422 lines
10 KiB
C
422 lines
10 KiB
C
/*
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* HID Driver for ELAN Touchpad
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*
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* Currently only supports touchpad found on HP Pavilion X2 10
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*
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* Copyright (c) 2016 Alexandrov Stanislav <neko@nya.ai>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/hid.h>
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#include <linux/input/mt.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include "hid-ids.h"
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#define ELAN_SINGLE_FINGER 0x81
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#define ELAN_MT_FIRST_FINGER 0x82
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#define ELAN_MT_SECOND_FINGER 0x83
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#define ELAN_INPUT_REPORT_SIZE 8
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#define ELAN_MUTE_LED_REPORT 0xBC
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#define ELAN_LED_REPORT_SIZE 8
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struct elan_touchpad_settings {
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u8 max_fingers;
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u16 max_x;
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u16 max_y;
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u8 max_area_x;
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u8 max_area_y;
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u8 max_w;
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int usb_bInterfaceNumber;
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};
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struct elan_drvdata {
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struct input_dev *input;
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u8 prev_report[ELAN_INPUT_REPORT_SIZE];
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struct led_classdev mute_led;
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u8 mute_led_state;
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struct elan_touchpad_settings *settings;
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};
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static int is_not_elan_touchpad(struct hid_device *hdev)
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{
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struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
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struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
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return (intf->altsetting->desc.bInterfaceNumber != drvdata->settings->usb_bInterfaceNumber);
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}
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static int elan_input_mapping(struct hid_device *hdev, struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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if (is_not_elan_touchpad(hdev))
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return 0;
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if (field->report->id == ELAN_SINGLE_FINGER ||
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field->report->id == ELAN_MT_FIRST_FINGER ||
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field->report->id == ELAN_MT_SECOND_FINGER)
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return -1;
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return 0;
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}
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static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi)
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{
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int ret;
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struct input_dev *input;
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struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
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if (is_not_elan_touchpad(hdev))
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return 0;
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input = devm_input_allocate_device(&hdev->dev);
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if (!input)
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return -ENOMEM;
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input->name = "Elan Touchpad";
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input->phys = hdev->phys;
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input->uniq = hdev->uniq;
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input->id.bustype = hdev->bus;
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input->id.vendor = hdev->vendor;
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input->id.product = hdev->product;
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input->id.version = hdev->version;
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input->dev.parent = &hdev->dev;
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input_set_abs_params(input, ABS_MT_POSITION_X, 0,
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drvdata->settings->max_x, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
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drvdata->settings->max_y, 0, 0);
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input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
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drvdata->settings->max_fingers, 0, 0);
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input_set_abs_params(input, ABS_TOOL_WIDTH, 0,
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drvdata->settings->max_w, 0, 0);
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__set_bit(BTN_LEFT, input->keybit);
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__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
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ret = input_mt_init_slots(input, drvdata->settings->max_fingers,
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INPUT_MT_POINTER);
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if (ret) {
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hid_err(hdev, "Failed to init elan MT slots: %d\n", ret);
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return ret;
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}
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ret = input_register_device(input);
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if (ret) {
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hid_err(hdev, "Failed to register elan input device: %d\n",
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ret);
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input_free_device(input);
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return ret;
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}
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drvdata->input = input;
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return 0;
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}
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static void elan_report_mt_slot(struct elan_drvdata *drvdata, u8 *data,
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unsigned int slot_num)
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{
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struct input_dev *input = drvdata->input;
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int x, y, w;
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bool active = !!data;
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input_mt_slot(input, slot_num);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
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if (active) {
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x = ((data[0] & 0xF0) << 4) | data[1];
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y = drvdata->settings->max_y -
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(((data[0] & 0x07) << 8) | data[2]);
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w = data[4];
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input_report_abs(input, ABS_MT_POSITION_X, x);
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input_report_abs(input, ABS_MT_POSITION_Y, y);
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input_report_abs(input, ABS_TOOL_WIDTH, w);
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}
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}
