// SPDX-License-Identifier: GPL-2.0-or-later

  /*
   *  Copyright (c) 2016 Masaki Ota <masaki.ota@jp.alps.com>

   */
  
  #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_ABSOLUTE_REPORT_ID_SECD  0x02 /* FW-PTP 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 T4_INPUT_REPORT_LEN			sizeof(struct t4_input_report)
  #define T4_FEATURE_REPORT_LEN		T4_INPUT_REPORT_LEN
  #define T4_FEATURE_REPORT_ID		7
  #define T4_CMD_REGISTER_READ			0x08
  #define T4_CMD_REGISTER_WRITE			0x07
  
  #define T4_ADDRESS_BASE				0xC2C0
  #define PRM_SYS_CONFIG_1			(T4_ADDRESS_BASE + 0x0002)
  #define T4_PRM_FEED_CONFIG_1		(T4_ADDRESS_BASE + 0x0004)
  #define T4_PRM_FEED_CONFIG_4		(T4_ADDRESS_BASE + 0x001A)
  #define T4_PRM_ID_CONFIG_3			(T4_ADDRESS_BASE + 0x00B0)
  
  
  #define T4_FEEDCFG4_ADVANCED_ABS_ENABLE			0x01
  #define T4_I2C_ABS	0x78
  
  #define T4_COUNT_PER_ELECTRODE		256

  #define MAX_TOUCHES	5

  enum dev_num {
  	U1,
  	T4,
  	UNKNOWN,
  };

  /**
   * 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_type: device type

   * @max_fingers: total number of fingers
   * @has_sp: boolean of sp existense
   * @sp_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

   * @x_min: minimum x coordinate value
   * @y_min: minimum y coordinate value

   * @btn_cnt: number of buttons
   * @sp_btn_cnt: number of stick buttons
   */

  struct alps_dev {

  	struct input_dev *input;
  	struct input_dev *input2;
  	struct hid_device *hdev;

  	enum dev_num dev_type;

  	u8  max_fingers;
  	u8  has_sp;

  	u8	sp_btn_info;
  	u32	x_active_len_mm;
  	u32	y_active_len_mm;
  	u32	x_max;
  	u32	y_max;

  	u32	x_min;
  	u32	y_min;

  	u32	btn_cnt;
  	u32	sp_btn_cnt;
  };

  struct t4_contact_data {
  	u8  palm;
  	u8	x_lo;
  	u8	x_hi;
  	u8	y_lo;
  	u8	y_hi;
  };
  
  struct t4_input_report {
  	u8  reportID;
  	u8  numContacts;
  	struct t4_contact_data contact[5];
  	u8  button;
  	u8  track[5];
  	u8  zx[5], zy[5];
  	u8  palmTime[5];
  	u8  kilroy;
  	u16 timeStamp;
  };
  
  static u16 t4_calc_check_sum(u8 *buffer,
  		unsigned long offset, unsigned long length)
  {
  	u16 sum1 = 0xFF, sum2 = 0xFF;
  	unsigned long i = 0;
  
  	if (offset + length >= 50)
  		return 0;
  
  	while (length > 0) {
  		u32 tlen = length > 20 ? 20 : length;
  
  		length -= tlen;
  
  		do {
  			sum1 += buffer[offset + i];
  			sum2 += sum1;
  			i++;
  		} while (--tlen > 0);
  
  		sum1 = (sum1 & 0xFF) + (sum1 >> 8);
  		sum2 = (sum2 & 0xFF) + (sum2 >> 8);
  	}
  
  	sum1 = (sum1 & 0xFF) + (sum1 >> 8);
  	sum2 = (sum2 & 0xFF) + (sum2 >> 8);
  
  	return(sum2 << 8 | sum1);
  }
  
  static int t4_read_write_register(struct hid_device *hdev, u32 address,
  	u8 *read_val, u8 write_val, bool read_flag)
  {
  	int ret;
  	u16 check_sum;
  	u8 *input;

  	u8 *readbuf = NULL;

  
  	input = kzalloc(T4_FEATURE_REPORT_LEN, GFP_KERNEL);
  	if (!input)
  		return -ENOMEM;
  
  	input[0] = T4_FEATURE_REPORT_ID;
  	if (read_flag) {
  		input[1] = T4_CMD_REGISTER_READ;
  		input[8] = 0x00;
  	} else {
  		input[1] = T4_CMD_REGISTER_WRITE;
  		input[8] = write_val;
  	}
  	put_unaligned_le32(address, input + 2);
  	input[6] = 1;
  	input[7] = 0;
  
