1 /* 2 * HID driver for some a4tech "special" devices 3 * 4 * Copyright (c) 1999 Andreas Gal 5 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> 6 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc 7 * Copyright (c) 2006-2007 Jiri Kosina 8 * Copyright (c) 2007 Paul Walmsley 9 * Copyright (c) 2008 Jiri Slaby 10 */ 11 12 /* 13 * This program is free software; you can redistribute it and/or modify it 14 * under the terms of the GNU General Public License as published by the Free 15 * Software Foundation; either version 2 of the License, or (at your option) 16 * any later version. 17 */ 18 19 #include <linux/device.h> 20 #include <linux/input.h> 21 #include <linux/hid.h> 22 #include <linux/module.h> 23 #include <linux/slab.h> 24 25 #include "hid-ids.h" 26 27 #define A4_2WHEEL_MOUSE_HACK_7 0x01 28 #define A4_2WHEEL_MOUSE_HACK_B8 0x02 29 30 struct a4tech_sc { 31 unsigned long quirks; 32 unsigned int hw_wheel; 33 __s32 delayed_value; 34 }; 35 36 static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi, 37 struct hid_field *field, struct hid_usage *usage, 38 unsigned long **bit, int *max) 39 { 40 struct a4tech_sc *a4 = hid_get_drvdata(hdev); 41 42 if (usage->type == EV_REL && usage->code == REL_WHEEL) 43 set_bit(REL_HWHEEL, *bit); 44 45 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) 46 return -1; 47 48 return 0; 49 } 50 51 static int a4_event(struct hid_device *hdev, struct hid_field *field, 52 struct hid_usage *usage, __s32 value) 53 { 54 struct a4tech_sc *a4 = hid_get_drvdata(hdev); 55 struct input_dev *input; 56 57 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput || 58 !usage->type) 59 return 0; 60 61 input = field->hidinput->input; 62 63 if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) { 64 if (usage->type == EV_REL && usage->code == REL_WHEEL) { 65 a4->delayed_value = value; 66 return 1; 67 } 68 69 if (usage->hid == 0x000100b8) { 70 input_event(input, EV_REL, value ? REL_HWHEEL : 71 REL_WHEEL, a4->delayed_value); 72 return 1; 73 } 74 } 75 76 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) { 77 a4->hw_wheel = !!value; 78 return 1; 79 } 80 81 if (usage->code == REL_WHEEL && a4->hw_wheel) { 82 input_event(input, usage->type, REL_HWHEEL, value); 83 return 1; 84 } 85 86 return 0; 87 } 88 89 static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id) 90 { 91 struct a4tech_sc *a4; 92 int ret; 93 94 a4 = kzalloc(sizeof(*a4), GFP_KERNEL); 95 if (a4 == NULL) { 96 dev_err(&hdev->dev, "can't alloc device descriptor\n"); 97 ret = -ENOMEM; 98 goto err_free; 99 } 100 101 a4->quirks = id->driver_data; 102 103 hid_set_drvdata(hdev, a4); 104 105 ret = hid_parse(hdev); 106 if (ret) { 107 dev_err(&hdev->dev, "parse failed\n"); 108 goto err_free; 109 } 110 111 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); 112 if (ret) { 113 dev_err(&hdev->dev, "hw start failed\n"); 114 goto err_free; 115 } 116 117 return 0; 118 err_free: 119 kfree(a4); 120 return ret; 121 } 122 123 static void a4_remove(struct hid_device *hdev) 124 { 125 struct a4tech_sc *a4 = hid_get_drvdata(hdev); 126 127 hid_hw_stop(hdev); 128 kfree(a4); 129 } 130 131 static const struct hid_device_id a4_devices[] = { 132 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU), 133 .driver_data = A4_2WHEEL_MOUSE_HACK_7 }, 134 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D), 135 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, 136 { } 137 }; 138 MODULE_DEVICE_TABLE(hid, a4_devices); 139 140 static struct hid_driver a4_driver = { 141 .name = "a4tech", 142 .id_table = a4_devices, 143 .input_mapped = a4_input_mapped, 144 .event = a4_event, 145 .probe = a4_probe, 146 .remove = a4_remove, 147 }; 148 149 static int __init a4_init(void) 150 { 151 return hid_register_driver(&a4_driver); 152 } 153 154 static void __exit a4_exit(void) 155 { 156 hid_unregister_driver(&a4_driver); 157 } 158 159 module_init(a4_init); 160 module_exit(a4_exit); 161 MODULE_LICENSE("GPL"); 162