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
|
/* libusb-win32, Generic Windows USB Library
* Copyright (c) 2002-2005 Stephan Meyer <ste_meyer@web.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "libusb_driver.h"
static NTSTATUS DDKAPI
on_power_state_complete(DEVICE_OBJECT *device_object,
IRP *irp,
void *context);
static NTSTATUS DDKAPI
on_filter_power_state_complete(DEVICE_OBJECT *device_object,
IRP *irp,
void *context);
static void DDKAPI
on_power_set_device_state_complete(DEVICE_OBJECT *device_object,
UCHAR minor_function,
POWER_STATE power_state,
void *context,
IO_STATUS_BLOCK *io_status);
/* [trobinso MOD 4/16/2010]
* If running as a filter, do not act as power policy owner.
*/
NTSTATUS dispatch_power(libusb_device_t *dev, IRP *irp)
{
IO_STACK_LOCATION *stack_location = IoGetCurrentIrpStackLocation(irp);
POWER_STATE power_state;
NTSTATUS status;
status = remove_lock_acquire(dev);
if (!NT_SUCCESS(status))
{
irp->IoStatus.Status = status;
PoStartNextPowerIrp(irp);
IoCompleteRequest(irp, IO_NO_INCREMENT);
return status;
}
if (stack_location->MinorFunction == IRP_MN_SET_POWER)
{
power_state = stack_location->Parameters.Power.State;
if (stack_location->Parameters.Power.Type == SystemPowerState)
{
USBMSG("IRP_MN_SET_POWER: S%d %s\n",
power_state.SystemState - PowerSystemWorking, dev->device_id);
}
else
{
USBMSG("IRP_MN_SET_POWER: D%d %s\n",
power_state.DeviceState - PowerDeviceD0, dev->device_id);
if (power_state.DeviceState > dev->power_state.DeviceState)
{
/* device is powered down, report device state to the */
/* Power Manager before sending the IRP down */
/* (power up is handled by the completion routine) */
PoSetPowerState(dev->self, DevicePowerState, power_state);
}
}
/* TODO: should PoStartNextPowerIrp() be called here or from the */
/* completion routine? */
PoStartNextPowerIrp(irp);
IoCopyCurrentIrpStackLocationToNext(irp);
if (!dev->is_filter && !dev->disallow_power_control)
{
IoSetCompletionRoutine(irp,
on_power_state_complete,
dev,
TRUE, /* on success */
TRUE, /* on error */
TRUE);/* on cancel */
}
else
{
IoSetCompletionRoutine(irp,
on_filter_power_state_complete,
dev,
TRUE, /* on success */
TRUE, /* on error */
TRUE);/* on cancel */
}
return PoCallDriver(dev->next_stack_device, irp);
}
else
{
/* pass all other power IRPs down without setting a completion routine */
PoStartNextPowerIrp(irp);
IoSkipCurrentIrpStackLocation(irp);
status = PoCallDriver(dev->next_stack_device, irp);
remove_lock_release(dev);
return status;
}
}
static NTSTATUS DDKAPI
on_power_state_complete(DEVICE_OBJECT *device_object,
IRP *irp,
void *context)
{
libusb_device_t *dev = context;
IO_STACK_LOCATION *stack_location = IoGetCurrentIrpStackLocation(irp);
POWER_STATE power_state = stack_location->Parameters.Power.State;
DEVICE_POWER_STATE dev_power_state;
if (irp->PendingReturned)
{
IoMarkIrpPending(irp);
}
if (NT_SUCCESS(irp->IoStatus.Status))
{
if (stack_location->Parameters.Power.Type == SystemPowerState)
{
USBMSG("S%d %s\n",
power_state.SystemState - PowerSystemWorking, dev->device_id);
/* save current system state */
dev->power_state.SystemState = power_state.SystemState;
/* get supported device power state from the array reported by */
/* IRP_MN_QUERY_CAPABILITIES */
dev_power_state = dev->device_power_states[power_state.SystemState];
/* set the device power state, but don't block the thread */
power_set_device_state(dev, dev_power_state, FALSE);
}
else /* DevicePowerState */
{
USBMSG("D%d %s\n",
power_state.DeviceState - PowerDeviceD0, dev->device_id);
if (power_state.DeviceState <= dev->power_state.DeviceState)
{
/* device is powered up, */
/* report device state to Power Manager */
PoSetPowerState(dev->self, DevicePowerState, power_state);
}
/* save current device state */
dev->power_state.DeviceState = power_state.DeviceState;
}
}
else
{
USBMSG0("failed\n");
}
remove_lock_release(dev);
return STATUS_SUCCESS;
}
static NTSTATUS DDKAPI
on_filter_power_state_complete(DEVICE_OBJECT *device_object,
IRP *irp,
void *context)
{
libusb_device_t *dev = context;
IO_STACK_LOCATION *stack_location = IoGetCurrentIrpStackLocation(irp);
POWER_STATE power_state = stack_location->Parameters.Power.State;
if (NT_SUCCESS(irp->IoStatus.Status))
{
if (stack_location->Parameters.Power.Type == SystemPowerState)
{
USBMSG("S%d\n",
power_state.SystemState - PowerSystemWorking);
/* save current system state */
dev->power_state.SystemState = power_state.SystemState;
}
else /* DevicePowerState */
{
USBMSG("D%d\n",
power_state.DeviceState - PowerDeviceD0);
if (power_state.DeviceState <= dev->power_state.DeviceState)
{
/* device is powered up, */
/* report device state to Power Manager */
PoSetPowerState(dev->self, DevicePowerState, power_state);
}
/* save current device state */
dev->power_state.DeviceState = power_state.DeviceState;
}
}
else
{
USBMSG0("failed\n");
}
remove_lock_release(dev);
return STATUS_SUCCESS;
}
static void DDKAPI
on_power_set_device_state_complete(DEVICE_OBJECT *device_object,
UCHAR minor_function,
POWER_STATE power_state,
void *context,
IO_STATUS_BLOCK *io_status)
{
KeSetEvent((KEVENT *)context, EVENT_INCREMENT, FALSE);
}
void power_set_device_state(libusb_device_t *dev,
DEVICE_POWER_STATE device_state, bool_t block)
{
NTSTATUS status;
KEVENT event;
POWER_STATE power_state;
power_state.DeviceState = device_state;
USBMSG("setting device power state to D%d %s\n",
power_state.DeviceState - PowerDeviceD0, dev->device_id);
if (block) /* wait for IRP to complete */
{
KeInitializeEvent(&event, NotificationEvent, FALSE);
/* set the device power state and wait for completion */
status = PoRequestPowerIrp(dev->physical_device_object,
IRP_MN_SET_POWER,
power_state,
on_power_set_device_state_complete,
&event, NULL);
if (status == STATUS_PENDING)
{
KeWaitForSingleObject(&event, Executive, KernelMode, FALSE, NULL);
}
}
else
{
PoRequestPowerIrp(dev->physical_device_object, IRP_MN_SET_POWER,
power_state, NULL, NULL, NULL);
}
}
|
