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From:   Daniel Matyas <daniel.matyas@analog.com>
CC:     Daniel Matyas <daniel.matyas@analog.com>,
        Jean Delvare <jdelvare@suse.com>,
        Guenter Roeck <linux@roeck-us.net>,
        Jonathan Corbet <corbet@lwn.net>,
        <linux-hwmon@vger.kernel.org>, <linux-doc@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH v5 2/4] hwmon: max31827: Add support for max31828 and max31829
Date:   Thu, 26 Oct 2023 17:44:02 +0300
Message-ID: <20231026144405.546822-2-daniel.matyas@analog.com>
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When adi,flt-q and/or adi,alrm-pol are not mentioned,
the default configuration is loaded.

Signed-off-by: Daniel Matyas <daniel.matyas@analog.com>
---

v4 -> v5: Passed i2c_client to init_client(), because I needed it to
retrieve device id.
Used a simple if to load default configuration. No more switch.

v3 -> v4: No change.

v3: Added patch.

 drivers/hwmon/max31827.c | 51 +++++++++++++++++++++++++++++++---------
 1 file changed, 40 insertions(+), 11 deletions(-)

diff --git a/drivers/hwmon/max31827.c b/drivers/hwmon/max31827.c
index 7976d668ffd4..446232fa1710 100644
--- a/drivers/hwmon/max31827.c
+++ b/drivers/hwmon/max31827.c
@@ -39,10 +39,15 @@
 
 #define MAX31827_12_BIT_CNV_TIME	140
 
+#define MAX31827_ALRM_POL_HIGH	0x1
+#define MAX31827_FLT_Q_4	0x2
+
 #define MAX31827_16_BIT_TO_M_DGR(x)	(sign_extend32(x, 15) * 1000 / 16)
 #define MAX31827_M_DGR_TO_16_BIT(x)	(((x) << 4) / 1000)
 #define MAX31827_DEVICE_ENABLE(x)	((x) ? 0xA : 0x0)
 
+enum chips { max31827, max31828, max31829 };
+
 enum max31827_cnv {
 	MAX31827_CNV_1_DIV_64_HZ = 1,
 	MAX31827_CNV_1_DIV_32_HZ,
@@ -373,12 +378,22 @@ static int max31827_write(struct device *dev, enum hwmon_sensor_types type,
 	return -EOPNOTSUPP;
 }
 
+static const struct i2c_device_id max31827_i2c_ids[] = {
+	{ "max31827", max31827 },
+	{ "max31828", max31828 },
+	{ "max31829", max31829 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max31827_i2c_ids);
+
 static int max31827_init_client(struct max31827_state *st,
-				struct device *dev)
+				struct i2c_client *client)
 {
+	struct device *dev = &client->dev;
 	struct fwnode_handle *fwnode;
 	unsigned int res = 0;
 	u32 data, lsb_idx;
+	enum chips type;
 	bool prop;
 	int ret;
 
@@ -395,13 +410,20 @@ static int max31827_init_client(struct max31827_state *st,
 	prop = fwnode_property_read_bool(fwnode, "adi,timeout-enable");
 	res |= FIELD_PREP(MAX31827_CONFIGURATION_TIMEOUT_MASK, !prop);
 
+	if (dev->of_node)
+		type = (enum chips)of_device_get_match_data(dev);
+	else
+		type = i2c_match_id(max31827_i2c_ids, client)->driver_data;
+
 	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 if (type == max31829)
+		res |= FIELD_PREP(MAX31827_CONFIGURATION_ALRM_POL_MASK,
+				  MAX31827_ALRM_POL_HIGH);
 
 	if (fwnode_property_present(fwnode, "adi,fault-q")) {
 		ret = fwnode_property_read_u32(fwnode, "adi,fault-q", &data);
@@ -418,7 +440,9 @@ static int max31827_init_client(struct max31827_state *st,
 		}
 
 		res |= FIELD_PREP(MAX31827_CONFIGURATION_FLT_Q_MASK, lsb_idx);
-	}
+	} else if ((type == max31828) || (type == max31829))
+		res |= FIELD_PREP(MAX31827_CONFIGURATION_FLT_Q_MASK,
+				  MAX31827_FLT_Q_4);
 
 	return regmap_write(st->regmap, MAX31827_CONFIGURATION_REG, res);
 }
@@ -464,7 +488,7 @@ static int max31827_probe(struct i2c_client *client)
 		return dev_err_probe(dev, PTR_ERR(st->regmap),
 				     "Failed to allocate regmap.\n");
 
-	err = max31827_init_client(st, dev);
+	err = max31827_init_client(st, client);
 	if (err)
 		return err;
 
@@ -475,14 +499,19 @@ static int max31827_probe(struct i2c_client *client)
 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
-static const struct i2c_device_id max31827_i2c_ids[] = {
-	{ "max31827", 0 },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, max31827_i2c_ids);
-
 static const struct of_device_id max31827_of_match[] = {
-	{ .compatible = "adi,max31827" },
+	{
+		.compatible = "adi,max31827",
+		.data = (void *)max31827
+	},
+	{
+		.compatible = "adi,max31828",
+		.data = (void *)max31828
+	},
+	{
+		.compatible = "adi,max31829",
+		.data = (void *)max31829
+	},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, max31827_of_match);
-- 
2.34.1