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authorDan Murphy <dmurphy@ti.com>2019-08-20 14:53:07 -0500
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2019-08-26 20:03:58 +0200
commit517ea49a7b23c6730ed1a23f152fcd32173eb300 (patch)
tree43965df8ccb9d0ec6b1789e766d063af494acebd /drivers/leds
parentaa01d255cf101d027f3fabae778cf3eca4d0d899 (diff)
downloadlinux-517ea49a7b23c6730ed1a23f152fcd32173eb300.tar.bz2
leds: lm3532: Add full scale current configuration
Allow the full scale current to be configured at init. Valid rangles are 5mA->29.8mA. Signed-off-by: Dan Murphy <dmurphy@ti.com> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/leds-lm3532.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/leds/leds-lm3532.c b/drivers/leds/leds-lm3532.c
index 5e33ae4561f2..ba352d76a8fb 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
*/
@@ -132,6 +137,7 @@ struct lm3532_led {
int mode;
int ctrl_brt_pointer;
int num_leds;
+ 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 +393,17 @@ 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 +579,12 @@ 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);