linux-kernel - [PATCH] arm: tegra: fuse: export chip id and revision

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Message-ID: <1363005441-26329-1-git-send-email-dahuang@nvidia.com>
Date:	Mon, 11 Mar 2013 20:37:21 +0800
From:	Danny Huang <dahuang@...dia.com>
To:	<linux@....linux.org.uk>, <swarren@...dotorg.org>,
	<dahuang@...dia.com>, <ldewangan@...dia.com>,
	<pgaikwad@...dia.com>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] arm: tegra: fuse: export chip id and revision

Expose tegra chip id and revision in /proc/cpu/chipinfo for user mode
usage.

Signed-off-by: Danny Huang <dahuang@...dia.com>
---
 arch/arm/mach-tegra/fuse.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/arm/mach-tegra/fuse.c b/arch/arm/mach-tegra/fuse.c
index f7db078..7895542 100644
--- a/arch/arm/mach-tegra/fuse.c
+++ b/arch/arm/mach-tegra/fuse.c
@@ -20,6 +20,7 @@
 #include <linux/kernel.h>
 #include <linux/io.h>
 #include <linux/export.h>
+#include <linux/proc_fs.h>
 #include <linux/tegra-soc.h>
 
 #include "fuse.h"
@@ -43,6 +44,7 @@ enum tegra_revision tegra_revision;
 
 static int tegra_fuse_spare_bit;
 static void (*tegra_init_speedo_data)(void);
+static struct proc_dir_entry *proc_entry;
 
 /* The BCT to use at boot is specified by board straps that can be read
  * through a APB misc register and decoded. 2 bits, i.e. 4 possible BCTs.
@@ -161,3 +163,20 @@ unsigned long long tegra_chip_uid(void)
 	return (hi << 32ull) | lo;
 }
 EXPORT_SYMBOL(tegra_chip_uid);
+
+static int show_chip_info(char *page, char **start, off_t offset,
+			    int count, int *eof, void *data)
+{
+	return snprintf(page, count, "tegra_chip_id: %d\ntegra_chip_rev: %d\n",
+			tegra_chip_id, tegra_revision);
+}
+
+static int __init tegra_chip_info(void)
+{
+	proc_entry = create_proc_entry("cpu/chipinfo", S_IRUGO, NULL);
+	if (proc_entry)
+		proc_entry->read_proc = show_chip_info;
+	return 0;
+}
+
+late_initcall(tegra_chip_info);
-- 
1.8.1.5

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