linux/drivers/hid/hid-cypress.c
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   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) 2007 Paul Walmsley
   9 *  Copyright (c) 2008 Jiri Slaby
  10 */
  11
  12/*
  13 * This program is free software; you can redistribute it and/or modify it
  14 * under the terms of the GNU General Public License as published by the Free
  15 * Software Foundation; either version 2 of the License, or (at your option)
  16 * any later version.
  17 */
  18
  19#include <linux/device.h>
  20#include <linux/hid.h>
  21#include <linux/input.h>
  22#include <linux/module.h>
  23
  24#include "hid-ids.h"
  25
  26#define CP_RDESC_SWAPPED_MIN_MAX        0x01
  27#define CP_2WHEEL_MOUSE_HACK            0x02
  28#define CP_2WHEEL_MOUSE_HACK_ON         0x04
  29
  30/*
  31 * Some USB barcode readers from cypress have usage min and usage max in
  32 * the wrong order
  33 */
  34static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  35                unsigned int *rsize)
  36{
  37        unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  38        unsigned int i;
  39
  40        if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX))
  41                return rdesc;
  42
  43        for (i = 0; i < *rsize - 4; i++)
  44                if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
  45                        __u8 tmp;
  46
  47                        rdesc[i] = 0x19;
  48                        rdesc[i + 2] = 0x29;
  49                        tmp = rdesc[i + 3];
  50                        rdesc[i + 3] = rdesc[i + 1];
  51                        rdesc[i + 1] = tmp;
  52                }
  53        return rdesc;
  54}
  55
  56static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  57                struct hid_field *field, struct hid_usage *usage,
  58                unsigned long **bit, int *max)
  59{
  60        unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  61
  62        if (!(quirks & CP_2WHEEL_MOUSE_HACK))
  63                return 0;
  64
  65        if (usage->type == EV_REL && usage->code == REL_WHEEL)
  66                set_bit(REL_HWHEEL, *bit);
  67        if (usage->hid == 0x00090005)
  68                return -1;
  69
  70        return 0;
  71}
  72
  73static int cp_event(struct hid_device *hdev, struct hid_field *field,
  74                struct hid_usage *usage, __s32 value)
  75{
  76        unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  77
  78        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  79                        !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
  80                return 0;
  81
  82        if (usage->hid == 0x00090005) {
  83                if (value)
  84                        quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
  85                else
  86                        quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
  87                hid_set_drvdata(hdev, (void *)quirks);
  88                return 1;
  89        }
  90
  91        if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
  92                struct input_dev *input = field->hidinput->input;
  93
  94                input_event(input, usage->type, REL_HWHEEL, value);
  95                return 1;
  96        }
  97
  98        return 0;
  99}
 100
 101static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 102{
 103        unsigned long quirks = id->driver_data;
 104        int ret;
 105
 106        hid_set_drvdata(hdev, (void *)quirks);
 107
 108        ret = hid_parse(hdev);
 109        if (ret) {
 110                hid_err(hdev, "parse failed\n");
 111                goto err_free;
 112        }
 113
 114        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 115        if (ret) {
 116                hid_err(hdev, "hw start failed\n");
 117                goto err_free;
 118        }
 119
 120        return 0;
 121err_free:
 122        return ret;
 123}
 124
 125static const struct hid_device_id cp_devices[] = {
 126        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
 127                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 128        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
 129                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 130        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
 131                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 132        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
 133                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 134        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
 135                .driver_data = CP_2WHEEL_MOUSE_HACK },
 136        { }
 137};
 138MODULE_DEVICE_TABLE(hid, cp_devices);
 139
 140static struct hid_driver cp_driver = {
 141        .name = "cypress",
 142        .id_table = cp_devices,
 143        .report_fixup = cp_report_fixup,
 144        .input_mapped = cp_input_mapped,
 145        .event = cp_event,
 146        .probe = cp_probe,
 147};
 148
 149static int __init cp_init(void)
 150{
 151        return hid_register_driver(&cp_driver);
 152}
 153
 154static void __exit cp_exit(void)
 155{
 156        hid_unregister_driver(&cp_driver);
 157}
 158
 159module_init(cp_init);
 160module_exit(cp_exit);
 161MODULE_LICENSE("GPL");
 162
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