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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* HID driver for some cypress "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/hid.h>
#include <linux/input.h>
#include <linux/module.h>
#include "hid-ids.h"
#define CP_RDESC_SWAPPED_MIN_MAX 0x01
#define CP_2WHEEL_MOUSE_HACK 0x02
#define CP_2WHEEL_MOUSE_HACK_ON 0x04
#define VA_INVAL_LOGICAL_BOUNDARY 0x08
/*
* Some USB barcode readers from cypress have usage min and usage max in
* the wrong order
*/
static __u8 *cp_rdesc_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
unsigned int i;
if (*rsize < 4)
return rdesc;
for (i = 0; i < *rsize - 4; i++)
if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
rdesc[i] = 0x19;
rdesc[i + 2] = 0x29;
swap(rdesc[i + 3], rdesc[i + 1]);
}
return rdesc;
}
static __u8 *va_logical_boundary_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
/*
* Varmilo VA104M (with VID Cypress and device ID 07B1) incorrectly
* reports Logical Minimum of its Consumer Control device as 572
* (0x02 0x3c). Fix this by setting its Logical Minimum to zero.
*/
if (*rsize == 25 &&
rdesc[0] == 0x05 && rdesc[1] == 0x0c &&
rdesc[2] == 0x09 && rdesc[3] == 0x01 &&
rdesc[6] == 0x19 && rdesc[7] == 0x00 &&
rdesc[11] == 0x16 && rdesc[12] == 0x3c && rdesc[13] == 0x02) {
hid_info(hdev,
"fixing up varmilo VA104M consumer control report descriptor\n");
rdesc[12] = 0x00;
rdesc[13] = 0x00;
}
return rdesc;
}
static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
if (quirks & CP_RDESC_SWAPPED_MIN_MAX)
rdesc = cp_rdesc_fixup(hdev, rdesc, rsize);
if (quirks & VA_INVAL_LOGICAL_BOUNDARY)
rdesc = va_logical_boundary_fixup(hdev, rdesc, rsize);
return rdesc;
}
static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max)
{
unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
if (!(quirks & CP_2WHEEL_MOUSE_HACK))
return 0;
if (usage->type == EV_REL && usage->code == REL_WHEEL)
set_bit(REL_HWHEEL, *bit);
if (usage->hid == 0x00090005)
return -1;
return 0;
}
static int cp_event(struct hid_device *hdev, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
!usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
return 0;
if (usage->hid == 0x00090005) {
if (value)
quirks |= CP_2WHEEL_MOUSE_HACK_ON;
else
quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
hid_set_drvdata(hdev, (void *)quirks);
return 1;
}
if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
struct input_dev *input = field->hidinput->input;
input_event(input, usage->type, REL_HWHEEL, value);
return 1;
}
return 0;
}
static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
unsigned long quirks = id->driver_data;
int ret;
hid_set_drvdata(hdev, (void *)quirks);
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed\n");
goto err_free;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
if (ret) {
hid_err(hdev, "hw start failed\n");
goto err_free;
}
return 0;
err_free:
return ret;
}
static const struct hid_device_id cp_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
.driver_data = CP_2WHEEL_MOUSE_HACK },
{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_VARMILO_VA104M_07B1),
.driver_data = VA_INVAL_LOGICAL_BOUNDARY },
{ }
};
MODULE_DEVICE_TABLE(hid, cp_devices);
static struct hid_driver cp_driver = {
.name = "cypress",
.id_table = cp_devices,
.report_fixup = cp_report_fixup,
.input_mapped = cp_input_mapped,
.event = cp_event,
.probe = cp_probe,
};
module_hid_driver(cp_driver);
MODULE_LICENSE("GPL");
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