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Message-Id: <1250494649-13361-1-git-send-email-linus.walleij@stericsson.com>
Date: Mon, 17 Aug 2009 09:37:29 +0200
From: Linus Walleij <linus.walleij@...ricsson.com>
To: Samuel Ortiz <sameo@...ux.intel.com>, linux-kernel@...r.kernel.org
Cc: Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH] MFD AB3100 OTP readout
This adds the ability to read out OTP (One-Time Programmable)
registers in the AB3100 MFD ASIC. It's a simple sysfs file you
can cat to prompt. The OTP registers of the AB3100 are used to
store various device-unique information such as customer ID,
product flags and the 3GPP standard IMEI (International Mobile
Equipment Indentity) number.
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
drivers/mfd/Makefile | 2 +-
drivers/mfd/ab3100-otp.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 124 insertions(+), 1 deletions(-)
create mode 100644 drivers/mfd/ab3100-otp.c
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 6f8a9a1..13128b4 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -43,4 +43,4 @@ obj-$(CONFIG_PMIC_DA903X) += da903x.o
obj-$(CONFIG_MFD_PCF50633) += pcf50633-core.o
obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o
obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o
-obj-$(CONFIG_AB3100_CORE) += ab3100-core.o
+obj-$(CONFIG_AB3100_CORE) += ab3100-core.o ab3100-otp.o
diff --git a/drivers/mfd/ab3100-otp.c b/drivers/mfd/ab3100-otp.c
new file mode 100644
index 0000000..48d998c
--- /dev/null
+++ b/drivers/mfd/ab3100-otp.c
@@ -0,0 +1,123 @@
+/*
+ * drivers/mfd/ab3100_otp.c
+ *
+ * Copyright (C) 2007-2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * Driver to read out OTP from the AB3100 Mixed-signal circuit
+ * Author: Linus Walleij <linus.walleij@...ricsson.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/ab3100.h>
+
+/* The OTP registers */
+#define AB3100_OTP0 0xb0
+#define AB3100_OTP1 0xb1
+#define AB3100_OTP2 0xb2
+#define AB3100_OTP3 0xb3
+#define AB3100_OTP4 0xb4
+#define AB3100_OTP5 0xb5
+#define AB3100_OTP6 0xb6
+#define AB3100_OTP7 0xb7
+#define AB3100_OTPP 0xbf
+
+static ssize_t show_otp(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ab3100 *ab = dev_get_drvdata(dev);
+ u8 otpval[8];
+ u8 otpp;
+ u16 cid; /* Customer ID */
+ u32 tac; /* Type Allocation Code */
+ u8 fac; /* Final Assembly Code */
+ u32 svn; /* Software Version Number */
+ int err;
+ char *bufp = buf;
+
+ err = ab3100_get_register_interruptible(ab, AB3100_OTPP, &otpp);
+ if (err) {
+ printk(KERN_ERR "Unable to read OTPP register\n");
+ return err;
+ }
+
+ err = ab3100_get_register_page_interruptible(ab, AB3100_OTP0,
+ otpval, 8);
+ if (err) {
+ printk(KERN_ERR "Unable to read OTPO register\n");
+ return err;
+ }
+
+ bufp += sprintf(bufp, "OTP is %s\n",
+ (otpp & 0x80) ? "LOCKED" : "UNLOCKED");
+
+ bufp += sprintf(bufp, "OTP clock switch startup is %s\n",
+ (otpp & 0x40) ? "32kHz" : "34.1kHz (1MHz/30)");
+
+ bufp += sprintf(bufp, "PAF is %s\n",
+ (otpval[1] & 0x80) ? "SET" : "NOT SET");
+
+ bufp += sprintf(bufp, "IMEI is %s\n",
+ (otpval[1] & 0x40) ? "CHANGEABLE" : "NOT CHANGEABLE");
+
+ cid = ((otpval[1] << 8) | otpval[0]) & 0x3fff;
+ bufp += sprintf(bufp, "CID: 0x%04x (decimal: %d)\n", cid, cid);
+ tac = ((otpval[4] & 0x0f) << 16) | (otpval[3] << 8) | otpval[2];
+ fac = ((otpval[5] & 0x0f) << 4) | (otpval[4] >> 4);
+ svn = (otpval[7] << 12) | (otpval[6] << 4) | (otpval[5] >> 4);
+ bufp += sprintf(bufp, "IMEI: %u-%u-%u\n", tac, fac, svn);
+
+ return bufp-buf;
+}
+
+static DEVICE_ATTR(otp, S_IRUGO, show_otp, NULL);
+
+static int __init ab3100_otp_probe(struct platform_device *pdev)
+{
+ int err;
+
+ dev_info(&pdev->dev, "AB3100 OTP readout registered\n");
+
+ /* sysfs entries */
+ err = device_create_file(&pdev->dev, &dev_attr_otp);
+ if (err != 0) {
+ dev_err(&pdev->dev, "AB3100 OTP file registration failed!\n");
+ return err;
+ }
+ return 0;
+}
+
+static int __exit ab3100_otp_remove(struct platform_device *pdev)
+{
+ device_remove_file(&pdev->dev, &dev_attr_otp);
+
+ return 0;
+}
+
+static struct platform_driver ab3100_otp_driver = {
+ .driver = {
+ .name = "ab3100-otp",
+ .owner = THIS_MODULE,
+ },
+ .remove = __exit_p(ab3100_otp_remove),
+};
+
+static int __init ab3100_otp_init(void)
+{
+ return platform_driver_probe(&ab3100_otp_driver,
+ ab3100_otp_probe);
+}
+
+static void __exit ab3100_otp_exit(void)
+{
+ platform_driver_unregister(&ab3100_otp_driver);
+}
+
+module_init(ab3100_otp_init);
+module_exit(ab3100_otp_exit);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@...ricsson.com>");
+MODULE_DESCRIPTION("AB3100 OTP Readout Driver");
+MODULE_LICENSE("GPL");
--
1.6.2.1
--
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