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

  /*

   *  HID driver for Asus notebook built-in keyboard.

   *  Fixes small logical maximum to match usage maximum.
   *

   *  Currently supported devices are:
   *    EeeBook X205TA
   *    VivoBook E200HA
   *

   *  Copyright (c) 2016 Yusuke Fujimaki <usk.fujimaki@gmail.com>
   *
   *  This module based on hid-ortek by
   *  Copyright (c) 2010 Johnathon Harris <jmharris@gmail.com>
   *  Copyright (c) 2011 Jiri Kosina

   *
   *  This module has been updated to add support for Asus i2c touchpad.
   *
   *  Copyright (c) 2016 Brendan McGrath <redmcg@redmandi.dyndns.org>
   *  Copyright (c) 2016 Victor Vlasenko <victor.vlasenko@sysgears.com>
   *  Copyright (c) 2016 Frederik Wenigwieser <frederik.wenigwieser@gmail.com>

   */
  
  /*

   */

  #include <linux/dmi.h>

  #include <linux/hid.h>
  #include <linux/module.h>

  #include <linux/platform_data/x86/asus-wmi.h>

  #include <linux/input/mt.h>

  #include <linux/usb.h> /* For to_usb_interface for T100 touchpad intf check */

  #include <linux/power_supply.h>

  
  #include "hid-ids.h"

  MODULE_AUTHOR("Yusuke Fujimaki <usk.fujimaki@gmail.com>");
  MODULE_AUTHOR("Brendan McGrath <redmcg@redmandi.dyndns.org>");
  MODULE_AUTHOR("Victor Vlasenko <victor.vlasenko@sysgears.com>");
  MODULE_AUTHOR("Frederik Wenigwieser <frederik.wenigwieser@gmail.com>");
  MODULE_DESCRIPTION("Asus HID Keyboard and TouchPad");

  #define T100_TPAD_INTF 2

  #define T100CHI_MOUSE_REPORT_ID 0x06

  #define FEATURE_REPORT_ID 0x0d
  #define INPUT_REPORT_ID 0x5d

  #define FEATURE_KBD_REPORT_ID 0x5a

  #define FEATURE_KBD_REPORT_SIZE 16
  
  #define SUPPORT_KBD_BACKLIGHT BIT(0)

  #define MAX_TOUCH_MAJOR 8
  #define MAX_PRESSURE 128

  #define BTN_LEFT_MASK 0x01
  #define CONTACT_TOOL_TYPE_MASK 0x80
  #define CONTACT_X_MSB_MASK 0xf0
  #define CONTACT_Y_MSB_MASK 0x0f
  #define CONTACT_TOUCH_MAJOR_MASK 0x07
  #define CONTACT_PRESSURE_MASK 0x7f

  #define	BATTERY_REPORT_ID	(0x03)
  #define	BATTERY_REPORT_SIZE	(1 + 8)
  #define	BATTERY_LEVEL_MAX	((u8)255)
  #define	BATTERY_STAT_DISCONNECT	(0)
  #define	BATTERY_STAT_CHARGING	(1)
  #define	BATTERY_STAT_FULL	(2)

  #define QUIRK_FIX_NOTEBOOK_REPORT	BIT(0)
  #define QUIRK_NO_INIT_REPORTS		BIT(1)
  #define QUIRK_SKIP_INPUT_MAPPING	BIT(2)
  #define QUIRK_IS_MULTITOUCH		BIT(3)

  #define QUIRK_NO_CONSUMER_USAGES	BIT(4)

  #define QUIRK_USE_KBD_BACKLIGHT		BIT(5)

  #define QUIRK_T100_KEYBOARD		BIT(6)

  #define QUIRK_T100CHI			BIT(7)

  #define QUIRK_G752_KEYBOARD		BIT(8)

  #define QUIRK_T101HA_DOCK		BIT(9)

  #define QUIRK_T90CHI			BIT(10)

  #define I2C_KEYBOARD_QUIRKS			(QUIRK_FIX_NOTEBOOK_REPORT | \

  						 QUIRK_NO_INIT_REPORTS | \
  						 QUIRK_NO_CONSUMER_USAGES)

  #define I2C_TOUCHPAD_QUIRKS			(QUIRK_NO_INIT_REPORTS | \

  						 QUIRK_SKIP_INPUT_MAPPING | \
  						 QUIRK_IS_MULTITOUCH)
  
  #define TRKID_SGN       ((TRKID_MAX + 1) >> 1)

  struct asus_kbd_leds {
  	struct led_classdev cdev;
  	struct hid_device *hdev;
  	struct work_struct work;
  	unsigned int brightness;
  	bool removed;
  };

  struct asus_touchpad_info {
  	int max_x;
  	int max_y;

  	int res_x;
  	int res_y;

  	int contact_size;
  	int max_contacts;
  };

  struct asus_drvdata {
  	unsigned long quirks;

  	struct hid_device *hdev;

  	struct input_dev *input;

  	struct asus_kbd_leds *kbd_backlight;

  	const struct asus_touchpad_info *tp;

  	bool enable_backlight;

  	struct power_supply *battery;
  	struct power_supply_desc battery_desc;
  	int battery_capacity;
  	int battery_stat;
  	bool battery_in_query;
  	unsigned long battery_next_query;

