regmap: When we sanity check during range adds say what errors we find

Rather than just returning a single error code for every possible thing we
can notice print an error message saying what the problem was. This makes
it very much easier to figure out what's wrong and fix it.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index ea9d6eb826bdaa611313e6eaf6e4d9b3d5c84a01..0544f63ecd318b9cbe06b4d9b80f2c533610a9c9 100644 (file)
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -524,11 +524,29 @@ struct regmap *regmap_init(struct device *dev,
                struct regmap_range_node *new;
 
                /* Sanity check */
-               if (range_cfg->range_max < range_cfg->range_min ||
-                   range_cfg->range_max > map->max_register ||
-                   range_cfg->selector_reg > map->max_register ||
-                   range_cfg->window_len == 0)
+               if (range_cfg->range_max < range_cfg->range_min) {
+                       dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
+                               range_cfg->range_max, range_cfg->range_min);
                        goto err_range;
+               }
+
+               if (range_cfg->range_max > map->max_register) {
+                       dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
+                               range_cfg->range_max, map->max_register);
+                       goto err_range;
+               }
+
+               if (range_cfg->selector_reg > map->max_register) {
+                       dev_err(map->dev,
+                               "Invalid range %d: selector out of map\n", i);
+                       goto err_range;
+               }
+
+               if (range_cfg->window_len == 0) {
+                       dev_err(map->dev, "Invalid range %d: window_len 0\n",
+                               i);
+                       goto err_range;
+               }
 
                /* Make sure, that this register range has no selector
                   or data window within its boundary */
@@ -540,11 +558,17 @@ struct regmap *regmap_init(struct device *dev,
 
                        if (range_cfg->range_min <= sel_reg &&
                            sel_reg <= range_cfg->range_max) {
+                               dev_err(map->dev,
+                                       "Range %d: selector for %d in window\n",
+                                       i, j);
                                goto err_range;
                        }
 
                        if (!(win_max < range_cfg->range_min ||
                              win_min > range_cfg->range_max)) {
+                               dev_err(map->dev,
+                                       "Range %d: window for %d in window\n",
+                                       i, j);
                                goto err_range;
                        }
                }
@@ -564,6 +588,7 @@ struct regmap *regmap_init(struct device *dev,
                new->window_len = range_cfg->window_len;
 
                if (_regmap_range_add(map, new) == false) {
+                       dev_err(map->dev, "Failed to add range %d\n", i);
                        kfree(new);
                        goto err_range;
                }