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// SPDX-License-Identifier: GPL-2.0
/*
* HID support for Vivaldi Keyboard
*
* Copyright 2020 Google LLC.
* Author: Sean O'Brien <seobrien@chromium.org>
*/
#include <linux/hid.h>
#include <linux/module.h>
#define MIN_FN_ROW_KEY 1
#define MAX_FN_ROW_KEY 24
#define HID_VD_FN_ROW_PHYSMAP 0x00000001
#define HID_USAGE_FN_ROW_PHYSMAP (HID_UP_GOOGLEVENDOR | HID_VD_FN_ROW_PHYSMAP)
static struct hid_driver hid_vivaldi;
struct vivaldi_data {
u32 function_row_physmap[MAX_FN_ROW_KEY - MIN_FN_ROW_KEY + 1];
int max_function_row_key;
};
static ssize_t function_row_physmap_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct vivaldi_data *drvdata = hid_get_drvdata(hdev);
ssize_t size = 0;
int i;
if (!drvdata->max_function_row_key)
return 0;
for (i = 0; i < drvdata->max_function_row_key; i++)
size += sprintf(buf + size, "%02X ",
drvdata->function_row_physmap[i]);
size += sprintf(buf + size, "\n");
return size;
}
DEVICE_ATTR_RO(function_row_physmap);
static struct attribute *sysfs_attrs[] = {
&dev_attr_function_row_physmap.attr,
NULL
};
static const struct attribute_group input_attribute_group = {
.attrs = sysfs_attrs
};
static int vivaldi_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
struct vivaldi_data *drvdata;
int ret;
drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
hid_set_drvdata(hdev, drvdata);
ret = hid_parse(hdev);
if (ret)
return ret;
return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
}
static void vivaldi_feature_mapping(struct hid_device *hdev,
struct hid_field *field,
struct hid_usage *usage)
{
struct vivaldi_data *drvdata = hid_get_drvdata(hdev);
struct hid_report *report = field->report;
int fn_key;
int ret;
u32 report_len;
u8 *report_data, *buf;
if (field->logical != HID_USAGE_FN_ROW_PHYSMAP ||
(usage->hid & HID_USAGE_PAGE) != HID_UP_ORDINAL)
return;
fn_key = (usage->hid & HID_USAGE);
if (fn_key < MIN_FN_ROW_KEY || fn_key > MAX_FN_ROW_KEY)
return;
if (fn_key > drvdata->max_function_row_key)
drvdata->max_function_row_key = fn_key;
report_data = buf = hid_alloc_report_buf(report, GFP_KERNEL);
if (!report_data)
return;
report_len = hid_report_len(report);
if (!report->id) {
/*
* hid_hw_raw_request() will stuff report ID (which will be 0)
* into the first byte of the buffer even for unnumbered
* reports, so we need to account for this to avoid getting
* -EOVERFLOW in return.
* Note that hid_alloc_report_buf() adds 7 bytes to the size
* so we can safely say that we have space for an extra byte.
*/
report_len++;
}
ret = hid_hw_raw_request(hdev, report->id, report_data,
report_len, HID_FEATURE_REPORT,
HID_REQ_GET_REPORT);
if (ret < 0) {
dev_warn(&hdev->dev, "failed to fetch feature %d\n",
field->report->id);
goto out;
}
if (!report->id) {
/*
* Undo the damage from hid_hw_raw_request() for unnumbered
* reports.
*/
report_data++;
report_len--;
}
ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, report_data,
report_len, 0);
if (ret) {
dev_warn(&hdev->dev, "failed to report feature %d\n",
field->report->id);
goto out;
}
drvdata->function_row_physmap[fn_key - MIN_FN_ROW_KEY] =
field->value[usage->usage_index];
out:
kfree(buf);
}
static int vivaldi_input_configured(struct hid_device *hdev,
struct hid_input *hidinput)
{
return devm_device_add_group(&hdev->dev, &input_attribute_group);
}
static const struct hid_device_id vivaldi_table[] = {
{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_VIVALDI, HID_ANY_ID,
HID_ANY_ID) },
{ }
};
MODULE_DEVICE_TABLE(hid, vivaldi_table);
static struct hid_driver hid_vivaldi = {
.name = "hid-vivaldi",
.id_table = vivaldi_table,
.probe = vivaldi_probe,
.feature_mapping = vivaldi_feature_mapping,
.input_configured = vivaldi_input_configured,
};
module_hid_driver(hid_vivaldi);
MODULE_AUTHOR("Sean O'Brien");
MODULE_DESCRIPTION("HID vivaldi driver");
MODULE_LICENSE("GPL");
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