Merge tag 'for-linus-2022080201' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid

Pull HID updates from Jiri Kosina:

- support for AMD SOCs using SFH1.1 memory access (Basavaraj Natikar)

- XP-PEN Deco L support (José Expósito)

- support for Elan eKTH6915 touchscreens (Douglas Anderson)

- other small assorted fixes and device ID additions

* tag 'for-linus-2022080201' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid: (39 commits)
HID: amd_sfh: Handle condition of "no sensors"
HID: amd_sfh: Fix implicit declaration error on i386
HID: apple: Add "GANSS" to the non-Apple list
HID: alps: Declare U1_UNICORN_LEGACY support
HID: wacom: Force pen out of prox if no events have been received in a while
HID: nintendo: Add missing array termination
HID: lg-g15: Fix comment typo
HID: amd_sfh: Implement SFH1.1 functionality
HID: amd_sfh: Move interrupt handling to common interface
HID: amd_sfh: Move amd_sfh_work to common interface
HID: amd_sfh: Move global functions to static
HID: amd_sfh: Add remove operation in amd_mp2_ops
HID: amd_sfh: Add PM operations in amd_mp2_ops
HID: amd_sfh: Add descriptor operations in amd_mp2_ops
HID: amd_sfh: Move request_list variable to client data
HID: amd_sfh: Move request_list struct to header file
HID: amd_sfh: Move common macros and structures
HID: amd_sfh: Add NULL check for hid device
HID: core: remove unneeded assignment in hid_process_report()
ID: intel-ish-hid: hid-client: drop unexpected word "the" in the comments
...

Documentation/devicetree/bindings/input/elan,ekth6915.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/elan,ekth6915.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Elan eKTH6915 touchscreen controller
+
+maintainers:
+  - Douglas Anderson <[e-mail]>
+
+description:
+  Supports the Elan eKTH6915 touchscreen controller.
+  This touchscreen controller uses the i2c-hid protocol with a reset GPIO.
+
+properties:
+  compatible:
+    items:
+      - const: elan,ekth6915
+
+  reg:
+    const: 0x10
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    description: Reset GPIO; not all touchscreens using eKTH6915 hook this up.
+
+  vcc33-supply:
+    description: The 3.3V supply to the touchscreen.
+
+  vccio-supply:
+    description:
+      The IO supply to the touchscreen. Need not be specified if this is the
+      same as the 3.3V supply.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - vcc33-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      ap_ts: touchscreen@10 {
+        compatible = "elan,ekth6915";
+        reg = <0x10>;
+
+        interrupt-parent = <&tlmm>;
+        interrupts = <9 IRQ_TYPE_LEVEL_LOW>;
+
+        reset-gpios = <&tlmm 8 GPIO_ACTIVE_LOW>;
+        vcc33-supply = <&pp3300_ts>;
+      };
+    };

drivers/hid/.kunitconfig

···
+CONFIG_KUNIT=y
+CONFIG_USB=y
+CONFIG_USB_HID=y
+CONFIG_HID_UCLOGIC=y
+CONFIG_HID_KUNIT_TEST=y

drivers/hid/Kconfig

···
 	To compile this driver as a module, choose M here: the module
 	will be called hid-mcp2221.ko.
 
+config HID_KUNIT_TEST
+	bool "KUnit tests for HID" if !KUNIT_ALL_TESTS
+	depends on KUNIT=y
+	depends on HID_UCLOGIC
+	default KUNIT_ALL_TESTS
+	help
+	  This builds unit tests for HID. This option is not useful for
+	  distributions or general kernels, but only for kernel
+	  developers working on HID and associated drivers.
+
+	  For more information on KUnit and unit tests in general,
+	  please refer to the KUnit documentation in
+	  Documentation/dev-tools/kunit/.
+
+	  If in doubt, say "N".
+
 endmenu
 
 endif # HID

drivers/hid/Makefile

···
 obj-$(CONFIG_HID_SENSOR_HUB)	+= hid-sensor-hub.o
 obj-$(CONFIG_HID_SENSOR_CUSTOM_SENSOR)	+= hid-sensor-custom.o
 
+obj-$(CONFIG_HID_KUNIT_TEST)	+= hid-uclogic-rdesc.o \
+				   hid-uclogic-rdesc-test.o
+
 obj-$(CONFIG_USB_HID)		+= usbhid/
 obj-$(CONFIG_USB_MOUSE)		+= usbhid/
 obj-$(CONFIG_USB_KBD)		+= usbhid/

drivers/hid/amd-sfh-hid/Makefile

···
 amd_sfh-objs += amd_sfh_client.o
 amd_sfh-objs += amd_sfh_pcie.o
 amd_sfh-objs += hid_descriptor/amd_sfh_hid_desc.o
+amd_sfh-objs += sfh1_1/amd_sfh_init.o
+amd_sfh-objs += sfh1_1/amd_sfh_interface.o
+amd_sfh-objs += sfh1_1/amd_sfh_desc.o
 
 ccflags-y += -I $(srctree)/$(src)/

drivers/hid/amd-sfh-hid/amd_sfh_client.c

···
 #include "amd_sfh_pcie.h"
 #include "amd_sfh_hid.h"
 
-
-struct request_list {
-	struct hid_device *hid;
-	struct list_head list;
-	u8 report_id;
-	u8 sensor_idx;
-	u8 report_type;
-	u8 current_index;
-};
-
-static struct request_list req_list;
-
 void amd_sfh_set_report(struct hid_device *hid, int report_id,
 			int report_type)
 {
···
 {
 	struct amdtp_hid_data *hid_data = hid->driver_data;
 	struct amdtp_cl_data *cli_data = hid_data->cli_data;
+	struct request_list *req_list = &cli_data->req_list;
 	int i;
 
 	for (i = 0; i < cli_data->num_hid_devices; i++) {
···
 			new->report_id = report_id;
 			cli_data->report_id[i] = report_id;
 			cli_data->request_done[i] = false;
-			list_add(&new->list, &req_list.list);
+			list_add(&new->list, &req_list->list);
 			break;
 		}
 	}
···
 	return 0;
 }
 
-static void amd_sfh_work(struct work_struct *work)
+void amd_sfh_work(struct work_struct *work)
 {
 	struct amdtp_cl_data *cli_data = container_of(work, struct amdtp_cl_data, work.work);
+	struct request_list *req_list = &cli_data->req_list;
 	struct amd_input_data *in_data = cli_data->in_data;
 	struct request_list *req_node;
 	u8 current_index, sensor_index;
+	struct amd_mp2_ops *mp2_ops;
+	struct amd_mp2_dev *mp2;
 	u8 report_id, node_type;
 	u8 report_size = 0;
 
-	req_node = list_last_entry(&req_list.list, struct request_list, list);
+	req_node = list_last_entry(&req_list->list, struct request_list, list);
 	list_del(&req_node->list);
 	current_index = req_node->current_index;
 	sensor_index = req_node->sensor_idx;
···
 	node_type = req_node->report_type;
 	kfree(req_node);
 
+	mp2 = container_of(in_data, struct amd_mp2_dev, in_data);
+	mp2_ops = mp2->mp2_ops;
 	if (node_type == HID_FEATURE_REPORT) {
-		report_size = get_feature_report(sensor_index, report_id,
-						 cli_data->feature_report[current_index]);
+		report_size = mp2_ops->get_feat_rep(sensor_index, report_id,
+						    cli_data->feature_report[current_index]);
 		if (report_size)
 			hid_input_report(cli_data->hid_sensor_hubs[current_index],
 					 cli_data->report_type[current_index],
···
 			pr_err("AMDSFH: Invalid report size\n");
 
 	} else if (node_type == HID_INPUT_REPORT) {
-		report_size = get_input_report(current_index, sensor_index, report_id, in_data);
+		report_size = mp2_ops->get_in_rep(current_index, sensor_index, report_id, in_data);
 		if (report_size)
 			hid_input_report(cli_data->hid_sensor_hubs[current_index],
 					 cli_data->report_type[current_index],
···
 	amdtp_hid_wakeup(cli_data->hid_sensor_hubs[current_index]);
 }
 
-static void amd_sfh_work_buffer(struct work_struct *work)
+void amd_sfh_work_buffer(struct work_struct *work)
 {
 	struct amdtp_cl_data *cli_data = container_of(work, struct amdtp_cl_data, work_buffer.work);
 	struct amd_input_data *in_data = cli_data->in_data;
+	struct amd_mp2_dev *mp2;
 	u8 report_size;
 	int i;
 
 	for (i = 0; i < cli_data->num_hid_devices; i++) {
 		if (cli_data->sensor_sts[i] == SENSOR_ENABLED) {
-			report_size = get_input_report
-				(i, cli_data->sensor_idx[i], cli_data->report_id[i], in_data);
+			mp2 = container_of(in_data, struct amd_mp2_dev, in_data);
+			report_size = mp2->mp2_ops->get_in_rep(i, cli_data->sensor_idx[i],
+							       cli_data->report_id[i], in_data);
 			hid_input_report(cli_data->hid_sensor_hubs[i], HID_INPUT_REPORT,
 					 in_data->input_report[i], report_size, 0);
 		}
···
 	schedule_delayed_work(&cli_data->work_buffer, msecs_to_jiffies(AMD_SFH_IDLE_LOOP));
 }
 
-u32 amd_sfh_wait_for_response(struct amd_mp2_dev *mp2, u8 sid, u32 sensor_sts)
+static u32 amd_sfh_wait_for_response(struct amd_mp2_dev *mp2, u8 sid, u32 sensor_sts)
 {
 	if (mp2->mp2_ops->response)
 		sensor_sts = mp2->mp2_ops->response(mp2, sid, sensor_sts);
···
 	return sensor_sts;
 }
 
-const char *get_sensor_name(int idx)
+static const char *get_sensor_name(int idx)
 {
 	switch (idx) {
 	case accel_idx:
···
 	}
 }
 
+static void amd_sfh_resume(struct amd_mp2_dev *mp2)
+{
+	struct amdtp_cl_data *cl_data = mp2->cl_data;
+	struct amd_mp2_sensor_info info;
+	int i, status;
+
+	for (i = 0; i < cl_data->num_hid_devices; i++) {
+		if (cl_data->sensor_sts[i] == SENSOR_DISABLED) {
+			info.period = AMD_SFH_IDLE_LOOP;
+			info.sensor_idx = cl_data->sensor_idx[i];
+			info.dma_address = cl_data->sensor_dma_addr[i];
+			mp2->mp2_ops->start(mp2, info);
+			status = amd_sfh_wait_for_response
+					(mp2, cl_data->sensor_idx[i], SENSOR_ENABLED);
+			if (status == SENSOR_ENABLED)
+				cl_data->sensor_sts[i] = SENSOR_ENABLED;
+			dev_dbg(&mp2->pdev->dev, "resume sid 0x%x (%s) status 0x%x\n",
+				cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
+				cl_data->sensor_sts[i]);
+		}
+	}
+
+	schedule_delayed_work(&cl_data->work_buffer, msecs_to_jiffies(AMD_SFH_IDLE_LOOP));
+	amd_sfh_clear_intr(mp2);
+}
+
+static void amd_sfh_suspend(struct amd_mp2_dev *mp2)
+{
+	struct amdtp_cl_data *cl_data = mp2->cl_data;
+	int i, status;
+
+	for (i = 0; i < cl_data->num_hid_devices; i++) {
+		if (cl_data->sensor_idx[i] != HPD_IDX &&
+		    cl_data->sensor_sts[i] == SENSOR_ENABLED) {
+			mp2->mp2_ops->stop(mp2, cl_data->sensor_idx[i]);
+			status = amd_sfh_wait_for_response
+					(mp2, cl_data->sensor_idx[i], SENSOR_DISABLED);
+			if (status != SENSOR_ENABLED)
+				cl_data->sensor_sts[i] = SENSOR_DISABLED;
+			dev_dbg(&mp2->pdev->dev, "suspend sid 0x%x (%s) status 0x%x\n",
+				cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
+				cl_data->sensor_sts[i]);
+		}
+	}
+
+	cancel_delayed_work_sync(&cl_data->work_buffer);
+	amd_sfh_clear_intr(mp2);
+}
+
 int amd_sfh_hid_client_init(struct amd_mp2_dev *privdata)
 {
 	struct amd_input_data *in_data = &privdata->in_data;
 	struct amdtp_cl_data *cl_data = privdata->cl_data;
+	struct amd_mp2_ops *mp2_ops = privdata->mp2_ops;
 	struct amd_mp2_sensor_info info;
+	struct request_list *req_list;
 	struct device *dev;
 	u32 feature_report_size;
 	u32 input_report_size;
 	int rc, i, status;
 	u8 cl_idx;
 
+	req_list = &cl_data->req_list;
 	dev = &privdata->pdev->dev;
+	amd_sfh_set_desc_ops(mp2_ops);
+
+	mp2_ops->suspend = amd_sfh_suspend;
+	mp2_ops->resume = amd_sfh_resume;
 
 	cl_data->num_hid_devices = amd_mp2_get_sensor_num(privdata, &cl_data->sensor_idx[0]);
+	if (cl_data->num_hid_devices == 0)
+		return -ENODEV;
 
 	INIT_DELAYED_WORK(&cl_data->work, amd_sfh_work);
 	INIT_DELAYED_WORK(&cl_data->work_buffer, amd_sfh_work_buffer);
-	INIT_LIST_HEAD(&req_list.list);
+	INIT_LIST_HEAD(&req_list->list);
 	cl_data->in_data = in_data;
 
 	for (i = 0; i < cl_data->num_hid_devices; i++) {
···
 		cl_data->sensor_requested_cnt[i] = 0;
 		cl_data->cur_hid_dev = i;
 		cl_idx = cl_data->sensor_idx[i];
-		cl_data->report_descr_sz[i] = get_descr_sz(cl_idx, descr_size);
+		cl_data->report_descr_sz[i] = mp2_ops->get_desc_sz(cl_idx, descr_size);
 		if (!cl_data->report_descr_sz[i]) {
 			rc = -EINVAL;
 			goto cleanup;
 		}
-		feature_report_size = get_descr_sz(cl_idx, feature_size);
+		feature_report_size = mp2_ops->get_desc_sz(cl_idx, feature_size);
 		if (!feature_report_size) {
 			rc = -EINVAL;
 			goto cleanup;
 		}
-		input_report_size =  get_descr_sz(cl_idx, input_size);
+		input_report_size =  mp2_ops->get_desc_sz(cl_idx, input_size);
 		if (!input_report_size) {
 			rc = -EINVAL;
 			goto cleanup;
···
 			rc = -ENOMEM;
 			goto cleanup;
 		}
-		rc = get_report_descriptor(cl_idx, cl_data->report_descr[i]);
+		rc = mp2_ops->get_rep_desc(cl_idx, cl_data->report_descr[i]);
 		if (rc)
 			return rc;
-		privdata->mp2_ops->start(privdata, info);
+		mp2_ops->start(privdata, info);
 		status = amd_sfh_wait_for_response
 				(privdata, cl_data->sensor_idx[i], SENSOR_ENABLED);
 		if (status == SENSOR_ENABLED) {
 			cl_data->sensor_sts[i] = SENSOR_ENABLED;
 			rc = amdtp_hid_probe(cl_data->cur_hid_dev, cl_data);
 			if (rc) {
-				privdata->mp2_ops->stop(privdata, cl_data->sensor_idx[i]);
+				mp2_ops->stop(privdata, cl_data->sensor_idx[i]);
 				status = amd_sfh_wait_for_response
 					(privdata, cl_data->sensor_idx[i], SENSOR_DISABLED);
 				if (status != SENSOR_ENABLED)
···
 			cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
 			cl_data->sensor_sts[i]);
 	}
-	if (privdata->mp2_ops->discovery_status &&
-	    privdata->mp2_ops->discovery_status(privdata) == 0) {
+	if (mp2_ops->discovery_status && mp2_ops->discovery_status(privdata) == 0) {
 		amd_sfh_hid_client_deinit(privdata);
 		for (i = 0; i < cl_data->num_hid_devices; i++) {
 			devm_kfree(dev, cl_data->feature_report[i]);

