Merge branch 'for-6.3/hid-core' into for-linus

- constify hid_ll_driver (Thomas Weißschuh)
- map standard Battery System Charging to upower (José Expósito)
- couple of assorted fixes and new handling of HID usages (Jingyuan
  Liang & Ronald Tschalär)

21 files changed, 157 insertions, 56 deletions

diff --git a/drivers/hid/.kunitconfig b/drivers/hid/.kunitconfig
index 04daeff5c970..675a8209c7ae 100644
--- a/drivers/hid/.kunitconfig
+++ b/drivers/hid/.kunitconfig
@@ -1,5 +1,6 @@
 CONFIG_KUNIT=y
 CONFIG_USB=y
 CONFIG_USB_HID=y
+CONFIG_HID_BATTERY_STRENGTH=y
 CONFIG_HID_UCLOGIC=y
 CONFIG_HID_KUNIT_TEST=y
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index e2a5d30c8895..d253b3ff2e0c 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -1264,6 +1264,7 @@ config HID_MCP2221
 config HID_KUNIT_TEST
 	tristate "KUnit tests for HID" if !KUNIT_ALL_TESTS
 	depends on KUNIT=y
+	depends on HID_BATTERY_STRENGTH
 	depends on HID_UCLOGIC
 	default KUNIT_ALL_TESTS
 	help
diff --git a/drivers/hid/amd-sfh-hid/amd_sfh_hid.c b/drivers/hid/amd-sfh-hid/amd_sfh_hid.c
index 1b18291fc5af..705b52337068 100644
--- a/drivers/hid/amd-sfh-hid/amd_sfh_hid.c
+++ b/drivers/hid/amd-sfh-hid/amd_sfh_hid.c
@@ -112,7 +112,7 @@ void amdtp_hid_wakeup(struct hid_device *hid)
 	}
 }
 
-static struct hid_ll_driver amdtp_hid_ll_driver = {
+static const struct hid_ll_driver amdtp_hid_ll_driver = {
 	.parse	=	amdtp_hid_parse,
 	.start	=	amdtp_hid_start,
 	.stop	=	amdtp_hid_stop,
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 5c72aef3d3dd..53e4d5831caf 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -41,11 +41,6 @@
 
 #define DRIVER_DESC "HID core driver"
 
-int hid_debug = 0;
-module_param_named(debug, hid_debug, int, 0600);
-MODULE_PARM_DESC(debug, "toggle HID debugging messages");
-EXPORT_SYMBOL_GPL(hid_debug);
-
 static int hid_ignore_special_drivers = 0;
 module_param_named(ignore_special_drivers, hid_ignore_special_drivers, int, 0600);
 MODULE_PARM_DESC(ignore_special_drivers, "Ignore any special drivers and handle all devices by generic driver");
@@ -804,7 +799,8 @@ 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 &&
@@ -2912,10 +2908,6 @@ static int __init hid_init(void)
 {
 	int ret;
 
-	if (hid_debug)
-		pr_warn("hid_debug is now used solely for parser and driver debugging.\n"
-			"debugfs is now used for inspecting the device (report descriptor, reports)\n");
-
 	ret = bus_register(&hid_bus_type);
 	if (ret) {
 		pr_err("can't register hid bus\n");
diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
index e213bdde543a..e7ef1ea107c9 100644
--- a/drivers/hid/hid-debug.c
+++ b/drivers/hid/hid-debug.c
@@ -975,6 +975,7 @@ static const char *keys[KEY_MAX + 1] = {
 	[KEY_CAMERA_ACCESS_DISABLE] = "CameraAccessDisable",
 	[KEY_CAMERA_ACCESS_TOGGLE] = "CameraAccessToggle",
 	[KEY_DICTATE] = "Dictate",
+	[KEY_MICMUTE] = "MicrophoneMute",
 	[KEY_BRIGHTNESS_MIN] = "BrightnessMin",
 	[KEY_BRIGHTNESS_MAX] = "BrightnessMax",
 	[KEY_BRIGHTNESS_AUTO] = "BrightnessAuto",
diff --git a/drivers/hid/hid-hyperv.c b/drivers/hid/hid-hyperv.c
index cf12f17e6533..819eb38eb5df 100644
--- a/drivers/hid/hid-hyperv.c
+++ b/drivers/hid/hid-hyperv.c
@@ -424,7 +424,7 @@ static int mousevsc_hid_raw_request(struct hid_device *hid,
 	return 0;
 }
 
