Messages in this thread | | | From | Andy Shevchenko <> | Date | Fri, 19 Aug 2022 11:41:55 +0300 | Subject | Re: [PATCH v6 3/4] iio: add MEMSensing MSA311 3-axis accelerometer driver |
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On Tue, Aug 16, 2022 at 10:18 PM Dmitry Rokosov <DDRokosov@sberdevices.ru> wrote: > > MSA311 is a tri-axial, low-g accelerometer with I2C digital output for > sensitivity consumer applications. It has dynamic user-selectable full > scales range of +-2g/+-4g/+-8g/+-16g and allows acceleration measurements > with output data rates from 1Hz to 1000Hz. > > This driver supports following MSA311 features: > - IIO interface > - Different power modes: NORMAL and SUSPEND (using pm_runtime) > - ODR (Output Data Rate) selection > - Scale and samp_freq selection > - IIO triggered buffer, IIO reg access > - NEW_DATA interrupt + trigger > > Below features to be done: > - Motion Events: ACTIVE, TAP, ORIENT, FREEFALL > - Low Power mode
> Spec: https://cdn-shop.adafruit.com/product-files/5309/MSA311-V1.1-ENG.pdf
Have you ever seen such a tag? We have the Datasheet that is more or less established for this kind of links.
The comments below are not a big deal, though.
...
> +static const struct iio_decimal_fract msa311_fs_table[] = { > + {0, 9580}, {0, 19160}, {0, 38320}, {0, 76641}
I would still keep the trailing comma for better consistency with a style.
> +};
...
> +static const struct iio_decimal_fract msa311_odr_table[] = { > + {1, 0}, {1, 950000}, {3, 900000}, {7, 810000}, {15, 630000}, > + {31, 250000}, {62, 500000}, {125, 0}, {250, 0}, {500, 0}, {1000, 0}
Ditto.
> +};
...
> +struct msa311_priv { > + struct regmap *regs; > + struct regmap_field *fields[F_MAX_FIELDS]; > + > + struct device *dev; > + struct mutex lock;
> + char chip_name[10];
Why limit it to 10? You may use devm_kasprintf()
> + struct iio_trigger *new_data_trig; > + struct regulator *vdd; > +};
...
> +static inline int msa311_set_odr(struct msa311_priv *msa311, unsigned int odr)
Why inline?
> +{ > + struct device *dev = msa311->dev; > + unsigned int pwr_mode;
> + bool good_odr = false;
Can it be split to see the assignments together below?
> + int err; > + > + err = regmap_field_read(msa311->fields[F_PWR_MODE], &pwr_mode); > + if (err) > + return err; > + > + /* Filter bad ODR values */ > + if (pwr_mode == MSA311_PWR_MODE_NORMAL) > + good_odr = (odr > MSA311_ODR_1_95_HZ);
else good_odr = false;
> + if (!good_odr) { > + dev_err(dev, > + "can't set odr %u.%06uHz, not available in %s mode\n", > + msa311_odr_table[odr].integral, > + msa311_odr_table[odr].microfract, > + msa311_pwr_modes[pwr_mode]); > + return -EINVAL; > + } > + > + return regmap_field_write(msa311->fields[F_ODR], odr); > +}
...
> + if (wait_ms < unintr_thresh_ms) > + usleep_range(wait_ms * USEC_PER_MSEC, > + unintr_thresh_ms * USEC_PER_MSEC); > + else > + return msleep_interruptible(wait_ms) ? -EINTR : 0;
Can be refactored to simple
else if (msleep...) return -EINTR;
Same amount of LoCs, but more readable.
> + return 0;
...
> +err:
We usually name labels after what they are doing, I don't see any error here, but notify done. Hence,
out_notify_done:
> + iio_trigger_notify_done(indio_dev->trig); > + > + return IRQ_HANDLED;
...
> + used = scnprintf(msa311->chip_name, sizeof(msa311->chip_name), > + "msa311-%hhx", partid);
How 'used' is being used?
> + return 0; > +}
...
> + const char zero_bulk[2] = {0};
0 is not needed, '{ }' will work.
...
> + /* > + * Register powerdown deferred callback which suspends the chip > + * after module unloaded. > + * > + * MSA311 should be in SUSPEND mode in the two cases: > + * 1) When driver is loaded, but we do not have any data or > + * configuration requests to it (we are solving it using > + * autosuspend feature). > + * 2) When driver is unloaded and device is not used (devm action is > + * used in this case). > + */
...
> +static struct i2c_driver msa311_driver = { > + .driver = { > + .name = "msa311",
> + .owner = THIS_MODULE,
Redundant.
> + .of_match_table = msa311_of_match, > + .pm = pm_ptr(&msa311_pm_ops), > + }, > + .probe_new = msa311_probe, > + .id_table = msa311_i2c_id, > +};
-- With Best Regards, Andy Shevchenko
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