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From 9ee3e06610fdb8a601cde59c92089fb6c1deb4aa Mon Sep 17 00:00:00 2001
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From: Julian Sax <jsbc@gmx.de>
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Date: Wed, 19 Sep 2018 11:46:23 +0200
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Subject: [PATCH] HID: i2c-hid: override HID descriptors for certain devices
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A particular touchpad (SIPODEV SP1064) refuses to supply the HID
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descriptors. This patch provides the framework for overriding these
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descriptors based on DMI data. It also includes the descriptors for
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said touchpad, which were extracted by listening to the traffic of the
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windows filter driver, as well as the DMI data for the laptops known
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to use this device.
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Relevant Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1526312
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Cc: Hans de Goede <hdegoede@redhat.com>
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Reported-and-tested-by: ahormann@gmx.net
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Reported-and-tested-by: Bruno Jesus <bruno.fl.jesus@gmail.com>
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Reported-and-tested-by: Dietrich <enaut.w@googlemail.com>
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Reported-and-tested-by: kloxdami@yahoo.com
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Signed-off-by: Julian Sax <jsbc@gmx.de>
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Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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---
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 drivers/hid/i2c-hid/Makefile                  |   3 +
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 .../hid/i2c-hid/{i2c-hid.c => i2c-hid-core.c} |  60 ++-
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 drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c      | 376 ++++++++++++++++++
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 drivers/hid/i2c-hid/i2c-hid.h                 |  20 +
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 4 files changed, 439 insertions(+), 20 deletions(-)
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 rename drivers/hid/i2c-hid/{i2c-hid.c => i2c-hid-core.c} (96%)
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 create mode 100644 drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c
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 create mode 100644 drivers/hid/i2c-hid/i2c-hid.h
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diff --git a/drivers/hid/i2c-hid/Makefile b/drivers/hid/i2c-hid/Makefile
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index 832d8f9aaba2..099e1ce2f234 100644
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--- a/drivers/hid/i2c-hid/Makefile
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+++ b/drivers/hid/i2c-hid/Makefile
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@@ -3,3 +3,6 @@
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 #
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 obj-$(CONFIG_I2C_HID)				+= i2c-hid.o
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+
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+i2c-hid-objs					=  i2c-hid-core.o
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+i2c-hid-$(CONFIG_DMI)				+= i2c-hid-dmi-quirks.o
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diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid-core.c
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similarity index 96%
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rename from drivers/hid/i2c-hid/i2c-hid.c
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rename to drivers/hid/i2c-hid/i2c-hid-core.c
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index f3076659361a..823c63ad08b1 100644
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--- a/drivers/hid/i2c-hid/i2c-hid.c
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+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
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@@ -43,6 +43,7 @@
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 #include <linux/platform_data/i2c-hid.h>
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 #include "../hid-ids.h"
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+#include "i2c-hid.h"
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 /* quirks to control the device */
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 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV	BIT(0)
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@@ -669,6 +670,7 @@ static int i2c_hid_parse(struct hid_device *hid)
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 	char *rdesc;
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 	int ret;
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 	int tries = 3;
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+	char *use_override;
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 	i2c_hid_dbg(ihid, "entering %s\n", __func__);
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@@ -687,26 +689,37 @@ static int i2c_hid_parse(struct hid_device *hid)
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 	if (ret)
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 		return ret;
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-	rdesc = kzalloc(rsize, GFP_KERNEL);
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+	use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
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+								&rsize);
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-	if (!rdesc) {
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-		dbg_hid("couldn't allocate rdesc memory\n");
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-		return -ENOMEM;
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-	}
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-
