linux-kernel - Re: [PATCH 1/1] drivers/misc: Add Intel System ID driver

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Date:   Thu, 23 Feb 2017 05:50:24 +0000
From:   "Loh, Tien Hock" <tien.hock.loh@...el.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Nguyen, Dinh" <dinh.nguyen@...el.com>,
        "thloh85@...il.com" <thloh85@...il.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "Gerlach, Matthew" <matthew.gerlach@...el.com>
Subject: Re: [PATCH 1/1] drivers/misc: Add Intel System ID driver

Sorry for the late reply. I'll add the Documentation/ABI description,
use DEVICE_ATTR_RO and update ATTRIBUTE_GROUP. 

Thanks
Tien Hock

On Rab, 2017-02-15 at 09:17 -0800, Greg KH wrote:
> On Wed, Feb 15, 2017 at 07:09:41PM +0800, thloh wrote:
> > 
> > From: "Loh, Tien Hock" <tien.hock.loh@...el.com>
> > 
> > This patch is to add Altera System ID driver.
> > User can obtain the system ID and timestamp of the system by
> > reading the sysfs entry.
> > 
> > Usage:
> > cat /sys/bus/platform/devices/[addr].sysid/sysid/id
> > cat /sys/bus/platform/devices/[addr].sysid/sysid/timestamp
> If you add new sysfs attributes, you need to also add a
> Documentation/ABI/ description as well.
> 
> > 
> > 
> > Signed-off-by: Loh, Tien Hock <tien.hock.loh@...el.com>
> > ---
> >  drivers/misc/Kconfig       |    5 ++
> >  drivers/misc/Makefile      |    1 +
> >  drivers/misc/intel_sysid.c |  142
> > ++++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 148 insertions(+), 0 deletions(-)
> >  create mode 100644 drivers/misc/intel_sysid.c
> > 
> > diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> > index b4d6aac..e5552fa 100644
> > --- a/drivers/misc/Kconfig
> > +++ b/drivers/misc/Kconfig
> > @@ -139,6 +139,11 @@ config INTEL_MID_PTI
> >  	  an Intel Atom (non-netbook) mobile device containing a
> > MIPI
> >  	  P1149.7 standard implementation.
> >  
> > +config INTEL_SYSID
> > +        tristate "Intel System ID"
> > +        help
> > +        This enables Intel System ID soft core driver.
> > +
> >  config SGI_IOC4
> >  	tristate "SGI IOC4 Base IO support"
> >  	depends on PCI
> > diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
> > index 7a3ea89..24fe724 100644
> > --- a/drivers/misc/Makefile
> > +++ b/drivers/misc/Makefile
> > @@ -43,6 +43,7 @@ obj-y				+= ti-st/
> >  obj-y				+= lis3lv02d/
> >  obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
> >  obj-$(CONFIG_ALTERA_STAPL)	+=altera-stapl/
> > +obj-$(CONFIG_INTEL_SYSID)       += intel_sysid.o
> >  obj-$(CONFIG_INTEL_MEI)		+= mei/
> >  obj-$(CONFIG_VMWARE_VMCI)	+= vmw_vmci/
> >  obj-$(CONFIG_LATTICE_ECP3_CONFIG)	+= lattice-ecp3-config.o
> > diff --git a/drivers/misc/intel_sysid.c
> > b/drivers/misc/intel_sysid.c
> > new file mode 100644
> > index 0000000..1ef72b8
> > --- /dev/null
> > +++ b/drivers/misc/intel_sysid.c
> > @@ -0,0 +1,142 @@
> > +/*
> > + * Copyright Intel Corporation (C) 2017.
> > + *
> > + * This program is free software; you can redistribute it and/or
> > modify it
> > + * under the terms and conditions of the GNU General Public
> > License,
> > + * version 2, as published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope 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.
> > + *
> > + * You should have received a copy of the GNU General Public
> > License along with
> > + * this program.  If not, see <http://www.gnu.org/licenses/>.
> > + *
> > + * Credit:
> > + * Walter Goossens
> > + */
> > +
> > +#include <linux/device.h>
> > +#include <linux/kernel.h>
> > +#include <linux/io.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/slab.h>
> > +
> > +#define DRV_NAME	"intel_sysid"
> > +
> > +struct intel_sysid {
> > +	void __iomem		*regs;
> > +};
> > +
> > +/* System ID Registers*/
> > +#define SYSID_REG_ID		(0x0)
> > +#define SYSID_REG_TIMESTAMP	(0x4)
> > +
> > +static ssize_t intel_sysid_show_id(struct device *dev,
> > +		struct device_attribute *attr, char *buf)
> > +{
> > +	struct intel_sysid *sysid = dev_get_drvdata(dev);
> > +
> > +	return sprintf(buf, "%u\n", readl(sysid->regs +
> > SYSID_REG_ID));
> > +}
> > +
> > +static ssize_t intel_sysid_show_timestamp(struct device *dev,
> > +		struct device_attribute *attr, char *buf)
> > +{
> > +	unsigned int reg;
> > +	struct tm timestamp;
> > +	struct intel_sysid *sysid = dev_get_drvdata(dev);
> > +
> > +	reg = readl(sysid->regs + SYSID_REG_TIMESTAMP);
> > +
> > +	time_to_tm(reg, 0, &timestamp);
> > +
> > +	return sprintf(buf, "%u (%u-%u-%u %u:%u:%u UTC)\n", reg,
> > +		(unsigned int)(timestamp.tm_year + 1900),
> > +		timestamp.tm_mon + 1, timestamp.tm_mday,
> > timestamp.tm_hour,
> > +		timestamp.tm_min, timestamp.tm_sec);
> > +}
> > +
> > +static DEVICE_ATTR(id, S_IRUGO, intel_sysid_show_id, NULL);
> > +static DEVICE_ATTR(timestamp, S_IRUGO, intel_sysid_show_timestamp,
> > NULL);
> DEVICE_ATTR_RO()?
> 
> > 
> > +static struct attribute *intel_sysid_attrs[] = {
> > +	&dev_attr_id.attr,
> > +	&dev_attr_timestamp.attr,
> > +	NULL,
> > +};
> > +
> > +struct attribute_group intel_sysid_attr_group = {
> > +	.name = "sysid",
> > +	.attrs = intel_sysid_attrs,
> > +};
> ATTRIBUTE_GROUP()?
> 
> thanks,
> 
> greg k-h