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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Stadia controller rumble support.4 *5 * Copyright 2023 Google LLC6 */7 8#include <linux/hid.h>9#include <linux/input.h>10#include <linux/slab.h>11#include <linux/module.h>12 13#include "hid-ids.h"14 15#define STADIA_FF_REPORT_ID 516 17struct stadiaff_device {18 struct hid_device *hid;19 struct hid_report *report;20 spinlock_t lock;21 bool removed;22 uint16_t strong_magnitude;23 uint16_t weak_magnitude;24 struct work_struct work;25};26 27static void stadiaff_work(struct work_struct *work)28{29 struct stadiaff_device *stadiaff =30 container_of(work, struct stadiaff_device, work);31 struct hid_field *rumble_field = stadiaff->report->field[0];32 unsigned long flags;33 34 spin_lock_irqsave(&stadiaff->lock, flags);35 rumble_field->value[0] = stadiaff->strong_magnitude;36 rumble_field->value[1] = stadiaff->weak_magnitude;37 spin_unlock_irqrestore(&stadiaff->lock, flags);38 39 hid_hw_request(stadiaff->hid, stadiaff->report, HID_REQ_SET_REPORT);40}41 42static int stadiaff_play(struct input_dev *dev, void *data,43 struct ff_effect *effect)44{45 struct hid_device *hid = input_get_drvdata(dev);46 struct stadiaff_device *stadiaff = hid_get_drvdata(hid);47 unsigned long flags;48 49 spin_lock_irqsave(&stadiaff->lock, flags);50 if (!stadiaff->removed) {51 stadiaff->strong_magnitude = effect->u.rumble.strong_magnitude;52 stadiaff->weak_magnitude = effect->u.rumble.weak_magnitude;53 schedule_work(&stadiaff->work);54 }55 spin_unlock_irqrestore(&stadiaff->lock, flags);56 57 return 0;58}59 60static int stadiaff_init(struct hid_device *hid)61{62 struct stadiaff_device *stadiaff;63 struct hid_report *report;64 struct hid_input *hidinput;65 struct input_dev *dev;66 int error;67 68 if (list_empty(&hid->inputs)) {69 hid_err(hid, "no inputs found\n");70 return -ENODEV;71 }72 hidinput = list_entry(hid->inputs.next, struct hid_input, list);73 dev = hidinput->input;74 75 report = hid_validate_values(hid, HID_OUTPUT_REPORT,76 STADIA_FF_REPORT_ID, 0, 2);77 if (!report)78 return -ENODEV;79 80 stadiaff = devm_kzalloc(&hid->dev, sizeof(struct stadiaff_device),81 GFP_KERNEL);82 if (!stadiaff)83 return -ENOMEM;84 85 hid_set_drvdata(hid, stadiaff);86 87 input_set_capability(dev, EV_FF, FF_RUMBLE);88 89 error = input_ff_create_memless(dev, NULL, stadiaff_play);90 if (error)91 return error;92 93 stadiaff->removed = false;94 stadiaff->hid = hid;95 stadiaff->report = report;96 INIT_WORK(&stadiaff->work, stadiaff_work);97 spin_lock_init(&stadiaff->lock);98 99 hid_info(hid, "Force Feedback for Google Stadia controller\n");100 101 return 0;102}103 104static int stadia_probe(struct hid_device *hdev, const struct hid_device_id *id)105{106 int ret;107 108 ret = hid_parse(hdev);109 if (ret) {110 hid_err(hdev, "parse failed\n");111 return ret;112 }113 114 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);115 if (ret) {116 hid_err(hdev, "hw start failed\n");117 return ret;118 }119 120 ret = stadiaff_init(hdev);121 if (ret) {122 hid_err(hdev, "force feedback init failed\n");123 hid_hw_stop(hdev);124 return ret;125 }126 127 return 0;128}129 130static void stadia_remove(struct hid_device *hid)131{132 struct stadiaff_device *stadiaff = hid_get_drvdata(hid);133 unsigned long flags;134 135 spin_lock_irqsave(&stadiaff->lock, flags);136 stadiaff->removed = true;137 spin_unlock_irqrestore(&stadiaff->lock, flags);138 139 cancel_work_sync(&stadiaff->work);140 hid_hw_stop(hid);141}142 143static const struct hid_device_id stadia_devices[] = {144 { HID_USB_DEVICE(USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_STADIA) },145 { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_STADIA) },146 { }147};148MODULE_DEVICE_TABLE(hid, stadia_devices);149 150static struct hid_driver stadia_driver = {151 .name = "stadia",152 .id_table = stadia_devices,153 .probe = stadia_probe,154 .remove = stadia_remove,155};156module_hid_driver(stadia_driver);157 158MODULE_DESCRIPTION("Google Stadia controller rumble support.");159MODULE_LICENSE("GPL");160