[media] rc: rc-loopback: Add loopback of filter scancodes

Add the s_wakeup_filter callback to the rc-loopback driver, which instead
of setting the filter just feeds the scancode back through the input
device so that it can be verified.

Signed-off-by: James Hogan <james@albanarts.com>
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Cc: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/rc/rc-loopback.c b/drivers/media/rc/rc-loopback.c
index 06dd97d4b7cd8e14dd5ed04fcf8049a2c48df6ec..294c0fdbc5a9b99edf6e430ed91bd3c52e85c18e 100644 (file)
--- a/drivers/media/rc/rc-loopback.c
+++ b/drivers/media/rc/rc-loopback.c
@@ -22,6 +22,7 @@
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/sched.h>
+#include <linux/slab.h>
 #include <media/rc-core.h>
 
 #define DRIVER_NAME    "rc-loopback"
@@ -172,6 +173,41 @@ static int loop_set_carrier_report(struct rc_dev *dev, int enable)
        return 0;
 }
 
+static int loop_set_wakeup_filter(struct rc_dev *dev,
+                                 struct rc_scancode_filter *sc)
+{
+       static const unsigned int max = 512;
+       struct ir_raw_event *raw;
+       int ret;
+       int i;
+
+       /* fine to disable filter */
+       if (!sc->mask)
+               return 0;
+
+       /* encode the specified filter and loop it back */
+       raw = kmalloc_array(max, sizeof(*raw), GFP_KERNEL);
+       if (!raw)
+               return -ENOMEM;
+
+       ret = ir_raw_encode_scancode(dev->wakeup_protocol, sc->data, raw, max);
+       /* still loop back the partial raw IR even if it's incomplete */
+       if (ret == -ENOBUFS)
+               ret = max;
+       if (ret >= 0) {
+               /* do the loopback */
+               for (i = 0; i < ret; ++i)
+                       ir_raw_event_store(dev, &raw[i]);
+               ir_raw_event_handle(dev);
+
+               ret = 0;
+       }
+
+       kfree(raw);
+
+       return ret;
+}
+
 static int __init loop_init(void)
 {
        struct rc_dev *rc;
@@ -192,6 +228,8 @@ static int __init loop_init(void)
        rc->priv                = &loopdev;
        rc->driver_type         = RC_DRIVER_IR_RAW;
        rc->allowed_protocols   = RC_BIT_ALL_IR_DECODER;
+       rc->allowed_wakeup_protocols = RC_BIT_ALL_IR_ENCODER;
+       rc->encode_wakeup       = true;
        rc->timeout             = 100 * 1000 * 1000; /* 100 ms */
        rc->min_timeout         = 1;
        rc->max_timeout         = UINT_MAX;
@@ -205,6 +243,7 @@ static int __init loop_init(void)
        rc->s_idle              = loop_set_idle;
        rc->s_learning_mode     = loop_set_learning_mode;
        rc->s_carrier_report    = loop_set_carrier_report;
+       rc->s_wakeup_filter     = loop_set_wakeup_filter;
 
        loopdev.txmask          = RXMASK_REGULAR;
        loopdev.txcarrier       = 36000;