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Subject[PATCH v2 4/4] leds: lm3532: Add full scale current configuration
Date
Allow the full scale current to be configured at init.
Valid rangles are 5mA->29.8mA.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
---

v2 - Change ti,fs-current to led-max-microamp - https://lore.kernel.org/patchwork/patch/1109503/

drivers/leds/leds-lm3532.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/leds-lm3532.c b/drivers/leds/leds-lm3532.c
index ef4c74cbcdc0..dabf4be1e8c8 100644
--- a/drivers/leds/leds-lm3532.c
+++ b/drivers/leds/leds-lm3532.c
@@ -89,6 +89,10 @@
#define LM3532_NUM_AVG_VALS 8
#define LM3532_NUM_IMP_VALS 32

+#define LM3532_FS_CURR_MIN 5000
+#define LM3532_FS_CURR_MAX 29800
+#define LM3532_FS_CURR_STEP 800
+
/*
* struct lm3532_als_data
* @config - value of ALS configuration register
@@ -121,6 +125,7 @@ struct lm3532_als_data {
* @mode - Mode of the LED string
* @ctrl_brt_pointer - Zone target register that controls the sink
* @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
* @label - LED label
*/
@@ -130,8 +135,9 @@ struct lm3532_led {

int control_bank;
int mode;
- int ctrl_brt_pointer;
int num_leds;
+ int ctrl_brt_pointer;
+ int full_scale_current;
u32 led_strings[LM3532_MAX_CONTROL_BANKS];
char label[LED_MAX_NAME_SIZE];
};
@@ -363,6 +369,8 @@ static int lm3532_init_registers(struct lm3532_led *led)
unsigned int output_cfg_mask = 0;
unsigned int brightness_config_reg;
unsigned int brightness_config_val;
+ int fs_current_reg;
+ int fs_current_val;
int ret, i;

if (drvdata->enable_gpio)
@@ -385,6 +393,16 @@ static int lm3532_init_registers(struct lm3532_led *led)
if (ret)
return ret;

+ if (led->full_scale_current) {
+ fs_current_reg = LM3532_REG_CTRL_A_FS_CURR + led->control_bank * 2;
+ fs_current_val = led->full_scale_current - LM3532_FS_CURR_MIN /
+ LM3532_FS_CURR_STEP;
+ ret = regmap_write(drvdata->regmap, fs_current_reg,
+ fs_current_val);
+ if (ret)
+ return ret;
+ }
+
for (i = 0; i < led->num_leds; i++) {
output_cfg_shift = led->led_strings[i] * 2;
output_cfg_val |= (led->control_bank << output_cfg_shift);
@@ -560,6 +578,12 @@ static int lm3532_parse_node(struct lm3532_data *priv)
goto child_out;
}

+ ret = fwnode_property_read_u32(child, "led-max-microamp",
+ &led->full_scale_current);
+
+ if (led->full_scale_current > LM3532_FS_CURR_MAX)
+ led->full_scale_current = LM3532_FS_CURR_MAX;
+
if (led->mode == LM3532_BL_MODE_ALS) {
led->mode = LM3532_ALS_CTRL;
ret = lm3532_parse_als(priv);
--
2.22.0.214.g8dca754b1e
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