drivers/media/usb/dvb-usb/dvb-usb-remote.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /* dvb-usb-remote.c is part of the DVB USB library.
  *
  * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)
  * see dvb-usb-init.c for copyright information.
  *
  * This file contains functions for initializing the input-device and for handling remote-control-queries.
  */
 #include "dvb-usb-common.h"
 #include <linux/usb/input.h>

 static unsigned int
 legacy_dvb_usb_get_keymap_index(const struct input_keymap_entry *ke,
 				struct rc_map_table *keymap,
 				unsigned int keymap_size)
 {
 	unsigned int index;
 	unsigned int scancode;

 	if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
 		index = ke->index;
 	} else {
 		if (input_scancode_to_scalar(ke, &scancode))
 			return keymap_size;

 		/* See if we can match the raw key code. */
 		for (index = 0; index < keymap_size; index++)
 			if (keymap[index].scancode == scancode)
 				break;

 		/* See if there is an unused hole in the map */
 		if (index >= keymap_size) {
 			for (index = 0; index < keymap_size; index++) {
 				if (keymap[index].keycode == KEY_RESERVED ||
 				    keymap[index].keycode == KEY_UNKNOWN) {
 					break;
 				}
 			}
 		}
 	}

 	return index;
 }

 static int legacy_dvb_usb_getkeycode(struct input_dev *dev,
 				     struct input_keymap_entry *ke)
 {
 	struct dvb_usb_device *d = input_get_drvdata(dev);
 	struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
 	unsigned int keymap_size = d->props.rc.legacy.rc_map_size;
 	unsigned int index;

 	index = legacy_dvb_usb_get_keymap_index(ke, keymap, keymap_size);
 	if (index >= keymap_size)
 		return -EINVAL;

 	ke->keycode = keymap[index].keycode;
 	if (ke->keycode == KEY_UNKNOWN)
 		ke->keycode = KEY_RESERVED;
 	ke->len = sizeof(keymap[index].scancode);
 	memcpy(&ke->scancode, &keymap[index].scancode, ke->len);
 	ke->index = index;

 	return 0;
 }

 static int legacy_dvb_usb_setkeycode(struct input_dev *dev,
 				     const struct input_keymap_entry *ke,
 				     unsigned int *old_keycode)
 {
 	struct dvb_usb_device *d = input_get_drvdata(dev);
 	struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
 	unsigned int keymap_size = d->props.rc.legacy.rc_map_size;
 	unsigned int index;

 	index = legacy_dvb_usb_get_keymap_index(ke, keymap, keymap_size);
 	/*
 	 * FIXME: Currently, it is not possible to increase the size of
 	 * scancode table. For it to happen, one possibility
 	 * would be to allocate a table with key_map_size + 1,
 	 * copying data, appending the new key on it, and freeing
 	 * the old one - or maybe just allocating some spare space
 	 */
 	if (index >= keymap_size)
 		return -EINVAL;

 	*old_keycode = keymap[index].keycode;
 	keymap->keycode = ke->keycode;
 	__set_bit(ke->keycode, dev->keybit);

 	if (*old_keycode != KEY_RESERVED) {
 		__clear_bit(*old_keycode, dev->keybit);
 		for (index = 0; index < keymap_size; index++) {
 			if (keymap[index].keycode == *old_keycode) {
 				__set_bit(*old_keycode, dev->keybit);
 				break;
 			}
 		}
 	}

 	return 0;
 }

 /* Remote-control poll function - called every dib->rc_query_interval ms to see
  * whether the remote control has received anything.
  *
  * TODO: Fix the repeat rate of the input device.
  */
 static void legacy_dvb_usb_read_remote_control(struct work_struct *work)
 {
 	struct dvb_usb_device *d =
 		container_of(work, struct dvb_usb_device, rc_query_work.work);
 	u32 event;
 	int state;

 	/* TODO: need a lock here.  We can simply skip checking for the remote control
 	   if we're busy. */

