1 files changed, 446 insertions, 0 deletions
diff --git a/drivers/media/rc/ir-lirc-codec.c b/drivers/media/rc/ir-lirc-codec.c
new file mode 100644
index 00000000000..d731da6c414
--- /dev/null
+++ b/drivers/media/rc/ir-lirc-codec.c
@@ -0,0 +1,446 @@
+/* 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 (!rc_protocols_enabled(dev, RC_BIT_LIRC))
+		return 0;
+
+	if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf)
+		return -EINVAL;
+
+	/* Packet start */
+	if (ev.reset)
+		return 0;
+
+	/* Carrier reports */
+	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");