[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_SINGLE_FINGER	0x81
#define ELAN_MT_FIRST_FINGER	0x82
#define ELAN_MT_SECOND_FINGER	0x83
#define ELAN_INPUT_REPORT_SIZE	8

#define ELAN_MUTE_LED_REPORT	0xBC
#define ELAN_LED_REPORT_SIZE	8

struct elan_touchpad_settings {
	u8 max_fingers;
	u16 max_x;
	u16 max_y;
	u8 max_area_x;
	u8 max_area_y;
	u8 max_w;
	int usb_bInterfaceNumber;
};

struct elan_drvdata {
	struct input_dev *input;
	u8 prev_report[ELAN_INPUT_REPORT_SIZE];
	struct led_classdev mute_led;
	u8 mute_led_state;
	struct elan_touchpad_settings *settings;
};

static int is_not_elan_touchpad(struct hid_device *hdev)
{
	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);

	return (intf->altsetting->desc.bInterfaceNumber != drvdata->settings->usb_bInterfaceNumber);
}

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)
		return -1;

	return 0;
}

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;

	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->settings->max_x, 0, 0);
	input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
			     drvdata->settings->max_y, 0, 0);
	input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
			     drvdata->settings->max_fingers, 0, 0);
	input_set_abs_params(input, ABS_TOOL_WIDTH, 0,
			     drvdata->settings->max_w, 0, 0);

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

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

	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, w;

	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->settings->max_y -
		    (((data[0] & 0x07) << 8) | data[2]);
		w = 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_TOOL_WIDTH, w);
	}
}

static void elan_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: w8  w7  w6  w5  w4  w3  w2  w1
	 *
	 * 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: w8  w7  w6  w5  w4  w3  w2  w1
	 * 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: not sure yet, but this looks like rectangular
	 * area for finger
	 * w: looks like finger width
	 */

	if (data[0] == ELAN_SINGLE_FINGER) {
		for (i = 0; i < drvdata->settings->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 < drvdata->settings->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 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_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
	 */
	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;

	drvdata->settings = (struct elan_touchpad_settings *)id->driver_data;
	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 registred\n");
		ret = -ENAVAIL;
		goto err;
	}

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

	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 elan_touchpad_settings hp_x2_10_touchpad_data = {
	.max_fingers = 5,
	.max_x = 2930,
	.max_y = 1250,
	.max_area_x = 15,
	.max_area_y = 15,
	.max_w = 255,
	.usb_bInterfaceNumber = 1,
};

static const struct hid_device_id elan_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2_10_COVER),
		(kernel_ulong_t)&hp_x2_10_touchpad_data},
	{ }
};

