844 lines
18 KiB
C
844 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* LIRC base driver
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*
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* by Artur Lipowski <alipowski@interia.pl>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/file.h>
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#include <linux/idr.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include "rc-core-priv.h"
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#include <uapi/linux/lirc.h>
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#define LIRCBUF_SIZE 1024
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static dev_t lirc_base_dev;
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/* Used to keep track of allocated lirc devices */
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static DEFINE_IDA(lirc_ida);
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/* Only used for sysfs but defined to void otherwise */
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static struct class *lirc_class;
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/**
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* lirc_raw_event() - Send raw IR data to lirc to be relayed to userspace
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*
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* @dev: the struct rc_dev descriptor of the device
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* @ev: the struct ir_raw_event descriptor of the pulse/space
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*/
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void lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
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{
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unsigned long flags;
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struct lirc_fh *fh;
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int sample;
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/* Receiver overflow, data missing */
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if (ev.overflow) {
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/*
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* Send lirc overflow message. This message is unknown to
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* lircd, but it will interpret this as a long space as
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* long as the value is set to high value. This resets its
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* decoder state.
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*/
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sample = LIRC_OVERFLOW(LIRC_VALUE_MASK);
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dev_dbg(&dev->dev, "delivering overflow to lirc_dev\n");
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/* Carrier reports */
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} else if (ev.carrier_report) {
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sample = LIRC_FREQUENCY(ev.carrier);
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dev_dbg(&dev->dev, "carrier report (freq: %d)\n", sample);
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/* Packet end */
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} else if (ev.timeout) {
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dev->gap_start = ktime_get();
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sample = LIRC_TIMEOUT(ev.duration);
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dev_dbg(&dev->dev, "timeout report (duration: %d)\n", sample);
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/* Normal sample */
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} else {
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if (dev->gap_start) {
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u64 duration = ktime_us_delta(ktime_get(),
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dev->gap_start);
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/* Cap by LIRC_VALUE_MASK */
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duration = min_t(u64, duration, LIRC_VALUE_MASK);
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spin_lock_irqsave(&dev->lirc_fh_lock, flags);
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list_for_each_entry(fh, &dev->lirc_fh, list)
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kfifo_put(&fh->rawir, LIRC_SPACE(duration));
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spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
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dev->gap_start = 0;
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}
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sample = ev.pulse ? LIRC_PULSE(ev.duration) :
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LIRC_SPACE(ev.duration);
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dev_dbg(&dev->dev, "delivering %uus %s to lirc_dev\n",
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ev.duration, TO_STR(ev.pulse));
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}
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/*
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* bpf does not care about the gap generated above; that exists
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* for backwards compatibility
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*/
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lirc_bpf_run(dev, sample);
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spin_lock_irqsave(&dev->lirc_fh_lock, flags);
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list_for_each_entry(fh, &dev->lirc_fh, list) {
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if (kfifo_put(&fh->rawir, sample))
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wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM);
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}
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spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
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}
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/**
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* lirc_scancode_event() - Send scancode data to lirc to be relayed to
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* userspace. This can be called in atomic context.
