--- /dev/null
+/*
+ * 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@stericsson.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/abx500.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.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
+
+/**
+ * struct ab3100_otp
+ * @dev containing device
+ * @locked whether the OTP is locked, after locking, no more bits
+ * can be changed but before locking it is still possible
+ * to change bits from 1->0.
+ * @freq clocking frequency for the OTP, this frequency is either
+ * 32768Hz or 1MHz/30
+ * @paf product activation flag, indicates whether this is a real
+ * product (paf true) or a lab board etc (paf false)
+ * @imeich if this is set it is possible to override the
+ * IMEI number found in the tac, fac and svn fields with
+ * (secured) software
+ * @cid customer ID
+ * @tac type allocation code of the IMEI
+ * @fac final assembly code of the IMEI
+ * @svn software version number of the IMEI
+ * @debugfs a debugfs file used when dumping to file
+ */
+struct ab3100_otp {
+ struct device *dev;
+ bool locked;
+ u32 freq;
+ bool paf;
+ bool imeich;
+ u16 cid:14;
+ u32 tac:20;
+ u8 fac;
+ u32 svn:20;
+ struct dentry *debugfs;
+};
+
+static int __init ab3100_otp_read(struct ab3100_otp *otp)
+{
+ u8 otpval[8];
+ u8 otpp;
+ int err;
+
+ err = abx500_get_register_interruptible(otp->dev, 0,
+ AB3100_OTPP, &otpp);
+ if (err) {
+ dev_err(otp->dev, "unable to read OTPP register\n");
+ return err;
+ }
+
+ err = abx500_get_register_page_interruptible(otp->dev, 0,
+ AB3100_OTP0, otpval, 8);
+ if (err) {
+ dev_err(otp->dev, "unable to read OTP register page\n");
+ return err;
+ }
+
+ /* Cache OTP properties, they never change by nature */
+ otp->locked = (otpp & 0x80);
+ otp->freq = (otpp & 0x40) ? 32768 : 34100;
+ otp->paf = (otpval[1] & 0x80);
+ otp->imeich = (otpval[1] & 0x40);
+ otp->cid = ((otpval[1] << 8) | otpval[0]) & 0x3fff;
+ otp->tac = ((otpval[4] & 0x0f) << 16) | (otpval[3] << 8) | otpval[2];
+ otp->fac = ((otpval[5] & 0x0f) << 4) | (otpval[4] >> 4);
+ otp->svn = (otpval[7] << 12) | (otpval[6] << 4) | (otpval[5] >> 4);
+ return 0;
+}
+
+/*
+ * This is a simple debugfs human-readable file that dumps out
+ * the contents of the OTP.
+ */
+#ifdef CONFIG_DEBUG_FS
+static int ab3100_show_otp(struct seq_file *s, void *v)
+{
+ struct ab3100_otp *otp = s->private;
+
+ seq_printf(s, "OTP is %s\n", otp->locked ? "LOCKED" : "UNLOCKED");
+ seq_printf(s, "OTP clock switch startup is %uHz\n", otp->freq);
+ seq_printf(s, "PAF is %s\n", otp->paf ? "SET" : "NOT SET");
+ seq_printf(s, "IMEI is %s\n", otp->imeich ?
