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-rw-r--r--drivers/base/regmap/regmap-debugfs.c39
1 files changed, 36 insertions, 3 deletions
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 3df274e0606..749a1dc5bbf 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -56,16 +56,46 @@ static const struct file_operations regmap_name_fops = {
.llseek = default_llseek,
};
+/*
+ * Work out where the start offset maps into register numbers, bearing
+ * in mind that we suppress hidden registers.
+ */
+static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
+ unsigned int base,
+ loff_t from,
+ loff_t *pos)
+{
+ loff_t p = *pos;
+ unsigned int i;
+
+ for (i = base; i <= map->max_register; i += map->reg_stride) {
+ if (!regmap_readable(map, i))
+ continue;
+
+ if (regmap_precious(map, i))
+ continue;
+
+ if (i >= from) {
+ *pos = p;
+ return i;
+ }
+
+ p += map->debugfs_tot_len;
+ }
+
+ return base;
+}
+
static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
unsigned int to, char __user *user_buf,
size_t count, loff_t *ppos)
{
size_t buf_pos = 0;
- loff_t p = 0;
+ loff_t p = *ppos;
ssize_t ret;
int i;
char *buf;
- unsigned int val;
+ unsigned int val, start_reg;
if (*ppos < 0 || !count)
return -EINVAL;
@@ -83,7 +113,10 @@ static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
map->debugfs_val_len + 3; /* : \n */
}
- for (i = from; i <= to; i += map->reg_stride) {
+ /* Work out which register we're starting at */
+ start_reg = regmap_debugfs_get_dump_start(map, from, *ppos, &p);
+
+ for (i = start_reg; i <= to; i += map->reg_stride) {
if (!regmap_readable(map, i))
continue;