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linux/drivers/hid/hid-kysona.c
Lode Willems 113521a4d2 HID: Kysona: Add periodic online check 
This patch adds a periodic online check at the same interval the battery
status gets requested.
With this change the driver can detect when the mouse is turned off while
the dongle is still plugged in.

Tested with a Kysona M600 V-HUB Special Edition.

Signed-off-by: Lode Willems <me@lodewillems.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
2025-04-24 11:23:08 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* USB HID driver for Kysona
* Kysona M600 mice.
*
* Copyright (c) 2024 Lode Willems <me@lodewillems.com>
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/usb.h>
#include "hid-ids.h"
#define BATTERY_TIMEOUT_MS 5000
#define ONLINE_REPORT_ID 3
#define BATTERY_REPORT_ID 4
struct kysona_drvdata {
struct hid_device *hdev;
bool online;
struct power_supply_desc battery_desc;
struct power_supply *battery;
u8 battery_capacity;
bool battery_charging;
u16 battery_voltage;
struct delayed_work battery_work;
};
static enum power_supply_property kysona_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_SCOPE,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_ONLINE
};
static int kysona_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct kysona_drvdata *drv_data = power_supply_get_drvdata(psy);
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
val->intval = 1;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = drv_data->online;
break;
case POWER_SUPPLY_PROP_STATUS:
if (drv_data->online)
val->intval = drv_data->battery_charging ?
POWER_SUPPLY_STATUS_CHARGING :
POWER_SUPPLY_STATUS_DISCHARGING;
else
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
break;
case POWER_SUPPLY_PROP_SCOPE:
val->intval = POWER_SUPPLY_SCOPE_DEVICE;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = drv_data->battery_capacity;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
/* hardware reports voltage in mV. sysfs expects uV */
val->intval = drv_data->battery_voltage * 1000;
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = drv_data->hdev->name;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static const char kysona_online_request[] = {
0x08, ONLINE_REPORT_ID, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4a
};
static const char kysona_battery_request[] = {
0x08, BATTERY_REPORT_ID, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x49
};
static int kysona_m600_fetch_online(struct hid_device *hdev)
{
u8 *write_buf;
int ret;
/* Request online information */
write_buf = kmemdup(kysona_online_request, sizeof(kysona_online_request), GFP_KERNEL);
if (!write_buf)
return -ENOMEM;
ret = hid_hw_raw_request(hdev, kysona_online_request[0],
write_buf, sizeof(kysona_online_request),
HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
if (ret < (int)sizeof(kysona_online_request)) {
hid_err(hdev, "hid_hw_raw_request() failed with %d\n", ret);
ret = -ENODATA;
}
kfree(write_buf);
return ret;
}
static void kysona_fetch_online(struct hid_device *hdev)
{
int ret = kysona_m600_fetch_online(hdev);
if (ret < 0)
hid_dbg(hdev,
"Online query failed (err: %d)\n", ret);
}
static int kysona_m600_fetch_battery(struct hid_device *hdev)
{
u8 *write_buf;
int ret;
/* Request battery information */
write_buf = kmemdup(kysona_battery_request, sizeof(kysona_battery_request), GFP_KERNEL);
if (!write_buf)
return -ENOMEM;
ret = hid_hw_raw_request(hdev, kysona_battery_request[0],
write_buf, sizeof(kysona_battery_request),
HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
if (ret < (int)sizeof(kysona_battery_request)) {
hid_err(hdev, "hid_hw_raw_request() failed with %d\n", ret);
ret = -ENODATA;
}
kfree(write_buf);
return ret;
}
static void kysona_fetch_battery(struct hid_device *hdev)
{
int ret = kysona_m600_fetch_battery(hdev);
if (ret < 0)
hid_dbg(hdev,
"Battery query failed (err: %d)\n", ret);
}
static void kysona_battery_timer_tick(struct work_struct *work)
{
struct kysona_drvdata *drv_data = container_of(work,
struct kysona_drvdata, battery_work.work);
struct hid_device *hdev = drv_data->hdev;
kysona_fetch_online(hdev);
kysona_fetch_battery(hdev);
schedule_delayed_work(&drv_data->battery_work,
msecs_to_jiffies(BATTERY_TIMEOUT_MS));
}
static int kysona_battery_probe(struct hid_device *hdev)
{
struct kysona_drvdata *drv_data = hid_get_drvdata(hdev);
struct power_supply_config pscfg = { .drv_data = drv_data };
int ret = 0;
drv_data->online = false;
drv_data->battery_capacity = 100;
drv_data->battery_voltage = 4200;
drv_data->battery_desc.properties = kysona_battery_props;
drv_data->battery_desc.num_properties = ARRAY_SIZE(kysona_battery_props);
drv_data->battery_desc.get_property = kysona_battery_get_property;
drv_data->battery_desc.type = POWER_SUPPLY_TYPE_BATTERY;
drv_data->battery_desc.use_for_apm = 0;
drv_data->battery_desc.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
"kysona-%s-battery",
strlen(hdev->uniq) ?