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
	22	#define ELAN_SINGLE_FINGER 0x81
	23	#define ELAN_MT_FIRST_FINGER 0x82
	24	#define ELAN_MT_SECOND_FINGER 0x83
	25	#define ELAN_INPUT_REPORT_SIZE 8
	26
	27	#define ELAN_MUTE_LED_REPORT 0xBC
	28	#define ELAN_LED_REPORT_SIZE 8
	29
	30	struct elan_touchpad_settings {
	31	u8 max_fingers;
	32	u16 max_x;
	33	u16 max_y;
	34	u8 max_area_x;
	35	u8 max_area_y;
	36	u8 max_w;
	37	int usb_bInterfaceNumber;
	38	};
	39
	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;
	45	struct elan_touchpad_settings *settings;
	46	};
	47
	48	static int is_not_elan_touchpad(struct hid_device *hdev)
	49	{
	50	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
	51	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
	52
	53	return (intf->altsetting->desc.bInterfaceNumber != drvdata->settings->usb_bInterfaceNumber);
	54	}
	55
	56	static int elan_input_mapping(struct hid_device hdev, struct hid_input hi,
	57	struct hid_field field, struct hid_usage usage,
	58	unsigned long *bit, int max)
	59	{
	60	if (is_not_elan_touchpad(hdev))
	61	return 0;
	62
	63	if (field->report->id == ELAN_SINGLE_FINGER \|\|
	64	field->report->id == ELAN_MT_FIRST_FINGER \|\|
65	field->report->id == ELAN_MT_SECOND_FINGER)
66	return -1;
67
68	return 0;
69	}
70
71	static int elan_input_configured(struct hid_device hdev, struct hid_input hi)
72	{
73	int ret;
74	struct input_dev *input;
75	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
76
77	if (is_not_elan_touchpad(hdev))
78	return 0;
79
80	input = devm_input_allocate_device(&hdev->dev);
81	if (!input)
82	return -ENOMEM;
83
84	input->name = "Elan Touchpad";
85	input->phys = hdev->phys;
86	input->uniq = hdev->uniq;
87	input->id.bustype = hdev->bus;
88	input->id.vendor = hdev->vendor;
89	input->id.product = hdev->product;
90	input->id.version = hdev->version;
91	input->dev.parent = &hdev->dev;
92
93	input_set_abs_params(input, ABS_MT_POSITION_X, 0,
94	drvdata->settings->max_x, 0, 0);
95	input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
96	drvdata->settings->max_y, 0, 0);
97	input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
98	drvdata->settings->max_fingers, 0, 0);
99	input_set_abs_params(input, ABS_TOOL_WIDTH, 0,
100	drvdata->settings->max_w, 0, 0);
101
102	__set_bit(BTN_LEFT, input->keybit);
103	__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
104
105	ret = input_mt_init_slots(input, drvdata->settings->max_fingers,
106	INPUT_MT_POINTER);
107	if (ret) {
108	hid_err(hdev, "Failed to init elan MT slots: %d\n", ret);
109	return ret;
110	}
111
112	ret = input_register_device(input);
113	if (ret) {
114	hid_err(hdev, "Failed to register elan input device: %d\n",
115	ret);
116	input_free_device(input);
117	return ret;
118	}
119
120	drvdata->input = input;
121
122	return 0;
123	}
124
125	static void elan_report_mt_slot(struct elan_drvdata drvdata, u8 data,
126	unsigned int slot_num)
127	{
128	struct input_dev *input = drvdata->input;
129	int x, y, w;
130
131	bool active = !!data;
132
133	input_mt_slot(input, slot_num);
134	input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
135	if (active) {
136	x = ((data[0] & 0xF0) << 4) \| data[1];
137	y = drvdata->settings->max_y -
138	(((data[0] & 0x07) << 8) \| data[2]);
139	w = data[4];
140
141	input_report_abs(input, ABS_MT_POSITION_X, x);
142	input_report_abs(input, ABS_MT_POSITION_Y, y);
143	input_report_abs(input, ABS_TOOL_WIDTH, w);
144	}
145	}
146
147	static void elan_report_input(struct elan_drvdata drvdata, u8 data)
148	{
149	int i;
150	struct input_dev *input = drvdata->input;
151
152	/*
153	* There is 3 types of reports: for single touch,
