3 * Copyright (c) 2012, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 #include <linux/device.h>
20 #include <linux/hid.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/mfd/core.h>
24 #include <linux/list.h>
25 #include <linux/hid-sensor-ids.h>
26 #include <linux/hid-sensor-hub.h>
29 #define HID_SENSOR_HUB_ENUM_QUIRK 0x01
32 * struct sensor_hub_pending - Synchronous read pending information
33 * @status: Pending status true/false.
34 * @ready: Completion synchronization data.
35 * @usage_id: Usage id for physical device, E.g. Gyro usage id.
36 * @attr_usage_id: Usage Id of a field, E.g. X-AXIS for a gyro.
37 * @raw_size: Response size for a read request.
38 * @raw_data: Place holder for received response.
40 struct sensor_hub_pending
{
42 struct completion ready
;
50 * struct sensor_hub_data - Hold a instance data for a HID hub device
51 * @hsdev: Stored hid instance for current hub device.
52 * @mutex: Mutex to serialize synchronous request.
53 * @lock: Spin lock to protect pending request structure.
54 * @pending: Holds information of pending sync read request.
55 * @dyn_callback_list: Holds callback function
56 * @dyn_callback_lock: spin lock to protect callback list
57 * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
58 * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
59 * @ref_cnt: Number of MFD clients have opened this device
61 struct sensor_hub_data
{
64 struct sensor_hub_pending pending
;
65 struct list_head dyn_callback_list
;
66 spinlock_t dyn_callback_lock
;
67 struct mfd_cell
*hid_sensor_hub_client_devs
;
68 int hid_sensor_client_cnt
;
74 * struct hid_sensor_hub_callbacks_list - Stores callback list
76 * @usage_id: usage id for a physical device.
77 * @usage_callback: Stores registered callback functions.
78 * @priv: Private data for a physical device.
80 struct hid_sensor_hub_callbacks_list
{
81 struct list_head list
;
83 struct hid_sensor_hub_device
*hsdev
;
84 struct hid_sensor_hub_callbacks
*usage_callback
;
88 static struct hid_report
*sensor_hub_report(int id
, struct hid_device
*hdev
,
91 struct hid_report
*report
;
93 list_for_each_entry(report
, &hdev
->report_enum
[dir
].report_list
, list
) {
97 hid_warn(hdev
, "No report with id 0x%x found\n", id
);
102 static int sensor_hub_get_physical_device_count(struct hid_device
*hdev
)
107 for (i
= 0; i
< hdev
->maxcollection
; ++i
) {
108 struct hid_collection
*collection
= &hdev
->collection
[i
];
109 if (collection
->type
== HID_COLLECTION_PHYSICAL
)
116 static void sensor_hub_fill_attr_info(
117 struct hid_sensor_hub_attribute_info
*info
,
118 s32 index
, s32 report_id
, struct hid_field
*field
)
121 info
->report_id
= report_id
;
122 info
->units
= field
->unit
;
123 info
->unit_expo
= field
->unit_exponent
;
124 info
->size
= (field
->report_size
* field
->report_count
)/8;
125 info
->logical_minimum
= field
->logical_minimum
;
126 info
->logical_maximum
= field
->logical_maximum
;
129 static struct hid_sensor_hub_callbacks
*sensor_hub_get_callback(
130 struct hid_device
*hdev
,
132 int collection_index
,
133 struct hid_sensor_hub_device
