[linux-2.6-block.git] / drivers / hid / hid-elan.c

/*
 * HID Driver for ELAN Touchpad
 *
 * Currently only supports touchpad found on HP Pavilion X2 10
 *
 * Copyright (c) 2016 Alexandrov Stanislav <neko@nya.ai>
 *
 * 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/hid.h>
#include <linux/input/mt.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/usb.h>

#include "hid-ids.h"

#define ELAN_MT_I2C		0x5d
#define ELAN_SINGLE_FINGER	0x81
#define ELAN_MT_FIRST_FINGER	0x82
#define ELAN_MT_SECOND_FINGER	0x83
#define ELAN_INPUT_REPORT_SIZE	8
#define ELAN_I2C_REPORT_SIZE	32
#define ELAN_FINGER_DATA_LEN	5
#define ELAN_MAX_FINGERS	5
#define ELAN_MAX_PRESSURE	255
#define ELAN_TP_USB_INTF	1

#define ELAN_FEATURE_REPORT	0x0d
#define ELAN_FEATURE_SIZE	5
#define ELAN_PARAM_MAX_X	6
#define ELAN_PARAM_MAX_Y	7
#define ELAN_PARAM_RES		8

#define ELAN_MUTE_LED_REPORT	0xBC
#define ELAN_LED_REPORT_SIZE	8

#define ELAN_HAS_LED		BIT(0)

struct elan_drvdata {
	struct input_dev *input;
	u8 prev_report[ELAN_INPUT_REPORT_SIZE];
	struct led_classdev mute_led;
	u8 mute_led_state;
	u16 max_x;
	u16 max_y;
	u16 res_x;
	u16 res_y;
};

static int is_not_elan_touchpad(struct hid_device *hdev)
{
	if (hdev->bus == BUS_USB) {
		struct usb_interface *intf = to_usb_interface(hdev->dev.parent);

		return (intf->altsetting->desc.bInterfaceNumber !=
			ELAN_TP_USB_INTF);
	}

	return 0;
}

static int elan_input_mapping(struct hid_device *hdev, struct hid_input *hi,
			      struct hid_field *field, struct hid_usage *usage,
			      unsigned long **bit, int *max)
{
	if (is_not_elan_touchpad(hdev))
		return 0;

	if (field->report->id == ELAN_SINGLE_FINGER ||
	    field->report->id == ELAN_MT_FIRST_FINGER ||
	    field->report->id == ELAN_MT_SECOND_FINGER ||
	    field->report->id == ELAN_MT_I2C)
		return -1;

	return 0;
}

static int elan_get_device_param(struct hid_device *hdev,
				 unsigned char *dmabuf, unsigned char param)
{
	int ret;

	dmabuf[0] = ELAN_FEATURE_REPORT;
	dmabuf[1] = 0x05;
	dmabuf[2] = 0x03;
	dmabuf[3] = param;
	dmabuf[4] = 0x01;

	ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,
				 ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,
				 HID_REQ_SET_REPORT);
	if (ret != ELAN_FEATURE_SIZE) {
		hid_err(hdev, "Set report error for parm %d: %d\n", param, ret);
		return ret;
	}

	ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,
				 ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,
				 HID_REQ_GET_REPORT);
	if (ret != ELAN_FEATURE_SIZE) {
		hid_err(hdev, "Get report error for parm %d: %d\n", param, ret);
		return ret;
	}

	return 0;
}

static unsigned int elan_convert_res(char val)
{
	/*
	 * (value from firmware) * 10 + 790 = dpi
	 * dpi * 10 / 254 = dots/mm
	 */
	return (val * 10 + 790) * 10 / 254;
}

static int elan_get_device_params(struct hid_device *hdev)
{
	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	unsigned char *dmabuf;
	int ret;

	dmabuf = kmalloc(ELAN_FEATURE_SIZE, GFP_KERNEL);
	if (!dmabuf)
		return -ENOMEM;

	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_X);
	if (ret)
		goto err;

	drvdata->max_x = (dmabuf[4] << 8) | dmabuf[3];

	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_Y);
	if (ret)
		goto err;

	drvdata->max_y = (dmabuf[4] << 8) | dmabuf[3];

	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_RES);
	if (ret)
		goto err;

	drvdata->res_x = elan_convert_res(dmabuf[3]);
	drvdata->res_y = elan_convert_res(dmabuf[4]);

err:
	kfree(dmabuf);
	return ret;
}

static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi)
{
	int ret;
	struct input_dev *input;
	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);

	if (is_not_elan_touchpad(hdev))
		return 0;

	ret = elan_get_device_params(hdev);
	if (ret)
		return ret;

	input = devm_input_allocate_device(&hdev->dev);
	if (!input)
		return -ENOMEM;

	input->name = "Elan Touchpad";
	input->phys = hdev->phys;
	input->uniq = hdev->uniq;
	input->id.bustype = hdev->bus;
	input->id.vendor  = hdev->vendor;
	input->id.product = hdev->product;
	input->id.version = hdev->version;
	input->dev.parent = &hdev->dev;