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* @dev: the struct rc_dev descriptor of the device
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* @lsc: the struct lirc_scancode describing the decoded scancode
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*/
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void lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc)
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{
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unsigned long flags;
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struct lirc_fh *fh;
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lsc->timestamp = ktime_get_ns();
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spin_lock_irqsave(&dev->lirc_fh_lock, flags);
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list_for_each_entry(fh, &dev->lirc_fh, list) {
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if (kfifo_put(&fh->scancodes, *lsc))
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wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM);
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}
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spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
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}
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EXPORT_SYMBOL_GPL(lirc_scancode_event);
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static int lirc_open(struct inode *inode, struct file *file)
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{
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struct rc_dev *dev = container_of(inode->i_cdev, struct rc_dev,
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lirc_cdev);
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struct lirc_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
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unsigned long flags;
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int retval;
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if (!fh)
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return -ENOMEM;
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get_device(&dev->dev);
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if (!dev->registered) {
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retval = -ENODEV;
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goto out_fh;
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}
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if (dev->driver_type == RC_DRIVER_IR_RAW) {
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if (kfifo_alloc(&fh->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL)) {
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retval = -ENOMEM;
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goto out_fh;
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}
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}
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if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
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if (kfifo_alloc(&fh->scancodes, 32, GFP_KERNEL)) {
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retval = -ENOMEM;
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goto out_rawir;
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}
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}
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fh->send_mode = LIRC_MODE_PULSE;
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fh->rc = dev;
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if (dev->driver_type == RC_DRIVER_SCANCODE)
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fh->rec_mode = LIRC_MODE_SCANCODE;
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else
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fh->rec_mode = LIRC_MODE_MODE2;
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retval = rc_open(dev);
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if (retval)
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goto out_kfifo;
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init_waitqueue_head(&fh->wait_poll);
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file->private_data = fh;
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spin_lock_irqsave(&dev->lirc_fh_lock, flags);
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list_add(&fh->list, &dev->lirc_fh);
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spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
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stream_open(inode, file);
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return 0;
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out_kfifo:
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if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
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kfifo_free(&fh->scancodes);
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out_rawir:
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if (dev->driver_type == RC_DRIVER_IR_RAW)
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kfifo_free(&fh->rawir);
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out_fh:
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kfree(fh);
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put_device(&dev->dev);
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return retval;
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}
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static int lirc_close(struct inode *inode, struct file *file)
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{
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struct lirc_fh *fh = file->private_data;
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struct rc_dev *dev = fh->rc;
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unsigned long flags;
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spin_lock_irqsave(&dev->lirc_fh_lock, flags);
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list_del(&fh->list);
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spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
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if (dev->driver_type == RC_DRIVER_IR_RAW)
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kfifo_free(&fh->rawir);
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if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
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kfifo_free(&fh->scancodes);
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kfree(fh);
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rc_close(dev);
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put_device(&dev->dev);
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return 0;
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}
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static ssize_t lirc_transmit(struct file *file, const char __user *buf,
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size_t n, loff_t *ppos)
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{
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struct lirc_fh *fh = file->private_data;
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struct rc_dev *dev = fh->rc;
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unsigned int *txbuf;
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struct ir_raw_event *raw = NULL;
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ssize_t ret;
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size_t count;
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ktime_t start;
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s64 towait;
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unsigned int duration = 0; /* signal duration in us */
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int i;
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ret = mutex_lock_interruptible(&dev->lock);
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if (ret)
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return ret;
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if (!dev->registered) {
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ret = -ENODEV;
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goto out_unlock;
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}
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if (!dev->tx_ir) {
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ret = -EINVAL;
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goto out_unlock;
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}
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if (fh->send_mode == LIRC_MODE_SCANCODE) {
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struct lirc_scancode scan;
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if (n != sizeof(scan)) {
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ret = -EINVAL;
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goto out_unlock;
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}
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if (copy_from_user(&scan, buf, sizeof(scan))) {
