[PATCH 04/11] pinctrl: scmi: report an off setting as not set

[Clément Le Goffic]

A get of a setting that is on or off, the flags and the pulls, returned
0 as a value, so every one of them showed as set on every pin. Return
-EINVAL when the platform answers 0, which is how pinconf reports a
setting that is not active.

Fixes: eb524cb651b7 ("pinctrl: Implementation of the generic scmi-pinctrl driver")
Signed-off-by: Clément Le Goffic <clegoffic at baylibre.com>
---
 drivers/pinctrl/pinctrl-scmi.c | 48 ++++++++++++++++++++++++++++++++++++------
 1 file changed, 41 insertions(+), 7 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-scmi.c b/drivers/pinctrl/pinctrl-scmi.c
index f74ef0952ba9..355ad26cb215 100644
--- a/drivers/pinctrl/pinctrl-scmi.c
+++ b/drivers/pinctrl/pinctrl-scmi.c
@@ -153,13 +153,41 @@ static int pinctrl_scmi_map_pinconf_type(enum pin_config_param param,
 	return 0;
 }
 
-static u32 pinctrl_scmi_map_pinconf_arg_get(enum pin_config_param param,
-					    u32 value)
+static bool pinctrl_scmi_pinconf_inactive_flag(enum pin_config_param param,
+					       u32 value)
 {
-	if (param == PIN_CONFIG_DRIVE_STRENGTH)
-		return value / MILLI;
+	if (value)
+		return false;
 
-	return value;
+	switch (param) {
+	case PIN_CONFIG_BIAS_BUS_HOLD:
+	case PIN_CONFIG_BIAS_DISABLE:
+	case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+	case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
+	case PIN_CONFIG_BIAS_PULL_UP:
+	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+	case PIN_CONFIG_DRIVE_OPEN_SOURCE:
+	case PIN_CONFIG_DRIVE_PUSH_PULL:
+	case PIN_CONFIG_INPUT_ENABLE:
+	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
+	case PIN_CONFIG_OUTPUT_ENABLE:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static int pinctrl_scmi_map_pinconf_arg_get(enum pin_config_param param,
+					    u32 *value)
+{
+	if (pinctrl_scmi_pinconf_inactive_flag(param, *value))
+		return -EINVAL;
+
+	if (param == PIN_CONFIG_DRIVE_STRENGTH)
+		*value /= MILLI;
+
+	return 0;
 }
 
 static int pinctrl_scmi_map_pinconf_type_get(enum pin_config_param param,
@@ -232,7 +260,10 @@ static int pinctrl_scmi_pinconf_get(struct pinctrl_dev *pctldev,
 	if (ret)
 		return ret;
 
-	config_value = pinctrl_scmi_map_pinconf_arg_get(config_type, config_value);
+	ret = pinctrl_scmi_map_pinconf_arg_get(config_type, &config_value);
+	if (ret)
+		return ret;
+
 	*config = pinconf_to_config_packed(config_type, config_value);
 
 	return 0;
@@ -390,7 +421,10 @@ static int pinctrl_scmi_pinconf_group_get(struct pinctrl_dev *pctldev,
 	if (ret)
 		return ret;
 
-	config_value = pinctrl_scmi_map_pinconf_arg_get(config_type, config_value);
+	ret = pinctrl_scmi_map_pinconf_arg_get(config_type, &config_value);
+	if (ret)
+		return ret;
+
 	*config = pinconf_to_config_packed(config_type, config_value);
 
 	return 0;

-- 
2.56.0