Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 840 insertions, 0 deletions

diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
new file mode 100644
index 0000000000..a537734832
--- /dev/null
+++ b/drivers/media/rc/lirc_dev.c
@@ -0,0 +1,840 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * LIRC base driver
+ *
+ * by Artur Lipowski <alipowski@interia.pl>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/file.h>
+#include <linux/idr.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+
+#include "rc-core-priv.h"
+#include <uapi/linux/lirc.h>
+
+#define LIRCBUF_SIZE	1024
+
+static dev_t lirc_base_dev;
+
+/* Used to keep track of allocated lirc devices */
+static DEFINE_IDA(lirc_ida);
+
+/* Only used for sysfs but defined to void otherwise */
+static struct class *lirc_class;
+
+/**
+ * lirc_raw_event() - Send raw IR data to lirc to be relayed to userspace
+ *
+ * @dev:	the struct rc_dev descriptor of the device
+ * @ev:		the struct ir_raw_event descriptor of the pulse/space
+ */
+void lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
+{
+	unsigned long flags;
+	struct lirc_fh *fh;
+	int sample;
+
+	/* Receiver overflow, data missing */
+	if (ev.overflow) {
+		/*
+		 * Send lirc overflow message. This message is unknown to
+		 * lircd, but it will interpret this as a long space as
+		 * long as the value is set to high value. This resets its
+		 * decoder state.
+		 */
+		sample = LIRC_OVERFLOW(LIRC_VALUE_MASK);
+		dev_dbg(&dev->dev, "delivering overflow to lirc_dev\n");
+
+	/* Carrier reports */
+	} else if (ev.carrier_report) {
+		sample = LIRC_FREQUENCY(ev.carrier);
+		dev_dbg(&dev->dev, "carrier report (freq: %d)\n", sample);
+
+	/* Packet end */
+	} else if (ev.timeout) {
+		dev->gap_start = ktime_get();
+
+		sample = LIRC_TIMEOUT(ev.duration);
+		dev_dbg(&dev->dev, "timeout report (duration: %d)\n", sample);
+
+	/* Normal sample */
+	} else {
+		if (dev->gap_start) {
+			u64 duration = ktime_us_delta(ktime_get(),
+						      dev->gap_start);
+
+			/* Cap by LIRC_VALUE_MASK */
+			duration = min_t(u64, duration, LIRC_VALUE_MASK);
+
+			spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+			list_for_each_entry(fh, &dev->lirc_fh, list)
+				kfifo_put(&fh->rawir, LIRC_SPACE(duration));
+			spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
+			dev->gap_start = 0;
+		}
+
+		sample = ev.pulse ? LIRC_PULSE(ev.duration) :
+					LIRC_SPACE(ev.duration);
+		dev_dbg(&dev->dev, "delivering %uus %s to lirc_dev\n",
+			ev.duration, TO_STR(ev.pulse));
+	}
+
+	/*
+	 * bpf does not care about the gap generated above; that exists
+	 * for backwards compatibility
+	 */
+	lirc_bpf_run(dev, sample);
+
+	spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+	list_for_each_entry(fh, &dev->lirc_fh, list) {
+		if (kfifo_put(&fh->rawir, sample))
+			wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM);
+	}
+	spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
+}
+
+/**
+ * lirc_scancode_event() - Send scancode data to lirc to be relayed to
+ *		userspace. This can be called in atomic context.