**hsdev
,
136 struct hid_sensor_hub_callbacks_list
*callback
;
137 struct sensor_hub_data
*pdata
= hid_get_drvdata(hdev
);
139 spin_lock(&pdata
->dyn_callback_lock
);
140 list_for_each_entry(callback
, &pdata
->dyn_callback_list
, list
)
141 if (callback
->usage_id
== usage_id
&&
143 callback
->hsdev
->start_collection_index
) &&
145 callback
->hsdev
->end_collection_index
)) {
146 *priv
= callback
->priv
;
147 *hsdev
= callback
->hsdev
;
148 spin_unlock(&pdata
->dyn_callback_lock
);
149 return callback
->usage_callback
;
151 spin_unlock(&pdata
->dyn_callback_lock
);
156 int sensor_hub_register_callback(struct hid_sensor_hub_device
*hsdev
,
158 struct hid_sensor_hub_callbacks
*usage_callback
)
160 struct hid_sensor_hub_callbacks_list
*callback
;
161 struct sensor_hub_data
*pdata
= hid_get_drvdata(hsdev
->hdev
);
163 spin_lock(&pdata
->dyn_callback_lock
);
164 list_for_each_entry(callback
, &pdata
->dyn_callback_list
, list
)
165 if (callback
->usage_id
== usage_id
&&
166 callback
->hsdev
== hsdev
) {
167 spin_unlock(&pdata
->dyn_callback_lock
);
170 callback
= kzalloc(sizeof(*callback
), GFP_ATOMIC
);
172 spin_unlock(&pdata
->dyn_callback_lock
);
175 callback
->hsdev
= hsdev
;
176 callback
->usage_callback
= usage_callback
;
177 callback
->usage_id
= usage_id
;
178 callback
->priv
= NULL
;
179 list_add_tail(&callback
->list
, &pdata
->dyn_callback_list
);
180 spin_unlock(&pdata
->dyn_callback_lock
);
184 EXPORT_SYMBOL_GPL(sensor_hub_register_callback
);
186 int sensor_hub_remove_callback(struct hid_sensor_hub_device
*hsdev
,
189 struct hid_sensor_hub_callbacks_list
*callback
;
190 struct sensor_hub_data
*pdata
= hid_get_drvdata(hsdev
->hdev
);
192 spin_lock(&pdata
->dyn_callback_lock
);
193 list_for_each_entry(callback
, &pdata
->dyn_callback_list
, list
)
194 if (callback
->usage_id
== usage_id
&&
195 callback
->hsdev
== hsdev
) {
196 list_del(&callback
->list
);
200 spin_unlock(&pdata
->dyn_callback_lock
);
204 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback
);
206 int sensor_hub_set_feature(struct hid_sensor_hub_device
*hsdev
, u32 report_id
,
207 u32 field_index
, s32 value
)
209 struct hid_report
*report
;
210 struct sensor_hub_data
*data
= hid_get_drvdata(hsdev
->hdev
);
213 mutex_lock(&data
->mutex
);
214 report
= sensor_hub_report(report_id
, hsdev
->hdev
, HID_FEATURE_REPORT
);
215 if (!report
|| (field_index
>= report
->maxfield
)) {
219 hid_set_field(report
->field
[field_index
], 0, value
);
220 hid_hw_request(hsdev
->hdev
, report
, HID_REQ_SET_REPORT
);
221 hid_hw_wait(hsdev
->hdev
);
224 mutex_unlock(&data
->mutex
);
228 EXPORT_SYMBOL_GPL(sensor_hub_set_feature
);
230 int sensor_hub_get_feature(struct hid_sensor_hub_device
*hsdev
, u32 report_id
,
231 u32 field_index
, s32
*value
)
233 struct hid_report
*report
;
234 struct sensor_hub_data
*data
= hid_get_drvdata(hsdev
->hdev
);
237 mutex_lock(&data
->mutex
);
238 report
= sensor_hub_report(report_id
, hsdev
->hdev
, HID_FEATURE_REPORT
);
239 if (!report
|| (field_index
>= report
->maxfield
) ||
240 report
->field
[field_index
]->report_count
