v4.19.13 snapshot.
diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
new file mode 100644
index 0000000..f862f1b
--- /dev/null
+++ b/drivers/media/rc/lirc_dev.c
@@ -0,0 +1,874 @@
+/*
+ * LIRC base driver
+ *
+ * by Artur Lipowski <alipowski@interia.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#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 256
+
+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;
+
+/**
+ * ir_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 ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
+{
+ unsigned long flags;
+ struct lirc_fh *fh;
+ int sample;
+
+ /* Packet start */
+ if (ev.reset) {
+ /*
+ * Userspace expects a long space event before the start of
+ * the signal to use as a sync. This may be done with repeat
+ * packets and normal samples. But if a reset has been sent
+ * then we assume that a long time has passed, so we send a
+ * space with the maximum time value.
+ */
+ sample = LIRC_SPACE(LIRC_VALUE_MASK);
+ dev_dbg(&dev->dev, "delivering reset sync space 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) {
+ if (dev->gap)
+ return;
+
+ dev->gap_start = ktime_get();
+ dev->gap = true;
+ dev->gap_duration = ev.duration;
+
+ sample = LIRC_TIMEOUT(ev.duration / 1000);
+ dev_dbg(&dev->dev, "timeout report (duration: %d)\n", sample);
+
+ /* Normal sample */
+ } else {
+ if (dev->gap) {
+ dev->gap_duration += ktime_to_ns(ktime_sub(ktime_get(),
+ dev->gap_start));
+
+ /* Convert to ms and cap by LIRC_VALUE_MASK */
+ do_div(dev->gap_duration, 1000);
+ dev->gap_duration = min_t(u64, dev->gap_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(dev->gap_duration));
+ spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
+ dev->gap = false;
+ }
+
+ sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) :
+ LIRC_SPACE(ev.duration / 1000);
+ dev_dbg(&dev->dev, "delivering %uus %s to lirc_dev\n",
+ TO_US(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 (LIRC_IS_TIMEOUT(sample) && !fh->send_timeout_reports)
+ continue;
+ if (kfifo_put(&fh->rawir, sample))
+ wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM);
+ }
+ spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
+}
+
+/**
+ * ir_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 ir_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(ir_lirc_scancode_event);
+
+static int ir_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;
+ fh->send_timeout_reports = true;
+
+ 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);
+
+ nonseekable_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 ir_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 ir_lirc_transmit_ir(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) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ /*
+ * The scancode field in lirc_scancode is 64-bit simply
+ * to future-proof it, since there are IR protocols encode
+ * use more than 32 bits. For now only 32-bit protocols
+ * are supported.
+ */
+ 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;
+
+ 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++)
+ /* Convert from NS to US */
+ txbuf[i] = DIV_ROUND_UP(raw[i].duration, 1000);
+
+ 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 / 1000 - 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 ir_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_learning_mode)
+ 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 / 1000;
+ break;
+
+ case LIRC_SET_WIDEBAND_RECEIVER:
+ if (!dev->s_learning_mode)
+ ret = -ENOTTY;
+ else
+ ret = dev->s_learning_mode(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 = DIV_ROUND_UP(dev->min_timeout, 1000);
+ break;
+
+ case LIRC_GET_MAX_TIMEOUT:
+ if (!dev->max_timeout)
+ ret = -ENOTTY;
+ else
+ val = dev->max_timeout / 1000;
+ break;
+
+ case LIRC_SET_REC_TIMEOUT:
+ if (!dev->max_timeout) {
+ ret = -ENOTTY;
+ } else if (val > U32_MAX / 1000) {
+ /* Check for multiply overflow */
+ ret = -EINVAL;
+ } else {
+ u32 tmp = val * 1000;
+
+ if (tmp < dev->min_timeout || tmp > dev->max_timeout)
+ ret = -EINVAL;
+ else if (dev->s_timeout)
+ ret = dev->s_timeout(dev, tmp);
+ else
+ dev->timeout = tmp;
+ }
+ break;
+
+ case LIRC_GET_REC_TIMEOUT:
+ if (!dev->timeout)
+ ret = -ENOTTY;
+ else
+ val = DIV_ROUND_UP(dev->timeout, 1000);
+ break;
+
+ case LIRC_SET_REC_TIMEOUT_REPORTS:
+ if (dev->driver_type != RC_DRIVER_IR_RAW)
+ ret = -ENOTTY;
+ else
+ fh->send_timeout_reports = !!val;
+ 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 ir_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 ir_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 ir_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 ir_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 ir_lirc_read_mode2(file, buffer, length);
+ else /* LIRC_MODE_SCANCODE */
+ return ir_lirc_read_scancode(file, buffer, length);
+}
+
+static const struct file_operations lirc_fops = {
+ .owner = THIS_MODULE,
+ .write = ir_lirc_transmit_ir,
+ .unlocked_ioctl = ir_lirc_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = ir_lirc_ioctl,
+#endif
+ .read = ir_lirc_read,
+ .poll = ir_lirc_poll,
+ .open = ir_lirc_open,
+ .release = ir_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 ir_lirc_register(struct rc_dev *dev)
+{
+ const char *rx_type, *tx_type;
+ int err, minor;
+
+ minor = ida_simple_get(&lirc_ida, 0, RC_DEV_MAX, 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_simple_remove(&lirc_ida, minor);
+ return err;
+}
+
+void ir_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_simple_remove(&lirc_ida, MINOR(dev->lirc_dev.devt));
+}
+
+int __init lirc_dev_init(void)
+{
+ int retval;
+
+ lirc_class = class_create(THIS_MODULE, "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,
+ "BaseRemoteCtl");
+ 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");