--- /dev/null
+/* ir-lirc-codec.c - rc-core to classic lirc interface bridge
+ *
+ * Copyright (C) 2010 by Jarod Wilson <jarod@redhat.com>
+ *
+ * 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 version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/module.h>
+#include <media/lirc.h>
+#include <media/lirc_dev.h>
+#include <media/rc-core.h>
+#include "rc-core-priv.h"
+
+#define LIRCBUF_SIZE 256
+
+/**
+ * ir_lirc_decode() - Send raw IR data to lirc_dev to be relayed to the
+ * lircd userspace daemon for decoding.
+ * @input_dev: the struct rc_dev descriptor of the device
+ * @duration: the struct ir_raw_event descriptor of the pulse/space
+ *
+ * This function returns -EINVAL if the lirc interfaces aren't wired up.
+ */
+static int ir_lirc_decode(struct rc_dev *dev, struct ir_raw_event ev)
+{
+ struct lirc_codec *lirc = &dev->raw->lirc;
+ int sample;
+
+ if (!(dev->enabled_protocols & RC_BIT_LIRC))
+ return 0;
+
+ if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf)
+ return -EINVAL;
+
+ /* 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);
+ IR_dprintk(2, "delivering reset sync space to lirc_dev\n");
+
+ /* Carrier reports */
+ } else if (ev.carrier_report) {
+ sample = LIRC_FREQUENCY(ev.carrier);
+ IR_dprintk(2, "carrier report (freq: %d)\n", sample);
+
+ /* Packet end */
+ } else if (ev.timeout) {
+
+ if (lirc->gap)
+ return 0;
+
+ lirc->gap_start = ktime_get();
+ lirc->gap = true;
+ lirc->gap_duration = ev.duration;
+
+ if (!lirc->send_timeout_reports)
+ return 0;
+
+ sample = LIRC_TIMEOUT(ev.duration / 1000);
+ IR_dprintk(2, "timeout report (duration: %d)\n", sample);
+
+ /* Normal sample */
+ } else {
+
+ if (lirc->gap) {
+ int gap_sample;
+
+ lirc->gap_duration += ktime_to_ns(ktime_sub(ktime_get(),
+ lirc->gap_start));
+
+ /* Convert to ms and cap by LIRC_VALUE_MASK */
+ do_div(lirc->gap_duration, 1000);
+ lirc->gap_duration = min(lirc->gap_duration,
+ (u64)LIRC_VALUE_MASK);
+
+ gap_sample = LIRC_SPACE(lirc->gap_duration);
+ lirc_buffer_write(dev->raw->lirc.drv->rbuf,
+ (unsigned char *) &gap_sample);
+ lirc->gap = false;
+ }
+
+ sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) :
+ LIRC_SPACE(ev.duration / 1000);
+ IR_dprintk(2, "delivering %uus %s to lirc_dev\n",
+ TO_US(ev.duration), TO_STR(ev.pulse));
+ }
+
+ lirc_buffer_write(dev->raw->lirc.drv->rbuf,
+ (unsigned char *) &sample);
+ wake_up(&dev->raw->lirc.drv->rbuf->wait_poll);
+
+ return 0;
+}
+
+static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
+ size_t n, loff_t *ppos)
+{
+ struct lirc_codec *lirc;
+ struct rc_dev *dev;
+ unsigned int *txbuf; /* buffer with values to transmit */
+ ssize_t ret = -EINVAL;
+ size_t count;
+ ktime_t start;
+ s64 towait;
+ unsigned int duration = 0; /* signal duration in us */
+ int i;
+
+ start = ktime_get();
+
+ lirc = lirc_get_pdata(file);
+ if (!lirc)
+ return -EFAULT;
+
+ if (n < sizeof(unsigned) || n % sizeof(unsigned))
+ return -EINVAL;
+
+ count = n / sizeof(unsigned);
+ if (count > LIRCBUF_SIZE || count % 2 == 0)
+ return -EINVAL;
+
+ txbuf = memdup_user(buf, n);
+ if (IS_ERR(txbuf))