  	/* Calculate the checksum */
  	check_sum = t4_calc_check_sum(input, 1, 8);
  	input[9] = (u8)check_sum;
  	input[10] = (u8)(check_sum >> 8);
  	input[11] = 0;
  
  	ret = hid_hw_raw_request(hdev, T4_FEATURE_REPORT_ID, input,
  			T4_FEATURE_REPORT_LEN,
  			HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
  
  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed to read command (%d)
  ", ret);
  		goto exit;
  	}

  	if (read_flag) {

  		readbuf = kzalloc(T4_FEATURE_REPORT_LEN, GFP_KERNEL);

  		if (!readbuf) {
  			ret = -ENOMEM;
  			goto exit;
  		}
  
  		ret = hid_hw_raw_request(hdev, T4_FEATURE_REPORT_ID, readbuf,
  				T4_FEATURE_REPORT_LEN,
  				HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
  		if (ret < 0) {
  			dev_err(&hdev->dev, "failed read register (%d)
  ", ret);
  			goto exit_readbuf;
  		}

  		ret = -EINVAL;

  		if (*(u32 *)&readbuf[6] != address) {
  			dev_err(&hdev->dev, "read register address error (%x,%x)
  ",

  				*(u32 *)&readbuf[6], address);

  			goto exit_readbuf;
  		}
  
  		if (*(u16 *)&readbuf[10] != 1) {
  			dev_err(&hdev->dev, "read register size error (%x)
  ",

  				*(u16 *)&readbuf[10]);

  			goto exit_readbuf;
  		}
  
  		check_sum = t4_calc_check_sum(readbuf, 6, 7);
  		if (*(u16 *)&readbuf[13] != check_sum) {
  			dev_err(&hdev->dev, "read register checksum error (%x,%x)
  ",

  				*(u16 *)&readbuf[13], check_sum);

  			goto exit_readbuf;
  		}
  
  		*read_val = readbuf[12];
  	}
  
  	ret = 0;
  
  exit_readbuf:
  	kfree(readbuf);
  exit:
  	kfree(input);
  	return ret;
  }

  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(U1_FEATURE_REPORT_LEN, GFP_KERNEL);

  	if (!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,

  			U1_FEATURE_REPORT_LEN,
  			HID_FEATURE_REPORT, HID_REQ_SET_REPORT);

  
  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed to read command (%d)
  ", ret);
  		goto exit;
  	}
  
  	if (read_flag) {

  		readbuf = kzalloc(U1_FEATURE_REPORT_LEN, GFP_KERNEL);
  		if (!readbuf) {

  			ret = -ENOMEM;
  			goto exit;

  		}

  		ret = hid_hw_raw_request(hdev, U1_FEATURE_REPORT_ID, readbuf,

  				U1_FEATURE_REPORT_LEN,

  				HID_FEATURE_REPORT, HID_REQ_GET_REPORT);

  
  		if (ret < 0) {
  			dev_err(&hdev->dev, "failed read register (%d)
  ", ret);

  			kfree(readbuf);

  			goto exit;
  		}
  
  		*read_val = readbuf[6];

  
  		kfree(readbuf);

