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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * HID Driver for ELAN Touchpad
 *
 * Currently only supports touchpad found on HP Pavilion X2 10
 *
 * Copyright (c) 2016 Alexandrov Stanislav <neko@nya.ai>
 */

#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 (hid_is_usb(hdev)) {
		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_mt_destroy_slots(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 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) {
		if (ret != -ENODEV)
			hid_err(hdev, "Failed to set mute led brightness: %d\n", ret);
		return ret < 0 ? ret : -EIO;
	}

	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->default_trigger = "audio-mute";
	mute_led->brightness_set_blocking = elan_mute_led_set_brigtness;
	mute_led->max_brightness = LED_ON;
	mute_led->flags = LED_HW_PLUGGABLE;
	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 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,
};

module_hid_driver(elan_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alexandrov Stanislav");
MODULE_DESCRIPTION("Driver for HID ELAN Touchpads");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
9a6a4193 AS	2	/*
	3	* HID Driver for ELAN Touchpad
	4	*
	5	* Currently only supports touchpad found on HP Pavilion X2 10
	6	*
	7	* Copyright (c) 2016 Alexandrov Stanislav <neko@nya.ai>
9a6a4193 AS	8	*/
	9
	10	#include <linux/hid.h>
	11	#include <linux/input/mt.h>
	12	#include <linux/leds.h>
	13	#include <linux/module.h>
	14	#include <linux/usb.h>
	15
	16	#include "hid-ids.h"
	17
e7ad3dc9	18	#define ELAN_MT_I2C 0x5d
9a6a4193 AS	19	#define ELAN_SINGLE_FINGER 0x81
	20	#define ELAN_MT_FIRST_FINGER 0x82
	21	#define ELAN_MT_SECOND_FINGER 0x83
	22	#define ELAN_INPUT_REPORT_SIZE 8
e7ad3dc9 HG	23	#define ELAN_I2C_REPORT_SIZE 32
e7ad3dc9 HG	24	#define ELAN_FINGER_DATA_LEN 5
314f04e8	25	#define ELAN_MAX_FINGERS 5
2f612de2	26	#define ELAN_MAX_PRESSURE 255
314f04e8	27	#define ELAN_TP_USB_INTF 1
9a6a4193	28
79d11f2a HG	29	#define ELAN_FEATURE_REPORT 0x0d
	30	#define ELAN_FEATURE_SIZE 5
	31	#define ELAN_PARAM_MAX_X 6
	32	#define ELAN_PARAM_MAX_Y 7
	33	#define ELAN_PARAM_RES 8
	34
9a6a4193 AS	35	#define ELAN_MUTE_LED_REPORT 0xBC
	36	#define ELAN_LED_REPORT_SIZE 8
	37
7ed3f281 HG	38	#define ELAN_HAS_LED BIT(0)
7ed3f281 HG	39
9a6a4193 AS	40	struct elan_drvdata {
	41	struct input_dev *input;
	42	u8 prev_report[ELAN_INPUT_REPORT_SIZE];
	43	struct led_classdev mute_led;
	44	u8 mute_led_state;
79d11f2a HG	45	u16 max_x;
79d11f2a HG	46	u16 max_y;
19588bee HG	47	u16 res_x;
19588bee HG	48	u16 res_y;
9a6a4193 AS	49	};
	50
	51	static int is_not_elan_touchpad(struct hid_device *hdev)
	52	{
93020953	53	if (hid_is_usb(hdev)) {
e7ad3dc9	54	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
9a6a4193	55
e7ad3dc9 HG	56	return (intf->altsetting->desc.bInterfaceNumber !=
	57	ELAN_TP_USB_INTF);
	58	}
	59
	60	return 0;
9a6a4193 AS	61	}
	62
	63	static int elan_input_mapping(struct hid_device hdev, struct hid_input hi,
	64	struct hid_field field, struct hid_usage usage,
	65	unsigned long *bit, int max)
	66	{
	67	if (is_not_elan_touchpad(hdev))
	68	return 0;
	69
	70	if (field->report->id == ELAN_SINGLE_FINGER \|\|
	71	field->report->id == ELAN_MT_FIRST_FINGER \|\|
e7ad3dc9 HG	72	field->report->id == ELAN_MT_SECOND_FINGER \|\|
e7ad3dc9 HG	73	field->report->id == ELAN_MT_I2C)
9a6a4193 AS	74	return -1;
	75
	76	return 0;
	77	}
	78
79d11f2a HG	79	static int elan_get_device_param(struct hid_device *hdev,
	80	unsigned char *dmabuf, unsigned char param)
	81	{
	82	int ret;
	83
	84	dmabuf[0] = ELAN_FEATURE_REPORT;
	85	dmabuf[1] = 0x05;
	86	dmabuf[2] = 0x03;
	87	dmabuf[3] = param;
	88	dmabuf[4] = 0x01;
	89