hdev->uniq : dev_name(&hdev->dev));
if (!drv_data->battery_desc.name)
return -ENOMEM;
drv_data->battery = devm_power_supply_register(&hdev->dev,
&drv_data->battery_desc, &pscfg);
if (IS_ERR(drv_data->battery)) {
ret = PTR_ERR(drv_data->battery);
drv_data->battery = NULL;
hid_err(hdev, "Unable to register battery device\n");
return ret;
}
power_supply_powers(drv_data->battery, &hdev->dev);
INIT_DELAYED_WORK(&drv_data->battery_work, kysona_battery_timer_tick);
kysona_fetch_online(hdev);
kysona_fetch_battery(hdev);
schedule_delayed_work(&drv_data->battery_work,
msecs_to_jiffies(BATTERY_TIMEOUT_MS));
return ret;
}
static int kysona_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
struct kysona_drvdata *drv_data;
struct usb_interface *usbif;
if (!hid_is_usb(hdev))
return -EINVAL;
usbif = to_usb_interface(hdev->dev.parent);
drv_data = devm_kzalloc(&hdev->dev, sizeof(*drv_data), GFP_KERNEL);
if (!drv_data)
return -ENOMEM;
hid_set_drvdata(hdev, drv_data);
drv_data->hdev = hdev;
ret = hid_parse(hdev);
if (ret)
return ret;
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret)
return ret;
if (usbif->cur_altsetting->desc.bInterfaceNumber == 1) {
if (kysona_battery_probe(hdev) < 0)
hid_err(hdev, "Kysona hid battery_probe failed: %d\n", ret);
}
return 0;
}
static int kysona_raw_event(struct hid_device *hdev,
struct hid_report *report, u8 *data, int size)
{
struct kysona_drvdata *drv_data = hid_get_drvdata(hdev);
if (size == sizeof(kysona_online_request) &&
data[0] == 8 && data[1] == ONLINE_REPORT_ID) {
drv_data->online = data[6];
}
if (size == sizeof(kysona_battery_request) &&
data[0] == 8 && data[1] == BATTERY_REPORT_ID) {
drv_data->battery_capacity = data[6];
drv_data->battery_charging = data[7];
drv_data->battery_voltage = (data[8] << 8) | data[9];
}
return 0;
}
static void kysona_remove(struct hid_device *hdev)
{
struct kysona_drvdata *drv_data = hid_get_drvdata(hdev);
if (drv_data->battery)
cancel_delayed_work_sync(&drv_data->battery_work);
hid_hw_stop(hdev);
}
static const struct hid_device_id kysona_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_KYSONA, USB_DEVICE_ID_KYSONA_M600_DONGLE) },
{ HID_USB_DEVICE(USB_VENDOR_ID_KYSONA, USB_DEVICE_ID_KYSONA_M600_WIRED) },
{ }
};
MODULE_DEVICE_TABLE(hid, kysona_devices);
static struct hid_driver kysona_driver = {
.name = "kysona",
.id_table = kysona_devices,
.probe = kysona_probe,
.raw_event = kysona_raw_event,
.remove = kysona_remove
};
module_hid_driver(kysona_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("HID driver for Kysona devices");
MODULE_AUTHOR("Lode Willems <me@lodewillems.com>");
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