+ * @dev:	the struct rc_dev descriptor of the device
+ * @lsc:	the struct lirc_scancode describing the decoded scancode
+ */
+void lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc)
+{
+	unsigned long flags;
+	struct lirc_fh *fh;
+
+	lsc->timestamp = ktime_get_ns();
+
+	spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+	list_for_each_entry(fh, &dev->lirc_fh, list) {
+		if (kfifo_put(&fh->scancodes, *lsc))
+			wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM);
+	}
+	spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
+}
+EXPORT_SYMBOL_GPL(lirc_scancode_event);
+
+static int lirc_open(struct inode *inode, struct file *file)
+{
+	struct rc_dev *dev = container_of(inode->i_cdev, struct rc_dev,
+					  lirc_cdev);
+	struct lirc_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
+	unsigned long flags;
+	int retval;
+
+	if (!fh)
+		return -ENOMEM;
+
+	get_device(&dev->dev);
+
+	if (!dev->registered) {
+		retval = -ENODEV;
+		goto out_fh;
+	}
+
+	if (dev->driver_type == RC_DRIVER_IR_RAW) {
+		if (kfifo_alloc(&fh->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL)) {
+			retval = -ENOMEM;
+			goto out_fh;
+		}
+	}
+
+	if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
+		if (kfifo_alloc(&fh->scancodes, 32, GFP_KERNEL)) {
+			retval = -ENOMEM;
+			goto out_rawir;
+		}
+	}
+
+	fh->send_mode = LIRC_MODE_PULSE;
+	fh->rc = dev;
+
+	if (dev->driver_type == RC_DRIVER_SCANCODE)
+		fh->rec_mode = LIRC_MODE_SCANCODE;
+	else
+		fh->rec_mode = LIRC_MODE_MODE2;
+
+	retval = rc_open(dev);
+	if (retval)
+		goto out_kfifo;
+
+	init_waitqueue_head(&fh->wait_poll);
+
+	file->private_data = fh;
+	spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+	list_add(&fh->list, &dev->lirc_fh);
+	spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
+
+	stream_open(inode, file);
+
+	return 0;
+out_kfifo:
+	if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
+		kfifo_free(&fh->scancodes);
+out_rawir:
+	if (dev->driver_type == RC_DRIVER_IR_RAW)
+		kfifo_free(&fh->rawir);
+out_fh:
+	kfree(fh);
+	put_device(&dev->dev);
+
+	return retval;
+}
+
+static int lirc_close(struct inode *inode, struct file *file)
+{
+	struct lirc_fh *fh = file->private_data;
+	struct rc_dev *dev = fh->rc;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+	list_del(&fh->list);
+	spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
+
+	if (dev->driver_type == RC_DRIVER_IR_RAW)
+		kfifo_free(&fh->rawir);
+	if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
+		kfifo_free(&fh->scancodes);
+	kfree(fh);
+
+	rc_close(dev);
+	put_device(&dev->dev);
+
+	return 0;
+}
+
+static ssize_t lirc_transmit(struct file *file, const char __user *buf,
+			     size_t n, loff_t *ppos)
+{
+	struct lirc_fh *fh = file->private_data;
+	struct rc_dev *dev = fh->rc;
+	unsigned int *txbuf;
+	struct ir_raw_event *raw = NULL;
+	ssize_t ret;
+	size_t count;
+	ktime_t start;
+	s64 towait;
+	unsigned int duration = 0; /* signal duration in us */
+	int i;
+
+	ret = mutex_lock_interruptible(&dev->lock);
+	if (ret)
+		return ret;
+
+	if (!dev->registered) {
+		ret = -ENODEV;
+		goto out_unlock;
+	}
+
+	if (!dev->tx_ir) {
+		ret = -EINVAL;
+		goto out_unlock;
+	}
+
+	if (fh->send_mode == LIRC_MODE_SCANCODE) {