	90	ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,
	91	ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,
	92	HID_REQ_SET_REPORT);
	93	if (ret != ELAN_FEATURE_SIZE) {
	94	hid_err(hdev, "Set report error for parm %d: %d\n", param, ret);
	95	return ret;
	96	}
	97
	98	ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,
	99	ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,
	100	HID_REQ_GET_REPORT);
	101	if (ret != ELAN_FEATURE_SIZE) {
	102	hid_err(hdev, "Get report error for parm %d: %d\n", param, ret);
	103	return ret;
	104	}
	105
	106	return 0;
	107	}
	108
19588bee HG	109	static unsigned int elan_convert_res(char val)
	110	{
	111	/*
	112	* (value from firmware) * 10 + 790 = dpi
	113	* dpi * 10 / 254 = dots/mm
	114	*/
	115	return (val * 10 + 790) * 10 / 254;
	116	}
	117
79d11f2a HG	118	static int elan_get_device_params(struct hid_device *hdev)
	119	{
	120	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	121	unsigned char *dmabuf;
	122	int ret;
	123
	124	dmabuf = kmalloc(ELAN_FEATURE_SIZE, GFP_KERNEL);
	125	if (!dmabuf)
	126	return -ENOMEM;
	127
	128	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_X);
	129	if (ret)
	130	goto err;
	131
	132	drvdata->max_x = (dmabuf[4] << 8) \| dmabuf[3];
	133
	134	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_Y);
	135	if (ret)
	136	goto err;
	137
	138	drvdata->max_y = (dmabuf[4] << 8) \| dmabuf[3];
	139
19588bee HG	140	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_RES);
	141	if (ret)
	142	goto err;
	143
	144	drvdata->res_x = elan_convert_res(dmabuf[3]);
	145	drvdata->res_y = elan_convert_res(dmabuf[4]);
	146
79d11f2a HG	147	err:
	148	kfree(dmabuf);
	149	return ret;
	150	}
	151
9a6a4193 AS	152	static int elan_input_configured(struct hid_device hdev, struct hid_input hi)
	153	{
	154	int ret;
	155	struct input_dev *input;
	156	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	157
	158	if (is_not_elan_touchpad(hdev))
	159	return 0;
	160
79d11f2a HG	161	ret = elan_get_device_params(hdev);
	162	if (ret)
	163	return ret;
	164
9a6a4193 AS	165	input = devm_input_allocate_device(&hdev->dev);
	166	if (!input)
	167	return -ENOMEM;
	168
	169	input->name = "Elan Touchpad";
	170	input->phys = hdev->phys;
	171	input->uniq = hdev->uniq;
	172	input->id.bustype = hdev->bus;
	173	input->id.vendor = hdev->vendor;
	174	input->id.product = hdev->product;
	175	input->id.version = hdev->version;
	176	input->dev.parent = &hdev->dev;
	177
79d11f2a HG	178	input_set_abs_params(input, ABS_MT_POSITION_X, 0, drvdata->max_x,
	179	0, 0);
	180	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, drvdata->max_y,
	181	0, 0);
2f612de2 HG	182	input_set_abs_params(input, ABS_MT_PRESSURE, 0, ELAN_MAX_PRESSURE,
2f612de2 HG	183	0, 0);
9a6a4193 AS	184
	185	__set_bit(BTN_LEFT, input->keybit);
	186	__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
	187
314f04e8	188	ret = input_mt_init_slots(input, ELAN_MAX_FINGERS, INPUT_MT_POINTER);
9a6a4193 AS	189	if (ret) {
	190	hid_err(hdev, "Failed to init elan MT slots: %d\n", ret);
	191	return ret;
	192	}
	193
19588bee HG	194	input_abs_set_res(input, ABS_X, drvdata->res_x);
	195	input_abs_set_res(input, ABS_Y, drvdata->res_y);
	196
9a6a4193 AS	197	ret = input_register_device(input);
	198	if (ret) {
	199	hid_err(hdev, "Failed to register elan input device: %d\n",
	200	ret);
b7429ea5	201	input_mt_destroy_slots(input);
9a6a4193 AS	202	return ret;
	203	}
	204
	205	drvdata->input = input;
	206
	207	return 0;
	208	}
	209
	210	static void elan_report_mt_slot(struct elan_drvdata drvdata, u8 data,
	211	unsigned int slot_num)
	212	{
	213	struct input_dev *input = drvdata->input;
2f612de2	214	int x, y, p;
9a6a4193 AS	215
	216	bool active = !!data;
	217
	218	input_mt_slot(input, slot_num);