+ return PTR_ERR(txbuf);
+
+ dev = lirc->dev;
+ if (!dev) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ if (!dev->tx_ir) {
+ ret = -ENOSYS;
+ goto out;
+ }
+
+ for (i = 0; i < count; i++) {
+ if (txbuf[i] > IR_MAX_DURATION / 1000 - duration || !txbuf[i]) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ duration += txbuf[i];
+ }
+
+ ret = dev->tx_ir(dev, txbuf, count);
+ if (ret < 0)
+ goto out;
+
+ for (duration = i = 0; i < ret; i++)
+ duration += txbuf[i];
+
+ ret *= sizeof(unsigned int);
+
+ /*
+ * 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));
+ }
+
+out:
+ kfree(txbuf);
+ return ret;
+}
+
+static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
+ unsigned long arg)
+{
+ struct lirc_codec *lirc;
+ struct rc_dev *dev;
+ u32 __user *argp = (u32 __user *)(arg);
+ int ret = 0;
+ __u32 val = 0, tmp;
+
+ lirc = lirc_get_pdata(filep);
+ if (!lirc)
+ return -EFAULT;
+
+ dev = lirc->dev;
+ if (!dev)
+ return -EFAULT;
+
+ if (_IOC_DIR(cmd) & _IOC_WRITE) {
+ ret = get_user(val, argp);
+ if (ret)
+ return ret;
+ }
+
+ switch (cmd) {
+
+ /* legacy support */
+ case LIRC_GET_SEND_MODE:
+ val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
+ break;
+
+ case LIRC_SET_SEND_MODE:
+ if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
+ return -EINVAL;
+ return 0;
+
+ /* TX settings */
+ case LIRC_SET_TRANSMITTER_MASK:
+ if (!dev->s_tx_mask)
+ return -ENOSYS;
+
+ return dev->s_tx_mask(dev, val);
+
+ case LIRC_SET_SEND_CARRIER:
+ if (!dev->s_tx_carrier)
+ return -ENOSYS;
+
+ return dev->s_tx_carrier(dev, val);
+
+ case LIRC_SET_SEND_DUTY_CYCLE:
+ if (!dev->s_tx_duty_cycle)
+ return -ENOSYS;
+
+ if (val <= 0 || val >= 100)
+ return -EINVAL;
+
+ return dev->s_tx_duty_cycle(dev, val);
+
+ /* RX settings */
+ case LIRC_SET_REC_CARRIER:
+ if (!dev->s_rx_carrier_range)
+ return -ENOSYS;
+
+ if (val <= 0)
+ return -EINVAL;
+
+ return dev->s_rx_carrier_range(dev,
+ dev->raw->lirc.carrier_low,
+ val);
+
+ case LIRC_SET_REC_CARRIER_RANGE:
+ if (val <= 0)
+ return -EINVAL;
+
+ dev->raw->lirc.carrier_low = val;
+ return 0;
+
+ case LIRC_GET_REC_RESOLUTION:
+ val = dev->rx_resolution;
+ break;
+
+ case LIRC_SET_WIDEBAND_RECEIVER:
+ if (!dev->s_learning_mode)
+ return -ENOSYS;
+
+ return dev->s_learning_mode(dev, !!val);
+
+ case LIRC_SET_MEASURE_CARRIER_MODE:
+ if (!dev->s_carrier_report)
+ return -ENOSYS;
+
+ return dev->s_carrier_report(dev, !!val);
+
+ /* Generic timeout support */
+ case LIRC_GET_MIN_TIMEOUT:
+ if (!dev->max_timeout)
+ return -ENOSYS;
+ val = dev->min_timeout / 1000;
+ break;
+
+ case LIRC_GET_MAX_TIMEOUT:
+ if (!dev->max_timeout)
+ return -ENOSYS;
+ val = dev->max_timeout / 1000;
+ break;
+
+ case LIRC_SET_REC_TIMEOUT:
+ if (!dev->max_timeout)
+ return -ENOSYS;
+
+ tmp = val * 1000;
+
+ if (tmp < dev->min_timeout ||
+ tmp > dev->max_timeout)
+ return -EINVAL;
+
+ dev->timeout = tmp;
+ break;
+
+ case LIRC_SET_REC_TIMEOUT_REPORTS:
+ lirc->send_timeout_reports = !!val;
+ break;
+
+ default:
+ return lirc_dev_fop_ioctl(filep, cmd, arg);
+ }
+
+ if (_IOC_DIR(cmd) & _IOC_READ)
