On Sun, Apr 24, 2016 at 6:52 AM, Akinobu Mita <akinobu.mita@xxxxxxxxx> wrote:
> 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@xxxxxxxxx>
> Cc: Vlad Dogaru <vlad.dogaru@xxxxxxxxx>
> Cc: Christoph Mair <christoph.mair@xxxxxxxxx>
> Cc: Jonathan Cameron <jic23@xxxxxxxxxx>
> Cc: Hartmut Knaack <knaack.h@xxxxxx>
> Cc: Lars-Peter Clausen <lars@xxxxxxxxxx>
> Cc: Peter Meerwald <pmeerw@xxxxxxxxxx>
> ---
> * v3
> - fix oversampling register setting for bmp280, spotted by Vlad Dogaru
>
> drivers/iio/pressure/bmp280.c | 203 ++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 185 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/iio/pressure/bmp280.c b/drivers/iio/pressure/bmp280.c
> index dcf3b0a..2f1498e 100644
> --- a/drivers/iio/pressure/bmp280.c
> +++ b/drivers/iio/pressure/bmp280.c
> @@ -48,19 +48,21 @@
>
> #define BMP280_OSRS_TEMP_MASK (BIT(7) | BIT(6) | BIT(5))
> #define BMP280_OSRS_TEMP_SKIP 0
> -#define BMP280_OSRS_TEMP_1X BIT(5)
> -#define BMP280_OSRS_TEMP_2X BIT(6)
> -#define BMP280_OSRS_TEMP_4X (BIT(6) | BIT(5))
> -#define BMP280_OSRS_TEMP_8X BIT(7)
> -#define BMP280_OSRS_TEMP_16X (BIT(7) | BIT(5))
> +#define BMP280_OSRS_TEMP_X(osrs_t) ((osrs_t) << 5)
> +#define BMP280_OSRS_TEMP_1X BMP280_OSRS_TEMP_X(1)
> +#define BMP280_OSRS_TEMP_2X BMP280_OSRS_TEMP_X(2)
> +#define BMP280_OSRS_TEMP_4X BMP280_OSRS_TEMP_X(3)
> +#define BMP280_OSRS_TEMP_8X BMP280_OSRS_TEMP_X(4)
> +#define BMP280_OSRS_TEMP_16X BMP280_OSRS_TEMP_X(5)
>
> #define BMP280_OSRS_PRESS_MASK (BIT(4) | BIT(3) | BIT(2))
> #define BMP280_OSRS_PRESS_SKIP 0
> -#define BMP280_OSRS_PRESS_1X BIT(2)
> -#define BMP280_OSRS_PRESS_2X BIT(3)
> -#define BMP280_OSRS_PRESS_4X (BIT(3) | BIT(2))
> -#define BMP280_OSRS_PRESS_8X BIT(4)
> -#define BMP280_OSRS_PRESS_16X (BIT(4) | BIT(2))
> +#define BMP280_OSRS_PRESS_X(osrs_p) ((osrs_p) << 2)
> +#define BMP280_OSRS_PRESS_1X BMP280_OSRS_PRESS_X(1)
> +#define BMP280_OSRS_PRESS_2X BMP280_OSRS_PRESS_X(2)
> +#define BMP280_OSRS_PRESS_4X BMP280_OSRS_PRESS_X(3)
> +#define BMP280_OSRS_PRESS_8X BMP280_OSRS_PRESS_X(4)
> +#define BMP280_OSRS_PRESS_16X BMP280_OSRS_PRESS_X(5)
>
> #define BMP280_MODE_MASK (BIT(1) | BIT(0))
> #define BMP280_MODE_SLEEP 0
> @@ -98,6 +100,10 @@ struct bmp280_data {
> struct regmap *regmap;
> const struct bmp280_chip_info *chip_info;
>
> + /* log of base 2 of oversampling rate */
> + u8 oversampling_press;
> + u8 oversampling_temp;
> +
> /*
> * Carryover value from temperature conversion, used in pressure
> * calculation.
> @@ -108,6 +114,12 @@ struct bmp280_data {
> struct bmp280_chip_info {
> const struct regmap_config *regmap_config;
>
> + const int *oversampling_temp_avail;
> + int num_oversampling_temp_avail;
> +
> + const int *oversampling_press_avail;
> + int num_oversampling_press_avail;
You declare oversampling_press_avail and num_ oversampling_press_avail twice!