  };

  static int asus_report_battery(struct asus_drvdata *, u8 *, int);

  static const struct asus_touchpad_info asus_i2c_tp = {
  	.max_x = 2794,
  	.max_y = 1758,
  	.contact_size = 5,
  	.max_contacts = 5,
  };
  
  static const struct asus_touchpad_info asus_t100ta_tp = {
  	.max_x = 2240,

  	.max_y = 1120,

  	.res_x = 30, /* units/mm */
  	.res_y = 27, /* units/mm */

  	.contact_size = 5,
  	.max_contacts = 5,
  };

  static const struct asus_touchpad_info asus_t100ha_tp = {
  	.max_x = 2640,
  	.max_y = 1320,
  	.res_x = 30, /* units/mm */
  	.res_y = 29, /* units/mm */
  	.contact_size = 5,
  	.max_contacts = 5,
  };

  static const struct asus_touchpad_info asus_t200ta_tp = {
  	.max_x = 3120,
  	.max_y = 1716,
  	.res_x = 30, /* units/mm */
  	.res_y = 28, /* units/mm */
  	.contact_size = 5,
  	.max_contacts = 5,
  };

  static const struct asus_touchpad_info asus_t100chi_tp = {
  	.max_x = 2640,
  	.max_y = 1320,
  	.res_x = 31, /* units/mm */
  	.res_y = 29, /* units/mm */
  	.contact_size = 3,
  	.max_contacts = 4,
  };

  static void asus_report_contact_down(struct asus_drvdata *drvdat,

  		int toolType, u8 *data)
  {

  	struct input_dev *input = drvdat->input;
  	int touch_major, pressure, x, y;
  
  	x = (data[0] & CONTACT_X_MSB_MASK) << 4 | data[1];
  	y = drvdat->tp->max_y - ((data[0] & CONTACT_Y_MSB_MASK) << 8 | data[2]);

  	input_report_abs(input, ABS_MT_POSITION_X, x);
  	input_report_abs(input, ABS_MT_POSITION_Y, y);
  
  	if (drvdat->tp->contact_size < 5)
  		return;

  	if (toolType == MT_TOOL_PALM) {
  		touch_major = MAX_TOUCH_MAJOR;
  		pressure = MAX_PRESSURE;
  	} else {
  		touch_major = (data[3] >> 4) & CONTACT_TOUCH_MAJOR_MASK;
  		pressure = data[4] & CONTACT_PRESSURE_MASK;
  	}

  	input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major);
  	input_report_abs(input, ABS_MT_PRESSURE, pressure);
  }
  
  /* Required for Synaptics Palm Detection */

  static void asus_report_tool_width(struct asus_drvdata *drvdat)

  {

  	struct input_mt *mt = drvdat->input->mt;

  	struct input_mt_slot *oldest;
  	int oldid, count, i;

  	if (drvdat->tp->contact_size < 5)
  		return;

  	oldest = NULL;
  	oldid = mt->trkid;
  	count = 0;
  
  	for (i = 0; i < mt->num_slots; ++i) {
  		struct input_mt_slot *ps = &mt->slots[i];
  		int id = input_mt_get_value(ps, ABS_MT_TRACKING_ID);
  
  		if (id < 0)
  			continue;
  		if ((id - oldid) & TRKID_SGN) {
  			oldest = ps;
  			oldid = id;
  		}
  		count++;
  	}
  
  	if (oldest) {

  		input_report_abs(drvdat->input, ABS_TOOL_WIDTH,

  			input_mt_get_value(oldest, ABS_MT_TOUCH_MAJOR));
  	}
  }

  static int asus_report_input(struct asus_drvdata *drvdat, u8 *data, int size)

  {

  	int i, toolType = MT_TOOL_FINGER;

  	u8 *contactData = data + 2;

  	if (size != 3 + drvdat->tp->contact_size * drvdat->tp->max_contacts)
  		return 0;
  
  	for (i = 0; i < drvdat->tp->max_contacts; i++) {

  		bool down = !!(data[1] & BIT(i+3));

  
  		if (drvdat->tp->contact_size >= 5)
  			toolType = contactData[3] & CONTACT_TOOL_TYPE_MASK ?

  						MT_TOOL_PALM : MT_TOOL_FINGER;

  		input_mt_slot(drvdat->input, i);
  		input_mt_report_slot_state(drvdat->input, toolType, down);

  
  		if (down) {

  			asus_report_contact_down(drvdat, toolType, contactData);
  			contactData += drvdat->tp->contact_size;

  		}
  	}

  	input_report_key(drvdat->input, BTN_LEFT, data[1] & BTN_LEFT_MASK);
  	asus_report_tool_width(drvdat);
  
  	input_mt_sync_frame(drvdat->input);
  	input_sync(drvdat->input);

  	return 1;

  }

  static int asus_event(struct hid_device *hdev, struct hid_field *field,
  		      struct hid_usage *usage, __s32 value)
  {
  	if ((usage->hid & HID_USAGE_PAGE) == 0xff310000 &&

