrough */
		} else {
			usb_clear_halt(i2400mu->usb_dev, pipe);
			msleep(10);	/* give the device some time */
			goto retry;
		}
	case -EINVAL:			/* while removing driver */
	case -ENODEV:			/* dev disconnect ... */
	case -ENOENT:			/* just ignore it */
	case -ESHUTDOWN:		/* and exit */
	case -ECONNRESET:
		ret = -ESHUTDOWN;
		break;
	default:			/* Some error? */
		if (edc_inc(&i2400mu->urb_edc,
			    EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
			dev_err(dev, "E: %s: maximum errors in URB "
				"exceeded; resetting device\n",
				__func__);
			usb_queue_reset_device(i2400mu->usb_iface);
		} else {
			dev_warn(dev, "W: %s: cannot send URB: %d\n",
				 __func__, ret);
			goto retry;
		}
	}
	kfree(buffer);
error_kzalloc:
	if (do_autopm)
		usb_autopm_put_interface(i2400mu->usb_iface);
	return ret;
}


/*
 * Reset a device at different levels (warm, cold or bus)
 *
 * @i2400m: device descriptor
 * @reset_type: soft, warm or bus reset (I2400M_RT_WARM/SOFT/BUS)
 *
 * Warm and cold resets get a USB reset if they fail.
 *
 * Warm reset:
 *
 * The device will be fully reset internally, but won't be
 * disconnected from the USB bus (so no reenumeration will
 * happen). Firmware upload will be necessary.
 *
 * The device will send a reboot barker in the notification endpoint
 * that will trigger the driver to reinitialize the state
 * automatically from notif.c:i2400m_notification_grok() into
 * i2400m_dev_bootstrap_delayed().
 *
 * Cold and bus (USB) reset:
 *
 * The device will be fully reset internally, disconnected from the
 * USB bus an a reenumeration will happen. Firmware upload will be
 * necessary. Thus, we don't do any locking or struct
 * reinitialization, as we are going to be fully disconnected and
 * reenumerated.
 *
 * Note we need to return -ENODEV if a warm reset was requested and we
 * had to resort to a bus reset. See i2400m_op_reset(), wimax_reset()
 * and wimax_dev->op_reset.
 *
 * WARNING: no driver state saved/fixed
 */
static
int i2400mu_bus_reset(struct i2400m *i2400m, enum i2400m_reset_type rt)
{
	int result;
	struct i2400mu *i2400mu =
		container_of(i2400m, struct i2400mu, i2400m);
	struct device *dev = i2400m_dev(i2400m);
	static const __le32 i2400m_WARM_BOOT_BARKER[4] = {
		cpu_to_le32(I2400M_WARM_RESET_BARKER),
		cpu_to_le32(I2400M_WARM_RESET_BARKER),
		cpu_to_le32(I2400M_WARM_RESET_BARKER),
		cpu_to_le32(I2400M_WARM_RESET_BARKER),
	};
	static const __le32 i2400m_COLD_BOOT_BARKER[4] = {
		cpu_to_le32(I2400M_COLD_RESET_BARKER),
		cpu_to_le32(I2400M_COLD_RESET_BARKER),
		cpu_to_le32(I2400M_COLD_RESET_BARKER),
		cpu_to_le32(I2400M_COLD_RESET_BARKER),
	};

	d_fnstart(3, dev, "(i2400m %p rt %u)\n", i2400m, rt);
	if (rt == I2400M_RT_WARM)
		result = __i2400mu_send_barker(
			i2400mu, i2400m_WARM_BOOT_BARKER,
			sizeof(i2400m_WARM_BOOT_BARKER),
			i2400mu->endpoint_cfg.bulk_out);
	else if (rt == I2400M_RT_COLD)
		result = __i2400mu_send_barker(
			i2400mu, i2400m_COLD_BOOT_BARKER,
			sizeof(i2400m_COLD_BOOT_BARKER),
			i2400mu->endpoint_cfg.reset_cold);
	else if (rt == I2400M_RT_BUS) {
		result = usb_reset_device(i2400mu->usb_dev);
		switch (result) {
		case 0:
		case -EINVAL:	/* device is gone */
		case -ENODEV:
		case -ENOENT:
		case -ESHUTDOWN:
			result = 0;
			break;	/* We assume the device is disconnected */
		default:
			dev_err(dev, "USB reset failed (%d), giving up!\n",
				result);
		}
	} else {
		result = -EINVAL;	/* shut gcc up in certain arches */
		BUG();
	}
	if (result < 0
	    && result != -EINVAL	/* device is gone */
	    && rt != I2400M_RT_BUS) {
		/*
		 * Things failed -- resort to lower level reset, that
		 * we queue in another context; the reason for this is
		 * that the pre and post reset functionality requires
		 * the i2400m->init_mutex; RT_WARM and RT_COLD can
		 * come from areas where i2400m->init_mutex is taken.
		 */
		dev_err(dev, "%s reset failed (%d); trying USB reset\n",
			rt == I2400M_RT_WARM ? "warm" : "cold", result);
		usb_queue_reset_device(i2400mu->usb_iface);
		result = -ENODEV;
	}
	d_fnend(3, dev, "(i2400m %p rt %u) = %d\n", i2400m, rt, result);
	return result;
}