+		struct lirc_scancode scan;
+
+		if (n != sizeof(scan)) {
+			ret = -EINVAL;
+			goto out_unlock;
+		}
+
+		if (copy_from_user(&scan, buf, sizeof(scan))) {
+			ret = -EFAULT;
+			goto out_unlock;
+		}
+
+		if (scan.flags || scan.keycode || scan.timestamp ||
+		    scan.rc_proto > RC_PROTO_MAX) {
+			ret = -EINVAL;
+			goto out_unlock;
+		}
+
+		/* We only have encoders for 32-bit protocols. */
+		if (scan.scancode > U32_MAX ||
+		    !rc_validate_scancode(scan.rc_proto, scan.scancode)) {
+			ret = -EINVAL;
+			goto out_unlock;
+		}
+
+		raw = kmalloc_array(LIRCBUF_SIZE, sizeof(*raw), GFP_KERNEL);
+		if (!raw) {
+			ret = -ENOMEM;
+			goto out_unlock;
+		}
+
+		ret = ir_raw_encode_scancode(scan.rc_proto, scan.scancode,
+					     raw, LIRCBUF_SIZE);
+		if (ret < 0)
+			goto out_kfree_raw;
+
+		/* drop trailing space */
+		if (!(ret % 2))
+			count = ret - 1;
+		else
+			count = ret;
+
+		txbuf = kmalloc_array(count, sizeof(unsigned int), GFP_KERNEL);
+		if (!txbuf) {
+			ret = -ENOMEM;
+			goto out_kfree_raw;
+		}
+
+		for (i = 0; i < count; i++)
+			txbuf[i] = raw[i].duration;
+
+		if (dev->s_tx_carrier) {
+			int carrier = ir_raw_encode_carrier(scan.rc_proto);
+
+			if (carrier > 0)
+				dev->s_tx_carrier(dev, carrier);
+		}
+	} else {
+		if (n < sizeof(unsigned int) || n % sizeof(unsigned int)) {
+			ret = -EINVAL;
+			goto out_unlock;
+		}
+
+		count = n / sizeof(unsigned int);
+		if (count > LIRCBUF_SIZE || count % 2 == 0) {
+			ret = -EINVAL;
+			goto out_unlock;
+		}
+
+		txbuf = memdup_user(buf, n);
+		if (IS_ERR(txbuf)) {
+			ret = PTR_ERR(txbuf);
+			goto out_unlock;
+		}
+	}
+
+	for (i = 0; i < count; i++) {
+		if (txbuf[i] > IR_MAX_DURATION - duration || !txbuf[i]) {
+			ret = -EINVAL;
+			goto out_kfree;
+		}
+
+		duration += txbuf[i];
+	}
+
+	start = ktime_get();
+
+	ret = dev->tx_ir(dev, txbuf, count);
+	if (ret < 0)
+		goto out_kfree;
+
+	kfree(txbuf);
+	kfree(raw);
+	mutex_unlock(&dev->lock);
+
+	/*
+	 * The lircd gap calculation expects the write function to
+	 * wait for the actual IR signal to be transmitted before
+	 * returning.
+	 */
+	towait = ktime_us_delta(ktime_add_us(start, duration),
+				ktime_get());
+	if (towait > 0) {
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout(usecs_to_jiffies(towait));
+	}
+
+	return n;
+out_kfree:
+	kfree(txbuf);
+out_kfree_raw:
+	kfree(raw);
+out_unlock:
+	mutex_unlock(&dev->lock);
+	return ret;
+}
+
+static long lirc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct lirc_fh *fh = file->private_data;
+	struct rc_dev *dev = fh->rc;
+	u32 __user *argp = (u32 __user *)(arg);
+	u32 val = 0;
+	int ret;
+
+	if (_IOC_DIR(cmd) & _IOC_WRITE) {
+		ret = get_user(val, argp);
+		if (ret)
+			return ret;
+	}
+
+	ret = mutex_lock_interruptible(&dev->lock);
+	if (ret)
+		return ret;
+
+	if (!dev->registered) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	switch (cmd) {
+	case LIRC_GET_FEATURES:
+		if (dev->driver_type == RC_DRIVER_SCANCODE)
+			val |= LIRC_CAN_REC_SCANCODE;
+
+		if (dev->driver_type == RC_DRIVER_IR_RAW) {
+			val |= LIRC_CAN_REC_MODE2;
+			if (dev->rx_resolution)
+				val |= LIRC_CAN_GET_REC_RESOLUTION;
+		}
+
+		if (dev->tx_ir) {
+			val |= LIRC_CAN_SEND_PULSE;
+			if (dev->s_tx_mask)