  	    (usage->hid & HID_USAGE) != 0x00 &&
  	    (usage->hid & HID_USAGE) != 0xff && !usage->type) {

  		hid_warn(hdev, "Unmapped Asus vendor usagepage code 0x%02x
  ",
  			 usage->hid & HID_USAGE);
  	}
  
  	return 0;
  }

  static int asus_raw_event(struct hid_device *hdev,
  		struct hid_report *report, u8 *data, int size)
  {
  	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);

  	if (drvdata->battery && data[0] == BATTERY_REPORT_ID)
  		return asus_report_battery(drvdata, data, size);

  	if (drvdata->tp && data[0] == INPUT_REPORT_ID)
  		return asus_report_input(drvdata, data, size);

  
  	return 0;
  }

  static int asus_kbd_set_report(struct hid_device *hdev, u8 *buf, size_t buf_size)
  {
  	unsigned char *dmabuf;
  	int ret;
  
  	dmabuf = kmemdup(buf, buf_size, GFP_KERNEL);
  	if (!dmabuf)
  		return -ENOMEM;
  
  	ret = hid_hw_raw_request(hdev, FEATURE_KBD_REPORT_ID, dmabuf,
  				 buf_size, HID_FEATURE_REPORT,
  				 HID_REQ_SET_REPORT);
  	kfree(dmabuf);
  
  	return ret;
  }
  
  static int asus_kbd_init(struct hid_device *hdev)
  {
  	u8 buf[] = { FEATURE_KBD_REPORT_ID, 0x41, 0x53, 0x55, 0x53, 0x20, 0x54,
  		     0x65, 0x63, 0x68, 0x2e, 0x49, 0x6e, 0x63, 0x2e, 0x00 };
  	int ret;
  
  	ret = asus_kbd_set_report(hdev, buf, sizeof(buf));
  	if (ret < 0)
  		hid_err(hdev, "Asus failed to send init command: %d
  ", ret);
  
  	return ret;
  }
  
  static int asus_kbd_get_functions(struct hid_device *hdev,
  				  unsigned char *kbd_func)
  {
  	u8 buf[] = { FEATURE_KBD_REPORT_ID, 0x05, 0x20, 0x31, 0x00, 0x08 };
  	u8 *readbuf;
  	int ret;
  
  	ret = asus_kbd_set_report(hdev, buf, sizeof(buf));
  	if (ret < 0) {
  		hid_err(hdev, "Asus failed to send configuration command: %d
  ", ret);
  		return ret;
  	}
  
  	readbuf = kzalloc(FEATURE_KBD_REPORT_SIZE, GFP_KERNEL);
  	if (!readbuf)
  		return -ENOMEM;
  
  	ret = hid_hw_raw_request(hdev, FEATURE_KBD_REPORT_ID, readbuf,
  				 FEATURE_KBD_REPORT_SIZE, HID_FEATURE_REPORT,
  				 HID_REQ_GET_REPORT);
  	if (ret < 0) {
  		hid_err(hdev, "Asus failed to request functions: %d
  ", ret);
  		kfree(readbuf);
  		return ret;
  	}
  
  	*kbd_func = readbuf[6];
  
  	kfree(readbuf);
  	return ret;
  }
  
  static void asus_kbd_backlight_set(struct led_classdev *led_cdev,
  				   enum led_brightness brightness)
  {
  	struct asus_kbd_leds *led = container_of(led_cdev, struct asus_kbd_leds,
  						 cdev);
  	if (led->brightness == brightness)
  		return;
  
  	led->brightness = brightness;
  	schedule_work(&led->work);
  }
  
  static enum led_brightness asus_kbd_backlight_get(struct led_classdev *led_cdev)
  {
  	struct asus_kbd_leds *led = container_of(led_cdev, struct asus_kbd_leds,
  						 cdev);
  
  	return led->brightness;
  }
  
  static void asus_kbd_backlight_work(struct work_struct *work)
  {
  	struct asus_kbd_leds *led = container_of(work, struct asus_kbd_leds, work);
  	u8 buf[] = { FEATURE_KBD_REPORT_ID, 0xba, 0xc5, 0xc4, 0x00 };
  	int ret;
  
  	if (led->removed)
  		return;
  
  	buf[4] = led->brightness;
  
  	ret = asus_kbd_set_report(led->hdev, buf, sizeof(buf));
  	if (ret < 0)
  		hid_err(led->hdev, "Asus failed to set keyboard backlight: %d
  ", ret);
  }

  /* WMI-based keyboard backlight LED control (via asus-wmi driver) takes
   * precedence. We only activate HID-based backlight control when the
   * WMI control is not available.
   */
  static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev)
  {
  	u32 value;
  	int ret;

  	if (!IS_ENABLED(CONFIG_ASUS_WMI))
  		return false;

  	ret = asus_wmi_evaluate_method(ASUS_WMI_METHODID_DSTS,

  				       ASUS_WMI_DEVID_KBD_BACKLIGHT, 0, &value);
  	hid_dbg(hdev, "WMI backlight check: rc %d value %x", ret, value);
  	if (ret)
  		return false;
  
  	return !!(value & ASUS_WMI_DSTS_PRESENCE_BIT);
  }

  static int asus_kbd_register_leds(struct hid_device *hdev)
  {
  	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
  	unsigned char kbd_func;
  	int ret;
  
  	/* Initialize keyboard */
  	ret = asus_kbd_init(hdev);
  	if (ret < 0)
  		return ret;
  
  	/* Get keyboard functions */
  	ret = asus_kbd_get_functions(hdev, &kbd_func);
  	if (ret < 0)
  		return ret;
  
