kernel/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) 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  */
  33 static __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
  54 static 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
  71 static 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
  99 static 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;
 119 err_free:
 120         return ret;
 121 }
 122
 123 static 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 };
 136 MODULE_DEVICE_TABLE(hid, cp_devices);
 137
 138 static 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 };
 146 module_hid_driver(cp_driver);
 147
 148 MODULE_LICENSE("GPL");