summaryrefslogtreecommitdiffstats
path: root/drivers/usb/wusbcore/rh.c
blob: c175b7300c7368016deb5118a579fe3b6073fde5 (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
/*
 * Wireless USB Host Controller
 * Root Hub operations
 *
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * 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.
 *
 *
 * We fake a root hub that has fake ports (as many as simultaneous
 * devices the Wireless USB Host Controller can deal with). For each
 * port we keep an state in @wusbhc->port[index] identical to the one
 * specified in the USB2.0[ch11] spec and some extra device
 * information that complements the one in 'struct usb_device' (as
 * this lacs a hcpriv pointer).
 *
 * Note this is common to WHCI and HWA host controllers.
 *
 * Through here we enable most of the state changes that the USB stack
 * will use to connect or disconnect devices. We need to do some
 * forced adaptation of Wireless USB device states vs. wired:
 *
 *        USB:                 WUSB:
 *
 * Port   Powered-off          port slot n/a
 *        Powered-on           port slot available
 *        Disconnected         port slot available
 *        Connected            port slot assigned device
 *        		       device sent DN_Connect
 *                             device was authenticated
 *        Enabled              device is authenticated, transitioned
 *                             from unauth -> auth -> default address
 *                             -> enabled
 *        Reset                disconnect
 *        Disable              disconnect
 *
 * This maps the standard USB port states with the WUSB device states
 * so we can fake ports without having to modify the USB stack.
 *
 * FIXME: this process will change in the future
 *
 *
 * ENTRY POINTS
 *
 * Our entry points into here are, as in hcd.c, the USB stack root hub
 * ops defined in the usb_hcd struct:
 *
 * wusbhc_rh_status_data()	Provide hub and port status data bitmap
 *
 * wusbhc_rh_control()          Execution of all the major requests
 *                              you can do to a hub (Set|Clear
 *                              features, get descriptors, status, etc).
 *
 * wusbhc_rh_[suspend|resume]() That
 *
 * wusbhc_rh_start_port_reset() ??? unimplemented
 */
#include <linux/slab.h>
#include "wusbhc.h"

/*
 * Reset a fake port
 *
 * Using a Reset Device IE is too heavyweight as it causes the device
 * to enter the UnConnected state and leave the cluster, this can mean
 * that when the device reconnects it is connected to a different fake
 * port.
 *
 * Instead, reset authenticated devices with a SetAddress(0), followed
 * by a SetAddresss(AuthAddr).
 *
 * For unauthenticated devices just pretend to reset but do nothing.
 * If the device initialization continues to fail it will eventually
 * time out after TrustTimeout and enter the UnConnected state.
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 *
 * Supposedly we are the only thread accesing @wusbhc->port; in any
 * case, maybe we should move the mutex locking from
 * wusbhc_devconnect_auth() to here.
 *
 * @port_idx refers to the wusbhc's port index, not the USB port number
 */
static int wusbhc_rh_port_reset(struct wusbhc *wusbhc, u8 port_idx)
{
	int result = 0;
	struct wusb_port *port = wusb_port_by_idx(wusbhc, port_idx);
	struct wusb_dev *wusb_dev = port->wusb_dev;

	if (wusb_dev == NULL)
		return -ENOTCONN;

	port->status |= USB_PORT_STAT_RESET;
	port->change |= USB_PORT_STAT_C_RESET;

	if (wusb_dev->addr & WUSB_DEV_ADDR_UNAUTH)
		result = 0;
	else
		result = wusb_dev_update_address(wusbhc, wusb_dev);

	port->status &= ~USB_PORT_STAT_RESET;
	port->status |= USB_PORT_STAT_ENABLE;
	port->change |= USB_PORT_STAT_C_RESET | USB_PORT_STAT_C_ENABLE;	

	return result;
}

/*
 * Return the hub change status bitmap
 *
 * The bits in the change status bitmap are cleared when a
 * ClearPortFeature request is issued (USB2.0[11.12.3,11.12.4].
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 *
 * WARNING!! This gets called from atomic context; we cannot get the
 *           mutex--the only race condition we can find is some bit
 *           changing just after we copy it, which shouldn't be too
 *           big of a problem [and we can't make it an spinlock
 *           because other parts need to take it and sleep] .
 *
 *           @usb_hcd is refcounted, so it won't dissapear under us
 *           and before killing a host, the polling of the root hub
 *           would be stopped anyway.
 */
int wusbhc_rh_status_data(struct usb_hcd *usb_hcd, char *_buf)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	size_t cnt, size;
	unsigned long *buf = (unsigned long *) _buf;

	/* WE DON'T LOCK, see comment */
	size = wusbhc->ports_max + 1 /* hub bit */;
	size = (size + 8 - 1) / 8;	/* round to bytes */
	for (cnt = 0; cnt < wusbhc->ports_max; cnt++)
		if (wusb_port_by_idx(wusbhc, cnt)->change)
			set_bit(cnt + 1, buf);
		else
			clear_bit(cnt + 1, buf);
	return size;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_status_data);

