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SubjectRe: [PATCH 5/8] iio: accel: mma9553: refactor mma9553_read_raw
On 08/04/15 15:37, Irina Tirdea wrote:
> Refactor code for simplicity and clarity.
>
> Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
> Suggested-by: Hartmut Knaack <knaack.h@gmx.de>
A good refactor indeed.
Will pick up after series reorder and possibly waiting for the
fixes to propagate through to my upstream.

J
> ---
> drivers/iio/accel/mma9553.c | 100 +++++++++++++++-----------------------------
> 1 file changed, 33 insertions(+), 67 deletions(-)
>
> diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
> index ee2be3f..57868fb 100644
> --- a/drivers/iio/accel/mma9553.c
> +++ b/drivers/iio/accel/mma9553.c
> @@ -439,6 +439,32 @@ static int mma9553_init(struct mma9553_data *data)
> return mma9551_set_device_state(data->client, true);
> }
>
> +static int mma9553_read_status_word(struct mma9553_data *data, u16 reg,
> + u16 *tmp)
> +{
> + bool powered_on;
> + int ret;
> +
> + /*
> + * The HW only counts steps and other dependent
> + * parameters (speed, distance, calories, activity)
> + * if power is on (from enabling an event or the
> + * step counter).
> + */
> + powered_on = mma9553_is_any_event_enabled(data, false, 0) ||
> + data->stepcnt_enabled;
> + if (!powered_on) {
> + dev_err(&data->client->dev, "No channels enabled\n");
> + return -EINVAL;
> + }
> +
> + mutex_lock(&data->mutex);
> + ret = mma9551_read_status_word(data->client, MMA9551_APPID_PEDOMETER,
> + reg, tmp);
> + mutex_unlock(&data->mutex);
> + return ret;
> +}
> +
> static int mma9553_read_raw(struct iio_dev *indio_dev,
> struct iio_chan_spec const *chan,
> int *val, int *val2, long mask)
> @@ -447,69 +473,30 @@ static int mma9553_read_raw(struct iio_dev *indio_dev,
> int ret;
> u16 tmp;
> u8 activity;
> - bool powered_on;
>
> switch (mask) {
> case IIO_CHAN_INFO_PROCESSED:
> switch (chan->type) {
> case IIO_STEPS:
> - /*
> - * The HW only counts steps and other dependent
> - * parameters (speed, distance, calories, activity)
> - * if power is on (from enabling an event or the
> - * step counter */
> - powered_on =
> - mma9553_is_any_event_enabled(data, false, 0) ||
> - data->stepcnt_enabled;
> - if (!powered_on) {
> - dev_err(&data->client->dev,
> - "No channels enabled\n");
> - return -EINVAL;
> - }
> - mutex_lock(&data->mutex);
> - ret = mma9551_read_status_word(data->client,
> - MMA9551_APPID_PEDOMETER,
> + ret = mma9553_read_status_word(data,
> MMA9553_REG_STEPCNT,
> &tmp);
> - mutex_unlock(&data->mutex);
> if (ret < 0)
> return ret;
> *val = tmp;
> return IIO_VAL_INT;
> case IIO_DISTANCE:
> - powered_on =
> - mma9553_is_any_event_enabled(data, false, 0) ||
> - data->stepcnt_enabled;
> - if (!powered_on) {
> - dev_err(&data->client->dev,
> - "No channels enabled\n");
> - return -EINVAL;
> - }
> - mutex_lock(&data->mutex);
> - ret = mma9551_read_status_word(data->client,
> - MMA9551_APPID_PEDOMETER,
> + ret = mma9553_read_status_word(data,
> MMA9553_REG_DISTANCE,
> &tmp);
> - mutex_unlock(&data->mutex);
> if (ret < 0)
> return ret;
> *val = tmp;
> return IIO_VAL_INT;
> case IIO_ACTIVITY:
> - powered_on =
> - mma9553_is_any_event_enabled(data, false, 0) ||
> - data->stepcnt_enabled;
> - if (!powered_on) {
> - dev_err(&data->client->dev,
> - "No channels enabled\n");
> - return -EINVAL;
> - }
> - mutex_lock(&data->mutex);
> - ret = mma9551_read_status_word(data->client,
> - MMA9551_APPID_PEDOMETER,
> + ret = mma9553_read_status_word(data,
> MMA9553_REG_STATUS,
> &tmp);
> - mutex_unlock(&data->mutex);
> if (ret < 0)
> return ret;
>
> @@ -534,38 +521,17 @@ static int mma9553_read_raw(struct iio_dev *indio_dev,
> case IIO_VELOCITY: /* m/h */
> if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
> return -EINVAL;
> - powered_on =
> - mma9553_is_any_event_enabled(data, false, 0) ||
> - data->stepcnt_enabled;
> - if (!powered_on) {
> - dev_err(&data->client->dev,
> - "No channels enabled\n");
> - return -EINVAL;
> - }
> - mutex_lock(&data->mutex);
> - ret = mma9551_read_status_word(data->client,
> - MMA9551_APPID_PEDOMETER,
> - MMA9553_REG_SPEED, &tmp);
> - mutex_unlock(&data->mutex);
> + ret = mma9553_read_status_word(data,
> + MMA9553_REG_SPEED,
> + &tmp);
> if (ret < 0)
> return ret;
> *val = tmp;
> return IIO_VAL_INT;
> case IIO_ENERGY: /* Cal or kcal */
> - powered_on =
> - mma9553_is_any_event_enabled(data, false, 0) ||
> - data->stepcnt_enabled;
> - if (!powered_on) {
> - dev_err(&data->client->dev,
> - "No channels enabled\n");
> - return -EINVAL;
> - }
> - mutex_lock(&data->mutex);
> - ret = mma9551_read_status_word(data->client,
> - MMA9551_APPID_PEDOMETER,
> + ret = mma9553_read_status_word(data,
> MMA9553_REG_CALORIES,
> &tmp);
> - mutex_unlock(&data->mutex);
> if (ret < 0)
> return ret;
> *val = tmp;
>



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