HID: add Alps I2C HID Touchpad-Stick support

Add support Alps I2C HID Touchpad and Stick device.
Signed-off-by: Masaki Ota <masaki.ota@jp.alps.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

Documentation/hid/hid-alps.txt

+ALPS HID Touchpad Protocol
+----------------------
+
+Introduction
+------------
+Currently ALPS HID driver supports U1 Touchpad device.
+
+U1 devuce basic information.
+Vender ID	0x044E
+Product ID	0x120B
+Version ID	0x0121
+
+
+HID Descriptor
+------------
+Byte	Field			Value	Notes
+0	wHIDDescLength		001E	Length of HID Descriptor : 30 bytes
+2	bcdVersion		0100	Compliant with Version 1.00
+4	wReportDescLength	00B2	Report Descriptor is 178 Bytes (0x00B2)
+6	wReportDescRegister	0002	Identifier to read Report Descriptor
+8	wInputRegister		0003	Identifier to read Input Report
+10	wMaxInputLength		0053	Input Report is 80 Bytes + 2
+12	wOutputRegister		0000	Identifier to read Output Report
+14	wMaxOutputLength	0000	No Output Reports
+16	wCommandRegister	0005	Identifier for Command Register
+18	wDataRegister		0006	Identifier for Data Register
+20	wVendorID		044E	Vendor ID 0x044E
+22	wProductID		120B	Product ID 0x120B
+24	wVersionID		0121	Version 01.21
+26	RESERVED		0000	RESERVED
+
+
+Report ID
+------------
+ReportID-1	(Input Reports)	(HIDUsage-Mouse) for TP&SP
+ReportID-2	(Input Reports)	(HIDUsage-keyboard) for TP
+ReportID-3	(Input Reports)	(Vendor Usage: Max 10 finger data) for TP
+ReportID-4	(Input Reports)	(Vendor Usage: ON bit data) for GP
+ReportID-5	(Feature Reports)	Feature Reports
+ReportID-6	(Input Reports)	(Vendor Usage: StickPointer data) for SP
+ReportID-7	(Feature Reports)	Flash update (Bootloader)
+
+
+Data pattern
+------------
+Case1	ReportID_1	TP/SP	Relative/Relative
+Case2	ReportID_3	TP	Absolute
+	ReportID_6	SP	Absolute
+
+
+Command Read/Write
+------------------
+To read/write to RAM, need to send a commands to the device.
+The command format is as below.
+
+DataByte(SET_REPORT)
+Byte1	Command Byte
+Byte2	Address - Byte 0 (LSB)
+Byte3	Address - Byte 1
+Byte4	Address - Byte 2
+Byte5	Address - Byte 3 (MSB)
+Byte6	Value Byte
+Byte7	Checksum
+
+Command Byte is read=0xD1/write=0xD2 .
+Address is read/write RAM address.
+Value Byte is writing data when you send the write commands.
+When you read RAM, there is no meaning.
+
+DataByte(GET_REPORT)
+Byte1	Response Byte
+Byte2	Address - Byte 0 (LSB)
+Byte3	Address - Byte 1