154	* for multitouch - first finger and for multitouch - second finger
155	*
156	* packet structure for ELAN_SINGLE_FINGER and ELAN_MT_FIRST_FINGER:
157	*
158	* byte 1: 1 0 0 0 0 0 0 1 // 0x81 or 0x82
159	* byte 2: 0 0 0 0 0 0 0 0 // looks like unused
160	* byte 3: f5 f4 f3 f2 f1 0 0 L
161	* byte 4: x12 x11 x10 x9 0? y11 y10 y9
162	* byte 5: x8 x7 x6 x5 x4 x3 x2 x1
163	* byte 6: y8 y7 y6 y5 y4 y3 y2 y1
164	* byte 7: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
165	* byte 8: w8 w7 w6 w5 w4 w3 w2 w1
166	*
167	* packet structure for ELAN_MT_SECOND_FINGER:
168	*
169	* byte 1: 1 0 0 0 0 0 1 1 // 0x83
170	* byte 2: x12 x11 x10 x9 0 y11 y10 y9
171	* byte 3: x8 x7 x6 x5 x4 x3 x2 x1
172	* byte 4: y8 y7 y6 y5 y4 y3 y2 y1
173	* byte 5: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
174	* byte 6: w8 w7 w6 w5 w4 w3 w2 w1
175	* byte 7: 0 0 0 0 0 0 0 0
176	* byte 8: 0 0 0 0 0 0 0 0
177	*
178	* f5-f1: finger touch bits
179	* L: clickpad button
180	* sy / sx: not sure yet, but this looks like rectangular
181	* area for finger
182	* w: looks like finger width
183	*/
184
185	if (data[0] == ELAN_SINGLE_FINGER) {
186	for (i = 0; i < drvdata->settings->max_fingers; i++) {
187	if (data[2] & BIT(i + 3))
188	elan_report_mt_slot(drvdata, data + 3, i);
189	else
190	elan_report_mt_slot(drvdata, NULL, i);
191	}
192	input_report_key(input, BTN_LEFT, data[2] & 0x01);
193	}
194	/*
195	* When touched with two fingers Elan touchpad will emit two HID reports
196	* first is ELAN_MT_FIRST_FINGER and second is ELAN_MT_SECOND_FINGER
197	* we will save ELAN_MT_FIRST_FINGER report and wait for
198	* ELAN_MT_SECOND_FINGER to finish multitouch
199	*/
200	if (data[0] == ELAN_MT_FIRST_FINGER) {
201	memcpy(drvdata->prev_report, data,
202	sizeof(drvdata->prev_report));
203	return;
204	}
205
206	if (data[0] == ELAN_MT_SECOND_FINGER) {
207	int first = 0;
208	u8 *prev_report = drvdata->prev_report;
209
210	if (prev_report[0] != ELAN_MT_FIRST_FINGER)
211	return;
212
213	for (i = 0; i < drvdata->settings->max_fingers; i++) {
214	if (prev_report[2] & BIT(i + 3)) {
215	if (!first) {
216	first = 1;
217	elan_report_mt_slot(drvdata, prev_report + 3, i);
218	} else {
219	elan_report_mt_slot(drvdata, data + 1, i);
220	}
221	} else {
222	elan_report_mt_slot(drvdata, NULL, i);
223	}
224	}
225	input_report_key(input, BTN_LEFT, prev_report[2] & 0x01);
226	}
227
228	input_mt_sync_frame(input);
229	input_sync(input);
230	}
231
232	static int elan_raw_event(struct hid_device *hdev,
233	struct hid_report report, u8 data, int size)
234	{
235	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
236
237	if (is_not_elan_touchpad(hdev))
238	return 0;
239
240	if (data[0] == ELAN_SINGLE_FINGER \|\|
241	data[0] == ELAN_MT_FIRST_FINGER \|\|
242	data[0] == ELAN_MT_SECOND_FINGER) {
243	if (size == ELAN_INPUT_REPORT_SIZE) {
244	elan_report_input(drvdata, data);
245	return 1;
246	}
247	}
248
249	return 0;
250	}
251
252	static int elan_start_multitouch(struct hid_device *hdev)
253	{
254	int ret;
255
256	/*
257	* This byte sequence will enable multitouch mode and disable
258	* mouse emulation
259	*/
260	const unsigned char buf[] = { 0x0D, 0x00, 0x03, 0x21, 0x00 };
261	unsigned char *dmabuf = kmemdup(buf, sizeof(buf), GFP_KERNEL);
262
263	if (!dmabuf)
264	return -ENOMEM;
265
266	ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, sizeof(buf),
267	HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
268
269	kfree(dmabuf);
270
271	if (ret != sizeof(buf)) {
272	hid_err(hdev, "Failed to start multitouch: %d\n", ret);
273	return ret;
274	}
275
276	return 0;
277	}
278
279	static enum led_brightness elan_mute_led_get_brigtness(struct led_classdev *led_cdev)
