mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Sean O'Brien](/assets/img/avatar_default.png)
Add vivaldi HID driver. This driver allows us to read and report the top row layout of keyboards which provide a vendor-defined (Google) HID usage. Signed-off-by: Sean O'Brien <seobrien@chromium.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
// 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);
|
|
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);
|
|
int fn_key;
|
|
int ret;
|
|
u32 report_len;
|
|
u8 *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;
|
|
|
|
buf = hid_alloc_report_buf(field->report, GFP_KERNEL);
|
|
if (!buf)
|
|
return;
|
|
|
|
report_len = hid_report_len(field->report);
|
|
ret = hid_hw_raw_request(hdev, field->report->id, buf,
|
|
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;
|
|
}
|
|
|
|
ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf,
|
|
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 sysfs_create_group(&hdev->dev.kobj, &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");
|