+Byte4	Address - Byte 2
+Byte5	Address - Byte 3 (MSB)
+Byte6	Value Byte
+Byte7	Checksum
+
+Read value is stored in Value Byte.
+
+
+Packet Format
+Touchpad data byte
+------------------
+	b7	b6	b5	b4	b3	b2	b1	b0
+1	0	0	SW6	SW5	SW4	SW3	SW2	SW1
+2	0	0	0	Fcv	Fn3	Fn2	Fn1	Fn0
+3	Xa0_7	Xa0_6	Xa0_5	Xa0_4	Xa0_3	Xa0_2	Xa0_1	Xa0_0
+4	Xa0_15	Xa0_14	Xa0_13	Xa0_12	Xa0_11	Xa0_10	Xa0_9	Xa0_8
+5	Ya0_7	Ya0_6	Ya0_5	Ya0_4	Ya0_3	Ya0_2	Ya0_1	Ya0_0
+6	Ya0_15	Ya0_14	Ya0_13	Ya0_12	Ya0_11	Ya0_10	Ya0_9	Ya0_8
+7	LFB0	Zs0_6	Zs0_5	Zs0_4	Zs0_3	Zs0_2	Zs0_1	Zs0_0
+
+8	Xa1_7	Xa1_6	Xa1_5	Xa1_4	Xa1_3	Xa1_2	Xa1_1	Xa1_0
+9	Xa1_15	Xa1_14	Xa1_13	Xa1_12	Xa1_11	Xa1_10	Xa1_9	Xa1_8
+10	Ya1_7	Ya1_6	Ya1_5	Ya1_4	Ya1_3	Ya1_2	Ya1_1	Ya1_0
+11	Ya1_15	Ya1_14	Ya1_13	Ya1_12	Ya1_11	Ya1_10	Ya1_9	Ya1_8
+12	LFB1	Zs1_6	Zs1_5	Zs1_4	Zs1_3	Zs1_2	Zs1_1	Zs1_0
+
+13	Xa2_7	Xa2_6	Xa2_5	Xa2_4	Xa2_3	Xa2_2	Xa2_1	Xa2_0
+14	Xa2_15	Xa2_14	Xa2_13	Xa2_12	Xa2_11	Xa2_10	Xa2_9	Xa2_8
+15	Ya2_7	Ya2_6	Ya2_5	Ya2_4	Ya2_3	Ya2_2	Ya2_1	Ya2_0
+16	Ya2_15	Ya2_14	Ya2_13	Ya2_12	Ya2_11	Ya2_10	Ya2_9	Ya2_8
+17	LFB2	Zs2_6	Zs2_5	Zs2_4	Zs2_3	Zs2_2	Zs2_1	Zs2_0
+
+18	Xa3_7	Xa3_6	Xa3_5	Xa3_4	Xa3_3	Xa3_2	Xa3_1	Xa3_0
+19	Xa3_15	Xa3_14	Xa3_13	Xa3_12	Xa3_11	Xa3_10	Xa3_9	Xa3_8
+20	Ya3_7	Ya3_6	Ya3_5	Ya3_4	Ya3_3	Ya3_2	Ya3_1	Ya3_0
+21	Ya3_15	Ya3_14	Ya3_13	Ya3_12	Ya3_11	Ya3_10	Ya3_9	Ya3_8
+22	LFB3	Zs3_6	Zs3_5	Zs3_4	Zs3_3	Zs3_2	Zs3_1	Zs3_0
+
+23	Xa4_7	Xa4_6	Xa4_5	Xa4_4	Xa4_3	Xa4_2	Xa4_1	Xa4_0
+24	Xa4_15	Xa4_14	Xa4_13	Xa4_12	Xa4_11	Xa4_10	Xa4_9	Xa4_8
+25	Ya4_7	Ya4_6	Ya4_5	Ya4_4	Ya4_3	Ya4_2	Ya4_1	Ya4_0
+26	Ya4_15	Ya4_14	Ya4_13	Ya4_12	Ya4_11	Ya4_10	Ya4_9	Ya4_8
+27	LFB4	Zs4_6	Zs4_5	Zs4_4	Zs4_3	Zs4_2	Zs4_1	Zs4_0
+
+
+SW1-SW6:	SW ON/OFF status
+Xan_15-0(16bit):X Absolute data of the "n"th finger
+Yan_15-0(16bit):Y Absolute data of the "n"th finger
+Zsn_6-0(7bit):	Operation area of the "n"th finger
+
+
+StickPointer data byte
+------------------
+	b7	b6	b5	b4	b3	b2	b1	b0
+Byte1	1	1	1	0	1	SW3	SW2	SW1
+Byte2	X7	X6	X5	X4	X3	X2	X1	X0
+Byte3	X15	X14	X13	X12	X11	X10	X9	X8
+Byte4	Y7	Y6	Y5	Y4	Y3	Y2	Y1	Y0
+Byte5	Y15	Y14	Y13	Y12	Y11	Y10	Y9	Y8
+Byte6	Z7	Z6	Z5	Z4	Z3	Z2	Z1	Z0
+Byte7	T&P	Z14	Z13	Z12	Z11	Z10	Z9	Z8
+
+SW1-SW3:	SW ON/OFF status
+Xn_15-0(16bit):X Absolute data
+Yn_15-0(16bit):Y Absolute data
+Zn_14-0(15bit):Z

drivers/hid/Kconfig

@@ -936,6 +936,14 @@ config HID_SENSOR_CUSTOM_SENSOR
 	  standard sensors.
 	  Select this config option for custom/generic sensor support.
 
