This patch adds support for optionally reading the proximity led diode
and current settings from device tree. This was tested using a LG
Nexus 5 (hammerhead) which requires a different diode than the driver
default for the IR LED.
Signed-off-by: Brian Masney <masneyb@xxxxxxxxxxxxx>
---
drivers/iio/light/tsl2772.c | 81 +++++++++++++++++++++++++++++++++++++
1 file changed, 81 insertions(+)
diff --git a/drivers/iio/light/tsl2772.c b/drivers/iio/light/tsl2772.c
index df5b2a0da96c..ae00edf0d87e 100644
--- a/drivers/iio/light/tsl2772.c
+++ b/drivers/iio/light/tsl2772.c
@@ -107,6 +107,8 @@
#define TSL2772_ALS_GAIN_TRIM_MIN 250
#define TSL2772_ALS_GAIN_TRIM_MAX 4000
+#define TSL2772_MAX_PROX_LEDS 2
+
/* Device family members */
enum {
tsl2571,
@@ -141,6 +143,14 @@ struct tsl2772_chip_info {
const struct iio_info *info;
};
+static const int tsl2772_led_currents[][2] = {
+ { 100000, TSL2772_100_mA },
+ { 50000, TSL2772_50_mA },
+ { 25000, TSL2772_25_mA },
+ { 13000, TSL2772_13_mA },
+ { 0, 0 }
+};
+
struct tsl2772_chip {
kernel_ulong_t id;
struct mutex prox_mutex;
@@ -515,6 +525,75 @@ static int tsl2772_get_prox(struct iio_dev *indio_dev)
return ret;
}
+static int tsl2772_read_prox_led_current(struct tsl2772_chip *chip)
+{
+ struct device_node *of_node = chip->client->dev.of_node;
+ int ret, tmp, i;
+
+ ret = of_property_read_u32(of_node, "led-max-microamp", &tmp);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; tsl2772_led_currents[i][0] != 0; i++) {
+ if (tmp == tsl2772_led_currents[i][0]) {
+ chip->settings.prox_power = tsl2772_led_currents[i][1];
+ return 0;
+ }
+ }
+
+ dev_err(&chip->client->dev, "Invalid value %d for led-max-microamp\n",
+ tmp);
+
+ return -EINVAL;
+
+}
+
+static int tsl2772_read_prox_diodes(struct tsl2772_chip *chip)
+{
+ struct device_node *of_node = chip->client->dev.of_node;
+ int i, ret, num_leds, prox_diode_mask;
+ u32 leds[TSL2772_MAX_PROX_LEDS];
+
+ ret = of_property_count_u32_elems(of_node, "amstaos,proximity-diodes");
+ if (ret < 0)
+ return ret;
+
+ num_leds = ret;
+ if (num_leds > TSL2772_MAX_PROX_LEDS)
+ num_leds = TSL2772_MAX_PROX_LEDS;
+
+ ret = of_property_read_u32_array(of_node, "amstaos,proximity-diodes",
+ leds, num_leds);
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "Invalid value for amstaos,proximity-diodes: %d.\n",
+ ret);
+ return ret;
+ }
+
+ prox_diode_mask = 0;
+ for (i = 0; i < num_leds; i++) {
+ if (leds[i] == 0)
+ prox_diode_mask |= TSL2772_DIODE0;
+ else if (leds[i] == 1)
+ prox_diode_mask |= TSL2772_DIODE1;
+ else {
+ dev_err(&chip->client->dev,
+ "Invalid value %d in amstaos,proximity-diodes.\n",
+ leds[i]);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static void tsl2772_parse_dt(struct tsl2772_chip *chip)
+{
+ tsl2772_read_prox_led_current(chip);
+ tsl2772_read_prox_diodes(chip);
+}
+
/**
* tsl2772_defaults() - Populates the device nominal operating parameters
* with those provided by a 'platform' data struct or
@@ -541,6 +620,8 @@ static void tsl2772_defaults(struct tsl2772_chip *chip)
memcpy(chip->tsl2772_device_lux,
tsl2772_default_lux_table_group[chip->id],
TSL2772_DEFAULT_TABLE_BYTES);
+
+ tsl2772_parse_dt(chip);
}
/**
--
2.17.1
--
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