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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Stadia controller rumble support.
*
* Copyright 2023 Google LLC
*/
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/module.h>
#include "hid-ids.h"
#define STADIA_FF_REPORT_ID 5
struct stadiaff_device {
struct hid_device *hid;
struct hid_report *report;
spinlock_t lock;
bool removed;
uint16_t strong_magnitude;
uint16_t weak_magnitude;
struct work_struct work;
};
static void stadiaff_work(struct work_struct *work)
{
struct stadiaff_device *stadiaff =
container_of(work, struct stadiaff_device, work);
struct hid_field *rumble_field = stadiaff->report->field[0];
unsigned long flags;
spin_lock_irqsave(&stadiaff->lock, flags);
rumble_field->value[0] = stadiaff->strong_magnitude;
rumble_field->value[1] = stadiaff->weak_magnitude;
spin_unlock_irqrestore(&stadiaff->lock, flags);
hid_hw_request(stadiaff->hid, stadiaff->report, HID_REQ_SET_REPORT);
}
static int stadiaff_play(struct input_dev *dev, void *data,
struct ff_effect *effect)
{
struct hid_device *hid = input_get_drvdata(dev);
struct stadiaff_device *stadiaff = hid_get_drvdata(hid);
unsigned long flags;
spin_lock_irqsave(&stadiaff->lock, flags);
if (!stadiaff->removed) {
stadiaff->strong_magnitude = effect->u.rumble.strong_magnitude;
stadiaff->weak_magnitude = effect->u.rumble.weak_magnitude;
schedule_work(&stadiaff->work);
}
spin_unlock_irqrestore(&stadiaff->lock, flags);
return 0;
}
static int stadiaff_init(struct hid_device *hid)
{
struct stadiaff_device *stadiaff;
struct hid_report *report;
struct hid_input *hidinput;
struct input_dev *dev;
int error;
if (list_empty(&hid->inputs)) {
hid_err(hid, "no inputs found\n");
return -ENODEV;
}
hidinput = list_entry(hid->inputs.next, struct hid_input, list);
dev = hidinput->input;
report = hid_validate_values(hid, HID_OUTPUT_REPORT,
STADIA_FF_REPORT_ID, 0, 2);
if (!report)
return -ENODEV;
stadiaff = devm_kzalloc(&hid->dev, sizeof(struct stadiaff_device),
GFP_KERNEL);
if (!stadiaff)
return -ENOMEM;
hid_set_drvdata(hid, stadiaff);
input_set_capability(dev, EV_FF, FF_RUMBLE);
error = input_ff_create_memless(dev, NULL, stadiaff_play);
if (error)
return error;
stadiaff->removed = false;
stadiaff->hid = hid;
stadiaff->report = report;
INIT_WORK(&stadiaff->work, stadiaff_work);
spin_lock_init(&stadiaff->lock);
hid_info(hid, "Force Feedback for Google Stadia controller\n");
return 0;
}
static int stadia_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed\n");
return ret;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
if (ret) {
hid_err(hdev, "hw start failed\n");
return ret;
}
ret = stadiaff_init(hdev);
if (ret) {
hid_err(hdev, "force feedback init failed\n");
hid_hw_stop(hdev);
return ret;
}
return 0;
}
static void stadia_remove(struct hid_device *hid)
{
struct stadiaff_device *stadiaff = hid_get_drvdata(hid);
unsigned long flags;
spin_lock_irqsave(&stadiaff->lock, flags);
stadiaff->removed = true;
spin_unlock_irqrestore(&stadiaff->lock, flags);
cancel_work_sync(&stadiaff->work);
hid_hw_stop(hid);
}
static const struct hid_device_id stadia_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_STADIA) },
{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_STADIA) },
{ }
};
MODULE_DEVICE_TABLE(hid, stadia_devices);
static struct hid_driver stadia_driver = {
.name = "stadia",
.id_table = stadia_devices,
.probe = stadia_probe,
.remove = stadia_remove,
};
module_hid_driver(stadia_driver);
MODULE_DESCRIPTION("Google Stadia controller rumble support.");
MODULE_LICENSE("GPL");
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