  	}

  	ret = 0;

  
  exit:
  	kfree(input);

  	return ret;
  }

  static int t4_raw_event(struct alps_dev *hdata, u8 *data, int size)
  {
  	unsigned int x, y, z;
  	int i;
  	struct t4_input_report *p_report = (struct t4_input_report *)data;
  
  	if (!data)
  		return 0;
  	for (i = 0; i < hdata->max_fingers; i++) {
  		x = p_report->contact[i].x_hi << 8 | p_report->contact[i].x_lo;
  		y = p_report->contact[i].y_hi << 8 | p_report->contact[i].y_lo;
  		y = hdata->y_max - y + hdata->y_min;
  		z = (p_report->contact[i].palm < 0x80 &&
  			p_report->contact[i].palm > 0) * 62;
  		if (x == 0xffff) {
  			x = 0;
  			y = 0;
  			z = 0;
  		}
  		input_mt_slot(hdata->input, i);
  
  		input_mt_report_slot_state(hdata->input,
  			MT_TOOL_FINGER, z != 0);
  
  		if (!z)
  			continue;
  
  		input_report_abs(hdata->input, ABS_MT_POSITION_X, x);
  		input_report_abs(hdata->input, ABS_MT_POSITION_Y, y);
  		input_report_abs(hdata->input, ABS_MT_PRESSURE, z);
  	}
  	input_mt_sync_frame(hdata->input);
  
  	input_report_key(hdata->input, BTN_LEFT, p_report->button);
  
  	input_sync(hdata->input);
  	return 1;
  }
  
  static int u1_raw_event(struct alps_dev *hdata, u8 *data, int size)

  {

  	unsigned int x, y, z;
  	int i;
  	short sp_x, sp_y;

  	if (!data)
  		return 0;

  	switch (data[0]) {
  	case U1_MOUSE_REPORT_ID:
  		break;
  	case U1_FEATURE_REPORT_ID:
  		break;
  	case U1_ABSOLUTE_REPORT_ID:

  	case U1_ABSOLUTE_REPORT_ID_SECD:

  		for (i = 0; i < hdata->max_fingers; i++) {

  			u8 *contact = &data[i * 5];
  
  			x = get_unaligned_le16(contact + 3);
  			y = get_unaligned_le16(contact + 5);
  			z = contact[7] & 0x7F;

  
  			input_mt_slot(hdata->input, i);

  			if (z != 0) {

  				input_mt_report_slot_state(hdata->input,
  					MT_TOOL_FINGER, 1);

  				input_report_abs(hdata->input,
  					ABS_MT_POSITION_X, x);
  				input_report_abs(hdata->input,
  					ABS_MT_POSITION_Y, y);
  				input_report_abs(hdata->input,
  					ABS_MT_PRESSURE, z);

  			} else {

  				input_mt_report_slot_inactive(hdata->input);

  			}

  		}
  
  		input_mt_sync_frame(hdata->input);

  		input_report_key(hdata->input, BTN_LEFT,
  			data[1] & 0x1);
  		input_report_key(hdata->input, BTN_RIGHT,
  			(data[1] & 0x2));
  		input_report_key(hdata->input, BTN_MIDDLE,
  			(data[1] & 0x4));
  
  		input_sync(hdata->input);

  
  		return 1;
  
  	case U1_SP_ABSOLUTE_REPORT_ID:

  		sp_x = get_unaligned_le16(data+2);
  		sp_y = get_unaligned_le16(data+4);

  
  		sp_x = sp_x / 8;
  		sp_y = sp_y / 8;

  		input_report_rel(hdata->input2, REL_X, sp_x);
  		input_report_rel(hdata->input2, REL_Y, sp_y);

  		input_report_key(hdata->input2, BTN_LEFT,
  			data[1] & 0x1);
  		input_report_key(hdata->input2, BTN_RIGHT,
  			(data[1] & 0x2));
  		input_report_key(hdata->input2, BTN_MIDDLE,
  			(data[1] & 0x4));

  		input_sync(hdata->input2);

  
  		return 1;
  	}
  
  	return 0;
  }

  static int alps_raw_event(struct hid_device *hdev,
  		struct hid_report *report, u8 *data, int size)

  {

  	int ret = 0;
  	struct alps_dev *hdata = hid_get_drvdata(hdev);
  
  	switch (hdev->product) {
  	case HID_PRODUCT_ID_T4_BTNLESS:
  		ret = t4_raw_event(hdata, data, size);
  		break;
  	default:
  		ret = u1_raw_event(hdata, data, size);
  		break;
  	}
  	return ret;