< 1) {
244 hid_hw_request(hsdev
->hdev
, report
, HID_REQ_GET_REPORT
);
245 hid_hw_wait(hsdev
->hdev
);
246 *value
= report
->field
[field_index
]->value
[0];
249 mutex_unlock(&data
->mutex
);
253 EXPORT_SYMBOL_GPL(sensor_hub_get_feature
);
256 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device
*hsdev
,
258 u32 attr_usage_id
, u32 report_id
)
260 struct sensor_hub_data
*data
= hid_get_drvdata(hsdev
->hdev
);
262 struct hid_report
*report
;
265 mutex_lock(&data
->mutex
);
266 memset(&data
->pending
, 0, sizeof(data
->pending
));
267 init_completion(&data
->pending
.ready
);
268 data
->pending
.usage_id
= usage_id
;
269 data
->pending
.attr_usage_id
= attr_usage_id
;
270 data
->pending
.raw_size
= 0;
272 spin_lock_irqsave(&data
->lock
, flags
);
273 data
->pending
.status
= true;
274 spin_unlock_irqrestore(&data
->lock
, flags
);
275 report
= sensor_hub_report(report_id
, hsdev
->hdev
, HID_INPUT_REPORT
);
279 hid_hw_request(hsdev
->hdev
, report
, HID_REQ_GET_REPORT
);
280 wait_for_completion_interruptible_timeout(&data
->pending
.ready
, HZ
*5);
281 switch (data
->pending
.raw_size
) {
283 ret_val
= *(u8
*)data
->pending
.raw_data
;
286 ret_val
= *(u16
*)data
->pending
.raw_data
;
289 ret_val
= *(u32
*)data
->pending
.raw_data
;
294 kfree(data
->pending
.raw_data
);
297 data
->pending
.status
= false;
298 mutex_unlock(&data
->mutex
);
302 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value
);
304 int hid_sensor_get_usage_index(struct hid_sensor_hub_device
*hsdev
,
305 u32 report_id
, int field_index
, u32 usage_id
)
307 struct hid_report
*report
;
308 struct hid_field
*field
;
311 report
= sensor_hub_report(report_id
, hsdev
->hdev
, HID_FEATURE_REPORT
);
312 if (!report
|| (field_index
>= report
->maxfield
))
315 field
= report
->field
[field_index
];
316 for (i
= 0; i
< field
->maxusage
; ++i
) {
317 if (field
->usage
[i
].hid
== usage_id
)
318 return field
->usage
[i
].usage_index
;
324 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index
);
326 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device
*hsdev
,
330 struct hid_sensor_hub_attribute_info
*info
)
334 struct hid_report
*report
;
335 struct hid_field
*field
;
336 struct hid_report_enum
*report_enum
;
337 struct hid_device
*hdev
= hsdev
->hdev
;
339 /* Initialize with defaults */
340 info
->usage_id
= usage_id
;
341 info
->attrib_id
= attr_usage_id
;
342 info
->report_id
= -1;
345 info
->unit_expo
= -1;
347 report_enum
= &hdev
->report_enum
[type
];
348 list_for_each_entry(report
, &report_enum
->report_list
, list
) {
349 for (i
= 0; i
< report
->maxfield
; ++i
) {
350 field
= report
->field
[i
];
351 if (field
->maxusage
) {
352 if (field
->physical
== usage_id
&&
353 (field
->logical
== attr_usage_id
||
354 field
->usage
[0].hid
==
356 (field
->usage
[0].collection_index
>=
357 hsdev
->start_collection_index
) &&
358 (field
->usage
[0].collection_index
<
359 hsdev
->end_collection_index
)) {
361 sensor_hub_fill_attr_info(info
, i
,
374 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info
);
377 static int sensor_hub_suspend(struct hid_device