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-	i2c_hid_dbg(ihid, "asking HID report descriptor\n");
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-
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-	ret = i2c_hid_command(client, &hid_report_descr_cmd, rdesc, rsize);
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-	if (ret) {
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-		hid_err(hid, "reading report descriptor failed\n");
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-		kfree(rdesc);
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-		return -EIO;
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+	if (use_override) {
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+		rdesc = use_override;
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+		i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
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+	} else {
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+		rdesc = kzalloc(rsize, GFP_KERNEL);
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+
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+		if (!rdesc) {
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+			dbg_hid("couldn't allocate rdesc memory\n");
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+			return -ENOMEM;
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+		}
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+
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+		i2c_hid_dbg(ihid, "asking HID report descriptor\n");
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+
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+		ret = i2c_hid_command(client, &hid_report_descr_cmd,
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+				      rdesc, rsize);
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+		if (ret) {
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+			hid_err(hid, "reading report descriptor failed\n");
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+			kfree(rdesc);
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+			return -EIO;
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+		}
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 	}
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 	i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
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 	ret = hid_parse_report(hid, rdesc, rsize);
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-	kfree(rdesc);
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+	if (!use_override)
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+		kfree(rdesc);
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+
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 	if (ret) {
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 		dbg_hid("parsing report descriptor failed\n");
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 		return ret;
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@@ -833,12 +846,19 @@ static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
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 	int ret;
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 	/* i2c hid fetch using a fixed descriptor size (30 bytes) */
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-	i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
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-	ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer,
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-				sizeof(struct i2c_hid_desc));
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-	if (ret) {
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-		dev_err(&client->dev, "hid_descr_cmd failed\n");
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-		return -ENODEV;
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+	if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
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+		i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
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+		ihid->hdesc =
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+			*i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
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+	} else {
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+		i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
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+		ret = i2c_hid_command(client, &hid_descr_cmd,
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+				      ihid->hdesc_buffer,
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+				      sizeof(struct i2c_hid_desc));
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+		if (ret) {
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+			dev_err(&client->dev, "hid_descr_cmd failed\n");
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+			return -ENODEV;
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+		}
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 	}
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 	/* Validate the length of HID descriptor, the 4 first bytes:
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diff --git a/drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c b/drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c
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new file mode 100644
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index 000000000000..1d645c9ab417
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--- /dev/null
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+++ b/drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c
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@@ -0,0 +1,385 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+
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+/*
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+ * Quirks for I2C-HID devices that do not supply proper descriptors
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+ *
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+ * Copyright (c) 2018 Julian Sax <jsbc@gmx.de>
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+ *
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+ */
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+
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+#include <linux/types.h>
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+#include <linux/dmi.h>
