From 1044c180de4ba426aa5fb1b4b13b5f219ddb7105 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Fri, 6 Jul 2012 14:10:23 +0100
Subject: regmap: Add hook for printk logging for debugging during early init
Sometimes for failures during very early init the trace infrastructure
isn't available early enough to be used. For this sort of problem
defining LOG_DEVICE will add printks for basic register I/O on a specific
device, allowing trace to be extracted when the trace system doesn't come
up early enough to work with.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
drivers/base/regmap/regmap.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
(limited to 'drivers/base')
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 1cf721421bec..f8a937654af2 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -21,6 +21,18 @@
#include "internal.h"
+/*
+ * Sometimes for failures during very early init the trace
+ * infrastructure isn't available early enough to be used. For this
+ * sort of problem defining LOG_DEVICE will add printks for basic
+ * register I/O on a specific device.
+ */
+#undef LOG_DEVICE
+
+static int _regmap_update_bits(struct regmap *map, unsigned int reg,
+ unsigned int mask, unsigned int val,
+ bool *change);
+
bool regmap_writeable(struct regmap *map, unsigned int reg)
{
if (map->max_register && reg > map->max_register)
@@ -700,6 +712,11 @@ int _regmap_write(struct regmap *map, unsigned int reg,
}
}
+#ifdef LOG_DEVICE
+ if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
+ dev_info(map->dev, "%x <= %x\n", reg, val);
+#endif
+
trace_regmap_reg_write(map->dev, reg, val);
if (map->format.format_write) {
@@ -903,6 +920,12 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
if (ret == 0) {
*val = map->format.parse_val(map->work_buf);
+
+#ifdef LOG_DEVICE
+ if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
+ dev_info(map->dev, "%x => %x\n", reg, *val);
+#endif
+
trace_regmap_reg_read(map->dev, reg, *val);
}
--
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