280	{
281	struct device *dev = led_cdev->dev->parent;
282	struct hid_device *hdev = to_hid_device(dev);
283	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
284
285	return drvdata->mute_led_state;
286	}
287
288	static int elan_mute_led_set_brigtness(struct led_classdev *led_cdev,
289	enum led_brightness value)
290	{
291	int ret;
292	u8 led_state;
293	struct device *dev = led_cdev->dev->parent;
294	struct hid_device *hdev = to_hid_device(dev);
295	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
296
297	unsigned char *dmabuf = kzalloc(ELAN_LED_REPORT_SIZE, GFP_KERNEL);
298
299	if (!dmabuf)
300	return -ENOMEM;
301
302	led_state = !!value;
303
304	dmabuf[0] = ELAN_MUTE_LED_REPORT;
305	dmabuf[1] = 0x02;
306	dmabuf[2] = led_state;
307
308	ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, ELAN_LED_REPORT_SIZE,
309	HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
310
311	kfree(dmabuf);
312
313	if (ret != ELAN_LED_REPORT_SIZE) {
314	hid_err(hdev, "Failed to set mute led brightness: %d\n", ret);
315	return ret;
316	}
317
318	drvdata->mute_led_state = led_state;
319	return 0;
320	}
321
322	static int elan_init_mute_led(struct hid_device *hdev)
323	{
324	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
325	struct led_classdev *mute_led = &drvdata->mute_led;
326
327	mute_led->name = "elan:red:mute";
328	mute_led->brightness_get = elan_mute_led_get_brigtness;
329	mute_led->brightness_set_blocking = elan_mute_led_set_brigtness;
330	mute_led->max_brightness = LED_ON;
331	mute_led->dev = &hdev->dev;
332
333	return devm_led_classdev_register(&hdev->dev, mute_led);
334	}
335
336	static int elan_probe(struct hid_device hdev, const struct hid_device_id id)
337	{
338	int ret;
339	struct elan_drvdata *drvdata;
340
341	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
342
343	if (!drvdata)
344	return -ENOMEM;
345
346	drvdata->settings = (struct elan_touchpad_settings *)id->driver_data;
347	hid_set_drvdata(hdev, drvdata);
348
349	ret = hid_parse(hdev);
350	if (ret) {
351	hid_err(hdev, "Hid Parse failed\n");
352	return ret;
353	}
354
355	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
356	if (ret) {
357	hid_err(hdev, "Hid hw start failed\n");
358	return ret;
359	}
360
361	if (is_not_elan_touchpad(hdev))
362	return 0;
363
364	if (!drvdata->input) {
365	hid_err(hdev, "Input device is not registred\n");
366	ret = -ENAVAIL;
367	goto err;
368	}
369
370	ret = elan_start_multitouch(hdev);
371	if (ret)
372	goto err;
373
374	ret = elan_init_mute_led(hdev);
375	if (ret)
376	goto err;
377
378	return 0;
379	err:
380	hid_hw_stop(hdev);
381	return ret;
382	}
383
384	static void elan_remove(struct hid_device *hdev)
385	{
386	hid_hw_stop(hdev);
387	}
388
389	static const struct elan_touchpad_settings hp_x2_10_touchpad_data = {
390	.max_fingers = 5,
391	.max_x = 2930,
392	.max_y = 1250,
393	.max_area_x = 15,
394	.max_area_y = 15,
395	.max_w = 255,
396	.usb_bInterfaceNumber = 1,
397	};
398
399	static const struct hid_device_id elan_devices[] = {
400	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2_10_COVER),
401	(kernel_ulong_t)&hp_x2_10_touchpad_data},
402	{ }
403	};
404
405	MODULE_DEVICE_TABLE(hid, elan_devices);
406
407	static struct hid_driver elan_driver = {
408	.name = "elan",
409	.id_table = elan_devices,
410	.input_mapping = elan_input_mapping,
411	.input_configured = elan_input_configured,
412	.raw_event = elan_raw_event,
413	.probe = elan_probe,
414	.remove = elan_remove,
415	};
416
417	module_hid_driver(elan_driver);
418
419	MODULE_LICENSE("GPL");
420	MODULE_AUTHOR("Alexandrov Stanislav");
421	MODULE_DESCRIPTION("Driver for HID ELAN Touchpads");