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ret = -EFAULT;
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goto out_unlock;
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}
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if (scan.flags || scan.keycode || scan.timestamp ||
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scan.rc_proto > RC_PROTO_MAX) {
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ret = -EINVAL;
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goto out_unlock;
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}
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/* We only have encoders for 32-bit protocols. */
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if (scan.scancode > U32_MAX ||
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!rc_validate_scancode(scan.rc_proto, scan.scancode)) {
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ret = -EINVAL;
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goto out_unlock;
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}
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raw = kmalloc_array(LIRCBUF_SIZE, sizeof(*raw), GFP_KERNEL);
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if (!raw) {
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ret = -ENOMEM;
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goto out_unlock;
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}
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ret = ir_raw_encode_scancode(scan.rc_proto, scan.scancode,
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raw, LIRCBUF_SIZE);
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if (ret < 0)
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goto out_kfree_raw;
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/* drop trailing space */
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if (!(ret % 2))
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count = ret - 1;
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else
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count = ret;
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txbuf = kmalloc_array(count, sizeof(unsigned int), GFP_KERNEL);
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if (!txbuf) {
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ret = -ENOMEM;
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goto out_kfree_raw;
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}
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for (i = 0; i < count; i++)
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txbuf[i] = raw[i].duration;
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if (dev->s_tx_carrier) {
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int carrier = ir_raw_encode_carrier(scan.rc_proto);
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if (carrier > 0)
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dev->s_tx_carrier(dev, carrier);
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}
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} else {
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if (n < sizeof(unsigned int) || n % sizeof(unsigned int)) {
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ret = -EINVAL;
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goto out_unlock;
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}
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count = n / sizeof(unsigned int);
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if (count > LIRCBUF_SIZE || count % 2 == 0) {
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ret = -EINVAL;
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goto out_unlock;
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}
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txbuf = memdup_user(buf, n);
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if (IS_ERR(txbuf)) {
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ret = PTR_ERR(txbuf);
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goto out_unlock;
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}
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}
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for (i = 0; i < count; i++) {
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if (txbuf[i] > IR_MAX_DURATION - duration || !txbuf[i]) {
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ret = -EINVAL;
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goto out_kfree;
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}
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duration += txbuf[i];
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}
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start = ktime_get();
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ret = dev->tx_ir(dev, txbuf, count);
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if (ret < 0)
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goto out_kfree;
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kfree(txbuf);
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kfree(raw);
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mutex_unlock(&dev->lock);
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/*
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* The lircd gap calculation expects the write function to
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* wait for the actual IR signal to be transmitted before
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* returning.
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*/
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towait = ktime_us_delta(ktime_add_us(start, duration),
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ktime_get());
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if (towait > 0) {
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set_current_state(TASK_INTERRUPTIBLE);
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schedule_timeout(usecs_to_jiffies(towait));
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}
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return n;
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out_kfree:
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kfree(txbuf);
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out_kfree_raw:
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kfree(raw);
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out_unlock:
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mutex_unlock(&dev->lock);
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return ret;
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}
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static long lirc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct lirc_fh *fh = file->private_data;
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struct rc_dev *dev = fh->rc;
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u32 __user *argp = (u32 __user *)(arg);
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u32 val = 0;
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int ret;
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if (_IOC_DIR(cmd) & _IOC_WRITE) {
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ret = get_user(val, argp);
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if (ret)
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return ret;
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}
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ret = mutex_lock_interruptible(&dev->lock);
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if (ret)
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return ret;
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if (!dev->registered) {
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ret = -ENODEV;
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goto out;
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}
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switch (cmd) {
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case LIRC_GET_FEATURES:
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if (dev->driver_type == RC_DRIVER_SCANCODE)
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val |= LIRC_CAN_REC_SCANCODE;
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if (dev->driver_type == RC_DRIVER_IR_RAW) {
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val |= LIRC_CAN_REC_MODE2;
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if (dev->rx_resolution)
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val |= LIRC_CAN_GET_REC_RESOLUTION;
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}
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if (dev->tx_ir) {
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val |= LIRC_CAN_SEND_PULSE;
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if (dev->s_tx_mask)
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val |= LIRC_CAN_SET_TRANSMITTER_MASK;
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if (dev->s_tx_carrier)
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val |= LIRC_CAN_SET_SEND_CARRIER;
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if (dev->s_tx_duty_cycle)