-static struct hid_ll_driver mousevsc_ll_driver = {
+static const struct hid_ll_driver mousevsc_ll_driver = {
 	.parse = mousevsc_hid_parse,
 	.open = mousevsc_hid_open,
 	.close = mousevsc_hid_close,
diff --git a/drivers/hid/hid-input-test.c b/drivers/hid/hid-input-test.c
new file mode 100644
index 000000000000..77c2d45ac62a
--- /dev/null
+++ b/drivers/hid/hid-input-test.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  HID to Linux Input mapping
+ *
+ *  Copyright (c) 2022 José Expósito <jose.exposito89@gmail.com>
+ */
+
+#include <kunit/test.h>
+
+static void hid_test_input_set_battery_charge_status(struct kunit *test)
+{
+	struct hid_device *dev;
+	bool handled;
+
+	dev = kunit_kzalloc(test, sizeof(*dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
+
+	handled = hidinput_set_battery_charge_status(dev, HID_DG_HEIGHT, 0);
+	KUNIT_EXPECT_FALSE(test, handled);
+	KUNIT_EXPECT_EQ(test, dev->battery_charge_status, POWER_SUPPLY_STATUS_UNKNOWN);
+
+	handled = hidinput_set_battery_charge_status(dev, HID_BAT_CHARGING, 0);
+	KUNIT_EXPECT_TRUE(test, handled);
+	KUNIT_EXPECT_EQ(test, dev->battery_charge_status, POWER_SUPPLY_STATUS_DISCHARGING);
+
+	handled = hidinput_set_battery_charge_status(dev, HID_BAT_CHARGING, 1);
+	KUNIT_EXPECT_TRUE(test, handled);
+	KUNIT_EXPECT_EQ(test, dev->battery_charge_status, POWER_SUPPLY_STATUS_CHARGING);
+}
+
+static void hid_test_input_get_battery_property(struct kunit *test)
+{
+	struct power_supply *psy;
+	struct hid_device *dev;
+	union power_supply_propval val;
+	int ret;
+
+	dev = kunit_kzalloc(test, sizeof(*dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
+	dev->battery_avoid_query = true;
+
+	psy = kunit_kzalloc(test, sizeof(*psy), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, psy);
+	psy->drv_data = dev;
+
+	dev->battery_status = HID_BATTERY_UNKNOWN;
+	dev->battery_charge_status = POWER_SUPPLY_STATUS_CHARGING;
+	ret = hidinput_get_battery_property(psy, POWER_SUPPLY_PROP_STATUS, &val);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+	KUNIT_EXPECT_EQ(test, val.intval, POWER_SUPPLY_STATUS_UNKNOWN);
+
+	dev->battery_status = HID_BATTERY_REPORTED;
+	dev->battery_charge_status = POWER_SUPPLY_STATUS_CHARGING;
+	ret = hidinput_get_battery_property(psy, POWER_SUPPLY_PROP_STATUS, &val);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+	KUNIT_EXPECT_EQ(test, val.intval, POWER_SUPPLY_STATUS_CHARGING);
+
+	dev->battery_status = HID_BATTERY_REPORTED;
+	dev->battery_charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
+	ret = hidinput_get_battery_property(psy, POWER_SUPPLY_PROP_STATUS, &val);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+	KUNIT_EXPECT_EQ(test, val.intval, POWER_SUPPLY_STATUS_DISCHARGING);
+}
+
+static struct kunit_case hid_input_tests[] = {
+	KUNIT_CASE(hid_test_input_set_battery_charge_status),
+	KUNIT_CASE(hid_test_input_get_battery_property),
+	{ }
+};
+
+static struct kunit_suite hid_input_test_suite = {
+	.name = "hid_input",
+	.test_cases = hid_input_tests,
+};
+
+kunit_test_suite(hid_input_test_suite);
+
+MODULE_DESCRIPTION("HID input KUnit tests");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("José Expósito <jose.exposito89@gmail.com>");
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 77c8c49852b5..743e518b9836 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -486,7 +486,7 @@ static int hidinput_get_battery_property(struct power_supply *psy,
 		if (dev->battery_status == HID_BATTERY_UNKNOWN)
 			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 		else
-			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+			val->intval = dev->battery_charge_status;
 		break;
 
