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-rw-r--r--drivers/hid/hid-a4tech.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/hid/hid-a4tech.c b/drivers/hid/hid-a4tech.c
new file mode 100644
index 000000000..2cbc32dda
--- /dev/null
+++ b/drivers/hid/hid-a4tech.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * HID driver for some a4tech "special" devices
+ *
+ * Copyright (c) 1999 Andreas Gal
+ * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
+ * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
+ * Copyright (c) 2006-2007 Jiri Kosina
+ * Copyright (c) 2008 Jiri Slaby
+ */
+
+/*
+ */
+
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include "hid-ids.h"
+
+#define A4_2WHEEL_MOUSE_HACK_7 0x01
+#define A4_2WHEEL_MOUSE_HACK_B8 0x02
+
+#define A4_WHEEL_ORIENTATION (HID_UP_GENDESK | 0x000000b8)
+
+struct a4tech_sc {
+ unsigned long quirks;
+ unsigned int hw_wheel;
+ __s32 delayed_value;
+};
+
+static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ struct a4tech_sc *a4 = hid_get_drvdata(hdev);
+
+ if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 &&
+ usage->hid == A4_WHEEL_ORIENTATION) {
+ /*
+ * We do not want to have this usage mapped to anything as it's
+ * nonstandard and doesn't really behave like an HID report.
+ * It's only selecting the orientation (vertical/horizontal) of
+ * the previous mouse wheel report. The input_events will be
+ * generated once both reports are recorded in a4_event().
+ */
+ return -1;
+ }
+
+ return 0;
+
+}
+
+static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ struct a4tech_sc *a4 = hid_get_drvdata(hdev);
+
+ if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
+ set_bit(REL_HWHEEL, *bit);
+ set_bit(REL_HWHEEL_HI_RES, *bit);
+ }
+
+ if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
+ return -1;
+
+ return 0;
+}
+
+static int a4_event(struct hid_device *hdev, struct hid_field *field,
+ struct hid_usage *usage, __s32 value)
+{
+ struct a4tech_sc *a4 = hid_get_drvdata(hdev);
+ struct input_dev *input;
+
+ if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
+ return 0;
+
+ input = field->hidinput->input;
+
+ if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
+ if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
+ a4->delayed_value = value;
+ return 1;
+ }
+
+ if (usage->hid == A4_WHEEL_ORIENTATION) {
+ input_event(input, EV_REL, value ? REL_HWHEEL :
+ REL_WHEEL, a4->delayed_value);
+ input_event(input, EV_REL, value ? REL_HWHEEL_HI_RES :
+ REL_WHEEL_HI_RES, a4->delayed_value * 120);
+ return 1;
+ }
+ }
+
+ if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
+ a4->hw_wheel = !!value;
+ return 1;
+ }
+
+ if (usage->code == REL_WHEEL_HI_RES && a4->hw_wheel) {
+ input_event(input, usage->type, REL_HWHEEL, value);
+ input_event(input, usage->type, REL_HWHEEL_HI_RES, value * 120);
+ return 1;
+ }
+
+ return 0;
+}
+
+static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+ struct a4tech_sc *a4;
+ int ret;
+
+ a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
+ if (a4 == NULL) {
+ hid_err(hdev, "can't alloc device descriptor\n");
+ return -ENOMEM;
+ }
+
+ a4->quirks = id->driver_data;
+
+ hid_set_drvdata(hdev, a4);
+
+ ret = hid_parse(hdev);
+ if (ret) {
+ hid_err(hdev, "parse failed\n");
+ return ret;
+ }
+
+ ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+ if (ret) {
+ hid_err(hdev, "hw start failed\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct hid_device_id a4_devices[] = {
+ { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
+ .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
+ { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
+ .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
+ { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
+ .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
+ { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_NB_95),
+ .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
+ { }
+};
+MODULE_DEVICE_TABLE(hid, a4_devices);
+
+static struct hid_driver a4_driver = {
+ .name = "a4tech",
+ .id_table = a4_devices,
+ .input_mapping = a4_input_mapping,
+ .input_mapped = a4_input_mapped,
+ .event = a4_event,
+ .probe = a4_probe,
+};
+module_hid_driver(a4_driver);
+
+MODULE_LICENSE("GPL");