iio: dps310: Temperature measurement errata (cc8baffe) · Commits · 戴 / test

drivers/iio/pressure/dps310.c

+50 −2

Original line number	Diff line number	Diff line
		@@ -53,7 +53,6 @@
		#define DPS310_RESET 0x0c
		#define DPS310_RESET_MAGIC 0x09
		#define DPS310_COEF_BASE 0x10
		#define DPS310_COEF_SRC 0x28

		/* Make sure sleep time is <= 20ms for usleep_range */
		#define DPS310_POLL_SLEEP_US(t) min(20000, (t) / 8)
		@@ -234,6 +233,10 @@ static bool dps310_is_writeable_reg(struct device *dev, unsigned int reg)
		case DPS310_MEAS_CFG:
		case DPS310_CFG_REG:
		case DPS310_RESET:
		/* No documentation available on the registers below */
		case 0x0e:
		case 0x0f:
		case 0x62:
		return true;
		default:
		return false;
		@@ -250,6 +253,7 @@ static bool dps310_is_volatile_reg(struct device *dev, unsigned int reg)
		case DPS310_TMP_B1:
		case DPS310_TMP_B2:
		case DPS310_MEAS_CFG:
		case 0x32: /* No documentation available on this register */
		return true;
		default:
		return false;
		@@ -360,7 +364,7 @@ static const struct regmap_config dps310_regmap_config = {
		.writeable_reg = dps310_is_writeable_reg,
		.volatile_reg = dps310_is_volatile_reg,
		.cache_type = REGCACHE_RBTREE,
		.max_register = DPS310_COEF_SRC,
		.max_register = 0x62, /* No documentation available on this register */
		};

		static const struct iio_info dps310_info = {
		@@ -368,6 +372,46 @@ static const struct iio_info dps310_info = {
		.write_raw = dps310_write_raw,
		};

		/*
		* Some verions of chip will read temperatures in the ~60C range when
		* its actually ~20C. This is the manufacturer recommended workaround
		* to correct the issue. The registers used below are undocumented.
		*/
		static int dps310_temp_workaround(struct dps310_data *data)
		{
		int rc;
		int reg;

		rc = regmap_read(data->regmap, 0x32, &reg);
		if (rc < 0)
		return rc;

		/*
		* If bit 1 is set then the device is okay, and the workaround does not
		* need to be applied
		*/
		if (reg & BIT(1))
		return 0;

		rc = regmap_write(data->regmap, 0x0e, 0xA5);
		if (rc < 0)
		return rc;

		rc = regmap_write(data->regmap, 0x0f, 0x96);
		if (rc < 0)
		return rc;

		rc = regmap_write(data->regmap, 0x62, 0x02);
		if (rc < 0)
		return rc;

		rc = regmap_write(data->regmap, 0x0e, 0x00);
		if (rc < 0)
		return rc;

		return regmap_write(data->regmap, 0x0f, 0x00);
		}

		static int dps310_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		@@ -439,6 +483,10 @@ static int dps310_probe(struct i2c_client *client,
		if (rc < 0)
		return rc;

		rc = dps310_temp_workaround(data);
		if (rc < 0)
		return rc;

		rc = devm_iio_device_register(&client->dev, iio);
		if (rc)
		return rc;

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