+config HID_ALPS
+	tristate "Alps HID device support"
+	depends on HID
+	---help---
+	Support for Alps I2C HID touchpads and StickPointer.
+	Say Y here if you have a Alps touchpads over i2c-hid or usbhid
+	and want support for its special functionalities.
+
 endmenu
 
 endif # HID

drivers/hid/Makefile

@@ -21,6 +21,7 @@ hid-wiimote-y		:= hid-wiimote-core.o hid-wiimote-modules.o
 hid-wiimote-$(CONFIG_DEBUG_FS)	+= hid-wiimote-debug.o
 
 obj-$(CONFIG_HID_A4TECH)	+= hid-a4tech.o
+obj-$(CONFIG_HID_ALPS)		+= hid-alps.o
 obj-$(CONFIG_HID_ACRUX)		+= hid-axff.o
 obj-$(CONFIG_HID_APPLE)		+= hid-apple.o
 obj-$(CONFIG_HID_APPLEIR)	+= hid-appleir.o

drivers/hid/hid-alps.c

+/*
+ *  Copyright (c) 2016 Masaki Ota <masaki.ota@jp.alps.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/hid.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/module.h>
+#include <asm/unaligned.h>
+#include "hid-ids.h"
+
+/* ALPS Device Product ID */
+#define HID_PRODUCT_ID_T3_BTNLESS	0xD0C0
+#define HID_PRODUCT_ID_COSMO		0x1202
+#define HID_PRODUCT_ID_U1_PTP_1		0x1207
+#define HID_PRODUCT_ID_U1			0x1209
+#define HID_PRODUCT_ID_U1_PTP_2		0x120A
+#define HID_PRODUCT_ID_U1_DUAL		0x120B
+#define HID_PRODUCT_ID_T4_BTNLESS	0x120C
+
+#define DEV_SINGLEPOINT				0x01
+#define DEV_DUALPOINT				0x02
+
+#define U1_MOUSE_REPORT_ID			0x01 /* Mouse data ReportID */
+#define U1_ABSOLUTE_REPORT_ID		0x03 /* Absolute data ReportID */
+#define U1_FEATURE_REPORT_ID		0x05 /* Feature ReportID */
+#define U1_SP_ABSOLUTE_REPORT_ID	0x06 /* Feature ReportID */
+
+#define U1_FEATURE_REPORT_LEN		0x08 /* Feature Report Length */
+#define U1_FEATURE_REPORT_LEN_ALL	0x0A
+#define U1_CMD_REGISTER_READ		0xD1
+#define U1_CMD_REGISTER_WRITE		0xD2
+
+#define	U1_DEVTYPE_SP_SUPPORT		0x10 /* SP Support */
+#define	U1_DISABLE_DEV				0x01
+#define U1_TP_ABS_MODE				0x02
+#define	U1_SP_ABS_MODE				0x80
+
+#define ADDRESS_U1_DEV_CTRL_1	0x00800040
+#define ADDRESS_U1_DEVICE_TYP	0x00800043
+#define ADDRESS_U1_NUM_SENS_X	0x00800047
+#define ADDRESS_U1_NUM_SENS_Y	0x00800048
+#define ADDRESS_U1_PITCH_SENS_X	0x00800049
+#define ADDRESS_U1_PITCH_SENS_Y	0x0080004A
+#define ADDRESS_U1_RESO_DWN_ABS 0x0080004E
+#define ADDRESS_U1_PAD_BTN		0x00800052
+#define ADDRESS_U1_SP_BTN		0x0080009F
+
+#define MAX_TOUCHES	5
+
+/**
+ * struct u1_data
+ *
+ * @input: pointer to the kernel input device
+ * @input2: pointer to the kernel input2 device
+ * @hdev: pointer to the struct hid_device
+ *
+ * @dev_ctrl: device control parameter
+ * @dev_type: device type
+ * @sen_line_num_x: number of sensor line of X
+ * @sen_line_num_y: number of sensor line of Y
+ * @pitch_x: sensor pitch of X
+ * @pitch_y: sensor pitch of Y
+ * @resolution: resolution
+ * @btn_info: button information
+ * @x_active_len_mm: active area length of X (mm)
+ * @y_active_len_mm: active area length of Y (mm)
+ * @x_max: maximum x coordinate value
