linux-kernel - [PATCH v2] HID: Recognize sensors with application collections too.

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Message-ID: <EFCEA45A-C6F4-477A-B011-9C9E6E61E488@live.com>
Date:   Tue, 10 Jan 2023 08:57:27 +0000
From:   Aditya Garg <gargaditya08@...e.com>
To:     Jiri Kosina <jikos@...nel.org>,
        "jkosina@...e.cz" <jkosina@...e.cz>,
        "benjamin.tissoires@...hat.com" <benjamin.tissoires@...hat.com>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "srinivas.pandruvada@...ux.intel.com" 
        <srinivas.pandruvada@...ux.intel.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
CC:     "orlandoch.dev@...il.com" <orlandoch.dev@...il.com>,
        "ronald@...ovation.ch" <ronald@...ovation.ch>
Subject: [PATCH v2] HID: Recognize sensors with application collections too.

From: Ronald Tschalär <ronald@...ovation.ch>

According to HUTRR39 logical sensor devices may be nested inside
physical collections or may be specified in multiple top-level
application collections (see page 59, strategies 1 and 2). However,
the current code was only recognizing those with physical collections.

This issue turned up in the T2 MacBook Pro's which define the ALS in
a top-level application collection.

Signed-off-by: Ronald Tschalär <ronald@...ovation.ch>
Signed-off-by: Aditya Garg <gargaditya08@...e.com>
—
V2 :- Add missing signed-off-by
 drivers/hid/hid-core.c       | 3 ++-
 drivers/hid/hid-sensor-hub.c | 6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index b7f5566e338d..8fcd663b10e2 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -804,7 +804,8 @@ static void hid_scan_collection(struct hid_parser *parser, unsigned type)
 	int i;
 
 	if (((parser->global.usage_page << 16) == HID_UP_SENSOR) &&
-	    type == HID_COLLECTION_PHYSICAL)
+	    (type == HID_COLLECTION_PHYSICAL ||
+	     type == HID_COLLECTION_APPLICATION))
 		hid->group = HID_GROUP_SENSOR_HUB;
 
 	if (hid->vendor == USB_VENDOR_ID_MICROSOFT &&
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
index 6abd3e2a9094..d03dc4ca095f 100644
--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c
@@ -397,7 +397,8 @@ int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 		for (i = 0; i < report->maxfield; ++i) {
 			field = report->field[i];
 			if (field->maxusage) {
-				if (field->physical == usage_id &&
+				if ((field->physical == usage_id ||
+				     field->application == usage_id) &&
 					(field->logical == attr_usage_id ||
 					field->usage[0].hid ==
 							attr_usage_id) &&
@@ -506,7 +507,8 @@ static int sensor_hub_raw_event(struct hid_device *hdev,
 					collection->usage);
 
 		callback = sensor_hub_get_callback(hdev,
-				report->field[i]->physical,
+				report->field[i]->physical ?:
+					report->field[i]->application,
 				report->field[i]->usage[0].collection_index,
 				&hsdev, &priv);
 		if (!callback) {
-- 
2.38.1