  	/* Check for backlight support */
  	if (!(kbd_func & SUPPORT_KBD_BACKLIGHT))
  		return -ENODEV;
  
  	drvdata->kbd_backlight = devm_kzalloc(&hdev->dev,
  					      sizeof(struct asus_kbd_leds),
  					      GFP_KERNEL);
  	if (!drvdata->kbd_backlight)
  		return -ENOMEM;
  
  	drvdata->kbd_backlight->removed = false;
  	drvdata->kbd_backlight->brightness = 0;
  	drvdata->kbd_backlight->hdev = hdev;
  	drvdata->kbd_backlight->cdev.name = "asus::kbd_backlight";
  	drvdata->kbd_backlight->cdev.max_brightness = 3;
  	drvdata->kbd_backlight->cdev.brightness_set = asus_kbd_backlight_set;
  	drvdata->kbd_backlight->cdev.brightness_get = asus_kbd_backlight_get;
  	INIT_WORK(&drvdata->kbd_backlight->work, asus_kbd_backlight_work);
  
  	ret = devm_led_classdev_register(&hdev->dev, &drvdata->kbd_backlight->cdev);
  	if (ret < 0) {
  		/* No need to have this still around */
  		devm_kfree(&hdev->dev, drvdata->kbd_backlight);
  	}
  
  	return ret;
  }

  /*
   * [0]       REPORT_ID (same value defined in report descriptor)
   * [1]	     rest battery level. range [0..255]
   * [2]..[7]  Bluetooth hardware address (MAC address)
   * [8]       charging status
   *            = 0 : AC offline / discharging
   *            = 1 : AC online  / charging
   *            = 2 : AC online  / fully charged
   */
  static int asus_parse_battery(struct asus_drvdata *drvdata, u8 *data, int size)
  {
  	u8 sts;
  	u8 lvl;
  	int val;
  
  	lvl = data[1];
  	sts = data[8];
  
  	drvdata->battery_capacity = ((int)lvl * 100) / (int)BATTERY_LEVEL_MAX;
  
  	switch (sts) {
  	case BATTERY_STAT_CHARGING:
  		val = POWER_SUPPLY_STATUS_CHARGING;
  		break;
  	case BATTERY_STAT_FULL:
  		val = POWER_SUPPLY_STATUS_FULL;
  		break;
  	case BATTERY_STAT_DISCONNECT:
  	default:
  		val = POWER_SUPPLY_STATUS_DISCHARGING;
  		break;
  	}
  	drvdata->battery_stat = val;
  
  	return 0;
  }
  
  static int asus_report_battery(struct asus_drvdata *drvdata, u8 *data, int size)
  {
  	/* notify only the autonomous event by device */
  	if ((drvdata->battery_in_query == false) &&
  			 (size == BATTERY_REPORT_SIZE))
  		power_supply_changed(drvdata->battery);
  
  	return 0;
  }
  
  static int asus_battery_query(struct asus_drvdata *drvdata)
  {
  	u8 *buf;
  	int ret = 0;
  
  	buf = kmalloc(BATTERY_REPORT_SIZE, GFP_KERNEL);
  	if (!buf)
  		return -ENOMEM;
  
  	drvdata->battery_in_query = true;
  	ret = hid_hw_raw_request(drvdata->hdev, BATTERY_REPORT_ID,
  				buf, BATTERY_REPORT_SIZE,
  				HID_INPUT_REPORT, HID_REQ_GET_REPORT);
  	drvdata->battery_in_query = false;
  	if (ret == BATTERY_REPORT_SIZE)
  		ret = asus_parse_battery(drvdata, buf, BATTERY_REPORT_SIZE);
  	else
  		ret = -ENODATA;
  
  	kfree(buf);
  
  	return ret;
  }
  
  static enum power_supply_property asus_battery_props[] = {
  	POWER_SUPPLY_PROP_STATUS,
  	POWER_SUPPLY_PROP_PRESENT,
  	POWER_SUPPLY_PROP_CAPACITY,
  	POWER_SUPPLY_PROP_SCOPE,
  	POWER_SUPPLY_PROP_MODEL_NAME,
  };
  
  #define	QUERY_MIN_INTERVAL	(60 * HZ)	/* 60[sec] */
  
  static int asus_battery_get_property(struct power_supply *psy,
  				enum power_supply_property psp,
  				union power_supply_propval *val)
  {
  	struct asus_drvdata *drvdata = power_supply_get_drvdata(psy);
  	int ret = 0;
  
  	switch (psp) {
  	case POWER_SUPPLY_PROP_STATUS:
  	case POWER_SUPPLY_PROP_CAPACITY:
  		if (time_before(drvdata->battery_next_query, jiffies)) {
  			drvdata->battery_next_query =
  					 jiffies + QUERY_MIN_INTERVAL;
  			ret = asus_battery_query(drvdata);
  			if (ret)
  				return ret;
  		}
  		if (psp == POWER_SUPPLY_PROP_STATUS)
  			val->intval = drvdata->battery_stat;
  		else
  			val->intval = drvdata->battery_capacity;
  		break;
  	case POWER_SUPPLY_PROP_PRESENT:
  		val->intval = 1;
  		break;
  	case POWER_SUPPLY_PROP_SCOPE:
  		val->intval = POWER_SUPPLY_SCOPE_DEVICE;
  		break;
  	case POWER_SUPPLY_PROP_MODEL_NAME:
  		val->strval = drvdata->hdev->name;
  		break;
  	default:
  		ret = -EINVAL;
  		break;
  	}
  
