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528222d853
rc-core kapi uses nanoseconds for infrared durations for receiving, and microseconds for sending. The uapi already uses microseconds for both, so this patch does not change the uapi. Infrared durations do not need nanosecond resolution. IR protocols do not have durations shorter than about 100 microseconds. Some IR hardware offers 250 microseconds resolution, which is sufficient for most protocols. Better hardware has 50 microsecond resolution and is enough for every protocol I am aware off. Unify on microseconds everywhere. This simplifies the code since less conversion between microseconds and nanoseconds needs to be done. This affects: - rx_resolution member of struct rc_dev - timeout member of struct rc_dev - duration member in struct ir_raw_event Cc: "Bruno Prémont" <bonbons@linux-vserver.org> Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Patrick Lerda <patrick9876@free.fr> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Neil Armstrong <narmstrong@baylibre.com> Cc: Jerome Brunet <jbrunet@baylibre.com> Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Cc: Sean Wang <sean.wang@mediatek.com> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Patrice Chotard <patrice.chotard@st.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Chen-Yu Tsai <wens@csie.org> Cc: "David Härdeman" <david@hardeman.nu> Cc: Benjamin Valentin <benpicco@googlemail.com> Cc: Antti Palosaari <crope@iki.fi> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
271 lines
6.1 KiB
C
271 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Loopback driver for rc-core,
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*
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* Copyright (c) 2010 David Härdeman <david@hardeman.nu>
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*
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* This driver receives TX data and passes it back as RX data,
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* which is useful for (scripted) debugging of rc-core without
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* having to use actual hardware.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <media/rc-core.h>
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#define DRIVER_NAME "rc-loopback"
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#define dprintk(x...) if (debug) printk(KERN_INFO DRIVER_NAME ": " x)
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#define RXMASK_REGULAR 0x1
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#define RXMASK_LEARNING 0x2
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static bool debug;
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struct loopback_dev {
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struct rc_dev *dev;
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u32 txmask;
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u32 txcarrier;
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u32 txduty;
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bool idle;
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bool learning;
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bool carrierreport;
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u32 rxcarriermin;
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u32 rxcarriermax;
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};
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static struct loopback_dev loopdev;
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static int loop_set_tx_mask(struct rc_dev *dev, u32 mask)
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{
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struct loopback_dev *lodev = dev->priv;
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if ((mask & (RXMASK_REGULAR | RXMASK_LEARNING)) != mask) {
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dprintk("invalid tx mask: %u\n", mask);
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return -EINVAL;
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}
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dprintk("setting tx mask: %u\n", mask);
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lodev->txmask = mask;
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return 0;
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}
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static int loop_set_tx_carrier(struct rc_dev *dev, u32 carrier)
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{
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struct loopback_dev *lodev = dev->priv;
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dprintk("setting tx carrier: %u\n", carrier);
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lodev->txcarrier = carrier;
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return 0;
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}
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static int loop_set_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
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{
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struct loopback_dev *lodev = dev->priv;
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if (duty_cycle < 1 || duty_cycle > 99) {
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dprintk("invalid duty cycle: %u\n", duty_cycle);
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return -EINVAL;
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}
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dprintk("setting duty cycle: %u\n", duty_cycle);
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lodev->txduty = duty_cycle;
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return 0;
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}
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static int loop_set_rx_carrier_range(struct rc_dev *dev, u32 min, u32 max)
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{
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struct loopback_dev *lodev = dev->priv;
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if (min < 1 || min > max) {
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dprintk("invalid rx carrier range %u to %u\n", min, max);
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return -EINVAL;
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}
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dprintk("setting rx carrier range %u to %u\n", min, max);
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lodev->rxcarriermin = min;
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lodev->rxcarriermax = max;
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return 0;
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}
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static int loop_tx_ir(struct rc_dev *dev, unsigned *txbuf, unsigned count)
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{
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struct loopback_dev *lodev = dev->priv;
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u32 rxmask;
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unsigned i;
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struct ir_raw_event rawir = {};
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if (lodev->txcarrier < lodev->rxcarriermin ||
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lodev->txcarrier > lodev->rxcarriermax) {
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dprintk("ignoring tx, carrier out of range\n");
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goto out;
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}
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if (lodev->learning)
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rxmask = RXMASK_LEARNING;
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else
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rxmask = RXMASK_REGULAR;
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if (!(rxmask & lodev->txmask)) {
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dprintk("ignoring tx, rx mask mismatch\n");
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goto out;
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}
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for (i = 0; i < count; i++) {
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rawir.pulse = i % 2 ? false : true;
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rawir.duration = txbuf[i];
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if (rawir.duration)
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ir_raw_event_store_with_filter(dev, &rawir);
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}
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/* Fake a silence long enough to cause us to go idle */
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rawir.pulse = false;
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rawir.duration = dev->timeout;
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ir_raw_event_store_with_filter(dev, &rawir);
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ir_raw_event_handle(dev);
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out:
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return count;
