We may currently get unpaired regulator calls when configuring the LED brightness via sysfs in case of regulator calls producing errors. Let's fix this by maintaining local state for enabled.
Signed-off-by: Tony Lindgren <[email protected]> --- drivers/leds/leds-lm3532.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/drivers/leds/leds-lm3532.c b/drivers/leds/leds-lm3532.c --- a/drivers/leds/leds-lm3532.c +++ b/drivers/leds/leds-lm3532.c @@ -127,6 +127,7 @@ struct lm3532_als_data { * @num_leds - Number of LED strings are supported in this array * @full_scale_current - The full-scale current setting for the current sink. * @led_strings - The LED strings supported in this array + * @enabled - Enabled status * @label - LED label */ struct lm3532_led { @@ -138,6 +139,7 @@ struct lm3532_led { int ctrl_brt_pointer; int num_leds; int full_scale_current; + int enabled:1; u32 led_strings[LM3532_MAX_CONTROL_BANKS]; char label[LED_MAX_NAME_SIZE]; }; @@ -292,11 +294,15 @@ static int lm3532_get_ramp_index(int ramp_time) ramp_time); } +/* Caller must take care of locking */ static int lm3532_led_enable(struct lm3532_led *led_data) { int ctrl_en_val = BIT(led_data->control_bank); int ret; + if (led_data->enabled) + return 0; + ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE, ctrl_en_val, ctrl_en_val); if (ret) { @@ -304,14 +310,24 @@ static int lm3532_led_enable(struct lm3532_led *led_data) return ret; } - return regulator_enable(led_data->priv->regulator); + ret = regulator_enable(led_data->priv->regulator); + if (ret < 0) + return ret; + + led_data->enabled = 1; + + return 0; } +/* Caller must take care of locking */ static int lm3532_led_disable(struct lm3532_led *led_data) { int ctrl_en_val = BIT(led_data->control_bank); int ret; + if (!led_data->enabled) + return 0; + ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE, ctrl_en_val, 0); if (ret) { @@ -319,7 +335,13 @@ static int lm3532_led_disable(struct lm3532_led *led_data) return ret; } - return regulator_disable(led_data->priv->regulator); + ret = regulator_disable(led_data->priv->regulator); + if (ret < 0) + return ret; + + led_data->enabled = 0; + + return 0; } static int lm3532_brightness_set(struct led_classdev *led_cdev, -- 2.23.0