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static void elan_report_input(struct elan_drvdata *drvdata, u8 *data)
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{
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int i;
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struct input_dev *input = drvdata->input;
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/*
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* There is 3 types of reports: for single touch,
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* for multitouch - first finger and for multitouch - second finger
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*
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* packet structure for ELAN_SINGLE_FINGER and ELAN_MT_FIRST_FINGER:
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*
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* byte 1: 1 0 0 0 0 0 0 1 // 0x81 or 0x82
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* byte 2: 0 0 0 0 0 0 0 0 // looks like unused
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* byte 3: f5 f4 f3 f2 f1 0 0 L
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* byte 4: x12 x11 x10 x9 0? y11 y10 y9
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* byte 5: x8 x7 x6 x5 x4 x3 x2 x1
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* byte 6: y8 y7 y6 y5 y4 y3 y2 y1
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* byte 7: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
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* byte 8: w8 w7 w6 w5 w4 w3 w2 w1
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*
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* packet structure for ELAN_MT_SECOND_FINGER:
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*
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* byte 1: 1 0 0 0 0 0 1 1 // 0x83
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* byte 2: x12 x11 x10 x9 0 y11 y10 y9
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* byte 3: x8 x7 x6 x5 x4 x3 x2 x1
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* byte 4: y8 y7 y6 y5 y4 y3 y2 y1
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* byte 5: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
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* byte 6: w8 w7 w6 w5 w4 w3 w2 w1
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* byte 7: 0 0 0 0 0 0 0 0
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* byte 8: 0 0 0 0 0 0 0 0
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*
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* f5-f1: finger touch bits
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* L: clickpad button
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* sy / sx: not sure yet, but this looks like rectangular
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* area for finger
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* w: looks like finger width
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*/
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if (data[0] == ELAN_SINGLE_FINGER) {
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for (i = 0; i < drvdata->settings->max_fingers; i++) {
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if (data[2] & BIT(i + 3))
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elan_report_mt_slot(drvdata, data + 3, i);
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else
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elan_report_mt_slot(drvdata, NULL, i);
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}
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input_report_key(input, BTN_LEFT, data[2] & 0x01);
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}
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/*
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* When touched with two fingers Elan touchpad will emit two HID reports
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* first is ELAN_MT_FIRST_FINGER and second is ELAN_MT_SECOND_FINGER
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* we will save ELAN_MT_FIRST_FINGER report and wait for
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* ELAN_MT_SECOND_FINGER to finish multitouch
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*/
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if (data[0] == ELAN_MT_FIRST_FINGER) {
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memcpy(drvdata->prev_report, data,
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sizeof(drvdata->prev_report));
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return;
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}
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if (data[0] == ELAN_MT_SECOND_FINGER) {
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int first = 0;
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u8 *prev_report = drvdata->prev_report;
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if (prev_report[0] != ELAN_MT_FIRST_FINGER)
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return;
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for (i = 0; i < drvdata->settings->max_fingers; i++) {
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if (prev_report[2] & BIT(i + 3)) {
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if (!first) {
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first = 1;
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elan_report_mt_slot(drvdata, prev_report + 3, i);
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} else {
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elan_report_mt_slot(drvdata, data + 1, i);
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}
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} else {
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elan_report_mt_slot(drvdata, NULL, i);
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}
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}
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input_report_key(input, BTN_LEFT, prev_report[2] & 0x01);
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}
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input_mt_sync_frame(input);
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input_sync(input);
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}
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static int elan_raw_event(struct hid_device *hdev,
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struct hid_report *report, u8 *data, int size)
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{
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struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
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if (is_not_elan_touchpad(hdev))
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return 0;
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if (data[0] == ELAN_SINGLE_FINGER ||
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data[0] == ELAN_MT_FIRST_FINGER ||
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data[0] == ELAN_MT_SECOND_FINGER) {
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if (size == ELAN_INPUT_REPORT_SIZE) {
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elan_report_input(drvdata, data);
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return 1;
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}
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}
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return 0;
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}
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static int elan_start_multitouch(struct hid_device *hdev)
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{
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int ret;
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/*
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* This byte sequence will enable multitouch mode and disable
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* mouse emulation
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*/
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const unsigned char buf[] = { 0x0D, 0x00, 0x03, 0x21, 0x00 };
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unsigned char *dmabuf = kmemdup(buf, sizeof(buf), GFP_KERNEL);
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if (!dmabuf)
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return -ENOMEM;
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ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, sizeof(buf),
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HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