 	/* when the parameter has been set to 1 via sysfs while the driver was running */
 	if (dvb_usb_disable_rc_polling)
 		return;

 	if (d->props.rc.legacy.rc_query(d,&event,&state)) {
 		err("error while querying for an remote control event.");
 		goto schedule;
 	}


 	switch (state) {
 		case REMOTE_NO_KEY_PRESSED:
 			break;
 		case REMOTE_KEY_PRESSED:
 			deb_rc("key pressed\n");
 			d->last_event = event;
 			input_event(d->input_dev, EV_KEY, event, 1);
 			input_sync(d->input_dev);
 			input_event(d->input_dev, EV_KEY, d->last_event, 0);
 			input_sync(d->input_dev);
 			break;
 		case REMOTE_KEY_REPEAT:
 			deb_rc("key repeated\n");
 			input_event(d->input_dev, EV_KEY, event, 1);
 			input_sync(d->input_dev);
 			input_event(d->input_dev, EV_KEY, d->last_event, 0);
 			input_sync(d->input_dev);
 			break;
 		default:
 			break;
 	}

 /* improved repeat handling ???
 	switch (state) {
 		case REMOTE_NO_KEY_PRESSED:
 			deb_rc("NO KEY PRESSED\n");
 			if (d->last_state != REMOTE_NO_KEY_PRESSED) {
 				deb_rc("releasing event %d\n",d->last_event);
 				input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
 				input_sync(d->rc_input_dev);
 			}
 			d->last_state = REMOTE_NO_KEY_PRESSED;
 			d->last_event = 0;
 			break;
 		case REMOTE_KEY_PRESSED:
 			deb_rc("KEY PRESSED\n");
 			deb_rc("pressing event %d\n",event);

 			input_event(d->rc_input_dev, EV_KEY, event, 1);
 			input_sync(d->rc_input_dev);

 			d->last_event = event;
 			d->last_state = REMOTE_KEY_PRESSED;
 			break;
 		case REMOTE_KEY_REPEAT:
 			deb_rc("KEY_REPEAT\n");
 			if (d->last_state != REMOTE_NO_KEY_PRESSED) {
 				deb_rc("repeating event %d\n",d->last_event);
 				input_event(d->rc_input_dev, EV_KEY, d->last_event, 2);
 				input_sync(d->rc_input_dev);
 				d->last_state = REMOTE_KEY_REPEAT;
 			}
 		default:
 			break;
 	}
 */

 schedule:
 	schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc.legacy.rc_interval));
 }

 static int legacy_dvb_usb_remote_init(struct dvb_usb_device *d)
 {
 	int i, err, rc_interval;
 	struct input_dev *input_dev;

 	input_dev = input_allocate_device();
 	if (!input_dev)
 		return -ENOMEM;

 	input_dev->evbit[0] = BIT_MASK(EV_KEY);
 	input_dev->name = "IR-receiver inside an USB DVB receiver";
 	input_dev->phys = d->rc_phys;
 	usb_to_input_id(d->udev, &input_dev->id);
 	input_dev->dev.parent = &d->udev->dev;
 	d->input_dev = input_dev;
 	d->rc_dev = NULL;

 	input_dev->getkeycode = legacy_dvb_usb_getkeycode;
 	input_dev->setkeycode = legacy_dvb_usb_setkeycode;

 	/* set the bits for the keys */
 	deb_rc("key map size: %d\n", d->props.rc.legacy.rc_map_size);
 	for (i = 0; i < d->props.rc.legacy.rc_map_size; i++) {
 		deb_rc("setting bit for event %d item %d\n",
 			d->props.rc.legacy.rc_map_table[i].keycode, i);
 		set_bit(d->props.rc.legacy.rc_map_table[i].keycode, input_dev->keybit);
 	}

 	/* setting these two values to non-zero, we have to manage key repeats */
 	input_dev->rep[REP_PERIOD] = d->props.rc.legacy.rc_interval;
 	input_dev->rep[REP_DELAY]  = d->props.rc.legacy.rc_interval + 150;

 	input_set_drvdata(input_dev, d);

 	err = input_register_device(input_dev);
 	if (err)
 		input_free_device(input_dev);

 	rc_interval = d->props.rc.legacy.rc_interval;