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+#include <linux/mod_devicetable.h>
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+
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+#include "i2c-hid.h"
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+
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+
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+struct i2c_hid_desc_override {
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+	union {
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+		struct i2c_hid_desc *i2c_hid_desc;
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+		uint8_t             *i2c_hid_desc_buffer;
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+	};
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+	uint8_t              *hid_report_desc;
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+	unsigned int          hid_report_desc_size;
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+	uint8_t              *i2c_name;
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+};
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+
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+
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+/*
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+ * descriptors for the SIPODEV SP1064 touchpad
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+ *
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+ * This device does not supply any descriptors and on windows a filter
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+ * driver operates between the i2c-hid layer and the device and injects
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+ * these descriptors when the device is prompted. The descriptors were
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+ * extracted by listening to the i2c-hid traffic that occurs between the
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+ * windows filter driver and the windows i2c-hid driver.
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+ */
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+
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+static const struct i2c_hid_desc_override sipodev_desc = {
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+	.i2c_hid_desc_buffer = (uint8_t [])
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+	{0x1e, 0x00,                  /* Length of descriptor                 */
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+	 0x00, 0x01,                  /* Version of descriptor                */
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+	 0xdb, 0x01,                  /* Length of report descriptor          */
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+	 0x21, 0x00,                  /* Location of report descriptor        */
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+	 0x24, 0x00,                  /* Location of input report             */
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+	 0x1b, 0x00,                  /* Max input report length              */
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+	 0x25, 0x00,                  /* Location of output report            */
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+	 0x11, 0x00,                  /* Max output report length             */
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+	 0x22, 0x00,                  /* Location of command register         */
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+	 0x23, 0x00,                  /* Location of data register            */
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+	 0x11, 0x09,                  /* Vendor ID                            */
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+	 0x88, 0x52,                  /* Product ID                           */
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+	 0x06, 0x00,                  /* Version ID                           */
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+	 0x00, 0x00, 0x00, 0x00       /* Reserved                             */
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+	},
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+
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+	.hid_report_desc = (uint8_t [])
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+	{0x05, 0x01,                  /* Usage Page (Desktop),                */
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+	 0x09, 0x02,                  /* Usage (Mouse),                       */
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+	 0xA1, 0x01,                  /* Collection (Application),            */
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+	 0x85, 0x01,                  /*     Report ID (1),                   */
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+	 0x09, 0x01,                  /*     Usage (Pointer),                 */
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+	 0xA1, 0x00,                  /*     Collection (Physical),           */
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+	 0x05, 0x09,                  /*         Usage Page (Button),         */
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+	 0x19, 0x01,                  /*         Usage Minimum (01h),         */
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+	 0x29, 0x02,                  /*         Usage Maximum (02h),         */
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+	 0x25, 0x01,                  /*         Logical Maximum (1),         */
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+	 0x75, 0x01,                  /*         Report Size (1),             */
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+	 0x95, 0x02,                  /*         Report Count (2),            */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x95, 0x06,                  /*         Report Count (6),            */
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+	 0x81, 0x01,                  /*         Input (Constant),            */
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+	 0x05, 0x01,                  /*         Usage Page (Desktop),        */
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+	 0x09, 0x30,                  /*         Usage (X),                   */