/*
 * Return the hub's descriptor
 *
 * NOTE: almost cut and paste from ehci-hub.c
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked
 */
static int wusbhc_rh_get_hub_descr(struct wusbhc *wusbhc, u16 wValue,
				   u16 wIndex,
				   struct usb_hub_descriptor *descr,
				   u16 wLength)
{
	u16 temp = 1 + (wusbhc->ports_max / 8);
	u8 length = 7 + 2 * temp;

	if (wLength < length)
		return -ENOSPC;
	descr->bDescLength = 7 + 2 * temp;
	descr->bDescriptorType = 0x29;	/* HUB type */
	descr->bNbrPorts = wusbhc->ports_max;
	descr->wHubCharacteristics = cpu_to_le16(
		0x00			/* All ports power at once */
		| 0x00			/* not part of compound device */
		| 0x10			/* No overcurrent protection */
		| 0x00			/* 8 FS think time FIXME ?? */
		| 0x00);		/* No port indicators */
	descr->bPwrOn2PwrGood = 0;
	descr->bHubContrCurrent = 0;
	/* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
	memset(&descr->u.hs.DeviceRemovable[0], 0, temp);
	memset(&descr->u.hs.DeviceRemovable[temp], 0xff, temp);
	return 0;
}

/*
 * Clear a hub feature
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 *
 * Nothing to do, so no locking needed ;)
 */
static int wusbhc_rh_clear_hub_feat(struct wusbhc *wusbhc, u16 feature)
{
	int result;

	switch (feature) {
	case C_HUB_LOCAL_POWER:
		/* FIXME: maybe plug bit 0 to the power input status,
		 * if any?
		 * see wusbhc_rh_get_hub_status() */
	case C_HUB_OVER_CURRENT:
		result = 0;
		break;
	default:
		result = -EPIPE;
	}
	return result;
}

/*
 * Return hub status (it is always zero...)
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 *
 * Nothing to do, so no locking needed ;)
 */
static int wusbhc_rh_get_hub_status(struct wusbhc *wusbhc, u32 *buf,
				    u16 wLength)
{
	/* FIXME: maybe plug bit 0 to the power input status (if any)? */
	*buf = 0;
	return 0;
}

/*
 * Set a port feature
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 */
static int wusbhc_rh_set_port_feat(struct wusbhc *wusbhc, u16 feature,
				   u8 selector, u8 port_idx)
{
	struct device *dev = wusbhc->dev;

	if (port_idx > wusbhc->ports_max)
		return -EINVAL;

	switch (feature) {
		/* According to USB2.0[11.24.2.13]p2, these features
		 * are not required to be implemented. */
	case USB_PORT_FEAT_C_OVER_CURRENT:
	case USB_PORT_FEAT_C_ENABLE:
	case USB_PORT_FEAT_C_SUSPEND:
	case USB_PORT_FEAT_C_CONNECTION:
	case USB_PORT_FEAT_C_RESET:
		return 0;
	case USB_PORT_FEAT_POWER:
		/* No such thing, but we fake it works */
		mutex_lock(&wusbhc->mutex);
		wusb_port_by_idx(wusbhc, port_idx)->status |= USB_PORT_STAT_POWER;
		mutex_unlock(&wusbhc->mutex);
		return 0;
	case USB_PORT_FEAT_RESET:
		return wusbhc_rh_port_reset(wusbhc, port_idx);
	case USB_PORT_FEAT_ENABLE:
	case USB_PORT_FEAT_SUSPEND:
		dev_err(dev, "(port_idx %d) set feat %d/%d UNIMPLEMENTED\n",
			port_idx, feature, selector);
		return -ENOSYS;
	default:
		dev_err(dev, "(port_idx %d) set feat %d/%d UNKNOWN\n",
			port_idx, feature, selector);
		return -EPIPE;
	}

	return 0;
}

/*
 * Clear a port feature...
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 */
static int wusbhc_rh_clear_port_feat(struct wusbhc *wusbhc, u16 feature,
				     u8 selector, u8 port_idx)
{
	int result = 0;
	struct device *dev = wusbhc->dev;

	if (port_idx > wusbhc->ports_max)
		return -EINVAL;

