1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * HID driver for some a4tech "special" devices 4 * 5 * Copyright (c) 1999 Andreas Gal 6 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> 7 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc 8 * Copyright (c) 2006-2007 Jiri Kosina 9 * Copyright (c) 2008 Jiri Slaby 10 */ 11 12 /* 13 */ 14 15 #include <linux/device.h> 16 #include <linux/input.h> 17 #include <linux/hid.h> 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 21 #include "hid-ids.h" 22 23 #define A4_2WHEEL_MOUSE_HACK_7 0x01 24 #define A4_2WHEEL_MOUSE_HACK_B8 0x02 25 26 struct a4tech_sc { 27 unsigned long quirks; 28 unsigned int hw_wheel; 29 __s32 delayed_value; 30 }; 31 32 static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi, 33 struct hid_field *field, struct hid_usage *usage, 34 unsigned long **bit, int *max) 35 { 36 struct a4tech_sc *a4 = hid_get_drvdata(hdev); 37 38 if (usage->type == EV_REL && usage->code == REL_WHEEL) 39 set_bit(REL_HWHEEL, *bit); 40 41 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) 42 return -1; 43 44 return 0; 45 } 46 47 static int a4_event(struct hid_device *hdev, struct hid_field *field, 48 struct hid_usage *usage, __s32 value) 49 { 50 struct a4tech_sc *a4 = hid_get_drvdata(hdev); 51 struct input_dev *input; 52 53 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput || 54 !usage->type) 55 return 0; 56 57 input = field->hidinput->input; 58 59 if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) { 60 if (usage->type == EV_REL && usage->code == REL_WHEEL) { 61 a4->delayed_value = value; 62 return 1; 63 } 64 65 if (usage->hid == 0x000100b8) { 66 input_event(input, EV_REL, value ? REL_HWHEEL : 67 REL_WHEEL, a4->delayed_value); 68 return 1; 69 } 70 } 71 72 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) { 73 a4->hw_wheel = !!value; 74 return 1; 75 } 76 77 if (usage->code == REL_WHEEL && a4->hw_wheel) { 78 input_event(input, usage->type, REL_HWHEEL, value); 79 return 1; 80 } 81 82 return 0; 83 } 84 85 static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id) 86 { 87 struct a4tech_sc *a4; 88 int ret; 89 90 a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL); 91 if (a4 == NULL) { 92 hid_err(hdev, "can't alloc device descriptor\n"); 93 return -ENOMEM; 94 } 95 96 a4->quirks = id->driver_data; 97 98 hid_set_drvdata(hdev, a4); 99 100 ret = hid_parse(hdev); 101 if (ret) { 102 hid_err(hdev, "parse failed\n"); 103 return ret; 104 } 105 106 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); 107 if (ret) { 108 hid_err(hdev, "hw start failed\n"); 109 return ret; 110 } 111 112 return 0; 113 } 114 115 static const struct hid_device_id a4_devices[] = { 116 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU), 117 .driver_data = A4_2WHEEL_MOUSE_HACK_7 }, 118 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D), 119 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, 120 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649), 121 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, 122 { } 123 }; 124 MODULE_DEVICE_TABLE(hid, a4_devices); 125 126 static struct hid_driver a4_driver = { 127 .name = "a4tech", 128 .id_table = a4_devices, 129 .input_mapped = a4_input_mapped, 130 .event = a4_event, 131 .probe = a4_probe, 132 }; 133 module_hid_driver(a4_driver); 134 135 MODULE_LICENSE("GPL"); 136