linux-kernel - Re: [PATCH v2 4/5] iio: pressure: bmp280: Add support for BMP380 sensor family

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Date:   Mon, 4 Jul 2022 07:52:29 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Angel Iglesias <ang.iglesiasg@...il.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Paul Cercueil <paul@...pouillou.net>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/5] iio: pressure: bmp280: Add support for BMP380
 sensor family

On Mon, Jul 04, 2022 at 02:32:09AM +0200, Angel Iglesias wrote:
> +/* Send a command to BMP3XX sensors */
> +static int bmp380_cmd(struct bmp280_data *data, u8 cmd)
> +{
> +	int ret;
> +	unsigned int reg;
> +
> +	/* check if device is ready to process a command */
> +	ret = regmap_read(data->regmap, BMP380_REG_STATUS, &reg);
> +	if (ret) {
> +		dev_err(data->dev, "failed to read error register\n");
> +		return ret;
> +	}
> +	if (!(cmd & BMP380_STATUS_CMD_RDY_MASK)) {

This looks like it should be "reg" instead of command?

> +		dev_err(data->dev, "device is not ready to accept commands\n");
> +		return -EBUSY;
> +	}
> +
> +	/* send command to process */
> +	ret = regmap_write(data->regmap, BMP380_REG_CMD, cmd);
> +	if (ret) {
> +		dev_err(data->dev, "failed to send command to device\n");
> +		return ret;
> +	}
> +	/* wait for 2ms for command to be proccessed */
> +	usleep_range(data->start_up_time, data->start_up_time + 100);
> +	/* check for command processing error */
> +	ret = regmap_read(data->regmap, BMP380_REG_ERROR, &reg);
> +	if (ret) {
> +		dev_err(data->dev, "error reading ERROR reg\n");
> +		return ret;
> +	}
> +	if (reg & BMP380_ERR_CMD_MASK) {
> +		dev_err(data->dev, "error processing command 0x%X\n", cmd);
> +		return -EINVAL;
> +	}
> +	dev_dbg(data->dev, "Command 0x%X proccessed successfully\n", cmd);
> +
> +	return 0;
> +}

regards,
dan carpenter