*hdev
, pm_message_t message
)
379 struct sensor_hub_data
*pdata
= hid_get_drvdata(hdev
);
380 struct hid_sensor_hub_callbacks_list
*callback
;
382 hid_dbg(hdev
, " sensor_hub_suspend\n");
383 spin_lock(&pdata
->dyn_callback_lock
);
384 list_for_each_entry(callback
, &pdata
->dyn_callback_list
, list
) {
385 if (callback
->usage_callback
->suspend
)
386 callback
->usage_callback
->suspend(
387 callback
->hsdev
, callback
->priv
);
389 spin_unlock(&pdata
->dyn_callback_lock
);
394 static int sensor_hub_resume(struct hid_device
*hdev
)
396 struct sensor_hub_data
*pdata
= hid_get_drvdata(hdev
);
397 struct hid_sensor_hub_callbacks_list
*callback
;
399 hid_dbg(hdev
, " sensor_hub_resume\n");
400 spin_lock(&pdata
->dyn_callback_lock
);
401 list_for_each_entry(callback
, &pdata
->dyn_callback_list
, list
) {
402 if (callback
->usage_callback
->resume
)
403 callback
->usage_callback
->resume(
404 callback
->hsdev
, callback
->priv
);
406 spin_unlock(&pdata
->dyn_callback_lock
);
411 static int sensor_hub_reset_resume(struct hid_device
*hdev
)
418 * Handle raw report as sent by device
420 static int sensor_hub_raw_event(struct hid_device
*hdev
,
421 struct hid_report
*report
, u8
*raw_data
, int size
)
426 struct sensor_hub_data
*pdata
= hid_get_drvdata(hdev
);
428 struct hid_sensor_hub_callbacks
*callback
= NULL
;
429 struct hid_collection
*collection
= NULL
;
431 struct hid_sensor_hub_device
*hsdev
= NULL
;
433 hid_dbg(hdev
, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
434 report
->id
, size
, report
->type
);
435 hid_dbg(hdev
, "maxfield:%d\n", report
->maxfield
);
436 if (report
->type
!= HID_INPUT_REPORT
)
440 ptr
++; /* Skip report id */
442 spin_lock_irqsave(&pdata
->lock
, flags
);
444 for (i
= 0; i
< report
->maxfield
; ++i
) {
445 hid_dbg(hdev
, "%d collection_index:%x hid:%x sz:%x\n",
446 i
, report
->field
[i
]->usage
->collection_index
,
447 report
->field
[i
]->usage
->hid
,
448 (report
->field
[i
]->report_size
*
449 report
->field
[i
]->report_count
)/8);
450 sz
= (report
->field
[i
]->report_size
*
451 report
->field
[i
]->report_count
)/8;
452 if (pdata
->pending
.status
&& pdata
->pending
.attr_usage_id
==
453 report
->field
[i
]->usage
->hid
) {
454 hid_dbg(hdev
, "data was pending ...\n");
455 pdata
->pending
.raw_data
= kmemdup(ptr
, sz
, GFP_ATOMIC
);
456 if (pdata
->pending
.raw_data
)
457 pdata
->pending
.raw_size
= sz
;
459 pdata
->pending
.raw_size
= 0;
460 complete(&pdata
->pending
.ready
);
462 collection
= &hdev
->collection
[
463 report
->field
[i
]->usage
->collection_index
];
464 hid_dbg(hdev
, "collection->usage %x\n",
467 callback
= sensor_hub_get_callback(hdev
,
468 report
->field
[i
]->physical
,
469 report
->field
[i
]->usage
[0].collection_index
,
472 if (callback
&& callback
->capture_sample
) {
473 if (report
->field
[i
]->logical
)
474 callback
->capture_sample(hsdev
,
475 report
->field
[i
]->logical
, sz
, ptr
,
478 callback
->capture_sample(hsdev
,
479 report
->field
[i
]->usage
->hid
, sz
, ptr
,
484 if (callback
&& collection
&& callback
->send_event
)
485 callback