> +
> int (*chip_config)(struct bmp280_data *);
> int (*read_temp)(struct bmp280_data *, int *);
> int (*read_press)(struct bmp280_data *, int *, int *);
> @@ -123,11 +135,13 @@ enum { P1, P2, P3, P4, P5, P6, P7, P8, P9 };
> static const struct iio_chan_spec bmp280_channels[] = {
> {
> .type = IIO_PRESSURE,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
> + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
> + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
> },
> {
> .type = IIO_TEMP,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
> + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
> + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
> },
> };
>
> @@ -333,6 +347,21 @@ static int bmp280_read_raw(struct iio_dev *indio_dev,
> break;
> }
> break;
> + case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> + switch (chan->type) {
> + case IIO_PRESSURE:
> + *val = 1 << data->oversampling_press;
> + ret = IIO_VAL_INT;
> + break;
> + case IIO_TEMP:
> + *val = 1 << data->oversampling_temp;
> + ret = IIO_VAL_INT;
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> + break;
> default:
> ret = -EINVAL;
> break;
> @@ -343,22 +372,135 @@ static int bmp280_read_raw(struct iio_dev *indio_dev,
> return ret;
> }
>
> +static int bmp280_write_oversampling_ratio_temp(struct bmp280_data *data,
> + int val)
> +{
> + int i;
> + const int *avail = data->chip_info->oversampling_temp_avail;
> + const int n = data->chip_info->num_oversampling_temp_avail;
> +
> + for (i = 0; i < n; i++) {
> + if (avail[i] == val) {
> + data->oversampling_temp = ilog2(val);
> +
> + return data->chip_info->chip_config(data);
> + }
> + }
> + return -EINVAL;
> +}
> +
> +static int bmp280_write_oversampling_ratio_press(struct bmp280_data *data,
> + int val)
> +{
> + int i;
> + const int *avail = data->chip_info->oversampling_press_avail;
> + const int n = data->chip_info->num_oversampling_press_avail;
> +
> + for (i = 0; i < n; i++) {
> + if (avail[i] == val) {
> + data->oversampling_press = ilog2(val);
> +
> + return data->chip_info->chip_config(data);
> + }
> + }
> + return -EINVAL;
> +}
> +
> +static int bmp280_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + int ret = 0;
> + struct bmp280_data *data = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> + mutex_lock(&data->lock);
> + switch (chan->type) {
> + case IIO_PRESSURE:
> + ret = bmp280_write_oversampling_ratio_press(data, val);
> + break;
> + case IIO_TEMP:
> + ret = bmp280_write_oversampling_ratio_temp(data, val);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> + mutex_unlock(&data->lock);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return ret;
> +}
> +
> +static ssize_t bmp280_show_avail(char *buf, const int *vals, const int n)
> +{
> + size_t len = 0;
> + int i;
> +
> + for (i = 0; i < n; i++)
> + len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", vals[i]);
> +
> + buf[len - 1] = '\n';
> +
> + return len;
> +}
> +
> +static ssize_t bmp280_show_temp_oversampling_avail(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
> +
> + return bmp280_show_avail(buf, data->chip_info->oversampling_temp_avail,
> + data->chip_info->num_oversampling_temp_avail);
> +}
> +
> +static ssize_t bmp280_show_press_oversampling_avail(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
> +
> + return bmp280_show_avail(buf, data->chip_info->oversampling_press_avail,
> + data->chip_info->num_oversampling_press_avail);
> +}
> +
> +static IIO_DEVICE_ATTR(in_temp_oversampling_ratio_available,
> + S_IRUGO, bmp280_show_temp_oversampling_avail, NULL, 0);
> +
> +static IIO_DEVICE_ATTR(in_pressure_oversampling_ratio_available,
> + S_IRUGO, bmp280_show_press_oversampling_avail, NULL, 0);
> +