+ ret = put_user(val, argp);
+
+ return ret;
+}
+
+static int ir_lirc_open(void *data)
+{
+ return 0;
+}
+
+static void ir_lirc_close(void *data)
+{
+ return;
+}
+
+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 = lirc_dev_fop_read,
+ .poll = lirc_dev_fop_poll,
+ .open = lirc_dev_fop_open,
+ .release = lirc_dev_fop_close,
+ .llseek = no_llseek,
+};
+
+static int ir_lirc_register(struct rc_dev *dev)
+{
+ struct lirc_driver *drv;
+ struct lirc_buffer *rbuf;
+ int rc = -ENOMEM;
+ unsigned long features;
+
+ drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
+ if (!drv)
+ return rc;
+
+ rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
+ if (!rbuf)
+ goto rbuf_alloc_failed;
+
+ rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
+ if (rc)
+ goto rbuf_init_failed;
+
+ features = LIRC_CAN_REC_MODE2;
+ if (dev->tx_ir) {
+ features |= LIRC_CAN_SEND_PULSE;
+ if (dev->s_tx_mask)
+ features |= LIRC_CAN_SET_TRANSMITTER_MASK;
+ if (dev->s_tx_carrier)
+ features |= LIRC_CAN_SET_SEND_CARRIER;
+ if (dev->s_tx_duty_cycle)
+ features |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
+ }
+
+ if (dev->s_rx_carrier_range)
+ features |= LIRC_CAN_SET_REC_CARRIER |
+ LIRC_CAN_SET_REC_CARRIER_RANGE;
+
+ if (dev->s_learning_mode)
+ features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
+
+ if (dev->s_carrier_report)
+ features |= LIRC_CAN_MEASURE_CARRIER;
+
+ if (dev->max_timeout)
+ features |= LIRC_CAN_SET_REC_TIMEOUT;
+
+ snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
+ dev->driver_name);
+ drv->minor = -1;
+ drv->features = features;
+ drv->data = &dev->raw->lirc;
+ drv->rbuf = rbuf;
+ drv->set_use_inc = &ir_lirc_open;
+ drv->set_use_dec = &ir_lirc_close;
+ drv->code_length = sizeof(struct ir_raw_event) * 8;
+ drv->fops = &lirc_fops;
+ drv->dev = &dev->dev;
+ drv->rdev = dev;
+ drv->owner = THIS_MODULE;
+
+ drv->minor = lirc_register_driver(drv);
+ if (drv->minor < 0) {
+ rc = -ENODEV;
+ goto lirc_register_failed;
+ }
+
+ dev->raw->lirc.drv = drv;
+ dev->raw->lirc.dev = dev;
+ return 0;
+
+lirc_register_failed:
+rbuf_init_failed:
+ kfree(rbuf);
+rbuf_alloc_failed:
+ kfree(drv);
+
+ return rc;
+}
+
+static int ir_lirc_unregister(struct rc_dev *dev)
+{
+ struct lirc_codec *lirc = &dev->raw->lirc;
+
+ lirc_unregister_driver(lirc->drv->minor);
+ lirc_buffer_free(lirc->drv->rbuf);
+ kfree(lirc->drv);
+
+ return 0;
+}
+
+static struct ir_raw_handler lirc_handler = {
+ .protocols = RC_BIT_LIRC,
+ .decode = ir_lirc_decode,
+ .raw_register = ir_lirc_register,
+ .raw_unregister = ir_lirc_unregister,
+};
+
+static int __init ir_lirc_codec_init(void)
+{
+ ir_raw_handler_register(&lirc_handler);
+
+ printk(KERN_INFO "IR LIRC bridge handler initialized\n");
+ return 0;
+}
+
+static void __exit ir_lirc_codec_exit(void)
+{
+ ir_raw_handler_unregister(&lirc_handler);
+}
+
+module_init(ir_lirc_codec_init);
+module_exit(ir_lirc_codec_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
+MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
+MODULE_DESCRIPTION("LIRC IR handler bridge");
Code Review / kvmfornfv.git / blobdiff