// SPDX-License-Identifier: GPL-2.0
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/* dvb-usb-remote.c is part of the DVB USB library.
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*
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* Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)
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* see dvb-usb-init.c for copyright information.
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*
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* This file contains functions for initializing the input-device and for handling remote-control-queries.
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*/
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#include "dvb-usb-common.h"
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#include <linux/usb/input.h>
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static unsigned int
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legacy_dvb_usb_get_keymap_index(const struct input_keymap_entry *ke,
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struct rc_map_table *keymap,
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unsigned int keymap_size)
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{
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unsigned int index;
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unsigned int scancode;
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if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
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index = ke->index;
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} else {
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if (input_scancode_to_scalar(ke, &scancode))
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return keymap_size;
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/* See if we can match the raw key code. */
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for (index = 0; index < keymap_size; index++)
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if (keymap[index].scancode == scancode)
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break;
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/* See if there is an unused hole in the map */
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if (index >= keymap_size) {
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for (index = 0; index < keymap_size; index++) {
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if (keymap[index].keycode == KEY_RESERVED ||
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keymap[index].keycode == KEY_UNKNOWN) {
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break;
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}
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}
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}
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}
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return index;
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}
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static int legacy_dvb_usb_getkeycode(struct input_dev *dev,
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struct input_keymap_entry *ke)
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{
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struct dvb_usb_device *d = input_get_drvdata(dev);
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struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
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unsigned int keymap_size = d->props.rc.legacy.rc_map_size;
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unsigned int index;
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index = legacy_dvb_usb_get_keymap_index(ke, keymap, keymap_size);
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if (index >= keymap_size)
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return -EINVAL;
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ke->keycode = keymap[index].keycode;
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if (ke->keycode == KEY_UNKNOWN)
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ke->keycode = KEY_RESERVED;
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ke->len = sizeof(keymap[index].scancode);
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memcpy(&ke->scancode, &keymap[index].scancode, ke->len);
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ke->index = index;
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return 0;
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}
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static int legacy_dvb_usb_setkeycode(struct input_dev *dev,
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const struct input_keymap_entry *ke,
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unsigned int *old_keycode)
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{
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struct dvb_usb_device *d = input_get_drvdata(dev);
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struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
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unsigned int keymap_size = d->props.rc.legacy.rc_map_size;
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unsigned int index;
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index = legacy_dvb_usb_get_keymap_index(ke, keymap, keymap_size);
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/*
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* FIXME: Currently, it is not possible to increase the size of
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* scancode table. For it to happen, one possibility
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* would be to allocate a table with key_map_size + 1,
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* copying data, appending the new key on it, and freeing
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* the old one - or maybe just allocating some spare space
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*/
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if (index >= keymap_size)
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return -EINVAL;
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*old_keycode = keymap[index].keycode;
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keymap->keycode = ke->keycode;
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__set_bit(ke->keycode, dev->keybit);
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if (*old_keycode != KEY_RESERVED) {
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__clear_bit(*old_keycode, dev->keybit);
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for (index = 0; index < keymap_size; index++) {
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if (keymap[index].keycode == *old_keycode) {
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__set_bit(*old_keycode, dev->keybit);
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break;
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}
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}
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}
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return 0;
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}
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/* Remote-control poll function - called every dib->rc_query_interval ms to see
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* whether the remote control has received anything.
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*
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* TODO: Fix the repeat rate of the input device.
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*/
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static void legacy_dvb_usb_read_remote_control(struct work_struct *work)
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{
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struct dvb_usb_device *d =
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container_of(work, struct dvb_usb_device, rc_query_work.work);
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u32 event;
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int state;
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/* TODO: need a lock here. We can simply skip checking for the remote control
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if we're busy. */
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/* when the parameter has been set to 1 via sysfs while the driver was running */
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if (dvb_usb_disable_rc_polling)
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return;
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if (d->props.rc.legacy.rc_query(d,&event,&state)) {
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err("error while querying for an remote control event.");
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goto schedule;
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}
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switch (state) {
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case REMOTE_NO_KEY_PRESSED:
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break;
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case REMOTE_KEY_PRESSED:
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deb_rc("key pressed\n");
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d->last_event = event;
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input_event(d->input_dev, EV_KEY, event, 1);
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input_sync(d->input_dev);
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input_event(d->input_dev, EV_KEY, d->last_event, 0);
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input_sync(d->input_dev);
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break;
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case REMOTE_KEY_REPEAT:
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deb_rc("key repeated\n");
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input_event(d->input_dev, EV_KEY, event, 1);
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input_sync(d->input_dev);
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input_event(d->input_dev, EV_KEY, d->last_event, 0);
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input_sync(d->input_dev);
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break;
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default:
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break;
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}
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/* improved repeat handling ???