 	case POWER_SUPPLY_PROP_SCOPE:
@@ -554,6 +554,7 @@ static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 	dev->battery_max = max;
 	dev->battery_report_type = report_type;
 	dev->battery_report_id = field->report->id;
+	dev->battery_charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
 
 	/*
 	 * Stylus is normally not connected to the device and thus we
@@ -620,6 +621,20 @@ static void hidinput_update_battery(struct hid_device *dev, int value)
 		power_supply_changed(dev->battery);
 	}
 }
+
+static bool hidinput_set_battery_charge_status(struct hid_device *dev,
+					       unsigned int usage, int value)
+{
+	switch (usage) {
+	case HID_BAT_CHARGING:
+		dev->battery_charge_status = value ?
+					     POWER_SUPPLY_STATUS_CHARGING :
+					     POWER_SUPPLY_STATUS_DISCHARGING;
+		return true;
+	}
+
+	return false;
+}
 #else  /* !CONFIG_HID_BATTERY_STRENGTH */
 static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 				  struct hid_field *field, bool is_percentage)
@@ -634,6 +649,12 @@ static void hidinput_cleanup_battery(struct hid_device *dev)
 static void hidinput_update_battery(struct hid_device *dev, int value)
 {
 }
+
+static bool hidinput_set_battery_charge_status(struct hid_device *dev,
+					       unsigned int usage, int value)
+{
+	return false;
+}
 #endif	/* CONFIG_HID_BATTERY_STRENGTH */
 
 static bool hidinput_field_in_collection(struct hid_device *device, struct hid_field *field,
@@ -793,6 +814,14 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 			break;
 		}
 
+		if ((usage->hid & 0xf0) == 0xa0) {	/* SystemControl */
+			switch (usage->hid & 0xf) {
+			case 0x9: map_key_clear(KEY_MICMUTE); break;
+			default: goto ignore;
+			}
+			break;
+		}
+
 		if ((usage->hid & 0xf0) == 0xb0) {	/* SC - Display */
 			switch (usage->hid & 0xf) {
 			case 0x05: map_key_clear(KEY_SWITCHVIDEOMODE); break;
@@ -1223,6 +1252,9 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 			hidinput_setup_battery(device, HID_INPUT_REPORT, field, true);
 			usage->type = EV_PWR;
 			return;
+		case HID_BAT_CHARGING:
+			usage->type = EV_PWR;
+			return;
 		}
 		goto unknown;
 
@@ -1465,7 +1497,11 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
 		return;
 
 	if (usage->type == EV_PWR) {
-		hidinput_update_battery(hid, value);
+		bool handled = hidinput_set_battery_charge_status(hid, usage->hid, value);
+
+		if (!handled)
+			hidinput_update_battery(hid, value);
+
 		return;
 	}
 
@@ -2321,3 +2357,7 @@ void hidinput_disconnect(struct hid_device *hid)
 	cancel_work_sync(&hid->led_work);
 }
 EXPORT_SYMBOL_GPL(hidinput_disconnect);
+
+#ifdef CONFIG_HID_KUNIT_TEST
+#include "hid-input-test.c"
+#endif
diff --git a/drivers/hid/hid-letsketch.c b/drivers/hid/hid-letsketch.c
index 74d17cf518ba..97f047f18136 100644
--- a/drivers/hid/hid-letsketch.c
+++ b/drivers/hid/hid-letsketch.c
@@ -238,7 +238,7 @@ static int letsketch_probe(struct hid_device *hdev, const struct hid_device_id *
 	char buf[256];
 	int i, ret;
 
