drivers/hid/hid-cypress.c

   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  */
  34 static __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         if (*rsize < 4)
  44                 return rdesc;
  45
  46         for (i = 0; i < *rsize - 4; i++)
  47                 if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
  48                         __u8 tmp;
  49
  50                         rdesc[i] = 0x19;
  51                         rdesc[i + 2] = 0x29;
  52                         tmp = rdesc[i + 3];
  53                         rdesc[i + 3] = rdesc[i + 1];
  54                         rdesc[i + 1] = tmp;
  55                 }
  56         return rdesc;
  57 }
  58
  59 static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  60                 struct hid_field *field, struct hid_usage *usage,
  61                 unsigned long **bit, int *max)
  62 {
  63         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  64
  65         if (!(quirks & CP_2WHEEL_MOUSE_HACK))
  66                 return 0;
  67
  68         if (usage->type == EV_REL && usage->code == REL_WHEEL)
  69                 set_bit(REL_HWHEEL, *bit);
  70         if (usage->hid == 0x00090005)
  71                 return -1;
  72
  73         return 0;
  74 }
  75
  76 static int cp_event(struct hid_device *hdev, struct hid_field *field,
  77                 struct hid_usage *usage, __s32 value)
  78 {
  79         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  80
  81         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
  82                         !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
  83                 return 0;
  84
  85         if (usage->hid == 0x00090005) {
  86                 if (value)
  87                         quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
  88                 else
  89                         quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
  90                 hid_set_drvdata(hdev, (void *)quirks);
  91                 return 1;
  92         }
  93
  94         if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
  95                 struct input_dev *input = field->hidinput->input;
  96
  97                 input_event(input, usage->type, REL_HWHEEL, value);
  98                 return 1;
  99         }
 100
 101         return 0;
 102 }
 103
 104 static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 105 {
 106         unsigned long quirks = id->driver_data;
 107         int ret;
 108
 109         hid_set_drvdata(hdev, (void *)quirks);
 110
 111         ret = hid_parse(hdev);
 112         if (ret) {
 113                 hid_err(hdev, "parse failed\n");
 114                 goto err_free;
 115         }
 116
 117         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 118         if (ret) {
 119                 hid_err(hdev, "hw start failed\n");
 120                 goto err_free;
 121         }
 122
 123         return 0;
 124 err_free:
 125         return ret;
 126 }
 127
 128 static const struct hid_device_id cp_devices[] = {
 129         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
 130                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 131         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
 132                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 133         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
 134                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 135         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
 136                 .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
 137         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
 138                 .driver_data = CP_2WHEEL_MOUSE_HACK },
 139         { }
 140 };
 141 MODULE_DEVICE_TABLE(hid, cp_devices);
 142
 143 static struct hid_driver cp_driver = {
 144         .name = "cypress",
 145         .id_table = cp_devices,
 146         .report_fixup = cp_report_fixup,
 147         .input_mapped = cp_input_mapped,
 148         .event = cp_event,
 149         .probe = cp_probe,
 150 };
 151
 152 static int __init cp_init(void)
 153 {
 154         return hid_register_driver(&cp_driver);
 155 }
 156
 157 static void __exit cp_exit(void)
 158 {
 159         hid_unregister_driver(&cp_driver);
 160 }
 161
 162 module_init(cp_init);
 163 module_exit(cp_exit);
 164 MODULE_LICENSE("GPL");