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

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

	ret = input_mt_init_slots(input, ELAN_MAX_FINGERS, INPUT_MT_POINTER);
	if (ret) {
		hid_err(hdev, "Failed to init elan MT slots: %d\n", ret);
		return ret;
	}

	input_abs_set_res(input, ABS_X, drvdata->res_x);
	input_abs_set_res(input, ABS_Y, drvdata->res_y);

	ret = input_register_device(input);
	if (ret) {
		hid_err(hdev, "Failed to register elan input device: %d\n",
			ret);
		input_free_device(input);
		return ret;
	}

	drvdata->input = input;

	return 0;
}

static void elan_report_mt_slot(struct elan_drvdata *drvdata, u8 *data,
				unsigned int slot_num)
{
	struct input_dev *input = drvdata->input;
	int x, y, p;

	bool active = !!data;

	input_mt_slot(input, slot_num);
	input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
	if (active) {
		x = ((data[0] & 0xF0) << 4) | data[1];
		y = drvdata->max_y -
		    (((data[0] & 0x07) << 8) | data[2]);
		p = data[4];

		input_report_abs(input, ABS_MT_POSITION_X, x);
		input_report_abs(input, ABS_MT_POSITION_Y, y);
		input_report_abs(input, ABS_MT_PRESSURE, p);
	}
}

static void elan_usb_report_input(struct elan_drvdata *drvdata, u8 *data)
{
	int i;
	struct input_dev *input = drvdata->input;

	/*
	 * There is 3 types of reports: for single touch,
	 * for multitouch - first finger and for multitouch - second finger
	 *
	 * packet structure for ELAN_SINGLE_FINGER and ELAN_MT_FIRST_FINGER:
	 *
	 * byte 1: 1   0   0   0   0   0   0   1  // 0x81 or 0x82
	 * byte 2: 0   0   0   0   0   0   0   0  // looks like unused
	 * byte 3: f5  f4  f3  f2  f1  0   0   L
	 * byte 4: x12 x11 x10 x9  0?  y11 y10 y9
	 * byte 5: x8  x7  x6  x5  x4  x3  x2  x1
	 * byte 6: y8  y7  y6  y5  y4  y3  y2  y1
	 * byte 7: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
	 * byte 8: p8  p7  p6  p5  p4  p3  p2  p1
	 *
	 * packet structure for ELAN_MT_SECOND_FINGER:
	 *
	 * byte 1: 1   0   0   0   0   0   1   1  // 0x83
	 * byte 2: x12 x11 x10 x9  0   y11 y10 y9
	 * byte 3: x8  x7  x6  x5  x4  x3  x2  x1
	 * byte 4: y8  y7  y6  y5  y4  y3  y2  y1
	 * byte 5: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
	 * byte 6: p8  p7  p6  p5  p4  p3  p2  p1
	 * byte 7: 0   0   0   0   0   0   0   0
	 * byte 8: 0   0   0   0   0   0   0   0
	 *
	 * f5-f1: finger touch bits
	 * L: clickpad button
	 * sy / sx: finger width / height expressed in traces, the total number
	 *          of traces can be queried by doing a HID_REQ_SET_REPORT
	 *          { 0x0d, 0x05, 0x03, 0x05, 0x01 } followed by a GET, in the
	 *          returned buf, buf[3]=no-x-traces, buf[4]=no-y-traces.
	 * p: pressure
	 */

	if (data[0] == ELAN_SINGLE_FINGER) {
		for (i = 0; i < ELAN_MAX_FINGERS; i++) {
			if (data[2] & BIT(i + 3))
				elan_report_mt_slot(drvdata, data + 3, i);
			else
				elan_report_mt_slot(drvdata, NULL, i);
		}
		input_report_key(input, BTN_LEFT, data[2] & 0x01);
	}
	/*
	 * When touched with two fingers Elan touchpad will emit two HID reports
	 * first is ELAN_MT_FIRST_FINGER and second is ELAN_MT_SECOND_FINGER
	 * we will save ELAN_MT_FIRST_FINGER report and wait for
	 * ELAN_MT_SECOND_FINGER to finish multitouch
	 */
	if (data[0] == ELAN_MT_FIRST_FINGER) {
		memcpy(drvdata->prev_report, data,
		       sizeof(drvdata->prev_report));
		return;
	}

	if (data[0] == ELAN_MT_SECOND_FINGER) {
		int first = 0;
		u8 *prev_report = drvdata->prev_report;

		if (prev_report[0] != ELAN_MT_FIRST_FINGER)
			return;

