linux-kernel - Re: [PATCH v3] Input: tsc2005

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Message-ID: <20151030014522.GA14178@localhost>
Date:	Thu, 29 Oct 2015 18:45:22 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Michael Welling <mwelling@...e.org>
Cc:	Tony Lindgren <tony@...mide.com>, Pavel Machek <pavel@....cz>,
	Felipe Balbi <balbi@...com>,
	Sebastian Reichel <sre@...nel.org>,
	Roger Quadros <rogerq@...com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH v3] Input: tsc2005 - Add support for tsc2004

Hi Michael,

On Wed, Oct 28, 2015 at 07:12:34PM -0500, Michael Welling wrote:
> Adds support for the i2c based tsc2004.
> 
> Due to the overlapping functionality of the tsc2004 and tsc2005
> the common code was moved to a core driver (tsc200x-core).
> 
> Signed-off-by: Michael Welling <mwelling@...e.org>

In addition to what has been discussed in the other email:

> ---
> v3: Splits the tsc2004 and tsc2005 into separate drivers with
> with common routines in tsc200x-core.
> v2: Fixes Kconfig based on report for 0-day build bot.
>  .../bindings/input/touchscreen/tsc2004.txt         |  38 +

Can we please combine tsc2004.txt and tsc2005.txt?

>  
> +config TOUCHSCREEN_TSC200X
> +	tristate

Let's call it TOUCHSCREEN_TSC200X_CORE.

> --- /dev/null
> +++ b/drivers/input/touchscreen/tsc2004.c
> @@ -0,0 +1,73 @@
> +/*
> + * TSC2004 touchscreen driver
> + *
> + * Copyright (C) 2015 EMAC Inc.
> + * Copyright (C) 2015 QWERTY Embedded Design
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *

Please drop this empty line in the comment.

> + */
> +
> +#include <linux/module.h>
> +#include <linux/input.h>
> +#include <linux/pm.h>
> +#include <linux/of.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include "tsc200x-core.h"
> +
> +static int tsc2004_probe(struct i2c_client *i2c,
> +			 const struct i2c_device_id *id)
> +
> +{
> +	return tsc200x_probe(&i2c->dev, i2c->irq, BUS_I2C,
> +			     devm_regmap_init_i2c(i2c,
> +						  &tsc2005_regmap_config));
> +}
> +
> +static int tsc2004_remove(struct i2c_client *i2c)
> +{
> +	return tsc200x_remove(&i2c->dev);
> +}
> +
> +static const struct i2c_device_id tsc2004_idtable[] = {
> +	{ "tsc2004", 0 },
> +	{ }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id tsc2004_of_match[] = {
> +	{ .compatible = "ti,tsc2004" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, tsc2004_of_match);
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(tsc2004_pm_ops, tsc200x_suspend, tsc200x_resume);

Hmm, maybe you should export tsc200x_pm_ops instead of individual
functions.

> +
> +int __maybe_unused tsc200x_suspend(struct device *dev)
> +{
> +	struct tsc2005 *ts = dev_get_drvdata(dev);
> +
> +	mutex_lock(&ts->mutex);
> +
> +	if (!ts->suspended && ts->opened)
> +		__tsc2005_disable(ts);
> +
> +	ts->suspended = true;
> +
> +	mutex_unlock(&ts->mutex);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(tsc200x_suspend);

__maybe_unused does not make sense here - the symbol is exported and
therefore is always used. If you export the pm_ops stucture then you can
keep functions as __maybe_unused.

BTW, can you generate the patch with -M to let git do the rename
detection - it will be easier to see what changed in the core.

Thanks!

-- 
Dmitry
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