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240 lines
6.3 KiB
240 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* drivers/mfd/ab3100_otp.c |
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* |
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* Copyright (C) 2007-2009 ST-Ericsson AB |
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* Driver to read out OTP from the AB3100 Mixed-signal circuit |
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* Author: Linus Walleij <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/platform_device.h> |
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#include <linux/mfd/abx500.h> |
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#include <linux/debugfs.h> |
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#include <linux/seq_file.h> |
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/* The OTP registers */ |
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#define AB3100_OTP0 0xb0 |
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#define AB3100_OTP1 0xb1 |
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#define AB3100_OTP2 0xb2 |
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#define AB3100_OTP3 0xb3 |
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#define AB3100_OTP4 0xb4 |
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#define AB3100_OTP5 0xb5 |
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#define AB3100_OTP6 0xb6 |
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#define AB3100_OTP7 0xb7 |
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#define AB3100_OTPP 0xbf |
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/** |
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* struct ab3100_otp |
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* @dev: containing device |
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* @locked: whether the OTP is locked, after locking, no more bits |
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* can be changed but before locking it is still possible |
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* to change bits from 1->0. |
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* @freq: clocking frequency for the OTP, this frequency is either |
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* 32768Hz or 1MHz/30 |
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* @paf: product activation flag, indicates whether this is a real |
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* product (paf true) or a lab board etc (paf false) |
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* @imeich: if this is set it is possible to override the |
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* IMEI number found in the tac, fac and svn fields with |
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* (secured) software |
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* @cid: customer ID |
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* @tac: type allocation code of the IMEI |
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* @fac: final assembly code of the IMEI |
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* @svn: software version number of the IMEI |
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* @debugfs: a debugfs file used when dumping to file |
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*/ |
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struct ab3100_otp { |
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struct device *dev; |
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bool locked; |
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u32 freq; |
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bool paf; |
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bool imeich; |
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u16 cid:14; |
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u32 tac:20; |
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u8 fac; |
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u32 svn:20; |
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struct dentry *debugfs; |
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}; |
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static int __init ab3100_otp_read(struct ab3100_otp *otp) |
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{ |
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u8 otpval[8]; |
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u8 otpp; |
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int err; |
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err = abx500_get_register_interruptible(otp->dev, 0, |
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AB3100_OTPP, &otpp); |
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if (err) { |
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dev_err(otp->dev, "unable to read OTPP register\n"); |
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return err; |
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} |
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err = abx500_get_register_page_interruptible(otp->dev, 0, |
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AB3100_OTP0, otpval, 8); |
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if (err) { |
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dev_err(otp->dev, "unable to read OTP register page\n"); |
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return err; |
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} |
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/* Cache OTP properties, they never change by nature */ |
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otp->locked = (otpp & 0x80); |
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otp->freq = (otpp & 0x40) ? 32768 : 34100; |
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otp->paf = (otpval[1] & 0x80); |
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otp->imeich = (otpval[1] & 0x40); |
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otp->cid = ((otpval[1] << 8) | otpval[0]) & 0x3fff; |
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otp->tac = ((otpval[4] & 0x0f) << 16) | (otpval[3] << 8) | otpval[2]; |
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otp->fac = ((otpval[5] & 0x0f) << 4) | (otpval[4] >> 4); |
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otp->svn = (otpval[7] << 12) | (otpval[6] << 4) | (otpval[5] >> 4); |
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return 0; |
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} |
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/* |
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* This is a simple debugfs human-readable file that dumps out |
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* the contents of the OTP. |
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*/ |
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#ifdef CONFIG_DEBUG_FS |
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static int ab3100_show_otp(struct seq_file *s, void *v) |
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{ |
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struct ab3100_otp *otp = s->private; |
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seq_printf(s, "OTP is %s\n", otp->locked ? "LOCKED" : "UNLOCKED"); |
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seq_printf(s, "OTP clock switch startup is %uHz\n", otp->freq); |
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seq_printf(s, "PAF is %s\n", otp->paf ? "SET" : "NOT SET"); |
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seq_printf(s, "IMEI is %s\n", otp->imeich ? |
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"CHANGEABLE" : "NOT CHANGEABLE"); |
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seq_printf(s, "CID: 0x%04x (decimal: %d)\n", otp->cid, otp->cid); |
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seq_printf(s, "IMEI: %u-%u-%u\n", otp->tac, otp->fac, otp->svn); |
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return 0; |
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} |
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static int ab3100_otp_open(struct inode *inode, struct file *file) |
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{ |
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return single_open(file, ab3100_show_otp, inode->i_private); |
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} |