+ * @y_max: maximum y coordinate value
+ * @btn_cnt: number of buttons
+ * @sp_btn_cnt: number of stick buttons
+ */
+struct u1_dev {
+	struct input_dev *input;
+	struct input_dev *input2;
+	struct hid_device *hdev;
+
+	u8	dev_ctrl;
+	u8	dev_type;
+	u8	sen_line_num_x;
+	u8	sen_line_num_y;
+	u8	pitch_x;
+	u8	pitch_y;
+	u8	resolution;
+	u8	btn_info;
+	u8	sp_btn_info;
+	u32	x_active_len_mm;
+	u32	y_active_len_mm;
+	u32	x_max;
+	u32	y_max;
+	u32	btn_cnt;
+	u32	sp_btn_cnt;
+};
+
+struct u1_dev *priv;
+
+static int u1_read_write_register(struct hid_device *hdev, u32 address,
+	u8 *read_val, u8 write_val, bool read_flag)
+{
+	int ret, i;
+	u8 check_sum;
+	u8 *input;
+	u8 *readbuf;
+
+	input = kzalloc(sizeof(u8)*U1_FEATURE_REPORT_LEN, GFP_KERNEL);
+	if (!input)
+		return -ENOMEM;
+
+	readbuf = kzalloc(sizeof(u8)*U1_FEATURE_REPORT_LEN, GFP_KERNEL);
+	if (!readbuf) {
+		kfree(input);
+		return -ENOMEM;
+	}
+
+	input[0] = U1_FEATURE_REPORT_ID;
+	if (read_flag) {
+		input[1] = U1_CMD_REGISTER_READ;
+		input[6] = 0x00;
+	} else {
+		input[1] = U1_CMD_REGISTER_WRITE;
+		input[6] = write_val;
+	}
+
+	put_unaligned_le32(address, input + 2);
+
+	/* Calculate the checksum */
+	check_sum = U1_FEATURE_REPORT_LEN_ALL;
+	for (i = 0; i < U1_FEATURE_REPORT_LEN - 1; i++)
+		check_sum += input[i];
+
+	input[7] = check_sum;
+	ret = hid_hw_raw_request(hdev, U1_FEATURE_REPORT_ID, input,
+			sizeof(input), HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+
+	if (ret < 0) {
+		dev_err(&hdev->dev, "failed to read command (%d)\n", ret);
+		goto exit;
+	}
+
+	if (read_flag) {
+		ret = hid_hw_raw_request(hdev, U1_FEATURE_REPORT_ID, readbuf,
+				sizeof(readbuf), HID_FEATURE_REPORT,
+				HID_REQ_GET_REPORT);
+
+		if (ret < 0) {
+			dev_err(&hdev->dev, "failed read register (%d)\n", ret);
+			goto exit;
+		}
+
+		*read_val = readbuf[6];
+	}
+
+	kfree(input);
+	kfree(readbuf);
+	return 0;
+
+exit:
+	kfree(input);
+	kfree(readbuf);
+	return ret;
+}
+
+static int alps_raw_event(struct hid_device *hdev,
+		struct hid_report *report, u8 *data, int size)
+{
+	int x[MAX_TOUCHES], y[MAX_TOUCHES], z[MAX_TOUCHES];
+	int i, left, right, middle;
+	short sp_x, sp_y, sp_z;
+	struct u1_dev *hdata = hid_get_drvdata(hdev);
+
+	switch (data[0]) {
+	case U1_MOUSE_REPORT_ID:
+		break;
+	case U1_FEATURE_REPORT_ID:
+		break;
+	case U1_ABSOLUTE_REPORT_ID:
+		for (i = 0; i < MAX_TOUCHES; i++) {
+			x[i] = (data[3+(5*i)] | (data[4+(5*i)] << 8));
+			y[i] = (data[5+(5*i)] | (data[6+(5*i)] << 8));
+			z[i] = data[7+(5*i)] & 0x7F;
+			left = data[1] & 0x1;
+			right = (data[1] & 0x2) >> 1;
+			middle = (data[1] & 0x4) >> 2;
+
+			input_mt_slot(hdata->input, i);
+
+			if (z[i] != 0) {
+				input_mt_report_slot_state(hdata->input,
+					MT_TOOL_FINGER, 1);
+			} else {
+				input_mt_report_slot_state(hdata->input,
+					MT_TOOL_FINGER, 0);
+				break;
+			}
+
+			input_event(hdata->input, EV_ABS,
