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Date: Wed, 9 Mar 2011 17:59:20 +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 PATCHv1 1/2] Export SoC info through sysfs
Common base to export System-on-Chip related informations through sysfs.
Creation of a "soc" directory under /sys/devices/system/.
Creation of a common "mach_name" entry to export machine name.
Creation of platform-defined SoC information entries.
Signed-off-by: Maxime COQUELIN <maxime.coquelin-nonst@...ricsson.com>
---
drivers/base/Kconfig | 4 ++
drivers/base/Makefile | 1 +
drivers/base/soc.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/sys_soc.h | 33 +++++++++++++++++
4 files changed, 126 insertions(+), 0 deletions(-)
create mode 100644 drivers/base/soc.c
create mode 100644 include/linux/sys_soc.h
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index d57e8d0..4f2b56d 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -168,4 +168,8 @@ config SYS_HYPERVISOR
bool
default n
+config SYS_SOC
+ bool "Export SoC specific informations"
+ depends on EMBEDDED
+
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..6fa538b
--- /dev/null
+++ b/drivers/base/soc.c
@@ -0,0 +1,88 @@
+/*
+ * 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/sysdev.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+
+static struct sysdev_class_attribute *soc_default_attrs[];
+
+struct sys_soc {
+ char *mach_name;
+ struct sysdev_class class;
+};
+
+struct sys_soc soc = {
+ .class = {
+ .name = "soc",
+ .attrs = soc_default_attrs,
+ },
+};
+
+static ssize_t show_mach_name(struct sysdev_class *class,
+ struct sysdev_class_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%s\n", soc.mach_name);
+}
+static SYSDEV_CLASS_ATTR(mach_name, S_IRUGO, show_mach_name, NULL);
+
+static ssize_t show_info(struct sysdev_class *class,
+ struct sysdev_class_attribute *attr, char *buf)
+{
+ struct sys_soc_info *si = container_of(attr,
+ struct sys_soc_info, attr);
+
+ if (si->info)
+ return sprintf(buf, "%s\n", si->info);
+ else if (si->get_info)
+ return sprintf(buf, "%s\n", si->get_info(si));
+ else
+ return sprintf(buf, "No data\n");
+}
+
+void __init register_sys_soc_info(struct sys_soc_info *info, int nb_info)
+{
+ int i;
+
+ for (i = 0; i < nb_info; i++) {
+ info[i].attr.attr.name = info[i].name;
+ info[i].attr.attr.mode = S_IRUGO;
+ info[i].attr.show = show_info;
+
+ sysdev_class_create_file(&soc.class, &info[i].attr);
+ }
+}
+
+void __init register_sys_soc(char *name, struct sys_soc_info *info, int num)
+{
+ int len;
+
+ len = strlen(name);
+ soc.mach_name = kzalloc(len + 1, GFP_KERNEL);
+ if (!soc.mach_name)
+ return;
+
+ sprintf(soc.mach_name, "%s", name);
+
+ if (sysdev_class_register(&soc.class)) {
+ kfree(soc.mach_name);
+ return;
+ }
+
+ register_sys_soc_info(info, num);
+}
+
+/*
+ * Common attributes for all platforms.
+ * Only machine name for now
+ */
+static struct sysdev_class_attribute *soc_default_attrs[] = {
+ &attr_mach_name,
+ NULL
+};
diff --git a/include/linux/sys_soc.h b/include/linux/sys_soc.h
new file mode 100644
index 0000000..b91a924
--- /dev/null
+++ b/include/linux/sys_soc.h
@@ -0,0 +1,33 @@
+/*
+ * 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/sysdev.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 sys_soc_info {
+ char *name;
+ char *info;
+ char *(*get_info)(struct sys_soc_info *);
+ struct sysdev_class_attribute attr;
+};
+
+/**
+ * void register_sys_soc(char *name, struct sys_soc_info *, int num)
+ * @name: name of the machine
+ * @info: pointer on the info table to export
+ * @num: number of info to export
+ */
+void register_sys_soc(char *name, struct sys_soc_info *info, int num);
+
+#endif /* __SYS_SOC_H */
--
1.7.1
--
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