 	INIT_DELAYED_WORK(&d->rc_query_work, legacy_dvb_usb_read_remote_control);

 	info("schedule remote query interval to %d msecs.", rc_interval);
 	schedule_delayed_work(&d->rc_query_work,
 			      msecs_to_jiffies(rc_interval));

 	d->state |= DVB_USB_STATE_REMOTE;

 	return err;
 }

 /* Remote-control poll function - called every dib->rc_query_interval ms to see
  * whether the remote control has received anything.
  *
  * TODO: Fix the repeat rate of the input device.
  */
 static void dvb_usb_read_remote_control(struct work_struct *work)
 {
 	struct dvb_usb_device *d =
 		container_of(work, struct dvb_usb_device, rc_query_work.work);
 	int err;

 	/* TODO: need a lock here.  We can simply skip checking for the remote control
 	   if we're busy. */

 	/* when the parameter has been set to 1 via sysfs while the
 	 * driver was running, or when bulk mode is enabled after IR init
 	 */
 	if (dvb_usb_disable_rc_polling || d->props.rc.core.bulk_mode)
 		return;

 	err = d->props.rc.core.rc_query(d);
 	if (err)
 		err("error %d while querying for an remote control event.", err);

 	schedule_delayed_work(&d->rc_query_work,
 			      msecs_to_jiffies(d->props.rc.core.rc_interval));
 }

 static int rc_core_dvb_usb_remote_init(struct dvb_usb_device *d)
 {
 	int err, rc_interval;
 	struct rc_dev *dev;

 	dev = rc_allocate_device(d->props.rc.core.driver_type);
 	if (!dev)
 		return -ENOMEM;

 	dev->driver_name = d->props.rc.core.module_name;
 	dev->map_name = d->props.rc.core.rc_codes;
 	dev->change_protocol = d->props.rc.core.change_protocol;
 	dev->allowed_protocols = d->props.rc.core.allowed_protos;
 	usb_to_input_id(d->udev, &dev->input_id);
 	dev->device_name = d->desc->name;
 	dev->input_phys = d->rc_phys;
 	dev->dev.parent = &d->udev->dev;
 	dev->priv = d;
 	dev->scancode_mask = d->props.rc.core.scancode_mask;

 	err = rc_register_device(dev);
 	if (err < 0) {
 		rc_free_device(dev);
 		return err;
 	}

 	d->input_dev = NULL;
 	d->rc_dev = dev;

 	if (!d->props.rc.core.rc_query || d->props.rc.core.bulk_mode)
 		return 0;

 	/* Polling mode - initialize a work queue for handling it */
 	INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control);

 	rc_interval = d->props.rc.core.rc_interval;

 	info("schedule remote query interval to %d msecs.", rc_interval);
 	schedule_delayed_work(&d->rc_query_work,
 			      msecs_to_jiffies(rc_interval));

 	return 0;
 }

 int dvb_usb_remote_init(struct dvb_usb_device *d)
 {
 	int err;

 	if (dvb_usb_disable_rc_polling)
 		return 0;

 	if (d->props.rc.legacy.rc_map_table && d->props.rc.legacy.rc_query)
 		d->props.rc.mode = DVB_RC_LEGACY;
 	else if (d->props.rc.core.rc_codes)
 		d->props.rc.mode = DVB_RC_CORE;
 	else
 		return 0;

 	usb_make_path(d->udev, d->rc_phys, sizeof(d->rc_phys));
 	strlcat(d->rc_phys, "/ir0", sizeof(d->rc_phys));

