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path: root/drivers/media/rc/rc-loopback.c
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Diffstat (limited to 'drivers/media/rc/rc-loopback.c')
-rw-r--r--drivers/media/rc/rc-loopback.c260
1 files changed, 260 insertions, 0 deletions
diff --git a/drivers/media/rc/rc-loopback.c b/drivers/media/rc/rc-loopback.c
new file mode 100644
index 0000000..49cee61
--- /dev/null
+++ b/drivers/media/rc/rc-loopback.c
@@ -0,0 +1,260 @@
+/*
+ * Loopback driver for rc-core,
+ *
+ * Copyright (c) 2010 David Härdeman <david@hardeman.nu>
+ *
+ * This driver receives TX data and passes it back as RX data,
+ * which is useful for (scripted) debugging of rc-core without
+ * having to use actual hardware.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <media/rc-core.h>
+
+#define DRIVER_NAME "rc-loopback"
+#define dprintk(x...) if (debug) printk(KERN_INFO DRIVER_NAME ": " x)
+#define RXMASK_REGULAR 0x1
+#define RXMASK_LEARNING 0x2
+
+static bool debug;
+
+struct loopback_dev {
+ struct rc_dev *dev;
+ u32 txmask;
+ u32 txcarrier;
+ u32 txduty;
+ bool idle;
+ bool learning;
+ bool carrierreport;
+ u32 rxcarriermin;
+ u32 rxcarriermax;
+};
+
+static struct loopback_dev loopdev;
+
+static int loop_set_tx_mask(struct rc_dev *dev, u32 mask)
+{
+ struct loopback_dev *lodev = dev->priv;
+
+ if ((mask & (RXMASK_REGULAR | RXMASK_LEARNING)) != mask) {
+ dprintk("invalid tx mask: %u\n", mask);
+ return -EINVAL;
+ }
+
+ dprintk("setting tx mask: %u\n", mask);
+ lodev->txmask = mask;
+ return 0;
+}
+
+static int loop_set_tx_carrier(struct rc_dev *dev, u32 carrier)
+{
+ struct loopback_dev *lodev = dev->priv;
+
+ dprintk("setting tx carrier: %u\n", carrier);
+ lodev->txcarrier = carrier;
+ return 0;
+}
+
+static int loop_set_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
+{
+ struct loopback_dev *lodev = dev->priv;
+
+ if (duty_cycle < 1 || duty_cycle > 99) {
+ dprintk("invalid duty cycle: %u\n", duty_cycle);
+ return -EINVAL;
+ }
+
+ dprintk("setting duty cycle: %u\n", duty_cycle);
+ lodev->txduty = duty_cycle;
+ return 0;
+}
+
+static int loop_set_rx_carrier_range(struct rc_dev *dev, u32 min, u32 max)
+{
+ struct loopback_dev *lodev = dev->priv;
+
+ if (min < 1 || min > max) {
+ dprintk("invalid rx carrier range %u to %u\n", min, max);
+ return -EINVAL;
+ }
+
+ dprintk("setting rx carrier range %u to %u\n", min, max);
+ lodev->rxcarriermin = min;
+ lodev->rxcarriermax = max;
+ return 0;
+}
+
+static int loop_tx_ir(struct rc_dev *dev, int *txbuf, u32 n)
+{
+ struct loopback_dev *lodev = dev->priv;
+ u32 rxmask;
+ unsigned count;
+ unsigned total_duration = 0;
+ unsigned i;
+ DEFINE_IR_RAW_EVENT(rawir);
+
+ if (n == 0 || n % sizeof(int)) {
+ dprintk("invalid tx buffer size\n");
+ return -EINVAL;
+ }
+
+ count = n / sizeof(int);
+ for (i = 0; i < count; i++)
+ total_duration += abs(txbuf[i]);
+
+ if (total_duration == 0) {
+ dprintk("invalid tx data, total duration zero\n");
+ return -EINVAL;
+ }
+
+ if (lodev->txcarrier < lodev->rxcarriermin ||
+ lodev->txcarrier > lodev->rxcarriermax) {
+ dprintk("ignoring tx, carrier out of range\n");
+ goto out;
+ }
+
+ if (lodev->learning)
