2019-05-28 16:57:21 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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2009-08-18 20:52:26 +00:00
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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 <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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
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#include <linux/slab.h>
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2009-08-18 20:52:26 +00:00
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#include <linux/init.h>
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#include <linux/platform_device.h>
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2010-05-01 16:26:07 +00:00
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#include <linux/mfd/abx500.h>
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2009-08-18 20:52:26 +00:00
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#include <linux/debugfs.h>
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2010-01-17 19:57:43 +00:00
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#include <linux/seq_file.h>
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2009-08-18 20:52:26 +00:00
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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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2020-06-24 12:17:01 +00:00
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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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2009-08-18 20:52:26 +00:00
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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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2020-06-24 12:17:01 +00:00
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* @freq: clocking frequency for the OTP, this frequency is either
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2009-08-18 20:52:26 +00:00
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* 32768Hz or 1MHz/30
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2020-06-24 12:17:01 +00:00
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* @paf: product activation flag, indicates whether this is a real
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2009-08-18 20:52:26 +00:00
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* product (paf true) or a lab board etc (paf false)
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2020-06-24 12:17:01 +00:00
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* @imeich: if this is set it is possible to override the
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2009-08-18 20:52:26 +00:00
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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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2020-06-24 12:17:01 +00:00
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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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2009-08-18 20:52:26 +00:00
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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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2010-05-01 16:26:20 +00:00
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err = abx500_get_register_interruptible(otp->dev, 0,
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AB3100_OTPP, &otpp);
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2009-08-18 20:52:26 +00:00
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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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2010-05-01 16:26:20 +00:00
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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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2009-08-18 20:52:26 +00:00
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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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2010-01-17 19:57:43 +00:00
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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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2009-08-18 20:52:26 +00:00
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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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2010-01-17 19:57:43 +00:00
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return single_open(file, ab3100_show_otp, inode->i_private);
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2009-08-18 20:52:26 +00:00
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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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2019-07-06 16:47:20 +00:00
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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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2009-08-18 20:52:26 +00:00
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{
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otp->debugfs = debugfs_create_file("ab3100_otp", S_IFREG | S_IRUGO,
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2019-07-06 16:47:20 +00:00
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NULL, otp, &ab3100_otp_operations);
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2009-08-18 20:52:26 +00:00
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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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2010-01-17 19:57:43 +00:00
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debugfs_remove(otp->debugfs);
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2009-08-18 20:52:26 +00:00
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}
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#else
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/* Compile this out if debugfs not selected */
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2019-07-06 16:47:20 +00:00
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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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2009-08-18 20:52:26 +00:00
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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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2013-05-23 15:25:04 +00:00
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otp = devm_kzalloc(&pdev->dev, sizeof(struct ab3100_otp), GFP_KERNEL);
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2015-10-28 09:08:22 +00:00
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if (!otp)
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2009-08-18 20:52:26 +00:00
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return -ENOMEM;
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2015-10-28 09:08:22 +00:00
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2009-08-18 20:52:26 +00:00
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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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2013-05-23 15:25:04 +00:00
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return err;
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2009-08-18 20:52:26 +00:00
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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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2013-05-23 15:25:04 +00:00
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goto err;
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2009-08-18 20:52:26 +00:00
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}
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/* debugfs entries */
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2019-07-06 16:47:20 +00:00
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ab3100_otp_init_debugfs(&pdev->dev, otp);
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2009-08-18 20:52:26 +00:00
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return 0;
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2013-05-23 15:25:04 +00:00
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err:
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2010-05-25 06:49:51 +00:00
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while (--i >= 0)
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device_remove_file(&pdev->dev, &ab3100_otp_attrs[i]);
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2009-08-18 20:52:26 +00:00
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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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2013-03-05 04:47:06 +00:00
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module_platform_driver_probe(ab3100_otp_driver, ab3100_otp_probe);
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2009-08-18 20:52:26 +00:00
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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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