		for (i = 0; i < ELAN_MAX_FINGERS; i++) {
			if (prev_report[2] & BIT(i + 3)) {
				if (!first) {
					first = 1;
					elan_report_mt_slot(drvdata, prev_report + 3, i);
				} else {
					elan_report_mt_slot(drvdata, data + 1, i);
				}
			} else {
				elan_report_mt_slot(drvdata, NULL, i);
			}
		}
		input_report_key(input, BTN_LEFT, prev_report[2] & 0x01);
	}

	input_mt_sync_frame(input);
	input_sync(input);
}

static void elan_i2c_report_input(struct elan_drvdata *drvdata, u8 *data)
{
	struct input_dev *input = drvdata->input;
	u8 *finger_data;
	int i;

	/*
	 * Elan MT touchpads in i2c mode send finger data in the same format
	 * as in USB mode, but then with all fingers in a single packet.
	 *
	 * packet structure for ELAN_MT_I2C:
	 *
	 * byte     1: 1   0   0   1   1   1   0   1   // 0x5d
	 * byte     2: f5  f4  f3  f2  f1  0   0   L
	 * byte     3: x12 x11 x10 x9  0?  y11 y10 y9
	 * byte     4: x8  x7  x6  x5  x4  x3  x2  x1
	 * byte     5: y8  y7  y6  y5  y4  y3  y2  y1
	 * byte     6: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
	 * byte     7: p8  p7  p6  p5  p4  p3  p2  p1
	 * byte  8-12: Same as byte 3-7 for second finger down
	 * byte 13-17: Same as byte 3-7 for third finger down
	 * byte 18-22: Same as byte 3-7 for fourth finger down
	 * byte 23-27: Same as byte 3-7 for fifth finger down
	 */

	finger_data = data + 2;
	for (i = 0; i < ELAN_MAX_FINGERS; i++) {
		if (data[1] & BIT(i + 3)) {
			elan_report_mt_slot(drvdata, finger_data, i);
			finger_data += ELAN_FINGER_DATA_LEN;
		} else {
			elan_report_mt_slot(drvdata, NULL, i);
		}
	}

	input_report_key(input, BTN_LEFT, data[1] & 0x01);
	input_mt_sync_frame(input);
	input_sync(input);
}

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

	if (is_not_elan_touchpad(hdev))
		return 0;

	if (data[0] == ELAN_SINGLE_FINGER ||
	    data[0] == ELAN_MT_FIRST_FINGER ||
	    data[0] == ELAN_MT_SECOND_FINGER) {
		if (size == ELAN_INPUT_REPORT_SIZE) {
			elan_usb_report_input(drvdata, data);
			return 1;
		}
	}

	if (data[0] == ELAN_MT_I2C && size == ELAN_I2C_REPORT_SIZE) {
		elan_i2c_report_input(drvdata, data);
		return 1;
	}

	return 0;
}

static int elan_start_multitouch(struct hid_device *hdev)
{
	int ret;

	/*
	 * This byte sequence will enable multitouch mode and disable
	 * mouse emulation
	 */
	static const unsigned char buf[] = { 0x0D, 0x00, 0x03, 0x21, 0x00 };
	unsigned char *dmabuf = kmemdup(buf, sizeof(buf), GFP_KERNEL);

	if (!dmabuf)
		return -ENOMEM;

	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, "Failed to start multitouch: %d\n", ret);
		return ret;
	}

	return 0;
}

static enum led_brightness elan_mute_led_get_brigtness(struct led_classdev *led_cdev)
{
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hdev = to_hid_device(dev);
	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);

	return drvdata->mute_led_state;
}

static int elan_mute_led_set_brigtness(struct led_classdev *led_cdev,
				       enum led_brightness value)
{
	int ret;
	u8 led_state;
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hdev = to_hid_device(dev);
	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);

	unsigned char *dmabuf = kzalloc(ELAN_LED_REPORT_SIZE, GFP_KERNEL);

	if (!dmabuf)
		return -ENOMEM;

	led_state = !!value;

	dmabuf[0] = ELAN_MUTE_LED_REPORT;
	dmabuf[1] = 0x02;
	dmabuf[2] = led_state;

	ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, ELAN_LED_REPORT_SIZE,
				 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);

	kfree(dmabuf);

	if (ret != ELAN_LED_REPORT_SIZE) {
		hid_err(hdev, "Failed to set mute led brightness: %d\n", ret);
		return ret;
	}

	drvdata->mute_led_state = led_state;
	return 0;
}

static int elan_init_mute_led(struct hid_device *hdev)
{
	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	struct led_classdev *mute_led = &drvdata->mute_led;

	mute_led->name = "elan:red:mute";
	mute_led->brightness_get = elan_mute_led_get_brigtness;
	mute_led->brightness_set_blocking = elan_mute_led_set_brigtness;
	mute_led->max_brightness = LED_ON;
	mute_led->dev = &hdev->dev;

	return devm_led_classdev_register(&hdev->dev, mute_led);
}

static int elan_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
	int ret;
	struct elan_drvdata *drvdata;