-	if (!hid_is_using_ll_driver(hdev, &usb_hid_driver))
+	if (!hid_is_usb(hdev))
 		return -ENODEV;
 
 	intf = to_usb_interface(hdev->dev.parent);
diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index c358778e070b..62180414efcc 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -554,7 +554,7 @@ static const u8 hid_reportid_size_map[NUMBER_OF_HID_REPORTS] = {
 
 #define LOGITECH_DJ_INTERFACE_NUMBER 0x02
 
-static struct hid_ll_driver logi_dj_ll_driver;
+static const struct hid_ll_driver logi_dj_ll_driver;
 
 static int logi_dj_recv_query_paired_devices(struct dj_receiver_dev *djrcv_dev);
 static void delayedwork_callback(struct work_struct *work);
@@ -1506,7 +1506,7 @@ static bool logi_dj_ll_may_wakeup(struct hid_device *hid)
 	return hid_hw_may_wakeup(djrcv_dev->hidpp);
 }
 
-static struct hid_ll_driver logi_dj_ll_driver = {
+static const struct hid_ll_driver logi_dj_ll_driver = {
 	.parse = logi_dj_ll_parse,
 	.start = logi_dj_ll_start,
 	.stop = logi_dj_ll_stop,
diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
index 6abd3e2a9094..83237b86c8ff 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]->physical :
+							     report->field[i]->application,
 				report->field[i]->usage[0].collection_index,
 				&hsdev, &priv);
 		if (!callback) {
diff --git a/drivers/hid/hid-steam.c b/drivers/hid/hid-steam.c
index 8ee43cb225fc..29ec8b34741a 100644
--- a/drivers/hid/hid-steam.c
+++ b/drivers/hid/hid-steam.c
@@ -674,7 +674,7 @@ static int steam_client_ll_raw_request(struct hid_device *hdev,
 			report_type, reqtype);
 }
 
-static struct hid_ll_driver steam_client_ll_driver = {
+static const struct hid_ll_driver steam_client_ll_driver = {
 	.parse = steam_client_ll_parse,
 	.start = steam_client_ll_start,
 	.stop = steam_client_ll_stop,
diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index b86b62f97108..af98ac31c8d4 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -842,7 +842,7 @@ static void i2c_hid_close(struct hid_device *hid)
 	clear_bit(I2C_HID_STARTED, &ihid->flags);
 }
 
-struct hid_ll_driver i2c_hid_ll_driver = {
+static const struct hid_ll_driver i2c_hid_ll_driver = {
 	.parse = i2c_hid_parse,
 	.start = i2c_hid_start,
 	.stop = i2c_hid_stop,
@@ -851,7 +851,6 @@ struct hid_ll_driver i2c_hid_ll_driver = {
 	.output_report = i2c_hid_output_report,
 	.raw_request = i2c_hid_raw_request,
 };
-EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 
 static int i2c_hid_init_irq(struct i2c_client *client)
 {
diff --git a/drivers/hid/intel-ish-hid/ishtp-hid.c b/drivers/hid/intel-ish-hid/ishtp-hid.c
index 14c271d7d8a9..00c6f0ebf356 100644
--- a/drivers/hid/intel-ish-hid/ishtp-hid.c
+++ b/drivers/hid/intel-ish-hid/ishtp-hid.c
@@ -183,7 +183,7 @@ void ishtp_hid_wakeup(struct hid_device *hid)
 	wake_up_interruptible(&hid_data->hid_wait);
 }
 
-static struct hid_ll_driver ishtp_hid_ll_driver = {
+static const struct hid_ll_driver ishtp_hid_ll_driver = {
 	.parse = ishtp_hid_parse,
 	.start = ishtp_hid_start,
 	.stop = ishtp_hid_stop,
diff --git a/drivers/hid/surface-hid/surface_hid_core.c b/drivers/hid/surface-hid/surface_hid_core.c
index 87637f813de2..a3e9cceddfac 100644
--- a/drivers/hid/surface-hid/surface_hid_core.c
+++ b/drivers/hid/surface-hid/surface_hid_core.c
@@ -174,7 +174,7 @@ static int surface_hid_raw_request(struct hid_device *hid, unsigned char reportn
 	return -EIO;
 }
 
