gpio: add trace events for setting direction and value

This patch allows to trace gpio operations using ftrace

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 56 insertions, 0 deletions

diff --git a/include/trace/events/gpio.h b/include/trace/events/gpio.h
new file mode 100644
index 000000000000..927a8ad9e51b
--- /dev/null
+++ b/include/trace/events/gpio.h
@@ -0,0 +1,56 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM gpio
+
+#if !defined(_TRACE_GPIO_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_GPIO_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(gpio_direction,
+
+        TP_PROTO(unsigned gpio, int in, int err),
+
+        TP_ARGS(gpio, in, err),
+
+        TP_STRUCT__entry(
+                __field(unsigned, gpio)
+                __field(int, in)
+                __field(int, err)
+        ),
+
+        TP_fast_assign(
+                __entry->gpio = gpio;
+                __entry->in = in;
+                __entry->err = err;
+        ),
+
+        TP_printk("%u %3s (%d)", __entry->gpio,
+                __entry->in ? "in" : "out", __entry->err)
+);
+
+TRACE_EVENT(gpio_value,
+
+        TP_PROTO(unsigned gpio, int get, int value),
+
+        TP_ARGS(gpio, get, value),
+
+        TP_STRUCT__entry(
+                __field(unsigned, gpio)
+                __field(int, get)
+                __field(int, value)
+        ),
+
+        TP_fast_assign(
+                __entry->gpio = gpio;
+                __entry->get = get;
+                __entry->value = value;
+        ),
+
+        TP_printk("%u %3s %d", __entry->gpio,
+                __entry->get ? "get" : "set", __entry->value)
+);
+
+#endif /* if !defined(_TRACE_GPIO_H) || defined(TRACE_HEADER_MULTI_READ) */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>