 	/* Start the remote-control polling. */
 	if (d->props.rc.legacy.rc_interval < 40)
 		d->props.rc.legacy.rc_interval = 100; /* default */

 	if (d->props.rc.mode == DVB_RC_LEGACY)
 		err = legacy_dvb_usb_remote_init(d);
 	else
 		err = rc_core_dvb_usb_remote_init(d);
 	if (err)
 		return err;

 	d->state |= DVB_USB_STATE_REMOTE;

 	return 0;
 }

 int dvb_usb_remote_exit(struct dvb_usb_device *d)
 {
 	if (d->state & DVB_USB_STATE_REMOTE) {
 		cancel_delayed_work_sync(&d->rc_query_work);
 		if (d->props.rc.mode == DVB_RC_LEGACY)
 			input_unregister_device(d->input_dev);
 		else
 			rc_unregister_device(d->rc_dev);
 	}
 	d->state &= ~DVB_USB_STATE_REMOTE;
 	return 0;
 }

 #define DVB_USB_RC_NEC_EMPTY           0x00
 #define DVB_USB_RC_NEC_KEY_PRESSED     0x01
 #define DVB_USB_RC_NEC_KEY_REPEATED    0x02
 int dvb_usb_nec_rc_key_to_event(struct dvb_usb_device *d,
 		u8 keybuf[5], u32 *event, int *state)
 {
 	int i;
 	struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
 	*event = 0;
 	*state = REMOTE_NO_KEY_PRESSED;
 	switch (keybuf[0]) {
 		case DVB_USB_RC_NEC_EMPTY:
 			break;
 		case DVB_USB_RC_NEC_KEY_PRESSED:
 			if ((u8) ~keybuf[1] != keybuf[2] ||
 				(u8) ~keybuf[3] != keybuf[4]) {
 				deb_err("remote control checksum failed.\n");
 				break;
 			}
 			/* See if we can match the raw key code. */
 			for (i = 0; i < d->props.rc.legacy.rc_map_size; i++)
 				if (rc5_custom(&keymap[i]) == keybuf[1] &&
 					rc5_data(&keymap[i]) == keybuf[3]) {
 					*event = keymap[i].keycode;
 					*state = REMOTE_KEY_PRESSED;
 					return 0;
 				}
 			deb_err("key mapping failed - no appropriate key found in keymapping\n");
 			break;
 		case DVB_USB_RC_NEC_KEY_REPEATED:
 			*state = REMOTE_KEY_REPEAT;
 			break;
 		default:
 			deb_err("unknown type of remote status: %d\n",keybuf[0]);
 			break;
 	}
 	return 0;
 }
 EXPORT_SYMBOL(dvb_usb_nec_rc_key_to_event);
	// SPDX-License-Identifier: GPL-2.0
	/* dvb-usb-remote.c is part of the DVB USB library.
	*
	* Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)
	* see dvb-usb-init.c for copyright information.
	*
	* This file contains functions for initializing the input-device and for handling remote-control-queries.
	*/
	#include "dvb-usb-common.h"
	#include <linux/usb/input.h>

	static unsigned int
	legacy_dvb_usb_get_keymap_index(const struct input_keymap_entry *ke,
	struct rc_map_table *keymap,
	unsigned int keymap_size)
	{
	unsigned int index;
	unsigned int scancode;

	if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
	index = ke->index;
	} else {
	if (input_scancode_to_scalar(ke, &scancode))
	return keymap_size;

	/* See if we can match the raw key code. */
	for (index = 0; index < keymap_size; index++)
	if (keymap[index].scancode == scancode)
	break;

	/* See if there is an unused hole in the map */
	if (index >= keymap_size) {
	for (index = 0; index < keymap_size; index++) {
	if (keymap[index].keycode == KEY_RESERVED \|\|
	keymap[index].keycode == KEY_UNKNOWN) {
	break;
	}
	}
	}
	}

	return index;
	}

	static int legacy_dvb_usb_getkeycode(struct input_dev *dev,
	struct input_keymap_entry *ke)
	{
	struct dvb_usb_device *d = input_get_drvdata(dev);
	struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
	unsigned int keymap_size = d->props.rc.legacy.rc_map_size;
	unsigned int index;

	index = legacy_dvb_usb_get_keymap_index(ke, keymap, keymap_size);
	if (index >= keymap_size)
	return -EINVAL;

