143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Helpers for ChromeOS HID Vivaldi keyboards
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*
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* Copyright (C) 2022 Google, Inc
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*/
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#include <linux/export.h>
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#include <linux/hid.h>
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#include <linux/input/vivaldi-fmap.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include "hid-vivaldi-common.h"
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#define MIN_FN_ROW_KEY 1
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#define MAX_FN_ROW_KEY VIVALDI_MAX_FUNCTION_ROW_KEYS
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#define HID_VD_FN_ROW_PHYSMAP 0x00000001
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#define HID_USAGE_FN_ROW_PHYSMAP (HID_UP_GOOGLEVENDOR | HID_VD_FN_ROW_PHYSMAP)
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/**
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* vivaldi_feature_mapping - Fill out vivaldi keymap data exposed via HID
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* @hdev: HID device to parse
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* @field: HID field to parse
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* @usage: HID usage to parse
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*
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* Note: this function assumes that driver data attached to @hdev contains an
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* instance of &struct vivaldi_data at the very beginning.
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*/
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void vivaldi_feature_mapping(struct hid_device *hdev,
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struct hid_field *field, struct hid_usage *usage)
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{
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struct vivaldi_data *data = hid_get_drvdata(hdev);
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struct hid_report *report = field->report;
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u8 *report_data, *buf;
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u32 report_len;
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unsigned int fn_key;
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int ret;
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if (field->logical != HID_USAGE_FN_ROW_PHYSMAP ||
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(usage->hid & HID_USAGE_PAGE) != HID_UP_ORDINAL)
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return;
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fn_key = usage->hid & HID_USAGE;
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if (fn_key < MIN_FN_ROW_KEY || fn_key > MAX_FN_ROW_KEY)
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return;
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if (fn_key > data->num_function_row_keys)
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data->num_function_row_keys = fn_key;
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report_data = buf = hid_alloc_report_buf(report, GFP_KERNEL);
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if (!report_data)
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return;
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report_len = hid_report_len(report);
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if (!report->id) {
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/*
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* hid_hw_raw_request() will stuff report ID (which will be 0)
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* into the first byte of the buffer even for unnumbered
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* reports, so we need to account for this to avoid getting
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* -EOVERFLOW in return.
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* Note that hid_alloc_report_buf() adds 7 bytes to the size
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* so we can safely say that we have space for an extra byte.
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*/
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report_len++;
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}
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ret = hid_hw_raw_request(hdev, report->id, report_data,
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report_len, HID_FEATURE_REPORT,
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HID_REQ_GET_REPORT);
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if (ret < 0) {
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dev_warn(&hdev->dev, "failed to fetch feature %d\n",
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field->report->id);
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goto out;
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}
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if (!report->id) {
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/*
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* Undo the damage from hid_hw_raw_request() for unnumbered
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* reports.
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*/
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report_data++;
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report_len--;
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}
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ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, report_data,
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report_len, 0);
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if (ret) {
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dev_warn(&hdev->dev, "failed to report feature %d\n",
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field->report->id);
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goto out;
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}
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data->function_row_physmap[fn_key - MIN_FN_ROW_KEY] =
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field->value[usage->usage_index];
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out:
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kfree(buf);
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}
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EXPORT_SYMBOL_GPL(vivaldi_feature_mapping);
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static ssize_t function_row_physmap_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct hid_device *hdev = to_hid_device(dev);
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struct vivaldi_data *data = hid_get_drvdata(hdev);
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return vivaldi_function_row_physmap_show(data, buf);
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}
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static DEVICE_ATTR_RO(function_row_physmap);
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static struct attribute *vivaldi_sysfs_attrs[] = {
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&dev_attr_function_row_physmap.attr,
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NULL
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};
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static umode_t vivaldi_is_visible(struct kobject *kobj, struct attribute *attr,
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int n)
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{
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struct hid_device *hdev = to_hid_device(kobj_to_dev(kobj));
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struct vivaldi_data *data = hid_get_drvdata(hdev);
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if (!data->num_function_row_keys)
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return 0;
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return attr->mode;
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}
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static const struct attribute_group vivaldi_attribute_group = {
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.attrs = vivaldi_sysfs_attrs,
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.is_visible = vivaldi_is_visible,
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};
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const struct attribute_group *vivaldi_attribute_groups[] = {
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&vivaldi_attribute_group,
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NULL,
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};
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EXPORT_SYMBOL_GPL(vivaldi_attribute_groups);
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MODULE_DESCRIPTION("Helpers for ChromeOS HID Vivaldi keyboards");
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MODULE_LICENSE("GPL");
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