From 35c82ff2fc63ab823770f9776e6b6a0f81cd4452 Mon Sep 17 00:00:00 2001
From: px4dev <px4@purgatory.org>
Date: Sat, 29 Dec 2012 00:01:04 -0800
Subject: Make mixer ioctls load from a memory buffer rather than a file. This
 is prep for uploading the memory buffer to IO to be processed there.

---
 apps/drivers/drv_mixer.h     |  7 +++++--
 apps/drivers/hil/hil.cpp     | 18 ++++++++----------
 apps/drivers/px4fmu/fmu.cpp  | 17 ++++++-----------
 apps/drivers/px4io/px4io.cpp | 32 +++++++++++++++++---------------
 4 files changed, 36 insertions(+), 38 deletions(-)

(limited to 'apps/drivers')

diff --git a/apps/drivers/drv_mixer.h b/apps/drivers/drv_mixer.h
index 498ca9836..9f43015d9 100644
--- a/apps/drivers/drv_mixer.h
+++ b/apps/drivers/drv_mixer.h
@@ -100,10 +100,13 @@ struct mixer_simple_s {
  */
 #define MIXERIOCADDSIMPLE	_MIXERIOC(2)
 
+/* _MIXERIOC(3) was deprecated */
+/* _MIXERIOC(4) was deprecated */
+
 /**
- * Add mixers(s) from a the file in (const char *)arg
+ * Add mixer(s) from the buffer in (const char *)arg
  */
-#define MIXERIOCLOADFILE	_MIXERIOC(4)
+#define MIXERIOCLOADBUF		_MIXERIOC(5)
 
 /*
  * XXX Thoughts for additional operations:
diff --git a/apps/drivers/hil/hil.cpp b/apps/drivers/hil/hil.cpp
index 0780f3bb2..f227db1f7 100644
--- a/apps/drivers/hil/hil.cpp
+++ b/apps/drivers/hil/hil.cpp
@@ -577,21 +577,19 @@ HIL::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 			break;
 		}
 
-	case MIXERIOCLOADFILE: {
-			const char *path = (const char *)arg;
+	case MIXERIOCLOADBUF: {
+			const char *buf = (const char *)arg;
+			unsigned buflen = strnlen(buf, 1024);
 
-			if (_mixers != nullptr) {
-				delete _mixers;
-				_mixers = nullptr;
-			}
+			if (_mixers == nullptr)
+				_mixers = new MixerGroup(control_callback, (uintptr_t)&_controls);
 
-			_mixers = new MixerGroup(control_callback, (uintptr_t)&_controls);
 			if (_mixers == nullptr) {
 				ret = -ENOMEM;
+
 			} else {
 
-				debug("loading mixers from %s", path);
-				ret = _mixers->load_from_file(path);
+				ret = _mixers->load_from_buf(buf, buflen);
 
 				if (ret != 0) {
 					debug("mixer load failed with %d", ret);
@@ -600,10 +598,10 @@ HIL::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 					ret = -EINVAL;
 				}
 			}
-
 			break;
 		}
 
+
 	default:
 		ret = -ENOTTY;
 		break;
diff --git a/apps/drivers/px4fmu/fmu.cpp b/apps/drivers/px4fmu/fmu.cpp
index e21250727..a8d160117 100644
--- a/apps/drivers/px4fmu/fmu.cpp
+++ b/apps/drivers/px4fmu/fmu.cpp
@@ -544,23 +544,19 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 			break;
 		}
 
-	case MIXERIOCLOADFILE: {
-			const char *path = (const char *)arg;
+	case MIXERIOCLOADBUF: {
+			const char *buf = (const char *)arg;
+			unsigned buflen = strnlen(buf, 1024);
 
-			if (_mixers != nullptr) {
-				delete _mixers;
-				_mixers = nullptr;
-			}
-
-			_mixers = new MixerGroup(control_callback, (uintptr_t)&_controls);
+			if (_mixers == nullptr)
+				_mixers = new MixerGroup(control_callback, (uintptr_t)&_controls);
 
 			if (_mixers == nullptr) {
 				ret = -ENOMEM;
 
 			} else {
 
-				debug("loading mixers from %s", path);
-				ret = _mixers->load_from_file(path);
+				ret = _mixers->load_from_buf(buf, buflen);
 
 				if (ret != 0) {
 					debug("mixer load failed with %d", ret);
@@ -569,7 +565,6 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 					ret = -EINVAL;
 				}
 			}
-
 			break;
 		}
 
diff --git a/apps/drivers/px4io/px4io.cpp b/apps/drivers/px4io/px4io.cpp
index d185a1ac4..cb69856c8 100644
--- a/apps/drivers/px4io/px4io.cpp
+++ b/apps/drivers/px4io/px4io.cpp
@@ -609,27 +609,29 @@ PX4IO::ioctl(file *filep, int cmd, unsigned long arg)
 		}
 		break;
 
-	case MIXERIOCLOADFILE: {
-			MixerGroup *newmixers;
-			const char *path = (const char *)arg;
+	case MIXERIOCLOADBUF: {
+			const char *buf = (const char *)arg;
+			unsigned buflen = strnlen(buf, 1024);
 
-			/* allocate a new mixer group and load it from the file */
-			newmixers = new MixerGroup(control_callback, (uintptr_t)&_controls);
+			if (_mixers == nullptr)
+				_mixers = new MixerGroup(control_callback, (uintptr_t)&_controls);
 
-			if (newmixers->load_from_file(path) != 0) {
-				delete newmixers;
-				ret = -EINVAL;
-			}
+			if (_mixers == nullptr) {
+				ret = -ENOMEM;
 
-			/* swap the new mixers in for the old */
-			if (_mixers != nullptr) {
-				delete _mixers;
-			}
+			} else {
 
-			_mixers = newmixers;
+				ret = _mixers->load_from_buf(buf, buflen);
 
+				if (ret != 0) {
+					debug("mixer load failed with %d", ret);
+					delete _mixers;
+					_mixers = nullptr;
+					ret = -EINVAL;
+				}
+			}
+			break;
 		}
-		break;
 
 	default:
 		/* not a recognised value */
-- 
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