	ke->keycode = keymap[index].keycode;
	if (ke->keycode == KEY_UNKNOWN)
	ke->keycode = KEY_RESERVED;
	ke->len = sizeof(keymap[index].scancode);
	memcpy(&ke->scancode, &keymap[index].scancode, ke->len);
	ke->index = index;

	return 0;
	}

	static int legacy_dvb_usb_setkeycode(struct input_dev *dev,
	const struct input_keymap_entry *ke,
	unsigned int *old_keycode)
	{
	struct dvb_usb_device *d = input_get_drvdata(dev);
	struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
	unsigned int keymap_size = d->props.rc.legacy.rc_map_size;
	unsigned int index;

	index = legacy_dvb_usb_get_keymap_index(ke, keymap, keymap_size);
	/*
	* FIXME: Currently, it is not possible to increase the size of
	* scancode table. For it to happen, one possibility
	* would be to allocate a table with key_map_size + 1,
	* copying data, appending the new key on it, and freeing
	* the old one - or maybe just allocating some spare space
	*/
	if (index >= keymap_size)
	return -EINVAL;

	*old_keycode = keymap[index].keycode;
	keymap->keycode = ke->keycode;
	__set_bit(ke->keycode, dev->keybit);

	if (*old_keycode != KEY_RESERVED) {
	__clear_bit(*old_keycode, dev->keybit);
	for (index = 0; index < keymap_size; index++) {
	if (keymap[index].keycode == *old_keycode) {
	__set_bit(*old_keycode, dev->keybit);
	break;
	}
	}
	}

	return 0;
	}

	/* Remote-control poll function - called every dib->rc_query_interval ms to see
	* whether the remote control has received anything.
	*
	* TODO: Fix the repeat rate of the input device.
	*/
	static void legacy_dvb_usb_read_remote_control(struct work_struct *work)
	{
	struct dvb_usb_device *d =
	container_of(work, struct dvb_usb_device, rc_query_work.work);
	u32 event;
	int state;

	/* TODO: need a lock here. We can simply skip checking for the remote control
	if we're busy. */

	/* when the parameter has been set to 1 via sysfs while the driver was running */
	if (dvb_usb_disable_rc_polling)
	return;

	if (d->props.rc.legacy.rc_query(d,&event,&state)) {
	err("error while querying for an remote control event.");
	goto schedule;
	}


	switch (state) {
	case REMOTE_NO_KEY_PRESSED:
	break;
	case REMOTE_KEY_PRESSED:
	deb_rc("key pressed\n");
	d->last_event = event;
	input_event(d->input_dev, EV_KEY, event, 1);
	input_sync(d->input_dev);
	input_event(d->input_dev, EV_KEY, d->last_event, 0);
	input_sync(d->input_dev);
	break;
	case REMOTE_KEY_REPEAT:
	deb_rc("key repeated\n");
	input_event(d->input_dev, EV_KEY, event, 1);
	input_sync(d->input_dev);
	input_event(d->input_dev, EV_KEY, d->last_event, 0);
	input_sync(d->input_dev);
	break;
	default:
	break;
	}

	/* improved repeat handling ???
	switch (state) {
	case REMOTE_NO_KEY_PRESSED:
	deb_rc("NO KEY PRESSED\n");
	if (d->last_state != REMOTE_NO_KEY_PRESSED) {
	deb_rc("releasing event %d\n",d->last_event);
	input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
	input_sync(d->rc_input_dev);
	}
	d->last_state = REMOTE_NO_KEY_PRESSED;
	d->last_event = 0;
	break;
	case REMOTE_KEY_PRESSED:
	deb_rc("KEY PRESSED\n");
	deb_rc("pressing event %d\n",event);

	input_event(d->rc_input_dev, EV_KEY, event, 1);
	input_sync(d->rc_input_dev);