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kfree(dmabuf);
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if (ret != sizeof(buf)) {
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hid_err(hdev, "Failed to start multitouch: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static enum led_brightness elan_mute_led_get_brigtness(struct led_classdev *led_cdev)
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{
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struct device *dev = led_cdev->dev->parent;
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struct hid_device *hdev = to_hid_device(dev);
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struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
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return drvdata->mute_led_state;
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}
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static int elan_mute_led_set_brigtness(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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int ret;
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u8 led_state;
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struct device *dev = led_cdev->dev->parent;
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struct hid_device *hdev = to_hid_device(dev);
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struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
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unsigned char *dmabuf = kzalloc(ELAN_LED_REPORT_SIZE, GFP_KERNEL);
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if (!dmabuf)
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return -ENOMEM;
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led_state = !!value;
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dmabuf[0] = ELAN_MUTE_LED_REPORT;
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dmabuf[1] = 0x02;
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dmabuf[2] = led_state;
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ret = hid_hw_raw_request(hdev, dmabuf[0], dmabuf, ELAN_LED_REPORT_SIZE,
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HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
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kfree(dmabuf);
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if (ret != ELAN_LED_REPORT_SIZE) {
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hid_err(hdev, "Failed to set mute led brightness: %d\n", ret);
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return ret;
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}
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drvdata->mute_led_state = led_state;
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return 0;
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}
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static int elan_init_mute_led(struct hid_device *hdev)
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{
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struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
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struct led_classdev *mute_led = &drvdata->mute_led;
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mute_led->name = "elan:red:mute";
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mute_led->brightness_get = elan_mute_led_get_brigtness;
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mute_led->brightness_set_blocking = elan_mute_led_set_brigtness;
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mute_led->max_brightness = LED_ON;
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mute_led->dev = &hdev->dev;
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return devm_led_classdev_register(&hdev->dev, mute_led);
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}
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static int elan_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int ret;
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struct elan_drvdata *drvdata;
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drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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drvdata->settings = (struct elan_touchpad_settings *)id->driver_data;
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hid_set_drvdata(hdev, drvdata);
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ret = hid_parse(hdev);
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if (ret) {
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hid_err(hdev, "Hid Parse failed\n");
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return ret;
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}
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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if (ret) {
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hid_err(hdev, "Hid hw start failed\n");
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return ret;
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}
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if (is_not_elan_touchpad(hdev))
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return 0;
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if (!drvdata->input) {
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hid_err(hdev, "Input device is not registred\n");
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ret = -ENAVAIL;
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goto err;
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}
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ret = elan_start_multitouch(hdev);
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if (ret)
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goto err;
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ret = elan_init_mute_led(hdev);
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if (ret)
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goto err;
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return 0;
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err:
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hid_hw_stop(hdev);
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return ret;
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}
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static void elan_remove(struct hid_device *hdev)
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{
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hid_hw_stop(hdev);
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}
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static const struct elan_touchpad_settings hp_x2_10_touchpad_data = {
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.max_fingers = 5,
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.max_x = 2930,
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.max_y = 1250,
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.max_area_x = 15,
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.max_area_y = 15,
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.max_w = 255,
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.usb_bInterfaceNumber = 1,
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};
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static const struct hid_device_id elan_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2_10_COVER),
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(kernel_ulong_t)&hp_x2_10_touchpad_data},
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{ }
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};
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MODULE_DEVICE_TABLE(hid, elan_devices);
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static struct hid_driver elan_driver = {
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.name = "elan",
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.id_table = elan_devices,
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.input_mapping = elan_input_mapping,
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.input_configured = elan_input_configured,
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.raw_event = elan_raw_event,
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.probe = elan_probe,
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.remove = elan_remove,
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};
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module_hid_driver(elan_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Alexandrov Stanislav");
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MODULE_DESCRIPTION("Driver for HID ELAN Touchpads");
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