Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 240 insertions, 0 deletions

diff --git a/drivers/mfd/ab3100-otp.c b/drivers/mfd/ab3100-otp.c
new file mode 100644
index 000000000..c393102e3
--- /dev/null
+++ b/drivers/mfd/ab3100-otp.c
@@ -0,0 +1,240 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * drivers/mfd/ab3100_otp.c
+ *
+ * Copyright (C) 2007-2009 ST-Ericsson AB
+ * 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 void __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);
+}
+
+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 void __init ab3100_otp_init_debugfs(struct device *dev,
+						  struct ab3100_otp *otp)
+{
+}
+
+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)
+		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 */
+	ab3100_otp_init_debugfs(&pdev->dev, otp);
+
+	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");