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Date: Fri, 11 Mar 2011 13:35:10 +0100
From: Maxime Coquelin <maxime.coquelin-nonst@...ricsson.com>
To: LKML <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"eduardo.valentin@...ia.com" <eduardo.valentin@...ia.com>,
Saravana Kannan <skannan@...eaurora.org>,
Ryan Mallon <ryan@...ewatersys.com>,
Linus Walleij <linus.walleij@...aro.org>
Cc: <maxime_coquelin@...oo.fr>, ext Nishanth Menon <nm@...com>,
ext Tony Lindgren <tony@...mide.com>,
Peter De-Schrijver <Peter.De-Schrijver@...ia.com>,
Ambresh <a0393775@...com>,
Jouni Hogander <jouni.hogander@...ia.com>,
Lee Jones <Lee.Jones@...aro.org>,
Rabin VINCENT <rabin.vincent@...ricsson.com>,
Russell King <linux@....linux.org.uk>,
Jonas ABERG <jonas.aberg@...ricsson.com>,
ext Kevin Hilman <khilman@...prootsystems.com>,
David Brown <davidb@...eaurora.org>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
Loic PALLARDY <loic.pallardy@...ricsson.com>,
Linux-OMAP <linux-omap@...r.kernel.org>,
Daniel Walker <dwalker@...eaurora.org>,
Andrei Warkentin <andreiw@...orola.com>,
Paul Mundt <lethal@...ux-sh.org>,
"santosh.shilimkar@...com" <santosh.shilimkar@...com>,
Andrew Morton <akpm@...ux-foundation.org>,
Maxime Coquelin <maxime.coquelin-nonst@...ricsson.com>
Subject: [RFC PATCHv2 1/2] Export SoC info through sysfs
Common base to export System-on-Chip related informations through sysfs.
Creation of a "socinfo" directory under /sys/.
Creation of SoC information entries.
Signed-off-by: Maxime COQUELIN <maxime.coquelin-nonst@...ricsson.com>
---
Documentation/ABI/testing/sysfs-socinfo | 16 ++++++
drivers/base/Kconfig | 3 +
drivers/base/Makefile | 1 +
drivers/base/soc.c | 79 +++++++++++++++++++++++++++++++
include/linux/sys_soc.h | 50 +++++++++++++++++++
5 files changed, 149 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-socinfo
create mode 100644 drivers/base/soc.c
create mode 100644 include/linux/sys_soc.h
diff --git a/Documentation/ABI/testing/sysfs-socinfo b/Documentation/ABI/testing/sysfs-socinfo
new file mode 100644
index 0000000..afd9da2
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-socinfo
@@ -0,0 +1,16 @@
+What: /sys/socinfo
+Date: March 2011
+contact: Maxime Coquelin <maxime.coquelin-nonst@...ricsson.com>
+Description:
+ The /sys/socinfo directory contains information about the
+ System-on-Chip. It is only available if platform implements it.
+ This directory contains two kind of attributes :
+ - common attributes:
+ * machine: the name of the machine.
+ * family: the family name of the SoC
+ - SoC-specific attributes: The SoC vendor can declare attributes
+ to export some strings to user-space, like the serial-number for
+ example.
+
+Users:
+ User-space applications which needs these kind of attributes.
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index d57e8d0..372ef3a 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -168,4 +168,7 @@ config SYS_HYPERVISOR
bool
default n
+config SYS_SOC
+ bool
+
endmenu
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 5f51c3b..f3bcfb3 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -18,6 +18,7 @@ ifeq ($(CONFIG_SYSFS),y)
obj-$(CONFIG_MODULES) += module.o
endif
obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o
+obj-$(CONFIG_SYS_SOC) += soc.o
ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
diff --git a/drivers/base/soc.c b/drivers/base/soc.c
new file mode 100644
index 0000000..046b43b
--- /dev/null
+++ b/drivers/base/soc.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ * Author: Maxime Coquelin <maxime.coquelin-nonst@...ricsson.com> for ST-Ericsson.
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+
+struct kobject *soc_object;
+
+ssize_t show_soc_info(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct sysfs_soc_info *si = container_of(attr,
+ struct sysfs_soc_info, attr);
+
+ if (si->info)
+ return sprintf(buf, "%s\n", si->info);
+
+ return si->get_info(buf, si);
+}
+
+int __init register_sysfs_soc_info(struct sysfs_soc_info *info, int nb_info)
+{
+ int i, ret;
+
+ for (i = 0; i < nb_info; i++) {
+ ret = sysfs_create_file(soc_object, &info[i].attr.attr);
+ if (ret) {
+ for (i -= 1; i >= 0; i--)
+ sysfs_remove_file(soc_object, &info[i].attr.attr);
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static struct attribute *soc_attrs[] = {
+ NULL,
+};
+
+static struct attribute_group soc_attr_group = {
+ .attrs = soc_attrs,
+};
+
+int __init register_sysfs_soc(struct sysfs_soc_info *info, size_t num)
+{
+ int ret;
+
+ soc_object = kobject_create_and_add("socinfo", NULL);
+ if (!soc_object) {
+ ret = -ENOMEM;
+ goto exit;
+ }
+
+ ret = sysfs_create_group(soc_object, &soc_attr_group);
+ if (ret)
+ goto kset_exit;
+
+ ret = register_sysfs_soc_info(info, num);
+ if (ret)
+ goto group_exit;
+
+ return 0;
+
+group_exit:
+ sysfs_remove_group(soc_object, &soc_attr_group);
+kset_exit:
+ kobject_put(soc_object);
+exit:
+ return ret;
+}
+
diff --git a/include/linux/sys_soc.h b/include/linux/sys_soc.h
new file mode 100644
index 0000000..05e5529
--- /dev/null
+++ b/include/linux/sys_soc.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ * Author: Maxime Coquelin <maxime.coquelin-nonst@...ricsson.com> for ST-Ericsson.
+ * License terms: GNU General Public License (GPL), version 2
+ */
+#ifndef __SYS_SOC_H
+#define __SYS_SOC_H
+
+#include <linux/kobject.h>
+
+/**
+ * struct sys_soc_info - SoC exports related informations
+ * @name: name of the export
+ * @info: pointer on the key to export
+ * @get_info: callback to retrieve key if info field is NULL
+ * @attr: export's sysdev class attribute
+ */
+struct sysfs_soc_info {
+ const char *info;
+ ssize_t (*get_info)(char *buf, struct sysfs_soc_info *);
+ struct kobj_attribute attr;
+};
+
+ssize_t show_soc_info(struct kobject *, struct kobj_attribute *, char *);
+
+#define SYSFS_SOC_ATTR_VALUE(_name, _value) { \
+ .attr.attr.name = _name, \
+ .attr.attr.mode = S_IRUGO, \
+ .attr.show = show_soc_info, \
+ .info = _value, \
+}
+
+#define SYSFS_SOC_ATTR_CALLBACK(_name, _callback) { \
+ .attr.attr.name = _name, \
+ .attr.attr.mode = S_IRUGO, \
+ .attr.show = show_soc_info, \
+ .get_info = _callback, \
+}
+
+/**
+ * register_sys_soc - register the soc information
+ * @name: name of the machine
+ * @info: pointer on the info table to export
+ * @num: number of info to export
+ *
+ * NOTE: This function must only be called once
+ */
+int register_sysfs_soc(struct sysfs_soc_info *info, size_t num);
+
+#endif /* __SYS_SOC_H */
--
1.7.1
--
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