	219	input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
	220	if (active) {
	221	x = ((data[0] & 0xF0) << 4) \| data[1];
79d11f2a	222	y = drvdata->max_y -
9a6a4193	223	(((data[0] & 0x07) << 8) \| data[2]);
2f612de2	224	p = data[4];
9a6a4193 AS	225
	226	input_report_abs(input, ABS_MT_POSITION_X, x);
	227	input_report_abs(input, ABS_MT_POSITION_Y, y);
2f612de2	228	input_report_abs(input, ABS_MT_PRESSURE, p);
9a6a4193 AS	229	}
	230	}
	231
e7ad3dc9	232	static void elan_usb_report_input(struct elan_drvdata drvdata, u8 data)
9a6a4193 AS	233	{
	234	int i;
	235	struct input_dev *input = drvdata->input;
	236
	237	/*
	238	* There is 3 types of reports: for single touch,
	239	* for multitouch - first finger and for multitouch - second finger
	240	*
	241	* packet structure for ELAN_SINGLE_FINGER and ELAN_MT_FIRST_FINGER:
	242	*
	243	* byte 1: 1 0 0 0 0 0 0 1 // 0x81 or 0x82
	244	* byte 2: 0 0 0 0 0 0 0 0 // looks like unused
	245	* byte 3: f5 f4 f3 f2 f1 0 0 L
	246	* byte 4: x12 x11 x10 x9 0? y11 y10 y9
	247	* byte 5: x8 x7 x6 x5 x4 x3 x2 x1
	248	* byte 6: y8 y7 y6 y5 y4 y3 y2 y1
	249	* byte 7: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
2f612de2	250	* byte 8: p8 p7 p6 p5 p4 p3 p2 p1
9a6a4193 AS	251	*
	252	* packet structure for ELAN_MT_SECOND_FINGER:
	253	*
	254	* byte 1: 1 0 0 0 0 0 1 1 // 0x83
	255	* byte 2: x12 x11 x10 x9 0 y11 y10 y9
	256	* byte 3: x8 x7 x6 x5 x4 x3 x2 x1
	257	* byte 4: y8 y7 y6 y5 y4 y3 y2 y1
	258	* byte 5: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
2f612de2	259	* byte 6: p8 p7 p6 p5 p4 p3 p2 p1
9a6a4193 AS	260	* byte 7: 0 0 0 0 0 0 0 0
	261	* byte 8: 0 0 0 0 0 0 0 0
	262	*
	263	* f5-f1: finger touch bits
	264	* L: clickpad button
2f612de2 HG	265	* sy / sx: finger width / height expressed in traces, the total number
	266	* of traces can be queried by doing a HID_REQ_SET_REPORT
	267	* { 0x0d, 0x05, 0x03, 0x05, 0x01 } followed by a GET, in the
	268	* returned buf, buf[3]=no-x-traces, buf[4]=no-y-traces.
	269	* p: pressure
9a6a4193 AS	270	*/
	271
	272	if (data[0] == ELAN_SINGLE_FINGER) {
314f04e8	273	for (i = 0; i < ELAN_MAX_FINGERS; i++) {
9a6a4193 AS	274	if (data[2] & BIT(i + 3))
	275	elan_report_mt_slot(drvdata, data + 3, i);
	276	else
	277	elan_report_mt_slot(drvdata, NULL, i);
	278	}
	279	input_report_key(input, BTN_LEFT, data[2] & 0x01);
	280	}
	281	/*
	282	* When touched with two fingers Elan touchpad will emit two HID reports
	283	* first is ELAN_MT_FIRST_FINGER and second is ELAN_MT_SECOND_FINGER
	284	* we will save ELAN_MT_FIRST_FINGER report and wait for
	285	* ELAN_MT_SECOND_FINGER to finish multitouch
	286	*/
	287	if (data[0] == ELAN_MT_FIRST_FINGER) {
	288	memcpy(drvdata->prev_report, data,
	289	sizeof(drvdata->prev_report));
	290	return;
	291	}
	292
	293	if (data[0] == ELAN_MT_SECOND_FINGER) {
	294	int first = 0;
	295	u8 *prev_report = drvdata->prev_report;
	296
	297	if (prev_report[0] != ELAN_MT_FIRST_FINGER)
	298	return;
	299
314f04e8	300	for (i = 0; i < ELAN_MAX_FINGERS; i++) {
9a6a4193 AS	301	if (prev_report[2] & BIT(i + 3)) {
	302	if (!first) {
	303	first = 1;
	304	elan_report_mt_slot(drvdata, prev_report + 3, i);
	305	} else {
	306	elan_report_mt_slot(drvdata, data + 1, i);
	307	}
	308	} else {
	309	elan_report_mt_slot(drvdata, NULL, i);
	310	}
	311	}
	312	input_report_key(input, BTN_LEFT, prev_report[2] & 0x01);
	313	}
	314
	315	input_mt_sync_frame(input);
	316	input_sync(input);
	317	}
	318
e7ad3dc9 HG	319	static void elan_i2c_report_input(struct elan_drvdata drvdata, u8 data)
	320	{
	321	struct input_dev *input = drvdata->input;
	322	u8 *finger_data;
	323	int i;
	324
	325	/*
	326	* Elan MT touchpads in i2c mode send finger data in the same format
	327	* as in USB mode, but then with all fingers in a single packet.