+				val |= LIRC_CAN_SET_TRANSMITTER_MASK;
+			if (dev->s_tx_carrier)
+				val |= LIRC_CAN_SET_SEND_CARRIER;
+			if (dev->s_tx_duty_cycle)
+				val |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
+		}
+
+		if (dev->s_rx_carrier_range)
+			val |= LIRC_CAN_SET_REC_CARRIER |
+				LIRC_CAN_SET_REC_CARRIER_RANGE;
+
+		if (dev->s_wideband_receiver)
+			val |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
+
+		if (dev->s_carrier_report)
+			val |= LIRC_CAN_MEASURE_CARRIER;
+
+		if (dev->max_timeout)
+			val |= LIRC_CAN_SET_REC_TIMEOUT;
+
+		break;
+
+	/* mode support */
+	case LIRC_GET_REC_MODE:
+		if (dev->driver_type == RC_DRIVER_IR_RAW_TX)
+			ret = -ENOTTY;
+		else
+			val = fh->rec_mode;
+		break;
+
+	case LIRC_SET_REC_MODE:
+		switch (dev->driver_type) {
+		case RC_DRIVER_IR_RAW_TX:
+			ret = -ENOTTY;
+			break;
+		case RC_DRIVER_SCANCODE:
+			if (val != LIRC_MODE_SCANCODE)
+				ret = -EINVAL;
+			break;
+		case RC_DRIVER_IR_RAW:
+			if (!(val == LIRC_MODE_MODE2 ||
+			      val == LIRC_MODE_SCANCODE))
+				ret = -EINVAL;
+			break;
+		}
+
+		if (!ret)
+			fh->rec_mode = val;
+		break;
+
+	case LIRC_GET_SEND_MODE:
+		if (!dev->tx_ir)
+			ret = -ENOTTY;
+		else
+			val = fh->send_mode;
+		break;
+
+	case LIRC_SET_SEND_MODE:
+		if (!dev->tx_ir)
+			ret = -ENOTTY;
+		else if (!(val == LIRC_MODE_PULSE || val == LIRC_MODE_SCANCODE))
+			ret = -EINVAL;
+		else
+			fh->send_mode = val;
+		break;
+
+	/* TX settings */
+	case LIRC_SET_TRANSMITTER_MASK:
+		if (!dev->s_tx_mask)
+			ret = -ENOTTY;
+		else
+			ret = dev->s_tx_mask(dev, val);
+		break;
+
+	case LIRC_SET_SEND_CARRIER:
+		if (!dev->s_tx_carrier)
+			ret = -ENOTTY;
+		else
+			ret = dev->s_tx_carrier(dev, val);
+		break;
+
+	case LIRC_SET_SEND_DUTY_CYCLE:
+		if (!dev->s_tx_duty_cycle)
+			ret = -ENOTTY;
+		else if (val <= 0 || val >= 100)
+			ret = -EINVAL;
+		else
+			ret = dev->s_tx_duty_cycle(dev, val);
+		break;
+
+	/* RX settings */
+	case LIRC_SET_REC_CARRIER:
+		if (!dev->s_rx_carrier_range)
+			ret = -ENOTTY;
+		else if (val <= 0)
+			ret = -EINVAL;
+		else
+			ret = dev->s_rx_carrier_range(dev, fh->carrier_low,
+						      val);
+		break;
+
+	case LIRC_SET_REC_CARRIER_RANGE:
+		if (!dev->s_rx_carrier_range)
+			ret = -ENOTTY;
+		else if (val <= 0)
+			ret = -EINVAL;
+		else
+			fh->carrier_low = val;
+		break;
+
+	case LIRC_GET_REC_RESOLUTION:
+		if (!dev->rx_resolution)
+			ret = -ENOTTY;
+		else
+			val = dev->rx_resolution;
+		break;
+
+	case LIRC_SET_WIDEBAND_RECEIVER:
+		if (!dev->s_wideband_receiver)
+			ret = -ENOTTY;
+		else
+			ret = dev->s_wideband_receiver(dev, !!val);
+		break;
+
+	case LIRC_SET_MEASURE_CARRIER_MODE:
+		if (!dev->s_carrier_report)
+			ret = -ENOTTY;
+		else
+			ret = dev->s_carrier_report(dev, !!val);
+		break;
+
+	/* Generic timeout support */
+	case LIRC_GET_MIN_TIMEOUT:
+		if (!dev->max_timeout)
+			ret = -ENOTTY;
+		else
+			val = dev->min_timeout;
+		break;
+
+	case LIRC_GET_MAX_TIMEOUT:
+		if (!dev->max_timeout)
+			ret = -ENOTTY;
+		else
+			val = dev->max_timeout;
+		break;
+
+	case LIRC_SET_REC_TIMEOUT:
+		if (!dev->max_timeout) {
+			ret = -ENOTTY;
+		} else {
+			if (val < dev->min_timeout || val > dev->max_timeout)
+				ret = -EINVAL;
+			else if (dev->s_timeout)