static
void i2400mu_netdev_setup(struct net_device *net_dev)
{
	struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
	struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m);
	i2400mu_init(i2400mu);
	i2400m_netdev_setup(net_dev);
}


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


#define __debugfs_register(prefix, name, parent)			\
do {									\
	result = d_level_register_debugfs(prefix, name, parent);	\
	if (result < 0)							\
		goto error;						\
} while (0)


static
int i2400mu_debugfs_add(struct i2400mu *i2400mu)
{
	int result;
	struct device *dev = &i2400mu->usb_iface->dev;
	struct dentry *dentry = i2400mu->i2400m.wimax_dev.debugfs_dentry;
	struct dentry *fd;

	dentry = debugfs_create_dir("i2400m-usb", dentry);
	result = PTR_ERR(dentry);
	if (IS_ERR(dentry)) {
		if (result == -ENODEV)
			result = 0;	/* No debugfs support */
		goto error;
	}
	i2400mu->debugfs_dentry = dentry;
	__debugfs_register("dl_", usb, dentry);
	__debugfs_register("dl_", fw, dentry);
	__debugfs_register("dl_", notif, dentry);
	__debugfs_register("dl_", rx, dentry);
	__debugfs_register("dl_", tx, dentry);

	/* Don't touch these if you don't know what you are doing */
	fd = debugfs_create_u8("rx_size_auto_shrink", 0600, dentry,
			       &i2400mu->rx_size_auto_shrink);
	result = PTR_ERR(fd);
	if (IS_ERR(fd) && result != -ENODEV) {
		dev_err(dev, "Can't create debugfs entry "
			"rx_size_auto_shrink: %d\n", result);
		goto error;
	}

	fd = debugfs_create_size_t("rx_size", 0600, dentry,
				   &i2400mu->rx_size);
	result = PTR_ERR(fd);
	if (IS_ERR(fd) && result != -ENODEV) {
		dev_err(dev, "Can't create debugfs entry "
			"rx_size: %d\n", result);
		goto error;
	}

	return 0;

error:
	debugfs_remove_recursive(i2400mu->debugfs_dentry);
	return result;
}


static struct device_type i2400mu_type = {
	.name	= "wimax",
};

/*
 * Probe a i2400m interface and register it
 *
 * @iface:   USB interface to link to
 * @id:      USB class/subclass/protocol id
 * @returns: 0 if ok, < 0 errno code on error.
 *
 * Alloc a net device, initialize the bus-specific details and then
 * calls the bus-generic initialization routine. That will register
 * the wimax and netdev devices, upload the firmware [using
 * _bus_bm_*()], call _bus_dev_start() to finalize the setup of the
 * communication with the device and then will start to talk to it to
 * finnish setting it up.
 */
static
int i2400mu_probe(struct usb_interface *iface,
		  const struct usb_device_id *id)
{
	int result;
	struct net_device *net_dev;
	struct device *dev = &iface->dev;
	struct i2400m *i2400m;
	struct i2400mu *i2400mu;
	struct usb_device *usb_dev = interface_to_usbdev(iface);

	if (usb_dev->speed != USB_SPEED_HIGH)
		dev_err(dev, "device not connected as high speed\n");