+ "CHANGEABLE" : "NOT CHANGEABLE");
+ seq_printf(s, "CID: 0x%04x (decimal: %d)\n", otp->cid, otp->cid);
+ seq_printf(s, "IMEI: %u-%u-%u\n", otp->tac, otp->fac, otp->svn);
+ return 0;
+}
+
+static int ab3100_otp_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ab3100_show_otp, inode->i_private);
+}
+
+static const struct file_operations ab3100_otp_operations = {
+ .open = ab3100_otp_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init ab3100_otp_init_debugfs(struct device *dev,
+ struct ab3100_otp *otp)
+{
+ otp->debugfs = debugfs_create_file("ab3100_otp", S_IFREG | S_IRUGO,
+ NULL, otp,
+ &ab3100_otp_operations);
+ if (!otp->debugfs) {
+ dev_err(dev, "AB3100 debugfs OTP file registration failed!\n");
+ return -ENOENT;
+ }
+ return 0;
+}
+
+static void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp)
+{
+ debugfs_remove(otp->debugfs);
+}
+#else
+/* Compile this out if debugfs not selected */
+static inline int __init ab3100_otp_init_debugfs(struct device *dev,
+ struct ab3100_otp *otp)
+{
+ return 0;
+}
+
+static inline void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp)
+{
+}
+#endif
+
+#define SHOW_AB3100_ATTR(name) \
+static ssize_t ab3100_otp_##name##_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{\
+ struct ab3100_otp *otp = dev_get_drvdata(dev); \
+ return sprintf(buf, "%u\n", otp->name); \
+}
+
+SHOW_AB3100_ATTR(locked)
+SHOW_AB3100_ATTR(freq)
+SHOW_AB3100_ATTR(paf)
+SHOW_AB3100_ATTR(imeich)
+SHOW_AB3100_ATTR(cid)
+SHOW_AB3100_ATTR(fac)
+SHOW_AB3100_ATTR(tac)
+SHOW_AB3100_ATTR(svn)
+
+static struct device_attribute ab3100_otp_attrs[] = {
+ __ATTR(locked, S_IRUGO, ab3100_otp_locked_show, NULL),
+ __ATTR(freq, S_IRUGO, ab3100_otp_freq_show, NULL),
+ __ATTR(paf, S_IRUGO, ab3100_otp_paf_show, NULL),
+ __ATTR(imeich, S_IRUGO, ab3100_otp_imeich_show, NULL),
+ __ATTR(cid, S_IRUGO, ab3100_otp_cid_show, NULL),
+ __ATTR(fac, S_IRUGO, ab3100_otp_fac_show, NULL),
+ __ATTR(tac, S_IRUGO, ab3100_otp_tac_show, NULL),
+ __ATTR(svn, S_IRUGO, ab3100_otp_svn_show, NULL),
+};
+
+static int __init ab3100_otp_probe(struct platform_device *pdev)
+{
+ struct ab3100_otp *otp;
+ int err = 0;
+ int i;
+
+ otp = devm_kzalloc(&pdev->dev, sizeof(struct ab3100_otp), GFP_KERNEL);
+ if (!otp) {
+ dev_err(&pdev->dev, "could not allocate AB3100 OTP device\n");
+ return -ENOMEM;
+ }
+ otp->dev = &pdev->dev;
+
+ /* Replace platform data coming in with a local struct */
+ platform_set_drvdata(pdev, otp);
+
+ err = ab3100_otp_read(otp);
+ if (err)
+ return err;
+
+ dev_info(&pdev->dev, "AB3100 OTP readout registered\n");
+
+ /* sysfs entries */
+ for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++) {
+ err = device_create_file(&pdev->dev,
+ &ab3100_otp_attrs[i]);
+ if (err)
+ goto err;
+ }
+
+ /* debugfs entries */
+ err = ab3100_otp_init_debugfs(&pdev->dev, otp);
+ if (err)
+ goto err;
+
+ return 0;
+
+err:
+ while (--i >= 0)
+ device_remove_file(&pdev->dev, &ab3100_otp_attrs[i]);
+ return err;
+}
+
+static int __exit ab3100_otp_remove(struct platform_device *pdev)
+{
+ struct ab3100_otp *otp = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++)
+ device_remove_file(&pdev->dev,
+ &ab3100_otp_attrs[i]);
+ ab3100_otp_exit_debugfs(otp);
+ return 0;
+}
+
+static struct platform_driver ab3100_otp_driver = {
+ .driver = {
+ .name = "ab3100-otp",
+ },
+ .remove = __exit_p(ab3100_otp_remove),
+};
+
+module_platform_driver_probe(ab3100_otp_driver, ab3100_otp_probe);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
+MODULE_DESCRIPTION("AB3100 OTP Readout Driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff