1/*
  2 *  HID driver for some cypress "special" devices
  3 *
  4 *  Copyright (c) 1999 Andreas Gal
  5 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
  6 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
  7 *  Copyright (c) 2006-2007 Jiri Kosina
  8 *  Copyright (c) 2008 Jiri Slaby
  9 */
 10
 11/*
 12 * This program is free software; you can redistribute it and/or modify it
 13 * under the terms of the GNU General Public License as published by the Free
 14 * Software Foundation; either version 2 of the License, or (at your option)
 15 * any later version.
 16 */
 17
 18#include <linux/device.h>
 19#include <linux/hid.h>
 20#include <linux/input.h>
 21#include <linux/module.h>
 22
 23#include "hid-ids.h"
 24
 25#define CP_RDESC_SWAPPED_MIN_MAX	0x01
 26#define CP_2WHEEL_MOUSE_HACK		0x02
 27#define CP_2WHEEL_MOUSE_HACK_ON		0x04
 28
 29/*
 30 * Some USB barcode readers from cypress have usage min and usage max in
 31 * the wrong order
 32 */
 33static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 34		unsigned int *rsize)
 35{
 36	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 37	unsigned int i;
 38
 39	if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX))
 40		return rdesc;
 41
 42	for (i = 0; i < *rsize - 4; i++)
 43		if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
 44			rdesc[i] = 0x19;
 45			rdesc[i + 2] = 0x29;
 46			swap(rdesc[i + 3], rdesc[i + 1]);
 47		}
 48	return rdesc;
 49}
 50
 51static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 52		struct hid_field *field, struct hid_usage *usage,
 53		unsigned long **bit, int *max)
 54{
 55	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 56
 57	if (!(quirks & CP_2WHEEL_MOUSE_HACK))
 58		return 0;
 59
 60	if (usage->type == EV_REL && usage->code == REL_WHEEL)
 61		set_bit(REL_HWHEEL, *bit);
 62	if (usage->hid == 0x00090005)
 63		return -1;
 64
 65	return 0;
 66}
 67
 68static int cp_event(struct hid_device *hdev, struct hid_field *field,
 69		struct hid_usage *usage, __s32 value)
 70{
 71	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 72
 73	if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
 74			!usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
 75		return 0;
 76
 77	if (usage->hid == 0x00090005) {
 78		if (value)
 79			quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
 80		else
 81			quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
 82		hid_set_drvdata(hdev, (void *)quirks);
 83		return 1;
 84	}
 85
 86	if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
 87		struct input_dev *input = field->hidinput->input;
 88
 89		input_event(input, usage->type, REL_HWHEEL, value);
 90		return 1;
 91	}
 92
 93	return 0;
 94}
 95
 96static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 97{
 98	unsigned long quirks = id->driver_data;
 99	int ret;
100
101	hid_set_drvdata(hdev, (void *)quirks);
102
103	ret = hid_parse(hdev);
104	if (ret) {
105		hid_err(hdev, "parse failed\n");
106		goto err_free;
107	}
108
109	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
110	if (ret) {
111		hid_err(hdev, "hw start failed\n");
112		goto err_free;
113	}
114
115	return 0;
116err_free:
117	return ret;
118}
119
120static const struct hid_device_id cp_devices[] = {
121	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
122		.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
123	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
124		.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
125	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
126		.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
127	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
128		.driver_data = CP_RDESC_SWAPPED_MIN_MAX },
129	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
130		.driver_data = CP_2WHEEL_MOUSE_HACK },
131	{ }
132};
133MODULE_DEVICE_TABLE(hid, cp_devices);
134
135static struct hid_driver cp_driver = {
136	.name = "cypress",
137	.id_table = cp_devices,
138	.report_fixup = cp_report_fixup,
139	.input_mapped = cp_input_mapped,
140	.event = cp_event,
141	.probe = cp_probe,
142};
143module_hid_driver(cp_driver);
144
145MODULE_LICENSE("GPL");