drivers/hid/amd-sfh-hid/amd_sfh_common.h

···
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * AMD MP2 common macros and structures
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Basavaraj Natikar <[e-mail]>
+ */
+#ifndef AMD_SFH_COMMON_H
+#define AMD_SFH_COMMON_H
+
+#include <linux/pci.h>
+#include "amd_sfh_hid.h"
+
+#define PCI_DEVICE_ID_AMD_MP2		0x15E4
+#define PCI_DEVICE_ID_AMD_MP2_1_1	0x164A
+
+#define AMD_C2P_MSG(regno) (0x10500 + ((regno) * 4))
+#define AMD_P2C_MSG(regno) (0x10680 + ((regno) * 4))
+
+#define SENSOR_ENABLED			4
+#define SENSOR_DISABLED			5
+
+#define AMD_SFH_IDLE_LOOP		200
+
+enum cmd_id {
+	NO_OP,
+	ENABLE_SENSOR,
+	DISABLE_SENSOR,
+	STOP_ALL_SENSORS = 8,
+};
+
+struct amd_mp2_sensor_info {
+	u8 sensor_idx;
+	u32 period;
+	dma_addr_t dma_address;
+};
+
+struct amd_mp2_dev {
+	struct pci_dev *pdev;
+	struct amdtp_cl_data *cl_data;
+	void __iomem *mmio;
+	void __iomem *vsbase;
+	const struct amd_sfh1_1_ops *sfh1_1_ops;
+	struct amd_mp2_ops *mp2_ops;
+	struct amd_input_data in_data;
+	/* mp2 active control status */
+	u32 mp2_acs;
+};
+
+struct amd_mp2_ops {
+	void (*start)(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info);
+	void (*stop)(struct amd_mp2_dev *privdata, u16 sensor_idx);
+	void (*stop_all)(struct amd_mp2_dev *privdata);
+	int (*response)(struct amd_mp2_dev *mp2, u8 sid, u32 sensor_sts);
+	void (*clear_intr)(struct amd_mp2_dev *privdata);
+	int (*init_intr)(struct amd_mp2_dev *privdata);
+	int (*discovery_status)(struct amd_mp2_dev *privdata);
+	void (*suspend)(struct amd_mp2_dev *mp2);
+	void (*resume)(struct amd_mp2_dev *mp2);
+	void (*remove)(void *privdata);
+	int (*get_rep_desc)(int sensor_idx, u8 rep_desc[]);
+	u32 (*get_desc_sz)(int sensor_idx, int descriptor_name);
+	u8 (*get_feat_rep)(int sensor_idx, int report_id, u8 *feature_report);
+	u8 (*get_in_rep)(u8 current_index, int sensor_idx, int report_id,
+			 struct amd_input_data *in_data);
+};
+
+void amd_sfh_work(struct work_struct *work);
+void amd_sfh_work_buffer(struct work_struct *work);
+void amd_sfh_clear_intr_v2(struct amd_mp2_dev *privdata);
+int amd_sfh_irq_init_v2(struct amd_mp2_dev *privdata);
+void amd_sfh_clear_intr(struct amd_mp2_dev *privdata);
+int amd_sfh_irq_init(struct amd_mp2_dev *privdata);
+#endif

drivers/hid/amd-sfh-hid/amd_sfh_hid.c

···
 
 void amdtp_hid_wakeup(struct hid_device *hid)
 {
-	struct amdtp_hid_data *hid_data = hid->driver_data;
-	struct amdtp_cl_data *cli_data = hid_data->cli_data;
+	struct amdtp_hid_data *hid_data;
+	struct amdtp_cl_data *cli_data;
 
-	cli_data->request_done[cli_data->cur_hid_dev] = true;
-	wake_up_interruptible(&hid_data->hid_wait);
+	if (hid) {
+		hid_data = hid->driver_data;
+		cli_data = hid_data->cli_data;
+		cli_data->request_done[cli_data->cur_hid_dev] = true;
+		wake_up_interruptible(&hid_data->hid_wait);
+	}
 }
 
 static struct hid_ll_driver amdtp_hid_ll_driver = {

drivers/hid/amd-sfh-hid/amd_sfh_hid.h

···
 #define AMD_SFH_HID_VENDOR	0x1022
 #define AMD_SFH_HID_PRODUCT	0x0001
 
+struct request_list {
+	struct hid_device *hid;
+	struct list_head list;
+	u8 report_id;
+	u8 sensor_idx;
+	u8 report_type;
+	u8 current_index;
+};
+
 struct amd_input_data {
 	u32 *sensor_virt_addr[MAX_HID_DEVICES];
 	u8 *input_report[MAX_HID_DEVICES];
···
 	struct amd_input_data *in_data;
 	struct delayed_work work;
 	struct delayed_work work_buffer;
+	struct request_list req_list;
 };
 
 /**
···
 int amd_sfh_get_report(struct hid_device *hid, int report_id, int report_type);
 void amd_sfh_set_report(struct hid_device *hid, int report_id, int report_type);
 void amdtp_hid_wakeup(struct hid_device *hid);
-u8 get_input_report(u8 current_index, int sensor_idx, int report_id,
-		    struct amd_input_data *in_data);
 #endif

drivers/hid/amd-sfh-hid/amd_sfh_pcie.c

···
 #include <linux/slab.h>
 
 #include "amd_sfh_pcie.h"
+#include "sfh1_1/amd_sfh_init.h"
 
 #define DRIVER_NAME	"pcie_mp2_amd"
 #define DRIVER_DESC	"AMD(R) PCIe MP2 Communication Driver"
···
 	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
 }
 
-static void amd_sfh_clear_intr_v2(struct amd_mp2_dev *privdata)
+void amd_sfh_clear_intr_v2(struct amd_mp2_dev *privdata)
 {
 	if (readl(privdata->mmio + AMD_P2C_MSG(4))) {
 		writel(0, privdata->mmio + AMD_P2C_MSG(4));
···
 	}
 }
 
-static void amd_sfh_clear_intr(struct amd_mp2_dev *privdata)
+void amd_sfh_clear_intr(struct amd_mp2_dev *privdata)
 {
 	if (privdata->mp2_ops->clear_intr)
 		privdata->mp2_ops->clear_intr(privdata);
···
 	return IRQ_HANDLED;
 }
 
-static int amd_sfh_irq_init_v2(struct amd_mp2_dev *privdata)
+int amd_sfh_irq_init_v2(struct amd_mp2_dev *privdata)
 {
 	int rc;
 
···
 		      SENSOR_DISCOVERY_STATUS_MASK) >> SENSOR_DISCOVERY_STATUS_SHIFT;
 }
 
-void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
+static void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
 {
 	union sfh_cmd_param cmd_param;
 	union sfh_cmd_base cmd_base;
···
 	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
 }
 
-void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx)
+static void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx)
 {
 	union sfh_cmd_base cmd_base;
 
···
 	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG0);
 }
 
-void amd_stop_all_sensors(struct amd_mp2_dev *privdata)
+static void amd_stop_all_sensors(struct amd_mp2_dev *privdata)
 {
 	union sfh_cmd_base cmd_base;
 
···
 	amd_sfh_clear_intr(mp2);
 }
 
-static const struct amd_mp2_ops amd_sfh_ops_v2 = {
+static struct amd_mp2_ops amd_sfh_ops_v2 = {
 	.start = amd_start_sensor_v2,
 	.stop = amd_stop_sensor_v2,
 	.stop_all = amd_stop_all_sensor_v2,
···
 	.clear_intr = amd_sfh_clear_intr_v2,
 	.init_intr = amd_sfh_irq_init_v2,
 	.discovery_status = amd_sfh_dis_sts_v2,
+	.remove = amd_mp2_pci_remove,
 };
 
-static const struct amd_mp2_ops amd_sfh_ops = {
+static struct amd_mp2_ops amd_sfh_ops = {
 	.start = amd_start_sensor,
 	.stop = amd_stop_sensor,
 	.stop_all = amd_stop_all_sensors,
+	.remove = amd_mp2_pci_remove,
 };
 
 static void mp2_select_ops(struct amd_mp2_dev *privdata)
···
 	}
 }
 
-static int amd_sfh_irq_init(struct amd_mp2_dev *privdata)
+int amd_sfh_irq_init(struct amd_mp2_dev *privdata)
 {
 	if (privdata->mp2_ops->init_intr)
 		return privdata->mp2_ops->init_intr(privdata);
···
 	if (!privdata->cl_data)
 		return -ENOMEM;
 
+	privdata->sfh1_1_ops = (const struct amd_sfh1_1_ops *)id->driver_data;
+	if (privdata->sfh1_1_ops) {
+		rc = privdata->sfh1_1_ops->init(privdata);
+		if (rc)
+			return rc;
+		goto init_done;
+	}
+
 	mp2_select_ops(privdata);
 
 	rc = amd_sfh_irq_init(privdata);
···
 	rc = amd_sfh_hid_client_init(privdata);
 	if (rc) {
 		amd_sfh_clear_intr(privdata);
-		dev_err(&pdev->dev, "amd_sfh_hid_client_init failed\n");
+		if (rc != -EOPNOTSUPP)
+			dev_err(&pdev->dev, "amd_sfh_hid_client_init failed\n");
 		return rc;
 	}
 
+init_done:
 	amd_sfh_clear_intr(privdata);
 
-	return devm_add_action_or_reset(&pdev->dev, amd_mp2_pci_remove, privdata);
+	return devm_add_action_or_reset(&pdev->dev, privdata->mp2_ops->remove, privdata);
 }
 
 static int __maybe_unused amd_mp2_pci_resume(struct device *dev)
 {
 	struct amd_mp2_dev *mp2 = dev_get_drvdata(dev);
-	struct amdtp_cl_data *cl_data = mp2->cl_data;
-	struct amd_mp2_sensor_info info;
-	int i, status;
 
-	for (i = 0; i < cl_data->num_hid_devices; i++) {
-		if (cl_data->sensor_sts[i] == SENSOR_DISABLED) {
-			info.period = AMD_SFH_IDLE_LOOP;
-			info.sensor_idx = cl_data->sensor_idx[i];
-			info.dma_address = cl_data->sensor_dma_addr[i];
-			mp2->mp2_ops->start(mp2, info);
-			status = amd_sfh_wait_for_response
-					(mp2, cl_data->sensor_idx[i], SENSOR_ENABLED);
-			if (status == SENSOR_ENABLED)
-				cl_data->sensor_sts[i] = SENSOR_ENABLED;
-			dev_dbg(dev, "suspend sid 0x%x (%s) status 0x%x\n",
-				cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
-				cl_data->sensor_sts[i]);
-		}
-	}
-
-	schedule_delayed_work(&cl_data->work_buffer, msecs_to_jiffies(AMD_SFH_IDLE_LOOP));
-	amd_sfh_clear_intr(mp2);
+	mp2->mp2_ops->resume(mp2);
 
 	return 0;
 }
···
 static int __maybe_unused amd_mp2_pci_suspend(struct device *dev)
 {
 	struct amd_mp2_dev *mp2 = dev_get_drvdata(dev);
-	struct amdtp_cl_data *cl_data = mp2->cl_data;
-	int i, status;
 
-	for (i = 0; i < cl_data->num_hid_devices; i++) {
-		if (cl_data->sensor_idx[i] != HPD_IDX &&
-		    cl_data->sensor_sts[i] == SENSOR_ENABLED) {
-			mp2->mp2_ops->stop(mp2, cl_data->sensor_idx[i]);
-			status = amd_sfh_wait_for_response
-					(mp2, cl_data->sensor_idx[i], SENSOR_DISABLED);
-			if (status != SENSOR_ENABLED)
-				cl_data->sensor_sts[i] = SENSOR_DISABLED;
-			dev_dbg(dev, "suspend sid 0x%x (%s) status 0x%x\n",
-				cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
-				cl_data->sensor_sts[i]);
-		}
-	}
-
-	cancel_delayed_work_sync(&cl_data->work_buffer);
-	amd_sfh_clear_intr(mp2);
+	mp2->mp2_ops->suspend(mp2);
 
 	return 0;
 }
···
 
 static const struct pci_device_id amd_mp2_pci_tbl[] = {
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_MP2) },
+	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_MP2_1_1),
+	  .driver_data = (kernel_ulong_t)&sfh1_1_ops },
 	{ }
 };
 MODULE_DEVICE_TABLE(pci, amd_mp2_pci_tbl);

drivers/hid/amd-sfh-hid/amd_sfh_pcie.h

···
 #ifndef PCIE_MP2_AMD_H
 #define PCIE_MP2_AMD_H
 
-#include <linux/pci.h>
-#include "amd_sfh_hid.h"
-
-#define PCI_DEVICE_ID_AMD_MP2	0x15E4
-
-#define ENABLE_SENSOR		1
-#define DISABLE_SENSOR		2
-#define STOP_ALL_SENSORS	8
+#include "amd_sfh_common.h"
 
 /* MP2 C2P Message Registers */
 #define AMD_C2P_MSG0	0x10500
 #define AMD_C2P_MSG1	0x10504
 #define AMD_C2P_MSG2	0x10508
 
-#define AMD_C2P_MSG(regno) (0x10500 + ((regno) * 4))
-#define AMD_P2C_MSG(regno) (0x10680 + ((regno) * 4))
-
 /* MP2 P2C Message Registers */
 #define AMD_P2C_MSG3	0x1068C /* Supported Sensors info */
 
 #define V2_STATUS	0x2
 
-#define SENSOR_ENABLED     4
-#define SENSOR_DISABLED    5
-
 #define HPD_IDX		16
-
-#define AMD_SFH_IDLE_LOOP	200
 
 #define SENSOR_DISCOVERY_STATUS_MASK		GENMASK(5, 3)
 #define SENSOR_DISCOVERY_STATUS_SHIFT		3
···
 	als_idx = 19
 };
 
-struct amd_mp2_dev {
-	struct pci_dev *pdev;
-	struct amdtp_cl_data *cl_data;
-	void __iomem *mmio;
-	const struct amd_mp2_ops *mp2_ops;
-	struct amd_input_data in_data;
-	/* mp2 active control status */
-	u32 mp2_acs;
-};
-
-struct amd_mp2_sensor_info {
-	u8 sensor_idx;
-	u32 period;
-	dma_addr_t dma_address;
-};
-
 enum mem_use_type {
 	USE_DRAM,
 	USE_C2P_REG,
···
 	};
 };
 
-void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info);
-void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx);
-void amd_stop_all_sensors(struct amd_mp2_dev *privdata);
 int amd_mp2_get_sensor_num(struct amd_mp2_dev *privdata, u8 *sensor_id);
 int amd_sfh_hid_client_init(struct amd_mp2_dev *privdata);
 int amd_sfh_hid_client_deinit(struct amd_mp2_dev *privdata);
-u32 amd_sfh_wait_for_response(struct amd_mp2_dev *mp2, u8 sid, u32 sensor_sts);
-void amd_mp2_suspend(struct amd_mp2_dev *mp2);
-void amd_mp2_resume(struct amd_mp2_dev *mp2);
-const char *get_sensor_name(int idx);
+void amd_sfh_set_desc_ops(struct amd_mp2_ops *mp2_ops);
 