+				ret = dev->s_timeout(dev, val);
+			else
+				dev->timeout = val;
+		}
+		break;
+
+	case LIRC_GET_REC_TIMEOUT:
+		if (!dev->timeout)
+			ret = -ENOTTY;
+		else
+			val = dev->timeout;
+		break;
+
+	case LIRC_SET_REC_TIMEOUT_REPORTS:
+		if (dev->driver_type != RC_DRIVER_IR_RAW)
+			ret = -ENOTTY;
+		break;
+
+	default:
+		ret = -ENOTTY;
+	}
+
+	if (!ret && _IOC_DIR(cmd) & _IOC_READ)
+		ret = put_user(val, argp);
+
+out:
+	mutex_unlock(&dev->lock);
+	return ret;
+}
+
+static __poll_t lirc_poll(struct file *file, struct poll_table_struct *wait)
+{
+	struct lirc_fh *fh = file->private_data;
+	struct rc_dev *rcdev = fh->rc;
+	__poll_t events = 0;
+
+	poll_wait(file, &fh->wait_poll, wait);
+
+	if (!rcdev->registered) {
+		events = EPOLLHUP | EPOLLERR;
+	} else if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX) {
+		if (fh->rec_mode == LIRC_MODE_SCANCODE &&
+		    !kfifo_is_empty(&fh->scancodes))
+			events = EPOLLIN | EPOLLRDNORM;
+
+		if (fh->rec_mode == LIRC_MODE_MODE2 &&
+		    !kfifo_is_empty(&fh->rawir))
+			events = EPOLLIN | EPOLLRDNORM;
+	}
+
+	return events;
+}
+
+static ssize_t lirc_read_mode2(struct file *file, char __user *buffer,
+			       size_t length)
+{
+	struct lirc_fh *fh = file->private_data;
+	struct rc_dev *rcdev = fh->rc;
+	unsigned int copied;
+	int ret;
+
+	if (length < sizeof(unsigned int) || length % sizeof(unsigned int))
+		return -EINVAL;
+
+	do {
+		if (kfifo_is_empty(&fh->rawir)) {
+			if (file->f_flags & O_NONBLOCK)
+				return -EAGAIN;
+
+			ret = wait_event_interruptible(fh->wait_poll,
+					!kfifo_is_empty(&fh->rawir) ||
+					!rcdev->registered);
+			if (ret)
+				return ret;
+		}
+
+		if (!rcdev->registered)
+			return -ENODEV;
+
+		ret = mutex_lock_interruptible(&rcdev->lock);
+		if (ret)
+			return ret;
+		ret = kfifo_to_user(&fh->rawir, buffer, length, &copied);
+		mutex_unlock(&rcdev->lock);
+		if (ret)
+			return ret;
+	} while (copied == 0);
+
+	return copied;
+}
+
+static ssize_t lirc_read_scancode(struct file *file, char __user *buffer,
+				  size_t length)
+{
+	struct lirc_fh *fh = file->private_data;
+	struct rc_dev *rcdev = fh->rc;
+	unsigned int copied;
+	int ret;
+
+	if (length < sizeof(struct lirc_scancode) ||
+	    length % sizeof(struct lirc_scancode))
+		return -EINVAL;
+
+	do {
+		if (kfifo_is_empty(&fh->scancodes)) {
+			if (file->f_flags & O_NONBLOCK)
+				return -EAGAIN;
+
+			ret = wait_event_interruptible(fh->wait_poll,
+					!kfifo_is_empty(&fh->scancodes) ||
+					!rcdev->registered);
+			if (ret)
+				return ret;
+		}
+
+		if (!rcdev->registered)
+			return -ENODEV;
+
+		ret = mutex_lock_interruptible(&rcdev->lock);
+		if (ret)
+			return ret;
+		ret = kfifo_to_user(&fh->scancodes, buffer, length, &copied);
+		mutex_unlock(&rcdev->lock);
+		if (ret)
+			return ret;
+	} while (copied == 0);
+
+	return copied;
+}
+
+static ssize_t lirc_read(struct file *file, char __user *buffer, size_t length,
+			 loff_t *ppos)
+{
+	struct lirc_fh *fh = file->private_data;
+	struct rc_dev *rcdev = fh->rc;
+
+	if (rcdev->driver_type == RC_DRIVER_IR_RAW_TX)
+		return -EINVAL;
+
+	if (!rcdev->registered)
+		return -ENODEV;
+
+	if (fh->rec_mode == LIRC_MODE_MODE2)
+		return lirc_read_mode2(file, buffer, length);
+	else /* LIRC_MODE_SCANCODE */
