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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Loopback driver for rc-core,
*
* Copyright (c) 2010 David Härdeman <david@hardeman.nu>
*
* This driver receives TX data and passes it back as RX data,
* which is useful for (scripted) debugging of rc-core without
* having to use actual hardware.
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <media/rc-core.h>
#define DRIVER_NAME "rc-loopback"
#define RXMASK_NARROWBAND 0x1
#define RXMASK_WIDEBAND 0x2
struct loopback_dev {
struct rc_dev *dev;
u32 txmask;
u32 txcarrier;
u32 txduty;
bool idle;
bool wideband;
bool carrierreport;
u32 rxcarriermin;
u32 rxcarriermax;
};
static struct loopback_dev loopdev;
static int loop_set_tx_mask(struct rc_dev *dev, u32 mask)
{
struct loopback_dev *lodev = dev->priv;
if ((mask & (RXMASK_NARROWBAND | RXMASK_WIDEBAND)) != mask) {
dev_dbg(&dev->dev, "invalid tx mask: %u\n", mask);
return 2;
}
dev_dbg(&dev->dev, "setting tx mask: %u\n", mask);
lodev->txmask = mask;
return 0;
}
static int loop_set_tx_carrier(struct rc_dev *dev, u32 carrier)
{
struct loopback_dev *lodev = dev->priv;
dev_dbg(&dev->dev, "setting tx carrier: %u\n", carrier);
lodev->txcarrier = carrier;
return 0;
}
static int loop_set_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
{
struct loopback_dev *lodev = dev->priv;
if (duty_cycle < 1 || duty_cycle > 99) {
dev_dbg(&dev->dev, "invalid duty cycle: %u\n", duty_cycle);
return -EINVAL;
}
dev_dbg(&dev->dev, "setting duty cycle: %u\n", duty_cycle);
lodev->txduty = duty_cycle;
return 0;
}
static int loop_set_rx_carrier_range(struct rc_dev *dev, u32 min, u32 max)
{
struct loopback_dev *lodev = dev->priv;
if (min < 1 || min > max) {
dev_dbg(&dev->dev, "invalid rx carrier range %u to %u\n", min, max);
return -EINVAL;
}
dev_dbg(&dev->dev, "setting rx carrier range %u to %u\n", min, max);
lodev->rxcarriermin = min;
lodev->rxcarriermax = max;
return 0;
}
static int loop_tx_ir(struct rc_dev *dev, unsigned *txbuf, unsigned count)
{
struct loopback_dev *lodev = dev->priv;
u32 rxmask;
unsigned i;
struct ir_raw_event rawir = {};
if (lodev->txcarrier < lodev->rxcarriermin ||
lodev->txcarrier > lodev->rxcarriermax) {
dev_dbg(&dev->dev, "ignoring tx, carrier out of range\n");
goto out;
}
if (lodev->wideband)
rxmask = RXMASK_WIDEBAND;
else
rxmask = RXMASK_NARROWBAND;
if (!(rxmask & lodev->txmask)) {
dev_dbg(&dev->dev, "ignoring tx, rx mask mismatch\n");
goto out;
}
for (i = 0; i < count; i++) {
rawir.pulse = i % 2 ? false : true;
rawir.duration = txbuf[i];
ir_raw_event_store_with_filter(dev, &rawir);
}
if (lodev->carrierreport) {
rawir.pulse = false;
rawir.carrier_report = true;
rawir.carrier = lodev->txcarrier;
ir_raw_event_store(dev, &rawir);
}
/* Fake a silence long enough to cause us to go idle */
rawir.pulse = false;
rawir.duration = dev->timeout;
ir_raw_event_store_with_filter(dev, &rawir);
ir_raw_event_handle(dev);
out:
return count;
}
static void loop_set_idle(struct rc_dev *dev, bool enable)
{
struct loopback_dev *lodev = dev->priv;
