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hwmon: (tmp401) Add support of three advanced features

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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: Camel Guo <camel.guo@axis.com>
Link: https://lore.kernel.org/r/20220414075824.2634839-3-camel.guo@axis.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Camel Guo 2022-04-14 09:58:23 +02:00 committed by Guenter Roeck
parent bd90c5b939
commit bd79021072
1 changed files with 43 additions and 1 deletions
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44
drivers/hwmon/tmp401.c
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@ -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;
}