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 #define A4_WHEEL_ORIENTATION (HID_UP_GENDESK | 0x000000b8) 27 28 struct a4tech_sc { 29 unsigned long quirks; 30 unsigned int hw_wheel; 31 __s32 delayed_value; 32 }; 33 34 static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi, 35 struct hid_field *field, struct hid_usage *usage, 36 unsigned long **bit, int *max) 37 { 38 struct a4tech_sc *a4 = hid_get_drvdata(hdev); 39 40 if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 && 41 usage->hid == A4_WHEEL_ORIENTATION) { 42 /* 43 * We do not want to have this usage mapped to anything as it's 44 * nonstandard and doesn't really behave like an HID report. 45 * It's only selecting the orientation (vertical/horizontal) of 46 * the previous mouse wheel report. The input_events will be 47 * generated once both reports are recorded in a4_event(). 48 */ 49 return -1; 50 } 51 52 return 0; 53 54 } 55 56 static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi, 57 struct hid_field *field, struct hid_usage *usage, 58 unsigned long **bit, int *max) 59 { 60 struct a4tech_sc *a4 = hid_get_drvdata(hdev); 61 62 if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) { 63 set_bit(REL_HWHEEL, *bit); 64 set_bit(REL_HWHEEL_HI_RES, *bit); 65 } 66 67 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) 68 return -1; 69 70 return 0; 71 } 72 73 static int a4_event(struct hid_device *hdev, struct hid_field *field, 74 struct hid_usage *usage, __s32 value) 75 { 76 struct a4tech_sc *a4 = hid_get_drvdata(hdev); 77 struct input_dev *input; 78 79 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput) 80 return 0; 81 82 input = field->hidinput->input; 83 84 if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) { 85 if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) { 86 a4->delayed_value = value; 87 return 1; 88 } 89 90 if (usage->hid == A4_WHEEL_ORIENTATION) { 91 input_event(input, EV_REL, value ? REL_HWHEEL : 92 REL_WHEEL, a4->delayed_value); 93 input_event(input, EV_REL, value ? REL_HWHEEL_HI_RES : 94 REL_WHEEL_HI_RES, a4->delayed_value * 120); 95 return 1; 96 } 97 } 98 99 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) { 100 a4->hw_wheel = !!value; 101 return 1; 102 } 103 104 if (usage->code == REL_WHEEL_HI_RES && a4->hw_wheel) { 105 input_event(input, usage->type, REL_HWHEEL, value); 106 input_event(input, usage->type, REL_HWHEEL_HI_RES, value * 120); 107 return 1; 108 } 109 110 return 0; 111 } 112 113 static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id) 114 { 115 struct a4tech_sc *a4; 116 int ret; 117 118 a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL); 119 if (a4 == NULL) { 120 hid_err(hdev, "can't alloc device descriptor\n"); 121 return -ENOMEM; 122 } 123 124 a4->quirks = id->driver_data; 125 126 hid_set_drvdata(hdev, a4); 127 128 ret = hid_parse(hdev); 129 if (ret) { 130 hid_err(hdev, "parse failed\n"); 131 return ret; 132 } 133 134 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); 135 if (ret) { 136 hid_err(hdev, "hw start failed\n"); 137 return ret; 138 } 139 140 return 0; 141 } 142 143 static const struct hid_device_id a4_devices[] = { 144 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU), 145 .driver_data = A4_2WHEEL_MOUSE_HACK_7 }, 146 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D), 147 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, 148 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649), 149 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, 150 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_NB_95), 151 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, 152 { } 153 }; 154 MODULE_DEVICE_TABLE(hid, a4_devices); 155 156 static struct hid_driver a4_driver = { 157 .name = "a4tech", 158 .id_table = a4_devices, 159 .input_mapping = a4_input_mapping, 160 .input_mapped = a4_input_mapped, 161 .event = a4_event, 162 .probe = a4_probe, 163 }; 164 module_hid_driver(a4_driver); 165 166 MODULE_LICENSE("GPL"); 167