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dc2f1423f0
It is preferred to use sizeof(*pointer) instead of sizeof(type) due to the type of the variable can change and one needs not change the former (unlike the latter). This patch has no effect on runtime behavior. Signed-off-by: Erick Archer <erick.archer@outlook.com> Link: https://lore.kernel.org/r/AS8PR02MB7237FB736DBF67A58798FDF38BFE2@AS8PR02MB7237.eurprd02.prod.outlook.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* SEGA Dreamcast mouse driver
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* Based on drivers/usb/usbmouse.c
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*
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* Copyright (c) Yaegashi Takeshi, 2001
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* Copyright (c) Adrian McMenamin, 2008 - 2009
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/maple.h>
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MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
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MODULE_DESCRIPTION("SEGA Dreamcast mouse driver");
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MODULE_LICENSE("GPL");
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struct dc_mouse {
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struct input_dev *dev;
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struct maple_device *mdev;
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};
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static void dc_mouse_callback(struct mapleq *mq)
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{
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int buttons, relx, rely, relz;
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struct maple_device *mapledev = mq->dev;
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struct dc_mouse *mse = maple_get_drvdata(mapledev);
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struct input_dev *dev = mse->dev;
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unsigned char *res = mq->recvbuf->buf;
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buttons = ~res[8];
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relx = *(unsigned short *)(res + 12) - 512;
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rely = *(unsigned short *)(res + 14) - 512;
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relz = *(unsigned short *)(res + 16) - 512;
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input_report_key(dev, BTN_LEFT, buttons & 4);
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input_report_key(dev, BTN_MIDDLE, buttons & 9);
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input_report_key(dev, BTN_RIGHT, buttons & 2);
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input_report_rel(dev, REL_X, relx);
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input_report_rel(dev, REL_Y, rely);
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input_report_rel(dev, REL_WHEEL, relz);
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input_sync(dev);
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}
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static int dc_mouse_open(struct input_dev *dev)
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{
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struct dc_mouse *mse = maple_get_drvdata(to_maple_dev(&dev->dev));
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maple_getcond_callback(mse->mdev, dc_mouse_callback, HZ/50,
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MAPLE_FUNC_MOUSE);
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return 0;
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}
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static void dc_mouse_close(struct input_dev *dev)
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{
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struct dc_mouse *mse = maple_get_drvdata(to_maple_dev(&dev->dev));
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maple_getcond_callback(mse->mdev, dc_mouse_callback, 0,
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MAPLE_FUNC_MOUSE);
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}
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/* allow the mouse to be used */
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static int probe_maple_mouse(struct device *dev)
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{
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struct maple_device *mdev = to_maple_dev(dev);
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struct maple_driver *mdrv = to_maple_driver(dev->driver);
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int error;
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struct input_dev *input_dev;
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struct dc_mouse *mse;
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mse = kzalloc(sizeof(*mse), GFP_KERNEL);
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if (!mse) {
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error = -ENOMEM;
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goto fail;
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}
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input_dev = input_allocate_device();
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if (!input_dev) {
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error = -ENOMEM;
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goto fail_nomem;
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}
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mse->dev = input_dev;
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mse->mdev = mdev;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
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input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
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BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
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input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
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BIT_MASK(REL_WHEEL);
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input_dev->open = dc_mouse_open;
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input_dev->close = dc_mouse_close;
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input_dev->name = mdev->product_name;
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input_dev->id.bustype = BUS_HOST;
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error = input_register_device(input_dev);
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if (error)
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goto fail_register;
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mdev->driver = mdrv;
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maple_set_drvdata(mdev, mse);
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return error;
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fail_register:
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input_free_device(input_dev);
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fail_nomem:
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kfree(mse);
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fail:
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return error;
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}
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static int remove_maple_mouse(struct device *dev)
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{
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struct maple_device *mdev = to_maple_dev(dev);
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struct dc_mouse *mse = maple_get_drvdata(mdev);
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mdev->callback = NULL;
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input_unregister_device(mse->dev);
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maple_set_drvdata(mdev, NULL);
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kfree(mse);
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return 0;
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}
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static struct maple_driver dc_mouse_driver = {
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.function = MAPLE_FUNC_MOUSE,
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.drv = {
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.name = "Dreamcast_mouse",
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.probe = probe_maple_mouse,
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.remove = remove_maple_mouse,
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},
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};
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static int __init dc_mouse_init(void)
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{
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return maple_driver_register(&dc_mouse_driver);
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}
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static void __exit dc_mouse_exit(void)
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{
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maple_driver_unregister(&dc_mouse_driver);
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}
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module_init(dc_mouse_init);
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module_exit(dc_mouse_exit);
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