	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);

	if (!drvdata)
		return -ENOMEM;

	hid_set_drvdata(hdev, drvdata);

	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "Hid Parse failed\n");
		return ret;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
	if (ret) {
		hid_err(hdev, "Hid hw start failed\n");
		return ret;
	}

	if (is_not_elan_touchpad(hdev))
		return 0;

	if (!drvdata->input) {
		hid_err(hdev, "Input device is not registered\n");
		ret = -ENAVAIL;
		goto err;
	}

	ret = elan_start_multitouch(hdev);
	if (ret)
		goto err;

	if (id->driver_data & ELAN_HAS_LED) {
		ret = elan_init_mute_led(hdev);
		if (ret)
			goto err;
	}

	return 0;
err:
	hid_hw_stop(hdev);
	return ret;
}

static void elan_remove(struct hid_device *hdev)
{
	hid_hw_stop(hdev);
}

static const struct hid_device_id elan_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2),
	  .driver_data = ELAN_HAS_LED },
	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2_10_COVER),
	  .driver_data = ELAN_HAS_LED },
	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_TOSHIBA_CLICK_L9W) },
	{ }
};
MODULE_DEVICE_TABLE(hid, elan_devices);

static struct hid_driver elan_driver = {
	.name = "elan",
	.id_table = elan_devices,
	.input_mapping = elan_input_mapping,
	.input_configured = elan_input_configured,
	.raw_event = elan_raw_event,
	.probe = elan_probe,
	.remove = elan_remove,
};

