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Message-Id: <1273587331-24604-2-git-send-email-eduardo.valentin@nokia.com>
Date: Tue, 11 May 2010 17:15:29 +0300
From: Eduardo Valentin <eduardo.valentin@...ia.com>
To: LKML <linux-kernel@...r.kernel.org>,
linux-arm-kernel@...ts.infradead.org,
Linux-OMAP <linux-omap@...r.kernel.org>
Cc: Russell King <linux@....linux.org.uk>,
Andrew Morton <akpm@...ux-foundation.org>,
ext Tony Lindgren <tony@...mide.com>,
ext Kevin Hilman <khilman@...prootsystems.com>,
Peter De-Schrijver <Peter.De-Schrijver@...ia.com>,
santosh.shilimkar@...com, Ambresh <a0393775@...com>,
felipe.balbi@...ia.com, Jouni Hogander <jouni.hogander@...ia.com>,
Paul Mundt <lethal@...ux-sh.org>,
Eduardo Valentin <eduardo.valentin@...ia.com>
Subject: [PATCHv5 1/3] procfs: Introduce socinfo under /proc
From: Eduardo Valentin <eduardo.valentin@...ia.com>
This patch introduce the /proc/socinfo node. Its purpose is to
export System on Chip information and specific bits.
Signed-off-by: Eduardo Valentin <eduardo.valentin@...ia.com>
---
Documentation/filesystems/proc.txt | 1 +
fs/proc/Kconfig | 7 +++
fs/proc/Makefile | 1 +
fs/proc/socinfo.c | 80 ++++++++++++++++++++++++++++++++++++
include/linux/socinfo.h | 17 ++++++++
5 files changed, 106 insertions(+), 0 deletions(-)
create mode 100644 fs/proc/socinfo.c
create mode 100644 include/linux/socinfo.h
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index a4f30fa..039bcb7 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -415,6 +415,7 @@ Table 1-5: Kernel info in /proc
bus Directory containing bus specific information
cmdline Kernel command line
cpuinfo Info about the CPU
+ socinfo Info about the System on Chip
devices Available devices (block and character)
dma Used DMS channels
filesystems Supported filesystems
diff --git a/fs/proc/Kconfig b/fs/proc/Kconfig
index 50f8f06..e683d62 100644
--- a/fs/proc/Kconfig
+++ b/fs/proc/Kconfig
@@ -67,3 +67,10 @@ config PROC_PAGE_MONITOR
/proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
/proc/kpagecount, and /proc/kpageflags. Disabling these
interfaces will reduce the size of the kernel by approximately 4kb.
+
+config PROC_SOCINFO
+ default y
+ depends on PROC_FS
+ bool "Enable /proc/socinfo" if EMBEDDED
+ help
+ Say Y here if you need to see information about the your System on Chip.
diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index 11a7b5c..7757d44 100644
--- a/fs/proc/Makefile
+++ b/fs/proc/Makefile
@@ -26,3 +26,4 @@ proc-$(CONFIG_PROC_VMCORE) += vmcore.o
proc-$(CONFIG_PROC_DEVICETREE) += proc_devtree.o
proc-$(CONFIG_PRINTK) += kmsg.o
proc-$(CONFIG_PROC_PAGE_MONITOR) += page.o
+proc-$(CONFIG_PROC_SOCINFO) += socinfo.o
diff --git a/fs/proc/socinfo.c b/fs/proc/socinfo.c
new file mode 100644
index 0000000..09a889d
--- /dev/null
+++ b/fs/proc/socinfo.c
@@ -0,0 +1,80 @@
+/*
+ * fs/proc/socinfo.c
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ *
+ * Contact: Eduardo Valentin <eduardo.valentin@...ia.com>
+ *
+ * proc socinfo file
+ */
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/socinfo.h>
+
+/*
+ * Function pointer to soc core code which knows how to grab soc info
+ */
+static int (*socinfo_show)(struct seq_file *, void *);
+static void *socinfo_data;
+static DEFINE_MUTEX(socinfo_mutex);
+
+/**
+ * register_socinfo_show() - register a call back to provide SoC information
+ * @show: The function callback. It is expected to be in the same format
+ * as the .show of struct seq_operations.
+ * @data: A void * which will be passed as argument when show is called.
+ *
+ * This function will store the reference for a function and its data. The show
+ * argument will be called when filling up the seq_file of /proc/socinfo.
+ * Usually, this function should be called just once, while executing the SoC
+ * core initialization code.
+ */
+void register_socinfo_show(int (*show)(struct seq_file *, void *), void *data)
+{
+ mutex_lock(&socinfo_mutex);
+ socinfo_show = show;
+ socinfo_data = data;
+ mutex_unlock(&socinfo_mutex);
+}
+
+static int socinfo_show_local(struct seq_file *sfile, void *data)
+{
+ int r;
+
+ /* Just fall back to those who know how to grab the info */
+ mutex_lock(&socinfo_mutex);
+ if (socinfo_show)
+ r = socinfo_show(sfile, socinfo_data);
+ else
+ r = seq_printf(sfile, "No data\n");
+ mutex_unlock(&socinfo_mutex);
+
+ return r;
+}
+
+static int socinfo_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, socinfo_show_local, NULL);
+}
+
+static const struct file_operations proc_socinfo_operations = {
+ .owner = THIS_MODULE,
+ .open = socinfo_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init proc_socinfo_init(void)
+{
+ if (!proc_create("socinfo", 0, NULL, &proc_socinfo_operations)) {
+ pr_info("Failed to create /proc/socinfo\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+module_init(proc_socinfo_init);
diff --git a/include/linux/socinfo.h b/include/linux/socinfo.h
new file mode 100644
index 0000000..aa870f1
--- /dev/null
+++ b/include/linux/socinfo.h
@@ -0,0 +1,17 @@
+/*
+ * include/linux/socinfo.h
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ *
+ * Contact: Eduardo Valentin <eduardo.valentin@...ia.com>
+ *
+ * proc socinfo file
+ */
+
+#ifndef __SOCINFO_H
+#define __SOCINFO_H
+
+#include <linux/seq_file.h>
+
+void register_socinfo_show(int (*show)(struct seq_file *, void *), void *data);
+#endif
--
1.7.0.4.361.g8b5fe.dirty
--
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