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Subject[PATCH 3/3] regmap: Provide debugfs read of register ranges
Date
If a register range is named then provide a debugfs file showing the
contents of the range separately.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
drivers/base/regmap/internal.h | 1 +
drivers/base/regmap/regmap-debugfs.c | 31 +++++++++++++++++++++++++++++++
drivers/base/regmap/regmap.c | 1 +
3 files changed, 33 insertions(+)

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index 27e66c3..ac869d2 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -121,6 +121,7 @@ int _regmap_write(struct regmap *map, unsigned int reg,
struct regmap_range_node {
struct rb_node node;
const char *name;
+ struct regmap *map;

unsigned int range_min;
unsigned int range_max;
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 25b6843..f4b9dd0 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -183,6 +183,22 @@ static const struct file_operations regmap_map_fops = {
.llseek = default_llseek,
};

+static ssize_t regmap_range_read_file(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct regmap_range_node *range = file->private_data;
+ struct regmap *map = range->map;
+
+ return regmap_read_debugfs(map, range->range_min, range->range_max,
+ user_buf, count, ppos);
+}
+
+static const struct file_operations regmap_range_fops = {
+ .open = simple_open,
+ .read = regmap_range_read_file,
+ .llseek = default_llseek,
+};
+
static ssize_t regmap_access_read_file(struct file *file,
char __user *user_buf, size_t count,
loff_t *ppos)
@@ -253,6 +269,9 @@ static const struct file_operations regmap_access_fops = {

void regmap_debugfs_init(struct regmap *map, const char *name)
{
+ struct rb_node *next;
+ struct regmap_range_node *range_node;
+
if (name) {
map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
dev_name(map->dev), name);
@@ -285,6 +304,18 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
debugfs_create_bool("cache_bypass", 0400, map->debugfs,
&map->cache_bypass);
}
+
+ next = rb_first(&map->range_tree);
+ while (next) {
+ range_node = rb_entry(next, struct regmap_range_node, node);
+
+ if (range_node->name)
+ debugfs_create_file(range_node->name, 0400,
+ map->debugfs, range_node,
+ &regmap_range_fops);
+
+ next = rb_next(&range_node->node);
+ }
}

void regmap_debugfs_exit(struct regmap *map)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index ce5129d..366b629 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -579,6 +579,7 @@ struct regmap *regmap_init(struct device *dev,
goto err_range;
}

+ new->map = map;
new->name = range_cfg->name;
new->range_min = range_cfg->range_min;
new->range_max = range_cfg->range_max;
--
1.7.10.4


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