mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Greg Kroah-Hartman](/assets/img/avatar_default.png)
There is no need for a driver to individually add/create device groups, the driver core will do it automatically for you. Convert the hid-vivaldi core driver to use the dev_groups pointer instead of manually calling the driver core to create the group and have it be cleaned up later on by the devm core. Cc: Jiri Kosina <jikos@kernel.org> Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com> Cc: linux-input@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Helpers for ChromeOS HID Vivaldi keyboards
|
|
*
|
|
* Copyright (C) 2022 Google, Inc
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/hid.h>
|
|
#include <linux/input/vivaldi-fmap.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
|
|
#include "hid-vivaldi-common.h"
|
|
|
|
#define MIN_FN_ROW_KEY 1
|
|
#define MAX_FN_ROW_KEY VIVALDI_MAX_FUNCTION_ROW_KEYS
|
|
#define HID_VD_FN_ROW_PHYSMAP 0x00000001
|
|
#define HID_USAGE_FN_ROW_PHYSMAP (HID_UP_GOOGLEVENDOR | HID_VD_FN_ROW_PHYSMAP)
|
|
|
|
/**
|
|
* vivaldi_feature_mapping - Fill out vivaldi keymap data exposed via HID
|
|
* @hdev: HID device to parse
|
|
* @field: HID field to parse
|
|
* @usage: HID usage to parse
|
|
*
|
|
* Note: this function assumes that driver data attached to @hdev contains an
|
|
* instance of &struct vivaldi_data at the very beginning.
|
|
*/
|
|
void vivaldi_feature_mapping(struct hid_device *hdev,
|
|
struct hid_field *field, struct hid_usage *usage)
|
|
{
|
|
struct vivaldi_data *data = hid_get_drvdata(hdev);
|
|
struct hid_report *report = field->report;
|
|
u8 *report_data, *buf;
|
|
u32 report_len;
|
|
unsigned int fn_key;
|
|
int ret;
|
|
|
|
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 > data->num_function_row_keys)
|
|
data->num_function_row_keys = 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;
|
|
}
|
|
|
|
data->function_row_physmap[fn_key - MIN_FN_ROW_KEY] =
|
|
field->value[usage->usage_index];
|
|
|
|
out:
|
|
kfree(buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vivaldi_feature_mapping);
|
|
|
|
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 *data = hid_get_drvdata(hdev);
|
|
|
|
return vivaldi_function_row_physmap_show(data, buf);
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(function_row_physmap);
|
|
static struct attribute *vivaldi_sysfs_attrs[] = {
|
|
&dev_attr_function_row_physmap.attr,
|
|
NULL
|
|
};
|
|
|
|
static umode_t vivaldi_is_visible(struct kobject *kobj, struct attribute *attr,
|
|
int n)
|
|
{
|
|
struct hid_device *hdev = to_hid_device(kobj_to_dev(kobj));
|
|
struct vivaldi_data *data = hid_get_drvdata(hdev);
|
|
|
|
if (!data->num_function_row_keys)
|
|
return 0;
|
|
return attr->mode;
|
|
}
|
|
|
|
static const struct attribute_group vivaldi_attribute_group = {
|
|
.attrs = vivaldi_sysfs_attrs,
|
|
.is_visible = vivaldi_is_visible,
|
|
};
|
|
|
|
const struct attribute_group *vivaldi_attribute_groups[] = {
|
|
&vivaldi_attribute_group,
|
|
NULL,
|
|
};
|
|
EXPORT_SYMBOL_GPL(vivaldi_attribute_groups);
|
|
|
|
MODULE_LICENSE("GPL");
|