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                        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");
 146
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