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) 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                        __u8 tmp;
  45
  46                        rdesc[i] = 0x19;
  47                        rdesc[i + 2] = 0x29;
  48                        tmp = rdesc[i + 3];
  49                        rdesc[i + 3] = rdesc[i + 1];
  50                        rdesc[i + 1] = tmp;
  51                }
  52        return rdesc;
  53}
  54
  55static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  56                struct hid_field *field, struct hid_usage *usage,
  57                unsigned long **bit, int *max)
  58{
  59        unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  60
  61        if (!(quirks & CP_2WHEEL_MOUSE_HACK))
  62                return 0;
  63
  64        if (usage->type == EV_REL && usage->code == REL_WHEEL)
  65                set_bit(REL_HWHEEL, *bit);
  66        if (usage->hid == 0x00090005)
  67                return -1;
  68
  69        return 0;
  70}
  71
  72static int cp_event(struct hid_device *hdev, struct hid_field *field,
  73                struct hid_usage *usage, __s32 value)
  74{
  75        unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  76
  77        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  78                        !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
  79                return 0;
  80
  81        if (usage->hid == 0x00090005) {
  82                if (value)
  83                        quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
  84                else
  85                        quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
  86                hid_set_drvdata(hdev, (void *)quirks);
  87                return 1;
  88        }
  89
  90        if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
  91                struct input_dev *input = field->hidinput->input;
  92
  93                input_event(input, usage->type, REL_HWHEEL, value);
  94                return 1;
  95        }
  96
  97        return 0;
  98}
  99
 100static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 101{
 102        unsigned long quirks = id->driver_data;
 103        int ret;
 104
 105        hid_set_drvdata(hdev, (void *)quirks);
 106
 107        ret = hid_parse(hdev);
 108        if (ret) {
 109                hid_err(hdev, "parse failed\n");
 110                goto err_free;
 111        }
 112
 113        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 114        if (ret) {
 115                hid_err(hdev, "hw start failed\n");
 116                goto err_free;
 117        }
 118
 119        return 0;
 120err_free:
 121        return ret;
 122}
 123
 124static const struct hid_device_id cp_devices[] = {
 125        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
 126                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 127        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
 128                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 129        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
 130                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 131        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
 132                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 133        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
 134                .driver_data = CP_2WHEEL_MOUSE_HACK },
 135        { }
 136};
 137MODULE_DEVICE_TABLE(hid, cp_devices);
 138
 139static struct hid_driver cp_driver = {
 140        .name = "cypress",
 141        .id_table = cp_devices,
 142        .report_fixup = cp_report_fixup,
 143        .input_mapped = cp_input_mapped,
 144        .event = cp_event,
 145        .probe = cp_probe,
 146};
 147
 148static int __init cp_init(void)
 149{
 150        return hid_register_driver(&cp_driver);
 151}
 152
 153static void __exit cp_exit(void)
 154{
 155        hid_unregister_driver(&cp_driver);
 156}
 157
 158module_init(cp_init);
 159module_exit(cp_exit);
 160MODULE_LICENSE("GPL");
 161
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