534 lines
13 KiB
C
534 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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_MT_I2C 0x5d
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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_I2C_REPORT_SIZE 32
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#define ELAN_FINGER_DATA_LEN 5
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#define ELAN_MAX_FINGERS 5
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#define ELAN_MAX_PRESSURE 255
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#define ELAN_TP_USB_INTF 1
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#define ELAN_FEATURE_REPORT 0x0d
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#define ELAN_FEATURE_SIZE 5
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#define ELAN_PARAM_MAX_X 6
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#define ELAN_PARAM_MAX_Y 7
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#define ELAN_PARAM_RES 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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#define ELAN_HAS_LED BIT(0)
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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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u16 max_x;
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u16 max_y;
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u16 res_x;
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u16 res_y;
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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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if (hid_is_usb(hdev)) {
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struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
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return (intf->altsetting->desc.bInterfaceNumber !=
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ELAN_TP_USB_INTF);
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}
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return 0;
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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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field->report->id == ELAN_MT_I2C)
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return -1;
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return 0;
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}
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static int elan_get_device_param(struct hid_device *hdev,
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unsigned char *dmabuf, unsigned char param)
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{
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int ret;
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dmabuf[0] = ELAN_FEATURE_REPORT;
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dmabuf[1] = 0x05;
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dmabuf[2] = 0x03;
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dmabuf[3] = param;
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dmabuf[4] = 0x01;
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ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,
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ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,
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HID_REQ_SET_REPORT);
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if (ret != ELAN_FEATURE_SIZE) {
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hid_err(hdev, "Set report error for parm %d: %d\n", param, ret);
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return ret;
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}
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ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,
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ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,
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HID_REQ_GET_REPORT);
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if (ret != ELAN_FEATURE_SIZE) {
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hid_err(hdev, "Get report error for parm %d: %d\n", param, 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 unsigned int elan_convert_res(char val)
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{
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/*
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* (value from firmware) * 10 + 790 = dpi
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* dpi * 10 / 254 = dots/mm
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*/
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return (val * 10 + 790) * 10 / 254;
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}
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static int elan_get_device_params(struct hid_device *hdev)
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{
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struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
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unsigned char *dmabuf;
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int ret;
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dmabuf = kmalloc(ELAN_FEATURE_SIZE, GFP_KERNEL);
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if (!dmabuf)
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return -ENOMEM;
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ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_X);
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if (ret)
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goto err;
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drvdata->max_x = (dmabuf[4] << 8) | dmabuf[3];
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ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_Y);
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if (ret)
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goto err;
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drvdata->max_y = (dmabuf[4] << 8) | dmabuf[3];
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ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_RES);
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if (ret)
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goto err;
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drvdata->res_x = elan_convert_res(dmabuf[3]);
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drvdata->res_y = elan_convert_res(dmabuf[4]);
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err:
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kfree(dmabuf);
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return ret;
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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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ret = elan_get_device_params(hdev);
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if (ret)
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return ret;
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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, drvdata->max_x,
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0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0, drvdata->max_y,
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0, 0);
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input_set_abs_params(input, ABS_MT_PRESSURE, 0, ELAN_MAX_PRESSURE,
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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, ELAN_MAX_FINGERS, 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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input_abs_set_res(input, ABS_X, drvdata->res_x);
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input_abs_set_res(input, ABS_Y, drvdata->res_y);
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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_mt_destroy_slots(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, p;
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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->max_y -
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(((data[0] & 0x07) << 8) | data[2]);
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p = 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_MT_PRESSURE, p);
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}
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}
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static void elan_usb_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: p8 p7 p6 p5 p4 p3 p2 p1
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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: p8 p7 p6 p5 p4 p3 p2 p1
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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: finger width / height expressed in traces, the total number
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* of traces can be queried by doing a HID_REQ_SET_REPORT
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* { 0x0d, 0x05, 0x03, 0x05, 0x01 } followed by a GET, in the
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* returned buf, buf[3]=no-x-traces, buf[4]=no-y-traces.
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* p: pressure
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*/
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if (data[0] == ELAN_SINGLE_FINGER) {
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for (i = 0; i < ELAN_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 < ELAN_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 void elan_i2c_report_input(struct elan_drvdata *drvdata, u8 *data)
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{
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struct input_dev *input = drvdata->input;
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u8 *finger_data;
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int i;
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/*
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* Elan MT touchpads in i2c mode send finger data in the same format
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* as in USB mode, but then with all fingers in a single packet.
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*
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* packet structure for ELAN_MT_I2C:
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*
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* byte 1: 1 0 0 1 1 1 0 1 // 0x5d
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* byte 2: f5 f4 f3 f2 f1 0 0 L
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* byte 3: x12 x11 x10 x9 0? y11 y10 y9
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* byte 4: x8 x7 x6 x5 x4 x3 x2 x1
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* byte 5: y8 y7 y6 y5 y4 y3 y2 y1
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* byte 6: sy4 sy3 sy2 sy1 sx4 sx3 sx2 sx1
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* byte 7: p8 p7 p6 p5 p4 p3 p2 p1
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* byte 8-12: Same as byte 3-7 for second finger down
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* byte 13-17: Same as byte 3-7 for third finger down
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* byte 18-22: Same as byte 3-7 for fourth finger down
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* byte 23-27: Same as byte 3-7 for fifth finger down
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*/
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finger_data = data + 2;
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for (i = 0; i < ELAN_MAX_FINGERS; i++) {
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if (data[1] & BIT(i + 3)) {
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elan_report_mt_slot(drvdata, finger_data, i);
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finger_data += ELAN_FINGER_DATA_LEN;
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} else {
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elan_report_mt_slot(drvdata, NULL, i);
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}
|
||
|
|
}
|
||
|
|
|
||
|
|
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");
|