On Mon, Oct 19, 2015 at 12:52:50PM +0200, Lars-Peter Clausen wrote:
> On 10/16/2015 12:29 PM, Teodora Baluta wrote:
> > This patch adds a minimal implementation for the Memsic MXC6255XC
> > orientation sensing accelerometer. The supported operations are reading
> > raw acceleration values for X/Y axis that can be scaled using the
> > exposed scale.
> >
> > Signed-off-by: Teodora Baluta <teodora.bal...@intel.com>
>
> Looks quite good in general, a few minor things inline.
Thanks for the review. I'll send a v2 as soon as possible.
>
> [...]
> > +/* scale value for +/- 2G measurement range */
> > +static const int mxc6255_scale = 153829;
> > +
> > +static IIO_CONST_ATTR(in_accel_scale_available, MXC6255_SCALE_AVAIL);
>
> If there is only one scale available it does not make too much sense to have
> a scale_available attribute.
>
> [..]
> > +static int mxc6255_read_raw(struct iio_dev *indio_dev,
> > + struct iio_chan_spec const *chan,
> > + int *val, int *val2, long mask)
> > +{
> > + struct mxc6255_data *data = iio_priv(indio_dev);
> > + unsigned int reg;
> > + int axis = chan->channel2 - 1;
>
> 1 is a bit of a magic constant here. Use IIO_MOD_X instead. Or even better
> use chan->address.
>
> > + int ret;
> > +
> > + switch (mask) {
> > + case IIO_CHAN_INFO_RAW:
> > + ret = regmap_read(data->regmap,
> > + MXC6255_AXIS_TO_REG(axis), ®);
> > + if (ret < 0) {
> > + dev_err(&data->client->dev,
> > + "Error reading axis %d\n", axis);
> > + return ret;
> > + }
> > +
> > + *val = sign_extend32(reg, 7);
> > + return IIO_VAL_INT;
> > + case IIO_CHAN_INFO_SCALE:
> > + *val = 0;
> > + *val2 = mxc6255_scale;
> > + return IIO_VAL_INT_PLUS_MICRO;
> > + default:
> > + return -EINVAL;
> > + }
> > +}
> [...]
> > +static int mxc6255_probe(struct i2c_client *client,
> > + const struct i2c_device_id *id)
> > +{
> [...]
> > + ret = regmap_read(data->regmap, MXC6255_REG_CHIP_ID, &chip_id);
> > + if (ret < 0) {
> > + dev_err(&client->dev, "Error reading chip id %d\n", ret);
> > + return ret;
> > + }
>
> Does it make sense to check whether chip ID matches the expected value, to
> catch mistakes where the I2C address is incorrect?
>
> > +
> > + dev_dbg(&client->dev, "Chip id %x\n", chip_id);
> > +
> > + ret = devm_iio_device_register(&client->dev, indio_dev);
> > + if (ret < 0) {
> > + dev_err(&client->dev, "Could not register IIO device\n");
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> [...]
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