  	return ret;
  }
  
  static int asus_battery_probe(struct hid_device *hdev)
  {
  	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
  	struct power_supply_config pscfg = { .drv_data = drvdata };
  	int ret = 0;
  
  	drvdata->battery_capacity = 0;
  	drvdata->battery_stat = POWER_SUPPLY_STATUS_UNKNOWN;
  	drvdata->battery_in_query = false;
  
  	drvdata->battery_desc.properties = asus_battery_props;
  	drvdata->battery_desc.num_properties = ARRAY_SIZE(asus_battery_props);
  	drvdata->battery_desc.get_property = asus_battery_get_property;
  	drvdata->battery_desc.type = POWER_SUPPLY_TYPE_BATTERY;
  	drvdata->battery_desc.use_for_apm = 0;
  	drvdata->battery_desc.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
  					"asus-keyboard-%s-battery",
  					strlen(hdev->uniq) ?
  					hdev->uniq : dev_name(&hdev->dev));
  	if (!drvdata->battery_desc.name)
  		return -ENOMEM;
  
  	drvdata->battery_next_query = jiffies;
  
  	drvdata->battery = devm_power_supply_register(&hdev->dev,
  				&(drvdata->battery_desc), &pscfg);
  	if (IS_ERR(drvdata->battery)) {
  		ret = PTR_ERR(drvdata->battery);
  		drvdata->battery = NULL;
  		hid_err(hdev, "Unable to register battery device
  ");
  		return ret;
  	}
  
  	power_supply_powers(drvdata->battery, &hdev->dev);
  
  	return ret;
  }

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

  	struct input_dev *input = hi->input;

  	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);

  	/* T100CHI uses MULTI_INPUT, bind the touchpad to the mouse hid_input */
  	if (drvdata->quirks & QUIRK_T100CHI &&
  	    hi->report->id != T100CHI_MOUSE_REPORT_ID)
  		return 0;

  	if (drvdata->tp) {

  		int ret;

  		input_set_abs_params(input, ABS_MT_POSITION_X, 0,
  				     drvdata->tp->max_x, 0, 0);
  		input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
  				     drvdata->tp->max_y, 0, 0);

  		input_abs_set_res(input, ABS_MT_POSITION_X, drvdata->tp->res_x);
  		input_abs_set_res(input, ABS_MT_POSITION_Y, drvdata->tp->res_y);

  
  		if (drvdata->tp->contact_size >= 5) {
  			input_set_abs_params(input, ABS_TOOL_WIDTH, 0,
  					     MAX_TOUCH_MAJOR, 0, 0);
  			input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
  					     MAX_TOUCH_MAJOR, 0, 0);
  			input_set_abs_params(input, ABS_MT_PRESSURE, 0,
  					      MAX_PRESSURE, 0, 0);
  		}

  
  		__set_bit(BTN_LEFT, input->keybit);
  		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);

  		ret = input_mt_init_slots(input, drvdata->tp->max_contacts,
  					  INPUT_MT_POINTER);

  
  		if (ret) {
  			hid_err(hdev, "Asus input mt init slots failed: %d
  ", ret);
  			return ret;
  		}

  	}

  	drvdata->input = input;

  	if (drvdata->enable_backlight &&
  	    !asus_kbd_wmi_led_control_present(hdev) &&
  	    asus_kbd_register_leds(hdev))

  		hid_warn(hdev, "Failed to initialize backlight.
  ");

  	return 0;
  }

  #define asus_map_key_clear(c)	hid_map_usage_clear(hi, usage, bit, \

  						    max, EV_KEY, (c))

  static int asus_input_mapping(struct hid_device *hdev,
  		struct hid_input *hi, struct hid_field *field,
  		struct hid_usage *usage, unsigned long **bit,
  		int *max)
  {
  	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
  
  	if (drvdata->quirks & QUIRK_SKIP_INPUT_MAPPING) {
  		/* Don't map anything from the HID report.
  		 * We do it all manually in asus_input_configured
  		 */
  		return -1;
  	}

  	/*
  	 * Ignore a bunch of bogus collections in the T100CHI descriptor.
  	 * This avoids a bunch of non-functional hid_input devices getting
  	 * created because of the T100CHI using HID_QUIRK_MULTI_INPUT.
  	 */

  	if (drvdata->quirks & (QUIRK_T100CHI | QUIRK_T90CHI)) {

  		if (field->application == (HID_UP_GENDESK | 0x0080) ||
  		    usage->hid == (HID_UP_GENDEVCTRLS | 0x0024) ||
  		    usage->hid == (HID_UP_GENDEVCTRLS | 0x0025) ||
  		    usage->hid == (HID_UP_GENDEVCTRLS | 0x0026))
  			return -1;
  		/*
  		 * We use the hid_input for the mouse report for the touchpad,
  		 * keep the left button, to avoid the core removing it.
  		 */
  		if (field->application == HID_GD_MOUSE &&
  		    usage->hid != (HID_UP_BUTTON | 1))
  			return -1;
  	}