+ rxmask = RXMASK_LEARNING;
+ else
+ rxmask = RXMASK_REGULAR;
+
+ if (!(rxmask & lodev->txmask)) {
+ dprintk("ignoring tx, rx mask mismatch\n");
+ goto out;
+ }
+
+ for (i = 0; i < count; i++) {
+ rawir.pulse = i % 2 ? false : true;
+ rawir.duration = abs(txbuf[i]) * 1000;
+ if (rawir.duration)
+ ir_raw_event_store_with_filter(dev, &rawir);
+ }
+ ir_raw_event_handle(dev);
+
+out:
+ /* Lirc expects this function to take as long as the total duration */
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(usecs_to_jiffies(total_duration));
+ return n;
+}
+
+static void loop_set_idle(struct rc_dev *dev, bool enable)
+{
+ struct loopback_dev *lodev = dev->priv;
+
+ if (lodev->idle != enable) {
+ dprintk("%sing idle mode\n", enable ? "enter" : "exit");
+ lodev->idle = enable;
+ }
+}
+
+static int loop_set_learning_mode(struct rc_dev *dev, int enable)
+{
+ struct loopback_dev *lodev = dev->priv;
+
+ if (lodev->learning != enable) {
+ dprintk("%sing learning mode\n", enable ? "enter" : "exit");
+ lodev->learning = !!enable;
+ }
+
+ return 0;
+}
+
+static int loop_set_carrier_report(struct rc_dev *dev, int enable)
+{
+ struct loopback_dev *lodev = dev->priv;
+
+ if (lodev->carrierreport != enable) {
+ dprintk("%sabling carrier reports\n", enable ? "en" : "dis");
+ lodev->carrierreport = !!enable;
+ }
+
+ return 0;
+}
+
+static int __init loop_init(void)
+{
+ struct rc_dev *rc;
+ int ret;
+
+ rc = rc_allocate_device();
+ if (!rc) {
+ printk(KERN_ERR DRIVER_NAME ": rc_dev allocation failed\n");
+ return -ENOMEM;
+ }
+
+ rc->input_name = "rc-core loopback device";
+ rc->input_phys = "rc-core/virtual";
+ rc->input_id.bustype = BUS_VIRTUAL;
+ rc->input_id.version = 1;
+ rc->driver_name = DRIVER_NAME;
+ rc->map_name = RC_MAP_EMPTY;
+ rc->priv = &loopdev;
+ rc->driver_type = RC_DRIVER_IR_RAW;
+ rc->allowed_protos = RC_TYPE_ALL;
+ rc->timeout = 100 * 1000 * 1000; /* 100 ms */
+ rc->min_timeout = 1;
+ rc->max_timeout = UINT_MAX;
+ rc->rx_resolution = 1000;
+ rc->tx_resolution = 1000;
+ rc->s_tx_mask = loop_set_tx_mask;
+ rc->s_tx_carrier = loop_set_tx_carrier;
+ rc->s_tx_duty_cycle = loop_set_tx_duty_cycle;
+ rc->s_rx_carrier_range = loop_set_rx_carrier_range;
+ rc->tx_ir = loop_tx_ir;
+ rc->s_idle = loop_set_idle;
+ rc->s_learning_mode = loop_set_learning_mode;
+ rc->s_carrier_report = loop_set_carrier_report;
+ rc->priv = &loopdev;
+
+ loopdev.txmask = RXMASK_REGULAR;
+ loopdev.txcarrier = 36000;
+ loopdev.txduty = 50;
+ loopdev.rxcarriermin = 1;
+ loopdev.rxcarriermax = ~0;
+ loopdev.idle = true;
+ loopdev.learning = false;
+ loopdev.carrierreport = false;
+
+ ret = rc_register_device(rc);
+ if (ret < 0) {
+ printk(KERN_ERR DRIVER_NAME ": rc_dev registration failed\n");
+ rc_free_device(rc);
+ return ret;
+ }
+
+ loopdev.dev = rc;
+ return 0;
+}
+
+static void __exit loop_exit(void)
+{
+ rc_unregister_device(loopdev.dev);
+}
+
+module_init(loop_init);
+module_exit(loop_exit);
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable debug messages");
+
+MODULE_DESCRIPTION("Loopback device for rc-core debugging");
+MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
+MODULE_LICENSE("GPL");

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