+				ABS_MT_POSITION_X, x[i]);
+			input_event(hdata->input, EV_ABS,
+				ABS_MT_POSITION_Y, y[i]);
+			input_event(hdata->input, EV_ABS,
+				ABS_MT_PRESSURE, z[i]);
+		}
+
+		input_mt_sync_frame(hdata->input);
+		input_sync(hdata->input);
+
+		input_event(hdata->input, EV_KEY, BTN_LEFT, left);
+		input_event(hdata->input, EV_KEY, BTN_RIGHT, right);
+		input_event(hdata->input, EV_KEY, BTN_MIDDLE, middle);
+
+		return 1;
+
+	case U1_SP_ABSOLUTE_REPORT_ID:
+		sp_x = (data[2] | (data[3] << 8));
+		sp_y = (data[4] | (data[5] << 8));
+		sp_z = (data[6] | data[7]) & 0x7FFF;
+		left = data[1] & 0x1;
+		right = (data[1] & 0x2) >> 1;
+		middle = (data[1] & 0x4) >> 2;
+
+		sp_x = sp_x / 8;
+		sp_y = sp_y / 8;
+
+		input_event(priv->input2, EV_REL, REL_X, sp_x);
+		input_event(priv->input2, EV_REL, REL_Y, sp_y);
+
+		input_event(priv->input2, EV_KEY, BTN_LEFT, left);
+		input_event(priv->input2, EV_KEY, BTN_RIGHT, right);
+		input_event(priv->input2, EV_KEY, BTN_MIDDLE, middle);
+
+		input_sync(priv->input2);
+
+		return 1;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int alps_post_reset(struct hid_device *hdev)
+{
+	return u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,
+				NULL, U1_TP_ABS_MODE, false);
+}
+
+static int alps_post_resume(struct hid_device *hdev)
+{
+	return u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,
+				NULL, U1_TP_ABS_MODE, false);
+}
+#endif /* CONFIG_PM */
+
+static int alps_input_configured(struct hid_device *hdev, struct hid_input *hi)
+{
+	struct u1_dev *data = hid_get_drvdata(hdev);
+	struct input_dev *input = hi->input, *input2;
+	struct u1_dev devInfo;
+	int ret;
+	int res_x, res_y, i;
+
+	/* Check device product ID */
+	switch (hdev->product) {
+	case HID_PRODUCT_ID_U1:
+	case HID_PRODUCT_ID_U1_DUAL:
+		break;
+	default:
+		return 0;
+	}
+
+	data->input = input;
+
+	hid_dbg(hdev, "Opening low level driver\n");
+	ret = hid_hw_open(hdev);
+	if (ret)
+		return ret;
+
+	/* Allow incoming hid reports */
+	hid_device_io_start(hdev);
+
+	/* Device initialization */
+	ret = u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,
+			&devInfo.dev_ctrl, 0, true);
+	if (ret < 0) {
+		dev_err(&hdev->dev, "failed U1_DEV_CTRL_1 (%d)\n", ret);
+		goto exit;
+	}
+
+	devInfo.dev_ctrl &= ~U1_DISABLE_DEV;
+	devInfo.dev_ctrl |= U1_TP_ABS_MODE;
+	ret = u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,
+			NULL, devInfo.dev_ctrl, false);
+	if (ret < 0) {
+		dev_err(&hdev->dev, "failed to change TP mode (%d)\n", ret);
+		goto exit;
+	}
+
+	ret = u1_read_write_register(hdev, ADDRESS_U1_NUM_SENS_X,
+			&devInfo.sen_line_num_x, 0, true);
+	if (ret < 0) {
+		dev_err(&hdev->dev, "failed U1_NUM_SENS_X (%d)\n", ret);
+		goto exit;
+	}
+
+	ret = u1_read_write_register(hdev, ADDRESS_U1_NUM_SENS_Y,
+			&devInfo.sen_line_num_y, 0, true);
+		if (ret < 0) {
+		dev_err(&hdev->dev, "failed U1_NUM_SENS_Y (%d)\n", ret);
+		goto exit;
