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iio: accel: mma9553: refactor mma9553_read_raw 

Refactor code for simplicity and clarity.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Suggested-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Irina Tirdea 2015-04-13 18:41:00 +03:00 committed by Jonathan Cameron
parent 996ba51459
commit 334efd076d
1 changed files with 33 additions and 68 deletions
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101
drivers/iio/accel/mma9553.c
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@ -441,6 +441,32 @@ 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)
@ -449,70 +475,30 @@ 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;
@ -537,38 +523,17 @@ 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;