hwmon: (max31827) Handle new properties from the devicetree

Used fwnode to retrieve data from the devicetree in the init_client
function.

If the uint32 properties are not present, the default values are used
for max31827 chip.

Signed-off-by: Daniel Matyas <daniel.matyas@analog.com>
Link: https://lore.kernel.org/r/20231031182158.124608-1-daniel.matyas@analog.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 69 insertions, 6 deletions

diff --git a/drivers/hwmon/max31827.c b/drivers/hwmon/max31827.c
index a1ce65145669..3f1312b555ab 100644
--- a/drivers/hwmon/max31827.c
+++ b/drivers/hwmon/max31827.c
@@ -11,6 +11,7 @@
 #include <linux/hwmon.h>
 #include <linux/i2c.h>
 #include <linux/mutex.h>
+#include <linux/of_device.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 
@@ -23,9 +24,17 @@
 
 #define MAX31827_CONFIGURATION_1SHOT_MASK	BIT(0)
 #define MAX31827_CONFIGURATION_CNV_RATE_MASK	GENMASK(3, 1)
+#define MAX31827_CONFIGURATION_TIMEOUT_MASK	BIT(5)
+#define MAX31827_CONFIGURATION_RESOLUTION_MASK	GENMASK(7, 6)
+#define MAX31827_CONFIGURATION_ALRM_POL_MASK	BIT(8)
+#define MAX31827_CONFIGURATION_COMP_INT_MASK	BIT(9)
+#define MAX31827_CONFIGURATION_FLT_Q_MASK	GENMASK(11, 10)
 #define MAX31827_CONFIGURATION_U_TEMP_STAT_MASK	BIT(14)
 #define MAX31827_CONFIGURATION_O_TEMP_STAT_MASK	BIT(15)
 
+#define MAX31827_ALRM_POL_LOW	0x0
+#define MAX31827_FLT_Q_1	0x0
+
 #define MAX31827_12_BIT_CNV_TIME	140
 
 #define MAX31827_16_BIT_TO_M_DGR(x)	(sign_extend32(x, 15) * 1000 / 16)
@@ -362,14 +371,68 @@ static int max31827_write(struct device *dev, enum hwmon_sensor_types type,
 	return -EOPNOTSUPP;
 }
 
-static int max31827_init_client(struct max31827_state *st)
+static int max31827_init_client(struct max31827_state *st,
+				struct device *dev)
 {
+	struct fwnode_handle *fwnode;
+	unsigned int res = 0;
+	u32 data, lsb_idx;
+	bool prop;
+	int ret;
+
+	fwnode = dev_fwnode(dev);
+
 	st->enable = true;
+	res |= MAX31827_DEVICE_ENABLE(1);
+
+	res |= MAX31827_CONFIGURATION_RESOLUTION_MASK;
+
+	prop = fwnode_property_read_bool(fwnode, "adi,comp-int");
+	res |= FIELD_PREP(MAX31827_CONFIGURATION_COMP_INT_MASK, prop);
+
+	prop = fwnode_property_read_bool(fwnode, "adi,timeout-enable");
+	res |= FIELD_PREP(MAX31827_CONFIGURATION_TIMEOUT_MASK, !prop);
+
+	if (fwnode_property_present(fwnode, "adi,alarm-pol")) {
+		ret = fwnode_property_read_u32(fwnode, "adi,alarm-pol", &data);
+		if (ret)
+			return ret;
+
+		res |= FIELD_PREP(MAX31827_CONFIGURATION_ALRM_POL_MASK, !!data);
+	} else {
+		/*
+		 * Set default value.
+		 */
+		res |= FIELD_PREP(MAX31827_CONFIGURATION_ALRM_POL_MASK,
+				  MAX31827_ALRM_POL_LOW);
+	}
+
+	if (fwnode_property_present(fwnode, "adi,fault-q")) {
+		ret = fwnode_property_read_u32(fwnode, "adi,fault-q", &data);
+		if (ret)
+			return ret;
+
+		/*
+		 * Convert the desired fault queue into register bits.
+		 */
+		if (data != 0)
+			lsb_idx = __ffs(data);
+
+		if (hweight32(data) != 1 || lsb_idx > 4) {
+			dev_err(dev, "Invalid data in adi,fault-q\n");
+			return -EINVAL;
+		}
+
+		res |= FIELD_PREP(MAX31827_CONFIGURATION_FLT_Q_MASK, lsb_idx);
+	} else {
+		/*
+		 * Set default value.
+		 */
+		res |= FIELD_PREP(MAX31827_CONFIGURATION_FLT_Q_MASK,
+				  MAX31827_FLT_Q_1);
+	}
 
-	return regmap_update_bits(st->regmap, MAX31827_CONFIGURATION_REG,
-				  MAX31827_CONFIGURATION_1SHOT_MASK |
-					  MAX31827_CONFIGURATION_CNV_RATE_MASK,
-				  MAX31827_DEVICE_ENABLE(1));
+	return regmap_write(st->regmap, MAX31827_CONFIGURATION_REG, res);
 }
 
 static const struct hwmon_channel_info *max31827_info[] = {
@@ -417,7 +480,7 @@ static int max31827_probe(struct i2c_client *client)
 	if (err)
 		return dev_err_probe(dev, err, "failed to enable regulator\n");
 
-	err = max31827_init_client(st);
+	err = max31827_init_client(st, dev);
 	if (err)
 		return err;