From 2c5b0fb9dbe9d3ef8a14eeab529cac581bc6bc72 Mon Sep 17 00:00:00 2001
From: Jason Zhang <jason.zhang@rock-chips.com>
Date: Tue, 7 Jun 2022 11:39:34 +0800
Subject: [PATCH] iio: Add FIFO event for LSM6DSR sensor HUB

Add FIFO event type:
* IIO_EV_TYPE_FIFO_FLUSH

This change also adds FIFO event directions:
* IIO_EV_DIR_FIFO_EMPTY (indicates the FIFO is empty)
* IIO_EV_DIR_FIFO_DATA (indicates the FIFO is not empty)

A FIFO flush event is triggered after the HW FIFO is flushed,
and indicates that whether the HW FIFO is empty or not.

Signed-off-by: Jason Zhang <jason.zhang@rock-chips.com>
Change-Id: Idb21bc271c7fd8def63f2cb29440ebf0677688d5
---
 drivers/iio/industrialio-event.c | 9 ++++++++-
 include/uapi/linux/iio/types.h   | 7 +++++++
 scripts/headers_install.sh       | 1 +
 tools/iio/iio_event_monitor.c    | 9 ++++++++-
 4 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
index 99ba657b8568..c0e346dc5dbf 100644
--- a/drivers/iio/industrialio-event.c
+++ b/drivers/iio/industrialio-event.c
@@ -228,12 +228,19 @@ static const char * const iio_ev_type_text[] = {
 	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
 	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
 	[IIO_EV_TYPE_CHANGE] = "change",
+#ifdef CONFIG_NO_GKI
+	[IIO_EV_TYPE_FIFO_FLUSH] = "fifo_flush",
+#endif
 };
 
 static const char * const iio_ev_dir_text[] = {
 	[IIO_EV_DIR_EITHER] = "either",
 	[IIO_EV_DIR_RISING] = "rising",
-	[IIO_EV_DIR_FALLING] = "falling"
+	[IIO_EV_DIR_FALLING] = "falling",
+#ifdef CONFIG_NO_GKI
+	[IIO_EV_DIR_FIFO_EMPTY] = "empty",
+	[IIO_EV_DIR_FIFO_DATA] = "data",
+#endif
 };
 
 static const char * const iio_ev_info_text[] = {
diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
index 48c13147c0a8..21be68dace1d 100644
--- a/include/uapi/linux/iio/types.h
+++ b/include/uapi/linux/iio/types.h
@@ -104,12 +104,19 @@ enum iio_event_type {
 	IIO_EV_TYPE_THRESH_ADAPTIVE,
 	IIO_EV_TYPE_MAG_ADAPTIVE,
 	IIO_EV_TYPE_CHANGE,
+#ifdef CONFIG_NO_GKI
+	IIO_EV_TYPE_FIFO_FLUSH,
+#endif
 };
 
 enum iio_event_direction {
 	IIO_EV_DIR_EITHER,
 	IIO_EV_DIR_RISING,
 	IIO_EV_DIR_FALLING,
+#ifdef CONFIG_NO_GKI
+	IIO_EV_DIR_FIFO_EMPTY,
+	IIO_EV_DIR_FIFO_DATA,
+#endif
 	IIO_EV_DIR_NONE,
 };
 
diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index dd554bd436cc..92ee71445e34 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -70,6 +70,7 @@ configs=$(sed -e '
 #
 # The format is <file-name>:<CONFIG-option> in each line.
 config_leak_ignores="
+include/uapi/linux/iio/types.h:CONFIG_NO_GKI
 arch/alpha/include/uapi/asm/setup.h:CONFIG_ALPHA_LEGACY_START_ADDRESS
 arch/arc/include/uapi/asm/page.h:CONFIG_ARC_PAGE_SIZE_16K
 arch/arc/include/uapi/asm/page.h:CONFIG_ARC_PAGE_SIZE_4K
diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
index bb03859db89d..5504e5661130 100644
--- a/tools/iio/iio_event_monitor.c
+++ b/tools/iio/iio_event_monitor.c
@@ -67,12 +67,19 @@ static const char * const iio_ev_type_text[] = {
 	[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
 	[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
 	[IIO_EV_TYPE_CHANGE] = "change",
+#ifdef CONFIG_NO_GKI
+	[IIO_EV_TYPE_FIFO_FLUSH] = "fifo_flush",
+#endif
 };
 
 static const char * const iio_ev_dir_text[] = {
 	[IIO_EV_DIR_EITHER] = "either",
 	[IIO_EV_DIR_RISING] = "rising",
-	[IIO_EV_DIR_FALLING] = "falling"
+	[IIO_EV_DIR_FALLING] = "falling",
+#ifdef CONFIG_NO_GKI
+	[IIO_EV_DIR_FIFO_EMPTY] = "empty",
+	[IIO_EV_DIR_FIFO_DATA] = "data",
+#endif
 };
 
 static const char * const iio_modifier_names[] = {