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Date: Tue, 14 Dec 2010 13:40:17 +0100
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...e.de>,
Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
Nicolas Ferre <nicolas.ferre@...el.com>,
Patrice VILCHEZ <patrice.vilchez@...el.com>
Subject: [PATCH] base: add sysfs socs info
this provide an easy way to register soc information
arch, family, model, id, revision
as this for at91sam9g20
$ cat /sys/devices/system/soc/soc0/arch
current
$ cat /sys/devices/system/soc/soc0/family
at91
$ cat /sys/devices/system/soc/soc0/id
at91sam9g20
$ cat /sys/devices/system/soc/soc0/model
0x00000000019905a0
$ cat /sys/devices/system/soc/soc0/revision
1.1
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Cc: Nicolas Ferre <nicolas.ferre@...el.com>
Cc: Patrice VILCHEZ <patrice.vilchez@...el.com>
---
drivers/base/Makefile | 3 +-
drivers/base/base.h | 1 +
drivers/base/init.c | 1 +
drivers/base/soc.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/soc.h | 27 +++++++++++
5 files changed, 155 insertions(+), 1 deletions(-)
create mode 100644 drivers/base/soc.c
create mode 100644 include/linux/soc.h
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 5f51c3b..cf3e59f 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -3,7 +3,8 @@
obj-y := core.o sys.o bus.o dd.o \
driver.o class.o platform.o \
cpu.o firmware.o init.o map.o devres.o \
- attribute_container.o transport_class.o
+ attribute_container.o transport_class.o \
+ soc.o
obj-$(CONFIG_DEVTMPFS) += devtmpfs.o
obj-y += power/
obj-$(CONFIG_HAS_DMA) += dma-mapping.o
diff --git a/drivers/base/base.h b/drivers/base/base.h
index 2ca7f5b..e2daaf6 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -107,6 +107,7 @@ static inline int hypervisor_init(void) { return 0; }
extern int platform_bus_init(void);
extern int system_bus_init(void);
extern int cpu_dev_init(void);
+extern int soc_dev_init(void);
extern int bus_add_device(struct device *dev);
extern void bus_probe_device(struct device *dev);
diff --git a/drivers/base/init.c b/drivers/base/init.c
index c8a934e..f908faa 100644
--- a/drivers/base/init.c
+++ b/drivers/base/init.c
@@ -33,5 +33,6 @@ void __init driver_init(void)
platform_bus_init();
system_bus_init();
cpu_dev_init();
+ soc_dev_init();
memory_dev_init();
}
diff --git a/drivers/base/soc.c b/drivers/base/soc.c
new file mode 100644
index 0000000..c24bb41
--- /dev/null
+++ b/drivers/base/soc.c
@@ -0,0 +1,124 @@
+/*
+ * drivers/base/soc.c - basic SOC class support
+ *
+ * Copyright (C) 2010 Jean-Chrisotphe PLAGNIOL-VILLARD * <plagnioj@...osoft.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/sysdev.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/soc.h>
+#include <linux/device.h>
+
+#include "base.h"
+
+static int nb_socs;
+
+struct sysdev_class soc_sysdev_class = {
+ .name = "soc",
+};
+EXPORT_SYMBOL_GPL(soc_sysdev_class);
+
+#define print_u64_attr(field) \
+static ssize_t print_socs_##field(struct sys_device *dev, \
+ struct sysdev_attribute *attr, char *buf) \
+{ \
+ struct soc *soc = container_of(dev, struct soc, sysdev); \
+ \
+ return sprintf(buf, "0x%016Lx\n", soc->field); \
+} \
+static SYSDEV_ATTR(field, 0444, print_socs_##field, NULL); \
+
+#define print_str_attr(field) \
+static ssize_t print_socs_##field(struct sys_device *dev, \
+ struct sysdev_attribute *attr, char *buf) \
+{ \
+ struct soc *soc = container_of(dev, struct soc, sysdev); \
+ \
+ return sprintf(buf, "%s\n", soc->field); \
+} \
+static SYSDEV_ATTR(field, 0444, print_socs_##field, NULL); \
+
+print_u64_attr(id)
+print_str_attr(arch)
+print_str_attr(family)
+print_str_attr(model)
+print_str_attr(revision)
+
+static char *arch_current = "current";
+/*
+ * register_soc - Setup a sysfs device for a SOC.
+ *
+ * Initialize and register the SOC device.
+ */
+int register_soc(struct soc *soc)
+{
+ int err;
+
+ if (!soc)
+ return -EINVAL;
+
+ soc->sysdev.id = nb_socs;
+ soc->sysdev.cls = &soc_sysdev_class;
+
+ if (!soc->arch)
+ soc->arch = arch_current;
+
+ err = sysdev_register(&soc->sysdev);
+
+ if (err)
+ return err;
+
+ err = sysdev_create_file(&soc->sysdev, &attr_arch);
+
+ if (err)
+ goto end;
+
+ err = sysdev_create_file(&soc->sysdev, &attr_family);
+
+ if (err)
+ goto end0;
+
+ err = sysdev_create_file(&soc->sysdev, &attr_model);
+
+ if (err)
+ goto end1;
+
+ err = sysdev_create_file(&soc->sysdev, &attr_id);
+
+ if (err)
+ goto end2;
+
+ err = sysdev_create_file(&soc->sysdev, &attr_revision);
+
+ if (err)
+ goto end3;
+
+ nb_socs++;
+
+ return 0;
+
+end3:
+ sysdev_remove_file(&soc->sysdev, &attr_id);
+end2:
+ sysdev_remove_file(&soc->sysdev, &attr_model);
+end1:
+ sysdev_remove_file(&soc->sysdev, &attr_family);
+end0:
+ sysdev_remove_file(&soc->sysdev, &attr_arch);
+end:
+ sysdev_unregister(&soc->sysdev);
+
+ return err;
+}
+
+int __init soc_dev_init(void)
+{
+ nb_socs = 0;
+
+ return sysdev_class_register(&soc_sysdev_class);
+}
diff --git a/include/linux/soc.h b/include/linux/soc.h
new file mode 100644
index 0000000..55e6ea2
--- /dev/null
+++ b/include/linux/soc.h
@@ -0,0 +1,27 @@
+/*
+ * include/linux/soc.h - generic soc definition
+ *
+ * Copyright (C) 2010 Jean-Chrisotphe PLAGNIOL-VILLARD * <plagnioj@...osoft.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _LINUX_SOC_H_
+#define _LINUX_OSC_H_
+
+#include <linux/sysdev.h>
+
+struct soc {
+ u64 id;
+ char *arch;
+ char *family;
+ char *model;
+ char *revision;
+ struct sys_device sysdev;
+};
+
+extern int register_soc(struct soc *soc);
+extern struct sysdev_class soc_sysdev_class;
+
+#endif /* _LINUX_SOC_H_ */
--
1.7.2.3
--
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