	mutex_lock(&wusbhc->mutex);
	switch (feature) {
	case USB_PORT_FEAT_POWER:	/* fake port always on */
		/* According to USB2.0[11.24.2.7.1.4], no need to implement? */
	case USB_PORT_FEAT_C_OVER_CURRENT:
		break;
	case USB_PORT_FEAT_C_RESET:
		wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_RESET;
		break;
	case USB_PORT_FEAT_C_CONNECTION:
		wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_CONNECTION;
		break;
	case USB_PORT_FEAT_ENABLE:
		__wusbhc_dev_disable(wusbhc, port_idx);
		break;
	case USB_PORT_FEAT_C_ENABLE:
		wusb_port_by_idx(wusbhc, port_idx)->change &= ~USB_PORT_STAT_C_ENABLE;
		break;
	case USB_PORT_FEAT_SUSPEND:
	case USB_PORT_FEAT_C_SUSPEND:
		dev_err(dev, "(port_idx %d) Clear feat %d/%d UNIMPLEMENTED\n",
			port_idx, feature, selector);
		result = -ENOSYS;
		break;
	default:
		dev_err(dev, "(port_idx %d) Clear feat %d/%d UNKNOWN\n",
			port_idx, feature, selector);
		result = -EPIPE;
		break;
	}
	mutex_unlock(&wusbhc->mutex);

	return result;
}

/*
 * Return the port's status
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 */
static int wusbhc_rh_get_port_status(struct wusbhc *wusbhc, u16 port_idx,
				     u32 *_buf, u16 wLength)
{
	__le16 *buf = (__le16 *)_buf;

	if (port_idx > wusbhc->ports_max)
		return -EINVAL;

	mutex_lock(&wusbhc->mutex);
	buf[0] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->status);
	buf[1] = cpu_to_le16(wusb_port_by_idx(wusbhc, port_idx)->change);
	mutex_unlock(&wusbhc->mutex);

	return 0;
}

/*
 * Entry point for Root Hub operations
 *
 * @wusbhc is assumed referenced and @wusbhc->mutex unlocked.
 */
int wusbhc_rh_control(struct usb_hcd *usb_hcd, u16 reqntype, u16 wValue,
		      u16 wIndex, char *buf, u16 wLength)
{
	int result = -ENOSYS;
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);

	switch (reqntype) {
	case GetHubDescriptor:
		result = wusbhc_rh_get_hub_descr(
			wusbhc, wValue, wIndex,
			(struct usb_hub_descriptor *) buf, wLength);
		break;
	case ClearHubFeature:
		result = wusbhc_rh_clear_hub_feat(wusbhc, wValue);
		break;
	case GetHubStatus:
		result = wusbhc_rh_get_hub_status(wusbhc, (u32 *)buf, wLength);
		break;

	case SetPortFeature:
		result = wusbhc_rh_set_port_feat(wusbhc, wValue, wIndex >> 8,
						 (wIndex & 0xff) - 1);
		break;
	case ClearPortFeature:
		result = wusbhc_rh_clear_port_feat(wusbhc, wValue, wIndex >> 8,
						   (wIndex & 0xff) - 1);
		break;
	case GetPortStatus:
		result = wusbhc_rh_get_port_status(wusbhc, wIndex - 1,
						   (u32 *)buf, wLength);
		break;

	case SetHubFeature:
	default:
		dev_err(wusbhc->dev, "%s (%p [%p], %x, %x, %x, %p, %x) "
			"UNIMPLEMENTED\n", __func__, usb_hcd, wusbhc, reqntype,
			wValue, wIndex, buf, wLength);
		/* dump_stack(); */
		result = -ENOSYS;
	}
	return result;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_control);

int wusbhc_rh_suspend(struct usb_hcd *usb_hcd)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
		usb_hcd, wusbhc);
	/* dump_stack(); */
	return -ENOSYS;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_suspend);

int wusbhc_rh_resume(struct usb_hcd *usb_hcd)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	dev_err(wusbhc->dev, "%s (%p [%p]) UNIMPLEMENTED\n", __func__,
		usb_hcd, wusbhc);
	/* dump_stack(); */
	return -ENOSYS;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_resume);

int wusbhc_rh_start_port_reset(struct usb_hcd *usb_hcd, unsigned port_idx)
{
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
	dev_err(wusbhc->dev, "%s (%p [%p], port_idx %u) UNIMPLEMENTED\n",
		__func__, usb_hcd, wusbhc, port_idx);
	WARN_ON(1);
	return -ENOSYS;
}
EXPORT_SYMBOL_GPL(wusbhc_rh_start_port_reset);

static void wusb_port_init(struct wusb_port *port)
{
	port->status |= USB_PORT_STAT_HIGH_SPEED;
}

/*
 * Alloc fake port specific fields and status.
 */
int wusbhc_rh_create(struct wusbhc *wusbhc)
{
	int result = -ENOMEM;
	size_t port_size, itr;
	port_size = wusbhc->ports_max * sizeof(wusbhc->port[0]);
	wusbhc->port = kzalloc(port_size, GFP_KERNEL);
	if (wusbhc->port == NULL)
		goto error_port_alloc;
	for (itr = 0; itr < wusbhc->ports_max; itr++)
		wusb_port_init(&wusbhc->port[itr]);
	result = 0;
error_port_alloc:
	return result;
}

void wusbhc_rh_destroy(struct wusbhc *wusbhc)
{
	kfree(wusbhc->port);
}