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@xxxxxxxx>
---
Notes:
v4: no change
v3:
- Instead of u32, use s32 for ti,n-factor.
v2: no change
drivers/hwmon/tmp401.c | 44 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 43 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/tmp401.c b/drivers/hwmon/tmp401.c
index b86d9df7105d..8f49da997367 100644
--- a/drivers/hwmon/tmp401.c
+++ b/drivers/hwmon/tmp401.c
@@ -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;
}
--
2.30.2