	d->last_event = event;
	d->last_state = REMOTE_KEY_PRESSED;
	break;
	case REMOTE_KEY_REPEAT:
	deb_rc("KEY_REPEAT\n");
	if (d->last_state != REMOTE_NO_KEY_PRESSED) {
	deb_rc("repeating event %d\n",d->last_event);
	input_event(d->rc_input_dev, EV_KEY, d->last_event, 2);
	input_sync(d->rc_input_dev);
	d->last_state = REMOTE_KEY_REPEAT;
	}
	default:
	break;
	}
	*/

	schedule:
	schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc.legacy.rc_interval));
	}

	static int legacy_dvb_usb_remote_init(struct dvb_usb_device *d)
	{
	int i, err, rc_interval;
	struct input_dev *input_dev;

	input_dev = input_allocate_device();
	if (!input_dev)
	return -ENOMEM;

	input_dev->evbit[0] = BIT_MASK(EV_KEY);
	input_dev->name = "IR-receiver inside an USB DVB receiver";
	input_dev->phys = d->rc_phys;
	usb_to_input_id(d->udev, &input_dev->id);
	input_dev->dev.parent = &d->udev->dev;
	d->input_dev = input_dev;
	d->rc_dev = NULL;

	input_dev->getkeycode = legacy_dvb_usb_getkeycode;
	input_dev->setkeycode = legacy_dvb_usb_setkeycode;

	/* set the bits for the keys */
	deb_rc("key map size: %d\n", d->props.rc.legacy.rc_map_size);
	for (i = 0; i < d->props.rc.legacy.rc_map_size; i++) {
	deb_rc("setting bit for event %d item %d\n",
	d->props.rc.legacy.rc_map_table[i].keycode, i);
	set_bit(d->props.rc.legacy.rc_map_table[i].keycode, input_dev->keybit);
	}

	/* setting these two values to non-zero, we have to manage key repeats */
	input_dev->rep[REP_PERIOD] = d->props.rc.legacy.rc_interval;
	input_dev->rep[REP_DELAY] = d->props.rc.legacy.rc_interval + 150;

	input_set_drvdata(input_dev, d);

	err = input_register_device(input_dev);
	if (err)
	input_free_device(input_dev);

	rc_interval = d->props.rc.legacy.rc_interval;

	INIT_DELAYED_WORK(&d->rc_query_work, legacy_dvb_usb_read_remote_control);

	info("schedule remote query interval to %d msecs.", rc_interval);
	schedule_delayed_work(&d->rc_query_work,
	msecs_to_jiffies(rc_interval));

	d->state \|= DVB_USB_STATE_REMOTE;

	return err;
	}

	/* Remote-control poll function - called every dib->rc_query_interval ms to see
	* whether the remote control has received anything.
	*
	* TODO: Fix the repeat rate of the input device.
	*/
	static void dvb_usb_read_remote_control(struct work_struct *work)
	{
	struct dvb_usb_device *d =
	container_of(work, struct dvb_usb_device, rc_query_work.work);
	int err;

	/* TODO: need a lock here. We can simply skip checking for the remote control
	if we're busy. */

	/* when the parameter has been set to 1 via sysfs while the
	* driver was running, or when bulk mode is enabled after IR init
	*/
	if (dvb_usb_disable_rc_polling \|\| d->props.rc.core.bulk_mode)
	return;

	err = d->props.rc.core.rc_query(d);
	if (err)
	err("error %d while querying for an remote control event.", err);

	schedule_delayed_work(&d->rc_query_work,
	msecs_to_jiffies(d->props.rc.core.rc_interval));
	}

	static int rc_core_dvb_usb_remote_init(struct dvb_usb_device *d)
	{
	int err, rc_interval;
	struct rc_dev *dev;

	dev = rc_allocate_device(d->props.rc.core.driver_type);
	if (!dev)
	return -ENOMEM;

	dev->driver_name = d->props.rc.core.module_name;
	dev->map_name = d->props.rc.core.rc_codes;
	dev->change_protocol = d->props.rc.core.change_protocol;
	dev->allowed_protocols = d->props.rc.core.allowed_protos;
	usb_to_input_id(d->udev, &dev->input_id);
	dev->device_name = d->desc->name;
	dev->input_phys = d->rc_phys;
	dev->dev.parent = &d->udev->dev;
	dev->priv = d;
	dev->scancode_mask = d->props.rc.core.scancode_mask;

	err = rc_register_device(dev);
	if (err < 0) {
	rc_free_device(dev);
	return err;
	}

	d->input_dev = NULL;
	d->rc_dev = dev;

	if (!d->props.rc.core.rc_query \|\| d->props.rc.core.bulk_mode)
	return 0;