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+	 0x09, 0x31,                  /*         Usage (Y),                   */
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+	 0x15, 0x81,                  /*         Logical Minimum (-127),      */
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+	 0x25, 0x7F,                  /*         Logical Maximum (127),       */
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+	 0x75, 0x08,                  /*         Report Size (8),             */
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+	 0x95, 0x02,                  /*         Report Count (2),            */
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+	 0x81, 0x06,                  /*         Input (Variable, Relative),  */
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+	 0xC0,                        /*     End Collection,                  */
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+	 0xC0,                        /* End Collection,                      */
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+	 0x05, 0x0D,                  /* Usage Page (Digitizer),              */
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+	 0x09, 0x05,                  /* Usage (Touchpad),                    */
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+	 0xA1, 0x01,                  /* Collection (Application),            */
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+	 0x85, 0x04,                  /*     Report ID (4),                   */
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+	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
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+	 0x09, 0x22,                  /*     Usage (Finger),                  */
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+	 0xA1, 0x02,                  /*     Collection (Logical),            */
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+	 0x15, 0x00,                  /*         Logical Minimum (0),         */
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+	 0x25, 0x01,                  /*         Logical Maximum (1),         */
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+	 0x09, 0x47,                  /*         Usage (Touch Valid),         */
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+	 0x09, 0x42,                  /*         Usage (Tip Switch),          */
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+	 0x95, 0x02,                  /*         Report Count (2),            */
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+	 0x75, 0x01,                  /*         Report Size (1),             */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x95, 0x01,                  /*         Report Count (1),            */
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+	 0x75, 0x03,                  /*         Report Size (3),             */
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+	 0x25, 0x05,                  /*         Logical Maximum (5),         */
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+	 0x09, 0x51,                  /*         Usage (Contact Identifier),  */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x75, 0x01,                  /*         Report Size (1),             */
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+	 0x95, 0x03,                  /*         Report Count (3),            */
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+	 0x81, 0x03,                  /*         Input (Constant, Variable),  */
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+	 0x05, 0x01,                  /*         Usage Page (Desktop),        */
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+	 0x26, 0x44, 0x0A,            /*         Logical Maximum (2628),      */
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+	 0x75, 0x10,                  /*         Report Size (16),            */
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+	 0x55, 0x0E,                  /*         Unit Exponent (14),          */
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+	 0x65, 0x11,                  /*         Unit (Centimeter),           */
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+	 0x09, 0x30,                  /*         Usage (X),                   */
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+	 0x46, 0x1A, 0x04,            /*         Physical Maximum (1050),     */
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+	 0x95, 0x01,                  /*         Report Count (1),            */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x46, 0xBC, 0x02,            /*         Physical Maximum (700),      */
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+	 0x26, 0x34, 0x05,            /*         Logical Maximum (1332),      */
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+	 0x09, 0x31,                  /*         Usage (Y),                   */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0xC0,                        /*     End Collection,                  */
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+	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
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+	 0x09, 0x22,                  /*     Usage (Finger),                  */
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+	 0xA1, 0x02,                  /*     Collection (Logical),            */
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+	 0x25, 0x01,                  /*         Logical Maximum (1),         */
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+	 0x09, 0x47,                  /*         Usage (Touch Valid),         */
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+	 0x09, 0x42,                  /*         Usage (Tip Switch),          */
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+	 0x95, 0x02,                  /*         Report Count (2),            */
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+	 0x75, 0x01,                  /*         Report Size (1),             */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x95, 0x01,                  /*         Report Count (1),            */
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+	 0x75, 0x03,                  /*         Report Size (3),             */
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+	 0x25, 0x05,                  /*         Logical Maximum (5),         */
