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If an IR command is sent (using the LIRC userspace) to rc-loopback which doesn't include a trailing space, the result is that the message won't be completely decoded. In addition, "leftovers" from a previous transmission can be left until the next one. Fix this by faking a long silence after the end of TX data. Signed-off-by: David Härdeman <david@hardeman.nu> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
267 lines
6.4 KiB
C
267 lines
6.4 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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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 <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, int *txbuf, u32 n)
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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 count;
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unsigned total_duration = 0;
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unsigned i;
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DEFINE_IR_RAW_EVENT(rawir);
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if (n == 0 || n % sizeof(int)) {
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dprintk("invalid tx buffer size\n");
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return -EINVAL;
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}
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count = n / sizeof(int);
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for (i = 0; i < count; i++)
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total_duration += abs(txbuf[i]);
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if (total_duration == 0) {
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dprintk("invalid tx data, total duration zero\n");
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return -EINVAL;
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}
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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 = abs(txbuf[i]) * 1000;
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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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/* Lirc expects this function to take as long as the total duration */
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set_current_state(TASK_INTERRUPTIBLE);
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schedule_timeout(usecs_to_jiffies(total_duration));
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return n;
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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 __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();
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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->input_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->driver_type = RC_DRIVER_IR_RAW;
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rc->allowed_protos = RC_TYPE_ALL;
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rc->timeout = 100 * 1000 * 1000; /* 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 = 1000;
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rc->tx_resolution = 1000;
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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->priv = &loopdev;
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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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