	328	*
	329	* packet structure for ELAN_MT_I2C:
	330	*
	331	* byte 1: 1 0 0 1 1 1 0 1 // 0x5d
	332	* byte 2: f5 f4 f3 f2 f1 0 0 L
	333	* byte 3: x12 x11 x10 x9 0? y11 y10 y9
	334	* byte 4: x8 x7 x6 x5 x4 x3 x2 x1
	335	* byte 5: y8 y7 y6 y5 y4 y3 y2 y1
	336	* byte 6: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
	337	* byte 7: p8 p7 p6 p5 p4 p3 p2 p1
	338	* byte 8-12: Same as byte 3-7 for second finger down
	339	* byte 13-17: Same as byte 3-7 for third finger down
	340	* byte 18-22: Same as byte 3-7 for fourth finger down
	341	* byte 23-27: Same as byte 3-7 for fifth finger down
	342	*/
	343
	344	finger_data = data + 2;
	345	for (i = 0; i < ELAN_MAX_FINGERS; i++) {
	346	if (data[1] & BIT(i + 3)) {
	347	elan_report_mt_slot(drvdata, finger_data, i);
	348	finger_data += ELAN_FINGER_DATA_LEN;
	349	} else {
	350	elan_report_mt_slot(drvdata, NULL, i);
	351	}
	352	}
	353
	354	input_report_key(input, BTN_LEFT, data[1] & 0x01);
	355	input_mt_sync_frame(input);
	356	input_sync(input);
	357	}
	358
9a6a4193 AS	359	static int elan_raw_event(struct hid_device *hdev,
	360	struct hid_report report, u8 data, int size)
	361	{
	362	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	363
	364	if (is_not_elan_touchpad(hdev))
	365	return 0;
	366
	367	if (data[0] == ELAN_SINGLE_FINGER \|\|
	368	data[0] == ELAN_MT_FIRST_FINGER \|\|
	369	data[0] == ELAN_MT_SECOND_FINGER) {
	370	if (size == ELAN_INPUT_REPORT_SIZE) {
e7ad3dc9	371	elan_usb_report_input(drvdata, data);
9a6a4193 AS	372	return 1;
	373	}
	374	}
	375
e7ad3dc9 HG	376	if (data[0] == ELAN_MT_I2C && size == ELAN_I2C_REPORT_SIZE) {
	377	elan_i2c_report_input(drvdata, data);
	378	return 1;
	379	}
	380
9a6a4193 AS	381	return 0;
	382	}
	383
	384	static int elan_start_multitouch(struct hid_device *hdev)
	385	{
	386	int ret;
	387
	388	/*
	389	* This byte sequence will enable multitouch mode and disable
	390	* mouse emulation
	391	*/
8471300f	392	static const unsigned char buf[] = { 0x0D, 0x00, 0x03, 0x21, 0x00 };
9a6a4193 AS	393	unsigned char *dmabuf = kmemdup(buf, sizeof(buf), GFP_KERNEL);
	394
	395	if (!dmabuf)
	396	return -ENOMEM;
	397
	398	ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, sizeof(buf),
	399	HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
	400
	401	kfree(dmabuf);
	402
	403	if (ret != sizeof(buf)) {
	404	hid_err(hdev, "Failed to start multitouch: %d\n", ret);
	405	return ret;
	406	}
	407
	408	return 0;
	409	}
	410
9a6a4193 AS	411	static int elan_mute_led_set_brigtness(struct led_classdev *led_cdev,
	412	enum led_brightness value)
	413	{
	414	int ret;
	415	u8 led_state;
	416	struct device *dev = led_cdev->dev->parent;
	417	struct hid_device *hdev = to_hid_device(dev);
	418	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	419
	420	unsigned char *dmabuf = kzalloc(ELAN_LED_REPORT_SIZE, GFP_KERNEL);
	421
	422	if (!dmabuf)
	423	return -ENOMEM;
	424
	425	led_state = !!value;
	426
	427	dmabuf[0] = ELAN_MUTE_LED_REPORT;
	428	dmabuf[1] = 0x02;
	429	dmabuf[2] = led_state;
	430