  }

  static int __maybe_unused alps_post_reset(struct hid_device *hdev)

  {

  	int ret = -1;
  	struct alps_dev *data = hid_get_drvdata(hdev);
  
  	switch (data->dev_type) {
  	case T4:
  		ret = t4_read_write_register(hdev, T4_PRM_FEED_CONFIG_1,
  			NULL, T4_I2C_ABS, false);

  		if (ret < 0) {
  			dev_err(&hdev->dev, "failed T4_PRM_FEED_CONFIG_1 (%d)
  ",
  				ret);
  			goto exit;
  		}

  		ret = t4_read_write_register(hdev, T4_PRM_FEED_CONFIG_4,
  			NULL, T4_FEEDCFG4_ADVANCED_ABS_ENABLE, false);

  		if (ret < 0) {
  			dev_err(&hdev->dev, "failed T4_PRM_FEED_CONFIG_4 (%d)
  ",
  				ret);
  			goto exit;
  		}

  		break;
  	case U1:
  		ret = u1_read_write_register(hdev,
  			ADDRESS_U1_DEV_CTRL_1, NULL,
  			U1_TP_ABS_MODE | U1_SP_ABS_MODE, false);

  		if (ret < 0) {
  			dev_err(&hdev->dev, "failed to change TP mode (%d)
  ",
  				ret);
  			goto exit;
  		}

  		break;
  	default:
  		break;
  	}

  
  exit:

  	return ret;
  }
  
  static int __maybe_unused alps_post_resume(struct hid_device *hdev)
  {
  	return alps_post_reset(hdev);

  }

  static int u1_init(struct hid_device *hdev, struct alps_dev *pri_data)

  {

  	int ret;

  	u8 tmp, dev_ctrl, sen_line_num_x, sen_line_num_y;
  	u8 pitch_x, pitch_y, resolution;

  
  	/* Device initialization */
  	ret = u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,

  			&dev_ctrl, 0, true);

  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed U1_DEV_CTRL_1 (%d)
  ", ret);
  		goto exit;
  	}

  	dev_ctrl &= ~U1_DISABLE_DEV;
  	dev_ctrl |= U1_TP_ABS_MODE;

  	ret = u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,

  			NULL, dev_ctrl, false);

  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed to change TP mode (%d)
  ", ret);
  		goto exit;
  	}
  
  	ret = u1_read_write_register(hdev, ADDRESS_U1_NUM_SENS_X,

  			&sen_line_num_x, 0, true);

  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed U1_NUM_SENS_X (%d)
  ", ret);
  		goto exit;
  	}
  
  	ret = u1_read_write_register(hdev, ADDRESS_U1_NUM_SENS_Y,

  			&sen_line_num_y, 0, true);

  	if (ret < 0) {

  		dev_err(&hdev->dev, "failed U1_NUM_SENS_Y (%d)
  ", ret);
  		goto exit;
  	}
  
  	ret = u1_read_write_register(hdev, ADDRESS_U1_PITCH_SENS_X,

  			&pitch_x, 0, true);

  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed U1_PITCH_SENS_X (%d)
  ", ret);
  		goto exit;
  	}
  
  	ret = u1_read_write_register(hdev, ADDRESS_U1_PITCH_SENS_Y,

  			&pitch_y, 0, true);

  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed U1_PITCH_SENS_Y (%d)
  ", ret);
  		goto exit;
  	}
  
  	ret = u1_read_write_register(hdev, ADDRESS_U1_RESO_DWN_ABS,

  		&resolution, 0, true);