	/* Allocate instance [calls i2400m_netdev_setup() on it]. */
	result = -ENOMEM;
	net_dev = alloc_netdev(sizeof(*i2400mu), "wmx%d",
			       i2400mu_netdev_setup);
	if (net_dev == NULL) {
		dev_err(dev, "no memory for network device instance\n");
		goto error_alloc_netdev;
	}
	SET_NETDEV_DEV(net_dev, dev);
	SET_NETDEV_DEVTYPE(net_dev, &i2400mu_type);
	i2400m = net_dev_to_i2400m(net_dev);
	i2400mu = container_of(i2400m, struct i2400mu, i2400m);
	i2400m->wimax_dev.net_dev = net_dev;
	i2400mu->usb_dev = usb_get_dev(usb_dev);
	i2400mu->usb_iface = iface;
	usb_set_intfdata(iface, i2400mu);

	i2400m->bus_tx_block_size = I2400MU_BLK_SIZE;
	/*
	 * Room required in the Tx queue for USB message to accommodate
	 * a smallest payload while allocating header space is 16 bytes.
	 * Adding this room  for the new tx message increases the
	 * possibilities of including any payload with size <= 16 bytes.
	 */
	i2400m->bus_tx_room_min = I2400MU_BLK_SIZE;
	i2400m->bus_pl_size_max = I2400MU_PL_SIZE_MAX;
	i2400m->bus_setup = NULL;
	i2400m->bus_dev_start = i2400mu_bus_dev_start;
	i2400m->bus_dev_stop = i2400mu_bus_dev_stop;
	i2400m->bus_release = NULL;
	i2400m->bus_tx_kick = i2400mu_bus_tx_kick;
	i2400m->bus_reset = i2400mu_bus_reset;
	i2400m->bus_bm_retries = I2400M_USB_BOOT_RETRIES;
	i2400m->bus_bm_cmd_send = i2400mu_bus_bm_cmd_send;
	i2400m->bus_bm_wait_for_ack = i2400mu_bus_bm_wait_for_ack;
	i2400m->bus_bm_mac_addr_impaired = 0;

	switch (id->idProduct) {
	case USB_DEVICE_ID_I6050:
	case USB_DEVICE_ID_I6050_2:
		i2400mu->i6050 = 1;
		break;
	default:
		break;
	}

	if (i2400mu->i6050) {
		i2400m->bus_fw_names = i2400mu_bus_fw_names_6050;
		i2400mu->endpoint_cfg.bulk_out = 0;
		i2400mu->endpoint_cfg.notification = 3;
		i2400mu->endpoint_cfg.reset_cold = 2;
		i2400mu->endpoint_cfg.bulk_in = 1;
	} else {
		i2400m->bus_fw_names = i2400mu_bus_fw_names_5x50;
		i2400mu->endpoint_cfg.bulk_out = 0;
		i2400mu->endpoint_cfg.notification = 1;
		i2400mu->endpoint_cfg.reset_cold = 2;
		i2400mu->endpoint_cfg.bulk_in = 3;
	}
#ifdef CONFIG_PM
	iface->needs_remote_wakeup = 1;		/* autosuspend (15s delay) */
	device_init_wakeup(dev, 1);
	usb_dev->autosuspend_delay = 15 * HZ;
	usb_dev->autosuspend_disabled = 0;
#endif

	result = i2400m_setup(i2400m, I2400M_BRI_MAC_REINIT);
	if (result < 0) {
		dev_err(dev, "cannot setup device: %d\n", result);
		goto error_setup;
	}
	result = i2400mu_debugfs_add(i2400mu);
	if (result < 0) {
		dev_err(dev, "Can't register i2400mu's debugfs: %d\n", result);
		goto error_debugfs_add;
	}
	return 0;

error_debugfs_add:
	i2400m_release(i2400m);
error_setup:
	usb_set_intfdata(iface, NULL);
	usb_put_dev(i2400mu->usb_dev);
	free_netdev(net_dev);
error_alloc_netdev:
	return result;
}


/*
 * Disconect a i2400m from the system.
 *
 * i2400m_stop() has been called before, so al the rx and tx contexts
 * have been taken down already. Make sure the queue is stopped,
 * unregister netdev and i2400m, free and kill.
 */
static
void i2400mu_disconnect(struct usb_interface *iface)
{
	struct i2400mu *i2400mu = usb_get_intfdata(iface);
	struct i2400m *i2400m = &i2400mu->i2400m;
	struct net_device *net_dev = i2400m->wimax_dev.net_dev;
	struct device *dev = &iface->dev;

