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:
parent
295c08bc69
commit
12992dd89c
|
@ -276,6 +276,15 @@ config AB3100_CORE
|
|||
LEDs, vibrator, system power and temperature, power management
|
||||
and ALSA sound.
|
||||
|
||||
config AB3100_OTP
|
||||
tristate "ST-Ericsson AB3100 OTP functions"
|
||||
depends on AB3100_CORE
|
||||
default y if AB3100_CORE
|
||||
help
|
||||
Select this to enable the AB3100 Mixed Signal IC OTP (one-time
|
||||
programmable memory) support. This exposes a sysfs file to read
|
||||
out OTP values.
|
||||
|
||||
config EZX_PCAP
|
||||
bool "PCAP Support"
|
||||
depends on GENERIC_HARDIRQS && SPI_MASTER
|
||||
|
|
|
@ -48,3 +48,4 @@ 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_OTP) += ab3100-otp.o
|
||||
|
|
268
drivers/mfd/ab3100-otp.c
Normal file
268
drivers/mfd/ab3100-otp.c
Normal file
|
@ -0,0 +1,268 @@
|
|||
/*
|
||||
* 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/init.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/mfd/ab3100.h>
|
||||
#include <linux/debugfs.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
|
||||
* @ab3100 a pointer to the parent ab3100 device struct
|
||||
* @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;
|
||||
struct ab3100 *ab3100;
|
||||
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)
|
||||
{
|
||||
struct ab3100 *ab = otp->ab3100;
|
||||
u8 otpval[8];
|
||||
u8 otpp;
|
||||
int err;
|
||||
|
||||
err = ab3100_get_register_interruptible(ab, AB3100_OTPP, &otpp);
|
||||
if (err) {
|
||||
dev_err(otp->dev, "unable to read OTPP register\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
err = ab3100_get_register_page_interruptible(ab, 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_DEBUGFS
|
||||
static int show_otp(struct seq_file *s, void *v)
|
||||
{
|
||||
struct ab3100_otp *otp = s->private;
|
||||
int err;
|
||||
|
||||
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_otp_show, 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 err;
|
||||
}
|
||||
}
|
||||
|
||||
static void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp)
|
||||
{
|
||||
debugfs_remove_file(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 = kzalloc(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 */
|
||||
otp->ab3100 = platform_get_drvdata(pdev);
|
||||
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 out_no_sysfs;
|
||||
}
|
||||
|
||||
/* debugfs entries */
|
||||
err = ab3100_otp_init_debugfs(&pdev->dev, otp);
|
||||
if (err)
|
||||
goto out_no_debugfs;
|
||||
|
||||
return 0;
|
||||
|
||||
out_no_sysfs:
|
||||
for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++)
|
||||
device_remove_file(&pdev->dev,
|
||||
&ab3100_otp_attrs[i]);
|
||||
out_no_debugfs:
|
||||
kfree(otp);
|
||||
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);
|
||||
kfree(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@stericsson.com>");
|
||||
MODULE_DESCRIPTION("AB3100 OTP Readout Driver");
|
||||
MODULE_LICENSE("GPL");
|
Loading…
Reference in a new issue