->send_event(hsdev
, collection
->usage
,
487 spin_unlock_irqrestore(&pdata
->lock
, flags
);
492 int sensor_hub_device_open(struct hid_sensor_hub_device
*hsdev
)
495 struct sensor_hub_data
*data
= hid_get_drvdata(hsdev
->hdev
);
497 mutex_lock(&data
->mutex
);
498 if (!data
->ref_cnt
) {
499 ret
= hid_hw_open(hsdev
->hdev
);
501 hid_err(hsdev
->hdev
, "failed to open hid device\n");
502 mutex_unlock(&data
->mutex
);
507 mutex_unlock(&data
->mutex
);
511 EXPORT_SYMBOL_GPL(sensor_hub_device_open
);
513 void sensor_hub_device_close(struct hid_sensor_hub_device
*hsdev
)
515 struct sensor_hub_data
*data
= hid_get_drvdata(hsdev
->hdev
);
517 mutex_lock(&data
->mutex
);
520 hid_hw_close(hsdev
->hdev
);
521 mutex_unlock(&data
->mutex
);
523 EXPORT_SYMBOL_GPL(sensor_hub_device_close
);
525 static __u8
*sensor_hub_report_fixup(struct hid_device
*hdev
, __u8
*rdesc
,
529 struct sensor_hub_data
*sd
= hid_get_drvdata(hdev
);
530 unsigned char report_block
[] = {
531 0x0a, 0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
532 unsigned char power_block
[] = {
533 0x0a, 0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
535 if (!(sd
->quirks
& HID_SENSOR_HUB_ENUM_QUIRK
)) {
536 hid_dbg(hdev
, "No Enum quirks\n");
540 /* Looks for power and report state usage id and force to 1 */
541 for (index
= 0; index
< *rsize
; ++index
) {
542 if (((*rsize
- index
) > sizeof(report_block
)) &&
543 !memcmp(&rdesc
[index
], report_block
,
544 sizeof(report_block
))) {
545 rdesc
[index
+ 4] = 0x01;
546 index
+= sizeof(report_block
);
548 if (((*rsize
- index
) > sizeof(power_block
)) &&
549 !memcmp(&rdesc
[index
], power_block
,
550 sizeof(power_block
))) {
551 rdesc
[index
+ 4] = 0x01;
552 index
+= sizeof(power_block
);
559 static int sensor_hub_probe(struct hid_device
*hdev
,
560 const struct hid_device_id
*id
)
563 struct sensor_hub_data
*sd
;
567 struct hid_sensor_hub_device
*hsdev
;
568 struct hid_sensor_hub_device
*last_hsdev
= NULL
;
570 sd
= devm_kzalloc(&hdev
->dev
, sizeof(*sd
), GFP_KERNEL
);
572 hid_err(hdev
, "cannot allocate Sensor data\n");
576 hid_set_drvdata(hdev
, sd
);
577 sd
->quirks
= id
->driver_data
;
579 spin_lock_init(&sd
->lock
);
580 spin_lock_init(&sd
->dyn_callback_lock
);
581 mutex_init(&sd
->mutex
);
582 ret
= hid_parse(hdev
);
584 hid_err(hdev
, "parse failed\n");
587 INIT_LIST_HEAD(&hdev
->inputs
);
589 ret
= hid_hw_start(hdev
, 0);
591 hid_err(hdev
, "hw start failed\n");
594 INIT_LIST_HEAD(&sd
->dyn_callback_list
);
595 sd
->hid_sensor_client_cnt
= 0;
597 dev_cnt
= sensor_hub_get_physical_device_count(hdev
);
598 if (dev_cnt
> HID_MAX_PHY_DEVICES
) {
599 hid_err(hdev
, "Invalid Physical device count\n");
603 sd
->hid_sensor_hub_client_devs
= kzalloc(dev_cnt
*
604 sizeof(struct mfd_cell
),
606 if (sd
->hid_sensor_hub_client_devs
== NULL
) {
607 hid_err(hdev
, "Failed to allocate memory for mfd cells\n");
612 for (i
= 0; i
< hdev
->maxcollection
; ++i
) {
613 struct hid_collection
*collection
= &hdev
->collection
[i
];
615 if (collection
->type
== HID_COLLECTION_PHYSICAL
) {
617 hsdev
= kzalloc(sizeof(*hsdev
), GFP_KERNEL