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}
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static void loop_set_idle(struct rc_dev *dev, bool enable)
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{
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struct loopback_dev *lodev = dev->priv;
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if (lodev->idle != enable) {
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dprintk("%sing idle mode\n", enable ? "enter" : "exit");
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lodev->idle = enable;
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}
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}
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static int loop_set_learning_mode(struct rc_dev *dev, int enable)
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{
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struct loopback_dev *lodev = dev->priv;
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if (lodev->learning != enable) {
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dprintk("%sing learning mode\n", enable ? "enter" : "exit");
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lodev->learning = !!enable;
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}
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return 0;
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}
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static int loop_set_carrier_report(struct rc_dev *dev, int enable)
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{
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struct loopback_dev *lodev = dev->priv;
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if (lodev->carrierreport != enable) {
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dprintk("%sabling carrier reports\n", enable ? "en" : "dis");
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lodev->carrierreport = !!enable;
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}
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return 0;
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}
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static int loop_set_wakeup_filter(struct rc_dev *dev,
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struct rc_scancode_filter *sc)
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{
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static const unsigned int max = 512;
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struct ir_raw_event *raw;
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int ret;
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int i;
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/* fine to disable filter */
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if (!sc->mask)
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return 0;
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/* encode the specified filter and loop it back */
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raw = kmalloc_array(max, sizeof(*raw), GFP_KERNEL);
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if (!raw)
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return -ENOMEM;
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ret = ir_raw_encode_scancode(dev->wakeup_protocol, sc->data, raw, max);
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/* still loop back the partial raw IR even if it's incomplete */
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if (ret == -ENOBUFS)
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ret = max;
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if (ret >= 0) {
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/* do the loopback */
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for (i = 0; i < ret; ++i)
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ir_raw_event_store(dev, &raw[i]);
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ir_raw_event_handle(dev);
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ret = 0;
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}
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kfree(raw);
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return ret;
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}
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static int __init loop_init(void)
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{
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struct rc_dev *rc;
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int ret;
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rc = rc_allocate_device(RC_DRIVER_IR_RAW);
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if (!rc) {
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printk(KERN_ERR DRIVER_NAME ": rc_dev allocation failed\n");
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return -ENOMEM;
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}
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rc->device_name = "rc-core loopback device";
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rc->input_phys = "rc-core/virtual";
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rc->input_id.bustype = BUS_VIRTUAL;
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rc->input_id.version = 1;
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rc->driver_name = DRIVER_NAME;
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rc->map_name = RC_MAP_EMPTY;
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rc->priv = &loopdev;
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rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
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rc->allowed_wakeup_protocols = RC_PROTO_BIT_ALL_IR_ENCODER;
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rc->encode_wakeup = true;
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rc->timeout = MS_TO_US(100); /* 100 ms */
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rc->min_timeout = 1;
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rc->max_timeout = UINT_MAX;
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rc->rx_resolution = 1;
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rc->tx_resolution = 1;
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rc->s_tx_mask = loop_set_tx_mask;
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rc->s_tx_carrier = loop_set_tx_carrier;
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rc->s_tx_duty_cycle = loop_set_tx_duty_cycle;
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rc->s_rx_carrier_range = loop_set_rx_carrier_range;
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rc->tx_ir = loop_tx_ir;
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rc->s_idle = loop_set_idle;
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rc->s_learning_mode = loop_set_learning_mode;
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rc->s_carrier_report = loop_set_carrier_report;
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rc->s_wakeup_filter = loop_set_wakeup_filter;
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loopdev.txmask = RXMASK_REGULAR;
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loopdev.txcarrier = 36000;
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loopdev.txduty = 50;
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loopdev.rxcarriermin = 1;
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loopdev.rxcarriermax = ~0;
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loopdev.idle = true;
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loopdev.learning = false;
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loopdev.carrierreport = false;
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ret = rc_register_device(rc);
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if (ret < 0) {
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printk(KERN_ERR DRIVER_NAME ": rc_dev registration failed\n");
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rc_free_device(rc);
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return ret;
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}
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loopdev.dev = rc;
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return 0;
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}
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static void __exit loop_exit(void)
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{
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rc_unregister_device(loopdev.dev);
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}
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module_init(loop_init);
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module_exit(loop_exit);
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module_param(debug, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Enable debug messages");
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MODULE_DESCRIPTION("Loopback device for rc-core debugging");
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MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
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MODULE_LICENSE("GPL");
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