Re: [PATCH v2 2/2] iio: temperature: add driver support for ti tmp117
From: Andy Shevchenko
Date: Thu Apr 01 2021 - 05:38:08 EST
On Thu, Apr 1, 2021 at 12:19 PM Puranjay Mohan <puranjay12@xxxxxxxxx> wrote:
>
> TMP117 is a Digital temperature sensor with integrated NV memory.
>
> Add support for tmp117 driver in iio subsystem.
+ blank line
> Datasheet:-https://www.ti.com/lit/gpn/tmp117
Make it a tag, i.e. remove the following blank line and use a space after colon.
>
> Signed-off-by: Puranjay Mohan <puranjay12@xxxxxxxxx>
...
> +/*
> + * tmp117.c - Digital temperature sensor with integrated NV memory
It's useless and provokes an unneeded churn when having a file name
inside the file.
Please, drop it for good.
> + *
> + * Copyright (c) 2021 Puranjay Mohan <puranjay12@xxxxxxxxx>
> + *
> + * Driver for the Texas Instruments TMP117 Temperature Sensor
> + *
Redundant blank line.
> + * (7-bit I2C slave address (0x48 - 0x4B), changeable via ADD pins)
> + *
> + * Note: This driver assumes that the sensor has been calibrated beforehand.
> + */
...
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
Missed:
bitops.h //sign_extend32()
types.h // s32
> +
> +#include <linux/iio/iio.h>
...
> +struct tmp117_data {
> + struct i2c_client *client;
> +};
Doesn't make any sense to have a separate structure for just one
pointer member. Use that pointer directly.
...
> + case IIO_CHAN_INFO_CALIBBIAS:
> + ret = i2c_smbus_read_word_swapped(data->client,
> + TMP117_REG_TEMP_OFFSET);
> + if (ret < 0)
> + return ret;
> + *val = ((int16_t)ret * (int32_t)TMP117_RESOLUTION_10UC)
> + / 10000;
One line
> + *val2 = ((int16_t)ret * (int32_t)TMP117_RESOLUTION_10UC)
> + % 10000;
One line.
I'll be honest, I do not like these explicit castings at all. Can you
revisit and try to refactor that you won't need them?
For example, I can't understand how ret can be higher than 16 bit
since we checked on negative values beforehand.
> + return IIO_VAL_INT_PLUS_MICRO;
> +
> + case IIO_CHAN_INFO_SCALE:
> + /* Conversion from 10s of uC to mC
> + * as IIO reports temperature in mC
> + */
> + *val = TMP117_RESOLUTION_10UC / 10000;
> + *val2 = (TMP117_RESOLUTION_10UC % 10000) * 100;
> + return IIO_VAL_INT_PLUS_MICRO;
You use 10000 many times, can you give it an appropriate name (via #define)?
...
> + s16 off;
> + case IIO_CHAN_INFO_CALIBBIAS:
> + off = (s16)val;
Redundant explicit casting.
> + return i2c_smbus_write_word_swapped(data->client,
> + TMP117_REG_TEMP_OFFSET, off);
...
> +static const struct of_device_id tmp117_of_match[] = {
> + { .compatible = "ti,tmp117", },
> + { },
No need to comma in terminator line(s).
> +};
--
With Best Regards,
Andy Shevchenko