module_hid_driver(elan_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alexandrov Stanislav");
MODULE_DESCRIPTION("Driver for HID ELAN Touchpads");
Commit	Line	Data
9a6a4193 AS	1	/*
	2	* HID Driver for ELAN Touchpad
	3	*
	4	* Currently only supports touchpad found on HP Pavilion X2 10
	5	*
	6	* Copyright (c) 2016 Alexandrov Stanislav <neko@nya.ai>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the Free
	10	* Software Foundation; either version 2 of the License, or (at your option)
	11	* any later version.
	12	*/
	13
	14	#include <linux/hid.h>
	15	#include <linux/input/mt.h>
	16	#include <linux/leds.h>
	17	#include <linux/module.h>
	18	#include <linux/usb.h>
	19
	20	#include "hid-ids.h"
	21
e7ad3dc9	22	#define ELAN_MT_I2C 0x5d
9a6a4193 AS	23	#define ELAN_SINGLE_FINGER 0x81
	24	#define ELAN_MT_FIRST_FINGER 0x82
	25	#define ELAN_MT_SECOND_FINGER 0x83
	26	#define ELAN_INPUT_REPORT_SIZE 8
e7ad3dc9 HG	27	#define ELAN_I2C_REPORT_SIZE 32
e7ad3dc9 HG	28	#define ELAN_FINGER_DATA_LEN 5
314f04e8	29	#define ELAN_MAX_FINGERS 5
2f612de2	30	#define ELAN_MAX_PRESSURE 255
314f04e8	31	#define ELAN_TP_USB_INTF 1
9a6a4193	32
79d11f2a HG	33	#define ELAN_FEATURE_REPORT 0x0d
	34	#define ELAN_FEATURE_SIZE 5
	35	#define ELAN_PARAM_MAX_X 6
	36	#define ELAN_PARAM_MAX_Y 7
	37	#define ELAN_PARAM_RES 8
	38
9a6a4193 AS	39	#define ELAN_MUTE_LED_REPORT 0xBC
	40	#define ELAN_LED_REPORT_SIZE 8
	41
7ed3f281 HG	42	#define ELAN_HAS_LED BIT(0)
7ed3f281 HG	43
9a6a4193 AS	44	struct elan_drvdata {
	45	struct input_dev *input;
	46	u8 prev_report[ELAN_INPUT_REPORT_SIZE];
	47	struct led_classdev mute_led;
	48	u8 mute_led_state;
79d11f2a HG	49	u16 max_x;
79d11f2a HG	50	u16 max_y;
19588bee HG	51	u16 res_x;
19588bee HG	52	u16 res_y;
9a6a4193 AS	53	};
	54
	55	static int is_not_elan_touchpad(struct hid_device *hdev)
	56	{
e7ad3dc9 HG	57	if (hdev->bus == BUS_USB) {
e7ad3dc9 HG	58	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
9a6a4193	59
e7ad3dc9 HG	60	return (intf->altsetting->desc.bInterfaceNumber !=
	61	ELAN_TP_USB_INTF);
	62	}
	63
	64	return 0;
9a6a4193 AS	65	}
	66
	67	static int elan_input_mapping(struct hid_device hdev, struct hid_input hi,
	68	struct hid_field field, struct hid_usage usage,
	69	unsigned long *bit, int max)
	70	{
	71	if (is_not_elan_touchpad(hdev))
	72	return 0;
	73
	74	if (field->report->id == ELAN_SINGLE_FINGER \|\|
	75	field->report->id == ELAN_MT_FIRST_FINGER \|\|
e7ad3dc9 HG	76	field->report->id == ELAN_MT_SECOND_FINGER \|\|
e7ad3dc9 HG	77	field->report->id == ELAN_MT_I2C)
9a6a4193 AS	78	return -1;
	79
	80	return 0;
	81	}
	82
79d11f2a HG	83	static int elan_get_device_param(struct hid_device *hdev,
	84	unsigned char *dmabuf, unsigned char param)
	85	{
	86	int ret;
	87
	88	dmabuf[0] = ELAN_FEATURE_REPORT;
	89	dmabuf[1] = 0x05;
	90	dmabuf[2] = 0x03;
	91	dmabuf[3] = param;
	92	dmabuf[4] = 0x01;
	93
	94	ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,
	95	ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,
	96	HID_REQ_SET_REPORT);
	97	if (ret != ELAN_FEATURE_SIZE) {
	98	hid_err(hdev, "Set report error for parm %d: %d\n", param, ret);
	99	return ret;
	100	}
	101
	102	ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,
	103	ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,
	104	HID_REQ_GET_REPORT);
	105	if (ret != ELAN_FEATURE_SIZE) {
	106	hid_err(hdev, "Get report error for parm %d: %d\n", param, ret);
	107	return ret;
	108	}
	109
	110	return 0;
	111	}
	112
19588bee HG	113	static unsigned int elan_convert_res(char val)
	114	{
	115	/*
	116	* (value from firmware) * 10 + 790 = dpi
	117	* dpi * 10 / 254 = dots/mm
	118	*/
	119	return (val * 10 + 790) * 10 / 254;
	120	}
	121
79d11f2a HG	122	static int elan_get_device_params(struct hid_device *hdev)
	123	{
	124	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	125	unsigned char *dmabuf;
	126	int ret;
	127
	128	dmabuf = kmalloc(ELAN_FEATURE_SIZE, GFP_KERNEL);
	129	if (!dmabuf)
	130	return -ENOMEM;
	131
	132	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_X);
	133	if (ret)
	134	goto err;
	135
	136	drvdata->max_x = (dmabuf[4] << 8) \| dmabuf[3];
	137
	138	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_Y);
