From: Bjorn Andersson <[email protected]> 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. Signed-off-by: Bjorn Andersson <[email protected]> Signed-off-by: Vaishali Thakkar <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Reviewed-by: Stephen Boyd <[email protected]> --- Changes since v4: - Add Stephen's reviewed-by Changes since v3: - Add Greg's Reviewed-by Changes since v2: - None Changes since v1: - Make comment more clear for the case when serial number is not available --- Documentation/ABI/testing/sysfs-devices-soc | 7 +++++++ drivers/base/soc.c | 7 +++++++ include/linux/sys_soc.h | 1 + 3 files changed, 15 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-devices-soc b/Documentation/ABI/testing/sysfs-devices-soc index 6d9cc253f2b2..ba3a3fac0ee1 100644 --- a/Documentation/ABI/testing/sysfs-devices-soc +++ b/Documentation/ABI/testing/sysfs-devices-soc @@ -28,0 +29,7 @@ Description: +What: /sys/devices/socX/serial_number +Date: January 2019 +contact: Bjorn Andersson <[email protected]> +Description: + Read-only attribute supported by most SoCs. Contains the SoC's + serial number, if available. + diff --git a/drivers/base/soc.c b/drivers/base/soc.c index 10b280f30217..b0933b9fe67f 100644 --- a/drivers/base/soc.c +++ b/drivers/base/soc.c @@ -35,0 +36 @@ static DEVICE_ATTR(family, S_IRUGO, soc_info_get, NULL); +static DEVICE_ATTR(serial_number, S_IRUGO, soc_info_get, NULL); @@ -59,0 +61,3 @@ static umode_t soc_attribute_mode(struct kobject *kobj, + if ((attr == &dev_attr_serial_number.attr) + && (soc_dev->attr->serial_number != NULL)) + return attr->mode; @@ -79,0 +84,2 @@ static ssize_t soc_info_get(struct device *dev, + if (attr == &dev_attr_serial_number) + return sprintf(buf, "%s\n", soc_dev->attr->serial_number); @@ -89,0 +96 @@ static struct attribute *soc_attr[] = { + &dev_attr_serial_number.attr, diff --git a/include/linux/sys_soc.h b/include/linux/sys_soc.h index b7c70c3e953f..48ceea867dd6 100644 --- a/include/linux/sys_soc.h +++ b/include/linux/sys_soc.h @@ -14,0 +15 @@ struct soc_device_attribute { + const char *serial_number; -- 2.17.1