  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed U1_RESO_DWN_ABS (%d)
  ", ret);
  		goto exit;
  	}

  	pri_data->x_active_len_mm =

  		(pitch_x * (sen_line_num_x - 1)) / 10;

  	pri_data->y_active_len_mm =

  		(pitch_y * (sen_line_num_y - 1)) / 10;

  
  	pri_data->x_max =

  		(resolution << 2) * (sen_line_num_x - 1);

  	pri_data->x_min = 1;

  	pri_data->y_max =

  		(resolution << 2) * (sen_line_num_y - 1);

  	pri_data->y_min = 1;

  
  	ret = u1_read_write_register(hdev, ADDRESS_U1_PAD_BTN,

  			&tmp, 0, true);

  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed U1_PAD_BTN (%d)
  ", ret);
  		goto exit;
  	}

  	if ((tmp & 0x0F) == (tmp & 0xF0) >> 4) {
  		pri_data->btn_cnt = (tmp & 0x0F);

  	} else {
  		/* Button pad */
  		pri_data->btn_cnt = 1;
  	}

  	pri_data->has_sp = 0;

  	/* Check StickPointer device */
  	ret = u1_read_write_register(hdev, ADDRESS_U1_DEVICE_TYP,

  			&tmp, 0, true);

  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed U1_DEVICE_TYP (%d)
  ", ret);
  		goto exit;
  	}

  	if (tmp & U1_DEVTYPE_SP_SUPPORT) {
  		dev_ctrl |= U1_SP_ABS_MODE;

  		ret = u1_read_write_register(hdev, ADDRESS_U1_DEV_CTRL_1,

  			NULL, dev_ctrl, false);

  		if (ret < 0) {
  			dev_err(&hdev->dev, "failed SP mode (%d)
  ", ret);
  			goto exit;
  		}
  
  		ret = u1_read_write_register(hdev, ADDRESS_U1_SP_BTN,
  			&pri_data->sp_btn_info, 0, true);
  		if (ret < 0) {
  			dev_err(&hdev->dev, "failed U1_SP_BTN (%d)
  ", ret);
  			goto exit;
  		}
  		pri_data->has_sp = 1;
  	}

  	pri_data->max_fingers = 5;

  exit:
  	return ret;
  }

  static int T4_init(struct hid_device *hdev, struct alps_dev *pri_data)
  {
  	int ret;
  	u8 tmp, sen_line_num_x, sen_line_num_y;
  
  	ret = t4_read_write_register(hdev, T4_PRM_ID_CONFIG_3, &tmp, 0, true);
  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed T4_PRM_ID_CONFIG_3 (%d)
  ", ret);
  		goto exit;
  	}
  	sen_line_num_x = 16 + ((tmp & 0x0F)  | (tmp & 0x08 ? 0xF0 : 0));
  	sen_line_num_y = 12 + (((tmp & 0xF0) >> 4)  | (tmp & 0x80 ? 0xF0 : 0));
  
  	pri_data->x_max = sen_line_num_x * T4_COUNT_PER_ELECTRODE;
  	pri_data->x_min = T4_COUNT_PER_ELECTRODE;
  	pri_data->y_max = sen_line_num_y * T4_COUNT_PER_ELECTRODE;
  	pri_data->y_min = T4_COUNT_PER_ELECTRODE;
  	pri_data->x_active_len_mm = pri_data->y_active_len_mm = 0;
  	pri_data->btn_cnt = 1;
  
  	ret = t4_read_write_register(hdev, PRM_SYS_CONFIG_1, &tmp, 0, true);
  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed PRM_SYS_CONFIG_1 (%d)
  ", ret);
  		goto exit;
  	}
  	tmp |= 0x02;
  	ret = t4_read_write_register(hdev, PRM_SYS_CONFIG_1, NULL, tmp, false);
  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed PRM_SYS_CONFIG_1 (%d)
  ", ret);
  		goto exit;
  	}
  
  	ret = t4_read_write_register(hdev, T4_PRM_FEED_CONFIG_1,
  					NULL, T4_I2C_ABS, false);
  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed T4_PRM_FEED_CONFIG_1 (%d)
  ", ret);
  		goto exit;
  	}
  
