linux-kernel - Re: [PATCH v5 3/9] fpga: dfl: afu: convert platform_driver to use dev

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Message-ID: <20190827213829.GA4237@hao-dev>
Date:   Wed, 28 Aug 2019 05:38:29 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     gregkh@...uxfoundation.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-doc@...r.kernel.org, atull@...nel.org
Subject: Re: [PATCH v5 3/9] fpga: dfl: afu: convert platform_driver to use
 dev_groups

On Thu, Aug 22, 2019 at 08:07:01AM -0700, Moritz Fischer wrote:
> Hi Hao,
> 
> On Mon, Aug 12, 2019 at 10:49:58AM +0800, Wu Hao wrote:
> > This patch takes advantage of driver core which helps to create
> > and remove sysfs attribute files, so there is no need to register
> > sysfs entries manually in dfl-afu platform river code.
> Same nit: s/river/driver
> > 
> > Signed-off-by: Wu Hao <hao.wu@...el.com>
> Acked-by: Moritz Fischer <mdf@...nel.org>


Hi Moritz

Thanks a lot for the review. : )

Have you got a chance to look into the other patches in this patchset?

Thanks
Hao

> > ---
> >  drivers/fpga/dfl-afu-main.c | 69 +++++++++++++++++++++++----------------------
> >  1 file changed, 36 insertions(+), 33 deletions(-)
> > 
> > diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
> > index e50c45e..e955149 100644
> > --- a/drivers/fpga/dfl-afu-main.c
> > +++ b/drivers/fpga/dfl-afu-main.c
> > @@ -282,24 +282,17 @@ static int port_get_id(struct platform_device *pdev)
> >  	&dev_attr_power_state.attr,
> >  	NULL,
> >  };
> > -ATTRIBUTE_GROUPS(port_hdr);
> > +
> > +static const struct attribute_group port_hdr_group = {
> > +	.attrs = port_hdr_attrs,
> > +};
> >  
> >  static int port_hdr_init(struct platform_device *pdev,
> >  			 struct dfl_feature *feature)
> >  {
> > -	dev_dbg(&pdev->dev, "PORT HDR Init.\n");
> > -
> >  	port_reset(pdev);
> >  
> > -	return device_add_groups(&pdev->dev, port_hdr_groups);
> > -}
> > -
> > -static void port_hdr_uinit(struct platform_device *pdev,
> > -			   struct dfl_feature *feature)
> > -{
> > -	dev_dbg(&pdev->dev, "PORT HDR UInit.\n");
> > -
> > -	device_remove_groups(&pdev->dev, port_hdr_groups);
> > +	return 0;
> >  }
> >  
> >  static long
> > @@ -330,7 +323,6 @@ static void port_hdr_uinit(struct platform_device *pdev,
> >  
> >  static const struct dfl_feature_ops port_hdr_ops = {
> >  	.init = port_hdr_init,
> > -	.uinit = port_hdr_uinit,
> >  	.ioctl = port_hdr_ioctl,
> >  };
> >  
> > @@ -361,32 +353,37 @@ static void port_hdr_uinit(struct platform_device *pdev,
> >  	&dev_attr_afu_id.attr,
> >  	NULL
> >  };
> > -ATTRIBUTE_GROUPS(port_afu);
> >  
> > -static int port_afu_init(struct platform_device *pdev,
> > -			 struct dfl_feature *feature)
> > +static umode_t port_afu_attrs_visible(struct kobject *kobj,
> > +				      struct attribute *attr, int n)
> >  {
> > -	struct resource *res = &pdev->resource[feature->resource_index];
> > -	int ret;
> > -
> > -	dev_dbg(&pdev->dev, "PORT AFU Init.\n");
> > +	struct device *dev = kobj_to_dev(kobj);
> >  
> > -	ret = afu_mmio_region_add(dev_get_platdata(&pdev->dev),
> > -				  DFL_PORT_REGION_INDEX_AFU, resource_size(res),
> > -				  res->start, DFL_PORT_REGION_READ |
> > -				  DFL_PORT_REGION_WRITE | DFL_PORT_REGION_MMAP);
> > -	if (ret)
> > -		return ret;
> > +	/*
> > +	 * sysfs entries are visible only if related private feature is
> > +	 * enumerated.
> > +	 */
> > +	if (!dfl_get_feature_by_id(dev, PORT_FEATURE_ID_AFU))
> > +		return 0;
> >  
> > -	return device_add_groups(&pdev->dev, port_afu_groups);
> > +	return attr->mode;
> >  }
> >  
> > -static void port_afu_uinit(struct platform_device *pdev,
> > -			   struct dfl_feature *feature)
> > +static const struct attribute_group port_afu_group = {
> > +	.attrs      = port_afu_attrs,
> > +	.is_visible = port_afu_attrs_visible,
> > +};
> > +
> > +static int port_afu_init(struct platform_device *pdev,
> > +			 struct dfl_feature *feature)
> >  {
> > -	dev_dbg(&pdev->dev, "PORT AFU UInit.\n");
> Thanks.
> > +	struct resource *res = &pdev->resource[feature->resource_index];
> >  
> > -	device_remove_groups(&pdev->dev, port_afu_groups);
> > +	return afu_mmio_region_add(dev_get_platdata(&pdev->dev),
> > +				   DFL_PORT_REGION_INDEX_AFU,
> > +				   resource_size(res), res->start,
> > +				   DFL_PORT_REGION_MMAP | DFL_PORT_REGION_READ |
> > +				   DFL_PORT_REGION_WRITE);
> >  }
> >  
> >  static const struct dfl_feature_id port_afu_id_table[] = {
> > @@ -396,7 +393,6 @@ static void port_afu_uinit(struct platform_device *pdev,
> >  
> >  static const struct dfl_feature_ops port_afu_ops = {
> >  	.init = port_afu_init,
> > -	.uinit = port_afu_uinit,
> >  };
> >  
> >  static struct dfl_feature_driver port_feature_drvs[] = {
> > @@ -748,9 +744,16 @@ static int afu_remove(struct platform_device *pdev)
> >  	return 0;
> >  }
> >  
> > +static const struct attribute_group *afu_dev_groups[] = {
> > +	&port_hdr_group,
> > +	&port_afu_group,
> > +	NULL
> > +};
> > +
> >  static struct platform_driver afu_driver = {
> >  	.driver	= {
> > -		.name    = DFL_FPGA_FEATURE_DEV_PORT,
> > +		.name	    = DFL_FPGA_FEATURE_DEV_PORT,
> > +		.dev_groups = afu_dev_groups,
> >  	},
> >  	.probe   = afu_probe,
> >  	.remove  = afu_remove,
> > -- 
> > 1.8.3.1
> > 
> 
> Thanks,
> Moritz