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_HI_RES) { 39 set_bit(REL_HWHEEL, *bit); 40 set_bit(REL_HWHEEL_HI_RES, *bit); 41 } 42 43 if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) 44 return -1; 45 46 return 0; 47 } 48 49 static int a4_event(struct hid_device *hdev, struct hid_field *field, 50 struct hid_usage *usage, __s32 value) 51 { 52 struct a4tech_sc *a4 = hid_get_drvdata(hdev); 53 struct input_dev *input; 54 55 if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput || 56 !usage->type) 57 return 0; 58 59 input = field->hidinput->input; 60 61 if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) { 62 if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) { 63 a4->delayed_value = value; 64 return 1; 65 } 66 67 if (usage->hid == 0x000100b8) { 68 input_event(input, EV_REL, value ? REL_HWHEEL : 69 REL_WHEEL, a4->delayed_value); 70 input_event(input, EV_REL, value ? REL_HWHEEL_HI_RES : 71 REL_WHEEL_HI_RES, a4->delayed_value * 120); 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_HI_RES && a4->hw_wheel) { 82 input_event(input, usage->type, REL_HWHEEL, value); 83 input_event(input, usage->type, REL_HWHEEL_HI_RES, value * 120); 84 return 1; 85 } 86 87 return 0; 88 } 89 90 static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id) 91 { 92 struct a4tech_sc *a4; 93 int ret; 94 95 a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL); 96 if (a4 == NULL) { 97 hid_err(hdev, "can't alloc device descriptor\n"); 98 return -ENOMEM; 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 hid_err(hdev, "parse failed\n"); 108 return ret; 109 } 110 111 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); 112 if (ret) { 113 hid_err(hdev, "hw start failed\n"); 114 return ret; 115 } 116 117 return 0; 118 } 119 120 static const struct hid_device_id a4_devices[] = { 121 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU), 122 .driver_data = A4_2WHEEL_MOUSE_HACK_7 }, 123 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D), 124 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, 125 { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649), 126 .driver_data = A4_2WHEEL_MOUSE_HACK_B8 }, 127 { } 128 }; 129 MODULE_DEVICE_TABLE(hid, a4_devices); 130 131 static struct hid_driver a4_driver = { 132 .name = "a4tech", 133 .id_table = a4_devices, 134 .input_mapped = a4_input_mapped, 135 .event = a4_event, 136 .probe = a4_probe, 137 }; 138 module_hid_driver(a4_driver); 139 140 MODULE_LICENSE("GPL"); 141