	139	if (ret)
	140	goto err;
	141
	142	drvdata->max_y = (dmabuf[4] << 8) \| dmabuf[3];
	143
19588bee HG	144	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_RES);
	145	if (ret)
	146	goto err;
	147
	148	drvdata->res_x = elan_convert_res(dmabuf[3]);
	149	drvdata->res_y = elan_convert_res(dmabuf[4]);
	150
79d11f2a HG	151	err:
	152	kfree(dmabuf);
	153	return ret;
	154	}
	155
9a6a4193 AS	156	static int elan_input_configured(struct hid_device hdev, struct hid_input hi)
	157	{
	158	int ret;
	159	struct input_dev *input;
	160	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	161
	162	if (is_not_elan_touchpad(hdev))
	163	return 0;
	164
79d11f2a HG	165	ret = elan_get_device_params(hdev);
	166	if (ret)
	167	return ret;
	168
9a6a4193 AS	169	input = devm_input_allocate_device(&hdev->dev);
	170	if (!input)
	171	return -ENOMEM;
	172
	173	input->name = "Elan Touchpad";
	174	input->phys = hdev->phys;
	175	input->uniq = hdev->uniq;
	176	input->id.bustype = hdev->bus;
	177	input->id.vendor = hdev->vendor;
	178	input->id.product = hdev->product;
	179	input->id.version = hdev->version;
	180	input->dev.parent = &hdev->dev;
	181
79d11f2a HG	182	input_set_abs_params(input, ABS_MT_POSITION_X, 0, drvdata->max_x,
	183	0, 0);
	184	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, drvdata->max_y,
	185	0, 0);
2f612de2 HG	186	input_set_abs_params(input, ABS_MT_PRESSURE, 0, ELAN_MAX_PRESSURE,
2f612de2 HG	187	0, 0);
9a6a4193 AS	188
	189	__set_bit(BTN_LEFT, input->keybit);
	190	__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
	191
314f04e8	192	ret = input_mt_init_slots(input, ELAN_MAX_FINGERS, INPUT_MT_POINTER);
9a6a4193 AS	193	if (ret) {
	194	hid_err(hdev, "Failed to init elan MT slots: %d\n", ret);
	195	return ret;
	196	}
	197
19588bee HG	198	input_abs_set_res(input, ABS_X, drvdata->res_x);
	199	input_abs_set_res(input, ABS_Y, drvdata->res_y);
	200
9a6a4193 AS	201	ret = input_register_device(input);
	202	if (ret) {
	203	hid_err(hdev, "Failed to register elan input device: %d\n",
	204	ret);
	205	input_free_device(input);
	206	return ret;
	207	}
	208
	209	drvdata->input = input;
	210
	211	return 0;
	212	}
	213
	214	static void elan_report_mt_slot(struct elan_drvdata drvdata, u8 data,
	215	unsigned int slot_num)
	216	{
	217	struct input_dev *input = drvdata->input;
2f612de2	218	int x, y, p;
9a6a4193 AS	219
	220	bool active = !!data;
	221
	222	input_mt_slot(input, slot_num);
	223	input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
	224	if (active) {
	225	x = ((data[0] & 0xF0) << 4) \| data[1];
79d11f2a	226	y = drvdata->max_y -
9a6a4193	227	(((data[0] & 0x07) << 8) \| data[2]);
2f612de2	228	p = data[4];
9a6a4193 AS	229
	230	input_report_abs(input, ABS_MT_POSITION_X, x);
	231	input_report_abs(input, ABS_MT_POSITION_Y, y);
2f612de2	232	input_report_abs(input, ABS_MT_PRESSURE, p);
9a6a4193 AS	233	}
	234	}
	235
e7ad3dc9	236	static void elan_usb_report_input(struct elan_drvdata drvdata, u8 data)
9a6a4193 AS	237	{
	238	int i;
	239	struct input_dev *input = drvdata->input;
	240
	241	/*
	242	* There is 3 types of reports: for single touch,
	243	* for multitouch - first finger and for multitouch - second finger
	244	*
	245	* packet structure for ELAN_SINGLE_FINGER and ELAN_MT_FIRST_FINGER:
	246	*
	247	* byte 1: 1 0 0 0 0 0 0 1 // 0x81 or 0x82
	248	* byte 2: 0 0 0 0 0 0 0 0 // looks like unused
	249	* byte 3: f5 f4 f3 f2 f1 0 0 L
	250	* byte 4: x12 x11 x10 x9 0? y11 y10 y9
	251	* byte 5: x8 x7 x6 x5 x4 x3 x2 x1
	252	* byte 6: y8 y7 y6 y5 y4 y3 y2 y1
	253	* byte 7: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
2f612de2	254	* byte 8: p8 p7 p6 p5 p4 p3 p2 p1
9a6a4193 AS	255	*
	256	* packet structure for ELAN_MT_SECOND_FINGER:
	257	*
	258	* byte 1: 1 0 0 0 0 0 1 1 // 0x83
	259	* byte 2: x12 x11 x10 x9 0 y11 y10 y9
	260	* byte 3: x8 x7 x6 x5 x4 x3 x2 x1
	261	* byte 4: y8 y7 y6 y5 y4 y3 y2 y1
	262	* byte 5: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
2f612de2	263	* byte 6: p8 p7 p6 p5 p4 p3 p2 p1
9a6a4193 AS	264	* byte 7: 0 0 0 0 0 0 0 0
	265	* byte 8: 0 0 0 0 0 0 0 0
	266	*
	267	* f5-f1: finger touch bits
	268	* L: clickpad button