	/* Polling mode - initialize a work queue for handling it */
	INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control);

	rc_interval = d->props.rc.core.rc_interval;

	info("schedule remote query interval to %d msecs.", rc_interval);
	schedule_delayed_work(&d->rc_query_work,
	msecs_to_jiffies(rc_interval));

	return 0;
	}

	int dvb_usb_remote_init(struct dvb_usb_device *d)
	{
	int err;

	if (dvb_usb_disable_rc_polling)
	return 0;

	if (d->props.rc.legacy.rc_map_table && d->props.rc.legacy.rc_query)
	d->props.rc.mode = DVB_RC_LEGACY;
	else if (d->props.rc.core.rc_codes)
	d->props.rc.mode = DVB_RC_CORE;
	else
	return 0;

	usb_make_path(d->udev, d->rc_phys, sizeof(d->rc_phys));
	strlcat(d->rc_phys, "/ir0", sizeof(d->rc_phys));

	/* Start the remote-control polling. */
	if (d->props.rc.legacy.rc_interval < 40)
	d->props.rc.legacy.rc_interval = 100; /* default */

	if (d->props.rc.mode == DVB_RC_LEGACY)
	err = legacy_dvb_usb_remote_init(d);
	else
	err = rc_core_dvb_usb_remote_init(d);
	if (err)
	return err;

	d->state \|= DVB_USB_STATE_REMOTE;

	return 0;
	}

	int dvb_usb_remote_exit(struct dvb_usb_device *d)
	{
	if (d->state & DVB_USB_STATE_REMOTE) {
	cancel_delayed_work_sync(&d->rc_query_work);
	if (d->props.rc.mode == DVB_RC_LEGACY)
	input_unregister_device(d->input_dev);
	else
	rc_unregister_device(d->rc_dev);
	}
	d->state &= ~DVB_USB_STATE_REMOTE;
	return 0;
	}

	#define DVB_USB_RC_NEC_EMPTY 0x00
	#define DVB_USB_RC_NEC_KEY_PRESSED 0x01
	#define DVB_USB_RC_NEC_KEY_REPEATED 0x02
	int dvb_usb_nec_rc_key_to_event(struct dvb_usb_device *d,
	u8 keybuf[5], u32 event, int state)
	{
	int i;
	struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
	*event = 0;
	*state = REMOTE_NO_KEY_PRESSED;
	switch (keybuf[0]) {
	case DVB_USB_RC_NEC_EMPTY:
	break;
	case DVB_USB_RC_NEC_KEY_PRESSED:
	if ((u8) ~keybuf[1] != keybuf[2] \|\|
	(u8) ~keybuf[3] != keybuf[4]) {
	deb_err("remote control checksum failed.\n");
	break;
	}
	/* See if we can match the raw key code. */
	for (i = 0; i < d->props.rc.legacy.rc_map_size; i++)
	if (rc5_custom(&keymap[i]) == keybuf[1] &&
	rc5_data(&keymap[i]) == keybuf[3]) {
	*event = keymap[i].keycode;
	*state = REMOTE_KEY_PRESSED;
	return 0;
	}
	deb_err("key mapping failed - no appropriate key found in keymapping\n");
	break;
	case DVB_USB_RC_NEC_KEY_REPEATED:
	*state = REMOTE_KEY_REPEAT;
	break;
	default:
	deb_err("unknown type of remote status: %d\n",keybuf[0]);
	break;
	}
	return 0;
	}
	EXPORT_SYMBOL(dvb_usb_nec_rc_key_to_event);