// SPDX-License-Identifier: GPL-2.0-only

  /***************************************************************************
   *   Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org>  *
   *                                                                         *
   *   Based on Logitech G13 driver (v0.4)                                   *
   *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu>   *
   *                                                                         *

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

  
  #include <linux/fb.h>
  #include <linux/vmalloc.h>
  #include <linux/backlight.h>
  #include <linux/lcd.h>
  
  #include <linux/leds.h>
  
  #include <linux/seq_file.h>
  #include <linux/debugfs.h>
  
  #include <linux/completion.h>
  #include <linux/uaccess.h>
  #include <linux/module.h>

  #include <media/rc-core.h>

  
  #include "hid-picolcd.h"
  
  
  int picolcd_raw_cir(struct picolcd_data *data,
  		struct hid_report *report, u8 *raw_data, int size)
  {

  	unsigned long flags;
  	int i, w, sz;

  	struct ir_raw_event rawir = {};

  
  	/* ignore if rc_dev is NULL or status is shunned */
  	spin_lock_irqsave(&data->lock, flags);

  	if (!data->rc_dev || (data->status & PICOLCD_CIR_SHUN)) {

  		spin_unlock_irqrestore(&data->lock, flags);
  		return 1;
  	}
  	spin_unlock_irqrestore(&data->lock, flags);
  
  	/* PicoLCD USB packets contain 16-bit intervals in network order,
  	 * with value negated for pulse. Intervals are in microseconds.
  	 *
  	 * Note: some userspace LIRC code for PicoLCD says negated values
  	 * for space - is it a matter of IR chip? (pulse for my TSOP2236)
  	 *
  	 * In addition, the first interval seems to be around 15000 + base
  	 * interval for non-first report of IR data - thus the quirk below
  	 * to get RC_CODE to understand Sony and JVC remotes I have at hand
  	 */
  	sz = size > 0 ? min((int)raw_data[0], size-1) : 0;
  	for (i = 0; i+1 < sz; i += 2) {

  		w = (raw_data[i] << 8) | (raw_data[i+1]);
  		rawir.pulse = !!(w & 0x8000);

  		rawir.duration = rawir.pulse ? (65536 - w) : w;

  		/* Quirk!! - see above */

  		if (i == 0 && rawir.duration > 15000)
  			rawir.duration -= 15000;

  		ir_raw_event_store(data->rc_dev, &rawir);
  	}
  	ir_raw_event_handle(data->rc_dev);

  	return 1;
  }

  static int picolcd_cir_open(struct rc_dev *dev)
  {
  	struct picolcd_data *data = dev->priv;
  	unsigned long flags;
  
  	spin_lock_irqsave(&data->lock, flags);
  	data->status &= ~PICOLCD_CIR_SHUN;
  	spin_unlock_irqrestore(&data->lock, flags);
  	return 0;
  }
  
  static void picolcd_cir_close(struct rc_dev *dev)
  {
  	struct picolcd_data *data = dev->priv;
  	unsigned long flags;
  
  	spin_lock_irqsave(&data->lock, flags);
  	data->status |= PICOLCD_CIR_SHUN;
  	spin_unlock_irqrestore(&data->lock, flags);
  }

  /* initialize CIR input device */
  int picolcd_init_cir(struct picolcd_data *data, struct hid_report *report)
  {

  	struct rc_dev *rdev;
  	int ret = 0;

  	rdev = rc_allocate_device(RC_DRIVER_IR_RAW);

  	if (!rdev)
  		return -ENOMEM;
  
  	rdev->priv             = data;

  	rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;

  	rdev->open             = picolcd_cir_open;
  	rdev->close            = picolcd_cir_close;

  	rdev->device_name      = data->hdev->name;

  	rdev->input_phys       = data->hdev->phys;
  	rdev->input_id.bustype = data->hdev->bus;
  	rdev->input_id.vendor  = data->hdev->vendor;
  	rdev->input_id.product = data->hdev->product;
  	rdev->input_id.version = data->hdev->version;
  	rdev->dev.parent       = &data->hdev->dev;
  	rdev->driver_name      = PICOLCD_NAME;
  	rdev->map_name         = RC_MAP_RC6_MCE;

  	rdev->timeout          = MS_TO_US(100);
  	rdev->rx_resolution    = 1;

  
  	ret = rc_register_device(rdev);
  	if (ret)
  		goto err;
  	data->rc_dev = rdev;

  	return 0;

  
  err:
  	rc_free_device(rdev);
  	return ret;

  }
  
  void picolcd_exit_cir(struct picolcd_data *data)
  {

  	struct rc_dev *rdev = data->rc_dev;
  
  	data->rc_dev = NULL;

  	rc_unregister_device(rdev);

  }