drivers/hid/hid-a4tech.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  HID driver for some a4tech "special" devices
0004  *
0005  *  Copyright (c) 1999 Andreas Gal
0006  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
0007  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
0008  *  Copyright (c) 2006-2007 Jiri Kosina
0009  *  Copyright (c) 2008 Jiri Slaby
0010  */
0011
0012 /*
0013  */
0014
0015 #include <linux/device.h>
0016 #include <linux/input.h>
0017 #include <linux/hid.h>
0018 #include <linux/module.h>
0019 #include <linux/slab.h>
0020
0021 #include "hid-ids.h"
0022
0023 #define A4_2WHEEL_MOUSE_HACK_7  0x01
0024 #define A4_2WHEEL_MOUSE_HACK_B8 0x02
0025
0026 #define A4_WHEEL_ORIENTATION    (HID_UP_GENDESK | 0x000000b8)
0027
0028 struct a4tech_sc {
0029     unsigned long quirks;
0030     unsigned int hw_wheel;
0031     __s32 delayed_value;
0032 };
0033
0034 static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi,
0035                 struct hid_field *field, struct hid_usage *usage,
0036                 unsigned long **bit, int *max)
0037 {
0038     struct a4tech_sc *a4 = hid_get_drvdata(hdev);
0039
0040     if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 &&
0041         usage->hid == A4_WHEEL_ORIENTATION) {
0042         /*
0043          * We do not want to have this usage mapped to anything as it's
0044          * nonstandard and doesn't really behave like an HID report.
0045          * It's only selecting the orientation (vertical/horizontal) of
0046          * the previous mouse wheel report. The input_events will be
0047          * generated once both reports are recorded in a4_event().
0048          */
0049         return -1;
0050     }
0051
0052     return 0;
0053
0054 }
0055
0056 static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
0057         struct hid_field *field, struct hid_usage *usage,
0058         unsigned long **bit, int *max)
0059 {
0060     struct a4tech_sc *a4 = hid_get_drvdata(hdev);
0061
0062     if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
0063         set_bit(REL_HWHEEL, *bit);
0064         set_bit(REL_HWHEEL_HI_RES, *bit);
0065     }
0066
0067     if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
0068         return -1;
0069
0070     return 0;
0071 }
0072
0073 static int a4_event(struct hid_device *hdev, struct hid_field *field,
0074         struct hid_usage *usage, __s32 value)
0075 {
0076     struct a4tech_sc *a4 = hid_get_drvdata(hdev);
0077     struct input_dev *input;
0078
0079     if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
0080         return 0;
0081
0082     input = field->hidinput->input;
0083
0084     if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
0085         if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
0086             a4->delayed_value = value;
0087             return 1;
0088         }
0089
0090         if (usage->hid == A4_WHEEL_ORIENTATION) {
0091             input_event(input, EV_REL, value ? REL_HWHEEL :
0092                     REL_WHEEL, a4->delayed_value);
0093             input_event(input, EV_REL, value ? REL_HWHEEL_HI_RES :
0094                     REL_WHEEL_HI_RES, a4->delayed_value * 120);
0095             return 1;
0096         }
0097     }
0098
0099     if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
0100         a4->hw_wheel = !!value;
0101         return 1;
0102     }
0103
0104     if (usage->code == REL_WHEEL_HI_RES && a4->hw_wheel) {
0105         input_event(input, usage->type, REL_HWHEEL, value);
0106         input_event(input, usage->type, REL_HWHEEL_HI_RES, value * 120);
0107         return 1;
0108     }
0109
0110     return 0;
0111 }
0112
0113 static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
0114 {
0115     struct a4tech_sc *a4;
0116     int ret;
0117
0118     a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
0119     if (a4 == NULL) {
0120         hid_err(hdev, "can't alloc device descriptor\n");
0121         return -ENOMEM;
0122     }
0123
0124     a4->quirks = id->driver_data;
0125
0126     hid_set_drvdata(hdev, a4);
0127
0128     ret = hid_parse(hdev);
0129     if (ret) {
0130         hid_err(hdev, "parse failed\n");
0131         return ret;
0132     }
0133
0134     ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
0135     if (ret) {
0136         hid_err(hdev, "hw start failed\n");
0137         return ret;
0138     }
0139
0140     return 0;
0141 }
0142
0143 static const struct hid_device_id a4_devices[] = {
0144     { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
0145         .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
0146     { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
0147         .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
0148     { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
0149         .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
0150     { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_NB_95),
0151         .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
0152     { }
0153 };
0154 MODULE_DEVICE_TABLE(hid, a4_devices);
0155
0156 static struct hid_driver a4_driver = {
0157     .name = "a4tech",
0158     .id_table = a4_devices,
0159     .input_mapping = a4_input_mapping,
0160     .input_mapped = a4_input_mapped,
0161     .event = a4_event,
0162     .probe = a4_probe,
0163 };
0164 module_hid_driver(a4_driver);
0165
0166 MODULE_LICENSE("GPL");