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val |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
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}
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if (dev->s_rx_carrier_range)
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val |= LIRC_CAN_SET_REC_CARRIER |
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LIRC_CAN_SET_REC_CARRIER_RANGE;
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if (dev->s_wideband_receiver)
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val |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
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if (dev->s_carrier_report)
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val |= LIRC_CAN_MEASURE_CARRIER;
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if (dev->max_timeout)
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val |= LIRC_CAN_SET_REC_TIMEOUT;
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break;
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/* mode support */
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case LIRC_GET_REC_MODE:
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if (dev->driver_type == RC_DRIVER_IR_RAW_TX)
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ret = -ENOTTY;
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else
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val = fh->rec_mode;
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break;
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case LIRC_SET_REC_MODE:
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switch (dev->driver_type) {
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case RC_DRIVER_IR_RAW_TX:
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ret = -ENOTTY;
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break;
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case RC_DRIVER_SCANCODE:
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if (val != LIRC_MODE_SCANCODE)
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ret = -EINVAL;
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break;
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case RC_DRIVER_IR_RAW:
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if (!(val == LIRC_MODE_MODE2 ||
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val == LIRC_MODE_SCANCODE))
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ret = -EINVAL;
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break;
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}
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if (!ret)
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fh->rec_mode = val;
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break;
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case LIRC_GET_SEND_MODE:
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if (!dev->tx_ir)
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ret = -ENOTTY;
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else
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val = fh->send_mode;
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break;
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case LIRC_SET_SEND_MODE:
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if (!dev->tx_ir)
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ret = -ENOTTY;
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else if (!(val == LIRC_MODE_PULSE || val == LIRC_MODE_SCANCODE))
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ret = -EINVAL;
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else
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fh->send_mode = val;
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break;
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|
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/* TX settings */
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case LIRC_SET_TRANSMITTER_MASK:
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if (!dev->s_tx_mask)
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ret = -ENOTTY;
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else
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ret = dev->s_tx_mask(dev, val);
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break;
|
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|
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case LIRC_SET_SEND_CARRIER:
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if (!dev->s_tx_carrier)
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ret = -ENOTTY;
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else
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ret = dev->s_tx_carrier(dev, val);
|
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break;
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|
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case LIRC_SET_SEND_DUTY_CYCLE:
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if (!dev->s_tx_duty_cycle)
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ret = -ENOTTY;
|
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else if (val <= 0 || val >= 100)
|
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ret = -EINVAL;
|
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else
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ret = dev->s_tx_duty_cycle(dev, val);
|
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break;
|
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|
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/* RX settings */
|
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case LIRC_SET_REC_CARRIER:
|
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if (!dev->s_rx_carrier_range)
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ret = -ENOTTY;
|
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else if (val <= 0)
|
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ret = -EINVAL;
|
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else
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ret = dev->s_rx_carrier_range(dev, fh->carrier_low,
|
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val);
|
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break;
|
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|
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case LIRC_SET_REC_CARRIER_RANGE:
|
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if (!dev->s_rx_carrier_range)
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ret = -ENOTTY;
|
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else if (val <= 0)
|
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ret = -EINVAL;
|
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else
|
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fh->carrier_low = val;
|
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break;
|
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|
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case LIRC_GET_REC_RESOLUTION:
|
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if (!dev->rx_resolution)
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ret = -ENOTTY;
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else
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val = dev->rx_resolution;
|
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break;
|
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|
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case LIRC_SET_WIDEBAND_RECEIVER:
|
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if (!dev->s_wideband_receiver)
|
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ret = -ENOTTY;
|
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else
|
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ret = dev->s_wideband_receiver(dev, !!val);
|
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break;
|
|
|
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case LIRC_SET_MEASURE_CARRIER_MODE:
|
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if (!dev->s_carrier_report)
|
|
ret = -ENOTTY;
|
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else
|
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ret = dev->s_carrier_report(dev, !!val);
|
|
break;
|
|
|
|
/* Generic timeout support */
|
|
case LIRC_GET_MIN_TIMEOUT:
|
|
if (!dev->max_timeout)
|
|
ret = -ENOTTY;
|
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else
|
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val = dev->min_timeout;
|
|
break;
|
|
|
|
case LIRC_GET_MAX_TIMEOUT:
|
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if (!dev->max_timeout)
|
|
ret = -ENOTTY;
|
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else
|
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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(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, "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, bool write)
|
|
{
|
|
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);
|
|
}
|
|
|
|
if (write && !(f.file->f_mode & FMODE_WRITE))
|
|
return ERR_PTR(-EPERM);
|
|
|
|
fh = f.file->private_data;
|
|
dev = fh->rc;
|
|
|
|
get_device(&dev->dev);
|
|
fdput(f);
|
|
|
|
return dev;
|
|
}
|
|
|
|
MODULE_ALIAS("lirc_dev");
|