+	}
+
+	ret = u1_read_write_register(hdev, ADDRESS_U1_PITCH_SENS_X,
+			&devInfo.pitch_x, 0, true);
+	if (ret < 0) {
+		dev_err(&hdev->dev, "failed U1_PITCH_SENS_X (%d)\n", ret);
+		goto exit;
+	}
+
+	ret = u1_read_write_register(hdev, ADDRESS_U1_PITCH_SENS_Y,
+			&devInfo.pitch_y, 0, true);
+	if (ret < 0) {
+		dev_err(&hdev->dev, "failed U1_PITCH_SENS_Y (%d)\n", ret);
+		goto exit;
+	}
+
+	ret = u1_read_write_register(hdev, ADDRESS_U1_RESO_DWN_ABS,
+		&devInfo.resolution, 0, true);
+	if (ret < 0) {
+		dev_err(&hdev->dev, "failed U1_RESO_DWN_ABS (%d)\n", ret);
+		goto exit;
+	}
+
+	ret = u1_read_write_register(hdev, ADDRESS_U1_PAD_BTN,
+			&devInfo.btn_info, 0, true);
+	if (ret < 0) {
+		dev_err(&hdev->dev, "failed U1_PAD_BTN (%d)\n", ret);
+		goto exit;
+	}
+
+	/* Check StickPointer device */
+	ret = u1_read_write_register(hdev, ADDRESS_U1_DEVICE_TYP,
+			&devInfo.dev_type, 0, true);
+	if (ret < 0) {
+		dev_err(&hdev->dev, "failed U1_DEVICE_TYP (%d)\n", ret);
+		goto exit;
+	}
+
+	devInfo.x_active_len_mm =
+		(devInfo.pitch_x * (devInfo.sen_line_num_x - 1)) / 10;
+	devInfo.y_active_len_mm =
+		(devInfo.pitch_y * (devInfo.sen_line_num_y - 1)) / 10;
+
+	devInfo.x_max =
+		(devInfo.resolution << 2) * (devInfo.sen_line_num_x - 1);
+	devInfo.y_max =
+		(devInfo.resolution << 2) * (devInfo.sen_line_num_y - 1);
+
+	__set_bit(EV_ABS, input->evbit);
+	input_set_abs_params(input, ABS_MT_POSITION_X, 1, devInfo.x_max, 0, 0);
+	input_set_abs_params(input, ABS_MT_POSITION_Y, 1, devInfo.y_max, 0, 0);
+
+	if (devInfo.x_active_len_mm && devInfo.y_active_len_mm) {
+		res_x = (devInfo.x_max - 1) / devInfo.x_active_len_mm;
+		res_y = (devInfo.y_max - 1) / devInfo.y_active_len_mm;
+
+		input_abs_set_res(input, ABS_MT_POSITION_X, res_x);
+		input_abs_set_res(input, ABS_MT_POSITION_Y, res_y);
+	}
+
+	input_set_abs_params(input, ABS_MT_PRESSURE, 0, 64, 0, 0);
+
+	input_mt_init_slots(input, MAX_TOUCHES, INPUT_MT_POINTER);
+
+	__set_bit(EV_KEY, input->evbit);
+	if ((devInfo.btn_info & 0x0F) == (devInfo.btn_info & 0xF0) >> 4) {
+		devInfo.btn_cnt = (devInfo.btn_info & 0x0F);
+	} else {
+		/* Button pad */
+		devInfo.btn_cnt = 1;
+		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
+	}
+
+	for (i = 0; i < devInfo.btn_cnt; i++)
+		__set_bit(BTN_LEFT + i, input->keybit);
+
+
+	/* Stick device initialization */
+	if (devInfo.dev_type & U1_DEVTYPE_SP_SUPPORT) {
+
+		priv = kzalloc(sizeof(struct u1_dev), GFP_KERNEL);
+		if (!priv) {
+			hid_device_io_stop(hdev);
+			hid_hw_close(hdev);
+			return -ENOMEM;
+		}
+
+		input2 = input_allocate_device();
+		if (!input2) {
+			input_free_device(input2);
+			goto exit;
+		}
+
+		priv->input2 = input2;
+
+		devInfo.dev_ctrl |= U1_SP_ABS_MODE;
+		ret = u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,
+			NULL, devInfo.dev_ctrl, false);
+		if (ret < 0) {
+			dev_err(&hdev->dev, "failed SP mode (%d)\n", ret);
