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Commit 9aebf4de authored by Bjorn Andersson's avatar Bjorn Andersson
Browse files

base: soc: Add serial_number attribute to soc 



Add new attribute named "serial_number" as a standard interface for
user space to acquire the serial number of the device.

For ST-Ericsson SoCs this is exposed by the cryptically named "soc_id"
attribute, but this provides a human readable standardized name for this
property.

Tested-by: default avatarVinod Koul <vkoul@kernel.org>
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: default avatarVaishali Thakkar <vaishali.thakkar@linaro.org>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: default avatarStephen Boyd <swboyd@chromium.org>
Reviewed-by: default avatarVinod Koul <vkoul@kernel.org>
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
parent af311ff9

Documentation/ABI/testing/sysfs-devices-soc

+7 −0
Original line number Diff line number Diff line
@@ -26,6 +26,13 @@ Description: 
		Read-only attribute common to all SoCs. Contains SoC family name

		(e.g. DB8500).



What:		/sys/devices/socX/serial_number

Date:		January 2019

contact:	Bjorn Andersson <bjorn.andersson@linaro.org>

Description:

		Read-only attribute supported by most SoCs. Contains the SoC's

		serial number, if available.



What:		/sys/devices/socX/soc_id

Date:		January 2012

contact:	Lee Jones <lee.jones@linaro.org>

drivers/base/soc.c

+7 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ static struct bus_type soc_bus_type = { 


static DEVICE_ATTR(machine,  S_IRUGO, soc_info_get,  NULL);

static DEVICE_ATTR(family,   S_IRUGO, soc_info_get,  NULL);

static DEVICE_ATTR(serial_number, S_IRUGO, soc_info_get,  NULL);

static DEVICE_ATTR(soc_id,   S_IRUGO, soc_info_get,  NULL);

static DEVICE_ATTR(revision, S_IRUGO, soc_info_get,  NULL);
@@ -57,6 +58,9 @@ static umode_t soc_attribute_mode(struct kobject *kobj, 
	if ((attr == &dev_attr_revision.attr)

	    && (soc_dev->attr->revision != NULL))

		return attr->mode;

	if ((attr == &dev_attr_serial_number.attr)

	    && (soc_dev->attr->serial_number != NULL))

		return attr->mode;

	if ((attr == &dev_attr_soc_id.attr)

	    && (soc_dev->attr->soc_id != NULL))

		return attr->mode;
@@ -77,6 +81,8 @@ static ssize_t soc_info_get(struct device *dev, 
		return sprintf(buf, "%s\n", soc_dev->attr->family);

	if (attr == &dev_attr_revision)

		return sprintf(buf, "%s\n", soc_dev->attr->revision);

	if (attr == &dev_attr_serial_number)

		return sprintf(buf, "%s\n", soc_dev->attr->serial_number);

	if (attr == &dev_attr_soc_id)

		return sprintf(buf, "%s\n", soc_dev->attr->soc_id);
@@ -87,6 +93,7 @@ static ssize_t soc_info_get(struct device *dev, 
static struct attribute *soc_attr[] = {

	&dev_attr_machine.attr,

	&dev_attr_family.attr,

	&dev_attr_serial_number.attr,

	&dev_attr_soc_id.attr,

	&dev_attr_revision.attr,

	NULL,

include/linux/sys_soc.h

+1 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ struct soc_device_attribute { 
	const char *machine;

	const char *family;

	const char *revision;

	const char *serial_number;

	const char *soc_id;

	const void *data;

};