iio: pressure: bmp280: add ability to control oversampling rate
This adds ability to control the oversampling ratio of the temperature and pressure measurement for both bmp180 and bmp280. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: Vlad Dogaru <vlad.dogaru@intel.com> Cc: Christoph Mair <christoph.mair@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Akinobu Mita
Jonathan Cameron
parent
6dba72eca7
commit
62979904b0
1 changed files with 185 additions and 18 deletions
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@ -48,19 +48,21 @@
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#define BMP280_OSRS_TEMP_MASK (BIT(7) | BIT(6) | BIT(5))
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#define BMP280_OSRS_TEMP_SKIP 0
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#define BMP280_OSRS_TEMP_1X BIT(5)
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#define BMP280_OSRS_TEMP_2X BIT(6)
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#define BMP280_OSRS_TEMP_4X (BIT(6) | BIT(5))
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#define BMP280_OSRS_TEMP_8X BIT(7)
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#define BMP280_OSRS_TEMP_16X (BIT(7) | BIT(5))
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#define BMP280_OSRS_TEMP_X(osrs_t) ((osrs_t) << 5)
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#define BMP280_OSRS_TEMP_1X BMP280_OSRS_TEMP_X(1)
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#define BMP280_OSRS_TEMP_2X BMP280_OSRS_TEMP_X(2)
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#define BMP280_OSRS_TEMP_4X BMP280_OSRS_TEMP_X(3)
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#define BMP280_OSRS_TEMP_8X BMP280_OSRS_TEMP_X(4)
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#define BMP280_OSRS_TEMP_16X BMP280_OSRS_TEMP_X(5)
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#define BMP280_OSRS_PRESS_MASK (BIT(4) | BIT(3) | BIT(2))
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#define BMP280_OSRS_PRESS_SKIP 0
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#define BMP280_OSRS_PRESS_1X BIT(2)
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#define BMP280_OSRS_PRESS_2X BIT(3)
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#define BMP280_OSRS_PRESS_4X (BIT(3) | BIT(2))
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#define BMP280_OSRS_PRESS_8X BIT(4)
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#define BMP280_OSRS_PRESS_16X (BIT(4) | BIT(2))
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#define BMP280_OSRS_PRESS_X(osrs_p) ((osrs_p) << 2)
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#define BMP280_OSRS_PRESS_1X BMP280_OSRS_PRESS_X(1)
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#define BMP280_OSRS_PRESS_2X BMP280_OSRS_PRESS_X(2)
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#define BMP280_OSRS_PRESS_4X BMP280_OSRS_PRESS_X(3)
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#define BMP280_OSRS_PRESS_8X BMP280_OSRS_PRESS_X(4)
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#define BMP280_OSRS_PRESS_16X BMP280_OSRS_PRESS_X(5)
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#define BMP280_MODE_MASK (BIT(1) | BIT(0))
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#define BMP280_MODE_SLEEP 0
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@ -98,6 +100,10 @@ struct bmp280_data {
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struct regmap *regmap;
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const struct bmp280_chip_info *chip_info;
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/* log of base 2 of oversampling rate */
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u8 oversampling_press;
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u8 oversampling_temp;
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/*
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* Carryover value from temperature conversion, used in pressure
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* calculation.
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@ -108,6 +114,12 @@ struct bmp280_data {
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struct bmp280_chip_info {
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const struct regmap_config *regmap_config;
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const int *oversampling_temp_avail;
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int num_oversampling_temp_avail;
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const int *oversampling_press_avail;
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int num_oversampling_press_avail;
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int (*chip_config)(struct bmp280_data *);
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int (*read_temp)(struct bmp280_data *, int *);
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int (*read_press)(struct bmp280_data *, int *, int *);
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@ -123,11 +135,13 @@ enum { P1, P2, P3, P4, P5, P6, P7, P8, P9 };
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static const struct iio_chan_spec bmp280_channels[] = {
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{
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.type = IIO_PRESSURE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
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},
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
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},
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};
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@ -333,6 +347,21 @@ static int bmp280_read_raw(struct iio_dev *indio_dev,
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break;
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}
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break;
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case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
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switch (chan->type) {
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case IIO_PRESSURE:
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*val = 1 << data->oversampling_press;
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ret = IIO_VAL_INT;
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break;
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case IIO_TEMP:
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*val = 1 << data->oversampling_temp;
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ret = IIO_VAL_INT;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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break;
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default:
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ret = -EINVAL;
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break;
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@ -343,22 +372,135 @@ static int bmp280_read_raw(struct iio_dev *indio_dev,
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return ret;
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}
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static int bmp280_write_oversampling_ratio_temp(struct bmp280_data *data,
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int val)
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{
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int i;
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const int *avail = data->chip_info->oversampling_temp_avail;
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const int n = data->chip_info->num_oversampling_temp_avail;
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for (i = 0; i < n; i++) {
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if (avail[i] == val) {
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data->oversampling_temp = ilog2(val);
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return data->chip_info->chip_config(data);
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}
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}
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return -EINVAL;
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}
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static int bmp280_write_oversampling_ratio_press(struct bmp280_data *data,
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int val)
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{
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int i;
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const int *avail = data->chip_info->oversampling_press_avail;
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const int n = data->chip_info->num_oversampling_press_avail;
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for (i = 0; i < n; i++) {
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if (avail[i] == val) {
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data->oversampling_press = ilog2(val);
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return data->chip_info->chip_config(data);
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}
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}
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return -EINVAL;
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}
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static int bmp280_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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int ret = 0;
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struct bmp280_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
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mutex_lock(&data->lock);
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switch (chan->type) {
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case IIO_PRESSURE:
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ret = bmp280_write_oversampling_ratio_press(data, val);
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break;
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case IIO_TEMP:
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ret = bmp280_write_oversampling_ratio_temp(data, val);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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mutex_unlock(&data->lock);
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break;
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default:
