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

 /* dvb-usb-remote.c is part of the DVB USB library.
  *
  * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.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 int dvb_usb_getkeycode(struct input_dev *dev,
 				unsigned int scancode, unsigned int *keycode)
 {
 	struct dvb_usb_device *d = input_get_drvdata(dev);

 	struct dvb_usb_rc_key *keymap = d->props.rc_key_map;
 	int i;

 	/* See if we can match the raw key code. */
 	for (i = 0; i < d->props.rc_key_map_size; i++)
 		if (keymap[i].scan == scancode) {
 			*keycode = keymap[i].event;
 			return 0;
 		}

 	/*
 	 * If is there extra space, returns KEY_RESERVED,
 	 * otherwise, input core won't let dvb_usb_setkeycode
 	 * to work
 	 */
 	for (i = 0; i < d->props.rc_key_map_size; i++)
 		if (keymap[i].event == KEY_RESERVED ||
 		    keymap[i].event == KEY_UNKNOWN) {
 			*keycode = KEY_RESERVED;
 			return 0;
 		}

 	return -EINVAL;
 }

 static int dvb_usb_setkeycode(struct input_dev *dev,
 				unsigned int scancode, unsigned int keycode)
 {
 	struct dvb_usb_device *d = input_get_drvdata(dev);

 	struct dvb_usb_rc_key *keymap = d->props.rc_key_map;
 	int i;

 	/* Search if it is replacing an existing keycode */
 	for (i = 0; i < d->props.rc_key_map_size; i++)
 		if (keymap[i].scan == scancode) {
 			keymap[i].event = keycode;
 			return 0;
 		}

 	/* Search if is there a clean entry. If so, use it */
 	for (i = 0; i < d->props.rc_key_map_size; i++)
 		if (keymap[i].event == KEY_RESERVED ||
 		    keymap[i].event == KEY_UNKNOWN) {
 			keymap[i].scan = scancode;
 			keymap[i].event = keycode;
 			return 0;
 		}

 	/*
 	 * 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
 	 */

 	return -EINVAL;
 }

 /* 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);
 	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_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;
 		case REMOTE_KEY_REPEAT:
 			deb_rc("key repeated\n");
 			input_event(d->rc_input_dev, EV_KEY, event, 1);
 			input_sync(d->rc_input_dev);
 			input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
 			input_sync(d->rc_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_interval));
 }

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

 	if (d->props.rc_key_map == NULL ||
 		d->props.rc_query == NULL ||
 		dvb_usb_disable_rc_polling)
 		return 0;

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

 	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;
 	input_dev->getkeycode = dvb_usb_getkeycode;
 	input_dev->setkeycode = dvb_usb_setkeycode;

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

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

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

 	input_set_drvdata(input_dev, d);

 	err = input_register_device(input_dev);
 	if (err) {
 		input_free_device(input_dev);
 		return err;
 	}

 	d->rc_input_dev = input_dev;

 	INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control);

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

 	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_rearming_delayed_work(&d->rc_query_work);
 		flush_scheduled_work();
 		input_unregister_device(d->rc_input_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 dvb_usb_rc_key *keymap = d->props.rc_key_map;
 	*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_key_map_size; i++)
 				if (rc5_custom(&keymap[i]) == keybuf[1] &&
 					rc5_data(&keymap[i]) == keybuf[3]) {
 					*event = keymap[i].event;
 					*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);
	/* dvb-usb-remote.c is part of the DVB USB library.
	*
	* Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@desy.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 int dvb_usb_getkeycode(struct input_dev *dev,
	unsigned int scancode, unsigned int *keycode)
	{
	struct dvb_usb_device *d = input_get_drvdata(dev);

	struct dvb_usb_rc_key *keymap = d->props.rc_key_map;
	int i;

	/* See if we can match the raw key code. */
	for (i = 0; i < d->props.rc_key_map_size; i++)
	if (keymap[i].scan == scancode) {
	*keycode = keymap[i].event;
	return 0;
	}

	/*
	* If is there extra space, returns KEY_RESERVED,
	* otherwise, input core won't let dvb_usb_setkeycode
	* to work
	*/
	for (i = 0; i < d->props.rc_key_map_size; i++)
	if (keymap[i].event == KEY_RESERVED \|\|
	keymap[i].event == KEY_UNKNOWN) {
	*keycode = KEY_RESERVED;
	return 0;
	}

	return -EINVAL;
	}

	static int dvb_usb_setkeycode(struct input_dev *dev,
	unsigned int scancode, unsigned int keycode)
	{
	struct dvb_usb_device *d = input_get_drvdata(dev);

	struct dvb_usb_rc_key *keymap = d->props.rc_key_map;
	int i;

	/* Search if it is replacing an existing keycode */
	for (i = 0; i < d->props.rc_key_map_size; i++)
	if (keymap[i].scan == scancode) {
	keymap[i].event = keycode;
	return 0;
	}

	/* Search if is there a clean entry. If so, use it */
	for (i = 0; i < d->props.rc_key_map_size; i++)
	if (keymap[i].event == KEY_RESERVED \|\|
	keymap[i].event == KEY_UNKNOWN) {
	keymap[i].scan = scancode;
	keymap[i].event = keycode;
	return 0;
	}

	/*
	* 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
	*/

	return -EINVAL;
	}

	/* 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);
	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_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;
	case REMOTE_KEY_REPEAT:
	deb_rc("key repeated\n");
	input_event(d->rc_input_dev, EV_KEY, event, 1);
	input_sync(d->rc_input_dev);
	input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
	input_sync(d->rc_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_interval));
	}

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

	if (d->props.rc_key_map == NULL \|\|
	d->props.rc_query == NULL \|\|
	dvb_usb_disable_rc_polling)
	return 0;

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

	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;
	input_dev->getkeycode = dvb_usb_getkeycode;
	input_dev->setkeycode = dvb_usb_setkeycode;

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

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

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

	input_set_drvdata(input_dev, d);

	err = input_register_device(input_dev);
	if (err) {
	input_free_device(input_dev);
	return err;
	}

	d->rc_input_dev = input_dev;

	INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control);

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

	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_rearming_delayed_work(&d->rc_query_work);
	flush_scheduled_work();
	input_unregister_device(d->rc_input_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 dvb_usb_rc_key *keymap = d->props.rc_key_map;
	*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_key_map_size; i++)
	if (rc5_custom(&keymap[i]) == keybuf[1] &&
	rc5_data(&keymap[i]) == keybuf[3]) {
	*event = keymap[i].event;
	*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);