+			input_free_device(input2);
+			goto exit;
+		}
+
+		ret = u1_read_write_register(hdev, ADDRESS_U1_SP_BTN,
+			&devInfo.sp_btn_info, 0, true);
+		if (ret < 0) {
+			dev_err(&hdev->dev, "failed U1_SP_BTN (%d)\n", ret);
+			input_free_device(input2);
+			goto exit;
+		}
+
+		input2->phys = input->phys;
+		input2->name = "DualPoint Stick";
+		input2->id.bustype = BUS_I2C;
+		input2->id.vendor  = input->id.vendor;
+		input2->id.product = input->id.product;
+		input2->id.version = input->id.version;
+		input2->dev.parent = input->dev.parent;
+
+		__set_bit(EV_KEY, input2->evbit);
+		devInfo.sp_btn_cnt = (devInfo.sp_btn_info & 0x0F);
+		for (i = 0; i < devInfo.sp_btn_cnt; i++)
+			__set_bit(BTN_LEFT + i, input2->keybit);
+
+		__set_bit(EV_REL, input2->evbit);
+		__set_bit(REL_X, input2->relbit);
+		__set_bit(REL_Y, input2->relbit);
+		__set_bit(INPUT_PROP_POINTER, input2->propbit);
+		__set_bit(INPUT_PROP_POINTING_STICK, input2->propbit);
+
+		if (input_register_device(priv->input2)) {
+			input_free_device(input2);
+			goto exit;
+		}
+	}
+
+exit:
+	hid_device_io_stop(hdev);
+	hid_hw_close(hdev);
+	return ret;
+}
+
+static int alps_input_mapping(struct hid_device *hdev,
+		struct hid_input *hi, struct hid_field *field,
+		struct hid_usage *usage, unsigned long **bit, int *max)
+{
+	return -1;
+}
+
+static int alps_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	struct u1_dev *data = NULL;
+	int ret;
+
+	data = devm_kzalloc(&hdev->dev, sizeof(struct u1_dev), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->hdev = hdev;
+	hid_set_drvdata(hdev, data);
+
+	hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		hid_err(hdev, "parse failed\n");
+		return ret;
+	}
+
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (ret) {
+		hid_err(hdev, "hw start failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void alps_remove(struct hid_device *hdev)
+{
+	hid_hw_stop(hdev);
+	kfree(priv);
+}
+
+static const struct hid_device_id alps_id[] = {
+	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY,
+		USB_VENDOR_ID_ALPS_JP, HID_ANY_ID) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, alps_id);
+
+static struct hid_driver alps_driver = {
+	.name = "hid-alps",
+	.id_table		= alps_id,
+	.probe			= alps_probe,
+	.remove			= alps_remove,
+	.raw_event		= alps_raw_event,
+	.input_mapping		= alps_input_mapping,
+	.input_configured	= alps_input_configured,
+#ifdef CONFIG_PM
+	.resume			= alps_post_resume,
+	.reset_resume		= alps_post_reset,
+#endif
+};
+
+module_hid_driver(alps_driver);
+
+MODULE_AUTHOR("Masaki Ota <masaki.ota@jp.alps.com>");
+MODULE_DESCRIPTION("ALPS HID driver");
+MODULE_LICENSE("GPL");

drivers/hid/hid-ids.h

@@ -70,6 +70,8 @@
 #define USB_VENDOR_ID_ALPS		0x0433
 #define USB_DEVICE_ID_IBM_GAMEPAD	0x1101
 
+#define USB_VENDOR_ID_ALPS_JP		0x044E
+
 #define USB_VENDOR_ID_ANTON		0x1130
 #define USB_DEVICE_ID_ANTON_TOUCH_PAD	0x3101