  	/* ASUS-specific keyboard hotkeys */

  	if ((usage->hid & HID_USAGE_PAGE) == 0xff310000) {
  		set_bit(EV_REP, hi->input->evbit);
  		switch (usage->hid & HID_USAGE) {

  		case 0x10: asus_map_key_clear(KEY_BRIGHTNESSDOWN);	break;
  		case 0x20: asus_map_key_clear(KEY_BRIGHTNESSUP);		break;
  		case 0x35: asus_map_key_clear(KEY_DISPLAY_OFF);		break;
  		case 0x6c: asus_map_key_clear(KEY_SLEEP);		break;

  		case 0x7c: asus_map_key_clear(KEY_MICMUTE);		break;

  		case 0x82: asus_map_key_clear(KEY_CAMERA);		break;

  		case 0x88: asus_map_key_clear(KEY_RFKILL);			break;

  		case 0xb5: asus_map_key_clear(KEY_CALC);			break;
  		case 0xc4: asus_map_key_clear(KEY_KBDILLUMUP);		break;
  		case 0xc5: asus_map_key_clear(KEY_KBDILLUMDOWN);		break;

  
  		/* ASUS touchpad toggle */

  		case 0x6b: asus_map_key_clear(KEY_F21);			break;

  
  		/* ROG key */

  		case 0x38: asus_map_key_clear(KEY_PROG1);		break;

  
  		/* Fn+C ASUS Splendid */

  		case 0xba: asus_map_key_clear(KEY_PROG2);		break;

  
  		/* Fn+Space Power4Gear Hybrid */

  		case 0x5c: asus_map_key_clear(KEY_PROG3);		break;

  		/* Fn+F5 "fan" symbol on FX503VD */
  		case 0x99: asus_map_key_clear(KEY_PROG4);		break;

  		default:

  			/* ASUS lazily declares 256 usages, ignore the rest,
  			 * as some make the keyboard appear as a pointer device. */
  			return -1;

  		}

  
  		/*
  		 * Check and enable backlight only on devices with UsagePage ==
  		 * 0xff31 to avoid initializing the keyboard firmware multiple
  		 * times on devices with multiple HID descriptors but same
  		 * PID/VID.
  		 */
  		if (drvdata->quirks & QUIRK_USE_KBD_BACKLIGHT)
  			drvdata->enable_backlight = true;

  		return 1;
  	}

  	if ((usage->hid & HID_USAGE_PAGE) == HID_UP_MSVENDOR) {
  		set_bit(EV_REP, hi->input->evbit);
  		switch (usage->hid & HID_USAGE) {
  		case 0xff01: asus_map_key_clear(BTN_1);	break;
  		case 0xff02: asus_map_key_clear(BTN_2);	break;
  		case 0xff03: asus_map_key_clear(BTN_3);	break;
  		case 0xff04: asus_map_key_clear(BTN_4);	break;
  		case 0xff05: asus_map_key_clear(BTN_5);	break;
  		case 0xff06: asus_map_key_clear(BTN_6);	break;
  		case 0xff07: asus_map_key_clear(BTN_7);	break;
  		case 0xff08: asus_map_key_clear(BTN_8);	break;
  		case 0xff09: asus_map_key_clear(BTN_9);	break;
  		case 0xff0a: asus_map_key_clear(BTN_A);	break;
  		case 0xff0b: asus_map_key_clear(BTN_B);	break;
  		case 0x00f1: asus_map_key_clear(KEY_WLAN);	break;
  		case 0x00f2: asus_map_key_clear(KEY_BRIGHTNESSDOWN);	break;
  		case 0x00f3: asus_map_key_clear(KEY_BRIGHTNESSUP);	break;
  		case 0x00f4: asus_map_key_clear(KEY_DISPLAY_OFF);	break;
  		case 0x00f7: asus_map_key_clear(KEY_CAMERA);	break;
  		case 0x00f8: asus_map_key_clear(KEY_PROG1);	break;
  		default:
  			return 0;
  		}
  
  		return 1;
  	}

  	if (drvdata->quirks & QUIRK_NO_CONSUMER_USAGES &&
  		(usage->hid & HID_USAGE_PAGE) == HID_UP_CONSUMER) {
  		switch (usage->hid & HID_USAGE) {
  		case 0xe2: /* Mute */
  		case 0xe9: /* Volume up */
  		case 0xea: /* Volume down */
  			return 0;
  		default:
  			/* Ignore dummy Consumer usages which make the
  			 * keyboard incorrectly appear as a pointer device.
  			 */
  			return -1;
  		}
  	}

  	return 0;
  }
  
  static int asus_start_multitouch(struct hid_device *hdev)
  {
  	int ret;

  	static const unsigned char buf[] = {
  		FEATURE_REPORT_ID, 0x00, 0x03, 0x01, 0x00
  	};

  	unsigned char *dmabuf = kmemdup(buf, sizeof(buf), GFP_KERNEL);
  
  	if (!dmabuf) {
  		ret = -ENOMEM;
  		hid_err(hdev, "Asus failed to alloc dma buf: %d
  ", ret);
  		return ret;
  	}
  
  	ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, sizeof(buf),
  					HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
  
  	kfree(dmabuf);
  
  	if (ret != sizeof(buf)) {
  		hid_err(hdev, "Asus failed to start multitouch: %d
  ", ret);
  		return ret;
  	}
  
  	return 0;
  }
  
  static int __maybe_unused asus_reset_resume(struct hid_device *hdev)
  {
  	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);

  	if (drvdata->tp)

  		return asus_start_multitouch(hdev);
  
  	return 0;
  }
  
  static int asus_probe(struct hid_device *hdev, const struct hid_device_id *id)
  {
  	int ret;
  	struct asus_drvdata *drvdata;
  
