root/drivers/hid/hid-cypress.c

DEFINITIONS

1. cp_report_fixup
2. cp_input_mapped
3. cp_event
4. cp_probe

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  HID driver for some cypress "special" devices
   4  *
   5  *  Copyright (c) 1999 Andreas Gal
   6  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   7  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   8  *  Copyright (c) 2006-2007 Jiri Kosina
   9  *  Copyright (c) 2008 Jiri Slaby
  10  */
  11 
  12 /*
  13  */
  14 
  15 #include <linux/device.h>
  16 #include <linux/hid.h>
  17 #include <linux/input.h>
  18 #include <linux/module.h>
  19 
  20 #include "hid-ids.h"
  21 
  22 #define CP_RDESC_SWAPPED_MIN_MAX        0x01
  23 #define CP_2WHEEL_MOUSE_HACK            0x02
  24 #define CP_2WHEEL_MOUSE_HACK_ON         0x04
  25 
  26 /*
  27  * Some USB barcode readers from cypress have usage min and usage max in
  28  * the wrong order
  29  */
  30 static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  31                 unsigned int *rsize)
  32 {
  33         unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
  34         unsigned int i;
  35 
  36         if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX))
  37                 return rdesc;
  38 
  39         if (*rsize < 4)
  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 
  51 static 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 
  68 static 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 
  96 static 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;
 116 err_free:
 117         return ret;
 118 }
 119 
 120 static 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 };
 133 MODULE_DEVICE_TABLE(hid, cp_devices);
 134 
 135 static 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 };
 143 module_hid_driver(cp_driver);
 144 
 145 MODULE_LICENSE("GPL");