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iio:accel:stk8312: improve error handling 

Improve error handling in the following ways:
  - set return value on error condition to an appropriate error code
  - return error code immediately in case of an error (slightly changes
    code structure)
  - pass up real error code
  - add missing error handling
  - return 0 when error have been caught already
  - put device back in active mode after error occurs

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Hartmut Knaack 2015-07-29 23:39:36 +02:00 committed by Jonathan Cameron
parent b41e63cf83
commit 18422bb3c1
1 changed files with 38 additions and 22 deletions
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60
drivers/iio/accel/stk8312.c
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@ -146,8 +146,10 @@ static int stk8312_otp_init(struct stk8312_data *data)
count--;
} while (!(ret & 0x80) && count > 0);
if (count == 0)
if (count == 0) {
ret = -ETIMEDOUT;
goto exit_err;
}
ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
if (ret == 0)
@ -161,7 +163,7 @@ static int stk8312_otp_init(struct stk8312_data *data)
goto exit_err;
msleep(150);
return ret;
return 0;
exit_err:
dev_err(&client->dev, "failed to initialize sensor\n");
@ -205,8 +207,11 @@ static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
return ret;
ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
if (ret < 0)
if (ret < 0) {
dev_err(&client->dev, "failed to set interrupts\n");
stk8312_set_mode(data, mode);
return ret;
}
return stk8312_set_mode(data, mode);
}
@ -230,7 +235,7 @@ static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
data->dready_trigger_on = state;
return ret;
return 0;
}
static const struct iio_trigger_ops stk8312_trigger_ops = {
@ -255,20 +260,24 @@ static int stk8312_set_sample_rate(struct stk8312_data *data, int rate)
return ret;
ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
if (ret < 0) {
dev_err(&client->dev, "failed to set sampling rate\n");
return ret;
}
if (ret < 0)
goto err_activate;
masked_reg = (ret & (~STK8312_SR_MASK)) | rate;
ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
if (ret < 0)
dev_err(&client->dev, "failed to set sampling rate\n");
else
data->sample_rate_idx = rate;
goto err_activate;
data->sample_rate_idx = rate;
return stk8312_set_mode(data, mode);
err_activate:
dev_err(&client->dev, "failed to set sampling rate\n");
stk8312_set_mode(data, mode);
return ret;
}
static int stk8312_set_range(struct stk8312_data *data, u8 range)
@ -290,21 +299,25 @@ static int stk8312_set_range(struct stk8312_data *data, u8 range)
return ret;
ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
if (ret < 0) {
dev_err(&client->dev, "failed to change sensor range\n");
return ret;
}
if (ret < 0)
goto err_activate;
masked_reg = ret & (~STK8312_RNG_MASK);
masked_reg |= range << STK8312_RNG_SHIFT;
ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
if (ret < 0)
dev_err(&client->dev, "failed to change sensor range\n");
else
data->range = range;
goto err_activate;
data->range = range;
return stk8312_set_mode(data, mode);
err_activate:
dev_err(&client->dev, "failed to change sensor range\n");
stk8312_set_mode(data, mode);
return ret;
}
static int stk8312_read_accel(struct stk8312_data *data, u8 address)
@ -337,18 +350,21 @@ static int stk8312_read_raw(struct iio_dev *indio_dev,
ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
if (ret < 0) {
mutex_unlock(&data->lock);
return -EINVAL;
return ret;
}
ret = stk8312_read_accel(data, chan->address);
if (ret < 0) {
stk8312_set_mode(data,
data->mode & (~STK8312_MODE_ACTIVE));
mutex_unlock(&data->lock);
return -EINVAL;
return ret;
}
*val = sign_extend32(ret, 7);
stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
ret = stk8312_set_mode(data,
data->mode & (~STK8312_MODE_ACTIVE));
mutex_unlock(&data->lock);
if (ret < 0)
return ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = stk8312_scale_table[data->range - 1][0];
@ -608,7 +624,7 @@ static int stk8312_probe(struct i2c_client *client,
goto err_buffer_cleanup;
}
return ret;
return 0;
err_buffer_cleanup:
iio_triggered_buffer_cleanup(indio_dev);