Add device tree support to the lm3630a driver and allow configuring
independently on both banks the mapping mode (linear or exponential),
initial and maximum LED brightness.
Driver was tested on a LG Nexus 5 (hammerhead) phone.
Signed-off-by: Brian Masney <masneyb@xxxxxxxxxxxxx>
---
drivers/video/backlight/lm3630a_bl.c | 69 ++++++++++++++++++++++++++++
1 file changed, 69 insertions(+)
diff --git a/drivers/video/backlight/lm3630a_bl.c b/drivers/video/backlight/lm3630a_bl.c
index ef2553f452ca..96fbc1273dda 100644
--- a/drivers/video/backlight/lm3630a_bl.c
+++ b/drivers/video/backlight/lm3630a_bl.c
@@ -35,6 +35,9 @@
#define REG_MAX 0x50
#define INT_DEBOUNCE_MSEC 10
+
+#define LM3630A_MAX_SOURCES 2
+
struct lm3630a_chip {
struct device *dev;
struct delayed_work work;
@@ -364,6 +367,64 @@ static const struct regmap_config lm3630a_regmap = {
.max_register = REG_MAX,
};
+static void lm3630a_parse_dt(struct lm3630a_chip *pchip)
+{
+ u32 sources[LM3630A_MAX_SOURCES], val;
+ struct device_node *child_node;
+ int num_sources, ret, i;
+ bool linear;
+
+ for_each_available_child_of_node(pchip->dev->of_node, child_node) {
+ num_sources = of_property_count_u32_elems(child_node,
+ "led-sources");
+ if (num_sources < 0)
+ continue;
+
+ if (num_sources > LM3630A_MAX_SOURCES)
+ num_sources = LM3630A_MAX_SOURCES;
+
+ ret = of_property_read_u32_array(child_node, "led-sources",
+ sources, num_sources);
+ if (ret) {
+ dev_err(pchip->dev,
+ "Error parsing led-sources node: %d\n", ret);
+ return;
+ }
+
+ linear = of_property_read_bool(child_node,
+ "ti,linear-mapping-mode");
+
+ for (i = 0; i < num_sources; i++) {
+ if (sources[i] == 0)
+ pchip->pdata->leda_ctrl = linear ?
+ LM3630A_LEDA_ENABLE_LINEAR :
+ LM3630A_LEDA_ENABLE;
+ else if (sources[i] == 1)
+ pchip->pdata->ledb_ctrl = linear ?
+ LM3630A_LEDB_ENABLE_LINEAR :
+ LM3630A_LEDB_ENABLE;
+
+ ret = of_property_read_u32(child_node,
+ "default-brightness", &val);
+ if (!ret) {
+ if (sources[i] == 0)
+ pchip->pdata->leda_init_brt = val;
+ else if (sources[i] == 1)
+ pchip->pdata->ledb_init_brt = val;
+ }
+
+ ret = of_property_read_u32(child_node, "max-brightness",
+ &val);
+ if (!ret) {
+ if (sources[i] == 0)
+ pchip->pdata->leda_max_brt = val;
+ else if (sources[i] == 1)
+ pchip->pdata->ledb_max_brt = val;
+ }
+ }
+ };
+}
+
static int lm3630a_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -405,6 +466,7 @@ static int lm3630a_probe(struct i2c_client *client,
pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
}
pchip->pdata = pdata;
+ lm3630a_parse_dt(pchip);
/* chip initialize */
rval = lm3630a_chip_init(pchip);
@@ -470,11 +532,18 @@ static const struct i2c_device_id lm3630a_id[] = {
{}
};
+static const struct of_device_id lm3630a_match_table[] = {
+ { .compatible = "ti,lm3630a", },
+ { },
+};
+
+
MODULE_DEVICE_TABLE(i2c, lm3630a_id);
static struct i2c_driver lm3630a_i2c_driver = {
.driver = {
.name = LM3630A_NAME,
+ .of_match_table = lm3630a_match_table,
},
.probe = lm3630a_probe,
.remove = lm3630a_remove,
--
2.20.1
