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        if (*rsize < 4)
  43                return rdesc;
  44
  45        for (i = 0; i < *rsize - 4; i++)
  46                if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
  47                        rdesc[i] = 0x19;
  48                        rdesc[i + 2] = 0x29;
  49                        swap(rdesc[i + 3], rdesc[i + 1]);
  50                }
  51        return rdesc;
  52}
  53
  54static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  55                struct hid_field *field, struct hid_usage *usage,
  56                unsigned long **bit, int *max)
  57{
  58        unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  59
  60        if (!(quirks & CP_2WHEEL_MOUSE_HACK))
  61                return 0;
  62
  63        if (usage->type == EV_REL && usage->code == REL_WHEEL)
  64                set_bit(REL_HWHEEL, *bit);
  65        if (usage->hid == 0x00090005)
  66                return -1;
  67
  68        return 0;
  69}
  70
  71static int cp_event(struct hid_device *hdev, struct hid_field *field,
  72                struct hid_usage *usage, __s32 value)
  73{
  74        unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  75
  76        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  77                        !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
  78                return 0;
  79
  80        if (usage->hid == 0x00090005) {
  81                if (value)
  82                        quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
  83                else
  84                        quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
  85                hid_set_drvdata(hdev, (void *)quirks);
  86                return 1;
  87        }
  88
  89        if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
  90                struct input_dev *input = field->hidinput->input;
  91
  92                input_event(input, usage->type, REL_HWHEEL, value);
  93                return 1;
  94        }
  95
  96        return 0;
  97}
  98
  99static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 100{
 101        unsigned long quirks = id->driver_data;
 102        int ret;
 103
 104        hid_set_drvdata(hdev, (void *)quirks);
 105
 106        ret = hid_parse(hdev);
 107        if (ret) {
 108                hid_err(hdev, "parse failed\n");
 109                goto err_free;
 110        }
 111
 112        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 113        if (ret) {
 114                hid_err(hdev, "hw start failed\n");
 115                goto err_free;
 116        }
 117
 118        return 0;
 119err_free:
 120        return ret;
 121}
 122
 123static const struct hid_device_id cp_devices[] = {
 124        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
 125                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 126        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
 127                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 128        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
 129                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 130        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
 131                .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 132        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
 133                .driver_data = CP_2WHEEL_MOUSE_HACK },
 134        { }
 135};
 136MODULE_DEVICE_TABLE(hid, cp_devices);
 137
 138static struct hid_driver cp_driver = {
 139        .name = "cypress",
 140        .id_table = cp_devices,
 141        .report_fixup = cp_report_fixup,
 142        .input_mapped = cp_input_mapped,
 143        .event = cp_event,
 144        .probe = cp_probe,
 145};
 146module_hid_driver(cp_driver);
 147
 148MODULE_LICENSE("GPL");
 149
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