[PATCH v2 13/17] iio: accel: mma9553: refactor mma9553_read_raw

Irina Tirdea
2015-04-13T15:41:00Z

Refactor code for simplicity and clarity.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Suggested-by: Hartmut Knaack <knaack.h@gmx.de>
---
drivers/iio/accel/mma9553.c | 101 +++++++++++++++-----------------------------
1 file changed, 33 insertions(+), 68 deletions(-)

diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
index 5755977..8bfc618 100644
--- a/drivers/iio/accel/mma9553.c
+++ b/drivers/iio/accel/mma9553.c
@@ -440,6 +440,32 @@ 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)
@@ -448,70 +474,30 @@ 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;

@@ -536,38 +522,17 @@ 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;
--
1.9.1