[PATCH 3/4] spi: loopback-test: make dump_messages module parameter a bitmask

[kernel@xxxxxxxxxxxxxxxx]

From: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>

Make dump_messages module parameter a bitmask to allow for better
granularity when dumping messages.

Signed-off-by: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
---
 drivers/spi/spi-loopback-test.c |   40 ++++++++++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 11 deletions(-)

diff --git a/drivers/spi/spi-loopback-test.c b/drivers/spi/spi-loopback-test.c
index 8dac6a4..6e76c3e 100644
--- a/drivers/spi/spi-loopback-test.c
+++ b/drivers/spi/spi-loopback-test.c
@@ -36,11 +36,17 @@ MODULE_PARM_DESC(simulate_only, "if not 0 do not execute the spi message");
 
 /* dump spi messages */
 int dump_messages;
+#define DUMP_MESSAGE_AFTER		BIT(0)
+#define DUMP_MESSAGE_BEFORE		BIT(1)
+#define DUMP_MESSAGE_DATA_AFTER		BIT(2)
+#define DUMP_MESSAGE_DATA_BEFORE	BIT(3)
 module_param(dump_messages, int, 0);
-MODULE_PARM_DESC(dump_message,
-		 "=1 dump the basic spi_message_structure, " \
-		 "=2 dump the spi_message_structure including data, " \
-		 "=3 dump the spi_message structure before and after execution");
+MODULE_PARM_DESC(dump_messages,
+		 "BIT(0) - dump the basic spi_message_structure after processing, "
+		 "BIT(1) - dump the basic spi_message_structure before processing, "
+		 "BIT(2) - also dump the spi_message data after processing, "
+		 "BIT(3) - also dump the spi_message data before processing");
+
 /* the device is jumpered for loopback - enabling some rx_buf tests */
 int loopback;
 module_param(loopback, int, 0);
@@ -749,9 +755,15 @@ int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test,
 
 	/* only if we do not simulate */
 	if (!simulate_only) {
-		/* dump the complete message before and after the transfer */
-		if (dump_messages == 3)
-			spi_message_dump_data(spi, msg, 1024);
+		/* dump the complete message before the transfer */
+		if (dump_messages & DUMP_MESSAGE_BEFORE) {
+			/* calc bytes to dump */
+			if (dump_messages & DUMP_MESSAGE_DATA_BEFORE)
+				i = 1024;
+			else
+				i = 0;
+			spi_message_dump_data(spi, msg, i);
+		}
 
 		/* run spi message */
 		ret = spi_sync(spi, msg);
@@ -786,10 +798,16 @@ int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test,
 
 	/* if requested or on error dump message (including data) */
 exit:
-	if (dump_messages || ret)
-		spi_message_dump_data(spi, msg,
-				      ((dump_messages >= 2) || (ret)) ?
-				      1024 : 0);
+	if ((dump_messages & DUMP_MESSAGE_AFTER) || ret) {
+		/* calc bytes to dump */
+		i = 0;
+		if (dump_messages & DUMP_MESSAGE_DATA_AFTER)
+			i = 1024;
+		if (ret)
+			i = 1024;
+		/* dump the message */
+		spi_message_dump_data(spi, msg, i);
+	}
 
 	return ret;
 }
-- 
1.7.10.4

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