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+	 0x09, 0x51,                  /*         Usage (Contact Identifier),  */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x75, 0x01,                  /*         Report Size (1),             */
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+	 0x95, 0x03,                  /*         Report Count (3),            */
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+	 0x81, 0x03,                  /*         Input (Constant, Variable),  */
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+	 0x05, 0x01,                  /*         Usage Page (Desktop),        */
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+	 0x26, 0x44, 0x0A,            /*         Logical Maximum (2628),      */
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+	 0x75, 0x10,                  /*         Report Size (16),            */
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+	 0x09, 0x30,                  /*         Usage (X),                   */
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+	 0x46, 0x1A, 0x04,            /*         Physical Maximum (1050),     */
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+	 0x95, 0x01,                  /*         Report Count (1),            */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x46, 0xBC, 0x02,            /*         Physical Maximum (700),      */
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+	 0x26, 0x34, 0x05,            /*         Logical Maximum (1332),      */
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+	 0x09, 0x31,                  /*         Usage (Y),                   */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0xC0,                        /*     End Collection,                  */
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+	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
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+	 0x09, 0x22,                  /*     Usage (Finger),                  */
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+	 0xA1, 0x02,                  /*     Collection (Logical),            */
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+	 0x25, 0x01,                  /*         Logical Maximum (1),         */
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+	 0x09, 0x47,                  /*         Usage (Touch Valid),         */
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+	 0x09, 0x42,                  /*         Usage (Tip Switch),          */
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+	 0x95, 0x02,                  /*         Report Count (2),            */
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+	 0x75, 0x01,                  /*         Report Size (1),             */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x95, 0x01,                  /*         Report Count (1),            */
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+	 0x75, 0x03,                  /*         Report Size (3),             */
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+	 0x25, 0x05,                  /*         Logical Maximum (5),         */
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+	 0x09, 0x51,                  /*         Usage (Contact Identifier),  */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x75, 0x01,                  /*         Report Size (1),             */
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+	 0x95, 0x03,                  /*         Report Count (3),            */
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+	 0x81, 0x03,                  /*         Input (Constant, Variable),  */
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+	 0x05, 0x01,                  /*         Usage Page (Desktop),        */
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+	 0x26, 0x44, 0x0A,            /*         Logical Maximum (2628),      */
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+	 0x75, 0x10,                  /*         Report Size (16),            */
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+	 0x09, 0x30,                  /*         Usage (X),                   */
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+	 0x46, 0x1A, 0x04,            /*         Physical Maximum (1050),     */
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+	 0x95, 0x01,                  /*         Report Count (1),            */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x46, 0xBC, 0x02,            /*         Physical Maximum (700),      */
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+	 0x26, 0x34, 0x05,            /*         Logical Maximum (1332),      */
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+	 0x09, 0x31,                  /*         Usage (Y),                   */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0xC0,                        /*     End Collection,                  */
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+	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
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+	 0x09, 0x22,                  /*     Usage (Finger),                  */
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+	 0xA1, 0x02,                  /*     Collection (Logical),            */
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+	 0x25, 0x01,                  /*         Logical Maximum (1),         */
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+	 0x09, 0x47,                  /*         Usage (Touch Valid),         */
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+	 0x09, 0x42,                  /*         Usage (Tip Switch),          */
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+	 0x95, 0x02,                  /*         Report Count (2),            */
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+	 0x75, 0x01,                  /*         Report Size (1),             */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x95, 0x01,                  /*         Report Count (1),            */
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+	 0x75, 0x03,                  /*         Report Size (3),             */
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+	 0x25, 0x05,                  /*         Logical Maximum (5),         */