2f612de2 HG	269	* sy / sx: finger width / height expressed in traces, the total number
	270	* of traces can be queried by doing a HID_REQ_SET_REPORT
	271	* { 0x0d, 0x05, 0x03, 0x05, 0x01 } followed by a GET, in the
	272	* returned buf, buf[3]=no-x-traces, buf[4]=no-y-traces.
	273	* p: pressure
9a6a4193 AS	274	*/
	275
	276	if (data[0] == ELAN_SINGLE_FINGER) {
314f04e8	277	for (i = 0; i < ELAN_MAX_FINGERS; i++) {
9a6a4193 AS	278	if (data[2] & BIT(i + 3))
	279	elan_report_mt_slot(drvdata, data + 3, i);
	280	else
	281	elan_report_mt_slot(drvdata, NULL, i);
	282	}
	283	input_report_key(input, BTN_LEFT, data[2] & 0x01);
	284	}
	285	/*
	286	* When touched with two fingers Elan touchpad will emit two HID reports
	287	* first is ELAN_MT_FIRST_FINGER and second is ELAN_MT_SECOND_FINGER
	288	* we will save ELAN_MT_FIRST_FINGER report and wait for
	289	* ELAN_MT_SECOND_FINGER to finish multitouch
	290	*/
	291	if (data[0] == ELAN_MT_FIRST_FINGER) {
	292	memcpy(drvdata->prev_report, data,
	293	sizeof(drvdata->prev_report));
	294	return;
	295	}
	296
	297	if (data[0] == ELAN_MT_SECOND_FINGER) {
	298	int first = 0;
	299	u8 *prev_report = drvdata->prev_report;
	300
	301	if (prev_report[0] != ELAN_MT_FIRST_FINGER)
	302	return;
	303
314f04e8	304	for (i = 0; i < ELAN_MAX_FINGERS; i++) {
9a6a4193 AS	305	if (prev_report[2] & BIT(i + 3)) {
	306	if (!first) {
	307	first = 1;
	308	elan_report_mt_slot(drvdata, prev_report + 3, i);
	309	} else {
	310	elan_report_mt_slot(drvdata, data + 1, i);
	311	}
	312	} else {
	313	elan_report_mt_slot(drvdata, NULL, i);
	314	}
	315	}
	316	input_report_key(input, BTN_LEFT, prev_report[2] & 0x01);
	317	}
	318
	319	input_mt_sync_frame(input);
	320	input_sync(input);
	321	}
	322
e7ad3dc9 HG	323	static void elan_i2c_report_input(struct elan_drvdata drvdata, u8 data)
	324	{
	325	struct input_dev *input = drvdata->input;
	326	u8 *finger_data;
	327	int i;
	328
	329	/*
	330	* Elan MT touchpads in i2c mode send finger data in the same format
	331	* as in USB mode, but then with all fingers in a single packet.
	332	*
	333	* packet structure for ELAN_MT_I2C:
	334	*
	335	* byte 1: 1 0 0 1 1 1 0 1 // 0x5d
	336	* byte 2: f5 f4 f3 f2 f1 0 0 L
	337	* byte 3: x12 x11 x10 x9 0? y11 y10 y9
	338	* byte 4: x8 x7 x6 x5 x4 x3 x2 x1
	339	* byte 5: y8 y7 y6 y5 y4 y3 y2 y1
	340	* byte 6: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
	341	* byte 7: p8 p7 p6 p5 p4 p3 p2 p1
	342	* byte 8-12: Same as byte 3-7 for second finger down
	343	* byte 13-17: Same as byte 3-7 for third finger down
	344	* byte 18-22: Same as byte 3-7 for fourth finger down
	345	* byte 23-27: Same as byte 3-7 for fifth finger down
	346	*/
	347
	348	finger_data = data + 2;
	349	for (i = 0; i < ELAN_MAX_FINGERS; i++) {
	350	if (data[1] & BIT(i + 3)) {
	351	elan_report_mt_slot(drvdata, finger_data, i);
	352	finger_data += ELAN_FINGER_DATA_LEN;
	353	} else {
	354	elan_report_mt_slot(drvdata, NULL, i);
	355	}
	356	}
	357
	358	input_report_key(input, BTN_LEFT, data[1] & 0x01);
	359	input_mt_sync_frame(input);
	360	input_sync(input);
	361	}
	362
9a6a4193 AS	363	static int elan_raw_event(struct hid_device *hdev,
	364	struct hid_report report, u8 data, int size)
	365	{
	366	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	367
	368	if (is_not_elan_touchpad(hdev))
	369	return 0;
	370
	371	if (data[0] == ELAN_SINGLE_FINGER \|\|
	372	data[0] == ELAN_MT_FIRST_FINGER \|\|
	373	data[0] == ELAN_MT_SECOND_FINGER) {
	374	if (size == ELAN_INPUT_REPORT_SIZE) {
e7ad3dc9	375	elan_usb_report_input(drvdata, data);
9a6a4193 AS	376	return 1;
	377	}
	378	}
	379
e7ad3dc9 HG	380	if (data[0] == ELAN_MT_I2C && size == ELAN_I2C_REPORT_SIZE) {
	381	elan_i2c_report_input(drvdata, data);
	382	return 1;
	383	}
	384
9a6a4193 AS	385	return 0;
	386	}
	387
	388	static int elan_start_multitouch(struct hid_device *hdev)
	389	{
	390	int ret;
	391
	392	/*
	393	* This byte sequence will enable multitouch mode and disable
	394	* mouse emulation
	395	*/
8471300f	396	static const unsigned char buf[] = { 0x0D, 0x00, 0x03, 0x21, 0x00 };
9a6a4193 AS	397	unsigned char *dmabuf = kmemdup(buf, sizeof(buf), GFP_KERNEL);
	398
	399	if (!dmabuf)
	400	return -ENOMEM;
	401