-static struct hid_ll_driver surface_hid_ll_driver = {
+static const struct hid_ll_driver surface_hid_ll_driver = {
 	.start       = surface_hid_start,
 	.stop        = surface_hid_stop,
 	.open        = surface_hid_open,
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index 2a918aeb0af1..f161c95a1ad2 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -387,7 +387,7 @@ static int uhid_hid_output_report(struct hid_device *hid, __u8 *buf,
 	return uhid_hid_output_raw(hid, buf, count, HID_OUTPUT_REPORT);
 }
 
-struct hid_ll_driver uhid_hid_driver = {
+static const struct hid_ll_driver uhid_hid_driver = {
 	.start = uhid_hid_start,
 	.stop = uhid_hid_stop,
 	.open = uhid_hid_open,
@@ -396,7 +396,6 @@ struct hid_ll_driver uhid_hid_driver = {
 	.raw_request = uhid_hid_raw_request,
 	.output_report = uhid_hid_output_report,
 };
-EXPORT_SYMBOL_GPL(uhid_hid_driver);
 
 #ifdef CONFIG_COMPAT
 
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index be4c731aaa65..257dd73e37bf 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -1318,7 +1318,7 @@ static bool usbhid_may_wakeup(struct hid_device *hid)
 	return device_may_wakeup(&dev->dev);
 }
 
-struct hid_ll_driver usb_hid_driver = {
+static const struct hid_ll_driver usb_hid_driver = {
 	.parse = usbhid_parse,
 	.start = usbhid_start,
 	.stop = usbhid_stop,
@@ -1332,7 +1332,12 @@ struct hid_ll_driver usb_hid_driver = {
 	.idle = usbhid_idle,
 	.may_wakeup = usbhid_may_wakeup,
 };
-EXPORT_SYMBOL_GPL(usb_hid_driver);
+
+bool hid_is_usb(const struct hid_device *hdev)
+{
+	return hdev->ll_driver == &usb_hid_driver;
+}
+EXPORT_SYMBOL_GPL(hid_is_usb);
 
 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
 {
diff --git a/drivers/platform/x86/asus-tf103c-dock.c b/drivers/platform/x86/asus-tf103c-dock.c
index 62310e06282b..aeb1138464df 100644
--- a/drivers/platform/x86/asus-tf103c-dock.c
+++ b/drivers/platform/x86/asus-tf103c-dock.c
@@ -250,7 +250,7 @@ static int tf103c_dock_hid_raw_request(struct hid_device *hid, u8 reportnum,
 	return 0;
 }
 
-static struct hid_ll_driver tf103c_dock_hid_ll_driver = {
+static const struct hid_ll_driver tf103c_dock_hid_ll_driver = {
 	.parse = tf103c_dock_hid_parse,
 	.start = tf103c_dock_hid_start,
 	.stop = tf103c_dock_hid_stop,
@@ -259,7 +259,7 @@ static struct hid_ll_driver tf103c_dock_hid_ll_driver = {
 	.raw_request = tf103c_dock_hid_raw_request,
 };
 
-static int tf103c_dock_toprow_codes[13][2] = {
+static const int tf103c_dock_toprow_codes[13][2] = {
 	/* Normal,            AltGr pressed */
 	{ KEY_POWER,          KEY_F1 },
 	{ KEY_RFKILL,         KEY_F2 },
diff --git a/drivers/staging/greybus/hid.c b/drivers/staging/greybus/hid.c
index adb91286803a..15335c38cb26 100644
--- a/drivers/staging/greybus/hid.c
+++ b/drivers/staging/greybus/hid.c
@@ -381,7 +381,7 @@ static int gb_hid_power(struct hid_device *hid, int lvl)
 }
 
