// SPDX-License-Identifier: GPL-2.0-or-later

  /*
   *  HID driver for some samsung "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) 2008 Jiri Slaby

   *  Copyright (c) 2010 Don Prince <dhprince.devel@yahoo.co.uk>
   *

   *  This driver supports several HID devices:
   *
   *  [0419:0001] Samsung IrDA remote controller (reports as Cypress USB Mouse).
   *	various hid report fixups for different variants.
   *
   *  [0419:0600] Creative Desktop Wireless 6000 keyboard/mouse combo
   *	several key mappings used from the consumer usage page
   *	deviate from the USB HUT 1.12 standard.

   */
  
  /*

   */
  
  #include <linux/device.h>

  #include <linux/usb.h>

  #include <linux/hid.h>
  #include <linux/module.h>
  
  #include "hid-ids.h"
  
  /*

   * There are several variants for 0419:0001:
   *
   * 1. 184 byte report descriptor

   * Vendor specific report #4 has a size of 48 bit,
   * and therefore is not accepted when inspecting the descriptors.
   * As a workaround we reinterpret the report as:
   *   Variable type, count 6, size 8 bit, log. maximum 255
   * The burden to reconstruct the data is moved into user space.

   *
   * 2. 203 byte report descriptor
   * Report #4 has an array field with logical range 0..18 instead of 1..15.
   *
   * 3. 135 byte report descriptor
   * Report #4 has an array field with logical range 0..17 instead of 1..14.

   *
   * 4. 171 byte report descriptor
   * Report #3 has an array field with logical range 0..1 instead of 1..3.

   */

  static inline void samsung_irda_dev_trace(struct hid_device *hdev,

  		unsigned int rsize)
  {

  	hid_info(hdev, "fixing up Samsung IrDA %d byte report descriptor
  ",
  		 rsize);

  }

  static __u8 *samsung_irda_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  		unsigned int *rsize)

  {

  	if (*rsize == 184 && rdesc[175] == 0x25 && rdesc[176] == 0x40 &&

  			rdesc[177] == 0x75 && rdesc[178] == 0x30 &&
  			rdesc[179] == 0x95 && rdesc[180] == 0x01 &&
  			rdesc[182] == 0x40) {

  		samsung_irda_dev_trace(hdev, 184);

  		rdesc[176] = 0xff;
  		rdesc[178] = 0x08;
  		rdesc[180] = 0x06;
  		rdesc[182] = 0x42;

  	} else

  	if (*rsize == 203 && rdesc[192] == 0x15 && rdesc[193] == 0x0 &&

  			rdesc[194] == 0x25 && rdesc[195] == 0x12) {

  		samsung_irda_dev_trace(hdev, 203);

  		rdesc[193] = 0x1;
  		rdesc[195] = 0xf;
  	} else

  	if (*rsize == 135 && rdesc[124] == 0x15 && rdesc[125] == 0x0 &&

  			rdesc[126] == 0x25 && rdesc[127] == 0x11) {

  		samsung_irda_dev_trace(hdev, 135);

  		rdesc[125] = 0x1;
  		rdesc[127] = 0xe;

  	} else

  	if (*rsize == 171 && rdesc[160] == 0x15 && rdesc[161] == 0x0 &&

  			rdesc[162] == 0x25 && rdesc[163] == 0x01) {

  		samsung_irda_dev_trace(hdev, 171);

  		rdesc[161] = 0x1;
  		rdesc[163] = 0x3;

  	}

  	return rdesc;

  }

  #define samsung_kbd_mouse_map_key_clear(c) \
  	hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))
  
  static int samsung_kbd_mouse_input_mapping(struct hid_device *hdev,
  	struct hid_input *hi, struct hid_field *field, struct hid_usage *usage,
  	unsigned long **bit, int *max)
  {
  	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
  	unsigned short ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
  
  	if (1 != ifnum || HID_UP_CONSUMER != (usage->hid & HID_USAGE_PAGE))
  		return 0;
  
  	dbg_hid("samsung wireless keyboard/mouse input mapping event [0x%x]
  ",
  		usage->hid & HID_USAGE);
  
  	switch (usage->hid & HID_USAGE) {
  	/* report 2 */

  	case 0x183: samsung_kbd_mouse_map_key_clear(KEY_MEDIA); break;
  	case 0x195: samsung_kbd_mouse_map_key_clear(KEY_EMAIL);	break;
  	case 0x196: samsung_kbd_mouse_map_key_clear(KEY_CALC); break;
  	case 0x197: samsung_kbd_mouse_map_key_clear(KEY_COMPUTER); break;
  	case 0x22b: samsung_kbd_mouse_map_key_clear(KEY_SEARCH); break;
  	case 0x22c: samsung_kbd_mouse_map_key_clear(KEY_WWW); break;
  	case 0x22d: samsung_kbd_mouse_map_key_clear(KEY_BACK); break;
  	case 0x22e: samsung_kbd_mouse_map_key_clear(KEY_FORWARD); break;
  	case 0x22f: samsung_kbd_mouse_map_key_clear(KEY_FAVORITES); break;
  	case 0x230: samsung_kbd_mouse_map_key_clear(KEY_REFRESH); break;
  	case 0x231: samsung_kbd_mouse_map_key_clear(KEY_STOP); break;
  	default:
  		return 0;
  	}
  
  	return 1;
  }

  static __u8 *samsung_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  	unsigned int *rsize)

  {
  	if (USB_DEVICE_ID_SAMSUNG_IR_REMOTE == hdev->product)

  		rdesc = samsung_irda_report_fixup(hdev, rdesc, rsize);
  	return rdesc;

  }
  
  static int samsung_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  	struct hid_field *field, struct hid_usage *usage,
  	unsigned long **bit, int *max)
  {
  	int ret = 0;
  
  	if (USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD_MOUSE == hdev->product)
  		ret = samsung_kbd_mouse_input_mapping(hdev,
  			hi, field, usage, bit, max);
  
  	return ret;
  }

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

  	unsigned int cmask = HID_CONNECT_DEFAULT;

  	ret = hid_parse(hdev);
  	if (ret) {

  		hid_err(hdev, "parse failed
  ");

  		goto err_free;
  	}

  	if (USB_DEVICE_ID_SAMSUNG_IR_REMOTE == hdev->product) {
  		if (hdev->rsize == 184) {
  			/* disable hidinput, force hiddev */
  			cmask = (cmask & ~HID_CONNECT_HIDINPUT) |
  				HID_CONNECT_HIDDEV_FORCE;
  		}

  	}
  
  	ret = hid_hw_start(hdev, cmask);

  	if (ret) {

  		hid_err(hdev, "hw start failed
  ");

  		goto err_free;
  	}
  
  	return 0;
  err_free:
  	return ret;
  }
  
  static const struct hid_device_id samsung_devices[] = {
  	{ HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_IR_REMOTE) },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_SAMSUNG, USB_DEVICE_ID_SAMSUNG_WIRELESS_KBD_MOUSE) },

  	{ }
  };
  MODULE_DEVICE_TABLE(hid, samsung_devices);
  
  static struct hid_driver samsung_driver = {
  	.name = "samsung",
  	.id_table = samsung_devices,
  	.report_fixup = samsung_report_fixup,

  	.input_mapping = samsung_input_mapping,

  	.probe = samsung_probe,
  };

  module_hid_driver(samsung_driver);

  MODULE_LICENSE("GPL");