+		return lirc_read_scancode(file, buffer, length);
+}
+
+static const struct file_operations lirc_fops = {
+	.owner		= THIS_MODULE,
+	.write		= lirc_transmit,
+	.unlocked_ioctl	= lirc_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
+	.read		= lirc_read,
+	.poll		= lirc_poll,
+	.open		= lirc_open,
+	.release	= lirc_close,
+	.llseek		= no_llseek,
+};
+
+static void lirc_release_device(struct device *ld)
+{
+	struct rc_dev *rcdev = container_of(ld, struct rc_dev, lirc_dev);
+
+	put_device(&rcdev->dev);
+}
+
+int lirc_register(struct rc_dev *dev)
+{
+	const char *rx_type, *tx_type;
+	int err, minor;
+
+	minor = ida_alloc_max(&lirc_ida, RC_DEV_MAX - 1, GFP_KERNEL);
+	if (minor < 0)
+		return minor;
+
+	device_initialize(&dev->lirc_dev);
+	dev->lirc_dev.class = lirc_class;
+	dev->lirc_dev.parent = &dev->dev;
+	dev->lirc_dev.release = lirc_release_device;
+	dev->lirc_dev.devt = MKDEV(MAJOR(lirc_base_dev), minor);
+	dev_set_name(&dev->lirc_dev, "lirc%d", minor);
+
+	INIT_LIST_HEAD(&dev->lirc_fh);
+	spin_lock_init(&dev->lirc_fh_lock);
+
+	cdev_init(&dev->lirc_cdev, &lirc_fops);
+
+	err = cdev_device_add(&dev->lirc_cdev, &dev->lirc_dev);
+	if (err)
+		goto out_ida;
+
+	get_device(&dev->dev);
+
+	switch (dev->driver_type) {
+	case RC_DRIVER_SCANCODE:
+		rx_type = "scancode";
+		break;
+	case RC_DRIVER_IR_RAW:
+		rx_type = "raw IR";
+		break;
+	default:
+		rx_type = "no";
+		break;
+	}
+
+	if (dev->tx_ir)
+		tx_type = "raw IR";
+	else
+		tx_type = "no";
+
+	dev_info(&dev->dev, "lirc_dev: driver %s registered at minor = %d, %s receiver, %s transmitter",
+		 dev->driver_name, minor, rx_type, tx_type);
+
+	return 0;
+
+out_ida:
+	ida_free(&lirc_ida, minor);
+	return err;
+}
+
+void lirc_unregister(struct rc_dev *dev)
+{
+	unsigned long flags;
+	struct lirc_fh *fh;
+
+	dev_dbg(&dev->dev, "lirc_dev: driver %s unregistered from minor = %d\n",
+		dev->driver_name, MINOR(dev->lirc_dev.devt));
+
+	spin_lock_irqsave(&dev->lirc_fh_lock, flags);
+	list_for_each_entry(fh, &dev->lirc_fh, list)
+		wake_up_poll(&fh->wait_poll, EPOLLHUP | EPOLLERR);
+	spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
+
+	cdev_device_del(&dev->lirc_cdev, &dev->lirc_dev);
+	ida_free(&lirc_ida, MINOR(dev->lirc_dev.devt));
+}
+
+int __init lirc_dev_init(void)
+{
+	int retval;
+
+	lirc_class = class_create("lirc");
+	if (IS_ERR(lirc_class)) {
+		pr_err("class_create failed\n");
+		return PTR_ERR(lirc_class);
+	}
+
+	retval = alloc_chrdev_region(&lirc_base_dev, 0, RC_DEV_MAX, "lirc");
+	if (retval) {
+		class_destroy(lirc_class);
+		pr_err("alloc_chrdev_region failed\n");
+		return retval;
+	}
+
+	pr_debug("IR Remote Control driver registered, major %d\n",
+		 MAJOR(lirc_base_dev));
+
+	return 0;
+}
+
+void __exit lirc_dev_exit(void)
+{
+	class_destroy(lirc_class);
+	unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX);
+}
+
+struct rc_dev *rc_dev_get_from_fd(int fd)
+{
+	struct fd f = fdget(fd);
+	struct lirc_fh *fh;
+	struct rc_dev *dev;
+
+	if (!f.file)
+		return ERR_PTR(-EBADF);
+
+	if (f.file->f_op != &lirc_fops) {
+		fdput(f);
+		return ERR_PTR(-EINVAL);
+	}
+
+	fh = f.file->private_data;
+	dev = fh->rc;
+
+	get_device(&dev->dev);
+	fdput(f);
+
+	return dev;
+}
+
+MODULE_ALIAS("lirc_dev");