Dynamically scan for correct feature report id

pull/16/head
Werner Sembach 2 years ago
parent 8f2ee508a5
commit 09cb3ba98e

@ -20,6 +20,8 @@
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <iomanip>
#include <cstring>
@ -92,6 +94,46 @@ static int get_touchpad_hidraw_devices(std::vector<std::string> *devnodes) {
return result;
}
static int get_hidraw_surface_button_switch_report_id(std::string devnode) {
int result = 0;
int hidraw = open(devnode.c_str(), O_WRONLY|O_NONBLOCK);
if (hidraw < 0) {
cerr << "get_hidraw_surface_button_switch_report_id(...): open(\"" << devnode << "\", O_WRONLY|O_NONBLOCK) failed." << endl;
return -EXIT_FAILURE;
}
else {
struct hidraw_report_descriptor report_descriptor;
result = ioctl(hidraw, HIDIOCGRDESCSIZE, &report_descriptor.size);
if (result < 0) {
cerr << "get_hidraw_surface_button_switch_report_id(...): ioctl(..., HIDIOCGRDESCSIZE, ...) on " << devnode << " failed." << endl;
close(hidraw);
return -EXIT_FAILURE;
}
result = ioctl(hidraw, HIDIOCGRDESC, &report_descriptor);
if (result < 0) {
cerr << "get_hidraw_surface_button_switch_report_id(...): ioctl(..., HIDIOCGRDESC, ...) on " << devnode << " failed." << endl;
close(hidraw);
return -EXIT_FAILURE;
}
close(hidraw);
__u8 surface_button_switch_collection_identifier[] = {0x05, 0x0d, 0x09, 0x22, 0xa1, 0x00, 0x09, 0x57, 0x09, 0x58};
auto it1 = std::search(std::begin(report_descriptor.value), std::end(report_descriptor.value), std::begin(surface_button_switch_collection_identifier), std::end(surface_button_switch_collection_identifier));
for (auto it2 = it1; it2 != std::end(report_descriptor.value); ++it2) {
cout << std::hex << std::setw(2) << std::setfill('0') << static_cast<int>(*it2) << std::dec << std::setw(0) << std::setfill(' ') << " ";
if (*it2 == 0x85 && std::next(it2) != std::end(report_descriptor.value)) {
return *(std::next(it2));
}
}
}
return -EXIT_FAILURE;
}
int set_touchpad_state(int enabled) {
std::vector<std::string> devnodes;
int touchpad_count = get_touchpad_hidraw_devices(&devnodes);
@ -107,38 +149,46 @@ int set_touchpad_state(int enabled) {
int result = EXIT_SUCCESS;
for (auto it = devnodes.begin(); it != devnodes.end(); ++it) {
int hidraw = open((*it).c_str(), O_WRONLY|O_NONBLOCK);
if (hidraw < 0) {
cerr << "send_events_handler(...): open(\"" << *it << "\", O_WRONLY|O_NONBLOCK) failed." << endl;
int feature_report_id = get_hidraw_surface_button_switch_report_id(*it);
if (feature_report_id < 0) {
cerr << "set_touchpad_state(...): get_hidraw_surface_button_switch_report_id(...) failed." << endl;
result = EXIT_FAILURE;
}
else {
// To enable touchpad send "0x03" as feature report nr.7 (0x07) to the touchpad hid device.
// To disable it send "0x00".
// Reference: https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/touchpad-configuration-collection#selective-reporting-feature-report
// Details:
// The two rightmost bits control the touchpad status
// In order, they are:
// 1. LED off + touchpad on/LED on + touchpad off
// 2. Clicks on/off
// So, the options are:
// 0x00 LED on, touchpad off, touchpad click off
// 0x01 LED on, touchpad off, touchpad click on
// 0x02 LED off, touchpad on, touchpad click off
// 0x03 LED off, touchpad on, touchpad click on
char buffer[2] = {0x07, 0x00};
if (enabled) {
buffer[1] = 0x03;
}
result = ioctl(hidraw, HIDIOCSFEATURE(sizeof(buffer)/sizeof(buffer[0])), buffer);
if (result < 0) {
cerr << "send_events_handler(...): ioctl(...) on " << *it << " failed." << endl;
int hidraw = open((*it).c_str(), O_WRONLY|O_NONBLOCK);
if (hidraw < 0) {
cerr << "set_touchpad_state(...): open(\"" << *it << "\", O_WRONLY|O_NONBLOCK) failed." << endl;
result = EXIT_FAILURE;
}
// else {}
close(hidraw);
else {
// To enable touchpad send "0x03" as feature report to the touchpad hid device. The feature report number can be gathered from the report descriptors.
// To disable it send "0x00".
// Reference: https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/touchpad-configuration-collection#selective-reporting-feature-report
// Details:
// The two rightmost bits control the touchpad status
// In order, they are:
// 1. LED off + touchpad on/LED on + touchpad off
// 2. Clicks on/off
// So, the options are:
// 0x00 LED on, touchpad off, touchpad click off
// 0x01 LED on, touchpad off, touchpad click on
// 0x02 LED off, touchpad on, touchpad click off
// 0x03 LED off, touchpad on, touchpad click on
char buffer[2] = {static_cast<char>(feature_report_id), 0x00};
if (enabled) {
buffer[1] = 0x03;
}
result = ioctl(hidraw, HIDIOCSFEATURE(sizeof(buffer)/sizeof(buffer[0])), buffer);
if (result < 0) {
cerr << "set_touchpad_state(...): ioctl(...) on " << *it << " failed." << endl;
result = EXIT_FAILURE;
}
close(hidraw);
result = EXIT_SUCCESS;
}
}
}

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