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SubjectRe: [PATCH v4 2/3] iio: light: Add support for vishay vcnl4035
On Thu, Aug 2, 2018 at 9:27 PM, Parthiban Nallathambi <pn@denx.de> wrote:
> Add support for VCNL4035, which is capable of Ambient light
> sensing (ALS) and proximity function. This patch adds support
> only for ALS function

> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/bitops.h>
> +#include <linux/regmap.h>
> +#include <linux/pm_runtime.h>

Sort?

> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/iio/events.h>
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/trigger.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/triggered_buffer.h>

Ditto.

> + if (reg & (VCNL4035_INT_ALS_IF_H_MASK | VCNL4035_INT_ALS_IF_L_MASK))
> + return true;
> + else
> + return false;

return !!(reg & ...); ?

> +static irqreturn_t vcnl4035_drdy_irq_thread(int irq, void *private)
> +{
> + struct iio_dev *indio_dev = private;
> + struct vcnl4035_data *data = iio_priv(indio_dev);
> +

> + if (vcnl4035_is_triggered(data)) {

Here is negative conditional suits.

> +#ifndef CONFIG_PM

Why?

> + ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
> + if (ret < 0)
> + return ret;
> +#endif

> + pr_err("regmap_write default THDH returned %d\n", ret);

dev_err()

> + pr_err("regmap_write default THDL returned %d\n", ret);

Ditto.


> + ret = pm_runtime_set_active(&client->dev);
> + if (ret < 0)
> + goto fail_poweroff;
> +
> + pm_runtime_enable(&client->dev);
> + pm_runtime_set_autosuspend_delay(&client->dev, VCNL4035_SLEEP_DELAY_MS);
> + pm_runtime_use_autosuspend(&client->dev);

Usually we do this after we probed the device.

> + if (client->irq) {

First of all, it can be negative.
Second, care to factor out this rather long branch to a separate function?

> + if (ret < 0) {
> + dev_err(&client->dev, "request irq %d for trigger0 failed\n",
> + client->irq);
> + goto fail_buffer_clean;
> + }

Indentation.

> + }

So, do I understand correctly that IRQ is optional for this device?



> +#ifdef CONFIG_PM
> +static int vcnl4035_runtime_suspend(struct device *dev)

Perhaps __maybe_unused

> +static int vcnl4035_runtime_resume(struct device *dev)

Ditto.

> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct vcnl4035_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + regcache_sync(data->regmap);
> + ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE);
> + if (ret < 0)
> + return ret;

+ blank line

> + /* wait for 1 ALS integration cycle */
> + msleep(data->als_it_val * 100);
> +
> + return 0;
> +}
> +#endif

> +static const struct of_device_id vcnl4035_of_match[] = {
> + { .compatible = "vishay,vcnl4035", },
> + { },

Better w/o comma.

> +};
> +MODULE_DEVICE_TABLE(of, vcnl4035_of_match);

> +
> +static const struct i2c_device_id vcnl4035_id[] = {
> + { "vcnl4035", 0 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, vcnl4035_id);

Are you expecting legacy code to use this? I would rather switch to
->probe_new() and also remove this.

--
With Best Regards,
Andy Shevchenko

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