	431	ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, ELAN_LED_REPORT_SIZE,
	432	HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
	433
	434	kfree(dmabuf);
	435
	436	if (ret != ELAN_LED_REPORT_SIZE) {
efb618fb HG	437	if (ret != -ENODEV)
	438	hid_err(hdev, "Failed to set mute led brightness: %d\n", ret);
	439	return ret < 0 ? ret : -EIO;
9a6a4193 AS	440	}
	441
	442	drvdata->mute_led_state = led_state;
	443	return 0;
	444	}
	445
	446	static int elan_init_mute_led(struct hid_device *hdev)
	447	{
	448	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	449	struct led_classdev *mute_led = &drvdata->mute_led;
	450
	451	mute_led->name = "elan:red:mute";
2601371e	452	mute_led->default_trigger = "audio-mute";
9a6a4193 AS	453	mute_led->brightness_set_blocking = elan_mute_led_set_brigtness;
9a6a4193 AS	454	mute_led->max_brightness = LED_ON;
efb618fb	455	mute_led->flags = LED_HW_PLUGGABLE;
9a6a4193 AS	456	mute_led->dev = &hdev->dev;
	457
	458	return devm_led_classdev_register(&hdev->dev, mute_led);
	459	}
	460
	461	static int elan_probe(struct hid_device hdev, const struct hid_device_id id)
	462	{
	463	int ret;
	464	struct elan_drvdata *drvdata;
	465
	466	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
	467
	468	if (!drvdata)
	469	return -ENOMEM;
	470
9a6a4193 AS	471	hid_set_drvdata(hdev, drvdata);
	472
	473	ret = hid_parse(hdev);
	474	if (ret) {
	475	hid_err(hdev, "Hid Parse failed\n");
	476	return ret;
	477	}
	478
	479	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
	480	if (ret) {
	481	hid_err(hdev, "Hid hw start failed\n");
	482	return ret;
	483	}
	484
	485	if (is_not_elan_touchpad(hdev))
	486	return 0;
	487
	488	if (!drvdata->input) {
14f39921	489	hid_err(hdev, "Input device is not registered\n");
9a6a4193 AS	490	ret = -ENAVAIL;
	491	goto err;
	492	}
	493
	494	ret = elan_start_multitouch(hdev);
	495	if (ret)
	496	goto err;
	497
7ed3f281 HG	498	if (id->driver_data & ELAN_HAS_LED) {
	499	ret = elan_init_mute_led(hdev);
	500	if (ret)
	501	goto err;
	502	}
9a6a4193 AS	503
	504	return 0;
	505	err:
	506	hid_hw_stop(hdev);
	507	return ret;
	508	}
	509
9a6a4193	510	static const struct hid_device_id elan_devices[] = {
6e5dd632 HG	511	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2),
6e5dd632 HG	512	.driver_data = ELAN_HAS_LED },
7ed3f281 HG	513	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2_10_COVER),
7ed3f281 HG	514	.driver_data = ELAN_HAS_LED },
e7ad3dc9	515	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_TOSHIBA_CLICK_L9W) },
9a6a4193 AS	516	{ }
9a6a4193 AS	517	};
9a6a4193 AS	518	MODULE_DEVICE_TABLE(hid, elan_devices);
	519
	520	static struct hid_driver elan_driver = {
	521	.name = "elan",
	522	.id_table = elan_devices,
	523	.input_mapping = elan_input_mapping,
	524	.input_configured = elan_input_configured,
	525	.raw_event = elan_raw_event,
	526	.probe = elan_probe,
9a6a4193 AS	527	};
	528
	529	module_hid_driver(elan_driver);
	530
	531	MODULE_LICENSE("GPL");
	532	MODULE_AUTHOR("Alexandrov Stanislav");
	533	MODULE_DESCRIPTION("Driver for HID ELAN Touchpads");