  	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
  	if (drvdata == NULL) {
  		hid_err(hdev, "Can't alloc Asus descriptor
  ");
  		return -ENOMEM;
  	}
  
  	hid_set_drvdata(hdev, drvdata);
  
  	drvdata->quirks = id->driver_data;

  	/*
  	 * T90CHI's keyboard dock returns same ID values as T100CHI's dock.
  	 * Thus, identify T90CHI dock with product name string.
  	 */

  	if (strstr(hdev->name, "T90CHI")) {
  		drvdata->quirks &= ~QUIRK_T100CHI;
  		drvdata->quirks |= QUIRK_T90CHI;
  	}

  	if (drvdata->quirks & QUIRK_IS_MULTITOUCH)
  		drvdata->tp = &asus_i2c_tp;

  	if (drvdata->quirks & QUIRK_T100_KEYBOARD) {
  		struct usb_interface *intf = to_usb_interface(hdev->dev.parent);

  		if (intf->altsetting->desc.bInterfaceNumber == T100_TPAD_INTF) {
  			drvdata->quirks = QUIRK_SKIP_INPUT_MAPPING;

  			/*

  			 * The T100HA uses the same USB-ids as the T100TAF and
  			 * the T200TA uses the same USB-ids as the T100TA, while
  			 * both have different max x/y values as the T100TA[F].

  			 */
  			if (dmi_match(DMI_PRODUCT_NAME, "T100HAN"))
  				drvdata->tp = &asus_t100ha_tp;

  			else if (dmi_match(DMI_PRODUCT_NAME, "T200TA"))
  				drvdata->tp = &asus_t200ta_tp;

  			else
  				drvdata->tp = &asus_t100ta_tp;

  		}

  	}

  	if (drvdata->quirks & QUIRK_T100CHI) {
  		/*
  		 * All functionality is on a single HID interface and for
  		 * userspace the touchpad must be a separate input_dev.
  		 */

  		hdev->quirks |= HID_QUIRK_MULTI_INPUT;

  		drvdata->tp = &asus_t100chi_tp;
  	}

  	if (drvdata->quirks & QUIRK_NO_INIT_REPORTS)
  		hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;

  	drvdata->hdev = hdev;
  
  	if (drvdata->quirks & (QUIRK_T100CHI | QUIRK_T90CHI)) {
  		ret = asus_battery_probe(hdev);
  		if (ret) {
  			hid_err(hdev,
  			    "Asus hid battery_probe failed: %d
  ", ret);
  			return ret;
  		}
  	}

  	ret = hid_parse(hdev);
  	if (ret) {
  		hid_err(hdev, "Asus hid parse failed: %d
  ", ret);
  		return ret;
  	}

  	/* use hid-multitouch for T101HA touchpad */
  	if (id->driver_data & QUIRK_T101HA_DOCK &&
  	    hdev->collection->usage == HID_GD_MOUSE)
  		return -ENODEV;

  	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
  	if (ret) {
  		hid_err(hdev, "Asus hw start failed: %d
  ", ret);
  		return ret;
  	}
  
  	if (!drvdata->input) {
  		hid_err(hdev, "Asus input not registered
  ");
  		ret = -ENOMEM;
  		goto err_stop_hw;
  	}

  	if (drvdata->tp) {

  		drvdata->input->name = "Asus TouchPad";
  	} else {
  		drvdata->input->name = "Asus Keyboard";
  	}

  	if (drvdata->tp) {

  		ret = asus_start_multitouch(hdev);
  		if (ret)
  			goto err_stop_hw;
  	}
  
  	return 0;
  err_stop_hw:
  	hid_hw_stop(hdev);
  	return ret;
  }

  static void asus_remove(struct hid_device *hdev)
  {
  	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
  
  	if (drvdata->kbd_backlight) {
  		drvdata->kbd_backlight->removed = true;
  		cancel_work_sync(&drvdata->kbd_backlight->work);
  	}

  
  	hid_hw_stop(hdev);

  }

  static const __u8 asus_g752_fixed_rdesc[] = {
          0x19, 0x00,			/*   Usage Minimum (0x00)       */
          0x2A, 0xFF, 0x00,		/*   Usage Maximum (0xFF)       */
  };

  static __u8 *asus_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  		unsigned int *rsize)
  {

  	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
  
  	if (drvdata->quirks & QUIRK_FIX_NOTEBOOK_REPORT &&
  			*rsize >= 56 && rdesc[54] == 0x25 && rdesc[55] == 0x65) {

  		hid_info(hdev, "Fixing up Asus notebook report descriptor
  ");

  		rdesc[55] = 0xdd;
  	}

  	/* For the T100TA/T200TA keyboard dock */

  	if (drvdata->quirks & QUIRK_T100_KEYBOARD &&

  		 (*rsize == 76 || *rsize == 101) &&
  		 rdesc[73] == 0x81 && rdesc[74] == 0x01) {

  		hid_info(hdev, "Fixing up Asus T100 keyb report descriptor
  ");
  		rdesc[74] &= ~HID_MAIN_ITEM_CONSTANT;
  	}