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

	debugfs_remove_recursive(i2400mu->debugfs_dentry);
	i2400m_release(i2400m);
	usb_set_intfdata(iface, NULL);
	usb_put_dev(i2400mu->usb_dev);
	free_netdev(net_dev);
	d_fnend(3, dev, "(iface %p i2400m %p) = void\n", iface, i2400m);
}


/*
 * Get the device ready for USB port or system standby and hibernation
 *
 * USB port and system standby are handled the same.
 *
 * When the system hibernates, the USB device is powered down and then
 * up, so we don't really have to do much here, as it will be seen as
 * a reconnect. Still for simplicity we consider this case the same as
 * suspend, so that the device has a chance to do notify the base
 * station (if connected).
 *
 * So at the end, the three cases require common handling.
 *
 * If at the time of this call the device's firmware is not loaded,
 * nothing has to be done. Note we can be "loose" about not reading
 * i2400m->updown under i2400m->init_mutex. If it happens to change
 * inmediately, other parts of the call flow will fail and effectively
 * catch it.
 *
 * If the firmware is loaded, we need to:
 *
 *  - tell the device to go into host interface power save mode, wait
 *    for it to ack
 *
 *    This is quite more interesting than it is; we need to execute a
 *    command, but this time, we don't want the code in usb-{tx,rx}.c
 *    to call the usb_autopm_get/put_interface() barriers as it'd
 *    deadlock, so we need to decrement i2400mu->do_autopm, that acts
 *    as a poor man's semaphore. Ugly, but it works.
 *
 *    As well, the device might refuse going to sleep for whichever
 *    reason. In this case we just fail. For system suspend/hibernate,
 *    we *can't* fail. We check PM_EVENT_AUTO to see if the
 *    suspend call comes from the USB stack or from the system and act
 *    in consequence.
 *
 *  - stop the notification endpoint polling
 */
static
int i2400mu_suspend(struct usb_interface *iface, pm_message_t pm_msg)
{
	int result = 0;
	struct device *dev = &iface->dev;
	struct i2400mu *i2400mu = usb_get_intfdata(iface);
	unsigned is_autosuspend = 0;
	struct i2400m *i2400m = &i2400mu->i2400m;

#ifdef CONFIG_PM
	if (pm_msg.event & PM_EVENT_AUTO)
		is_autosuspend = 1;
#endif

	d_fnstart(3, dev, "(iface %p pm_msg %u)\n", iface, pm_msg.event);
	rmb();		/* see i2400m->updown's documentation  */
	if (i2400m->updown == 0)
		goto no_firmware;
	if (i2400m->state == I2400M_SS_DATA_PATH_CONNECTED && is_autosuspend) {
		/* ugh -- the device is connected and this suspend
		 * request is an autosuspend one (not a system standby
		 * / hibernate).
		 *
		 * The only way the device can go to standby is if the
		 * link with the base station is in IDLE mode; that
		 * were the case, we'd be in status
		 * I2400M_SS_CONNECTED_IDLE. But we are not.
		 *
		 * If we *tell* him to go power save now, it'll reset
		 * as a precautionary measure, so if this is an
		 * autosuspend thing, say no and it'll come back
		 * later, when the link is IDLE
		 */
		result = -EBADF;
		d_printf(1, dev, "fw up, link up, not-idle, autosuspend: "
			 "not entering powersave\n");
		goto error_not_now;
	}
	d_printf(1, dev, "fw up: entering powersave\n");
	atomic_dec(&i2400mu->do_autopm);
	result = i2400m_cmd_enter_powersave(i2400m);
	atomic_inc(&i2400mu->do_autopm);
	if (result < 0 && !is_autosuspend) {
		/* System suspend, can't fail */
		dev_err(dev, "failed to suspend, will reset on resume\n");
		result = 0;
	}
	if (result < 0)
		goto error_enter_powersave;
	i2400mu_notification_release(i2400mu);
	d_printf(1, dev, "powersave requested\n");
error_enter_powersave:
error_not_now:
no_firmware:
	d_fnend(3, dev, "(iface %p pm_msg %u) = %d\n",
		iface, pm_msg.event, result);
	return result;
}


