redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity

iio: accell: mma8452: Reduce sleep time when data not ready

Browse source 
Modified the sleep method when data is not ready to allow for sampling > 50sps to work.

Signed-off-by: Richard Tresidder <rtresidd@electromag.com.au>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Richard Tresidder 2018-05-11 16:54:59 +08:00 committed by Jonathan Cameron
parent 2a86487786
commit a45d123887
1 changed files with 23 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
drivers/iio/accel/mma8452.c
View file

@ -106,6 +106,7 @@ struct mma8452_data {
u8 ctrl_reg1;
u8 data_cfg;
const struct mma_chip_info *chip_info;
int sleep_val;
};
/**
@ -193,7 +194,11 @@ static int mma8452_drdy(struct mma8452_data *data)
if ((ret & MMA8452_STATUS_DRDY) == MMA8452_STATUS_DRDY)
return 0;
msleep(20);
if (data->sleep_val <= 20)
usleep_range(data->sleep_val * 250,
data->sleep_val * 500);
else
msleep(20);
}
dev_err(&data->client->dev, "data not ready\n");
@ -544,6 +549,18 @@ static int mma8452_read_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
static int mma8452_calculate_sleep(struct mma8452_data *data)
{
int ret, i = mma8452_get_odr_index(data);
if (mma8452_samp_freq[i][0] > 0)
ret = 1000 / mma8452_samp_freq[i][0];
else
ret = 1000;
return ret == 0 ? 1 : ret;
}
static int mma8452_standby(struct mma8452_data *data)
{
return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1,
@ -700,6 +717,8 @@ static int mma8452_write_raw(struct iio_dev *indio_dev,
data->ctrl_reg1 &= ~MMA8452_CTRL_DR_MASK;
data->ctrl_reg1 |= i << MMA8452_CTRL_DR_SHIFT;
data->sleep_val = mma8452_calculate_sleep(data);
ret = mma8452_change_config(data, MMA8452_CTRL_REG1,
data->ctrl_reg1);
break;
@ -1593,6 +1612,9 @@ static int mma8452_probe(struct i2c_client *client,
data->ctrl_reg1 = MMA8452_CTRL_ACTIVE |
(MMA8452_CTRL_DR_DEFAULT << MMA8452_CTRL_DR_SHIFT);
data->sleep_val = mma8452_calculate_sleep(data);
ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG1,
data->ctrl_reg1);
if (ret < 0)