linux-kernel - Re: [RFC 08/18] hwmon: vexpress: Use regmap instead of custom interface

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Date:	Wed, 08 Jan 2014 15:57:49 +0000
From:	Pawel Moll <pawel.moll@....com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>, Jon Medhurst <tixy@...aro.org>,
	"arm@...nel.org" <arm@...nel.org>, Olof Johansson <olof@...om.net>,
	Jean Delvare <khali@...ux-fr.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>
Subject: Re: [RFC 08/18] hwmon: vexpress: Use regmap instead of custom
 interface

On Mon, 2013-12-23 at 17:31 +0000, Guenter Roeck wrote:
> On Mon, Dec 23, 2013 at 04:23:40PM +0000, Pawel Moll wrote:
> > This patch makes the Versatile Express hwmon driver
> > use regmap interface, instead of custom vexpress config
> > one. It will request the regmap resource associated
> > with the device, which makes it pretty much hardware
> > agnostic.
> > 
> > Signed-off-by: Pawel Moll <pawel.moll@....com>
> > Cc: Jean Delvare <khali@...ux-fr.org>
> > Cc: Guenter Roeck <linux@...ck-us.net>
> > Cc: lm-sensors@...sensors.org
> > ---
> >  drivers/hwmon/Kconfig    |  3 ++-
> >  drivers/hwmon/vexpress.c | 29 +++++++++++------------------
> >  2 files changed, 13 insertions(+), 19 deletions(-)
> > 
> > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> > index 52d548f..7747a47 100644
> > --- a/drivers/hwmon/Kconfig
> > +++ b/drivers/hwmon/Kconfig
> > @@ -1324,7 +1324,8 @@ config SENSORS_TWL4030_MADC
> >  
> >  config SENSORS_VEXPRESS
> >  	tristate "Versatile Express"
> > -	depends on VEXPRESS_CONFIG
> > +	depends on ARM || ARM64
> > +	depends on REGMAP
> >  	help
> >  	  This driver provides support for hardware sensors available on
> >  	  the ARM Ltd's Versatile Express platform. It can provide wide
> > diff --git a/drivers/hwmon/vexpress.c b/drivers/hwmon/vexpress.c
> > index d867e6b..b58cf1c 100644
> > --- a/drivers/hwmon/vexpress.c
> > +++ b/drivers/hwmon/vexpress.c
> > @@ -22,11 +22,11 @@
> >  #include <linux/of.h>
> >  #include <linux/of_device.h>
> >  #include <linux/platform_device.h>
> > -#include <linux/vexpress.h>
> > +#include <linux/regmap.h>
> >  
> >  struct vexpress_hwmon_data {
> >  	struct device *hwmon_dev;
> > -	struct vexpress_config_func *func;
> > +	struct regmap *reg;
> >  };
> >  
> >  static ssize_t vexpress_hwmon_name_show(struct device *dev,
> > @@ -56,7 +56,7 @@ static ssize_t vexpress_hwmon_u32_show(struct device *dev,
> >  	int err;
> >  	u32 value;
> >  
> > -	err = vexpress_config_read(data->func, 0, &value);
> > +	err = regmap_read(data->reg, 0, &value);
> >  	if (err)
> >  		return err;
> >  
> > @@ -69,13 +69,13 @@ static ssize_t vexpress_hwmon_u64_show(struct device *dev,
> >  {
> >  	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
> >  	int err;
> > -	u32 value_hi, value_lo;
> > +	unsigned int value_hi, value_lo;
> >  
> > -	err = vexpress_config_read(data->func, 0, &value_lo);
> > +	err = regmap_read(data->reg, 0, &value_lo);
> >  	if (err)
> >  		return err;
> >  
> > -	err = vexpress_config_read(data->func, 1, &value_hi);
> > +	err = regmap_read(data->reg, 1, &value_hi);
> >  	if (err)
> >  		return err;
> >  
> > @@ -175,26 +175,21 @@ static int vexpress_hwmon_probe(struct platform_device *pdev)
> >  	if (!match)
> >  		return -ENODEV;
> >  
> > -	data->func = vexpress_config_func_get_by_dev(&pdev->dev);
> > -	if (!data->func)
> > +	data->reg = dev_get_regmap(&pdev->dev, NULL);
> > +	if (!data->reg)
> >  		return -ENODEV;
> >  
> >  	err = sysfs_create_group(&pdev->dev.kobj, match->data);
> >  	if (err)
> > -		goto error;
> > +		return err;
> >  
> >  	data->hwmon_dev = hwmon_device_register(&pdev->dev);
> >  	if (IS_ERR(data->hwmon_dev)) {
> > -		err = PTR_ERR(data->hwmon_dev);
> > -		goto error;
> > +		sysfs_remove_group(&pdev->dev.kobj, match->data);
> > +		return PTR_ERR(data->hwmon_dev);
> 
> This change is unrelated and violates coding style. If the goto disturbs you,
> I would suggest to convert the driver to use devm_hwmon_device_register_with_groups() 
> in a separate patch and get rid of the error handling and the entire remove() function.

Ok, will do, thanks!

Paweł

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