-struct amd_mp2_ops {
-	 void (*start)(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info);
-	 void (*stop)(struct amd_mp2_dev *privdata, u16 sensor_idx);
-	 void (*stop_all)(struct amd_mp2_dev *privdata);
-	 int (*response)(struct amd_mp2_dev *mp2, u8 sid, u32 sensor_sts);
-	 void (*clear_intr)(struct amd_mp2_dev *privdata);
-	 int (*init_intr)(struct amd_mp2_dev *privdata);
-	 int (*discovery_status)(struct amd_mp2_dev *privdata);
-};
 #endif

drivers/hid/amd-sfh-hid/hid_descriptor/amd_sfh_hid_desc.c

···
 #define HID_USAGE_SENSOR_EVENT_DATA_UPDATED_ENUM                      0x04
 #define ILLUMINANCE_MASK					GENMASK(14, 0)
 
-int get_report_descriptor(int sensor_idx, u8 *rep_desc)
+static int get_report_descriptor(int sensor_idx, u8 *rep_desc)
 {
 	switch (sensor_idx) {
 	case accel_idx: /* accel */
···
 	return 0;
 }
 
-u32 get_descr_sz(int sensor_idx, int descriptor_name)
+static u32 get_descr_sz(int sensor_idx, int descriptor_name)
 {
 	switch (sensor_idx) {
 	case accel_idx:
···
 	common->report_interval =  HID_DEFAULT_REPORT_INTERVAL;
 }
 
-u8 get_feature_report(int sensor_idx, int report_id, u8 *feature_report)
+static u8 get_feature_report(int sensor_idx, int report_id, u8 *feature_report)
 {
 	struct accel3_feature_report acc_feature;
 	struct gyro_feature_report gyro_feature;
···
 	common->event_type = HID_USAGE_SENSOR_EVENT_DATA_UPDATED_ENUM;
 }
 
-u8 get_input_report(u8 current_index, int sensor_idx, int report_id, struct amd_input_data *in_data)
+static u8 get_input_report(u8 current_index, int sensor_idx, int report_id,
+			   struct amd_input_data *in_data)
 {
 	struct amd_mp2_dev *privdata = container_of(in_data, struct amd_mp2_dev, in_data);
 	u32 *sensor_virt_addr = in_data->sensor_virt_addr[current_index];
···
 		break;
 	}
 	return report_size;
+}
+
+void amd_sfh_set_desc_ops(struct amd_mp2_ops *mp2_ops)
+{
+	mp2_ops->get_rep_desc = get_report_descriptor;
+	mp2_ops->get_feat_rep = get_feature_report;
+	mp2_ops->get_in_rep = get_input_report;
+	mp2_ops->get_desc_sz = get_descr_sz;
 }

drivers/hid/amd-sfh-hid/hid_descriptor/amd_sfh_hid_desc.h

···
 	u8 human_presence;
 } __packed;
 
-int get_report_descriptor(int sensor_idx, u8 rep_desc[]);
-u32 get_descr_sz(int sensor_idx, int descriptor_name);
-u8 get_feature_report(int sensor_idx, int report_id, u8 *feature_report);
 #endif

drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_desc.c

···
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AMD MP2 1.1 descriptor interfaces
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Basavaraj Natikar <[e-mail]>
+ */
+
+#include <linux/hid-sensor-ids.h>
+
+#include "amd_sfh_interface.h"
+#include "../hid_descriptor/amd_sfh_hid_desc.h"
+#include "../hid_descriptor/amd_sfh_hid_report_desc.h"
+
+#define SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM			0x41
+#define SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM			0x51
+#define HID_DEFAULT_REPORT_INTERVAL					0x50
+#define HID_DEFAULT_MIN_VALUE						0X7F
+#define HID_DEFAULT_MAX_VALUE						0x80
+#define HID_DEFAULT_SENSITIVITY						0x7F
+#define HID_USAGE_SENSOR_PROPERTY_CONNECTION_TYPE_PC_INTEGRATED_ENUM	0x01
+/* state enums */
+#define HID_USAGE_SENSOR_STATE_READY_ENUM				0x02
+#define HID_USAGE_SENSOR_STATE_INITIALIZING_ENUM			0x05
+#define HID_USAGE_SENSOR_EVENT_DATA_UPDATED_ENUM			0x04
+
+static int get_report_desc(int sensor_idx, u8 *rep_desc)
+{
+	switch (sensor_idx) {
+	case ACCEL_IDX: /* accelerometer */
+		memset(rep_desc, 0, sizeof(accel3_report_descriptor));
+		memcpy(rep_desc, accel3_report_descriptor,
+		       sizeof(accel3_report_descriptor));
+		break;
+	case GYRO_IDX: /* gyroscope */
+		memset(rep_desc, 0, sizeof(gyro3_report_descriptor));
+		memcpy(rep_desc, gyro3_report_descriptor,
+		       sizeof(gyro3_report_descriptor));
+		break;
+	case MAG_IDX: /* magnetometer */
+		memset(rep_desc, 0, sizeof(comp3_report_descriptor));
+		memcpy(rep_desc, comp3_report_descriptor,
+		       sizeof(comp3_report_descriptor));
+		break;
+	case ALS_IDX: /* ambient light sensor */
+		memset(rep_desc, 0, sizeof(als_report_descriptor));
+		memcpy(rep_desc, als_report_descriptor,
+		       sizeof(als_report_descriptor));
+		break;
+	case HPD_IDX: /* HPD sensor */
+		memset(rep_desc, 0, sizeof(hpd_report_descriptor));
+		memcpy(rep_desc, hpd_report_descriptor,
+		       sizeof(hpd_report_descriptor));
+		break;
+	}
+	return 0;
+}
+
+static void get_common_features(struct common_feature_property *common, int report_id)
+{
+	common->report_id = report_id;
+	common->connection_type = HID_USAGE_SENSOR_PROPERTY_CONNECTION_TYPE_PC_INTEGRATED_ENUM;
+	common->report_state = SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM;
+	common->power_state = SENSOR_PROP_POWER_STATE_D0_FULL_POWER_ENUM;
+	common->sensor_state = HID_USAGE_SENSOR_STATE_INITIALIZING_ENUM;
+	common->report_interval =  HID_DEFAULT_REPORT_INTERVAL;
+}
+
+static u8 get_feature_rep(int sensor_idx, int report_id, u8 *feature_report)
+{
+	struct magno_feature_report magno_feature;
+	struct accel3_feature_report acc_feature;
+	struct gyro_feature_report gyro_feature;
+	struct hpd_feature_report hpd_feature;
+	struct als_feature_report als_feature;
+	u8 report_size = 0;
+
+	if (!feature_report)
+		return report_size;
+
+	switch (sensor_idx) {
+	case ACCEL_IDX: /* accelerometer */
+		get_common_features(&acc_feature.common_property, report_id);
+		acc_feature.accel_change_sesnitivity = HID_DEFAULT_SENSITIVITY;
+		acc_feature.accel_sensitivity_min = HID_DEFAULT_MIN_VALUE;
+		acc_feature.accel_sensitivity_max = HID_DEFAULT_MAX_VALUE;
+		memcpy(feature_report, &acc_feature, sizeof(acc_feature));
+		report_size = sizeof(acc_feature);
+		break;
+	case GYRO_IDX: /* gyroscope */
+		get_common_features(&gyro_feature.common_property, report_id);
+		gyro_feature.gyro_change_sesnitivity = HID_DEFAULT_SENSITIVITY;
+		gyro_feature.gyro_sensitivity_min = HID_DEFAULT_MIN_VALUE;
+		gyro_feature.gyro_sensitivity_max = HID_DEFAULT_MAX_VALUE;
+		memcpy(feature_report, &gyro_feature, sizeof(gyro_feature));
+		report_size = sizeof(gyro_feature);
+		break;
+	case MAG_IDX: /* magnetometer */
+		get_common_features(&magno_feature.common_property, report_id);
+		magno_feature.magno_headingchange_sensitivity = HID_DEFAULT_SENSITIVITY;
+		magno_feature.heading_min = HID_DEFAULT_MIN_VALUE;
+		magno_feature.heading_max = HID_DEFAULT_MAX_VALUE;
+		magno_feature.flux_change_sensitivity = HID_DEFAULT_MIN_VALUE;
+		magno_feature.flux_min = HID_DEFAULT_MIN_VALUE;
+		magno_feature.flux_max = HID_DEFAULT_MAX_VALUE;
+		memcpy(feature_report, &magno_feature, sizeof(magno_feature));
+		report_size = sizeof(magno_feature);
+		break;
+	case ALS_IDX:  /* ambient light sensor */
+		get_common_features(&als_feature.common_property, report_id);
+		als_feature.als_change_sesnitivity = HID_DEFAULT_SENSITIVITY;
+		als_feature.als_sensitivity_min = HID_DEFAULT_MIN_VALUE;
+		als_feature.als_sensitivity_max = HID_DEFAULT_MAX_VALUE;
+		memcpy(feature_report, &als_feature, sizeof(als_feature));
+		report_size = sizeof(als_feature);
+		break;
+	case HPD_IDX:  /* human presence detection sensor */
+		get_common_features(&hpd_feature.common_property, report_id);
+		memcpy(feature_report, &hpd_feature, sizeof(hpd_feature));
+		report_size = sizeof(hpd_feature);
+		break;
+	}
+	return report_size;
+}
+
+static void get_common_inputs(struct common_input_property *common, int report_id)
+{
+	common->report_id = report_id;
+	common->sensor_state = HID_USAGE_SENSOR_STATE_READY_ENUM;
+	common->event_type = HID_USAGE_SENSOR_EVENT_DATA_UPDATED_ENUM;
+}
+
+static int float_to_int(u32 float32)
+{
+	int fraction, shift, mantissa, sign, exp, zeropre;
+
+	mantissa = float32 & GENMASK(22, 0);
+	sign = (float32 & BIT(31)) ? -1 : 1;
+	exp = (float32 & ~BIT(31)) >> 23;
+
+	if (!exp && !mantissa)
+		return 0;
+
+	exp -= 127;
+	if (exp < 0) {
+		exp = -exp;
+		zeropre = (((BIT(23) + mantissa) * 100) >> 23) >> exp;
+		return zeropre >= 50 ? sign : 0;
+	}
+
+	shift = 23 - exp;
+	float32 = BIT(exp) + (mantissa >> shift);
+	fraction = mantissa & GENMASK(shift - 1, 0);
+
+	return (((fraction * 100) >> shift) >= 50) ? sign * (float32 + 1) : sign * float32;
+}
+
+static u8 get_input_rep(u8 current_index, int sensor_idx, int report_id,
+			struct amd_input_data *in_data)
+{
+	struct amd_mp2_dev *mp2 = container_of(in_data, struct amd_mp2_dev, in_data);
+	u8 *input_report = in_data->input_report[current_index];
+	struct magno_input_report magno_input;
+	struct accel3_input_report acc_input;
+	struct gyro_input_report gyro_input;
+	struct als_input_report als_input;
+	struct hpd_input_report hpd_input;
+	struct sfh_accel_data accel_data;
+	struct sfh_gyro_data gyro_data;
+	struct sfh_mag_data mag_data;
+	struct sfh_als_data als_data;
+	struct hpd_status hpdstatus;
+	void __iomem *sensoraddr;
+	u8 report_size = 0;
+
+	if (!input_report)
+		return report_size;
+
+	switch (sensor_idx) {
+	case ACCEL_IDX: /* accelerometer */
+		sensoraddr = mp2->vsbase + (ACCEL_IDX * SENSOR_DATA_MEM_SIZE_DEFAULT) +
+			     OFFSET_SENSOR_DATA_DEFAULT;
+		memcpy_fromio(&accel_data, sensoraddr, sizeof(struct sfh_accel_data));
+		get_common_inputs(&acc_input.common_property, report_id);
+		acc_input.in_accel_x_value = float_to_int(accel_data.acceldata.x) / 100;
+		acc_input.in_accel_y_value = float_to_int(accel_data.acceldata.y) / 100;
+		acc_input.in_accel_z_value = float_to_int(accel_data.acceldata.z) / 100;
+		memcpy(input_report, &acc_input, sizeof(acc_input));
+		report_size = sizeof(acc_input);
+		break;
+	case GYRO_IDX: /* gyroscope */
+		sensoraddr = mp2->vsbase + (GYRO_IDX * SENSOR_DATA_MEM_SIZE_DEFAULT) +
+			     OFFSET_SENSOR_DATA_DEFAULT;
+		memcpy_fromio(&gyro_data, sensoraddr, sizeof(struct sfh_gyro_data));
+		get_common_inputs(&gyro_input.common_property, report_id);
+		gyro_input.in_angel_x_value = float_to_int(gyro_data.gyrodata.x) / 1000;
+		gyro_input.in_angel_y_value = float_to_int(gyro_data.gyrodata.y) / 1000;
+		gyro_input.in_angel_z_value = float_to_int(gyro_data.gyrodata.z) / 1000;
+		memcpy(input_report, &gyro_input, sizeof(gyro_input));
+		report_size = sizeof(gyro_input);
+		break;
+	case MAG_IDX: /* magnetometer */
+		sensoraddr = mp2->vsbase + (MAG_IDX * SENSOR_DATA_MEM_SIZE_DEFAULT) +
+			     OFFSET_SENSOR_DATA_DEFAULT;
+		memcpy_fromio(&mag_data, sensoraddr, sizeof(struct sfh_mag_data));
+		get_common_inputs(&magno_input.common_property, report_id);
+		magno_input.in_magno_x = float_to_int(mag_data.magdata.x) / 100;
+		magno_input.in_magno_y = float_to_int(mag_data.magdata.y) / 100;
+		magno_input.in_magno_z = float_to_int(mag_data.magdata.z) / 100;
+		magno_input.in_magno_accuracy = mag_data.accuracy / 100;
+		memcpy(input_report, &magno_input, sizeof(magno_input));
+		report_size = sizeof(magno_input);
+		break;
+	case ALS_IDX:
+		sensoraddr = mp2->vsbase + (ALS_IDX * SENSOR_DATA_MEM_SIZE_DEFAULT) +
+			     OFFSET_SENSOR_DATA_DEFAULT;
+		memcpy_fromio(&als_data, sensoraddr, sizeof(struct sfh_als_data));
+		get_common_inputs(&als_input.common_property, report_id);
+		als_input.illuminance_value = als_data.lux;
+		report_size = sizeof(als_input);
+		memcpy(input_report, &als_input, sizeof(als_input));
+		break;
+	case HPD_IDX:
+		get_common_inputs(&hpd_input.common_property, report_id);
+		hpdstatus.val = readl(mp2->mmio + AMD_C2P_MSG(4));
+		hpd_input.human_presence = hpdstatus.shpd.presence;
+		report_size = sizeof(hpd_input);
+		memcpy(input_report, &hpd_input, sizeof(hpd_input));
+		break;
+	}
+	return report_size;
+}
+
+static u32 get_desc_size(int sensor_idx, int descriptor_name)
+{
+	switch (sensor_idx) {
+	case ACCEL_IDX:
+		switch (descriptor_name) {
+		case descr_size:
+			return sizeof(accel3_report_descriptor);
+		case input_size:
+			return sizeof(struct accel3_input_report);
+		case feature_size:
+			return sizeof(struct accel3_feature_report);
+		}
+		break;
+	case GYRO_IDX:
+		switch (descriptor_name) {
+		case descr_size:
+			return sizeof(gyro3_report_descriptor);
+		case input_size:
+			return sizeof(struct gyro_input_report);
+		case feature_size:
+			return sizeof(struct gyro_feature_report);
+		}
+		break;
+	case MAG_IDX:
+		switch (descriptor_name) {
+		case descr_size:
+			return sizeof(comp3_report_descriptor);
+		case input_size:
+			return sizeof(struct magno_input_report);
+		case feature_size:
+			return sizeof(struct magno_feature_report);
+		}
+		break;
+	case ALS_IDX:
+		switch (descriptor_name) {
+		case descr_size:
+			return sizeof(als_report_descriptor);
+		case input_size:
+			return sizeof(struct als_input_report);
+		case feature_size:
+			return sizeof(struct als_feature_report);
+		}
+		break;
+	case HPD_IDX:
+		switch (descriptor_name) {
+		case descr_size:
+			return sizeof(hpd_report_descriptor);
+		case input_size:
+			return sizeof(struct hpd_input_report);
+		case feature_size:
+			return sizeof(struct hpd_feature_report);
+		}
+		break;
+	}
+
+	return 0;
+}
+
+void amd_sfh1_1_set_desc_ops(struct amd_mp2_ops *mp2_ops)
+{
+	mp2_ops->get_rep_desc = get_report_desc;
+	mp2_ops->get_feat_rep = get_feature_rep;
+	mp2_ops->get_desc_sz = get_desc_size;
+	mp2_ops->get_in_rep = get_input_rep;
+}

drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c

···
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AMD MP2 1.1 communication driver
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Basavaraj Natikar <[e-mail]>
+ */
+
+#include <linux/delay.h>
+#include <linux/hid.h>
+
+#include "amd_sfh_init.h"
+#include "amd_sfh_interface.h"
+#include "../hid_descriptor/amd_sfh_hid_desc.h"
+
+static int amd_sfh_get_sensor_num(struct amd_mp2_dev *mp2, u8 *sensor_id)
+{
+	struct sfh_sensor_list *slist;
+	struct sfh_base_info binfo;
+	int num_of_sensors = 0;
+	int i;
+
+	memcpy_fromio(&binfo, mp2->vsbase, sizeof(struct sfh_base_info));
+	slist = &binfo.sbase.s_list;
+
+	for (i = 0; i < MAX_IDX; i++) {
+		switch (i) {
+		case ACCEL_IDX:
+		case GYRO_IDX:
+		case MAG_IDX:
+		case ALS_IDX:
+		case HPD_IDX:
+			if (BIT(i) & slist->sl.sensors)
+				sensor_id[num_of_sensors++] = i;
+			break;
+		}
+	}
+
+	return num_of_sensors;
+}
+
+static u32 amd_sfh_wait_for_response(struct amd_mp2_dev *mp2, u8 sid, u32 cmd_id)
+{
+	if (mp2->mp2_ops->response)
+		return mp2->mp2_ops->response(mp2, sid, cmd_id);
+
+	return 0;
+}
+
+static const char *get_sensor_name(int idx)
+{
+	switch (idx) {
+	case ACCEL_IDX:
+		return "accelerometer";
+	case GYRO_IDX:
+		return "gyroscope";
+	case MAG_IDX:
+		return "magnetometer";
+	case ALS_IDX:
+		return "ALS";
+	case HPD_IDX:
+		return "HPD";
+	default:
+		return "unknown sensor type";
+	}
+}
+
+static int amd_sfh_hid_client_deinit(struct amd_mp2_dev *privdata)
+{
+	struct amdtp_cl_data *cl_data = privdata->cl_data;
+	int i, status;
+
+	for (i = 0; i < cl_data->num_hid_devices; i++) {
+		if (cl_data->sensor_sts[i] == SENSOR_ENABLED) {
+			privdata->mp2_ops->stop(privdata, cl_data->sensor_idx[i]);
+			status = amd_sfh_wait_for_response
+					(privdata, cl_data->sensor_idx[i], DISABLE_SENSOR);
+			if (status == 0)
+				cl_data->sensor_sts[i] = SENSOR_DISABLED;
+			dev_dbg(&privdata->pdev->dev, "stopping sid 0x%x (%s) status 0x%x\n",
+				cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
+				cl_data->sensor_sts[i]);
+		}
+	}
+
+	cancel_delayed_work_sync(&cl_data->work);
+	cancel_delayed_work_sync(&cl_data->work_buffer);
+	amdtp_hid_remove(cl_data);
+
+	return 0;
+}
+
+static int amd_sfh1_1_hid_client_init(struct amd_mp2_dev *privdata)
+{
+	struct amd_input_data *in_data = &privdata->in_data;
+	struct amdtp_cl_data *cl_data = privdata->cl_data;
+	struct amd_mp2_ops *mp2_ops = privdata->mp2_ops;
+	struct amd_mp2_sensor_info info;
+	struct request_list *req_list;
+	u32 feature_report_size;
+	u32 input_report_size;
+	struct device *dev;
+	int rc, i, status;
+	u8 cl_idx;
+
+	req_list = &cl_data->req_list;
+	dev = &privdata->pdev->dev;
+	amd_sfh1_1_set_desc_ops(mp2_ops);
+
+	cl_data->num_hid_devices = amd_sfh_get_sensor_num(privdata, &cl_data->sensor_idx[0]);
+
+	INIT_DELAYED_WORK(&cl_data->work, amd_sfh_work);
+	INIT_DELAYED_WORK(&cl_data->work_buffer, amd_sfh_work_buffer);
+	INIT_LIST_HEAD(&req_list->list);
+	cl_data->in_data = in_data;
+
+	for (i = 0; i < cl_data->num_hid_devices; i++) {
+		cl_data->sensor_sts[i] = SENSOR_DISABLED;
+		cl_data->sensor_requested_cnt[i] = 0;
+		cl_data->cur_hid_dev = i;
+		cl_idx = cl_data->sensor_idx[i];
+
+		cl_data->report_descr_sz[i] = mp2_ops->get_desc_sz(cl_idx, descr_size);
+		if (!cl_data->report_descr_sz[i]) {
+			rc = -EINVAL;
+			goto cleanup;
+		}
+		feature_report_size = mp2_ops->get_desc_sz(cl_idx, feature_size);
+		if (!feature_report_size) {
+			rc = -EINVAL;
+			goto cleanup;
+		}
+		input_report_size =  mp2_ops->get_desc_sz(cl_idx, input_size);
+		if (!input_report_size) {
+			rc = -EINVAL;
+			goto cleanup;
+		}
+		cl_data->feature_report[i] = devm_kzalloc(dev, feature_report_size, GFP_KERNEL);
+		if (!cl_data->feature_report[i]) {
+			rc = -ENOMEM;
+			goto cleanup;
+		}
+		in_data->input_report[i] = devm_kzalloc(dev, input_report_size, GFP_KERNEL);
+		if (!in_data->input_report[i]) {
+			rc = -ENOMEM;
+			goto cleanup;
+		}
+
+		info.sensor_idx = cl_idx;
+
+		cl_data->report_descr[i] =
+			devm_kzalloc(dev, cl_data->report_descr_sz[i], GFP_KERNEL);
+		if (!cl_data->report_descr[i]) {
+			rc = -ENOMEM;
+			goto cleanup;
+		}
+		rc = mp2_ops->get_rep_desc(cl_idx, cl_data->report_descr[i]);
+		if (rc)
+			return rc;
+
+		writel(0, privdata->mmio + AMD_P2C_MSG(0));
+		mp2_ops->start(privdata, info);
+		status = amd_sfh_wait_for_response
+				(privdata, cl_data->sensor_idx[i], ENABLE_SENSOR);
+
+		status = (status == 0) ? SENSOR_ENABLED : SENSOR_DISABLED;
+
+		if (status == SENSOR_ENABLED) {
+			cl_data->sensor_sts[i] = SENSOR_ENABLED;
+			rc = amdtp_hid_probe(i, cl_data);
+			if (rc) {
+				mp2_ops->stop(privdata, cl_data->sensor_idx[i]);
+				status = amd_sfh_wait_for_response
+					(privdata, cl_data->sensor_idx[i], DISABLE_SENSOR);
+				if (status == 0)
+					status = SENSOR_DISABLED;
+				if (status != SENSOR_ENABLED)
+					cl_data->sensor_sts[i] = SENSOR_DISABLED;
+				dev_dbg(dev, "sid 0x%x (%s) status 0x%x\n",
+					cl_data->sensor_idx[i],
+					get_sensor_name(cl_data->sensor_idx[i]),
+					cl_data->sensor_sts[i]);
+				goto cleanup;
+			}
+		}
+		dev_dbg(dev, "sid 0x%x (%s) status 0x%x\n",
+			cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
+			cl_data->sensor_sts[i]);
+	}
+
+	schedule_delayed_work(&cl_data->work_buffer, msecs_to_jiffies(AMD_SFH_IDLE_LOOP));
+	return 0;
+
+cleanup:
+	amd_sfh_hid_client_deinit(privdata);
+	for (i = 0; i < cl_data->num_hid_devices; i++) {
+		devm_kfree(dev, cl_data->feature_report[i]);
+		devm_kfree(dev, in_data->input_report[i]);
+		devm_kfree(dev, cl_data->report_descr[i]);
+	}
+	return rc;
+}
+
+static void amd_sfh_resume(struct amd_mp2_dev *mp2)
+{
+	struct amdtp_cl_data *cl_data = mp2->cl_data;
+	struct amd_mp2_sensor_info info;
+	int i, status;
+
+	for (i = 0; i < cl_data->num_hid_devices; i++) {
+		if (cl_data->sensor_sts[i] == SENSOR_DISABLED) {
+			info.sensor_idx = cl_data->sensor_idx[i];
+			mp2->mp2_ops->start(mp2, info);
+			status = amd_sfh_wait_for_response
+					(mp2, cl_data->sensor_idx[i], ENABLE_SENSOR);
+			if (status == 0)
+				status = SENSOR_ENABLED;
+			if (status == SENSOR_ENABLED)
+				cl_data->sensor_sts[i] = SENSOR_ENABLED;
+			dev_dbg(&mp2->pdev->dev, "resume sid 0x%x (%s) status 0x%x\n",
+				cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
+				cl_data->sensor_sts[i]);
+		}
+	}
+
+	schedule_delayed_work(&cl_data->work_buffer, msecs_to_jiffies(AMD_SFH_IDLE_LOOP));
+	amd_sfh_clear_intr(mp2);
+}
+
+static void amd_sfh_suspend(struct amd_mp2_dev *mp2)
+{
+	struct amdtp_cl_data *cl_data = mp2->cl_data;
+	int i, status;
+
+	for (i = 0; i < cl_data->num_hid_devices; i++) {
+		if (cl_data->sensor_idx[i] != HPD_IDX &&
+		    cl_data->sensor_sts[i] == SENSOR_ENABLED) {
+			mp2->mp2_ops->stop(mp2, cl_data->sensor_idx[i]);
+			status = amd_sfh_wait_for_response
+					(mp2, cl_data->sensor_idx[i], DISABLE_SENSOR);
+			if (status == 0)
+				status = SENSOR_DISABLED;
+			if (status != SENSOR_ENABLED)
+				cl_data->sensor_sts[i] = SENSOR_DISABLED;
+			dev_dbg(&mp2->pdev->dev, "suspend sid 0x%x (%s) status 0x%x\n",
+				cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
+				cl_data->sensor_sts[i]);
+		}
+	}
+
+	cancel_delayed_work_sync(&cl_data->work_buffer);
+	amd_sfh_clear_intr(mp2);
+}
+
+static void amd_mp2_pci_remove(void *privdata)
+{
+	struct amd_mp2_dev *mp2 = privdata;
+
+	amd_sfh_hid_client_deinit(privdata);
+	mp2->mp2_ops->stop_all(mp2);
+	pci_intx(mp2->pdev, false);
+	amd_sfh_clear_intr(mp2);
+}
+
+static void amd_sfh_set_ops(struct amd_mp2_dev *mp2)
+{
+	struct amd_mp2_ops *mp2_ops;
+
+	sfh_interface_init(mp2);
+	mp2_ops = mp2->mp2_ops;
+	mp2_ops->clear_intr = amd_sfh_clear_intr_v2,
+	mp2_ops->init_intr = amd_sfh_irq_init_v2,
+	mp2_ops->suspend = amd_sfh_suspend;
+	mp2_ops->resume = amd_sfh_resume;
+	mp2_ops->remove = amd_mp2_pci_remove;
+}
+
+int amd_sfh1_1_init(struct amd_mp2_dev *mp2)
+{
+	u32 phy_base = readl(mp2->mmio + AMD_C2P_MSG(22));
+	struct device *dev = &mp2->pdev->dev;
+	struct sfh_base_info binfo;
+	int rc;
+
+	phy_base <<= 21;
+	if (!devm_request_mem_region(dev, phy_base, 128 * 1024, "amd_sfh")) {
+		dev_err(dev, "can't reserve mmio registers\n");
+		return -ENOMEM;
+	}
+
+	mp2->vsbase = devm_ioremap(dev, phy_base, 128 * 1024);
+	if (!mp2->vsbase) {
+		dev_err(dev, "failed to remap vsbase\n");
+		return -ENOMEM;
+	}
+
+	/* Before accessing give time for SFH firmware for processing configuration */
+	msleep(5000);
+
+	memcpy_fromio(&binfo, mp2->vsbase, sizeof(struct sfh_base_info));
+	if (binfo.sbase.fw_info.fw_ver == 0 || binfo.sbase.s_list.sl.sensors == 0) {
+		dev_err(dev, "failed to get sensors\n");
+		return -EOPNOTSUPP;
+	}
+	dev_dbg(dev, "firmware version 0x%x\n", binfo.sbase.fw_info.fw_ver);
+
+	amd_sfh_set_ops(mp2);
+
+	rc = amd_sfh_irq_init(mp2);
+	if (rc) {
+		dev_err(dev, "amd_sfh_irq_init failed\n");
+		return rc;
+	}
+
+	rc = amd_sfh1_1_hid_client_init(mp2);
+	if (rc) {
+		dev_err(dev, "amd_sfh1_1_hid_client_init failed\n");
+		return rc;
+	}
+
+	return rc;
+}

drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.h

···
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * AMD MP2 1.1 initialization structures
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Basavaraj Natikar <[e-mail]>
+ */
+
+#ifndef AMD_SFH_INIT_H
+#define AMD_SFH_INIT_H
+
+#include "../amd_sfh_common.h"
+
+struct amd_sfh1_1_ops {
+	int (*init)(struct amd_mp2_dev *mp2);
+};
+
+int amd_sfh1_1_init(struct amd_mp2_dev *mp2);
+
+static const struct amd_sfh1_1_ops __maybe_unused sfh1_1_ops = {
+	.init = amd_sfh1_1_init,
+};
+
+#endif

drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_interface.c

···
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * AMD MP2 1.1 communication interfaces
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Basavaraj Natikar <[e-mail]>
+ */
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/iopoll.h>
+
+#include "amd_sfh_interface.h"
+
+static int amd_sfh_wait_response(struct amd_mp2_dev *mp2, u8 sid, u32 cmd_id)
+{
+	struct sfh_cmd_response cmd_resp;
+
+	/* Get response with status within a max of 1600 ms timeout */
+	if (!readl_poll_timeout(mp2->mmio + AMD_P2C_MSG(0), cmd_resp.resp,
+				(cmd_resp.response.response == 0 &&
+				cmd_resp.response.cmd_id == cmd_id && (sid == 0xff ||
+				cmd_resp.response.sensor_id == sid)), 500, 1600000))
+		return cmd_resp.response.response;
+
+	return -1;
+}
+
+static void amd_start_sensor(struct amd_mp2_dev *privdata, struct amd_mp2_sensor_info info)
+{
+	struct sfh_cmd_base cmd_base;
+
+	cmd_base.ul = 0;
+	cmd_base.cmd.cmd_id = ENABLE_SENSOR;
+	cmd_base.cmd.intr_disable = 0;
+	cmd_base.cmd.sensor_id = info.sensor_idx;
+
+	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
+}
+
+static void amd_stop_sensor(struct amd_mp2_dev *privdata, u16 sensor_idx)
+{
+	struct sfh_cmd_base cmd_base;
+
+	cmd_base.ul = 0;
+	cmd_base.cmd.cmd_id = DISABLE_SENSOR;
+	cmd_base.cmd.intr_disable = 0;
+	cmd_base.cmd.sensor_id = sensor_idx;
+
+	writeq(0x0, privdata->mmio + AMD_C2P_MSG(1));
+	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
+}
+
+static void amd_stop_all_sensor(struct amd_mp2_dev *privdata)
+{
+	struct sfh_cmd_base cmd_base;
+
+	cmd_base.ul = 0;
+	cmd_base.cmd.cmd_id = STOP_ALL_SENSORS;
+	cmd_base.cmd.intr_disable = 0;
+
+	writel(cmd_base.ul, privdata->mmio + AMD_C2P_MSG(0));
+}
+
+static struct amd_mp2_ops amd_sfh_ops = {
+	.start = amd_start_sensor,
+	.stop = amd_stop_sensor,
+	.stop_all = amd_stop_all_sensor,
+	.response = amd_sfh_wait_response,
+};
+
+void sfh_interface_init(struct amd_mp2_dev *mp2)
+{
+	mp2->mp2_ops = &amd_sfh_ops;
+}

drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_interface.h

···
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * AMD MP2 1.1 communication interfaces
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Basavaraj Natikar <[e-mail]>
+ */
+
+#ifndef AMD_SFH_INTERFACE_H
+#define AMD_SFH_INTERFACE_H
+
+#include "../amd_sfh_common.h"
+
+#define SENSOR_DATA_MEM_SIZE_DEFAULT		256
+#define TOTAL_STATIC_MEM_DEFAULT		1024
+#define OFFSET_SFH_INFO_BASE_DEFAULT		0
+#define OFFSET_SENSOR_DATA_DEFAULT		(OFFSET_SFH_INFO_BASE_DEFAULT + \
+							TOTAL_STATIC_MEM_DEFAULT)
+enum sensor_index {
+	ACCEL_IDX,
+	GYRO_IDX,
+	MAG_IDX,
+	ALS_IDX = 4,
+	HPD_IDX = 5,
+	MAX_IDX = 15,
+};
+
+struct sfh_cmd_base {
+	union {
+		u32 ul;
+		struct {
+			u32 sensor_id		: 4;
+			u32 cmd_id		: 4;
+			u32 sub_cmd_id		: 6;
+			u32 length		: 12;
+			u32 rsvd		: 5;
+			u32 intr_disable	: 1;
+		} cmd;
+	};
+};
+
+struct sfh_cmd_response {
+	union {
+		u32 resp;
+		struct {
+			u32 response	: 8;
+			u32 sensor_id	: 4;
+			u32 cmd_id	: 4;
+			u32 sub_cmd	: 6;
+			u32 rsvd2	: 10;
+		} response;
+	};
+};
+
+struct sfh_platform_info {
+	union {
+		u32 pi;
+		struct {
+			u32 cust_id		: 16;
+			u32 plat_id		: 6;
+			u32 interface_id	: 4;
+			u32 rsvd		: 6;
+		} pinfo;
+	};
+};
+
+struct sfh_firmware_info {
+	union {
+		u32 fw_ver;
+		struct {
+			u32 minor_rev : 8;
+			u32 major_rev : 8;
+			u32 minor_ver : 8;
+			u32 major_ver : 8;
+		} fver;
+	};
+};
+
+struct sfh_sensor_list {
+	union {
+		u32 slist;
+		struct {
+			u32 sensors	: 16;
+			u32 rsvd	: 16;
+		} sl;
+	};
+};
+
+struct sfh_base_info {
+	union {
+		u32 sfh_base[24];
+		struct {
+			struct sfh_platform_info plat_info;
+			struct sfh_firmware_info  fw_info;
+			struct sfh_sensor_list s_list;
+		} sbase;
+	};
+};
+
+struct sfh_common_data {
+	u64 timestamp;
+	u32 intr_cnt;
+	u32 featvalid		: 16;
+	u32 rsvd		: 13;
+	u32 sensor_state	: 3;
+};
+
+struct sfh_float32 {
+	u32 x;
+	u32 y;
+	u32 z;
+};
+
+struct sfh_accel_data {
+	struct sfh_common_data commondata;
+	struct sfh_float32 acceldata;
+	u32 accelstatus;
+};
+
+struct sfh_gyro_data {
+	struct sfh_common_data commondata;
+	struct sfh_float32 gyrodata;
+	u32 result;
+};
+
+struct sfh_mag_data {
+	struct sfh_common_data commondata;
+	struct sfh_float32 magdata;
+	u32 accuracy;
+};
+
+struct sfh_als_data {
+	struct sfh_common_data commondata;
+	u16 lux;
+};
+
+struct hpd_status {
+	union {
+		struct {
+			u32 distance			: 16;
+			u32 probablity			: 8;
+			u32 presence			: 2;
+			u32 rsvd			: 5;
+			u32 state			: 1;
+		} shpd;
+		u32 val;
+	};
+};
+
+void sfh_interface_init(struct amd_mp2_dev *mp2);
+void amd_sfh1_1_set_desc_ops(struct amd_mp2_ops *mp2_ops);
+#endif

drivers/hid/hid-alps.c

···
 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY,
 		USB_VENDOR_ID_ALPS_JP, HID_DEVICE_ID_ALPS_U1) },
 	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY,
+		USB_VENDOR_ID_ALPS_JP, HID_DEVICE_ID_ALPS_U1_UNICORN_LEGACY) },
+	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY,
 		USB_VENDOR_ID_ALPS_JP, HID_DEVICE_ID_ALPS_T4_BTNLESS) },
 	{ }
 };

drivers/hid/hid-apple.c

···
 #define APPLE_NUMLOCK_EMULATION	BIT(8)
 #define APPLE_RDESC_BATTERY	BIT(9)
 #define APPLE_BACKLIGHT_CTL	BIT(10)
-#define APPLE_IS_KEYCHRON	BIT(11)
+#define APPLE_IS_NON_APPLE	BIT(11)
 
 #define APPLE_FLAG_FKEY		0x01
 
···
 MODULE_PARM_DESC(swap_fn_leftctrl, "Swap the Fn and left Control keys. "
 		"(For people who want to keep PC keyboard muscle memory. "
 		"[0] = as-is, Mac layout, 1 = swapped, PC layout)");
+
+struct apple_non_apple_keyboard {
+	char *name;
+};
 
 struct apple_sc_backlight {
 	struct led_classdev cdev;
···
 	{ }
 };
 
+static const struct apple_non_apple_keyboard non_apple_keyboards[] = {
+	{ "SONiX USB DEVICE" },
+	{ "Keychron" },
+	{ "AONE" },
+	{ "GANSS" }
+};
+
+static bool apple_is_non_apple_keyboard(struct hid_device *hdev)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(non_apple_keyboards); i++) {
+		char *non_apple = non_apple_keyboards[i].name;
+
+		if (strncmp(hdev->name, non_apple, strlen(non_apple)) == 0)
+			return true;
+	}
+
+	return false;
+}
+
 static inline void apple_setup_key_translation(struct input_dev *input,
 		const struct apple_key_translation *table)
 {
···
 	}
 
 	if (fnmode == 3) {
-		real_fnmode = (asc->quirks & APPLE_IS_KEYCHRON) ? 2 : 1;
+		real_fnmode = (asc->quirks & APPLE_IS_NON_APPLE) ? 2 : 1;
 	} else {
 		real_fnmode = fnmode;
 	}
···
 		asc->quirks &= ~APPLE_HAS_FN;
 	}
 
-	if (strncmp(hdev->name, "Keychron", 8) == 0) {
-		hid_info(hdev, "Keychron keyboard detected; function keys will default to fnmode=2 behavior\n");
-		asc->quirks |= APPLE_IS_KEYCHRON;
+	if (apple_is_non_apple_keyboard(hdev)) {
+		hid_info(hdev, "Non-apple keyboard detected; function keys will default to fnmode=2 behavior\n");
+		asc->quirks |= APPLE_IS_NON_APPLE;
 	}
 
 	return 0;

drivers/hid/hid-core.c

···
 
 	/* first retrieve all incoming values in data */
 	for (a = 0; a < report->maxfield; a++)
-		hid_input_fetch_field(hid, field = report->field[a], data);
+		hid_input_fetch_field(hid, report->field[a], data);
 
 	if (!list_empty(&report->field_entry_list)) {
 		/* INPUT_REPORT, we have a priority list of fields */

drivers/hid/hid-cp2112.c

···
 		data->word = le16_to_cpup((__le16 *)buf);
 		break;
 	case I2C_SMBUS_I2C_BLOCK_DATA:
+		if (read_length > I2C_SMBUS_BLOCK_MAX) {
+			ret = -EINVAL;
+			goto power_normal;
+		}
+
 		memcpy(data->block + 1, buf, read_length);
 		break;
 	case I2C_SMBUS_BLOCK_DATA:

drivers/hid/hid-ids.h

···
 #define USB_DEVICE_ID_ASUS_UX550VE_TOUCHSCREEN	0x2544
 #define USB_DEVICE_ID_ASUS_UX550_TOUCHSCREEN	0x2706
 #define I2C_DEVICE_ID_SURFACE_GO_TOUCHSCREEN	0x261A
+#define I2C_DEVICE_ID_SURFACE_GO2_TOUCHSCREEN	0x2A1C
 
 #define USB_VENDOR_ID_ELECOM		0x056e
 #define USB_DEVICE_ID_ELECOM_BM084	0x0061
···
 #define USB_DEVICE_ID_UGEE_XPPEN_TABLET_G540	0x0075
 #define USB_DEVICE_ID_UGEE_XPPEN_TABLET_G640	0x0094
 #define USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01	0x0042
+#define USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L	0x0935
 #define USB_DEVICE_ID_UGEE_XPPEN_TABLET_STAR06	0x0078
 #define USB_DEVICE_ID_UGEE_TABLET_G5		0x0074
 #define USB_DEVICE_ID_UGEE_TABLET_EX07S		0x0071

drivers/hid/hid-input.c

···
 	  HID_BATTERY_QUIRK_IGNORE },
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_SURFACE_GO_TOUCHSCREEN),
 	  HID_BATTERY_QUIRK_IGNORE },
+	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_SURFACE_GO2_TOUCHSCREEN),
+	  HID_BATTERY_QUIRK_IGNORE },
 	{}
 };
 

drivers/hid/hid-lg-g15.c

···
 
 	/*
 	 * Some models have multiple interfaces, we want the interface with
-	 * with the f000.0000 application input report.
+	 * the f000.0000 application input report.
 	 */
 	rep_enum = &hdev->report_enum[HID_INPUT_REPORT];
 	list_for_each_entry(rep, &rep_enum->report_list, list) {

drivers/hid/hid-logitech-hidpp.c

···
 			val->strval = hidpp->hid_dev->uniq;
 			break;
 		case POWER_SUPPLY_PROP_VOLTAGE_NOW:
-			/* hardware reports voltage in in mV. sysfs expects uV */
+			/* hardware reports voltage in mV. sysfs expects uV */
 			val->intval = hidpp->battery.voltage * 1000;
 			break;
 		case POWER_SUPPLY_PROP_CHARGE_TYPE:

drivers/hid/hid-mcp2221.c

···
 		data_len = 7;
 		break;
 	default:
+		if (len > I2C_SMBUS_BLOCK_MAX)
+			return -EINVAL;
+
 		memcpy(&mcp->txbuf[5], buf, len);
 		data_len = len + 5;
 	}

drivers/hid/hid-multitouch.c

···
 #define MT_CLS_WIN_8_FORCE_MULTI_INPUT		0x0015
 #define MT_CLS_WIN_8_DISABLE_WAKEUP		0x0016
 #define MT_CLS_WIN_8_NO_STICKY_FINGERS		0x0017
+#define MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU	0x0018
 
 /* vendor specific classes */
 #define MT_CLS_3M				0x0101
···
 			MT_QUIRK_STICKY_FINGERS |
 			MT_QUIRK_WIN8_PTP_BUTTONS |
 			MT_QUIRK_FORCE_MULTI_INPUT,
+		.export_all_inputs = true },
+	{ .name = MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU,
+		.quirks = MT_QUIRK_IGNORE_DUPLICATES |
+			MT_QUIRK_HOVERING |
+			MT_QUIRK_CONTACT_CNT_ACCURATE |
+			MT_QUIRK_STICKY_FINGERS |
+			MT_QUIRK_WIN8_PTP_BUTTONS |
+			MT_QUIRK_FORCE_MULTI_INPUT |
+			MT_QUIRK_NOT_SEEN_MEANS_UP,
 		.export_all_inputs = true },
 	{ .name = MT_CLS_WIN_8_DISABLE_WAKEUP,
 		.quirks = MT_QUIRK_ALWAYS_VALID |
···
 		case HID_DG_CONFIDENCE:
 			if ((cls->name == MT_CLS_WIN_8 ||
 			     cls->name == MT_CLS_WIN_8_FORCE_MULTI_INPUT ||
+			     cls->name == MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU ||
 			     cls->name == MT_CLS_WIN_8_DISABLE_WAKEUP) &&
 				(field->application == HID_DG_TOUCHPAD ||
 				 field->application == HID_DG_TOUCHSCREEN))
···
 			   USB_DEVICE_ID_LENOVO_X1_TAB3) },
 
 	/* Lenovo X12 TAB Gen 1 */
-	{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT,
+	{ .driver_data = MT_CLS_WIN_8_FORCE_MULTI_INPUT_NSMU,
 		HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH_WIN_8,
 			   USB_VENDOR_ID_LENOVO,
 			   USB_DEVICE_ID_LENOVO_X12_TAB) },

drivers/hid/hid-nintendo.c

···
 };
 static const u16 JC_RUMBLE_DFLT_LOW_FREQ = 160;
 static const u16 JC_RUMBLE_DFLT_HIGH_FREQ = 320;
+static const unsigned short JC_RUMBLE_ZERO_AMP_PKT_CNT = 5;
 #endif /* IS_ENABLED(CONFIG_NINTENDO_FF) */
 static const u16 JC_RUMBLE_PERIOD_MS = 50;
 
···
 #define JC_MAX_RESP_SIZE	(sizeof(struct joycon_input_report) + 35)
 #define JC_RUMBLE_DATA_SIZE	8
 #define JC_RUMBLE_QUEUE_SIZE	8
-
-static const unsigned short JC_RUMBLE_ZERO_AMP_PKT_CNT = 5;
 
 static const char * const joycon_player_led_names[] = {
 	LED_FUNCTION_PLAYER1,
···
 /* We report joy-con d-pad inputs as buttons and pro controller as a hat. */
 static const unsigned int joycon_dpad_inputs_jc[] = {
 	BTN_DPAD_UP, BTN_DPAD_DOWN, BTN_DPAD_LEFT, BTN_DPAD_RIGHT,
+	0 /* 0 signals end of array */
 };
 
 static int joycon_input_create(struct joycon_ctlr *ctlr)
···
 	ctlr->input->id.version = hdev->version;
 	ctlr->input->uniq = ctlr->mac_addr_str;
 	ctlr->input->name = name;
+	ctlr->input->phys = hdev->phys;
 	input_set_drvdata(ctlr->input, ctlr);
 
