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); 151