if (lodev->idle != enable) {
dev_dbg(&dev->dev, "%sing idle mode\n", enable ? "enter" : "exit");
lodev->idle = enable;
}
}
static int loop_set_wideband_receiver(struct rc_dev *dev, int enable)
{
struct loopback_dev *lodev = dev->priv;
if (lodev->wideband != enable) {
dev_dbg(&dev->dev, "using %sband receiver\n", enable ? "wide" : "narrow");
lodev->wideband = !!enable;
}
return 0;
}
static int loop_set_carrier_report(struct rc_dev *dev, int enable)
{
struct loopback_dev *lodev = dev->priv;
if (lodev->carrierreport != enable) {
dev_dbg(&dev->dev, "%sabling carrier reports\n", enable ? "en" : "dis");
lodev->carrierreport = !!enable;
}
return 0;
}
static int loop_set_wakeup_filter(struct rc_dev *dev,
struct rc_scancode_filter *sc)
{
static const unsigned int max = 512;
struct ir_raw_event *raw;
int ret;
int i;
/* fine to disable filter */
if (!sc->mask)
return 0;
/* encode the specified filter and loop it back */
raw = kmalloc_array(max, sizeof(*raw), GFP_KERNEL);
if (!raw)
return -ENOMEM;
ret = ir_raw_encode_scancode(dev->wakeup_protocol, sc->data, raw, max);
/* still loop back the partial raw IR even if it's incomplete */
if (ret == -ENOBUFS)
ret = max;
if (ret >= 0) {
/* do the loopback */
for (i = 0; i < ret; ++i)
ir_raw_event_store(dev, &raw[i]);
ir_raw_event_handle(dev);
ret = 0;
}
kfree(raw);
return ret;
}
static int __init loop_init(void)
{
struct rc_dev *rc;
int ret;
rc = rc_allocate_device(RC_DRIVER_IR_RAW);
if (!rc)
return -ENOMEM;
rc->device_name = "rc-core loopback device";
rc->input_phys = "rc-core/virtual";
rc->input_id.bustype = BUS_VIRTUAL;
rc->input_id.version = 1;
rc->driver_name = DRIVER_NAME;
rc->map_name = RC_MAP_EMPTY;
rc->priv = &loopdev;
rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
rc->allowed_wakeup_protocols = RC_PROTO_BIT_ALL_IR_ENCODER;
rc->encode_wakeup = true;
rc->timeout = IR_DEFAULT_TIMEOUT;
rc->min_timeout = 1;
rc->max_timeout = IR_MAX_TIMEOUT;
rc->rx_resolution = 1;
rc->tx_resolution = 1;
rc->s_tx_mask = loop_set_tx_mask;
rc->s_tx_carrier = loop_set_tx_carrier;
rc->s_tx_duty_cycle = loop_set_tx_duty_cycle;
rc->s_rx_carrier_range = loop_set_rx_carrier_range;
rc->tx_ir = loop_tx_ir;
rc->s_idle = loop_set_idle;
rc->s_wideband_receiver = loop_set_wideband_receiver;
rc->s_carrier_report = loop_set_carrier_report;
rc->s_wakeup_filter = loop_set_wakeup_filter;
loopdev.txmask = RXMASK_NARROWBAND;
loopdev.txcarrier = 36000;
loopdev.txduty = 50;
loopdev.rxcarriermin = 1;
loopdev.rxcarriermax = ~0;
loopdev.idle = true;
loopdev.wideband = false;
loopdev.carrierreport = false;
ret = rc_register_device(rc);
if (ret < 0) {
dev_err(&rc->dev, "rc_dev registration failed\n");
rc_free_device(rc);
return ret;
}
loopdev.dev = rc;
return 0;
}
static void __exit loop_exit(void)
{
rc_unregister_device(loopdev.dev);
}
module_init(loop_init);
module_exit(loop_exit);
MODULE_DESCRIPTION("Loopback device for rc-core debugging");
MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
MODULE_LICENSE("GPL");
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