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+	 0x09, 0x51,                  /*         Usage (Contact Identifier),  */
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+	 0x81, 0x02,                  /*         Input (Variable),            */
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+	 0x75, 0x01,                  /*         Report Size (1),             */
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+	 0x95, 0x03,                  /*         Report Count (3),            */
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+	 0x81, 0x03,                  /*         Input (Constant, Variable),  */
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+	 0x05, 0x01,                  /*         Usage Page (Desktop),        */
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+	 0x26, 0x44, 0x0A,            /*         Logical Maximum (2628),      */
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+	 0x75, 0x10,                  /*         Report Size (16),            */
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+	 0x09, 0x30,                  /*         Usage (X),                   */
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+	 0x46, 0x1A, 0x04,            /*         Physical Maximum (1050),     */
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+	 0x95, 0x01,                  /*         Report Count (1),            */
e336be
+	 0x81, 0x02,                  /*         Input (Variable),            */
e336be
+	 0x46, 0xBC, 0x02,            /*         Physical Maximum (700),      */
e336be
+	 0x26, 0x34, 0x05,            /*         Logical Maximum (1332),      */
e336be
+	 0x09, 0x31,                  /*         Usage (Y),                   */
e336be
+	 0x81, 0x02,                  /*         Input (Variable),            */
e336be
+	 0xC0,                        /*     End Collection,                  */
e336be
+	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
e336be
+	 0x55, 0x0C,                  /*     Unit Exponent (12),              */
e336be
+	 0x66, 0x01, 0x10,            /*     Unit (Seconds),                  */
e336be
+	 0x47, 0xFF, 0xFF, 0x00, 0x00,/*     Physical Maximum (65535),        */
e336be
+	 0x27, 0xFF, 0xFF, 0x00, 0x00,/*     Logical Maximum (65535),         */
e336be
+	 0x75, 0x10,                  /*     Report Size (16),                */
e336be
+	 0x95, 0x01,                  /*     Report Count (1),                */
e336be
+	 0x09, 0x56,                  /*     Usage (Scan Time),               */
e336be
+	 0x81, 0x02,                  /*     Input (Variable),                */
e336be
+	 0x09, 0x54,                  /*     Usage (Contact Count),           */
e336be
+	 0x25, 0x7F,                  /*     Logical Maximum (127),           */
e336be
+	 0x75, 0x08,                  /*     Report Size (8),                 */
e336be
+	 0x81, 0x02,                  /*     Input (Variable),                */
e336be
+	 0x05, 0x09,                  /*     Usage Page (Button),             */
e336be
+	 0x09, 0x01,                  /*     Usage (01h),                     */
e336be
+	 0x25, 0x01,                  /*     Logical Maximum (1),             */
e336be
+	 0x75, 0x01,                  /*     Report Size (1),                 */
e336be
+	 0x95, 0x01,                  /*     Report Count (1),                */
e336be
+	 0x81, 0x02,                  /*     Input (Variable),                */
e336be
+	 0x95, 0x07,                  /*     Report Count (7),                */
e336be
+	 0x81, 0x03,                  /*     Input (Constant, Variable),      */
e336be
+	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
e336be
+	 0x85, 0x02,                  /*     Report ID (2),                   */
e336be
+	 0x09, 0x55,                  /*     Usage (Contact Count Maximum),   */
e336be
+	 0x09, 0x59,                  /*     Usage (59h),                     */
e336be
+	 0x75, 0x04,                  /*     Report Size (4),                 */
e336be
+	 0x95, 0x02,                  /*     Report Count (2),                */
e336be
+	 0x25, 0x0F,                  /*     Logical Maximum (15),            */
e336be
+	 0xB1, 0x02,                  /*     Feature (Variable),              */
e336be
+	 0x05, 0x0D,                  /*     Usage Page (Digitizer),          */
e336be
+	 0x85, 0x07,                  /*     Report ID (7),                   */
e336be
+	 0x09, 0x60,                  /*     Usage (60h),                     */
e336be
+	 0x75, 0x01,                  /*     Report Size (1),                 */
e336be
+	 0x95, 0x01,                  /*     Report Count (1),                */
e336be
+	 0x25, 0x01,                  /*     Logical Maximum (1),             */
e336be
+	 0xB1, 0x02,                  /*     Feature (Variable),              */
e336be
+	 0x95, 0x07,                  /*     Report Count (7),                */
e336be
+	 0xB1, 0x03,                  /*     Feature (Constant, Variable),    */
e336be
+	 0x85, 0x06,                  /*     Report ID (6),                   */
e336be
+	 0x06, 0x00, 0xFF,            /*     Usage Page (FF00h),              */
e336be
+	 0x09, 0xC5,                  /*     Usage (C5h),                     */
e336be
+	 0x26, 0xFF, 0x00,            /*     Logical Maximum (255),           */
e336be
+	 0x75, 0x08,                  /*     Report Size (8),                 */
e336be
+	 0x96, 0x00, 0x01,            /*     Report Count (256),              */
e336be
+	 0xB1, 0x02,                  /*     Feature (Variable),              */
e336be
+	 0xC0,                        /* End Collection,                      */
e336be
+	 0x06, 0x00, 0xFF,            /* Usage Page (FF00h),                  */
e336be
+	 0x09, 0x01,                  /* Usage (01h),                         */
e336be
+	 0xA1, 0x01,                  /* Collection (Application),            */
e336be
+	 0x85, 0x0D,                  /*     Report ID (13),                  */
e336be
+	 0x26, 0xFF, 0x00,            /*     Logical Maximum (255),           */
e336be
+	 0x19, 0x01,                  /*     Usage Minimum (01h),             */
e336be
+	 0x29, 0x02,                  /*     Usage Maximum (02h),             */
e336be
+	 0x75, 0x08,                  /*     Report Size (8),                 */
e336be
+	 0x95, 0x02,                  /*     Report Count (2),                */
e336be
+	 0xB1, 0x02,                  /*     Feature (Variable),              */