 	/* set up sticks and buttons */
···
 	ctlr->imu_input->id.version = hdev->version;
 	ctlr->imu_input->uniq = ctlr->mac_addr_str;
 	ctlr->imu_input->name = imu_name;
+	ctlr->imu_input->phys = hdev->phys;
 	input_set_drvdata(ctlr->imu_input, ctlr);
 
 	/* configure imu axes */

drivers/hid/hid-uclogic-core.c

···
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
+				USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 				USB_DEVICE_ID_UGEE_XPPEN_TABLET_STAR06) },
 	{ }
 };

drivers/hid/hid-uclogic-params.c

···
 /**
  * uclogic_params_pen_inrange_to_str() - Convert a pen in-range reporting type
  *                                       to a string.
- *
  * @inrange:	The in-range reporting type to convert.
  *
- * Returns:
- *	The string representing the type, or NULL if the type is unknown.
+ * Return:
+ * * The string representing the type, or
+ * * %NULL if the type is unknown.
  */
 static const char *uclogic_params_pen_inrange_to_str(
 				enum uclogic_params_pen_inrange inrange)
···
 }
 
 /**
- * Dump tablet interface pen parameters with hid_dbg(), indented with one tab.
- *
+ * uclogic_params_pen_hid_dbg() - Dump tablet interface pen parameters
  * @hdev:	The HID device the pen parameters describe.
  * @pen:	The pen parameters to dump.
+ *
+ * Dump tablet interface pen parameters with hid_dbg(). The dump is indented
+ * with a tab.
  */
 static void uclogic_params_pen_hid_dbg(const struct hid_device *hdev,
 					const struct uclogic_params_pen *pen)
···
 }
 
 /**
- * Dump tablet interface frame parameters with hid_dbg(), indented with two
- * tabs.
- *
+ * uclogic_params_frame_hid_dbg() - Dump tablet interface frame parameters
  * @hdev:	The HID device the pen parameters describe.
  * @frame:	The frame parameters to dump.
+ *
+ * Dump tablet interface frame parameters with hid_dbg(). The dump is
+ * indented with two tabs.
  */
 static void uclogic_params_frame_hid_dbg(
 				const struct hid_device *hdev,
···
 }
 
 /**
- * Dump tablet interface parameters with hid_dbg().
- *
+ * uclogic_params_hid_dbg() - Dump tablet interface parameters
  * @hdev:	The HID device the parameters describe.
  * @params:	The parameters to dump.
+ *
+ * Dump tablet interface parameters with hid_dbg().
  */
 void uclogic_params_hid_dbg(const struct hid_device *hdev,
 				const struct uclogic_params *params)
···
 	const int len = 12;
 	s32 resolution;
 	/* Pen report descriptor template parameters */
-	s32 desc_params[UCLOGIC_RDESC_PEN_PH_ID_NUM];
+	s32 desc_params[UCLOGIC_RDESC_PH_ID_NUM];
 	__u8 *desc_ptr = NULL;
 
 	/* Check arguments */
···
 	size_t i;
 	s32 resolution;
 	/* Pen report descriptor template parameters */
-	s32 desc_params[UCLOGIC_RDESC_PEN_PH_ID_NUM];
+	s32 desc_params[UCLOGIC_RDESC_PH_ID_NUM];
 	__u8 *desc_ptr = NULL;
 
 	/* Check arguments */
···
 }
 
 /**
+ * uclogic_probe_interface() - some tablets, like the Parblo A610 PLUS V2 or
+ * the XP-PEN Deco Mini 7, need to be initialized by sending them magic data.
+ *
+ * @hdev:	The HID device of the tablet interface to initialize and get
+ *		parameters from. Cannot be NULL.
+ * @magic_arr:	The magic data that should be sent to probe the interface.
+ *		Cannot be NULL.
+ * @magic_size:	Size of the magic data.
+ * @endpoint:	Endpoint where the magic data should be sent.
+ *
+ * Returns:
+ *	Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_probe_interface(struct hid_device *hdev, u8 *magic_arr,
+				   int magic_size, int endpoint)
+{
+	struct usb_device *udev;
+	unsigned int pipe = 0;
+	int sent;
+	u8 *buf = NULL;
+	int rc = 0;
+
+	if (!hdev || !magic_arr) {
+		rc = -EINVAL;
+		goto cleanup;
+	}
+
+	buf = kmemdup(magic_arr, magic_size, GFP_KERNEL);
+	if (!buf) {
+		rc = -ENOMEM;
+		goto cleanup;
+	}
+
+	udev = hid_to_usb_dev(hdev);
+	pipe = usb_sndintpipe(udev, endpoint);
+
+	rc = usb_interrupt_msg(udev, pipe, buf, magic_size, &sent, 1000);
+	if (rc || sent != magic_size) {
+		hid_err(hdev, "Interface probing failed: %d\n", rc);
+		rc = -1;
+		goto cleanup;
+	}
+
+	rc = 0;
+cleanup:
+	kfree(buf);
+	return rc;
+}
+
+/**
+ * uclogic_params_ugee_v2_init() - initialize a UGEE graphics tablets by
+ * discovering their parameters.
+ *
+ * These tables, internally designed as v2 to differentiate them from older
+ * models, expect a payload of magic data in orther to be switched to the fully
+ * functional mode and expose their parameters in a similar way to the
+ * information present in uclogic_params_pen_init_v1() but with some
+ * differences.
+ *
+ * @params:	Parameters to fill in (to be cleaned with
+ *		uclogic_params_cleanup()). Not modified in case of error.
+ *		Cannot be NULL.
+ * @hdev:	The HID device of the tablet interface to initialize and get
+ *		parameters from. Cannot be NULL.
+ *
+ * Returns:
+ *	Zero, if successful. A negative errno code on error.
+ */
+static int uclogic_params_ugee_v2_init(struct uclogic_params *params,
+				       struct hid_device *hdev)
+{
+	int rc = 0;
+	struct usb_interface *iface;
+	__u8 bInterfaceNumber;
+	const int str_desc_len = 12;
+	__u8 *str_desc = NULL;
+	__u8 *rdesc_pen = NULL;
+	__u8 *rdesc_frame = NULL;
+	s32 desc_params[UCLOGIC_RDESC_PH_ID_NUM];
+	s32 resolution;
+	__u8 magic_arr[] = {
+		0x02, 0xb0, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+	};
+	/* The resulting parameters (noop) */
+	struct uclogic_params p = {0, };
+
+	if (!params || !hdev) {
+		rc = -EINVAL;
+		goto cleanup;
+	}
+
+	iface = to_usb_interface(hdev->dev.parent);
+	bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber;
+	if (bInterfaceNumber != 2) {
+		uclogic_params_init_invalid(&p);
+		goto output;
+	}
+
+	/*
+	 * Initialize the interface by sending magic data.
+	 * The specific data was discovered by sniffing the Windows driver
+	 * traffic.
+	 */
+	rc = uclogic_probe_interface(hdev, magic_arr, sizeof(magic_arr), 0x03);
+	if (rc) {
+		uclogic_params_init_invalid(&p);
+		goto output;
+	}
+
+	/*
+	 * Read the string descriptor containing pen and frame parameters.
+	 * The specific string descriptor and data were discovered by sniffing
+	 * the Windows driver traffic.
+	 */
+	rc = uclogic_params_get_str_desc(&str_desc, hdev, 100, str_desc_len);
+	if (rc != str_desc_len) {
+		hid_err(hdev, "failed retrieving pen and frame parameters: %d\n", rc);
+		uclogic_params_init_invalid(&p);
+		goto output;
+	}
+
+	desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_LM] =
+		get_unaligned_le16(str_desc + 2);
+	desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_LM] =
+		get_unaligned_le16(str_desc + 4);
+	desc_params[UCLOGIC_RDESC_FRAME_PH_ID_UM] = str_desc[6];
+	desc_params[UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM] =
+		get_unaligned_le16(str_desc + 8);
+	resolution = get_unaligned_le16(str_desc + 10);
+	if (resolution == 0) {
+		desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0;
+		desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_PM] = 0;
+	} else {
+		desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_PM] =
+			desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_LM] * 1000 /
+			resolution;
+		desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_PM] =
+			desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_LM] * 1000 /
+			resolution;
+	}
+	kfree(str_desc);
+	str_desc = NULL;
+
+	/* Initialize the pen interface */
+	rdesc_pen = uclogic_rdesc_template_apply(
+				uclogic_rdesc_ugee_v2_pen_template_arr,
+				uclogic_rdesc_ugee_v2_pen_template_size,
+				desc_params, ARRAY_SIZE(desc_params));
+	if (!rdesc_pen) {
+		rc = -ENOMEM;
+		goto cleanup;
+	}
+
+	p.pen.desc_ptr = rdesc_pen;
+	p.pen.desc_size = uclogic_rdesc_ugee_v2_pen_template_size;
+	p.pen.id = 0x02;
+	p.pen.subreport_list[0].value = 0xf0;
+	p.pen.subreport_list[0].id = UCLOGIC_RDESC_V1_FRAME_ID;
+
+	/* Initialize the frame interface */
+	rdesc_frame = uclogic_rdesc_template_apply(
+				uclogic_rdesc_ugee_v2_frame_btn_template_arr,
+				uclogic_rdesc_ugee_v2_frame_btn_template_size,
+				desc_params, ARRAY_SIZE(desc_params));
+	if (!rdesc_frame) {
+		rc = -ENOMEM;
+		goto cleanup;
+	}
+
+	rc = uclogic_params_frame_init_with_desc(&p.frame_list[0],
+						 rdesc_frame,
+						 uclogic_rdesc_ugee_v2_frame_btn_template_size,
+						 UCLOGIC_RDESC_V1_FRAME_ID);
+	kfree(rdesc_frame);
+	if (rc) {
+		uclogic_params_init_invalid(&p);
+		goto output;
+	}
+
+output:
+	/* Output parameters */
+	memcpy(params, &p, sizeof(*params));
+	memset(&p, 0, sizeof(p));
+	rc = 0;
+cleanup:
+	kfree(str_desc);
+	uclogic_params_cleanup(&p);
+	return rc;
+}
+
+/**
  * uclogic_params_init() - initialize a tablet interface and discover its
  * parameters.
  *
···
 		} else {
 			uclogic_params_init_invalid(&p);
 		}
+		break;
+	case VID_PID(USB_VENDOR_ID_UGEE,
+		     USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L):
+		rc = uclogic_params_ugee_v2_init(&p, hdev);
+		if (rc != 0)
+			goto cleanup;
 		break;
 	case VID_PID(USB_VENDOR_ID_TRUST,
 		     USB_DEVICE_ID_TRUST_PANORA_TABLET):

drivers/hid/hid-uclogic-rdesc-test.c

···
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ *  HID driver for UC-Logic devices not fully compliant with HID standard
+ *
+ *  Copyright (c) 2022 José Expósito <[e-mail]>
+ */
+
+#include <kunit/test.h>
+#include "./hid-uclogic-rdesc.h"
+
+struct uclogic_template_case {
+	const char *name;
+	const __u8 *template;
+	size_t template_size;
+	const s32 *param_list;
+	size_t param_num;
+	const __u8 *expected;
+};
+
+static const s32 params_pen_all[UCLOGIC_RDESC_PH_ID_NUM] = {
+	[UCLOGIC_RDESC_PEN_PH_ID_X_LM] = 0xAA,
+	[UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0xBB,
+	[UCLOGIC_RDESC_PEN_PH_ID_Y_LM] = 0xCC,
+	[UCLOGIC_RDESC_PEN_PH_ID_Y_PM] = 0xDD,
+	[UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM] = 0xEE,
+};
+
+static const s32 params_pen_some[] = {
+	[UCLOGIC_RDESC_PEN_PH_ID_X_LM] = 0xAA,
+	[UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0xBB,
+};
+
+static const s32 params_frame_all[UCLOGIC_RDESC_PH_ID_NUM] = {
+	[UCLOGIC_RDESC_FRAME_PH_ID_UM] = 0xFF,
+};
+
+static const __u8 template_empty[] = { };
+static const __u8 template_small[] = { 0x00 };
+static const __u8 template_no_ph[] = { 0xAA, 0xFE, 0xAA, 0xED, 0x1D };
+
+static const __u8 template_pen_ph_end[] = {
+	0xAA, 0xBB, UCLOGIC_RDESC_PEN_PH_HEAD
+};
+
+static const __u8 template_btn_ph_end[] = {
+	0xAA, 0xBB, UCLOGIC_RDESC_FRAME_PH_BTN_HEAD
+};
+
+static const __u8 template_pen_all_params[] = {
+	UCLOGIC_RDESC_PEN_PH(X_LM),
+	0x47, UCLOGIC_RDESC_PEN_PH(X_PM),
+	0x27, UCLOGIC_RDESC_PEN_PH(Y_LM),
+	UCLOGIC_RDESC_PEN_PH(Y_PM),
+	0x00, UCLOGIC_RDESC_PEN_PH(PRESSURE_LM),
+};
+
+static const __u8 expected_pen_all_params[] = {
+	0xAA, 0x00, 0x00, 0x00,
+	0x47, 0xBB, 0x00, 0x00, 0x00,
+	0x27, 0xCC, 0x00, 0x00, 0x00,
+	0xDD, 0x00, 0x00, 0x00,
+	0x00, 0xEE, 0x00, 0x00, 0x00,
+};
+
+static const __u8 template_frame_all_params[] = {
+	0x01, 0x02,
+	UCLOGIC_RDESC_FRAME_PH_BTN,
+	0x99,
+};
+
+static const __u8 expected_frame_all_params[] = {
+	0x01, 0x02,
+	0x2A, 0xFF, 0x00,
+	0x99,
+};
+
+static const __u8 template_pen_some_params[] = {
+	0x01, 0x02,
+	UCLOGIC_RDESC_PEN_PH(X_LM),
+	0x03, UCLOGIC_RDESC_PEN_PH(X_PM),
+	0x04, 0x05,
+};
+
+static const __u8 expected_pen_some_params[] = {
+	0x01, 0x02,
+	0xAA, 0x00, 0x00, 0x00,
+	0x03, 0xBB, 0x00, 0x00, 0x00,
+	0x04, 0x05,
+};
+
+static const __u8 template_params_none[] = {
+	0x27, UCLOGIC_RDESC_PEN_PH(Y_LM),
+	UCLOGIC_RDESC_PEN_PH(Y_PM),
+	0x00, UCLOGIC_RDESC_PEN_PH(PRESSURE_LM),
+};
+
+static struct uclogic_template_case uclogic_template_cases[] = {
+	{
+		.name = "Empty template",
+		.template = template_empty,
+		.template_size = sizeof(template_empty),
+		.param_list = params_pen_all,
+		.param_num = ARRAY_SIZE(params_pen_all),
+		.expected = template_empty,
+	},
+	{
+		.name = "Template smaller than the placeholder",
+		.template = template_small,
+		.template_size = sizeof(template_small),
+		.param_list = params_pen_all,
+		.param_num = ARRAY_SIZE(params_pen_all),
+		.expected = template_small,
+	},
+	{
+		.name = "No placeholder",
+		.template = template_no_ph,
+		.template_size = sizeof(template_no_ph),
+		.param_list = params_pen_all,
+		.param_num = ARRAY_SIZE(params_pen_all),
+		.expected = template_no_ph,
+	},
+	{
+		.name = "Pen placeholder at the end, without ID",
+		.template = template_pen_ph_end,
+		.template_size = sizeof(template_pen_ph_end),
+		.param_list = params_pen_all,
+		.param_num = ARRAY_SIZE(params_pen_all),
+		.expected = template_pen_ph_end,
+	},
+	{
+		.name = "Frame button placeholder at the end, without ID",
+		.template = template_btn_ph_end,
+		.template_size = sizeof(template_btn_ph_end),
+		.param_list = params_frame_all,
+		.param_num = ARRAY_SIZE(params_frame_all),
+		.expected = template_btn_ph_end,
+	},
+	{
+		.name = "All params present in the pen template",
+		.template = template_pen_all_params,
+		.template_size = sizeof(template_pen_all_params),
+		.param_list = params_pen_all,
+		.param_num = ARRAY_SIZE(params_pen_all),
+		.expected = expected_pen_all_params,
+	},
+	{
+		.name = "All params present in the frame template",
+		.template = template_frame_all_params,
+		.template_size = sizeof(template_frame_all_params),
+		.param_list = params_frame_all,
+		.param_num = ARRAY_SIZE(params_frame_all),
+		.expected = expected_frame_all_params,
+	},
+	{
+		.name = "Some params present in the pen template (complete param list)",
+		.template = template_pen_some_params,
+		.template_size = sizeof(template_pen_some_params),
+		.param_list = params_pen_all,
+		.param_num = ARRAY_SIZE(params_pen_all),
+		.expected = expected_pen_some_params,
+	},
+	{
+		.name = "Some params present in the pen template (incomplete param list)",
+		.template = template_pen_some_params,
+		.template_size = sizeof(template_pen_some_params),
+		.param_list = params_pen_some,
+		.param_num = ARRAY_SIZE(params_pen_some),
+		.expected = expected_pen_some_params,
+	},
+	{
+		.name = "No params present in the template",
+		.template = template_params_none,
+		.template_size = sizeof(template_params_none),
+		.param_list = params_pen_some,
+		.param_num = ARRAY_SIZE(params_pen_some),
+		.expected = template_params_none,
+	},
+};
+
+static void uclogic_template_case_desc(struct uclogic_template_case *t,
+				       char *desc)
+{
+	strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
+}
+
+KUNIT_ARRAY_PARAM(uclogic_template, uclogic_template_cases,
+		  uclogic_template_case_desc);
+
+static void uclogic_template_test(struct kunit *test)
+{
+	__u8 *res;
+	const struct uclogic_template_case *params = test->param_value;
+
+	res = uclogic_rdesc_template_apply(params->template,
+					   params->template_size,
+					   params->param_list,
+					   params->param_num);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, res);
+	KUNIT_EXPECT_EQ(test, 0,
+			memcmp(res, params->expected, params->template_size));
+	kfree(res);
+}
+
+static struct kunit_case hid_uclogic_rdesc_test_cases[] = {
+	KUNIT_CASE_PARAM(uclogic_template_test, uclogic_template_gen_params),
+	{}
+};
+
+static struct kunit_suite hid_uclogic_rdesc_test_suite = {
+	.name = "hid-uclogic-rdesc-test",
+	.test_cases = hid_uclogic_rdesc_test_cases,
+};
+
+kunit_test_suite(hid_uclogic_rdesc_test_suite);
+
+MODULE_DESCRIPTION("KUnit tests for the UC-Logic driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("José Expósito <[e-mail]>");

