Quelle  hid-chicony.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  HID driver for some chicony "special" devices
 *
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
 *  Copyright (c) 2006-2007 Jiri Kosina
 *  Copyright (c) 2007 Paul Walmsley
 *  Copyright (c) 2008 Jiri Slaby
 */

/*
 */

#include <linux/device.h>
#include <linux/input.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/usb.h>

#include "hid-ids.h"

#define CH_WIRELESS_CTL_REPORT_ID 0x11

static int ch_report_wireless(struct hid_report *report, u8 *data, int size)
{
 struct hid_device *hdev = report->device;
 struct input_dev *input;

 if (report->id != CH_WIRELESS_CTL_REPORT_ID || report->maxfield != 1)
  return 0;

 input = report->field[0]->hidinput->input;
 if (!input) {
  hid_warn(hdev, "can't find wireless radio control's input");
  return 0;
 }

 input_report_key(input, KEY_RFKILL, 1);
 input_sync(input);
 input_report_key(input, KEY_RFKILL, 0);
 input_sync(input);

 return 1;
}

static int ch_raw_event(struct hid_device *hdev,
  struct hid_report *report, u8 *data, int size)
{
 if (report->application == HID_GD_WIRELESS_RADIO_CTLS)
  return ch_report_wireless(report, data, size);

 return 0;
}

#define ch_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
     EV_KEY, (c))
static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  struct hid_field *field, struct hid_usage *usage,
  unsigned long **bit, int *max)
{
 if ((usage->hid & HID_USAGE_PAGE) != HID_UP_MSVENDOR)
  return 0;

 set_bit(EV_REP, hi->input->evbit);
 switch (usage->hid & HID_USAGE) {
 case 0xff01: ch_map_key_clear(BTN_1); break;
 case 0xff02: ch_map_key_clear(BTN_2); break;
 case 0xff03: ch_map_key_clear(BTN_3); break;
 case 0xff04: ch_map_key_clear(BTN_4); break;
 case 0xff05: ch_map_key_clear(BTN_5); break;
 case 0xff06: ch_map_key_clear(BTN_6); break;
 case 0xff07: ch_map_key_clear(BTN_7); break;
 case 0xff08: ch_map_key_clear(BTN_8); break;
 case 0xff09: ch_map_key_clear(BTN_9); break;
 case 0xff0a: ch_map_key_clear(BTN_A); break;
 case 0xff0b: ch_map_key_clear(BTN_B); break;
 case 0x00f1: ch_map_key_clear(KEY_WLAN); break;
 case 0x00f2: ch_map_key_clear(KEY_BRIGHTNESSDOWN); break;
 case 0x00f3: ch_map_key_clear(KEY_BRIGHTNESSUP); break;
 case 0x00f4: ch_map_key_clear(KEY_DISPLAY_OFF); break;
 case 0x00f7: ch_map_key_clear(KEY_CAMERA); break;
 case 0x00f8: ch_map_key_clear(KEY_PROG1); break;
 default:
  return 0;
 }
 return 1;
}

static const __u8 *ch_switch12_report_fixup(struct hid_device *hdev,
  __u8 *rdesc, unsigned int *rsize)
{
 struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 
 if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
  /* Change usage maximum and logical maximum from 0x7fff to
 * 0x2fff, so they don't exceed HID_MAX_USAGES */
  switch (hdev->product) {
  case USB_DEVICE_ID_CHICONY_ACER_SWITCH12:
   if (*rsize >= 128 && rdesc[64] == 0xff && rdesc[65] == 0x7f
     && rdesc[69] == 0xff && rdesc[70] == 0x7f) {
    hid_info(hdev, "Fixing up report descriptor\n");
    rdesc[65] = rdesc[70] = 0x2f;
   }
   break;
  }

 }
 return rdesc;
}

static int ch_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
 int ret;

 if (!hid_is_usb(hdev))
  return -EINVAL;

 hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
 ret = hid_parse(hdev);
 if (ret) {
  hid_err(hdev, "Chicony hid parse failed: %d\n", ret);
  return ret;
 }

 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 if (ret) {
  hid_err(hdev, "Chicony hw start failed: %d\n", ret);
  return ret;
 }

 return 0;
}

static const struct hid_device_id ch_devices[] = {
 { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_TACTICAL_PAD) },
 { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS2) },
 { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS3) },
 { HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_ACER_SWITCH12) },
 { }
};
MODULE_DEVICE_TABLE(hid, ch_devices);

static struct hid_driver ch_driver = {
 .name = "chicony",
 .id_table = ch_devices,
 .report_fixup = ch_switch12_report_fixup,
 .input_mapping = ch_input_mapping,
 .probe = ch_probe,
 .raw_event = ch_raw_event,
};
module_hid_driver(ch_driver);

MODULE_DESCRIPTION("HID driver for some chicony \"special\" devices");
MODULE_LICENSE("GPL");