root/drivers/hid/hid-chicony.c

DEFINITIONS

1. ch_input_mapping
2. ch_switch12_report_fixup

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  HID driver for some chicony "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) 2007 Paul Walmsley
  10  *  Copyright (c) 2008 Jiri Slaby
  11  */
  12 
  13 /*
  14  */
  15 
  16 #include <linux/device.h>
  17 #include <linux/input.h>
  18 #include <linux/hid.h>
  19 #include <linux/module.h>
  20 #include <linux/usb.h>
  21 
  22 #include "hid-ids.h"
  23 
  24 #define ch_map_key_clear(c)     hid_map_usage_clear(hi, usage, bit, max, \
  25                                         EV_KEY, (c))
  26 static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  27                 struct hid_field *field, struct hid_usage *usage,
  28                 unsigned long **bit, int *max)
  29 {
  30         if ((usage->hid & HID_USAGE_PAGE) != HID_UP_MSVENDOR)
  31                 return 0;
  32 
  33         set_bit(EV_REP, hi->input->evbit);
  34         switch (usage->hid & HID_USAGE) {
  35         case 0xff01: ch_map_key_clear(BTN_1);   break;
  36         case 0xff02: ch_map_key_clear(BTN_2);   break;
  37         case 0xff03: ch_map_key_clear(BTN_3);   break;
  38         case 0xff04: ch_map_key_clear(BTN_4);   break;
  39         case 0xff05: ch_map_key_clear(BTN_5);   break;
  40         case 0xff06: ch_map_key_clear(BTN_6);   break;
  41         case 0xff07: ch_map_key_clear(BTN_7);   break;
  42         case 0xff08: ch_map_key_clear(BTN_8);   break;
  43         case 0xff09: ch_map_key_clear(BTN_9);   break;
  44         case 0xff0a: ch_map_key_clear(BTN_A);   break;
  45         case 0xff0b: ch_map_key_clear(BTN_B);   break;
  46         case 0x00f1: ch_map_key_clear(KEY_WLAN);        break;
  47         case 0x00f2: ch_map_key_clear(KEY_BRIGHTNESSDOWN);      break;
  48         case 0x00f3: ch_map_key_clear(KEY_BRIGHTNESSUP);        break;
  49         case 0x00f4: ch_map_key_clear(KEY_DISPLAY_OFF); break;
  50         case 0x00f7: ch_map_key_clear(KEY_CAMERA);      break;
  51         case 0x00f8: ch_map_key_clear(KEY_PROG1);       break;
  52         default:
  53                 return 0;
  54         }
  55         return 1;
  56 }
  57 
  58 static __u8 *ch_switch12_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  59                 unsigned int *rsize)
  60 {
  61         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
  62         
  63         if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
  64                 /* Change usage maximum and logical maximum from 0x7fff to
  65                  * 0x2fff, so they don't exceed HID_MAX_USAGES */
  66                 switch (hdev->product) {
  67                 case USB_DEVICE_ID_CHICONY_ACER_SWITCH12:
  68                         if (*rsize >= 128 && rdesc[64] == 0xff && rdesc[65] == 0x7f
  69                                         && rdesc[69] == 0xff && rdesc[70] == 0x7f) {
  70                                 hid_info(hdev, "Fixing up report descriptor\n");
  71                                 rdesc[65] = rdesc[70] = 0x2f;
  72                         }
  73                         break;
  74                 }
  75 
  76         }
  77         return rdesc;
  78 }
  79 
  80 
  81 static const struct hid_device_id ch_devices[] = {
  82         { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_TACTICAL_PAD) },
  83         { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS2) },
  84         { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_ACER_SWITCH12) },
  85         { }
  86 };
  87 MODULE_DEVICE_TABLE(hid, ch_devices);
  88 
  89 static struct hid_driver ch_driver = {
  90         .name = "chicony",
  91         .id_table = ch_devices,
  92         .report_fixup = ch_switch12_report_fixup,
  93         .input_mapping = ch_input_mapping,
  94 };
  95 module_hid_driver(ch_driver);
  96 
  97 MODULE_LICENSE("GPL");