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driver: bmi160: Add temperature sensor

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Allow BMI160 to report temperature like other device with a temperature
sensor.
Temparature is returned in K. Although BMI160 resolution is 9bits per
degree, we round to the nearest degree.

BUG=chrome-os-partner:58894
BRANCH=reef
TEST=After enabling sensor on Reef, check we can measure the temperature
with EC console commands temp or from user space with 'ectool temps 3'
Check 'ectool tempsinfo 3' returns valid data:
Sensor name: Gyro
Sensor type: 1

Change-Id: Ib48f988e078cdee1dfbc05b23df806bd4eb09931
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/416297
Reviewed-by: Scott Collyer <scollyer@chromium.org>
This commit is contained in:
Gwendal Grignou
2016-12-02 15:20:20 -08:00
committed by chrome-bot
parent f50b1cec17
commit e2e875c566
2 changed files with 19 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
driver/accelgyro_bmi160.c
View File

@@ -1261,3 +1261,19 @@ struct i2c_stress_test_dev bmi160_i2c_stress_test_dev = {
.i2c_write = &raw_write8,
};
#endif /* CONFIG_CMD_I2C_STRESS_TEST_ACCEL */
int bmi160_get_sensor_temp(int idx, int *temp_ptr)
{
struct motion_sensor_t *s = &motion_sensors[idx];
int16_t temp;
int ret;
ret = raw_read_n(s->port, s->addr, BMI160_TEMPERATURE_0,
(uint8_t *)&temp, sizeof(temp));
if (ret || temp == BMI160_INVALID_TEMP)
return EC_ERROR_NOT_POWERED;
*temp_ptr = C_TO_K(23 + ((temp + 256) >> 9));
return 0;
}

3
driver/accelgyro_bmi160.h
View File

@@ -127,6 +127,8 @@
#define BMI160_TEMPERATURE_0 0x20
#define BMI160_TEMPERATURE_1 0x21
#define BMI160_INVALID_TEMP 0x8000
#define BMI160_FIFO_LENGTH_0 0x22
#define BMI160_FIFO_LENGTH_1 0x23
@@ -463,4 +465,5 @@ int raw_mag_write8(const int port, const int addr, const uint8_t reg, int data);
extern struct i2c_stress_test_dev bmi160_i2c_stress_test_dev;
#endif
int bmi160_get_sensor_temp(int idx, int *temp_ptr);
#endif /* __CROS_EC_ACCELGYRO_BMI160_H */