 /* HID structure to pass callbacks */
-static struct hid_ll_driver gb_hid_ll_driver = {
+static const struct hid_ll_driver gb_hid_ll_driver = {
 	.parse = gb_hid_parse,
 	.start = gb_hid_start,
 	.stop = gb_hid_stop,
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 8677ae38599e..6074d2a828fd 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -312,6 +312,7 @@ struct hid_item {
 #define HID_DG_LATENCYMODE	0x000d0060
 
 #define HID_BAT_ABSOLUTESTATEOFCHARGE	0x00850065
+#define HID_BAT_CHARGING		0x00850044
 
 #define HID_VD_ASUS_CUSTOM_MEDIA_KEYS	0xff310076
 
@@ -595,7 +596,7 @@ struct hid_device {							/* device report descriptor */
 	struct device dev;						/* device */
 	struct hid_driver *driver;
 
-	struct hid_ll_driver *ll_driver;
+	const struct hid_ll_driver *ll_driver;
 	struct mutex ll_open_lock;
 	unsigned int ll_open_count;
 
@@ -611,6 +612,7 @@ struct hid_device {							/* device report descriptor */
 	__s32 battery_max;
 	__s32 battery_report_type;
 	__s32 battery_report_id;
+	__s32 battery_charge_status;
 	enum hid_battery_status battery_status;
 	bool battery_avoid_query;
 	ktime_t battery_ratelimit_time;
@@ -853,21 +855,7 @@ struct hid_ll_driver {
 	bool (*may_wakeup)(struct hid_device *hdev);
 };
 
-extern struct hid_ll_driver i2c_hid_ll_driver;
-extern struct hid_ll_driver hidp_hid_driver;
-extern struct hid_ll_driver uhid_hid_driver;
-extern struct hid_ll_driver usb_hid_driver;
-
-static inline bool hid_is_using_ll_driver(struct hid_device *hdev,
-		struct hid_ll_driver *driver)
-{
-	return hdev->ll_driver == driver;
-}
-
-static inline bool hid_is_usb(struct hid_device *hdev)
-{
-	return hid_is_using_ll_driver(hdev, &usb_hid_driver);
-}
+extern bool hid_is_usb(const struct hid_device *hdev);
 
 #define	PM_HINT_FULLON	1<<5
 #define PM_HINT_NORMAL	1<<1
@@ -882,8 +870,6 @@ static inline bool hid_is_usb(struct hid_device *hdev)
 
 /* HID core API */
 
-extern int hid_debug;
-
 extern bool hid_ignore(struct hid_device *);
 extern int hid_add_device(struct hid_device *);
 extern void hid_destroy_device(struct hid_device *);
@@ -1191,11 +1177,7 @@ int hid_pidff_init(struct hid_device *hid);
 #define hid_pidff_init NULL
 #endif
 
-#define dbg_hid(fmt, ...)						\
-do {									\
-	if (hid_debug)							\
-		printk(KERN_DEBUG "%s: " fmt, __FILE__, ##__VA_ARGS__);	\
-} while (0)
+#define dbg_hid(fmt, ...) pr_debug("%s: " fmt, __FILE__, ##__VA_ARGS__)
 
 #define hid_err(hid, fmt, ...)				\
 	dev_err(&(hid)->dev, fmt, ##__VA_ARGS__)
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index cc20e706c639..bed1a7b9205c 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -739,7 +739,7 @@ static void hidp_stop(struct hid_device *hid)
 	hid->claimed = 0;
 }
 
-struct hid_ll_driver hidp_hid_driver = {
+static const struct hid_ll_driver hidp_hid_driver = {
 	.parse = hidp_parse,
 	.start = hidp_start,
 	.stop = hidp_stop,
@@ -748,7 +748,6 @@ struct hid_ll_driver hidp_hid_driver = {
 	.raw_request = hidp_raw_request,
 	.output_report = hidp_output_report,
 };
-EXPORT_SYMBOL_GPL(hidp_hid_driver);
 
 /* This function sets up the hid device. It does not add it
    to the HID system. That is done in hidp_add_connection(). */