drivers/hid/hid-uclogic-rdesc.c

···
 const size_t uclogic_rdesc_v2_frame_dial_size =
 			sizeof(uclogic_rdesc_v2_frame_dial_arr);
 
+/* Fixed report descriptor template for UGEE v2 pen reports */
+const __u8 uclogic_rdesc_ugee_v2_pen_template_arr[] = {
+	0x05, 0x0d,         /*  Usage Page (Digitizers),                */
+	0x09, 0x01,         /*  Usage (Digitizer),                      */
+	0xa1, 0x01,         /*  Collection (Application),               */
+	0x85, 0x02,         /*      Report ID (2),                      */
+	0x09, 0x20,         /*      Usage (Stylus),                     */
+	0xa1, 0x00,         /*      Collection (Physical),              */
+	0x09, 0x42,         /*          Usage (Tip Switch),             */
+	0x09, 0x44,         /*          Usage (Barrel Switch),          */
+	0x09, 0x46,         /*          Usage (Tablet Pick),            */
+	0x75, 0x01,         /*          Report Size (1),                */
+	0x95, 0x03,         /*          Report Count (3),               */
+	0x14,               /*          Logical Minimum (0),            */
+	0x25, 0x01,         /*          Logical Maximum (1),            */
+	0x81, 0x02,         /*          Input (Variable),               */
+	0x95, 0x02,         /*          Report Count (2),               */
+	0x81, 0x03,         /*          Input (Constant, Variable),     */
+	0x09, 0x32,         /*          Usage (In Range),               */
+	0x95, 0x01,         /*          Report Count (1),               */
+	0x81, 0x02,         /*          Input (Variable),               */
+	0x95, 0x02,         /*          Report Count (2),               */
+	0x81, 0x03,         /*          Input (Constant, Variable),     */
+	0x75, 0x10,         /*          Report Size (16),               */
+	0x95, 0x01,         /*          Report Count (1),               */
+	0x35, 0x00,         /*          Physical Minimum (0),           */
+	0xa4,               /*          Push,                           */
+	0x05, 0x01,         /*          Usage Page (Desktop),           */
+	0x09, 0x30,         /*          Usage (X),                      */
+	0x65, 0x13,         /*          Unit (Inch),                    */
+	0x55, 0x0d,         /*          Unit Exponent (-3),             */
+	0x27, UCLOGIC_RDESC_PEN_PH(X_LM),
+			    /*          Logical Maximum (PLACEHOLDER),  */
+	0x47, UCLOGIC_RDESC_PEN_PH(X_PM),
+			    /*          Physical Maximum (PLACEHOLDER), */
+	0x81, 0x02,         /*          Input (Variable),               */
+	0x09, 0x31,         /*          Usage (Y),                      */
+	0x27, UCLOGIC_RDESC_PEN_PH(Y_LM),
+			    /*          Logical Maximum (PLACEHOLDER),  */
+	0x47, UCLOGIC_RDESC_PEN_PH(Y_PM),
+			    /*          Physical Maximum (PLACEHOLDER), */
+	0x81, 0x02,         /*          Input (Variable),               */
+	0xb4,               /*          Pop,                            */
+	0x09, 0x30,         /*          Usage (Tip Pressure),           */
+	0x45, 0x00,         /*          Physical Maximum (0),           */
+	0x27, UCLOGIC_RDESC_PEN_PH(PRESSURE_LM),
+			    /*          Logical Maximum (PLACEHOLDER),  */
+	0x75, 0x0D,         /*          Report Size (13),               */
+	0x95, 0x01,         /*          Report Count (1),               */
+	0x81, 0x02,         /*          Input (Variable),               */
+	0x75, 0x01,         /*          Report Size (1),                */
+	0x95, 0x03,         /*          Report Count (3),               */
+	0x81, 0x01,         /*          Input (Constant),               */
+	0x09, 0x3d,         /*          Usage (X Tilt),                 */
+	0x35, 0xC3,         /*          Physical Minimum (-61),         */
+	0x45, 0x3C,         /*          Physical Maximum (60),          */
+	0x15, 0xC3,         /*          Logical Minimum (-61),          */
+	0x25, 0x3C,         /*          Logical Maximum (60),           */
+	0x75, 0x08,         /*          Report Size (8),                */
+	0x95, 0x01,         /*          Report Count (1),               */
+	0x81, 0x02,         /*          Input (Variable),               */
+	0x09, 0x3e,         /*          Usage (Y Tilt),                 */
+	0x35, 0xC3,         /*          Physical Minimum (-61),         */
+	0x45, 0x3C,         /*          Physical Maximum (60),          */
+	0x15, 0xC3,         /*          Logical Minimum (-61),          */
+	0x25, 0x3C,         /*          Logical Maximum (60),           */
+	0x81, 0x02,         /*          Input (Variable),               */
+	0xc0,               /*      End Collection,                     */
+	0xc0,               /*  End Collection                          */
+};
+const size_t uclogic_rdesc_ugee_v2_pen_template_size =
+			sizeof(uclogic_rdesc_ugee_v2_pen_template_arr);
+
+/* Fixed report descriptor template for UGEE v2 frame reports (buttons only) */
+const __u8 uclogic_rdesc_ugee_v2_frame_btn_template_arr[] = {
+	0x05, 0x01,         /*  Usage Page (Desktop),                   */
+	0x09, 0x07,         /*  Usage (Keypad),                         */
+	0xA1, 0x01,         /*  Collection (Application),               */
+	0x85, UCLOGIC_RDESC_V1_FRAME_ID,
+			    /*      Report ID,                          */
+	0x05, 0x0D,         /*      Usage Page (Digitizer),             */
+	0x09, 0x39,         /*      Usage (Tablet Function Keys),       */
+	0xA0,               /*      Collection (Physical),              */
+	0x75, 0x01,         /*          Report Size (1),                */
+	0x95, 0x08,         /*          Report Count (8),               */
+	0x81, 0x01,         /*          Input (Constant),               */
+	0x05, 0x09,         /*          Usage Page (Button),            */
+	0x19, 0x01,         /*          Usage Minimum (01h),            */
+	UCLOGIC_RDESC_FRAME_PH_BTN,
+			    /*          Usage Maximum (PLACEHOLDER),    */
+	0x95, 0x0A,         /*          Report Count (10),              */
+	0x14,               /*          Logical Minimum (0),            */
+	0x25, 0x01,         /*          Logical Maximum (1),            */
+	0x81, 0x02,         /*          Input (Variable),               */
+	0x95, 0x46,         /*          Report Count (70),              */
+	0x81, 0x01,         /*          Input (Constant),               */
+	0xC0,               /*      End Collection,                     */
+	0xC0                /*  End Collection                          */
+};
+const size_t uclogic_rdesc_ugee_v2_frame_btn_template_size =
+			sizeof(uclogic_rdesc_ugee_v2_frame_btn_template_arr);
+
 /* Fixed report descriptor for Ugee EX07 frame */
 const __u8 uclogic_rdesc_ugee_ex07_frame_arr[] = {
 	0x05, 0x01,             /*  Usage Page (Desktop),                   */
···
  * uclogic_rdesc_template_apply() - apply report descriptor parameters to a
  * report descriptor template, creating a report descriptor. Copies the
  * template over to the new report descriptor and replaces every occurrence of
- * UCLOGIC_RDESC_PH_HEAD, followed by an index byte, with the value from the
+ * the template placeholders, followed by an index byte, with the value from the
  * parameter list at that index.
  *
  * @template_ptr:	Pointer to the template buffer.
···
 				   const s32 *param_list,
 				   size_t param_num)
 {
-	static const __u8 head[] = {UCLOGIC_RDESC_PH_HEAD};
+	static const __u8 btn_head[] = {UCLOGIC_RDESC_FRAME_PH_BTN_HEAD};
+	static const __u8 pen_head[] = {UCLOGIC_RDESC_PEN_PH_HEAD};
 	__u8 *rdesc_ptr;
 	__u8 *p;
 	s32 v;
···
 	if (rdesc_ptr == NULL)
 		return NULL;
 
-	for (p = rdesc_ptr; p + sizeof(head) < rdesc_ptr + template_size;) {
-		if (memcmp(p, head, sizeof(head)) == 0 &&
-		    p[sizeof(head)] < param_num) {
-			v = param_list[p[sizeof(head)]];
+	for (p = rdesc_ptr; p + sizeof(btn_head) < rdesc_ptr + template_size;) {
+		if (p + sizeof(pen_head) < rdesc_ptr + template_size &&
+		    memcmp(p, pen_head, sizeof(pen_head)) == 0 &&
+		    p[sizeof(pen_head)] < param_num) {
+			v = param_list[p[sizeof(pen_head)]];
 			put_unaligned(cpu_to_le32(v), (s32 *)p);
-			p += sizeof(head) + 1;
+			p += sizeof(pen_head) + 1;
+		} else if (memcmp(p, btn_head, sizeof(btn_head)) == 0 &&
+			   p[sizeof(btn_head)] < param_num) {
+			v = param_list[p[sizeof(btn_head)]];
+			put_unaligned((__u8)0x2A, p); /* Usage Maximum */
+			put_unaligned_le16((__force u16)cpu_to_le16(v), p + 1);
+			p += sizeof(btn_head) + 1;
 		} else {
 			p++;
 		}

drivers/hid/hid-uclogic-rdesc.h

···
 extern const size_t uclogic_rdesc_twha60_fixed1_size;
 
 /* Report descriptor template placeholder head */
-#define UCLOGIC_RDESC_PH_HEAD	0xFE, 0xED, 0x1D
+#define UCLOGIC_RDESC_PEN_PH_HEAD	0xFE, 0xED, 0x1D
+#define UCLOGIC_RDESC_FRAME_PH_BTN_HEAD	0xFE, 0xED
 
 /* Apply report descriptor parameters to a report descriptor template */
 extern __u8 *uclogic_rdesc_template_apply(const __u8 *template_ptr,
···
 					  const s32 *param_list,
 					  size_t param_num);
 
-/* Pen report descriptor template placeholder IDs */
-enum uclogic_rdesc_pen_ph_id {
+/* Report descriptor template placeholder IDs */
+enum uclogic_rdesc_ph_id {
 	UCLOGIC_RDESC_PEN_PH_ID_X_LM,
 	UCLOGIC_RDESC_PEN_PH_ID_X_PM,
 	UCLOGIC_RDESC_PEN_PH_ID_Y_LM,
 	UCLOGIC_RDESC_PEN_PH_ID_Y_PM,
 	UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM,
-	UCLOGIC_RDESC_PEN_PH_ID_NUM
+	UCLOGIC_RDESC_FRAME_PH_ID_UM,
+	UCLOGIC_RDESC_PH_ID_NUM
 };
 
 /* Report descriptor pen template placeholder */
 #define UCLOGIC_RDESC_PEN_PH(_ID) \
-	UCLOGIC_RDESC_PH_HEAD, UCLOGIC_RDESC_PEN_PH_ID_##_ID
+	UCLOGIC_RDESC_PEN_PH_HEAD, UCLOGIC_RDESC_PEN_PH_ID_##_ID
+
+/* Report descriptor frame buttons template placeholder */
+#define UCLOGIC_RDESC_FRAME_PH_BTN \
+	UCLOGIC_RDESC_FRAME_PH_BTN_HEAD, UCLOGIC_RDESC_FRAME_PH_ID_UM
 
 /* Report ID for v1 pen reports */
 #define UCLOGIC_RDESC_V1_PEN_ID	0x07
···
 
 /* Device ID byte offset in v2 frame dial reports */
 #define UCLOGIC_RDESC_V2_FRAME_DIAL_DEV_ID_BYTE	0x4
+
+/* Fixed report descriptor template for UGEE v2 pen reports */
+extern const __u8 uclogic_rdesc_ugee_v2_pen_template_arr[];
+extern const size_t uclogic_rdesc_ugee_v2_pen_template_size;
+
+/* Fixed report descriptor template for UGEE v2 frame reports (buttons only) */
+extern const __u8 uclogic_rdesc_ugee_v2_frame_btn_template_arr[];
+extern const size_t uclogic_rdesc_ugee_v2_frame_btn_template_size;
 
 /* Fixed report descriptor for Ugee EX07 frame */
 extern const __u8 uclogic_rdesc_ugee_ex07_frame_arr[];

drivers/hid/i2c-hid/Kconfig

···
 	  will be called i2c-hid-of.  It will also build/depend on the
 	  module i2c-hid.
 