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switch (state) {
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case REMOTE_NO_KEY_PRESSED:
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deb_rc("NO KEY PRESSED\n");
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if (d->last_state != REMOTE_NO_KEY_PRESSED) {
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deb_rc("releasing event %d\n",d->last_event);
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input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
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input_sync(d->rc_input_dev);
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}
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d->last_state = REMOTE_NO_KEY_PRESSED;
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d->last_event = 0;
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break;
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case REMOTE_KEY_PRESSED:
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deb_rc("KEY PRESSED\n");
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deb_rc("pressing event %d\n",event);
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input_event(d->rc_input_dev, EV_KEY, event, 1);
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input_sync(d->rc_input_dev);
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d->last_event = event;
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d->last_state = REMOTE_KEY_PRESSED;
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break;
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case REMOTE_KEY_REPEAT:
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deb_rc("KEY_REPEAT\n");
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if (d->last_state != REMOTE_NO_KEY_PRESSED) {
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deb_rc("repeating event %d\n",d->last_event);
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input_event(d->rc_input_dev, EV_KEY, d->last_event, 2);
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input_sync(d->rc_input_dev);
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d->last_state = REMOTE_KEY_REPEAT;
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}
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default:
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break;
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}
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*/
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schedule:
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schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc.legacy.rc_interval));
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}
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static int legacy_dvb_usb_remote_init(struct dvb_usb_device *d)
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{
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int i, err, rc_interval;
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struct input_dev *input_dev;
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input_dev = input_allocate_device();
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if (!input_dev)
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return -ENOMEM;
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input_dev->evbit[0] = BIT_MASK(EV_KEY);
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input_dev->name = "IR-receiver inside an USB DVB receiver";
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input_dev->phys = d->rc_phys;
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usb_to_input_id(d->udev, &input_dev->id);
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input_dev->dev.parent = &d->udev->dev;
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d->input_dev = input_dev;
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d->rc_dev = NULL;
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input_dev->getkeycode = legacy_dvb_usb_getkeycode;
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input_dev->setkeycode = legacy_dvb_usb_setkeycode;
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/* set the bits for the keys */
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deb_rc("key map size: %d\n", d->props.rc.legacy.rc_map_size);
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for (i = 0; i < d->props.rc.legacy.rc_map_size; i++) {
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deb_rc("setting bit for event %d item %d\n",
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d->props.rc.legacy.rc_map_table[i].keycode, i);
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set_bit(d->props.rc.legacy.rc_map_table[i].keycode, input_dev->keybit);
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}
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/* setting these two values to non-zero, we have to manage key repeats */
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input_dev->rep[REP_PERIOD] = d->props.rc.legacy.rc_interval;
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input_dev->rep[REP_DELAY] = d->props.rc.legacy.rc_interval + 150;
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input_set_drvdata(input_dev, d);
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err = input_register_device(input_dev);
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if (err)
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input_free_device(input_dev);
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rc_interval = d->props.rc.legacy.rc_interval;
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INIT_DELAYED_WORK(&d->rc_query_work, legacy_dvb_usb_read_remote_control);
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info("schedule remote query interval to %d msecs.", rc_interval);
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schedule_delayed_work(&d->rc_query_work,
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msecs_to_jiffies(rc_interval));
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d->state |= DVB_USB_STATE_REMOTE;
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return err;
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}
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/* Remote-control poll function - called every dib->rc_query_interval ms to see
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* whether the remote control has received anything.
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*
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* TODO: Fix the repeat rate of the input device.
