3 files changed, 274 insertions, 0 deletions

diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index 42b4feb0e7f9..3785162f928e 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -177,4 +177,17 @@ config IR_WINBOND_CIR
            To compile this driver as a module, choose M here: the module will
            be called winbond_cir.
 
+config RC_LOOPBACK
+        tristate "Remote Control Loopback Driver"
+        depends on RC_CORE
+        ---help---
+           Say Y here if you want support for the remote control loopback
+           driver which allows TX data to be sent back as RX data.
+           This is mostly useful for debugging purposes.
+
+           If you're not sure, select N here.
+
+           To compile this driver as a module, choose M here: the module will
+           be called rc_loopback.
+
 endif #RC_CORE
diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
index 78ac8c5c8adc..67b4f7fe2577 100644
--- a/drivers/media/rc/Makefile
+++ b/drivers/media/rc/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o
 obj-$(CONFIG_IR_ENE) += ene_ir.o
 obj-$(CONFIG_IR_STREAMZAP) += streamzap.o
 obj-$(CONFIG_IR_WINBOND_CIR) += winbond-cir.o
+obj-$(CONFIG_RC_LOOPBACK) += rc-loopback.o
diff --git a/drivers/media/rc/rc-loopback.c b/drivers/media/rc/rc-loopback.c
new file mode 100644
index 000000000000..49cee61d79c6
--- /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");