	402	ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, sizeof(buf),
	403	HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
	404
	405	kfree(dmabuf);
	406
	407	if (ret != sizeof(buf)) {
	408	hid_err(hdev, "Failed to start multitouch: %d\n", ret);
	409	return ret;
	410	}
	411
	412	return 0;
	413	}
	414
	415	static enum led_brightness elan_mute_led_get_brigtness(struct led_classdev *led_cdev)
	416	{
	417	struct device *dev = led_cdev->dev->parent;
	418	struct hid_device *hdev = to_hid_device(dev);
	419	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	420
	421	return drvdata->mute_led_state;
	422	}
	423
	424	static int elan_mute_led_set_brigtness(struct led_classdev *led_cdev,
	425	enum led_brightness value)
	426	{
	427	int ret;
	428	u8 led_state;
	429	struct device *dev = led_cdev->dev->parent;
	430	struct hid_device *hdev = to_hid_device(dev);
	431	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	432
	433	unsigned char *dmabuf = kzalloc(ELAN_LED_REPORT_SIZE, GFP_KERNEL);
	434
	435	if (!dmabuf)
	436	return -ENOMEM;
	437
	438	led_state = !!value;
	439
	440	dmabuf[0] = ELAN_MUTE_LED_REPORT;
	441	dmabuf[1] = 0x02;
	442	dmabuf[2] = led_state;
	443
	444	ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, ELAN_LED_REPORT_SIZE,
	445	HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
	446
	447	kfree(dmabuf);
	448
	449	if (ret != ELAN_LED_REPORT_SIZE) {
	450	hid_err(hdev, "Failed to set mute led brightness: %d\n", ret);
	451	return ret;
	452	}
	453
	454	drvdata->mute_led_state = led_state;
	455	return 0;
	456	}
	457
	458	static int elan_init_mute_led(struct hid_device *hdev)
	459	{
	460	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
461	struct led_classdev *mute_led = &drvdata->mute_led;
462
463	mute_led->name = "elan:red:mute";
464	mute_led->brightness_get = elan_mute_led_get_brigtness;
465	mute_led->brightness_set_blocking = elan_mute_led_set_brigtness;
466	mute_led->max_brightness = LED_ON;
467	mute_led->dev = &hdev->dev;
468
469	return devm_led_classdev_register(&hdev->dev, mute_led);
470	}
471
472	static int elan_probe(struct hid_device hdev, const struct hid_device_id id)
473	{
474	int ret;
475	struct elan_drvdata *drvdata;
476
477	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
478
479	if (!drvdata)
480	return -ENOMEM;
481
9a6a4193 AS	482	hid_set_drvdata(hdev, drvdata);
	483
	484	ret = hid_parse(hdev);
	485	if (ret) {
	486	hid_err(hdev, "Hid Parse failed\n");
	487	return ret;
	488	}
	489
	490	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
	491	if (ret) {
	492	hid_err(hdev, "Hid hw start failed\n");
	493	return ret;
	494	}
	495
	496	if (is_not_elan_touchpad(hdev))
	497	return 0;
	498
	499	if (!drvdata->input) {
14f39921	500	hid_err(hdev, "Input device is not registered\n");
9a6a4193 AS	501	ret = -ENAVAIL;
	502	goto err;
	503	}
	504
	505	ret = elan_start_multitouch(hdev);
	506	if (ret)
	507	goto err;
	508
7ed3f281 HG	509	if (id->driver_data & ELAN_HAS_LED) {
	510	ret = elan_init_mute_led(hdev);
	511	if (ret)
	512	goto err;
	513	}
9a6a4193 AS	514
	515	return 0;
	516	err:
	517	hid_hw_stop(hdev);
	518	return ret;
	519	}
	520
	521	static void elan_remove(struct hid_device *hdev)
	522	{
	523	hid_hw_stop(hdev);
	524	}
	525
9a6a4193	526	static const struct hid_device_id elan_devices[] = {
6e5dd632 HG	527	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2),
6e5dd632 HG	528	.driver_data = ELAN_HAS_LED },
7ed3f281 HG	529	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2_10_COVER),
7ed3f281 HG	530	.driver_data = ELAN_HAS_LED },
e7ad3dc9	531	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_TOSHIBA_CLICK_L9W) },
9a6a4193 AS	532	{ }
9a6a4193 AS	533	};
9a6a4193 AS	534	MODULE_DEVICE_TABLE(hid, elan_devices);
	535
	536	static struct hid_driver elan_driver = {
	537	.name = "elan",
	538	.id_table = elan_devices,
	539	.input_mapping = elan_input_mapping,
	540	.input_configured = elan_input_configured,
	541	.raw_event = elan_raw_event,
	542	.probe = elan_probe,
	543	.remove = elan_remove,
	544	};
	545
	546	module_hid_driver(elan_driver);
	547
	548	MODULE_LICENSE("GPL");
	549	MODULE_AUTHOR("Alexandrov Stanislav");
	550	MODULE_DESCRIPTION("Driver for HID ELAN Touchpads");