Commit bd790210 authored by Camel Guo's avatar Camel Guo Committed by Guenter Roeck
Browse files

hwmon: (tmp401) Add support of three advanced features 



tmp401 driver supports TMP401, TMP411 and TMP43X temperature sensors.
According to their datasheet:
- all of them support extended temperature range feature;
- TMP411 and TPM43X support n-factor correction feature;
- TMP43X support beta compensation feature.

In order to support setting them during bootup, this commit reads
ti,extended-range-enable, ti,n-factor and ti,beta-compensation and set
the corresponding registers during probing.

Signed-off-by: default avatarCamel Guo <camel.guo@axis.com>
Link: https://lore.kernel.org/r/20220414075824.2634839-3-camel.guo@axis.com


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent bd90c5b9

drivers/hwmon/tmp401.c

+43 −1
Original line number Diff line number Diff line
@@ -41,6 +41,8 @@ enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 }; 
#define TMP401_STATUS				0x02

#define TMP401_CONFIG				0x03

#define TMP401_CONVERSION_RATE			0x04

#define TMP4XX_N_FACTOR_REG			0x18

#define TMP43X_BETA_RANGE			0x25

#define TMP401_TEMP_CRIT_HYST			0x21

#define TMP401_MANUFACTURER_ID_REG		0xFE

#define TMP401_DEVICE_ID_REG			0xFF
@@ -543,6 +545,8 @@ static int tmp401_init_client(struct tmp401_data *data) 
	struct regmap *regmap = data->regmap;

	u32 config, config_orig;

	int ret;

	u32 val = 0;

	s32 nfactor = 0;



	/* Set conversion rate to 2 Hz */

	ret = regmap_write(regmap, TMP401_CONVERSION_RATE, 5);
@@ -557,10 +561,48 @@ static int tmp401_init_client(struct tmp401_data *data) 
	config_orig = config;

	config &= ~TMP401_CONFIG_SHUTDOWN;



	if (of_property_read_bool(data->client->dev.of_node, "ti,extended-range-enable")) {

		/* Enable measurement over extended temperature range */

		config |= TMP401_CONFIG_RANGE;

	}



	data->extended_range = !!(config & TMP401_CONFIG_RANGE);



	if (config != config_orig)

	if (config != config_orig) {

		ret = regmap_write(regmap, TMP401_CONFIG, config);

		if (ret < 0)

			return ret;

	}



	ret = of_property_read_u32(data->client->dev.of_node, "ti,n-factor", &nfactor);

	if (!ret) {

		if (data->kind == tmp401) {

			dev_err(&data->client->dev, "ti,tmp401 does not support n-factor correction\n");

			return -EINVAL;

		}

		if (nfactor < -128 || nfactor > 127) {

			dev_err(&data->client->dev, "n-factor is invalid (%d)\n", nfactor);

			return -EINVAL;

		}

		ret = regmap_write(regmap, TMP4XX_N_FACTOR_REG, (unsigned int)nfactor);

		if (ret < 0)

			return ret;

	}



	ret = of_property_read_u32(data->client->dev.of_node, "ti,beta-compensation", &val);

	if (!ret) {

		if (data->kind == tmp401 || data->kind == tmp411) {

			dev_err(&data->client->dev, "ti,tmp401 or ti,tmp411 does not support beta compensation\n");

			return -EINVAL;

		}

		if (val > 15) {

			dev_err(&data->client->dev, "beta-compensation is invalid (%u)\n", val);

			return -EINVAL;

		}

		ret = regmap_write(regmap, TMP43X_BETA_RANGE, val);

		if (ret < 0)

			return ret;

	}



	return ret;

}