drivers/input/mouse/maplemouse.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      SEGA Dreamcast mouse driver
   4  *      Based on drivers/usb/usbmouse.c
   5  *
   6  *      Copyright (c) Yaegashi Takeshi, 2001
   7  *      Copyright (c) Adrian McMenamin, 2008 - 2009
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/slab.h>
  12 #include <linux/input.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/timer.h>
  16 #include <linux/maple.h>
  17
  18 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
  19 MODULE_DESCRIPTION("SEGA Dreamcast mouse driver");
  20 MODULE_LICENSE("GPL");
  21
  22 struct dc_mouse {
  23         struct input_dev *dev;
  24         struct maple_device *mdev;
  25 };
  26
  27 static void dc_mouse_callback(struct mapleq *mq)
  28 {
  29         int buttons, relx, rely, relz;
  30         struct maple_device *mapledev = mq->dev;
  31         struct dc_mouse *mse = maple_get_drvdata(mapledev);
  32         struct input_dev *dev = mse->dev;
  33         unsigned char *res = mq->recvbuf->buf;
  34
  35         buttons = ~res[8];
  36         relx = *(unsigned short *)(res + 12) - 512;
  37         rely = *(unsigned short *)(res + 14) - 512;
  38         relz = *(unsigned short *)(res + 16) - 512;
  39
  40         input_report_key(dev, BTN_LEFT,   buttons & 4);
  41         input_report_key(dev, BTN_MIDDLE, buttons & 9);
  42         input_report_key(dev, BTN_RIGHT,  buttons & 2);
  43         input_report_rel(dev, REL_X,      relx);
  44         input_report_rel(dev, REL_Y,      rely);
  45         input_report_rel(dev, REL_WHEEL,  relz);
  46         input_sync(dev);
  47 }
  48
  49 static int dc_mouse_open(struct input_dev *dev)
  50 {
  51         struct dc_mouse *mse = maple_get_drvdata(to_maple_dev(&dev->dev));
  52
  53         maple_getcond_callback(mse->mdev, dc_mouse_callback, HZ/50,
  54                 MAPLE_FUNC_MOUSE);
  55
  56         return 0;
  57 }
  58
  59 static void dc_mouse_close(struct input_dev *dev)
  60 {
  61         struct dc_mouse *mse = maple_get_drvdata(to_maple_dev(&dev->dev));
  62
  63         maple_getcond_callback(mse->mdev, dc_mouse_callback, 0,
  64                 MAPLE_FUNC_MOUSE);
  65 }
  66
  67 /* allow the mouse to be used */
  68 static int probe_maple_mouse(struct device *dev)
  69 {
  70         struct maple_device *mdev = to_maple_dev(dev);
  71         struct maple_driver *mdrv = to_maple_driver(dev->driver);
  72         int error;
  73         struct input_dev *input_dev;
  74         struct dc_mouse *mse;
  75
  76         mse = kzalloc(sizeof(struct dc_mouse), GFP_KERNEL);
  77         if (!mse) {
  78                 error = -ENOMEM;
  79                 goto fail;
  80         }
  81
  82         input_dev = input_allocate_device();
  83         if (!input_dev) {
  84                 error = -ENOMEM;
  85                 goto fail_nomem;
  86         }
  87
  88         mse->dev = input_dev;
  89         mse->mdev = mdev;
  90
  91         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
  92         input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
  93                 BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
  94         input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y) |
  95                 BIT_MASK(REL_WHEEL);
  96         input_dev->open = dc_mouse_open;
  97         input_dev->close = dc_mouse_close;
  98         input_dev->name = mdev->product_name;
  99         input_dev->id.bustype = BUS_HOST;
 100         error = input_register_device(input_dev);
 101         if (error)
 102                 goto fail_register;
 103
 104         mdev->driver = mdrv;
 105         maple_set_drvdata(mdev, mse);
 106
 107         return error;
 108
 109 fail_register:
 110         input_free_device(input_dev);
 111 fail_nomem:
 112         kfree(mse);
 113 fail:
 114         return error;
 115 }
 116
 117 static int remove_maple_mouse(struct device *dev)
 118 {
 119         struct maple_device *mdev = to_maple_dev(dev);
 120         struct dc_mouse *mse = maple_get_drvdata(mdev);
 121
 122         mdev->callback = NULL;
 123         input_unregister_device(mse->dev);
 124         maple_set_drvdata(mdev, NULL);
 125         kfree(mse);
 126
 127         return 0;
 128 }
 129
 130 static struct maple_driver dc_mouse_driver = {
 131         .function =     MAPLE_FUNC_MOUSE,
 132         .drv = {
 133                 .name = "Dreamcast_mouse",
 134                 .probe = probe_maple_mouse,
 135                 .remove = remove_maple_mouse,
 136         },
 137 };
 138
 139 static int __init dc_mouse_init(void)
 140 {
 141         return maple_driver_register(&dc_mouse_driver);
 142 }
 143
 144 static void __exit dc_mouse_exit(void)
 145 {
 146         maple_driver_unregister(&dc_mouse_driver);
 147 }
 148
 149 module_init(dc_mouse_init);
 150 module_exit(dc_mouse_exit);