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@stericsson.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Linus Walleij
Samuel Ortiz
parent
295c08bc69
commit
12992dd89c
3 changed files with 278 additions and 0 deletions
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@ -276,6 +276,15 @@ config AB3100_CORE
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LEDs, vibrator, system power and temperature, power management
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and ALSA sound.
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config AB3100_OTP
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tristate "ST-Ericsson AB3100 OTP functions"
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depends on AB3100_CORE
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default y if AB3100_CORE
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help
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Select this to enable the AB3100 Mixed Signal IC OTP (one-time
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programmable memory) support. This exposes a sysfs file to read
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out OTP values.
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config EZX_PCAP
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bool "PCAP Support"
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depends on GENERIC_HARDIRQS && SPI_MASTER
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@ -48,3 +48,4 @@ obj-$(CONFIG_MFD_PCF50633) += pcf50633-core.o
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obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o
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obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o
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obj-$(CONFIG_AB3100_CORE) += ab3100-core.o
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obj-$(CONFIG_AB3100_OTP) += ab3100-otp.o
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268
drivers/mfd/ab3100-otp.c
Normal file
268
drivers/mfd/ab3100-otp.c
Normal file
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@ -0,0 +1,268 @@
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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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* License terms: GNU General Public License (GPL) version 2
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* Driver to read out OTP from the AB3100 Mixed-signal circuit
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* Author: Linus Walleij <linus.walleij@stericsson.com>
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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/init.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/ab3100.h>
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#include <linux/debugfs.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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* @ab3100 a pointer to the parent ab3100 device struct
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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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struct ab3100 *ab3100;
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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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struct ab3100 *ab = otp->ab3100;
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u8 otpval[8];
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u8 otpp;
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int err;
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err = ab3100_get_register_interruptible(ab, 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 = ab3100_get_register_page_interruptible(ab, AB3100_OTP0,
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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_DEBUGFS
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static int 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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int err;
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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_otp_show, 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 int __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,
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&ab3100_otp_operations);
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if (!otp->debugfs) {
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dev_err(dev, "AB3100 debugfs OTP file registration failed!\n");
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return err;
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}
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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_file(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 int __init ab3100_otp_init_debugfs(struct device *dev,
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struct ab3100_otp *otp)
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{
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return 0;
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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 = kzalloc(sizeof(struct ab3100_otp), GFP_KERNEL);
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if (!otp) {
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dev_err(&pdev->dev, "could not allocate AB3100 OTP device\n");
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return -ENOMEM;
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}
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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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otp->ab3100 = platform_get_drvdata(pdev);
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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 out_no_sysfs;
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}
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/* debugfs entries */
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err = ab3100_otp_init_debugfs(&pdev->dev, otp);
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if (err)
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goto out_no_debugfs;
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return 0;
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out_no_sysfs:
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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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out_no_debugfs:
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kfree(otp);
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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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kfree(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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.owner = THIS_MODULE,
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},
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.remove = __exit_p(ab3100_otp_remove),
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};
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static int __init ab3100_otp_init(void)
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{
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return platform_driver_probe(&ab3100_otp_driver,
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ab3100_otp_probe);
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}
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static void __exit ab3100_otp_exit(void)
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{
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platform_driver_unregister(&ab3100_otp_driver);
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}
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module_init(ab3100_otp_init);
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module_exit(ab3100_otp_exit);
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MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
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MODULE_DESCRIPTION("AB3100 OTP Readout Driver");
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MODULE_LICENSE("GPL");
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