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/*
* HID driver for Nintendo Wiimote devices
* Copyright (c) 2011 David Herrmann
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <linux/atomic.h>
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/module.h>
#include "hid-ids.h"
#define WIIMOTE_VERSION "0.1"
#define WIIMOTE_NAME "Nintendo Wii Remote"
struct wiimote_data {
atomic_t ready;
struct hid_device *hdev;
struct input_dev *input;
};
static int wiimote_input_event(struct input_dev *dev, unsigned int type,
unsigned int code, int value)
{
struct wiimote_data *wdata = input_get_drvdata(dev);
if (!atomic_read(&wdata->ready))
return -EBUSY;
/* smp_rmb: Make sure wdata->xy is available when wdata->ready is 1 */
smp_rmb();
return 0;
}
static int wiimote_hid_event(struct hid_device *hdev, struct hid_report *report,
u8 *raw_data, int size)
{
struct wiimote_data *wdata = hid_get_drvdata(hdev);
if (!atomic_read(&wdata->ready))
return -EBUSY;
/* smp_rmb: Make sure wdata->xy is available when wdata->ready is 1 */
smp_rmb();
if (size < 1)
return -EINVAL;
return 0;
}
static struct wiimote_data *wiimote_create(struct hid_device *hdev)
{
struct wiimote_data *wdata;
wdata = kzalloc(sizeof(*wdata), GFP_KERNEL);
if (!wdata)
return NULL;
wdata->input = input_allocate_device();
if (!wdata->input) {
kfree(wdata);
return NULL;
}
wdata->hdev = hdev;
hid_set_drvdata(hdev, wdata);
input_set_drvdata(wdata->input, wdata);
wdata->input->event = wiimote_input_event;
wdata->input->dev.parent = &wdata->hdev->dev;
wdata->input->id.bustype = wdata->hdev->bus;
wdata->input->id.vendor = wdata->hdev->vendor;
wdata->input->id.product = wdata->hdev->product;
wdata->input->id.version = wdata->hdev->version;
wdata->input->name = WIIMOTE_NAME;
return wdata;
}
static void wiimote_destroy(struct wiimote_data *wdata)
{
kfree(wdata);
}
static int wiimote_hid_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
struct wiimote_data *wdata;
int ret;
wdata = wiimote_create(hdev);
if (!wdata) {
hid_err(hdev, "Can't alloc device\n");
return -ENOMEM;
}
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "HID parse failed\n");
goto err;
}
ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
if (ret) {
hid_err(hdev, "HW start failed\n");
goto err;
}
ret = input_register_device(wdata->input);
if (ret) {
hid_err(hdev, "Cannot register input device\n");
goto err_stop;
}
/* smp_wmb: Write wdata->xy first before wdata->ready is set to 1 */
smp_wmb();
atomic_set(&wdata->ready, 1);
hid_info(hdev, "New device registered\n");
return 0;
err_stop:
hid_hw_stop(hdev);
err:
input_free_device(wdata->input);
wiimote_destroy(wdata);
return ret;
}
static void wiimote_hid_remove(struct hid_device *hdev)
{
struct wiimote_data *wdata = hid_get_drvdata(hdev);
hid_info(hdev, "Device removed\n");
hid_hw_stop(hdev);
input_unregister_device(wdata->input);
wiimote_destroy(wdata);
}
static const struct hid_device_id wiimote_hid_devices[] = {
{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NINTENDO,
USB_DEVICE_ID_NINTENDO_WIIMOTE) },
{ }
};
MODULE_DEVICE_TABLE(hid, wiimote_hid_devices);
static struct hid_driver wiimote_hid_driver = {
.name = "wiimote",
.id_table = wiimote_hid_devices,
.probe = wiimote_hid_probe,
.remove = wiimote_hid_remove,
.raw_event = wiimote_hid_event,
};
static int __init wiimote_init(void)
{
int ret;
ret = hid_register_driver(&wiimote_hid_driver);
if (ret)
pr_err("Can't register wiimote hid driver\n");
return ret;
}
static void __exit wiimote_exit(void)
{
hid_unregister_driver(&wiimote_hid_driver);
}
module_init(wiimote_init);
module_exit(wiimote_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
MODULE_DESCRIPTION(WIIMOTE_NAME " Device Driver");
MODULE_VERSION(WIIMOTE_VERSION);
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