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return -EINVAL;
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}
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return ret;
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}
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static ssize_t bmp280_show_avail(char *buf, const int *vals, const int n)
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{
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size_t len = 0;
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int i;
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for (i = 0; i < n; i++)
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len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", vals[i]);
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buf[len - 1] = '\n';
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return len;
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}
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static ssize_t bmp280_show_temp_oversampling_avail(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
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return bmp280_show_avail(buf, data->chip_info->oversampling_temp_avail,
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data->chip_info->num_oversampling_temp_avail);
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}
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static ssize_t bmp280_show_press_oversampling_avail(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
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return bmp280_show_avail(buf, data->chip_info->oversampling_press_avail,
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data->chip_info->num_oversampling_press_avail);
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}
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static IIO_DEVICE_ATTR(in_temp_oversampling_ratio_available,
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S_IRUGO, bmp280_show_temp_oversampling_avail, NULL, 0);
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static IIO_DEVICE_ATTR(in_pressure_oversampling_ratio_available,
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S_IRUGO, bmp280_show_press_oversampling_avail, NULL, 0);
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static struct attribute *bmp280_attributes[] = {
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&iio_dev_attr_in_temp_oversampling_ratio_available.dev_attr.attr,
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&iio_dev_attr_in_pressure_oversampling_ratio_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group bmp280_attrs_group = {
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.attrs = bmp280_attributes,
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};
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static const struct iio_info bmp280_info = {
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.driver_module = THIS_MODULE,
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.read_raw = &bmp280_read_raw,
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.write_raw = &bmp280_write_raw,
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.attrs = &bmp280_attrs_group,
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};
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static int bmp280_chip_config(struct bmp280_data *data)
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{
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int ret;
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u8 osrs = BMP280_OSRS_TEMP_X(data->oversampling_temp + 1) |
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BMP280_OSRS_PRESS_X(data->oversampling_press + 1);
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ret = regmap_update_bits(data->regmap, BMP280_REG_CTRL_MEAS,
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BMP280_OSRS_TEMP_MASK |
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BMP280_OSRS_PRESS_MASK |
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BMP280_MODE_MASK,
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BMP280_OSRS_TEMP_2X |
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BMP280_OSRS_PRESS_16X |
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BMP280_MODE_NORMAL);
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osrs | BMP280_MODE_NORMAL);
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if (ret < 0) {
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dev_err(&data->client->dev,
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"failed to write ctrl_meas register\n");
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@ -377,8 +519,17 @@ static int bmp280_chip_config(struct bmp280_data *data)
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return ret;
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}
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static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
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static const struct bmp280_chip_info bmp280_chip_info = {
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.regmap_config = &bmp280_regmap_config,
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.oversampling_temp_avail = bmp280_oversampling_avail,
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.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
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.oversampling_press_avail = bmp280_oversampling_avail,
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.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
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.chip_config = bmp280_chip_config,
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.read_temp = bmp280_read_temp,
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.read_press = bmp280_read_press,
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@ -433,7 +584,7 @@ static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
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if (ctrl_meas == BMP180_MEAS_TEMP)
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delay_us = 4500;
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else
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delay_us = conversion_time_max[ilog2(8)];
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delay_us = conversion_time_max[data->oversampling_press];
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usleep_range(delay_us, delay_us + 1000);
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@ -573,7 +724,7 @@ static int bmp180_read_adc_press(struct bmp280_data *data, int *val)
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{
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int ret;
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__be32 tmp = 0;
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u8 oss = ilog2(8);
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u8 oss = data->oversampling_press;
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ret = bmp180_measure(data, BMP180_MEAS_PRESS_X(oss));
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if (ret)
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@ -599,7 +750,7 @@ static u32 bmp180_compensate_press(struct bmp280_data *data, s32 adc_press)
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s32 x1, x2, x3, p;
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s32 b3, b6;
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u32 b4, b7;
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s32 oss = ilog2(8);
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s32 oss = data->oversampling_press;
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struct bmp180_calib calib;
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ret = bmp180_read_calib(data, &calib);
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@ -660,8 +811,20 @@ static int bmp180_chip_config(struct bmp280_data *data)
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return 0;
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}
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static const int bmp180_oversampling_temp_avail[] = { 1 };
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static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
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static const struct bmp280_chip_info bmp180_chip_info = {
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.regmap_config = &bmp180_regmap_config,
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.oversampling_temp_avail = bmp180_oversampling_temp_avail,
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.num_oversampling_temp_avail =
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ARRAY_SIZE(bmp180_oversampling_temp_avail),
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.oversampling_press_avail = bmp180_oversampling_press_avail,
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.num_oversampling_press_avail =
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ARRAY_SIZE(bmp180_oversampling_press_avail),
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.chip_config = bmp180_chip_config,
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.read_temp = bmp180_read_temp,
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.read_press = bmp180_read_press,
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@ -693,9 +856,13 @@ static int bmp280_probe(struct i2c_client *client,
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switch (id->driver_data) {
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case BMP180_CHIP_ID:
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data->chip_info = &bmp180_chip_info;
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data->oversampling_press = ilog2(8);
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data->oversampling_temp = ilog2(1);
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break;
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case BMP280_CHIP_ID:
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data->chip_info = &bmp280_chip_info;
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data->oversampling_press = ilog2(16);
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data->oversampling_temp = ilog2(2);
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break;
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default:
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return -EINVAL;
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