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*/
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static void dvb_usb_read_remote_control(struct work_struct *work)
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{
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struct dvb_usb_device *d =
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container_of(work, struct dvb_usb_device, rc_query_work.work);
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int err;
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/* TODO: need a lock here. We can simply skip checking for the remote control
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if we're busy. */
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/* when the parameter has been set to 1 via sysfs while the
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* driver was running, or when bulk mode is enabled after IR init
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*/
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if (dvb_usb_disable_rc_polling || d->props.rc.core.bulk_mode)
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return;
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err = d->props.rc.core.rc_query(d);
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if (err)
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err("error %d while querying for an remote control event.", err);
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schedule_delayed_work(&d->rc_query_work,
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msecs_to_jiffies(d->props.rc.core.rc_interval));
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}
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static int rc_core_dvb_usb_remote_init(struct dvb_usb_device *d)
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{
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int err, rc_interval;
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struct rc_dev *dev;
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dev = rc_allocate_device(d->props.rc.core.driver_type);
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if (!dev)
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return -ENOMEM;
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dev->driver_name = d->props.rc.core.module_name;
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dev->map_name = d->props.rc.core.rc_codes;
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dev->change_protocol = d->props.rc.core.change_protocol;
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dev->allowed_protocols = d->props.rc.core.allowed_protos;
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usb_to_input_id(d->udev, &dev->input_id);
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dev->device_name = d->desc->name;
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dev->input_phys = d->rc_phys;
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dev->dev.parent = &d->udev->dev;
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dev->priv = d;
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dev->scancode_mask = d->props.rc.core.scancode_mask;
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err = rc_register_device(dev);
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if (err < 0) {
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rc_free_device(dev);
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return err;
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}
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d->input_dev = NULL;
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d->rc_dev = dev;
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if (!d->props.rc.core.rc_query || d->props.rc.core.bulk_mode)
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return 0;
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/* Polling mode - initialize a work queue for handling it */
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INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control);
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rc_interval = d->props.rc.core.rc_interval;
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info("schedule remote query interval to %d msecs.", rc_interval);
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schedule_delayed_work(&d->rc_query_work,
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msecs_to_jiffies(rc_interval));
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return 0;
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}
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int dvb_usb_remote_init(struct dvb_usb_device *d)
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{
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int err;
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if (dvb_usb_disable_rc_polling)
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return 0;
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if (d->props.rc.legacy.rc_map_table && d->props.rc.legacy.rc_query)
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d->props.rc.mode = DVB_RC_LEGACY;
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else if (d->props.rc.core.rc_codes)
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d->props.rc.mode = DVB_RC_CORE;
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else
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return 0;
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usb_make_path(d->udev, d->rc_phys, sizeof(d->rc_phys));
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strlcat(d->rc_phys, "/ir0", sizeof(d->rc_phys));
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/* Start the remote-control polling. */
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if (d->props.rc.legacy.rc_interval < 40)
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d->props.rc.legacy.rc_interval = 100; /* default */
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if (d->props.rc.mode == DVB_RC_LEGACY)
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err = legacy_dvb_usb_remote_init(d);
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else
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err = rc_core_dvb_usb_remote_init(d);
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if (err)
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return err;
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d->state |= DVB_USB_STATE_REMOTE;
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return 0;
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}
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int dvb_usb_remote_exit(struct dvb_usb_device *d)
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{
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if (d->state & DVB_USB_STATE_REMOTE) {
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cancel_delayed_work_sync(&d->rc_query_work);
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if (d->props.rc.mode == DVB_RC_LEGACY)
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input_unregister_device(d->input_dev);
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else
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rc_unregister_device(d->rc_dev);
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}
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d->state &= ~DVB_USB_STATE_REMOTE;
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return 0;
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}
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#define DVB_USB_RC_NEC_EMPTY 0x00
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#define DVB_USB_RC_NEC_KEY_PRESSED 0x01
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#define DVB_USB_RC_NEC_KEY_REPEATED 0x02
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int dvb_usb_nec_rc_key_to_event(struct dvb_usb_device *d,
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u8 keybuf[5], u32 *event, int *state)
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{
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int i;
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struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
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*event = 0;
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*state = REMOTE_NO_KEY_PRESSED;
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switch (keybuf[0]) {
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case DVB_USB_RC_NEC_EMPTY:
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break;
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case DVB_USB_RC_NEC_KEY_PRESSED:
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if ((u8) ~keybuf[1] != keybuf[2] ||
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(u8) ~keybuf[3] != keybuf[4]) {
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deb_err("remote control checksum failed.\n");
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break;
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}
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/* See if we can match the raw key code. */
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for (i = 0; i < d->props.rc.legacy.rc_map_size; i++)
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if (rc5_custom(&keymap[i]) == keybuf[1] &&
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rc5_data(&keymap[i]) == keybuf[3]) {
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*event = keymap[i].keycode;
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*state = REMOTE_KEY_PRESSED;
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return 0;
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}
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deb_err("key mapping failed - no appropriate key found in keymapping\n");
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break;
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case DVB_USB_RC_NEC_KEY_REPEATED:
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*state = REMOTE_KEY_REPEAT;
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break;
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default:
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deb_err("unknown type of remote status: %d\n",keybuf[0]);
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break;
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}
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return 0;
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}
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EXPORT_SYMBOL(dvb_usb_nec_rc_key_to_event);
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