  	ret = t4_read_write_register(hdev, T4_PRM_FEED_CONFIG_4, NULL,
  				T4_FEEDCFG4_ADVANCED_ABS_ENABLE, false);
  	if (ret < 0) {
  		dev_err(&hdev->dev, "failed T4_PRM_FEED_CONFIG_4 (%d)
  ", ret);
  		goto exit;
  	}
  	pri_data->max_fingers = 5;
  	pri_data->has_sp = 0;
  exit:
  	return ret;
  }

  static int alps_sp_open(struct input_dev *dev)
  {
  	struct hid_device *hid = input_get_drvdata(dev);
  
  	return hid_hw_open(hid);
  }
  
  static void alps_sp_close(struct input_dev *dev)
  {
  	struct hid_device *hid = input_get_drvdata(dev);
  
  	hid_hw_close(hid);
  }

  static int alps_input_configured(struct hid_device *hdev, struct hid_input *hi)
  {

  	struct alps_dev *data = hid_get_drvdata(hdev);

  	struct input_dev *input = hi->input, *input2;
  	int ret;
  	int res_x, res_y, i;
  
  	data->input = input;
  
  	hid_dbg(hdev, "Opening low level driver
  ");
  	ret = hid_hw_open(hdev);
  	if (ret)
  		return ret;
  
  	/* Allow incoming hid reports */
  	hid_device_io_start(hdev);

  	switch (data->dev_type) {
  	case T4:
  		ret = T4_init(hdev, data);
  		break;
  	case U1:
  		ret = u1_init(hdev, data);
  		break;
  	default:
  		break;
  	}

  
  	if (ret)
  		goto exit;

  
  	__set_bit(EV_ABS, input->evbit);

  	input_set_abs_params(input, ABS_MT_POSITION_X,
  						data->x_min, data->x_max, 0, 0);
  	input_set_abs_params(input, ABS_MT_POSITION_Y,
  						data->y_min, data->y_max, 0, 0);

  	if (data->x_active_len_mm && data->y_active_len_mm) {
  		res_x = (data->x_max - 1) / data->x_active_len_mm;
  		res_y = (data->y_max - 1) / data->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, data->max_fingers, INPUT_MT_POINTER);

  
  	__set_bit(EV_KEY, input->evbit);

  
  	if (data->btn_cnt == 1)

  		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);

  	for (i = 0; i < data->btn_cnt; i++)

  		__set_bit(BTN_LEFT + i, input->keybit);

  	/* Stick device initialization */

  	if (data->has_sp) {

  		input2 = input_allocate_device();
  		if (!input2) {

  			ret = -ENOMEM;

  			goto exit;
  		}

  		data->input2 = input2;

  		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;

  		input_set_drvdata(input2, hdev);
  		input2->open = alps_sp_open;
  		input2->close = alps_sp_close;

  		__set_bit(EV_KEY, input2->evbit);

  		data->sp_btn_cnt = (data->sp_btn_info & 0x0F);
  		for (i = 0; i < data->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(data->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 alps_dev *data = NULL;

  	int ret;

  	data = devm_kzalloc(&hdev->dev, sizeof(struct alps_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
  ");
  		return ret;
  	}

  	switch (hdev->product) {
  	case HID_DEVICE_ID_ALPS_T4_BTNLESS:
  		data->dev_type = T4;
  		break;
  	case HID_DEVICE_ID_ALPS_U1_DUAL:

  	case HID_DEVICE_ID_ALPS_U1:

  	case HID_DEVICE_ID_ALPS_U1_UNICORN_LEGACY:

  		data->dev_type = U1;
  		break;
  	default:
  		data->dev_type = UNKNOWN;
  	}

  	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
  	if (ret) {
  		hid_err(hdev, "hw start failed
  ");
  		return ret;
  	}
  
  	return 0;
  }
  
  static void alps_remove(struct hid_device *hdev)
  {
  	hid_hw_stop(hdev);

  }
  
  static const struct hid_device_id alps_id[] = {
  	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_ANY,

  		USB_VENDOR_ID_ALPS_JP, HID_DEVICE_ID_ALPS_U1_DUAL) },

  	{ 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_T4_BTNLESS) },

  	{ }
  };
  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");