From d314b891272abaad7d1c9bf4caadb97023ee9721 Mon Sep 17 00:00:00 2001 From: Jean-Baptiste Maneyrol Date: Tue, 26 Nov 2019 17:19:12 +0100 Subject: [PATCH] iio: imu: inv_mpu6050: fix temperature reporting using bad unit commit 53eaa9c27fdc01b4f4d885223e29f97393409e7e upstream. Temperature should be reported in milli-degrees, not degrees. Fix scale and offset values to use the correct unit. This is a fix for an issue that has been present for a long time. The fixes tag reflects the point at which the code last changed in a fashion that would make this fix patch no longer apply. Backports will be necessary to fix those elements that predate that patch. Fixes: 1615fe41a195 ("iio: imu: mpu6050: Fix FIFO layout for ICM20602") Cc: stable@vger.kernel.org Signed-off-by: Jean-Baptiste Maneyrol Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 23 +++++++++++----------- drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h | 16 +++++++++++---- 2 files changed, 24 insertions(+), 15 deletions(-) diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c index 868281b8adb0..2261c6c4ac65 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c @@ -115,6 +115,7 @@ static const struct inv_mpu6050_hw hw_info[] = { .reg = ®_set_6050, .config = &chip_config_6050, .fifo_size = 1024, + .temp = {INV_MPU6050_TEMP_OFFSET, INV_MPU6050_TEMP_SCALE}, }, { .whoami = INV_MPU6500_WHOAMI_VALUE, @@ -122,6 +123,7 @@ static const struct inv_mpu6050_hw hw_info[] = { .reg = ®_set_6500, .config = &chip_config_6050, .fifo_size = 512, + .temp = {INV_MPU6500_TEMP_OFFSET, INV_MPU6500_TEMP_SCALE}, }, { .whoami = INV_MPU6515_WHOAMI_VALUE, @@ -129,6 +131,7 @@ static const struct inv_mpu6050_hw hw_info[] = { .reg = ®_set_6500, .config = &chip_config_6050, .fifo_size = 512, + .temp = {INV_MPU6500_TEMP_OFFSET, INV_MPU6500_TEMP_SCALE}, }, { .whoami = INV_MPU6000_WHOAMI_VALUE, @@ -136,6 +139,7 @@ static const struct inv_mpu6050_hw hw_info[] = { .reg = ®_set_6050, .config = &chip_config_6050, .fifo_size = 1024, + .temp = {INV_MPU6050_TEMP_OFFSET, INV_MPU6050_TEMP_SCALE}, }, { .whoami = INV_MPU9150_WHOAMI_VALUE, @@ -143,6 +147,7 @@ static const struct inv_mpu6050_hw hw_info[] = { .reg = ®_set_6050, .config = &chip_config_6050, .fifo_size = 1024, + .temp = {INV_MPU6050_TEMP_OFFSET, INV_MPU6050_TEMP_SCALE}, }, { .whoami = INV_MPU9250_WHOAMI_VALUE, @@ -150,6 +155,7 @@ static const struct inv_mpu6050_hw hw_info[] = { .reg = ®_set_6500, .config = &chip_config_6050, .fifo_size = 512, + .temp = {INV_MPU6500_TEMP_OFFSET, INV_MPU6500_TEMP_SCALE}, }, { .whoami = INV_MPU9255_WHOAMI_VALUE, @@ -157,6 +163,7 @@ static const struct inv_mpu6050_hw hw_info[] = { .reg = ®_set_6500, .config = &chip_config_6050, .fifo_size = 512, + .temp = {INV_MPU6500_TEMP_OFFSET, INV_MPU6500_TEMP_SCALE}, }, { .whoami = INV_ICM20608_WHOAMI_VALUE, @@ -164,6 +171,7 @@ static const struct inv_mpu6050_hw hw_info[] = { .reg = ®_set_6500, .config = &chip_config_6050, .fifo_size = 512, + .temp = {INV_ICM20608_TEMP_OFFSET, INV_ICM20608_TEMP_SCALE}, }, { .whoami = INV_ICM20602_WHOAMI_VALUE, @@ -171,6 +179,7 @@ static const struct inv_mpu6050_hw hw_info[] = { .reg = ®_set_icm20602, .config = &chip_config_6050, .fifo_size = 1008, + .temp = {INV_ICM20608_TEMP_OFFSET, INV_ICM20608_TEMP_SCALE}, }, }; @@ -471,12 +480,8 @@ inv_mpu6050_read_raw(struct iio_dev *indio_dev, return IIO_VAL_INT_PLUS_MICRO; case IIO_TEMP: - *val = 0; - if (st->chip_type == INV_ICM20602) - *val2 = INV_ICM20602_TEMP_SCALE; - else - *val2 = INV_MPU6050_TEMP_SCALE; - + *val = st->hw->temp.scale / 1000000; + *val2 = st->hw->temp.scale % 1000000; return IIO_VAL_INT_PLUS_MICRO; default: return -EINVAL; @@ -484,11 +489,7 @@ inv_mpu6050_read_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_OFFSET: switch (chan->type) { case IIO_TEMP: - if (st->chip_type == INV_ICM20602) - *val = INV_ICM20602_TEMP_OFFSET; - else - *val = INV_MPU6050_TEMP_OFFSET; - + *val = st->hw->temp.offset; return IIO_VAL_INT; default: return -EINVAL; diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h index 51235677c534..c32bd0c012b5 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h @@ -101,6 +101,7 @@ struct inv_mpu6050_chip_config { * @reg: register map of the chip. * @config: configuration of the chip. * @fifo_size: size of the FIFO in bytes. + * @temp: offset and scale to apply to raw temperature. */ struct inv_mpu6050_hw { u8 whoami; @@ -108,6 +109,10 @@ struct inv_mpu6050_hw { const struct inv_mpu6050_reg_map *reg; const struct inv_mpu6050_chip_config *config; size_t fifo_size; + struct { + int offset; + int scale; + } temp; }; /* @@ -218,16 +223,19 @@ struct inv_mpu6050_state { #define INV_MPU6050_REG_UP_TIME_MIN 5000 #define INV_MPU6050_REG_UP_TIME_MAX 10000 -#define INV_MPU6050_TEMP_OFFSET 12421 -#define INV_MPU6050_TEMP_SCALE 2941 +#define INV_MPU6050_TEMP_OFFSET 12420 +#define INV_MPU6050_TEMP_SCALE 2941176 #define INV_MPU6050_MAX_GYRO_FS_PARAM 3 #define INV_MPU6050_MAX_ACCL_FS_PARAM 3 #define INV_MPU6050_THREE_AXIS 3 #define INV_MPU6050_GYRO_CONFIG_FSR_SHIFT 3 #define INV_MPU6050_ACCL_CONFIG_FSR_SHIFT 3 -#define INV_ICM20602_TEMP_OFFSET 8170 -#define INV_ICM20602_TEMP_SCALE 3060 +#define INV_MPU6500_TEMP_OFFSET 7011 +#define INV_MPU6500_TEMP_SCALE 2995178 + +#define INV_ICM20608_TEMP_OFFSET 8170 +#define INV_ICM20608_TEMP_SCALE 3059976 /* 6 + 6 round up and plus 8 */ #define INV_MPU6050_OUTPUT_DATA_SIZE 24