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Subject[PATCH 1/2] HID: autodetect USB HID sensor hubs.
Date
It should not be necessary to add IDs for HID sensor hubs to lists
in hid-core.c and hid-sensor-hub.c. So instead of a whitelist,
autodetect such USB HID sensor hubs, based on a collection of type
physical inside a useage page of type sensor. If some sensor hubs
stil must be usable as raw devices, a blacklist might be created.

Signed-off-by: Alexander Holler <holler@ahsoftware.de>
---
drivers/hid/hid-core.c | 11 ++++++++++-
drivers/hid/hid-sensor-hub.c | 32 +-------------------------------
include/linux/hid-sensor-ids.h | 1 -
include/linux/hid.h | 2 ++
4 files changed, 13 insertions(+), 33 deletions(-)

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index f4109fd..7df5399 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -713,7 +713,12 @@ static int hid_scan_report(struct hid_device *hid)
hid_scan_usage(hid, u);
break;
}
- }
+ } else if (page == HID_UP_SENSOR &&
+ item.type == HID_ITEM_TYPE_MAIN &&
+ item.tag == HID_MAIN_ITEM_TAG_BEGIN_COLLECTION &&
+ (item_udata(&item) & 0xff) == HID_COLLECTION_PHYSICAL &&
+ hid->bus == BUS_USB)
+ hid->group = HID_GROUP_SENSOR_HUB;
}

return 0;
@@ -1465,6 +1470,10 @@ EXPORT_SYMBOL_GPL(hid_disconnect);
* there is a proper autodetection and autoloading in place (based on presence
* of HID_DG_CONTACTID), so those devices don't need to be added to this list,
* as we are doing the right thing in hid_scan_usage().
+ *
+ * Autodetection for (USB) HID sensor hubs exists too. If a collection of type
+ * physical is found inside a usage page of type sensor, hid-sensor-hub will be
+ * used as a driver. See hid_scan_report().
*/
static const struct hid_device_id hid_have_special_driver[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU) },
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
index d9d73e9..ca88ddc 100644
--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c
@@ -82,23 +82,6 @@ struct hid_sensor_hub_callbacks_list {
void *priv;
};

-static int sensor_hub_check_for_sensor_page(struct hid_device *hdev)
-{
- int i;
- int ret = -EINVAL;
-
- for (i = 0; i < hdev->maxcollection; i++) {
- struct hid_collection *col = &hdev->collection[i];
- if (col->type == HID_COLLECTION_PHYSICAL &&
- (col->usage & HID_USAGE_PAGE) == HID_UP_SENSOR) {
- ret = 0;
- break;
- }
- }
-
- return ret;
-}
-
static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
int dir)
{
@@ -524,10 +507,6 @@ static int sensor_hub_probe(struct hid_device *hdev,
hid_err(hdev, "parse failed\n");
goto err_free;
}
- if (sensor_hub_check_for_sensor_page(hdev) < 0) {
- hid_err(hdev, "sensor page not found\n");
- goto err_free;
- }
INIT_LIST_HEAD(&hdev->inputs);

ret = hid_hw_start(hdev, 0);
@@ -630,16 +609,7 @@ static void sensor_hub_remove(struct hid_device *hdev)
}

static const struct hid_device_id sensor_hub_devices[] = {
- { HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8086,
- USB_DEVICE_ID_SENSOR_HUB_1020) },
- { HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8087,
- USB_DEVICE_ID_SENSOR_HUB_1020) },
- { HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8086,
- USB_DEVICE_ID_SENSOR_HUB_09FA) },
- { HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8087,
- USB_DEVICE_ID_SENSOR_HUB_09FA) },
- { HID_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM,
- USB_DEVICE_ID_SENSOR_HUB_7014) },
+ { HID_DEVICE(BUS_USB, HID_GROUP_SENSOR_HUB, HID_ANY_ID, HID_ANY_ID) },
{ }
};
MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
index ca8d7e9..55f2773 100644
--- a/include/linux/hid-sensor-ids.h
+++ b/include/linux/hid-sensor-ids.h
@@ -19,7 +19,6 @@
#ifndef _HID_SENSORS_IDS_H
#define _HID_SENSORS_IDS_H

-#define HID_UP_SENSOR 0x00200000
#define HID_MAX_PHY_DEVICES 0xFF

/* Accel 3D (200073) */
diff --git a/include/linux/hid.h b/include/linux/hid.h
index c076041..c5f6ec2 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -167,6 +167,7 @@ struct hid_item {
#define HID_UP_MSVENDOR 0xff000000
#define HID_UP_CUSTOM 0x00ff0000
#define HID_UP_LOGIVENDOR 0xffbc0000
+#define HID_UP_SENSOR 0x00200000

#define HID_USAGE 0x0000ffff

@@ -292,6 +293,7 @@ struct hid_item {
*/
#define HID_GROUP_GENERIC 0x0001
#define HID_GROUP_MULTITOUCH 0x0002
+#define HID_GROUP_SENSOR_HUB 0x0003

/*
* This is the global environment of the parser. This information is
--
1.7.8.6


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