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| author | Jean-Baptiste Maneyrol | 2018-05-22 16:18:19 +0200 |
|---|---|---|
| committer | Jonathan Cameron | 2018-06-10 12:52:29 +0200 |
| commit | 7b782508f829d39f30a80250935974e8f77c173a (patch) | |
| tree | 7b21b5e4bb8b501bebd2445e5342aa18fccd43cc /drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | |
| parent | iio: imu: inv_mpu6050: replace timestamp fifo by generic timestamp (diff) | |
| download | kernel-qcow2-linux-7b782508f829d39f30a80250935974e8f77c173a.tar.gz kernel-qcow2-linux-7b782508f829d39f30a80250935974e8f77c173a.tar.xz kernel-qcow2-linux-7b782508f829d39f30a80250935974e8f77c173a.zip | |
iio: imu: inv_mpu6050: switch to use sample rate divider
Instead of storing fifo rate in Hz, store the chip internal sample
rate divider. This will be more useful for timestamping. There
are both equivalent.
Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/imu/inv_mpu6050/inv_mpu_core.c')
| -rw-r--r-- | drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c index 08937a6d59db..f50477c360e2 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c @@ -82,7 +82,7 @@ static const struct inv_mpu6050_reg_map reg_set_6050 = { static const struct inv_mpu6050_chip_config chip_config_6050 = { .fsr = INV_MPU6050_FSR_2000DPS, .lpf = INV_MPU6050_FILTER_20HZ, - .fifo_rate = INV_MPU6050_INIT_FIFO_RATE, + .divider = INV_MPU6050_FIFO_RATE_TO_DIVIDER(INV_MPU6050_INIT_FIFO_RATE), .gyro_fifo_enable = false, .accl_fifo_enable = false, .accl_fs = INV_MPU6050_FS_02G, @@ -278,7 +278,7 @@ static int inv_mpu6050_init_config(struct iio_dev *indio_dev) if (result) goto error_power_off; - d = INV_MPU6050_ONE_K_HZ / INV_MPU6050_INIT_FIFO_RATE - 1; + d = INV_MPU6050_FIFO_RATE_TO_DIVIDER(INV_MPU6050_INIT_FIFO_RATE); result = regmap_write(st->map, st->reg->sample_rate_div, d); if (result) goto error_power_off; @@ -628,7 +628,7 @@ static ssize_t inv_mpu6050_fifo_rate_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - s32 fifo_rate; + int fifo_rate; u8 d; int result; struct iio_dev *indio_dev = dev_to_iio_dev(dev); @@ -644,8 +644,13 @@ inv_mpu6050_fifo_rate_store(struct device *dev, struct device_attribute *attr, if (result) return result; + /* compute the chip sample rate divider */ + d = INV_MPU6050_FIFO_RATE_TO_DIVIDER(fifo_rate); + /* compute back the fifo rate to handle truncation cases */ + fifo_rate = INV_MPU6050_DIVIDER_TO_FIFO_RATE(d); + mutex_lock(&st->lock); - if (fifo_rate == st->chip_config.fifo_rate) { + if (d == st->chip_config.divider) { result = 0; goto fifo_rate_fail_unlock; } @@ -653,11 +658,10 @@ inv_mpu6050_fifo_rate_store(struct device *dev, struct device_attribute *attr, if (result) goto fifo_rate_fail_unlock; - d = INV_MPU6050_ONE_K_HZ / fifo_rate - 1; result = regmap_write(st->map, st->reg->sample_rate_div, d); if (result) goto fifo_rate_fail_power_off; - st->chip_config.fifo_rate = fifo_rate; + st->chip_config.divider = d; result = inv_mpu6050_set_lpf(st, fifo_rate); if (result) @@ -685,7 +689,7 @@ inv_fifo_rate_show(struct device *dev, struct device_attribute *attr, unsigned fifo_rate; mutex_lock(&st->lock); - fifo_rate = st->chip_config.fifo_rate; + fifo_rate = INV_MPU6050_DIVIDER_TO_FIFO_RATE(st->chip_config.divider); mutex_unlock(&st->lock); return scnprintf(buf, PAGE_SIZE, "%u\n", fifo_rate); |