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static const struct file_operations ab3100_otp_operations = { |
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.open = ab3100_otp_open, |
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.read = seq_read, |
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.llseek = seq_lseek, |
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.release = single_release, |
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}; |
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static void __init ab3100_otp_init_debugfs(struct device *dev, |
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struct ab3100_otp *otp) |
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{ |
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otp->debugfs = debugfs_create_file("ab3100_otp", S_IFREG | S_IRUGO, |
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NULL, otp, &ab3100_otp_operations); |
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} |
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static void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp) |
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{ |
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debugfs_remove(otp->debugfs); |
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} |
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#else |
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/* Compile this out if debugfs not selected */ |
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static inline void __init ab3100_otp_init_debugfs(struct device *dev, |
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struct ab3100_otp *otp) |
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{ |
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} |
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static inline void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp) |
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{ |
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} |
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#endif |
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#define SHOW_AB3100_ATTR(name) \ |
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static ssize_t ab3100_otp_##name##_show(struct device *dev, \ |
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struct device_attribute *attr, \ |
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char *buf) \ |
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{\ |
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struct ab3100_otp *otp = dev_get_drvdata(dev); \ |
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return sprintf(buf, "%u\n", otp->name); \ |
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} |
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SHOW_AB3100_ATTR(locked) |
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SHOW_AB3100_ATTR(freq) |
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SHOW_AB3100_ATTR(paf) |
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SHOW_AB3100_ATTR(imeich) |
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SHOW_AB3100_ATTR(cid) |
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SHOW_AB3100_ATTR(fac) |
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SHOW_AB3100_ATTR(tac) |
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SHOW_AB3100_ATTR(svn) |
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static struct device_attribute ab3100_otp_attrs[] = { |
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__ATTR(locked, S_IRUGO, ab3100_otp_locked_show, NULL), |
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__ATTR(freq, S_IRUGO, ab3100_otp_freq_show, NULL), |
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__ATTR(paf, S_IRUGO, ab3100_otp_paf_show, NULL), |
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__ATTR(imeich, S_IRUGO, ab3100_otp_imeich_show, NULL), |
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__ATTR(cid, S_IRUGO, ab3100_otp_cid_show, NULL), |
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__ATTR(fac, S_IRUGO, ab3100_otp_fac_show, NULL), |
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__ATTR(tac, S_IRUGO, ab3100_otp_tac_show, NULL), |
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__ATTR(svn, S_IRUGO, ab3100_otp_svn_show, NULL), |
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}; |
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static int __init ab3100_otp_probe(struct platform_device *pdev) |
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{ |
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struct ab3100_otp *otp; |
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int err = 0; |
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int i; |
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otp = devm_kzalloc(&pdev->dev, sizeof(struct ab3100_otp), GFP_KERNEL); |
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if (!otp) |
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return -ENOMEM; |
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otp->dev = &pdev->dev; |
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/* Replace platform data coming in with a local struct */ |
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platform_set_drvdata(pdev, otp); |
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err = ab3100_otp_read(otp); |
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if (err) |
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return err; |
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dev_info(&pdev->dev, "AB3100 OTP readout registered\n"); |
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/* sysfs entries */ |
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for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++) { |
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err = device_create_file(&pdev->dev, |
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&ab3100_otp_attrs[i]); |
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if (err) |
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goto err; |
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} |
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/* debugfs entries */ |
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ab3100_otp_init_debugfs(&pdev->dev, otp); |
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return 0; |
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err: |
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while (--i >= 0) |
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device_remove_file(&pdev->dev, &ab3100_otp_attrs[i]); |
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return err; |
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} |
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static int __exit ab3100_otp_remove(struct platform_device *pdev) |
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{ |
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struct ab3100_otp *otp = platform_get_drvdata(pdev); |
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int i; |
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for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++) |
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device_remove_file(&pdev->dev, |
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&ab3100_otp_attrs[i]); |
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ab3100_otp_exit_debugfs(otp); |
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return 0; |
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} |
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static struct platform_driver ab3100_otp_driver = { |
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.driver = { |
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.name = "ab3100-otp", |
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}, |
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.remove = __exit_p(ab3100_otp_remove), |
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}; |
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module_platform_driver_probe(ab3100_otp_driver, ab3100_otp_probe); |
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MODULE_AUTHOR("Linus Walleij <[email protected]>"); |
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MODULE_DESCRIPTION("AB3100 OTP Readout Driver"); |
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MODULE_LICENSE("GPL");
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