static
int i2400mu_resume(struct usb_interface *iface)
{
	int ret = 0;
	struct device *dev = &iface->dev;
	struct i2400mu *i2400mu = usb_get_intfdata(iface);
	struct i2400m *i2400m = &i2400mu->i2400m;

	d_fnstart(3, dev, "(iface %p)\n", iface);
	rmb();		/* see i2400m->updown's documentation  */
	if (i2400m->updown == 0) {
		d_printf(1, dev, "fw was down, no resume neeed\n");
		goto out;
	}
	d_printf(1, dev, "fw was up, resuming\n");
	i2400mu_notification_setup(i2400mu);
	/* USB has flow control, so we don't need to give it time to
	 * come back; otherwise, we'd use something like a get-state
	 * command... */
out:
	d_fnend(3, dev, "(iface %p) = %d\n", iface, ret);
	return ret;
}


static
int i2400mu_reset_resume(struct usb_interface *iface)
{
	int result;
	struct device *dev = &iface->dev;
	struct i2400mu *i2400mu = usb_get_intfdata(iface);
	struct i2400m *i2400m = &i2400mu->i2400m;

	d_fnstart(3, dev, "(iface %p)\n", iface);
	result = i2400m_dev_reset_handle(i2400m, "device reset on resume");
	d_fnend(3, dev, "(iface %p) = %d\n", iface, result);
	return result < 0 ? result : 0;
}


/*
 * Another driver or user space is triggering a reset on the device
 * which contains the interface passed as an argument. Cease IO and
 * save any device state you need to restore.
 *
 * If you need to allocate memory here, use GFP_NOIO or GFP_ATOMIC, if
 * you are in atomic context.
 */
static
int i2400mu_pre_reset(struct usb_interface *iface)
{
	struct i2400mu *i2400mu = usb_get_intfdata(iface);
	return i2400m_pre_reset(&i2400mu->i2400m);
}


/*
 * The reset has completed.  Restore any saved device state and begin
 * using the device again.
 *
 * If you need to allocate memory here, use GFP_NOIO or GFP_ATOMIC, if
 * you are in atomic context.
 */
static
int i2400mu_post_reset(struct usb_interface *iface)
{
	struct i2400mu *i2400mu = usb_get_intfdata(iface);
	return i2400m_post_reset(&i2400mu->i2400m);
}


static
struct usb_device_id i2400mu_id_table[] = {
	{ USB_DEVICE(0x8086, USB_DEVICE_ID_I6050) },
	{ USB_DEVICE(0x8086, USB_DEVICE_ID_I6050_2) },
	{ USB_DEVICE(0x8086, 0x0181) },
	{ USB_DEVICE(0x8086, 0x1403) },
	{ USB_DEVICE(0x8086, 0x1405) },
	{ USB_DEVICE(0x8086, 0x0180) },
	{ USB_DEVICE(0x8086, 0x0182) },
	{ USB_DEVICE(0x8086, 0x1406) },
	{ USB_DEVICE(0x8086, 0x1403) },
	{ },
};
MODULE_DEVICE_TABLE(usb, i2400mu_id_table);


static
struct usb_driver i2400mu_driver = {
	.name = KBUILD_MODNAME,
	.suspend = i2400mu_suspend,
	.resume = i2400mu_resume,
	.reset_resume = i2400mu_reset_resume,
	.probe = i2400mu_probe,
	.disconnect = i2400mu_disconnect,
	.pre_reset = i2400mu_pre_reset,
	.post_reset = i2400mu_post_reset,
	.id_table = i2400mu_id_table,
	.supports_autosuspend = 1,
};

static
int __init i2400mu_driver_init(void)
{
	d_parse_params(D_LEVEL, D_LEVEL_SIZE, i2400mu_debug_params,
		       "i2400m_usb.debug");
	return usb_register(&i2400mu_driver);
}
module_init(i2400mu_driver_init);


static
void __exit i2400mu_driver_exit(void)
{
	flush_scheduled_work();	/* for the stuff we schedule from sysfs.c */
	usb_deregister(&i2400mu_driver);
}
module_exit(i2400mu_driver_exit);

MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
MODULE_DESCRIPTION("Driver for USB based Intel Wireless WiMAX Connection 2400M "
		   "(5x50 & 6050)");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE(I2400MU_FW_FILE_NAME_v1_5);
MODULE_FIRMWARE(I6050U_FW_FILE_NAME_v1_5);
OpenPOWER on IntegriCloud