  	/* For the T100CHI/T90CHI keyboard dock */
  	if (drvdata->quirks & (QUIRK_T100CHI | QUIRK_T90CHI)) {
  		int rsize_orig;
  		int offs;
  
  		if (drvdata->quirks & QUIRK_T100CHI) {
  			rsize_orig = 403;
  			offs = 388;
  		} else {
  			rsize_orig = 306;
  			offs = 291;
  		}

  		/*
  		 * Change Usage (76h) to Usage Minimum (00h), Usage Maximum
  		 * (FFh) and clear the flags in the Input() byte.
  		 * Note the descriptor has a bogus 0 byte at the end so we
  		 * only need 1 extra byte.
  		 */

  		if (*rsize == rsize_orig &&
  			rdesc[offs] == 0x09 && rdesc[offs + 1] == 0x76) {
  			*rsize = rsize_orig + 1;
  			rdesc = kmemdup(rdesc, *rsize, GFP_KERNEL);
  			if (!rdesc)
  				return NULL;
  
  			hid_info(hdev, "Fixing up %s keyb report descriptor
  ",
  				drvdata->quirks & QUIRK_T100CHI ?
  				"T100CHI" : "T90CHI");
  			memmove(rdesc + offs + 4, rdesc + offs + 2, 12);
  			rdesc[offs] = 0x19;
  			rdesc[offs + 1] = 0x00;
  			rdesc[offs + 2] = 0x29;
  			rdesc[offs + 3] = 0xff;
  			rdesc[offs + 14] = 0x00;
  		}

  	}

  	if (drvdata->quirks & QUIRK_G752_KEYBOARD &&
  		 *rsize == 75 && rdesc[61] == 0x15 && rdesc[62] == 0x00) {
  		/* report is missing usage mninum and maximum */
  		__u8 *new_rdesc;
  		size_t new_size = *rsize + sizeof(asus_g752_fixed_rdesc);
  
  		new_rdesc = devm_kzalloc(&hdev->dev, new_size, GFP_KERNEL);
  		if (new_rdesc == NULL)
  			return rdesc;
  
  		hid_info(hdev, "Fixing up Asus G752 keyb report descriptor
  ");
  		/* copy the valid part */
  		memcpy(new_rdesc, rdesc, 61);
  		/* insert missing part */
  		memcpy(new_rdesc + 61, asus_g752_fixed_rdesc, sizeof(asus_g752_fixed_rdesc));
  		/* copy remaining data */
  		memcpy(new_rdesc + 61 + sizeof(asus_g752_fixed_rdesc), rdesc + 61, *rsize - 61);
  
  		*rsize = new_size;
  		rdesc = new_rdesc;
  	}

  	return rdesc;
  }
  
  static const struct hid_device_id asus_devices[] = {

  	{ HID_I2C_DEVICE(USB_VENDOR_ID_ASUSTEK,

  		USB_DEVICE_ID_ASUSTEK_I2C_KEYBOARD), I2C_KEYBOARD_QUIRKS},

  	{ HID_I2C_DEVICE(USB_VENDOR_ID_ASUSTEK,

  		USB_DEVICE_ID_ASUSTEK_I2C_TOUCHPAD), I2C_TOUCHPAD_QUIRKS },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,

  		USB_DEVICE_ID_ASUSTEK_ROG_KEYBOARD1), QUIRK_USE_KBD_BACKLIGHT },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,

  		USB_DEVICE_ID_ASUSTEK_ROG_KEYBOARD2), QUIRK_USE_KBD_BACKLIGHT },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,

  		USB_DEVICE_ID_ASUSTEK_ROG_KEYBOARD3), QUIRK_G752_KEYBOARD },
  	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,

  		USB_DEVICE_ID_ASUSTEK_FX503VD_KEYBOARD),
  	  QUIRK_USE_KBD_BACKLIGHT },
  	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,

  		USB_DEVICE_ID_ASUSTEK_T100TA_KEYBOARD),
  	  QUIRK_T100_KEYBOARD | QUIRK_NO_CONSUMER_USAGES },
  	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,
  		USB_DEVICE_ID_ASUSTEK_T100TAF_KEYBOARD),

  	  QUIRK_T100_KEYBOARD | QUIRK_NO_CONSUMER_USAGES },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,
  		USB_DEVICE_ID_ASUSTEK_T101HA_KEYBOARD), QUIRK_T101HA_DOCK },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_ASUS_AK1D) },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_TURBOX, USB_DEVICE_ID_ASUS_MD_5110) },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_JESS, USB_DEVICE_ID_ASUS_MD_5112) },

  	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ASUSTEK,
  		USB_DEVICE_ID_ASUSTEK_T100CHI_KEYBOARD), QUIRK_T100CHI },

  	{ }
  };
  MODULE_DEVICE_TABLE(hid, asus_devices);
  
  static struct hid_driver asus_driver = {

  	.name			= "asus",
  	.id_table		= asus_devices,
  	.report_fixup		= asus_report_fixup,
  	.probe                  = asus_probe,

  	.remove			= asus_remove,

  	.input_mapping          = asus_input_mapping,
  	.input_configured       = asus_input_configured,
  #ifdef CONFIG_PM
  	.reset_resume           = asus_reset_resume,
  #endif

  	.event			= asus_event,

  	.raw_event		= asus_raw_event

  };
  module_hid_driver(asus_driver);
  
  MODULE_LICENSE("GPL");