e336be
+	 0xC0,                        /* End Collection,                      */
e336be
+	 0x05, 0x0D,                  /* Usage Page (Digitizer),              */
e336be
+	 0x09, 0x0E,                  /* Usage (Configuration),               */
e336be
+	 0xA1, 0x01,                  /* Collection (Application),            */
e336be
+	 0x85, 0x03,                  /*     Report ID (3),                   */
e336be
+	 0x09, 0x22,                  /*     Usage (Finger),                  */
e336be
+	 0xA1, 0x02,                  /*     Collection (Logical),            */
e336be
+	 0x09, 0x52,                  /*         Usage (Device Mode),         */
e336be
+	 0x25, 0x0A,                  /*         Logical Maximum (10),        */
e336be
+	 0x95, 0x01,                  /*         Report Count (1),            */
e336be
+	 0xB1, 0x02,                  /*         Feature (Variable),          */
e336be
+	 0xC0,                        /*     End Collection,                  */
e336be
+	 0x09, 0x22,                  /*     Usage (Finger),                  */
e336be
+	 0xA1, 0x00,                  /*     Collection (Physical),           */
e336be
+	 0x85, 0x05,                  /*         Report ID (5),               */
e336be
+	 0x09, 0x57,                  /*         Usage (57h),                 */
e336be
+	 0x09, 0x58,                  /*         Usage (58h),                 */
e336be
+	 0x75, 0x01,                  /*         Report Size (1),             */
e336be
+	 0x95, 0x02,                  /*         Report Count (2),            */
e336be
+	 0x25, 0x01,                  /*         Logical Maximum (1),         */
e336be
+	 0xB1, 0x02,                  /*         Feature (Variable),          */
e336be
+	 0x95, 0x06,                  /*         Report Count (6),            */
e336be
+	 0xB1, 0x03,                  /*         Feature (Constant, Variable),*/
e336be
+	 0xC0,                        /*     End Collection,                  */
e336be
+	 0xC0                         /* End Collection                       */
e336be
+	},
e336be
+	.hid_report_desc_size = 475,
e336be
+	.i2c_name = "SYNA3602:00"
e336be
+};
e336be
+
e336be
+
e336be
+static const struct dmi_system_id i2c_hid_dmi_desc_override_table[] = {
e336be
+	{
e336be
+		.ident = "Teclast F6 Pro",
e336be
+		.matches = {
e336be
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TECLAST"),
e336be
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "F6 Pro"),
e336be
+		},
e336be
+		.driver_data = (void *)&sipodev_desc
e336be
+	},
e336be
+	{
e336be
+		.ident = "Teclast F7",
e336be
+		.matches = {
e336be
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TECLAST"),
e336be
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "F7"),
e336be
+		},
e336be
+		.driver_data = (void *)&sipodev_desc
e336be
+	},
e336be
+	{
e336be
+		.ident = "Trekstor Primebook C13",
e336be
+		.matches = {
e336be
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
e336be
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C13"),
e336be
+		},
e336be
+		.driver_data = (void *)&sipodev_desc
e336be
+	},
e336be
+	{
e336be
+		.ident = "Trekstor Primebook C11",
e336be
+		.matches = {
e336be
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
e336be
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C11"),
e336be
+		},
e336be
+		.driver_data = (void *)&sipodev_desc
e336be
+	},
e336be
+	{
e336be
+		.ident = "Direkt-Tek DTLAPY116-2",
e336be
+		.matches = {
e336be
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Direkt-Tek"),
e336be
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "DTLAPY116-2"),
e336be
+		},
e336be
+		.driver_data = (void *)&sipodev_desc
e336be
+	},
e336be
+	{
e336be
+		.ident = "Direkt-Tek DTLAPY133-1",
e336be
+		.matches = {
e336be
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Direkt-Tek"),
e336be
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "DTLAPY133-1"),
e336be
+		},
e336be
+		.driver_data = (void *)&sipodev_desc
e336be
+	},
e336be
+	{
e336be
+		.ident = "Mediacom Flexbook Edge 11",
e336be
+		.matches = {
e336be
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "MEDIACOM"),
e336be
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "FlexBook edge11 - M-FBE11"),
e336be
+		},
e336be
+		.driver_data = (void *)&sipodev_desc
e336be
+	},
e336be
+	{ }	/* Terminate list */
e336be
+};
e336be
+
e336be
+
e336be
+struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name)
e336be
+{
e336be
+	struct i2c_hid_desc_override *override;
e336be
+	const struct dmi_system_id *system_id;
e336be
+
e336be
+	system_id = dmi_first_match(i2c_hid_dmi_desc_override_table);
e336be
+	if (!system_id)
e336be
+		return NULL;
e336be
+
e336be
+	override = system_id->driver_data;
e336be
+	if (strcmp(override->i2c_name, i2c_name))
e336be
+		return NULL;
e336be
+
e336be
+	return override->i2c_hid_desc;
e336be
+}
e336be
+
e336be
+char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
e336be
+					       unsigned int *size)
e336be
+{
e336be
+	struct i2c_hid_desc_override *override;
e336be
+	const struct dmi_system_id *system_id;
e336be
+
e336be
+	system_id = dmi_first_match(i2c_hid_dmi_desc_override_table);
e336be
+	if (!system_id)
e336be
+		return NULL;
e336be
+
e336be
+	override = system_id->driver_data;
e336be
+	if (strcmp(override->i2c_name, i2c_name))
e336be
+		return NULL;
e336be
+
e336be
+	*size = override->hid_report_desc_size;
e336be
+	return override->hid_report_desc;
e336be
+}
e336be
diff --git a/drivers/hid/i2c-hid/i2c-hid.h b/drivers/hid/i2c-hid/i2c-hid.h
e336be
new file mode 100644
e336be
index 000000000000..a8c19aef5824
e336be
--- /dev/null
e336be
+++ b/drivers/hid/i2c-hid/i2c-hid.h
e336be
@@ -0,0 +1,20 @@
e336be
+/* SPDX-License-Identifier: GPL-2.0+ */
e336be
+
e336be
+#ifndef I2C_HID_H
e336be
+#define I2C_HID_H
e336be
+
e336be
+
e336be
+#ifdef CONFIG_DMI
e336be
+struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name);
e336be
+char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
e336be
+					       unsigned int *size);
e336be
+#else
e336be
+static inline struct i2c_hid_desc
e336be
+		   *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name)
e336be
+{ return NULL; }
e336be
+static inline char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
e336be
+							     unsigned int *size)
e336be
+{ return NULL; }
e336be
+#endif
e336be
+
e336be
+#endif
e336be
-- 
e336be
2.19.1
e336be