media: rc: add ioctl to get the current timeout

Since the kernel now modifies the timeout, make it possible to retrieve
the current value.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/rc/lirc-func.rst

@@ -17,6 +17,7 @@ LIRC Function Reference
     lirc-get-rec-resolution
     lirc-set-send-duty-cycle
     lirc-get-timeout
+    lirc-get-rec-timeout
     lirc-set-rec-timeout
     lirc-set-rec-carrier
     lirc-set-rec-carrier-range

Documentation/media/uapi/rc/lirc-set-rec-timeout.rst

@@ -1,19 +1,23 @@
 .. -*- coding: utf-8; mode: rst -*-
 
 .. _lirc_set_rec_timeout:
+.. _lirc_get_rec_timeout:
 
-**************************
+***************************************************
-ioctl LIRC_SET_REC_TIMEOUT
+ioctl LIRC_GET_REC_TIMEOUT and LIRC_SET_REC_TIMEOUT
-**************************
+***************************************************
 
 Name
 ====
 
-LIRC_SET_REC_TIMEOUT - sets the integer value for IR inactivity timeout.
+LIRC_GET_REC_TIMEOUT/LIRC_SET_REC_TIMEOUT - Get/set the integer value for IR inactivity timeout.
 
 Synopsis
 ========
 
+.. c:function:: int ioctl( int fd, LIRC_GET_REC_TIMEOUT, __u32 *timeout )
+    :name: LIRC_GET_REC_TIMEOUT
+
 .. c:function:: int ioctl( int fd, LIRC_SET_REC_TIMEOUT, __u32 *timeout )
     :name: LIRC_SET_REC_TIMEOUT
 
@@ -30,7 +34,7 @@ Arguments
 Description
 ===========
 
-Sets the integer value for IR inactivity timeout.
+Get and set the integer value for IR inactivity timeout.
 
 If supported by the hardware, setting it to 0  disables all hardware timeouts
 and data should be reported as soon as possible. If the exact value

drivers/media/rc/lirc_dev.c

@@ -575,6 +575,13 @@ static long ir_lirc_ioctl(struct file *file, unsigned int cmd,
 		}
 		break;
 
+	case LIRC_GET_REC_TIMEOUT:
+		if (!dev->timeout)
+			ret = -ENOTTY;
+		else
+			val = DIV_ROUND_UP(dev->timeout, 1000);
+		break;
+
 	case LIRC_SET_REC_TIMEOUT_REPORTS:
 		if (!dev->timeout)
 			ret = -ENOTTY;

include/uapi/linux/lirc.h

@@ -133,6 +133,12 @@
 
 #define LIRC_SET_WIDEBAND_RECEIVER     _IOW('i', 0x00000023, __u32)
 
+/*
+ * Return the recording timeout, which is either set by
+ * the ioctl LIRC_SET_REC_TIMEOUT or by the kernel after setting the protocols.
+ */
+#define LIRC_GET_REC_TIMEOUT	       _IOR('i', 0x00000024, __u32)
+
 /*
  * struct lirc_scancode - decoded scancode with protocol for use with
  *	LIRC_MODE_SCANCODE