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 void 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;
  42
  43         for (i = 0; i < rsize - 4; i++)
  44                 if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
  45                         __u8 tmp;
  46
  47                         rdesc[i] = 0x19;
  48                         rdesc[i + 2] = 0x29;
  49                         tmp = rdesc[i + 3];
  50                         rdesc[i + 3] = rdesc[i + 1];
  51                         rdesc[i + 1] = tmp;
  52                 }
  53 }
  54
  55 static 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
  72 static 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
 100 static 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                 dev_err(&hdev->dev, "parse failed\n");
 110                 goto err_free;
 111         }
 112
 113         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 114         if (ret) {
 115                 dev_err(&hdev->dev, "hw start failed\n");
 116                 goto err_free;
 117         }
 118
 119         return 0;
 120 err_free:
 121         return ret;
 122 }
 123
 124 static 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_MOUSE),
 132                 .driver_data = CP_2WHEEL_MOUSE_HACK },
 133         { }
 134 };
 135 MODULE_DEVICE_TABLE(hid, cp_devices);
 136
 137 static struct hid_driver cp_driver = {
 138         .name = "cypress",
 139         .id_table = cp_devices,
 140         .report_fixup = cp_report_fixup,
 141         .input_mapped = cp_input_mapped,
 142         .event = cp_event,
 143         .probe = cp_probe,
 144 };
 145
 146 static int __init cp_init(void)
 147 {
 148         return hid_register_driver(&cp_driver);
 149 }
 150
 151 static void __exit cp_exit(void)
 152 {
 153         hid_unregister_driver(&cp_driver);
 154 }
 155
 156 module_init(cp_init);
 157 module_exit(cp_exit);
 158 MODULE_LICENSE("GPL");