> +static struct attribute *bmp280_attributes[] = {
> + &iio_dev_attr_in_temp_oversampling_ratio_available.dev_attr.attr,
> + &iio_dev_attr_in_pressure_oversampling_ratio_available.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group bmp280_attrs_group = {
> + .attrs = bmp280_attributes,
> +};
> +
> static const struct iio_info bmp280_info = {
> .driver_module = THIS_MODULE,
> .read_raw = &bmp280_read_raw,
> + .write_raw = &bmp280_write_raw,
> + .attrs = &bmp280_attrs_group,
> };
>
> static int bmp280_chip_config(struct bmp280_data *data)
> {
> int ret;
> + u8 osrs = BMP280_OSRS_TEMP_X(data->oversampling_temp + 1) |
> + BMP280_OSRS_PRESS_X(data->oversampling_press + 1);
>
> ret = regmap_update_bits(data->regmap, BMP280_REG_CTRL_MEAS,
> BMP280_OSRS_TEMP_MASK |
> BMP280_OSRS_PRESS_MASK |
> BMP280_MODE_MASK,
> - BMP280_OSRS_TEMP_2X |
> - BMP280_OSRS_PRESS_16X |
> - BMP280_MODE_NORMAL);
> + osrs | BMP280_MODE_NORMAL);
> if (ret < 0) {
> dev_err(&data->client->dev,
> "failed to write ctrl_meas register\n");
> @@ -377,8 +519,17 @@ static int bmp280_chip_config(struct bmp280_data *data)
> return ret;
> }
>
> +static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
> +
> static const struct bmp280_chip_info bmp280_chip_info = {
> .regmap_config = &bmp280_regmap_config,
> +
> + .oversampling_temp_avail = bmp280_oversampling_avail,
> + .num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
> +
> + .oversampling_press_avail = bmp280_oversampling_avail,
> + .num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
> +
> .chip_config = bmp280_chip_config,
> .read_temp = bmp280_read_temp,
> .read_press = bmp280_read_press,
> @@ -433,7 +584,7 @@ static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
> if (ctrl_meas == BMP180_MEAS_TEMP)
> delay_us = 4500;
> else
> - delay_us = conversion_time_max[ilog2(8)];
> + delay_us = conversion_time_max[data->oversampling_press];
>
> usleep_range(delay_us, delay_us + 1000);
>
> @@ -573,7 +724,7 @@ static int bmp180_read_adc_press(struct bmp280_data *data, int *val)
> {
> int ret;
> __be32 tmp = 0;
> - u8 oss = ilog2(8);
> + u8 oss = data->oversampling_press;
>
> ret = bmp180_measure(data, BMP180_MEAS_PRESS_X(oss));
> if (ret)
> @@ -599,7 +750,7 @@ static u32 bmp180_compensate_press(struct bmp280_data *data, s32 adc_press)
> s32 x1, x2, x3, p;
> s32 b3, b6;
> u32 b4, b7;
> - s32 oss = ilog2(8);
> + s32 oss = data->oversampling_press;
> struct bmp180_calib calib;
>
> ret = bmp180_read_calib(data, &calib);
> @@ -660,8 +811,20 @@ static int bmp180_chip_config(struct bmp280_data *data)
> return 0;
> }
>
> +static const int bmp180_oversampling_temp_avail[] = { 1 };
> +static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
> +
> static const struct bmp280_chip_info bmp180_chip_info = {
> .regmap_config = &bmp180_regmap_config,
> +
> + .oversampling_temp_avail = bmp180_oversampling_temp_avail,
> + .num_oversampling_temp_avail =
> + ARRAY_SIZE(bmp180_oversampling_temp_avail),
> +
> + .oversampling_press_avail = bmp180_oversampling_press_avail,
> + .num_oversampling_press_avail =
> + ARRAY_SIZE(bmp180_oversampling_press_avail),
> +
> .chip_config = bmp180_chip_config,
> .read_temp = bmp180_read_temp,
> .read_press = bmp180_read_press,
> @@ -693,9 +856,13 @@ static int bmp280_probe(struct i2c_client *client,
> switch (id->driver_data) {
> case BMP180_CHIP_ID:
> data->chip_info = &bmp180_chip_info;
> + data->oversampling_press = ilog2(8);
> + data->oversampling_temp = ilog2(1);
> break;
> case BMP280_CHIP_ID:
> data->chip_info = &bmp280_chip_info;
> + data->oversampling_press = ilog2(16);
> + data->oversampling_temp = ilog2(2);
> break;
> default:
> return -EINVAL;
> --
> 2.5.0
>
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