+config I2C_HID_OF_ELAN
+	tristate "Driver for Elan hid-i2c based devices on OF systems"
+	default n
+	depends on I2C && INPUT && OF
+	help
+	  Say Y here if you want support for Elan i2c devices that use
+	  the i2c-hid protocol on Open Firmware (Device Tree)-based
+	  systems.
+
+	  If unsure, say N.
+
+	  This support is also available as a module.  If so, the module
+	  will be called i2c-hid-of-elan.  It will also build/depend on
+	  the module i2c-hid.
+
 config I2C_HID_OF_GOODIX
 	tristate "Driver for Goodix hid-i2c based devices on OF systems"
 	default n

drivers/hid/i2c-hid/Makefile

···
 
 obj-$(CONFIG_I2C_HID_ACPI)			+= i2c-hid-acpi.o
 obj-$(CONFIG_I2C_HID_OF)			+= i2c-hid-of.o
+obj-$(CONFIG_I2C_HID_OF_ELAN)			+= i2c-hid-of-elan.o
 obj-$(CONFIG_I2C_HID_OF_GOODIX)			+= i2c-hid-of-goodix.o

drivers/hid/i2c-hid/i2c-hid-of-elan.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Elan touchscreens that use the i2c-hid protocol.
+ *
+ * Copyright 2020 Google LLC
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+
+#include "i2c-hid.h"
+
+struct elan_i2c_hid_chip_data {
+	unsigned int post_gpio_reset_delay_ms;
+	unsigned int post_power_delay_ms;
+	u16 hid_descriptor_address;
+};
+
+struct i2c_hid_of_elan {
+	struct i2chid_ops ops;
+
+	struct regulator *vcc33;
+	struct regulator *vccio;
+	struct gpio_desc *reset_gpio;
+	const struct elan_i2c_hid_chip_data *chip_data;
+};
+
+static int elan_i2c_hid_power_up(struct i2chid_ops *ops)
+{
+	struct i2c_hid_of_elan *ihid_elan =
+		container_of(ops, struct i2c_hid_of_elan, ops);
+	int ret;
+
+	ret = regulator_enable(ihid_elan->vcc33);
+	if (ret)
+		return ret;
+
+	ret = regulator_enable(ihid_elan->vccio);
+	if (ret) {
+		regulator_disable(ihid_elan->vcc33);
+		return ret;
+	}
+
+	if (ihid_elan->chip_data->post_power_delay_ms)
+		msleep(ihid_elan->chip_data->post_power_delay_ms);
+
+	gpiod_set_value_cansleep(ihid_elan->reset_gpio, 0);
+	if (ihid_elan->chip_data->post_gpio_reset_delay_ms)
+		msleep(ihid_elan->chip_data->post_gpio_reset_delay_ms);
+
+	return 0;
+}
+
+static void elan_i2c_hid_power_down(struct i2chid_ops *ops)
+{
+	struct i2c_hid_of_elan *ihid_elan =
+		container_of(ops, struct i2c_hid_of_elan, ops);
+
+	gpiod_set_value_cansleep(ihid_elan->reset_gpio, 1);
+	regulator_disable(ihid_elan->vccio);
+	regulator_disable(ihid_elan->vcc33);
+}
+
+static int i2c_hid_of_elan_probe(struct i2c_client *client,
+				 const struct i2c_device_id *id)
+{
+	struct i2c_hid_of_elan *ihid_elan;
+
+	ihid_elan = devm_kzalloc(&client->dev, sizeof(*ihid_elan), GFP_KERNEL);
+	if (!ihid_elan)
+		return -ENOMEM;
+
+	ihid_elan->ops.power_up = elan_i2c_hid_power_up;
+	ihid_elan->ops.power_down = elan_i2c_hid_power_down;
+
+	/* Start out with reset asserted */
+	ihid_elan->reset_gpio =
+		devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ihid_elan->reset_gpio))
+		return PTR_ERR(ihid_elan->reset_gpio);
+
+	ihid_elan->vccio = devm_regulator_get(&client->dev, "vccio");
+	if (IS_ERR(ihid_elan->vccio))
+		return PTR_ERR(ihid_elan->vccio);
+
+	ihid_elan->vcc33 = devm_regulator_get(&client->dev, "vcc33");
+	if (IS_ERR(ihid_elan->vcc33))
+		return PTR_ERR(ihid_elan->vcc33);
+
+	ihid_elan->chip_data = device_get_match_data(&client->dev);
+
+	return i2c_hid_core_probe(client, &ihid_elan->ops,
+				  ihid_elan->chip_data->hid_descriptor_address, 0);
+}
+
+static const struct elan_i2c_hid_chip_data elan_ekth6915_chip_data = {
+	.post_power_delay_ms = 1,
+	.post_gpio_reset_delay_ms = 300,
+	.hid_descriptor_address = 0x0001,
+};
+
+static const struct of_device_id elan_i2c_hid_of_match[] = {
+	{ .compatible = "elan,ekth6915", .data = &elan_ekth6915_chip_data },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, elan_i2c_hid_of_match);
+
+static struct i2c_driver elan_i2c_hid_ts_driver = {
+	.driver = {
+		.name	= "i2c_hid_of_elan",
+		.pm	= &i2c_hid_core_pm,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.of_match_table = of_match_ptr(elan_i2c_hid_of_match),
+	},
+	.probe		= i2c_hid_of_elan_probe,
+	.remove		= i2c_hid_core_remove,
+	.shutdown	= i2c_hid_core_shutdown,
+};
+module_i2c_driver(elan_i2c_hid_ts_driver);
+
+MODULE_AUTHOR("Douglas Anderson <[e-mail]>");
+MODULE_DESCRIPTION("Elan i2c-hid touchscreen driver");
+MODULE_LICENSE("GPL");

drivers/hid/intel-ish-hid/ipc/ipc.c

···
 	static unsigned long	prev_sync;
 	uint64_t	usec;
 
-	if (prev_sync && jiffies - prev_sync < 20 * HZ)
+	if (prev_sync && time_before(jiffies, prev_sync + 20 * HZ))
 		return;
 
 	prev_sync = jiffies;

drivers/hid/intel-ish-hid/ishtp-hid-client.c

···
 
 /**
  * ish_cl_event_cb() - bus driver callback for incoming message/packet
- * @device:	Pointer to the the ishtp client device for which this message
+ * @device:	Pointer to the ishtp client device for which this message
  *		is targeted
  *
  * Remove the packet from the list and process the message by calling

drivers/hid/wacom.h

···
 #include <linux/leds.h>
 #include <linux/usb/input.h>
 #include <linux/power_supply.h>
+#include <linux/timer.h>
 #include <asm/unaligned.h>
 
 /*
···
 	struct delayed_work init_work;
 	struct wacom_remote *remote;
 	struct work_struct mode_change_work;
+	struct timer_list idleprox_timer;
 	bool generic_has_leds;
 	struct wacom_leds {
 		struct wacom_group_leds *groups;
···
 struct wacom_led *wacom_led_next(struct wacom *wacom, struct wacom_led *cur);
 int wacom_equivalent_usage(int usage);
 int wacom_initialize_leds(struct wacom *wacom);
+void wacom_idleprox_timeout(struct timer_list *list);
 #endif

drivers/hid/wacom_sys.c

···
 
 	error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
 	if (error) {
-		/* no pad in use on this interface */
+		/* no pad events using this interface */
 		input_free_device(pad_input_dev);
 		wacom_wac->pad_input = NULL;
 		pad_input_dev = NULL;
···
 	INIT_WORK(&wacom->battery_work, wacom_battery_work);
 	INIT_WORK(&wacom->remote_work, wacom_remote_work);
 	INIT_WORK(&wacom->mode_change_work, wacom_mode_change_work);
+	timer_setup(&wacom->idleprox_timer, &wacom_idleprox_timeout, TIMER_DEFERRABLE);
 
 	/* ask for the report descriptor to be loaded by HID */
 	error = hid_parse(hdev);
···
 	cancel_work_sync(&wacom->battery_work);
 	cancel_work_sync(&wacom->remote_work);
 	cancel_work_sync(&wacom->mode_change_work);
+	del_timer_sync(&wacom->idleprox_timer);
 	if (hdev->bus == BUS_BLUETOOTH)
 		device_remove_file(&hdev->dev, &dev_attr_speed);
 

drivers/hid/wacom_wac.c

···
 #include "wacom_wac.h"
 #include "wacom.h"
 #include <linux/input/mt.h>
+#include <linux/jiffies.h>
 
 /* resolution for penabled devices */
 #define WACOM_PL_RES		20
···
 
 static void wacom_update_led(struct wacom *wacom, int button_count, int mask,
 			     int group);
+
+static void wacom_force_proxout(struct wacom_wac *wacom_wac)
+{
+	struct input_dev *input = wacom_wac->pen_input;
+
+	wacom_wac->shared->stylus_in_proximity = 0;
+
+	input_report_key(input, BTN_TOUCH, 0);
+	input_report_key(input, BTN_STYLUS, 0);
+	input_report_key(input, BTN_STYLUS2, 0);
+	input_report_key(input, BTN_STYLUS3, 0);
+	input_report_key(input, wacom_wac->tool[0], 0);
+	if (wacom_wac->serial[0]) {
+		input_report_abs(input, ABS_MISC, 0);
+	}
+	input_report_abs(input, ABS_PRESSURE, 0);
+
+	wacom_wac->tool[0] = 0;
+	wacom_wac->id[0] = 0;
+	wacom_wac->serial[0] = 0;
+
+	input_sync(input);
+}
+
+void wacom_idleprox_timeout(struct timer_list *list)
+{
+	struct wacom *wacom = from_timer(wacom, list, idleprox_timer);
+	struct wacom_wac *wacom_wac = &wacom->wacom_wac;
+
+	if (!wacom_wac->hid_data.sense_state) {
+		return;
+	}
+
+	hid_warn(wacom->hdev, "%s: tool appears to be hung in-prox. forcing it out.\n", __func__);
+	wacom_force_proxout(wacom_wac);
+}
+
 /*
  * Percent of battery capacity for Graphire.
  * 8th value means AC online and show 100% capacity.
···
 	return (tool_id & ~0xFFF) << 4 | (tool_id & 0xFFF);
 }
 
+static bool wacom_is_art_pen(int tool_id)
+{
+	bool is_art_pen = false;
+
+	switch (tool_id) {
+	case 0x885:	/* Intuos3 Marker Pen */
+	case 0x804:	/* Intuos4/5 13HD/24HD Marker Pen */
+	case 0x10804:	/* Intuos4/5 13HD/24HD Art Pen */
+		is_art_pen = true;
+		break;
+	}
+	return is_art_pen;
+}
+
 static int wacom_intuos_get_tool_type(int tool_id)
 {
-	int tool_type;
+	int tool_type = BTN_TOOL_PEN;
+
+	if (wacom_is_art_pen(tool_id))
+		return tool_type;
 
 	switch (tool_id) {
 	case 0x812: /* Inking pen */
···
 	case 0x852:
 	case 0x823: /* Intuos3 Grip Pen */
 	case 0x813: /* Intuos3 Classic Pen */
-	case 0x885: /* Intuos3 Marker Pen */
 	case 0x802: /* Intuos4/5 13HD/24HD General Pen */
-	case 0x804: /* Intuos4/5 13HD/24HD Marker Pen */
 	case 0x8e2: /* IntuosHT2 pen */
 	case 0x022:
-	case 0x10804: /* Intuos4/5 13HD/24HD Art Pen */
 	case 0x10842: /* MobileStudio Pro Pro Pen slim */
 	case 0x14802: /* Intuos4/5 13HD/24HD Classic Pen */
 	case 0x16802: /* Cintiq 13HD Pro Pen */
···
 	case 0x902: /* Intuos4/5 13HD/24HD Airbrush */
 	case 0x10902: /* Intuos4/5 13HD/24HD Airbrush */
 		tool_type = BTN_TOOL_AIRBRUSH;
-		break;
-
-	default: /* Unknown tool */
-		tool_type = BTN_TOOL_PEN;
 		break;
 	}
 	return tool_type;
···
 		wacom_wac->has_mute_touch_switch = true;
 		usage->type = EV_SW;
 		usage->code = SW_MUTE_DEVICE;
-		features->device_type |= WACOM_DEVICETYPE_PAD;
 		break;
 	case WACOM_HID_WD_TOUCHSTRIP:
 		wacom_map_usage(input, usage, field, EV_ABS, ABS_RX, 0);
···
 			wacom_wac->hid_data.inrange_state |= value;
 	}
 
+	/* Process touch switch state first since it is reported through touch interface,
+	 * which is indepentent of pad interface. In the case when there are no other pad
+	 * events, the pad interface will not even be created.
+	 */
+	if ((equivalent_usage == WACOM_HID_WD_MUTE_DEVICE) ||
+	   (equivalent_usage == WACOM_HID_WD_TOUCHONOFF)) {
+		if (wacom_wac->shared->touch_input) {
+			bool *is_touch_on = &wacom_wac->shared->is_touch_on;
+
+			if (equivalent_usage == WACOM_HID_WD_MUTE_DEVICE && value)
+				*is_touch_on = !(*is_touch_on);
+			else if (equivalent_usage == WACOM_HID_WD_TOUCHONOFF)
+				*is_touch_on = value;
+
+			input_report_switch(wacom_wac->shared->touch_input,
+					    SW_MUTE_DEVICE, !(*is_touch_on));
+			input_sync(wacom_wac->shared->touch_input);
+		}
+		return;
+	}
+
+	if (!input)
+		return;
+
 	switch (equivalent_usage) {
 	case WACOM_HID_WD_TOUCHRING:
 		/*
···
 	case WACOM_HID_WD_TOUCHRINGSTATUS:
 		if (!value)
 			input_event(input, usage->type, usage->code, 0);
-		break;
-
-	case WACOM_HID_WD_MUTE_DEVICE:
-	case WACOM_HID_WD_TOUCHONOFF:
-		if (wacom_wac->shared->touch_input) {
-			bool *is_touch_on = &wacom_wac->shared->is_touch_on;
-
-			if (equivalent_usage == WACOM_HID_WD_MUTE_DEVICE && value)
-				*is_touch_on = !(*is_touch_on);
-			else if (equivalent_usage == WACOM_HID_WD_TOUCHONOFF)
-				*is_touch_on = value;
-
-			input_report_switch(wacom_wac->shared->touch_input,
-					    SW_MUTE_DEVICE, !(*is_touch_on));
-			input_sync(wacom_wac->shared->touch_input);
-		}
 		break;
 
 	case WACOM_HID_WD_MODE_CHANGE:
···
 		value = field->logical_maximum - value;
 		break;
 	case HID_DG_INRANGE:
+		mod_timer(&wacom->idleprox_timer, jiffies + msecs_to_jiffies(100));
 		wacom_wac->hid_data.inrange_state = value;
 		if (!(features->quirks & WACOM_QUIRK_SENSE))
 			wacom_wac->hid_data.sense_state = value;
···
 		}
 		return;
 	case HID_DG_TWIST:
+		/* don't modify the value if the pen doesn't support the feature */
+		if (!wacom_is_art_pen(wacom_wac->id[0])) return;
+
 		/*
 		 * Userspace expects pen twist to have its zero point when
 		 * the buttons/finger is on the tablet's left. HID values
···
 	/* usage tests must precede field tests */
 	if (WACOM_BATTERY_USAGE(usage))
 		wacom_wac_battery_event(hdev, field, usage, value);
-	else if (WACOM_PAD_FIELD(field) && wacom->wacom_wac.pad_input)
+	else if (WACOM_PAD_FIELD(field))
 		wacom_wac_pad_event(hdev, field, usage, value);
 	else if (WACOM_PEN_FIELD(field) && wacom->wacom_wac.pen_input)
 		wacom_wac_pen_event(hdev, field, usage, value);