);
619 hid_err(hdev
, "cannot allocate hid_sensor_hub_device\n");
624 hsdev
->vendor_id
= hdev
->vendor
;
625 hsdev
->product_id
= hdev
->product
;
626 hsdev
->start_collection_index
= i
;
628 last_hsdev
->end_collection_index
= i
;
630 name
= kasprintf(GFP_KERNEL
, "HID-SENSOR-%x",
633 hid_err(hdev
, "Failed MFD device name\n");
637 sd
->hid_sensor_hub_client_devs
[
638 sd
->hid_sensor_client_cnt
].id
=
640 sd
->hid_sensor_hub_client_devs
[
641 sd
->hid_sensor_client_cnt
].name
= name
;
642 sd
->hid_sensor_hub_client_devs
[
643 sd
->hid_sensor_client_cnt
].platform_data
=
645 sd
->hid_sensor_hub_client_devs
[
646 sd
->hid_sensor_client_cnt
].pdata_size
=
648 hid_dbg(hdev
, "Adding %s:%d\n", name
,
649 hsdev
->start_collection_index
);
650 sd
->hid_sensor_client_cnt
++;
654 last_hsdev
->end_collection_index
= i
;
656 ret
= mfd_add_devices(&hdev
->dev
, 0, sd
->hid_sensor_hub_client_devs
,
657 sd
->hid_sensor_client_cnt
, NULL
, 0, NULL
);
664 for (i
= 0; i
< sd
->hid_sensor_client_cnt
; ++i
) {
665 kfree(sd
->hid_sensor_hub_client_devs
[i
].name
);
666 kfree(sd
->hid_sensor_hub_client_devs
[i
].platform_data
);
668 kfree(sd
->hid_sensor_hub_client_devs
);
675 static void sensor_hub_remove(struct hid_device
*hdev
)
677 struct sensor_hub_data
*data
= hid_get_drvdata(hdev
);
681 hid_dbg(hdev
, " hardware removed\n");
684 spin_lock_irqsave(&data
->lock
, flags
);
685 if (data
->pending
.status
)
686 complete(&data
->pending
.ready
);
687 spin_unlock_irqrestore(&data
->lock
, flags
);
688 mfd_remove_devices(&hdev
->dev
);
689 for (i
= 0; i
< data
->hid_sensor_client_cnt
; ++i
) {
690 kfree(data
->hid_sensor_hub_client_devs
[i
].name
);
691 kfree(data
->hid_sensor_hub_client_devs
[i
].platform_data
);
693 kfree(data
->hid_sensor_hub_client_devs
);
694 hid_set_drvdata(hdev
, NULL
);
695 mutex_destroy(&data
->mutex
);
698 static const struct hid_device_id sensor_hub_devices
[] = {
699 { HID_DEVICE(HID_BUS_ANY
, HID_GROUP_SENSOR_HUB
, USB_VENDOR_ID_INTEL_0
,
700 USB_DEVICE_ID_INTEL_HID_SENSOR
),
701 .driver_data
= HID_SENSOR_HUB_ENUM_QUIRK
},
702 { HID_DEVICE(HID_BUS_ANY
, HID_GROUP_SENSOR_HUB
, USB_VENDOR_ID_INTEL_1
,
703 USB_DEVICE_ID_INTEL_HID_SENSOR
),
704 .driver_data
= HID_SENSOR_HUB_ENUM_QUIRK
},
705 { HID_DEVICE(HID_BUS_ANY
, HID_GROUP_SENSOR_HUB
, USB_VENDOR_ID_STM_0
,
706 USB_DEVICE_ID_STM_HID_SENSOR
),
707 .driver_data
= HID_SENSOR_HUB_ENUM_QUIRK
},
708 { HID_DEVICE(HID_BUS_ANY
, HID_GROUP_SENSOR_HUB
, HID_ANY_ID
,
712 MODULE_DEVICE_TABLE(hid
, sensor_hub_devices
);
714 static struct hid_driver sensor_hub_driver
= {
715 .name
= "hid-sensor-hub",
716 .id_table
= sensor_hub_devices
,
717 .probe
= sensor_hub_probe
,
718 .remove
= sensor_hub_remove
,
719 .raw_event
= sensor_hub_raw_event
,
720 .report_fixup
= sensor_hub_report_fixup
,
722 .suspend
= sensor_hub_suspend
,
723 .resume
= sensor_hub_resume
,
724 .reset_resume
= sensor_hub_reset_resume
,
727 module_hid_driver(sensor_hub_driver
);
729 MODULE_DESCRIPTION("HID Sensor Hub driver");
730 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
731 MODULE_LICENSE("GPL");